Commit: Add initial support for .debug_sup sections

[Nick Clifton]

Hi Guys,

  I am checking in the attached patch to add initial support for the
  DWARF-5 .debug_sup section to readelf & objdump.  The patch allows
  the contents of the new section to be dumped with the
  --debug-dump=links option, and followed with the --debug-dump=follow
  option.  (Or automatically now that this last option is enabled by
  default).

  The patch recognizes the new DW_FORM_ref_sup4, DW_FORM_ref_sup8 and
  DW_FORM_strp_sup forms, but it does not process them correctly at
  the moment.  This will be the subject of a follow-up patch.

Cheers
  Nick

binutils/ChangeLog
2021-02-25  Nick Clifton  <nickc@redhat.com>

	* dwarf.c (get_type_abbrev_from_form): Accept but ignore sup
	forms.
	(read_and_display_attr_value): Handle sup forms.
	(display_debug_sup): New function.  Displays the contents of a
	.debug_sup section.
	(load_debug_sup_file): New function.  Loads the contents of a file
	referenced by a .debug_sup section.
	(check_for_and_load_links): Call load_debug_sup_file.
	(debug_displays): Add entry for .debug_sup.
	* dwarf.h (enum dwarf_section_display_enum): Add debug_sup.
	* readelf.c (process_section_headers): Add support for debug_sup.
	* doc/debug.options.texi: Note that the =links option will display
	the contents of .debug_sup sections.
	* NEWS: Mention the new support.

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