Matthias Krüger f7c7e34ae4 Rollup merge of #146886 - taiki-e:rc-inner-align, r=Mark-Simulacrum ...

Add repr(align(2)) to RcInner and ArcInner

`Rc` currently assumes that `RcInner` has at least 2-byte alignment, but on AVR, `usize` has 1-byte alignment (this is because the AVR has 1-byte register sizes, so having 2-byte alignment is generally useless), breaking this assumption.

https://github.com/rust-lang/rust/blob/9f32ccf35fb877270bc44a86a126440f04d676d0/library/alloc/src/rc.rs#L3005-L3008

This PR adds `repr(align(2))` to force `RcInner` to always have at least 2-byte alignment.

Note that `ArcInner` doesn't need `repr(align(2))` because atomic types have the alignment same as its size. This PR adds a comment about this.

2025-09-30 20:46:45 +02:00

..

src

Rollup merge of #146886 - taiki-e:rc-inner-align, r=Mark-Simulacrum

2025-09-30 20:46:45 +02:00

Cargo.toml

Add panic=immediate-abort

2025-09-21 13:12:18 -04:00