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From: Dimitry Andric <dim@FreeBSD.org>
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Subject: Re: svn commit: r318017 - head/share/man/man4
Date: Wed, 10 May 2017 10:46:12 +0200
In-Reply-To: <20170510095816.X5705@besplex.bde.org>
Cc: Ian Lepore <ian@freebsd.org>, Edward Tomasz Napierala <trasz@freebsd.org>,
 src-committers@freebsd.org, svn-src-all@freebsd.org,
 svn-src-head@freebsd.org
To: Bruce Evans <brde@optusnet.com.au>
References: <201705090836.v498a9JJ035778@repo.freebsd.org>
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On 10 May 2017, at 02:47, Bruce Evans <brde@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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