From: Douglas Gregor <dgregor@apple.com>
Date: Tue, 12 Apr 2011 01:02:45 +0000 (+0000)
Subject: Objective-C++: The global namespace is an associated namespace of an
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=f25760e17af1167c6fcf24e1ea8e3fcbd0386702;p=clang

Objective-C++: The global namespace is an associated namespace of an
Objective-C pointer type. Fixes <rdar://problem/9142559>.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@129339 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Sema/SemaLookup.cpp b/lib/Sema/SemaLookup.cpp
index 3315ab6e53..2fd799ba41 100644
--- a/lib/Sema/SemaLookup.cpp
+++ b/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;
     }
 
diff --git a/test/SemaObjCXX/argument-dependent-lookup.mm b/test/SemaObjCXX/argument-dependent-lookup.mm
new file mode 100644
index 0000000000..a25cc68888
--- /dev/null
+++ b/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);
+}