[Bug binutils/23843] New: shouldn't "objdump -e dwarf=links" print multiple entries?

[m-srcware at bodyfour dot uk]

https://sourceware.org/bugzilla/show_bug.cgi?id=23843

            Bug ID: 23843
           Summary: shouldn't "objdump -e dwarf=links" print multiple
                    entries?
           Product: binutils
           Version: 2.32 (HEAD)
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: m-srcware at bodyfour dot uk
  Target Milestone: ---

When multiple objects that were compiled with "-gsplit-dwarf" are later linked
together the resulting ELF binary will have references to multiple *.dwo files,
which "objdump --dwarf=info" shows correctly.  However "objdump -dwarf=links"
only prints the last(?) one  and silently ignores the rest which seems
incorrect to me.

For an example, see the reproduction case attached to the (unrelated) Bug 23842
that I just filed.  After compiling it, you see:

$ ~/git/binutils-gdb/binutils/objdump --dwarf=info exe/exe | egrep
'DW_AT_GNU_dwo_name|DW_AT_comp_dir'
    <20>   DW_AT_GNU_dwo_name: (indirect string, offset: 0x0): exe.dwo
    <24>   DW_AT_comp_dir    : (indirect string, offset: 0x8):
/home/mitch/split-dwarf-multidir/exe
    <54>   DW_AT_GNU_dwo_name: (indirect string, offset: 0x53): a.dwo
    <58>   DW_AT_comp_dir    : (indirect string, offset: 0x2d):
/home/mitch/split-dwarf-multidir/liba
    <88>   DW_AT_GNU_dwo_name: (indirect string, offset: 0x7f): b.dwo
    <8c>   DW_AT_comp_dir    : (indirect string, offset: 0x59):
/home/mitch/split-dwarf-multidir/libb

$ ~/git/binutils-gdb/binutils/objdump --dwarf=links exe/exe

exe/exe:     file format elf64-x86-64

The .debug_info section contains a link to a dwo file:
  Name:      b.dwo
  Directory: /home/mitch/split-dwarf-multidir/libb
  ID:        b3 d9 32 5b a3 75 ed 4d


Forgive me if this is user error; I am new to -gsplit-dwarf.

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