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Subject:	Using Sybase DLLs from Cygwin apps
From:	Michael Peppler <mpeppler AT peppler DOT org>
To:	cygwin AT cygwin DOT com
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Date:	Tue, 23 Nov 2004 18:19:33 +0100
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[ Note - I'm a Unix/linux person and know very little about Windows ]

I'm trying to build sqsh under Cygwin and I'm running into a problem
with decorate vs. non-decorated library symbols.

Sybase uses the __stdcall calling convention for its libraries under
Windows, so gcc generates symbols like _ct_results AT 8.

I've gone through the Cygwin docs on linking with Windows DLLs, and I've
generated three .def files and .a files using the following:

cd $SYBASE/OCS-12_5/lib
for i in libblk libcs libct; do
    echo "EXPORTS" >${i}.def
    nm ${i}.lib | grep 'T _' | sed 's/.* T _//' >>${i}.def
    dlltool --dllname ${i}.dll --def ${i}.def --output-lib ${i}.a
done

This generates what looks like valid .a files, *but* they are all with
non-decorated symbols, and of course the link phase fails.

Is there a way to direct the linker to match up the _ct_xxx AT 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.

Michael
-- 
Michael Peppler                              Data Migrations, Inc.
mpeppler AT peppler DOT 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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