invoke.texi (Overall Options): Document --help=.

invoke.texi (Overall Options): Document --help=.

* doc/invoke.texi (Overall Options): Document --help=.
* gcc.c (target_help_flag): Rename to print_subprocess_flag.
  (cc1_options): Pass --help= on to cc1.
  (display_help): Add description of --help=.
  (process_command): Add code to handle --help=.  Allow translated
  --help and --target-help switches to be passed on to compiler sub-process.
  (main): Remove unused if statement.
* opts.c (columns): Remove.
  (LEFT_COLUMN): Define.
  (wrap_help): Add columns argument.
  (print_filtered_help): Change parameters to be an include bitmask,
  an exclude bitmask, an any bitmask and the column width.  Move the
  code to display the params list here.  Add code to display the
  status of options rather than their descriptions if the quiet flag
  is not active.
  (print_specific_help): Change parameters to be an include bitmask,
  an exclude bitmask and an any bitmask.  Move code to look up the
  column width here.  Decide upon the title for an options listing.
  (common_handle_options): Add code to handle --help=.  Adapt code
  for --help and --target-help to use the revised form of the
  print_specific_help function.
  (print_help): Delete.
  (print_param_help): Delete.
  (print_switch): Delete.
* opts.h (cl_lang_count): Add prototype.
 (CL_PARAMS, CL_WARNING, CL_OPTIMIZATION, CL_MIN_OPTION_CLASS, CL_MAX_OPTION_CLASS): New defines.
* optc-gen.awk: Add construction of cl_lang_count.
* c.opt: Add Warning attribute to warning options and Optimization attribute to optimization options.
* common.opt: Likewise.
  Add --help=.
  Add -fhelp and -ftarget-help as aliases for the transformed --help and --target-help options.
* opt-functions.awk: Add code to handle Warning and Optimization attributes.

From-SVN: r121849