jroelofs added a comment.

In https://reviews.llvm.org/D38599#893990, @jroelofs wrote:
> In https://reviews.llvm.org/D38599#893985, @danalbert wrote:
>
> > In https://reviews.llvm.org/D38599#893903, @jroelofs wrote:
> >
> > > That reminds me... this does need a testcase or two.
> >
> >
> > Oh, also, any test I add is going to fail, since the case I'm trying to 
> > account for here is not the default behavior.
>
>
> That's what an `available_feature` + `// REQUIRES:` is for.


Which should be set (along with -D_LIBCXX_DYNAMIC_FALLBACK (possibly renamed to 
_LIBCXXABI_DYNAMIC_FALLBACK)) via a CMake flag... We shouldn't just be defining 
macros like this in CMAKE_CXX_FLAGS.


https://reviews.llvm.org/D38599



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