https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105297
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Based on the ICE details (on __data member of anonymous struct inside of __from_chars_alnum_to_val_table) I think this started with: r12-8175-ga54137c88061c7495728fc6b8dfd0474e812b2cb