flake.nix

{
  description = "arithmetic";

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

  outputs = { self, nixpkgs, flake-utils }@inputs:
    let
      overlay = import ./overlay.nix;
    in
    flake-utils.lib.eachDefaultSystem
      (system:
        let
          pkgs = import nixpkgs { inherit system; overlays = [ overlay ]; };
          deps = with pkgs; [
            git
            mill
            circt
            verilator
            testfloat
            cmake
            libargs
            glog
            fmt
            zlib
            ninja
          ];
        in
        {
          legacyPackages = pkgs;
          devShell = pkgs.mkShell {
            buildInputs = deps;
            env = {
                  "SOFT_FLOAT_LIB_DIR" = "${pkgs.softfloat}";
                  "TEST_FLOAT_LIB_DIR" = "${pkgs.testfloat}";
            };
          };
          packages.softfloat = pkgs.softfloat;
          packages.testfloat = pkgs.testfloat;
        }
      )
    // { inherit inputs; overlays.default = overlay; };
}