From 07bc4d0ab7cdaa1ce73a32437bc6bc6e41c57dcb Mon Sep 17 00:00:00 2001
From: Ivan Maidanski <ivmai@mail.ru>
Date: Wed, 7 Mar 2012 07:41:23 +0400
Subject: Fix AO_stack_push_release to workaround bug in clang-1.1/x86

* src/atomic_ops_stack.c (AO_stack_push_release): Make "cptr" local
variable volatile to workaround a bug in clang-1.1/x86 compiler; add
comment.
---
 src/atomic_ops_stack.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/atomic_ops_stack.c b/src/atomic_ops_stack.c
index 2f03145..dd29848 100644
--- a/src/atomic_ops_stack.c
+++ b/src/atomic_ops_stack.c
@@ -242,7 +242,13 @@ void AO_stack_push_release(AO_stack_t *list, AO_t *element)
 
 AO_t *AO_stack_pop_acquire(AO_stack_t *list)
 {
-    AO_t *cptr;
+#   ifdef __clang__
+      AO_t *volatile cptr;
+                        /* Use volatile to workaround a bug in          */
+                        /* clang-1.1/x86 causing test_stack failure.    */
+#   else
+      AO_t *cptr;
+#   endif
     AO_t next;
     AO_t cversion;
 
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