build.yml

name: Cross-compile IMEX on CPUs

on:
  push:
    branches:
      - main
  pull_request:
    branches:
      - main

permissions: read-all

jobs:
  build_linux:
    name: Builds IMEX on Linux
    runs-on: ubuntu-latest
    defaults:
      run:
        shell: bash -l -eo pipefail {0}

    strategy:
      matrix:
        python: [3.9]

    steps:
      - name: Cancel Previous Runs
        uses: styfle/cancel-workflow-action@0.12.1
        with:
          access_token: ${{ github.token }}

      - name: Setup conda
        uses: conda-incubator/setup-miniconda@v3
        with:
          auto-update-conda: true
          python-version: ${{ matrix.python }}
          activate-environment: imex-devel

      - name: Conda info
        run: conda info

      - name: Install Build tools
        run: |
          conda install cmake ninja conda-forge::lit conda-forge::doxygen
          conda list

      - name: Checkout repo
        uses: actions/checkout@v4

      - name: Setup Cache Vars
        run: |
          echo LLVM_SHA=$(cat build_tools/llvm_version.txt) | tee -a $GITHUB_ENV

      - name: Cache LLLVM-MLIR
        id: cache-llvm-mlir
        uses: actions/cache@v4
        env:
          LLVM_CACHE_NUMBER: 2  # Increase to reset cache
        with:
          path: |
            ${{ github.workspace }}/mlir
          key: ${{ runner.os }}-build-llvm-${{ env.LLVM_CACHE_NUMBER }}-${{ env.LLVM_SHA }}

      - name: Build LLVM-MLIR
        if: steps.cache-llvm-mlir.outputs.cache-hit != 'true'
        run: |
          git clone https://github.com/llvm/llvm-project --branch main --single-branch
          cd llvm-project
          git checkout $LLVM_SHA
          git apply ../build_tools/patches/*.patch

          echo "INFO: Need to rebuild LLVM-MLIR. Previous installation for MLIR not found"
          cmake -G Ninja -B build -S llvm                                  \
            -DCMAKE_BUILD_TYPE=MinSizeRel                                  \
            -DLLVM_ENABLE_PROJECTS=mlir                                    \
            -DLLVM_ENABLE_ASSERTIONS=ON                                    \
            -DLLVM_USE_LINKER=gold                                         \
            -DLLVM_INSTALL_UTILS=ON                                        \
            -DLLVM_TARGETS_TO_BUILD=X86                                    \
            -DLLVM_ENABLE_BINDINGS=OFF                                     \
            -DLLVM_ENABLE_ZSTD=OFF                                         \
            -DCMAKE_INSTALL_PREFIX=${{ github.workspace }}/mlir
          cmake --build build --target install

      - name: Build IMEX and run lit tests
        shell: bash -le {0}
        run: |
          ./scripts/compile.sh -DLLVM_LIT_ARGS="-a" -DLLVM_EXTERNAL_LIT=$(which lit) -DMLIR_DIR=${{ github.workspace }}/mlir/lib/cmake/mlir
          cmake --build build --target check-imex

      - name: Build doxygen docs
        shell: bash -le {0}
        run: |
          cmake --build build --target doc_doxygen