Probleme de debug sous GDB

Bonjour

je suis très débutant en GDB et je sollicite votre aide.

Je travail sur un émulateur sous QEMU, et j'ai besoin de le debug. Après avoir compilé le code recupere sur internet je l'ai compilé. L'emus fonctionne exactement comme prévu (il s'agit d'un prototype).
Je travaille avec MSYS 64 bit.

Dans la fenetre MinGW MSYS 64 bit l'instruction pour lancer l'emus:

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./qemu-system-xbox -cpu pentium3 -machine xbox,short_animation,bootrom=mcpx_rom.bin -m 128 -drive file=xbox_outrun_2.qcow2,index=0,media=disk,locked=on -drive index=1,media=cdrom -bios xbox_bios.bin -usb -device usb-hub,bus=usb-bus.0,port=3 -device usb-xbox-gamepad,bus=usb-bus.0,port=3.2 -s -S

Puis j'ouvre une seconde fenetre et je rentre les instruction pour debug sous gdb:

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gdb -ex 'target remote :1234' -ex 'c'

mais j'ai droit a c emessage:

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$ gdb -ex 'target remote :1234' -ex 'c'
GNU gdb (GDB) 8.0
Copyright (C) 2017 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.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-w64-mingw32".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word".
:1234: Aucune connexion n▒a pu ▒tre ▒tablie car l▒ordinateur cible l▒a express▒ment refus▒e.
The program is not being run.
(gdb)

Un autre probleme lorsque je lance la commande:

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 /usr/bin/gdb.exe -v

j'ai ceci:

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 /usr/bin/gdb.exe -v
GNU gdb (GDB) 7.11.1
Copyright (C) 2016 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.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-pc-msys".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word".

Auriez vus une idée SVP?

Merci