Hello, I opened a PR here: https://github.com/gentoo/gentoo/pull/9388
Here a copy of the message: # add support for rust multi-target - add rust.eclass (with rust-utils.class) to support rust multi-target with multibuild - modify cargo.class to support rust multi-target - change dev-lang/rust slot system This will allows projects like rustfmt, clippy, bindgen that need runtime linking with the proper rust version to work correctly. Beyond this while rust is getting older as project we will see more projects that will require a specific rust version for compilation. This PR replaces the need for rustup in gentoo for toolchain handling and components. requires: - [features in cargo-ebuild](https://github.com/cardoe/cargo-ebuild/pull/14/commits/1aefd302f9430c0b628923da23e2a8d74b83d1ec) - [binaries support into eselect-rust](https://github.com/jauhien/eselect-rust/pull/4) see first discussion on [gentoo-rust](https://github.com/gentoo/gentoo-rust/pull/362)
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