[libcxx-commits] [PATCH] D101674: [libc++] [LIBCXX-DEBUG-FIXME] Constexpr char_traits::copy mustn't compare unrelated pointers.

[Arthur O'Dwyer via Phabricator via libcxx-commits]

Quuxplusone planned changes to this revision.
Quuxplusone added a comment.

> We should be able to compare pointers with std::less to solve this problem. [...]
> (will require having some sort of special contract with the compiler that std::less can do that -- this could be done with some sort of builtin)

I agree that that's what WG21 seems to want vendors to do. But that requires coordinating a new pointer-comparison builtin with both Clang and GCC, which is (definitely a good idea but) far above my pay grade. I'm happy to abandon this PR and let someone-not-me pursue the builtin angle...

Discussed offline with @ldionne and decided to sit on this for now, with the intent that someone will pursue adding a builtin at least to Clang.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D101674/new/

https://reviews.llvm.org/D101674