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[Octave-bug-tracker] [bug #59100] "__debug_octave__" doesn't work on Win

From: Markus Mützel
Subject: [Octave-bug-tracker] [bug #59100] "__debug_octave__" doesn't work on Windows
Date: Sat, 12 Sep 2020 05:10:08 -0400 (EDT)
User-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.102 Safari/537.36 Edg/85.0.564.51


                 Summary: "__debug_octave__" doesn't work on Windows
                 Project: GNU Octave
            Submitted by: mmuetzel
            Submitted on: Sat 12 Sep 2020 11:10:06 AM CEST
                Category: Octave Function
                Severity: 2 - Minor
                Priority: 5 - Normal
              Item Group: None
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
                 Release: 6.0.90
         Discussion Lock: Any
        Operating System: Microsoft Windows



IIUC, running "__debug_octave__" on Windows should open an msys2 shell with a
running gdb that is attached to the Octave process.
Instead, gdb seems to execute shortly with some output in Octave's command

>> __debug_octave__
GNU gdb (GDB) 9.2
Copyright (C) 2020 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

"gdb" does not seem to run after that.

This is just an internal, undocumented function. And it doesn't look like any
harm is done. But it would still be nice if this could work as intended.

If I remove "async" from the "system" function arguments, it seems to work as
Contrary to expectations, "gdb" seems to have started asynchronously (i.e. not
blocking Octave).
Also, the second output argument isn't set:

>> [status, output] = system('start gdb', false)
status = 0
error: element number 2 undefined in return list

Maybe an error in the "system" function on Windows?


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