readelf: Add option to display the names of sections referenced by symbols.

  PR 30684
  * readelf.c (extra_sym_info): New variable. (section_name_valid): Also check for filedata being NULL. (section_name_print): Delete. (section_index_real): New function.  Returns true if the given section index references a real section. (print_symbol): Rename to print_sumbol_name. (printable_section_name): Use a rotating array of static buffers for the return string. (printable_section_name_from_index): Merge code from dump_relocations and get_symbol_index_type into here. (long_option_values): Add OPTION_NO_EXTRA_SYM_INFO. (options): Add "extra-sym-info" and "no-extra-sym-info". (usage): Mention new options. (parse_args): Parse new options. (get_symbol_index_type): Delete. (print_dynamic_symbol_size): Rename to print_symbol_size. (print_dynamic_symbol): Rename to print_symbol. (print_symbol_table_heading): New function. (process_symbol_table): Use new function.
  * doc/binutils.texi: Document the new option.
  * NEWS: Mention the new feature.

1 files changed, 15 insertions, 0 deletions

diff --git a/binutils/doc/binutils.texi b/binutils/doc/binutils.texi
index 9f80f39..56394b2 100644
--- a/binutils/doc/binutils.texi
+++ b/binutils/doc/binutils.texi
@@ -4961,6 +4961,7 @@ readelf [@option{-a}|@option{--all}]
         [@option{--quiet}]
         [@option{--recurse-limit}|@option{--no-recurse-limit}]
         [@option{-U} @var{method}|@option{--unicode=}@var{method}]
+        [@option{-X}|@option{--extra-sym-info}|@option{--no-extra-sym-info}]
         [@option{-n}|@option{--notes}]
         [@option{-r}|@option{--relocs}]
         [@option{-u}|@option{--unwind}]
@@ -5152,6 +5153,20 @@ assuming that colouring is supported by the output device.  The
 colouring is intended to draw attention to the presence of unicode
 sequences when they might not be expected.
 
+@item -X
+@itemx --extra-sym-info
+When displaying details of symbols, include extra information not
+normally presented.  Currently this just adds the name of the section
+referenced by the symbol's index field, if there is one.  In the
+future more information may be displayed when this option is enabled.
+
+Enabling this option effectively enables the @option{--wide} option as
+well, at least when displaying symbol information.
+
+@item --no-extra-sym-info
+Disables the effect of the @option{--extra-sym-info} option.  This
+is the default.
+
 @item -e
 @itemx --headers
 Display all the headers in the file.  Equivalent to @option{-h -l -S}.