Fixed Clang build

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

diff --git a/cds/compiler/clang/defs.h b/cds/compiler/clang/defs.h
index 7d271354c86a0cc94f0e4a641878ac742fca2682..8d7010510535f394fb0ee5dc0944cec94ad03086 100644 (file)
--- a/cds/compiler/clang/defs.h
+++ b/cds/compiler/clang/defs.h
@@ -25,7 +25,7 @@
     SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
     CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-    OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.     
+    OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
 #ifndef CDSLIB_COMPILER_CLANG_DEFS_H
@@ -127,6 +127,19 @@
 #define cds_likely( expr )   __builtin_expect( !!( expr ), 1 )
 #define cds_unlikely( expr ) __builtin_expect( !!( expr ), 0 )
 
+// double-width CAS support - only for libc++
+#ifdef _LIBCPP_VERSION
+#   if CDS_BUILD_BITS == 64
+#       ifdef __GCC_HAVE_SYNC_COMPARE_AND_SWAP_16
+#           define CDS_DCAS_SUPPORT
+#       endif
+#   else
+#       ifdef __GCC_HAVE_SYNC_COMPARE_AND_SWAP_8
+#           define CDS_DCAS_SUPPORT
+#       endif
+#   endif
+#endif
+
 #include <cds/compiler/gcc/compiler_barriers.h>
 
 #endif // #ifndef CDSLIB_COMPILER_GCC_DEFS_H