Gate the displaying of non-debug sections in separate debuginfo files.

PR 27478
	* objdump.c (process_links): New variable.
	(usage): Add --process-links.
	(long_options): Likewise.
	(dump_bfd): Stop processing once the bfd has been loaded unless
	this is the main file or process_links has been enabled.
	(main): Handle the process-links option.
	* readelf.c (process_links): New variable.
	(struct filedata): Add is_separate field.
	(options): Add --process-links.
	(usage): Likewise.
	(parse_args): Likewise.
	(process_file_header): Include the filename when dumping
	information for separate debuginfo files.
	(process_program_headers): Likewise.
	(process_section_headers): Likewise.
	(process_section_groups): Likewise.
	(process_relocs): Likewise.
	(process_dynamic_section): Likewise.
	(process_version_sections): Likewise.
	(display_lto_symtab): Likewise.
	(process_symbol_table): Likewise.
	(process_syminfo): Likewise.
	(initialise_dumps_by_name): Likewise.
	(process_section_contents): Likewise.
	(process_notes_at): Likewise.
	(process_notes): Likewise.
	(open_file): Add is_separate parameter.  Use to initialise the
	is_separate field in the filedata structure.
	(open_deug): Update call to open_file.
	(process_object): Add processing of the contents of separate
	debuginfo files, gated by the process_links variable.
	(process_archive): Update call to open_file.
	(process_file): Initialise the is_separate field in the filedata
	structure.
	* dwarf.c (load_separate_debug_info_file): Only report the
	loading of a separate file if debug links are being dumped.
	* objcopy.c (keep_section_symbols): New variable.
	(enum command_line_switch): Add OPTION_KEEP_SYMBOLS.
	(strip_options): Add keep-section-symbols.
	(copy_options): Likewise.
	(copy_usage): Likewise.
	(strip_usage): Likewise.
	(copy_object): Keep section symbols if requested by command line
	option.
	(strip_main): Handle --keep-section-symbols.
	(copy_main): Likewise.
	* doc/binutils.texi: Document the new options.
	* NEWS: Mention the new features.
	* testsuite/binutils-all/compress.exp (test_gnu_debuglink):
	Update options passed to objdump.  Use diff rather than cmp to
	compare the dumped data.
	* testsuite/binutils-all/objdump.WK2: Update regexp.
	* testsuite/binutils-all/objdump.WK3: Update regexp.
	* testsuite/binutils-all/objdump.exp: Use --process-links
	instead of --dwarf=follow-links.
	* testsuite/binutils-all/readelf.exp (readelf_test): Include
	readelf's output in the log when the test fails.
	Add the -P option to the -wKis test.
	* testsuite/binutils-all/readelf.wKis: Update expected output.

binutils/objcopy.c

@@ -91,6 +91,7 @@ static int copy_byte = -1;
 static int interleave = 0; /* Initialised to 4 in copy_main().  */
 static int copy_width = 1;
 
+static bfd_boolean keep_section_symbols = FALSE ;/* True if section symbols should be retained.  */
 static bfd_boolean verbose;		/* Print file and target names.  */
 static bfd_boolean preserve_dates;	/* Preserve input file timestamp.  */
 static int deterministic = -1;		/* Enable deterministic archives.  */
@@ -335,6 +336,7 @@ enum command_line_switch
   OPTION_KEEP_FILE_SYMBOLS,
   OPTION_KEEP_SECTION,
   OPTION_KEEP_SYMBOLS,
+  OPTION_KEEP_SECTION_SYMBOLS,
   OPTION_LOCALIZE_HIDDEN,
   OPTION_LOCALIZE_SYMBOLS,
   OPTION_LONG_SECTION_NAMES,
@@ -387,6 +389,7 @@ static struct option strip_options[] =
   {"info", no_argument, 0, OPTION_FORMATS_INFO},
   {"input-format", required_argument, 0, 'I'}, /* Obsolete */
   {"input-target", required_argument, 0, 'I'},
+  {"keep-section-symbols", no_argument, 0, OPTION_KEEP_SECTION_SYMBOLS},
   {"keep-file-symbols", no_argument, 0, OPTION_KEEP_FILE_SYMBOLS},
   {"keep-section", required_argument, 0, OPTION_KEEP_SECTION},
   {"keep-symbol", required_argument, 0, 'K'},
@@ -463,6 +466,7 @@ static struct option copy_options[] =
   {"keep-section", required_argument, 0, OPTION_KEEP_SECTION},
   {"keep-symbol", required_argument, 0, 'K'},
   {"keep-symbols", required_argument, 0, OPTION_KEEP_SYMBOLS},
+  {"keep-section-symbols", required_argument, 0, OPTION_KEEP_SECTION_SYMBOLS},
   {"localize-hidden", no_argument, 0, OPTION_LOCALIZE_HIDDEN},
   {"localize-symbol", required_argument, 0, 'L'},
   {"localize-symbols", required_argument, 0, OPTION_LOCALIZE_SYMBOLS},
@@ -595,6 +599,7 @@ copy_usage (FILE *stream, int exit_status)
      --extract-symbol              Remove section contents but keep symbols\n\
      --keep-section <name>         Do not strip section <name>\n\
   -K --keep-symbol <name>          Do not strip symbol <name>\n\
+     --keep-section-symbols        Do not strip section symbols\n\
      --keep-file-symbols           Do not strip file symbol(s)\n\
      --localize-hidden             Turn all ELF hidden symbols into locals\n\
   -L --localize-symbol <name>      Force symbol <name> to be marked as a local\n\
@@ -729,6 +734,7 @@ strip_usage (FILE *stream, int exit_status)
   -N --strip-symbol=<name>         Do not copy symbol <name>\n\
      --keep-section=<name>         Do not strip section <name>\n\
   -K --keep-symbol=<name>          Do not strip symbol <name>\n\
+     --keep-section-symbols        Do not strip section symbols\n\
      --keep-file-symbols           Do not strip file symbol(s)\n\
   -w --wildcard                    Permit wildcard in symbol comparison\n\
   -x --discard-all                 Remove all non-global symbols\n\
@@ -3196,7 +3202,7 @@ copy_object (bfd *ibfd, bfd *obfd, const bfd_arch_info_type *input_arch)
    if ((obfd->flags & (EXEC_P | DYNAMIC)) != 0
        && (obfd->flags & HAS_RELOC) == 0)
     {
-      if (bfd_keep_unused_section_symbols (obfd))
+      if (bfd_keep_unused_section_symbols (obfd) || keep_section_symbols)
 	{
 	  /* Non-relocatable inputs may not have the unused section
 	     symbols.  Mark all section symbols as used to generate
@@ -4768,6 +4774,9 @@ strip_main (int argc, char *argv[])
 	case OPTION_KEEP_FILE_SYMBOLS:
 	  keep_file_symbols = 1;
 	  break;
+	case OPTION_KEEP_SECTION_SYMBOLS:
+	  keep_section_symbols = TRUE;
+	  break;
 	case 0:
 	  /* We've been given a long option.  */
 	  break;
@@ -5653,6 +5662,10 @@ copy_main (int argc, char *argv[])
 				&keep_specific_buffer);
 	  break;
 
+	case OPTION_KEEP_SECTION_SYMBOLS:
+	  keep_section_symbols = TRUE;
+	  break;
+
 	case OPTION_LOCALIZE_HIDDEN:
 	  localize_hidden = TRUE;
 	  break;