Add Intel oneAPI setup for OpenMP in GitHub Actions

Integrated Intel oneAPI into the workflow to enable OpenMP support for the project. Updated CMake configuration to include necessary OpenMP flags and library paths. This ensures compatibility with Intel's OpenMP runtime for improved parallelization.

Author: allnes

.github/workflows/main.yml

@@ -812,23 +812,32 @@ jobs:
         uses: seanmiddleditch/gha-setup-ninja@v6
       - name: Setup MSVC for Ninja again
         uses: ilammy/msvc-dev-cmd@v1
+
+      - name: Setup Intel oneAPI (for OpenMP)
+        uses: rscohn2/setup-oneapi@v1
+        with:
+          components: compiler  # includes Intel OpenMP runtime
       - name: CMake configure
         run: >
-          cmake -S . -B build -G Ninja -D CMAKE_C_COMPILER=clang-cl -DCMAKE_CXX_COMPILER=clang-cl
+          cmake -S . -B build -G Ninja
+          -D CMAKE_C_COMPILER=clang-cl -D CMAKE_CXX_COMPILER=clang-cl
           -D CMAKE_C_COMPILER_LAUNCHER=ccache -D CMAKE_CXX_COMPILER_LAUNCHER=ccache
-          -D CMAKE_BUILD_TYPE=RELEASE -DCMAKE_INSTALL_PREFIX=install
+          -D CMAKE_BUILD_TYPE=Release -D CMAKE_INSTALL_PREFIX=install
+          -D OpenMP_C_FLAGS="/clang:-fopenmp=libiomp5"
+          -D OpenMP_CXX_FLAGS="/clang:-fopenmp=libiomp5"
+          -D OpenMP_C_LIB_NAMES="iomp5"
+          -D OpenMP_CXX_LIB_NAMES="iomp5"
+          -D OpenMP_iomp5_LIBRARY="${ONEAPI_ROOT}/compiler/latest/windows/redist/intel64_win/compiler/libiomp5md.lib"
         env:
           CC: clang-cl
           CXX: clang-cl
       - name: Build project
-        run: |
-          cmake --build build --config Release --parallel
+        run: cmake --build build --config Release --parallel
         env:
           CC: clang-cl
           CXX: clang-cl
       - name: Install project
-        run: |
-          cmake --install build
+        run: cmake --install build
       - name: Archive installed package
         run: Compress-Archive -Path install -DestinationPath windows-clang-install.zip
         shell: pwsh