How to make clangd provide intelligence for .cu files

[shadow150519]

I have a very strange problem for my clangd. It can provide intellgence for my cpp files correctly, but when it comes to .cu files, it don't work. Here's my situation.I've add the torch lib in my project. when I include <torch/library.h>. clangd works correctly. However, when I include <torch/library.h> in a .cu file. clangd doesn't seem to be working. But when I rename the .cu file to .cpp file. It works again. The three files are in the same directory. I can make sure there is no problem with my cmake configuration.

Logs when I hover on the #include<torch/library.h> in the .cu file

V[15:53:33.482] <<< {
  "id": 73,
  "jsonrpc": "2.0",
  "method": "textDocument/hover",
  "params": {
    "position": {
      "character": 24,
      "line": 8
    },
    "textDocument": {
      "uri": "file:///home/wtx/workspace/cpp_project/uvm/memory_utils/memory_utils_ops.cu"
    }
  }
}

I[15:53:33.482] <-- textDocument/hover(73)
V[15:53:33.483] ASTWorker running Hover on version 5 of /home/wtx/workspace/cpp_project/uvm/memory_utils/memory_utils_ops.cu
I[15:53:33.483] --> reply:textDocument/hover(73) 0 ms
V[15:53:33.483] >>> {
  "id": 73,
  "jsonrpc": "2.0",
  "result": null
}

I[15:53:33.483] --> textDocument/clangd.fileStatus
V[15:53:33.483] >>> {
  "jsonrpc": "2.0",
  "method": "textDocument/clangd.fileStatus",
  "params": {
    "state": "idle",
    "uri": "file:///home/wtx/workspace/cpp_project/uvm/memory_utils/memory_utils_ops.cu"
  }
}

V[15:53:33.642] <<< {
  "id": 74,
  "jsonrpc": "2.0",
  "method": "textDocument/codeAction",
  "params": {
    "context": {
      "diagnostics": [
        {
          "code": "pp_file_not_found",
          "message": "'torch/library.h' file not found",
          "range": {
            "end": {
              "character": 26,
              "line": 8
            },
            "start": {
              "character": 9,
              "line": 8
            }
          },
          "relatedInformation": [],
          "severity": 1,
          "source": "clang"
        }
      ],
      "only": [
        "quickfix"
      ],
      "triggerKind": 1
    },
    "range": {
      "end": {
        "character": 26,
        "line": 8
      },
      "start": {
        "character": 9,
        "line": 8
      }
    },
    "textDocument": {
      "uri": "file:///home/wtx/workspace/cpp_project/uvm/memory_utils/memory_utils_ops.cu"
    }
  }
}

I[15:53:33.643] <-- textDocument/codeAction(74)
V[15:53:33.643] ASTWorker running EnumerateTweaks on version 5 of /home/wtx/workspace/cpp_project/uvm/memory_utils/memory_utils_ops.cu
I[15:53:33.643] --> reply:textDocument/codeAction(74) 0 ms
V[15:53:33.643] >>> {
  "id": 74,
  "jsonrpc": "2.0",
  "result": []
}

I[15:53:33.643] --> textDocument/clangd.fileStatus
V[15:53:33.643] >>> {
  "jsonrpc": "2.0",
  "method": "textDocument/clangd.fileStatus",
  "params": {
    "state": "idle",
    "uri": "file:///home/wtx/workspace/cpp_project/uvm/memory_utils/memory_utils_ops.cu"
  }
}

when I hover on the #include<torch/library.h> in the .cpp file

V[15:54:34.829] <<< {
  "id": 81,
  "jsonrpc": "2.0",
  "method": "textDocument/hover",
  "params": {
    "position": {
      "character": 24,
      "line": 9
    },
    "textDocument": {
      "uri": "file:///home/wtx/workspace/cpp_project/uvm/memory_utils/memory_utils_ops_gpu.cpp"
    }
  }
}

I[15:54:34.829] <-- textDocument/hover(81)
V[15:54:34.829] ASTWorker running Hover on version 1 of /home/wtx/workspace/cpp_project/uvm/memory_utils/memory_utils_ops_gpu.cpp
I[15:54:34.830] --> reply:textDocument/hover(81) 0 ms
V[15:54:34.830] >>> {
  "id": 81,
  "jsonrpc": "2.0",
  "result": {
    "contents": {
      "kind": "markdown",
      "value": "### `library.h`  \n\n---\n```\n/home/wtx/miniconda3/envs/dgl/lib/python3.10/site-packages/torch/include/torch/library.h\n```"
    }
  }
}

I[15:54:34.830] --> textDocument/clangd.fileStatus
V[15:54:34.830] >>> {
  "jsonrpc": "2.0",
  "method": "textDocument/clangd.fileStatus",
  "params": {
    "state": "idle",
    "uri": "file:///home/wtx/workspace/cpp_project/uvm/memory_utils/memory_utils_ops_gpu.cpp"
  }
}

System information Clangd version (from the log, or clangd --version):

clangd version 15.0.6
Features: linux
Platform: x86_64-unknown-linux-gnu

clangd extension version: v0.1.25 Operating system: Ubuntu 20.04.5 LTS