Index: llvm/trunk/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
===================================================================
--- llvm/trunk/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
+++ llvm/trunk/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
@@ -87,6 +87,7 @@
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/Format.h"
 #include "llvm/Support/MathExtras.h"
+#include "llvm/Support/Path.h"
 #include "llvm/Support/TargetRegistry.h"
 #include "llvm/Support/Timer.h"
 #include "llvm/Support/raw_ostream.h"
@@ -272,7 +273,8 @@
   // don't, this at least helps the user find where a global came from.
   if (MAI->hasSingleParameterDotFile()) {
     // .file "foo.c"
-    OutStreamer->EmitFileDirective(M.getSourceFileName());
+    OutStreamer->EmitFileDirective(
+        llvm::sys::path::filename(M.getSourceFileName()));
   }
 
   GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
Index: llvm/trunk/test/CodeGen/X86/file-directive.ll
===================================================================
--- llvm/trunk/test/CodeGen/X86/file-directive.ll
+++ llvm/trunk/test/CodeGen/X86/file-directive.ll
@@ -0,0 +1,13 @@
+; RUN: llc -mtriple=x86_64-linux-gnu -filetype=asm < %s | FileCheck %s --check-prefix=DIRECTIVE
+; RUN: llc -mtriple=x86_64-linux-gnu -filetype=obj < %s | llvm-readobj -symbols | FileCheck %s --check-prefix=STT-FILE
+
+; DIRECTIVE: .file "foobar"
+; STT-FILE: Name: foobar
+; STT-FILE-NEXT: Value: 0x0
+; STT-FILE-NEXT: Size: 0
+; STT-FILE-NEXT: Binding: Local
+; STT-FILE-NEXT: Type: File
+; STT-FILE-NEXT: Other: 0
+; STT-FILE-NEXT: Section: Absolute
+
+source_filename = "/path/to/foobar"