How to override CC by Nix overlay?

cc-overlay.nix

(self: super:
  let
    # gcc = super.pkgs.gcc8;
    # gcc8 = super.pkgs.gcc8.override { stdenv = super.stdenv; };
    stdenv = super.stdenvAdapters.overrideCC super.stdenv super.pkgs.gcc8;
  in
    {
      inherit stdenv; # gcc8 gcc;
      # stdenv = super.overrideCC super.stdenv self.pkgs.gcc;
      # gcc8 = super.gcc8.override { stdenv = super.stdenv; };
    } # // stdenv.overrides self super
  )

This awkward expression can be simplified to

self: super: {
  stdenv =
    (super.overrideCC super.stdenv super.gcc8).override
      { cc = super.stdenv.cc; };
}

---

Still, it's questionable whether it's the right way to override compiler.

@AleXoundOS nice, thank you for a reply!