Index: llvm/trunk/lib/Support/Triple.cpp
===================================================================
--- llvm/trunk/lib/Support/Triple.cpp
+++ llvm/trunk/lib/Support/Triple.cpp
@@ -459,7 +459,7 @@
     .StartsWith("kfreebsd", Triple::KFreeBSD)
     .StartsWith("linux", Triple::Linux)
     .StartsWith("lv2", Triple::Lv2)
-    .StartsWith("macosx", Triple::MacOSX)
+    .StartsWith("macos", Triple::MacOSX)
     .StartsWith("netbsd", Triple::NetBSD)
     .StartsWith("openbsd", Triple::OpenBSD)
     .StartsWith("solaris", Triple::Solaris)
@@ -984,6 +984,8 @@
   StringRef OSTypeName = getOSTypeName(getOS());
   if (OSName.startswith(OSTypeName))
     OSName = OSName.substr(OSTypeName.size());
+  else if (getOS() == MacOSX)
+    OSName.consume_front("macos");
 
   parseVersionFromName(OSName, Major, Minor, Micro);
 }
Index: llvm/trunk/test/CodeGen/X86/version_directive.ll
===================================================================
--- llvm/trunk/test/CodeGen/X86/version_directive.ll
+++ llvm/trunk/test/CodeGen/X86/version_directive.ll
@@ -1,4 +1,5 @@
 ; RUN: llc -mtriple x86_64-apple-darwin15.0.0 -o - /dev/null | FileCheck %s
 ; RUN: llc -mtriple x86_64-apple-macosx10.11.0 -o - /dev/null | FileCheck %s
+; RUN: llc -mtriple x86_64-apple-macos10.11.0 -o - /dev/null | FileCheck %s
 
 ; CHECK: .macosx_version_min 10, 11