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Date: Thu, 7 Aug 2014 18:57:53 +0200
From: Tijl Coosemans <tijl@FreeBSD.org>
To: Vsevolod Stakhov <vsevolod@FreeBSD.org>
Subject: Re: svn commit: r364287 - head/ports-mgmt/pkg-devel
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Cc: svn-ports-head@freebsd.org, svn-ports-all@freebsd.org,
 Matthias Andree <matthias.andree@gmx.de>, ports-committers@freebsd.org
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On Thu, 07 Aug 2014 17:44:57 +0100 Vsevolod Stakhov wrote:
> On 07/08/14 17:40, Matthias Andree wrote:
>> Am 07.08.2014 um 18:08 schrieb Vsevolod Stakhov:
>>> Due to mainly [2] there are a lot of broken deps, for example, libxml2
>>> provides libxml2.so.2.12, whilst all dependant ports requires
>>> libxml2.so.2. Consequently, some weird packages, such as wine-i386-devel
>>> are installed, since it pretends to provide libxml2.so.2 and due to [3]
>>> and [1] wine is treated as a provide candidate.
>> 
>> The library's SONAME should be the canonical name because that gets
>> recorded in another library's or executable's NEEDED tag, and pkg might
>> be able to check at package creation, and again before install, if a
>> file installing a library also installs a file that matches the SONAME.
> 
> That is how it works for shared lib requires. But that is not how it
> works for shared lib provides. And this ambiguity is the source of [3].

Matthias is talking about the SONAME Elf field.  For libxml2.so.2.9.1
it gives:

% objdump -p /usr/local/lib/libxml2.so.2.9.1  | grep SONAME
  SONAME      libxml2.so.2

This is what is recorded in the NEEDED field of programs/libraries
that depend on libxml2 and can be used for shared lib provides.