test_llvm_compat.yml

name: LLVM Compatibility

# apt.llvm.org rebuilds packages from the HEAD of each release branch twice
# daily, so installing a versioned package always tests against the latest
# tip of that branch
#
# Version schedule:
#   Branch cut in Jan/Jul → next added to matrix (release/<ver>.x now exists)
#   Release in Feb/Aug    → both latest and next still run
#   Transition in Mar/Sep → latest bumps, next drops until next branch cut
#
#   Mar 2026 → latest=22   Sep 2026 → latest=23
#   Mar 2027 → latest=24   Sep 2027 → latest=25

on:
  schedule:
    - cron: "0 0 * * 0" # weekly, Sundays at midnight UTC
  workflow_dispatch:

concurrency:
  group: llvm-compatibility
  cancel-in-progress: true

permissions:
  contents: read
  checks: write # required by dorny/test-reporter to post results

jobs:
  # ── Build the test matrix ────────────────────────────────────────────────
  compute-versions:
    runs-on: ubuntu-latest
    outputs:
      matrix: ${{ steps.versions.outputs.matrix }}
    steps:
      - name: Compute LLVM versions
        id: versions
        run: |
          python3 - << 'PYEOF'
          import datetime, subprocess, json, os

          now = datetime.datetime.now(datetime.timezone.utc).date()
          year, month = now.year, now.month

          # "latest" transitions at the start of March and September each year.
          # Before Mar 2026: latest=21.  Each Mar/Sep adds one.
          #
          #   (2026, Jan/Feb) → 21   (2026, Mar-Aug) → 22
          #   (2026, Sep-Dec) → 23   (2027, Jan/Feb) → 23  …
          ANCHOR = 21  # latest just before Mar 2026
          transitions = max(0,
              (year - 2026) * 2
              + (1 if month >= 3 else 0)
              + (1 if month >= 9 else 0)
          )
          latest = ANCHOR + transitions
          next  = latest + 1

          probe = subprocess.run(
              ['git', 'ls-remote', '--heads',
               'https://github.com/llvm/llvm-project.git',
               f'refs/heads/release/{next}.x'],
              capture_output=True, text=True, timeout=60,
          )
          next_branch_exists = probe.returncode == 0 and bool(probe.stdout.strip())

          include = [{"llvm": latest, "role": "llvm-latest"}]
          if next_branch_exists:
              include.append({"llvm": next, "role": "llvm-next"})

          matrix = json.dumps({"include": include})
          with open(os.environ['GITHUB_OUTPUT'], 'a') as fh:
              fh.write(f'matrix={matrix}\n')

          suffix = f'  next={next}' if next_branch_exists else ' (next branch not yet cut)'
          print(f'latest={latest}{suffix}')
          PYEOF

  # ── Build & test ─────────────────────────────────────────────────────────
  build:
    name: Build (${{ matrix.role }} / v${{ matrix.llvm }})
    needs: compute-versions
    runs-on: ubuntu-latest
    timeout-minutes: 120
    strategy:
      fail-fast: false
      matrix: ${{ fromJson(needs.compute-versions.outputs.matrix) }}
    steps:
      - name: Install LLVM v${{ matrix.llvm }} (apt.llvm.org)
        run: |
          sudo apt-get update
          wget -qO /tmp/llvm.sh https://apt.llvm.org/llvm.sh
          chmod +x /tmp/llvm.sh
          sudo /tmp/llvm.sh ${{ matrix.llvm }} all
          echo "LLVM_HOME=/usr/lib/llvm-${{ matrix.llvm }}" >> "$GITHUB_ENV"

      - name: Install Trick dependencies
        run: |
          sudo apt-get install -y \
            bison flex git make maven cmake zip gdb \
            swig curl g++ \
            libx11-dev libxml2-dev libxt-dev \
            libmotif-common libmotif-dev \
            zlib1g-dev libudunits2-dev \
            default-jdk \
            python3-dev python3-pip python3-venv \
            libgtest-dev libgmock-dev

      - name: Checkout repository
        uses: actions/checkout@v6

      - name: Configure Trick
        run: |
          export MAKEFLAGS=-j$(nproc)
          ./configure --with-llvm="$LLVM_HOME"

      - name: Build Trick
        run: |
          export MAKEFLAGS=-j$(nproc)
          export JAVA_HOME=$(dirname $(dirname $(readlink -f $(which java))))
          make

      - name: Test
        run: |
          cd share/trick/trickops/
          python3 -m venv .venv && . .venv/bin/activate && pip3 install -r requirements.txt
          cd ../../../; make test

      - name: Upload Tests
        uses: actions/upload-artifact@v7
        if: always()
        with:
          name: Trick_${{ matrix.role }}
          path: trick_test/*.xml
          if-no-files-found: warn
          retention-days: 7

  # ── Reporting ─────────────────────────────────────────────────────────────
  report:
    name: Report (${{ matrix.role }})
    needs: [compute-versions, build]
    if: always()
    runs-on: ubuntu-latest
    strategy:
      fail-fast: false
      matrix: ${{ fromJson(needs.compute-versions.outputs.matrix) }}
    steps:
      - uses: dorny/test-reporter@v3
        with:
          artifact: Trick_${{ matrix.role }}
          name: Results_Trick_${{ matrix.role }}
          path: "*.xml"
          reporter: java-junit