[Bug c/67956] gcc's printf attribute accepts %m as a format character

[sch...@linux-m68k.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67956

--- Comment #1 from Andreas Schwab <sch...@linux-m68k.org> ---
*** Bug 67957 has been marked as a duplicate of this bug. ***