https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120086
--- Comment #5 from Jørgen Kvalsvik <j at lambda dot is> --- Does the pretty-print.cc test fail, too? Anyway, the fix is simple, in a way -- we don't really need the full size_t width (probably), so I'd wager it's harmless to change it to %u. It's not the nicest change since it would narrow the type for no obvious reason, and other uses of %zu would still be broken. I'm happy to do it, but some other maintainer should probably sign off on the approach.