// 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