[PATCH] D39462: [Sema] Implement -Wmaybe-tautological-constant-compare for when the tautologicalness is data model dependent

[Petr Hosek via Phabricator via cfe-commits]

phosek added a comment.

FWIW we've already rolled Clang that contains `-Wtautological-constant-compare` to our codebase and we had to set `-Wno-tautological-constant-compare` globally because we were getting bogus warnings in many places, similarly to https://reviews.llvm.org/D41368. If that warning ships as part of Clang 6, it's going to be be a major pain for many users so we really need some solution.


Repository:
  rL LLVM

https://reviews.llvm.org/D39462