From 75515af53754cb152d7fa9c63547f788946ec37b Mon Sep 17 00:00:00 2001
From: David Adam <zanchey@ucc.gu.uwa.edu.au>
Date: Wed, 29 Jul 2015 21:13:38 +0800
Subject: configure: only define special attributes if not defined

Fixes a build warning on FreeBSD, where <sys/cdefs.h> defines __packed and
friends.
---
 configure.ac | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'configure.ac')

diff --git a/configure.ac b/configure.ac
index 77a9e5f3..52bc00f1 100644
--- a/configure.ac
+++ b/configure.ac
@@ -107,9 +107,15 @@ AC_CONFIG_HEADERS(config.h)
 #
 
 AH_BOTTOM([#if __GNUC__ >= 3
+#ifndef __warn_unused
 #define __warn_unused __attribute__ ((warn_unused_result))
+#endif
+#ifndef __sentinel
 #define __sentinel __attribute__ ((sentinel))
+#endif
+#ifndef __packed
 #define __packed __attribute__ ((packed))
+#endif
 #else
 #define __warn_unused
 #define __sentinel
-- 
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