Objective-C++: The global namespace is an associated namespace of an

Objective-C pointer type. Fixes <rdar://problem/9142559>.

llvm-svn: 129339

clang/lib/Sema/SemaLookup.cpp

@@ -1963,10 +1963,13 @@ addAssociatedClassesAndNamespaces(AssociatedLookup &Result, QualType Ty) {
     case Type::Complex:
       break;
 
-    // These are ignored by ADL.
+    // If T is an Objective-C object or interface type, or a pointer to an 
+    // object or interface type, the associated namespace is the global
+    // namespace.
     case Type::ObjCObject:
     case Type::ObjCInterface:
     case Type::ObjCObjectPointer:
+      Result.Namespaces.insert(Result.S.Context.getTranslationUnitDecl());
       break;
     }
 

clang/test/SemaObjCXX/argument-dependent-lookup.mm

@@ -0,0 +1,19 @@
+// RUN: %clang_cc1 -fsyntax-only -verify %s
+
+// <rdar://problem/9142559>: For the purposes of Argument-Dependent
+// Lookup, Objective-C classes are considered to be in the global
+// namespace.
+
+@interface NSFoo
+@end
+
+template<typename T>
+void f(T t) {
+  g(t);
+}
+
+void g(NSFoo*);
+
+void test(NSFoo *foo) {
+  f(foo);
+}