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Date: Fri, 04 May 2012 19:58:16 -0600
From: Ryan Johnson <ryan DOT johnson AT cs DOT utoronto DOT ca>
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To: cygwin AT cygwin DOT com
Subject: Re: gdb problem
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On 04/05/2012 1:19 PM, Ken Brown wrote:
> On 5/3/2012 11:10 PM, Christopher Faylor wrote:
>> On Thu, May 03, 2012 at 04:05:04PM -0400, Ken Brown wrote:
>>> On 10/23/2011 5:47 PM, Ken Brown wrote:
>>>> On 10/23/2011 3:04 PM, Christopher Faylor wrote:
>>>>> On Sat, Oct 22, 2011 at 04:37:55PM -0400, Ken Brown wrote:
>>>>>> The attached testcase illustrates a problem with `gdb -i=mi'. I've
>>>>>> tested both gdb 7.3.50-1 and 7.3.50-2, with cygwin 1.7.9 as well 
>>>>>> as with
>>>>>> several recent snapshots (including 2011-10-22).
>>>>>>
>>>>>> Under some circumstances, if gdb -i=mi is started and given several
>>>>>> input lines at once, it only prints part of the output before 
>>>>>> stopping.
>>>>>> I've been able to reproduce this once in a while while working
>>>>>> interactively (by copying and pasting the whole bunch of input 
>>>>>> lines);
>>>>>> in this case one can press Return to get the rest of the output. But
>>>>>> the problem happens consistently with the attached test case, 
>>>>>> which runs
>>>>>> gdb in a subprocess. One has to kill the gdb process before the main
>>>>>> program exits.
>>>>>>
>>>>>> The STC runs as expected on Linux.
>>>>>
>>>>> Thanks for the STC. I had to tweak it to actually see how it was 
>>>>> supposed
>>>>> to work on Linux since only a limited number of lines from the pty 
>>>>> were
>>>>> being output. I've included the revised test case below.
>>>>>
>>>>> I made a simple change to Cygwin which will probably cause subtle
>>>>> problems somewhere down the line. At least for now it seems to 
>>>>> make gdb
>>>>> operate as expected.
>>>>>
>>>>> I'm building a new snapshot now.
>>>>
>>>> Thanks, that fixes it (as well as the emacs problem that originally 
>>>> led
>>>> to this report). In case there are emacs users wondering what this is
>>>> about, I've been testing emacs-24, which uses gdb -i=mi instead of the
>>>> obsolete gdb --annotate=3 used by emacs-23.
>>>
>>> I'm replying to this old thread because the problem is back again in
>>> cygwin-1.7.14-2.  I haven't checked to see exactly when it first
>>> reappeared (but I'll do this if it would help.)  The same STC as before
>>> exhibits the problem; I'm attaching it for convenience.
>>
>> Thanks for the heads up.  This should be fixed in the next snapshot.
>
> Confirmed.  Thanks.
>
> Ryan, if you're reading this, the problems you were seeing with M-x 
> gdb in emacs should be fixed now.
Sorry, do you mean the problems with emacs-23 -annotate=3 or emacs-24 -mi?

Ryan


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