From 90bb53f8c9b7ca3db6841a5005af791b93782d96 Mon Sep 17 00:00:00 2001
From: Darren Salt <linux@youmustbejoking.demon.co.uk>
Date: Sat, 3 May 2008 14:34:45 +0100
Subject: Add support for "deprecated" attribute.

---
 m4/attributes.m4 | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

(limited to 'm4')

diff --git a/m4/attributes.m4 b/m4/attributes.m4
index 55f34c9f7..a74280696 100644
--- a/m4/attributes.m4
+++ b/m4/attributes.m4
@@ -322,3 +322,26 @@ AC_DEFUN([CC_ATTRIBUTE_ALIGNED], [
        [Define the highest alignment supported])
   fi
 ])
+
+AC_DEFUN([CC_ATTRIBUTE_DEPRECATED], [
+	AC_REQUIRE([CC_CHECK_WERROR])
+	ac_save_CFLAGS="$CFLAGS"
+	CFLAGS="$CFLAGS $cc_cv_werror"
+	AC_CACHE_CHECK([if compiler supports __attribute__((deprecated))],
+		[cc_cv_attribute_alias],
+		[AC_COMPILE_IFELSE([
+			void some_function(void) __attribute__((deprecated));
+			],
+			[cc_cv_attribute_deprecated=yes],
+			[cc_cv_attribute_deprecated=no])
+		])
+	CFLAGS="$ac_save_CFLAGS"
+	
+	if test "x$cc_cv_attribute_deprecated" = "xyes"; then
+		AC_DEFINE([SUPPORT_ATTRIBUTE_DEPRECATED], 1, [Define this if the compiler supports the deprecated attribute])
+		$1
+	else
+		true
+		$2
+	fi
+])
-- 
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