FYI: Unable to build -r501994 ports' devel/llvm60 on clang 8 based powerpc64 system: "BFD (GNU Binutils) 2.32 assertion fail elflink.c:2935"

[Mark Millard]

This was in a poudriere bulk build on a head -r347549 based powerpc64
system with system clang 8 for cc and c++ and base/binutils
for the likes of ld. (The system has the llvm libunwind patches
for powerpc64 so throwing c++ exceptions work.)

[4397/4552] : && /usr/bin/c++ -fPIC -O2 -pipe -DNDEBUG -fstack-protector-strong -isystem /usr/local/include -fno-strict-aliasing  -DNDEBUG -isystem /usr/local/include -fPIC -fvisibility-inlines-hidden -Werror=date-time -Werror=unguarded-availability-new -std=c++11 -Wall -W -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -pedantic -Wno-long-long -Wcovered-switch-default -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wstring-conversion -fcolor-diagnostics -ffunction-sections -fdata-sections -O2 -pipe -DNDEBUG -fstack-protector-strong -isystem /usr/local/include -fno-strict-aliasing  -DNDEBUG -isystem /usr/local/include  -fstack-protector-strong   -Wl,-z,origin  -Wl,-O3 -Wl,--gc-sections  -Wl,--version-script,/wrkdirs/usr/ports/devel/llvm60/work/.build/tools/lto/LTO.exports -shared -Wl,-soname,libLTO.so.6 -o lib/libLTO.so.6.0.1 tools/lto/CMakeFiles/LTO.dir/LTODisassembler.cpp.o tools/lto/CMakeFiles/LTO.dir/lto.cpp.o -L/usr/local/lib -Wl,-rpath,"\$ORIGIN/../lib:/usr/local/lib" lib/libLLVM-6.0.so && :
FAILED: lib/libLTO.so.6.0.1 
: && /usr/bin/c++ -fPIC -O2 -pipe -DNDEBUG -fstack-protector-strong -isystem /usr/local/include -fno-strict-aliasing  -DNDEBUG -isystem /usr/local/include -fPIC -fvisibility-inlines-hidden -Werror=date-time -Werror=unguarded-availability-new -std=c++11 -Wall -W -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -pedantic -Wno-long-long -Wcovered-switch-default -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wstring-conversion -fcolor-diagnostics -ffunction-sections -fdata-sections -O2 -pipe -DNDEBUG -fstack-protector-strong -isystem /usr/local/include -fno-strict-aliasing  -DNDEBUG -isystem /usr/local/include  -fstack-protector-strong   -Wl,-z,origin  -Wl,-O3 -Wl,--gc-sections  -Wl,--version-script,/wrkdirs/usr/ports/devel/llvm60/work/.build/tools/lto/LTO.exports -shared -Wl,-soname,libLTO.so.6 -o lib/libLTO.so.6.0.1 tools/lto/CMakeFiles/LTO.dir/LTODisassembler.cpp.o tools/lto/CMakeFiles/LTO.dir/lto.cpp.o -L/usr/local/lib -Wl,-rpath,"\$ORIGIN/../lib:/usr/local/lib" lib/libLLVM-6.0.so && :
/usr/bin/powerpc64-unknown-freebsd13.0-ld: BFD (GNU Binutils) 2.32 assertion fail elflink.c:2935
/usr/bin/powerpc64-unknown-freebsd13.0-ld: BFD (GNU Binutils) 2.32 assertion fail elflink.c:2935

The assert is the last BFD_ASSERT shown below:

/* Fix up the flags for a symbol.  This handles various cases which
   can only be fixed after all the input files are seen.  This is
   currently called by both adjust_dynamic_symbol and
   assign_sym_version, which is unnecessary but perhaps more robust in
   the face of future changes.  */

static bfd_boolean
_bfd_elf_fix_symbol_flags (struct elf_link_hash_entry *h,
                           struct elf_info_failed *eif)
{
. . .
  if (h->is_weakalias)
    {
      struct elf_link_hash_entry *def = weakdef (h);

      /* If the real definition is defined by a regular object file,
         don't do anything special.  See the longer description in
         _bfd_elf_adjust_dynamic_symbol, below.  */
      if (def->def_regular)
        {
          h = def;
          while ((h = h->u.alias) != def)
            h->is_weakalias = 0;
        }
      else
        {
          while (h->root.type == bfd_link_hash_indirect)
            h = (struct elf_link_hash_entry *) h->root.u.i.link;
          BFD_ASSERT (h->root.type == bfd_link_hash_defined
                      || h->root.type == bfd_link_hash_defweak);
          BFD_ASSERT (def->def_dynamic);
          BFD_ASSERT (def->root.type == bfd_link_hash_defined);
          (*bed->elf_backend_copy_indirect_symbol) (eif->info, def, h);
        }
    }

  return TRUE;
}


===
Mark Millard
marklmi at yahoo.com
( dsl-only.net went
away in early 2018-Mar)