build_openmpi_source.yml

# Build OpenMPI from source using the latest commit on the
# 'main' branch and cache the results. The result is compressed
# into a 'openmpi.tar' archive to preserve permissions and
# then is uploaded as the artifact 'openmpi' which can later
# be downloaded with 'actions/download-artifact' and then
# uncompressed with 'tar xvf openmpi.tar -C <directory>'

# Triggers the workflow on a call from another workflow
on:
  workflow_call:
    inputs:
      build_mode:
        description: "Release vs. Debug build"
        required: true
        type: string

permissions:
  contents: read

jobs:
  ubuntu_gcc_build_and_test:
    name: "Build OpenMPI ${{ inputs.build_mode }} (GCC)"

    runs-on: ubuntu-latest

    steps:
      - name: Install Linux dependencies
        run: |
          sudo apt-get update
          sudo apt-get install build-essential libtool libtool-bin

      - name: Get OpenMPI source
        uses: actions/checkout@v4.1.7
        with:
          repository: 'open-mpi/ompi'
          path: 'ompi'
          submodules: recursive

      - name: Get OpenMPI commit hash
        shell: bash
        id: get-sha
        run: |
          cd $GITHUB_WORKSPACE/ompi
          export OPENMPI_SHA=$(git rev-parse HEAD)
          echo "OPENMPI_SHA=$OPENMPI_SHA" >> $GITHUB_ENV
          echo "sha=$OPENMPI_SHA" >> $GITHUB_OUTPUT
          # Output SHA for debugging
          echo "OPENMPI_SHA=$OPENMPI_SHA"

      - name: Cache OpenMPI (GCC) installation
        id: cache-openmpi-ubuntu-gcc
        uses: actions/cache@v4
        with:
          path: ${{ runner.workspace }}/openmpi
          key: ${{ runner.os }}-${{ runner.arch }}-gcc-openmpi-${{ steps.get-sha.outputs.sha }}-${{ inputs.build_mode }}

      - name: Install OpenMPI (GCC) (Release)
        if: ${{ steps.cache-openmpi-ubuntu-gcc.outputs.cache-hit != 'true' && (inputs.build_mode == 'Release') }}
        run: |
          cd $GITHUB_WORKSPACE/ompi
          ./autogen.pl
          ./configure \
            CC=gcc \
            --prefix=${{ runner.workspace }}/openmpi
          make -j2
          make install

      - name: Install OpenMPI (GCC) (Debug)
        if: ${{ steps.cache-openmpi-ubuntu-gcc.outputs.cache-hit != 'true' && (inputs.build_mode == 'Debug') }}
        run: |
          cd $GITHUB_WORKSPACE/ompi
          ./autogen.pl
          ./configure \
            CC=gcc \
            --prefix=${{ runner.workspace }}/openmpi \
            --enable-debug
          make -j2
          make install

      - name: Tar OpenMPI installation to preserve permissions for artifact
        run: tar -cvf openmpi.tar -C ${{ runner.workspace }} openmpi

      - name: Save OpenMPI installation artifact
        uses: actions/upload-artifact@v4
        with:
          name: openmpi
          path: openmpi.tar
          if-no-files-found: error # 'warn' or 'ignore' are also available, defaults to `warn`