[Bug ld/22300] Abort in elf32_hppa_relocate_section at elf32-hppa.c:4055 building debian polyml

[amodra at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=22300

Alan Modra <amodra at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|amodra at gmail dot com            |
           Assignee|unassigned at sourceware dot org   |amodra at gmail dot com

--- Comment #4 from Alan Modra <amodra at gmail dot com> ---
p *hh
$6 = {eh = {root = {root = {next = 0x288fa0, string = 0x14ede2
"PolyThreadForkThread", hash = 155903331}, 
      type = bfd_link_hash_defined, non_ir_ref_regular = 0, non_ir_ref_dynamic
= 0, linker_def = 0, ldscript_def = 0, u = {
        undef = {next = 0x12fb18, abfd = 0x1581f8}, def = {next = 0x12fb18,
section = 0x1581f8, value = 225876}, i = {
          next = 0x12fb18, link = 0x1581f8, 
          warning = 0x37254 <gldhppalinux_search_needed+532>
"\b\003\002Z\350X\n\255\b\006\002C\350X\n\235\b\021\002Z4\031"}, c = {
          next = 0x12fb18, p = 0x1581f8, size = 225876}}}, indx = -1, dynindx =
39, got = {refcount = -1, offset = 4294967295, 
      glist = 0xffffffff, plist = 0xffffffff}, plt = {refcount = -1, offset =
4294967295, glist = 0xffffffff, plist = 0xffffffff}, 
    size = 604, type = 2, other = 0, target_internal = 0, ref_regular = 1,
def_regular = 0, ref_dynamic = 0, def_dynamic = 1, 
    ref_regular_nonweak = 1, dynamic_adjusted = 1, needs_copy = 0, needs_plt =
0, non_elf = 1, versioned = unversioned, 
    forced_local = 0, dynamic = 0, mark = 0, non_got_ref = 0, dynamic_def = 1,
ref_dynamic_nonweak = 0, 
    pointer_equality_needed = 0, unique_global = 0, protected_def = 0,
start_stop = 0, dynstr_index = 1527, u = {
      weakdef = 0xde9f7f4, elf_hash_value = 233437172}, verinfo = {verdef =
0x0, vertree = 0x0}, u2 = {start_stop_section = 0x0, 
      vtable = 0x0}}, hsh_cache = 0x0, dyn_relocs = 0x0, tls_type =
GOT_UNKNOWN, plabel = 0}

Huh, non_elf set?  So that comes about due to _bfd_elf_merge_symbol not getting
to elflink.c:1212 where non_elf is cleared.  And if we don't get there then
none of the proper merging of elf symbols occurs.

And that's because _bfd_elf_merge_symbol exits here:
  if (!(*bed->relocs_compatible) (abfd->xvec, info->output_bfd->xvec))
    return TRUE;

The output bfd vec is hppa_elf32_linux_vec while the input (polyexport.o) is
hppa_elf32_vec, and elf32-hppa.c has no define for
elf_backend_relocs_compatible so uses the default that requires an exact match
of bfd vec.

polyexport.o is hppa_elf32_vec because os/abi is ELFOSABI_HPUX.  The output is
hppa_elf32_linux_vec because that's the default target.


bug 1: polyimport, the producer of polyexport.o is using the wrong os/abi for
hppa-linux.

bug 2: elf32-hppa.c ought to be using _bfd_elf_relocs_compatible

bug 3: _bfd_elf_merge_symbol shouldn't be using relocs_compatible

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