Clang really intends to reject attribute 'warn_unused_result' on Objective-C methods, but

instead it crashes on them.  We might extend this attribute to work on methods, but for
now fix the crasher.  Addresses <rdar://problem/7670939>.

llvm-svn: 96723

clang/lib/Sema/SemaDeclAttr.cpp

@@ -754,7 +754,7 @@ static void HandleWarnUnusedResult(Decl *D, const AttributeList &Attr, Sema &S)
     return;
   }
 
-  if (!isFunctionOrMethod(D)) {
+  if (!isFunction(D)) {
     S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
       << Attr.getName() << 0 /*function*/;
     return;

clang/test/SemaObjC/method-warn-unused-attribute.m

@@ -0,0 +1,8 @@
+// RUN: %clang_cc1  -fsyntax-only -Wunused-value -verify %s
+
+@interface INTF
+// Currently this is rejected by both GCC and Clang (and Clang was crashing on it).
+- (id) foo __attribute__((warn_unused_result)); // expected-warning{{warning: 'warn_unused_result' attribute only applies to function types}}
+@end
+
+