{ lib
, buildPackages, pkgs, targetPackages
, generateSplicesForMkScope, makeScopeWithSplicing'
, stdenv
, preLibcCrossHeaders
, config
}:

let
  # Prefix for binaries. Customarily ends with a dash separator.
  #
  # TODO(@Ericson2314) Make unconditional, or optional but always true by
  # default.
  targetPrefix = lib.optionalString (stdenv.targetPlatform != stdenv.hostPlatform)
                                        (stdenv.targetPlatform.config + "-");

  # Bootstrap `fetchurl` needed to build SDK packages without causing an infinite recursion.
  fetchurlBoot = import ../build-support/fetchurl/boot.nix {
    inherit (stdenv) system;
  };

  aliases = self: super: lib.optionalAttrs config.allowAliases (import ../top-level/darwin-aliases.nix lib self super pkgs);

  mkBootstrapStdenv =
    stdenv:
    stdenv.override (old: {
      extraBuildInputs = map (
        pkg:
        if lib.isDerivation pkg && lib.getName pkg == "apple-sdk" then
          pkg.override { enableBootstrap = true; }
        else
          pkg
      ) (old.extraBuildInputs or [ ]);
    });

  mkStub = pkgs.callPackage ../os-specific/darwin/apple-sdk/mk-stub.nix { };
in

makeScopeWithSplicing' {
  otherSplices = generateSplicesForMkScope "darwin";
  extra = spliced: spliced.apple_sdk.frameworks;
  f = lib.extends aliases (self: let
  inherit (self) mkDerivation callPackage;

  # Open source packages that are built from source
  apple-source-packages = lib.packagesFromDirectoryRecursive {
    callPackage = self.callPackage;
    directory = ../os-specific/darwin/apple-source-releases;
  };

  # Compatibility packages that aren’t necessary anymore
  apple-source-headers = {
    libresolvHeaders = lib.getDev self.libresolv;
    libutilHeaders = lib.getDev self.libutil;
  };

  # Must use pkgs.callPackage to avoid infinite recursion.
  impure-cmds = pkgs.callPackage ../os-specific/darwin/impure-cmds { };

  # macOS 10.12 SDK
  apple_sdk_10_12 = pkgs.callPackage ../os-specific/darwin/apple-sdk { };

  # macOS 11.0 SDK
  apple_sdk_11_0 = pkgs.callPackage ../os-specific/darwin/apple-sdk-11.0 { };

  # macOS 12.3 SDK
  apple_sdk_12_3 = pkgs.callPackage ../os-specific/darwin/apple-sdk-12.3 { };

  # Pick an SDK
  apple_sdk = {
    "10.12" = apple_sdk_10_12;
    "11.0" = apple_sdk_11_0;
  }.${stdenv.hostPlatform.darwinSdkVersion}
  or (throw "Unsupported sdk: ${stdenv.hostPlatform.darwinSdkVersion}");

  stubs = {
    inherit apple_sdk apple_sdk_10_12 apple_sdk_11_0 apple_sdk_12_3;
    libobjc = self.objc4;
  } // lib.genAttrs [
    "CF"
    "CarbonHeaders"
    "CommonCrypto"
    "CoreSymbolication"
    "IOKit"
    "Libc"
    "Libinfo"
    "Libm"
    "Libnotify"
    "Librpcsvc"
    "Libsystem"
    "LibsystemCross"
    "Security"
    "architecture"
    "configd"
    "configdHeaders"
    "darwin-stubs"
    "dtrace"
    "dyld"
    "eap8021x"
    "hfs"
    "hfsHeaders"
    "launchd"
    "libclosure"
    "libdispatch"
    "libmalloc"
    "libplatform"
    "libpthread"
    "mDNSResponder"
    "objc4"
    "ppp"
    "xnu"
  ] (mkStub apple_sdk.version);
in

impure-cmds // apple-source-packages // apple-source-headers // stubs // {

  stdenvNoCF = stdenv.override {
    extraBuildInputs = [];
  };

  inherit (self.adv_cmds) ps;

  binutils-unwrapped = callPackage ../os-specific/darwin/binutils {
    inherit (pkgs) cctools;
    inherit (pkgs.llvmPackages) clang-unwrapped llvm llvm-manpages;
  };

  binutils = pkgs.wrapBintoolsWith {
    libc =
      if stdenv.targetPlatform != stdenv.hostPlatform
      then pkgs.libcCross
      else pkgs.stdenv.cc.libc;
    bintools = self.binutils-unwrapped;
  };

  # x86-64 Darwin gnat-bootstrap emits assembly
  # with MOVQ as the mnemonic for quadword interunit moves
  # such as `movq %rbp, %xmm0`.
  # The clang integrated assembler recognises this as valid,
  # but unfortunately the cctools.gas GNU assembler does not;
  # it instead uses MOVD as the mnemonic.
  # The assembly that a GCC build emits is determined at build time
  # and cannot be changed afterwards.
  #
  # To build GNAT on x86-64 Darwin, therefore,
  # we need both the clang _and_ the cctools.gas assemblers to be available:
  # the former to build at least the stage1 compiler,
  # and the latter at least to be detectable
  # as the target for the final compiler.
  binutilsDualAs-unwrapped = pkgs.buildEnv {
    name = "${lib.getName self.binutils-unwrapped}-dualas-${lib.getVersion self.binutils-unwrapped}";
    paths = [
      self.binutils-unwrapped
      (lib.getOutput "gas" pkgs.cctools)
    ];
  };

  binutilsDualAs = self.binutils.override {
    bintools = self.binutilsDualAs-unwrapped;
  };

  binutilsNoLibc = pkgs.wrapBintoolsWith {
    libc = preLibcCrossHeaders;
    bintools = self.binutils-unwrapped;
  };

  # Removes propagated packages from the stdenv, so those packages can be built without depending upon themselves.
  bootstrapStdenv = mkBootstrapStdenv pkgs.stdenv;

  libSystem = callPackage ../os-specific/darwin/libSystem { };

  # TODO(@connorbaker): See https://github.com/NixOS/nixpkgs/issues/229389.
  cf-private = self.apple_sdk.frameworks.CoreFoundation;

  DarwinTools = callPackage ../os-specific/darwin/DarwinTools { };

  print-reexports = callPackage ../os-specific/darwin/print-reexports { };

  rewrite-tbd = callPackage ../os-specific/darwin/rewrite-tbd { };

  checkReexportsHook = pkgs.makeSetupHook {
    name = "darwin-check-reexports-hook";
    propagatedBuildInputs = [ pkgs.darwin.print-reexports ];
  } ../os-specific/darwin/print-reexports/setup-hook.sh;

  libunwind = callPackage ../os-specific/darwin/libunwind { };

  sigtool = callPackage ../os-specific/darwin/sigtool { };

  signingUtils = callPackage ../os-specific/darwin/signing-utils { };

  postLinkSignHook = callPackage ../os-specific/darwin/signing-utils/post-link-sign-hook.nix { };

  autoSignDarwinBinariesHook = pkgs.makeSetupHook {
    name = "auto-sign-darwin-binaries-hook";
    propagatedBuildInputs = [ self.signingUtils ];
  } ../os-specific/darwin/signing-utils/auto-sign-hook.sh;

  iosSdkPkgs = callPackage ../os-specific/darwin/xcode/sdk-pkgs.nix {
    buildIosSdk = buildPackages.darwin.iosSdkPkgs.sdk;
    targetIosSdkPkgs = targetPackages.darwin.iosSdkPkgs;
    inherit (pkgs.llvmPackages) clang-unwrapped;
  };

  iproute2mac = callPackage ../os-specific/darwin/iproute2mac { };

  lsusb = callPackage ../os-specific/darwin/lsusb { };

  openwith = callPackage ../os-specific/darwin/openwith { };

  stubs = pkgs.callPackages ../os-specific/darwin/stubs { };

  trash = callPackage ../os-specific/darwin/trash { };

  inherit (self.file_cmds) xattr;

  inherit (pkgs.callPackages ../os-specific/darwin/xcode { })
    xcode_8_1 xcode_8_2
    xcode_9_1 xcode_9_2 xcode_9_3 xcode_9_4 xcode_9_4_1
    xcode_10_1 xcode_10_2 xcode_10_2_1 xcode_10_3
    xcode_11 xcode_11_1 xcode_11_2 xcode_11_3_1 xcode_11_4 xcode_11_5 xcode_11_6 xcode_11_7
    xcode_12 xcode_12_0_1 xcode_12_1 xcode_12_2 xcode_12_3 xcode_12_4 xcode_12_5 xcode_12_5_1
    xcode_13 xcode_13_1 xcode_13_2 xcode_13_3 xcode_13_3_1 xcode_13_4 xcode_13_4_1
    xcode_14 xcode_14_1
    xcode_15 xcode_15_0_1 xcode_15_1 xcode_15_2 xcode_15_3 xcode_15_4
    xcode_16 xcode_16_1
    xcode;

  xcodeProjectCheckHook = pkgs.makeSetupHook {
    name = "xcode-project-check-hook";
    propagatedBuildInputs = [ pkgs.pkgsBuildHost.openssl ];
  } ../os-specific/darwin/xcode-project-check-hook/setup-hook.sh;

  # Formerly the CF attribute. Use this is you need the open source release.
  swift-corelibs-foundation = callPackage ../os-specific/darwin/swift-corelibs/corefoundation.nix { };

  # As the name says, this is broken, but I don't want to lose it since it's a direction we want to go in
  # libdispatch-broken = callPackage ../os-specific/darwin/swift-corelibs/libdispatch.nix { };

  # See doc/packages/darwin-builder.section.md
  linux-builder = lib.makeOverridable ({ modules }:
    let
      toGuest = builtins.replaceStrings [ "darwin" ] [ "linux" ];

      nixos = import ../../nixos {
        configuration = {
          imports = [
            ../../nixos/modules/profiles/nix-builder-vm.nix
          ] ++ modules;

          # If you need to override this, consider starting with the right Nixpkgs
          # in the first place, ie change `pkgs` in `pkgs.darwin.linux-builder`.
          # or if you're creating new wiring that's not `pkgs`-centric, perhaps use the
          # macos-builder profile directly.
          virtualisation.host = { inherit pkgs; };

          nixpkgs.hostPlatform = lib.mkDefault (toGuest stdenv.hostPlatform.system);
        };

        system = null;
      };

    in
      nixos.config.system.build.macos-builder-installer) { modules = [ ]; };

  linux-builder-x86_64 = self.linux-builder.override {
    modules = [ { nixpkgs.hostPlatform = "x86_64-linux"; } ];
  };

});
}