MCP: repr(align(ptr))

[Lokathor]

The AtomicPtr type needs three lines of cfg_attr just to try and say what it really wants to say, "I am aligned to the size of a pointer". This is slightly silly, and what's worse it's actually a little error prone because if the pointer width were ever smaller (unlikely) or larger (not impossible) then suddenly none of the cfg_attr would apply and not only would it not have the right alignment it wouldn't even have repr(C), which could make other code that assumes AtomicPtr has repr(C) also suddenly be UB.

Conclusion the align() attribute should allow a value of ptr to request pointer alignment for your type in a "blessed" portable way.

[rustbot]

This issue is not meant to be used for technical discussion. There is a Zulip stream for that. Use this issue to leave procedural comments, such as volunteering to review, indicating that you second the proposal (or third, etc), or raising a concern that you would like to be addressed.

[nikomatsakis]

Since @scottmcm has assigned themselves as liaison, the next step here is to author a charter.

[Lokathor]

Can do, though I'll wait for the PR that has the charter template in it to actually merge first.