does make world also builds the kernel? It's been a long time since I last used a bsd and I seem to recall that "world" was only userland, but I may be completely wrong
world is only userland, make kernel builds the kernel. People have successfully built the kernel with clang and booted it, but it is not yet known if all of the code paths are correct and there may be hard to find bugs, also certain code does not yet compile and has to be commented out.