erichkeane added a comment.

In https://reviews.llvm.org/D45383#1062078, @efriedma wrote:

> > I believe it is permissible to implement va_copy and va_end as a function, 
> > isn't it?
>
> I guess you could, in theory, but LLVM doesn't support any targets which do 
> that.


Ok, fair enough.  So is your guidance to identify these 7 builtins (4 builtins 
+ 3 lib builtins) and disallow redeclaring? Or am I missing a more subtle 
solution here?


Repository:
  rC Clang

https://reviews.llvm.org/D45383



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