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

[christos at zoulas dot com]

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

--- Comment #2 from Christos Zoulas <christos at zoulas dot com> ---
something is wrong with the bug tracking system, when posting a bug with an
attachment as the first post; this is how the dup got created.