jroelofs added a comment.

In http://reviews.llvm.org/D11963#227444, @EricWF wrote:

> I also just realized that this change will currently likely play havoc with 
> how libc++ and libc++abi build together. In order to build libc++ and 
> libc++abi together we would need to
>
> 1. Configure libc++ pointing to the libc++abi headers in order to generate 
> the __config_site file.
> 2. Configure libc++abi pointing it to the libc++ build directory for the 
> headers.
> 3. build libc++abi
> 4. build libc++
>
>   I'm not quite sure how this would work for an in-tree build.


This patch, combined with http://reviews.llvm.org/D11964, works the way you 
describe.

> However if we do things as I suggested above we can keep the current two step 
> build process.





http://reviews.llvm.org/D11963



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