[bug#46162] [PATCH] staging gnu: Add more tools to rust outputs.

[Jakub Kądziołka]

On Mon Feb 15, 2021 at 7:09 PM CET, John Soo wrote:
> Hi Jakub,
>
> Thanks again for your work on rust.
>
> I cc'd you for feedback on adding the "extended" tools to rust's
> outputs.

I don't think tools beyond rustc and cargo should be included in the
main rust package, as this causes them to be built in each step of the
bootstrap. I believe a better approach would be to define separate
packages for them.

We would have something like

 ;; TODO(staging): Bump this variable to the latest packaged rust.
 (define-public rust rust-1.45)

+(define-public rust-for-tools rust-1.50)

I'm not sure if rustbuild can be convinced to not build the compiler
itself when the version used for the build is the same as the sources'.
If so, defining packages for each tool shouldn't need any guix-side
tricks.

Otherwise, I would define a single rust-tools package with
(outputs '("rustfmt" "clippy" ...)). Perhaps it would help with UX if
rust-tools itself was hidden, and instead the tools would be exposed
with simple packages that expose each tool separately, with a symlink or
similar.

I'll see if I can find some time to try this out this week.

Regards,
Jakub Kądziołka