[Bug binutils/30835] New: [readelf] Incorrect warning with .gnu_debugaltlink (.debug_info offset in .debug_aranges section does not point to a CU header)

[vries at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=30835

            Bug ID: 30835
           Summary: [readelf] Incorrect warning with .gnu_debugaltlink
                    (.debug_info offset in .debug_aranges section does not
                    point to a CU header)
           Product: binutils
           Version: 2.42 (HEAD)
            Status: NEW
          Severity: normal
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: vries at gcc dot gnu.org
  Target Milestone: ---

I was using readelf to look at the executables in the gdb testcase
gdb.dwarf2/dwzbuildid.exp, and ran into a warning:
...
$ ~/binutils/install/bin/readelf -w
./leap-15-4/build/gdb/testsuite/outputs/gdb.dwarf2/dwzbuildid/dwzbuildid-ok >
READELF
readelf: Warning: .debug_info offset of 0x2e in .debug_aranges section does not
point to a CU header.
...

The .debug_aranges section where the warning originates is shown here:
...
Contents of the .debug_aranges section (loaded from
/data/vries/gdb/leap-15-4/build/gdb/testsuite/outputs/gdb.dwarf2/dwzbuildid/dwzbuildid3.o):

  Length:                   28
  Version:                  2
  Offset into .debug_info:  0
  Pointer Size:             8
  Segment Size:             0

    Address            Length
    0000000000000000 0000000000000000
  Length:                   28
  Version:                  2
  Offset into .debug_info:  0x2e
  Pointer Size:             8
  Segment Size:             0

    Address            Length
    0000000000000000 0000000000000000
...
and the corresponding .debug_info section is:
...
Contents of the .debug_info section (loaded from
/data/vries/gdb/leap-15-4/build/gdb/testsuite/outputs/gdb.dwarf2/dwzbuildid/dwzbuildid3.o):

  Compilation Unit @ offset 0:
   Length:        0x7 (32-bit)
   Version:       4
   Abbrev Offset: 0
   Pointer Size:  8
  Compilation Unit @ offset 0xb:
   Length:        0x1f (32-bit)
   Version:       4
   Abbrev Offset: 0x1
   Pointer Size:  8
 <0><16>: Abbrev Number: 2 (DW_TAG_compile_unit)
    <17>   DW_AT_language    : 2        (non-ANSI C)
 <1><18>: Abbrev Number: 3 (DW_TAG_base_type)
    <19>   DW_AT_name        : int
    <1d>   DW_AT_byte_size   : 4
    <1e>   DW_AT_encoding    : 5        (signed)
 <1><1f>: Abbrev Number: 4 (DW_TAG_constant)
    <20>   DW_AT_name        : the_int
    <28>   DW_AT_type        : <0x18>
    <2c>   DW_AT_const_value : 99
 <1><2d>: Abbrev Number: 0
  Compilation Unit @ offset 0x2e:
   Length:        0x7 (32-bit)
   Version:       4
   Abbrev Offset: 0x1f
   Pointer Size:  8
...

There seems to be a CU at 0x2e, so the warning looks incorrect.

When using readelf directly on the .gnu_debugaltlink file (dwzbuildid3.o), the
warning is not there.

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