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