core/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;
}