This. FreeBSD's been building on CLANG for amd64 and i386 since before 10.0 (now on 11).
See, for ex., https://wiki.freebsd.org/BuildingFreeBSDWithClang https://unix.stackexchange.com/questions/49906/why-is-freebs...
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OpenBSD is also now building the kernel/userland and most of the ports tree with Clang for i386/amd64 and arm64. 6.2 will ship with it as the default system compiler.
> Kroah-Hartman said that he wished there was a competitor to the Linux kernel.
Linux people refuse to look outside their vacuum chamber.
That was not what he said. Article is wrong. He started he wants more competition amongst compiler vendors for the benefit of the kernel.
> Sorry, but you might have missed my follow-on comment which was, "I wish we had a viable competitor to the Linux kernel as well". Jake correctly quoted me here.