From 8ccbc18efa244023edd07661f4b23c9d42a20819 Mon Sep 17 00:00:00 2001
From: Douglas Gregor <dgregor@apple.com>
Date: Tue, 9 Apr 2013 01:49:26 +0000
Subject: [PATCH] Skip transparent contexts when looking for using directives
 in name lookup.

Fixes the bootstrap regression I introduced in r179067.

llvm-svn: 179079
---
 clang/lib/Sema/SemaLookup.cpp                        |  6 +++++-
 .../basic/basic.lookup/basic.lookup.unqual/p14.cpp   | 12 ++++++++----
 2 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/clang/lib/Sema/SemaLookup.cpp b/clang/lib/Sema/SemaLookup.cpp
index ebe28944062c..b631d8b930a7 100644
--- a/clang/lib/Sema/SemaLookup.cpp
+++ b/clang/lib/Sema/SemaLookup.cpp
@@ -962,8 +962,12 @@ bool Sema::CppLookupName(LookupResult &R, Scope *S) {
           // If we haven't handled using directives yet, do so now.
           if (!VisitedUsingDirectives) {
             // Add using directives from this context up to the top level.
-            for (DeclContext *UCtx = Ctx; UCtx; UCtx = UCtx->getParent())
+            for (DeclContext *UCtx = Ctx; UCtx; UCtx = UCtx->getParent()) {
+              if (UCtx->isTransparentContext())
+                continue;
+
               UDirs.visit(UCtx, UCtx);
+            }
 
             // Find the innermost file scope, so we can add using directives
             // from local scopes.
diff --git a/clang/test/CXX/basic/basic.lookup/basic.lookup.unqual/p14.cpp b/clang/test/CXX/basic/basic.lookup/basic.lookup.unqual/p14.cpp
index 272ad8568c9e..6fba97298981 100644
--- a/clang/test/CXX/basic/basic.lookup/basic.lookup.unqual/p14.cpp
+++ b/clang/test/CXX/basic/basic.lookup/basic.lookup.unqual/p14.cpp
@@ -56,10 +56,14 @@ namespace Other {
 namespace M2 {
   using namespace Other;
 
-  namespace MInner {
-    class Bar { 
-      void bar();
-    };
+  extern "C" {
+    namespace MInner {
+      extern "C" {
+        class Bar { 
+          void bar();
+        };
+      }
+    }
   }
 }