[Bug binutils/27533] New: [readelf] -P required to print debug section in dwo file

[vries at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=27533

            Bug ID: 27533
           Summary: [readelf] -P required to print debug section in dwo
                    file
           Product: binutils
           Version: 2.37 (HEAD)
            Status: NEW
          Severity: normal
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: vries at gcc dot gnu.org
  Target Milestone: ---

Consider this test-case:
...
$ gcc ./src/gdb/testsuite/gdb.dwarf2/fission-multi-cu*.c -gsplit-dwarf
...

With system readelf (2.35.1), I get the .debug_info section of both .dwo files:
...
$ readelf -w a.out 2>&1 | grep "Contents of the .debug_info"
Contents of the .debug_info section (loaded from a.out):
Contents of the .debug_info.dwo section (loaded from
/home/vries/gdb_versions/devel/fission-multi-cu1.dwo):
Contents of the .debug_info.dwo section (loaded from
/home/vries/gdb_versions/devel/fission-multi-cu2.dwo):
...

But with trunk, we only get:
...
$ ~/binutils/install/bin/readelf -w a.out 2>&1 | grep "Contents of the
.debug_info"
Contents of the .debug_info section (loaded from a.out):
...

So, there are new options that dictate how links are followed and what is
displayed:
...
$ ~/binutils/install/bin/readelf -h
readelf: Warning: Nothing to do.
Usage: readelf <option(s)> elf-file(s)
 Display information about the contents of ELF format files
 Options are:
  -wk,--debug-dump=links
  Display the contents of sections that link to separate debuginfo files

  -P,--process-links
  Display the contents of non-debug sections in separate debuginfo files.
  (Implies -wK)

  -wK,--debug-dump=follow-links
  Follow links to separate debug info files
  (default)

  -wN,--debug-dump=no-follow-links
  Do not follow links to separate debug info files
...

>From the description, it seems to me that -wK should be the one that works. 
But that's the default already.  Specifying it explicitly doesn't work either:
...
$ ~/binutils/install/bin/readelf -w -wK a.out 2>&1 | grep "Contents of the
.debug_info"
Contents of the .debug_info section (loaded from a.out):
...

So, I don't understand what happens here, and I just try all switches at
random, until I find the one that works:
...
$ ~/binutils/install/bin/readelf -w -P a.out 2>&1 | grep "Contents of the
.debug_info"
Contents of the .debug_info section (loaded from a.out):
Contents of the .debug_info.dwo section (loaded from
/home/vries/gdb_versions/devel/fission-multi-cu1.dwo):
Contents of the .debug_info.dwo section (loaded from
/home/vries/gdb_versions/devel/fission-multi-cu2.dwo):
...

So, I need the switch that switches on printing of non-debug sections to print
the debug section .debug_info?

AFAIU, either there's something misleading in the description, or there's a bug
in the implementation.

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