On Sat, 2022-06-18 at 22:33 +0200, Miguel Ojeda wrote:
> The effort to add Rust support to the kernel is ongoing. There has
> been progress in different areas during the last year, and there are
> several topics that could benefit from discussion:
> 
>   - Dividing the `kernel` crate into pieces, dependency management
> between internal crates, writing crates in the rest of the kernel
> tree, etc.
> 
>   - Whether to allow dependencies on external crates and vendoring of
> useful third-party crates.
> 
>   - Toolchain requirements in the future and status of Rust unstable features.
> 

This one is a constant pain point for me in another project which
combines C and Rust code. We are constantly being told "of *course*
that doesn't work; you haven't updated your Rust toolchain for a whole
week!"

It also makes bisection basically impossible at times, because during
bisection we find that older code doesn't build with the *new*
toolchain either.

I think we need to set *very* clear rules and expectations about how
many times a decade it's permitted to require a new rust toolchain.