name: CI Checks

permissions:
  contents: read

on:
  pull_request:
    types:
      - opened
      - synchronize
      - reopened
      # When a PR is closed, we still start this workflow, but then skip
      # all the jobs, which makes it effectively a no-op.  The reason to
      # do this is that it allows us to take advantage of concurrency groups
      # to cancel in progress CI jobs whenever the PR is closed.
      - closed
  push:
    branches:
      - 'release/**'

concurrency:
  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.sha }}
  cancel-in-progress: true

jobs:
  premerge-checks-linux:
    name: Build and Test Linux
    if: >-
        github.repository_owner == 'llvm' &&
        (github.event_name != 'pull_request' || github.event.action != 'closed')
    runs-on: llvm-premerge-linux-runners
    steps:
      - name: Checkout LLVM
        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
        with:
          fetch-depth: 2
      - name: Setup ccache
        uses: hendrikmuhs/ccache-action@a1209f81afb8c005c13b4296c32e363431bffea5 # v1.2.17
        with:
          max-size: "2000M"
      - name: Build and Test
        # Mark the job as a success even if the step fails so that people do
        # not get notified while the new premerge pipeline is in an
        # experimental state.
        run: |
          git config --global --add safe.directory '*'

          source <(git diff --name-only HEAD~1...HEAD | python3 .ci/compute_projects.py)

          if [[ "${projects_to_build}" == "" ]]; then
            echo "No projects to build"
            exit 0
          fi

          echo "Building projects: ${projects_to_build}"
          echo "Running project checks targets: ${project_check_targets}"
          echo "Building runtimes: ${runtimes_to_build}"
          echo "Running runtimes checks targets: ${runtimes_check_targets}"
          echo "Running runtimes checks requiring reconfiguring targets: ${runtimes_check_targets_needs_reconfig}"

          export CC=/opt/llvm/bin/clang
          export CXX=/opt/llvm/bin/clang++

          ./.ci/monolithic-linux.sh "${projects_to_build}" "${project_check_targets}" "${runtimes_to_build}" "${runtimes_check_targets}" "${runtimes_check_targets_needs_reconfig}"
      - name: Upload Artifacts
        uses: actions/upload-artifact@65c4c4a1ddee5b72f698fdd19549f0f0fb45cf08 # v4.6.0
        with:
          name: Premerge Artifacts (Linux)
          path: artifacts/
          retention-days: 5
          include-hidden-files: 'true'

  premerge-checks-windows:
    name: Build and Test Windows
    if: >-
        github.repository_owner == 'llvm' &&
        (github.event_name != 'pull_request' || github.event.action != 'closed')
    runs-on: llvm-premerge-windows-runners
    defaults:
      run:
        shell: bash
    steps:
      - name: Checkout LLVM
        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
        with:
          fetch-depth: 2
      - name: Setup ccache
        uses: hendrikmuhs/ccache-action@a1209f81afb8c005c13b4296c32e363431bffea5 # v1.2.17
        with:
          variant: "sccache"
          max-size: "2000M"
      - name: Compute Projects
        id: vars
        run: |
          source <(git diff --name-only HEAD~1...HEAD | python .ci/compute_projects.py)

          if [[ "${projects_to_build}" == "" ]]; then
            echo "No projects to build"
          fi

          echo "Building projects: ${projects_to_build}"
          echo "Running project checks targets: ${project_check_targets}"

          echo "windows-projects=${projects_to_build}" >> $GITHUB_OUTPUT
          echo "windows-check-targets=${project_check_targets}" >> $GITHUB_OUTPUT
      - name: Build and Test
        # Mark the job as a success even if the step fails so that people do
        # not get notified while the new premerge pipeline is in an
        # experimental state.
        if: ${{ steps.vars.outputs.windows-projects != '' }}
        shell: cmd
        run: |
          set MAX_PARALLEL_COMPILE_JOBS=64
          set MAX_PARALLEL_LINK_JOBS=64
          call C:\\BuildTools\\Common7\\Tools\\VsDevCmd.bat -arch=amd64 -host_arch=amd64
          bash .ci/monolithic-windows.sh "${{ steps.vars.outputs.windows-projects }}" "${{ steps.vars.outputs.windows-check-targets }}"
      - name: Upload Artifacts
        uses: actions/upload-artifact@65c4c4a1ddee5b72f698fdd19549f0f0fb45cf08 # v4.6.0
        with:
          name: Premerge Artifacts (Windows)
          path: artifacts/
          retention-days: 5
          include-hidden-files: 'true'

  premerge-check-macos:
    name: MacOS Premerge Checks
    runs-on: macos-14
    if: >-
      github.repository_owner == 'llvm' &&
      (startswith(github.ref_name, 'release/') ||
       startswith(github.base_ref, 'release/')) &&
      (github.event_name != 'pull_request' || github.event.action != 'closed')
    steps:
      - name: Checkout LLVM
        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
        with:
          fetch-depth: 2
      - name: Setup ccache
        uses: hendrikmuhs/ccache-action@a1209f81afb8c005c13b4296c32e363431bffea5 # v1.2.17
        with:
          max-size: "2000M"
      - name: Install Ninja
        uses: llvm/actions/install-ninja@main
      - name: Build and Test
        run: |
          source <(git diff --name-only HEAD~2..HEAD | python3 .ci/compute_projects.py)

          if [[ "${projects_to_build}" == "" ]]; then
            echo "No projects to build"
            exit 0
          fi

          echo "Building projects: ${projects_to_build}"
          echo "Running project checks targets: ${project_check_targets}"

          # -DLLVM_DISABLE_ASSEMBLY_FILES=ON is for
          # https://github.com/llvm/llvm-project/issues/81967
          # Disable sharding in lit so that the LIT_XFAIL environment var works.
          cmake -G Ninja \
                -B build \
                -S llvm \
                -DLLVM_ENABLE_PROJECTS="${projects_to_build}" \
                -DLLVM_DISABLE_ASSEMBLY_FILES=ON \
                -DCMAKE_BUILD_TYPE=Release \
                -DLLDB_INCLUDE_TESTS=OFF \
                -DLLVM_ENABLE_ASSERTIONS=ON \
                -DCMAKE_C_COMPILER_LAUNCHER=ccache \
                -DCMAKE_CXX_COMPILER_LAUNCHER=ccache

          # The libcxx tests fail, so we are skipping the runtime targets.
          ninja -C build ${project_check_targets}