I would go the other route. Rather than making your caller create an array reference, have your subroutine do it:

  sub addHost {
    my $host = shift;
    print "$host\n";
    $getSSO{$host} = [ @_ ];
  }

  # now this will work as is
  addHost('aklia700', qw(carrot lunch));

  # and it's also slightly simpler when you have a named array
  my @a = qw(carrot lunch);
  addHost('aklia700', @a);
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Update: fixed bug in subroutine. Old code was shifting after the anonymous array had been constructed.