Applying naming feedback, adding comments and expanding target platforms

ci/cmake.yml

@@ -2,21 +2,45 @@ name: CMake CI
 
 on: [push]
 
+env:
+  # Customize the CMake build type here (Release, Debug, RelWithDebInfo, etc.)
+  BUILD_TYPE: Release
+
 jobs:
   build:
 
-    runs-on: ubuntu-latest
-    
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [windows-latest, ubuntu-latest, macOS-latest]
+
     steps:
     - uses: actions/checkout@v1
-    - name: create-build-dir
+
+    - 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: cmake -E make_directory ${{runner.workspace}}/build
-    - name: cmake-configure
+
+    - 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
-      run: cmake $GITHUB_WORKSPACE
-    - name: build
+      # 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
       working-directory: ${{runner.workspace}}/build
-      run: cmake --build . --config Release
-    - name: test
+      shell: bash
+      # Execute the build.  You can specify a specific target with "--target <NAME>"
+      run: cmake --build . --config $BUILD_TYPE
+
+    - name: Test
       working-directory: ${{runner.workspace}}/build
-      run: ctest -C Release
+      shell: bash
+      # Execute tests defined by the CMake configuration.  
+      # See https://cmake.org/cmake/help/latest/manual/ctest.1.html for more detail
+      run: ctest -C $BUILD_TYPE