default.nix

{ pkgs ? import <nixpkgs> {} }:

with pkgs;

let
  clang-wrapped = wrapCCWith {
    cc = llvmPackages.clang-unwrapped;
    bintools = wrapBintoolsWith {
      bintools = pkgs.runCommand "lld" {} ''
        mkdir -p $out/bin
        for i in ${llvmPackages.lld}/bin/*; do
          ln -s $i $out/bin/$(basename $i)
        done
        ln -s $out/bin/ld.lld $out/bin/ld
      '';
    };
  };
in (overrideCC stdenv clang-wrapped).mkDerivation {
  name = "env";
}