[PATCH] D53127: Fix missing defines in libc++abi when compiled against libgcc's arm unwind (follow-up of D42242)

[Steffen Kuhn via Phabricator]

stefson added a comment.

todo: use CMake check to check for libgcc arm unwind, and add or don't add defines based on that.


Repository:
  rCXXA libc++abi

https://reviews.llvm.org/D53127