[cfe-dev] Fixing selector types on the GNU runtime

[David Chisnall]

Hi Everyone,

The attached patch modifies CGObjCGNU to take the selector type from  
the front end.  This fixes the crash caused by parts of the code  
expecting a packed structure and parts expecting an unpacked one for  
the selector type.

I've also included some fixes in this patch which turn NULL into  
(void*)0 when it is used as a sentinel in variadic functions.  This  
gets rid of a load of warnings when compiling and stops it breaking on  
64-bit architectures.

David
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