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Subject: Re: gdb and core files
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From: Mark Geisert <mark AT maxrnd DOT com>
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Date: Thu, 2 Jul 2020 23:37:40 -0700
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Jon Turney wrote:
> On 30/06/2020 04:24, Mark Geisert wrote:
>> Ken Brown via Cygwin wrote:
>>> On 6/28/2020 9:31 AM, Jon Turney wrote:
>>>> On 28/06/2020 01:50, Ken Brown via Cygwin wrote:
>>>>> Following the instructions at 
>>>>> https://cygwin.com/cygwin-ug-net/using-cygwinenv.html, I tried to create a 
>>>>> core file that I could examine with gdb, but I apparently ran into a gdb 
>>>>> bug. I tried both gdb 9.2-1 and 8.3.1-1.  Here are the results with 9.2-1.
>>>>>
>>>> [...]
>>>>
>>>> Unfortunately, I think dumper doesn't produce anything useful on x86_64. See 
>>>> [1] et seq.
>>>
>>> Thanks.  Sorry I didn't notice that people had asked the same question before.
>>>
>>> We should probably fix the documentation:
>>>
>>>    https://cygwin.com/cygwin-ug-net/using-cygwinenv.html
>>>    https://cygwin.com/cygwin-ug-net/dumper.html
> 
> Yeah, with hindsight, that would have been a good idea.
> 
>> I hesitate to comment when I can't immediately work on this, but, ...making 
>> dumper work on 64-bit Cygwin is on my TODO list but not right at the top.  It 
>> would be helpful to keep the program around in its current 32-bit state as a 
>> template for 64-bit.
> 
> I had a poke at this problem this week.
> 
> [1] https://cygwin.com/pipermail/cygwin-patches/2020q3/010313.html
> [2] https://sourceware.org/pipermail/gdb-patches/2020-July/170023.html

Ow, I've been ninja'd!  Seriously, nice to see this work.  Great!

>> P.S. For the long term, I think it was Jon who suggested dumper generate 
>> Windows minidumps rather than the current Frankensteinish dumps.  I intend to 
>> investigate that when I get to this project.
> 
> Not quite.  There's already a tool ('minidumper') to generate minidumps.  But 
> gdb can't read those (yet).

Appreciate the correction.  I'll check in when I can spend time on this.
Cheers,

..mark

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