Add GitHub Actions script.

.github/workflows/main.yml

@@ -0,0 +1,54 @@
+name: CI
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ opened, synchronize, reopened ]
+
+jobs:
+  build:
+    name: "Build ${{ matrix.platform }}"
+    strategy:
+      matrix:
+        platform: [windows-latest, ubuntu-16.04, ubuntu-18.04, ubuntu-20.04, macos-latest]
+    env:
+      PARALLEL: -j 2
+
+    runs-on: "${{ matrix.platform }}"
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: actions/setup-python@v2
+        with:
+          python-version: '3.x'
+
+      - name: Pull glslang / SPIRV-Tools
+        shell: bash
+        working-directory: ${{github.workspace}}
+        run: ./checkout_glslang_spirv_tools.sh
+
+      - name: Build glslang / SPIRV-Tools
+        shell: bash
+        working-directory: ${{github.workspace}}
+        run: ./build_glslang_spirv_tools.sh Release
+
+      - name: Configure SPIRV-Cross
+        shell: bash
+        run: |
+          mkdir build
+          cd build
+          cmake .. -DSPIRV_CROSS_WERROR=ON -DSPIRV_CROSS_MISC_WARNINGS=ON -DSPIRV_CROSS_SHARED=ON -DCMAKE_INSTALL_PREFIX=output -DCMAKE_BUILD_TYPE=Release -DSPIRV_CROSS_ENABLE_TESTS=ON
+
+      - name: Build SPIRV-Cross
+        shell: bash
+        working-directory: ${{github.workspace}}/build
+        run: |
+          cmake --build . --config Release
+          cmake --build . --config Release --target install
+
+      - name: Test SPIRV-Cross
+        shell: bash
+        working-directory: ${{github.workspace}}/build
+        run: ctest --verbose -C Release
+

test_shaders.py

@@ -100,10 +100,11 @@ def get_shader_stats(shader):
 def print_msl_compiler_version():
     try:
         subprocess.check_call(['xcrun', '--sdk', 'iphoneos', 'metal', '--version'])
-        print('...are the Metal compiler characteristics.\n')   # display after so xcrun FNF is silent
+        print('... are the Metal compiler characteristics.\n')   # display after so xcrun FNF is silent
     except OSError as e:
         if (e.errno != errno.ENOENT):    # Ignore xcrun not found error
             raise
+        print('Metal SDK is not present.\n')
     except subprocess.CalledProcessError:
         pass