nix-profiling.nix

{ profiling ? false
, compiler ? null
}:
let baseHaskellPackages =
      if compiler != null
        then pkgs.haskell.packages.${compiler}
        else pkgs.haskellPackages;
    profilingOverride = super: if profiling then {
      mkDerivation = args: super.mkDerivation (args // {
        enableLibraryProfiling = true;
      });
    } else {};
    haskellPackages = baseHaskellPackages.override {
      overrides = self: super: profilingOverride super;
    };
    callPackage = haskellPackages.callPackage;
in callPackage ./project.nix { }