m4/add_cflags.m4

   1 dnl @synopsis AC_ADD_CFLAGS
   2 dnl
   3 dnl Add the given option to CFLAGS, if it doesn't break the compiler
   4
   5 AC_DEFUN([AC_ADD_CFLAGS],
   6 [AC_MSG_CHECKING([if $CC accepts $1])
   7         ac_add_cflags__old_cflags="$CFLAGS"
   8         CFLAGS="$CFLAGS $1"
   9         AC_TRY_LINK([#include <stdio.h>],
  10                 [puts("Hello, World!"); return 0;],
  11                 AC_MSG_RESULT([yes]),
  12                 AC_MSG_RESULT([no])
  13                 CFLAGS="$ac_add_cflags__old_cflags")
  14                 ])
  15 ])# AC_ADD_CFLAGS