name: Test

on:
  push:
    paths-ignore:
      - '**.md'
  schedule:
    # Weekly, at 00:30 UTC on Friday (somewhat randomly chosen).
    - cron: '30 00 * * 5'
  workflow_dispatch:

permissions: {}

jobs:
  test:
    strategy:
      matrix:
        platform: [x86, x64]
        os: [ubuntu-22.04, ubuntu-24.04, ubuntu-26.04, windows-2022, windows-2025]
    runs-on: ${{ matrix.os }}
    name: |
      Test: ${{ matrix.os }} / ${{ matrix.platform }}
    steps:
      - name: Checkout
        uses: actions/checkout@v7
        with:
          persist-credentials: false
      - name: Clean up PATH
        uses: egor-tensin/cleanup-path@v5
        if: runner.os == 'Windows'
      - name: Set up Clang
        uses: $/
        with:
          platform: ${{ matrix.platform }}
          cc: 1
      - name: Build threads.exe
        uses: $/.github/actions/build-threads
      - name: Run threads.exe
        uses: $/.github/actions/run-threads
      - name: Check symlinks
        uses: $/.github/actions/check-cc
      - name: Check lld
        uses: $/.github/actions/check-lld

  test_versions:
    needs: test
    strategy:
      # A weak attempt to please Ubuntu servers:
      max-parallel: 4
      matrix:
        os: [ubuntu-22.04, ubuntu-24.04, ubuntu-26.04]
        version: [11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23]
        exclude:
          - {os: ubuntu-24.04, version: 11}
          - {os: ubuntu-24.04, version: 12}
          - {os: ubuntu-24.04, version: 13}
          - {os: ubuntu-26.04, version: 11}
          - {os: ubuntu-26.04, version: 12}
          - {os: ubuntu-26.04, version: 13}
          - {os: ubuntu-26.04, version: 14}
          - {os: ubuntu-26.04, version: 15}
          - {os: ubuntu-26.04, version: 16}
    runs-on: ${{ matrix.os }}
    name: |
      Version: ${{ matrix.os }} / ${{ matrix.version }}
    steps:
      - name: Checkout
        uses: actions/checkout@v7
        with:
          persist-credentials: false
      - id: setup
        name: Set up Clang
        uses: $/
        with:
          version: ${{ matrix.version }}
          platform: ${{ matrix.platform }}
          cc: 1
      - name: Build threads.exe
        uses: $/.github/actions/build-threads
        with:
          binary: ${{ steps.setup.outputs.clangxx }}
      - name: Run threads.exe
        uses: $/.github/actions/run-threads
      - name: Check symlinks
        uses: $/.github/actions/check-cc
        with:
          version: ${{ matrix.version }}
      - name: Check lld
        uses: $/.github/actions/check-lld
        with:
          version: ${{ matrix.version }}

  release:
    if: github.ref_type == 'tag'
    name: Release
    runs-on: ubuntu-latest
    needs:
      - test
      - test_versions
    permissions:
      contents: write
    steps:
      - name: Checkout
        uses: actions/checkout@v7
        with:
          persist-credentials: false
      - name: Release
        uses: softprops/action-gh-release@v3