qemu-options: Mark -virtioconsole as deprecated

The qemu-doc already states that this option is only maintained for
backward compatibility and "-device virtconsole" should be used
instead. So let's take the next step and mark this option officially
as deprecated.
Reviewed-by: NMarkus Armbruster <armbru@redhat.com>
Signed-off-by: NThomas Huth <thuth@redhat.com>
Message-Id: <1525446790-16139-1-git-send-email-thuth@redhat.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

qemu-doc.texi

@@ -2931,6 +2931,11 @@ The @code{-localtime} option has been replaced by @code{-rtc base=localtime}.
 
 The @code{-startdate} option has been replaced by @code{-rtc base=@var{date}}.
 
+@subsection -virtioconsole (since 2.13.0)
+
+Option @option{-virtioconsole} has been replaced by
+@option{-device virtconsole}.
+
 @section qemu-img command line arguments
 
 @subsection convert -s (since 2.0.0)

qemu-options.hx

@@ -3675,10 +3675,7 @@ STEXI
 @item -virtioconsole @var{c}
 @findex -virtioconsole
 Set virtio console.
-
-This option is maintained for backward compatibility.
-
-Please use @code{-device virtconsole} for the new way of invocation.
+This option is deprecated, please use @option{-device virtconsole} instead.
 ETEXI
 
 DEF("show-cursor", 0, QEMU_OPTION_show_cursor, \

vl.c

@@ -3587,6 +3587,8 @@ int main(int argc, char **argv, char **envp)
                 }
                 break;
             case QEMU_OPTION_virtiocon:
+                warn_report("This option is deprecated, "
+                            "use '-device virtconsole' instead");
                 add_device_config(DEV_VIRTCON, optarg);
                 default_virtcon = 0;
                 if (strncmp(optarg, "mon:", 4) == 0) {