mirror of
https://github.com/fmtlib/fmt.git
synced 2025-11-04 08:01:40 +01:00
82 lines
2.3 KiB
CMake
82 lines
2.3 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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# Can be removed once gcc 4.4 support is dropped.
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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 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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# Check if <variant> is available
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set(CMAKE_REQUIRED_FLAGS -std=c++1z)
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check_cxx_source_compiles("
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#include <variant>
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int main() {}"
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FMT_HAS_VARIANT)
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if (NOT FMT_HAS_VARIANT)
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set (FMT_HAS_VARIANT OFF)
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endif ()
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set(CMAKE_REQUIRED_FLAGS )
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