GNAT.Command_Line and -?

[rrr.eee.27@gmail.com]

In a new project I'd like to use some command line parameters. Among others I have defined:

with GNAT.Command_Line;            use GNAT.Command_Line;

...

Cfg_Pub : Command_Line_Configuration;

...

Define_Switch (Cfg_Pub, Server_Name_Text'Access, "-h:",
               Long_Switch => "--host=",
               Argument    => "FQN|IP",
               Help        => "server name or IP address (default: localhost).");

...

Define_Switch (Cfg_Pub, "-?", Long_Switch => "--help", Help => "show this text");


Using "-?" as a Switch always raises the exception Invalid_Switch. This is probably due to the question mark serving as an indicator of an optional argument.  I don't want to use "-h" for help as that is already used for the host parameter.

Is there a way to define -? as a valid command line option without returning to Ada.Command_Line?

regards
    Rolf