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ui/console: Note in '-display help' that some backends support suboptions

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Currently '-display help' only prints the available backends. Some
of those backends support suboptions (e.g. '-display gtk,gl=on').
Mention that in the help output, and point the user to where they
might be able to find more information about the suboptions.
The new output looks like this:

  $ qemu-system-aarch64 -display help
  Available display backend types:
  none
  gtk
  sdl
  egl-headless
  curses
  spice-app
  dbus

  Some display backends support suboptions, which can be set with
     -display backend,option=value,option=value...
  For a short list of the suboptions for each display, see the top-level -help output; more detail is in the documentation.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Acked-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-ID: <20240731154136.3494621-4-peter.maydell@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
This commit is contained in:
Peter Maydell 2024-07-31 16:41:36 +01:00 committed by Philippe Mathieu-Daudé
parent 7aea035a60
commit ef0a1212c9
1 changed files with 5 additions and 0 deletions
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5
ui/console.c
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@ -1632,4 +1632,9 @@ void qemu_display_help(void)
printf("%s\n", DisplayType_str(dpys[idx]->type));
}
}
printf("\n"
"Some display backends support suboptions, which can be set with\n"
" -display backend,option=value,option=value...\n"
"For a short list of the suboptions for each display, see the "
"top-level -help output; more detail is in the documentation.\n");
}