[BSDobelix]

Because the System has to be self-hosting, remember it's a whole OS and not just the Kernel, and as you can see ~25% of src is C++, 62% C etc.

Rewrite everything C++ is not a small undertaking with (maybe?) not allot plus-sides, and even then you still need C++ because of LLVM. LLVM and GCC are both C++, and you have to compile the Compiler (self-hosting), and even if your a 100% Rust or C OS, you still need C++ because of LLVM/GCC....well if you want a modern compiler ;)

https://github.com/freebsd/freebsd-src

[tialaramex]

But when you look what all that C++ is doing in Base, it seems like it's basically LLVM and then a lot of code that's just there to help you write more C++ code. Not a whole lot of the FreeBSD Base userspace, the uilities and so on - is actually written in C++ despite that. It's getting a free ride because the compiler uses it.

[BSDobelix]

>it seems like it's basically LLVM

Not important, you have to compile your Compiler fini, btw for Linux (just the Kernel) you need Perl ;)