Add 'device' subdir for SOM and future work

Author: sethrj

src/accel/SetupOptionsMessenger.cc

@@ -204,23 +204,36 @@ SetupOptionsMessenger::SetupOptionsMessenger(SetupOptions* options)
             "enabled",
             "Call back to Geant4 sensitive detectors");
 
-    if (CELERITAS_USE_CUDA)
-    {
-        directories_.emplace_back(new CelerDirectory(
-            "/celer/cuda/", "Celeritas CUDA setup options"));
-        add_cmd(&options->cuda_stack_size,
-                "stackSize",
-                "Set the CUDA per-thread stack size for VecGeom");
-        add_cmd(&options->cuda_heap_size,
-                "heapSize",
-                "Set the CUDA per-thread heap size for VecGeom");
-        add_cmd(&options->action_times,
-                "actionTimes",
-                "Add timers around every action (may reduce performance)");
-        add_cmd(&options->default_stream,
-                "defaultStream",
-                "Launch all kernels on the default stream (REMOVED)");
-    }
+    // TODO: add enabled flag: CELERITAS_USE_CUDA
+    directories_.emplace_back(new CelerDirectory(
+        "/celer/cuda/",
+        R"(Celeritas CUDA setup options (DEPRECATED: moved to /celer/device)"));
+    add_cmd(&options->cuda_stack_size,
+            "stackSize",
+            "Set the CUDA per-thread stack size for VecGeom");
+    add_cmd(&options->cuda_heap_size,
+            "heapSize",
+            "Set the CUDA per-thread heap size for VecGeom");
+    add_cmd(&options->action_times,
+            "actionTimes",
+            "Add timers around every action (may reduce performance)");
+    add_cmd(&options->default_stream,
+            "defaultStream",
+            "Launch all kernels on the default stream (REMOVED)");
+
+    // TODO: add enabled flag: CELERITAS_USE_CUDA|| CELERITAS_USE_HIP
+    directories_.emplace_back(
+        new CelerDirectory("/celer/device/", "Celeritas device setup"));
+    // TODO: add enabled flag: CELERITAS_CORE_GEO == CELERITAS_CORE_GEO_VECGEOM
+    add_cmd(&options->cuda_stack_size,
+            "stackSize",
+            "Set the CUDA per-thread stack size for VecGeom");
+    add_cmd(&options->cuda_heap_size,
+            "heapSize",
+            "Set the CUDA per-thread heap size for VecGeom");
+    add_cmd(&options->action_times,
+            "actionTimes",
+            "Add timers around every action (may reduce performance)");
 
     add_cmd(&options->slot_diagnostic_prefix,
             "slotDiagnosticPrefix",