[CI] First attempt on creating a CI using MacOS and Ubuntu to test th…

…e namespace option

.github/workflows/macos-linux-namespace.yml

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+name: MacOS
+
+# https://www.jeffgeerling.com/blog/2020/running-github-actions-workflow-on-schedule-and-other-events
+on:
+  pull_request:
+    types: [opened, reopened, synchronize]
+  schedule:
+    - cron: '0 2 * * SUN'
+
+# https://stackoverflow.com/questions/66335225/how-to-cancel-previous-runs-in-the-pr-when-you-push-new-commitsupdate-the-curre#comment133398800_72408109
+# https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#concurrency
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref || github.run_id }}
+  cancel-in-progress: true
+
+jobs:
+  build-macos:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: ["ubuntu-latest", "macos-latest"]
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v4
+
+    - name: Print system information
+      run: |
+        sysctl -a | grep machdep.cpu
+        sysctl -a | grep logical
+
+    - name: Print OS information
+      run: system_profiler SPSoftwareDataType
+
+    - name: Install dependencies on macos-latest
+      if: matrix.os == 'macos-latest'
+      run: |
+        brew install libpng libjpeg-turbo libdc1394 opencv pcl librealsense zbar nlohmann-json
+
+    - name: Install dependencies on Ubuntu
+      if: matrix.os == 'ubuntu-latest'
+      run: |
+        sudo apt-get update && sudo apt-get install -y libjpeg-dev libpng-dev libopencv-dev libpcl-dev libx11-dev liblapack-dev libeigen3-dev libv4l-dev libzbar-dev libpthread-stubs0-dev libdc1394-dev nlohmann-json3-dev
+
+    - name: Install dependencies on macos-13
+      # On macos-13 we need to do a specific action
+      # ==> Pouring [email protected]_1.ventura.bottle.tar.gz
+      # Error: The `brew link` step did not complete successfully
+      # The formula built, but is not symlinked into /usr/local
+      # Could not symlink bin/2to3-3.12
+      # Target /usr/local/bin/2to3-3.12
+      # already exists. You may want to remove it:
+      #   rm '/usr/local/bin/2to3-3.12'
+      #
+      # To force the link and overwrite all conflicting files:
+      #   brew link --overwrite [email protected]
+      #
+      # Fix proposed in https://github.com/actions/runner-images/issues/6817
+      if: matrix.os == 'macos-13'
+      run: |
+        brew update
+        brew upgrade || true
+        brew install libpng libjpeg-turbo libdc1394 pcl librealsense zbar nlohmann-json
+        brew install opencv
+
+    - name: Clone visp-images
+      env:
+        BRANCH_NAME: ${{ github.head_ref || github.ref_name }}
+      # https://remarkablemark.org/blog/2022/09/25/check-git-branch-exists-in-remote-repository/
+      run: |
+        git clone --depth 1 https://github.com/lagadic/visp-images ${HOME}/visp-images
+        echo "VISP_INPUT_IMAGE_PATH=$HOME/visp-images" >> $GITHUB_ENV
+        echo ${VISP_INPUT_IMAGE_PATH}
+
+    - name: Clone visp_sample
+      run: |
+        git clone --depth 1 https://github.com/lagadic/visp_sample ${HOME}/visp_sample
+
+    # Openblas location is exported explicitly because openblas is keg-only,
+    # which means it was not symlinked into /usr/local/.
+    - name: Configure CMake
+      if: matrix.os == 'macos-latest'
+      run: |
+        export LDFLAGS="-L/usr/local/opt/openblas/lib"
+        export CPPFLAGS="-I/usr/local/opt/openblas/include"
+        mkdir build
+        cd build
+        cmake .. -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/tmp/usr/local -DCMAKE_VERBOSE_MAKEFILE=ON -DENABLE_VISP_NAMESPACE=ON -DENABLE_EXPLICIT_KEYWORD=ON -DVISP_BUILD_DEPRECATED_FUNCTIONS=OFF
+        cat ViSP-third-party.txt
+
+    - name: Configure CMake
+      if: matrix.os == 'ubuntu-latest'
+      run: |
+        mkdir build
+        cd build
+        cmake .. -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/tmp/usr/local -DCMAKE_VERBOSE_MAKEFILE=ON -DENABLE_VISP_NAMESPACE=ON -DENABLE_EXPLICIT_KEYWORD=ON -DVISP_BUILD_DEPRECATED_FUNCTIONS=OFF
+        cat ViSP-third-party.txt
+
+    - name: Compile
+      working-directory: build
+      run: make -j$(sysctl -n hw.logicalcpu) install
+
+    - name: Run unit tests
+      working-directory: build
+      run: ctest -j$(sysctl -n hw.logicalcpu) --output-on-failure -V