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Re:Writing an OS in Rust: Advanced Paging by porpoisely on Monday January 28, 2019 @08:53PM (#19023012)
Pretty sure the linux kernel is exclusively C. Actually the major OS kernels are pretty much all C - Windows, FreeBSD, MacOS and other BSD derivatives. The GNU software and utils could be written in C++.
Re:Writing an OS in Rust: Advanced Paging by int_19h on Monday January 28, 2019 @10:23PM (#19023440)
MacOS is not a BSD derivative when it comes to kernel.

And I'm pretty sure Windows has some C++ in kernel space. It might be limited (no exceptions etc), but that's another matter.