add missing files from m4 directory

svn path=/trunk/vorbis/; revision=14209

diff --git a/m4/Makefile.am b/m4/Makefile.am
new file mode 100644 (file)
index 0000000..89336d1
--- /dev/null
+++ b/m4/Makefile.am
@@ -0,0 +1,4 @@
+## Process this file with automake to produce Makefile.in
+
+EXTRA_DIST = add_cflags.m4
+

diff --git a/m4/add_cflags.m4 b/m4/add_cflags.m4
new file mode 100644 (file)
index 0000000..eeb6efd
--- /dev/null
+++ b/m4/add_cflags.m4
@@ -0,0 +1,15 @@
+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