Extend readelf and objdump so that they will display and follow multiple links to separate debug information files.

	PR 23843
	* dwarf.h (struct separate_info): New structure for containing
	information on separate debug info files.
	* dwarf.c (struct dwo_info): New structure for containing dwo
	links.
	(first_dwo_info): Chain of dwo_info structures.
	(first_separate_file): Chain of separate_info structures.
	(separate_debug_file, separate_debug_filename): Delete.
	(fetch_alt_indirect_string): Scan all separate debug info files
	for the requested string.
	(add_dwo_info): New function.
	(add_dwo_name): New function.
	(add_dwo_dir): New function.
	(add_dwo_id: New function.
	(free_dwo_info): New function.
	(read_and_display_attr_value): Store DWO data using the new
	functions.
	(load_debug_section_with_follow): If necessary, scan the list of
	separate debug info files for the requested section.
	(add_separate_debug_file): New function.
	(load_separate_debug_info): Call add_separate_debug_file to store
	the information on the newly loaded file.
	(load_dwo_file): Likewise.
	(load_separate_debif_file): Rename to load_separate_debug_files.
	Change return type to boolean.  If following links then attempt to
	load all separate debug info files, not just the first one.
	(free_debug_memory): Release memory in dwo_info and separate_info
	chains.
	* objdump.c (dump_dwarf): Iterate over all loaded debg info files.
	* readelf.c (process_object): Likewise.
	* doc/debug.options.texi: Update descriptions of links and
	follow-links options.
	* testsuite/binutils-all/objdump.WK2: Update expected output.
	* testsuite/binutils-all/readelf.k2: Likewise.
	* NEWS: Announce the new feature.

1 files changed, 11 insertions, 4 deletions

diff --git a/binutils/objdump.c b/binutils/objdump.c
index 7d0c6a4..19365b6 100644
--- a/binutils/objdump.c
+++ b/binutils/objdump.c
@@ -2882,7 +2882,7 @@ dump_dwarf_section (bfd *abfd, asection *section,
 static void
 dump_dwarf (bfd *abfd)
 {
-  bfd * separates;
+  bfd_boolean have_separates;
 
   is_relocatable = (abfd->flags & (EXEC_P | DYNAMIC)) == 0;
 
@@ -2946,12 +2946,19 @@ dump_dwarf (bfd *abfd)
       break;
     }
 
-  separates = load_separate_debug_file (abfd, bfd_get_filename (abfd));
+  have_separates = load_separate_debug_files (abfd, bfd_get_filename (abfd));
 
   bfd_map_over_sections (abfd, dump_dwarf_section, NULL);
 
-  if (separates)
-    bfd_map_over_sections (separates, dump_dwarf_section, NULL);
+  if (have_separates)
+    {
+      separate_info * i;
+
+      for (i = first_separate_info; i != NULL; i = i->next)
+	bfd_map_over_sections (i->handle, dump_dwarf_section, NULL);
+
+      /* The file handles are closed by the call to free_debug_memory() below.  */
+    }
 
   free_debug_memory ();
 }