[PATCH] D54595: [libcxx] Fix libc++ re-exporting logic when Command Line Tools are not installed

[Louis Dionne via Phabricator]

ldionne added a comment.

I tested this on Mojave and High Sierra with and without developer tools installed, but I would appreciate if reviewers could pull this patch, run `ninja check-cxx-abilist` and make sure it passes.


Repository:
  rCXX libc++

https://reviews.llvm.org/D54595