AVR Applications using the heapless crate fail to compile

[mutantbob]

If you create an AVR project using cargo generate --git https://github.com/Rahix/avr-hal-template.git and add a dependency on heapless (0.7.16) compilation triggers an error

error: cannot find macro `llvm_asm` in this scope
   --> /home/thoth/.cargo/registry/src/github.com-1ecc6299db9ec823/critical-section-0.2.7/src/lib.rs:127:13
    |
127 |             llvm_asm!(
    |             ^^^^^^^^

This is because heapless depends on atomic-polyfill v0.1.10 which depends on critical-section v0.2.7 which uses the obsolete llvm_asm! macro.

Upgrading heapless to use atomic-polyfill 1.0.0 or later resolves this issue.

[booo]

As far as I can see this was solved in b0e4cb8.

I would appreciate a new release with this change so we can start integrating it in other projects.

[rihardsk]

Hey, sorry to bother, but is there anything specific preventing a new release being created? It would be great to have this fixed so that downstream projects can benefit.

[newAM]

This should be fixed on the main branch, feel free to re-open if not.

This isn't in a release yet, but we're working on that, tracking issue #373