From 35bde472b5455bab19157922dab06a5c2864bced Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Diego=20=27Flameeyes=27=20Petten=C3=B2?=
 <flameeyes@gmail.com>
Date: Tue, 20 May 2008 21:14:36 +0200
Subject: Add check for const attribute (for mathematical functions).

Add CC_ATTRIBUTE_CONST macro to the attributes.h.
Run CC_ATTRIBUTE_CONST in configure.
Define SUPPORT_ATTRIBUTE_CONST for GCC 3.
Define XINE_CONST to __attribute__((__const__)) if supported.

--HG--
extra : transplant_source : /26%26%DF%C0%3C%AC%27%5C%B7%B1y%FEQ%8Ay%EE%F1%BD
---
 m4/attributes.m4 | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'm4')

diff --git a/m4/attributes.m4 b/m4/attributes.m4
index fa379a2fe..f71b3d0d0 100644
--- a/m4/attributes.m4
+++ b/m4/attributes.m4
@@ -188,6 +188,14 @@ AC_DEFUN([CC_ATTRIBUTE_PACKED], [
     [$2])
 ])
 
+AC_DEFUN([CC_ATTRIBUTE_CONST], [
+  CC_CHECK_ATTRIBUTE(
+    [const], ,
+    [int __attribute__((const)) twopow(int n) { return 1 << n; } ],
+    [$1],
+    [$2])
+])
+
 AC_DEFUN([CC_FLAG_VISIBILITY], [
   AC_REQUIRE([CC_CHECK_WERROR])
   AC_CACHE_CHECK([if $CC supports -fvisibility=hidden],
-- 
cgit v1.2.3