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include(CheckCCompilerFlag)
function(test_and_set_c_compiler_flag_global _flag)
string(REGEX REPLACE "-" "_" _sflag ${_flag})
string(REGEX REPLACE "=" "_" _sflag ${_sflag})
# Use -Werror during test so clang rejects unknown flags
set(CMAKE_REQUIRED_FLAGS "-Werror ${_flag}")
check_c_compiler_flag(${_flag} COMPILER_SUPPORTS_FLAG_${_sflag})
if(COMPILER_SUPPORTS_FLAG_${_sflag})
add_compile_options(${_flag})
endif()
endfunction()
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