From 61aae73f5427c987b20604fbec5772e02edc0f74 Mon Sep 17 00:00:00 2001
From: Jim Meyering <meyering@redhat.com>
Date: Mon, 5 Jul 2010 17:16:23 +0200
Subject: system.h: define ATTRIBUTE_WARN_UNUSED_RESULT

* src/system.h (ATTRIBUTE_WARN_UNUSED_RESULT): Define.
---
 src/system.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/system.h b/src/system.h
index 859b663b9..9e1468172 100644
--- a/src/system.h
+++ b/src/system.h
@@ -483,6 +483,14 @@ enum
 # define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
 #endif
 
+/* The warn_unused_result attribute appeared first in gcc-3.4.0 */
+#undef ATTRIBUTE_WARN_UNUSED_RESULT
+#if __GNUC__ < 3 || (__GNUC__ == 3 && __GNUC_MINOR__ < 4)
+# define ATTRIBUTE_WARN_UNUSED_RESULT /* empty */
+#else
+# define ATTRIBUTE_WARN_UNUSED_RESULT __attribute__ ((__warn_unused_result__))
+#endif
+
 #if defined strdupa
 # define ASSIGN_STRDUPA(DEST, S)		\
   do { DEST = strdupa (S); } while (0)
-- 
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