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Xcode 4.3 doesn't warn about undeclared methods when they exist in the current @implementation , which is a great new feature. However, this is causing an issue in certain circumstances when using my project on Xcode 4.2. How do I re-enable the warnings for undeclared methods? For example: @interface MashTun : NSObject - (void)foo; @end @implementation MashTun - (void)foo { CGRect rect = [self smallRect]; NSLog(@"My Small Rect: %@", NSStringFromCGRect(rect)); } - (CGRect)smallRect { return CGRectMake(0, 0, 100, 100); } @end In Xcode 4.2, this fails: warning: instance method '-smallRect' not found (return type defaults to 'id') error: initializing 'CGRect' (aka 'struct CGRect') with an expression of incompatible type 'id' I completely understand the warning and error in Xcode 4.2 since it's not allowing the search for methods within the current @implementation scope. (The fix is simple: either put the smallRect method above the foo method, or declare the smallRect method in a category or the header. ) But how do I turn on a warning in Xcode 4.3 to catch this error before passing it on to colleagues running 4.2?

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