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Linus Torvalds: Speaks on the Rust vs C Linux Divide
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This is how they want to frame it. C has footguns, therefore use Rust—instead of Rust is one of the options you could use.
I don't think Ada in the kernel would get any cultural acceptance. Rust has been hard enough. C++ was vehemently rejected decades ago though the reasons made some sense at the time. Adopting C++ today would be pretty crazy. I don't see much alternative to Rust (or in a different world, Ada) in the monolithic kernel. But Rust seems like it's still in beta test, and the kernel architecture itself seems like a legacy beast. Do you know of anything else? I can't take D or Eiffel or anything like that seriously. And part of it is the crappiness of the hardware companies. Maybe it will have to be left to future generations.