Seems like a strange goal. The Linux kernel is not what I'd call standards-compliant code. I would think that standards-compliance would be a useful goal for a compiler. And I fail to see why it is so important. And why it warrants at the very least, extreme exaggeration. The title of the message is false:
"Clang can now compile a functional Linux Kernel (version 2.6.36, SMP)."
No, it cannot, if you need to compile certain modules w/ GCC in order to get it to boot. Unless you don't consider booting to be something a kernel must do to be "functional".