Fixes a regression in generating objc's GC API

in assiging to c pointer types with a GC'able
attribute.

llvm-svn: 81244

clang/include/clang/AST/Type.h

@@ -2235,6 +2235,9 @@ inline QualType::GCAttrTypes QualType::getObjCGCAttr() const {
     return EXTQT->getObjCGCAttr();
   if (const ObjCObjectPointerType *PT = CT->getAsObjCObjectPointerType())
     return PT->getPointeeType().getObjCGCAttr(); 
+  // We most look at all pointer types, not just pointer to interface types.
+  if (const PointerType *PT = CT->getAs<PointerType>())
+    return PT->getPointeeType().getObjCGCAttr(); 
   return GCNone;
 }
 

clang/test/CodeGenObjC/objc2-strong-cast-4.m

@@ -0,0 +1,23 @@
+// RUN: clang-cc -triple x86_64-apple-darwin10 -fobjc-gc -emit-llvm -o %t %s &&
+// RUN: grep objc_assign_strongCast %t | count 3 &&
+// RUN: true
+
+struct Slice {
+    void *__strong * items;
+};
+
+typedef struct Slice Slice;
+
+@interface ISlice {
+@public
+    void *__strong * items;
+}
+@end
+
+void foo () {
+    Slice *slice;
+    slice->items = 0;
+
+    ISlice *islice;
+    islice->items = 0;
+}