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Subject:	Re: gdb 7.11.1-2 started within emacs fails
To:	cygwin AT cygwin DOT com
References:	<d4a9e76c90c44c7cb0fa915a2589c0f6 AT vsrv060ex03 DOT ssd DOT fsi DOT com> <207e93bf-8f7e-57a3-1abc-cc645c79020c AT cornell DOT edu> <9bed0b67-2930-ee6b-8361-4bf4d9d7d542 AT dronecode DOT org DOT uk> <9fbef412-169a-48fd-362e-249e0b585481 AT cornell DOT edu> <934635e9-edcd-9668-76e1-b237efc918ff AT dronecode DOT org DOT uk>
From:	Ken Brown <kbrown AT cornell DOT edu>
Message-ID:	<97eae61a-1b6c-b54f-4eb9-1f1f84c502fd@cornell.edu>
Date:	Thu, 12 Oct 2017 15:47:51 -0400
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On 10/12/2017 1:24 PM, Jon Turney wrote:
> On 11/10/2017 21:32, Ken Brown wrote:
>> On 10/11/2017 3:44 PM, Jon Turney wrote:
>>> On 27/09/2016 21:15, Ken Brown wrote:
>>>> On 9/27/2016 2:47 PM, Rockefeller, Harry wrote:
>>>>> Using program foo:
>>>>>       program foo
>>>>>       e = 1.0
>>>>>       stop
>>>>>       end
>>>>>
>>>>> $ /usr/bin/gfortran    -g foo.f -o foo
>>>>>
>>>>> Emacs version info: GNU Emacs 25.1.1 (i686-pc-cygwin, GTK+ Version 
>>>>> 3.18.9) of 2016-09-17
>>>>>
>>>>> Inside emacs I ran M-x gud-gdb and got
>>>>> ... GNU gdb (GDB) (Cygwin 7.11.1-2) 7.11.1 ...
>>>>> (gdb) b 1
>>>>> Breakpoint 1 at 0x4011d6: file foo.f, line 1.
>>>>> (gdb) r
>>>>> Starting program: /cygdrive/c/Users/harryr/foo.exe
>>>>> [New Thread 6296.0x22ac]
>>>>> [New Thread 6296.0x24d4]
>>>>> readline: readline_callback_read_char() called with no handler!
>>>>> Debugger aborted (core dumped)
>>>>>
>>>>> Foo written in C++ also fails with the same message.
>>>>> Running gdb foo in bash gives the expected result:
>>>>> gdb stops at first executable line prompting for next gdb command.
>>>>
>>>> I can confirm that this happens also with gdb-7.11.1-1 but not 
>>>> gdb-7.10.1-1.  (I tested on x86_64, since gdb-7.10.1-1 is broken on 
>>>> x86.)
>>>>
>>>> It also fails with M-x gdb instead of M-x gud-gdb, but with a 
>>>> different error message:
>>>>
>>>>    Failed to resume program execution (ContinueDebugEvent failed, 
>>>> error 87)
>>>
>>> These problem seem not longer occur due to upstream changes in gdb 7.12.
>>
>> Everything seems fine on x86_64 and with M-x gud-gdb on x86.  But when 
>> I run M-x gdb on x86 (even with no file), gdb crashes.
> 
> Thanks for testing.
> 
> It seems this issue is known [1], so I made a gdb 7.12.1-2 with the 
> work-around from there applied, which seems to fix M-x gdb on x86.

Confirmed.

Thanks.

Ken


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