main.yml

name: CI
on: [push, pull_request]

env:
  RUSTDOCFLAGS: -Dwarnings
  RUSTFLAGS: -Dwarnings
  RUST_LLVM_VERSION: 19.1-2024-09-17
  RUST_COMPILER_RT_ROOT: ./compiler-rt

jobs:
  test:
    name: Test
    runs-on: ${{ matrix.os }}
    strategy:
      fail-fast: false
      matrix:
        include:
        - target: aarch64-apple-darwin
          os: macos-latest
          rust: nightly
        - target: aarch64-unknown-linux-gnu
          os: ubuntu-latest
          rust: nightly
        - target: aarch64-pc-windows-msvc
          os: windows-latest
          rust: nightly
          test_verbatim: 1
          no_std: 1
        - target: arm-unknown-linux-gnueabi
          os: ubuntu-latest
          rust: nightly
        - target: arm-unknown-linux-gnueabihf
          os: ubuntu-latest
          rust: nightly
        - target: i586-unknown-linux-gnu
          os: ubuntu-latest
          rust: nightly
        - target: i686-unknown-linux-gnu
          os: ubuntu-latest
          rust: nightly
        # MIPS targets disabled since they are dropped to tier 3.
        # See https://github.com/rust-lang/compiler-team/issues/648
        #- target: mips-unknown-linux-gnu
        #  os: ubuntu-latest
        #  rust: nightly
        #- target: mips64-unknown-linux-gnuabi64
        #  os: ubuntu-latest
        #  rust: nightly
        #- target: mips64el-unknown-linux-gnuabi64
        #  os: ubuntu-latest
        #  rust: nightly
        #- target: mipsel-unknown-linux-gnu
        #  os: ubuntu-latest
        #  rust: nightly
        - target: powerpc-unknown-linux-gnu
          os: ubuntu-latest
          rust: nightly
        - target: powerpc64-unknown-linux-gnu
          os: ubuntu-latest
          rust: nightly
        - target: powerpc64le-unknown-linux-gnu
          os: ubuntu-latest
          rust: nightly
        - target: riscv64gc-unknown-linux-gnu
          os: ubuntu-latest
          rust: nightly
        - target: thumbv6m-none-eabi
          os: ubuntu-latest
          rust: nightly
        - target: thumbv7em-none-eabi
          os: ubuntu-latest
          rust: nightly
        - target: thumbv7em-none-eabihf
          os: ubuntu-latest
          rust: nightly
        - target: thumbv7m-none-eabi
          os: ubuntu-latest
          rust: nightly
        - target: wasm32-unknown-unknown
          os: ubuntu-latest
          rust: nightly
        - target: x86_64-unknown-linux-gnu
          os: ubuntu-latest
          rust: nightly
        - target: x86_64-apple-darwin
          os: macos-13
          rust: nightly
        - target: i686-pc-windows-msvc
          os: windows-latest
          rust: nightly
          test_verbatim: 1
        - target: x86_64-pc-windows-msvc
          os: windows-latest
          rust: nightly
          test_verbatim: 1
        - target: i686-pc-windows-gnu
          os: windows-latest
          rust: nightly-i686-gnu
        - target: x86_64-pc-windows-gnu
          os: windows-latest
          rust: nightly-x86_64-gnu
    steps:
    - name: Print runner information
      run: uname -a
    - uses: actions/checkout@v4
      with:
        submodules: true
    - name: Install Rust (rustup)
      run: rustup update ${{ matrix.rust }} --no-self-update && rustup default ${{ matrix.rust }}
      shell: bash
    - run: rustup target add ${{ matrix.target }}
    - run: rustup component add llvm-tools-preview
    - uses: Swatinem/rust-cache@v2
      with:
        key: ${{ matrix.target }}
    - name: Cache Docker layers
      uses: actions/cache@v2
      if: matrix.os == 'ubuntu-latest'
      with:
        path: /tmp/.buildx-cache
        key: ${{ matrix.target }}-buildx-${{ github.sha }}
        restore-keys: ${{ matrix.target }}-buildx-
        
    - name: Cache compiler-rt
      id: cache-compiler-rt
      uses: actions/cache@v4
      with:
        path: compiler-rt
        key: ${{ runner.os }}-compiler-rt-${{ env.RUST_LLVM_VERSION }}
    - name: Download compiler-rt reference sources
      if: steps.cache-compiler-rt.outputs.cache-hit != 'true'
      run: |
        curl -L -o code.tar.gz "https://github.com/rust-lang/llvm-project/archive/rustc/${RUST_LLVM_VERSION}.tar.gz"
        tar xzf code.tar.gz --strip-components 1 llvm-project-rustc-${RUST_LLVM_VERSION}/compiler-rt
      shell: bash

    # Non-linux tests just use our raw script
    - run: ./ci/run.sh ${{ matrix.target }}
      if: matrix.os != 'ubuntu-latest'
      shell: bash
      env:
        NO_STD: ${{ matrix.no_std }}
        TEST_VERBATIM: ${{ matrix.test_verbatim }}

    # Configure buildx to use Docker layer caching
    - uses: docker/setup-buildx-action@v3
      if: matrix.os == 'ubuntu-latest'

    # Otherwise we use our docker containers to run builds
    - run: cargo generate-lockfile && ./ci/run-docker.sh ${{ matrix.target }}
      if: matrix.os == 'ubuntu-latest'

    # Workaround to keep Docker cache smaller
    # https://github.com/docker/build-push-action/issues/252
    # https://github.com/moby/buildkit/issues/1896
    - name: Move Docker cache
      if: matrix.os == 'ubuntu-latest'
      run: |
        rm -rf /tmp/.buildx-cache
        mv /tmp/.buildx-cache-new /tmp/.buildx-cache

  rustfmt:
    name: Rustfmt
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v4
      with:
        submodules: true
    - name: Install stable `rustfmt`
      run: rustup set profile minimal && rustup default stable && rustup component add rustfmt
    - run: cargo fmt -- --check

  clippy:
    name: Clippy
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v4
      with:
        submodules: true
    # Unlike rustfmt, stable clippy does not work on code with nightly features.
    # This acquires the most recent nightly with a clippy component.
    - name: Install nightly `clippy`
      run: |
        rustup set profile minimal && rustup default "nightly-$(curl -s https://rust-lang.github.io/rustup-components-history/x86_64-unknown-linux-gnu/clippy)" && rustup component add clippy
    - uses: Swatinem/rust-cache@v2
    - run: cargo clippy -- -D clippy::all

  success:
    needs:
      - test
      - rustfmt
      - clippy
    runs-on: ubuntu-latest
    # GitHub branch protection is exceedingly silly and treats "jobs skipped because a dependency
    # failed" as success. So we have to do some contortions to ensure the job fails if any of its
    # dependencies fails.
    if: always() # make sure this is never "skipped"
    steps:
      # Manually check the status of all dependencies. `if: failure()` does not work.
      - name: check if any dependency failed
        run: jq --exit-status 'all(.result == "success")' <<< '${{ toJson(needs) }}'