I wonder if someone managed to compile the Linux kernel with some other compiler than gcc. Or if someone have ever tried? Question may seem to be silly or academic, but it a
Linux explicitly depends on some gcc extensions, so any other compiler must be compatible with the needed extensions, in that case.
This is not a "no", since it's of course not impossible for a separate compiler vendor/developer to track gcc's extensions, just a data point that might help you search.