As documented, using multiple --help=<value> options in one command line produces an output that concatenates the output from the various --help=<value> options.
However, using both --help and --help=<value> gives only the --help output, regardless of the order in which they are specified. -- Summary: --help and --help=<value> options cannot be combined. Product: gcc Version: 4.3.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: other AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: brooks at gcc dot gnu dot org http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31357