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Date: Thu, 25 Apr 2013 11:39:05 -0600
From: Eric Blake <eblake@redhat.com>
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Subject: Re: [Qemu-devel] Git head build problem (popcountl vs. system
	headers)
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To: Richard Henderson <rth@twiddle.net>
Cc: Martin Husemann <martin@duskware.de>, Laszlo Ersek <lersek@redhat.com>, qemu-devel@nongnu.org

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On 04/25/2013 11:09 AM, Richard Henderson wrote:
> On 2013-04-25 14:38, Laszlo Ersek wrote:
>>> <strings.h> is the K&R header supplanted by ISO <string.h>.
>>> Is there any good reason that we're including it at all?
>>
>> - <strings.h> is a portable SUS/POSIX header:
>>
>> http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/strings.h.htm=
l
>=20
> Huh.  Ok, fine, but what do we think we're using out of it that
> isn't in <string.h>?

strcasecmp().  Just because some (many) systems pollute <string.h> with
strcasecmp() without you having to explicitly include <strings.h> (and
POSIX allows but not requires this:
http://pubs.opengroup.org/onlinepubs/9699919799/functions/V2_chap02.html#=
tag_15_02_02
says that the str* prefix is reserved in <string.h>), a
strictly-conforming implementation cannot rely on this extension, and
there are systems where you have to get strcasecmp() from <strings.h>,
just as POSIX requires.

--=20
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org


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