portable-atomic support for alloc::sync in tracing-core #3173
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hds
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Mar 31, 2025
## Motivation I want to use `bevy_reflect` on `no_std` devices. This platform has alloc, but not atomics, so `alloc::sync` is missing. `bevy_relflect` has a hard depency on `tracing`, and I'd like to use tracing on this platform also. Want to use tracing-core on `no_std` devices like rp2040 without hardware atomics ## Solution - Added `portable-atomic-util` as an optional dependency gated behind a new feature, `portable-atomic` to `tracing-core` - When `portable-atomic` is enabled, switched uses of `Arc` and `Weak` away from `alloc::sync` to `portable_atomic_util`. - Added workaround for a lack of support for [unsized coercion](rust-lang/rust#18598) in custom types. I've included a comment linking to this issue explaining the missing functionality. Fixes #3173
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Feature Request
I want to use bevy_reflect on no_std rp2040. This platform has alloc, but not atomics, so alloc::sync is missing. bevy_relflect has a hard depency on tracing, and I'd like to use tracing on this platform also.
Crates
tracing-core
portable-atomic
bevy_reflect
Motivation
Want to use tracing-core on no_std rp2040 without hardware atomics
Proposal
Since alloc::sync is missing on some no_std platforms, and the "portable-atomic" crate is a drop-in replacement for alloc::sync, integrate portable-atomic.
Alternatives
None that I know of.
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