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From: "Dave Korn" <dk AT artimi DOT com>
To: <cygwin AT cygwin DOT com>
Subject: RE: Problem linking with ODBC
Date: Thu, 19 Aug 2004 10:28:41 +0100
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In-Reply-To: <loom.20040818T214320-21@post.gmane.org>
Message-ID: <NUTMEGyLyGqOs28evcM00000e49@NUTMEG.CAM.ARTIMI.COM>
X-OriginalArrivalTime: 19 Aug 2004 09:28:41.0484 (UTC) FILETIME=[EA5B84C0:01C485CE]

> -----Original Message-----
> From: cygwin-owner On Behalf Of da
> Sent: 18 August 2004 20:48

> I'm getting undefined references when trying to link with 
> libodbc32.a that comes with cygwin:
> 
> ---
> 
> Building target: libTest.so
> g++ -shared -o libTest.so testdb.o -lodbc32
> testdb.o(.text+0x40): In function `_Z3foov':
> /cygdrive/c/Projects/test/source/Debug/../testdb.cpp:7: 
> undefined reference to 
> `_SQLConnect'
> collect2: ld returned 1 exit status
> make: *** [libTest.so] Error 1
> 
> ---
> 
> Any idea why _SQLConnect is unresolved?

  Here's how to find out: use nm to list the library contents and see what's
there.

dk AT mace /artimi> nm /lib/w32api/libodbc32.a  | grep SQLConnect
00000000 T _SQLConnectW AT 28
00000000 I __imp__SQLConnectW AT 28
00000000 T _SQLConnectA AT 28
00000000 I __imp__SQLConnectA AT 28
00000000 T _SQLConnect AT 28
00000000 I __imp__SQLConnect AT 28
dk AT mace /artimi>

  It seems it's not matching because the symbol is decorated.  There's an ld
option to deal with this:

  --enable-stdcall-fixup             Link _sym to _sym AT nn without warnings

  To pass it through the g++ command line, you'll need to prefix it with
-Wl, so try it like this:

> g++ -Wl,--enable-stdcall-fixup -shared -o libTest.so testdb.o -lodbc32

    cheers, 
      DaveK
-- 
Can't think of a witty .sigline today....


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