Index: llvm/trunk/lib/LTO/LTOCodeGenerator.cpp
===================================================================
--- llvm/trunk/lib/LTO/LTOCodeGenerator.cpp
+++ llvm/trunk/lib/LTO/LTOCodeGenerator.cpp
@@ -257,6 +257,8 @@
   bool genResult = compileOptimized(&objFile.os());
   objFile.os().close();
   if (objFile.os().has_error()) {
+    Twine ErrMsg = "could not write object file: " + Filename.str();
+    emitError(ErrMsg.str());
     objFile.os().clear_error();
     sys::fs::remove(Twine(Filename));
     return false;