diff --git a/clang/lib/CodeGen/CGObjCMac.cpp b/clang/lib/CodeGen/CGObjCMac.cpp
index 37b9b40..12880fe 100644
--- a/clang/lib/CodeGen/CGObjCMac.cpp
+++ b/clang/lib/CodeGen/CGObjCMac.cpp
@@ -4941,6 +4941,8 @@
     llvm::report_fatal_error(
         "Objective-C support is unimplemented for object file format.");
   }
+
+  llvm_unreachable("Unhandled llvm::Triple::ObjectFormatType enum");
 }
 
 /// EmitImageInfo - Emit the image info marker used to encode some module