Index: cfe/trunk/lib/Driver/ToolChains/CommonArgs.cpp
===================================================================
--- cfe/trunk/lib/Driver/ToolChains/CommonArgs.cpp
+++ cfe/trunk/lib/Driver/ToolChains/CommonArgs.cpp
@@ -525,6 +525,8 @@
   case Driver::OMPRT_IOMP5:
     CmdArgs.push_back("-liomp5");
     break;
+  case Driver::OMPRT_Unknown:
+    break;
   }
 
   if (ForceStaticHostRuntime)