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Subject: Re: gdb 7.11.1-2 started within emacs fails
To: cygwin AT cygwin DOT com
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From: Ken Brown <kbrown AT cornell DOT edu>
Message-ID: <9fbef412-169a-48fd-362e-249e0b585481@cornell.edu>
Date: Wed, 11 Oct 2017 16:32:53 -0400
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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.

Ken

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