Ask HN: Can anyone recommend a macOS Systems programming

A recent Ask HN [0] posed the title question, but for Windows. That stated that "There's a hundred of these (books)..." and wanted recommendations. Not so many for macOS at all.

So I'd like to ask the same question for macOS. Especially wrt to C/C++. Everything on macOS is moving towards Swift but I suspect that the major apps are not using Swift and maybe won't be doing that any time soon.

[0]: https://news.ycombinator.com/item?id=40497383