commit 0d5e0422050a642e518800439c4318f7fbab0f04
author Louis Dionne <ldionne@apple.com> Wed Apr 22 16:17:58 2020 -0400
committer Copybara-Service <copybara-worker@google.com> Fri Aug 28 01:05:28 2020 -0700
tree 123e18379e170697460f4dcec6672baee80ee481
parent 49540afcb2847eb8cae843060e941a14b6acc028

[libc++/abi] Provide an option to turn on forgiving dynamic_cast when building libc++abi

Instead of the ad-hoc #define _LIBCXX_DYNAMIC_FALLBACK, provide an option
to enable the setting when building libc++abi. Also use the occasion to
rename the option to something slightly more descriptive.

Note that in the future, it would be great to simply remove this option
altogether. However, in the meantime, it seems better to have it be an
official option than something ad-hoc.

GitOrigin-RevId: e5291c4ae3f7272ca3901d1189d30e23fd578193