In reply to @axman6:matrix.org
Is there an easy way to make a wrapper for a binary which executes it using hostPlatform.emulator?

Yes

https://github.com/NixOS/nixpkgs/blob/fcd099251655af6f7c935df9baf72b5963f33e86/pkgs/tools/admin/winbox/default.nix#L50 (here src is a exe)

https://github.com/search?q=repo%3ANixOS%2Fnixpkgs+%2FmakeWrapper.%2Bjre%2F&type=code

Is there an example somewhere of where multilib + crosspkgs is broken? From #380325

What would it take to fix it?

Hello! I'm new to cross-compiling on NixOS. I want to compile C code for my custom M68k computer.

This is what my flake.nix file currently looks like:

{
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    flake-utils.url = "github:numtide/flake-utils?ref=main";
  };

  outputs =
    inputs:
    inputs.flake-utils.lib.eachDefaultSystem (
      system:
      let
        pkgs = inputs.nixpkgs.legacyPackages.${system};
      in
        {
          devShells.default = pkgs.mkShell {
            packages = (
              with pkgs; [
                minipro
                gnumake
                pkgsCross.m68k.buildPackages.gcc
                xxd
              ]
            );
          };
        }
    );
}

I think I want to remove the pkgsCross.m68k line and add in crossSystem pointing at this patch from K900: https://github.com/K900/nixpkgs/commit/e8d4e76093cd396805e76c908734a351cc6d1f39
But I'm not really clear on what I'm actually doing (plus I want my other packages to not be cross-compiled as I want to run them on my x86 box)