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Message-ID: <53CE604D.1070309@dronecode.org.uk>
Date: Tue, 22 Jul 2014 13:59:57 +0100
From: Jon TURNEY <jon DOT turney AT dronecode DOT org DOT uk>
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To: cygwin AT cygwin DOT com
Subject: Re: Core dump on 32-bit Cygwin if program calls dlopen
References: <20140715090259 DOT GB20640 AT calimero DOT vinschen DOT de> <53C51460 DOT 5080805 AT cornell DOT edu> <20140715130829 DOT GK10401 AT calimero DOT vinschen DOT de> <53C532D9 DOT 7050506 AT gmail DOT com> <20140715143915 DOT GA8330 AT calimero DOT vinschen DOT de> <20140716070231 DOT GA25020 AT calimero DOT vinschen DOT de> <53C6F68A DOT 9000801 AT gmail DOT com> <20140717073734 DOT GA15332 AT calimero DOT vinschen DOT de> <53C7EC48 DOT 5060903 AT dronecode DOT org DOT uk> <20140717182429 DOT GS15332 AT calimero DOT vinschen DOT de> <20140722082711 DOT GA22860 AT calimero DOT vinschen DOT de>
In-Reply-To: <20140722082711.GA22860@calimero.vinschen.de>
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On 22/07/2014 09:27, Corinna Vinschen wrote:
> On Jul 17 20:24, Corinna Vinschen wrote:
>> On Jul 17 16:31, Jon TURNEY wrote:
>>> On 17/07/2014 08:37, Corinna Vinschen wrote:
>>>> It's the libgcc DLL which gives us grief, so a new libgcc package is
>>>> sufficent, afaics.  We should check if this DLL fixes the problem and
>>>> then make it "curr" soon, I think.
>>>
>>> I briefly tested this other patch with my test case from the mail above, and
>>> it doesn't seem to help.
>>> [...]
>> I asked DJ to take another look, but I guess ultimately we need the
>> attention of one of the GCC Windows maintainers.  Kai Tietz seems to be
>> unavailable right now, unfortunately.
>
> Looks like I totally misunderstood DJ's patch.  The patch does *not*
> change libgcc, it changes cygmin-crtbegin.c, thus the crtbegin.o file
> which is statically linked into the executable.
>
> That means, to fix the issue, you don't have to replace libgcc, you
> have to recompile the executable against the new crtbegin.o.
>
> DJ still claims his patch is the correct one.  The simple testcase
> dlopen'ing cyggs-9.dll works fine with the new crtbegin.o, according to
> him.

Sorry, I hadn't tested it correctly.

Building my test with an updated crtbegin.o as well, my test case is fixed.

I agree this patch seems better than my suggested one, as it makes 
crtbegin do the right thing in the face of unbalanced libgcc 
load/unload, rather than attempting to balance the libgcc load/unload as 
mine does.


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