Add C++ CI workflow to GitHub Actions and fix build with Xcode's 12.4…

… C++ compiler (#131)

* Add C++ CI workflow to GitHub Actions

* Update cxx-ci.yml

* Update CMakeLists.txt

* Update cxx-ci.yml

.github/workflows/cxx-ci.yml

@@ -0,0 +1,107 @@
+name: C++ CI Workflow
+
+on:
+  push:
+  pull_request:
+  schedule:
+  # * is a special character in YAML so you have to quote this string
+  # Execute a "nightly" build at 2 AM UTC
+  - cron:  '0 2 * * *'
+
+jobs:
+  build-with-conda-dependencies:
+    name: '[conda:${{ matrix.os }}]'
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        build_type: [Release]
+        os: [ubuntu-20.04, macos-10.15, windows-2019]
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - uses: conda-incubator/setup-miniconda@v2
+      with:
+        miniforge-variant: Mambaforge
+        miniforge-version: latest
+        channels: conda-forge
+
+    - name: Dependencies [Conda]
+      shell: bash -l {0}
+      run: |
+        # Workaround for https://github.com/conda-incubator/setup-miniconda/issues/186
+        conda config --remove channels defaults
+        # Compilation related dependencies
+        mamba install cmake compilers make ninja pkg-config
+
+    - name: Print used environment [Conda]
+      shell: bash -l {0}
+      run: |
+        mamba list
+        env
+
+    - name: Configure [Conda/Linux&macOS]
+      if: contains(matrix.os, 'macos') || contains(matrix.os, 'ubuntu')
+      shell: bash -l {0}
+      run: |
+        mkdir build
+        cd build
+        cmake -GNinja -DCMAKE_BUILD_TYPE=${{ matrix.build_type }} -DCMAKE_INSTALL_PREFIX=${CONDA_PREFIX} ..
+
+    - name: Configure [Conda/Windows]
+      if: contains(matrix.os, 'windows')
+      shell: bash -l {0}
+      run: |
+        mkdir build
+        cd build
+        cmake -G"Visual Studio 16 2019" -DCMAKE_INSTALL_PREFIX=${CONDA_PREFIX}/Library -DCMAKE_BUILD_TYPE=${{ matrix.build_type }} ..
+
+    - name: Build [Conda]
+      shell: bash -l {0}
+      run: |
+        cd build
+        cmake --build . --config ${{ matrix.build_type }}
+
+  build-with-system-dependencies:
+    name: '[${{ matrix.os }}@${{ matrix.build_type }}]'
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        build_type: [Release]
+        os: [ubuntu-18.04, ubuntu-20.04, macOS-10.15]
+
+    steps:
+    - uses: actions/checkout@master
+
+    # Print environment variables to simplify development and debugging
+    - name: Environment Variables
+      shell: bash
+      run: env
+
+    # ============
+    # DEPENDENCIES
+    # ============
+
+    - name: Dependencies [macOS]
+      run: |
+        brew install cmake
+
+    # ===================
+    # CMAKE-BASED PROJECT
+    # ===================
+
+    - name: Configure [Ubuntu/macOS]
+      shell: bash
+      run: |
+        mkdir -p build
+        cd build
+        cmake -DCMAKE_INSTALL_PREFIX=${GITHUB_WORKSPACE}/install ..
+        
+    - name: Build
+      shell: bash
+      run: |
+        cd build
+        cmake --build . --config ${{ matrix.build_type }}
+

cpp/CMakeLists.txt

@@ -27,6 +27,8 @@ set_target_properties(${LIBRARY_TARGET_NAME} PROPERTIES VERSION       ${${PROJEC
 
 target_include_directories(${LIBRARY_TARGET_NAME} PUBLIC "$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>"
                                                          "$<INSTALL_INTERFACE:$<INSTALL_PREFIX>/${CMAKE_INSTALL_INCLUDEDIR}>")
+
+target_compile_features(${LIBRARY_TARGET_NAME} PUBLIC cxx_std_11)
 
 install(TARGETS ${LIBRARY_TARGET_NAME}
         EXPORT  ${PROJECT_NAME}