Add Github Actions.

.github/workflows/ci.yml

@@ -0,0 +1,55 @@
+name: CI
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    name: ${{ matrix.platform.name }} ${{ matrix.config.name }}
+    runs-on: ${{ matrix.platform.os }}
+
+    strategy:
+      matrix:
+        platform:
+        - { name: Windows VS2017, os: windows-2016   }
+        - { name: Windows VS2019, os: windows-latest }
+        - { name: Linux GCC,      os: ubuntu-latest  }
+        - { name: Linux Clang,    os: ubuntu-latest, flags: -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ }
+        - { name: MacOS XCode,    os: macos-latest   }
+        config:
+        - { name: Shared, flags: -DBUILD_SHARED_LIBS=TRUE }
+        - { name: Static, flags: -DBUILD_SHARED_LIBS=FALSE }
+
+        include:
+        - platform: { name: MacOS XCode, os: macos-latest }
+          config: { name: Frameworks, flags: -DSFML_BUILD_FRAMEWORKS=TRUE }
+        - platform: { name: MacOS XCode, os: macos-latest }
+          config: { name: iOS, flags: -DCMAKE_TOOLCHAIN_FILE=$GITHUB_WORKSPACE/cmake/toolchains/iOS.toolchain.cmake -DIOS_PLATFORM=SIMULATOR }
+        - platform: { name: Android, os: ubuntu-latest }
+          config: { name: x86, flags: -DCMAKE_ANDROID_ARCH_ABI=x86 -DCMAKE_SYSTEM_NAME=Android -DSFML_BUILD_TEST_SUITE=FALSE -DCMAKE_ANDROID_NDK=$GITHUB_WORKSPACE/android-ndk-r18b -DCMAKE_ANDROID_NDK_TOOLCHAIN_VERSION=clang -DCMAKE_ANDROID_STL_TYPE=c++_shared -DCMAKE_ANDROID_API=26 }
+        - platform: { name: Android, os: ubuntu-latest }
+          config: { name: armeabi-v7a, flags: -DCMAKE_ANDROID_ARCH_ABI=armeabi-v7a -DCMAKE_SYSTEM_NAME=Android -DSFML_BUILD_TEST_SUITE=FALSE -DCMAKE_ANDROID_NDK=$GITHUB_WORKSPACE/android-ndk-r18b -DCMAKE_ANDROID_NDK_TOOLCHAIN_VERSION=clang -DCMAKE_ANDROID_STL_TYPE=c++_shared -DCMAKE_ANDROID_API=26 }
+    steps:
+    - name: Checkout Code
+      uses: actions/checkout@v2
+
+    - name: Install Linux Dependencies
+      if: runner.os == 'Linux'
+      run: sudo apt-get install libxrandr-dev libxcursor-dev libudev-dev libopenal-dev libflac-dev libvorbis-dev libgl1-mesa-dev libegl1-mesa-dev
+
+
+    - name: Install Android Components
+      if: matrix.platform.name == 'Android'
+      run: |
+        echo "y" | /usr/local/lib/android/sdk/tools/bin/sdkmanager --install "cmake;3.10.2.4988404" --sdk_root=ANDROID_SDK_ROOT
+        sudo ln -sf /usr/local/lib/android/sdk/cmake/3.10.2.4988404/bin/cmake /usr/bin/cmake
+        wget -nv https://dl.google.com/android/repository/android-ndk-r18b-linux-x86_64.zip -P $GITHUB_WORKSPACE
+        unzip -qq -d $GITHUB_WORKSPACE android-ndk-r18b-linux-x86_64.zip 
+
+
+    - name: Configure CMake
+      shell: bash
+      run: cmake -S $GITHUB_WORKSPACE -B $GITHUB_WORKSPACE/build -DCMAKE_INSTALL_PREFIX=$GITHUB_WORKSPACE/install -DSFML_BUILD_EXAMPLES=TRUE -DCMAKE_VERBOSE_MAKEFILE=ON -DSFML_BUILD_TEST_SUITE=TRUE ${{matrix.platform.flags}} ${{matrix.config.flags}}
+
+    - name: Build
+      shell: bash
+      run: cmake --build $GITHUB_WORKSPACE/build --config Release --target install