Index: projects/compiler-rt/lib/sanitizer_common/sanitizer_mac.h
===================================================================
--- projects/compiler-rt/lib/sanitizer_common/sanitizer_mac.h
+++ projects/compiler-rt/lib/sanitizer_common/sanitizer_mac.h
@@ -25,7 +25,8 @@
   MACOS_VERSION_SNOW_LEOPARD,
   MACOS_VERSION_LION,
   MACOS_VERSION_MOUNTAIN_LION,
-  MACOS_VERSION_MAVERICKS
+  MACOS_VERSION_MAVERICKS,
+  MACOS_VERSION_YOSEMITE,
 };
 
 MacosVersion GetMacosVersion();
Index: projects/compiler-rt/lib/sanitizer_common/sanitizer_mac.cc
===================================================================
--- projects/compiler-rt/lib/sanitizer_common/sanitizer_mac.cc
+++ projects/compiler-rt/lib/sanitizer_common/sanitizer_mac.cc
@@ -297,6 +297,7 @@
         case '1': return MACOS_VERSION_LION;
         case '2': return MACOS_VERSION_MOUNTAIN_LION;
         case '3': return MACOS_VERSION_MAVERICKS;
+        case '4': return MACOS_VERSION_YOSEMITE;
         default: return MACOS_VERSION_UNKNOWN;
       }
     }