Build error for MUSL target

[orhun]

Hello! 🐻

I was using this action to install Rust for my release workflow: https://github.com/orhun/systeroid/blob/af75cefa3933c1ceda6ee292d43fcec353f5e2ae/.github/workflows/cd.yml#L81

However, I got the following error while building for x86_64-unknown-linux-musl target:

error[E0463]: can't find crate for `core`
  |
  = note: the `x86_64-unknown-linux-musl` target may not be installed
  = help: consider downloading the target with `rustup target add x86_64-unknown-linux-musl`
  = help: consider building the standard library from source with `cargo build -Zbuild-std`

error[E0463]: can't find crate for `compiler_builtins`

For more information about this error, try `rustc --explain E0463`.

Full logs: https://github.com/orhun/systeroid/actions/runs/4709456927/jobs/8352603665

I'm already installing musl-tools in the previous step. Do I need to install something else as well?

I switched back to actions-rs/toolchain temporarily and everything worked fine. I'm suspecting this might be due to the usage of actions-rs/cargo for the build step. What do you think?

[dtolnay]

Yeah I don't know what toolchain actions-rs/cargo would be looking for but it isn't this one.

I would not recommend using that action; it is not maintained.

[orhun]

So hold on, what do you suggest that I do here? Just drop actions-rs/cargo and use cargo commands directly?

[rikhuijzer]

I would not recommend using that action; it is not maintained.

I just came across the same issue as @orhun in a different situation while using:

      - uses: dtolnay/rust-toolchain@stable
        with:
          toolchain: 1.69
          targets: 'x86_64-unknown-linux-musl'

[rikhuijzer]

It looks like a rustup issue because the issue persist when installing the target via rustup. Therefore, it looks like closing this issue was the right decision 👍