[Bug c/88270] -Wformat-XXX option for flagging %m

[joseph at codesourcery dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88270

--- Comment #6 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
A format attribute for syslog is bug 15338.

(A fully general system for extensible format checking is hard, as I think 
it would be a bad idea for it effectively to turn the internals of the 
format checking implementation into a public API that needs to remain 
stable.  More specific new features, such as an attribute for syslog or 
more accurate descriptions of what system printf supports on different 
systems, are easier.)