Nix setup for MIT 6.1810 lab tools

shell.nix

{
  pkgs ? import <nixpkgs> { },
}:

let
  targetTriple = "riscv64-unknown-linux-gnu";

  pkgsCross = import <nixpkgs> {
    crossSystem = {
      config = targetTriple;
    };
  };

  inherit (pkgsCross.stdenv.cc) targetPrefix;
in

pkgs.mkShell {
  packages = with pkgs; [
    git
    gnumake
    gcc
    # gdb-multiarch
    gdb
    qemu
    pkgsCross.buildPackages.binutils
    pkgsCross.buildPackages.gcc
  ];

  shellHook = ''
    echo "Using cross toolchain targeting ${targetTriple}"
    export TARGET_TRIPLE=${targetTriple}
    export CROSS_COMPILE=${targetPrefix}
    export CC=${targetPrefix}gcc
    export CXX=${targetPrefix}g++
    export AS=${targetPrefix}as
    export AR=${targetPrefix}ar
    export LD=${targetPrefix}ld
    export STRIP=${targetPrefix}strip
  '';
}