https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79183
--- Comment #5 from Martin Sebor <msebor at gcc dot gnu.org> --- I see, thanks for the pointer. Looks like warning_n() is used in gcc/ipa-devirt.c and error_n() in gcc/cp/pt.c. gimple-ssa-sprintf.c contains between 7 and 23 instances of these "%wu byte" vs "%wu bytes" forms so it will be a fun exercise to fix.
