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Date: Thu, 8 Sep 2005 09:59:50 -0400 (EDT)
From: Igor Pechtchanski <pechtcha AT cs DOT nyu DOT edu>
Reply-To: cygwin AT cygwin DOT com
To: Julian Hall <jules AT meridiandigital DOT co DOT uk>
cc: cygwin AT cygwin DOT com
Subject: Re: Strange crash in -mno-cygwin DLL
In-Reply-To: <431FEDBA.1060204@meridiandigital.co.uk>
Message-ID: <Pine.GSO.4.63.0509080958410.11417@slinky.cs.nyu.edu>
References: <431FEDBA DOT 1060204 AT meridiandigital DOT co DOT uk>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII

On Thu, 8 Sep 2005, Julian Hall wrote:

> Hi,
>
> I'm compiling a library I've had working as a static library for a while
> into a dll using 'g++ -mno-cygwin'.  The compile works fine, and I'm
> able to link an app to it, but the app crashes with the message
> 'Application failed to initialize (C0000005)'.  I've tried single
> stepping, but in order to get anywhere I've had to set a breakpoint on
> the DLL entry point '*0x10010000' and use 'stepi' through the
> instructions I don't have debug information for.  The crash is happening
> within a call to AddAtomA from the function __w32_sharedptr_set.  The
> last few instructions to execute are:
>
> 10016c96:       89 45 e0                mov    %eax,0xffffffe0(%ebp)
> 10016c99:       a1 8c 5a 02 10          mov    0x10025a8c,%eax
> 10016c9e:       89 45 e4                mov    %eax,0xffffffe4(%ebp)
> 10016ca1:       a1 90 5a 02 10          mov    0x10025a90,%eax
> 10016ca6:       89 45 e8                mov    %eax,0xffffffe8(%ebp)
> 10016ca9:       a1 94 5a 02 10          mov    0x10025a94,%eax
> 10016cae:       89 45 ec                mov    %eax,0xffffffec(%ebp)
> 10016cb1:       a1 98 5a 02 10          mov    0x10025a98,%eax
> 10016cb6:       89 45 f0                mov    %eax,0xfffffff0(%ebp)
> 10016cb9:       a1 9c 5a 02 10          mov    0x10025a9c,%eax
> 10016cbe:       89 45 f4                mov    %eax,0xfffffff4(%ebp)
> 10016cc1:       8d 45 b8                lea    0xffffffb8(%ebp),%eax
> 10016cc4:       89 04 24                mov    %eax,(%esp)
> 10016cc7:       e8 34 10 00 00          call   10017d00 <_AddAtomA AT 4>
>
> Does anyone have any idea what might be causing this failure?  As far as
> I can tell, all of this is happening *before* msvcrt.dll initialises;
> could that be the problem?  If so, how do I ensure that msvcrt.dll
> initialises first?

The fact that you're using -mno-cygwin puts you in MinGW land.  Cygwin gcc
provides a MinGW cross-target as a convenience, but all questions about
the usage of -mno-cygwin should go to the MinGW-users list.
HTH,
	Igor
-- 
				http://cs.nyu.edu/~pechtcha/
      |\      _,,,---,,_		pechtcha AT cs DOT nyu DOT edu
ZZZzz /,`.-'`'    -.  ;-;;,_		igor AT watson DOT ibm DOT com
     |,4-  ) )-,_. ,\ (  `'-'		Igor Pechtchanski, Ph.D.
    '---''(_/--'  `-'\_) fL	a.k.a JaguaR-R-R-r-r-r-.-.-.  Meow!

If there's any real truth it's that the entire multidimensional infinity
of the Universe is almost certainly being run by a bunch of maniacs. /DA

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