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55 lines
1.5 KiB
CMake
55 lines
1.5 KiB
CMake
# C++14 feature support detection
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include(CheckCXXCompilerFlag)
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function (fmt_check_cxx_compiler_flag flag result)
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if (NOT MSVC)
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check_cxx_compiler_flag("${flag}" ${result})
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endif ()
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endfunction ()
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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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fmt_check_cxx_compiler_flag(-std=c++20 has_std_20_flag)
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fmt_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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fmt_check_cxx_compiler_flag(-std=c++17 has_std_17_flag)
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fmt_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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fmt_check_cxx_compiler_flag(-std=c++14 has_std_14_flag)
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fmt_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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fmt_check_cxx_compiler_flag(-std=c++11 has_std_11_flag)
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fmt_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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