On 10 May 2017, at 02:47, Bruce Evans <b...@optusnet.com.au> wrote: > > On Tue, 9 May 2017, Ian Lepore wrote: > >> On Tue, 2017-05-09 at 08:36 +0000, Edward Tomasz Napierala wrote: >>> Author: trasz >>> Date: Tue May 9 08:36:09 2017 >>> New Revision: 318017 >>> URL: https://svnweb.freebsd.org/changeset/base/318017 >>> >>> Log: >>> Fix device paths for USB serial adapters: the formatting strings >>> contain "%u", differently from eg uart(4) which uses "%r". >>> >> >> What is %r and where is it documented? > > In the source code. > > It was a ddb internal (but supported by -fformat-extensions, except IIRC > for %jr (1)), but is now used by makedev().
In clang, it is supported with __attribute__((__freebsd_kprintf__)) (since r280031). The format checker assumes the argument is a plain int, just like our patched gcc does. -Dimitry
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