Index: lib/LTO/LTOCodeGenerator.cpp
===================================================================
--- lib/LTO/LTOCodeGenerator.cpp
+++ lib/LTO/LTOCodeGenerator.cpp
@@ -545,8 +545,10 @@
   formatted_raw_ostream Out(out);
 
   // If the bitcode files contain ARC code and were compiled with optimization,
-  // the ObjCARCContractPass must be run, so do it unconditionally here.
-  codeGenPasses.add(createObjCARCContractPass());
+  // the ObjCARCContractPass must be run, check the module flag to see if there
+  // is any file requires ARC
+  if (mergeModule->getModuleFlag("Objective-C ARC"))
+    codeGenPasses.add(createObjCARCContractPass());
 
   if (TargetMach->addPassesToEmitFile(codeGenPasses, Out,
                                       TargetMachine::CGFT_ObjectFile)) {