Subject: Re: Building DLL
From: "Max Bowsher" <[email-masked]>
To: "Dave Korn" <[email-masked]>
Cc: "'Cygwin List'" <[email-masked]>
Date: Wed, 7 Jul 2004 17:59:03 +0100

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.

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