gha: test cross-compilation to other arches

Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>

.github/workflows/rust.yml

@@ -57,6 +57,40 @@ jobs:
  toolchain: ${{ env.RUST_MSRV }}
  - run: cargo check --workspace --all-features --all-targets
 
+ check-cross:
+ strategy:
+ fail-fast: false
+ matrix:
+ target:
+ - x86_64-unknown-linux-musl
+ - aarch64-unknown-linux-musl
+ - arm-unknown-linux-gnueabi
+ - arm-unknown-linux-gnueabihf
+ - armv7-unknown-linux-gnueabihf
+ - i686-unknown-linux-gnu
+ - loongarch64-unknown-linux-gnu
+ - loongarch64-unknown-linux-musl
+ - powerpc-unknown-linux-gnu
+ - powerpc64-unknown-linux-gnu
+ - powerpc64le-unknown-linux-gnu
+ - riscv64gc-unknown-linux-gnu
+ - sparc64-unknown-linux-gnu
+ - s390x-unknown-linux-gnu
+ name: cargo check (${{ matrix.target }})
+ runs-on: ubuntu-latest
+ steps:
+ - uses: actions/checkout@v4
+ - uses: dtolnay/rust-toolchain@stable
+ with:
+ # TODO: Should we use MSRV for this?
+ targets: ${{ matrix.target }}
+ - name: cargo check --target=${{ matrix.target }}
+ run: >-
+ cargo check --target=${{ matrix.target }} --workspace --all-features --all-targets
+ - name: cargo build --target=${{ matrix.target }}
+ run: >-
+ cargo build --target=${{ matrix.target }} --release --all-features
+
  rustdoc:
  name: cargo doc
  runs-on: ubuntu-latest
@@ -132,6 +166,7 @@ jobs:
  needs:
  - check
  - check-msrv
+ - check-cross
  - rustdoc
  - test
  - examples
@@ -155,6 +190,7 @@ jobs:
  needs:
  - check
  - check-msrv
+ - check-cross
  - rustdoc
  - test
  - examples

CHANGELOG.md

@@ -15,6 +15,14 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - python bindings: add `Root.creat_raw` to create a new file and wrap it in a
  raw `WrappedFd` (os opposed to `Root.creat` which returns an `os.fdopen`).
 
+### Fixes ###
+- multiarch: we now build correctly on 32-bit architectures as well as
+ architectures that have unsigned char. We also have CI jobs that verify that
+ builds work on a fairly large number of architectures (all relevant tier-1
+ and tier-2-with-host-tools architectures). If there is an architecture you
+ would like us to add to the build matrix and it is well-supported by `rustc`,
+ feel free to open an issue or PR!
+
 ### Changed ###
 - syscalls: switch to rustix for most of our syscall wrappers to simplify how
  much code we have for wrapper raw syscalls. This also lets us build on