[libcxx-commits] [libcxx] [libcxx] Poison memory in variant destroy (PR #101048)

[Vitaly Buka via libcxx-commits]

vitalybuka wrote:

> Gentle ping @vitalybuka. IMO the desired outcome for libc++ is pretty clear, it would be nice if MSAN's behavior could be aligned with it.
> 

> MSAN bug

I guess is intentional, but msan can be improved. As-is __sanitizer_dtor_callback is a function call, so it can be too expensive. Maybe this can be done reasonably efficiently if we inline the call.

BTW. libc++ uses `__sanitizer_annotate_contiguous_container`, and this can probably have a custom Asan support.


https://github.com/llvm/llvm-project/pull/101048