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Date: Tue, 31 May 2011 08:32:54 -0700
From: Steve Kargl <sgk@troutmask.apl.washington.edu>
To: Ben Laurie <ben@links.org>
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Cc: svn-src-head@FreeBSD.org, svn-src-all@FreeBSD.org,
	src-committers@FreeBSD.org, Pawel Jakub Dawidek <pjd@FreeBSD.org>
Subject: Re: svn commit: r222084 - head/contrib/gperf/src
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On Tue, May 31, 2011 at 03:28:45PM +0100, Ben Laurie wrote:
> On 18/05/2011 22:16, Pawel Jakub Dawidek wrote:
> > On Wed, May 18, 2011 at 09:06:20PM +0000, Ben Laurie wrote:
> >> Author: benl
> >> Date: Wed May 18 21:06:20 2011
> >> New Revision: 222084
> >> URL: http://svn.freebsd.org/changeset/base/222084
> >>
> >> Log:
> >>   Fix clang warnings.
> >>   
> >>   Approved by:	philip (mentor)
> > [...]
> >> -            fprintf (stderr, " by changing asso_value['%c'] (char #%d) to %d\n",
> >> +            fprintf (stderr, " by changing asso_value['%c'] (char #%zd) to %d\n",
> >>                       *p, p - union_set + 1, asso_values[(unsigned char)(*p)]);
> > 
> > Hmm, both 'p' and 'union_set' are 'char *' and %zd is for ssize_t. It is
> > a bit strange that it fixes the warning.
> 
> Why? The difference between two pointers is ssize_t, surely?
> 

>From n1256.pdf,

  When two pointers are subtracted, both shall point to elements of
  the same array object, or one past the last element of the array
  object; the result is the difference of the subscripts of the two
  array elements.  The size of the result is implementation-defined,
  and its type (a signed integer type) is ptrdiff_t defined in the
  <stddef.h> header.

ptrdiff_t is not necessarily that same as ssize_t.

-- 
Steve