include(Compiler/GNU) __compiler_gnu(C) if (NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 4.7) 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() # This may change in a future GNU version. set(CMAKE_C_STANDARD_DEFAULT 90) macro(cmake_record_c_compile_features) macro(_get_gcc_features std_version list) record_compiler_features(C "-std=${std_version}" ${list}) endmacro() if (UNIX AND NOT APPLE AND NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 4.7) _get_gcc_features(c11 CMAKE_C11_COMPILE_FEATURES) if (_result EQUAL 0) _get_gcc_features(c99 CMAKE_C99_COMPILE_FEATURES) endif() if (_result EQUAL 0) _get_gcc_features(c90 CMAKE_C90_COMPILE_FEATURES) endif() else() set(_result 0) endif() endmacro()