From: "Dmitry V. Levin" <ldv@altlinux.org>
To: ALT Devel discussion list <devel@lists.altlinux.org>
Subject: Re: [devel] Q: Переименование символов и сохранение ABI
Date: Sun, 6 Jun 2010 15:06:52 +0400
Message-ID: <20100606110652.GA27785@wo.int.altlinux.org> (raw)
In-Reply-To: <20100606070929.GC22655@altlinux.org>
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On Sun, Jun 06, 2010 at 11:09:29AM +0400, Alexey I. Froloff wrote:
> Апстрим librep переименовал несколько символов не меняя SONAME.
> Хочется сохранить ABI. Раньше оно выглядело так:
>
> $ nm -D /usr/lib/librep.so.9.5.0 | grep file_uid
> 000168e0 T Ffile_uid_p
> 000547c8 B Qfile_uid_p
>
> Собсно, убрали "_p". Код раскрывается в следующее:
>
> repv Qfile_uid;
> repv Ffile_uid(repv arg) { ... }
>
> Делаю alias'ы:
>
> extern __typeof__ (Ffile_uid) Ffile_uid_p __attribute__ ((alias ("Ffile_uid")));
> extern __typeof__ (Qfile_uid) Qfile_uid_p __attribute__ ((alias ("Qfile_uid")));
>
>
> С функцией такой трюк проходит, а с common symbol нет:
>
> {standard input}:6039: Error: `Qfile_uid_p' can't be equated to common symbol 'Qfile_uid'
>
> У этой библиотеки полтора пользователя, но хотелось бы знать как
> в принципе решать подобные проблемы.
Достаточно превратить common symbol в (un)initialized data.
При этом конструкция вида "int i;" заменяется на "int i = 0;".
--
ldv
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next prev parent reply other threads:[~2010-06-06 11:06 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-06 7:09 Alexey I. Froloff
2010-06-06 11:06 ` Dmitry V. Levin [this message]
2010-06-06 17:13 ` Alexey I. Froloff
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