Date: Thu, 20 Jul 2006 11:04:58 +0900 From: Hajimu UMEMOTO <ume@FreeBSD.ORG> To: "M. Warner Losh" <imp@bsdimp.com> Cc: freebsd-stable@FreeBSD.ORG, ghelmer@palisadesys.com Subject: Re: Can't run newly-compiled RELENG_6 programs under RELENG_6_1: missing __res_state Message-ID: <ygeejwhqbed.wl%ume@mahoroba.org> In-Reply-To: <20060719.181215.63038086.imp@bsdimp.com> References: <44BE8912.9010807@palisadesys.com> <20060719.181215.63038086.imp@bsdimp.com>
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Hi,
>>>>> On Wed, 19 Jul 2006 18:12:15 -0600 (MDT)
>>>>> "M. Warner Losh" <imp@bsdimp.com> said:
imp> In message: <44BE8912.9010807@palisadesys.com>
imp> Guy Helmer <ghelmer@palisadesys.com> writes:
imp> : We just tried running programs under RELENG_6_1 that were compiled under
imp> : RELENG_6 checked out 2006-07-19, and couldn't because of the undefined
imp> : symbol "__res_state"l, which I would assume is a result of the recent
imp> : MFC of the BIND 9 resolver library. Is this to be expected? It will
imp> : cause a bit of a hassle...
imp> It is not officially supported by the project. You are running a
imp> binary compiled on a newer version of the system on an older version
imp> of the system. This has sometimes worked in the past, but is outside
imp> the area that's expected to work. There's been a number of breakages
imp> similar to this in past RELENG branches (there was one in 3.x and a
imp> lot on 4.x).
Yes, I believe running RELENG_6 binary on RELENG_6_1 is not supported
by the project.
imp> Having said that, can someone track down the problem in more detail to
imp> see if there might not be something we can do to mitigate the problem
imp> in the older versions? What is __res_state?
__res_state is a function to initialize actual _res variable. The
users usually use _res. _res is substituted with __res_state by the
macro defined in resolv.h to support multi thread application.
Though it used to be ___res, it is replaced by __res_state during
resolver update. We have compatibility cruft for ___res to keep ABI
backward compatibility.
Sincerely,
--
Hajimu UMEMOTO @ Internet Mutual Aid Society Yokohama, Japan
ume@mahoroba.org ume@{,jp.}FreeBSD.org
http://www.imasy.org/~ume/
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