include(CheckCXXCompilerFlag)

macro(append_cxx_flags_if_supported VAR)
  foreach(FLAG ${ARGN})
    check_cxx_compiler_flag(${FLAG} HAS_FLAG${FLAG})
    if(${HAS_FLAG${FLAG}})
      list(APPEND ${VAR} ${FLAG})
    endif()
  endforeach()
endmacro()