From dfc9430bc7536c9f4599d586afce43606337dedb Mon Sep 17 00:00:00 2001
From: Douglas Gregor <dgregor@apple.com>
Date: Tue, 18 Dec 2012 23:02:07 +0000
Subject: [PATCH] Be defensive when printing module import locations; the
 diagnostic printer needs to be robust

llvm-svn: 170466
---
 clang/lib/Frontend/TextDiagnostic.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/clang/lib/Frontend/TextDiagnostic.cpp b/clang/lib/Frontend/TextDiagnostic.cpp
index 651ddd6..aba90f6 100644
--- a/clang/lib/Frontend/TextDiagnostic.cpp
+++ b/clang/lib/Frontend/TextDiagnostic.cpp
@@ -898,7 +898,7 @@ void TextDiagnostic::emitBuildingModuleLocation(SourceLocation Loc,
                                                 PresumedLoc PLoc,
                                                 StringRef ModuleName,
                                                 const SourceManager &SM) {
-  if (DiagOpts->ShowLocation)
+  if (DiagOpts->ShowLocation && PLoc.getFilename())
     OS << "While building module '" << ModuleName << "' imported from "
       << PLoc.getFilename() << ':' << PLoc.getLine() << ":\n";
   else
-- 
2.7.4