m4/add_cflags.m4

   1 dnl @synopsis XIPH_ADD_CFLAGS
   2 dnl
   3 dnl Add the given option to CFLAGS, if it doesn't break the compiler
   4
   5 AC_DEFUN([XIPH_ADD_CFLAGS],
   6 [AC_MSG_CHECKING([if $CC accepts $1])
   7         ac_add_cflags__old_cflags="$CFLAGS"
   8         CFLAGS="$1"
   9         AC_TRY_LINK([
  10                         #include <stdio.h>
  11                         ],
  12                 [puts("Hello, World!"); return 0;],
  13                 AC_MSG_RESULT([yes])
  14                         CFLAGS="$ac_add_cflags__old_cflags $1",
  15                 AC_MSG_RESULT([no])
  16                         CFLAGS="$ac_add_cflags__old_cflags"
  17                 )
  18 ])# XIPH_ADD_CFLAGS