Index: cfe/trunk/lib/Driver/XRayArgs.cpp
===================================================================
--- cfe/trunk/lib/Driver/XRayArgs.cpp
+++ cfe/trunk/lib/Driver/XRayArgs.cpp
@@ -52,7 +52,7 @@
     } else if (Triple.isOSFreeBSD() ||
                Triple.isOSOpenBSD() ||
                Triple.isOSNetBSD() ||
-               Triple.getOS() == llvm::Triple::Darwin) {
+               Triple.isMacOSX()) {
       if (Triple.getArch() != llvm::Triple::x86_64) {
         D.Diag(diag::err_drv_clang_unsupported)
             << (std::string(XRayInstrumentOption) + " on " + Triple.str());
Index: cfe/trunk/test/Driver/XRay/xray-instrument-macos.c
===================================================================
--- cfe/trunk/test/Driver/XRay/xray-instrument-macos.c
+++ cfe/trunk/test/Driver/XRay/xray-instrument-macos.c
@@ -0,0 +1,4 @@
+// RUN: %clang -o /dev/null -v -fxray-instrument -target x86_64-apple-macos10.11 -c %s
+// RUN: %clang -o /dev/null -v -fxray-instrument -target x86_64-apple-darwin15 -c %s
+// REQUIRES-ANY: x86_64, x86_64h
+typedef int a;