`bevy lint` fails badly on systems that have `cranelift` set up with a differing toolchain version

[janhohenheim]

I installed cranelift with rustup component add rustc-codegen-cranelift-preview --toolchain nightly

When I have the following in my ~/.cargo/config.toml:

[unstable]
codegen-backend = true

[profile.dev]
codegen-backend = "cranelift"

# compile deps with llvm still for runtime perf
[profile.dev.package."*"]
codegen-backend = "llvm"

I get the following on bevy lint:

error: failed to find a `codegen-backends` folder in the sysroot candidates:
       * /home/hhh/.rustup/toolchains/nightly-2025-04-03-x86_64-unknown-linux-gnu
       * /home/hhh/.rustup/toolchains/nightly-2025-04-03-x86_64-unknown-linux-gnu

error: could not compile `avian_derive` (lib) due to 1 previous error
warning: build failed, waiting for other jobs to finish...
error: could not compile `avian_derive` (lib) due to 1 previous error
Check failed: exit status: 101.
Error: command `/home/hhh/.cargo/bin/bevy_lint ` exited with status code exit status: 101

Solution

use rustup component add rustc-codegen-cranelift-preview --toolchain nightly-2025-04-03

Maybe this should be documented somewhere?

[TimJentzsch]

I think the first step would be to detect this situation and warn/inform the user, ideally with hints on how to fix the situation.

Of course, ideally we would make the liter work with cranelift as well in the long term.

[janhohenheim]

Update: rustup component add rustc-codegen-cranelift-preview --toolchain nightly-2025-04-03 does the trick. Maybe we can improve the error message?