gcc-4.8 does not supported std::atomic for 128-bit types

[libcds.git] / cds / compiler / gcc / defs.h

diff --git a/cds/compiler/gcc/defs.h b/cds/compiler/gcc/defs.h
index e2c3b7640def756af1430da78358e57145bc94fa..99d8589c17d33f9c54e24f43196527ccf5e54efa 100644 (file)
--- a/cds/compiler/gcc/defs.h
+++ b/cds/compiler/gcc/defs.h
@@ -104,7 +104,8 @@
 
 // double-width CAS support
 #if CDS_BUILD_BITS == 64
-#   ifdef __GCC_HAVE_SYNC_COMPARE_AND_SWAP_16
+    // gcc-4.8 does not support 16-word (128bit) atomics
+#   if defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_16 ) && CDS_COMPILER_VERSION >= 40900
 #       define CDS_DCAS_SUPPORT
 #   endif
 #else