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# - Adds a compiler flag if it is supported by the compiler
#
# This function checks that the supplied compiler flag is supported and then
# adds it to the corresponding compiler flags
#
# add_c_compiler_flag(<FLAG> [<VARIANT>])
#
# - Example
#
# include(AddCCompilerFlag)
# add_c_compiler_flag(-Wall)
# add_c_compiler_flag(-no-strict-aliasing RELEASE)
# Requires CMake 2.6+
if(__add_c_compiler_flag)
return()
endif()
set(__add_c_compiler_flag INCLUDED)
include(CheckCCompilerFlag)
function(add_c_compiler_flag FLAG)
string(TOUPPER "HAVE_C_FLAG_${FLAG}" SANITIZED_FLAG)
string(REPLACE "+" "X" SANITIZED_FLAG ${SANITIZED_FLAG})
string(REGEX REPLACE "[^A-Za-z_0-9]" "_" SANITIZED_FLAG ${SANITIZED_FLAG})
string(REGEX REPLACE "_+" "_" SANITIZED_FLAG ${SANITIZED_FLAG})
set(CMAKE_REQUIRED_FLAGS "${FLAG}")
check_c_compiler_flag("" ${SANITIZED_FLAG})
if(${SANITIZED_FLAG})
set(VARIANT ${ARGV1})
if(ARGV1)
string(REGEX REPLACE "[^A-Za-z_0-9]" "_" VARIANT "${VARIANT}")
string(TOUPPER "_${VARIANT}" VARIANT)
endif()
set(CMAKE_C_FLAGS${VARIANT} "${CMAKE_C_FLAGS${VARIANT}} ${FLAG}" PARENT_SCOPE)
endif()
endfunction()
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