cpp_mcp_release.yml

name: cpp-mcp release

# Builds the standalone C++-only MCP server (cpp-mcp) as a self-contained AOT
# bundle per platform and, on a release, uploads each as a release asset.
#
# Triggers:
#   * pull_request (only when the cpp-mcp surface changes) — builds + smoke-tests
#     on linux only, NO upload. Catches breakage at PR time (the cpp-mcp target
#     is OFF in the normal build matrix, so nothing else compiles it).
#   * workflow_dispatch — full matrix build + smoke, NO upload. Manual validation.
#   * release: prereleased — full matrix, uploads cpp-mcp-<os>-<arch>.<ext>
#     alongside the daslang SDK bundles. A dasllama-v* tag is dasllama's own
#     release and cuts no cpp-mcp.
#
# The build is intentionally lean: cpp_main.das requires only daslib + builtin
# modules, so every external module (dasHV/OpenSSL, GLFW, Audio, ...) is disabled
# — no vcpkg/openssl/apt module deps, and a ~360-step build instead of 2000+.
on:
  push:
    branches: [master]
    paths:
      - 'utils/mcp/**'
      - 'utils/common/**'
      - 'ci/make_cpp_mcp_bundle.sh'
      - 'ci/smoke_test_cpp_mcp.sh'
      - '.github/workflows/cpp_mcp_release.yml'
      - 'CMakeLists.txt'
  pull_request:
    paths:
      - 'utils/mcp/**'
      - 'utils/common/**'
      - 'ci/make_cpp_mcp_bundle.sh'
      - 'ci/smoke_test_cpp_mcp.sh'
      - '.github/workflows/cpp_mcp_release.yml'
      - 'CMakeLists.txt'
  workflow_dispatch:
  release:
    types: [prereleased]

defaults:
  run:
    shell: bash

jobs:
  build:
    if: github.event_name != 'release' || !startsWith(github.event.release.tag_name, 'dasllama-')
    runs-on: ${{ matrix.runner }}
    timeout-minutes: 45
    # contents: write for the release upload; actions: write for `gh cache delete` in the sccache refresh step.
    permissions:
      contents: write
      actions: write
    strategy:
      fail-fast: false
      # Vary the matrix by event: a PR builds only linux (a cheap, cross-platform-
      # agnostic gate); dispatch/release build all four. The selection lives here
      # because the `matrix` context is NOT available in a job-level `if` (only
      # github/needs/vars/inputs are), whereas `github` IS available in strategy.
      matrix:
        include: ${{ fromJSON( (github.event_name == 'pull_request' || github.event_name == 'push') && '[{"name":"linux-x86_64","runner":"ubuntu-latest","asset":"cpp-mcp-linux-x86_64","ext":"tar.gz"}]' || '[{"name":"linux-x86_64","runner":"ubuntu-latest","asset":"cpp-mcp-linux-x86_64","ext":"tar.gz"},{"name":"linux-arm64","runner":"ubuntu-24.04-arm","asset":"cpp-mcp-linux-arm64","ext":"tar.gz"},{"name":"darwin-arm64","runner":"macos-14","asset":"cpp-mcp-darwin-arm64","ext":"tar.gz"},{"name":"windows-x64","runner":"windows-latest","asset":"cpp-mcp-windows-x64","ext":"zip"}]' ) }}

    steps:
      - name: SCM Checkout
        uses: actions/checkout@v4

      - name: Install CMake and Ninja
        uses: lukka/get-cmake@latest

      - name: Set up MSVC environment (Windows)
        if: runner.os == 'Windows'
        uses: ilammy/msvc-dev-cmd@v1
        with:
          arch: x64

      # One sccache slot per cell, seeded by the master push. A release builds clean; the Windows
      # cell runs on dispatch and release only, so no master push would seed its slot.
      - uses: ./.github/actions/sccache-slot
        if: github.event_name != 'release' && runner.os != 'Windows'
        with:
          mode: restore
          key: sccache-cpp-mcp-${{ matrix.name }}-Release
          sccache-size: 500M

      - name: Configure + build cpp-mcp
        run: |
          set -eux
          # cpp_main.das needs no external module -> disable them all (no OpenSSL,
          # no GLFW/X11 deps) and skip tests/tutorials/aot-examples + flex/bison
          # (the committed parser is used).
          MODULES_OFF="-DDAS_HV_DISABLED=ON -DDAS_LLVM_DISABLED=ON -DDAS_AUDIO_DISABLED=ON"
          MODULES_OFF="$MODULES_OFF -DDAS_GLFW_DISABLED=ON -DDAS_PUGIXML_DISABLED=ON -DDAS_SQLITE_DISABLED=ON"
          MODULES_OFF="$MODULES_OFF -DDAS_STBIMAGE_DISABLED=ON -DDAS_STDDLG_DISABLED=ON -DDAS_CLANG_BIND_DISABLED=ON"
          MODULES_OFF="$MODULES_OFF -DDAS_TREE_SITTER_DISABLED=ON"
          LEAN="-DDAS_TESTS_DISABLED=ON -DDAS_TUTORIAL_DISABLED=ON -DDAS_AOT_EXAMPLES_DISABLED=ON -DDAS_FLEX_BISON_DISABLED=ON"
          if [[ "${{ runner.os }}" == "Linux" ]]; then
            # Match release.yml: clang avoids GCC's -Wchanges-meaning on
            # AOT-generated structs being treated as an error.
            export CC=clang CXX=clang++
          fi
          cmake --no-warn-unused-cli -B build -G Ninja \
            -DCMAKE_BUILD_TYPE=Release -DDAS_BUILD_CPP_MCP=ON $MODULES_OFF $LEAN
          cmake --build build --target cpp-mcp --parallel

      - name: Assemble and smoke-test bundle
        run: cmake --build build --target check_cpp_mcp_bundle --parallel

      - uses: ./.github/actions/sccache-slot
        if: github.event_name != 'release' && runner.os != 'Windows'
        with:
          mode: save
          key: sccache-cpp-mcp-${{ matrix.name }}-Release

      - name: Package (zip)
        if: runner.os == 'Windows'
        run: |
          mkdir -p artifacts
          # Package from inside dist/ so the zip root is `cpp-mcp/` (matching the
          # tarball's `-C dist cpp-mcp`), not `dist/cpp-mcp/`.
          cd dist && 7z a "../artifacts/${{ matrix.asset }}.zip" cpp-mcp

      - name: Package (tar.gz)
        if: runner.os != 'Windows'
        run: |
          mkdir -p artifacts
          tar -czf "artifacts/${{ matrix.asset }}.${{ matrix.ext }}" -C dist cpp-mcp

      - name: Upload workflow artifact (dispatch / PR inspection)
        if: github.event_name != 'release'
        uses: actions/upload-artifact@v4
        with:
          name: ${{ matrix.asset }}
          path: artifacts/${{ matrix.asset }}.${{ matrix.ext }}
          if-no-files-found: error

      - name: Upload release asset
        if: github.event_name == 'release' && github.event.action == 'prereleased'
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: gh release upload "${{ github.event.release.tag_name }}" "artifacts/${{ matrix.asset }}.${{ matrix.ext }}" --clobber