Build test with github actions

.github/workflows/cmake.yml

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+name: CMake
+
+on: [push]
+
+env:
+  # Customize the CMake build type here (Release, Debug, RelWithDebInfo, etc.)
+  BUILD_TYPE: Release
+
+jobs:
+  build:
+    # The CMake configure and build commands are platform agnostic and should work equally
+    # well on Windows or Mac.  You can convert this to a matrix build if you need
+    # cross-platform coverage.
+    # See: https://docs.github.com/en/free-pro-team@latest/actions/learn-github-actions/managing-complex-workflows#using-a-build-matrix
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+      
+    - name: Install dependencies
+      run: sudo apt install libglu1-mesa-dev pkg-config
+
+    - name: Create Build Environment
+      # Some projects don't allow in-source building, so create a separate build directory
+      # We'll use this as our working directory for all subsequent commands
+      run: |
+        mkdir ${{runner.workspace}}/build_test
+        mkdir ${{runner.workspace}}/from_installed
+        mkdir ${{runner.workspace}}/pkg-config
+        mkdir ${{runner.workspace}}/as_subdirectory
+
+    - name: Configure CMake
+      # Use a bash shell so we can use the same syntax for environment variable
+      # access regardless of the host operating system
+      shell: bash
+      working-directory: ${{runner.workspace}}/build_test
+      # Note the current convention is to use the -S and -B options here to specify source 
+      # and build directories, but this is only available with CMake 3.13 and higher.  
+      # The CMake binaries on the Github Actions machines are (as of this writing) 3.12
+      run: cmake $GITHUB_WORKSPACE -DCMAKE_BUILD_TYPE=$BUILD_TYPE
+
+    - name: Build test
+      working-directory: ${{runner.workspace}}/build_test
+      shell: bash
+      # Execute the build.  You can specify a specific target with "--target <NAME>"
+      run: cmake --build . --config $BUILD_TYPE
+
+    - name: Install test
+      shell: bash
+      working-directory: ${{runner.workspace}}/from_installed
+      run: |
+        mkdir -p ext_project/build
+        cp $GITHUB_WORKSPACE/src/glewinfo.c ext_project/
+        cmake $GITHUB_WORKSPACE -DCMAKE_INSTALL_PREFIX=$GITHUB_WORKSPACE/glew-root-cmake
+        cmake --build . --target install
+        
+        cd ext_project
+        cp $GITHUB_WORKSPACE/glew-cmake/cmake-install-test.cmake CMakeLists.txt
+        cmake -DCMAKE_PREFIX_PATH=$GITHUB_WORKSPACE/glew-root-cmake/ .
+        cmake --build .
+
+    - name: Package config test
+      shell: bash
+      working-directory: ${{runner.workspace}}/pkg-config
+      run: |
+        mkdir -p ext_project
+        cp $GITHUB_WORKSPACE/src/glewinfo.c ext_project/
+        cmake $GITHUB_WORKSPACE -DPKG_CONFIG_REPRESENTATIVE_TARGET=libglew_static -DCMAKE_INSTALL_PREFIX=$GITHUB_WORKSPACE/glew-root-pkg-config
+        cmake --build . --target install
+        
+        cd ext_project
+        gcc $GITHUB_WORKSPACE/src/glewinfo.c $(PKG_CONFIG_PATH=$GITHUB_WORKSPACE/glew-root-pkg-config/lib/pkgconfig pkg-config --libs --cflags glew) -o glewinfo
+
+    - name: Subdirectory test
+      shell: bash
+      working-directory: ${{runner.workspace}}/as_subdirectory
+      run: |
+        cp $GITHUB_WORKSPACE/src/glewinfo.c ./
+        cp $GITHUB_WORKSPACE/glew-cmake/sub-directory-test.cmake CMakeLists.txt
+        cmake .
+        cmake --build .
+        

glew-cmake/cmake-install-test.cmake

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+cmake_minimum_required(VERSION 2.8.12)
+project(cmake_install_test)
+
+# Dependencies of glew.
+# These are referenced in glewConfig.cmake. but, not automatically found.
+find_package(OpenGL REQUIRED)
+find_package(X11 REQUIRED)
+
+find_package(glew)
+add_executable(glewinfo glewinfo.c)
+target_link_libraries(glewinfo PRIVATE libglew_static)

glew-cmake/sub-directory-test.cmake

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+cmake_minimum_required(VERSION 2.8.12)
+project(sub_test)
+
+add_subdirectory($ENV{GITHUB_WORKSPACE}/ glew_sub)
+add_executable(glewinfo glewinfo.c)
+target_link_libraries(glewinfo PRIVATE libglew_static)