Add CI for clang-cl (#105)

add GitHub actions to compile with LLVM on Windows (clang-cl) and provide the resulting artifact

.appveyor.yml

@@ -29,7 +29,7 @@ init:
 
 before_build:
   - set VSVERSIONSHORT=%VSVERSION:~3,4%
-  - if "%APPVEYOR_REPO_TAG_NAME%"=="" ( set "APPVEYOR_REPO_TAG_NAME=dev-vs%VSVERSIONSHORT%-%platform%-%configuration%" )
+  - if "%APPVEYOR_REPO_TAG_NAME%"=="" ( set "APPVEYOR_REPO_TAG_NAME=dev-vs-%VSVERSIONSHORT%-%platform%-%configuration%" )
   - mkdir build
   - cd build
   - cmake -G "Visual Studio %VSVERSION%" -DCPACK_PACKAGE_VERSION="%APPVEYOR_REPO_TAG_NAME%" %CMAKE_OPTIONS% ..

.github/workflows/os_windows.yaml

@@ -0,0 +1,61 @@
+name: Windows Build with open source compilers
+
+on: [push, pull_request]
+
+jobs:
+  Windows:
+    runs-on: windows-latest
+
+    strategy:
+      matrix:
+        compiler: [clang-cl]
+        build_type: [Release, Debug]
+      fail-fast: false
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v6
+
+    - name: "Clang-cl: Define compiler version"
+      if: matrix.compiler == 'clang-cl'
+      run: |
+        $env:COMPILER_VERSION = "21"
+        Add-Content -Path $env:GITHUB_ENV -Value "COMPILER_VERSION=$env:COMPILER_VERSION"
+
+    - name: "Define package name"
+      run: |
+        $env:VERSION = if ($env:GITHUB_REF -and $env:GITHUB_REF -match "^refs/tags/(?<tag>.+)$") { $matches["tag"] } else { "dev" }
+        $env:PACKAGE_VERSION = "$env:VERSION-${{ matrix.compiler }}-$env:COMPILER_VERSION-x64-${{ matrix.build_type }}"
+        Add-Content -Path $env:GITHUB_ENV -Value "PACKAGE_VERSION=$env:PACKAGE_VERSION"
+
+    - name: "Clang-cl: Set up LLVM"
+      if: matrix.compiler == 'clang-cl'
+      uses: KyleMayes/install-llvm-action@98e68e10c96dffcb7bfed8b2144541a66b49aa02 # v2.0.8
+      with:
+        version: ${{ env.COMPILER_VERSION }}
+
+    - name: Install Ninja
+      run: choco install ninja
+    
+    - name: Output environment information
+      run: |
+        cmake --version
+        ninja --version
+        ${{ matrix.compiler }} --version
+
+    - name: "Configure CMake"
+      if: matrix.compiler == 'clang-cl'
+      run: | 
+        cmake -S . -B build -G "Ninja" -DCMAKE_C_COMPILER=${{ matrix.compiler }} -DCMAKE_BUILD_TYPE=${{ matrix.build_type }} -DCPACK_PACKAGE_VERSION="$env:PACKAGE_VERSION" -DUSE_STATIC_RUNTIME=ON
+
+    - name: Build with CMake
+      run: cmake --build build --config "${{ matrix.build_type }}"
+
+    - name: Create package
+      run: cmake --build build --target package
+
+    - name: Upload artifacts
+      uses: actions/upload-artifact@v7
+      with:
+        name: ${{ env.PACKAGE_VERSION }}
+        path: build/win_flex_bison*.zip