externals: Update fmt to 8.1.1

Merge commit '6633089a44b13022ddb37a44229c9d9a88a9096f'

externals/fmt/.github/workflows/doc.yml

@@ -12,6 +12,7 @@ jobs:
 
     - name: Create Build Environment
       run: |
+        sudo apt update
         sudo apt install doxygen python3-virtualenv
         sudo npm install -g less clean-css
         cmake -E make_directory ${{runner.workspace}}/build

externals/fmt/.github/workflows/linux.yml

@@ -24,10 +24,11 @@ jobs:
             build_type: Debug
             std: 17
             os: ubuntu-18.04
-          - cxx: g++-10
+          - cxx: g++-11
             build_type: Debug
             std: 20
             os: ubuntu-20.04
+            install: sudo apt install g++-11
           - cxx: clang++-9
             build_type: Debug
             fuzz: -DFMT_FUZZ=ON -DFMT_FUZZ_LINKMAIN=ON

externals/fmt/CMakeLists.txt

@@ -17,7 +17,7 @@ endif ()
 
 # Joins arguments and places the results in ${result_var}.
 function(join result_var)
-  set(result )
+  set(result "")
   foreach (arg ${ARGN})
     set(result "${result}${arg}")
   endforeach ()
@@ -81,12 +81,13 @@ option(FMT_FUZZ "Generate the fuzz target." OFF)
 option(FMT_CUDA_TEST "Generate the cuda-test target." OFF)
 option(FMT_OS "Include core requiring OS (Windows/Posix) " ON)
 option(FMT_MODULE "Build a module instead of a traditional library." OFF)
+option(FMT_SYSTEM_HEADERS "Expose headers with marking them as system." OFF)
 
 set(FMT_CAN_MODULE OFF)
 if (CMAKE_CXX_STANDARD GREATER 17 AND
     # msvc 16.10-pre4
     MSVC AND CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 19.29.30035)
-  set(FMT_CAN_MODULE ON)
+  set(FMT_CAN_MODULE OFF)
 endif ()
 if (NOT FMT_CAN_MODULE)
   set(FMT_MODULE OFF)
@@ -96,6 +97,10 @@ if (FMT_TEST AND FMT_MODULE)
   # The tests require {fmt} to be compiled as traditional library
   message(STATUS "Testing is incompatible with build mode 'module'.")
 endif ()
+set(FMT_SYSTEM_HEADERS_ATTRIBUTE "")
+if (FMT_SYSTEM_HEADERS)
+  set(FMT_SYSTEM_HEADERS_ATTRIBUTE SYSTEM)
+endif ()
 
 # Get version from core.h
 file(READ include/fmt/core.h core_h)
@@ -151,7 +156,7 @@ if (CMAKE_CXX_COMPILER_ID MATCHES "GNU")
       -Wcast-align
       -Wctor-dtor-privacy -Wdisabled-optimization
       -Winvalid-pch -Woverloaded-virtual
-      -Wconversion -Wswitch-enum -Wundef
+      -Wconversion -Wundef
       -Wno-ctor-dtor-privacy -Wno-format-nonliteral)
   if (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.6)
       set(PEDANTIC_COMPILE_FLAGS ${PEDANTIC_COMPILE_FLAGS}
@@ -244,7 +249,7 @@ if (HAVE_STRTOD_L)
 endif ()
 
 if (MINGW)
-  check_cxx_compiler_flag("Wa,-mbig-obj" FMT_HAS_MBIG_OBJ)
+  check_cxx_compiler_flag("-Wa,-mbig-obj" FMT_HAS_MBIG_OBJ)
   if (${FMT_HAS_MBIG_OBJ})
     target_compile_options(fmt PUBLIC "-Wa,-mbig-obj")
   endif()
@@ -262,7 +267,7 @@ endif ()
 
 target_compile_features(fmt INTERFACE ${FMT_REQUIRED_FEATURES})
 
-target_include_directories(fmt PUBLIC
+target_include_directories(fmt ${FMT_SYSTEM_HEADERS_ATTRIBUTE} PUBLIC
   $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/include>
   $<INSTALL_INTERFACE:${FMT_INC_DIR}>)
 
@@ -298,7 +303,7 @@ add_library(fmt::fmt-header-only ALIAS fmt-header-only)
 target_compile_definitions(fmt-header-only INTERFACE FMT_HEADER_ONLY=1)
 target_compile_features(fmt-header-only INTERFACE ${FMT_REQUIRED_FEATURES})
 
-target_include_directories(fmt-header-only INTERFACE
+target_include_directories(fmt-header-only ${FMT_SYSTEM_HEADERS_ATTRIBUTE} INTERFACE
   $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/include>
   $<INSTALL_INTERFACE:${FMT_INC_DIR}>)
 

externals/fmt/ChangeLog.rst

@@ -1,7 +1,427 @@
+8.1.1 - 2022-01-06
+------------------
+
+* Restored ABI compatibility with version 8.0.x
+  (`#2695 <https://github.com/fmtlib/fmt/issues/2695>`_,
+  `#2696 <https://github.com/fmtlib/fmt/pull/2696>`_).
+  Thanks `@saraedum (Julian Rüth) <https://github.com/saraedum>`_.
+
+* Fixed chorno formatting on big endian systems
+  (`#2698 <https://github.com/fmtlib/fmt/issues/2698>`_,
+  `#2699 <https://github.com/fmtlib/fmt/pull/2699>`_).
+  Thanks `@phprus (Vladislav Shchapov) <https://github.com/phprus>`_ and
+  `@xvitaly (Vitaly Zaitsev) <https://github.com/xvitaly>`_.
+
+* Fixed a linkage error with mingw
+  (`#2691 <https://github.com/fmtlib/fmt/issues/2691>`_,
+  `#2692 <https://github.com/fmtlib/fmt/pull/2692>`_).
+  Thanks `@rbberger (Richard Berger) <https://github.com/rbberger>`_.
+
+8.1.0 - 2022-01-02
+------------------
+
+* Optimized chrono formatting
+  (`#2500 <https://github.com/fmtlib/fmt/pull/2500>`_,
+  `#2537 <https://github.com/fmtlib/fmt/pull/2537>`_,
+  `#2541 <https://github.com/fmtlib/fmt/issues/2541>`_,
+  `#2544 <https://github.com/fmtlib/fmt/pull/2544>`_,
+  `#2550 <https://github.com/fmtlib/fmt/pull/2550>`_,
+  `#2551 <https://github.com/fmtlib/fmt/pull/2551>`_,
+  `#2576 <https://github.com/fmtlib/fmt/pull/2576>`_,
+  `#2577 <https://github.com/fmtlib/fmt/issues/2577>`_,
+  `#2586 <https://github.com/fmtlib/fmt/pull/2586>`_,
+  `#2591 <https://github.com/fmtlib/fmt/pull/2591>`_,
+  `#2594 <https://github.com/fmtlib/fmt/pull/2594>`_,
+  `#2602 <https://github.com/fmtlib/fmt/pull/2602>`_,
+  `#2617 <https://github.com/fmtlib/fmt/pull/2617>`_,
+  `#2628 <https://github.com/fmtlib/fmt/issues/2628>`_,
+  `#2633 <https://github.com/fmtlib/fmt/pull/2633>`_,
+  `#2670 <https://github.com/fmtlib/fmt/issues/2670>`_,
+  `#2671 <https://github.com/fmtlib/fmt/pull/2671>`_).
+
+  Processing of some specifiers such as ``%z`` and ``%Y`` is now up to 10-20
+  times faster, for example on GCC 11 with libstdc++::
+
+    ----------------------------------------------------------------------------
+    Benchmark                                  Before             After
+    ----------------------------------------------------------------------------
+    FMTFormatter_z                             261 ns             26.3 ns
+    FMTFormatterCompile_z                      246 ns             11.6 ns
+    FMTFormatter_Y                             263 ns             26.1 ns
+    FMTFormatterCompile_Y                      244 ns             10.5 ns
+    ----------------------------------------------------------------------------
+
+  Thanks `@phprus (Vladislav Shchapov) <https://github.com/phprus>`_ and
+  `@toughengineer (Pavel Novikov) <https://github.com/toughengineer>`_.
+
+* Implemented subsecond formatting for chrono durations
+  (`#2623 <https://github.com/fmtlib/fmt/pull/2623>`_).
+  For example (`godbolt <https://godbolt.org/z/es7vWTETe>`__):
+
+  .. code:: c++
+
+     #include <fmt/chrono.h>
+
+     int main() {
+       fmt::print("{:%S}", std::chrono::milliseconds(1234));
+     }
+
+  prints "01.234".
+
+  Thanks `@matrackif <https://github.com/matrackif>`_.
+
+* Fixed handling of precision 0 when formatting chrono durations
+  (`#2587 <https://github.com/fmtlib/fmt/issues/2587>`_,
+  `#2588 <https://github.com/fmtlib/fmt/pull/2588>`_).
+  Thanks `@lukester1975 <https://github.com/lukester1975>`_.
+
+* Fixed an overflow on invalid inputs in the ``tm`` formatter
+  (`#2564 <https://github.com/fmtlib/fmt/pull/2564>`_).
+  Thanks `@phprus (Vladislav Shchapov) <https://github.com/phprus>`_.
+
+* Added ``fmt::group_digits`` that formats integers with a non-localized digit
+  separator (comma) for groups of three digits.
+  For example (`godbolt <https://godbolt.org/z/TxGxG9Poq>`__):
+
+  .. code:: c++
+
+     #include <fmt/format.h>
+
+     int main() {
+       fmt::print("{} dollars", fmt::group_digits(1000000));
+     }
+
+  prints "1,000,000 dollars".
+
+* Added support for faint, conceal, reverse and blink text styles
+  (`#2394 <https://github.com/fmtlib/fmt/pull/2394>`_):
+
+  https://user-images.githubusercontent.com/576385/147710227-c68f5317-f8fa-42c3-9123-7c4ba3c398cb.mp4
+
+  Thanks `@benit8 (Benoît Lormeau) <https://github.com/benit8>`_ and
+  `@data-man (Dmitry Atamanov) <https://github.com/data-man>`_.
+
+* Added experimental support for compile-time floating point formatting
+  (`#2426 <https://github.com/fmtlib/fmt/pull/2426>`_,
+  `#2470 <https://github.com/fmtlib/fmt/pull/2470>`_).
+  It is currently limited to the header-only mode.
+  Thanks `@alexezeder (Alexey Ochapov) <https://github.com/alexezeder>`_.
+
+* Added UDL-based named argument support to compile-time format string checks
+  (`#2640 <https://github.com/fmtlib/fmt/issues/2640>`_,
+  `#2649 <https://github.com/fmtlib/fmt/pull/2649>`_).
+  For example (`godbolt <https://godbolt.org/z/ohGbbvonv>`__):
+
+  .. code:: c++
+
+     #include <fmt/format.h>
+
+     int main() {
+       using namespace fmt::literals;
+       fmt::print("{answer:s}", "answer"_a=42);
+     }
+
+  gives a compile-time error on compilers with C++20 ``consteval`` and non-type
+  template parameter support (gcc 10+) because ``s`` is not a valid format
+  specifier for an integer.
+
+  Thanks `@alexezeder (Alexey Ochapov) <https://github.com/alexezeder>`_.
+
+* Implemented escaping of string range elements.
+  For example (`godbolt <https://godbolt.org/z/rKvM1vKf3>`__):
+
+  .. code:: c++
+
+     #include <fmt/ranges.h>
+     #include <vector>
+
+     int main() {
+       fmt::print("{}", std::vector<std::string>{"\naan"});
+     }
+
+  is now printed as::
+
+    ["\naan"]
+
+  instead of::
+  
+    ["
+    aan"]
+
+* Switched to JSON-like representation of maps and sets for consistency with
+  Python's ``str.format``.
+  For example (`godbolt <https://godbolt.org/z/seKjoY9W5>`__):
+
+  .. code:: c++
+
+     #include <fmt/ranges.h>
+     #include <map>
+
+     int main() {
+       fmt::print("{}", std::map<std::string, int>{{"answer", 42}});
+     }
+
+  is now printed as::
+
+    {"answer": 42}
+
+* Extended ``fmt::join`` to support C++20-only ranges
+  (`#2549 <https://github.com/fmtlib/fmt/pull/2549>`_).
+  Thanks `@BRevzin (Barry Revzin) <https://github.com/BRevzin>`_.
+
+* Optimized handling of non-const-iterable ranges and implemented initial
+  support for non-const-formattable types.
+
+* Disabled implicit conversions of scoped enums to integers that was
+  accidentally introduced in earlier versions
+  (`#1841 <https://github.com/fmtlib/fmt/pull/1841>`_).
+
+* Deprecated implicit conversion of ``[const] signed char*`` and 
+  ``[const] unsigned char*`` to C strings.
+
+* Deprecated ``_format``, a legacy UDL-based format API
+  (`#2646 <https://github.com/fmtlib/fmt/pull/2646>`_).
+  Thanks `@alexezeder (Alexey Ochapov) <https://github.com/alexezeder>`_.
+
+* Marked ``format``, ``formatted_size`` and ``to_string`` as ``[[nodiscard]]``
+  (`#2612 <https://github.com/fmtlib/fmt/pull/2612>`_).
+  `@0x8000-0000 (Florin Iucha) <https://github.com/0x8000-0000>`_.
+
+* Added missing diagnostic when trying to format function and member pointers
+  as well as objects convertible to pointers which is explicitly disallowed
+  (`#2598 <https://github.com/fmtlib/fmt/issues/2598>`_,
+  `#2609 <https://github.com/fmtlib/fmt/pull/2609>`_,
+  `#2610 <https://github.com/fmtlib/fmt/pull/2610>`_).
+  Thanks `@AlexGuteniev (Alex Guteniev) <https://github.com/AlexGuteniev>`_.
+
+* Optimized writing to a contiguous buffer with ``format_to_n``
+  (`#2489 <https://github.com/fmtlib/fmt/pull/2489>`_).
+  Thanks `@Roman-Koshelev <https://github.com/Roman-Koshelev>`_.
+
+* Optimized writing to non-``char`` buffers
+  (`#2477 <https://github.com/fmtlib/fmt/pull/2477>`_).
+  Thanks `@Roman-Koshelev <https://github.com/Roman-Koshelev>`_.
+
+* Decimal point is now localized when using the ``L`` specifier.
+
+* Improved floating point formatter implementation
+  (`#2498 <https://github.com/fmtlib/fmt/pull/2498>`_,
+  `#2499 <https://github.com/fmtlib/fmt/pull/2499>`_).
+  Thanks `@Roman-Koshelev <https://github.com/Roman-Koshelev>`_.
+
+* Fixed handling of very large precision in fixed format
+  (`#2616 <https://github.com/fmtlib/fmt/pull/2616>`_).
+
+* Made a table of cached powers used in FP formatting static
+  (`#2509 <https://github.com/fmtlib/fmt/pull/2509>`_).
+  Thanks `@jk-jeon (Junekey Jeon) <https://github.com/jk-jeon>`_.
+
+* Resolved a lookup ambiguity with C++20 format-related functions due to ADL
+  (`#2639 <https://github.com/fmtlib/fmt/issues/2639>`_,
+  `#2641 <https://github.com/fmtlib/fmt/pull/2641>`_).
+  Thanks `@mkurdej (Marek Kurdej) <https://github.com/mkurdej>`_.
+
+* Removed unnecessary inline namespace qualification
+  (`#2642 <https://github.com/fmtlib/fmt/issues/2642>`_,
+  `#2643 <https://github.com/fmtlib/fmt/pull/2643>`_).
+  Thanks `@mkurdej (Marek Kurdej) <https://github.com/mkurdej>`_.
+
+* Implemented argument forwarding in ``format_to_n``
+  (`#2462 <https://github.com/fmtlib/fmt/issues/2462>`_,
+  `#2463 <https://github.com/fmtlib/fmt/pull/2463>`_).
+  Thanks `@owent (WenTao Ou) <https://github.com/owent>`_.
+
+* Fixed handling of implicit conversions in ``fmt::to_string`` and format string
+  compilation (`#2565 <https://github.com/fmtlib/fmt/issues/2565>`_).
+
+* Changed the default access mode of files created by ``fmt::output_file`` to
+  ``-rw-r--r--`` for consistency with ``fopen``
+  (`#2530 <https://github.com/fmtlib/fmt/issues/2530>`_).
+
+* Make ``fmt::ostream::flush`` public
+  (`#2435 <https://github.com/fmtlib/fmt/issues/2435>`_).
+
+* Improved C++14/17 attribute detection
+  (`#2615 <https://github.com/fmtlib/fmt/pull/2615>`_).
+  Thanks `@AlexGuteniev (Alex Guteniev) <https://github.com/AlexGuteniev>`_.
+
+* Improved ``consteval`` detection for MSVC
+  (`#2559 <https://github.com/fmtlib/fmt/pull/2559>`_).
+  Thanks `@DanielaE (Daniela Engert) <https://github.com/DanielaE>`_.
+
+* Improved documentation
+  (`#2406 <https://github.com/fmtlib/fmt/issues/2406>`_,
+  `#2446 <https://github.com/fmtlib/fmt/pull/2446>`_,
+  `#2493 <https://github.com/fmtlib/fmt/issues/2493>`_,
+  `#2513 <https://github.com/fmtlib/fmt/issues/2513>`_,
+  `#2515 <https://github.com/fmtlib/fmt/pull/2515>`_,
+  `#2522 <https://github.com/fmtlib/fmt/issues/2522>`_,
+  `#2562 <https://github.com/fmtlib/fmt/pull/2562>`_,
+  `#2575 <https://github.com/fmtlib/fmt/pull/2575>`_,
+  `#2606 <https://github.com/fmtlib/fmt/pull/2606>`_,
+  `#2620 <https://github.com/fmtlib/fmt/pull/2620>`_,
+  `#2676 <https://github.com/fmtlib/fmt/issues/2676>`_).
+  Thanks `@sobolevn (Nikita Sobolev) <https://github.com/sobolevn>`_,
+  `@UnePierre (Max FERGER) <https://github.com/UnePierre>`_,
+  `@zhsj <https://github.com/zhsj>`_,
+  `@phprus (Vladislav Shchapov) <https://github.com/phprus>`_,
+  `@ericcurtin (Eric Curtin) <https://github.com/ericcurtin>`_,
+  `@Lounarok <https://github.com/Lounarok>`_.
+
+* Improved fuzzers and added a fuzzer for chrono timepoint formatting
+  (`#2461 <https://github.com/fmtlib/fmt/pull/2461>`_,
+  `#2469 <https://github.com/fmtlib/fmt/pull/2469>`_).
+  `@pauldreik (Paul Dreik) <https://github.com/pauldreik>`_,
+
+* Added the ``FMT_SYSTEM_HEADERS`` CMake option setting which marks {fmt}'s
+  headers as system. It can be used to suppress warnings
+  (`#2644 <https://github.com/fmtlib/fmt/issues/2644>`_,
+  `#2651 <https://github.com/fmtlib/fmt/pull/2651>`_).
+  Thanks `@alexezeder (Alexey Ochapov) <https://github.com/alexezeder>`_.
+
+* Added the Bazel build system support
+  (`#2505 <https://github.com/fmtlib/fmt/pull/2505>`_,
+  `#2516 <https://github.com/fmtlib/fmt/pull/2516>`_).
+  Thanks `@Vertexwahn <https://github.com/Vertexwahn>`_.
+
+* Improved build configuration and tests
+  (`#2437 <https://github.com/fmtlib/fmt/issues/2437>`_,
+  `#2558 <https://github.com/fmtlib/fmt/pull/2558>`_,
+  `#2648 <https://github.com/fmtlib/fmt/pull/2648>`_,
+  `#2650 <https://github.com/fmtlib/fmt/pull/2650>`_,
+  `#2663 <https://github.com/fmtlib/fmt/pull/2663>`_,
+  `#2677 <https://github.com/fmtlib/fmt/pull/2677>`_).
+  Thanks `@DanielaE (Daniela Engert) <https://github.com/DanielaE>`_,
+  `@alexezeder (Alexey Ochapov) <https://github.com/alexezeder>`_,
+  `@phprus (Vladislav Shchapov) <https://github.com/phprus>`_.
+
+* Fixed various warnings and compilation issues
+  (`#2353 <https://github.com/fmtlib/fmt/pull/2353>`_,
+  `#2356 <https://github.com/fmtlib/fmt/pull/2356>`_,
+  `#2399 <https://github.com/fmtlib/fmt/pull/2399>`_,
+  `#2408 <https://github.com/fmtlib/fmt/issues/2408>`_,
+  `#2414 <https://github.com/fmtlib/fmt/pull/2414>`_,
+  `#2427 <https://github.com/fmtlib/fmt/pull/2427>`_,
+  `#2432 <https://github.com/fmtlib/fmt/pull/2432>`_,
+  `#2442 <https://github.com/fmtlib/fmt/pull/2442>`_,
+  `#2434 <https://github.com/fmtlib/fmt/pull/2434>`_,
+  `#2439 <https://github.com/fmtlib/fmt/issues/2439>`_,
+  `#2447 <https://github.com/fmtlib/fmt/pull/2447>`_,
+  `#2450 <https://github.com/fmtlib/fmt/pull/2450>`_,
+  `#2455 <https://github.com/fmtlib/fmt/issues/2455>`_,
+  `#2465 <https://github.com/fmtlib/fmt/issues/2465>`_,
+  `#2472 <https://github.com/fmtlib/fmt/issues/2472>`_,
+  `#2474 <https://github.com/fmtlib/fmt/issues/2474>`_,
+  `#2476 <https://github.com/fmtlib/fmt/pull/2476>`_,
+  `#2478 <https://github.com/fmtlib/fmt/issues/2478>`_,
+  `#2479 <https://github.com/fmtlib/fmt/issues/2479>`_,
+  `#2481 <https://github.com/fmtlib/fmt/issues/2481>`_,
+  `#2482 <https://github.com/fmtlib/fmt/pull/2482>`_,
+  `#2483 <https://github.com/fmtlib/fmt/pull/2483>`_,
+  `#2490 <https://github.com/fmtlib/fmt/issues/2490>`_,
+  `#2491 <https://github.com/fmtlib/fmt/pull/2491>`_,
+  `#2510 <https://github.com/fmtlib/fmt/pull/2510>`_,
+  `#2518 <https://github.com/fmtlib/fmt/pull/2518>`_,
+  `#2528 <https://github.com/fmtlib/fmt/issues/2528>`_,
+  `#2529 <https://github.com/fmtlib/fmt/pull/2529>`_,
+  `#2539 <https://github.com/fmtlib/fmt/pull/2539>`_,
+  `#2540 <https://github.com/fmtlib/fmt/issues/2540>`_,
+  `#2545 <https://github.com/fmtlib/fmt/pull/2545>`_,
+  `#2555 <https://github.com/fmtlib/fmt/pull/2555>`_,
+  `#2557 <https://github.com/fmtlib/fmt/issues/2557>`_,
+  `#2570 <https://github.com/fmtlib/fmt/issues/2570>`_,
+  `#2573 <https://github.com/fmtlib/fmt/pull/2573>`_,
+  `#2582 <https://github.com/fmtlib/fmt/pull/2582>`_,
+  `#2605 <https://github.com/fmtlib/fmt/issues/2605>`_,
+  `#2611 <https://github.com/fmtlib/fmt/pull/2611>`_,
+  `#2647 <https://github.com/fmtlib/fmt/pull/2647>`_,
+  `#2627 <https://github.com/fmtlib/fmt/issues/2627>`_,
+  `#2630 <https://github.com/fmtlib/fmt/pull/2630>`_,
+  `#2635 <https://github.com/fmtlib/fmt/issues/2635>`_,
+  `#2638 <https://github.com/fmtlib/fmt/issues/2638>`_,
+  `#2653 <https://github.com/fmtlib/fmt/issues/2653>`_,
+  `#2654 <https://github.com/fmtlib/fmt/issues/2654>`_,
+  `#2661 <https://github.com/fmtlib/fmt/issues/2661>`_,
+  `#2664 <https://github.com/fmtlib/fmt/pull/2664>`_,
+  `#2684 <https://github.com/fmtlib/fmt/pull/2684>`_).
+  Thanks `@DanielaE (Daniela Engert) <https://github.com/DanielaE>`_,
+  `@mwinterb <https://github.com/mwinterb>`_,
+  `@cdacamar (Cameron DaCamara) <https://github.com/cdacamar>`_,
+  `@TrebledJ (Johnathan) <https://github.com/TrebledJ>`_,
+  `@bodomartin (brm) <https://github.com/bodomartin>`_,
+  `@cquammen (Cory Quammen) <https://github.com/cquammen>`_,
+  `@white238 (Chris White) <https://github.com/white238>`_,
+  `@mmarkeloff (Max) <https://github.com/mmarkeloff>`_,
+  `@palacaze (Pierre-Antoine Lacaze) <https://github.com/palacaze>`_,
+  `@jcelerier (Jean-Michaël Celerier) <https://github.com/jcelerier>`_,
+  `@mborn-adi (Mathias Born) <https://github.com/mborn-adi>`_,
+  `@BrukerJWD (Jonathan W) <https://github.com/BrukerJWD>`_,
+  `@spyridon97 (Spiros Tsalikis) <https://github.com/spyridon97>`_,
+  `@phprus (Vladislav Shchapov) <https://github.com/phprus>`_,
+  `@oliverlee (Oliver Lee) <https://github.com/oliverlee>`_,
+  `@joshessman-llnl (Josh Essman) <https://github.com/joshessman-llnl>`_,
+  `@akohlmey (Axel Kohlmeyer) <https://github.com/akohlmey>`_,
+  `@timkalu <https://github.com/timkalu>`_,
+  `@olupton (Olli Lupton) <https://github.com/olupton>`_,
+  `@Acretock <https://github.com/Acretock>`_,
+  `@alexezeder (Alexey Ochapov) <https://github.com/alexezeder>`_,
+  `@andrewcorrigan (Andrew Corrigan) <https://github.com/andrewcorrigan>`_,
+  `@lucpelletier <https://github.com/lucpelletier>`_,
+  `@HazardyKnusperkeks (Björn Schäpers) <https://github.com/HazardyKnusperkeks>`_.
+
+8.0.1 - 2021-07-02
+------------------
+
+* Fixed the version number in the inline namespace
+  (`#2374 <https://github.com/fmtlib/fmt/issues/2374>`_).
+
+* Added a missing presentation type check for ``std::string``
+  (`#2402 <https://github.com/fmtlib/fmt/issues/2402>`_).
+
+* Fixed a linkage error when mixing code built with clang and gcc
+  (`#2377 <https://github.com/fmtlib/fmt/issues/2377>`_).
+
+* Fixed documentation issues
+  (`#2396 <https://github.com/fmtlib/fmt/pull/2396>`_,
+  `#2403 <https://github.com/fmtlib/fmt/issues/2403>`_,
+  `#2406 <https://github.com/fmtlib/fmt/issues/2406>`_).
+  Thanks `@mkurdej (Marek Kurdej) <https://github.com/mkurdej>`_.
+
+* Removed dead code in FP formatter (
+  `#2398 <https://github.com/fmtlib/fmt/pull/2398>`_).
+  Thanks `@javierhonduco (Javier Honduvilla Coto)
+  <https://github.com/javierhonduco>`_.
+
+* Fixed various warnings and compilation issues
+  (`#2351 <https://github.com/fmtlib/fmt/issues/2351>`_,
+  `#2359 <https://github.com/fmtlib/fmt/issues/2359>`_,
+  `#2365 <https://github.com/fmtlib/fmt/pull/2365>`_,
+  `#2368 <https://github.com/fmtlib/fmt/issues/2368>`_,
+  `#2370 <https://github.com/fmtlib/fmt/pull/2370>`_,
+  `#2376 <https://github.com/fmtlib/fmt/pull/2376>`_,
+  `#2381 <https://github.com/fmtlib/fmt/pull/2381>`_,
+  `#2382 <https://github.com/fmtlib/fmt/pull/2382>`_,
+  `#2386 <https://github.com/fmtlib/fmt/issues/2386>`_,
+  `#2389 <https://github.com/fmtlib/fmt/pull/2389>`_,
+  `#2395 <https://github.com/fmtlib/fmt/pull/2395>`_,
+  `#2397 <https://github.com/fmtlib/fmt/pull/2397>`_,
+  `#2400 <https://github.com/fmtlib/fmt/issues/2400>`_,
+  `#2401 <https://github.com/fmtlib/fmt/issues/2401>`_,
+  `#2407 <https://github.com/fmtlib/fmt/pull/2407>`_).
+  Thanks `@zx2c4 (Jason A. Donenfeld) <https://github.com/zx2c4>`_,
+  `@AidanSun05 (Aidan Sun) <https://github.com/AidanSun05>`_,
+  `@mattiasljungstrom (Mattias Ljungström)
+  <https://github.com/mattiasljungstrom>`_,
+  `@joemmett (Jonathan Emmett) <https://github.com/joemmett>`_,
+  `@erengy (Eren Okka) <https://github.com/erengy>`_,
+  `@patlkli (Patrick Geltinger) <https://github.com/patlkli>`_,
+  `@gsjaardema (Greg Sjaardema) <https://github.com/gsjaardema>`_,
+  `@phprus (Vladislav Shchapov) <https://github.com/phprus>`_.
+
 8.0.0 - 2021-06-21
 ------------------
 
-* Enabled compile-time format string check by default.
+* Enabled compile-time format string checks by default.
   For example (`godbolt <https://godbolt.org/z/sMxcohGjz>`__):
 
   .. code:: c++
@@ -232,6 +652,9 @@
   This doesn't introduce a dependency on ``<locale>`` so there is virtually no
   compile time effect.
 
+* Deprecated an undocumented ``format_to`` overload that takes
+  ``basic_memory_buffer``.
+
 * Made parameter order in ``vformat_to`` consistent with ``format_to``
   (`#2327 <https://github.com/fmtlib/fmt/issues/2327>`_).
 
@@ -301,9 +724,9 @@
   ``make_format_to_n_args``. They have been replaced with ``format_context``,
   ``format_args` and ``make_format_args`` respectively.
 
-* Moved ``wchar_t``-specific functions and types to ``fmt/wchar.h``.
-  You can define ``FMT_DEPRECATED_INCLUDE_WCHAR`` to automatically include
-  ``fmt/wchar.h`` from ``fmt/format.h`` but this will be disabled in the next
+* Moved ``wchar_t``-specific functions and types to ``fmt/xchar.h``.
+  You can define ``FMT_DEPRECATED_INCLUDE_XCHAR`` to automatically include
+  ``fmt/xchar.h`` from ``fmt/format.h`` but this will be disabled in the next
   major release.
 
 * Fixed handling of the ``'+'`` specifier in localized formatting
@@ -338,6 +761,9 @@
 
   Thanks `@mikecrowe (Mike Crowe) <https://github.com/mikecrowe>`_.
 
+* The undocumented support for specializing ``formatter`` for pointer types
+  has been removed.
+
 * Fixed ``fmt::formatted_size`` with format string compilation
   (`#2141 <https://github.com/fmtlib/fmt/pull/2141>`_,
   `#2161 <https://github.com/fmtlib/fmt/pull/2161>`_).
@@ -510,13 +936,13 @@
   `#2067 <https://github.com/fmtlib/fmt/pull/2067>`_,
   `#2068 <https://github.com/fmtlib/fmt/pull/2068>`_,
   `#2073 <https://github.com/fmtlib/fmt/pull/2073>`_,
-  `#2103 <https://github.com/fmtlib/fmt/issues/2103>`_
-  `#2105 <https://github.com/fmtlib/fmt/issues/2105>`_
+  `#2103 <https://github.com/fmtlib/fmt/issues/2103>`_,
+  `#2105 <https://github.com/fmtlib/fmt/issues/2105>`_,
   `#2106 <https://github.com/fmtlib/fmt/pull/2106>`_,
   `#2107 <https://github.com/fmtlib/fmt/pull/2107>`_,
-  `#2116 <https://github.com/fmtlib/fmt/issues/2116>`_
+  `#2116 <https://github.com/fmtlib/fmt/issues/2116>`_,
   `#2117 <https://github.com/fmtlib/fmt/pull/2117>`_,
-  `#2118 <https://github.com/fmtlib/fmt/issues/2118>`_
+  `#2118 <https://github.com/fmtlib/fmt/issues/2118>`_,
   `#2119 <https://github.com/fmtlib/fmt/pull/2119>`_,
   `#2127 <https://github.com/fmtlib/fmt/issues/2127>`_,
   `#2128 <https://github.com/fmtlib/fmt/pull/2128>`_,
@@ -589,7 +1015,7 @@
   `@yeswalrus (Walter Gray) <https://github.com/yeswalrus>`_,
   `@Finkman <https://github.com/Finkman>`_,
   `@HazardyKnusperkeks (Björn Schäpers) <https://github.com/HazardyKnusperkeks>`_,
-  `@dkavolis (Daumantas Kavolis) <https://github.com/dkavolis>`_
+  `@dkavolis (Daumantas Kavolis) <https://github.com/dkavolis>`_,
   `@concatime (Issam Maghni) <https://github.com/concatime>`_,
   `@chronoxor (Ivan Shynkarenka) <https://github.com/chronoxor>`_,
   `@summivox (Yin Zhong) <https://github.com/summivox>`_,
@@ -1046,7 +1472,7 @@
   `#1912 <https://github.com/fmtlib/fmt/issues/1912>`_,
   `#1928 <https://github.com/fmtlib/fmt/issues/1928>`_,
   `#1929 <https://github.com/fmtlib/fmt/pull/1929>`_,
-  `#1935 <https://github.com/fmtlib/fmt/issues/1935>`_
+  `#1935 <https://github.com/fmtlib/fmt/issues/1935>`_,
   `#1937 <https://github.com/fmtlib/fmt/pull/1937>`_,
   `#1942 <https://github.com/fmtlib/fmt/pull/1942>`_,
   `#1949 <https://github.com/fmtlib/fmt/issues/1949>`_).

externals/fmt/README.rst

@@ -10,7 +10,7 @@
 .. image:: https://github.com/fmtlib/fmt/workflows/windows/badge.svg
    :target: https://github.com/fmtlib/fmt/actions?query=workflow%3Awindows
 
-.. image:: https://ci.appveyor.com/api/projects/status/ehjkiefde6gucy1v
+.. image:: https://ci.appveyor.com/api/projects/status/ehjkiefde6gucy1v?svg=true
    :target: https://ci.appveyor.com/project/vitaut/fmt
 
 .. image:: https://oss-fuzz-build-logs.storage.googleapis.com/badges/fmt.svg
@@ -143,10 +143,10 @@ Output::
 
 .. code:: c++
 
-    std::string s = fmt::format(FMT_STRING("{:d}"), "I am not a number");
+    std::string s = fmt::format("{:d}", "I am not a number");
 
-This gives a compile-time error because ``d`` is an invalid format specifier for
-a string.
+This gives a compile-time error in C++20 because ``d`` is an invalid format
+specifier for a string.
 
 **Write a file from a single thread**
 
@@ -205,7 +205,7 @@ The above results were generated by building ``tinyformat_test.cpp`` on macOS
 best of three runs. In the test, the format string ``"%0.10f:%04d:%+g:%s:%p:%c:%%\n"``
 or equivalent is filled 2,000,000 times with output sent to ``/dev/null``; for
 further details refer to the `source
-<https://github.com/fmtlib/format-benchmark/blob/master/tinyformat_test.cpp>`_.
+<https://github.com/fmtlib/format-benchmark/blob/master/src/tinyformat-test.cc>`_.
 
 {fmt} is up to 20-30x faster than ``std::ostringstream`` and ``sprintf`` on
 floating-point formatting (`dtoa-benchmark <https://github.com/fmtlib/dtoa-benchmark>`_)
@@ -469,7 +469,7 @@ Boost Format
 
 This is a very powerful library which supports both ``printf``-like format
 strings and positional arguments. Its main drawback is performance. According to
-various, benchmarks it is much slower than other methods considered here. Boost
+various benchmarks, it is much slower than other methods considered here. Boost
 Format also has excessive build times and severe code bloat issues (see
 `Benchmarks`_).
 

externals/fmt/doc/api.rst

@@ -37,10 +37,12 @@ similar to that of Python's `str.format
 <https://docs.python.org/3/library/stdtypes.html#str.format>`_.
 They take *fmt* and *args* as arguments.
 
-*fmt* is a format string that contains literal text and replacement
-fields surrounded by braces ``{}``. The fields are replaced with formatted
-arguments in the resulting string. A function taking *fmt* doesn't
-participate in an overload resolution if the latter is not a string.
+*fmt* is a format string that contains literal text and replacement fields
+surrounded by braces ``{}``. The fields are replaced with formatted arguments
+in the resulting string. `~fmt::format_string` is a format string which can be
+implicitly constructed from a string literal or a ``constexpr`` string and is
+checked at compile time in C++20. To pass a runtime format string wrap it in
+`fmt::runtime`.
 
 *args* is an argument list representing objects to be formatted.
 
@@ -50,7 +52,7 @@ participate in an overload resolution if the latter is not a string.
 .. doxygenfunction:: vformat(string_view fmt, format_args args) -> std::string
 
 .. doxygenfunction:: format_to(OutputIt out, format_string<T...> fmt, T&&... args) -> OutputIt
-.. doxygenfunction:: format_to_n(OutputIt out, size_t n, format_string<T...> fmt, const T&... args) -> format_to_n_result<OutputIt>
+.. doxygenfunction:: format_to_n(OutputIt out, size_t n, format_string<T...> fmt, T&&... args) -> format_to_n_result<OutputIt>
 .. doxygenfunction:: formatted_size(format_string<T...> fmt, T&&... args) -> size_t
 
 .. doxygenstruct:: fmt::format_to_n_result
@@ -59,7 +61,7 @@ participate in an overload resolution if the latter is not a string.
 .. _print:
 
 .. doxygenfunction:: fmt::print(format_string<T...> fmt, T&&... args)
-.. doxygenfunction:: vprint(string_view fmt, format_args args)
+.. doxygenfunction:: fmt::vprint(string_view fmt, format_args args)
 
 .. doxygenfunction:: print(std::FILE *f, format_string<T...> fmt, T&&... args)
 .. doxygenfunction:: vprint(std::FILE *f, string_view fmt, format_args args)
@@ -70,6 +72,7 @@ Compile-time Format String Checks
 Compile-time checks are enabled when using ``FMT_STRING``. They support built-in
 and string types as well as user-defined types with ``constexpr`` ``parse``
 functions in their ``formatter`` specializations.
+Requires C++14 and is a no-op in C++11.
 
 .. doxygendefine:: FMT_STRING
 
@@ -78,6 +81,13 @@ To force the use of compile-time checks, define the preprocessor variable
 will fail to compile with regular strings. Runtime-checked
 formatting is still possible using ``fmt::vformat``, ``fmt::vprint``, etc.
 
+.. doxygenclass:: fmt::basic_format_string
+   :members:
+
+.. doxygentypedef:: fmt::format_string
+
+.. doxygenfunction:: fmt::runtime(const S&)
+
 Named Arguments
 ---------------
 
@@ -177,7 +187,9 @@ template and implement ``parse`` and ``format`` methods::
 
   #include <fmt/format.h>
 
-  struct point { double x, y; };
+  struct point {
+    double x, y;
+  };
 
   template <> struct fmt::formatter<point> {
     // Presentation format: 'f' - fixed, 'e' - exponential.
@@ -201,8 +213,7 @@ template and implement ``parse`` and ``format`` methods::
       if (it != end && (*it == 'f' || *it == 'e')) presentation = *it++;
 
       // Check if reached the end of the range:
-      if (it != end && *it != '}')
-        throw format_error("invalid format");
+      if (it != end && *it != '}') throw format_error("invalid format");
 
       // Return an iterator past the end of the parsed range:
       return it;
@@ -213,10 +224,9 @@ template and implement ``parse`` and ``format`` methods::
     template <typename FormatContext>
     auto format(const point& p, FormatContext& ctx) -> decltype(ctx.out()) {
       // ctx.out() is an output iterator to write to.
-      return format_to(
-          ctx.out(),
-          presentation == 'f' ? "({:.1f}, {:.1f})" : "({:.1e}, {:.1e})",
-          p.x, p.y);
+      return presentation == 'f'
+                ? format_to(ctx.out(), "({:.1f}, {:.1f})", p.x, p.y)
+                : format_to(ctx.out(), "({:.1e}, {:.1e})", p.x, p.y);
     }
   };
 
@@ -314,6 +324,8 @@ Utilities
 
 .. doxygenfunction:: fmt::join(It begin, Sentinel end, string_view sep) -> join_view<It, Sentinel>
 
+.. doxygenfunction:: fmt::group_digits(T value) -> group_digits_view<T>
+
 .. doxygenclass:: fmt::detail::buffer
    :members:
 
@@ -350,8 +362,8 @@ allocator::
 
     custom_string vformat(custom_allocator alloc, fmt::string_view format_str,
                           fmt::format_args args) {
-      custom_memory_buffer buf(alloc);
-      fmt::vformat_to(buf, format_str, args);
+      auto buf = custom_memory_buffer(alloc);
+      fmt::vformat_to(std::back_inserter(buf), format_str, args);
       return custom_string(buf.data(), buf.size(), alloc);
     }
 
@@ -519,8 +531,8 @@ argument type doesn't match its format specification.
 ``wchar_t`` Support
 ===================
 
-The optional header ``fmt/wchar_t.h`` provides support for ``wchar_t`` and
-exotic character types.
+The optional header ``fmt/xchar.h`` provides support for ``wchar_t`` and exotic
+character types.
 
 .. doxygenstruct:: fmt::is_char
 

externals/fmt/doc/basic-bootstrap/layout.html

@@ -90,12 +90,14 @@
         VERSION:     '{{ release|e }}',
         COLLAPSE_INDEX: false,
         FILE_SUFFIX: '{{ '' if no_search_suffix else file_suffix }}',
+        LINK_SUFFIX: '{{ link_suffix }}',
+        SOURCELINK_SUFFIX: '{{ sourcelink_suffix }}',
         HAS_SOURCE:  {{ has_source|lower }},
         SOURCELINK_SUFFIX:  '{{ sourcelink_suffix }}'
       };
     </script>
     {%- for scriptfile in script_files %}
-    <script type="text/javascript" src="{{ pathto(scriptfile, 1) }}"></script>
+    {{ js_tag(scriptfile) }}
     {%- endfor %}
 {%- endmacro %}
 

externals/fmt/doc/build.py

@@ -4,7 +4,7 @@
 import errno, os, re, sys
 from subprocess import check_call, CalledProcessError, Popen, PIPE, STDOUT
 
-versions = ['1.0.0', '1.1.0', '2.0.0', '3.0.2', '4.0.0', '4.1.0', '5.0.0', '5.1.0', '5.2.0', '5.2.1', '5.3.0', '6.0.0', '6.1.0', '6.1.1', '6.1.2', '6.2.0', '6.2.1', '7.0.0', '7.0.1', '7.0.2', '7.0.3', '7.1.0', '7.1.1', '7.1.2', '7.1.3', '8.0.0']
+versions = ['1.0.0', '1.1.0', '2.0.0', '3.0.2', '4.0.0', '4.1.0', '5.0.0', '5.1.0', '5.2.0', '5.2.1', '5.3.0', '6.0.0', '6.1.0', '6.1.1', '6.1.2', '6.2.0', '6.2.1', '7.0.0', '7.0.1', '7.0.2', '7.0.3', '7.1.0', '7.1.1', '7.1.2', '7.1.3', '8.0.0', '8.0.1', '8.1.0', '8.1.1']
 
 class Pip:
   def __init__(self, venv_dir):
@@ -26,8 +26,10 @@ def create_build_env(venv_dir='virtualenv'):
   pip = Pip(venv_dir)
   pip.install('wheel')
   pip.install('six')
+  # See: https://github.com/sphinx-doc/sphinx/issues/9777
+  pip.install('docutils==0.17.1')
   pip.install('sphinx-doc/sphinx', 'v3.3.0')
-  pip.install('michaeljones/breathe', 'v4.16.0')
+  pip.install('michaeljones/breathe', 'v4.25.0')
 
 def build_docs(version='dev', **kwargs):
   doc_dir = kwargs.get('doc_dir', os.path.dirname(os.path.realpath(__file__)))
@@ -58,6 +60,7 @@ def build_docs(version='dev', **kwargs):
       MACRO_EXPANSION   = YES
       PREDEFINED        = _WIN32=1 \
                           __linux__=1 \
+                          FMT_ENABLE_IF(...)= \
                           FMT_USE_VARIADIC_TEMPLATES=1 \
                           FMT_USE_RVALUE_REFERENCES=1 \
                           FMT_USE_USER_DEFINED_LITERALS=1 \
@@ -66,6 +69,8 @@ def build_docs(version='dev', **kwargs):
                           "FMT_BEGIN_NAMESPACE=namespace fmt {{" \
                           "FMT_END_NAMESPACE=}}" \
                           "FMT_STRING_ALIAS=1" \
+                          "FMT_VARIADIC(...)=" \
+                          "FMT_VARIADIC_W(...)=" \
                           "FMT_DOC=1"
       EXCLUDE_SYMBOLS   = fmt::formatter fmt::printf_formatter fmt::arg_join \
                           fmt::basic_format_arg::handle

externals/fmt/doc/syntax.rst

@@ -112,18 +112,18 @@ meaning in this case.
 The *sign* option is only valid for number types, and can be one of the
 following:
 
-+---------+----------------------------------------------------------+
-| Option  | Meaning                                                  |
-+=========+==========================================================+
-| ``'+'`` | indicates that a sign should be used for both            |
-|         | positive as well as negative numbers.                    |
-+---------+----------------------------------------------------------+
-| ``'-'`` | indicates that a sign should be used only for negative   |
-|         | numbers (this is the default behavior).                  |
-+---------+----------------------------------------------------------+
-| space   | indicates that a leading space should be used on         |
-|         | positive numbers, and a minus sign on negative numbers.  |
-+---------+----------------------------------------------------------+
++---------+------------------------------------------------------------+
+| Option  | Meaning                                                    |
++=========+============================================================+
+| ``'+'`` | indicates that a sign should be used for both              |
+|         | nonnegative as well as negative numbers.                   |
++---------+------------------------------------------------------------+
+| ``'-'`` | indicates that a sign should be used only for negative     |
+|         | numbers (this is the default behavior).                    |
++---------+------------------------------------------------------------+
+| space   | indicates that a leading space should be used on           |
+|         | nonnegative numbers, and a minus sign on negative numbers. |
++---------+------------------------------------------------------------+
 
 The ``'#'`` option causes the "alternate form" to be used for the
 conversion.  The alternate form is defined differently for different
@@ -161,7 +161,8 @@ displayed after the decimal point for a floating-point value formatted with
 value formatted with ``'g'`` or ``'G'``.  For non-number types the field
 indicates the maximum field size - in other words, how many characters will be
 used from the field content. The *precision* is not allowed for integer,
-character, Boolean, and pointer values.
+character, Boolean, and pointer values. Note that a C string must be
+null-terminated even if precision is specified.
 
 The ``'L'`` option uses the current locale setting to insert the appropriate
 number separator characters. This option is only valid for numeric types.
@@ -449,7 +450,7 @@ Using type-specific formatting::
 
 Using the comma as a thousands separator::
 
-   #include <fmt/locale.h>
+   #include <fmt/format.h>
 
    auto s = fmt::format(std::locale("en_US.UTF-8"), "{:L}", 1234567890);
    // s == "1,234,567,890"

externals/fmt/include/fmt/args.h

@@ -143,6 +143,8 @@ class dynamic_format_arg_store
   }
 
  public:
+  constexpr dynamic_format_arg_store() = default;
+
   /**
     \rst
     Adds an argument into the dynamic store for later passing to a formatting

externals/fmt/include/fmt/color.h

@@ -185,9 +185,13 @@ enum class terminal_color : uint8_t {
 
 enum class emphasis : uint8_t {
   bold = 1,
-  italic = 1 << 1,
-  underline = 1 << 2,
-  strikethrough = 1 << 3
+  faint = 1 << 1,
+  italic = 1 << 2,
+  underline = 1 << 3,
+  blink = 1 << 4,
+  reverse = 1 << 5,
+  conceal = 1 << 6,
+  strikethrough = 1 << 7,
 };
 
 // rgb is a struct for red, green and blue colors.
@@ -409,16 +413,18 @@ template <typename Char> struct ansi_color_escape {
     buffer[19] = static_cast<Char>(0);
   }
   FMT_CONSTEXPR ansi_color_escape(emphasis em) FMT_NOEXCEPT {
-    uint8_t em_codes[4] = {};
-    uint8_t em_bits = static_cast<uint8_t>(em);
-    if (em_bits & static_cast<uint8_t>(emphasis::bold)) em_codes[0] = 1;
-    if (em_bits & static_cast<uint8_t>(emphasis::italic)) em_codes[1] = 3;
-    if (em_bits & static_cast<uint8_t>(emphasis::underline)) em_codes[2] = 4;
-    if (em_bits & static_cast<uint8_t>(emphasis::strikethrough))
-      em_codes[3] = 9;
+    uint8_t em_codes[num_emphases] = {};
+    if (has_emphasis(em, emphasis::bold)) em_codes[0] = 1;
+    if (has_emphasis(em, emphasis::faint)) em_codes[1] = 2;
+    if (has_emphasis(em, emphasis::italic)) em_codes[2] = 3;
+    if (has_emphasis(em, emphasis::underline)) em_codes[3] = 4;
+    if (has_emphasis(em, emphasis::blink)) em_codes[4] = 5;
+    if (has_emphasis(em, emphasis::reverse)) em_codes[5] = 7;
+    if (has_emphasis(em, emphasis::conceal)) em_codes[6] = 8;
+    if (has_emphasis(em, emphasis::strikethrough)) em_codes[7] = 9;
 
     size_t index = 0;
-    for (int i = 0; i < 4; ++i) {
+    for (size_t i = 0; i < num_emphases; ++i) {
       if (!em_codes[i]) continue;
       buffer[index++] = static_cast<Char>('\x1b');
       buffer[index++] = static_cast<Char>('[');
@@ -435,7 +441,8 @@ template <typename Char> struct ansi_color_escape {
   }
 
  private:
-  Char buffer[7u + 3u * 4u + 1u];
+  static constexpr size_t num_emphases = 8;
+  Char buffer[7u + 3u * num_emphases + 1u];
 
   static FMT_CONSTEXPR void to_esc(uint8_t c, Char* out,
                                    char delimiter) FMT_NOEXCEPT {
@@ -444,6 +451,10 @@ template <typename Char> struct ansi_color_escape {
     out[2] = static_cast<Char>('0' + c % 10);
     out[3] = static_cast<Char>(delimiter);
   }
+  static FMT_CONSTEXPR bool has_emphasis(emphasis em,
+                                         emphasis mask) FMT_NOEXCEPT {
+    return static_cast<uint8_t>(em) & static_cast<uint8_t>(mask);
+  }
 };
 
 template <typename Char>
@@ -507,7 +518,7 @@ void vformat_to(buffer<Char>& buf, const text_style& ts,
     auto background = detail::make_background_color<Char>(ts.get_background());
     buf.append(background.begin(), background.end());
   }
-  detail::vformat_to(buf, format_str, args);
+  detail::vformat_to(buf, format_str, args, {});
   if (has_style) detail::reset_color<Char>(buf);
 }
 

externals/fmt/include/fmt/compile.h

@@ -156,7 +156,7 @@ struct is_compiled_string : std::is_base_of<compiled_string, S> {};
     std::string s = fmt::format(FMT_COMPILE("{}"), 42);
   \endrst
  */
-#ifdef __cpp_if_constexpr
+#if defined(__cpp_if_constexpr) && defined(__cpp_return_type_deduction)
 #  define FMT_COMPILE(s) \
     FMT_STRING_IMPL(s, fmt::detail::compiled_string, explicit)
 #else
@@ -179,7 +179,7 @@ const T& first(const T& value, const Tail&...) {
   return value;
 }
 
-#ifdef __cpp_if_constexpr
+#if defined(__cpp_if_constexpr) && defined(__cpp_return_type_deduction)
 template <typename... Args> struct type_list {};
 
 // Returns a reference to the argument at index N from [first, rest...].
@@ -190,7 +190,7 @@ constexpr const auto& get([[maybe_unused]] const T& first,
   if constexpr (N == 0)
     return first;
   else
-    return get<N - 1>(rest...);
+    return detail::get<N - 1>(rest...);
 }
 
 template <typename Char, typename... Args>
@@ -202,7 +202,8 @@ constexpr int get_arg_index_by_name(basic_string_view<Char> name,
 template <int N, typename> struct get_type_impl;
 
 template <int N, typename... Args> struct get_type_impl<N, type_list<Args...>> {
-  using type = remove_cvref_t<decltype(get<N>(std::declval<Args>()...))>;
+  using type =
+      remove_cvref_t<decltype(detail::get<N>(std::declval<Args>()...))>;
 };
 
 template <int N, typename T>
@@ -242,7 +243,7 @@ template <typename Char> struct code_unit {
 // This ensures that the argument type is convertible to `const T&`.
 template <typename T, int N, typename... Args>
 constexpr const T& get_arg_checked(const Args&... args) {
-  const auto& arg = get<N>(args...);
+  const auto& arg = detail::get<N>(args...);
   if constexpr (detail::is_named_arg<remove_cvref_t<decltype(arg)>>()) {
     return arg.value;
   } else {
@@ -289,7 +290,7 @@ template <typename Char> struct runtime_named_field {
   constexpr OutputIt format(OutputIt out, const Args&... args) const {
     bool found = (try_format_argument(out, name, args) || ...);
     if (!found) {
-      throw format_error("argument with specified name is not found");
+      FMT_THROW(format_error("argument with specified name is not found"));
     }
     return out;
   }
@@ -399,7 +400,9 @@ template <typename Char> struct arg_id_handler {
     return 0;
   }
 
-  constexpr void on_error(const char* message) { throw format_error(message); }
+  constexpr void on_error(const char* message) {
+    FMT_THROW(format_error(message));
+  }
 };
 
 template <typename Char> struct parse_arg_id_result {
@@ -451,7 +454,7 @@ constexpr auto compile_format_string(S format_str) {
   constexpr auto str = basic_string_view<char_type>(format_str);
   if constexpr (str[POS] == '{') {
     if constexpr (POS + 1 == str.size())
-      throw format_error("unmatched '{' in format string");
+      FMT_THROW(format_error("unmatched '{' in format string"));
     if constexpr (str[POS + 1] == '{') {
       return parse_tail<Args, POS + 2, ID>(make_text(str, POS, 1), format_str);
     } else if constexpr (str[POS + 1] == '}' || str[POS + 1] == ':') {
@@ -500,7 +503,7 @@ constexpr auto compile_format_string(S format_str) {
     }
   } else if constexpr (str[POS] == '}') {
     if constexpr (POS + 1 == str.size())
-      throw format_error("unmatched '}' in format string");
+      FMT_THROW(format_error("unmatched '}' in format string"));
     return parse_tail<Args, POS + 2, ID>(make_text(str, POS, 1), format_str);
   } else {
     constexpr auto end = parse_text(str, POS + 1);
@@ -527,12 +530,12 @@ constexpr auto compile(S format_str) {
     return result;
   }
 }
-#endif  // __cpp_if_constexpr
+#endif  // defined(__cpp_if_constexpr) && defined(__cpp_return_type_deduction)
 }  // namespace detail
 
 FMT_MODULE_EXPORT_BEGIN
 
-#ifdef __cpp_if_constexpr
+#if defined(__cpp_if_constexpr) && defined(__cpp_return_type_deduction)
 
 template <typename CompiledFormat, typename... Args,
           typename Char = typename CompiledFormat::char_type,

externals/fmt/include/fmt/format-inl.h

@@ -40,6 +40,10 @@ FMT_FUNC void assert_fail(const char* file, int line, const char* message) {
   std::terminate();
 }
 
+FMT_FUNC void throw_format_error(const char* message) {
+  FMT_THROW(format_error(message));
+}
+
 #ifndef _MSC_VER
 #  define FMT_SNPRINTF snprintf
 #else  // _MSC_VER
@@ -145,141 +149,13 @@ template <> FMT_FUNC int count_digits<4>(detail::fallback_uintptr n) {
   return i >= 0 ? i * char_digits + count_digits<4, unsigned>(n.value[i]) : 1;
 }
 
-#if __cplusplus < 201703L
-template <typename T> constexpr const char basic_data<T>::digits[][2];
-template <typename T> constexpr const char basic_data<T>::hex_digits[];
-template <typename T> constexpr const char basic_data<T>::signs[];
-template <typename T> constexpr const unsigned basic_data<T>::prefixes[];
-template <typename T> constexpr const char basic_data<T>::left_padding_shifts[];
-template <typename T>
-constexpr const char basic_data<T>::right_padding_shifts[];
-#endif
+// log10(2) = 0x0.4d104d427de7fbcc...
+static constexpr uint64_t log10_2_significand = 0x4d104d427de7fbcc;
 
-template <typename T> struct bits {
-  static FMT_CONSTEXPR_DECL const int value =
-      static_cast<int>(sizeof(T) * std::numeric_limits<unsigned char>::digits);
-};
-
-class fp;
-template <int SHIFT = 0> fp normalize(fp value);
-
-// Lower (upper) boundary is a value half way between a floating-point value
-// and its predecessor (successor). Boundaries have the same exponent as the
-// value so only significands are stored.
-struct boundaries {
-  uint64_t lower;
-  uint64_t upper;
-};
-
-// A handmade floating-point number f * pow(2, e).
-class fp {
- private:
-  using significand_type = uint64_t;
-
-  template <typename Float>
-  using is_supported_float = bool_constant<sizeof(Float) == sizeof(uint64_t) ||
-                                           sizeof(Float) == sizeof(uint32_t)>;
-
- public:
-  significand_type f;
-  int e;
-
-  // All sizes are in bits.
-  // Subtract 1 to account for an implicit most significant bit in the
-  // normalized form.
-  static FMT_CONSTEXPR_DECL const int double_significand_size =
-      std::numeric_limits<double>::digits - 1;
-  static FMT_CONSTEXPR_DECL const uint64_t implicit_bit =
-      1ULL << double_significand_size;
-  static FMT_CONSTEXPR_DECL const int significand_size =
-      bits<significand_type>::value;
-
-  fp() : f(0), e(0) {}
-  fp(uint64_t f_val, int e_val) : f(f_val), e(e_val) {}
-
-  // Constructs fp from an IEEE754 double. It is a template to prevent compile
-  // errors on platforms where double is not IEEE754.
-  template <typename Double> explicit fp(Double d) { assign(d); }
-
-  // Assigns d to this and return true iff predecessor is closer than successor.
-  template <typename Float, FMT_ENABLE_IF(is_supported_float<Float>::value)>
-  bool assign(Float d) {
-    // Assume float is in the format [sign][exponent][significand].
-    using limits = std::numeric_limits<Float>;
-    const int float_significand_size = limits::digits - 1;
-    const int exponent_size =
-        bits<Float>::value - float_significand_size - 1;  // -1 for sign
-    const uint64_t float_implicit_bit = 1ULL << float_significand_size;
-    const uint64_t significand_mask = float_implicit_bit - 1;
-    const uint64_t exponent_mask = (~0ULL >> 1) & ~significand_mask;
-    const int exponent_bias = (1 << exponent_size) - limits::max_exponent - 1;
-    constexpr bool is_double = sizeof(Float) == sizeof(uint64_t);
-    auto u = bit_cast<conditional_t<is_double, uint64_t, uint32_t>>(d);
-    f = u & significand_mask;
-    int biased_e =
-        static_cast<int>((u & exponent_mask) >> float_significand_size);
-    // Predecessor is closer if d is a normalized power of 2 (f == 0) other than
-    // the smallest normalized number (biased_e > 1).
-    bool is_predecessor_closer = f == 0 && biased_e > 1;
-    if (biased_e != 0)
-      f += float_implicit_bit;
-    else
-      biased_e = 1;  // Subnormals use biased exponent 1 (min exponent).
-    e = biased_e - exponent_bias - float_significand_size;
-    return is_predecessor_closer;
-  }
-
-  template <typename Float, FMT_ENABLE_IF(!is_supported_float<Float>::value)>
-  bool assign(Float) {
-    *this = fp();
-    return false;
-  }
-};
-
-// Normalizes the value converted from double and multiplied by (1 << SHIFT).
-template <int SHIFT> fp normalize(fp value) {
-  // Handle subnormals.
-  const auto shifted_implicit_bit = fp::implicit_bit << SHIFT;
-  while ((value.f & shifted_implicit_bit) == 0) {
-    value.f <<= 1;
-    --value.e;
-  }
-  // Subtract 1 to account for hidden bit.
-  const auto offset =
-      fp::significand_size - fp::double_significand_size - SHIFT - 1;
-  value.f <<= offset;
-  value.e -= offset;
-  return value;
-}
-
-inline bool operator==(fp x, fp y) { return x.f == y.f && x.e == y.e; }
-
-// Computes lhs * rhs / pow(2, 64) rounded to nearest with half-up tie breaking.
-inline uint64_t multiply(uint64_t lhs, uint64_t rhs) {
-#if FMT_USE_INT128
-  auto product = static_cast<__uint128_t>(lhs) * rhs;
-  auto f = static_cast<uint64_t>(product >> 64);
-  return (static_cast<uint64_t>(product) & (1ULL << 63)) != 0 ? f + 1 : f;
-#else
-  // Multiply 32-bit parts of significands.
-  uint64_t mask = (1ULL << 32) - 1;
-  uint64_t a = lhs >> 32, b = lhs & mask;
-  uint64_t c = rhs >> 32, d = rhs & mask;
-  uint64_t ac = a * c, bc = b * c, ad = a * d, bd = b * d;
-  // Compute mid 64-bit of result and round.
-  uint64_t mid = (bd >> 32) + (ad & mask) + (bc & mask) + (1U << 31);
-  return ac + (ad >> 32) + (bc >> 32) + (mid >> 32);
-#endif
-}
-
-inline fp operator*(fp x, fp y) { return {multiply(x.f, y.f), x.e + y.e + 64}; }
-
-// Returns a cached power of 10 `c_k = c_k.f * pow(2, c_k.e)` such that its
-// (binary) exponent satisfies `min_exponent <= c_k.e <= min_exponent + 28`.
-inline fp get_cached_power(int min_exponent, int& pow10_exponent) {
+template <typename T = void> struct basic_impl_data {
   // Normalized 64-bit significands of pow(10, k), for k = -348, -340, ..., 340.
   // These are generated by support/compute-powers.py.
-  static constexpr const uint64_t pow10_significands[] = {
+  static constexpr uint64_t pow10_significands[87] = {
       0xfa8fd5a0081c0288, 0xbaaee17fa23ebf76, 0x8b16fb203055ac76,
       0xcf42894a5dce35ea, 0x9a6bb0aa55653b2d, 0xe61acf033d1a45df,
       0xab70fe17c79ac6ca, 0xff77b1fcbebcdc4f, 0xbe5691ef416bd60c,
@@ -311,9 +187,13 @@ inline fp get_cached_power(int min_exponent, int& pow10_exponent) {
       0x9e19db92b4e31ba9, 0xeb96bf6ebadf77d9, 0xaf87023b9bf0ee6b,
   };
 
+#if FMT_GCC_VERSION && FMT_GCC_VERSION < 409
+#  pragma GCC diagnostic push
+#  pragma GCC diagnostic ignored "-Wnarrowing"
+#endif
   // Binary exponents of pow(10, k), for k = -348, -340, ..., 340, corresponding
   // to significands above.
-  static constexpr const int16_t pow10_exponents[] = {
+  static constexpr int16_t pow10_exponents[87] = {
       -1220, -1193, -1166, -1140, -1113, -1087, -1060, -1034, -1007, -980, -954,
       -927,  -901,  -874,  -847,  -821,  -794,  -768,  -741,  -715,  -688, -661,
       -635,  -608,  -582,  -555,  -529,  -502,  -475,  -449,  -422,  -396, -369,
@@ -322,11 +202,137 @@ inline fp get_cached_power(int min_exponent, int& pow10_exponent) {
       242,   269,   295,   322,   348,   375,   402,   428,   455,   481,  508,
       534,   561,   588,   614,   641,   667,   694,   720,   747,   774,  800,
       827,   853,   880,   907,   933,   960,   986,   1013,  1039,  1066};
+#if FMT_GCC_VERSION && FMT_GCC_VERSION < 409
+#  pragma GCC diagnostic pop
+#endif
 
+  static constexpr uint64_t power_of_10_64[20] = {
+      1, FMT_POWERS_OF_10(1ULL), FMT_POWERS_OF_10(1000000000ULL),
+      10000000000000000000ULL};
+};
+
+// This is a struct rather than an alias to avoid shadowing warnings in gcc.
+struct impl_data : basic_impl_data<> {};
+
+#if __cplusplus < 201703L
+template <typename T>
+constexpr uint64_t basic_impl_data<T>::pow10_significands[];
+template <typename T> constexpr int16_t basic_impl_data<T>::pow10_exponents[];
+template <typename T> constexpr uint64_t basic_impl_data<T>::power_of_10_64[];
+#endif
+
+template <typename T> struct bits {
+  static FMT_CONSTEXPR_DECL const int value =
+      static_cast<int>(sizeof(T) * std::numeric_limits<unsigned char>::digits);
+};
+
+// Returns the number of significand bits in Float excluding the implicit bit.
+template <typename Float> constexpr int num_significand_bits() {
+  // Subtract 1 to account for an implicit most significant bit in the
+  // normalized form.
+  return std::numeric_limits<Float>::digits - 1;
+}
+
+// A floating-point number f * pow(2, e).
+struct fp {
+  uint64_t f;
+  int e;
+
+  static constexpr const int num_significand_bits = bits<decltype(f)>::value;
+
+  constexpr fp() : f(0), e(0) {}
+  constexpr fp(uint64_t f_val, int e_val) : f(f_val), e(e_val) {}
+
+  // Constructs fp from an IEEE754 floating-point number. It is a template to
+  // prevent compile errors on systems where n is not IEEE754.
+  template <typename Float> explicit FMT_CONSTEXPR fp(Float n) { assign(n); }
+
+  template <typename Float>
+  using is_supported = bool_constant<sizeof(Float) == sizeof(uint64_t) ||
+                                     sizeof(Float) == sizeof(uint32_t)>;
+
+  // Assigns d to this and return true iff predecessor is closer than successor.
+  template <typename Float, FMT_ENABLE_IF(is_supported<Float>::value)>
+  FMT_CONSTEXPR bool assign(Float n) {
+    // Assume float is in the format [sign][exponent][significand].
+    const int num_float_significand_bits =
+        detail::num_significand_bits<Float>();
+    const uint64_t implicit_bit = 1ULL << num_float_significand_bits;
+    const uint64_t significand_mask = implicit_bit - 1;
+    constexpr bool is_double = sizeof(Float) == sizeof(uint64_t);
+    auto u = bit_cast<conditional_t<is_double, uint64_t, uint32_t>>(n);
+    f = u & significand_mask;
+    const uint64_t exponent_mask = (~0ULL >> 1) & ~significand_mask;
+    int biased_e =
+        static_cast<int>((u & exponent_mask) >> num_float_significand_bits);
+    // The predecessor is closer if n is a normalized power of 2 (f == 0) other
+    // than the smallest normalized number (biased_e > 1).
+    bool is_predecessor_closer = f == 0 && biased_e > 1;
+    if (biased_e != 0)
+      f += implicit_bit;
+    else
+      biased_e = 1;  // Subnormals use biased exponent 1 (min exponent).
+    const int exponent_bias = std::numeric_limits<Float>::max_exponent - 1;
+    e = biased_e - exponent_bias - num_float_significand_bits;
+    return is_predecessor_closer;
+  }
+
+  template <typename Float, FMT_ENABLE_IF(!is_supported<Float>::value)>
+  bool assign(Float) {
+    FMT_ASSERT(false, "");
+    return false;
+  }
+};
+
+// Normalizes the value converted from double and multiplied by (1 << SHIFT).
+template <int SHIFT = 0> FMT_CONSTEXPR fp normalize(fp value) {
+  // Handle subnormals.
+  const uint64_t implicit_bit = 1ULL << num_significand_bits<double>();
+  const auto shifted_implicit_bit = implicit_bit << SHIFT;
+  while ((value.f & shifted_implicit_bit) == 0) {
+    value.f <<= 1;
+    --value.e;
+  }
+  // Subtract 1 to account for hidden bit.
+  const auto offset =
+      fp::num_significand_bits - num_significand_bits<double>() - SHIFT - 1;
+  value.f <<= offset;
+  value.e -= offset;
+  return value;
+}
+
+inline bool operator==(fp x, fp y) { return x.f == y.f && x.e == y.e; }
+
+// Computes lhs * rhs / pow(2, 64) rounded to nearest with half-up tie breaking.
+FMT_CONSTEXPR inline uint64_t multiply(uint64_t lhs, uint64_t rhs) {
+#if FMT_USE_INT128
+  auto product = static_cast<__uint128_t>(lhs) * rhs;
+  auto f = static_cast<uint64_t>(product >> 64);
+  return (static_cast<uint64_t>(product) & (1ULL << 63)) != 0 ? f + 1 : f;
+#else
+  // Multiply 32-bit parts of significands.
+  uint64_t mask = (1ULL << 32) - 1;
+  uint64_t a = lhs >> 32, b = lhs & mask;
+  uint64_t c = rhs >> 32, d = rhs & mask;
+  uint64_t ac = a * c, bc = b * c, ad = a * d, bd = b * d;
+  // Compute mid 64-bit of result and round.
+  uint64_t mid = (bd >> 32) + (ad & mask) + (bc & mask) + (1U << 31);
+  return ac + (ad >> 32) + (bc >> 32) + (mid >> 32);
+#endif
+}
+
+FMT_CONSTEXPR inline fp operator*(fp x, fp y) {
+  return {multiply(x.f, y.f), x.e + y.e + 64};
+}
+
+// Returns a cached power of 10 `c_k = c_k.f * pow(2, c_k.e)` such that its
+// (binary) exponent satisfies `min_exponent <= c_k.e <= min_exponent + 28`.
+FMT_CONSTEXPR inline fp get_cached_power(int min_exponent,
+                                         int& pow10_exponent) {
   const int shift = 32;
-  const auto significand = static_cast<int64_t>(data::log10_2_significand);
+  const auto significand = static_cast<int64_t>(log10_2_significand);
   int index = static_cast<int>(
-      ((min_exponent + fp::significand_size - 1) * (significand >> shift) +
+      ((min_exponent + fp::num_significand_bits - 1) * (significand >> shift) +
        ((int64_t(1) << shift) - 1))  // ceil
       >> 32                          // arithmetic shift
   );
@@ -336,7 +342,8 @@ inline fp get_cached_power(int min_exponent, int& pow10_exponent) {
   const int dec_exp_step = 8;
   index = (index - first_dec_exp - 1) / dec_exp_step + 1;
   pow10_exponent = first_dec_exp + index * dec_exp_step;
-  return {pow10_significands[index], pow10_exponents[index]};
+  return {impl_data::pow10_significands[index],
+          impl_data::pow10_exponents[index]};
 }
 
 // A simple accumulator to hold the sums of terms in bigint::square if uint128_t
@@ -345,14 +352,16 @@ struct accumulator {
   uint64_t lower;
   uint64_t upper;
 
-  accumulator() : lower(0), upper(0) {}
-  explicit operator uint32_t() const { return static_cast<uint32_t>(lower); }
+  constexpr accumulator() : lower(0), upper(0) {}
+  constexpr explicit operator uint32_t() const {
+    return static_cast<uint32_t>(lower);
+  }
 
-  void operator+=(uint64_t n) {
+  FMT_CONSTEXPR void operator+=(uint64_t n) {
     lower += n;
     if (lower < n) ++upper;
   }
-  void operator>>=(int shift) {
+  FMT_CONSTEXPR void operator>>=(int shift) {
     FMT_ASSERT(shift == 32, "");
     (void)shift;
     lower = (upper << 32) | (lower >> 32);
@@ -370,27 +379,31 @@ class bigint {
   basic_memory_buffer<bigit, bigits_capacity> bigits_;
   int exp_;
 
-  bigit operator[](int index) const { return bigits_[to_unsigned(index)]; }
-  bigit& operator[](int index) { return bigits_[to_unsigned(index)]; }
+  FMT_CONSTEXPR20 bigit operator[](int index) const {
+    return bigits_[to_unsigned(index)];
+  }
+  FMT_CONSTEXPR20 bigit& operator[](int index) {
+    return bigits_[to_unsigned(index)];
+  }
 
   static FMT_CONSTEXPR_DECL const int bigit_bits = bits<bigit>::value;
 
   friend struct formatter<bigint>;
 
-  void subtract_bigits(int index, bigit other, bigit& borrow) {
+  FMT_CONSTEXPR20 void subtract_bigits(int index, bigit other, bigit& borrow) {
     auto result = static_cast<double_bigit>((*this)[index]) - other - borrow;
     (*this)[index] = static_cast<bigit>(result);
     borrow = static_cast<bigit>(result >> (bigit_bits * 2 - 1));
   }
 
-  void remove_leading_zeros() {
+  FMT_CONSTEXPR20 void remove_leading_zeros() {
     int num_bigits = static_cast<int>(bigits_.size()) - 1;
     while (num_bigits > 0 && (*this)[num_bigits] == 0) --num_bigits;
     bigits_.resize(to_unsigned(num_bigits + 1));
   }
 
   // Computes *this -= other assuming aligned bigints and *this >= other.
-  void subtract_aligned(const bigint& other) {
+  FMT_CONSTEXPR20 void subtract_aligned(const bigint& other) {
     FMT_ASSERT(other.exp_ >= exp_, "unaligned bigints");
     FMT_ASSERT(compare(*this, other) >= 0, "");
     bigit borrow = 0;
@@ -401,7 +414,7 @@ class bigint {
     remove_leading_zeros();
   }
 
-  void multiply(uint32_t value) {
+  FMT_CONSTEXPR20 void multiply(uint32_t value) {
     const double_bigit wide_value = value;
     bigit carry = 0;
     for (size_t i = 0, n = bigits_.size(); i < n; ++i) {
@@ -412,7 +425,7 @@ class bigint {
     if (carry != 0) bigits_.push_back(carry);
   }
 
-  void multiply(uint64_t value) {
+  FMT_CONSTEXPR20 void multiply(uint64_t value) {
     const bigit mask = ~bigit(0);
     const double_bigit lower = value & mask;
     const double_bigit upper = value >> bigit_bits;
@@ -430,14 +443,16 @@ class bigint {
   }
 
  public:
-  bigint() : exp_(0) {}
+  FMT_CONSTEXPR20 bigint() : exp_(0) {}
   explicit bigint(uint64_t n) { assign(n); }
-  ~bigint() { FMT_ASSERT(bigits_.capacity() <= bigits_capacity, ""); }
+  FMT_CONSTEXPR20 ~bigint() {
+    FMT_ASSERT(bigits_.capacity() <= bigits_capacity, "");
+  }
 
   bigint(const bigint&) = delete;
   void operator=(const bigint&) = delete;
 
-  void assign(const bigint& other) {
+  FMT_CONSTEXPR20 void assign(const bigint& other) {
     auto size = other.bigits_.size();
     bigits_.resize(size);
     auto data = other.bigits_.data();
@@ -445,7 +460,7 @@ class bigint {
     exp_ = other.exp_;
   }
 
-  void assign(uint64_t n) {
+  FMT_CONSTEXPR20 void assign(uint64_t n) {
     size_t num_bigits = 0;
     do {
       bigits_[num_bigits++] = n & ~bigit(0);
@@ -455,9 +470,11 @@ class bigint {
     exp_ = 0;
   }
 
-  int num_bigits() const { return static_cast<int>(bigits_.size()) + exp_; }
+  FMT_CONSTEXPR20 int num_bigits() const {
+    return static_cast<int>(bigits_.size()) + exp_;
+  }
 
-  FMT_NOINLINE bigint& operator<<=(int shift) {
+  FMT_NOINLINE FMT_CONSTEXPR20 bigint& operator<<=(int shift) {
     FMT_ASSERT(shift >= 0, "");
     exp_ += shift / bigit_bits;
     shift %= bigit_bits;
@@ -472,13 +489,13 @@ class bigint {
     return *this;
   }
 
-  template <typename Int> bigint& operator*=(Int value) {
+  template <typename Int> FMT_CONSTEXPR20 bigint& operator*=(Int value) {
     FMT_ASSERT(value > 0, "");
     multiply(uint32_or_64_or_128_t<Int>(value));
     return *this;
   }
 
-  friend int compare(const bigint& lhs, const bigint& rhs) {
+  friend FMT_CONSTEXPR20 int compare(const bigint& lhs, const bigint& rhs) {
     int num_lhs_bigits = lhs.num_bigits(), num_rhs_bigits = rhs.num_bigits();
     if (num_lhs_bigits != num_rhs_bigits)
       return num_lhs_bigits > num_rhs_bigits ? 1 : -1;
@@ -495,8 +512,8 @@ class bigint {
   }
 
   // Returns compare(lhs1 + lhs2, rhs).
-  friend int add_compare(const bigint& lhs1, const bigint& lhs2,
-                         const bigint& rhs) {
+  friend FMT_CONSTEXPR20 int add_compare(const bigint& lhs1, const bigint& lhs2,
+                                         const bigint& rhs) {
     int max_lhs_bigits = (std::max)(lhs1.num_bigits(), lhs2.num_bigits());
     int num_rhs_bigits = rhs.num_bigits();
     if (max_lhs_bigits + 1 < num_rhs_bigits) return -1;
@@ -519,7 +536,7 @@ class bigint {
   }
 
   // Assigns pow(10, exp) to this bigint.
-  void assign_pow10(int exp) {
+  FMT_CONSTEXPR20 void assign_pow10(int exp) {
     FMT_ASSERT(exp >= 0, "");
     if (exp == 0) return assign(1);
     // Find the top bit.
@@ -538,7 +555,7 @@ class bigint {
     *this <<= exp;  // Multiply by pow(2, exp) by shifting.
   }
 
-  void square() {
+  FMT_CONSTEXPR20 void square() {
     int num_bigits = static_cast<int>(bigits_.size());
     int num_result_bigits = 2 * num_bigits;
     basic_memory_buffer<bigit, bigits_capacity> n(std::move(bigits_));
@@ -563,14 +580,13 @@ class bigint {
       (*this)[bigit_index] = static_cast<bigit>(sum);
       sum >>= bits<bigit>::value;
     }
-    --num_result_bigits;
     remove_leading_zeros();
     exp_ *= 2;
   }
 
   // If this bigint has a bigger exponent than other, adds trailing zero to make
   // exponents equal. This simplifies some operations such as subtraction.
-  void align(const bigint& other) {
+  FMT_CONSTEXPR20 void align(const bigint& other) {
     int exp_difference = exp_ - other.exp_;
     if (exp_difference <= 0) return;
     int num_bigits = static_cast<int>(bigits_.size());
@@ -583,7 +599,7 @@ class bigint {
 
   // Divides this bignum by divisor, assigning the remainder to this and
   // returning the quotient.
-  int divmod_assign(const bigint& divisor) {
+  FMT_CONSTEXPR20 int divmod_assign(const bigint& divisor) {
     FMT_ASSERT(this != &divisor, "");
     if (compare(*this, divisor) < 0) return 0;
     FMT_ASSERT(divisor.bigits_[divisor.bigits_.size() - 1u] != 0, "");
@@ -603,8 +619,9 @@ enum class round_direction { unknown, up, down };
 // some number v and the error, returns whether v should be rounded up, down, or
 // whether the rounding direction can't be determined due to error.
 // error should be less than divisor / 2.
-inline round_direction get_round_direction(uint64_t divisor, uint64_t remainder,
-                                           uint64_t error) {
+FMT_CONSTEXPR inline round_direction get_round_direction(uint64_t divisor,
+                                                         uint64_t remainder,
+                                                         uint64_t error) {
   FMT_ASSERT(remainder < divisor, "");  // divisor - remainder won't overflow.
   FMT_ASSERT(error < divisor, "");      // divisor - error won't overflow.
   FMT_ASSERT(error < divisor - error, "");  // error * 2 won't overflow.
@@ -627,19 +644,52 @@ enum result {
 };
 }
 
-inline uint64_t power_of_10_64(int exp) {
-  static constexpr const uint64_t data[] = {1, FMT_POWERS_OF_10(1),
-                                            FMT_POWERS_OF_10(1000000000ULL),
-                                            10000000000000000000ULL};
-  return data[exp];
-}
+struct gen_digits_handler {
+  char* buf;
+  int size;
+  int precision;
+  int exp10;
+  bool fixed;
+
+  FMT_CONSTEXPR digits::result on_digit(char digit, uint64_t divisor,
+                                        uint64_t remainder, uint64_t error,
+                                        bool integral) {
+    FMT_ASSERT(remainder < divisor, "");
+    buf[size++] = digit;
+    if (!integral && error >= remainder) return digits::error;
+    if (size < precision) return digits::more;
+    if (!integral) {
+      // Check if error * 2 < divisor with overflow prevention.
+      // The check is not needed for the integral part because error = 1
+      // and divisor > (1 << 32) there.
+      if (error >= divisor || error >= divisor - error) return digits::error;
+    } else {
+      FMT_ASSERT(error == 1 && divisor > 2, "");
+    }
+    auto dir = get_round_direction(divisor, remainder, error);
+    if (dir != round_direction::up)
+      return dir == round_direction::down ? digits::done : digits::error;
+    ++buf[size - 1];
+    for (int i = size - 1; i > 0 && buf[i] > '9'; --i) {
+      buf[i] = '0';
+      ++buf[i - 1];
+    }
+    if (buf[0] > '9') {
+      buf[0] = '1';
+      if (fixed)
+        buf[size++] = '0';
+      else
+        ++exp10;
+    }
+    return digits::done;
+  }
+};
 
 // Generates output using the Grisu digit-gen algorithm.
 // error: the size of the region (lower, upper) outside of which numbers
 // definitely do not round to value (Delta in Grisu3).
-template <typename Handler>
-FMT_INLINE digits::result grisu_gen_digits(fp value, uint64_t error, int& exp,
-                                           Handler& handler) {
+FMT_INLINE FMT_CONSTEXPR20 digits::result grisu_gen_digits(
+    fp value, uint64_t error, int& exp, gen_digits_handler& handler) {
   const fp one(1ULL << -value.e, value.e);
   // The integral part of scaled value (p1 in Grisu) = value / one. It cannot be
   // zero because it contains a product of two 64-bit numbers with MSB set (due
@@ -650,10 +700,28 @@ FMT_INLINE digits::result grisu_gen_digits(fp value, uint64_t error, int& exp,
   // The fractional part of scaled value (p2 in Grisu) c = value % one.
   uint64_t fractional = value.f & (one.f - 1);
   exp = count_digits(integral);  // kappa in Grisu.
-  // Divide by 10 to prevent overflow.
-  auto result = handler.on_start(power_of_10_64(exp - 1) << -one.e,
-                                 value.f / 10, error * 10, exp);
-  if (result != digits::more) return result;
+  // Non-fixed formats require at least one digit and no precision adjustment.
+  if (handler.fixed) {
+    // Adjust fixed precision by exponent because it is relative to decimal
+    // point.
+    int precision_offset = exp + handler.exp10;
+    if (precision_offset > 0 &&
+        handler.precision > max_value<int>() - precision_offset) {
+      FMT_THROW(format_error("number is too big"));
+    }
+    handler.precision += precision_offset;
+    // Check if precision is satisfied just by leading zeros, e.g.
+    // format("{:.2f}", 0.001) gives "0.00" without generating any digits.
+    if (handler.precision <= 0) {
+      if (handler.precision < 0) return digits::done;
+      // Divide by 10 to prevent overflow.
+      uint64_t divisor = impl_data::power_of_10_64[exp - 1] << -one.e;
+      auto dir = get_round_direction(divisor, value.f / 10, error * 10);
+      if (dir == round_direction::unknown) return digits::error;
+      handler.buf[handler.size++] = dir == round_direction::up ? '1' : '0';
+      return digits::done;
+    }
+  }
   // Generate digits for the integral part. This can produce up to 10 digits.
   do {
     uint32_t digit = 0;
@@ -700,9 +768,9 @@ FMT_INLINE digits::result grisu_gen_digits(fp value, uint64_t error, int& exp,
     }
     --exp;
     auto remainder = (static_cast<uint64_t>(integral) << -one.e) + fractional;
-    result = handler.on_digit(static_cast<char>('0' + digit),
-                              power_of_10_64(exp) << -one.e, remainder, error,
-                              exp, true);
+    auto result = handler.on_digit(static_cast<char>('0' + digit),
+                                   impl_data::power_of_10_64[exp] << -one.e,
+                                   remainder, error, true);
     if (result != digits::more) return result;
   } while (exp > 0);
   // Generate digits for the fractional part.
@@ -712,69 +780,11 @@ FMT_INLINE digits::result grisu_gen_digits(fp value, uint64_t error, int& exp,
     char digit = static_cast<char>('0' + (fractional >> -one.e));
     fractional &= one.f - 1;
     --exp;
-    result = handler.on_digit(digit, one.f, fractional, error, exp, false);
+    auto result = handler.on_digit(digit, one.f, fractional, error, false);
     if (result != digits::more) return result;
   }
 }
 
-// The fixed precision digit handler.
-struct fixed_handler {
-  char* buf;
-  int size;
-  int precision;
-  int exp10;
-  bool fixed;
-
-  digits::result on_start(uint64_t divisor, uint64_t remainder, uint64_t error,
-                          int& exp) {
-    // Non-fixed formats require at least one digit and no precision adjustment.
-    if (!fixed) return digits::more;
-    // Adjust fixed precision by exponent because it is relative to decimal
-    // point.
-    precision += exp + exp10;
-    // Check if precision is satisfied just by leading zeros, e.g.
-    // format("{:.2f}", 0.001) gives "0.00" without generating any digits.
-    if (precision > 0) return digits::more;
-    if (precision < 0) return digits::done;
-    auto dir = get_round_direction(divisor, remainder, error);
-    if (dir == round_direction::unknown) return digits::error;
-    buf[size++] = dir == round_direction::up ? '1' : '0';
-    return digits::done;
-  }
-
-  digits::result on_digit(char digit, uint64_t divisor, uint64_t remainder,
-                          uint64_t error, int, bool integral) {
-    FMT_ASSERT(remainder < divisor, "");
-    buf[size++] = digit;
-    if (!integral && error >= remainder) return digits::error;
-    if (size < precision) return digits::more;
-    if (!integral) {
-      // Check if error * 2 < divisor with overflow prevention.
-      // The check is not needed for the integral part because error = 1
-      // and divisor > (1 << 32) there.
-      if (error >= divisor || error >= divisor - error) return digits::error;
-    } else {
-      FMT_ASSERT(error == 1 && divisor > 2, "");
-    }
-    auto dir = get_round_direction(divisor, remainder, error);
-    if (dir != round_direction::up)
-      return dir == round_direction::down ? digits::done : digits::error;
-    ++buf[size - 1];
-    for (int i = size - 1; i > 0 && buf[i] > '9'; --i) {
-      buf[i] = '0';
-      ++buf[i - 1];
-    }
-    if (buf[0] > '9') {
-      buf[0] = '1';
-      if (fixed)
-        buf[size++] = '0';
-      else
-        ++exp10;
-    }
-    return digits::done;
-  }
-};
-
 // A 128-bit integer type used internally,
 struct uint128_wrapper {
   uint128_wrapper() = default;
@@ -898,8 +908,7 @@ inline uint64_t umul96_lower64(uint32_t x, uint64_t y) FMT_NOEXCEPT {
 inline int floor_log10_pow2(int e) FMT_NOEXCEPT {
   FMT_ASSERT(e <= 1700 && e >= -1700, "too large exponent");
   const int shift = 22;
-  return (e * static_cast<int>(data::log10_2_significand >> (64 - shift))) >>
-         shift;
+  return (e * static_cast<int>(log10_2_significand >> (64 - shift))) >> shift;
 }
 
 // Various fast log computations.
@@ -917,8 +926,7 @@ inline int floor_log10_pow2_minus_log10_4_over_3(int e) FMT_NOEXCEPT {
   FMT_ASSERT(e <= 1700 && e >= -1700, "too large exponent");
   const uint64_t log10_4_over_3_fractional_digits = 0x1ffbfc2bbc780375;
   const int shift_amount = 22;
-  return (e * static_cast<int>(data::log10_2_significand >>
-                               (64 - shift_amount)) -
+  return (e * static_cast<int>(log10_2_significand >> (64 - shift_amount)) -
           static_cast<int>(log10_4_over_3_fractional_digits >>
                            (64 - shift_amount))) >>
          shift_amount;
@@ -1043,7 +1051,7 @@ template <> struct cache_accessor<float> {
   static uint64_t get_cached_power(int k) FMT_NOEXCEPT {
     FMT_ASSERT(k >= float_info<float>::min_k && k <= float_info<float>::max_k,
                "k is out of range");
-    constexpr const uint64_t pow10_significands[] = {
+    static constexpr const uint64_t pow10_significands[] = {
         0x81ceb32c4b43fcf5, 0xa2425ff75e14fc32, 0xcad2f7f5359a3b3f,
         0xfd87b5f28300ca0e, 0x9e74d1b791e07e49, 0xc612062576589ddb,
         0xf79687aed3eec552, 0x9abe14cd44753b53, 0xc16d9a0095928a28,
@@ -2211,24 +2219,21 @@ small_divisor_case_label:
 }
 }  // namespace dragonbox
 
-// Formats value using a variation of the Fixed-Precision Positive
-// Floating-Point Printout ((FPP)^2) algorithm by Steele & White:
+// Formats a floating-point number using a variation of the Fixed-Precision
+// Positive Floating-Point Printout ((FPP)^2) algorithm by Steele & White:
 // https://fmt.dev/papers/p372-steele.pdf.
-template <typename Double>
-void fallback_format(Double d, int num_digits, bool binary32, buffer<char>& buf,
-                     int& exp10) {
+FMT_CONSTEXPR20 inline void format_dragon(fp value, bool is_predecessor_closer,
+                                          int num_digits, buffer<char>& buf,
+                                          int& exp10) {
   bigint numerator;    // 2 * R in (FPP)^2.
   bigint denominator;  // 2 * S in (FPP)^2.
   // lower and upper are differences between value and corresponding boundaries.
   bigint lower;             // (M^- in (FPP)^2).
   bigint upper_store;       // upper's value if different from lower.
   bigint* upper = nullptr;  // (M^+ in (FPP)^2).
-  fp value;
   // Shift numerator and denominator by an extra bit or two (if lower boundary
   // is closer) to make lower and upper integers. This eliminates multiplication
   // by 2 during later computations.
-  const bool is_predecessor_closer =
-      binary32 ? value.assign(static_cast<float>(d)) : value.assign(d);
   int shift = is_predecessor_closer ? 2 : 1;
   uint64_t significand = value.f << shift;
   if (value.e >= 0) {
@@ -2298,9 +2303,9 @@ void fallback_format(Double d, int num_digits, bool binary32, buffer<char>& buf,
   // Generate the given number of digits.
   exp10 -= num_digits - 1;
   if (num_digits == 0) {
-    buf.try_resize(1);
     denominator *= 10;
-    buf[0] = add_compare(numerator, numerator, denominator) > 0 ? '1' : '0';
+    auto digit = add_compare(numerator, numerator, denominator) > 0 ? '1' : '0';
+    buf.push_back(digit);
     return;
   }
   buf.try_resize(to_unsigned(num_digits));
@@ -2331,9 +2336,12 @@ void fallback_format(Double d, int num_digits, bool binary32, buffer<char>& buf,
   buf[num_digits - 1] = static_cast<char>('0' + digit);
 }
 
-template <typename T>
-int format_float(T value, int precision, float_specs specs, buffer<char>& buf) {
-  static_assert(!std::is_same<T, float>::value, "");
+template <typename Float>
+FMT_HEADER_ONLY_CONSTEXPR20 int format_float(Float value, int precision,
+                                             float_specs specs,
+                                             buffer<char>& buf) {
+  // float is passed as double to reduce the number of instantiations.
+  static_assert(!std::is_same<Float, float>::value, "");
   FMT_ASSERT(value >= 0, "value is negative");
 
   const bool fixed = specs.format == float_format::fixed;
@@ -2343,13 +2351,13 @@ int format_float(T value, int precision, float_specs specs, buffer<char>& buf) {
       return 0;
     }
     buf.try_resize(to_unsigned(precision));
-    std::uninitialized_fill_n(buf.data(), precision, '0');
+    fill_n(buf.data(), precision, '0');
     return -precision;
   }
 
-  if (!specs.use_grisu) return snprintf_float(value, precision, specs, buf);
+  if (specs.fallback) return snprintf_float(value, precision, specs, buf);
 
-  if (precision < 0) {
+  if (!is_constant_evaluated() && precision < 0) {
     // Use Dragonbox for the shortest format.
     if (specs.binary32) {
       auto dec = dragonbox::to_decimal(static_cast<float>(value));
@@ -2361,26 +2369,37 @@ int format_float(T value, int precision, float_specs specs, buffer<char>& buf) {
     return dec.exponent;
   }
 
-  // Use Grisu + Dragon4 for the given precision:
-  // https://www.cs.tufts.edu/~nr/cs257/archive/florian-loitsch/printf.pdf.
   int exp = 0;
-  const int min_exp = -60;  // alpha in Grisu.
-  int cached_exp10 = 0;     // K in Grisu.
-  fp normalized = normalize(fp(value));
-  const auto cached_pow = get_cached_power(
-      min_exp - (normalized.e + fp::significand_size), cached_exp10);
-  normalized = normalized * cached_pow;
-  // Limit precision to the maximum possible number of significant digits in an
-  // IEEE754 double because we don't need to generate zeros.
-  const int max_double_digits = 767;
-  if (precision > max_double_digits) precision = max_double_digits;
-  fixed_handler handler{buf.data(), 0, precision, -cached_exp10, fixed};
-  if (grisu_gen_digits(normalized, 1, exp, handler) == digits::error) {
-    exp += handler.size - cached_exp10 - 1;
-    fallback_format(value, handler.precision, specs.binary32, buf, exp);
-  } else {
-    exp += handler.exp10;
-    buf.try_resize(to_unsigned(handler.size));
+  bool use_dragon = true;
+  if (is_fast_float<Float>()) {
+    // Use Grisu + Dragon4 for the given precision:
+    // https://www.cs.tufts.edu/~nr/cs257/archive/florian-loitsch/printf.pdf.
+    const int min_exp = -60;  // alpha in Grisu.
+    int cached_exp10 = 0;     // K in Grisu.
+    fp normalized = normalize(fp(value));
+    const auto cached_pow = get_cached_power(
+        min_exp - (normalized.e + fp::num_significand_bits), cached_exp10);
+    normalized = normalized * cached_pow;
+    gen_digits_handler handler{buf.data(), 0, precision, -cached_exp10, fixed};
+    if (grisu_gen_digits(normalized, 1, exp, handler) != digits::error &&
+        !is_constant_evaluated()) {
+      exp += handler.exp10;
+      buf.try_resize(to_unsigned(handler.size));
+      use_dragon = false;
+    } else {
+      exp += handler.size - cached_exp10 - 1;
+      precision = handler.precision;
+    }
+  }
+  if (use_dragon) {
+    auto f = fp();
+    bool is_predecessor_closer =
+        specs.binary32 ? f.assign(static_cast<float>(value)) : f.assign(value);
+    // Limit precision to the maximum possible number of significant digits in
+    // an IEEE754 double because we don't need to generate zeros.
+    const int max_double_digits = 767;
+    if (precision > max_double_digits) precision = max_double_digits;
+    format_dragon(f, is_predecessor_closer, precision, buf, exp);
   }
   if (!fixed && !specs.showpoint) {
     // Remove trailing zeros.
@@ -2392,7 +2411,7 @@ int format_float(T value, int precision, float_specs specs, buffer<char>& buf) {
     buf.try_resize(num_digits);
   }
   return exp;
-}  // namespace detail
+}
 
 template <typename T>
 int snprintf_float(T value, int precision, float_specs specs,
@@ -2526,8 +2545,8 @@ template <> struct formatter<detail::bigint> {
 };
 
 FMT_FUNC detail::utf8_to_utf16::utf8_to_utf16(string_view s) {
-  for_each_codepoint(s, [this](uint32_t cp, int error) {
-    if (error != 0) FMT_THROW(std::runtime_error("invalid utf8"));
+  for_each_codepoint(s, [this](uint32_t cp, string_view) {
+    if (cp == invalid_code_point) FMT_THROW(std::runtime_error("invalid utf8"));
     if (cp <= 0xFFFF) {
       buffer_.push_back(static_cast<wchar_t>(cp));
     } else {
@@ -2535,6 +2554,7 @@ FMT_FUNC detail::utf8_to_utf16::utf8_to_utf16(string_view s) {
       buffer_.push_back(static_cast<wchar_t>(0xD800 + (cp >> 10)));
       buffer_.push_back(static_cast<wchar_t>(0xDC00 + (cp & 0x3FF)));
     }
+    return true;
   });
   buffer_.push_back(0);
 }
@@ -2550,15 +2570,17 @@ FMT_FUNC void format_system_error(detail::buffer<char>& out, int error_code,
   format_error_code(out, error_code, message);
 }
 
-FMT_FUNC void detail::error_handler::on_error(const char* message) {
-  FMT_THROW(format_error(message));
-}
-
 FMT_FUNC void report_system_error(int error_code,
                                   const char* message) FMT_NOEXCEPT {
   report_error(format_system_error, error_code, message);
 }
 
+// DEPRECATED!
+// This function is defined here and not inline for ABI compatiblity.
+FMT_FUNC void detail::error_handler::on_error(const char* message) {
+  throw_format_error(message);
+}
+
 FMT_FUNC std::string vformat(string_view fmt, format_args args) {
   // Don't optimize the "{}" case to keep the binary size small and because it
   // can be better optimized in fmt::format anyway.

externals/fmt/include/fmt/os.h

@@ -21,17 +21,20 @@
 
 #include "format.h"
 
+#ifndef FMT_USE_FCNTL
 // UWP doesn't provide _pipe.
-#if FMT_HAS_INCLUDE("winapifamily.h")
-#  include <winapifamily.h>
-#endif
-#if (FMT_HAS_INCLUDE(<fcntl.h>) || defined(__APPLE__) || \
-     defined(__linux__)) &&                              \
-    (!defined(WINAPI_FAMILY) || (WINAPI_FAMILY == WINAPI_FAMILY_DESKTOP_APP))
-#  include <fcntl.h>  // for O_RDONLY
-#  define FMT_USE_FCNTL 1
-#else
-#  define FMT_USE_FCNTL 0
+#  if FMT_HAS_INCLUDE("winapifamily.h")
+#    include <winapifamily.h>
+#  endif
+#  if (FMT_HAS_INCLUDE(<fcntl.h>) || defined(__APPLE__) || \
+       defined(__linux__)) &&                              \
+      (!defined(WINAPI_FAMILY) ||                          \
+       (WINAPI_FAMILY == WINAPI_FAMILY_DESKTOP_APP))
+#    include <fcntl.h>  // for O_RDONLY
+#    define FMT_USE_FCNTL 1
+#  else
+#    define FMT_USE_FCNTL 0
+#  endif
 #endif
 
 #ifndef FMT_POSIX
@@ -390,23 +393,26 @@ struct ostream_params {
       : ostream_params(params...) {
     this->buffer_size = bs.value;
   }
+
+// Intel has a bug that results in failure to deduce a constructor
+// for empty parameter packs.
+#  if defined(__INTEL_COMPILER) && __INTEL_COMPILER < 2000
+  ostream_params(int new_oflag) : oflag(new_oflag) {}
+  ostream_params(detail::buffer_size bs) : buffer_size(bs.value) {}
+#  endif
 };
 
 FMT_END_DETAIL_NAMESPACE
 
-static constexpr detail::buffer_size buffer_size;
+// Added {} below to work around default constructor error known to
+// occur in Xcode versions 7.2.1 and 8.2.1.
+constexpr detail::buffer_size buffer_size{};
 
 /** A fast output stream which is not thread-safe. */
 class FMT_API ostream final : private detail::buffer<char> {
  private:
   file file_;
 
-  void flush() {
-    if (size() == 0) return;
-    file_.write(data(), size());
-    clear();
-  }
-
   void grow(size_t) override;
 
   ostream(cstring_view path, const detail::ostream_params& params)
@@ -426,6 +432,12 @@ class FMT_API ostream final : private detail::buffer<char> {
     delete[] data();
   }
 
+  void flush() {
+    if (size() == 0) return;
+    file_.write(data(), size());
+    clear();
+  }
+
   template <typename... T>
   friend ostream output_file(cstring_view path, T... params);
 
@@ -500,7 +512,7 @@ class locale {
 
   // Converts string to floating-point number and advances str past the end
   // of the parsed input.
-  double strtod(const char*& str) const {
+  FMT_DEPRECATED double strtod(const char*& str) const {
     char* end = nullptr;
     double result = strtod_l(str, &end, locale_);
     str = end;

externals/fmt/include/fmt/ostream.h

@@ -14,73 +14,20 @@
 
 FMT_BEGIN_NAMESPACE
 
-template <typename Char> class basic_printf_parse_context;
 template <typename OutputIt, typename Char> class basic_printf_context;
 
 namespace detail {
 
-template <class Char> class formatbuf : public std::basic_streambuf<Char> {
- private:
-  using int_type = typename std::basic_streambuf<Char>::int_type;
-  using traits_type = typename std::basic_streambuf<Char>::traits_type;
-
-  buffer<Char>& buffer_;
-
- public:
-  formatbuf(buffer<Char>& buf) : buffer_(buf) {}
-
- protected:
-  // The put-area is actually always empty. This makes the implementation
-  // simpler and has the advantage that the streambuf and the buffer are always
-  // in sync and sputc never writes into uninitialized memory. The obvious
-  // disadvantage is that each call to sputc always results in a (virtual) call
-  // to overflow. There is no disadvantage here for sputn since this always
-  // results in a call to xsputn.
-
-  int_type overflow(int_type ch = traits_type::eof()) FMT_OVERRIDE {
-    if (!traits_type::eq_int_type(ch, traits_type::eof()))
-      buffer_.push_back(static_cast<Char>(ch));
-    return ch;
-  }
-
-  std::streamsize xsputn(const Char* s, std::streamsize count) FMT_OVERRIDE {
-    buffer_.append(s, s + count);
-    return count;
-  }
-};
-
-struct converter {
-  template <typename T, FMT_ENABLE_IF(is_integral<T>::value)> converter(T);
-};
-
-template <typename Char> struct test_stream : std::basic_ostream<Char> {
- private:
-  void_t<> operator<<(converter);
-};
-
-// Hide insertion operators for built-in types.
-template <typename Char, typename Traits>
-void_t<> operator<<(std::basic_ostream<Char, Traits>&, Char);
-template <typename Char, typename Traits>
-void_t<> operator<<(std::basic_ostream<Char, Traits>&, char);
-template <typename Traits>
-void_t<> operator<<(std::basic_ostream<char, Traits>&, char);
-template <typename Traits>
-void_t<> operator<<(std::basic_ostream<char, Traits>&, signed char);
-template <typename Traits>
-void_t<> operator<<(std::basic_ostream<char, Traits>&, unsigned char);
-
-// Checks if T has a user-defined operator<< (e.g. not a member of
-// std::ostream).
-template <typename T, typename Char> class is_streamable {
+// Checks if T has a user-defined operator<<.
+template <typename T, typename Char, typename Enable = void>
+class is_streamable {
  private:
   template <typename U>
-  static bool_constant<!std::is_same<decltype(std::declval<test_stream<Char>&>()
-                                              << std::declval<U>()),
-                                     void_t<>>::value>
-  test(int);
+  static auto test(int)
+      -> bool_constant<sizeof(std::declval<std::basic_ostream<Char>&>()
+                              << std::declval<U>()) != 0>;
 
-  template <typename> static std::false_type test(...);
+  template <typename> static auto test(...) -> std::false_type;
 
   using result = decltype(test<T>(0));
 
@@ -90,7 +37,21 @@ template <typename T, typename Char> class is_streamable {
   static const bool value = result::value;
 };
 
+// Formatting of built-in types and arrays is intentionally disabled because
+// it's handled by standard (non-ostream) formatters.
+template <typename T, typename Char>
+struct is_streamable<
+    T, Char,
+    enable_if_t<
+        std::is_arithmetic<T>::value || std::is_array<T>::value ||
+        std::is_pointer<T>::value || std::is_same<T, char8_type>::value ||
+        std::is_same<T, std::basic_string<Char>>::value ||
+        std::is_same<T, std_string_view<Char>>::value ||
+        (std::is_convertible<T, int>::value && !std::is_enum<T>::value)>>
+    : std::false_type {};
+
 // Write the content of buf to os.
+// It is a separate function rather than a part of vprint to simplify testing.
 template <typename Char>
 void write_buffer(std::basic_ostream<Char>& os, buffer<Char>& buf) {
   const Char* buf_data = buf.data();
@@ -108,8 +69,8 @@ void write_buffer(std::basic_ostream<Char>& os, buffer<Char>& buf) {
 template <typename Char, typename T>
 void format_value(buffer<Char>& buf, const T& value,
                   locale_ref loc = locale_ref()) {
-  formatbuf<Char> format_buf(buf);
-  std::basic_ostream<Char> output(&format_buf);
+  auto&& format_buf = formatbuf<std::basic_streambuf<Char>>(buf);
+  auto&& output = std::basic_ostream<Char>(&format_buf);
 #if !defined(FMT_STATIC_THOUSANDS_SEPARATOR)
   if (loc) output.imbue(loc.get<std::locale>());
 #endif
@@ -122,29 +83,22 @@ void format_value(buffer<Char>& buf, const T& value,
 template <typename T, typename Char>
 struct fallback_formatter<T, Char, enable_if_t<is_streamable<T, Char>::value>>
     : private formatter<basic_string_view<Char>, Char> {
-  FMT_CONSTEXPR auto parse(basic_format_parse_context<Char>& ctx)
-      -> decltype(ctx.begin()) {
-    return formatter<basic_string_view<Char>, Char>::parse(ctx);
-  }
-  template <typename ParseCtx,
-            FMT_ENABLE_IF(std::is_same<
-                          ParseCtx, basic_printf_parse_context<Char>>::value)>
-  auto parse(ParseCtx& ctx) -> decltype(ctx.begin()) {
-    return ctx.begin();
-  }
+  using formatter<basic_string_view<Char>, Char>::parse;
 
   template <typename OutputIt>
   auto format(const T& value, basic_format_context<OutputIt, Char>& ctx)
       -> OutputIt {
-    basic_memory_buffer<Char> buffer;
+    auto buffer = basic_memory_buffer<Char>();
     format_value(buffer, value, ctx.locale());
-    basic_string_view<Char> str(buffer.data(), buffer.size());
-    return formatter<basic_string_view<Char>, Char>::format(str, ctx);
+    return formatter<basic_string_view<Char>, Char>::format(
+        {buffer.data(), buffer.size()}, ctx);
   }
+
+  // DEPRECATED!
   template <typename OutputIt>
   auto format(const T& value, basic_printf_context<OutputIt, Char>& ctx)
       -> OutputIt {
-    basic_memory_buffer<Char> buffer;
+    auto buffer = basic_memory_buffer<Char>();
     format_value(buffer, value, ctx.locale());
     return std::copy(buffer.begin(), buffer.end(), ctx.out());
   }
@@ -155,7 +109,7 @@ FMT_MODULE_EXPORT
 template <typename Char>
 void vprint(std::basic_ostream<Char>& os, basic_string_view<Char> format_str,
             basic_format_args<buffer_context<type_identity_t<Char>>> args) {
-  basic_memory_buffer<Char> buffer;
+  auto buffer = basic_memory_buffer<Char>();
   detail::vformat_to(buffer, format_str, args);
   detail::write_buffer(os, buffer);
 }

externals/fmt/include/fmt/printf.h

@@ -233,7 +233,7 @@ class printf_arg_formatter : public arg_formatter<Char> {
 
   OutputIt write_null_pointer(bool is_string = false) {
     auto s = this->specs;
-    s.type = 0;
+    s.type = presentation_type::none;
     return write_bytes(this->out, is_string ? "(null)" : "(nil)", s);
   }
 
@@ -249,8 +249,10 @@ class printf_arg_formatter : public arg_formatter<Char> {
     // std::is_same instead.
     if (std::is_same<T, Char>::value) {
       format_specs fmt_specs = this->specs;
-      if (fmt_specs.type && fmt_specs.type != 'c')
+      if (fmt_specs.type != presentation_type::none &&
+          fmt_specs.type != presentation_type::chr) {
         return (*this)(static_cast<int>(value));
+      }
       fmt_specs.sign = sign::none;
       fmt_specs.alt = false;
       fmt_specs.fill[0] = ' ';  // Ignore '0' flag for char types.
@@ -271,13 +273,13 @@ class printf_arg_formatter : public arg_formatter<Char> {
   /** Formats a null-terminated C string. */
   OutputIt operator()(const char* value) {
     if (value) return base::operator()(value);
-    return write_null_pointer(this->specs.type != 'p');
+    return write_null_pointer(this->specs.type != presentation_type::pointer);
   }
 
   /** Formats a null-terminated wide C string. */
   OutputIt operator()(const wchar_t* value) {
     if (value) return base::operator()(value);
-    return write_null_pointer(this->specs.type != 'p');
+    return write_null_pointer(this->specs.type != presentation_type::pointer);
   }
 
   OutputIt operator()(basic_string_view<Char> value) {
@@ -490,13 +492,13 @@ void vprintf(buffer<Char>& buf, basic_string_view<Char> format,
 
     // Parse type.
     if (it == end) FMT_THROW(format_error("invalid format string"));
-    specs.type = static_cast<char>(*it++);
+    char type = static_cast<char>(*it++);
     if (arg.is_integral()) {
       // Normalize type.
-      switch (specs.type) {
+      switch (type) {
       case 'i':
       case 'u':
-        specs.type = 'd';
+        type = 'd';
         break;
       case 'c':
         visit_format_arg(
@@ -505,6 +507,9 @@ void vprintf(buffer<Char>& buf, basic_string_view<Char> format,
         break;
       }
     }
+    specs.type = parse_presentation_type(type);
+    if (specs.type == presentation_type::none)
+      parse_ctx.on_error("invalid type specifier");
 
     start = it;
 

externals/fmt/include/fmt/ranges.h

@@ -13,37 +13,13 @@
 #define FMT_RANGES_H_
 
 #include <initializer_list>
+#include <tuple>
 #include <type_traits>
 
 #include "format.h"
 
 FMT_BEGIN_NAMESPACE
 
-template <typename Char, typename Enable = void> struct formatting_range {
-#ifdef FMT_DEPRECATED_BRACED_RANGES
-  Char prefix = '{';
-  Char postfix = '}';
-#else
-  Char prefix = '[';
-  Char postfix = ']';
-#endif
-
-  template <typename ParseContext>
-  FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {
-    return ctx.begin();
-  }
-};
-
-template <typename Char, typename Enable = void> struct formatting_tuple {
-  Char prefix = '(';
-  Char postfix = ')';
-
-  template <typename ParseContext>
-  FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {
-    return ctx.begin();
-  }
-};
-
 namespace detail {
 
 template <typename RangeT, typename OutputIterator>
@@ -71,7 +47,7 @@ OutputIterator copy(wchar_t ch, OutputIterator out) {
   return out;
 }
 
-/// Return true value if T has std::string interface, like std::string_view.
+// Returns true if T has a std::string-like interface, like std::string_view.
 template <typename T> class is_std_string_like {
   template <typename U>
   static auto check(U* p)
@@ -80,12 +56,40 @@ template <typename T> class is_std_string_like {
 
  public:
   static FMT_CONSTEXPR_DECL const bool value =
-      is_string<T>::value || !std::is_void<decltype(check<T>(nullptr))>::value;
+      is_string<T>::value ||
+      std::is_convertible<T, std_string_view<char>>::value ||
+      !std::is_void<decltype(check<T>(nullptr))>::value;
 };
 
 template <typename Char>
 struct is_std_string_like<fmt::basic_string_view<Char>> : std::true_type {};
 
+template <typename T> class is_map {
+  template <typename U> static auto check(U*) -> typename U::mapped_type;
+  template <typename> static void check(...);
+
+ public:
+#ifdef FMT_FORMAT_MAP_AS_LIST
+  static FMT_CONSTEXPR_DECL const bool value = false;
+#else
+  static FMT_CONSTEXPR_DECL const bool value =
+      !std::is_void<decltype(check<T>(nullptr))>::value;
+#endif
+};
+
+template <typename T> class is_set {
+  template <typename U> static auto check(U*) -> typename U::key_type;
+  template <typename> static void check(...);
+
+ public:
+#ifdef FMT_FORMAT_SET_AS_LIST
+  static FMT_CONSTEXPR_DECL const bool value = false;
+#else
+  static FMT_CONSTEXPR_DECL const bool value =
+      !std::is_void<decltype(check<T>(nullptr))>::value && !is_map<T>::value;
+#endif
+};
+
 template <typename... Ts> struct conditional_helper {};
 
 template <typename T, typename _ = void> struct is_range_ : std::false_type {};
@@ -143,16 +147,16 @@ struct has_mutable_begin_end : std::false_type {};
 
 template <typename T>
 struct has_const_begin_end<
-    T, void_t<decltype(detail::range_begin(
-                  std::declval<const remove_cvref_t<T>&>())),
-              decltype(detail::range_begin(
-                  std::declval<const remove_cvref_t<T>&>()))>>
+    T,
+    void_t<
+        decltype(detail::range_begin(std::declval<const remove_cvref_t<T>&>())),
+        decltype(detail::range_end(std::declval<const remove_cvref_t<T>&>()))>>
     : std::true_type {};
 
 template <typename T>
 struct has_mutable_begin_end<
     T, void_t<decltype(detail::range_begin(std::declval<T>())),
-              decltype(detail::range_begin(std::declval<T>())),
+              decltype(detail::range_end(std::declval<T>())),
               enable_if_t<std::is_copy_constructible<T>::value>>>
     : std::true_type {};
 
@@ -160,34 +164,10 @@ template <typename T>
 struct is_range_<T, void>
     : std::integral_constant<bool, (has_const_begin_end<T>::value ||
                                     has_mutable_begin_end<T>::value)> {};
-
-template <typename T, typename Enable = void> struct range_to_view;
-template <typename T>
-struct range_to_view<T, enable_if_t<has_const_begin_end<T>::value>> {
-  struct view_t {
-    const T* m_range_ptr;
-
-    auto begin() const FMT_DECLTYPE_RETURN(detail::range_begin(*m_range_ptr));
-    auto end() const FMT_DECLTYPE_RETURN(detail::range_end(*m_range_ptr));
-  };
-  static auto view(const T& range) -> view_t { return {&range}; }
-};
-
-template <typename T>
-struct range_to_view<T, enable_if_t<!has_const_begin_end<T>::value &&
-                                    has_mutable_begin_end<T>::value>> {
-  struct view_t {
-    T m_range_copy;
-
-    auto begin() FMT_DECLTYPE_RETURN(detail::range_begin(m_range_copy));
-    auto end() FMT_DECLTYPE_RETURN(detail::range_end(m_range_copy));
-  };
-  static auto view(const T& range) -> view_t { return {range}; }
-};
 #  undef FMT_DECLTYPE_RETURN
 #endif
 
-/// tuple_size and tuple_element check.
+// tuple_size and tuple_element check.
 template <typename T> class is_tuple_like_ {
   template <typename U>
   static auto check(U* p) -> decltype(std::tuple_size<U>::value, int());
@@ -251,16 +231,295 @@ template <typename OutputIt> OutputIt write_delimiter(OutputIt out) {
   return out;
 }
 
-template <
-    typename Char, typename OutputIt, typename Arg,
-    FMT_ENABLE_IF(is_std_string_like<typename std::decay<Arg>::type>::value)>
-OutputIt write_range_entry(OutputIt out, const Arg& v) {
+struct singleton {
+  unsigned char upper;
+  unsigned char lower_count;
+};
+
+inline auto is_printable(uint16_t x, const singleton* singletons,
+                         size_t singletons_size,
+                         const unsigned char* singleton_lowers,
+                         const unsigned char* normal, size_t normal_size)
+    -> bool {
+  auto upper = x >> 8;
+  auto lower_start = 0;
+  for (size_t i = 0; i < singletons_size; ++i) {
+    auto s = singletons[i];
+    auto lower_end = lower_start + s.lower_count;
+    if (upper < s.upper) break;
+    if (upper == s.upper) {
+      for (auto j = lower_start; j < lower_end; ++j) {
+        if (singleton_lowers[j] == (x & 0xff)) return false;
+      }
+    }
+    lower_start = lower_end;
+  }
+
+  auto xsigned = static_cast<int>(x);
+  auto current = true;
+  for (size_t i = 0; i < normal_size; ++i) {
+    auto v = static_cast<int>(normal[i]);
+    auto len = (v & 0x80) != 0 ? (v & 0x7f) << 8 | normal[++i] : v;
+    xsigned -= len;
+    if (xsigned < 0) break;
+    current = !current;
+  }
+  return current;
+}
+
+// Returns true iff the code point cp is printable.
+// This code is generated by support/printable.py.
+inline auto is_printable(uint32_t cp) -> bool {
+  static constexpr singleton singletons0[] = {
+      {0x00, 1},  {0x03, 5},  {0x05, 6},  {0x06, 3},  {0x07, 6},  {0x08, 8},
+      {0x09, 17}, {0x0a, 28}, {0x0b, 25}, {0x0c, 20}, {0x0d, 16}, {0x0e, 13},
+      {0x0f, 4},  {0x10, 3},  {0x12, 18}, {0x13, 9},  {0x16, 1},  {0x17, 5},
+      {0x18, 2},  {0x19, 3},  {0x1a, 7},  {0x1c, 2},  {0x1d, 1},  {0x1f, 22},
+      {0x20, 3},  {0x2b, 3},  {0x2c, 2},  {0x2d, 11}, {0x2e, 1},  {0x30, 3},
+      {0x31, 2},  {0x32, 1},  {0xa7, 2},  {0xa9, 2},  {0xaa, 4},  {0xab, 8},
+      {0xfa, 2},  {0xfb, 5},  {0xfd, 4},  {0xfe, 3},  {0xff, 9},
+  };
+  static constexpr unsigned char singletons0_lower[] = {
+      0xad, 0x78, 0x79, 0x8b, 0x8d, 0xa2, 0x30, 0x57, 0x58, 0x8b, 0x8c, 0x90,
+      0x1c, 0x1d, 0xdd, 0x0e, 0x0f, 0x4b, 0x4c, 0xfb, 0xfc, 0x2e, 0x2f, 0x3f,
+      0x5c, 0x5d, 0x5f, 0xb5, 0xe2, 0x84, 0x8d, 0x8e, 0x91, 0x92, 0xa9, 0xb1,
+      0xba, 0xbb, 0xc5, 0xc6, 0xc9, 0xca, 0xde, 0xe4, 0xe5, 0xff, 0x00, 0x04,
+      0x11, 0x12, 0x29, 0x31, 0x34, 0x37, 0x3a, 0x3b, 0x3d, 0x49, 0x4a, 0x5d,
+      0x84, 0x8e, 0x92, 0xa9, 0xb1, 0xb4, 0xba, 0xbb, 0xc6, 0xca, 0xce, 0xcf,
+      0xe4, 0xe5, 0x00, 0x04, 0x0d, 0x0e, 0x11, 0x12, 0x29, 0x31, 0x34, 0x3a,
+      0x3b, 0x45, 0x46, 0x49, 0x4a, 0x5e, 0x64, 0x65, 0x84, 0x91, 0x9b, 0x9d,
+      0xc9, 0xce, 0xcf, 0x0d, 0x11, 0x29, 0x45, 0x49, 0x57, 0x64, 0x65, 0x8d,
+      0x91, 0xa9, 0xb4, 0xba, 0xbb, 0xc5, 0xc9, 0xdf, 0xe4, 0xe5, 0xf0, 0x0d,
+      0x11, 0x45, 0x49, 0x64, 0x65, 0x80, 0x84, 0xb2, 0xbc, 0xbe, 0xbf, 0xd5,
+      0xd7, 0xf0, 0xf1, 0x83, 0x85, 0x8b, 0xa4, 0xa6, 0xbe, 0xbf, 0xc5, 0xc7,
+      0xce, 0xcf, 0xda, 0xdb, 0x48, 0x98, 0xbd, 0xcd, 0xc6, 0xce, 0xcf, 0x49,
+      0x4e, 0x4f, 0x57, 0x59, 0x5e, 0x5f, 0x89, 0x8e, 0x8f, 0xb1, 0xb6, 0xb7,
+      0xbf, 0xc1, 0xc6, 0xc7, 0xd7, 0x11, 0x16, 0x17, 0x5b, 0x5c, 0xf6, 0xf7,
+      0xfe, 0xff, 0x80, 0x0d, 0x6d, 0x71, 0xde, 0xdf, 0x0e, 0x0f, 0x1f, 0x6e,
+      0x6f, 0x1c, 0x1d, 0x5f, 0x7d, 0x7e, 0xae, 0xaf, 0xbb, 0xbc, 0xfa, 0x16,
+      0x17, 0x1e, 0x1f, 0x46, 0x47, 0x4e, 0x4f, 0x58, 0x5a, 0x5c, 0x5e, 0x7e,
+      0x7f, 0xb5, 0xc5, 0xd4, 0xd5, 0xdc, 0xf0, 0xf1, 0xf5, 0x72, 0x73, 0x8f,
+      0x74, 0x75, 0x96, 0x2f, 0x5f, 0x26, 0x2e, 0x2f, 0xa7, 0xaf, 0xb7, 0xbf,
+      0xc7, 0xcf, 0xd7, 0xdf, 0x9a, 0x40, 0x97, 0x98, 0x30, 0x8f, 0x1f, 0xc0,
+      0xc1, 0xce, 0xff, 0x4e, 0x4f, 0x5a, 0x5b, 0x07, 0x08, 0x0f, 0x10, 0x27,
+      0x2f, 0xee, 0xef, 0x6e, 0x6f, 0x37, 0x3d, 0x3f, 0x42, 0x45, 0x90, 0x91,
+      0xfe, 0xff, 0x53, 0x67, 0x75, 0xc8, 0xc9, 0xd0, 0xd1, 0xd8, 0xd9, 0xe7,
+      0xfe, 0xff,
+  };
+  static constexpr singleton singletons1[] = {
+      {0x00, 6},  {0x01, 1}, {0x03, 1},  {0x04, 2}, {0x08, 8},  {0x09, 2},
+      {0x0a, 5},  {0x0b, 2}, {0x0e, 4},  {0x10, 1}, {0x11, 2},  {0x12, 5},
+      {0x13, 17}, {0x14, 1}, {0x15, 2},  {0x17, 2}, {0x19, 13}, {0x1c, 5},
+      {0x1d, 8},  {0x24, 1}, {0x6a, 3},  {0x6b, 2}, {0xbc, 2},  {0xd1, 2},
+      {0xd4, 12}, {0xd5, 9}, {0xd6, 2},  {0xd7, 2}, {0xda, 1},  {0xe0, 5},
+      {0xe1, 2},  {0xe8, 2}, {0xee, 32}, {0xf0, 4}, {0xf8, 2},  {0xf9, 2},
+      {0xfa, 2},  {0xfb, 1},
+  };
+  static constexpr unsigned char singletons1_lower[] = {
+      0x0c, 0x27, 0x3b, 0x3e, 0x4e, 0x4f, 0x8f, 0x9e, 0x9e, 0x9f, 0x06, 0x07,
+      0x09, 0x36, 0x3d, 0x3e, 0x56, 0xf3, 0xd0, 0xd1, 0x04, 0x14, 0x18, 0x36,
+      0x37, 0x56, 0x57, 0x7f, 0xaa, 0xae, 0xaf, 0xbd, 0x35, 0xe0, 0x12, 0x87,
+      0x89, 0x8e, 0x9e, 0x04, 0x0d, 0x0e, 0x11, 0x12, 0x29, 0x31, 0x34, 0x3a,
+      0x45, 0x46, 0x49, 0x4a, 0x4e, 0x4f, 0x64, 0x65, 0x5c, 0xb6, 0xb7, 0x1b,
+      0x1c, 0x07, 0x08, 0x0a, 0x0b, 0x14, 0x17, 0x36, 0x39, 0x3a, 0xa8, 0xa9,
+      0xd8, 0xd9, 0x09, 0x37, 0x90, 0x91, 0xa8, 0x07, 0x0a, 0x3b, 0x3e, 0x66,
+      0x69, 0x8f, 0x92, 0x6f, 0x5f, 0xee, 0xef, 0x5a, 0x62, 0x9a, 0x9b, 0x27,
+      0x28, 0x55, 0x9d, 0xa0, 0xa1, 0xa3, 0xa4, 0xa7, 0xa8, 0xad, 0xba, 0xbc,
+      0xc4, 0x06, 0x0b, 0x0c, 0x15, 0x1d, 0x3a, 0x3f, 0x45, 0x51, 0xa6, 0xa7,
+      0xcc, 0xcd, 0xa0, 0x07, 0x19, 0x1a, 0x22, 0x25, 0x3e, 0x3f, 0xc5, 0xc6,
+      0x04, 0x20, 0x23, 0x25, 0x26, 0x28, 0x33, 0x38, 0x3a, 0x48, 0x4a, 0x4c,
+      0x50, 0x53, 0x55, 0x56, 0x58, 0x5a, 0x5c, 0x5e, 0x60, 0x63, 0x65, 0x66,
+      0x6b, 0x73, 0x78, 0x7d, 0x7f, 0x8a, 0xa4, 0xaa, 0xaf, 0xb0, 0xc0, 0xd0,
+      0xae, 0xaf, 0x79, 0xcc, 0x6e, 0x6f, 0x93,
+  };
+  static constexpr unsigned char normal0[] = {
+      0x00, 0x20, 0x5f, 0x22, 0x82, 0xdf, 0x04, 0x82, 0x44, 0x08, 0x1b, 0x04,
+      0x06, 0x11, 0x81, 0xac, 0x0e, 0x80, 0xab, 0x35, 0x28, 0x0b, 0x80, 0xe0,
+      0x03, 0x19, 0x08, 0x01, 0x04, 0x2f, 0x04, 0x34, 0x04, 0x07, 0x03, 0x01,
+      0x07, 0x06, 0x07, 0x11, 0x0a, 0x50, 0x0f, 0x12, 0x07, 0x55, 0x07, 0x03,
+      0x04, 0x1c, 0x0a, 0x09, 0x03, 0x08, 0x03, 0x07, 0x03, 0x02, 0x03, 0x03,
+      0x03, 0x0c, 0x04, 0x05, 0x03, 0x0b, 0x06, 0x01, 0x0e, 0x15, 0x05, 0x3a,
+      0x03, 0x11, 0x07, 0x06, 0x05, 0x10, 0x07, 0x57, 0x07, 0x02, 0x07, 0x15,
+      0x0d, 0x50, 0x04, 0x43, 0x03, 0x2d, 0x03, 0x01, 0x04, 0x11, 0x06, 0x0f,
+      0x0c, 0x3a, 0x04, 0x1d, 0x25, 0x5f, 0x20, 0x6d, 0x04, 0x6a, 0x25, 0x80,
+      0xc8, 0x05, 0x82, 0xb0, 0x03, 0x1a, 0x06, 0x82, 0xfd, 0x03, 0x59, 0x07,
+      0x15, 0x0b, 0x17, 0x09, 0x14, 0x0c, 0x14, 0x0c, 0x6a, 0x06, 0x0a, 0x06,
+      0x1a, 0x06, 0x59, 0x07, 0x2b, 0x05, 0x46, 0x0a, 0x2c, 0x04, 0x0c, 0x04,
+      0x01, 0x03, 0x31, 0x0b, 0x2c, 0x04, 0x1a, 0x06, 0x0b, 0x03, 0x80, 0xac,
+      0x06, 0x0a, 0x06, 0x21, 0x3f, 0x4c, 0x04, 0x2d, 0x03, 0x74, 0x08, 0x3c,
+      0x03, 0x0f, 0x03, 0x3c, 0x07, 0x38, 0x08, 0x2b, 0x05, 0x82, 0xff, 0x11,
+      0x18, 0x08, 0x2f, 0x11, 0x2d, 0x03, 0x20, 0x10, 0x21, 0x0f, 0x80, 0x8c,
+      0x04, 0x82, 0x97, 0x19, 0x0b, 0x15, 0x88, 0x94, 0x05, 0x2f, 0x05, 0x3b,
+      0x07, 0x02, 0x0e, 0x18, 0x09, 0x80, 0xb3, 0x2d, 0x74, 0x0c, 0x80, 0xd6,
+      0x1a, 0x0c, 0x05, 0x80, 0xff, 0x05, 0x80, 0xdf, 0x0c, 0xee, 0x0d, 0x03,
+      0x84, 0x8d, 0x03, 0x37, 0x09, 0x81, 0x5c, 0x14, 0x80, 0xb8, 0x08, 0x80,
+      0xcb, 0x2a, 0x38, 0x03, 0x0a, 0x06, 0x38, 0x08, 0x46, 0x08, 0x0c, 0x06,
+      0x74, 0x0b, 0x1e, 0x03, 0x5a, 0x04, 0x59, 0x09, 0x80, 0x83, 0x18, 0x1c,
+      0x0a, 0x16, 0x09, 0x4c, 0x04, 0x80, 0x8a, 0x06, 0xab, 0xa4, 0x0c, 0x17,
+      0x04, 0x31, 0xa1, 0x04, 0x81, 0xda, 0x26, 0x07, 0x0c, 0x05, 0x05, 0x80,
+      0xa5, 0x11, 0x81, 0x6d, 0x10, 0x78, 0x28, 0x2a, 0x06, 0x4c, 0x04, 0x80,
+      0x8d, 0x04, 0x80, 0xbe, 0x03, 0x1b, 0x03, 0x0f, 0x0d,
+  };
+  static constexpr unsigned char normal1[] = {
+      0x5e, 0x22, 0x7b, 0x05, 0x03, 0x04, 0x2d, 0x03, 0x66, 0x03, 0x01, 0x2f,
+      0x2e, 0x80, 0x82, 0x1d, 0x03, 0x31, 0x0f, 0x1c, 0x04, 0x24, 0x09, 0x1e,
+      0x05, 0x2b, 0x05, 0x44, 0x04, 0x0e, 0x2a, 0x80, 0xaa, 0x06, 0x24, 0x04,
+      0x24, 0x04, 0x28, 0x08, 0x34, 0x0b, 0x01, 0x80, 0x90, 0x81, 0x37, 0x09,
+      0x16, 0x0a, 0x08, 0x80, 0x98, 0x39, 0x03, 0x63, 0x08, 0x09, 0x30, 0x16,
+      0x05, 0x21, 0x03, 0x1b, 0x05, 0x01, 0x40, 0x38, 0x04, 0x4b, 0x05, 0x2f,
+      0x04, 0x0a, 0x07, 0x09, 0x07, 0x40, 0x20, 0x27, 0x04, 0x0c, 0x09, 0x36,
+      0x03, 0x3a, 0x05, 0x1a, 0x07, 0x04, 0x0c, 0x07, 0x50, 0x49, 0x37, 0x33,
+      0x0d, 0x33, 0x07, 0x2e, 0x08, 0x0a, 0x81, 0x26, 0x52, 0x4e, 0x28, 0x08,
+      0x2a, 0x56, 0x1c, 0x14, 0x17, 0x09, 0x4e, 0x04, 0x1e, 0x0f, 0x43, 0x0e,
+      0x19, 0x07, 0x0a, 0x06, 0x48, 0x08, 0x27, 0x09, 0x75, 0x0b, 0x3f, 0x41,
+      0x2a, 0x06, 0x3b, 0x05, 0x0a, 0x06, 0x51, 0x06, 0x01, 0x05, 0x10, 0x03,
+      0x05, 0x80, 0x8b, 0x62, 0x1e, 0x48, 0x08, 0x0a, 0x80, 0xa6, 0x5e, 0x22,
+      0x45, 0x0b, 0x0a, 0x06, 0x0d, 0x13, 0x39, 0x07, 0x0a, 0x36, 0x2c, 0x04,
+      0x10, 0x80, 0xc0, 0x3c, 0x64, 0x53, 0x0c, 0x48, 0x09, 0x0a, 0x46, 0x45,
+      0x1b, 0x48, 0x08, 0x53, 0x1d, 0x39, 0x81, 0x07, 0x46, 0x0a, 0x1d, 0x03,
+      0x47, 0x49, 0x37, 0x03, 0x0e, 0x08, 0x0a, 0x06, 0x39, 0x07, 0x0a, 0x81,
+      0x36, 0x19, 0x80, 0xb7, 0x01, 0x0f, 0x32, 0x0d, 0x83, 0x9b, 0x66, 0x75,
+      0x0b, 0x80, 0xc4, 0x8a, 0xbc, 0x84, 0x2f, 0x8f, 0xd1, 0x82, 0x47, 0xa1,
+      0xb9, 0x82, 0x39, 0x07, 0x2a, 0x04, 0x02, 0x60, 0x26, 0x0a, 0x46, 0x0a,
+      0x28, 0x05, 0x13, 0x82, 0xb0, 0x5b, 0x65, 0x4b, 0x04, 0x39, 0x07, 0x11,
+      0x40, 0x05, 0x0b, 0x02, 0x0e, 0x97, 0xf8, 0x08, 0x84, 0xd6, 0x2a, 0x09,
+      0xa2, 0xf7, 0x81, 0x1f, 0x31, 0x03, 0x11, 0x04, 0x08, 0x81, 0x8c, 0x89,
+      0x04, 0x6b, 0x05, 0x0d, 0x03, 0x09, 0x07, 0x10, 0x93, 0x60, 0x80, 0xf6,
+      0x0a, 0x73, 0x08, 0x6e, 0x17, 0x46, 0x80, 0x9a, 0x14, 0x0c, 0x57, 0x09,
+      0x19, 0x80, 0x87, 0x81, 0x47, 0x03, 0x85, 0x42, 0x0f, 0x15, 0x85, 0x50,
+      0x2b, 0x80, 0xd5, 0x2d, 0x03, 0x1a, 0x04, 0x02, 0x81, 0x70, 0x3a, 0x05,
+      0x01, 0x85, 0x00, 0x80, 0xd7, 0x29, 0x4c, 0x04, 0x0a, 0x04, 0x02, 0x83,
+      0x11, 0x44, 0x4c, 0x3d, 0x80, 0xc2, 0x3c, 0x06, 0x01, 0x04, 0x55, 0x05,
+      0x1b, 0x34, 0x02, 0x81, 0x0e, 0x2c, 0x04, 0x64, 0x0c, 0x56, 0x0a, 0x80,
+      0xae, 0x38, 0x1d, 0x0d, 0x2c, 0x04, 0x09, 0x07, 0x02, 0x0e, 0x06, 0x80,
+      0x9a, 0x83, 0xd8, 0x08, 0x0d, 0x03, 0x0d, 0x03, 0x74, 0x0c, 0x59, 0x07,
+      0x0c, 0x14, 0x0c, 0x04, 0x38, 0x08, 0x0a, 0x06, 0x28, 0x08, 0x22, 0x4e,
+      0x81, 0x54, 0x0c, 0x15, 0x03, 0x03, 0x05, 0x07, 0x09, 0x19, 0x07, 0x07,
+      0x09, 0x03, 0x0d, 0x07, 0x29, 0x80, 0xcb, 0x25, 0x0a, 0x84, 0x06,
+  };
+  auto lower = static_cast<uint16_t>(cp);
+  if (cp < 0x10000) {
+    return is_printable(lower, singletons0,
+                        sizeof(singletons0) / sizeof(*singletons0),
+                        singletons0_lower, normal0, sizeof(normal0));
+  }
+  if (cp < 0x20000) {
+    return is_printable(lower, singletons1,
+                        sizeof(singletons1) / sizeof(*singletons1),
+                        singletons1_lower, normal1, sizeof(normal1));
+  }
+  if (0x2a6de <= cp && cp < 0x2a700) return false;
+  if (0x2b735 <= cp && cp < 0x2b740) return false;
+  if (0x2b81e <= cp && cp < 0x2b820) return false;
+  if (0x2cea2 <= cp && cp < 0x2ceb0) return false;
+  if (0x2ebe1 <= cp && cp < 0x2f800) return false;
+  if (0x2fa1e <= cp && cp < 0x30000) return false;
+  if (0x3134b <= cp && cp < 0xe0100) return false;
+  if (0xe01f0 <= cp && cp < 0x110000) return false;
+  return cp < 0x110000;
+}
+
+inline auto needs_escape(uint32_t cp) -> bool {
+  return cp < 0x20 || cp == 0x7f || cp == '"' || cp == '\\' ||
+         !is_printable(cp);
+}
+
+template <typename Char> struct find_escape_result {
+  const Char* begin;
+  const Char* end;
+  uint32_t cp;
+};
+
+template <typename Char>
+auto find_escape(const Char* begin, const Char* end)
+    -> find_escape_result<Char> {
+  for (; begin != end; ++begin) {
+    auto cp = static_cast<typename std::make_unsigned<Char>::type>(*begin);
+    if (sizeof(Char) == 1 && cp >= 0x80) continue;
+    if (needs_escape(cp)) return {begin, begin + 1, cp};
+  }
+  return {begin, nullptr, 0};
+}
+
+inline auto find_escape(const char* begin, const char* end)
+    -> find_escape_result<char> {
+  if (!is_utf8()) return find_escape<char>(begin, end);
+  auto result = find_escape_result<char>{end, nullptr, 0};
+  for_each_codepoint(string_view(begin, to_unsigned(end - begin)),
+                     [&](uint32_t cp, string_view sv) {
+                       if (needs_escape(cp)) {
+                         result = {sv.begin(), sv.end(), cp};
+                         return false;
+                       }
+                       return true;
+                     });
+  return result;
+}
+
+template <typename Char, typename OutputIt>
+auto write_range_entry(OutputIt out, basic_string_view<Char> str) -> OutputIt {
   *out++ = '"';
-  out = write<Char>(out, v);
+  auto begin = str.begin(), end = str.end();
+  do {
+    auto escape = find_escape(begin, end);
+    out = copy_str<Char>(begin, escape.begin, out);
+    begin = escape.end;
+    if (!begin) break;
+    auto c = static_cast<Char>(escape.cp);
+    switch (escape.cp) {
+    case '\n':
+      *out++ = '\\';
+      c = 'n';
+      break;
+    case '\r':
+      *out++ = '\\';
+      c = 'r';
+      break;
+    case '\t':
+      *out++ = '\\';
+      c = 't';
+      break;
+    case '"':
+      FMT_FALLTHROUGH;
+    case '\\':
+      *out++ = '\\';
+      break;
+    default:
+      if (is_utf8()) {
+        if (escape.cp < 0x100) {
+          out = format_to(out, "\\x{:02x}", escape.cp);
+          continue;
+        }
+        if (escape.cp < 0x10000) {
+          out = format_to(out, "\\u{:04x}", escape.cp);
+          continue;
+        }
+        if (escape.cp < 0x110000) {
+          out = format_to(out, "\\U{:08x}", escape.cp);
+          continue;
+        }
+      }
+      for (Char escape_char : basic_string_view<Char>(
+               escape.begin, to_unsigned(escape.end - escape.begin))) {
+        out = format_to(
+            out, "\\x{:02x}",
+            static_cast<typename std::make_unsigned<Char>::type>(escape_char));
+      }
+      continue;
+    }
+    *out++ = c;
+  } while (begin != end);
   *out++ = '"';
   return out;
 }
 
+template <typename Char, typename OutputIt, typename T,
+          FMT_ENABLE_IF(std::is_convertible<T, std_string_view<char>>::value)>
+inline auto write_range_entry(OutputIt out, const T& str) -> OutputIt {
+  auto sv = std_string_view<Char>(str);
+  return write_range_entry<Char>(out, basic_string_view<Char>(sv));
+}
+
 template <typename Char, typename OutputIt, typename Arg,
           FMT_ENABLE_IF(std::is_same<Arg, Char>::value)>
 OutputIt write_range_entry(OutputIt out, const Arg v) {
@@ -288,43 +547,37 @@ template <typename T> struct is_tuple_like {
 template <typename TupleT, typename Char>
 struct formatter<TupleT, Char, enable_if_t<fmt::is_tuple_like<TupleT>::value>> {
  private:
-  // C++11 generic lambda for format()
+  // C++11 generic lambda for format().
   template <typename FormatContext> struct format_each {
     template <typename T> void operator()(const T& v) {
       if (i > 0) out = detail::write_delimiter(out);
       out = detail::write_range_entry<Char>(out, v);
       ++i;
     }
-    formatting_tuple<Char>& formatting;
-    size_t& i;
-    typename std::add_lvalue_reference<
-        decltype(std::declval<FormatContext>().out())>::type out;
+    int i;
+    typename FormatContext::iterator& out;
   };
 
  public:
-  formatting_tuple<Char> formatting;
-
   template <typename ParseContext>
   FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {
-    return formatting.parse(ctx);
+    return ctx.begin();
   }
 
   template <typename FormatContext = format_context>
   auto format(const TupleT& values, FormatContext& ctx) -> decltype(ctx.out()) {
     auto out = ctx.out();
-    size_t i = 0;
-
-    detail::copy(formatting.prefix, out);
-    detail::for_each(values, format_each<FormatContext>{formatting, i, out});
-    detail::copy(formatting.postfix, out);
-
-    return ctx.out();
+    *out++ = '(';
+    detail::for_each(values, format_each<FormatContext>{0, out});
+    *out++ = ')';
+    return out;
   }
 };
 
 template <typename T, typename Char> struct is_range {
   static FMT_CONSTEXPR_DECL const bool value =
       detail::is_range_<T>::value && !detail::is_std_string_like<T>::value &&
+      !detail::is_map<T>::value &&
       !std::is_convertible<T, std::basic_string<Char>>::value &&
       !std::is_constructible<detail::std_string_view<Char>, T>::value;
 };
@@ -334,32 +587,80 @@ struct formatter<
     T, Char,
     enable_if_t<
         fmt::is_range<T, Char>::value
-// Workaround a bug in MSVC 2017 and earlier.
-#if !FMT_MSC_VER || FMT_MSC_VER >= 1927
-        && (has_formatter<detail::value_type<T>, format_context>::value ||
+// Workaround a bug in MSVC 2019 and earlier.
+#if !FMT_MSC_VER
+        && (is_formattable<detail::value_type<T>, Char>::value ||
             detail::has_fallback_formatter<detail::value_type<T>, Char>::value)
 #endif
         >> {
-  formatting_range<Char> formatting;
-
   template <typename ParseContext>
   FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {
-    return formatting.parse(ctx);
+    return ctx.begin();
   }
 
-  template <typename FormatContext>
-  typename FormatContext::iterator format(const T& values, FormatContext& ctx) {
-    auto out = detail::copy(formatting.prefix, ctx.out());
-    size_t i = 0;
-    auto view = detail::range_to_view<T>::view(values);
-    auto it = view.begin();
-    auto end = view.end();
+  template <
+      typename FormatContext, typename U,
+      FMT_ENABLE_IF(
+          std::is_same<U, conditional_t<detail::has_const_begin_end<T>::value,
+                                        const T, T>>::value)>
+  auto format(U& range, FormatContext& ctx) -> decltype(ctx.out()) {
+#ifdef FMT_DEPRECATED_BRACED_RANGES
+    Char prefix = '{';
+    Char postfix = '}';
+#else
+    Char prefix = detail::is_set<T>::value ? '{' : '[';
+    Char postfix = detail::is_set<T>::value ? '}' : ']';
+#endif
+    auto out = ctx.out();
+    *out++ = prefix;
+    int i = 0;
+    auto it = std::begin(range);
+    auto end = std::end(range);
     for (; it != end; ++it) {
       if (i > 0) out = detail::write_delimiter(out);
       out = detail::write_range_entry<Char>(out, *it);
       ++i;
     }
-    return detail::copy(formatting.postfix, out);
+    *out++ = postfix;
+    return out;
+  }
+};
+
+template <typename T, typename Char>
+struct formatter<
+    T, Char,
+    enable_if_t<
+        detail::is_map<T>::value
+// Workaround a bug in MSVC 2019 and earlier.
+#if !FMT_MSC_VER
+        && (is_formattable<detail::value_type<T>, Char>::value ||
+            detail::has_fallback_formatter<detail::value_type<T>, Char>::value)
+#endif
+        >> {
+  template <typename ParseContext>
+  FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {
+    return ctx.begin();
+  }
+
+  template <
+      typename FormatContext, typename U,
+      FMT_ENABLE_IF(
+          std::is_same<U, conditional_t<detail::has_const_begin_end<T>::value,
+                                        const T, T>>::value)>
+  auto format(U& map, FormatContext& ctx) -> decltype(ctx.out()) {
+    auto out = ctx.out();
+    *out++ = '{';
+    int i = 0;
+    for (const auto& item : map) {
+      if (i > 0) out = detail::write_delimiter(out);
+      out = detail::write_range_entry<Char>(out, item.first);
+      *out++ = ':';
+      *out++ = ' ';
+      out = detail::write_range_entry<Char>(out, item.second);
+      ++i;
+    }
+    *out++ = '}';
+    return out;
   }
 };
 
@@ -374,45 +675,70 @@ template <typename Char, typename... T> struct tuple_join_view : detail::view {
 template <typename Char, typename... T>
 using tuple_arg_join = tuple_join_view<Char, T...>;
 
+// Define FMT_TUPLE_JOIN_SPECIFIERS to enable experimental format specifiers
+// support in tuple_join. It is disabled by default because of issues with
+// the dynamic width and precision.
+#ifndef FMT_TUPLE_JOIN_SPECIFIERS
+#  define FMT_TUPLE_JOIN_SPECIFIERS 0
+#endif
+
 template <typename Char, typename... T>
 struct formatter<tuple_join_view<Char, T...>, Char> {
   template <typename ParseContext>
   FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {
-    return ctx.begin();
+    return do_parse(ctx, std::integral_constant<size_t, sizeof...(T)>());
   }
 
   template <typename FormatContext>
-  auto format(const tuple_join_view<Char, T...>& value, FormatContext& ctx) ->
-      typename FormatContext::iterator {
-    return format(value, ctx, detail::make_index_sequence<sizeof...(T)>{});
+  auto format(const tuple_join_view<Char, T...>& value,
+              FormatContext& ctx) const -> typename FormatContext::iterator {
+    return do_format(value, ctx,
+                     std::integral_constant<size_t, sizeof...(T)>());
   }
 
  private:
-  template <typename FormatContext, size_t... N>
-  auto format(const tuple_join_view<Char, T...>& value, FormatContext& ctx,
-              detail::index_sequence<N...>) ->
-      typename FormatContext::iterator {
-    return format_args(value, ctx, std::get<N>(value.tuple)...);
+  std::tuple<formatter<typename std::decay<T>::type, Char>...> formatters_;
+
+  template <typename ParseContext>
+  FMT_CONSTEXPR auto do_parse(ParseContext& ctx,
+                              std::integral_constant<size_t, 0>)
+      -> decltype(ctx.begin()) {
+    return ctx.begin();
+  }
+
+  template <typename ParseContext, size_t N>
+  FMT_CONSTEXPR auto do_parse(ParseContext& ctx,
+                              std::integral_constant<size_t, N>)
+      -> decltype(ctx.begin()) {
+    auto end = ctx.begin();
+#if FMT_TUPLE_JOIN_SPECIFIERS
+    end = std::get<sizeof...(T) - N>(formatters_).parse(ctx);
+    if (N > 1) {
+      auto end1 = do_parse(ctx, std::integral_constant<size_t, N - 1>());
+      if (end != end1)
+        FMT_THROW(format_error("incompatible format specs for tuple elements"));
+    }
+#endif
+    return end;
   }
 
   template <typename FormatContext>
-  auto format_args(const tuple_join_view<Char, T...>&, FormatContext& ctx) ->
+  auto do_format(const tuple_join_view<Char, T...>&, FormatContext& ctx,
+                 std::integral_constant<size_t, 0>) const ->
       typename FormatContext::iterator {
-    // NOTE: for compilers that support C++17, this empty function instantiation
-    // can be replaced with a constexpr branch in the variadic overload.
     return ctx.out();
   }
 
-  template <typename FormatContext, typename Arg, typename... Args>
-  auto format_args(const tuple_join_view<Char, T...>& value, FormatContext& ctx,
-                   const Arg& arg, const Args&... args) ->
+  template <typename FormatContext, size_t N>
+  auto do_format(const tuple_join_view<Char, T...>& value, FormatContext& ctx,
+                 std::integral_constant<size_t, N>) const ->
       typename FormatContext::iterator {
-    using base = formatter<typename std::decay<Arg>::type, Char>;
-    auto out = base().format(arg, ctx);
-    if (sizeof...(Args) > 0) {
+    auto out = std::get<sizeof...(T) - N>(formatters_)
+                   .format(std::get<sizeof...(T) - N>(value.tuple), ctx);
+    if (N > 1) {
       out = std::copy(value.sep.begin(), value.sep.end(), out);
       ctx.advance_to(out);
-      return format_args(value, ctx, args...);
+      return do_format(value, ctx, std::integral_constant<size_t, N - 1>());
     }
     return out;
   }

externals/fmt/include/fmt/xchar.h

@@ -5,8 +5,8 @@
 //
 // For the license information refer to format.h.
 
-#ifndef FMT_WCHAR_H_
-#define FMT_WCHAR_H_
+#ifndef FMT_XCHAR_H_
+#define FMT_XCHAR_H_
 
 #include <cwchar>
 #include <tuple>
@@ -142,7 +142,7 @@ FMT_DEPRECATED auto format_to(basic_memory_buffer<Char, SIZE, Allocator>& buf,
                               const S& format_str, Args&&... args) ->
     typename buffer_context<Char>::iterator {
   const auto& vargs = fmt::make_args_checked<Args...>(format_str, args...);
-  detail::vformat_to(buf, to_string_view(format_str), vargs);
+  detail::vformat_to(buf, to_string_view(format_str), vargs, {});
   return detail::buffer_appender<Char>(buf);
 }
 
@@ -217,11 +217,11 @@ inline void vprint(wstring_view fmt, wformat_args args) {
 
 template <typename... T>
 void print(std::FILE* f, wformat_string<T...> fmt, T&&... args) {
-  return vprint(f, wstring_view(fmt), make_wformat_args(args...));
+  return vprint(f, wstring_view(fmt), fmt::make_wformat_args(args...));
 }
 
 template <typename... T> void print(wformat_string<T...> fmt, T&&... args) {
-  return vprint(wstring_view(fmt), make_wformat_args(args...));
+  return vprint(wstring_view(fmt), fmt::make_wformat_args(args...));
 }
 
 /**
@@ -233,4 +233,4 @@ template <typename T> inline auto to_wstring(const T& value) -> std::wstring {
 FMT_MODULE_EXPORT_END
 FMT_END_NAMESPACE
 
-#endif  // FMT_WCHAR_H_
+#endif  // FMT_XCHAR_H_

externals/fmt/src/fmt.cc

@@ -79,7 +79,6 @@ export module fmt;
 #define FMT_END_DETAIL_NAMESPACE \
   }                              \
   export {
-
 // all library-provided declarations and definitions
 // must be in the module purview to be exported
 #include "fmt/args.h"

externals/fmt/src/format.cc

@@ -10,6 +10,52 @@
 FMT_BEGIN_NAMESPACE
 namespace detail {
 
+// DEPRECATED!
+template <typename T = void> struct basic_data {
+  FMT_API static constexpr const char digits[100][2] = {
+      {'0', '0'}, {'0', '1'}, {'0', '2'}, {'0', '3'}, {'0', '4'}, {'0', '5'},
+      {'0', '6'}, {'0', '7'}, {'0', '8'}, {'0', '9'}, {'1', '0'}, {'1', '1'},
+      {'1', '2'}, {'1', '3'}, {'1', '4'}, {'1', '5'}, {'1', '6'}, {'1', '7'},
+      {'1', '8'}, {'1', '9'}, {'2', '0'}, {'2', '1'}, {'2', '2'}, {'2', '3'},
+      {'2', '4'}, {'2', '5'}, {'2', '6'}, {'2', '7'}, {'2', '8'}, {'2', '9'},
+      {'3', '0'}, {'3', '1'}, {'3', '2'}, {'3', '3'}, {'3', '4'}, {'3', '5'},
+      {'3', '6'}, {'3', '7'}, {'3', '8'}, {'3', '9'}, {'4', '0'}, {'4', '1'},
+      {'4', '2'}, {'4', '3'}, {'4', '4'}, {'4', '5'}, {'4', '6'}, {'4', '7'},
+      {'4', '8'}, {'4', '9'}, {'5', '0'}, {'5', '1'}, {'5', '2'}, {'5', '3'},
+      {'5', '4'}, {'5', '5'}, {'5', '6'}, {'5', '7'}, {'5', '8'}, {'5', '9'},
+      {'6', '0'}, {'6', '1'}, {'6', '2'}, {'6', '3'}, {'6', '4'}, {'6', '5'},
+      {'6', '6'}, {'6', '7'}, {'6', '8'}, {'6', '9'}, {'7', '0'}, {'7', '1'},
+      {'7', '2'}, {'7', '3'}, {'7', '4'}, {'7', '5'}, {'7', '6'}, {'7', '7'},
+      {'7', '8'}, {'7', '9'}, {'8', '0'}, {'8', '1'}, {'8', '2'}, {'8', '3'},
+      {'8', '4'}, {'8', '5'}, {'8', '6'}, {'8', '7'}, {'8', '8'}, {'8', '9'},
+      {'9', '0'}, {'9', '1'}, {'9', '2'}, {'9', '3'}, {'9', '4'}, {'9', '5'},
+      {'9', '6'}, {'9', '7'}, {'9', '8'}, {'9', '9'}};
+  FMT_API static constexpr const char hex_digits[] = "0123456789abcdef";
+  FMT_API static constexpr const char signs[4] = {0, '-', '+', ' '};
+  FMT_API static constexpr const char left_padding_shifts[5] = {31, 31, 0, 1,
+                                                                0};
+  FMT_API static constexpr const char right_padding_shifts[5] = {0, 31, 0, 1,
+                                                                 0};
+  FMT_API static constexpr const unsigned prefixes[4] = {0, 0, 0x1000000u | '+',
+                                                         0x1000000u | ' '};
+};
+
+#ifdef FMT_SHARED
+// Required for -flto, -fivisibility=hidden and -shared to work
+extern template struct basic_data<void>;
+#endif
+
+#if __cplusplus < 201703L
+// DEPRECATED! These are here only for ABI compatiblity.
+template <typename T> constexpr const char basic_data<T>::digits[][2];
+template <typename T> constexpr const char basic_data<T>::hex_digits[];
+template <typename T> constexpr const char basic_data<T>::signs[];
+template <typename T> constexpr const char basic_data<T>::left_padding_shifts[];
+template <typename T>
+constexpr const char basic_data<T>::right_padding_shifts[];
+template <typename T> constexpr const unsigned basic_data<T>::prefixes[];
+#endif
+
 template <typename T>
 int format_float(char* buf, std::size_t size, const char* format, int precision,
                  T value) {
@@ -47,6 +93,9 @@ template FMT_API char detail::decimal_point_impl(locale_ref);
 
 template FMT_API void detail::buffer<char>::append(const char*, const char*);
 
+// DEPRECATED!
+// There is no correspondent extern template in format.h because of
+// incompatibility between clang and gcc (#2377).
 template FMT_API void detail::vformat_to(
     detail::buffer<char>&, string_view,
     basic_format_args<FMT_BUFFER_CONTEXT(char)>, detail::locale_ref);

externals/fmt/src/os.cc

@@ -26,19 +26,17 @@
 #    endif
 #    include <io.h>
 
-#    define O_CREAT _O_CREAT
-#    define O_TRUNC _O_TRUNC
-
 #    ifndef S_IRUSR
 #      define S_IRUSR _S_IREAD
 #    endif
-
 #    ifndef S_IWUSR
 #      define S_IWUSR _S_IWRITE
 #    endif
-
-#    ifdef __MINGW32__
-#      define _SH_DENYNO 0x40
+#    ifndef S_IRGRP
+#      define S_IRGRP 0
+#    endif
+#    ifndef S_IROTH
+#      define S_IROTH 0
 #    endif
 #  endif  // _WIN32
 #endif    // FMT_USE_FCNTL
@@ -213,7 +211,10 @@ int buffered_file::fileno() const {
 
 #if FMT_USE_FCNTL
 file::file(cstring_view path, int oflag) {
-  int mode = S_IRUSR | S_IWUSR;
+#  ifdef _WIN32
+  using mode_t = int;
+#  endif
+  mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH;
 #  if defined(_WIN32) && !defined(__MINGW32__)
   fd_ = -1;
   FMT_POSIX_CALL(sopen_s(&fd_, path.c_str(), oflag, _SH_DENYNO, mode));

externals/fmt/support/bazel/.bazelrc

@@ -0,0 +1 @@
+build --symlink_prefix=/ # Out of source build

externals/fmt/support/bazel/.bazelversion

@@ -0,0 +1 @@
+4.2.1

externals/fmt/support/bazel/BUILD.bazel

@@ -0,0 +1,29 @@
+cc_library(
+    name = "fmt",
+    srcs = [
+        #"src/fmt.cc", # No C++ module support
+        "src/format.cc",
+        "src/os.cc",
+    ],
+    hdrs = [
+        "include/fmt/args.h",
+        "include/fmt/chrono.h",
+        "include/fmt/color.h",
+        "include/fmt/compile.h",
+        "include/fmt/core.h",
+        "include/fmt/format.h",
+        "include/fmt/format-inl.h",
+        "include/fmt/locale.h",
+        "include/fmt/os.h",
+        "include/fmt/ostream.h",
+        "include/fmt/printf.h",
+        "include/fmt/ranges.h",
+        "include/fmt/xchar.h",
+    ],
+    includes = [
+        "include",
+        "src",
+    ],
+    strip_include_prefix = "include",
+    visibility = ["//visibility:public"],
+)

externals/fmt/support/bazel/README.md

@@ -0,0 +1,73 @@
+# Bazel support
+
+To get [Bazel](https://bazel.build/) working with {fmt} you can copy the files `BUILD.bazel`, `WORKSPACE.bazel`, `.bazelrc`, and `.bazelversion` from this folder (`support/bazel`) to the root folder of this project. This way {fmt} gets bazelized and can be used with Bazel (e.g. doing a `bazel build //...` on {fmt}). 
+
+## Using {fmt} as a dependency
+
+The following minimal example shows how to use {fmt} as a dependency within a Bazel project.
+
+The following file structure is assumed:
+
+```
+example
+├── BUILD.bazel
+├── main.cpp
+└── WORKSPACE.bazel
+```
+
+*main.cpp*:
+
+```c++
+#include "fmt/core.h"
+
+int main() {
+  fmt::print("The answer is {}\n", 42);
+}
+```
+
+The expected output of this example is `The answer is 42`.
+
+*WORKSPACE.bazel*:
+
+```python
+load("@bazel_tools//tools/build_defs/repo:git.bzl", "git_repository")
+
+git_repository(
+    name = "fmt",
+    branch = "master",
+    remote = "https://github.com/fmtlib/fmt",
+    patch_cmds = [
+        "mv support/bazel/.bazelrc .bazelrc",
+        "mv support/bazel/.bazelversion .bazelversion",
+        "mv support/bazel/BUILD.bazel BUILD.bazel",
+        "mv support/bazel/WORKSPACE.bazel WORKSPACE.bazel",
+    ],
+    # Windows-related patch commands are only needed in the case MSYS2 is not installed.
+    # More details about the installation process of MSYS2 on Windows systems can be found here:
+    # https://docs.bazel.build/versions/main/install-windows.html#installing-compilers-and-language-runtimes
+    # Even if MSYS2 is installed the Windows related patch commands can still be used.
+    patch_cmds_win = [
+        "Move-Item -Path support/bazel/.bazelrc -Destination .bazelrc",
+        "Move-Item -Path support/bazel/.bazelversion -Destination .bazelversion",
+        "Move-Item -Path support/bazel/BUILD.bazel -Destination BUILD.bazel",
+        "Move-Item -Path support/bazel/WORKSPACE.bazel -Destination WORKSPACE.bazel",
+    ],
+)
+```
+
+In the *WORKSPACE* file, the {fmt} GitHub repository is fetched. Using the attribute `patch_cmds` the  files `BUILD.bazel`, `WORKSPACE.bazel`, `.bazelrc`, and `.bazelversion` are moved to the root of the {fmt} repository. This way the {fmt} repository is recognized as a bazelized workspace. 
+
+*BUILD.bazel*:
+
+```python
+cc_binary(
+    name = "Demo",
+    srcs = ["main.cpp"],
+    deps = ["@fmt"],
+)
+```
+
+The *BUILD* file defines a binary named `Demo` that has a dependency to {fmt}.
+
+To execute the binary you can run `bazel run //:Demo`.
+

externals/fmt/support/bazel/WORKSPACE.bazel

@@ -0,0 +1 @@
+workspace(name = "fmt")

externals/fmt/support/manage.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """Manage site and releases.
 
@@ -163,6 +163,13 @@ def update_site(env):
                 if version.startswith('7.'):
                     b.data = b.data.replace(', std::size_t', ', size_t')
                     b.data = b.data.replace('join(It, It', 'join(It, Sentinel')
+                if version.startswith('7.1.'):
+                    b.data = b.data.replace(', std::size_t', ', size_t')
+                    b.data = b.data.replace('join(It, It', 'join(It, Sentinel')
+                    b.data = b.data.replace(
+                        'fmt::format_to(OutputIt, const S&, Args&&...)',
+                        'fmt::format_to(OutputIt, const S&, Args&&...) -> ' +
+                        'typename std::enable_if<enable, OutputIt>::type')
                 b.data = b.data.replace('aa long', 'a long')
                 b.data = b.data.replace('serveral', 'several')
                 if version.startswith('6.2.'):
@@ -233,7 +240,7 @@ def release(args):
     # Update the version in the changelog.
     title_len = 0
     for line in fileinput.input(changelog_path, inplace=True):
-        if line.decode('utf-8').startswith(version + ' - TBD'):
+        if line.startswith(version + ' - TBD'):
             line = version + ' - ' + datetime.date.today().isoformat()
             title_len = len(line)
             line += '\n'
@@ -263,9 +270,9 @@ def release(args):
 
     # Create a release on GitHub.
     fmt_repo.push('origin', 'release')
-    params = {'access_token': os.getenv('FMT_TOKEN')}
+    auth_headers = {'Authorization': 'token ' + os.getenv('FMT_TOKEN')}
     r = requests.post('https://api.github.com/repos/fmtlib/fmt/releases',
-                      params=params,
+                      headers=auth_headers,
                       data=json.dumps({'tag_name': version,
                                        'target_commitish': 'release',
                                        'body': changes, 'draft': True}))
@@ -276,8 +283,8 @@ def release(args):
     package = 'fmt-{}.zip'.format(version)
     r = requests.post(
         '{}/{}/assets?name={}'.format(uploads_url, id, package),
-        headers={'Content-Type': 'application/zip'},
-        params=params, data=open('build/fmt/' + package, 'rb'))
+        headers={'Content-Type': 'application/zip'} | auth_headers,
+        data=open('build/fmt/' + package, 'rb'))
     if r.status_code != 201:
         raise Exception('Failed to upload an asset ' + str(r))
 

externals/fmt/support/printable.py

@@ -0,0 +1,201 @@
+#!/usr/bin/env python3
+
+# This script is based on
+# https://github.com/rust-lang/rust/blob/master/library/core/src/unicode/printable.py
+# distributed under https://github.com/rust-lang/rust/blob/master/LICENSE-MIT.
+
+# This script uses the following Unicode tables:
+# - UnicodeData.txt
+
+
+from collections import namedtuple
+import csv
+import os
+import subprocess
+
+NUM_CODEPOINTS=0x110000
+
+def to_ranges(iter):
+    current = None
+    for i in iter:
+        if current is None or i != current[1] or i in (0x10000, 0x20000):
+            if current is not None:
+                yield tuple(current)
+            current = [i, i + 1]
+        else:
+            current[1] += 1
+    if current is not None:
+        yield tuple(current)
+
+def get_escaped(codepoints):
+    for c in codepoints:
+        if (c.class_ or "Cn") in "Cc Cf Cs Co Cn Zl Zp Zs".split() and c.value != ord(' '):
+            yield c.value
+
+def get_file(f):
+    try:
+        return open(os.path.basename(f))
+    except FileNotFoundError:
+        subprocess.run(["curl", "-O", f], check=True)
+        return open(os.path.basename(f))
+
+Codepoint = namedtuple('Codepoint', 'value class_')
+
+def get_codepoints(f):
+    r = csv.reader(f, delimiter=";")
+    prev_codepoint = 0
+    class_first = None
+    for row in r:
+        codepoint = int(row[0], 16)
+        name = row[1]
+        class_ = row[2]
+
+        if class_first is not None:
+            if not name.endswith("Last>"):
+                raise ValueError("Missing Last after First")
+
+        for c in range(prev_codepoint + 1, codepoint):
+            yield Codepoint(c, class_first)
+
+        class_first = None
+        if name.endswith("First>"):
+            class_first = class_
+
+        yield Codepoint(codepoint, class_)
+        prev_codepoint = codepoint
+
+    if class_first is not None:
+        raise ValueError("Missing Last after First")
+
+    for c in range(prev_codepoint + 1, NUM_CODEPOINTS):
+        yield Codepoint(c, None)
+
+def compress_singletons(singletons):
+    uppers = [] # (upper, # items in lowers)
+    lowers = []
+
+    for i in singletons:
+        upper = i >> 8
+        lower = i & 0xff
+        if len(uppers) == 0 or uppers[-1][0] != upper:
+            uppers.append((upper, 1))
+        else:
+            upper, count = uppers[-1]
+            uppers[-1] = upper, count + 1
+        lowers.append(lower)
+
+    return uppers, lowers
+
+def compress_normal(normal):
+    # lengths 0x00..0x7f are encoded as 00, 01, ..., 7e, 7f
+    # lengths 0x80..0x7fff are encoded as 80 80, 80 81, ..., ff fe, ff ff
+    compressed = [] # [truelen, (truelenaux), falselen, (falselenaux)]
+
+    prev_start = 0
+    for start, count in normal:
+        truelen = start - prev_start
+        falselen = count
+        prev_start = start + count
+
+        assert truelen < 0x8000 and falselen < 0x8000
+        entry = []
+        if truelen > 0x7f:
+            entry.append(0x80 | (truelen >> 8))
+            entry.append(truelen & 0xff)
+        else:
+            entry.append(truelen & 0x7f)
+        if falselen > 0x7f:
+            entry.append(0x80 | (falselen >> 8))
+            entry.append(falselen & 0xff)
+        else:
+            entry.append(falselen & 0x7f)
+
+        compressed.append(entry)
+
+    return compressed
+
+def print_singletons(uppers, lowers, uppersname, lowersname):
+    print("  static constexpr singleton {}[] = {{".format(uppersname))
+    for u, c in uppers:
+        print("    {{{:#04x}, {}}},".format(u, c))
+    print("  };")
+    print("  static constexpr unsigned char {}[] = {{".format(lowersname))
+    for i in range(0, len(lowers), 8):
+        print("    {}".format(" ".join("{:#04x},".format(l) for l in lowers[i:i+8])))
+    print("  };")
+
+def print_normal(normal, normalname):
+    print("  static constexpr unsigned char {}[] = {{".format(normalname))
+    for v in normal:
+        print("    {}".format(" ".join("{:#04x},".format(i) for i in v)))
+    print("  };")
+
+def main():
+    file = get_file("https://www.unicode.org/Public/UNIDATA/UnicodeData.txt")
+
+    codepoints = get_codepoints(file)
+
+    CUTOFF=0x10000
+    singletons0 = []
+    singletons1 = []
+    normal0 = []
+    normal1 = []
+    extra = []
+
+    for a, b in to_ranges(get_escaped(codepoints)):
+        if a > 2 * CUTOFF:
+            extra.append((a, b - a))
+        elif a == b - 1:
+            if a & CUTOFF:
+                singletons1.append(a & ~CUTOFF)
+            else:
+                singletons0.append(a)
+        elif a == b - 2:
+            if a & CUTOFF:
+                singletons1.append(a & ~CUTOFF)
+                singletons1.append((a + 1) & ~CUTOFF)
+            else:
+                singletons0.append(a)
+                singletons0.append(a + 1)
+        else:
+            if a >= 2 * CUTOFF:
+                extra.append((a, b - a))
+            elif a & CUTOFF:
+                normal1.append((a & ~CUTOFF, b - a))
+            else:
+                normal0.append((a, b - a))
+
+    singletons0u, singletons0l = compress_singletons(singletons0)
+    singletons1u, singletons1l = compress_singletons(singletons1)
+    normal0 = compress_normal(normal0)
+    normal1 = compress_normal(normal1)
+
+    print("""\
+inline auto is_printable(uint32_t cp) -> bool {\
+""")
+    print_singletons(singletons0u, singletons0l, 'singletons0', 'singletons0_lower')
+    print_singletons(singletons1u, singletons1l, 'singletons1', 'singletons1_lower')
+    print_normal(normal0, 'normal0')
+    print_normal(normal1, 'normal1')
+    print("""\
+  auto lower = static_cast<uint16_t>(cp);
+  if (cp < 0x10000) {
+    return is_printable(lower, singletons0,
+                        sizeof(singletons0) / sizeof(*singletons0),
+                        singletons0_lower, normal0, sizeof(normal0));
+  }
+  if (cp < 0x20000) {
+    return is_printable(lower, singletons1,
+                        sizeof(singletons1) / sizeof(*singletons1),
+                        singletons1_lower, normal1, sizeof(normal1));
+  }\
+""")
+    for a, b in extra:
+        print("  if (0x{:x} <= cp && cp < 0x{:x}) return false;".format(a, a + b))
+    print("""\
+  return cp < 0x{:x};
+}}\
+""".format(NUM_CODEPOINTS))
+
+if __name__ == '__main__':
+    main()

externals/fmt/test/CMakeLists.txt

@@ -8,24 +8,21 @@ target_link_libraries(test-main gtest)
 
 include(CheckCXXCompilerFlag)
 
-# Workaround GTest bug https://github.com/google/googletest/issues/705.
-check_cxx_compiler_flag(
-  -fno-delete-null-pointer-checks HAVE_FNO_DELETE_NULL_POINTER_CHECKS)
-if (HAVE_FNO_DELETE_NULL_POINTER_CHECKS)
-  target_compile_options(test-main PUBLIC -fno-delete-null-pointer-checks)
-endif ()
-
-# Use less strict pedantic flags for the tests because GMock doesn't compile
-# cleanly with -pedantic and -std=c++98.
-if (CMAKE_COMPILER_IS_GNUCXX OR (CMAKE_CXX_COMPILER_ID MATCHES "Clang"))
-    #set(PEDANTIC_COMPILE_FLAGS -Wall -Wextra -Wno-long-long -Wno-variadic-macros)
-endif ()
-
 function(add_fmt_executable name)
   add_executable(${name} ${ARGN})
   if (MINGW)
     target_link_libraries(${name} -static-libgcc -static-libstdc++)
   endif ()
+  # (Wstringop-overflow) - [meta-bug] bogus/missing -Wstringop-overflow warnings
+  #   https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88443
+  # Bogus -Wstringop-overflow warning
+  #   https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100395
+  # [10 Regression] spurious -Wstringop-overflow writing to a trailing array plus offset
+  #   https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95353
+  if (CMAKE_CXX_COMPILER_ID MATCHES "GNU" AND
+      NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 7.0)
+    target_link_libraries(${name} -Wno-stringop-overflow)
+  endif ()
 endfunction()
 
 # Adds a test.
@@ -41,7 +38,7 @@ function(add_fmt_test name)
       set(PEDANTIC_COMPILE_FLAGS ${PEDANTIC_COMPILE_FLAGS} -Wno-weak-vtables)
     endif ()
   elseif (ADD_FMT_TEST_MODULE)
-    set(libs test-main test-module)
+    set(libs gtest test-module)
     set_source_files_properties(${name}.cc PROPERTIES OBJECT_DEPENDS test-module)
   else ()
     set(libs test-main fmt)
@@ -74,8 +71,13 @@ if (NOT (MSVC AND BUILD_SHARED_LIBS))
 endif ()
 add_fmt_test(ostream-test)
 add_fmt_test(compile-test)
+add_fmt_test(compile-fp-test HEADER_ONLY)
+if (MSVC)
+  # Without this option, MSVC returns 199711L for the __cplusplus macro.
+  target_compile_options(compile-fp-test PRIVATE /Zc:__cplusplus)
+endif()
 add_fmt_test(printf-test)
-add_fmt_test(ranges-test)
+add_fmt_test(ranges-test ranges-odr-test.cc)
 add_fmt_test(scan-test)
 add_fmt_test(unicode-test HEADER_ONLY)
 if (MSVC)
@@ -97,10 +99,12 @@ if (FMT_CAN_MODULE)
     $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/include>)
   enable_module(test-module)
 
-  add_fmt_test(module-test MODULE)
+  add_fmt_test(module-test MODULE test-main.cc)
   if (MSVC)
-    target_compile_options(test-module PRIVATE /utf-8)
-    target_compile_options(module-test PRIVATE /utf-8)
+    target_compile_options(test-module PRIVATE /utf-8 /Zc:__cplusplus
+                           /Zc:externConstexpr /Zc:inline)
+    target_compile_options(module-test PRIVATE /utf-8 /Zc:__cplusplus
+                           /Zc:externConstexpr /Zc:inline)
   endif ()
 endif ()
 
@@ -133,20 +137,14 @@ endif ()
 
 message(STATUS "FMT_PEDANTIC: ${FMT_PEDANTIC}")
 
-if (FMT_PEDANTIC AND CXX_STANDARD LESS 20)
-  # MSVC fails to compile GMock when C++17 is enabled.
-  if (FMT_HAS_VARIANT AND NOT MSVC)
-    add_fmt_test(std-format-test)
-    set_property(TARGET std-format-test PROPERTY CXX_STANDARD 17)
-  endif ()
-
+if (FMT_PEDANTIC)
   # Test that the library can be compiled with exceptions disabled.
   # -fno-exception is broken in icc: https://github.com/fmtlib/fmt/issues/822.
   if (NOT CMAKE_CXX_COMPILER_ID STREQUAL "Intel")
     check_cxx_compiler_flag(-fno-exceptions HAVE_FNO_EXCEPTIONS_FLAG)
   endif ()
   if (HAVE_FNO_EXCEPTIONS_FLAG)
-    add_library(noexception-test ../src/format.cc)
+    add_library(noexception-test ../src/format.cc noexception-test.cc)
     target_include_directories(
       noexception-test PRIVATE ${PROJECT_SOURCE_DIR}/include)
     target_compile_options(noexception-test PRIVATE -fno-exceptions)
@@ -161,7 +159,11 @@ if (FMT_PEDANTIC AND CXX_STANDARD LESS 20)
     nolocale-test PRIVATE ${PROJECT_SOURCE_DIR}/include)
   target_compile_definitions(
     nolocale-test PRIVATE FMT_STATIC_THOUSANDS_SEPARATOR=1)
+endif ()
 
+# These tests are disabled on Windows because they take too long.
+if (FMT_PEDANTIC AND NOT WIN32)
+  # Test if incorrect API usages produce compilation error.
   add_test(compile-error-test ${CMAKE_CTEST_COMMAND}
     --build-and-test
     "${CMAKE_CURRENT_SOURCE_DIR}/compile-error-test"
@@ -170,14 +172,11 @@ if (FMT_PEDANTIC AND CXX_STANDARD LESS 20)
     --build-makeprogram ${CMAKE_MAKE_PROGRAM}
     --build-options
     "-DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}"
+    "-DCMAKE_CXX_FLAGS=${CMAKE_CXX_FLAGS}"
     "-DCMAKE_CXX_STANDARD=${CMAKE_CXX_STANDARD}"
-    "-DCXX_STANDARD_FLAG=${CXX_STANDARD_FLAG}"
-    "-DPEDANTIC_COMPILE_FLAGS=${PEDANTIC_COMPILE_FLAGS}"
+    "-DFMT_DIR=${CMAKE_SOURCE_DIR}"
     "-DSUPPORTS_USER_DEFINED_LITERALS=${SUPPORTS_USER_DEFINED_LITERALS}")
-endif ()
 
-# These tests are disabled on Windows because they take too long.
-if (FMT_PEDANTIC AND NOT WIN32)
   # Test if the targets are found from the build directory.
   add_test(find-package-test ${CMAKE_CTEST_COMMAND}
     -C ${CMAKE_BUILD_TYPE}

externals/fmt/test/args-test.cc

@@ -7,10 +7,12 @@
 
 #include "fmt/args.h"
 
+#include <memory>
+
 #include "gtest/gtest.h"
 
 TEST(args_test, basic) {
-  auto store = fmt::dynamic_format_arg_store<fmt::format_context>();
+  fmt::dynamic_format_arg_store<fmt::format_context> store;
   store.push_back(42);
   store.push_back("abc1");
   store.push_back(1.5f);
@@ -19,7 +21,7 @@ TEST(args_test, basic) {
 
 TEST(args_test, strings_and_refs) {
   // Unfortunately the tests are compiled with old ABI so strings use COW.
-  auto store = fmt::dynamic_format_arg_store<fmt::format_context>();
+  fmt::dynamic_format_arg_store<fmt::format_context> store;
   char str[] = "1234567890";
   store.push_back(str);
   store.push_back(std::cref(str));
@@ -48,7 +50,7 @@ template <> struct formatter<custom_type> {
 FMT_END_NAMESPACE
 
 TEST(args_test, custom_format) {
-  auto store = fmt::dynamic_format_arg_store<fmt::format_context>();
+  fmt::dynamic_format_arg_store<fmt::format_context> store;
   auto c = custom_type();
   store.push_back(c);
   ++c.i;
@@ -77,7 +79,7 @@ template <> struct formatter<to_stringable> {
 FMT_END_NAMESPACE
 
 TEST(args_test, to_string_and_formatter) {
-  auto store = fmt::dynamic_format_arg_store<fmt::format_context>();
+  fmt::dynamic_format_arg_store<fmt::format_context> store;
   auto s = to_stringable();
   store.push_back(s);
   store.push_back(std::cref(s));
@@ -85,13 +87,13 @@ TEST(args_test, to_string_and_formatter) {
 }
 
 TEST(args_test, named_int) {
-  auto store = fmt::dynamic_format_arg_store<fmt::format_context>();
+  fmt::dynamic_format_arg_store<fmt::format_context> store;
   store.push_back(fmt::arg("a1", 42));
   EXPECT_EQ("42", fmt::vformat("{a1}", store));
 }
 
 TEST(args_test, named_strings) {
-  auto store = fmt::dynamic_format_arg_store<fmt::format_context>();
+  fmt::dynamic_format_arg_store<fmt::format_context> store;
   char str[] = "1234567890";
   store.push_back(fmt::arg("a1", str));
   store.push_back(fmt::arg("a2", std::cref(str)));
@@ -100,7 +102,7 @@ TEST(args_test, named_strings) {
 }
 
 TEST(args_test, named_arg_by_ref) {
-  auto store = fmt::dynamic_format_arg_store<fmt::format_context>();
+  fmt::dynamic_format_arg_store<fmt::format_context> store;
   char band[] = "Rolling Stones";
   store.push_back(fmt::arg("band", std::cref(band)));
   band[9] = 'c';  // Changing band affects the output.
@@ -108,7 +110,7 @@ TEST(args_test, named_arg_by_ref) {
 }
 
 TEST(args_test, named_custom_format) {
-  auto store = fmt::dynamic_format_arg_store<fmt::format_context>();
+  fmt::dynamic_format_arg_store<fmt::format_context> store;
   auto c = custom_type();
   store.push_back(fmt::arg("c1", c));
   ++c.i;
@@ -121,7 +123,7 @@ TEST(args_test, named_custom_format) {
 }
 
 TEST(args_test, clear) {
-  auto store = fmt::dynamic_format_arg_store<fmt::format_context>();
+  fmt::dynamic_format_arg_store<fmt::format_context> store;
   store.push_back(42);
 
   auto result = fmt::vformat("{}", store);
@@ -138,7 +140,7 @@ TEST(args_test, clear) {
 }
 
 TEST(args_test, reserve) {
-  auto store = fmt::dynamic_format_arg_store<fmt::format_context>();
+  fmt::dynamic_format_arg_store<fmt::format_context> store;
   store.reserve(2, 1);
   store.push_back(1.5f);
   store.push_back(fmt::arg("a1", 42));
@@ -163,7 +165,7 @@ template <> struct formatter<copy_throwable> {
 FMT_END_NAMESPACE
 
 TEST(args_test, throw_on_copy) {
-  auto store = fmt::dynamic_format_arg_store<fmt::format_context>();
+  fmt::dynamic_format_arg_store<fmt::format_context> store;
   store.push_back(std::string("foo"));
   try {
     store.push_back(copy_throwable());
@@ -171,3 +173,14 @@ TEST(args_test, throw_on_copy) {
   }
   EXPECT_EQ(fmt::vformat("{}", store), "foo");
 }
+
+TEST(args_test, move_constructor) {
+  using store_type = fmt::dynamic_format_arg_store<fmt::format_context>;
+  auto store = std::unique_ptr<store_type>(new store_type());
+  store->push_back(42);
+  store->push_back(std::string("foo"));
+  store->push_back(fmt::arg("a1", "foo"));
+  auto moved_store = std::move(*store);
+  store.reset();
+  EXPECT_EQ(fmt::vformat("{} {} {a1}", moved_store), "42 foo foo");
+}

externals/fmt/test/chrono-test.cc

@@ -7,6 +7,9 @@
 
 #include "fmt/chrono.h"
 
+#include <ctime>
+#include <vector>
+
 #include "gtest-extra.h"  // EXPECT_THROW_MSG
 #include "util.h"         // get_locale
 
@@ -38,6 +41,36 @@ auto make_second(int s) -> std::tm {
   return time;
 }
 
+std::string system_strftime(const std::string& format, const std::tm* timeptr,
+                            std::locale* locptr = nullptr) {
+  auto loc = locptr ? *locptr : std::locale::classic();
+  auto& facet = std::use_facet<std::time_put<char>>(loc);
+  std::ostringstream os;
+  os.imbue(loc);
+  facet.put(os, os, ' ', timeptr, format.c_str(),
+            format.c_str() + format.size());
+#ifdef _WIN32
+  // Workaround a bug in older versions of Universal CRT.
+  auto str = os.str();
+  if (str == "-0000") str = "+0000";
+  return str;
+#else
+  return os.str();
+#endif
+}
+
+FMT_CONSTEXPR std::tm make_tm(int year, int mon, int mday, int hour, int min,
+                              int sec) {
+  auto tm = std::tm();
+  tm.tm_sec = sec;
+  tm.tm_min = min;
+  tm.tm_hour = hour;
+  tm.tm_mday = mday;
+  tm.tm_mon = mon - 1;
+  tm.tm_year = year - 1900;
+  return tm;
+}
+
 TEST(chrono_test, format_tm) {
   auto tm = std::tm();
   tm.tm_year = 116;
@@ -48,14 +81,132 @@ TEST(chrono_test, format_tm) {
   tm.tm_sec = 33;
   EXPECT_EQ(fmt::format("The date is {:%Y-%m-%d %H:%M:%S}.", tm),
             "The date is 2016-04-25 11:22:33.");
+  EXPECT_EQ(fmt::format("{:%Y}", tm), "2016");
+  EXPECT_EQ(fmt::format("{:%C}", tm), "20");
+  EXPECT_EQ(fmt::format("{:%C%y}", tm), fmt::format("{:%Y}", tm));
+  EXPECT_EQ(fmt::format("{:%e}", tm), "25");
+  EXPECT_EQ(fmt::format("{:%D}", tm), "04/25/16");
+  EXPECT_EQ(fmt::format("{:%F}", tm), "2016-04-25");
+  EXPECT_EQ(fmt::format("{:%T}", tm), "11:22:33");
+
+  // Short year
+  tm.tm_year = 999 - 1900;
+  tm.tm_mon = 0;   // for %G
+  tm.tm_mday = 2;  // for %G
+  tm.tm_wday = 3;  // for %G
+  tm.tm_yday = 1;  // for %G
+  EXPECT_EQ(fmt::format("{:%Y}", tm), "0999");
+  EXPECT_EQ(fmt::format("{:%C%y}", tm), "0999");
+  EXPECT_EQ(fmt::format("{:%G}", tm), "0999");
+
+  tm.tm_year = 27 - 1900;
+  EXPECT_EQ(fmt::format("{:%Y}", tm), "0027");
+  EXPECT_EQ(fmt::format("{:%C%y}", tm), "0027");
+
+  // Overflow year
+  tm.tm_year = 2147483647;
+  EXPECT_EQ(fmt::format("{:%Y}", tm), "2147485547");
+
+  tm.tm_year = -2147483648;
+  EXPECT_EQ(fmt::format("{:%Y}", tm), "-2147481748");
+
+  // for week on the year
+  // https://www.cl.cam.ac.uk/~mgk25/iso-time.html
+  std::vector<std::tm> tm_list = {
+      make_tm(1975, 12, 29, 12, 14, 16),  // W01
+      make_tm(1977, 1, 2, 12, 14, 16),    // W53
+      make_tm(1999, 12, 27, 12, 14, 16),  // W52
+      make_tm(1999, 12, 31, 12, 14, 16),  // W52
+      make_tm(2000, 1, 1, 12, 14, 16),    // W52
+      make_tm(2000, 1, 2, 12, 14, 16),    // W52
+      make_tm(2000, 1, 3, 12, 14, 16)     // W1
+  };
+  const std::string iso_week_spec = "%Y-%m-%d: %G %g %V";
+  for (auto ctm : tm_list) {
+    // Calculate tm_yday, tm_wday, etc.
+    std::time_t t = std::mktime(&ctm);
+    tm = *std::localtime(&t);
+
+    auto fmt_spec = fmt::format("{{:{}}}", iso_week_spec);
+    EXPECT_EQ(system_strftime(iso_week_spec, &tm),
+              fmt::format(fmt::runtime(fmt_spec), tm));
+  }
+
+  // Every day from 1970-01-01
+  std::time_t time_now = std::time(nullptr);
+  for (std::time_t t = 6 * 3600; t < time_now; t += 86400) {
+    tm = *std::localtime(&t);
+
+    auto fmt_spec = fmt::format("{{:{}}}", iso_week_spec);
+    EXPECT_EQ(system_strftime(iso_week_spec, &tm),
+              fmt::format(fmt::runtime(fmt_spec), tm));
+  }
 }
 
+// MSVC:
+//  minkernel\crts\ucrt\src\appcrt\time\wcsftime.cpp(971) : Assertion failed:
+//  timeptr->tm_year >= -1900 && timeptr->tm_year <= 8099
+#ifndef _WIN32
+TEST(chrono_test, format_tm_future) {
+  auto tm = std::tm();
+  tm.tm_year = 10445;  // 10000+ years
+  tm.tm_mon = 3;
+  tm.tm_mday = 25;
+  tm.tm_hour = 11;
+  tm.tm_min = 22;
+  tm.tm_sec = 33;
+  EXPECT_EQ(fmt::format("The date is {:%Y-%m-%d %H:%M:%S}.", tm),
+            "The date is 12345-04-25 11:22:33.");
+  EXPECT_EQ(fmt::format("{:%Y}", tm), "12345");
+  EXPECT_EQ(fmt::format("{:%C}", tm), "123");
+  EXPECT_EQ(fmt::format("{:%C%y}", tm), fmt::format("{:%Y}", tm));
+  EXPECT_EQ(fmt::format("{:%D}", tm), "04/25/45");
+  EXPECT_EQ(fmt::format("{:%F}", tm), "12345-04-25");
+  EXPECT_EQ(fmt::format("{:%T}", tm), "11:22:33");
+}
+
+TEST(chrono_test, format_tm_past) {
+  auto tm = std::tm();
+  tm.tm_year = -2001;
+  tm.tm_mon = 3;
+  tm.tm_mday = 25;
+  tm.tm_hour = 11;
+  tm.tm_min = 22;
+  tm.tm_sec = 33;
+  EXPECT_EQ(fmt::format("The date is {:%Y-%m-%d %H:%M:%S}.", tm),
+            "The date is -101-04-25 11:22:33.");
+  EXPECT_EQ(fmt::format("{:%Y}", tm), "-101");
+
+  // macOS  %C - "-1"
+  // Linux  %C - "-2"
+  // fmt    %C - "-1"
+  EXPECT_EQ(fmt::format("{:%C}", tm), "-1");
+  EXPECT_EQ(fmt::format("{:%C%y}", tm), fmt::format("{:%Y}", tm));
+
+  // macOS  %D - "04/25/01" (%y)
+  // Linux  %D - "04/25/99" (%y)
+  // fmt    %D - "04/25/01" (%y)
+  EXPECT_EQ(fmt::format("{:%D}", tm), "04/25/01");
+
+  EXPECT_EQ(fmt::format("{:%F}", tm), "-101-04-25");
+  EXPECT_EQ(fmt::format("{:%T}", tm), "11:22:33");
+
+  tm.tm_year = -1901;  // -1
+  EXPECT_EQ(fmt::format("{:%Y}", tm), "-001");
+  EXPECT_EQ(fmt::format("{:%C%y}", tm), fmt::format("{:%Y}", tm));
+
+  tm.tm_year = -1911;  // -11
+  EXPECT_EQ(fmt::format("{:%Y}", tm), "-011");
+  EXPECT_EQ(fmt::format("{:%C%y}", tm), fmt::format("{:%Y}", tm));
+}
+#endif
+
 TEST(chrono_test, grow_buffer) {
   auto s = std::string("{:");
   for (int i = 0; i < 30; ++i) s += "%c";
   s += "}\n";
   auto t = std::time(nullptr);
-  fmt::format(fmt::runtime(s), *std::localtime(&t));
+  (void)fmt::format(fmt::runtime(s), *std::localtime(&t));
 }
 
 TEST(chrono_test, format_to_empty_container) {
@@ -88,22 +239,45 @@ TEST(chrono_test, gmtime) {
   EXPECT_TRUE(equal(tm, fmt::gmtime(t)));
 }
 
-template <typename TimePoint> auto strftime(TimePoint tp) -> std::string {
+template <typename TimePoint> auto strftime_full(TimePoint tp) -> std::string {
   auto t = std::chrono::system_clock::to_time_t(tp);
   auto tm = *std::localtime(&t);
-  char output[256] = {};
-  std::strftime(output, sizeof(output), "%Y-%m-%d %H:%M:%S", &tm);
-  return output;
+  return system_strftime("%Y-%m-%d %H:%M:%S", &tm);
 }
 
 TEST(chrono_test, time_point) {
   auto t1 = std::chrono::system_clock::now();
-  EXPECT_EQ(strftime(t1), fmt::format("{:%Y-%m-%d %H:%M:%S}", t1));
-  EXPECT_EQ(strftime(t1), fmt::format("{}", t1));
+  EXPECT_EQ(strftime_full(t1), fmt::format("{:%Y-%m-%d %H:%M:%S}", t1));
+  EXPECT_EQ(strftime_full(t1), fmt::format("{}", t1));
   using time_point =
       std::chrono::time_point<std::chrono::system_clock, std::chrono::seconds>;
   auto t2 = time_point(std::chrono::seconds(42));
-  EXPECT_EQ(strftime(t2), fmt::format("{:%Y-%m-%d %H:%M:%S}", t2));
+  EXPECT_EQ(strftime_full(t2), fmt::format("{:%Y-%m-%d %H:%M:%S}", t2));
+
+  std::vector<std::string> spec_list = {
+      "%%",  "%n",  "%t",  "%Y",  "%EY", "%y",  "%Oy", "%Ey", "%C",
+      "%EC", "%G",  "%g",  "%b",  "%h",  "%B",  "%m",  "%Om", "%U",
+      "%OU", "%W",  "%OW", "%V",  "%OV", "%j",  "%d",  "%Od", "%e",
+      "%Oe", "%a",  "%A",  "%w",  "%Ow", "%u",  "%Ou", "%H",  "%OH",
+      "%I",  "%OI", "%M",  "%OM", "%S",  "%OS", "%x",  "%Ex", "%X",
+      "%EX", "%D",  "%F",  "%R",  "%T",  "%p",  "%z",  "%Z"};
+  spec_list.push_back("%Y-%m-%d %H:%M:%S");
+#ifndef _WIN32
+  // Disabled on Windows because these formats are not consistent among
+  // platforms.
+  spec_list.insert(spec_list.end(), {"%c", "%Ec", "%r"});
+#endif
+
+  for (const auto& spec : spec_list) {
+    auto t = std::chrono::system_clock::to_time_t(t1);
+    auto tm = *std::localtime(&t);
+
+    auto sys_output = system_strftime(spec, &tm);
+
+    auto fmt_spec = fmt::format("{{:{}}}", spec);
+    EXPECT_EQ(sys_output, fmt::format(fmt::runtime(fmt_spec), t1));
+    EXPECT_EQ(sys_output, fmt::format(fmt::runtime(fmt_spec), tm));
+  }
 }
 
 #ifndef FMT_STATIC_THOUSANDS_SEPARATOR
@@ -197,41 +371,41 @@ TEST(chrono_test, format_specs) {
 
 TEST(chrono_test, invalid_specs) {
   auto sec = std::chrono::seconds(0);
-  EXPECT_THROW_MSG(fmt::format(runtime("{:%a}"), sec), fmt::format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{:%a}"), sec), fmt::format_error,
                    "no date");
-  EXPECT_THROW_MSG(fmt::format(runtime("{:%A}"), sec), fmt::format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{:%A}"), sec), fmt::format_error,
                    "no date");
-  EXPECT_THROW_MSG(fmt::format(runtime("{:%c}"), sec), fmt::format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{:%c}"), sec), fmt::format_error,
                    "no date");
-  EXPECT_THROW_MSG(fmt::format(runtime("{:%x}"), sec), fmt::format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{:%x}"), sec), fmt::format_error,
                    "no date");
-  EXPECT_THROW_MSG(fmt::format(runtime("{:%Ex}"), sec), fmt::format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{:%Ex}"), sec), fmt::format_error,
                    "no date");
-  EXPECT_THROW_MSG(fmt::format(runtime("{:%X}"), sec), fmt::format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{:%X}"), sec), fmt::format_error,
                    "no date");
-  EXPECT_THROW_MSG(fmt::format(runtime("{:%EX}"), sec), fmt::format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{:%EX}"), sec), fmt::format_error,
                    "no date");
-  EXPECT_THROW_MSG(fmt::format(runtime("{:%D}"), sec), fmt::format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{:%D}"), sec), fmt::format_error,
                    "no date");
-  EXPECT_THROW_MSG(fmt::format(runtime("{:%F}"), sec), fmt::format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{:%F}"), sec), fmt::format_error,
                    "no date");
-  EXPECT_THROW_MSG(fmt::format(runtime("{:%Ec}"), sec), fmt::format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{:%Ec}"), sec), fmt::format_error,
                    "no date");
-  EXPECT_THROW_MSG(fmt::format(runtime("{:%w}"), sec), fmt::format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{:%w}"), sec), fmt::format_error,
                    "no date");
-  EXPECT_THROW_MSG(fmt::format(runtime("{:%u}"), sec), fmt::format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{:%u}"), sec), fmt::format_error,
                    "no date");
-  EXPECT_THROW_MSG(fmt::format(runtime("{:%b}"), sec), fmt::format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{:%b}"), sec), fmt::format_error,
                    "no date");
-  EXPECT_THROW_MSG(fmt::format(runtime("{:%B}"), sec), fmt::format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{:%B}"), sec), fmt::format_error,
                    "no date");
-  EXPECT_THROW_MSG(fmt::format(runtime("{:%z}"), sec), fmt::format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{:%z}"), sec), fmt::format_error,
                    "no date");
-  EXPECT_THROW_MSG(fmt::format(runtime("{:%Z}"), sec), fmt::format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{:%Z}"), sec), fmt::format_error,
                    "no date");
-  EXPECT_THROW_MSG(fmt::format(runtime("{:%Eq}"), sec), fmt::format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{:%Eq}"), sec), fmt::format_error,
                    "invalid format");
-  EXPECT_THROW_MSG(fmt::format(runtime("{:%Oq}"), sec), fmt::format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{:%Oq}"), sec), fmt::format_error,
                    "invalid format");
 }
 
@@ -279,20 +453,33 @@ TEST(chrono_test, format_default_fp) {
 }
 
 TEST(chrono_test, format_precision) {
-  EXPECT_THROW_MSG(fmt::format(runtime("{:.2}"), std::chrono::seconds(42)),
-                   fmt::format_error,
-                   "precision not allowed for this argument type");
+  EXPECT_THROW_MSG(
+      (void)fmt::format(runtime("{:.2}"), std::chrono::seconds(42)),
+      fmt::format_error, "precision not allowed for this argument type");
+  EXPECT_EQ("1ms", fmt::format("{:.0}", dms(1.234)));
   EXPECT_EQ("1.2ms", fmt::format("{:.1}", dms(1.234)));
   EXPECT_EQ("1.23ms", fmt::format("{:.{}}", dms(1.234), 2));
+
+  EXPECT_EQ("13ms", fmt::format("{:.0}", dms(12.56)));
+  EXPECT_EQ("12.6ms", fmt::format("{:.1}", dms(12.56)));
+  EXPECT_EQ("12.56ms", fmt::format("{:.2}", dms(12.56)));
 }
 
 TEST(chrono_test, format_full_specs) {
+  EXPECT_EQ("1ms   ", fmt::format("{:6.0}", dms(1.234)));
   EXPECT_EQ("1.2ms ", fmt::format("{:6.1}", dms(1.234)));
   EXPECT_EQ("  1.23ms", fmt::format("{:>8.{}}", dms(1.234), 2));
   EXPECT_EQ(" 1.2ms ", fmt::format("{:^{}.{}}", dms(1.234), 7, 1));
   EXPECT_EQ(" 1.23ms ", fmt::format("{0:^{2}.{1}}", dms(1.234), 2, 8));
   EXPECT_EQ("=1.234ms=", fmt::format("{:=^{}.{}}", dms(1.234), 9, 3));
   EXPECT_EQ("*1.2340ms*", fmt::format("{:*^10.4}", dms(1.234)));
+
+  EXPECT_EQ("13ms  ", fmt::format("{:6.0}", dms(12.56)));
+  EXPECT_EQ("    13ms", fmt::format("{:>8.{}}", dms(12.56), 0));
+  EXPECT_EQ(" 13ms ", fmt::format("{:^{}.{}}", dms(12.56), 6, 0));
+  EXPECT_EQ("  13ms  ", fmt::format("{0:^{2}.{1}}", dms(12.56), 0, 8));
+  EXPECT_EQ("==13ms===", fmt::format("{:=^{}.{}}", dms(12.56), 9, 0));
+  EXPECT_EQ("***13ms***", fmt::format("{:*^10.0}", dms(12.56)));
 }
 
 TEST(chrono_test, format_simple_q) {
@@ -306,29 +493,37 @@ TEST(chrono_test, format_simple_q) {
 }
 
 TEST(chrono_test, format_precision_q) {
-  EXPECT_THROW_MSG(fmt::format(runtime("{:.2%Q %q}"), std::chrono::seconds(42)),
-                   fmt::format_error,
-                   "precision not allowed for this argument type");
+  EXPECT_THROW_MSG(
+      (void)fmt::format(runtime("{:.2%Q %q}"), std::chrono::seconds(42)),
+      fmt::format_error, "precision not allowed for this argument type");
   EXPECT_EQ("1.2 ms", fmt::format("{:.1%Q %q}", dms(1.234)));
   EXPECT_EQ("1.23 ms", fmt::format("{:.{}%Q %q}", dms(1.234), 2));
 }
 
 TEST(chrono_test, format_full_specs_q) {
+  EXPECT_EQ("1 ms   ", fmt::format("{:7.0%Q %q}", dms(1.234)));
   EXPECT_EQ("1.2 ms ", fmt::format("{:7.1%Q %q}", dms(1.234)));
   EXPECT_EQ(" 1.23 ms", fmt::format("{:>8.{}%Q %q}", dms(1.234), 2));
   EXPECT_EQ(" 1.2 ms ", fmt::format("{:^{}.{}%Q %q}", dms(1.234), 8, 1));
   EXPECT_EQ(" 1.23 ms ", fmt::format("{0:^{2}.{1}%Q %q}", dms(1.234), 2, 9));
   EXPECT_EQ("=1.234 ms=", fmt::format("{:=^{}.{}%Q %q}", dms(1.234), 10, 3));
   EXPECT_EQ("*1.2340 ms*", fmt::format("{:*^11.4%Q %q}", dms(1.234)));
+
+  EXPECT_EQ("13 ms  ", fmt::format("{:7.0%Q %q}", dms(12.56)));
+  EXPECT_EQ("   13 ms", fmt::format("{:>8.{}%Q %q}", dms(12.56), 0));
+  EXPECT_EQ(" 13 ms  ", fmt::format("{:^{}.{}%Q %q}", dms(12.56), 8, 0));
+  EXPECT_EQ("  13 ms  ", fmt::format("{0:^{2}.{1}%Q %q}", dms(12.56), 0, 9));
+  EXPECT_EQ("==13 ms==", fmt::format("{:=^{}.{}%Q %q}", dms(12.56), 9, 0));
+  EXPECT_EQ("***13 ms***", fmt::format("{:*^11.0%Q %q}", dms(12.56)));
 }
 
 TEST(chrono_test, invalid_width_id) {
-  EXPECT_THROW(fmt::format(runtime("{:{o}"), std::chrono::seconds(0)),
+  EXPECT_THROW((void)fmt::format(runtime("{:{o}"), std::chrono::seconds(0)),
                fmt::format_error);
 }
 
 TEST(chrono_test, invalid_colons) {
-  EXPECT_THROW(fmt::format(runtime("{0}=:{0::"), std::chrono::seconds(0)),
+  EXPECT_THROW((void)fmt::format(runtime("{0}=:{0::"), std::chrono::seconds(0)),
                fmt::format_error);
 }
 
@@ -348,15 +543,12 @@ TEST(chrono_test, negative_durations) {
 }
 
 TEST(chrono_test, special_durations) {
-  EXPECT_EQ(
-      "40.",
-      fmt::format("{:%S}", std::chrono::duration<double>(1e20)).substr(0, 3));
+  auto value = fmt::format("{:%S}", std::chrono::duration<double>(1e20));
+  EXPECT_EQ(value, "40");
   auto nan = std::numeric_limits<double>::quiet_NaN();
   EXPECT_EQ(
       "nan nan nan nan nan:nan nan",
       fmt::format("{:%I %H %M %S %R %r}", std::chrono::duration<double>(nan)));
-  fmt::format("{:%S}",
-              std::chrono::duration<float, std::atto>(1.79400457e+31f));
   EXPECT_EQ(fmt::format("{}", std::chrono::duration<float, std::exa>(1)),
             "1Es");
   EXPECT_EQ(fmt::format("{}", std::chrono::duration<float, std::atto>(1)),
@@ -375,11 +567,59 @@ TEST(chrono_test, weekday) {
   auto loc = get_locale("ru_RU.UTF-8");
   std::locale::global(loc);
   auto mon = fmt::weekday(1);
+
+  auto tm = std::tm();
+  tm.tm_wday = static_cast<int>(mon.c_encoding());
+
   EXPECT_EQ(fmt::format("{}", mon), "Mon");
+  EXPECT_EQ(fmt::format("{:%a}", tm), "Mon");
+
   if (loc != std::locale::classic()) {
     EXPECT_THAT((std::vector<std::string>{"пн", "Пн", "пнд", "Пнд"}),
                 Contains(fmt::format(loc, "{:L}", mon)));
+    EXPECT_THAT((std::vector<std::string>{"пн", "Пн", "пнд", "Пнд"}),
+                Contains(fmt::format(loc, "{:%a}", tm)));
   }
 }
 
+TEST(chrono_test, cpp20_duration_subsecond_support) {
+  using attoseconds = std::chrono::duration<long long, std::atto>;
+  // Check that 18 digits of subsecond precision are supported.
+  EXPECT_EQ(fmt::format("{:%S}", attoseconds{999999999999999999}),
+            "00.999999999999999999");
+  EXPECT_EQ(fmt::format("{:%S}", attoseconds{673231113420148734}),
+            "00.673231113420148734");
+  EXPECT_EQ(fmt::format("{:%S}", attoseconds{-673231113420148734}),
+            "-00.673231113420148734");
+  EXPECT_EQ(fmt::format("{:%S}", std::chrono::nanoseconds{13420148734}),
+            "13.420148734");
+  EXPECT_EQ(fmt::format("{:%S}", std::chrono::nanoseconds{-13420148734}),
+            "-13.420148734");
+  EXPECT_EQ(fmt::format("{:%S}", std::chrono::milliseconds{1234}), "01.234");
+  {
+    // Check that {:%H:%M:%S} is equivalent to {:%T}.
+    auto dur = std::chrono::milliseconds{3601234};
+    auto formatted_dur = fmt::format("{:%T}", dur);
+    EXPECT_EQ(formatted_dur, "01:00:01.234");
+    EXPECT_EQ(fmt::format("{:%H:%M:%S}", dur), formatted_dur);
+  }
+  using nanoseconds_dbl = std::chrono::duration<double, std::nano>;
+  EXPECT_EQ(fmt::format("{:%S}", nanoseconds_dbl{-123456789}), "-00.123456789");
+  EXPECT_EQ(fmt::format("{:%S}", nanoseconds_dbl{9123456789}), "09.123456789");
+  // Verify that only the seconds part is extracted and printed.
+  EXPECT_EQ(fmt::format("{:%S}", nanoseconds_dbl{99123456789}), "39.123456789");
+  EXPECT_EQ(fmt::format("{:%S}", nanoseconds_dbl{99123000000}), "39.123000000");
+  {
+    // Now the hour is printed, and we also test if negative doubles work.
+    auto dur = nanoseconds_dbl{-99123456789};
+    auto formatted_dur = fmt::format("{:%T}", dur);
+    EXPECT_EQ(formatted_dur, "-00:01:39.123456789");
+    EXPECT_EQ(fmt::format("{:%H:%M:%S}", dur), formatted_dur);
+  }
+  // Check that durations with precision greater than std::chrono::seconds have
+  // fixed precision, and print zeros even if there is no fractional part.
+  EXPECT_EQ(fmt::format("{:%S}", std::chrono::microseconds{7000000}),
+            "07.000000");
+}
+
 #endif  // FMT_STATIC_THOUSANDS_SEPARATOR

externals/fmt/test/color-test.cc

@@ -20,10 +20,16 @@ TEST(color_test, format) {
       fmt::format(fg(fmt::color::blue) | bg(fmt::color::red), "two color"),
       "\x1b[38;2;000;000;255m\x1b[48;2;255;000;000mtwo color\x1b[0m");
   EXPECT_EQ(fmt::format(fmt::emphasis::bold, "bold"), "\x1b[1mbold\x1b[0m");
+  EXPECT_EQ(fmt::format(fmt::emphasis::faint, "faint"), "\x1b[2mfaint\x1b[0m");
   EXPECT_EQ(fmt::format(fmt::emphasis::italic, "italic"),
             "\x1b[3mitalic\x1b[0m");
   EXPECT_EQ(fmt::format(fmt::emphasis::underline, "underline"),
             "\x1b[4munderline\x1b[0m");
+  EXPECT_EQ(fmt::format(fmt::emphasis::blink, "blink"), "\x1b[5mblink\x1b[0m");
+  EXPECT_EQ(fmt::format(fmt::emphasis::reverse, "reverse"),
+            "\x1b[7mreverse\x1b[0m");
+  EXPECT_EQ(fmt::format(fmt::emphasis::conceal, "conceal"),
+            "\x1b[8mconceal\x1b[0m");
   EXPECT_EQ(fmt::format(fmt::emphasis::strikethrough, "strikethrough"),
             "\x1b[9mstrikethrough\x1b[0m");
   EXPECT_EQ(

externals/fmt/test/compile-error-test/CMakeLists.txt

@@ -1,71 +1,158 @@
 # Test if compile errors are produced where necessary.
 
 cmake_minimum_required(VERSION 3.1...3.18)
+project(compile-error-test CXX)
 
-include(CheckCXXSourceCompiles)
-include(CheckCXXCompilerFlag)
+set(fmt_headers "
+  #include <fmt/format.h>
+  #include <fmt/xchar.h>
+")
 
-set(CMAKE_REQUIRED_INCLUDES ${CMAKE_CURRENT_SOURCE_DIR}/../../include)
-set(CMAKE_REQUIRED_FLAGS ${CXX_STANDARD_FLAG} ${PEDANTIC_COMPILE_FLAGS})
+set(error_test_names "")
+set(non_error_test_content "")
 
-function (generate_source result fragment)
-  set(${result} "
-  #define FMT_HEADER_ONLY 1
-  #include \"fmt/format.h\"
-  int main() {
-    ${fragment}
-  }
-  " PARENT_SCOPE)
+# For error tests (we expect them to produce compilation error):
+#  * adds a name of test into `error_test_names` list
+#  * generates a single source file (with the same name) for each test
+# For non-error tests (we expect them to compile successfully):
+#  * adds a code segment as separate function to `non_error_test_content`
+function (expect_compile name code_fragment)
+  cmake_parse_arguments(EXPECT_COMPILE "ERROR" "" "" ${ARGN})
+  string(MAKE_C_IDENTIFIER "${name}" test_name)
+
+  if (EXPECT_COMPILE_ERROR)
+    file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/test/${test_name}.cc" "
+      ${fmt_headers}
+      void ${test_name}() {
+        ${code_fragment}
+      }
+    ")
+    set(error_test_names_copy "${error_test_names}")
+    list(APPEND error_test_names_copy "${test_name}")
+    set(error_test_names "${error_test_names_copy}" PARENT_SCOPE)
+  else()
+    set(non_error_test_content "
+      ${non_error_test_content}
+      void ${test_name}() {
+        ${code_fragment}
+      }" PARENT_SCOPE)
+  endif()
 endfunction ()
 
-function (expect_compile code)
-  generate_source(source "${code}")
-  check_cxx_source_compiles("${source}" compiles)
-  if (NOT compiles)
-    set(error_msg "Compile error for: ${code}")
-  endif ()
-  # Unset the CMake cache variable compiles. Otherwise the compile test will
-  # just use cached information next time it runs.
-  unset(compiles CACHE)
-  if (error_msg)
-    message(FATAL_ERROR ${error_msg})
+# Generates a source file for non-error test with `non_error_test_content` and
+# CMake project file with all error and single non-error test targets.
+function (run_tests)
+  set(cmake_targets "")
+  foreach(test_name IN LISTS error_test_names)
+    set(cmake_targets "
+      ${cmake_targets}
+      add_library(test-${test_name} ${test_name}.cc)
+      target_link_libraries(test-${test_name} PRIVATE fmt::fmt)
+    ")
+  endforeach()
+
+  file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/test/non_error_test.cc" "
+    ${fmt_headers}
+    ${non_error_test_content}
+  ")
+  set(cmake_targets "
+    ${cmake_targets}
+    add_library(non-error-test non_error_test.cc)
+    target_link_libraries(non-error-test PRIVATE fmt::fmt)
+  ")
+
+  file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/test/CMakeLists.txt" "
+    cmake_minimum_required(VERSION 3.1...3.18)
+    project(tests CXX)
+    add_subdirectory(${FMT_DIR} fmt)
+    ${cmake_targets}
+  ")
+
+  set(build_directory "${CMAKE_CURRENT_BINARY_DIR}/test/build")
+  file(MAKE_DIRECTORY "${build_directory}")
+  execute_process(
+    COMMAND
+      "${CMAKE_COMMAND}"
+      "-DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}"
+      "-DCMAKE_CXX_FLAGS=${CMAKE_CXX_FLAGS}"
+      "-DCMAKE_CXX_STANDARD=${CMAKE_CXX_STANDARD}"
+      "-DCMAKE_GENERATOR=${CMAKE_GENERATOR}"
+      "-DCMAKE_MAKE_PROGRAM=${CMAKE_MAKE_PROGRAM}"
+      "-DFMT_DIR=${FMT_DIR}"
+      "${CMAKE_CURRENT_BINARY_DIR}/test"
+    WORKING_DIRECTORY "${build_directory}"
+    RESULT_VARIABLE result_var
+    OUTPUT_VARIABLE output_var
+    ERROR_VARIABLE output_var)
+  if (NOT result_var EQUAL 0)
+    message(FATAL_ERROR "Unable to configure:\n${output_var}")
+  endif()
+
+  foreach(test_name IN LISTS error_test_names)
+    execute_process(
+      COMMAND
+        "${CMAKE_COMMAND}" --build "${build_directory}" --target "test-${test_name}"
+      WORKING_DIRECTORY "${build_directory}"
+      RESULT_VARIABLE result_var
+      OUTPUT_VARIABLE output_var
+      ERROR_QUIET)
+    if (result_var EQUAL 0)
+      message(SEND_ERROR "No compile error for \"${test_name}\":\n${output_var}")
+    endif ()
+  endforeach()
+
+  execute_process(
+    COMMAND
+      "${CMAKE_COMMAND}" --build "${build_directory}" --target "non-error-test"
+    WORKING_DIRECTORY "${build_directory}"
+    RESULT_VARIABLE result_var
+    OUTPUT_VARIABLE output_var
+    ERROR_VARIABLE output_var)
+  if (NOT result_var EQUAL 0)
+    message(SEND_ERROR "Compile error for combined non-error test:\n${output_var}")
   endif ()
 endfunction ()
 
-function (expect_compile_error code)
-  generate_source(source "${code}")
-  check_cxx_source_compiles("${source}" compiles)
-  if (compiles)
-    set(error_msg "No compile error for: ${code}")
-  endif ()
-  # Unset the CMake cache variable compiles. Otherwise the compile test will
-  # just use cached information next time it runs.
-  unset(compiles CACHE)
-  if (error_msg)
-    message(FATAL_ERROR ${error_msg})
-  endif ()
-endfunction ()
 
 # check if the source file skeleton compiles
-expect_compile("")
+expect_compile(check "")
+expect_compile(check-error "compilation_error" ERROR)
 
 # Formatting a wide character with a narrow format string is forbidden.
-expect_compile_error("fmt::format(\"{}\", L'a');")
+expect_compile(wide-character-narrow-format-string "fmt::format(L\"{}\", L'a');")
+expect_compile(wide-character-narrow-format-string-error "fmt::format(\"{}\", L'a');" ERROR)
 
 # Formatting a wide string with a narrow format string is forbidden.
-expect_compile_error("fmt::format(\"{}\", L\"foo\");")
+expect_compile(wide-string-narrow-format-string "fmt::format(L\"{}\", L\"foo\");")
+expect_compile(wide-string-narrow-format-string-error "fmt::format(\"{}\", L\"foo\");" ERROR)
 
 # Formatting a narrow string with a wide format string is forbidden because
 # mixing UTF-8 with UTF-16/32 can result in an invalid output.
-expect_compile_error("fmt::format(L\"{}\", \"foo\");")
+expect_compile(narrow-string-wide-format-string "fmt::format(L\"{}\", L\"foo\");")
+expect_compile(narrow-string-wide-format-string-error "fmt::format(L\"{}\", \"foo\");" ERROR)
 
-# Formatting a wide string with a narrow format string is forbidden.
-expect_compile_error("
+expect_compile(cast-to-string "
+  struct S {
+    operator std::string() const { return std::string(); }
+  };
+  fmt::format(\"{}\", std::string(S()));
+")
+expect_compile(cast-to-string-error "
   struct S {
     operator std::string() const { return std::string(); }
   };
   fmt::format(\"{}\", S());
+" ERROR)
+
+# Formatting a function
+expect_compile(format-function "
+  void (*f)();
+  fmt::format(\"{}\", fmt::ptr(f));
 ")
+expect_compile(format-function-error "
+  void (*f)();
+  fmt::format(\"{}\", f);
+" ERROR)
 
 # Make sure that compiler features detected in the header
 # match the features detected in CMake.
@@ -74,6 +161,43 @@ if (SUPPORTS_USER_DEFINED_LITERALS)
 else ()
   set(supports_udl 0)
 endif ()
-expect_compile("#if FMT_USE_USER_DEFINED_LITERALS != ${supports_udl}
-                # error
-                #endif")
+expect_compile(udl-check "
+  #if FMT_USE_USER_DEFINED_LITERALS != ${supports_udl}
+  # error
+  #endif
+")
+
+if (CMAKE_CXX_STANDARD GREATER_EQUAL 20)
+  # Compile-time argument type check
+  expect_compile(format-string-number-spec "
+    #ifdef FMT_HAS_CONSTEVAL
+      fmt::format(\"{:d}\", 42);
+    #endif
+  ")
+  expect_compile(format-string-number-spec-error "
+    #ifdef FMT_HAS_CONSTEVAL
+      fmt::format(\"{:d}\", \"I am not a number\");
+    #else
+      #error
+    #endif
+  " ERROR)
+
+  # Compile-time argument name check
+  expect_compile(format-string-name "
+    #if defined(FMT_HAS_CONSTEVAL) && FMT_USE_NONTYPE_TEMPLATE_PARAMETERS
+      using namespace fmt::literals;
+      fmt::print(\"{foo}\", \"foo\"_a=42);
+    #endif
+  ")
+  expect_compile(format-string-name-error "
+    #if defined(FMT_HAS_CONSTEVAL) && FMT_USE_NONTYPE_TEMPLATE_PARAMETERS
+      using namespace fmt::literals;
+      fmt::print(\"{foo}\", \"bar\"_a=42);
+    #else
+      #error
+    #endif
+  " ERROR)
+endif ()
+
+# Run all tests
+run_tests()

externals/fmt/test/compile-fp-test.cc

@@ -0,0 +1,62 @@
+// Formatting library for C++ - formatting library tests
+//
+// Copyright (c) 2012 - present, Victor Zverovich
+// All rights reserved.
+//
+// For the license information refer to format.h.
+
+#include "fmt/compile.h"
+#include "gmock/gmock.h"
+
+#if defined(__cpp_lib_bit_cast) && __cpp_lib_bit_cast >= 201806 && \
+    defined(__cpp_constexpr) && __cpp_constexpr >= 201907 &&       \
+    defined(__cpp_constexpr_dynamic_alloc) &&                      \
+    __cpp_constexpr_dynamic_alloc >= 201907 && __cplusplus >= 202002L
+template <size_t max_string_length, typename Char = char> struct test_string {
+  template <typename T> constexpr bool operator==(const T& rhs) const noexcept {
+    return fmt::basic_string_view<Char>(rhs).compare(buffer) == 0;
+  }
+  Char buffer[max_string_length]{};
+};
+
+template <size_t max_string_length, typename Char = char, typename... Args>
+consteval auto test_format(auto format, const Args&... args) {
+  test_string<max_string_length, Char> string{};
+  fmt::format_to(string.buffer, format, args...);
+  return string;
+}
+
+TEST(compile_time_formatting_test, floating_point) {
+  EXPECT_EQ("0", test_format<2>(FMT_COMPILE("{}"), 0.0f));
+  EXPECT_EQ("392.500000", test_format<11>(FMT_COMPILE("{0:f}"), 392.5f));
+
+  EXPECT_EQ("0", test_format<2>(FMT_COMPILE("{:}"), 0.0));
+  EXPECT_EQ("0.000000", test_format<9>(FMT_COMPILE("{:f}"), 0.0));
+  EXPECT_EQ("0", test_format<2>(FMT_COMPILE("{:g}"), 0.0));
+  EXPECT_EQ("392.65", test_format<7>(FMT_COMPILE("{:}"), 392.65));
+  EXPECT_EQ("392.65", test_format<7>(FMT_COMPILE("{:g}"), 392.65));
+  EXPECT_EQ("392.65", test_format<7>(FMT_COMPILE("{:G}"), 392.65));
+  EXPECT_EQ("4.9014e+06", test_format<11>(FMT_COMPILE("{:g}"), 4.9014e6));
+  EXPECT_EQ("-392.650000", test_format<12>(FMT_COMPILE("{:f}"), -392.65));
+  EXPECT_EQ("-392.650000", test_format<12>(FMT_COMPILE("{:F}"), -392.65));
+
+  EXPECT_EQ("3.926500e+02", test_format<13>(FMT_COMPILE("{0:e}"), 392.65));
+  EXPECT_EQ("3.926500E+02", test_format<13>(FMT_COMPILE("{0:E}"), 392.65));
+  EXPECT_EQ("+0000392.6", test_format<11>(FMT_COMPILE("{0:+010.4g}"), 392.65));
+  EXPECT_EQ("9223372036854775808.000000",
+            test_format<27>(FMT_COMPILE("{:f}"), 9223372036854775807.0));
+
+  constexpr double nan = std::numeric_limits<double>::quiet_NaN();
+  EXPECT_EQ("nan", test_format<4>(FMT_COMPILE("{}"), nan));
+  EXPECT_EQ("+nan", test_format<5>(FMT_COMPILE("{:+}"), nan));
+  if (std::signbit(-nan))
+    EXPECT_EQ("-nan", test_format<5>(FMT_COMPILE("{}"), -nan));
+  else
+    fmt::print("Warning: compiler doesn't handle negative NaN correctly");
+
+  constexpr double inf = std::numeric_limits<double>::infinity();
+  EXPECT_EQ("inf", test_format<4>(FMT_COMPILE("{}"), inf));
+  EXPECT_EQ("+inf", test_format<5>(FMT_COMPILE("{:+}"), inf));
+  EXPECT_EQ("-inf", test_format<5>(FMT_COMPILE("{}"), -inf));
+}
+#endif

externals/fmt/test/compile-test.cc

@@ -59,7 +59,24 @@ TEST(compile_test, compile_fallback) {
   EXPECT_EQ("42", fmt::format(FMT_COMPILE("{}"), 42));
 }
 
-#ifdef __cpp_if_constexpr
+struct type_with_get {
+  template <int> friend void get(type_with_get);
+};
+
+FMT_BEGIN_NAMESPACE
+template <> struct formatter<type_with_get> : formatter<int> {
+  template <typename FormatContext>
+  auto format(type_with_get, FormatContext& ctx) -> decltype(ctx.out()) {
+    return formatter<int>::format(42, ctx);
+  }
+};
+FMT_END_NAMESPACE
+
+TEST(compile_test, compile_type_with_get) {
+  EXPECT_EQ("42", fmt::format(FMT_COMPILE("{}"), type_with_get()));
+}
+
+#if defined(__cpp_if_constexpr) && defined(__cpp_return_type_deduction)
 struct test_formattable {};
 
 FMT_BEGIN_NAMESPACE

externals/fmt/test/core-test.cc

@@ -151,7 +151,9 @@ TEST(buffer_test, indestructible) {
 template <typename T> struct mock_buffer final : buffer<T> {
   MOCK_METHOD1(do_grow, size_t(size_t capacity));
 
-  void grow(size_t capacity) { this->set(this->data(), do_grow(capacity)); }
+  void grow(size_t capacity) override {
+    this->set(this->data(), do_grow(capacity));
+  }
 
   mock_buffer(T* data = nullptr, size_t buf_capacity = 0) {
     this->set(data, buf_capacity);
@@ -406,15 +408,7 @@ TYPED_TEST(numeric_arg_test, make_and_visit) {
   CHECK_ARG_SIMPLE(std::numeric_limits<TypeParam>::max());
 }
 
-namespace fmt {
-template <> struct is_char<wchar_t> : std::true_type {};
-}  // namespace fmt
-
-TEST(arg_test, char_arg) {
-  CHECK_ARG(char, 'a', 'a');
-  CHECK_ARG(wchar_t, L'a', 'a');
-  CHECK_ARG(wchar_t, L'a', L'a');
-}
+TEST(arg_test, char_arg) { CHECK_ARG(char, 'a', 'a'); }
 
 TEST(arg_test, string_arg) {
   char str_data[] = "test";
@@ -452,7 +446,7 @@ struct check_custom {
     struct test_buffer final : fmt::detail::buffer<char> {
       char data[10];
       test_buffer() : fmt::detail::buffer<char>(data, 0, 10) {}
-      void grow(size_t) {}
+      void grow(size_t) override {}
     } buffer;
     auto parse_ctx = fmt::format_parse_context("");
     auto ctx = fmt::format_context(fmt::detail::buffer_appender<char>(buffer),
@@ -530,7 +524,7 @@ struct test_format_specs_handler {
   fmt::detail::arg_ref<char> width_ref;
   int precision = 0;
   fmt::detail::arg_ref<char> precision_ref;
-  char type = 0;
+  fmt::presentation_type type = fmt::presentation_type::none;
 
   // Workaround for MSVC2017 bug that results in "expression did not evaluate
   // to a constant" with compiler-generated copy ctor.
@@ -556,14 +550,14 @@ struct test_format_specs_handler {
   constexpr void on_dynamic_precision(string_view) {}
 
   constexpr void end_precision() {}
-  constexpr void on_type(char t) { type = t; }
+  constexpr void on_type(fmt::presentation_type t) { type = t; }
   constexpr void on_error(const char*) { res = error; }
 };
 
 template <size_t N>
 constexpr test_format_specs_handler parse_test_specs(const char (&s)[N]) {
   auto h = test_format_specs_handler();
-  fmt::detail::parse_format_specs(s, s + N, h);
+  fmt::detail::parse_format_specs(s, s + N - 1, h);
   return h;
 }
 
@@ -581,7 +575,7 @@ TEST(core_test, constexpr_parse_format_specs) {
   static_assert(parse_test_specs("{42}").width_ref.val.index == 42, "");
   static_assert(parse_test_specs(".42").precision == 42, "");
   static_assert(parse_test_specs(".{42}").precision_ref.val.index == 42, "");
-  static_assert(parse_test_specs("d").type == 'd', "");
+  static_assert(parse_test_specs("d").type == fmt::presentation_type::dec, "");
   static_assert(parse_test_specs("{<").res == handler::error, "");
 }
 
@@ -603,7 +597,7 @@ constexpr fmt::detail::dynamic_format_specs<char> parse_dynamic_specs(
   auto specs = fmt::detail::dynamic_format_specs<char>();
   auto ctx = test_parse_context();
   auto h = fmt::detail::dynamic_specs_handler<test_parse_context>(specs, ctx);
-  parse_format_specs(s, s + N, h);
+  parse_format_specs(s, s + N - 1, h);
   return specs;
 }
 
@@ -621,14 +615,15 @@ TEST(format_test, constexpr_dynamic_specs_handler) {
   static_assert(parse_dynamic_specs(".42").precision == 42, "");
   static_assert(parse_dynamic_specs(".{}").precision_ref.val.index == 11, "");
   static_assert(parse_dynamic_specs(".{42}").precision_ref.val.index == 42, "");
-  static_assert(parse_dynamic_specs("d").type == 'd', "");
+  static_assert(parse_dynamic_specs("d").type == fmt::presentation_type::dec,
+                "");
 }
 
 template <size_t N>
 constexpr test_format_specs_handler check_specs(const char (&s)[N]) {
   fmt::detail::specs_checker<test_format_specs_handler> checker(
       test_format_specs_handler(), fmt::detail::type::double_type);
-  parse_format_specs(s, s + N, checker);
+  parse_format_specs(s, s + N - 1, checker);
   return checker;
 }
 
@@ -645,7 +640,7 @@ TEST(format_test, constexpr_specs_checker) {
   static_assert(check_specs("{42}").width_ref.val.index == 42, "");
   static_assert(check_specs(".42").precision == 42, "");
   static_assert(check_specs(".{42}").precision_ref.val.index == 42, "");
-  static_assert(check_specs("d").type == 'd', "");
+  static_assert(check_specs("d").type == fmt::presentation_type::dec, "");
   static_assert(check_specs("{<").res == handler::error, "");
 }
 
@@ -709,10 +704,80 @@ TEST(core_test, has_formatter) {
                 "");
 }
 
+struct const_formattable {};
+struct nonconst_formattable {};
+
+FMT_BEGIN_NAMESPACE
+template <> struct formatter<const_formattable> {
+  auto parse(format_parse_context& ctx) -> decltype(ctx.begin()) {
+    return ctx.begin();
+  }
+
+  auto format(const const_formattable&, format_context& ctx)
+      -> decltype(ctx.out()) {
+    auto test = string_view("test");
+    return std::copy_n(test.data(), test.size(), ctx.out());
+  }
+};
+
+template <> struct formatter<nonconst_formattable> {
+  auto parse(format_parse_context& ctx) -> decltype(ctx.begin()) {
+    return ctx.begin();
+  }
+
+  auto format(nonconst_formattable&, format_context& ctx)
+      -> decltype(ctx.out()) {
+    auto test = string_view("test");
+    return std::copy_n(test.data(), test.size(), ctx.out());
+  }
+};
+FMT_END_NAMESPACE
+
+struct convertible_to_pointer {
+  operator const int*() const { return nullptr; }
+};
+
+enum class test_scoped_enum {};
+
 TEST(core_test, is_formattable) {
+#if 0
+  // This should be enabled once corresponding map overloads are gone.
+  static_assert(fmt::is_formattable<signed char*>::value, "");
+  static_assert(fmt::is_formattable<unsigned char*>::value, "");
+  static_assert(fmt::is_formattable<const signed char*>::value, "");
+  static_assert(fmt::is_formattable<const unsigned char*>::value, "");
+#endif
+  static_assert(!fmt::is_formattable<wchar_t>::value, "");
+#ifdef __cpp_char8_t
+  static_assert(!fmt::is_formattable<char8_t>::value, "");
+#endif
+  static_assert(!fmt::is_formattable<char16_t>::value, "");
+  static_assert(!fmt::is_formattable<char32_t>::value, "");
+  static_assert(!fmt::is_formattable<const wchar_t*>::value, "");
+  static_assert(!fmt::is_formattable<const wchar_t[3]>::value, "");
+  static_assert(!fmt::is_formattable<fmt::basic_string_view<wchar_t>>::value,
+                "");
   static_assert(fmt::is_formattable<enabled_formatter>::value, "");
   static_assert(!fmt::is_formattable<disabled_formatter>::value, "");
   static_assert(fmt::is_formattable<disabled_formatter_convertible>::value, "");
+
+  static_assert(fmt::is_formattable<const_formattable&>::value, "");
+  static_assert(fmt::is_formattable<const const_formattable&>::value, "");
+
+  static_assert(fmt::is_formattable<nonconst_formattable&>::value, "");
+#if !FMT_MSC_VER || FMT_MSC_VER >= 1910
+  static_assert(!fmt::is_formattable<const nonconst_formattable&>::value, "");
+#endif
+
+  static_assert(!fmt::is_formattable<convertible_to_pointer>::value, "");
+
+  static_assert(!fmt::is_formattable<void (*)()>::value, "");
+
+  struct s;
+
+  static_assert(!fmt::is_formattable<int(s::*)>::value, "");
+  static_assert(!fmt::is_formattable<int (s::*)()>::value, "");
+  static_assert(!fmt::is_formattable<test_scoped_enum>::value, "");
 }
 
 TEST(core_test, format) { EXPECT_EQ(fmt::format("{}", 42), "42"); }
@@ -838,10 +903,21 @@ TEST(core_test, adl) {
   if (fmt::detail::const_check(true)) return;
   auto s = adl_test::string();
   char buf[10];
-  fmt::format("{}", s);
+  (void)fmt::format("{}", s);
   fmt::format_to(buf, "{}", s);
   fmt::format_to_n(buf, 10, "{}", s);
-  fmt::formatted_size("{}", s);
+  (void)fmt::formatted_size("{}", s);
   fmt::print("{}", s);
   fmt::print(stdout, "{}", s);
 }
+
+TEST(core_test, has_const_formatter) {
+  EXPECT_TRUE((fmt::detail::has_const_formatter<const_formattable,
+                                                fmt::format_context>()));
+  EXPECT_FALSE((fmt::detail::has_const_formatter<nonconst_formattable,
+                                                 fmt::format_context>()));
+}
+
+TEST(core_test, format_nonconst) {
+  EXPECT_EQ(fmt::format("{}", nonconst_formattable()), "test");
+}

externals/fmt/test/enforce-checks-test.cc

@@ -17,12 +17,12 @@
 
 // Exercise the API to verify that everything we expect to can compile.
 void test_format_api() {
-  fmt::format(FMT_STRING("{}"), 42);
-  fmt::format(FMT_STRING(L"{}"), 42);
-  fmt::format(FMT_STRING("noop"));
+  (void)fmt::format(FMT_STRING("{}"), 42);
+  (void)fmt::format(FMT_STRING(L"{}"), 42);
+  (void)fmt::format(FMT_STRING("noop"));
 
-  fmt::to_string(42);
-  fmt::to_wstring(42);
+  (void)fmt::to_string(42);
+  (void)fmt::to_wstring(42);
 
   std::vector<char> out;
   fmt::format_to(std::back_inserter(out), FMT_STRING("{}"), 42);
@@ -35,13 +35,14 @@ void test_format_api() {
 }
 
 void test_chrono() {
-  fmt::format(FMT_STRING("{}"), std::chrono::seconds(42));
-  fmt::format(FMT_STRING(L"{}"), std::chrono::seconds(42));
+  (void)fmt::format(FMT_STRING("{}"), std::chrono::seconds(42));
+  (void)fmt::format(FMT_STRING(L"{}"), std::chrono::seconds(42));
 }
 
 void test_text_style() {
   fmt::print(fg(fmt::rgb(255, 20, 30)), FMT_STRING("{}"), "rgb(255,20,30)");
-  fmt::format(fg(fmt::rgb(255, 20, 30)), FMT_STRING("{}"), "rgb(255,20,30)");
+  (void)fmt::format(fg(fmt::rgb(255, 20, 30)), FMT_STRING("{}"),
+                    "rgb(255,20,30)");
 
   fmt::text_style ts = fg(fmt::rgb(255, 20, 30));
   std::string out;
@@ -51,7 +52,7 @@ void test_text_style() {
 
 void test_range() {
   std::vector<char> hello = {'h', 'e', 'l', 'l', 'o'};
-  fmt::format(FMT_STRING("{}"), hello);
+  (void)fmt::format(FMT_STRING("{}"), hello);
 }
 
 int main() {

externals/fmt/test/find-package-test/main.cc

@@ -1,6 +1,5 @@
 #include "fmt/format.h"
 
 int main(int argc, char** argv) {
-  for(int i = 0; i < argc; ++i)
-    fmt::print("{}: {}\n", i, argv[i]);
+  for (int i = 0; i < argc; ++i) fmt::print("{}: {}\n", i, argv[i]);
 }

externals/fmt/test/format

@@ -1,856 +0,0 @@
-// Formatting library for C++ - the standard API implementation
-//
-// Copyright (c) 2012 - present, Victor Zverovich
-// All rights reserved.
-//
-// For the license information refer to format.h.
-
-#ifndef FMT_FORMAT_
-#define FMT_FORMAT_
-
-#include <algorithm>
-#include <cassert>
-#include <variant>
-#include "fmt/format.h"
-
-// This implementation verifies the correctness of the standard API proposed in
-// P0645 Text Formatting and is optimized for copy-pasting from the paper, not
-// for efficiency or readability. An efficient implementation should not use
-// std::variant and should store packed argument type tags separately from
-// values in basic_format_args for small number of arguments.
-
-namespace std {
-template<class T>
-constexpr bool Integral = is_integral_v<T>;
-
-template <class O>
-  using iter_difference_t = ptrdiff_t;
-}
-
-// https://fmt.dev/Text%20Formatting.html#format.syn
-namespace std {
-  // [format.error], class format_error
-  class format_error;
-
-  // [format.formatter], formatter
-  template<class charT> class basic_format_parse_context;
-  using format_parse_context = basic_format_parse_context<char>;
-  using wformat_parse_context = basic_format_parse_context<wchar_t>;
-  
-  template<class Out, class charT> class basic_format_context;
-  using format_context = basic_format_context<
-    /* unspecified */ fmt::detail::buffer_appender<char>, char>;
-  using wformat_context = basic_format_context<
-    /* unspecified */ fmt::detail::buffer_appender<wchar_t>, wchar_t>;
-
-  template<class T, class charT = char> struct formatter {
-    formatter() = delete;
-  };
-  
-  // [format.arguments], arguments
-  template<class Context> class basic_format_arg;
-
-  template<class Visitor, class Context>
-    /* see below */ auto visit_format_arg(Visitor&& vis, basic_format_arg<Context> arg);
-
-  template<class Context, class... Args> struct format_arg_store; // exposition only
-
-  template<class Context> class basic_format_args;
-  using format_args = basic_format_args<format_context>;
-  using wformat_args = basic_format_args<wformat_context>;
-
-  template<class Out, class charT>
-    using format_args_t = basic_format_args<basic_format_context<Out, charT>>;
-
-  template<class Context = format_context, class... Args>
-    format_arg_store<Context, Args...>
-      make_format_args(const Args&... args);
-  template<class... Args>
-    format_arg_store<wformat_context, Args...>
-      make_wformat_args(const Args&... args);
-
-  // [format.functions], formatting functions
-  template<class... Args>
-    string format(string_view fmt, const Args&... args);
-  template<class... Args>
-    wstring format(wstring_view fmt, const Args&... args);
-
-  string vformat(string_view fmt, format_args args);
-  wstring vformat(wstring_view fmt, wformat_args args);
-
-  template<class Out, class... Args>
-    Out format_to(Out out, string_view fmt, const Args&... args);
-  template<class Out, class... Args>
-    Out format_to(Out out, wstring_view fmt, const Args&... args);
-
-  template<class Out>
-    Out vformat_to(Out out, string_view fmt, format_args_t<fmt::type_identity_t<Out>, char> args);
-  template<class Out>
-    Out vformat_to(Out out, wstring_view fmt, format_args_t<fmt::type_identity_t<Out>, wchar_t> args);
-
-  template<class Out>
-    struct format_to_n_result {
-      Out out;
-      iter_difference_t<Out> size;
-    };
-  
-  template<class Out, class... Args>
-    format_to_n_result<Out> format_to_n(Out out, iter_difference_t<Out> n,
-                                        string_view fmt, const Args&... args);
-  template<class Out, class... Args>
-    format_to_n_result<Out> format_to_n(Out out, iter_difference_t<Out> n,
-                                        wstring_view fmt, const Args&... args);
-
-  template<class... Args>
-    size_t formatted_size(string_view fmt, const Args&... args);
-  template<class... Args>
-    size_t formatted_size(wstring_view fmt, const Args&... args);
-}
-
-// https://fmt.dev/Text%20Formatting.html#format.error
-namespace std {
-  class format_error : public runtime_error {
-  public:
-    explicit format_error(const string& what_arg) : runtime_error(what_arg) {}
-    explicit format_error(const char* what_arg) : runtime_error(what_arg) {}
-  };
-}
-
-namespace std {
-namespace detail {
-struct error_handler {
-  // This function is intentionally not constexpr to give a compile-time error.
-  void on_error(const char* message) {
-    throw std::format_error(message);
-  }
-};
-}
-}
-
-// https://fmt.dev/Text%20Formatting.html#format.parse_context
-namespace std {
-  template<class charT>
-  class basic_format_parse_context {
-  public:
-    using char_type = charT;
-    using const_iterator = typename basic_string_view<charT>::const_iterator;
-    using iterator = const_iterator;
-
-  private:
-    iterator begin_;                              // exposition only
-    iterator end_;                                // exposition only
-    enum indexing { unknown, manual, automatic }; // exposition only
-    indexing indexing_;                           // exposition only
-    size_t next_arg_id_;                          // exposition only
-    size_t num_args_;                             // exposition only
-
-  public:
-    explicit constexpr basic_format_parse_context(basic_string_view<charT> fmt,
-                                                  size_t num_args = 0) noexcept;
-    basic_format_parse_context(const basic_format_parse_context&) = delete;
-    basic_format_parse_context& operator=(const basic_format_parse_context&) = delete;
-
-    constexpr const_iterator begin() const noexcept;
-    constexpr const_iterator end() const noexcept;
-    constexpr void advance_to(const_iterator it);
-
-    constexpr size_t next_arg_id();
-    constexpr void check_arg_id(size_t id);
-
-    // Implementation detail:
-    constexpr void check_arg_id(fmt::string_view) {}
-    detail::error_handler error_handler() const { return {}; }
-    void on_error(const char* msg) { error_handler().on_error(msg); }
-  };
-}
-
-namespace std {
-template<class charT>
-/* explicit */ constexpr basic_format_parse_context<charT>::
-                   basic_format_parse_context(basic_string_view<charT> fmt,
-                                              size_t num_args) noexcept
-: begin_(fmt.begin()), end_(fmt.end()), indexing_(unknown), next_arg_id_(0), num_args_(num_args) {}
-
-template<class charT>
-constexpr typename basic_format_parse_context<charT>::const_iterator basic_format_parse_context<charT>::begin() const noexcept { return begin_; }
-
-template<class charT>
-constexpr typename basic_format_parse_context<charT>::const_iterator basic_format_parse_context<charT>::end() const noexcept { return end_; }
-
-template<class charT>
-constexpr void basic_format_parse_context<charT>::advance_to(typename basic_format_parse_context<charT>::iterator it) { begin_ = it; }
-
-template<class charT>
-constexpr size_t basic_format_parse_context<charT>::next_arg_id() {
-  if (indexing_ == manual)
-    throw format_error("manual to automatic indexing");
-  if (indexing_ == unknown)
-    indexing_ = automatic;
-  return next_arg_id_++;
-}
-
-template<class charT>
-constexpr void basic_format_parse_context<charT>::check_arg_id(size_t id) {
-  // clang doesn't support __builtin_is_constant_evaluated yet
-  //if (!(!__builtin_is_constant_evaluated() || id < num_args_))
-  //  throw format_error(invalid index is out of range");
-  if (indexing_ == automatic)
-    throw format_error("automatic to manual indexing");
-  if (indexing_ == unknown)
-    indexing_ = manual;
-}
-}
-
-// https://fmt.dev/Text%20Formatting.html#format.context
-namespace std {
-  template<class Out, class charT>
-  class basic_format_context {
-    basic_format_args<basic_format_context> args_; // exposition only
-    Out out_;                                      // exposition only
-
-  public:
-    using iterator = Out;
-    using char_type = charT;
-    template<class T> using formatter_type = formatter<T, charT>;
-
-    basic_format_arg<basic_format_context> arg(size_t id) const;
-
-    iterator out();
-    void advance_to(iterator it);
-
-    // Implementation details:
-    using format_arg = basic_format_arg<basic_format_context>;
-    basic_format_context(Out out, basic_format_args<basic_format_context> args, fmt::detail::locale_ref)
-    : args_(args), out_(out) {}
-    detail::error_handler error_handler() const { return {}; }
-    basic_format_arg<basic_format_context> arg(fmt::basic_string_view<charT>) const {
-      return {}; // unused: named arguments are not supported yet
-    }
-    void on_error(const char* msg) { error_handler().on_error(msg); }
-  };
-}
-
-namespace std {
-template<class O, class charT>
-basic_format_arg<basic_format_context<O, charT>> basic_format_context<O, charT>::arg(size_t id) const { return args_.get(id); }
-
-template<class O, class charT>
-typename basic_format_context<O, charT>::iterator basic_format_context<O, charT>::out() { return out_; }
-
-template<class O, class charT>
-void basic_format_context<O, charT>::advance_to(typename basic_format_context<O, charT>::iterator it) { out_ = it; }
-}
-
-namespace std {
-namespace detail {
-template <typename T>
-constexpr bool is_standard_integer_v =
-    std::is_same_v<T, signed char> ||
-    std::is_same_v<T, short int> ||
-    std::is_same_v<T, int> ||
-    std::is_same_v<T, long int> ||
-    std::is_same_v<T, long long int>;
-
-template <typename T>
-constexpr bool is_standard_unsigned_integer_v =
-    std::is_same_v<T, unsigned char> ||
-    std::is_same_v<T, unsigned short int> ||
-    std::is_same_v<T, unsigned int> ||
-    std::is_same_v<T, unsigned long int> ||
-    std::is_same_v<T, unsigned long long int>;
-
-template <typename T, typename Char> struct formatter;
-}
-}
-
-// https://fmt.dev/Text%20Formatting.html#format.arg
-namespace std {
-  template<class Context>
-  class basic_format_arg {
-  public:
-    class handle;
-
-  private:
-    using char_type = typename Context::char_type;                       // exposition only
-
-    variant<monostate, bool, char_type,
-            int, unsigned int, long long int, unsigned long long int,
-            double, long double,
-            const char_type*, basic_string_view<char_type>,
-            const void*, handle> value;                                  // exposition only
-
-    template<typename T,
-      typename = enable_if_t<
-        std::is_same_v<T, bool> ||
-        std::is_same_v<T, char_type> ||
-        (std::is_same_v<T, char> && std::is_same_v<char_type, wchar_t>) ||
-        detail::is_standard_integer_v<T> ||
-        detail::is_standard_unsigned_integer_v<T> ||
-        sizeof(typename Context::template formatter_type<T>().format(declval<const T&>(), declval<Context&>())) != 0
-    >> explicit basic_format_arg(const T& v) noexcept; // exposition only
-    explicit basic_format_arg(float n) noexcept;                         // exposition only
-    explicit basic_format_arg(double n) noexcept;                        // exposition only
-    explicit basic_format_arg(long double n) noexcept;                   // exposition only
-    explicit basic_format_arg(const char_type* s);                       // exposition only
-
-    template<class traits>
-      explicit basic_format_arg(
-        basic_string_view<char_type, traits> s) noexcept;                // exposition only
-
-    template<class traits, class Allocator>
-      explicit basic_format_arg(
-        const basic_string<char_type, traits, Allocator>& s) noexcept;   // exposition only
-
-    explicit basic_format_arg(nullptr_t) noexcept;                       // exposition only
-
-    template<class T, typename = enable_if_t<is_void_v<T>>>
-      explicit basic_format_arg(const T* p) noexcept;                    // exposition only
-
-    // Fails due to a bug in clang
-    //template<class Visitor, class Ctx>
-    //  friend auto visit_format_arg(Visitor&& vis,
-    //                                    basic_format_arg<Ctx> arg);           // exposition only
-
-    friend auto get_value(basic_format_arg arg) {
-      return arg.value;
-    }
-
-    template <typename T, typename Char> friend struct detail::formatter;
-
-    template<class Ctx, class... Args>
-      friend format_arg_store<Ctx, Args...>
-        make_format_args(const Args&... args);                           // exposition only
-
-  public:
-    basic_format_arg() noexcept;
-
-    explicit operator bool() const noexcept;
-  };
-}
-
-namespace std {
-template<class Context>
-basic_format_arg<Context>::basic_format_arg() noexcept {}
-
-template<class Context>
-template<class T, typename> /* explicit */ basic_format_arg<Context>::basic_format_arg(const T& v) noexcept {
-  if constexpr (std::is_same_v<T, bool> || std::is_same_v<T, char_type>)
-    value = v;
-  else if constexpr (std::is_same_v<T, char> && std::is_same_v<char_type, wchar_t>)
-    value = static_cast<wchar_t>(v);
-  else if constexpr (detail::is_standard_integer_v<T> && sizeof(T) <= sizeof(int))
-    value = static_cast<int>(v);
-  else if constexpr (detail::is_standard_unsigned_integer_v<T> && sizeof(T) <= sizeof(unsigned))
-    value = static_cast<unsigned>(v);
-  else if constexpr (detail::is_standard_integer_v<T>)
-    value = static_cast<long long int>(v);
-  else if constexpr (detail::is_standard_unsigned_integer_v<T>)
-    value = static_cast<unsigned long long int>(v);
-  else if constexpr (sizeof(typename Context::template formatter_type<T>().format(declval<const T&>(), declval<Context&>())) != 0)
-    value = handle(v);
-}
-
-template<class Context>
-/* explicit */ basic_format_arg<Context>::basic_format_arg(float n) noexcept
-  : value(static_cast<double>(n)) {}
-
-template<class Context>
-/* explicit */ basic_format_arg<Context>::basic_format_arg(double n) noexcept
-  : value(n) {}
-
-template<class Context>
-/* explicit */ basic_format_arg<Context>::basic_format_arg(long double n) noexcept
-  : value(n) {}
-
-template<class Context>
-/* explicit */ basic_format_arg<Context>::basic_format_arg(const typename basic_format_arg<Context>::char_type* s)
-  : value(s) {
-  assert(s != nullptr);
-}
-
-template<class Context>
-template<class traits>
-/* explicit */ basic_format_arg<Context>::basic_format_arg(basic_string_view<char_type, traits> s) noexcept
-  : value(s) {}
-
-template<class Context>
-template<class traits, class Allocator>
-/* explicit */ basic_format_arg<Context>::basic_format_arg(
-    const basic_string<char_type, traits, Allocator>& s) noexcept
-  : value(basic_string_view<char_type>(s.data(), s.size())) {}
-
-
-template<class Context>
-/* explicit */ basic_format_arg<Context>::basic_format_arg(nullptr_t) noexcept
-  : value(static_cast<const void*>(nullptr)) {}
-
-template<class Context>
-template<class T, typename> /* explicit */ basic_format_arg<Context>::basic_format_arg(const T* p) noexcept
-  : value(p) {}
-
-template<class Context>
-/* explicit */ basic_format_arg<Context>::operator bool() const noexcept {
-    return !holds_alternative<monostate>(value);
-}
-}
-
-namespace std {
-  template<class Context>
-  class basic_format_arg<Context>::handle {
-    const void* ptr_;                                         // exposition only
-    void (*format_)(basic_format_parse_context<char_type>&,
-                    Context&, const void*);                   // exposition only
-
-    template<class T> explicit handle(const T& val) noexcept; // exposition only
-
-    friend class basic_format_arg<Context>;                   // exposition only
-
-  public:
-    void format(basic_format_parse_context<char_type>&, Context& ctx) const;
-  };
-}
-
-namespace std {
-template<class Context>
-template<class T> /* explicit */ basic_format_arg<Context>::handle::handle(const T& val) noexcept
-  : ptr_(&val), format_([](basic_format_parse_context<char_type>& parse_ctx, Context& format_ctx, const void* ptr) {
-    typename Context::template formatter_type<T> f;
-    parse_ctx.advance_to(f.parse(parse_ctx));
-    format_ctx.advance_to(f.format(*static_cast<const T*>(ptr), format_ctx));
-  }) {}
-
-template<class Context>
-void basic_format_arg<Context>::handle::format(basic_format_parse_context<char_type>& parse_ctx, Context& format_ctx) const {
-  format_(parse_ctx, format_ctx, ptr_);
-}
-
-// https://fmt.dev/Text%20Formatting.html#format.visit
-template<class Visitor, class Context>
-  auto visit_format_arg(Visitor&& vis, basic_format_arg<Context> arg) {
-    return visit(vis, get_value(arg));
-  }
-}
-
-// https://fmt.dev/Text%20Formatting.html#format.store
-namespace std {
-  template<class Context, class... Args>
-  struct format_arg_store { // exposition only
-    array<basic_format_arg<Context>, sizeof...(Args)> args;
-  };
-}
-
-// https://fmt.dev/Text%20Formatting.html#format.basic_args
-namespace std {
-  template<class Context>
-  class basic_format_args {
-    size_t size_;                           // exposition only
-    const basic_format_arg<Context>* data_; // exposition only
-
-  public:
-    basic_format_args() noexcept;
-
-    template<class... Args>
-      basic_format_args(const format_arg_store<Context, Args...>& store) noexcept;
-
-    basic_format_arg<Context> get(size_t i) const noexcept;
-  };
-}
-
-namespace std {
-
-template<class Context>
-basic_format_args<Context>::basic_format_args() noexcept : size_(0) {}
-
-template<class Context>
-template<class... Args>
-  basic_format_args<Context>::basic_format_args(const format_arg_store<Context, Args...>& store) noexcept
-  : size_(sizeof...(Args)), data_(store.args.data()) {}
-
-template<class Context>
-basic_format_arg<Context> basic_format_args<Context>::get(size_t i) const noexcept {
-  return i < size_ ? data_[i] : basic_format_arg<Context>();
-}
-}
-
-namespace std {
-// https://fmt.dev/Text%20Formatting.html#format.make_args
-template<class Context /*= format_context*/, class... Args>
-  format_arg_store<Context, Args...> make_format_args(const Args&... args) {
-    return {basic_format_arg<Context>(args)...};
-  }
-
-// https://fmt.dev/Text%20Formatting.html#format.make_wargs
-template<class... Args>
-  format_arg_store<wformat_context, Args...> make_wformat_args(const Args&... args) {
-    return make_format_args<wformat_context>(args...);
-  }
-}
-
-namespace std {
-namespace detail {
-
-template <typename OutputIt, typename Char>
-class arg_formatter
-    : public fmt::detail::arg_formatter_base<OutputIt, Char, error_handler> {
- private:
-  using char_type = Char;
-  using base = fmt::detail::arg_formatter_base<OutputIt, Char, error_handler>;
-  using format_context = std::basic_format_context<OutputIt, Char>;
-  using parse_context = basic_format_parse_context<Char>;
-
-  parse_context* parse_ctx_;
-  format_context& ctx_;
-
- public:
-  using iterator = OutputIt;
-  using format_specs = typename base::format_specs;
-
-  /**
-    \rst
-    Constructs an argument formatter object.
-    *ctx* is a reference to the formatting context,
-    *spec* contains format specifier information for standard argument types.
-    \endrst
-   */
-  arg_formatter(format_context& ctx, parse_context* parse_ctx = nullptr, fmt::format_specs* spec = nullptr)
-      : base(ctx.out(), spec, {}), parse_ctx_(parse_ctx), ctx_(ctx) {}
-
-  using base::operator();
-
-  /** Formats an argument of a user-defined type. */
-  iterator operator()(typename std::basic_format_arg<format_context>::handle handle) {
-    handle.format(*parse_ctx_, ctx_);
-    return this->out();
-  }
-
-  iterator operator()(monostate) {
-    throw format_error("");
-  }
-};
-
-template <typename Context>
-inline fmt::detail::type get_type(basic_format_arg<Context> arg) {
-  return visit_format_arg([&] (auto val) {
-    using char_type = typename Context::char_type;
-    using T = decltype(val);
-    if (std::is_same_v<T, monostate>)
-      return fmt::detail::type::none_type;
-    if (std::is_same_v<T, bool>)
-      return fmt::detail::type::bool_type;
-    if (std::is_same_v<T, char_type>)
-      return fmt::detail::type::char_type;
-    if (std::is_same_v<T, int>)
-      return fmt::detail::type::int_type;
-    if (std::is_same_v<T, unsigned int>)
-      return fmt::detail::type::uint_type;
-    if (std::is_same_v<T, long long int>)
-      return fmt::detail::type::long_long_type;
-    if (std::is_same_v<T, unsigned long long int>)
-      return fmt::detail::type::ulong_long_type;
-    if (std::is_same_v<T, double>)
-      return fmt::detail::type::double_type;
-    if (std::is_same_v<T, long double>)
-      return fmt::detail::type::long_double_type;
-    if (std::is_same_v<T, const char_type*>)
-      return fmt::detail::type::cstring_type;
-    if (std::is_same_v<T, basic_string_view<char_type>>)
-      return fmt::detail::type::string_type;
-    if (std::is_same_v<T, const void*>)
-      return fmt::detail::type::pointer_type;
-    assert(get_value(arg).index() == 12);
-    return fmt::detail::type::custom_type;
-  }, arg);
-}
-
-template <typename Context>
-class custom_formatter {
- private:
-  using parse_context = basic_format_parse_context<typename Context::char_type>;
-  parse_context& parse_ctx_;
-  Context& format_ctx_;
-
- public:
-  custom_formatter(parse_context& parse_ctx, Context& ctx) : parse_ctx_(parse_ctx), format_ctx_(ctx) {}
-
-  bool operator()(typename basic_format_arg<Context>::handle h) const {
-    h.format(parse_ctx_, format_ctx_);
-    return true;
-  }
-
-  template <typename T> bool operator()(T) const { return false; }
-};
-
-template <typename ArgFormatter, typename Char, typename Context>
-struct format_handler : detail::error_handler {
-  using iterator = typename ArgFormatter::iterator;
-
-  format_handler(iterator out, basic_string_view<Char> str,
-                 basic_format_args<Context> format_args,
-                 fmt::detail::locale_ref loc)
-      : parse_ctx(str), context(out, format_args, loc) {}
-
-  void on_text(const Char* begin, const Char* end) {
-    auto size = fmt::detail::to_unsigned(end - begin);
-    auto out = context.out();
-    auto&& it = fmt::detail::reserve(out, size);
-    it = std::copy_n(begin, size, it);
-    context.advance_to(out);
-  }
-
-  int on_arg_id() { return parse_ctx.next_arg_id(); }
-  int on_arg_id(unsigned id) { return parse_ctx.check_arg_id(id), id; }
-  int on_arg_id(fmt::basic_string_view<Char>) { return 0; }
-
-  void on_replacement_field(int id, const Char* p) {
-    auto arg = context.arg(id);
-    parse_ctx.advance_to(parse_ctx.begin() + (p  - &*parse_ctx.begin()));
-    custom_formatter<Context> f(parse_ctx, context);
-    if (!visit_format_arg(f, arg))
-      context.advance_to(visit_format_arg(ArgFormatter(context, &parse_ctx), arg));
-  }
-
-  const Char* on_format_specs(int id, const Char* begin, const Char* end) {
-    auto arg = context.arg(id);
-    parse_ctx.advance_to(parse_ctx.begin() + (begin - &*parse_ctx.begin()));
-    custom_formatter<Context> f(parse_ctx, context);
-    if (visit_format_arg(f, arg)) return &*parse_ctx.begin();
-    fmt::basic_format_specs<Char> specs;
-    using fmt::detail::specs_handler;
-    using parse_context = basic_format_parse_context<Char>;
-    fmt::detail::specs_checker<specs_handler<parse_context, Context>> handler(
-        specs_handler<parse_context, Context>(specs, parse_ctx, context), get_type(arg));
-    begin = parse_format_specs(begin, end, handler);
-    if (begin == end || *begin != '}') on_error("missing '}' in format string");
-    parse_ctx.advance_to(parse_ctx.begin() + (begin - &*parse_ctx.begin()));
-    context.advance_to(visit_format_arg(ArgFormatter(context, &parse_ctx, &specs), arg));
-    return begin;
-  }
-
-  basic_format_parse_context<Char> parse_ctx;
-  Context context;
-};
-
-template <typename T, typename Char>
-struct formatter {
-  // Parses format specifiers stopping either at the end of the range or at the
-  // terminating '}'.
-  template <typename ParseContext>
-  FMT_CONSTEXPR typename ParseContext::iterator parse(ParseContext& ctx) {
-    namespace detail = fmt::detail;
-    typedef detail::dynamic_specs_handler<ParseContext> handler_type;
-    auto type = detail::mapped_type_constant<T, fmt::buffer_context<Char>>::value;
-    detail::specs_checker<handler_type> handler(handler_type(specs_, ctx),
-                                                  type);
-    auto it = parse_format_specs(ctx.begin(), ctx.end(), handler);
-    auto type_spec = specs_.type;
-    auto eh = ctx.error_handler();
-    switch (type) {
-    case detail::type::none_type:
-      FMT_ASSERT(false, "invalid argument type");
-      break;
-    case detail::type::int_type:
-    case detail::type::uint_type:
-    case detail::type::long_long_type:
-    case detail::type::ulong_long_type:
-    case detail::type::bool_type:
-      handle_int_type_spec(type_spec,
-                           detail::int_type_checker<decltype(eh)>(eh));
-      break;
-    case detail::type::char_type:
-      handle_char_specs(
-          &specs_, detail::char_specs_checker<decltype(eh)>(type_spec, eh));
-      break;
-    case detail::type::double_type:
-    case detail::type::long_double_type:
-      detail::parse_float_type_spec(specs_, eh);
-      break;
-    case detail::type::cstring_type:
-      detail::handle_cstring_type_spec(
-          type_spec, detail::cstring_type_checker<decltype(eh)>(eh));
-      break;
-    case detail::type::string_type:
-      detail::check_string_type_spec(type_spec, eh);
-      break;
-    case detail::type::pointer_type:
-      detail::check_pointer_type_spec(type_spec, eh);
-      break;
-    case detail::type::custom_type:
-      // Custom format specifiers should be checked in parse functions of
-      // formatter specializations.
-      break;
-    }
-    return it;
-  }
-
-  template <typename FormatContext>
-  auto format(const T& val, FormatContext& ctx) -> decltype(ctx.out()) {
-    fmt::detail::handle_dynamic_spec<fmt::detail::width_checker>(
-        specs_.width, specs_.width_ref, ctx);
-    fmt::detail::handle_dynamic_spec<fmt::detail::precision_checker>(
-        specs_.precision, specs_.precision_ref, ctx);
-    using af = arg_formatter<typename FormatContext::iterator,
-                             typename FormatContext::char_type>;
-    return visit_format_arg(af(ctx, nullptr, &specs_),
-                            basic_format_arg<FormatContext>(val));
-  }
-
- private:
-  fmt::detail::dynamic_format_specs<Char> specs_;
-};
-}  // namespace detail
-
-// https://fmt.dev/Text%20Formatting.html#format.functions
-template<class... Args>
-  string format(string_view fmt, const Args&... args) {
-    return vformat(fmt, make_format_args(args...));
-  }
-
-template<class... Args>
-  wstring format(wstring_view fmt, const Args&... args) {
-    return vformat(fmt, make_wformat_args(args...));
-  }
-
-string vformat(string_view fmt, format_args args) {
-  fmt::memory_buffer mbuf;
-  fmt::detail::buffer<char>& buf = mbuf;
-  using af = detail::arg_formatter<fmt::format_context::iterator, char>;
-  detail::format_handler<af, char, format_context>
-    h(fmt::detail::buffer_appender<char>(buf), fmt, args, {});
-  fmt::detail::parse_format_string<false>(fmt::to_string_view(fmt), h);
-  return to_string(mbuf);
-}
-
-wstring vformat(wstring_view fmt, wformat_args args);
-
-template<class Out, class... Args>
-  Out format_to(Out out, string_view fmt, const Args&... args) {
-    using context = basic_format_context<Out, decltype(fmt)::value_type>;
-    return vformat_to(out, fmt, make_format_args<context>(args...));
-  }
-
-template<class Out, class... Args>
-  Out format_to(Out out, wstring_view fmt, const Args&... args) {
-    using context = basic_format_context<Out, decltype(fmt)::value_type>;
-    return vformat_to(out, fmt, make_format_args<context>(args...));
-  }
-
-template<class Out>
-  Out vformat_to(Out out, string_view fmt, format_args_t<fmt::type_identity_t<Out>, char> args) {
-    using af = detail::arg_formatter<Out, char>;
-    detail::format_handler<af, char, basic_format_context<Out, char>>
-      h(out, fmt, args, {});
-    fmt::detail::parse_format_string<false>(fmt::to_string_view(fmt), h);
-    return h.context.out();
-  }
-
-template<class Out>
-  Out vformat_to(Out out, wstring_view fmt, format_args_t<fmt::type_identity_t<Out>, wchar_t> args);
-
-template<class Out, class... Args>
-  format_to_n_result<Out> format_to_n(Out out, iter_difference_t<Out> n,
-                                      string_view fmt, const Args&... args);
-template<class Out, class... Args>
-  format_to_n_result<Out> format_to_n(Out out, iter_difference_t<Out> n,
-                                      wstring_view fmt, const Args&... args);
-
-template<class... Args>
-  size_t formatted_size(string_view fmt, const Args&... args);
-template<class... Args>
-  size_t formatted_size(wstring_view fmt, const Args&... args);
-
-#define charT char
-
-template<> struct formatter<charT, charT> : detail::formatter<charT, charT> {};
-
-template<> struct formatter<char, wchar_t>;
-
-template<> struct formatter<charT*, charT> : detail::formatter<const charT*, charT> {};
-
-template<> struct formatter<const charT*, charT> : detail::formatter<const charT*, charT> {};
-
-template<size_t N> struct formatter<const charT[N], charT>
-      : detail::formatter<std::basic_string_view<charT>, charT> {};
-
-template<class traits, class Allocator>
-  struct formatter<basic_string<charT, traits, Allocator>, charT>
-      : detail::formatter<std::basic_string_view<charT>, charT> {};
-
-template<class traits>
-  struct formatter<basic_string_view<charT, traits>, charT>
-      : detail::formatter<std::basic_string_view<charT>, charT> {};
-
-template <> struct formatter<nullptr_t, charT> : detail::formatter<const void*, charT> {};
-template <> struct formatter<void*, charT> : detail::formatter<const void*, charT> {};
-template <> struct formatter<const void*, charT> : detail::formatter<const void*, charT> {};
-template <> struct formatter<bool, charT> : detail::formatter<bool, charT> {};
-
-template <> struct formatter<signed char, charT> : detail::formatter<int, charT> {};
-template <> struct formatter<short, charT> : detail::formatter<int, charT> {};
-template <> struct formatter<int, charT> : detail::formatter<int, charT> {};
-template <> struct formatter<long, charT>
-      : detail::formatter<std::conditional_t<sizeof(long) == sizeof(int), int, long long>, charT> {};
-template <> struct formatter<long long, charT> : detail::formatter<long long, charT> {};
-template <> struct formatter<unsigned char, charT> : detail::formatter<unsigned int, charT> {};
-template <> struct formatter<unsigned short, charT> : detail::formatter<unsigned int, charT> {};
-template <> struct formatter<unsigned int, charT> : detail::formatter<unsigned int, charT> {};
-template <> struct formatter<unsigned long, charT>
-      : detail::formatter<std::conditional_t<sizeof(long) == sizeof(int), unsigned, unsigned long long>, charT> {};
-template <> struct formatter<unsigned long long, charT> : detail::formatter<unsigned long long, charT> {};
-
-template <> struct formatter<float, charT> : detail::formatter<double, charT> {};
-template <> struct formatter<double, charT> : detail::formatter<double, charT> {};
-template <> struct formatter<long double, charT> : detail::formatter<long double, charT> {};
-
-#undef charT
-
-#define charT wchar_t
-
-template<> struct formatter<charT, charT> : detail::formatter<charT, charT> {};
-
-template<> struct formatter<char, wchar_t> : detail::formatter<charT, charT> {};
-
-template<> struct formatter<charT*, charT> : detail::formatter<const charT*, charT> {};
-
-template<> struct formatter<const charT*, charT> : detail::formatter<const charT*, charT> {};
-
-template<size_t N> struct formatter<const charT[N], charT>
-      : detail::formatter<std::basic_string_view<charT>, charT> {};
-
-template<class traits, class Allocator>
-  struct formatter<std::basic_string<charT, traits, Allocator>, charT>
-      : detail::formatter<std::basic_string_view<charT>, charT> {};
-
-template<class traits>
-  struct formatter<std::basic_string_view<charT, traits>, charT>
-      : detail::formatter<std::basic_string_view<charT>, charT> {};
-
-template <> struct formatter<nullptr_t, charT> : detail::formatter<const void*, charT> {};
-template <> struct formatter<void*, charT> : detail::formatter<const void*, charT> {};
-template <> struct formatter<const void*, charT> : detail::formatter<const void*, charT> {};
-template <> struct formatter<bool, charT> : detail::formatter<bool, charT> {};
-
-template <> struct formatter<signed char, charT> : detail::formatter<int, charT> {};
-template <> struct formatter<short, charT> : detail::formatter<int, charT> {};
-template <> struct formatter<int, charT> : detail::formatter<int, charT> {};
-template <> struct formatter<long, charT>
-      : detail::formatter<std::conditional_t<sizeof(long) == sizeof(int), int, long long>, charT> {};
-template <> struct formatter<long long, charT> : detail::formatter<long long, charT> {};
-template <> struct formatter<unsigned char, charT> : detail::formatter<unsigned int, charT> {};
-template <> struct formatter<unsigned short, charT> : detail::formatter<unsigned int, charT> {};
-template <> struct formatter<unsigned int, charT> : detail::formatter<unsigned int, charT> {};
-template <> struct formatter<unsigned long, charT>
-      : detail::formatter<std::conditional_t<sizeof(long) == sizeof(int), unsigned, unsigned long long>, charT> {};
-template <> struct formatter<unsigned long long, charT> : detail::formatter<unsigned long long, charT> {};
-
-template <> struct formatter<float, charT> : detail::formatter<double, charT> {};
-template <> struct formatter<double, charT> : detail::formatter<double, charT> {};
-template <> struct formatter<long double, charT> : detail::formatter<long double, charT> {};
-
-#undef charT
-
-  template<> struct formatter<const wchar_t, char> {
-    formatter() = delete;
-  };
-}
-
-#endif  // FMT_FORMAT_

externals/fmt/test/format-impl-test.cc

@@ -278,25 +278,22 @@ TEST(fp_test, get_round_direction) {
 }
 
 TEST(fp_test, fixed_handler) {
-  struct handler : fmt::detail::fixed_handler {
+  struct handler : fmt::detail::gen_digits_handler {
     char buffer[10];
-    handler(int prec = 0) : fmt::detail::fixed_handler() {
+    handler(int prec = 0) : fmt::detail::gen_digits_handler() {
       buf = buffer;
       precision = prec;
     }
   };
-  int exp = 0;
-  handler().on_digit('0', 100, 99, 0, exp, false);
-  EXPECT_THROW(handler().on_digit('0', 100, 100, 0, exp, false),
-               assertion_failure);
+  handler().on_digit('0', 100, 99, 0, false);
+  EXPECT_THROW(handler().on_digit('0', 100, 100, 0, false), assertion_failure);
   namespace digits = fmt::detail::digits;
-  EXPECT_EQ(handler(1).on_digit('0', 100, 10, 10, exp, false), digits::error);
+  EXPECT_EQ(handler(1).on_digit('0', 100, 10, 10, false), digits::error);
   // Check that divisor - error doesn't overflow.
-  EXPECT_EQ(handler(1).on_digit('0', 100, 10, 101, exp, false), digits::error);
+  EXPECT_EQ(handler(1).on_digit('0', 100, 10, 101, false), digits::error);
   // Check that 2 * error doesn't overflow.
   uint64_t max = max_value<uint64_t>();
-  EXPECT_EQ(handler(1).on_digit('0', max, 10, max - 1, exp, false),
-            digits::error);
+  EXPECT_EQ(handler(1).on_digit('0', max, 10, max - 1, false), digits::error);
 }
 
 TEST(fp_test, grisu_format_compiles_with_on_ieee_double) {

externals/fmt/test/format-test.cc

@@ -370,11 +370,11 @@ TEST(format_test, escape) {
 }
 
 TEST(format_test, unmatched_braces) {
-  EXPECT_THROW_MSG(fmt::format(runtime("{")), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{")), format_error,
                    "invalid format string");
-  EXPECT_THROW_MSG(fmt::format(runtime("}")), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("}")), format_error,
                    "unmatched '}' in format string");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0{}")), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0{}")), format_error,
                    "invalid format string");
 }
 
@@ -391,30 +391,30 @@ TEST(format_test, args_in_different_positions) {
 }
 
 TEST(format_test, arg_errors) {
-  EXPECT_THROW_MSG(fmt::format(runtime("{")), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{")), format_error,
                    "invalid format string");
-  EXPECT_THROW_MSG(fmt::format(runtime("{?}")), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{?}")), format_error,
                    "invalid format string");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0")), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0")), format_error,
                    "invalid format string");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0}")), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0}")), format_error,
                    "argument not found");
-  EXPECT_THROW_MSG(fmt::format(runtime("{00}"), 42), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{00}"), 42), format_error,
                    "invalid format string");
 
   char format_str[buffer_size];
   safe_sprintf(format_str, "{%u", INT_MAX);
-  EXPECT_THROW_MSG(fmt::format(runtime(format_str)), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime(format_str)), format_error,
                    "invalid format string");
   safe_sprintf(format_str, "{%u}", INT_MAX);
-  EXPECT_THROW_MSG(fmt::format(runtime(format_str)), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime(format_str)), format_error,
                    "argument not found");
 
   safe_sprintf(format_str, "{%u", INT_MAX + 1u);
-  EXPECT_THROW_MSG(fmt::format(runtime(format_str)), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime(format_str)), format_error,
                    "invalid format string");
   safe_sprintf(format_str, "{%u}", INT_MAX + 1u);
-  EXPECT_THROW_MSG(fmt::format(runtime(format_str)), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime(format_str)), format_error,
                    "argument not found");
 }
 
@@ -458,24 +458,26 @@ TEST(format_test, named_arg) {
                         fmt::arg("i", 0), fmt::arg("j", 0), fmt::arg("k", 0),
                         fmt::arg("l", 0), fmt::arg("m", 0), fmt::arg("n", 0),
                         fmt::arg("o", 0), fmt::arg("p", 0)));
-  EXPECT_THROW_MSG(fmt::format(runtime("{a}")), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{a}")), format_error,
                    "argument not found");
-  EXPECT_THROW_MSG(fmt::format(runtime("{a}"), 42), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{a}"), 42), format_error,
                    "argument not found");
 }
 
 TEST(format_test, auto_arg_index) {
   EXPECT_EQ("abc", fmt::format("{}{}{}", 'a', 'b', 'c'));
-  EXPECT_THROW_MSG(fmt::format(runtime("{0}{}"), 'a', 'b'), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0}{}"), 'a', 'b'), format_error,
                    "cannot switch from manual to automatic argument indexing");
-  EXPECT_THROW_MSG(fmt::format(runtime("{}{0}"), 'a', 'b'), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{}{0}"), 'a', 'b'), format_error,
                    "cannot switch from automatic to manual argument indexing");
   EXPECT_EQ("1.2", fmt::format("{:.{}}", 1.2345, 2));
-  EXPECT_THROW_MSG(fmt::format(runtime("{0}:.{}"), 1.2345, 2), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0}:.{}"), 1.2345, 2),
+                   format_error,
                    "cannot switch from manual to automatic argument indexing");
-  EXPECT_THROW_MSG(fmt::format(runtime("{:.{0}}"), 1.2345, 2), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{:.{0}}"), 1.2345, 2),
+                   format_error,
                    "cannot switch from automatic to manual argument indexing");
-  EXPECT_THROW_MSG(fmt::format(runtime("{}")), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{}")), format_error,
                    "argument not found");
 }
 
@@ -533,9 +535,9 @@ TEST(format_test, center_align) {
 }
 
 TEST(format_test, fill) {
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:{<5}"), 'c'), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:{<5}"), 'c'), format_error,
                    "invalid fill character '{'");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:{<5}}"), 'c'), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:{<5}}"), 'c'), format_error,
                    "invalid fill character '{'");
   EXPECT_EQ("**42", fmt::format("{0:*>4}", 42));
   EXPECT_EQ("**-42", fmt::format("{0:*>5}", -42));
@@ -554,80 +556,83 @@ TEST(format_test, fill) {
   EXPECT_EQ(std::string("\0\0\0*", 4),
             fmt::format(string_view("{:\0>4}", 6), '*'));
   EXPECT_EQ("жж42", fmt::format("{0:ж>4}", 42));
-  EXPECT_THROW_MSG(fmt::format(runtime("{:\x80\x80\x80\x80\x80>}"), 0),
-                   format_error, "missing '}' in format string");
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{:\x80\x80\x80\x80\x80>}"), 0),
+                   format_error, "invalid type specifier");
 }
 
 TEST(format_test, plus_sign) {
   EXPECT_EQ("+42", fmt::format("{0:+}", 42));
   EXPECT_EQ("-42", fmt::format("{0:+}", -42));
   EXPECT_EQ("+42", fmt::format("{0:+}", 42));
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:+}"), 42u), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:+}"), 42u), format_error,
                    "format specifier requires signed argument");
   EXPECT_EQ("+42", fmt::format("{0:+}", 42l));
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:+}"), 42ul), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:+}"), 42ul), format_error,
                    "format specifier requires signed argument");
   EXPECT_EQ("+42", fmt::format("{0:+}", 42ll));
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:+}"), 42ull), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:+}"), 42ull), format_error,
                    "format specifier requires signed argument");
   EXPECT_EQ("+42", fmt::format("{0:+}", 42.0));
   EXPECT_EQ("+42", fmt::format("{0:+}", 42.0l));
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:+"), 'c'), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:+"), 'c'), format_error,
                    "missing '}' in format string");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:+}"), 'c'), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:+}"), 'c'), format_error,
                    "invalid format specifier for char");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:+}"), "abc"), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:+}"), "abc"), format_error,
                    "format specifier requires numeric argument");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:+}"), reinterpret_cast<void*>(0x42)),
-                   format_error, "format specifier requires numeric argument");
+  EXPECT_THROW_MSG(
+      (void)fmt::format(runtime("{0:+}"), reinterpret_cast<void*>(0x42)),
+      format_error, "format specifier requires numeric argument");
 }
 
 TEST(format_test, minus_sign) {
   EXPECT_EQ("42", fmt::format("{0:-}", 42));
   EXPECT_EQ("-42", fmt::format("{0:-}", -42));
   EXPECT_EQ("42", fmt::format("{0:-}", 42));
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:-}"), 42u), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:-}"), 42u), format_error,
                    "format specifier requires signed argument");
   EXPECT_EQ("42", fmt::format("{0:-}", 42l));
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:-}"), 42ul), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:-}"), 42ul), format_error,
                    "format specifier requires signed argument");
   EXPECT_EQ("42", fmt::format("{0:-}", 42ll));
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:-}"), 42ull), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:-}"), 42ull), format_error,
                    "format specifier requires signed argument");
   EXPECT_EQ("42", fmt::format("{0:-}", 42.0));
   EXPECT_EQ("42", fmt::format("{0:-}", 42.0l));
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:-"), 'c'), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:-"), 'c'), format_error,
                    "missing '}' in format string");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:-}"), 'c'), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:-}"), 'c'), format_error,
                    "invalid format specifier for char");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:-}"), "abc"), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:-}"), "abc"), format_error,
                    "format specifier requires numeric argument");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:-}"), reinterpret_cast<void*>(0x42)),
-                   format_error, "format specifier requires numeric argument");
+  EXPECT_THROW_MSG(
+      (void)fmt::format(runtime("{0:-}"), reinterpret_cast<void*>(0x42)),
+      format_error, "format specifier requires numeric argument");
 }
 
 TEST(format_test, space_sign) {
   EXPECT_EQ(" 42", fmt::format("{0: }", 42));
   EXPECT_EQ("-42", fmt::format("{0: }", -42));
   EXPECT_EQ(" 42", fmt::format("{0: }", 42));
-  EXPECT_THROW_MSG(fmt::format(runtime("{0: }"), 42u), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0: }"), 42u), format_error,
                    "format specifier requires signed argument");
   EXPECT_EQ(" 42", fmt::format("{0: }", 42l));
-  EXPECT_THROW_MSG(fmt::format(runtime("{0: }"), 42ul), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0: }"), 42ul), format_error,
                    "format specifier requires signed argument");
   EXPECT_EQ(" 42", fmt::format("{0: }", 42ll));
-  EXPECT_THROW_MSG(fmt::format(runtime("{0: }"), 42ull), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0: }"), 42ull), format_error,
                    "format specifier requires signed argument");
   EXPECT_EQ(" 42", fmt::format("{0: }", 42.0));
   EXPECT_EQ(" 42", fmt::format("{0: }", 42.0l));
-  EXPECT_THROW_MSG(fmt::format(runtime("{0: "), 'c'), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0: "), 'c'), format_error,
                    "missing '}' in format string");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0: }"), 'c'), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0: }"), 'c'), format_error,
                    "invalid format specifier for char");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0: }"), "abc"), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0: }"), "abc"), format_error,
                    "format specifier requires numeric argument");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0: }"), reinterpret_cast<void*>(0x42)),
-                   format_error, "format specifier requires numeric argument");
+  EXPECT_THROW_MSG(
+      (void)fmt::format(runtime("{0: }"), reinterpret_cast<void*>(0x42)),
+      format_error, "format specifier requires numeric argument");
 }
 
 TEST(format_test, hash_flag) {
@@ -670,14 +675,15 @@ TEST(format_test, hash_flag) {
   EXPECT_EQ("0.", fmt::format("{:#.0f}", 0.01));
   EXPECT_EQ("0.50", fmt::format("{:#.2g}", 0.5));
   EXPECT_EQ("0.", fmt::format("{:#.0f}", 0.5));
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:#"), 'c'), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:#"), 'c'), format_error,
                    "missing '}' in format string");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:#}"), 'c'), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:#}"), 'c'), format_error,
                    "invalid format specifier for char");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:#}"), "abc"), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:#}"), "abc"), format_error,
                    "format specifier requires numeric argument");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:#}"), reinterpret_cast<void*>(0x42)),
-                   format_error, "format specifier requires numeric argument");
+  EXPECT_THROW_MSG(
+      (void)fmt::format(runtime("{0:#}"), reinterpret_cast<void*>(0x42)),
+      format_error, "format specifier requires numeric argument");
 }
 
 TEST(format_test, zero_flag) {
@@ -690,14 +696,14 @@ TEST(format_test, zero_flag) {
   EXPECT_EQ("00042", fmt::format("{0:05}", 42ull));
   EXPECT_EQ("-000042", fmt::format("{0:07}", -42.0));
   EXPECT_EQ("-000042", fmt::format("{0:07}", -42.0l));
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:0"), 'c'), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:0"), 'c'), format_error,
                    "missing '}' in format string");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:05}"), 'c'), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:05}"), 'c'), format_error,
                    "invalid format specifier for char");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:05}"), "abc"), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:05}"), "abc"), format_error,
                    "format specifier requires numeric argument");
   EXPECT_THROW_MSG(
-      fmt::format(runtime("{0:05}"), reinterpret_cast<void*>(0x42)),
+      (void)fmt::format(runtime("{0:05}"), reinterpret_cast<void*>(0x42)),
       format_error, "format specifier requires numeric argument");
 }
 
@@ -705,19 +711,19 @@ TEST(format_test, width) {
   char format_str[buffer_size];
   safe_sprintf(format_str, "{0:%u", UINT_MAX);
   increment(format_str + 3);
-  EXPECT_THROW_MSG(fmt::format(runtime(format_str), 0), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime(format_str), 0), format_error,
                    "number is too big");
   size_t size = std::strlen(format_str);
   format_str[size] = '}';
   format_str[size + 1] = 0;
-  EXPECT_THROW_MSG(fmt::format(runtime(format_str), 0), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime(format_str), 0), format_error,
                    "number is too big");
 
   safe_sprintf(format_str, "{0:%u", INT_MAX + 1u);
-  EXPECT_THROW_MSG(fmt::format(runtime(format_str), 0), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime(format_str), 0), format_error,
                    "number is too big");
   safe_sprintf(format_str, "{0:%u}", INT_MAX + 1u);
-  EXPECT_THROW_MSG(fmt::format(runtime(format_str), 0), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime(format_str), 0), format_error,
                    "number is too big");
   EXPECT_EQ(" -42", fmt::format("{0:4}", -42));
   EXPECT_EQ("   42", fmt::format("{0:5}", 42u));
@@ -742,47 +748,47 @@ TEST(format_test, runtime_width) {
   char format_str[buffer_size];
   safe_sprintf(format_str, "{0:{%u", UINT_MAX);
   increment(format_str + 4);
-  EXPECT_THROW_MSG(fmt::format(runtime(format_str), 0), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime(format_str), 0), format_error,
                    "invalid format string");
   size_t size = std::strlen(format_str);
   format_str[size] = '}';
   format_str[size + 1] = 0;
-  EXPECT_THROW_MSG(fmt::format(runtime(format_str), 0), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime(format_str), 0), format_error,
                    "argument not found");
   format_str[size + 1] = '}';
   format_str[size + 2] = 0;
-  EXPECT_THROW_MSG(fmt::format(runtime(format_str), 0), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime(format_str), 0), format_error,
                    "argument not found");
 
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:{"), 0), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:{"), 0), format_error,
                    "invalid format string");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:{}"), 0), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:{}"), 0), format_error,
                    "cannot switch from manual to automatic argument indexing");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:{?}}"), 0), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:{?}}"), 0), format_error,
                    "invalid format string");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:{1}}"), 0), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:{1}}"), 0), format_error,
                    "argument not found");
 
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:{0:}}"), 0), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:{0:}}"), 0), format_error,
                    "invalid format string");
 
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:{1}}"), 0, -1), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:{1}}"), 0, -1), format_error,
                    "negative width");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:{1}}"), 0, (INT_MAX + 1u)),
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:{1}}"), 0, (INT_MAX + 1u)),
                    format_error, "number is too big");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:{1}}"), 0, -1l), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:{1}}"), 0, -1l), format_error,
                    "negative width");
   if (fmt::detail::const_check(sizeof(long) > sizeof(int))) {
     long value = INT_MAX;
-    EXPECT_THROW_MSG(fmt::format(runtime("{0:{1}}"), 0, (value + 1)),
+    EXPECT_THROW_MSG((void)fmt::format(runtime("{0:{1}}"), 0, (value + 1)),
                      format_error, "number is too big");
   }
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:{1}}"), 0, (INT_MAX + 1ul)),
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:{1}}"), 0, (INT_MAX + 1ul)),
                    format_error, "number is too big");
 
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:{1}}"), 0, '0'), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:{1}}"), 0, '0'), format_error,
                    "width is not integer");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:{1}}"), 0, 0.0), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:{1}}"), 0, 0.0), format_error,
                    "width is not integer");
 
   EXPECT_EQ(" -42", fmt::format("{0:{1}}", -42, 4));
@@ -803,53 +809,53 @@ TEST(format_test, precision) {
   char format_str[buffer_size];
   safe_sprintf(format_str, "{0:.%u", UINT_MAX);
   increment(format_str + 4);
-  EXPECT_THROW_MSG(fmt::format(runtime(format_str), 0), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime(format_str), 0), format_error,
                    "number is too big");
   size_t size = std::strlen(format_str);
   format_str[size] = '}';
   format_str[size + 1] = 0;
-  EXPECT_THROW_MSG(fmt::format(runtime(format_str), 0), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime(format_str), 0), format_error,
                    "number is too big");
 
   safe_sprintf(format_str, "{0:.%u", INT_MAX + 1u);
-  EXPECT_THROW_MSG(fmt::format(runtime(format_str), 0), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime(format_str), 0), format_error,
                    "number is too big");
   safe_sprintf(format_str, "{0:.%u}", INT_MAX + 1u);
-  EXPECT_THROW_MSG(fmt::format(runtime(format_str), 0), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime(format_str), 0), format_error,
                    "number is too big");
 
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:."), 0), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:."), 0), format_error,
                    "missing precision specifier");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:.}"), 0), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.}"), 0), format_error,
                    "missing precision specifier");
 
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:.2"), 0), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.2"), 0), format_error,
                    "precision not allowed for this argument type");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:.2}"), 42), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.2}"), 42), format_error,
                    "precision not allowed for this argument type");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:.2f}"), 42), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.2f}"), 42), format_error,
                    "precision not allowed for this argument type");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:.2}"), 42u), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.2}"), 42u), format_error,
                    "precision not allowed for this argument type");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:.2f}"), 42u), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.2f}"), 42u), format_error,
                    "precision not allowed for this argument type");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:.2}"), 42l), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.2}"), 42l), format_error,
                    "precision not allowed for this argument type");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:.2f}"), 42l), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.2f}"), 42l), format_error,
                    "precision not allowed for this argument type");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:.2}"), 42ul), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.2}"), 42ul), format_error,
                    "precision not allowed for this argument type");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:.2f}"), 42ul), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.2f}"), 42ul), format_error,
                    "precision not allowed for this argument type");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:.2}"), 42ll), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.2}"), 42ll), format_error,
                    "precision not allowed for this argument type");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:.2f}"), 42ll), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.2f}"), 42ll), format_error,
                    "precision not allowed for this argument type");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:.2}"), 42ull), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.2}"), 42ull), format_error,
                    "precision not allowed for this argument type");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:.2f}"), 42ull), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.2f}"), 42ull), format_error,
                    "precision not allowed for this argument type");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:3.0}"), 'x'), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:3.0}"), 'x'), format_error,
                    "precision not allowed for this argument type");
   EXPECT_EQ("1.2", fmt::format("{0:.2}", 1.2345));
   EXPECT_EQ("1.2", fmt::format("{0:.2}", 1.2345l));
@@ -866,6 +872,23 @@ TEST(format_test, precision) {
       "117102665855668676818703956031062493194527159149245532930545654440112748"
       "012970999954193198940908041656332452475714786901472678015935523861155013"
       "480352649347201937902681071074917033322268447533357208324319361e-324");
+  EXPECT_EQ(
+      fmt::format("{:.1074f}", 1.1125369292536e-308),
+      "0.0000000000000000000000000000000000000000000000000000000000000000000000"
+      "000000000000000000000000000000000000000000000000000000000000000000000000"
+      "000000000000000000000000000000000000000000000000000000000000000000000000"
+      "000000000000000000000000000000000000000000000000000000000000000000000000"
+      "000000000000000000000111253692925360019747947051741965785554081512200979"
+      "355021686109411883779182127659725163430929750364498219730822952552570601"
+      "152163505899912777129583674906301179059298598412303893909188340988729019"
+      "014361467448914817838555156840459458527907308695109202499990850735085304"
+      "478476991912072201449236975063640913461919914396877093174125167509869762"
+      "482369631100360266123742648159508919592746619553246586039571522788247697"
+      "156360766271842991667238355464496455107749716934387136380536472531224398"
+      "559833794807213172371254492216255558078524900147957309382830827524104234"
+      "530961756787819847850302379672357738807808384667004752163416921762619527"
+      "462847642037420991432005657440259928195996762610375541867198059294212446"
+      "81962777939941034720757232455434770912461317493580281734466552734375");
 
   std::string outputs[] = {
       "-0X1.41FE3FFE71C9E000000000000000000000000000000000000000000000000000000"
@@ -903,13 +926,16 @@ TEST(format_test, precision) {
   EXPECT_EQ("1.0e-34", fmt::format("{:.1e}", 1e-34));
 
   EXPECT_THROW_MSG(
-      fmt::format(runtime("{0:.2}"), reinterpret_cast<void*>(0xcafe)),
+      (void)fmt::format(runtime("{0:.2}"), reinterpret_cast<void*>(0xcafe)),
       format_error, "precision not allowed for this argument type");
   EXPECT_THROW_MSG(
-      fmt::format(runtime("{0:.2f}"), reinterpret_cast<void*>(0xcafe)),
+      (void)fmt::format(runtime("{0:.2f}"), reinterpret_cast<void*>(0xcafe)),
       format_error, "precision not allowed for this argument type");
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{:.{}e}"), 42.0,
+                                     fmt::detail::max_value<int>()),
+                   format_error, "number is too big");
   EXPECT_THROW_MSG(
-      fmt::format(runtime("{:.{}e}"), 42.0, fmt::detail::max_value<int>()),
+      (void)fmt::format("{:.2147483646f}", -2.2121295195081227E+304),
       format_error, "number is too big");
 
   EXPECT_EQ("st", fmt::format("{0:.2}", "str"));
@@ -919,86 +945,97 @@ TEST(format_test, runtime_precision) {
   char format_str[buffer_size];
   safe_sprintf(format_str, "{0:.{%u", UINT_MAX);
   increment(format_str + 5);
-  EXPECT_THROW_MSG(fmt::format(runtime(format_str), 0), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime(format_str), 0), format_error,
                    "invalid format string");
   size_t size = std::strlen(format_str);
   format_str[size] = '}';
   format_str[size + 1] = 0;
-  EXPECT_THROW_MSG(fmt::format(runtime(format_str), 0), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime(format_str), 0), format_error,
                    "argument not found");
   format_str[size + 1] = '}';
   format_str[size + 2] = 0;
-  EXPECT_THROW_MSG(fmt::format(runtime(format_str), 0), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime(format_str), 0), format_error,
                    "argument not found");
 
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:.{"), 0), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.{"), 0), format_error,
                    "invalid format string");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:.{}"), 0), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.{}"), 0), format_error,
                    "cannot switch from manual to automatic argument indexing");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:.{?}}"), 0), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.{?}}"), 0), format_error,
                    "invalid format string");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:.{1}"), 0, 0), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.{1}"), 0, 0), format_error,
                    "precision not allowed for this argument type");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:.{1}}"), 0), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.{1}}"), 0), format_error,
                    "argument not found");
 
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:.{0:}}"), 0), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.{0:}}"), 0), format_error,
                    "invalid format string");
 
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:.{1}}"), 0, -1), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.{1}}"), 0, -1), format_error,
                    "negative precision");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:.{1}}"), 0, (INT_MAX + 1u)),
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.{1}}"), 0, (INT_MAX + 1u)),
                    format_error, "number is too big");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:.{1}}"), 0, -1l), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.{1}}"), 0, -1l), format_error,
                    "negative precision");
   if (fmt::detail::const_check(sizeof(long) > sizeof(int))) {
     long value = INT_MAX;
-    EXPECT_THROW_MSG(fmt::format(runtime("{0:.{1}}"), 0, (value + 1)),
+    EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.{1}}"), 0, (value + 1)),
                      format_error, "number is too big");
   }
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:.{1}}"), 0, (INT_MAX + 1ul)),
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.{1}}"), 0, (INT_MAX + 1ul)),
                    format_error, "number is too big");
 
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:.{1}}"), 0, '0'), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.{1}}"), 0, '0'), format_error,
                    "precision is not integer");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:.{1}}"), 0, 0.0), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.{1}}"), 0, 0.0), format_error,
                    "precision is not integer");
 
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:.{1}}"), 42, 2), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.{1}}"), 42, 2), format_error,
                    "precision not allowed for this argument type");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:.{1}f}"), 42, 2), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.{1}f}"), 42, 2), format_error,
                    "precision not allowed for this argument type");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:.{1}}"), 42u, 2), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.{1}}"), 42u, 2), format_error,
                    "precision not allowed for this argument type");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:.{1}f}"), 42u, 2), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.{1}f}"), 42u, 2),
+                   format_error,
                    "precision not allowed for this argument type");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:.{1}}"), 42l, 2), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.{1}}"), 42l, 2), format_error,
                    "precision not allowed for this argument type");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:.{1}f}"), 42l, 2), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.{1}f}"), 42l, 2),
+                   format_error,
                    "precision not allowed for this argument type");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:.{1}}"), 42ul, 2), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.{1}}"), 42ul, 2),
+                   format_error,
                    "precision not allowed for this argument type");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:.{1}f}"), 42ul, 2), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.{1}f}"), 42ul, 2),
+                   format_error,
                    "precision not allowed for this argument type");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:.{1}}"), 42ll, 2), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.{1}}"), 42ll, 2),
+                   format_error,
                    "precision not allowed for this argument type");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:.{1}f}"), 42ll, 2), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.{1}f}"), 42ll, 2),
+                   format_error,
                    "precision not allowed for this argument type");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:.{1}}"), 42ull, 2), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.{1}}"), 42ull, 2),
+                   format_error,
                    "precision not allowed for this argument type");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:.{1}f}"), 42ull, 2), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.{1}f}"), 42ull, 2),
+                   format_error,
                    "precision not allowed for this argument type");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:3.{1}}"), 'x', 0), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:3.{1}}"), 'x', 0),
+                   format_error,
                    "precision not allowed for this argument type");
   EXPECT_EQ("1.2", fmt::format("{0:.{1}}", 1.2345, 2));
   EXPECT_EQ("1.2", fmt::format("{1:.{0}}", 2, 1.2345l));
 
-  EXPECT_THROW_MSG(
-      fmt::format(runtime("{0:.{1}}"), reinterpret_cast<void*>(0xcafe), 2),
-      format_error, "precision not allowed for this argument type");
-  EXPECT_THROW_MSG(
-      fmt::format(runtime("{0:.{1}f}"), reinterpret_cast<void*>(0xcafe), 2),
-      format_error, "precision not allowed for this argument type");
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.{1}}"),
+                                     reinterpret_cast<void*>(0xcafe), 2),
+                   format_error,
+                   "precision not allowed for this argument type");
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.{1}f}"),
+                                     reinterpret_cast<void*>(0xcafe), 2),
+                   format_error,
+                   "precision not allowed for this argument type");
 
   EXPECT_EQ("st", fmt::format("{0:.{1}}", "str", 2));
 }
@@ -1029,15 +1066,15 @@ void check_unknown_types(const T& value, const char* types, const char*) {
     if (std::strchr(types, c) || std::strchr(special, c) || !c) continue;
     safe_sprintf(format_str, "{0:10%c}", c);
     const char* message = "invalid type specifier";
-    EXPECT_THROW_MSG(fmt::format(runtime(format_str), value), format_error,
-                     message)
+    EXPECT_THROW_MSG((void)fmt::format(runtime(format_str), value),
+                     format_error, message)
         << format_str << " " << message;
   }
 }
 
 TEST(format_test, format_int) {
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:v"), 42), format_error,
-                   "missing '}' in format string");
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:v"), 42), format_error,
+                   "invalid type specifier");
   check_unknown_types(42, "bBdoxXnLc", "integer");
   EXPECT_EQ("x", fmt::format("{:c}", static_cast<int>('x')));
 }
@@ -1345,26 +1382,10 @@ TEST(format_test, format_cstring) {
   char nonconst[] = "nonconst";
   EXPECT_EQ("nonconst", fmt::format("{0}", nonconst));
   EXPECT_THROW_MSG(
-      fmt::format(runtime("{0}"), static_cast<const char*>(nullptr)),
+      (void)fmt::format(runtime("{0}"), static_cast<const char*>(nullptr)),
       format_error, "string pointer is null");
 }
 
-TEST(format_test, format_schar_string) {
-  signed char str[] = "test";
-  EXPECT_EQ("test", fmt::format("{0:s}", str));
-  const signed char* const_str = str;
-  EXPECT_EQ("test", fmt::format("{0:s}", const_str));
-}
-
-TEST(format_test, format_uchar_string) {
-  unsigned char str[] = "test";
-  EXPECT_EQ("test", fmt::format("{0:s}", str));
-  const unsigned char* const_str = str;
-  EXPECT_EQ("test", fmt::format("{0:s}", const_str));
-  unsigned char* ptr = str;
-  EXPECT_EQ("test", fmt::format("{0:s}", ptr));
-}
-
 void function_pointer_test(int, double, std::string) {}
 
 TEST(format_test, format_pointer) {
@@ -1390,6 +1411,8 @@ TEST(format_test, format_pointer) {
 
 TEST(format_test, format_string) {
   EXPECT_EQ("test", fmt::format("{0}", std::string("test")));
+  EXPECT_THROW((void)fmt::format(fmt::runtime("{:x}"), std::string("test")),
+               fmt::format_error);
 }
 
 TEST(format_test, format_string_view) {
@@ -1479,7 +1502,7 @@ template <> struct formatter<Answer> : formatter<int> {
 FMT_END_NAMESPACE
 
 TEST(format_test, format_custom) {
-  EXPECT_THROW_MSG(fmt::format(runtime("{:s}"), date(2012, 12, 9)),
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{:s}"), date(2012, 12, 9)),
                    format_error, "unknown format specifier");
   EXPECT_EQ("42", fmt::format("{0}", Answer()));
   EXPECT_EQ("0042", fmt::format("{:04}", Answer()));
@@ -1556,8 +1579,9 @@ TEST(format_test, format_examples) {
             fmt::format("int: {0:d};  hex: {0:#x};  oct: {0:#o}", 42));
 
   EXPECT_EQ("The answer is 42", fmt::format("The answer is {}", 42));
-  EXPECT_THROW_MSG(fmt::format(runtime("The answer is {:d}"), "forty-two"),
-                   format_error, "invalid type specifier");
+  EXPECT_THROW_MSG(
+      (void)fmt::format(runtime("The answer is {:d}"), "forty-two"),
+      format_error, "invalid type specifier");
 
   EXPECT_WRITE(
       stdout, fmt::print("{}", std::numeric_limits<double>::infinity()), "inf");
@@ -1593,6 +1617,11 @@ TEST(format_test, bytes) {
   EXPECT_EQ(10, s.size());
 }
 
+TEST(format_test, group_digits_view) {
+  EXPECT_EQ(fmt::format("{}", fmt::group_digits(10000000)), "10,000,000");
+  EXPECT_EQ(fmt::format("{:8}", fmt::group_digits(1000)), "   1,000");
+}
+
 enum test_enum { foo, bar };
 
 TEST(format_test, join) {
@@ -1716,6 +1745,21 @@ TEST(format_test, custom_format_compile_time_string) {
 
 using namespace fmt::literals;
 
+#  if FMT_GCC_VERSION
+#    define FMT_CHECK_DEPRECATED_UDL_FORMAT 1
+#  elif FMT_CLANG_VERSION && defined(__has_warning)
+#    if __has_warning("-Wdeprecated-declarations")
+#      define FMT_CHECK_DEPRECATED_UDL_FORMAT 1
+#    endif
+#  endif
+#  ifndef FMT_CHECK_DEPRECATED_UDL_FORMAT
+#    define FMT_CHECK_DEPRECATED_UDL_FORMAT 0
+#  endif
+
+#  if FMT_CHECK_DEPRECATED_UDL_FORMAT
+#    pragma GCC diagnostic push
+#    pragma GCC diagnostic ignored "-Wdeprecated-declarations"
+
 TEST(format_test, format_udl) {
   EXPECT_EQ("{}c{}"_format("ab", 1), fmt::format("{}c{}", "ab", 1));
   EXPECT_EQ("foo"_format(), "foo");
@@ -1723,6 +1767,9 @@ TEST(format_test, format_udl) {
   EXPECT_EQ("{}"_format(date(2015, 10, 21)), "2015-10-21");
 }
 
+#    pragma GCC diagnostic pop
+#  endif
+
 TEST(format_test, named_arg_udl) {
   auto udl_a = fmt::format("{first}{second}{first}{third}", "first"_a = "abra",
                            "second"_a = "cad", "third"_a = 99);
@@ -1775,21 +1822,21 @@ TEST(format_test, dynamic_formatter) {
   EXPECT_EQ("42", fmt::format("{:d}", num));
   EXPECT_EQ("foo", fmt::format("{:s}", str));
   EXPECT_EQ(" 42 foo ", fmt::format("{:{}} {:{}}", num, 3, str, 4));
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:{}}"), num), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:{}}"), num), format_error,
                    "cannot switch from manual to automatic argument indexing");
-  EXPECT_THROW_MSG(fmt::format(runtime("{:{0}}"), num), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{:{0}}"), num), format_error,
                    "cannot switch from automatic to manual argument indexing");
-  EXPECT_THROW_MSG(fmt::format(runtime("{:+}"), str), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{:+}"), str), format_error,
                    "format specifier requires numeric argument");
-  EXPECT_THROW_MSG(fmt::format(runtime("{:-}"), str), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{:-}"), str), format_error,
                    "format specifier requires numeric argument");
-  EXPECT_THROW_MSG(fmt::format(runtime("{: }"), str), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{: }"), str), format_error,
                    "format specifier requires numeric argument");
-  EXPECT_THROW_MSG(fmt::format(runtime("{:#}"), str), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{:#}"), str), format_error,
                    "format specifier requires numeric argument");
-  EXPECT_THROW_MSG(fmt::format(runtime("{:0}"), str), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{:0}"), str), format_error,
                    "format specifier requires numeric argument");
-  EXPECT_THROW_MSG(fmt::format(runtime("{:.2}"), num), format_error,
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{:.2}"), num), format_error,
                    "precision not allowed for this argument type");
 }
 
@@ -1813,13 +1860,20 @@ struct formatter<adl_test::fmt::detail::foo> : formatter<std::string> {
 };
 FMT_END_NAMESPACE
 
-TEST(format_test, to_string) {
-  EXPECT_EQ("42", fmt::to_string(42));
-  EXPECT_EQ("0x1234", fmt::to_string(reinterpret_cast<void*>(0x1234)));
-  EXPECT_EQ("foo", fmt::to_string(adl_test::fmt::detail::foo()));
+struct convertible_to_int {
+  operator int() const { return value; }
 
-  enum test_enum2 : unsigned char { test_value };
-  EXPECT_EQ("0", fmt::to_string(test_value));
+  int value = 42;
+};
+
+TEST(format_test, to_string) {
+  EXPECT_EQ(fmt::to_string(42), "42");
+  EXPECT_EQ(fmt::to_string(reinterpret_cast<void*>(0x1234)), "0x1234");
+  EXPECT_EQ(fmt::to_string(adl_test::fmt::detail::foo()), "foo");
+  EXPECT_EQ(fmt::to_string(convertible_to_int()), "42");
+
+  enum foo : unsigned char { zero };
+  EXPECT_EQ(fmt::to_string(zero), "0");
 }
 
 TEST(format_test, output_iterators) {

externals/fmt/test/fuzzing/CMakeLists.txt

@@ -25,6 +25,6 @@ function(add_fuzzer source)
   target_compile_features(${name} PRIVATE cxx_generic_lambdas)
 endfunction()
 
-foreach (source chrono-duration.cc float.cc named-arg.cc one-arg.cc two-args.cc)
+foreach (source chrono-duration.cc chrono-timepoint.cc float.cc named-arg.cc one-arg.cc two-args.cc)
   add_fuzzer(${source})
 endforeach ()

externals/fmt/test/fuzzing/build.sh

@@ -22,6 +22,8 @@ here=$(pwd)
 CXXFLAGSALL="-DFUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION= -g"
 CMAKEFLAGSALL="$root -GNinja -DCMAKE_BUILD_TYPE=Debug -DFMT_DOC=Off -DFMT_TEST=Off -DFMT_FUZZ=On -DCMAKE_CXX_STANDARD=17"
 
+CLANG=clang++-11
+
 # For performance analysis of the fuzzers.
 builddir=$here/build-fuzzers-perfanalysis
 mkdir -p $builddir
@@ -37,7 +39,7 @@ cmake --build $builddir
 builddir=$here/build-fuzzers-ossfuzz
 mkdir -p $builddir
 cd $builddir
-CXX="clang++" \
+CXX=$CLANG \
 CXXFLAGS="$CXXFLAGSALL -fsanitize=fuzzer-no-link" cmake \
 cmake $CMAKEFLAGSALL \
 -DFMT_FUZZ_LINKMAIN=Off \
@@ -50,7 +52,7 @@ cmake --build $builddir
 builddir=$here/build-fuzzers-libfuzzer
 mkdir -p $builddir
 cd $builddir
-CXX="clang++" \
+CXX=$CLANG \
 CXXFLAGS="$CXXFLAGSALL -fsanitize=fuzzer-no-link,address,undefined" cmake \
 cmake $CMAKEFLAGSALL \
 -DFMT_FUZZ_LINKMAIN=Off \
@@ -62,7 +64,7 @@ cmake --build $builddir
 builddir=$here/build-fuzzers-fast
 mkdir -p $builddir
 cd $builddir
-CXX="clang++" \
+CXX=$CLANG \
 CXXFLAGS="$CXXFLAGSALL -fsanitize=fuzzer-no-link -O3" cmake \
 cmake $CMAKEFLAGSALL \
 -DFMT_FUZZ_LINKMAIN=Off \

externals/fmt/test/fuzzing/chrono-duration.cc

@@ -1,9 +1,10 @@
 // Copyright (c) 2019, Paul Dreik
 // For the license information refer to format.h.
 
-#include <cstdint>
 #include <fmt/chrono.h>
 
+#include <cstdint>
+
 #include "fuzzer-common.h"
 
 template <typename Period, typename Rep>
@@ -13,8 +14,8 @@ void invoke_inner(fmt::string_view format_str, Rep rep) {
 #if FMT_FUZZ_FORMAT_TO_STRING
     std::string message = fmt::format(format_str, value);
 #else
-    fmt::memory_buffer buf;
-    fmt::format_to(buf, format_str, value);
+    auto buf = fmt::memory_buffer();
+    fmt::format_to(std::back_inserter(buf), format_str, value);
 #endif
   } catch (std::exception&) {
   }
@@ -31,7 +32,7 @@ void invoke_outer(const uint8_t* data, size_t size, int period) {
   data += fixed_size;
   size -= fixed_size;
 
-  // data is already allocated separately in libFuzzer so reading past the end 
+  // data is already allocated separately in libFuzzer so reading past the end
   // will most likely be detected anyway.
   const auto format_str = fmt::string_view(as_chars(data), size);
 
@@ -86,7 +87,7 @@ void invoke_outer(const uint8_t* data, size_t size, int period) {
 }
 
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
-  if (size <= 4)  return 0;
+  if (size <= 4) return 0;
 
   const auto representation = data[0];
   const auto period = data[1];

externals/fmt/test/fuzzing/chrono-timepoint.cc

@@ -0,0 +1,32 @@
+// Copyright (c) 2021, Paul Dreik
+// For license information refer to format.h.
+#include <fmt/chrono.h>
+
+#include "fuzzer-common.h"
+
+/*
+ * a fuzzer for the chrono timepoints formatters
+ * C is a clock (std::chrono::system_clock etc)
+ */
+template <typename C> void doit(const uint8_t* data, size_t size) {
+  using Rep = typename C::time_point::rep;
+  constexpr auto N = sizeof(Rep);
+  if (size < N) return;
+
+  const auto x = assign_from_buf<Rep>(data);
+  typename C::duration dur{x};
+  typename C::time_point timepoint{dur};
+  data += N;
+  size -= N;
+  data_to_string format_str(data, size);
+
+  std::string message = fmt::format(format_str.get(), timepoint);
+}
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
+  try {
+    doit<std::chrono::system_clock>(data, size);
+  } catch (...) {
+  }
+  return 0;
+}

externals/fmt/test/fuzzing/float.cc

@@ -1,17 +1,18 @@
 // A fuzzer for floating-point formatter.
 // For the license information refer to format.h.
 
+#include <fmt/format.h>
+
 #include <cstdint>
 #include <cstdlib>
-#include <stdexcept>
 #include <limits>
-#include <fmt/format.h>
+#include <stdexcept>
 
 #include "fuzzer-common.h"
 
 void check_round_trip(fmt::string_view format_str, double value) {
   auto buffer = fmt::memory_buffer();
-  fmt::format_to(buffer, format_str, value);
+  fmt::format_to(std::back_inserter(buffer), format_str, value);
 
   if (std::isnan(value)) {
     auto nan = std::signbit(value) ? "-nan" : "nan";
@@ -24,8 +25,7 @@ void check_round_trip(fmt::string_view format_str, double value) {
   char* ptr = nullptr;
   if (std::strtod(buffer.data(), &ptr) != value)
     throw std::runtime_error("round trip failure");
-  if (ptr + 1 != buffer.end())
-    throw std::runtime_error("unparsed output");
+  if (ptr + 1 != buffer.end()) throw std::runtime_error("unparsed output");
 }
 
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {

externals/fmt/test/fuzzing/fuzzer-common.h

@@ -4,12 +4,12 @@
 #ifndef FUZZER_COMMON_H
 #define FUZZER_COMMON_H
 
-#include <cstdint>      // std::uint8_t
-#include <cstring>      // memcpy
-#include <vector>
-
 #include <fmt/core.h>
 
+#include <cstdint>  // std::uint8_t
+#include <cstring>  // memcpy
+#include <vector>
+
 // One can format to either a string, or a buffer. The latter is faster, but
 // one may be interested in formatting to a string instead to verify it works
 // as intended. To avoid a combinatoric explosion, select this at compile time
@@ -56,7 +56,9 @@ struct data_to_string {
 
   data_to_string(const uint8_t* data, size_t size, bool add_terminator = false)
       : buffer(size + (add_terminator ? 1 : 0)) {
-    std::memcpy(buffer.data(), data, size);
+    if (size) {
+      std::memcpy(buffer.data(), data, size);
+    }
   }
 
   fmt::string_view get() const { return {buffer.data(), buffer.size()}; }

externals/fmt/test/fuzzing/named-arg.cc

@@ -1,10 +1,11 @@
 // Copyright (c) 2019, Paul Dreik
 // For the license information refer to format.h.
 
+#include <fmt/chrono.h>
+
 #include <cstdint>
 #include <type_traits>
 #include <vector>
-#include <fmt/chrono.h>
 
 #include "fuzzer-common.h"
 
@@ -25,10 +26,11 @@ void invoke_fmt(const uint8_t* data, size_t size, unsigned arg_name_size) {
   try {
 #if FMT_FUZZ_FORMAT_TO_STRING
     std::string message =
-      fmt::format(format_str.get(), fmt::arg(arg_name.data(), value));
+        fmt::format(format_str.get(), fmt::arg(arg_name.data(), value));
 #else
     fmt::memory_buffer out;
-    fmt::format_to(out, format_str.get(), fmt::arg(arg_name.data(), value));
+    fmt::format_to(std::back_inserter(out), format_str.get(),
+                   fmt::arg(arg_name.data(), value));
 #endif
   } catch (std::exception&) {
   }

externals/fmt/test/fuzzing/one-arg.cc

@@ -1,17 +1,18 @@
 // Copyright (c) 2019, Paul Dreik
 // For the license information refer to format.h.
 
+#include <fmt/chrono.h>
+
 #include <cstdint>
 #include <exception>
-#include <fmt/chrono.h>
 
 #include "fuzzer-common.h"
 
-template <typename T, typename Repr>
-const T* from_repr(const Repr& r) { return &r; }
+template <typename T, typename Repr> const T* from_repr(const Repr& r) {
+  return &r;
+}
 
-template <>
-const std::tm* from_repr<std::tm>(const std::time_t& t) {
+template <> const std::tm* from_repr<std::tm>(const std::time_t& t) {
   return std::localtime(&t);
 }
 

externals/fmt/test/fuzzing/two-args.cc

@@ -1,10 +1,11 @@
 // Copyright (c) 2019, Paul Dreik
 // For the license information refer to format.h.
 
+#include <fmt/format.h>
+
 #include <cstdint>
 #include <exception>
 #include <string>
-#include <fmt/format.h>
 
 #include "fuzzer-common.h"
 

externals/fmt/test/gtest-extra.cc

@@ -32,11 +32,10 @@ output_redirect::~output_redirect() FMT_NOEXCEPT {
 }
 
 void output_redirect::flush() {
-#  if EOF != -1
-#    error "FMT_RETRY assumes return value of -1 indicating failure"
-#  endif
   int result = 0;
-  FMT_RETRY(result, fflush(file_));
+  do {
+    result = fflush(file_);
+  } while (result == EOF && errno == EINTR);
   if (result != 0) throw fmt::system_error(errno, "cannot flush stream");
 }
 

externals/fmt/test/gtest-extra.h

@@ -12,7 +12,12 @@
 
 #include <string>
 
-#include "fmt/os.h"
+#ifdef FMT_MODULE_TEST
+import fmt;
+#else
+#  include "fmt/os.h"
+#endif  // FMG_MODULE_TEST
+
 #include "gmock/gmock.h"
 
 #define FMT_TEST_THROW_(statement, expected_exception, expected_message, fail) \
@@ -129,6 +134,7 @@ class suppress_assert {
   ~suppress_assert() {
     _set_invalid_parameter_handler(original_handler_);
     _CrtSetReportMode(_CRT_ASSERT, original_report_mode_);
+    (void)original_report_mode_;
   }
 };
 

externals/fmt/test/gtest/CMakeLists.txt

@@ -17,6 +17,13 @@ else ()
   target_compile_definitions(gtest PUBLIC GTEST_HAS_PTHREAD=0)
 endif ()
 
+# Workaround GTest bug https://github.com/google/googletest/issues/705.
+check_cxx_compiler_flag(
+  -fno-delete-null-pointer-checks HAVE_FNO_DELETE_NULL_POINTER_CHECKS)
+if (HAVE_FNO_DELETE_NULL_POINTER_CHECKS)
+  target_compile_options(gtest PUBLIC -fno-delete-null-pointer-checks)
+endif ()
+
 if (MSVC)
   # Disable MSVC warnings of _CRT_INSECURE_DEPRECATE functions.
   target_compile_definitions(gtest PRIVATE _CRT_SECURE_NO_WARNINGS)

externals/fmt/test/header-only-test.cc

@@ -1,7 +1,11 @@
 // Header-only configuration test
 
 #include "fmt/core.h"
+#include "fmt/ostream.h"
+#include "gtest/gtest.h"
 
 #ifndef FMT_HEADER_ONLY
 #  error "Not in the header-only mode."
 #endif
+
+TEST(header_only_test, format) { EXPECT_EQ(fmt::format("foo"), "foo"); }

externals/fmt/test/module-test.cc

@@ -15,6 +15,8 @@
 #  define FMT_HIDE_MODULE_BUGS
 #endif
 
+#define FMT_MODULE_TEST
+
 #include <bit>
 #include <chrono>
 #include <exception>
@@ -35,18 +37,30 @@
 #  define FMT_USE_FCNTL 0
 #endif
 #define FMT_NOEXCEPT noexcept
+#if defined(_WIN32) && !defined(__MINGW32__)
+#  define FMT_POSIX(call) _##call
+#else
+#  define FMT_POSIX(call) call
+#endif
+#define FMT_OS_H_  // don't pull in os.h directly or indirectly
 
 import fmt;
 
 // check for macros leaking from BMI
 static bool macro_leaked =
-#if defined(FMT_CORE_H_) || defined(FMT_FORMAT_H)
+#if defined(FMT_CORE_H_) || defined(FMT_FORMAT_H_)
     true;
 #else
     false;
 #endif
 
-#include "gtest-extra.h"
+// Include sources to pick up functions and classes from the module rather than
+// from the non-modular library which is baked into the 'test-main' library.
+// This averts linker problems:
+// - strong ownership model: missing linker symbols
+// - weak ownership model: duplicate linker symbols
+#include "gtest-extra.cc"
+#include "util.cc"
 
 // an implicitly exported namespace must be visible [module.interface]/2.2
 TEST(module_test, namespace) {
@@ -62,8 +76,10 @@ bool oops_detail_namespace_is_visible;
 namespace fmt {
 bool namespace_detail_invisible() {
 #if defined(FMT_HIDE_MODULE_BUGS) && defined(_MSC_FULL_VER) && \
-    _MSC_FULL_VER <= 192930129
-  // bug in msvc up to 16.11-pre1:
+    ((_MSC_VER == 1929 && _MSC_FULL_VER <= 192930136) ||       \
+     (_MSC_VER == 1930 && _MSC_FULL_VER <= 193030704))
+  // bug in msvc up to 16.11.5 / 17.0-pre5:
+
   // the namespace is visible even when it is neither
   // implicitly nor explicitly exported
   return true;
@@ -83,8 +99,8 @@ TEST(module_test, detail_namespace) {
 // macros must not be imported from a *named* module  [cpp.import]/5.1
 TEST(module_test, macros) {
 #if defined(FMT_HIDE_MODULE_BUGS) && defined(_MSC_FULL_VER) && \
-    _MSC_FULL_VER <= 192930129
-  // bug in msvc up to 16.11-pre1:
+    _MSC_FULL_VER <= 192930130
+  // bug in msvc up to 16.11-pre2:
   // include-guard macros leak from BMI
   // and even worse: they cannot be #undef-ined
   macro_leaked = false;
@@ -442,8 +458,7 @@ TEST(module_test, time_duration) {
 }
 
 TEST(module_test, weekday) {
-  EXPECT_EQ("Monday",
-            std::format(std::locale::classic(), "{:%A}", fmt::weekday(1)));
+  EXPECT_EQ("Mon", fmt::format(std::locale::classic(), "{}", fmt::weekday(1)));
 }
 
 TEST(module_test, to_string_view) {

externals/fmt/test/noexception-test.cc

@@ -0,0 +1,18 @@
+// Formatting library for C++ - Noexception tests
+//
+// Copyright (c) 2012 - present, Victor Zverovich
+// All rights reserved.
+//
+// For the license information refer to format.h.
+
+#include "fmt/args.h"
+#include "fmt/chrono.h"
+#include "fmt/color.h"
+#include "fmt/compile.h"
+#include "fmt/core.h"
+#include "fmt/format.h"
+#include "fmt/os.h"
+#include "fmt/ostream.h"
+#include "fmt/printf.h"
+#include "fmt/ranges.h"
+#include "fmt/xchar.h"

externals/fmt/test/os-test.cc

@@ -41,9 +41,9 @@ TEST(util_test, utf16_to_utf8_empty_string) {
 }
 
 template <typename Converter, typename Char>
-void check_utf_conversion_error(
-    const char* message,
-    fmt::basic_string_view<Char> str = fmt::basic_string_view<Char>(0, 1)) {
+void check_utf_conversion_error(const char* message,
+                                fmt::basic_string_view<Char> str =
+                                    fmt::basic_string_view<Char>(nullptr, 1)) {
   fmt::memory_buffer out;
   fmt::detail::format_windows_error(out, ERROR_INVALID_PARAMETER, message);
   auto error = std::system_error(std::error_code());
@@ -63,7 +63,7 @@ TEST(util_test, utf16_to_utf8_error) {
 
 TEST(util_test, utf16_to_utf8_convert) {
   fmt::detail::utf16_to_utf8 u;
-  EXPECT_EQ(ERROR_INVALID_PARAMETER, u.convert(wstring_view(0, 1)));
+  EXPECT_EQ(ERROR_INVALID_PARAMETER, u.convert(wstring_view(nullptr, 1)));
   EXPECT_EQ(ERROR_INVALID_PARAMETER,
             u.convert(wstring_view(L"foo", INT_MAX + 1u)));
 }
@@ -81,12 +81,12 @@ TEST(os_test, format_std_error_code) {
 }
 
 TEST(os_test, format_windows_error) {
-  LPWSTR message = 0;
+  LPWSTR message = nullptr;
   auto result = FormatMessageW(
       FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM |
           FORMAT_MESSAGE_IGNORE_INSERTS,
-      0, ERROR_FILE_EXISTS, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
-      reinterpret_cast<LPWSTR>(&message), 0, 0);
+      nullptr, ERROR_FILE_EXISTS, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
+      reinterpret_cast<LPWSTR>(&message), 0, nullptr);
   fmt::detail::utf16_to_utf8 utf8_message(wstring_view(message, result - 2));
   LocalFree(message);
   fmt::memory_buffer actual_message;
@@ -97,17 +97,17 @@ TEST(os_test, format_windows_error) {
 }
 
 TEST(os_test, format_long_windows_error) {
-  LPWSTR message = 0;
+  LPWSTR message = nullptr;
   // this error code is not available on all Windows platforms and
   // Windows SDKs, so do not fail the test if the error string cannot
   // be retrieved.
   int provisioning_not_allowed = 0x80284013L;  // TBS_E_PROVISIONING_NOT_ALLOWED
-  auto result = FormatMessageW(FORMAT_MESSAGE_ALLOCATE_BUFFER |
-                                   FORMAT_MESSAGE_FROM_SYSTEM |
-                                   FORMAT_MESSAGE_IGNORE_INSERTS,
-                               0, static_cast<DWORD>(provisioning_not_allowed),
-                               MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
-                               reinterpret_cast<LPWSTR>(&message), 0, 0);
+  auto result = FormatMessageW(
+      FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM |
+          FORMAT_MESSAGE_IGNORE_INSERTS,
+      nullptr, static_cast<DWORD>(provisioning_not_allowed),
+      MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
+      reinterpret_cast<LPWSTR>(&message), 0, nullptr);
   if (result == 0) {
     LocalFree(message);
     return;
@@ -336,6 +336,14 @@ TEST(ostream_test, truncate) {
   EXPECT_EQ("foo", read(in, 4));
 }
 
+TEST(ostream_test, flush) {
+  auto out = fmt::output_file("test-file");
+  out.print("x");
+  out.flush();
+  auto in = fmt::file("test-file", file::RDONLY);
+  EXPECT_READ(in, "x");
+}
+
 TEST(file_test, default_ctor) {
   file f;
   EXPECT_EQ(-1, f.descriptor());
@@ -540,13 +548,4 @@ TEST(file_test, fdopen) {
   int read_fd = read_end.descriptor();
   EXPECT_EQ(read_fd, FMT_POSIX(fileno(read_end.fdopen("r").get())));
 }
-
-#  ifdef FMT_LOCALE
-TEST(locale_test, strtod) {
-  fmt::locale loc;
-  const char *start = "4.2", *ptr = start;
-  EXPECT_EQ(4.2, loc.strtod(ptr));
-  EXPECT_EQ(start + 3, ptr);
-}
-#  endif
 #endif  // FMT_USE_FCNTL

externals/fmt/test/ostream-test.cc

@@ -23,6 +23,7 @@ template <> struct formatter<test> : formatter<int> {
 
 #include <sstream>
 
+#include "fmt/compile.h"
 #include "fmt/ostream.h"
 #include "fmt/ranges.h"
 #include "gmock/gmock.h"
@@ -69,16 +70,16 @@ TEST(ostream_test, format_specs) {
   EXPECT_EQ("  def", fmt::format("{0:>5}", test_string("def")));
   EXPECT_EQ(" def ", fmt::format("{0:^5}", test_string("def")));
   EXPECT_EQ("def**", fmt::format("{0:*<5}", test_string("def")));
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:+}"), test_string()), format_error,
-                   "format specifier requires numeric argument");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:-}"), test_string()), format_error,
-                   "format specifier requires numeric argument");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0: }"), test_string()), format_error,
-                   "format specifier requires numeric argument");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:#}"), test_string()), format_error,
-                   "format specifier requires numeric argument");
-  EXPECT_THROW_MSG(fmt::format(runtime("{0:05}"), test_string()), format_error,
-                   "format specifier requires numeric argument");
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:+}"), test_string()),
+                   format_error, "format specifier requires numeric argument");
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:-}"), test_string()),
+                   format_error, "format specifier requires numeric argument");
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0: }"), test_string()),
+                   format_error, "format specifier requires numeric argument");
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:#}"), test_string()),
+                   format_error, "format specifier requires numeric argument");
+  EXPECT_THROW_MSG((void)fmt::format(runtime("{0:05}"), test_string()),
+                   format_error, "format specifier requires numeric argument");
   EXPECT_EQ("test         ", fmt::format("{0:13}", test_string("test")));
   EXPECT_EQ("test         ", fmt::format("{0:{1}}", test_string("test"), 13));
   EXPECT_EQ("te", fmt::format("{0:.2}", test_string("test")));
@@ -115,12 +116,12 @@ TEST(ostream_test, write_to_ostream_max_size) {
   struct test_buffer final : fmt::detail::buffer<char> {
     explicit test_buffer(size_t size)
         : fmt::detail::buffer<char>(nullptr, size, size) {}
-    void grow(size_t) {}
+    void grow(size_t) override {}
   } buffer(max_size);
 
   struct mock_streambuf : std::streambuf {
     MOCK_METHOD2(xsputn, std::streamsize(const void* s, std::streamsize n));
-    std::streamsize xsputn(const char* s, std::streamsize n) {
+    std::streamsize xsputn(const char* s, std::streamsize n) override {
       const void* v = s;
       return xsputn(v, n);
     }
@@ -257,7 +258,8 @@ std::ostream& operator<<(std::ostream& os, streamable_and_convertible_to_bool) {
 }
 
 TEST(ostream_test, format_convertible_to_bool) {
-  EXPECT_EQ("foo", fmt::format("{}", streamable_and_convertible_to_bool()));
+  // operator<< is intentionally not used because of potential ODR violations.
+  EXPECT_EQ(fmt::format("{}", streamable_and_convertible_to_bool()), "true");
 }
 
 struct copyfmt_test {};
@@ -280,3 +282,20 @@ TEST(ostream_test, range) {
   auto strs = std::vector<test_string>{test_string("foo"), test_string("bar")};
   EXPECT_EQ("[foo, bar]", fmt::format("{}", strs));
 }
+
+struct abstract {
+  virtual ~abstract() = default;
+  virtual void f() = 0;
+  friend std::ostream& operator<<(std::ostream& os, const abstract&) {
+    return os;
+  }
+};
+
+void format_abstract_compiles(const abstract& a) {
+  fmt::format(FMT_COMPILE("{}"), a);
+}
+
+TEST(ostream_test, is_formattable) {
+  EXPECT_TRUE(fmt::is_formattable<std::string>());
+  EXPECT_TRUE(fmt::is_formattable<fmt::detail::std_string_view<char>>());
+}

externals/fmt/test/posix-mock-test.cc

@@ -467,9 +467,6 @@ struct locale_mock {
   MOCK_METHOD3(newlocale, locale_type(int category_mask, const char* locale,
                                       locale_type base));
   MOCK_METHOD1(freelocale, void(locale_type locale));
-
-  MOCK_METHOD3(strtod_l,
-               double(const char* nptr, char** endptr, locale_type locale));
 } * locale_mock::instance;
 
 #  ifdef _MSC_VER
@@ -487,10 +484,6 @@ _locale_t _create_locale(int category, const char* locale) {
 void _free_locale(_locale_t locale) {
   locale_mock::instance->freelocale(locale);
 }
-
-double _strtod_l(const char* nptr, char** endptr, _locale_t locale) {
-  return locale_mock::instance->strtod_l(nptr, endptr, locale);
-}
 #    ifdef __clang__
 #      pragma clang diagnostic pop
 #    endif
@@ -516,11 +509,6 @@ FreeLocaleResult freelocale(locale_type locale) FMT_LOCALE_THROW {
   return FreeLocaleResult();
 }
 
-double strtod_l(const char* nptr, char** endptr,
-                locale_type locale) FMT_LOCALE_THROW {
-  return locale_mock::instance->strtod_l(nptr, endptr, locale);
-}
-
 #  undef FMT_LOCALE_THROW
 
 #  ifndef _WIN32
@@ -549,18 +537,4 @@ TEST(locale_test, locale) {
   EXPECT_EQ(impl, loc.get());
 }
 
-TEST(locale_test, strtod) {
-  scoped_mock<locale_mock> mock;
-  EXPECT_CALL(mock, newlocale(_, _, _))
-      .WillOnce(Return(reinterpret_cast<locale_type>(42)));
-  EXPECT_CALL(mock, freelocale(_));
-  fmt::locale loc;
-  const char* str = "4.2";
-  char end = 'x';
-  EXPECT_CALL(mock, strtod_l(str, _, loc.get()))
-      .WillOnce(testing::DoAll(testing::SetArgPointee<1>(&end), Return(777)));
-  EXPECT_EQ(777, loc.strtod(str));
-  EXPECT_EQ(&end, str);
-}
-
 #endif  // FMT_LOCALE

externals/fmt/test/printf-test.cc

@@ -481,12 +481,6 @@ TEST(printf_test, string) {
   EXPECT_PRINTF(L"    (null)", L"%10s", null_wstr);
 }
 
-TEST(printf_test, uchar_string) {
-  unsigned char str[] = "test";
-  unsigned char* pstr = str;
-  EXPECT_EQ("test", fmt::sprintf("%s", pstr));
-}
-
 TEST(printf_test, pointer) {
   int n;
   void* p = &n;

externals/fmt/test/ranges-odr-test.cc

@@ -0,0 +1,17 @@
+// Formatting library for C++ - the core API
+//
+// Copyright (c) 2012 - present, Victor Zverovich
+// All rights reserved.
+//
+// For the license information refer to format.h.
+
+#include <vector>
+
+#include "fmt/ranges.h"
+#include "gtest/gtest.h"
+
+// call fmt::format from another translation unit to test ODR
+TEST(ranges_odr_test, format_vector) {
+  auto v = std::vector<int>{1, 2, 3, 5, 7, 11};
+  EXPECT_EQ(fmt::format("{}", v), "[1, 2, 3, 5, 7, 11]");
+}

externals/fmt/test/ranges-test.cc

@@ -55,7 +55,12 @@ TEST(ranges_test, format_vector2) {
 
 TEST(ranges_test, format_map) {
   auto m = std::map<std::string, int>{{"one", 1}, {"two", 2}};
-  EXPECT_EQ(fmt::format("{}", m), "[(\"one\", 1), (\"two\", 2)]");
+  EXPECT_EQ(fmt::format("{}", m), "{\"one\": 1, \"two\": 2}");
+}
+
+TEST(ranges_test, format_set) {
+  EXPECT_EQ(fmt::format("{}", std::set<std::string>{"one", "two"}),
+            "{\"one\", \"two\"}");
 }
 
 TEST(ranges_test, format_pair) {
@@ -190,7 +195,14 @@ TEST(ranges_test, range) {
   EXPECT_EQ(fmt::format("{}", z), "[0, 0, 0]");
 }
 
-#if !FMT_MSC_VER || FMT_MSC_VER >= 1927
+enum test_enum { foo };
+
+TEST(ranges_test, enum_range) {
+  auto v = std::vector<test_enum>{test_enum::foo};
+  EXPECT_EQ(fmt::format("{}", v), "[0]");
+}
+
+#if !FMT_MSC_VER
 struct unformattable {};
 
 TEST(ranges_test, unformattable_range) {
@@ -217,6 +229,21 @@ TEST(ranges_test, join_tuple) {
   // Single element tuple.
   auto t4 = std::tuple<float>(4.0f);
   EXPECT_EQ(fmt::format("{}", fmt::join(t4, "/")), "4");
+
+#  if FMT_TUPLE_JOIN_SPECIFIERS
+  // Specs applied to each element.
+  auto t5 = std::tuple<int, int, long>(-3, 100, 1);
+  EXPECT_EQ(fmt::format("{:+03}", fmt::join(t5, ", ")), "-03, +100, +01");
+
+  auto t6 = std::tuple<float, double, long double>(3, 3.14, 3.1415);
+  EXPECT_EQ(fmt::format("{:5.5f}", fmt::join(t6, ", ")),
+            "3.00000, 3.14000, 3.14150");
+
+  // Testing lvalue tuple args.
+  int y = -1;
+  auto t7 = std::tuple<int, int&, const int&>(3, y, y);
+  EXPECT_EQ(fmt::format("{:03}", fmt::join(t7, ", ")), "003, -01, -01");
+#  endif
 }
 
 TEST(ranges_test, join_initializer_list) {
@@ -236,6 +263,36 @@ struct zstring {
   zstring_sentinel end() const { return {}; }
 };
 
+#  ifdef __cpp_lib_ranges
+struct cpp20_only_range {
+  struct iterator {
+    int val = 0;
+
+    using value_type = int;
+    using difference_type = std::ptrdiff_t;
+    using iterator_concept = std::input_iterator_tag;
+
+    iterator() = default;
+    iterator(int i) : val(i) {}
+    int operator*() const { return val; }
+    iterator& operator++() {
+      ++val;
+      return *this;
+    }
+    void operator++(int) { ++*this; }
+    bool operator==(const iterator& rhs) const { return val == rhs.val; }
+  };
+
+  int lo;
+  int hi;
+
+  iterator begin() const { return iterator(lo); }
+  iterator end() const { return iterator(hi); }
+};
+
+static_assert(std::input_iterator<cpp20_only_range::iterator>);
+#  endif
+
 TEST(ranges_test, join_sentinel) {
   auto hello = zstring{"hello"};
   EXPECT_EQ(fmt::format("{}", hello), "['h', 'e', 'l', 'l', 'o']");
@@ -260,5 +317,47 @@ TEST(ranges_test, join_range) {
 
   const auto z = std::vector<int>(3u, 0);
   EXPECT_EQ(fmt::format("{}", fmt::join(z, ",")), "0,0,0");
+
+#  ifdef __cpp_lib_ranges
+  EXPECT_EQ(fmt::format("{}", cpp20_only_range{.lo = 0, .hi = 5}),
+            "[0, 1, 2, 3, 4]");
+  EXPECT_EQ(
+      fmt::format("{}", fmt::join(cpp20_only_range{.lo = 0, .hi = 5}, ",")),
+      "0,1,2,3,4");
+#  endif
 }
 #endif  // FMT_RANGES_TEST_ENABLE_JOIN
+
+TEST(ranges_test, is_printable) {
+  using fmt::detail::is_printable;
+  EXPECT_TRUE(is_printable(0x0323));
+  EXPECT_FALSE(is_printable(0x0378));
+  EXPECT_FALSE(is_printable(0x110000));
+}
+
+TEST(ranges_test, escape_string) {
+  using vec = std::vector<std::string>;
+  EXPECT_EQ(fmt::format("{}", vec{"\n\r\t\"\\"}), "[\"\\n\\r\\t\\\"\\\\\"]");
+  EXPECT_EQ(fmt::format("{}", vec{"\x07"}), "[\"\\x07\"]");
+  EXPECT_EQ(fmt::format("{}", vec{"\x7f"}), "[\"\\x7f\"]");
+  EXPECT_EQ(fmt::format("{}", vec{"n\xcc\x83"}), "[\"n\xcc\x83\"]");
+
+  if (fmt::detail::is_utf8()) {
+    EXPECT_EQ(fmt::format("{}", vec{"\xcd\xb8"}), "[\"\\u0378\"]");
+    // Unassigned Unicode code points.
+    EXPECT_EQ(fmt::format("{}", vec{"\xf0\xaa\x9b\x9e"}), "[\"\\U0002a6de\"]");
+    EXPECT_EQ(fmt::format("{}", vec{"\xf4\x8f\xbf\xc0"}),
+              "[\"\\xf4\\x8f\\xbf\\xc0\"]");
+  }
+}
+
+#ifdef FMT_USE_STRING_VIEW
+struct convertible_to_string_view {
+  operator std::string_view() const { return "foo"; }
+};
+
+TEST(ranges_test, escape_convertible_to_string_view) {
+  EXPECT_EQ(fmt::format("{}", std::vector<convertible_to_string_view>(1)),
+            "[\"foo\"]");
+}
+#endif  // FMT_USE_STRING_VIEW

externals/fmt/test/std-format-test.cc

@@ -1,161 +0,0 @@
-#include <format>
-
-#include "gtest/gtest.h"
-
-TEST(std_format_test, escaping) {
-  using namespace std;
-  string s = format("{0}-{{", 8);  // s == "8-{"
-  EXPECT_EQ(s, "8-{");
-}
-
-TEST(std_format_test, indexing) {
-  using namespace std;
-  string s0 = format("{} to {}", "a", "b");    // OK: automatic indexing
-  string s1 = format("{1} to {0}", "a", "b");  // OK: manual indexing
-  EXPECT_EQ(s0, "a to b");
-  EXPECT_EQ(s1, "b to a");
-  // Error: mixing automatic and manual indexing
-  EXPECT_THROW(string s2 = format("{0} to {}", "a", "b"), std::format_error);
-  // Error: mixing automatic and manual indexing
-  EXPECT_THROW(string s3 = format("{} to {1}", "a", "b"), std::format_error);
-}
-
-TEST(std_format_test, alignment) {
-  using namespace std;
-  char c = 120;
-  string s0 = format("{:6}", 42);     // s0 == "    42"
-  string s1 = format("{:6}", 'x');    // s1 == "x     "
-  string s2 = format("{:*<6}", 'x');  // s2 == "x*****"
-  string s3 = format("{:*>6}", 'x');  // s3 == "*****x"
-  string s4 = format("{:*^6}", 'x');  // s4 == "**x***"
-  // Error: '=' with charT and no integer presentation type
-  EXPECT_THROW(string s5 = format("{:=6}", 'x'), std::format_error);
-  string s6 = format("{:6d}", c);    // s6 == "   120"
-  string s7 = format("{:6}", true);  // s9 == "true  "
-  EXPECT_EQ(s0, "    42");
-  EXPECT_EQ(s1, "x     ");
-  EXPECT_EQ(s2, "x*****");
-  EXPECT_EQ(s3, "*****x");
-  EXPECT_EQ(s4, "**x***");
-  EXPECT_EQ(s6, "   120");
-  EXPECT_EQ(s7, "true  ");
-}
-
-TEST(std_format_test, float) {
-  using namespace std;
-  double inf = numeric_limits<double>::infinity();
-  double nan = numeric_limits<double>::quiet_NaN();
-  string s0 = format("{0:} {0:+} {0:-} {0: }", 1);   // s0 == "1 +1 1  1"
-  string s1 = format("{0:} {0:+} {0:-} {0: }", -1);  // s1 == "-1 -1 -1 -1"
-  string s2 =
-      format("{0:} {0:+} {0:-} {0: }", inf);  // s2 == "inf +inf inf  inf"
-  string s3 =
-      format("{0:} {0:+} {0:-} {0: }", nan);  // s3 == "nan +nan nan  nan"
-  EXPECT_EQ(s0, "1 +1 1  1");
-  EXPECT_EQ(s1, "-1 -1 -1 -1");
-  EXPECT_EQ(s2, "inf +inf inf  inf");
-  EXPECT_EQ(s3, "nan +nan nan  nan");
-}
-
-TEST(std_format_test, int) {
-  using namespace std;
-  string s0 = format("{}", 42);                       // s0 == "42"
-  string s1 = format("{0:b} {0:d} {0:o} {0:x}", 42);  // s1 == "101010 42 52 2a"
-  string s2 = format("{0:#x} {0:#X}", 42);            // s2 == "0x2a 0X2A"
-  string s3 = format("{:L}", 1234);  // s3 == "1234" (depends on the locale)
-  EXPECT_EQ(s0, "42");
-  EXPECT_EQ(s1, "101010 42 52 2a");
-  EXPECT_EQ(s2, "0x2a 0X2A");
-  EXPECT_EQ(s3, "1234");
-}
-
-#include <format>
-
-enum color { red, green, blue };
-
-const char* color_names[] = {"red", "green", "blue"};
-
-template <> struct std::formatter<color> : std::formatter<const char*> {
-  auto format(color c, format_context& ctx) {
-    return formatter<const char*>::format(color_names[c], ctx);
-  }
-};
-
-struct err {};
-
-TEST(std_format_test, formatter) {
-  std::string s0 = std::format("{}", 42);  // OK: library-provided formatter
-  // std::string s1 = std::format("{}", L"foo"); // Ill-formed: disabled
-  // formatter
-  std::string s2 = std::format("{}", red);  // OK: user-provided formatter
-  // std::string s3 = std::format("{}", err{});  // Ill-formed: disabled
-  // formatter
-  EXPECT_EQ(s0, "42");
-  EXPECT_EQ(s2, "red");
-}
-
-struct S {
-  int value;
-};
-
-template <> struct std::formatter<S> {
-  size_t width_arg_id = 0;
-
-  // Parses a width argument id in the format { <digit> }.
-  constexpr auto parse(format_parse_context& ctx) {
-    constexpr auto is_ascii_digit = [](const char c) {
-      return c >= '0' && c <= '9';
-    };
-
-    auto iter = ctx.begin();
-    // auto get_char = [&]() { return iter != ctx.end() ? *iter : 0; };
-    auto get_char = [&]() { return iter != ctx.end() ? *iter : '\0'; };
-    if (get_char() != '{') return iter;
-    ++iter;
-    char c = get_char();
-    if (!is_ascii_digit(c) || (++iter, get_char()) != '}')
-      throw format_error("invalid format");
-    width_arg_id = fmt::detail::to_unsigned(c - '0');
-    ctx.check_arg_id(width_arg_id);
-    return ++iter;
-  }
-
-  // Formats S with width given by the argument width_arg_id.
-  auto format(S s, format_context& ctx) {
-    int width = visit_format_arg(
-        [](auto value) -> int {
-          using type = decltype(value);
-          if constexpr (!is_integral_v<type> || is_same_v<type, bool>)
-            throw format_error("width is not integral");
-          // else if (value < 0 || value > numeric_limits<int>::max())
-          else if (fmt::detail::is_negative(value) ||
-                   value > numeric_limits<int>::max())
-            throw format_error("invalid width");
-          else
-            return static_cast<int>(value);
-        },
-        ctx.arg(width_arg_id));
-    return format_to(ctx.out(), "{0:{1}}", s.value, width);
-  }
-};
-
-TEST(std_format_test, parsing) {
-  std::string s = std::format("{0:{1}}", S{42}, 10);  // s == "        42"
-  EXPECT_EQ(s, "        42");
-}
-
-#if FMT_USE_INT128
-template <> struct std::formatter<__int128_t> : std::formatter<long long> {
-  auto format(__int128_t n, format_context& ctx) {
-    // Format as a long long since we only want to check if it is possible to
-    // specialize formatter for __int128_t.
-    return formatter<long long>::format(static_cast<long long>(n), ctx);
-  }
-};
-
-TEST(std_format_test, int128) {
-  __int128_t n = 42;
-  auto s = std::format("{}", n);
-  EXPECT_EQ(s, "42");
-}
-#endif  // FMT_USE_INT128

externals/fmt/test/test-main.cc

@@ -35,6 +35,7 @@ int main(int argc, char** argv) {
   _CrtSetReportFile(_CRT_ASSERT, _CRTDBG_FILE_STDERR);
   try {
     testing::InitGoogleTest(&argc, argv);
+    testing::FLAGS_gtest_death_test_style = "threadsafe";
     return RUN_ALL_TESTS();
   } catch (...) {
     // Catch all exceptions to make Coverity happy.

externals/fmt/test/unicode-test.cc

@@ -18,7 +18,7 @@ using testing::Contains;
 TEST(unicode_test, is_utf8) { EXPECT_TRUE(fmt::detail::is_utf8()); }
 
 TEST(unicode_test, legacy_locale) {
-  auto loc = get_locale("ru_RU.CP1251", "Russian.1251");
+  auto loc = get_locale("ru_RU.CP1251", "Russian_Russia.1251");
   if (loc == std::locale::classic()) return;
 
   auto s = std::string();

externals/fmt/test/util.h

@@ -10,7 +10,11 @@
 #include <locale>
 #include <string>
 
-#include "fmt/os.h"
+#ifdef FMT_MODULE_TEST
+import fmt;
+#else
+#  include "fmt/os.h"
+#endif  // FMT_MODULE_TEST
 
 #ifdef _MSC_VER
 #  define FMT_VSNPRINTF vsprintf_s
@@ -34,7 +38,7 @@ fmt::buffered_file open_buffered_file(FILE** fp = nullptr);
 inline FILE* safe_fopen(const char* filename, const char* mode) {
 #if defined(_WIN32) && !defined(__MINGW32__)
   // Fix MSVC warning about "unsafe" fopen.
-  FILE* f = 0;
+  FILE* f = nullptr;
   errno = fopen_s(&f, filename, mode);
   return f;
 #else

externals/fmt/test/xchar-test.cc

@@ -8,14 +8,18 @@
 #include "fmt/xchar.h"
 
 #include <complex>
+#include <cwchar>
+#include <vector>
 
 #include "fmt/chrono.h"
 #include "fmt/color.h"
 #include "fmt/ostream.h"
 #include "fmt/ranges.h"
-#include "gtest/gtest.h"
+#include "gtest-extra.h"  // Contains
+#include "util.h"         // get_locale
 
 using fmt::detail::max_value;
+using testing::Contains;
 
 namespace test_ns {
 template <typename Char> class test_string {
@@ -87,6 +91,10 @@ TEST(xchar_test, format) {
   EXPECT_EQ(L"abc1", fmt::format(L"{}c{}", L"ab", 1));
 }
 
+TEST(xchar_test, is_formattable) {
+  static_assert(!fmt::is_formattable<const wchar_t*>::value, "");
+}
+
 TEST(xchar_test, compile_time_string) {
 #if defined(FMT_USE_STRING_VIEW) && __cplusplus >= 201703L
   EXPECT_EQ(L"42", fmt::format(FMT_STRING(std::wstring_view(L"{}")), 42));
@@ -257,6 +265,55 @@ TEST(xchar_test, chrono) {
   EXPECT_EQ(fmt::format("The date is {:%Y-%m-%d %H:%M:%S}.", tm),
             "The date is 2016-04-25 11:22:33.");
   EXPECT_EQ(L"42s", fmt::format(L"{}", std::chrono::seconds(42)));
+  EXPECT_EQ(fmt::format(L"{:%F}", tm), L"2016-04-25");
+  EXPECT_EQ(fmt::format(L"{:%T}", tm), L"11:22:33");
+}
+
+std::wstring system_wcsftime(const std::wstring& format, const std::tm* timeptr,
+                             std::locale* locptr = nullptr) {
+  auto loc = locptr ? *locptr : std::locale::classic();
+  auto& facet = std::use_facet<std::time_put<wchar_t>>(loc);
+  std::wostringstream os;
+  os.imbue(loc);
+  facet.put(os, os, L' ', timeptr, format.c_str(),
+            format.c_str() + format.size());
+#ifdef _WIN32
+  // Workaround a bug in older versions of Universal CRT.
+  auto str = os.str();
+  if (str == L"-0000") str = L"+0000";
+  return str;
+#else
+  return os.str();
+#endif
+}
+
+TEST(chrono_test, time_point) {
+  auto t1 = std::chrono::system_clock::now();
+
+  std::vector<std::wstring> spec_list = {
+      L"%%",  L"%n",  L"%t",  L"%Y",  L"%EY", L"%y",  L"%Oy", L"%Ey", L"%C",
+      L"%EC", L"%G",  L"%g",  L"%b",  L"%h",  L"%B",  L"%m",  L"%Om", L"%U",
+      L"%OU", L"%W",  L"%OW", L"%V",  L"%OV", L"%j",  L"%d",  L"%Od", L"%e",
+      L"%Oe", L"%a",  L"%A",  L"%w",  L"%Ow", L"%u",  L"%Ou", L"%H",  L"%OH",
+      L"%I",  L"%OI", L"%M",  L"%OM", L"%S",  L"%OS", L"%x",  L"%Ex", L"%X",
+      L"%EX", L"%D",  L"%F",  L"%R",  L"%T",  L"%p",  L"%z",  L"%Z"};
+  spec_list.push_back(L"%Y-%m-%d %H:%M:%S");
+#ifndef _WIN32
+  // Disabled on Windows, because these formats is not consistent among
+  // platforms.
+  spec_list.insert(spec_list.end(), {L"%c", L"%Ec", L"%r"});
+#endif
+
+  for (const auto& spec : spec_list) {
+    auto t = std::chrono::system_clock::to_time_t(t1);
+    auto tm = *std::localtime(&t);
+
+    auto sys_output = system_wcsftime(spec, &tm);
+
+    auto fmt_spec = fmt::format(L"{{:{}}}", spec);
+    EXPECT_EQ(sys_output, fmt::format(fmt_spec, t1));
+    EXPECT_EQ(sys_output, fmt::format(fmt_spec, tm));
+  }
 }
 
 TEST(xchar_test, color) {
@@ -301,10 +358,12 @@ template <typename Char> struct small_grouping : std::numpunct<Char> {
   Char do_thousands_sep() const override { return ','; }
 };
 
-TEST(locale_test, double_decimal_point) {
+TEST(locale_test, localized_double) {
   auto loc = std::locale(std::locale(), new numpunct<char>());
   EXPECT_EQ("1?23", fmt::format(loc, "{:L}", 1.23));
   EXPECT_EQ("1?230000", fmt::format(loc, "{:Lf}", 1.23));
+  EXPECT_EQ("1~234?5", fmt::format(loc, "{:L}", 1234.5));
+  EXPECT_EQ("12~000", fmt::format(loc, "{:L}", 12000.0));
 }
 
 TEST(locale_test, format) {
@@ -403,7 +462,7 @@ template <class charT> struct formatter<std::complex<double>, charT> {
         specs_.precision, specs_.precision_ref, ctx);
     auto specs = std::string();
     if (specs_.precision > 0) specs = fmt::format(".{}", specs_.precision);
-    if (specs_.type) specs += specs_.type;
+    if (specs_.type == presentation_type::fixed_lower) specs += 'f';
     auto real = fmt::format(ctx.locale().template get<std::locale>(),
                             fmt::runtime("{:" + specs + "}"), c.real());
     auto imag = fmt::format(ctx.locale().template get<std::locale>(),
@@ -424,4 +483,20 @@ TEST(locale_test, complex) {
   EXPECT_EQ(fmt::format("{:8}", std::complex<double>(1, 2)), "  (1+2i)");
 }
 
+TEST(locale_test, chrono_weekday) {
+  auto loc = get_locale("ru_RU.UTF-8", "Russian_Russia.1251");
+  auto loc_old = std::locale::global(loc);
+  auto mon = fmt::weekday(1);
+  EXPECT_EQ(fmt::format(L"{}", mon), L"Mon");
+  if (loc != std::locale::classic()) {
+    // {L"\x43F\x43D", L"\x41F\x43D", L"\x43F\x43D\x434", L"\x41F\x43D\x434"}
+    // {L"пн", L"Пн", L"пнд", L"Пнд"}
+    EXPECT_THAT(
+        (std::vector<std::wstring>{L"\x43F\x43D", L"\x41F\x43D",
+                                   L"\x43F\x43D\x434", L"\x41F\x43D\x434"}),
+        Contains(fmt::format(loc, L"{:L}", mon)));
+  }
+  std::locale::global(loc_old);
+}
+
 #endif  // FMT_STATIC_THOUSANDS_SEPARATOR