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Re: Using Sybase DLLs from Cygwin apps

From: Michael Peppler

To: cygwin at cygwin dot com

Date: Tue, 23 Nov 2004 19:36:52 +0100

Subject: Re: Using Sybase DLLs from Cygwin apps

References:

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.

********@*******.*** 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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