name: LK CI (Clang)

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

on: [ push, pull_request ]

jobs:
  build:
    runs-on: ubuntu-24.04
    strategy:
      fail-fast: false
      matrix:
        toolchain-ver: [14, 15, 16, 17, 18]
        debug: [2, 0]
        project:
          # Note: Clang toolchains do not ship with a compiler-rt (libgcc) for
          # all targets, so we have to restrict this build matrix to targets
          # that build without requiring these functions (i.e. 64-bit targets,
          # since 32-bit ones require functions such as __divdi3).
          - pc-x86-64-test
          - qemu-virt-arm64-test
          - qemu-virt-riscv64-test
          - qemu-virt-riscv64-supervisor-test
    env:
      PROJECT: ${{ matrix.project }}
      TOOLCHAIN_VER: ${{ matrix.toolchain-ver }}
      DEBUG: ${{ matrix.debug }}
      UBSAN: 0  # UBSan runtimes for baremetal are not part of the toolchain
    steps:
    - name: banner
      shell: bash
      run: |
        printf "Building with %d processors\n" "$(nproc)"
        grep -oP '(?<=model name\t: ).*' /proc/cpuinfo|head -n1
        echo PROJECT = $PROJECT
        echo TOOLCHAIN_VER = $TOOLCHAIN_VER
        echo DEBUG = $DEBUG
        echo UBSAN = $UBSAN

    - name: checkout
      uses: actions/checkout@v4

    # Install LLVM and set up the required environment variables
    - name: compute toolchain
      shell: bash
      run: |
        sudo apt-get install -y clang-${{ matrix.toolchain-ver }} lld-${{ matrix.toolchain-ver }}
        GCC_TOOLCHAIN_PREFIX=$(make list-toolchain | grep TOOLCHAIN_PREFIX | tail -1 | cut -d ' ' -f 3)
        # Map the GCC toolchain prefix to a clang --target argument:
        CLANG_TRIPLE=$(echo "${GCC_TOOLCHAIN_PREFIX}" | sed 's/-elf-/-unknown-elf/g')
        LLVM_BINDIR=/usr/lib/llvm-${{ matrix.toolchain-ver }}/bin
        echo "CC=${LLVM_BINDIR}/clang --target=${CLANG_TRIPLE}" >> $GITHUB_ENV
        echo "LD=${LLVM_BINDIR}/ld.lld" >> $GITHUB_ENV
        echo "OBJDUMP=${LLVM_BINDIR}/llvm-objdump" >> $GITHUB_ENV
        echo "OBJCOPY=${LLVM_BINDIR}/llvm-objcopy" >> $GITHUB_ENV
        echo "CPPFILT=${LLVM_BINDIR}/llvm-cxxfilt" >> $GITHUB_ENV
        echo "SIZE=${LLVM_BINDIR}/llvm-size" >> $GITHUB_ENV
        echo "NM=${LLVM_BINDIR}/llvm-nm" >> $GITHUB_ENV
        echo "STRIP=${LLVM_BINDIR}/llvm-strip" >> $GITHUB_ENV
        echo "TOOLCHAIN_PREFIX=/invalid/prefix/should/not/be/used" >> $GITHUB_ENV
        echo "LIBGCC=" >> $GITHUB_ENV
        cat "$GITHUB_ENV"

    # build it
    - name: build
      shell: bash
      run: |
        make -j $(nproc)
    # When LK is compiled with DEBUG=0, there's no console and no way for us
    # to read test output
    - name: qemu
      if: ${{ matrix.project == 'qemu-virt-arm64-test' }}
      shell: bash
      run: |
        env -i DEBIAN_FRONTEND=noninteractive sudo apt-get install -y qemu-system-arm
    - name: unittest
      if: ${{ matrix.project == 'qemu-virt-arm64-test' }}
      shell: bash
      run: |
        python3 scripts/unittest.py

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