[jdefelice]

Not sure if this is entirely what you are after but Andreas Kling of SerenityOS builds an IDE from scratch[1] for his own operating system. While I don't personally know C++ I found the videos interesting and fun to watch.

[1] DevTools hacking playlist - https://www.youtube.com/playlist?list=PLMOpZvQB55bfeIHSA71J8...