Enable Windows CUDA CI

.github/workflows/cuda.yml

@@ -22,31 +22,72 @@ env:
 
 jobs:
   Build:
-    name: CUDA (${{ matrix.config }})
-    runs-on: ubuntu-latest
+    name: ${{ matrix.name }} CUDA (${{ matrix.config }})
+    runs-on: ${{ matrix.os }}
     strategy:
       fail-fast: false
       matrix:
+        os: [ubuntu-latest, windows-latest]
         config:
           - Debug
-          - Release
+          # - Release # cannot run multiple cuda-toolkit jobs in parallel
+        include:
+          - os: ubuntu-latest
+            name: Linux
+            cuda_subpackages: '["nvcc"]'
+          - os: windows-latest
+            name: Windows
+            # Windows splits the toolkit into finer components than Linux and an
+            # invalid component name aborts the whole install, so name exactly
+            # what the build needs (per the Windows installer subpackage list):
+            #   nvcc   - compiler front-end (nvcc, cudafe++, ptxas, nvlink)
+            #   nvvm   - device compiler backend (cicc); nvcc alone omits it
+            #   cudart - cuda_runtime.h + runtime library
+            #   crt    - crt/host_config.h
+            #   thrust - Thrust, and the CUB/libcudacxx headers it bundles
+            # ("cccl"/"cub" are not valid Windows installer subpackage names.)
+            cuda_subpackages: '["nvcc", "nvvm", "cudart", "crt", "thrust"]'
     steps:
       - name: Checkout repository
         uses: actions/checkout@v6
         with:
           fetch-depth: 10
 
-      - name: Dependencies
+      - name: Dependencies (Linux)
+        if: runner.os == 'Linux'
         run: |
           sudo apt-get install ccache
           echo 'CACHE_PATH=~/.cache/ccache' >> "$GITHUB_ENV"
 
-      - name: cuda-toolkit
-        uses: Jimver/cuda-toolkit@v0.2.30
+      - name: Dependencies (Windows)
+        if: runner.os == 'Windows'
+        run: |
+          choco install ccache
+          "CACHE_PATH=${env:LOCALAPPDATA}\ccache" | Out-File -FilePath $env:GITHUB_ENV -Append
+
+      - name: Install Ninja
+        if: runner.os == 'Windows'
+        uses: seanmiddleditch/gha-setup-ninja@master
+
+      # Install CUDA before msvc-dev-cmd so the toolkit's bin dir lands on PATH
+      # before msvc-dev-cmd snapshots PATH into GITHUB_ENV for later steps.
+      # (check_language(CUDA) still does not reliably autodetect nvcc on this
+      # runner even with it on PATH, so the Windows configure also passes
+      # -DCMAKE_CUDA_COMPILER explicitly.)
+      - name: Install CUDA Toolkit
+        uses: Jimver/cuda-toolkit@v0.2.35
+        id: cuda-toolkit
         with:
-          sub-packages: '["nvcc"]'
+          cuda: '13.2.0'
+          sub-packages: ${{ matrix.cuda_subpackages }}
           method: 'network'
 
+      - name: Setup MSVC (Windows)
+        if: runner.os == 'Windows'
+        uses: ilammy/msvc-dev-cmd@v1
+        with:
+          arch: x64
+
       - name: Get number of CPU cores
         uses: SimenB/github-actions-cpu-cores@v2
         id: cpu-cores
@@ -56,15 +97,16 @@ jobs:
         uses: actions/cache@v5
         with:
           path: ${{ env.CACHE_PATH }}
-          key: ${{ runner.os }}-${{ matrix.config }}-cache
+          key: ${{ runner.os }}-${{ matrix.config }}-CUDA-cache
 
       - name: Prepare ccache
         run: |
           ccache --max-size=1.0G
           ccache -V && ccache --show-config
           ccache --show-stats && ccache --zero-stats
 
-      - name: Configure
+      - name: Configure (Linux)
+        if: runner.os == 'Linux'
         run: |
           mkdir -p build
           cd build
@@ -76,6 +118,21 @@ jobs:
             -DIPC_TOOLKIT_BUILD_PYTHON=ON \
             -DCMAKE_BUILD_TYPE=${{ matrix.config }}
 
+      - name: Configure (Windows)
+        if: runner.os == 'Windows'
+        shell: cmd
+        run: |
+          cmake -G Ninja ^
+            -DIPC_TOOLKIT_WITH_CUDA=ON ^
+            -DCMAKE_CUDA_ARCHITECTURES=75 ^
+            -DSCALABLE_CCD_CUDA_ARCHITECTURES=75 ^
+            -DIPC_TOOLKIT_BUILD_TESTS=ON ^
+            -DIPC_TOOLKIT_BUILD_PYTHON=ON ^
+            -DCMAKE_CUDA_COMPILER="%CUDA_PATH%\bin\nvcc.exe" ^
+            -DCMAKE_BUILD_TYPE=${{ matrix.config }} ^
+            -B build ^
+            -S .
+
       - name: Build
         run: |
           cmake --build build -j ${{ steps.cpu-cores.outputs.count }}

CMakeLists.txt

@@ -207,8 +207,8 @@ add_subdirectory("${IPC_TOOLKIT_SOURCE_DIR}")
 
 # Public include directory for IPC Toolkit
 target_include_directories(ipc_toolkit PUBLIC
-  "${IPC_TOOLKIT_INCLUDE_DIR}"    # public headers
-  "${PROJECT_BINARY_DIR}/include" # generated config.hpp
+  "${IPC_TOOLKIT_INCLUDE_DIR}"                     # public headers
+  $<BUILD_INTERFACE:${PROJECT_BINARY_DIR}/include> # generated config.hpp
 )
 
 # Folder name for IDE