https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108221
--- Comment #12 from Jonathan Wakely <redi at gcc dot gnu.org> --- The std::span default constructor that's causing problems has been there for a few years, but nobody pointed out it didn't work for this mode. For a target to remain usable we need test results and regular fixes. Otherwise things stay broken for years and then we have to fix dozens of things all at once. This target has bitrotted quite badly.
