From: khizmax <khizmax@gmail.com>
Date: Wed, 16 Nov 2016 07:20:31 +0000 (+0300)
Subject: Fixed: gcc-4.9 does not support DCAS for atomic (a lot of crashes in TaggedFreeList)
X-Git-Tag: v2.2.0~54
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=c3f6356cdc15470aa8a3603afd22cc3e213aada9;p=libcds.git

Fixed: gcc-4.9 does not support DCAS for atomic (a lot of crashes in TaggedFreeList)
---

diff --git a/cds/compiler/gcc/defs.h b/cds/compiler/gcc/defs.h
index 5c4fb8a3..055fd10d 100644
--- a/cds/compiler/gcc/defs.h
+++ b/cds/compiler/gcc/defs.h
@@ -104,7 +104,8 @@
 
 // double-width CAS support
 // note: gcc-4.8 does not support double-word atomics
-#if CDS_COMPILER_VERSION >= 40900
+//       gcc-4.9: a lot of crashes when use DCAS
+#if CDS_COMPILER_VERSION >= 50000
 #   if CDS_BUILD_BITS == 64
 #       ifdef __GCC_HAVE_SYNC_COMPARE_AND_SWAP_16
 #           define CDS_DCAS_SUPPORT