"%m" formatting code and "syslog like"

[Ian Bruene <ianbruene%gmail.com@localhost>]

Hello

I am one of the developers on NTPsec and we are getting warnings on 
NetBSD 8.0 in the form:

../../ntpd/ntp_io.c:1962:14: warning: %m is only allowed in syslog(3) 
like functions [-Wformat=]

This feature appears to have been added here: 
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67956

From googling I have been able to find the flag that is set for this 
warning to be suppressed, but we have not been able to find any 
documentation on how to properly identify a function as "syslog like"

(Apologies if this is the wrong mailing list, it looked closest to what 
I was looking for)

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