Finding “wrapper” package locations (C++ LSP setup with Clang)

[gcv]

What problem are you trying to solve?

I’m not sure this is a feature request or a bug report, but here goes:

I’m trying to set up a C++ development environment using Clang. I install clang using devbox, which includes clangd (LSP). The clang++ compiler works fine, but clangd requires some extra magic to find the right headers. (I use Meson as a build system, which may be part of the problem — its compile_commands.json generation, which clangd relies on, does not find any implicit headers.)

After several hours of trial and error, I found that the following .clangd file makes everything work:

CompileFlags:
  Add: [
    "-isystem/nix/store/xl0vlc2wdchfbq8536zs19pj2r3xdmma-clang-wrapper-19.1.5/resource-root/include/c++/v1",
    "-isystem/nix/store/xl0vlc2wdchfbq8536zs19pj2r3xdmma-clang-wrapper-19.1.5/resource-root/include",
    "-isystem/nix/store/kj8hbqx4ds9qm9mq7hyikxyfwwg13kzj-glibc-2.40-36-dev/include"
  ]

Which is horrible, because I don’t want to hardcode Nix store paths in my project.

Unfortunately, it looks like the necessary headers are only available in clang-wrapper. And glibc is a transitive dependency somewhere.

What solution would you like?

I’d like to have those derivations linked in my project’s .devbox directory. Is this possible?

Alternatives you've considered

I tried installing things like clang-unwrapped and that does not seem to have the necessary headers. Maybe I did it wrong.