Overriding `"command_parameters"` in LSP Client not work as expected

[Old-Rockin-Chair-Joe]

I need to add --query-driver.

In your default lspclient.json:

    {
      "language": "c",
      "name": "clangd",
      "url": "https://clangd.llvm.org/",
      "command": "clangd",
      "command_parameters": "-log=error --background-index --header-insertion=never --limit-results=0 --limit-references=0 --clang-tidy=0 --completion-style=bundled -j $NPROC",
      "share_process": true,
      "file_patterns": ["%.c$", "%.h$", "%.C$", "%.H$", "%.objc$"]
    },
    {
      "language": "cpp",
      "use": "clangd",
      "share_process": true,
      "file_patterns": ["%.inl$", "%.cpp$", "%.hpp$", "%.cc$", "%.cxx$", "%.c++$", "%.hh$", "%.hxx$", "%.h++$", "%.objcpp$"]
    },
    {
      "language": "objective-c",
      "use": "clangd",
      "share_process": true,
      "file_patterns": ["%.m$"]
    },
    {
      "language": "objective-cpp",
      "use": "clangd",
      "share_process": true,
      "file_patterns": ["%.mm$"]
    },

OK. So C++ just reuse the template for C.

I don't want to mess with the template for C, so I tried this in my local lspclient.json:

  "servers": [
    {
      "command_parameters": "-log=error --background-index --query-driver=D:\\Tools\\c++.exe --header-insertion=never --limit-results=0 --limit-references=0 --clang-tidy=0 --completion-style=bundled -j $NPROC",
      "language" : "cpp"
    }
  ]

That doesn't work.

So I have no way other than overriding the template for C itself:

  "servers": [
    {
      "command_parameters": "-log=error --background-index --query-driver=D:\\Tools\\c++.exe --header-insertion=never --limit-results=0 --limit-references=0 --clang-tidy=0 --completion-style=bundled -j $NPROC",
      "name": "clangd"
    }
  ]

Nope. Also doesn't work.

It took me a while to figure out that the override itself doesn’t work, and that the issue isn’t with clangd, by checking the internal console with F12. The language server is still launched with the default "command_parameters".

[SpartanJ]

Yeah, it's too confusing for that particular case, it's possible to configure it but you need to redefine all the settings, the reason this happens is because clangd share the process between different languages and it ends up always using the original definition due to the fact that you need to reset those settings too. BTW not sharing the process will spawn 2 clangd, one for each language, which I strongly do not recommend. If you want to share the process, you would need to modify the "root" rule, in this case C.
The last configuration you tried it will work now (it will replace the "root" configuration), but you can now also override by "language" which was not allowed until now. But you need to disable "share_process" too if you want to separate the configurations.

I mean:

  "servers": [
    {
      "command_parameters": "-log=error --background-index --query-driver=D:\\Tools\\c++.exe --header-insertion=never --limit-results=0 --limit-references=0 --clang-tidy=0 --completion-style=bundled -j $NPROC",
      "language": "cpp",
      "share_process": false
    }
  ]