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include(Compiler/Clang)
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__compiler_clang(C)
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cmake_policy(GET CMP0025 appleClangPolicy)
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if(WIN32 OR (APPLE AND NOT appleClangPolicy STREQUAL NEW))
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return()
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endif()
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if(NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 3.4)
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set(CMAKE_C90_STANDARD_COMPILE_OPTION "-std=c90")
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set(CMAKE_C90_EXTENSION_COMPILE_OPTION "-std=gnu90")
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set(CMAKE_C99_STANDARD_COMPILE_OPTION "-std=c99")
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set(CMAKE_C99_EXTENSION_COMPILE_OPTION "-std=gnu99")
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set(CMAKE_C11_STANDARD_COMPILE_OPTION "-std=c11")
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set(CMAKE_C11_EXTENSION_COMPILE_OPTION "-std=gnu11")
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endif()
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if(NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 3.6)
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set(CMAKE_C_STANDARD_DEFAULT 11)
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elseif(NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 3.4)
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set(CMAKE_C_STANDARD_DEFAULT 99)
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endif()
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macro(cmake_record_c_compile_features)
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macro(_get_clang_features std_version list)
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record_compiler_features(C "${std_version}" ${list})
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endmacro()
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set(_result 0)
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if (UNIX AND NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 3.4)
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_get_clang_features(${CMAKE_C11_STANDARD_COMPILE_OPTION} CMAKE_C11_COMPILE_FEATURES)
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if (_result EQUAL 0)
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_get_clang_features(${CMAKE_C99_STANDARD_COMPILE_OPTION} CMAKE_C99_COMPILE_FEATURES)
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endif()
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if (_result EQUAL 0)
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_get_clang_features(${CMAKE_C90_STANDARD_COMPILE_OPTION} CMAKE_C90_COMPILE_FEATURES)
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endif()
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endif()
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endmacro()
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