Why does a subclass @property with no corresponding ivar hide superclass ivars?

Question

The following seems simple enough. There\'s a superclass with an ivar, and a subclass which accesses the (@protected) superclasses ivar:

// Testclass.h    
@         


        

Answer 1

LLVM compiles the source without complaints, switch to LLVM: Select target → Get Info → Build → C/C++ Compiler Version → LLVM 1.5. From my limited experience it’s a better compiler anyway. No idea why GCC behaves the way it does – interesting catch.

Answer 2

The testIvar undeclared error is actually red herring in this case. This message seems to be caused by testProperty not having a corresponding ivar. To resolve the issue either declare a testProperty ivar in TestSubClass.h or make testProperty @dynamic in TestSubClass.m.