danalbert added a comment.

In https://reviews.llvm.org/D38599#899196, @howard.hinnant wrote:

> Fwiw, I wrote this code.  All of that "fallback" stuff was written to make 
> customer code that was incorrect, but working on OS X 
> -version-that-used-libsupc++ continue to work.  I.e. to be a crutch for 
> incorrect code.  It should all be removed if you no longer want to provide 
> such a crutch.


Android may end up wanting to use it for the same reason. I've backed it out 
for now, but it may end up being something we need since a fair number of NDK 
users (majority, probably) use libsupc++ and that might be a point of pain in 
migrating to libc++abi. Other Linux distros may want it as well, so probably 
worth leaving the code around.


https://reviews.llvm.org/D38599



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