name: Pinned Linux LLVM
description: Reuse the pinned LLVM development distribution across CI jobs
runs:
  using: composite
  steps:
    - uses: actions/cache/restore@v4
      id: llvm
      with:
        path: ${{ runner.temp }}/llvm-22.1.8
        key: llvm-22.1.8-linux-x64-v1
    - name: Install LLVM system libraries
      shell: bash
      run: |
        if ! dpkg-query -W -f='${Status}\n' g++ zlib1g-dev libzstd-dev 2>/dev/null | grep -c '^install ok installed$' | grep -qx 3; then
          sudo apt-get update
          sudo apt-get install --yes g++ zlib1g-dev libzstd-dev
        fi
    - name: Download LLVM
      if: steps.llvm.outputs.cache-hit != 'true'
      shell: bash
      run: |
        curl -fL --connect-timeout 20 --max-time 300 --speed-limit 102400 --speed-time 30 \
          --retry 2 --retry-max-time 600 -o "$RUNNER_TEMP/llvm.tar.xz" \
          https://github.com/llvm/llvm-project/releases/download/llvmorg-22.1.8/LLVM-22.1.8-Linux-X64.tar.xz
        tar -xJf "$RUNNER_TEMP/llvm.tar.xz" -C "$RUNNER_TEMP"
        mv "$RUNNER_TEMP/LLVM-22.1.8-Linux-X64" "$RUNNER_TEMP/llvm-22.1.8"
    - name: Select LLVM
      shell: bash
      run: |
        test "$("$RUNNER_TEMP/llvm-22.1.8/bin/llvm-config" --version)" = 22.1.8
        echo "LLVM_DIR=$RUNNER_TEMP/llvm-22.1.8/lib/cmake/llvm" >> "$GITHUB_ENV"
        echo "$RUNNER_TEMP/llvm-22.1.8/bin" >> "$GITHUB_PATH"
    # Publish setup work before the long tests, including when a later test fails.
    - uses: actions/cache/save@v4
      if: steps.llvm.outputs.cache-hit != 'true'
      with:
        path: ${{ runner.temp }}/llvm-22.1.8
        key: ${{ steps.llvm.outputs.cache-primary-key }}