darwin unused broken in C++

[Mike Stump]

On Nov 16, 2005, at 2:54 PM, Geoffrey Keating wrote:
> Could you make it a lang hook?

Ok, here it is...  I'll check this in later today...  I've ensured  
that C/C++/ObjC/ObjC++ all have the right hook.  Other languages  
don't matter, as they aren't C based.

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