dnl @synopsis XIPH_ADD_CFLAGS
dnl
dnl Add the given option to CFLAGS, if it doesn't break the compiler

AC_DEFUN([XIPH_ADD_CFLAGS],
[AC_MSG_CHECKING([if $CC accepts $1])
	ac_add_cflags__old_cflags="$CFLAGS"
	CFLAGS="$1"
	AC_LINK_IFELSE([AC_LANG_PROGRAM([[
			#include <stdio.h>
			]], [[puts("Hello, World!"); return 0;]])],[AC_MSG_RESULT(yes)
			CFLAGS="$ac_add_cflags__old_cflags $1"],[AC_MSG_RESULT(no)
			CFLAGS="$ac_add_cflags__old_cflags"
		])
])# XIPH_ADD_CFLAGS
