Add Windows 2025 VS 2026 clang-cl CI

Author: Lior Lahav

.github/workflows/cmake-multi-platform.yml

@@ -78,3 +78,43 @@ jobs:
       # See https://cmake.org/cmake/help/latest/manual/ctest.1.html for more detail
       # run: ctest --build-config ${{ matrix.build_type }}
       run: echo "Tests are skipped"
+
+  build-windows2025-vs2026:
+    runs-on: windows-2025-vs2026
+
+    steps:
+    - uses: actions/checkout@v6
+
+    - name: Setup MSVC environment
+      uses: ilammy/msvc-dev-cmd@v1
+      with:
+        arch: x64
+
+    - name: Set reusable strings
+      id: strings
+      shell: bash
+      run: |
+        echo "build-output-dir=${{ github.workspace }}/build-windows2025-vs2026" >> "$GITHUB_OUTPUT"
+
+    - name: Setup CMake
+      uses: lukka/get-cmake@latest
+      with:
+        cmakeVersion: "~4.2.0"  # use most recent 4.2.x version
+
+    - name: Configure CMake
+      run: >
+        cmake -B ${{ steps.strings.outputs.build-output-dir }}
+        -G Ninja
+        -S ${{ github.workspace }}
+        -DCMAKE_C_COMPILER=clang-cl
+        -DCMAKE_CXX_COMPILER=clang-cl
+        -DCMAKE_BUILD_TYPE=Release
+        -DFREEIMAGE_WITH_LIBHEIF:BOOL=OFF
+        -DFREEIMAGE_BUILD_TESTS:BOOL=ON
+
+    - name: Build
+      run: cmake --build ${{ steps.strings.outputs.build-output-dir }} --config Release
+
+    - name: Test
+      working-directory: ${{ steps.strings.outputs.build-output-dir }}
+      run: echo "Tests are skipped"