cc-wrapper: adding a cc-wrapper-hook to the cc-wrapper

[danielbarter]

Description of changes

Adding a cc-wrapper-hook to the cc-wrapper. The ld-wrapper already has a post-link-hook. My main motivation for adding this is it will allow us to reliably generate compile_commands.json files which are required for LSP servers to function for C/C++ projects. Existing tools for generating compile_commands.json are unreliable on nixos because they struggle to distinguish between the compiler wrappers and the compilers themselves.

See my earlier PR for an example of how this could be used: #192694. This PR is just the infrastructure part of my earlier PR. Also see the discussion on discourse: https://discourse.nixos.org/t/using-nix-infrastructure-to-reliably-generate-compile-commands-json/21961/20

I am hoping that this smaller PR will be easier to merge!

Things done

• add cc-wrapper-hook to cc-wrapper.sh.
• document both cc-wrapper-hook and post-link-hook.

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandbox = true set in nix.conf? (See Nix manual)
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 22.11 Release Notes (or backporting 22.05 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
  • (Release notes changes) Ran nixos/doc/manual/md-to-db.sh to update generated release notes
• Fits CONTRIBUTING.md.

[Ericson2314]

Can you link the PR where post link hook was added?

[danielbarter]

Looks like it was added here: #105026

[Ericson2314]

I guess this is OK. Another option is to just manually wrap these packages oneself, so we don't need a hook, but I guess this is fine.

[nixos-discourse]

This pull request has been mentioned on NixOS Discourse. There might be relevant details there:

https://discourse.nixos.org/t/using-nix-infrastructure-to-reliably-generate-compile-commands-json/21961/21