Commit: readelf: decode LTO symbol tables

[Nick Clifton]

Hi Guys,

  Whilst working on a problem with the lto-plugin I noticed that we do
  not have any way of displaying the contents of LTO symbol table
  sections.  We can use nm or objdump with the plugin enabled, but this
  shows us the translated version of the symbol tables, not the
  original.

  So I am applying the attached patch to add a new option to readelf:
  --lto-syms  When used it displays the contents of any LTO symbol
  tables in the provided files.  (I had originally planned to extend the
  --syms option so that it could take argument indicating the kind of
  symbols to display, eg --syms=lto, but this proved to be too
  disruptive to the codebase, so I went with a new command line option
  instead).

  The patch also handles v1 symbol extension table sections, if they
  exist.

Cheers
  Nick

binutils/ChangeLog
2020-10-19  Nick Clifton  <nickc@redhat.com>

	* readelf.c (do_lto_syms): New local.
	(long_option_values): Add OPTION_LTO_SYMS.
	(options): Add --lto-syms.
	(usage): Mention the new option.
	(parse_args): Parse the new option.
	(get_lto_kind): New function.
	(get_lto_visibility): New function.
	(get_lto_sym_type): New function.
	(display_lto_symtab): New function - displays the contents of an
	LTo symbol table section.
	(process_lto_symbol_tables): New functions.  Calls
	dipslay_lto_symtab on any LTO symbol table section.
	(process_object_file): Call process_lto_symbol_tables.
	* doc/binutils.texi: Document the new option.
	* NEWS: Mention the new feature.

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