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From: "vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug gdb/29227] [gdb, m32] FAIL: gdb.base/corefile.exp: core-file
 warning-free
Date: Mon, 06 Jun 2022 07:03:24 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29227

--- Comment #2 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Tom de Vries from comment #1)
> I wonder why is the core file is marked fbsd.

That seems to have to do with priorities:
...
(gdb) p abfd->xvec
$36 =3D (const struct bfd_target *) 0x2010b00 <i386_elf32_vec>
(gdb) p abfd->xvec->match_priority
$37 =3D 1 '\001'
...
and:
...
(gdb) p abfd->xvec
$41 =3D (const struct bfd_target *) 0x20112a0 <i386_elf32_fbsd_vec>
(gdb) p abfd->xvec->match_priority
$42 =3D 0 '\000'
...
and the matching in bfd/format.c where we find that lower priorities are
better:
...
              if (match_priority < best_match)
                {
                  best_match =3D match_priority;
                  best_count =3D 0;
                }
...

Still for the exec the fbsd arch fails to match, but for the core it does.

For the exec, we hit this in elfcode.h:elf_object_p():
...
  if (ebd->elf_machine_code !=3D EM_NONE
      && i_ehdrp->e_ident[EI_OSABI] !=3D ebd->elf_osabi
      && ebd->elf_osabi !=3D ELFOSABI_NONE)
    goto got_wrong_format_error;
...

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