{ pkgs ? import <nixpkgs> {} }:

let
  fenix = import (fetchTarball "https://github.com/nix-community/fenix/archive/main.tar.gz") {
    system = "x86_64-linux";
  };

  targets = ["i686-unknown-linux-gnu" "x86_64-unknown-linux-gnu"];

  fenixToolchain = fenix.stable.toolchain.overrideAttrs (old: {
    inherit targets;
  });

in
pkgs.rustPlatform.buildRustPackage {
  name = "my-crate";
  src = ./.;

  cargoLock = {
    lockFile = ./Cargo.lock;
  };

  nativeBuildInputs = with fenixToolchain; [
    rust
  ] ++ (builtins.concatLists (
    map (target: [
      (rust.override { inherit targets; })
    ]) targets
  ));

  buildAndTestSubdir = ".";

  buildPhase = ''
    ${builtins.concatStringsSep "\n" (map (target:
      ''
        cargo build --release --target ${target} --locked
      ''
    ) targets)}
  '';

  installPhase = ''
    mkdir -p $out/lib
    ${builtins.concatStringsSep "\n" (map (target:
      ''
        cp target/${target}/release/libmy_crate.a $out/lib/libmy_crate-${target}.a
      ''
    ) targets)}
  '';
}