Afaik the Gentoo based ChromeOS is being replaced by Android.
https://en.m.wikipedia.org/wiki/Microsoft_POSIX_subsystem
The Zircon kernel does not support signals, so basic C is not going to work well.
"It is heavily inspired by Unix kernels, but differs greatly. For example, it does not support Unix-like signals, but incorporates event-driven programming and the observer pattern."
https://en.m.wikipedia.org/wiki/Fuchsia_(operating_system)#K...