[cfe-dev] GCC compatibility for Objective-C

[David Chisnall]

Hi,

GCC emits an __objc_class_name_{classname} symbol for every class, and  
a corresponding reference to this symbol for every compilation unit  
that references the class.  This causes linker errors when you try  
linking a program which references some classes but doesn't define  
them.  The attached patch implements this support in clang, so you can  
compile a class with clang, reference it in a file compiled with GCC,  
and have it all work correctly.

David
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