m4/pipeline-gcc-warning.m4

   1 # pipeline-gcc-warning.m4 serial 1
   2 dnl PIPELINE_GCC_WARNING(WARNING)
   3 dnl Add -WWARNING to CFLAGS if it is supported by the compiler.
   4 AC_DEFUN([PIPELINE_GCC_WARNING],
   5 [pipeline_saved_CFLAGS="$CFLAGS"
   6  CFLAGS="$CFLAGS -W$1"
   7  AC_CACHE_CHECK([that GCC supports -W$1],
   8    [AS_TR_SH([pipeline_cv_gcc_warning_$1])],
   9    [AS_TR_SH([pipeline_cv_gcc_warning_$1])=no
  10     AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
  11                       [AS_TR_SH([pipeline_cv_gcc_warning_$1])=yes])])
  12  if test "$AS_TR_SH([pipeline_cv_gcc_warning_$1])" = no; then
  13    CFLAGS="$pipeline_saved_CFLAGS"
  14  fi]) # PIPELINE_GCC_WARNING