vl: deprecate -watchdog

-watchdog is the same as -device except that it is case insensitive (and it
allows only watchdog devices of course).  Now that "-device help" can list
as such the available watchdog devices, we can deprecate it.

Note that even though -watchdog tries to be case insensitive, it fails
at that: "-watchdog i6300xyz" fails with "Unknown -watchdog device",
but "-watchdog i6300ESB" also fails (when the generated -device option
is processed) with an error "'i6300ESB' is not a valid device model name".
For this reason, the documentation update does not mention the case
insensitivity of -watchdog.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

docs/about/deprecated.rst

@@ -160,6 +160,11 @@ Use ``-display sdl`` instead.
 
 Use ``-display curses`` instead.
 
+``-watchdog`` (since 6.2)
+'''''''''''''''''''''''''
+
+Use ``-device`` instead.
+
 ``-smp`` ("parameter=0" SMP configurations) (since 6.2)
 '''''''''''''''''''''''''''''''''''''''''''''''''''''''
 

softmmu/vl.c

@@ -3256,6 +3256,7 @@ void qemu_init(int argc, char **argv, char **envp)
                     error_report("only one watchdog option may be given");
                     exit(1);
                 }
+                warn_report("-watchdog is deprecated; use -device instead.");
                 watchdog = optarg;
                 break;
             case QEMU_OPTION_action: