Avoid duplicate unavailbility diagnostics in objc++.

// rdar://10268422

llvm-svn: 142078

clang/lib/Sema/SemaExprObjC.cpp

@@ -1078,7 +1078,9 @@ ExprResult Sema::BuildClassMessage(TypeSourceInfo *ReceiverTypeInfo,
     return ExprError();
   }
   assert(Class && "We don't know which class we're messaging?");
-  (void)DiagnoseUseOfDecl(Class, Loc);
+  // objc++ diagnoses during typename annotation.
+  if (!getLangOptions().CPlusPlus)
+    (void)DiagnoseUseOfDecl(Class, Loc);
   // Find the method we are messaging.
   if (!Method) {
     if (Class->isForwardDecl()) {

clang/test/SemaObjC/special-dep-unavail-warning.m

@@ -43,3 +43,13 @@ void test(C *c) {
 
 }
 
+// rdar://10268422
+__attribute ((deprecated))
+@interface DEPRECATED
++(id)new;
+@end
+
+void foo() {
+  [DEPRECATED new]; // expected-warning {{warning: 'DEPRECATED' is deprecated}}
+}
+