Can't seem to find information of how to configure clangd correctly

[mohabouje]

I want to give a try to this editor. I am building a project with xmake. The build system generates a compile_commands.json in a folder in the root project called .xmake.

I want to configure the LSP server for C++ to set a specific path to the binary and pass the command that points to this file.

[JosephTLyons]

I went ahead and converted this into a Q&A Discussion - I'm not entirely sure myself if / how this can be set up, but maybe someone on thea team or community knows.

[Congyuwang]

I'm using cmake with clangd. It seems that I don't need to configure a path to clangd. I guess zed is using the default clangd server on MacOS which is /usr/bin/clangd from Xcode.

When building the cmake project, adding a -DCMAKE_EXPORT_COMPILE_COMMANDS=ON will produce the compile_commands.json for clangd.

Also, the llvm-clangd guide page gives some decent instructions on how to setup clangd. For example, use a .clangd file in your project for configuration.

But maybe I didn't answer your question as of how to set a specific path to a clangd binary.

[Congyuwang]

Zed doc does have a paragraph for LSP, but it's not very detailed: https://docs.zed.dev/configuration/configuring-zed#lsp

[zambetti]

I am also searching for clangd configuration documentation.

I've placed a .clangd configuration file in the root of my project that specifies include paths (this is also root of the open Zed 'project'); but it appears that the .clangd file is not being used by the language server.

••Update 1••

After some trial and error, the following .clangd in the root of my project worked for my situation, which is simpler than the original topic of this thread, but maybe it helps someone...

CompileFlags:
  Add:
    - "--include=/path/to/file.h"
    - "--include-directory=/path/to/directory-1"
    - "--include-directory=/path/to/directory-2"

••Update 2••

So now I've found a real need for the "lsp" property in settings.json...

  "lsp": {
      "clangd": {
          "header-insertion": "never"
      }
  },

I was hoping this would disable clangd's header insertion, but unfortunately it does not. Does anyone know if documentation exists for configuring the LSP?

[alexlnkp]

Sorry for necrobumping, but I believe I must specify: RELATIVE PATHS DON'T WORK
Use absolute paths only for the .clangd

[EDEADLINK]

This is how you set clangd command-line options:

"lsp": {
	"clangd": {
		"binary": {
			"path_lookup": true,
			"path": "clangd",
			"arguments": ["--header-insertion=never"]
		}
	}
}

And leaving off the path and path_lookup does not work.
Yeah, this should be documented somewhere jesus christ, the ergonomics here suck.

[ArhumMK]

On windows and i had to set "path": to the exact directory of clangd down to clangd.exe for it to work (globally). setting up lsp's on windows has been a massive pain so far but its understandable i guess.

[Poldraunic]

@EDEADLINK thank you very much! This worked like a charm.