From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <binutils-return-18755-listarch-binutils=sourceware.cygnus.com@sources.redhat.com>
Received: (qmail 8165 invoked by alias); 20 Jun 2002 07:05:42 -0000
Mailing-List: contact binutils-help@sources.redhat.com; run by ezmlm
Precedence: bulk
List-Subscribe: <mailto:binutils-subscribe@sources.redhat.com>
List-Archive: <http://sources.redhat.com/ml/binutils/>
List-Post: <mailto:binutils@sources.redhat.com>
List-Help: <mailto:binutils-help@sources.redhat.com>, <http://sources.redhat.com/ml/#faqs>
Sender: binutils-owner@sources.redhat.com
Received: (qmail 8093 invoked from network); 20 Jun 2002 07:05:35 -0000
Received: from unknown (HELO devserv.devel.redhat.com) (66.187.233.200)
  by sources.redhat.com with SMTP; 20 Jun 2002 07:05:35 -0000
Received: (from jakub@localhost)
	by devserv.devel.redhat.com (8.11.6/8.11.0) id g5K75QR00797;
	Thu, 20 Jun 2002 03:05:26 -0400
Date: Thu, 20 Jun 2002 00:05:00 -0000
From: Jakub Jelinek <jakub@redhat.com>
To: "Zagorodnev, Grigory" <Grigory_Zagorodnev@stl.sarov.ru>
Cc: "'H . J . Lu'" <hjl@lucon.org>,
   "'binutils@sources.redhat.com'" <binutils@sources.redhat.com>
Subject: Re: Shared library question
Message-ID: <20020620030526.X13411@devserv.devel.redhat.com>
Reply-To: Jakub Jelinek <jakub@redhat.com>
References: <51524B6C689ED4118D4F0090273ACE32928849@odyssey.stl.sarov.ru>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
User-Agent: Mutt/1.2.5.1i
In-Reply-To: <51524B6C689ED4118D4F0090273ACE32928849@odyssey.stl.sarov.ru>; from Grigory_Zagorodnev@stl.sarov.ru on Thu, Jun 20, 2002 at 08:44:10AM +0400
X-SW-Source: 2002-06/txt/msg00567.txt.bz2

On Thu, Jun 20, 2002 at 08:44:10AM +0400, Zagorodnev, Grigory wrote:
> >If you'll do:
> >VER_1.0 { global: foo; bar; baz; local: *; };
> >VER_1.1 { } VER_1.0;
> >and .symver __real_foo, foo@VER_1.0
> 
> Thanks a lot!
> I finally understood what is going on here. This approach does work fine.
> The only one question remains:
> 	Is there C-language extension to define symbol version like above?

Of course there is, GCC inline assembly:
# define symbol_version(real, name, version) \
     _symbol_version(real, name, version)
# define default_symbol_version(real, name, version) \
     _default_symbol_version(real, name, version)
# ifdef __ASSEMBLER__
#  define _symbol_version(real, name, version) \
     .symver real, name##@##version
#  define _default_symbol_version(real, name, version) \
     .symver real, name##@##@##version
# else
#  define _symbol_version(real, name, version) \
     __asm__ (".symver " #real "," #name "@" #version)
#  define _default_symbol_version(real, name, version) \
     __asm__ (".symver " #real "," #name "@@" #version)
#endif

Then:

void __real_foo (void)
{
  do something;
}
symbol_version (__real_foo, foo, VER_1.0);

	Jakub