Add test case to record a couple inconsistencies with GCC (found in <rdar://problem/6561076> [clang on Xcode] warning: cannot find protocol definition for 'OzzyP').

Removing the "cannot find protocol" warning is trivial if necessary (but I don't think it's the right thing to do).

llvm-svn: 65232

clang/test/SemaObjC/protocol-undef.m

@@ -0,0 +1,47 @@
+// RUN: clang -fsyntax-only -verify %s
+
+typedef signed char BOOL;
+@class NSInvocation, NSMethodSignature, NSCoder, NSString, NSEnumerator;
+@protocol NSObject
+- (BOOL)isEqual:(id)object;
+@end
+@protocol NSCoding
+- (void)encodeWithCoder:(NSCoder *)aCoder;
+@end 
+@interface NSObject <NSObject> {} @end
+@class NSArray, NSAttributedString, NSEvent, NSInputServer, NSImage;
+@interface NSController : NSObject <NSCoding> {} @end
+@class OzzyView;
+typedef struct _OzzyInset {} OzzyInset;
+@protocol OzzyP;
+typedef NSObject <OzzyP> Ozzy;
+@protocol OzzyAnchorP;
+typedef NSObject <OzzyAnchorP> OzzyAnchor;
+@protocol OzzyAnchorDelegateP
+- (BOOL)anchor:(OzzyAnchor *)anchor confirmRepresentedObject:(id)newObject;
+@end
+typedef NSObject <OzzyAnchorDelegateP> OzzyAnchorDelegate;
+// GCC doesn't warn about the following (which is inconsistent with it's handling of @interface below).
+@protocol OzzyAnchorP <OzzyP> // expected-warning{{cannot find protocol definition for 'OzzyP'}}
+  @property(nonatomic,retain) id representedObject;
+  @property(nonatomic,retain) Ozzy * contentGroup;
+@end
+@interface XXX : NSObject <OzzyP> // expected-warning{{cannot find protocol definition for 'OzzyP'}}
+@end
+@protocol OzzyActionDelegateP
+  @optional - (BOOL)elementView:(OzzyView *)elementView shouldDragElement:(Ozzy *)element;
+@end
+typedef NSObject <OzzyActionDelegateP> OzzyActionDelegate;
+@interface OzzyUnit : OzzyAnchorDelegate <OzzyAnchorDelegateP> {}
+@end
+@interface OzzyArrayUnit : OzzyUnit {} @end
+@implementation OzzyArrayUnit
+- (BOOL)willChangeLayoutForObjects:(NSArray *)objects fromObjects:(NSArray *)oldObjects {}
+- (void)_recalculateStoredArraysForAnchor:(OzzyAnchor *)anchor {
+  Ozzy * contentGroup = anchor.contentGroup;
+  if (contentGroup == ((void *)0)) {
+    // GCC doesn't warn about the following (which seems wrong).
+    contentGroup = anchor; // expected-warning{{incompatible pointer types assigning 'OzzyAnchor *', expected 'Ozzy *'}}
+  }
+}
+@end