97 lines
2.7 KiB
CMake
97 lines
2.7 KiB
CMake
# C++14 feature support detection
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include(CheckCXXSourceCompiles)
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include(CheckCXXCompilerFlag)
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if (NOT CMAKE_CXX_STANDARD)
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set(CMAKE_CXX_STANDARD 11)
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endif()
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message(STATUS "CXX_STANDARD: ${CMAKE_CXX_STANDARD}")
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if (CMAKE_CXX_STANDARD EQUAL 20)
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check_cxx_compiler_flag(-std=c++20 has_std_20_flag)
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check_cxx_compiler_flag(-std=c++2a has_std_2a_flag)
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if (has_std_20_flag)
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set(CXX_STANDARD_FLAG -std=c++20)
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elseif (has_std_2a_flag)
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set(CXX_STANDARD_FLAG -std=c++2a)
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endif ()
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elseif (CMAKE_CXX_STANDARD EQUAL 17)
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check_cxx_compiler_flag(-std=c++17 has_std_17_flag)
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check_cxx_compiler_flag(-std=c++1z has_std_1z_flag)
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if (has_std_17_flag)
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set(CXX_STANDARD_FLAG -std=c++17)
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elseif (has_std_1z_flag)
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set(CXX_STANDARD_FLAG -std=c++1z)
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endif ()
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elseif (CMAKE_CXX_STANDARD EQUAL 14)
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check_cxx_compiler_flag(-std=c++14 has_std_14_flag)
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check_cxx_compiler_flag(-std=c++1y has_std_1y_flag)
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if (has_std_14_flag)
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set(CXX_STANDARD_FLAG -std=c++14)
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elseif (has_std_1y_flag)
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set(CXX_STANDARD_FLAG -std=c++1y)
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endif ()
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elseif (CMAKE_CXX_STANDARD EQUAL 11)
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check_cxx_compiler_flag(-std=c++11 has_std_11_flag)
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check_cxx_compiler_flag(-std=c++0x has_std_0x_flag)
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if (has_std_11_flag)
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set(CXX_STANDARD_FLAG -std=c++11)
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elseif (has_std_0x_flag)
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set(CXX_STANDARD_FLAG -std=c++0x)
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endif ()
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endif ()
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set(CMAKE_REQUIRED_FLAGS ${CXX_STANDARD_FLAG})
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# Check if variadic templates are working and not affected by GCC bug 39653:
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# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=39653
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check_cxx_source_compiles("
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template <class T, class ...Types>
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struct S { typedef typename S<Types...>::type type; };
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int main() {}" SUPPORTS_VARIADIC_TEMPLATES)
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if (NOT SUPPORTS_VARIADIC_TEMPLATES)
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set (SUPPORTS_VARIADIC_TEMPLATES OFF)
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endif ()
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# Check if initializer lists are supported.
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check_cxx_source_compiles("
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#include <initializer_list>
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int main() {}" SUPPORTS_INITIALIZER_LIST)
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if (NOT SUPPORTS_INITIALIZER_LIST)
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set (SUPPORTS_INITIALIZER_LIST OFF)
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endif ()
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# Check if enum bases are available
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check_cxx_source_compiles("
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enum C : char {A};
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int main() {}"
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SUPPORTS_ENUM_BASE)
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if (NOT SUPPORTS_ENUM_BASE)
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set (SUPPORTS_ENUM_BASE OFF)
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endif ()
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# Check if type traits are available
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check_cxx_source_compiles("
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#include <type_traits>
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class C { void operator=(const C&); };
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int main() { static_assert(!std::is_copy_assignable<C>::value, \"\"); }"
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SUPPORTS_TYPE_TRAITS)
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if (NOT SUPPORTS_TYPE_TRAITS)
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set (SUPPORTS_TYPE_TRAITS OFF)
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endif ()
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# Check if user-defined literals are available
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check_cxx_source_compiles("
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void operator\"\" _udl(long double);
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int main() {}"
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SUPPORTS_USER_DEFINED_LITERALS)
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if (NOT SUPPORTS_USER_DEFINED_LITERALS)
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set (SUPPORTS_USER_DEFINED_LITERALS OFF)
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endif ()
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set(CMAKE_REQUIRED_FLAGS )
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