[PATCH] D53879: Make libc++'s versioning namespace customizable

[Kristina Brooks via Phabricator]

kristina added a comment.

Maybe as a compromise restrict it to anything that isn't `__[1-9]` since I agree with the comments regarding arbitrary numbering making things difficult with regards to ABI evolution. For example a single letter would work and at the same time ensure it won't clash with future ABI versions.


https://reviews.llvm.org/D53879