name: Linux

on: [push, pull_request]

jobs:
  build:
    name: ${{matrix.os}}-${{matrix.build_type}}-${{matrix.lib}}-${{matrix.threading_model}}
    runs-on: ${{matrix.os}}
    defaults:
      run:
        shell: bash -e -o pipefail {0}
    env:
      CCACHE_DIR: ${{github.workspace}}/ccache
      CMAKE_GENERATOR: Ninja
      DEBIAN_FRONTEND: noninteractive
    strategy:
      fail-fast: true
      matrix:
        os:
          - ubuntu-18.04
          - ubuntu-20.04
        build_type:
          - Release
        lib:
          - shared
          - static
        threading_model:
          - CXX_THREADS
          - NO_THREADS
          - OPENMP

    steps:
      - uses: actions/checkout@v2

      - name: Setup Dependencies
        run: |
          sudo apt-get update
          sudo apt-get install -y \
            build-essential \
            ccache \
            cmake \
            libbenchmark-dev \
            libblas-dev \
            libeigen3-dev \
            libgflags-dev \
            libgoogle-glog-dev \
            liblapack-dev \
            libsuitesparse-dev \
            ninja-build

      - name: Cache Build
        id: cache-build
        uses: actions/cache@v2
        with:
          path: ${{env.CCACHE_DIR}}
          key: ${{matrix.os}}-ccache-${{matrix.build_type}}-${{matrix.lib}}-${{matrix.threading_model}}-${{github.run_id}}
          restore-keys: ${{matrix.os}}-ccache-${{matrix.build_type}}-${{matrix.lib}}-${{matrix.threading_model}}-

      - name: Setup Environment
        if: matrix.build_type == 'Release'
        run: |
          echo 'CXXFLAGS=-flto' >> $GITHUB_ENV

      - name: Configure
        run: |
          cmake -S . -B build_${{matrix.build_type}} \
                -DBUILD_SHARED_LIBS=${{matrix.lib == 'shared'}} \
                -DCERES_THREADING_MODEL=${{matrix.threading_model}} \
                -DCMAKE_BUILD_TYPE=${{matrix.build_type}} \
                -DCMAKE_C_COMPILER_LAUNCHER=$(which ccache) \
                -DCMAKE_CXX_COMPILER_LAUNCHER=$(which ccache) \
                -DCMAKE_INSTALL_PREFIX=${{github.workspace}}/install

      - name: Build
        run: |
          cmake --build build_${{matrix.build_type}} \
                --config ${{matrix.build_type}}

      - name: Test
        run: |
          ctest --test-dir build_${{matrix.build_type}} \
                --config ${{matrix.build_type}} \
                --output-on-failure \
                -j$(nproc)

      - name: Install
        run: |
          cmake --build build_${{matrix.build_type}}/ \
                --config ${{matrix.build_type}} \
                --target install