From f0bb7ea04c1c860c96dcfdd0a837d9c3eb906100 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Diego=20=27Flameeyes=27=20Petten=C3=B2?=
 <flameeyes@gmail.com>
Date: Tue, 10 Apr 2007 13:13:59 +0200
Subject: Add a new check for __attribute__((packed)), and if present, define
 XINE_PACKED.

This is the first step to sanitise the handling of PACKED attribute.
---
 m4/attributes.m4 | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

(limited to 'm4')

diff --git a/m4/attributes.m4 b/m4/attributes.m4
index 55f34c9f7..c46715d0e 100644
--- a/m4/attributes.m4
+++ b/m4/attributes.m4
@@ -322,3 +322,23 @@ AC_DEFUN([CC_ATTRIBUTE_ALIGNED], [
        [Define the highest alignment supported])
   fi
 ])
+
+AC_DEFUN([CC_ATTRIBUTE_PACKED], [
+  AC_REQUIRE([CC_CHECK_WERROR])
+  AC_CACHE_CHECK([if $CC supports __attribute__((packed))],
+    [cc_cv_attribute_packed],
+    [ac_save_CFLAGS="$CFLAGS"
+     CFLAGS="$CFLAGS $cc_cv_werror"
+     AC_COMPILE_IFELSE([struct { char a; short b; int c; } __attribute__((packed)) foo;],
+       [cc_cv_attribute_packed=yes],
+       [cc_cv_attribute_packed=no])
+     CFLAGS="$ac_save_CFLAGS"
+    ])
+
+  if test x$cc_cv_attribute_packed = xyes; then
+    AC_DEFINE([SUPPORT_ATTRIBUTE_PACKED], 1, [Define this if the compiler supports __attribute__((packed))])
+    ifelse([$1], , [:], [$1])
+  else
+    ifelse([$2], , [:], [$2])
+  fi
+])
-- 
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