Commits on Feb 28, 2024

1. Make armv6m-atomic-hack less annoying …

   Currently, the `armv6m-atomic-hack` crate is, to use a technical term,
   *annoying*. Its extension traits only exist when `#[cfg(armv6m)]` is
   set. This means that, in downstream crates that wish to _use_
   `armv6m-atomic-hack` to support v6m targets, the extension traits may
   only be imported when `#[cfg(armv6m)]` is set. Because `RUSTFLAGS` cfgs
   don't propagate across dependency boundaries, this means that _each_
   dependent of `armv6m-atomic-hack` must add a build script with a call to
   `build_utils::expose_m_profile()` so that the cfg is set properly when
   building for a v6m board. This is, as previously stated, annoying ---
   especially when using crates like `counters`, whose `#[derive(Count)]`
   attribute expands to a use of `AtomicU32Ext`, and thus requires any
   crate that derives `Count` to add a build script.
   
   This branch changes `armv6m-atomic-hack` so that the extension traits
   `AtomicU32Ext` and `AtomicBoolExt` are always defined, regardless of
   whether `#[cfg(armv6m)]` is set. Now, only the *implementation* of those
   traits differs based on the presence of the `armv6m` cfg --- if it is
   not set, an implementation is provided that simply forwards to the
   corresponding methods on the `AtomicU32` and `AtomicBool` types in
   libcore. This way, dependents of `armv6m-atomic-hack` can just import
   the extension traits without needing to add a build script with
   `expose_m_profile()`; now, only `armv6m-atomic-hack` itself needs the
   build script. Now, the `armv6m-atomic-hack` crate can no longer be
   considered annoying.

   

   hawkw committed Feb 28, 2024
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2. Merge branch 'master' into eliza/less-annoying-atomic-hack

   

   hawkw committed Feb 28, 2024
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