[PATCH] D124489: Deprecate LLVM_BUILD_EXTERNAL_COMPILER_RT

[Dan Liew via Phabricator via cfe-commits]

delcypher added a comment.

I spoke to a few other engineers in Apple. They are

1. Happy for us to proceed with marking `LLVM_BUILD_EXTERNAL_COMPILER_RT` as deprecated.
2. Okay with using `LLVM_BUILD_EXTERNAL_COMPILER_RT` being an error by default that can be downgraded to a warning using a CMake cache option.

@beanz If you can adapt the patch to make the warning into an error with a way to downgrade then I'll happily approve.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D124489/new/

https://reviews.llvm.org/D124489