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From: Chris Faylor <cgf AT cygnus DOT com>
Date: Sun, 24 Oct 1999 09:37:26 -0400
To: "Charles S. Wilson" <cwilson AT ece DOT gatech DOT edu>
Cc: cygwin AT sourceware DOT cygnus DOT com
Subject: Re: X11R6.4 for Cygwin Release v1.0? (And thanks)
Message-ID: <19991024093725.A7861@cygnus.com>
Reply-To: cygwin AT sourceware DOT cygnus DOT com
Mail-Followup-To: "Charles S. Wilson" <cwilson AT ece DOT gatech DOT edu>,
	cygwin AT sourceware DOT cygnus DOT com
References: <19991023161319 DOT 20604 DOT qmail AT www0w DOT netaddress DOT usa DOT net> <19991023232133 DOT B5735 AT cygnus DOT com> <3812F9AC DOT 78549EE8 AT ece DOT gatech DOT edu>
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In-Reply-To: <3812F9AC.78549EE8@ece.gatech.edu>; from Charles S. Wilson on Sun, Oct 24, 1999 at 08:21:00AM -0400

On Sun, Oct 24, 1999 at 08:21:00AM -0400, Charles S. Wilson wrote:
>
>> 
>> The link errors that you were getting are due to the fact that *object*
>> files and *libraries* are not necessarily compatible.  i don't know
>> about the STATUS_ACCESS_VIOLATION problem, however.
>> 
>
>So *object* files and *libraries* developed using the following
>platforms are mutually incompatible?
>
>1) cygwin-b20.1
>2) recent snapshots
>3) Cygwin CD 1.0
>4) cygwin-b21

We guarantee that a recent cygwin1.dll will work with any program or DLL
which loads it.

We do not guarantee that object files or libraries produced by a
previous version of cygwin/gcc will be usable with a new DLL or cygwin
stub library.  In particular, we may decide to add an additional symbol
to the DLL/stub library for export.

So, if your object file has been using the 'foo' routine from the stub
library and was essentially statically linking it into your program,
it will be confused by the fact that the 'foo' routine is now exported
by the DLL.  That is apparently what is happening here.

The solution is to recompile from source.

I am not going to provide an exhaustive list of what's compatible with
what.  However, it's likely that B20 object files are incompatible with
snapshots or the Cygwin CD.  It's likely that files produced using
snapshots from the last couple of months will work with the Cygwin CD.

In short, if it links, you're ok.  If it doesn't, recompile.

cgf

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