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From:	"Nicholas Peters" <nickapeters AT hotmail DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Linking Cygwin & MSVC objects / libraries using MSVC linker
Date:	Mon, 23 Apr 2001 19:59:18 -0500
Mime-Version:	1.0
Message-ID:	<F211up7IpGwC6RZT26X00007366@hotmail.com>
X-OriginalArrivalTime:	24 Apr 2001 00:59:19.0034 (UTC) FILETIME=[CAA4FDA0:01C0CC59]

Is it possible to link Cygwin compiled objects and Microsoft Visual C (not 
C++) objects using the libcygwin.a and it's associated libraries  and 
Microsofts various libraries (MSVCRT, etc).  I would very much like to use 
the MSVC linker for this (not ld) but am open to all ideas.  When I tried  
to just flat out link (with MSVC linker) I got some errors from libcygwin.a 
stating it had undefined external references to data_start, data_end, 
bss_start, bss_end.  After reading through some of the mail archives for 
this list I decided to throw in some null char declarations for those 
references since I'm not using the fork functionality of libcygwin.  I get 
two warnings in the link, and the resulting exe crashes.

The warnings are:
libcygwin.a : warning multiple ".idata" sections found with different 
attributes.

libcygwin.a : warning __fmode already defined in MSVCRT.LIB second 
definition ignored.

When I list libcygwin.a BEFORE MSVCRT in my link command line, the second 
warning changes to:

MSVCRT.LIB : warning _atexit already defined in libcygwin.a second 
definition ignored.

Either way the the produced executable crashes with "The instruction at 
<address> referenced memory at <address>.  The memory could not be "read". "

A message in the archives had a similar problem:

http://sources.redhat.com/ml/cygwin/1997-12/msg00071.html

but the author didn't get a reply as far as I can tell, so I thought I'd try 
my luck. If you need more info just let me know, any help is appreciated.

                                      Nick Peters

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