source: vbox/trunk/src/libs/libvorbis-1.3.7/m4/add_cflags.m4

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

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