Nix env for rustc development

default.nix

{ pkgs ? import <nixpkgs> {} }:
let
  rust-etags = with pkgs; stdenv.mkDerivation {
    name = "rust-etags";

    src = fetchFromGitHub {
      owner = "nikomatsakis";
      repo = "rust-etags";
      rev = "master";
      sha256 = "0br2ipkcm3xdfnxn031swsvy7n6f3nwl2iklgjvrij55sf578m6j";
    };

    nativeBuildInputs = [ makeWrapper ];

    postPatch = ''
      sed -e 's:^    ctags:    ${ctags}/bin/ctags:' \
          -e "s:CTAGS=.*:CTAGS=\"$out/lib/rust-etags/ctags.rust\":" \
          -i rust-ctags
    '';

    installPhase = ''
      mkdir -p $out/lib/rust-etags $out/bin
      cp -r * $out/lib/rust-etags/
      ln -s $out/lib/rust-etags/rust-ctags $out/bin/rust-ctags
    '';
  };
in pkgs.mkShell {
  name = "rustc";

  buildInputs = [
    pkgs.llvm
    pkgs.cmake
    pkgs.rustup
    pkgs.gdb
    pkgs.graphviz

    rust-etags
  ];
}