ghc-pic.nix

{ ghcVersion ? "ghc883"
}:
let
  overlays = [
    (self: super: {
      haskellPackagesPIC = super.haskell.packages.${ghcVersion}.override {
        overrides = self: super: { ghc = super.ghc.override { enableRelocatedStaticLibs = true; }; };
      };
    })
    (self: super: {
      haskellPackagesPIC = super.haskellPackagesPIC.override (old: {
        overrides = super.lib.composeExtensions (old.overrides or (_: _: {}))
          (hself: hsuper: {
            mkDerivation = x: (hsuper.mkDerivation x).override (old: {
              enableLibraryProfiling = false;
              doCheck = false;
              configureFlags = (old.configureFlags or []) ++ ["--ghc-options=-fPIC"];
            });
          });
      });
    })
  ];
  pkgs = import <nixpkgs> { overlays = overlays; };
  hspkgs = pkgs.haskellPackagesPIC.ghcWithPackages (h: with h; [ text ]);
in
pkgs.mkShell {
  buildInputs = [ hspkgs ];
}