this post was submitted on 18 Aug 2025
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Nix / NixOS

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Clangd LSP support for C/C++ on NixOS? (lemmy.world)
submitted 11 months ago* (last edited 11 months ago) by Zangoose@lemmy.world to c/nix@programming.dev
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I'm working on switching over to NixOS on my desktop and one of the last things I haven't got fully working is my neovim config. My LSP's are able to start, and all of them work fine except for clangd. For some reason, it can't find C/C++ header files for any installed libraries. I have all of the LSPs themselves installed through Mason in Neovim, and I have programs.nix-ld.enable = true enabled so they can be run correctly.

screenshot showing 'file not found' error on '#include <fcntl.h>'

screenshot showing 'file not found' error on '#include <SDL2/SDL2.h>'

Here is the shell.nix file I'm using for this project:

{ pkgs ? import <nixpkgs> {} }:
pkgs.mkShell.override { stdenv = pkgs.gccStdenv; } {
  nativeBuildInputs = with pkgs.buildPackages; [
    glibc libgcc
    clang-tools libclang
    SDL2 SDL2_image SDL2_sound
  ]; 
  CPATH = pkgs.lib.makeSearchPathOutput "dev" "include" pkgs.glibc pkgs.SDL2 pkgs.SDL2_Image pkgs.SDL2_sound;
}

Is there something extra I need to do to get clangd to find the C headers being used by the project? when I actually run gcc it compiles fine, it just can't seem to find them correctly in Neovim

Edit: Forgot to mention that I'm using this shell with direnv and launching nvim directly from the same shell that I'm compiling from

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[–] ruffsl@programming.dev 1 points 11 months ago (1 children)

Not really confident, but is the LSP running from a separate child process? Is that child process inheriting all of the anticipated environment variables from the shell that launched Neovim?

[–] Zangoose@lemmy.world 1 points 11 months ago (1 children)

The LSPs load when you open a file in nvim, so I think it would be a child process? Is there any way to check what environment variables a process has, like with gdb or something else?

[–] ruffsl@programming.dev 2 points 11 months ago

You inspect the /proc file tree or ps utility command: