Index: llvm/trunk/test/tools/llvm-mc/basic.test
===================================================================
--- llvm/trunk/test/tools/llvm-mc/basic.test
+++ llvm/trunk/test/tools/llvm-mc/basic.test
@@ -0,0 +1,2 @@
+# RUN: not llvm-mc %t.blah -o %t2 2>&1 | FileCheck --check-prefix=ENOENT %s
+# ENOENT: {{.*}}.blah: {{[Nn]}}o such file or directory
Index: llvm/trunk/tools/llvm-mc/llvm-mc.cpp
===================================================================
--- llvm/trunk/tools/llvm-mc/llvm-mc.cpp
+++ llvm/trunk/tools/llvm-mc/llvm-mc.cpp
@@ -395,15 +395,10 @@
   // construct the Triple object.
   Triple TheTriple(TripleName);
 
-  if (InputFilename != "-" && !sys::fs::exists(InputFilename)) {
-    errs() << ProgName << ": '" << InputFilename << "': "
-           << "No such file\n";
-    return 1;
-  }
   ErrorOr<std::unique_ptr<MemoryBuffer>> BufferPtr =
       MemoryBuffer::getFileOrSTDIN(InputFilename);
   if (std::error_code EC = BufferPtr.getError()) {
-    errs() << ProgName << ": " << EC.message() << '\n';
+    errs() << InputFilename << ": " << EC.message() << '\n';
     return 1;
   }
   MemoryBuffer *Buffer = BufferPtr->get();