nixpkgs/pkgs/build-support/lib/cmake.nix

{ stdenv, lib }:

let
  inherit (lib) findFirst isString optional optionals;

  cmakeFlags' =
    optionals (stdenv.hostPlatform != stdenv.buildPlatform) ([
      "-DCMAKE_SYSTEM_NAME=${findFirst isString "Generic" (optional (!stdenv.hostPlatform.isRedox) stdenv.hostPlatform.uname.system)}"
    ] ++ optionals (stdenv.hostPlatform.uname.processor != null) [
      "-DCMAKE_SYSTEM_PROCESSOR=${stdenv.hostPlatform.uname.processor}"
    ] ++ optionals (stdenv.hostPlatform.uname.release != null) [
      "-DCMAKE_SYSTEM_VERSION=${stdenv.hostPlatform.uname.release}"
    ] ++ optionals (stdenv.hostPlatform.isDarwin) [
      "-DCMAKE_OSX_ARCHITECTURES=${stdenv.hostPlatform.darwinArch}"
    ] ++ optionals (stdenv.buildPlatform.uname.system != null) [
      "-DCMAKE_HOST_SYSTEM_NAME=${stdenv.buildPlatform.uname.system}"
    ] ++ optionals (stdenv.buildPlatform.uname.processor != null) [
      "-DCMAKE_HOST_SYSTEM_PROCESSOR=${stdenv.buildPlatform.uname.processor}"
    ] ++ optionals (stdenv.buildPlatform.uname.release != null) [
      "-DCMAKE_HOST_SYSTEM_VERSION=${stdenv.buildPlatform.uname.release}"
    ] ++ optionals (stdenv.buildPlatform.canExecute stdenv.hostPlatform) [
      "-DCMAKE_CROSSCOMPILING_EMULATOR=env"
    ] ++ optionals stdenv.hostPlatform.isStatic [
      "-DCMAKE_LINK_SEARCH_START_STATIC=ON"
    ]);

  makeCMakeFlags = { cmakeFlags ? [], ... }: cmakeFlags ++ cmakeFlags';

in
{
  inherit makeCMakeFlags;
}