Simply redefine the prefix: 
use Getopt::Long;

Getopt::Long::Configure('prefix_pattern=(?:--|-)?');

$rv = GetOptions(
   'help|h!'    => \$help,
   'b!'         => \$backup,
   'u!'         => \$upd_sybase,
   's!'         => \$silent,
   'update'     => \$update,
   'server=s'   => \$server,
   'user=s'     => \$user,
   'password=s' => \$password,
);

push(@args, $help       ? "--help" : "--nohelp") if defined $help;
push(@args, $backup     ? "--b"    : "--nob"   ) if defined $backup;
push(@args, $upd_sybase ? "--u"    : "--nou" ) if defined $upd_sybase;
push(@args, $silent     ? "--s"    : "--nos"   ) if defined $silent;
push(@args, "update"                           ) if defined $update;
push(@args, "server=$server"                   ) if defined $server;
push(@args, "user=$user"                       ) if defined $user;
push(@args, "password=$password"               ) if defined $password;

print(join(' ', @args), $/);

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In reply to Re: Mixing command line arguments by ikegami
in thread Mixing command line arguments by Anonymous Monk

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