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include(CheckCCompilerFlag)
macro(add_c_compiler_flag _COMPILER_FLAG _OUTPUT_VARIABLE)
string(TOUPPER ${_COMPILER_FLAG} _COMPILER_FLAG_NAME)
string(REGEX REPLACE "^-" "" _COMPILER_FLAG_NAME "${_COMPILER_FLAG_NAME}")
string(REGEX REPLACE "(-|=|\ )" "_" _COMPILER_FLAG_NAME "${_COMPILER_FLAG_NAME}")
check_c_compiler_flag("${_COMPILER_FLAG}" WITH_${_COMPILER_FLAG_NAME}_FLAG)
if (WITH_${_COMPILER_FLAG_NAME}_FLAG)
#string(APPEND ${_OUTPUT_VARIABLE} "${_COMPILER_FLAG} ")
list(APPEND ${_OUTPUT_VARIABLE} ${_COMPILER_FLAG})
endif()
endmacro()
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