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Subject: Re: Using Sybase DLLs from Cygwin apps
From: Michael Peppler <mpeppler@peppler.org>
To: cygwin@cygwin.com
In-Reply-To: <20041123172828.GB9927@trixie.casa.cgf.cx>
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Date: Tue, 23 Nov 2004 19:36:52 +0100
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On Tue, 2004-11-23 at 18:28, Christopher Faylor wrote:
> On Tue, Nov 23, 2004 at 06:19:33PM +0100, Michael Peppler wrote:
> >I'm trying to build sqsh under Cygwin and I'm running into a problem
> >with decorate vs. non-decorated library symbols.
> >
> >Is there a way to direct the linker to match up the _ct_xxx@y symbols
> >with the corresponding _ct_xxx entries in the .a/.dll?
> >
> >Building sqsh without the __stdcall calling convention results in a
> >successful link, but the actual calls into the library fails (obviously
> >because the caller and callee don't use the same calling conventions.)
> >
> >Any ideas and suggestions would be appreciated.
> 
> Have you tried just linking directly to the DLL itself, i.e., use the DLL
> on the command line.  This should work for non-data references.

I tried it just now - same result:

gcc      cmd_alias.o ...
... sqsh_sigcld.o sqsh_stdin.o sqsh_strchr.o sqsh_tok.o sqsh_varbuf.o
sqsh_main.o -Lc:/sybase/OCS-12_5/dll -lblk -lcs -lct     -lreadline
-ltermcap  -o sqsh
cmd_bcp.o(.text+0x486): In function `cmd_bcp':
/home/Michael/sqsh-cvs/src/cmd_bcp.c:336: undefined reference to
`_ct_cmd_alloc@8'
...

I've been able to build this with the help of another sqsh user by
generating the .def and .a files based on an older version of the Sybase
libs - and these *have* the decorated versions of the symbols, and this
links and runs fine in my environment (i.e. with the most recent DLLs.)
I guess that as long as the calling sequences for each symbol remains
the same.

Michael
-- 
Michael Peppler                              Data Migrations, Inc.
mpeppler@peppler.org                       http://www.peppler.org/
Sybase T-SQL/OpenClient/OpenServer/C/Perl developer available for short or 
long term contract positions - http://www.peppler.org/resume.html


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