llvm_release.yml

name: llvm-release

on:
  workflow_dispatch:
    inputs:
      llvm_version:
        description: "LLVM version (e.g. 22.1.5)"
        required: true
        default: "22.1.5"

env:
  # daslang needs the C-API only; llvm_targets.das initializes exactly these targets
  LLVM_COMMON_FLAGS: >-
    -DCMAKE_BUILD_TYPE=Release
    -DLLVM_ENABLE_ASSERTIONS=OFF
    -DLLVM_ENABLE_Z3_SOLVER=OFF
    -DLLVM_TARGETS_TO_BUILD=X86;AArch64;WebAssembly
    -DLLVM_ENABLE_ZLIB=OFF
    -DLLVM_ENABLE_ZSTD=OFF
    -DLLVM_ENABLE_LIBXML2=OFF
    -DLLVM_ENABLE_CURL=OFF
    -DLLVM_ENABLE_LIBEDIT=OFF
    -DLLVM_ENABLE_HTTPLIB=OFF
    -DLLVM_ENABLE_FFI=OFF
    -DLLVM_ENABLE_LIBPFM=OFF
    -DLLVM_ENABLE_BINDINGS=OFF
    -DLLVM_ENABLE_BACKTRACES=OFF
    -DLLVM_ENABLE_CRASH_OVERRIDES=OFF
    -DLLVM_ENABLE_UNWIND_TABLES=OFF
    -DLLVM_INCLUDE_TESTS=OFF
    -DLLVM_INCLUDE_EXAMPLES=OFF
    -DLLVM_INCLUDE_BENCHMARKS=OFF
    -DLLVM_INCLUDE_DOCS=OFF

jobs:
  build:
    name: ${{ matrix.name }}
    runs-on: ${{ matrix.os }}
    timeout-minutes: 360
    strategy:
      fail-fast: false
      matrix:
        include:
          - name: linux_64
            os: ubuntu-22.04
          - name: linux_arm64
            os: ubuntu-22.04-arm
          - name: mac_arm64
            os: macos-14
          - name: win64
            os: windows-2022
    steps:
      # git clone, not the source tarball: tar on Windows fails to extract
      # symlinks under clang/test and llvm/utils/mlgo-utils; git stores them
      # as plain files when core.symlinks=false
      - name: fetch llvm sources
        shell: bash
        run: git clone --depth 1 --branch llvmorg-${{ inputs.llvm_version }} https://github.com/llvm/llvm-project.git llvm-project

      - name: build LLVM (Linux)
        if: startsWith(matrix.os, 'ubuntu')
        run: |
          set -euxo pipefail
          sudo apt-get update
          sudo apt-get install -y ninja-build lld
          cmake -S llvm-project/llvm -B build -G Ninja \
            $LLVM_COMMON_FLAGS \
            -DLLVM_USE_LINKER=lld \
            -DLLVM_BUILD_LLVM_DYLIB=ON
          ninja -C build LLVM
          SO=$(ls build/lib/libLLVM.so.* | head -n1)
          cp "$SO" LLVM.dll
          strip --strip-unneeded LLVM.dll

      - name: build LLVM (macOS)
        if: startsWith(matrix.os, 'macos')
        run: |
          set -euxo pipefail
          brew install ninja
          cmake -S llvm-project/llvm -B build -G Ninja \
            $LLVM_COMMON_FLAGS \
            -DLLVM_BUILD_LLVM_DYLIB=ON
          ninja -C build LLVM
          cp build/lib/libLLVM.dylib LLVM.dll
          strip -x LLVM.dll

      - uses: ilammy/msvc-dev-cmd@v1
        if: startsWith(matrix.os, 'windows')

      - name: build LLVM (Windows)
        if: startsWith(matrix.os, 'windows')
        shell: bash
        run: |
          set -euxo pipefail
          choco install -y ninja
          cmake -S llvm-project/llvm -B build -G Ninja \
            $LLVM_COMMON_FLAGS \
            -DLLVM_BUILD_LLVM_C_DYLIB=ON \
            -DLLVM_ENABLE_PROJECTS=clang
          ninja -C build LLVM-C clang
          cp build/bin/LLVM-C.dll LLVM.dll
          # clang-cl.exe is a driver alias of clang.exe (dispatch on argv[0])
          if [ -f build/bin/clang-cl.exe ]; then
            cp build/bin/clang-cl.exe .
          else
            cp build/bin/clang.exe clang-cl.exe
          fi

      - name: package
        shell: bash
        run: |
          set -euxo pipefail
          EXTRA=""
          if [ -f clang-cl.exe ]; then EXTRA="clang-cl.exe"; fi
          tar czf ${{ matrix.name }}_llvm.tar.gz LLVM.dll $EXTRA
          # macOS has shasum, not sha256sum
          if command -v sha256sum >/dev/null; then SHA=sha256sum; else SHA="shasum -a 256"; fi
          $SHA ${{ matrix.name }}_llvm.tar.gz | tee ${{ matrix.name }}_llvm.tar.gz.sha256

      - uses: actions/upload-artifact@v4
        with:
          name: ${{ matrix.name }}_llvm
          path: |
            ${{ matrix.name }}_llvm.tar.gz
            ${{ matrix.name }}_llvm.tar.gz.sha256

  release:
    needs: build
    runs-on: ubuntu-22.04
    permissions:
      contents: write
    steps:
      - uses: actions/download-artifact@v4
        with:
          path: artifacts
          merge-multiple: true
      - name: collect sha256
        run: |
          set -euxo pipefail
          cd artifacts
          ls -la
          cat *.sha256 > SHA256SUMS
      - uses: softprops/action-gh-release@v2
        with:
          tag_name: llvm-v${{ inputs.llvm_version }}
          name: LLVM ${{ inputs.llvm_version }} prebuilt
          body_path: artifacts/SHA256SUMS
          files: artifacts/*_llvm.tar.gz
          prerelease: true