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From:	"Dave Korn" <dk AT artimi DOT com>
To:	"'Cygwin List'" <cygwin AT cygwin DOT com>
Subject:	RE: DLL generation under Cygwin
Date:	Wed, 5 May 2004 11:57:00 +0100
MIME-Version:	1.0
In-Reply-To:	<20040504192243.61771.qmail@web12102.mail.yahoo.com>
Message-ID:	<NUTMEGR6mJB526tr5Xs0000019a@NUTMEG.CAM.ARTIMI.COM>
X-OriginalArrivalTime:	05 May 2004 10:57:00.0781 (UTC) FILETIME=[B13291D0:01C4328F]

> -----Original Message-----
> From: cygwin-owner On Behalf Of Ted Yu
> Sent: 04 May 2004 20:23

> Hi, Larry:
> If I use your flag, I got the following:
> ld: warning: cannot find entry symbol fftEntry AT 12;
> defaulting to 10001000
> djbfft2d.o(.text+0x4d3):djbfft2d.cpp: undefined
> reference to `_imp___iob'
> djbfft2d.o(.text+0x50a):djbfft2d.cpp: undefined
> reference to `_imp___iob'

  This looks to me like you only re-tried the link stage; you need to
rebuild all the .o files from scratch using -mno-cygwin as well, otherwise
they'll still have references to cygwin stuff.


> BTW, I have this function:
> int __stdcall fftEntry(HINSTANCE h, unsigned long a,
> void * b)
> Why is ld complaining that fftEntry AT 12 cannot be found ?

  Because gcc uses a different name-mangling scheme to msvc.

  Without knowing anything about your makefile or command line options, it's
a bit hard to give any more specific advice.  However I highly recommend you
read the "Programming Questions" section of the cygwin faq at
http://cygwin.com/faq/faq_4.html#SEC88, and the "Programming with Cygwin"
section of the userguide at
http://cygwin.com/cygwin-ug-net/programming.html, both of which contain lots
of advice about building dlls under cygwin.


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


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