https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123326
--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Can you add -Wl,-M option so that the linker prints why it wants to link in libstdc++.a(format.o)? It certainly doesn't link that for me. If something needs it, then as I tried to write, it is currently broken when using libstdc++.a but I think it has been broken for quite a while.
