On 25.06.2017 19:27, Joe Perches wrote: > Every use of %M is going to cause gcc when using __printf to emit > a warning like: > > unknown conversion type character ‘M’ in format [-Wformat=]
Yeah, that's still an open problem. Actually, I still haven't found out, how it's done w/ all the other kernel-internal conversions. I was under the impression, there was some magic to tell the compiler which letters correspond to which types - unfortunately, didn't find anything like that. Is that really hardcoded in gcc ? > Beyond that, why is this useful? Use that instead of %d where errno values are printed/logged. > There can't possibly be any fast-path use. I'm using it eg. for driver development - always having to look up the numbers is quite ugly and time consuming. > Why not just create a function that does errno/string conversions? Already was about to do so. Shall I call it strerror() ? --mtx -- Enrico, Sohn von Wilfried, a.d.F. Weigelt, metux IT consulting +49-151-27565287