[Bug libstdc++/87544] alloc-size-larger-than incorrectly triggered

[glisse at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87544

--- Comment #10 from Marc Glisse <glisse at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #9)
> Do we want something like this as well? (and for malloc_allocator too)

I think so. Changing allocator_traits as LWG seems likely to agree won't help
much until we remove the deprecated std::allocator::max_size, but since I doubt
we will do that soon, we should update the allocators.

> I added the preprocessor condition because I'm not sure if we can always
> assume that ptrdiff_t and size_t are the same width.

I don't think we can.