Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Subscribe: <mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive: <http://sourceware.org/ml/cygwin/>
List-Post: <mailto:cygwin AT cygwin DOT com>
List-Help: <mailto:cygwin-help AT cygwin DOT com>, <http://sourceware.org/ml/#faqs>
Sender: cygwin-owner AT cygwin DOT com
Mail-Followup-To: cygwin AT cygwin DOT com
Delivered-To: mailing list cygwin AT cygwin DOT com
Message-ID: <00ef01c46443$b813fa80$5308a8c0@robinson.cam.ac.uk>
From: "Max Bowsher" <maxb AT ukf DOT net>
To: "Dave Korn" <dk AT artimi DOT com>
Cc: "'Cygwin List'" <cygwin AT cygwin DOT com>
References: <NUTMEGMWIGTjkifTNRM0000075b AT NUTMEG DOT CAM DOT ARTIMI DOT COM>
Subject: Re: Building DLL
Date: Wed, 7 Jul 2004 17:59:03 +0100
MIME-Version: 1.0
Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
X-IsSubscribed: yes

Dave Korn wrote:
>> -----Original Message-----
>> From: cygwin-owner On Behalf Of Gerrit P. Haase
>> Sent: 07 July 2004 17:35
> 
>> Maarten wrote:
> 
>> which needs to
>>> be built as a shared library. Dbh uses libtool in its build process.
>> 
>>> Of course this complains with
>> 
>>>         libtool: link: warning: undefined symbols not allowed in
>>>         i686-pc-cygwin shared libraries
>> 
>>> As far as I know, to get this to build I need to create a
>> .def file, and
>>> somehow include this in the libtool invocation.
>> 
>>> Are there some general hints to determine which
>> functions/symbols need
>>> to be included in this .def file, and how to modify the libtool
>>> invocation to use this file?
>> 
>> You don't need .def files on Cygwin.  Just add -no-undefined to
>> libxyz_LDFLAGS.
> 
>   Do you perhaps mean "--allow-shlib-undefined"?  A quick glance at the ld
> --help output suggests that's more like what's needed, isn't it?

No.

-no-undefined is what is required here, and it is a libtool flag, not a ld flag.

Windows simply doesn't allow for undefined symbols in shlibs, and there is nothing ld can do about it.

Max.


--
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple
Problem reports:       http://cygwin.com/problems.html
Documentation:         http://cygwin.com/docs.html
FAQ:                   http://cygwin.com/faq/