EricWF added a comment.

In https://reviews.llvm.org/D24083#534459, @logan wrote:

> One solution might be adding the `libclang_rt.builtins.${arch}.a` detection 
> rules[1] to CMakeLists.txt, and manually specify 
> `-lclang_rt.builtins-${arch}.a` when `LIBCXXABI_USE_COMPILER_RT` is enabled.  
> How do you think about this solution?


That SGTM. There's a similar workaround in libc++ to link the sanitizer 
run-times on OS X (found here 
<https://github.com/llvm-mirror/libcxx/blob/master/lib/CMakeLists.txt#L40>).


https://reviews.llvm.org/D24083



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