I seem to have installed everything for C++, but lsp still doesn’t see the header files for some reason.

Define “installed”. If you put it in your config, remove it. If you made a shell.nix or some mkShell environment, share that code.

My flake.nix: { description = "C++ dev"; inputs = { nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable"; }; outputs = { self, nixpkgs }: let system = "x86_64-linux"; pkgs = nixpkgs.legacyPackages.${system}; in { devShells.${system}.default = pkgs.mkShell.…

[image] Clang, clang++, and clangd can't find headers, even with compile_commands.json Help What you’re meant to do is override the stdenv if you want it to use clang: pkgs.mkShell.override { stdenv = pkgs.clang19Stdenv; } { packages = [ pkgs.cmake # ...…

{ description = "C++ dev"; inputs = { nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable"; }; outputs = { self, nixpkgs }: let system = "x86_64-linux"; pkgs = nixpkgs.legacyPackages.${system}; in { devShells.${system}.default = pkgs.mkShell.override { …

What exactly does “not working” mean?

The program is now being compiled, but the code editors (I tried in helix and zed-editor) show the error 'iostream' file not found (clang pp_file_not_found)

Do you have a compile_commands.json?

No, but how do I create it? (sorry, I’m just a newbie and I haven’t figured it out yet)

Hi there, I use Zed Editor with C++ too and ran into the same issue with header files. I found a workaround in some discussions and while it’s definitely not ideal - it’s a nice temporary fix, at least for me, who still learning NixOS :sweat_smile:. In your CMakeLists.txt, add this: set(CMAKE_EXP…

Sorry to come back here after all this time, but I’ve already gone through everything, and it doesn’t help, the editors don’t see the header files.

How to create a nix shell for C++ programming

Help

waffle8946 November 28, 2025, 5:05pm 4