Add support for CUDA

.github/workflows/cmake.yml

@@ -12,10 +12,13 @@ jobs:
       matrix:
         compiler: [g++, clang++]
         kokkos: [on, off]
+        cuda: [on, off]
         mempool: [on, off]
         exclude:
         - kokkos: off
           mempool: on
+        - cuda: off
+          mempool: on
 
     steps:
     - uses: actions/checkout@v4
@@ -28,6 +31,9 @@ jobs:
         repository: kokkos/kokkos
         path: kokkos
 
+    - uses: Jimver/[email protected]
+      if: ${{ matrix.cuda == 'on' }}
+
     - name: Configure Kokkos
       if: ${{ matrix.kokkos == 'on' }}
       shell: bash
@@ -36,6 +42,7 @@ jobs:
            -Bbuild
            -DCMAKE_CXX_COMPILER=${{ matrix.compiler }}
            -DCMAKE_INSTALL_PREFIX=build/install
+           -DKokkos_ENABLE_CUDA=${{ matrix.cuda }}
 
     - name: Build Kokkos
       if: ${{ matrix.kokkos == 'on' }}
@@ -50,7 +57,7 @@ jobs:
            -DCMAKE_CXX_COMPILER=${{ matrix.compiler }}
            -DCMAKE_VERBOSE_MAKEFILE=on
            -DOmega_h_USE_MPI=off
-           -DOmega_h_USE_CUDA=off
+           -DOmega_h_USE_CUDA=${{ matrix.kokkos == 'off' && matrix.cuda || 'off' }}
            -DOmega_h_USE_Kokkos=${{ matrix.kokkos }}
            -DKokkos_PREFIX=$GITHUB_WORKSPACE/kokkos/build/install
            -DBUILD_TESTING=ON
@@ -63,6 +70,7 @@ jobs:
       run: cmake --build .
 
     - name: Test
+      if: ${{ matrix.cuda == 'off' }}
       working-directory: ${{github.workspace}}/omega_h/build
       shell: bash
       run: ctest