[cfe-dev] Fix for PR4701

[steve naroff]

Hi David,

If you can include a test case that demonstrate what this patch fixes,  
I believe I can give you a better approach...

Thanks,

snaroff

On Aug 14, 2009, at 4:56 PM, David Chisnall wrote:

> Hi Everyone,
>
> This patch provides an actual fix (as opposed to my previous  
> attempt, which just moved the bugs around) for PR4701, where code  
> accessing fields declared on Objective-C pseudo-builtin types id and  
> Class broke.
>
> With this patch applied, all test pass and programs that include the  
> GNU runtime's <obj/objc-api.h> compile correctly.
>
> I am not totally convinced by the approach here.  If a redefinition  
> of id or Class is encountered, this is stored any any attempt to  
> access a field on one of these builtins is then implicitly cast to  
> the real type.  This is quite ugly, but seems less ugly than doing  
> it the other way around (adding special cases to all of the  
> Objective-C stuff to let struct objc_object* act as a receiver, and  
> so on).
>
> David
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