name: LK CI (gcc)

# Brute force build a bunch of variants of LK in parallel jobs.

on:
  pull_request:
  push:
    branches-ignore:
      - 'wip/**'
      - 'docs/**' # Skip builds for documentation branches
    paths-ignore:
      - '**.md'   # Skip builds when only markdown files change
      - 'docs/**' # Skip builds for docs directory changes

jobs:
  build:
    runs-on: ubuntu-24.04
    strategy:
      fail-fast: false
      matrix:
        toolchain-ver: [15.2.0, 7.5.0]
        debug: [2, 0]
        ubsan: [1, 0]
        arch:
          - arm
          - arm64
          - m68k
          - microblaze
          - mips
          - or1k
          - riscv32
          - riscv64
          - x86
        exclude:
          # no real point building ubsan on the old compiler
          - ubsan: 1
            toolchain-ver: 7.5.0
          # do not build ubsan for older 32bit arches where it is not well supported
          - ubsan: 1
            arch: m68k
          - ubsan: 1
            arch: microblaze
          - ubsan: 1
            arch: mips
          - ubsan: 1
            arch: or1k
          # no toolchain for 7.5.0 for or1k
          - arch: or1k
            toolchain-ver: 7.5.0
          # building newer riscv stuff on 7.5.0 is fairly difficult due to
          # lack of certain extensions
          - arch: riscv32
            toolchain-ver: 7.5.0
          - arch: riscv64
            toolchain-ver: 7.5.0

    env:
      ARCH: ${{ matrix.arch }}
      TOOLCHAIN_VER: ${{ matrix.toolchain-ver }}
      # ${{ matrix.toolchain-arch }}-${{ matrix.toolchain-ver }}-Linux-x86_64
      DEBUG: ${{ matrix.debug }}
      UBSAN: ${{ matrix.ubsan }}
      TOOLCHAIN: # compute below
      TOOLCHAIN_ALT: # compute below
    steps:
    - name: banner
      shell: bash
      run: |
        printf "Building with %d processors\n" "$(nproc)"
        grep -oP '(?<=model name\t: ).*' /proc/cpuinfo|head -n1
        echo ARCH = $ARCH
        echo TOOLCHAIN_VER = $TOOLCHAIN_VER
        echo DEBUG = $DEBUG
        echo UBSAN = $UBSAN

    # check out the source
    - name: checkout
      uses: actions/checkout@v4

    # compute the toolchain prefix this project will need
    - name: compute toolchain
      shell: bash
      run: |
        case "${{ matrix.arch }}" in
            arm) TOOLCHAIN_PREFIX="arm-eabi-" ;;
            arm64) TOOLCHAIN_PREFIX="aarch64-elf-" ;;
            m68k) TOOLCHAIN_PREFIX="m68k-elf-" ;;
            microblaze) TOOLCHAIN_PREFIX="microblaze-elf-" ;;
            mips) TOOLCHAIN_PREFIX="mips-elf-" ;;
            or1k) TOOLCHAIN_PREFIX="or1k-elf-" ;;
            riscv32) TOOLCHAIN_PREFIX="riscv32-elf-" ;;
            riscv64) TOOLCHAIN_PREFIX="riscv64-elf-" ;;
            x86) TOOLCHAIN_PREFIX="x86_64-elf-" ;;
            *) echo "Unknown architecture: ${{ matrix.arch }}" && exit 1 ;;
        esac
        echo "TOOLCHAIN_PREFIX=${TOOLCHAIN_PREFIX}" >> $GITHUB_ENV
        echo "TOOLCHAIN=${TOOLCHAIN_PREFIX}${{ matrix.toolchain-ver }}-$(uname)-$(uname -m)" >> $GITHUB_ENV
        if [ "$TOOLCHAIN_PREFIX" = "x86_64-elf-" ]; then
          # for some x86_64-elf projects, we need i386-elf as well
          echo "TOOLCHAIN_ALT=i386-elf-${{ matrix.toolchain-ver }}-$(uname)-$(uname -m)" >> $GITHUB_ENV
        fi

    # maintain a directory archives/ in the repo
    # it will contain tarballs of various toolchains
    - name: cache
      uses: actions/cache@v4
      id: cache
      with:
        # A list of files, directories, and wildcard patterns to cache and restore
        path: archives
        # An explicit key for restoring and saving the cache
        key: archives-${{ env.TOOLCHAIN }}-${{ env.TOOLCHAIN_ALT }}

    # download a toolchain from https://newos.org/toolchains
    # if not already cached
    - name: fetch/extract toolchain
      shell: bash
      run: |
        TOOLCHAIN_BASE_URL="https://newos.org/toolchains"
        TOOLCHAIN_SUFFIX="tar.xz"
        TOOLCHAIN_ADDRESS="$TOOLCHAIN_BASE_URL/$TOOLCHAIN.$TOOLCHAIN_SUFFIX"
        mkdir -p archives
        cd archives
        echo "Downloading toolchain $TOOLCHAIN from $TOOLCHAIN_ADDRESS"
        wget -v -N $TOOLCHAIN_ADDRESS || exit 1
        cd ..
        echo "Unpacking $TOOLCHAIN"
        tar xf archives/$TOOLCHAIN.$TOOLCHAIN_SUFFIX || exit 1
        echo "$GITHUB_WORKSPACE/$TOOLCHAIN/bin" >> $GITHUB_PATH

    # if we have an alternate toolchain, download it too
    - name: fetch/extract alternate toolchain
      if: env.TOOLCHAIN_ALT != ''
      shell: bash
      run: |
        TOOLCHAIN_BASE_URL="https://newos.org/toolchains"
        TOOLCHAIN_SUFFIX="tar.xz"
        TOOLCHAIN_ALT_ADDRESS="$TOOLCHAIN_BASE_URL/$TOOLCHAIN_ALT.$TOOLCHAIN_SUFFIX"
        echo "Downloading alternate toolchain $TOOLCHAIN_ALT from $TOOLCHAIN_ALT_ADDRESS"
        mkdir -p archives
        cd archives
        wget -v -N $TOOLCHAIN_ALT_ADDRESS || exit 1
        cd ..
        echo "Unpacking $TOOLCHAIN_ALT"
        tar xf archives/$TOOLCHAIN_ALT.$TOOLCHAIN_SUFFIX || exit 1
        echo "$GITHUB_WORKSPACE/$TOOLCHAIN_ALT/bin" >> $GITHUB_PATH

    # build it
    - name: build
      shell: bash
      run: |
        export -n TOOLCHAIN_PREFIX
        export -n TOOLCHAIN
        export -n TOOLCHAIN_ALT
        export -n TOOLCHAIN_VER
        export -n ARCH
        # DEBUG is passed through to the build script
        # UBSAN is passed through to the build script
        ./scripts/buildall -e -a "${{ matrix.arch }}"

    # upload artifacts
    #- uses: actions/upload-artifact@v2
    #  with:
    #   name: build-dir
    #   path: build-${{ matrix.project }}/lk.*

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