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Subject: Re: gdb 7.11.1-2 started within emacs fails
To: The Cygwin Mailing List <cygwin@cygwin.com>
References: <d4a9e76c90c44c7cb0fa915a2589c0f6@vsrv060ex03.ssd.fsi.com> <207e93bf-8f7e-57a3-1abc-cc645c79020c@cornell.edu> <9bed0b67-2930-ee6b-8361-4bf4d9d7d542@dronecode.org.uk> <9fbef412-169a-48fd-362e-249e0b585481@cornell.edu>
From: Jon Turney <jon.turney@dronecode.org.uk>
Message-ID: <934635e9-edcd-9668-76e1-b237efc918ff@dronecode.org.uk>
Date: Thu, 12 Oct 2017 18:24:09 +0100
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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.

[1] https://sourceware.org/bugzilla/show_bug.cgi?id=21078


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