check_linker_flag.cmake

include(CheckCXXSourceCompiles)

FUNCTION(MY_CHECK_AND_SET_LINKER_FLAG flag_to_set)
  # Let's avoid expensive compiler tests on Windows:
  IF(WIN32)
    RETURN()
  ENDIF()
  STRING(REGEX REPLACE "[-,= +]" "_" result "HAVE_LINK_FLAG_${flag_to_set}")
  SET(SAVE_CMAKE_REQUIRED_LIBRARIES "${CMAKE_REQUIRED_LIBRARIES}")
  STRING(REGEX REPLACE "^-Wno-" "-W" flag_to_check ${flag_to_set})
  SET(CMAKE_REQUIRED_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES} ${flag_to_check})
  CHECK_CXX_SOURCE_COMPILES("int main(void) { return 0; }" ${result})
  SET(CMAKE_REQUIRED_LIBRARIES "${SAVE_CMAKE_REQUIRED_LIBRARIES}")
  IF (${result})
    FOREACH(linktype SHARED MODULE EXE)
        IF(ARGN)
          FOREACH(type ${ARGN})
            SET(CMAKE_${linktype}_LINKER_FLAGS_${type}
              "${CMAKE_${linktype}_LINKER_FLAGS_${type}} ${flag_to_set}" PARENT_SCOPE)
          ENDFOREACH()
        ELSE()
          SET(CMAKE_${linktype}_LINKER_FLAGS
            "${CMAKE_${linktype}_LINKER_FLAGS} ${flag_to_set}" PARENT_SCOPE)
        ENDIF()
    ENDFOREACH()
  ENDIF()
ENDFUNCTION()