[Bug binutils/31734] New: [binutils, readelf] dwarf4 .debug_str_offsets section printed incorrectly

[vries at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=31734

            Bug ID: 31734
           Summary: [binutils, readelf] dwarf4 .debug_str_offsets section
                    printed incorrectly
           Product: binutils
           Version: 2.43 (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 a hello world, compiled with split dwarf:
...
$ gcc-13 -gdwarf-4 -gsplit-dwarf -ggnu-pubnames -fdebug-types-section
-Wl,--gdb-index -fuse-ld=gold ~/data/hello.c -g3 -save-temps -dA
...

When dumping dwarf with readelf we get:
...
$ readelf -w a.out > READELF
readelf: Warning: string index of 707 converts to an offset of 0xb14 which is
too big for section .debug_str.dwo
readelf: Warning: string index of 708 converts to an offset of 0xb18 which is
too big for section .debug_str.dwo
...

If we look into the a-hello.s, the first three entries are:
...
        .section        .debug_str_offsets.dwo,"e",@progbits
        .long   0       # indexed string 0x0: __FLT16_NORM_MAX__
6.55040000000000000000000000000000000e+4F16
        .long   0x3f    # indexed string 0x1: _SIZE_T_
        .long   0x49    # indexed string 0x2: __SIG_ATOMIC_MAX__ 0x7fffffff
...
but readelf starts here, at the third entry:
...
Contents of the .debug_str_offsets.dwo section (loaded from
/home/vries/gdb/a-hello.dwo):

    Length: 0xb14
       Index   Offset [String]
           0 00000000  __SIG_ATOMIC_MAX__ 0x7fffffff
...

llvm-dwarfdump starts at the first entry, and doesn't warn or error out.

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