(though it's a shame the GNU guys, partly due to their own mistakes, are losing an important part of the FLOSS ecosystem to Apple...), but I'm personally more interested in the more theoretical projects of verified compilation toolchains, such as compcert (
http://compcert.inria.fr/ ). It's unrealistic to hope to have a completely verified ocaml-to-assembly compiler, as we would first need formal semantics for the OCaml language itself, but it is the very point : doing that kind of things forces you to have formal semantics, which is very interesting in many respects.
Asking for a decent compiler was once the way to tell apart the serious languages from the insane string-fiddling script languages, but the line is blurred by the indecent amount of work injected in the optimization of those insane languages. Formal semantics will distinguish the gentlemen of the future.