File: elflink.c

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binutils 2.31.1-16
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  • sloc: ansic: 1,161,194; asm: 638,508; cpp: 128,829; exp: 68,580; makefile: 55,828; sh: 22,360; yacc: 14,238; lisp: 13,272; perl: 2,111; ada: 1,681; lex: 1,652; pascal: 1,446; cs: 879; sed: 195; python: 154; xml: 95; awk: 25
file content (14524 lines) | stat: -rw-r--r-- 427,107 bytes parent folder | download | duplicates (5)
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/* ELF linking support for BFD.
   Copyright (C) 1995-2018 Free Software Foundation, Inc.

   This file is part of BFD, the Binary File Descriptor library.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
   MA 02110-1301, USA.  */

#include "sysdep.h"
#include "bfd.h"
#include "bfd_stdint.h"
#include "bfdlink.h"
#include "libbfd.h"
#define ARCH_SIZE 0
#include "elf-bfd.h"
#include "safe-ctype.h"
#include "libiberty.h"
#include "objalloc.h"
#if BFD_SUPPORTS_PLUGINS
#include "plugin-api.h"
#include "plugin.h"
#endif

/* This struct is used to pass information to routines called via
   elf_link_hash_traverse which must return failure.  */

struct elf_info_failed
{
  struct bfd_link_info *info;
  bfd_boolean failed;
};

/* This structure is used to pass information to
   _bfd_elf_link_find_version_dependencies.  */

struct elf_find_verdep_info
{
  /* General link information.  */
  struct bfd_link_info *info;
  /* The number of dependencies.  */
  unsigned int vers;
  /* Whether we had a failure.  */
  bfd_boolean failed;
};

static bfd_boolean _bfd_elf_fix_symbol_flags
  (struct elf_link_hash_entry *, struct elf_info_failed *);

asection *
_bfd_elf_section_for_symbol (struct elf_reloc_cookie *cookie,
			     unsigned long r_symndx,
			     bfd_boolean discard)
{
  if (r_symndx >= cookie->locsymcount
      || ELF_ST_BIND (cookie->locsyms[r_symndx].st_info) != STB_LOCAL)
    {
      struct elf_link_hash_entry *h;

      h = cookie->sym_hashes[r_symndx - cookie->extsymoff];

      while (h->root.type == bfd_link_hash_indirect
	     || h->root.type == bfd_link_hash_warning)
	h = (struct elf_link_hash_entry *) h->root.u.i.link;

      if ((h->root.type == bfd_link_hash_defined
	   || h->root.type == bfd_link_hash_defweak)
	   && discarded_section (h->root.u.def.section))
	return h->root.u.def.section;
      else
	return NULL;
    }
  else
    {
      /* It's not a relocation against a global symbol,
	 but it could be a relocation against a local
	 symbol for a discarded section.  */
      asection *isec;
      Elf_Internal_Sym *isym;

      /* Need to: get the symbol; get the section.  */
      isym = &cookie->locsyms[r_symndx];
      isec = bfd_section_from_elf_index (cookie->abfd, isym->st_shndx);
      if (isec != NULL
	  && discard ? discarded_section (isec) : 1)
	return isec;
     }
  return NULL;
}

/* Define a symbol in a dynamic linkage section.  */

struct elf_link_hash_entry *
_bfd_elf_define_linkage_sym (bfd *abfd,
			     struct bfd_link_info *info,
			     asection *sec,
			     const char *name)
{
  struct elf_link_hash_entry *h;
  struct bfd_link_hash_entry *bh;
  const struct elf_backend_data *bed;

  h = elf_link_hash_lookup (elf_hash_table (info), name, FALSE, FALSE, FALSE);
  if (h != NULL)
    {
      /* Zap symbol defined in an as-needed lib that wasn't linked.
	 This is a symptom of a larger problem:  Absolute symbols
	 defined in shared libraries can't be overridden, because we
	 lose the link to the bfd which is via the symbol section.  */
      h->root.type = bfd_link_hash_new;
      bh = &h->root;
    }
  else
    bh = NULL;

  bed = get_elf_backend_data (abfd);
  if (!_bfd_generic_link_add_one_symbol (info, abfd, name, BSF_GLOBAL,
					 sec, 0, NULL, FALSE, bed->collect,
					 &bh))
    return NULL;
  h = (struct elf_link_hash_entry *) bh;
  BFD_ASSERT (h != NULL);
  h->def_regular = 1;
  h->non_elf = 0;
  h->root.linker_def = 1;
  h->type = STT_OBJECT;
  if (ELF_ST_VISIBILITY (h->other) != STV_INTERNAL)
    h->other = (h->other & ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN;

  (*bed->elf_backend_hide_symbol) (info, h, TRUE);
  return h;
}

bfd_boolean
_bfd_elf_create_got_section (bfd *abfd, struct bfd_link_info *info)
{
  flagword flags;
  asection *s;
  struct elf_link_hash_entry *h;
  const struct elf_backend_data *bed = get_elf_backend_data (abfd);
  struct elf_link_hash_table *htab = elf_hash_table (info);

  /* This function may be called more than once.  */
  if (htab->sgot != NULL)
    return TRUE;

  flags = bed->dynamic_sec_flags;

  s = bfd_make_section_anyway_with_flags (abfd,
					  (bed->rela_plts_and_copies_p
					   ? ".rela.got" : ".rel.got"),
					  (bed->dynamic_sec_flags
					   | SEC_READONLY));
  if (s == NULL
      || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
    return FALSE;
  htab->srelgot = s;

  s = bfd_make_section_anyway_with_flags (abfd, ".got", flags);
  if (s == NULL
      || !bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
    return FALSE;
  htab->sgot = s;

  if (bed->want_got_plt)
    {
      s = bfd_make_section_anyway_with_flags (abfd, ".got.plt", flags);
      if (s == NULL
	  || !bfd_set_section_alignment (abfd, s,
					 bed->s->log_file_align))
	return FALSE;
      htab->sgotplt = s;
    }

  /* The first bit of the global offset table is the header.  */
  s->size += bed->got_header_size;

  if (bed->want_got_sym)
    {
      /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got
	 (or .got.plt) section.  We don't do this in the linker script
	 because we don't want to define the symbol if we are not creating
	 a global offset table.  */
      h = _bfd_elf_define_linkage_sym (abfd, info, s,
				       "_GLOBAL_OFFSET_TABLE_");
      elf_hash_table (info)->hgot = h;
      if (h == NULL)
	return FALSE;
    }

  return TRUE;
}

/* Create a strtab to hold the dynamic symbol names.  */
static bfd_boolean
_bfd_elf_link_create_dynstrtab (bfd *abfd, struct bfd_link_info *info)
{
  struct elf_link_hash_table *hash_table;

  hash_table = elf_hash_table (info);
  if (hash_table->dynobj == NULL)
    {
      /* We may not set dynobj, an input file holding linker created
	 dynamic sections to abfd, which may be a dynamic object with
	 its own dynamic sections.  We need to find a normal input file
	 to hold linker created sections if possible.  */
      if ((abfd->flags & (DYNAMIC | BFD_PLUGIN)) != 0)
	{
	  bfd *ibfd;
	  asection *s;
	  for (ibfd = info->input_bfds; ibfd; ibfd = ibfd->link.next)
	    if ((ibfd->flags
		 & (DYNAMIC | BFD_LINKER_CREATED | BFD_PLUGIN)) == 0
		&& bfd_get_flavour (ibfd) == bfd_target_elf_flavour
		&& !((s = ibfd->sections) != NULL
		     && s->sec_info_type == SEC_INFO_TYPE_JUST_SYMS))
	      {
		abfd = ibfd;
		break;
	      }
	}
      hash_table->dynobj = abfd;
    }

  if (hash_table->dynstr == NULL)
    {
      hash_table->dynstr = _bfd_elf_strtab_init ();
      if (hash_table->dynstr == NULL)
	return FALSE;
    }
  return TRUE;
}

/* Create some sections which will be filled in with dynamic linking
   information.  ABFD is an input file which requires dynamic sections
   to be created.  The dynamic sections take up virtual memory space
   when the final executable is run, so we need to create them before
   addresses are assigned to the output sections.  We work out the
   actual contents and size of these sections later.  */

bfd_boolean
_bfd_elf_link_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info)
{
  flagword flags;
  asection *s;
  const struct elf_backend_data *bed;
  struct elf_link_hash_entry *h;

  if (! is_elf_hash_table (info->hash))
    return FALSE;

  if (elf_hash_table (info)->dynamic_sections_created)
    return TRUE;

  if (!_bfd_elf_link_create_dynstrtab (abfd, info))
    return FALSE;

  abfd = elf_hash_table (info)->dynobj;
  bed = get_elf_backend_data (abfd);

  flags = bed->dynamic_sec_flags;

  /* A dynamically linked executable has a .interp section, but a
     shared library does not.  */
  if (bfd_link_executable (info) && !info->nointerp)
    {
      s = bfd_make_section_anyway_with_flags (abfd, ".interp",
					      flags | SEC_READONLY);
      if (s == NULL)
	return FALSE;
    }

  /* Create sections to hold version informations.  These are removed
     if they are not needed.  */
  s = bfd_make_section_anyway_with_flags (abfd, ".gnu.version_d",
					  flags | SEC_READONLY);
  if (s == NULL
      || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
    return FALSE;

  s = bfd_make_section_anyway_with_flags (abfd, ".gnu.version",
					  flags | SEC_READONLY);
  if (s == NULL
      || ! bfd_set_section_alignment (abfd, s, 1))
    return FALSE;

  s = bfd_make_section_anyway_with_flags (abfd, ".gnu.version_r",
					  flags | SEC_READONLY);
  if (s == NULL
      || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
    return FALSE;

  s = bfd_make_section_anyway_with_flags (abfd, ".dynsym",
					  flags | SEC_READONLY);
  if (s == NULL
      || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
    return FALSE;
  elf_hash_table (info)->dynsym = s;

  s = bfd_make_section_anyway_with_flags (abfd, ".dynstr",
					  flags | SEC_READONLY);
  if (s == NULL)
    return FALSE;

  s = bfd_make_section_anyway_with_flags (abfd, ".dynamic", flags);
  if (s == NULL
      || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
    return FALSE;

  /* The special symbol _DYNAMIC is always set to the start of the
     .dynamic section.  We could set _DYNAMIC in a linker script, but we
     only want to define it if we are, in fact, creating a .dynamic
     section.  We don't want to define it if there is no .dynamic
     section, since on some ELF platforms the start up code examines it
     to decide how to initialize the process.  */
  h = _bfd_elf_define_linkage_sym (abfd, info, s, "_DYNAMIC");
  elf_hash_table (info)->hdynamic = h;
  if (h == NULL)
    return FALSE;

  if (info->emit_hash)
    {
      s = bfd_make_section_anyway_with_flags (abfd, ".hash",
					      flags | SEC_READONLY);
      if (s == NULL
	  || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
	return FALSE;
      elf_section_data (s)->this_hdr.sh_entsize = bed->s->sizeof_hash_entry;
    }

  if (info->emit_gnu_hash)
    {
      s = bfd_make_section_anyway_with_flags (abfd, ".gnu.hash",
					      flags | SEC_READONLY);
      if (s == NULL
	  || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
	return FALSE;
      /* For 64-bit ELF, .gnu.hash is a non-uniform entity size section:
	 4 32-bit words followed by variable count of 64-bit words, then
	 variable count of 32-bit words.  */
      if (bed->s->arch_size == 64)
	elf_section_data (s)->this_hdr.sh_entsize = 0;
      else
	elf_section_data (s)->this_hdr.sh_entsize = 4;
    }

  /* Let the backend create the rest of the sections.  This lets the
     backend set the right flags.  The backend will normally create
     the .got and .plt sections.  */
  if (bed->elf_backend_create_dynamic_sections == NULL
      || ! (*bed->elf_backend_create_dynamic_sections) (abfd, info))
    return FALSE;

  elf_hash_table (info)->dynamic_sections_created = TRUE;

  return TRUE;
}

/* Create dynamic sections when linking against a dynamic object.  */

bfd_boolean
_bfd_elf_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info)
{
  flagword flags, pltflags;
  struct elf_link_hash_entry *h;
  asection *s;
  const struct elf_backend_data *bed = get_elf_backend_data (abfd);
  struct elf_link_hash_table *htab = elf_hash_table (info);

  /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and
     .rel[a].bss sections.  */
  flags = bed->dynamic_sec_flags;

  pltflags = flags;
  if (bed->plt_not_loaded)
    /* We do not clear SEC_ALLOC here because we still want the OS to
       allocate space for the section; it's just that there's nothing
       to read in from the object file.  */
    pltflags &= ~ (SEC_CODE | SEC_LOAD | SEC_HAS_CONTENTS);
  else
    pltflags |= SEC_ALLOC | SEC_CODE | SEC_LOAD;
  if (bed->plt_readonly)
    pltflags |= SEC_READONLY;

  s = bfd_make_section_anyway_with_flags (abfd, ".plt", pltflags);
  if (s == NULL
      || ! bfd_set_section_alignment (abfd, s, bed->plt_alignment))
    return FALSE;
  htab->splt = s;

  /* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the
     .plt section.  */
  if (bed->want_plt_sym)
    {
      h = _bfd_elf_define_linkage_sym (abfd, info, s,
				       "_PROCEDURE_LINKAGE_TABLE_");
      elf_hash_table (info)->hplt = h;
      if (h == NULL)
	return FALSE;
    }

  s = bfd_make_section_anyway_with_flags (abfd,
					  (bed->rela_plts_and_copies_p
					   ? ".rela.plt" : ".rel.plt"),
					  flags | SEC_READONLY);
  if (s == NULL
      || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
    return FALSE;
  htab->srelplt = s;

  if (! _bfd_elf_create_got_section (abfd, info))
    return FALSE;

  if (bed->want_dynbss)
    {
      /* The .dynbss section is a place to put symbols which are defined
	 by dynamic objects, are referenced by regular objects, and are
	 not functions.  We must allocate space for them in the process
	 image and use a R_*_COPY reloc to tell the dynamic linker to
	 initialize them at run time.  The linker script puts the .dynbss
	 section into the .bss section of the final image.  */
      s = bfd_make_section_anyway_with_flags (abfd, ".dynbss",
					      SEC_ALLOC | SEC_LINKER_CREATED);
      if (s == NULL)
	return FALSE;
      htab->sdynbss = s;

      if (bed->want_dynrelro)
	{
	  /* Similarly, but for symbols that were originally in read-only
	     sections.  This section doesn't really need to have contents,
	     but make it like other .data.rel.ro sections.  */
	  s = bfd_make_section_anyway_with_flags (abfd, ".data.rel.ro",
						  flags);
	  if (s == NULL)
	    return FALSE;
	  htab->sdynrelro = s;
	}

      /* The .rel[a].bss section holds copy relocs.  This section is not
	 normally needed.  We need to create it here, though, so that the
	 linker will map it to an output section.  We can't just create it
	 only if we need it, because we will not know whether we need it
	 until we have seen all the input files, and the first time the
	 main linker code calls BFD after examining all the input files
	 (size_dynamic_sections) the input sections have already been
	 mapped to the output sections.  If the section turns out not to
	 be needed, we can discard it later.  We will never need this
	 section when generating a shared object, since they do not use
	 copy relocs.  */
      if (bfd_link_executable (info))
	{
	  s = bfd_make_section_anyway_with_flags (abfd,
						  (bed->rela_plts_and_copies_p
						   ? ".rela.bss" : ".rel.bss"),
						  flags | SEC_READONLY);
	  if (s == NULL
	      || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
	    return FALSE;
	  htab->srelbss = s;

	  if (bed->want_dynrelro)
	    {
	      s = (bfd_make_section_anyway_with_flags
		   (abfd, (bed->rela_plts_and_copies_p
			   ? ".rela.data.rel.ro" : ".rel.data.rel.ro"),
		    flags | SEC_READONLY));
	      if (s == NULL
		  || ! bfd_set_section_alignment (abfd, s,
						  bed->s->log_file_align))
		return FALSE;
	      htab->sreldynrelro = s;
	    }
	}
    }

  return TRUE;
}

/* Record a new dynamic symbol.  We record the dynamic symbols as we
   read the input files, since we need to have a list of all of them
   before we can determine the final sizes of the output sections.
   Note that we may actually call this function even though we are not
   going to output any dynamic symbols; in some cases we know that a
   symbol should be in the dynamic symbol table, but only if there is
   one.  */

bfd_boolean
bfd_elf_link_record_dynamic_symbol (struct bfd_link_info *info,
				    struct elf_link_hash_entry *h)
{
  if (h->dynindx == -1)
    {
      struct elf_strtab_hash *dynstr;
      char *p;
      const char *name;
      size_t indx;

      /* XXX: The ABI draft says the linker must turn hidden and
	 internal symbols into STB_LOCAL symbols when producing the
	 DSO. However, if ld.so honors st_other in the dynamic table,
	 this would not be necessary.  */
      switch (ELF_ST_VISIBILITY (h->other))
	{
	case STV_INTERNAL:
	case STV_HIDDEN:
	  if (h->root.type != bfd_link_hash_undefined
	      && h->root.type != bfd_link_hash_undefweak)
	    {
	      h->forced_local = 1;
	      if (!elf_hash_table (info)->is_relocatable_executable)
		return TRUE;
	    }

	default:
	  break;
	}

      h->dynindx = elf_hash_table (info)->dynsymcount;
      ++elf_hash_table (info)->dynsymcount;

      dynstr = elf_hash_table (info)->dynstr;
      if (dynstr == NULL)
	{
	  /* Create a strtab to hold the dynamic symbol names.  */
	  elf_hash_table (info)->dynstr = dynstr = _bfd_elf_strtab_init ();
	  if (dynstr == NULL)
	    return FALSE;
	}

      /* We don't put any version information in the dynamic string
	 table.  */
      name = h->root.root.string;
      p = strchr (name, ELF_VER_CHR);
      if (p != NULL)
	/* We know that the p points into writable memory.  In fact,
	   there are only a few symbols that have read-only names, being
	   those like _GLOBAL_OFFSET_TABLE_ that are created specially
	   by the backends.  Most symbols will have names pointing into
	   an ELF string table read from a file, or to objalloc memory.  */
	*p = 0;

      indx = _bfd_elf_strtab_add (dynstr, name, p != NULL);

      if (p != NULL)
	*p = ELF_VER_CHR;

      if (indx == (size_t) -1)
	return FALSE;
      h->dynstr_index = indx;
    }

  return TRUE;
}

/* Mark a symbol dynamic.  */

static void
bfd_elf_link_mark_dynamic_symbol (struct bfd_link_info *info,
				  struct elf_link_hash_entry *h,
				  Elf_Internal_Sym *sym)
{
  struct bfd_elf_dynamic_list *d = info->dynamic_list;

  /* It may be called more than once on the same H.  */
  if(h->dynamic || bfd_link_relocatable (info))
    return;

  if ((info->dynamic_data
       && (h->type == STT_OBJECT
	   || h->type == STT_COMMON
	   || (sym != NULL
	       && (ELF_ST_TYPE (sym->st_info) == STT_OBJECT
		   || ELF_ST_TYPE (sym->st_info) == STT_COMMON))))
      || (d != NULL
	  && h->non_elf
	  && (*d->match) (&d->head, NULL, h->root.root.string)))
    {
      h->dynamic = 1;
      /* NB: If a symbol is made dynamic by --dynamic-list, it has
	 non-IR reference.  */
      h->root.non_ir_ref_dynamic = 1;
    }
}

/* Record an assignment to a symbol made by a linker script.  We need
   this in case some dynamic object refers to this symbol.  */

bfd_boolean
bfd_elf_record_link_assignment (bfd *output_bfd,
				struct bfd_link_info *info,
				const char *name,
				bfd_boolean provide,
				bfd_boolean hidden)
{
  struct elf_link_hash_entry *h, *hv;
  struct elf_link_hash_table *htab;
  const struct elf_backend_data *bed;

  if (!is_elf_hash_table (info->hash))
    return TRUE;

  htab = elf_hash_table (info);
  h = elf_link_hash_lookup (htab, name, !provide, TRUE, FALSE);
  if (h == NULL)
    return provide;

  if (h->root.type == bfd_link_hash_warning)
    h = (struct elf_link_hash_entry *) h->root.u.i.link;

  if (h->versioned == unknown)
    {
      /* Set versioned if symbol version is unknown.  */
      char *version = strrchr (name, ELF_VER_CHR);
      if (version)
	{
	  if (version > name && version[-1] != ELF_VER_CHR)
	    h->versioned = versioned_hidden;
	  else
	    h->versioned = versioned;
	}
    }

  /* Symbols defined in a linker script but not referenced anywhere
     else will have non_elf set.  */
  if (h->non_elf)
    {
      bfd_elf_link_mark_dynamic_symbol (info, h, NULL);
      h->non_elf = 0;
    }

  switch (h->root.type)
    {
    case bfd_link_hash_defined:
    case bfd_link_hash_defweak:
    case bfd_link_hash_common:
      break;
    case bfd_link_hash_undefweak:
    case bfd_link_hash_undefined:
      /* Since we're defining the symbol, don't let it seem to have not
	 been defined.  record_dynamic_symbol and size_dynamic_sections
	 may depend on this.  */
      h->root.type = bfd_link_hash_new;
      if (h->root.u.undef.next != NULL || htab->root.undefs_tail == &h->root)
	bfd_link_repair_undef_list (&htab->root);
      break;
    case bfd_link_hash_new:
      break;
    case bfd_link_hash_indirect:
      /* We had a versioned symbol in a dynamic library.  We make the
	 the versioned symbol point to this one.  */
      bed = get_elf_backend_data (output_bfd);
      hv = h;
      while (hv->root.type == bfd_link_hash_indirect
	     || hv->root.type == bfd_link_hash_warning)
	hv = (struct elf_link_hash_entry *) hv->root.u.i.link;
      /* We don't need to update h->root.u since linker will set them
	 later.  */
      h->root.type = bfd_link_hash_undefined;
      hv->root.type = bfd_link_hash_indirect;
      hv->root.u.i.link = (struct bfd_link_hash_entry *) h;
      (*bed->elf_backend_copy_indirect_symbol) (info, h, hv);
      break;
    default:
      BFD_FAIL ();
      return FALSE;
    }

  /* If this symbol is being provided by the linker script, and it is
     currently defined by a dynamic object, but not by a regular
     object, then mark it as undefined so that the generic linker will
     force the correct value.  */
  if (provide
      && h->def_dynamic
      && !h->def_regular)
    h->root.type = bfd_link_hash_undefined;

  /* If this symbol is currently defined by a dynamic object, but not
     by a regular object, then clear out any version information because
     the symbol will not be associated with the dynamic object any
     more.  */
  if (h->def_dynamic && !h->def_regular)
    h->verinfo.verdef = NULL;

  /* Make sure this symbol is not garbage collected.  */
  h->mark = 1;

  h->def_regular = 1;

  if (hidden)
    {
      bed = get_elf_backend_data (output_bfd);
      if (ELF_ST_VISIBILITY (h->other) != STV_INTERNAL)
	h->other = (h->other & ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN;
      (*bed->elf_backend_hide_symbol) (info, h, TRUE);
    }

  /* STV_HIDDEN and STV_INTERNAL symbols must be STB_LOCAL in shared objects
     and executables.  */
  if (!bfd_link_relocatable (info)
      && h->dynindx != -1
      && (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN
	  || ELF_ST_VISIBILITY (h->other) == STV_INTERNAL))
    h->forced_local = 1;

  if ((h->def_dynamic
       || h->ref_dynamic
       || bfd_link_dll (info)
       || elf_hash_table (info)->is_relocatable_executable)
      && !h->forced_local
      && h->dynindx == -1)
    {
      if (! bfd_elf_link_record_dynamic_symbol (info, h))
	return FALSE;

      /* If this is a weak defined symbol, and we know a corresponding
	 real symbol from the same dynamic object, make sure the real
	 symbol is also made into a dynamic symbol.  */
      if (h->is_weakalias)
	{
	  struct elf_link_hash_entry *def = weakdef (h);

	  if (def->dynindx == -1
	      && !bfd_elf_link_record_dynamic_symbol (info, def))
	    return FALSE;
	}
    }

  return TRUE;
}

/* Record a new local dynamic symbol.  Returns 0 on failure, 1 on
   success, and 2 on a failure caused by attempting to record a symbol
   in a discarded section, eg. a discarded link-once section symbol.  */

int
bfd_elf_link_record_local_dynamic_symbol (struct bfd_link_info *info,
					  bfd *input_bfd,
					  long input_indx)
{
  bfd_size_type amt;
  struct elf_link_local_dynamic_entry *entry;
  struct elf_link_hash_table *eht;
  struct elf_strtab_hash *dynstr;
  size_t dynstr_index;
  char *name;
  Elf_External_Sym_Shndx eshndx;
  char esym[sizeof (Elf64_External_Sym)];

  if (! is_elf_hash_table (info->hash))
    return 0;

  /* See if the entry exists already.  */
  for (entry = elf_hash_table (info)->dynlocal; entry ; entry = entry->next)
    if (entry->input_bfd == input_bfd && entry->input_indx == input_indx)
      return 1;

  amt = sizeof (*entry);
  entry = (struct elf_link_local_dynamic_entry *) bfd_alloc (input_bfd, amt);
  if (entry == NULL)
    return 0;

  /* Go find the symbol, so that we can find it's name.  */
  if (!bfd_elf_get_elf_syms (input_bfd, &elf_tdata (input_bfd)->symtab_hdr,
			     1, input_indx, &entry->isym, esym, &eshndx))
    {
      bfd_release (input_bfd, entry);
      return 0;
    }

  if (entry->isym.st_shndx != SHN_UNDEF
      && entry->isym.st_shndx < SHN_LORESERVE)
    {
      asection *s;

      s = bfd_section_from_elf_index (input_bfd, entry->isym.st_shndx);
      if (s == NULL || bfd_is_abs_section (s->output_section))
	{
	  /* We can still bfd_release here as nothing has done another
	     bfd_alloc.  We can't do this later in this function.  */
	  bfd_release (input_bfd, entry);
	  return 2;
	}
    }

  name = (bfd_elf_string_from_elf_section
	  (input_bfd, elf_tdata (input_bfd)->symtab_hdr.sh_link,
	   entry->isym.st_name));

  dynstr = elf_hash_table (info)->dynstr;
  if (dynstr == NULL)
    {
      /* Create a strtab to hold the dynamic symbol names.  */
      elf_hash_table (info)->dynstr = dynstr = _bfd_elf_strtab_init ();
      if (dynstr == NULL)
	return 0;
    }

  dynstr_index = _bfd_elf_strtab_add (dynstr, name, FALSE);
  if (dynstr_index == (size_t) -1)
    return 0;
  entry->isym.st_name = dynstr_index;

  eht = elf_hash_table (info);

  entry->next = eht->dynlocal;
  eht->dynlocal = entry;
  entry->input_bfd = input_bfd;
  entry->input_indx = input_indx;
  eht->dynsymcount++;

  /* Whatever binding the symbol had before, it's now local.  */
  entry->isym.st_info
    = ELF_ST_INFO (STB_LOCAL, ELF_ST_TYPE (entry->isym.st_info));

  /* The dynindx will be set at the end of size_dynamic_sections.  */

  return 1;
}

/* Return the dynindex of a local dynamic symbol.  */

long
_bfd_elf_link_lookup_local_dynindx (struct bfd_link_info *info,
				    bfd *input_bfd,
				    long input_indx)
{
  struct elf_link_local_dynamic_entry *e;

  for (e = elf_hash_table (info)->dynlocal; e ; e = e->next)
    if (e->input_bfd == input_bfd && e->input_indx == input_indx)
      return e->dynindx;
  return -1;
}

/* This function is used to renumber the dynamic symbols, if some of
   them are removed because they are marked as local.  This is called
   via elf_link_hash_traverse.  */

static bfd_boolean
elf_link_renumber_hash_table_dynsyms (struct elf_link_hash_entry *h,
				      void *data)
{
  size_t *count = (size_t *) data;

  if (h->forced_local)
    return TRUE;

  if (h->dynindx != -1)
    h->dynindx = ++(*count);

  return TRUE;
}


/* Like elf_link_renumber_hash_table_dynsyms, but just number symbols with
   STB_LOCAL binding.  */

static bfd_boolean
elf_link_renumber_local_hash_table_dynsyms (struct elf_link_hash_entry *h,
					    void *data)
{
  size_t *count = (size_t *) data;

  if (!h->forced_local)
    return TRUE;

  if (h->dynindx != -1)
    h->dynindx = ++(*count);

  return TRUE;
}

/* Return true if the dynamic symbol for a given section should be
   omitted when creating a shared library.  */
bfd_boolean
_bfd_elf_omit_section_dynsym_default (bfd *output_bfd ATTRIBUTE_UNUSED,
				      struct bfd_link_info *info,
				      asection *p)
{
  struct elf_link_hash_table *htab;
  asection *ip;

  switch (elf_section_data (p)->this_hdr.sh_type)
    {
    case SHT_PROGBITS:
    case SHT_NOBITS:
      /* If sh_type is yet undecided, assume it could be
	 SHT_PROGBITS/SHT_NOBITS.  */
    case SHT_NULL:
      htab = elf_hash_table (info);
      if (p == htab->tls_sec)
	return FALSE;

      if (htab->text_index_section != NULL)
	return p != htab->text_index_section && p != htab->data_index_section;

      return (htab->dynobj != NULL
	      && (ip = bfd_get_linker_section (htab->dynobj, p->name)) != NULL
	      && ip->output_section == p);

      /* There shouldn't be section relative relocations
	 against any other section.  */
    default:
      return TRUE;
    }
}

bfd_boolean
_bfd_elf_omit_section_dynsym_all
    (bfd *output_bfd ATTRIBUTE_UNUSED,
     struct bfd_link_info *info ATTRIBUTE_UNUSED,
     asection *p ATTRIBUTE_UNUSED)
{
  return TRUE;
}

/* Assign dynsym indices.  In a shared library we generate a section
   symbol for each output section, which come first.  Next come symbols
   which have been forced to local binding.  Then all of the back-end
   allocated local dynamic syms, followed by the rest of the global
   symbols.  If SECTION_SYM_COUNT is NULL, section dynindx is not set.
   (This prevents the early call before elf_backend_init_index_section
   and strip_excluded_output_sections setting dynindx for sections
   that are stripped.)  */

static unsigned long
_bfd_elf_link_renumber_dynsyms (bfd *output_bfd,
				struct bfd_link_info *info,
				unsigned long *section_sym_count)
{
  unsigned long dynsymcount = 0;
  bfd_boolean do_sec = section_sym_count != NULL;

  if (bfd_link_pic (info)
      || elf_hash_table (info)->is_relocatable_executable)
    {
      const struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
      asection *p;
      for (p = output_bfd->sections; p ; p = p->next)
	if ((p->flags & SEC_EXCLUDE) == 0
	    && (p->flags & SEC_ALLOC) != 0
	    && elf_hash_table (info)->dynamic_relocs
	    && !(*bed->elf_backend_omit_section_dynsym) (output_bfd, info, p))
	  {
	    ++dynsymcount;
	    if (do_sec)
	      elf_section_data (p)->dynindx = dynsymcount;
	  }
	else if (do_sec)
	  elf_section_data (p)->dynindx = 0;
    }
  if (do_sec)
    *section_sym_count = dynsymcount;

  elf_link_hash_traverse (elf_hash_table (info),
			  elf_link_renumber_local_hash_table_dynsyms,
			  &dynsymcount);

  if (elf_hash_table (info)->dynlocal)
    {
      struct elf_link_local_dynamic_entry *p;
      for (p = elf_hash_table (info)->dynlocal; p ; p = p->next)
	p->dynindx = ++dynsymcount;
    }
  elf_hash_table (info)->local_dynsymcount = dynsymcount;

  elf_link_hash_traverse (elf_hash_table (info),
			  elf_link_renumber_hash_table_dynsyms,
			  &dynsymcount);

  /* There is an unused NULL entry at the head of the table which we
     must account for in our count even if the table is empty since it
     is intended for the mandatory DT_SYMTAB tag (.dynsym section) in
     .dynamic section.  */
  dynsymcount++;

  elf_hash_table (info)->dynsymcount = dynsymcount;
  return dynsymcount;
}

/* Merge st_other field.  */

static void
elf_merge_st_other (bfd *abfd, struct elf_link_hash_entry *h,
		    const Elf_Internal_Sym *isym, asection *sec,
		    bfd_boolean definition, bfd_boolean dynamic)
{
  const struct elf_backend_data *bed = get_elf_backend_data (abfd);

  /* If st_other has a processor-specific meaning, specific
     code might be needed here.  */
  if (bed->elf_backend_merge_symbol_attribute)
    (*bed->elf_backend_merge_symbol_attribute) (h, isym, definition,
						dynamic);

  if (!dynamic)
    {
      unsigned symvis = ELF_ST_VISIBILITY (isym->st_other);
      unsigned hvis = ELF_ST_VISIBILITY (h->other);

      /* Keep the most constraining visibility.  Leave the remainder
	 of the st_other field to elf_backend_merge_symbol_attribute.  */
      if (symvis - 1 < hvis - 1)
	h->other = symvis | (h->other & ~ELF_ST_VISIBILITY (-1));
    }
  else if (definition
	   && ELF_ST_VISIBILITY (isym->st_other) != STV_DEFAULT
	   && (sec->flags & SEC_READONLY) == 0)
    h->protected_def = 1;
}

/* This function is called when we want to merge a new symbol with an
   existing symbol.  It handles the various cases which arise when we
   find a definition in a dynamic object, or when there is already a
   definition in a dynamic object.  The new symbol is described by
   NAME, SYM, PSEC, and PVALUE.  We set SYM_HASH to the hash table
   entry.  We set POLDBFD to the old symbol's BFD.  We set POLD_WEAK
   if the old symbol was weak.  We set POLD_ALIGNMENT to the alignment
   of an old common symbol.  We set OVERRIDE if the old symbol is
   overriding a new definition.  We set TYPE_CHANGE_OK if it is OK for
   the type to change.  We set SIZE_CHANGE_OK if it is OK for the size
   to change.  By OK to change, we mean that we shouldn't warn if the
   type or size does change.  */

static bfd_boolean
_bfd_elf_merge_symbol (bfd *abfd,
		       struct bfd_link_info *info,
		       const char *name,
		       Elf_Internal_Sym *sym,
		       asection **psec,
		       bfd_vma *pvalue,
		       struct elf_link_hash_entry **sym_hash,
		       bfd **poldbfd,
		       bfd_boolean *pold_weak,
		       unsigned int *pold_alignment,
		       bfd_boolean *skip,
		       bfd_boolean *override,
		       bfd_boolean *type_change_ok,
		       bfd_boolean *size_change_ok,
		       bfd_boolean *matched)
{
  asection *sec, *oldsec;
  struct elf_link_hash_entry *h;
  struct elf_link_hash_entry *hi;
  struct elf_link_hash_entry *flip;
  int bind;
  bfd *oldbfd;
  bfd_boolean newdyn, olddyn, olddef, newdef, newdyncommon, olddyncommon;
  bfd_boolean newweak, oldweak, newfunc, oldfunc;
  const struct elf_backend_data *bed;
  char *new_version;
  bfd_boolean default_sym = *matched;

  *skip = FALSE;
  *override = FALSE;

  sec = *psec;
  bind = ELF_ST_BIND (sym->st_info);

  if (! bfd_is_und_section (sec))
    h = elf_link_hash_lookup (elf_hash_table (info), name, TRUE, FALSE, FALSE);
  else
    h = ((struct elf_link_hash_entry *)
	 bfd_wrapped_link_hash_lookup (abfd, info, name, TRUE, FALSE, FALSE));
  if (h == NULL)
    return FALSE;
  *sym_hash = h;

  bed = get_elf_backend_data (abfd);

  /* NEW_VERSION is the symbol version of the new symbol.  */
  if (h->versioned != unversioned)
    {
      /* Symbol version is unknown or versioned.  */
      new_version = strrchr (name, ELF_VER_CHR);
      if (new_version)
	{
	  if (h->versioned == unknown)
	    {
	      if (new_version > name && new_version[-1] != ELF_VER_CHR)
		h->versioned = versioned_hidden;
	      else
		h->versioned = versioned;
	    }
	  new_version += 1;
	  if (new_version[0] == '\0')
	    new_version = NULL;
	}
      else
	h->versioned = unversioned;
    }
  else
    new_version = NULL;

  /* For merging, we only care about real symbols.  But we need to make
     sure that indirect symbol dynamic flags are updated.  */
  hi = h;
  while (h->root.type == bfd_link_hash_indirect
	 || h->root.type == bfd_link_hash_warning)
    h = (struct elf_link_hash_entry *) h->root.u.i.link;

  if (!*matched)
    {
      if (hi == h || h->root.type == bfd_link_hash_new)
	*matched = TRUE;
      else
	{
	  /* OLD_HIDDEN is true if the existing symbol is only visible
	     to the symbol with the same symbol version.  NEW_HIDDEN is
	     true if the new symbol is only visible to the symbol with
	     the same symbol version.  */
	  bfd_boolean old_hidden = h->versioned == versioned_hidden;
	  bfd_boolean new_hidden = hi->versioned == versioned_hidden;
	  if (!old_hidden && !new_hidden)
	    /* The new symbol matches the existing symbol if both
	       aren't hidden.  */
	    *matched = TRUE;
	  else
	    {
	      /* OLD_VERSION is the symbol version of the existing
		 symbol. */
	      char *old_version;

	      if (h->versioned >= versioned)
		old_version = strrchr (h->root.root.string,
				       ELF_VER_CHR) + 1;
	      else
		 old_version = NULL;

	      /* The new symbol matches the existing symbol if they
		 have the same symbol version.  */
	      *matched = (old_version == new_version
			  || (old_version != NULL
			      && new_version != NULL
			      && strcmp (old_version, new_version) == 0));
	    }
	}
    }

  /* OLDBFD and OLDSEC are a BFD and an ASECTION associated with the
     existing symbol.  */

  oldbfd = NULL;
  oldsec = NULL;
  switch (h->root.type)
    {
    default:
      break;

    case bfd_link_hash_undefined:
    case bfd_link_hash_undefweak:
      oldbfd = h->root.u.undef.abfd;
      break;

    case bfd_link_hash_defined:
    case bfd_link_hash_defweak:
      oldbfd = h->root.u.def.section->owner;
      oldsec = h->root.u.def.section;
      break;

    case bfd_link_hash_common:
      oldbfd = h->root.u.c.p->section->owner;
      oldsec = h->root.u.c.p->section;
      if (pold_alignment)
	*pold_alignment = h->root.u.c.p->alignment_power;
      break;
    }
  if (poldbfd && *poldbfd == NULL)
    *poldbfd = oldbfd;

  /* Differentiate strong and weak symbols.  */
  newweak = bind == STB_WEAK;
  oldweak = (h->root.type == bfd_link_hash_defweak
	     || h->root.type == bfd_link_hash_undefweak);
  if (pold_weak)
    *pold_weak = oldweak;

  /* We have to check it for every instance since the first few may be
     references and not all compilers emit symbol type for undefined
     symbols.  */
  bfd_elf_link_mark_dynamic_symbol (info, h, sym);

  /* NEWDYN and OLDDYN indicate whether the new or old symbol,
     respectively, is from a dynamic object.  */

  newdyn = (abfd->flags & DYNAMIC) != 0;

  /* ref_dynamic_nonweak and dynamic_def flags track actual undefined
     syms and defined syms in dynamic libraries respectively.
     ref_dynamic on the other hand can be set for a symbol defined in
     a dynamic library, and def_dynamic may not be set;  When the
     definition in a dynamic lib is overridden by a definition in the
     executable use of the symbol in the dynamic lib becomes a
     reference to the executable symbol.  */
  if (newdyn)
    {
      if (bfd_is_und_section (sec))
	{
	  if (bind != STB_WEAK)
	    {
	      h->ref_dynamic_nonweak = 1;
	      hi->ref_dynamic_nonweak = 1;
	    }
	}
      else
	{
	  /* Update the existing symbol only if they match. */
	  if (*matched)
	    h->dynamic_def = 1;
	  hi->dynamic_def = 1;
	}
    }

  /* If we just created the symbol, mark it as being an ELF symbol.
     Other than that, there is nothing to do--there is no merge issue
     with a newly defined symbol--so we just return.  */

  if (h->root.type == bfd_link_hash_new)
    {
      h->non_elf = 0;
      return TRUE;
    }

  /* In cases involving weak versioned symbols, we may wind up trying
     to merge a symbol with itself.  Catch that here, to avoid the
     confusion that results if we try to override a symbol with
     itself.  The additional tests catch cases like
     _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
     dynamic object, which we do want to handle here.  */
  if (abfd == oldbfd
      && (newweak || oldweak)
      && ((abfd->flags & DYNAMIC) == 0
	  || !h->def_regular))
    return TRUE;

  olddyn = FALSE;
  if (oldbfd != NULL)
    olddyn = (oldbfd->flags & DYNAMIC) != 0;
  else if (oldsec != NULL)
    {
      /* This handles the special SHN_MIPS_{TEXT,DATA} section
	 indices used by MIPS ELF.  */
      olddyn = (oldsec->symbol->flags & BSF_DYNAMIC) != 0;
    }

  /* Handle a case where plugin_notice won't be called and thus won't
     set the non_ir_ref flags on the first pass over symbols.  */
  if (oldbfd != NULL
      && (oldbfd->flags & BFD_PLUGIN) != (abfd->flags & BFD_PLUGIN)
      && newdyn != olddyn)
    {
      h->root.non_ir_ref_dynamic = TRUE;
      hi->root.non_ir_ref_dynamic = TRUE;
    }

  /* NEWDEF and OLDDEF indicate whether the new or old symbol,
     respectively, appear to be a definition rather than reference.  */

  newdef = !bfd_is_und_section (sec) && !bfd_is_com_section (sec);

  olddef = (h->root.type != bfd_link_hash_undefined
	    && h->root.type != bfd_link_hash_undefweak
	    && h->root.type != bfd_link_hash_common);

  /* NEWFUNC and OLDFUNC indicate whether the new or old symbol,
     respectively, appear to be a function.  */

  newfunc = (ELF_ST_TYPE (sym->st_info) != STT_NOTYPE
	     && bed->is_function_type (ELF_ST_TYPE (sym->st_info)));

  oldfunc = (h->type != STT_NOTYPE
	     && bed->is_function_type (h->type));

  if (!(newfunc && oldfunc)
      && ELF_ST_TYPE (sym->st_info) != h->type
      && ELF_ST_TYPE (sym->st_info) != STT_NOTYPE
      && h->type != STT_NOTYPE
      && (newdef || bfd_is_com_section (sec))
      && (olddef || h->root.type == bfd_link_hash_common))
    {
      /* If creating a default indirect symbol ("foo" or "foo@") from
	 a dynamic versioned definition ("foo@@") skip doing so if
	 there is an existing regular definition with a different
	 type.  We don't want, for example, a "time" variable in the
	 executable overriding a "time" function in a shared library.  */
      if (newdyn
	  && !olddyn)
	{
	  *skip = TRUE;
	  return TRUE;
	}

      /* When adding a symbol from a regular object file after we have
	 created indirect symbols, undo the indirection and any
	 dynamic state.  */
      if (hi != h
	  && !newdyn
	  && olddyn)
	{
	  h = hi;
	  (*bed->elf_backend_hide_symbol) (info, h, TRUE);
	  h->forced_local = 0;
	  h->ref_dynamic = 0;
	  h->def_dynamic = 0;
	  h->dynamic_def = 0;
	  if (h->root.u.undef.next || info->hash->undefs_tail == &h->root)
	    {
	      h->root.type = bfd_link_hash_undefined;
	      h->root.u.undef.abfd = abfd;
	    }
	  else
	    {
	      h->root.type = bfd_link_hash_new;
	      h->root.u.undef.abfd = NULL;
	    }
	  return TRUE;
	}
    }

  /* Check TLS symbols.  We don't check undefined symbols introduced
     by "ld -u" which have no type (and oldbfd NULL), and we don't
     check symbols from plugins because they also have no type.  */
  if (oldbfd != NULL
      && (oldbfd->flags & BFD_PLUGIN) == 0
      && (abfd->flags & BFD_PLUGIN) == 0
      && ELF_ST_TYPE (sym->st_info) != h->type
      && (ELF_ST_TYPE (sym->st_info) == STT_TLS || h->type == STT_TLS))
    {
      bfd *ntbfd, *tbfd;
      bfd_boolean ntdef, tdef;
      asection *ntsec, *tsec;

      if (h->type == STT_TLS)
	{
	  ntbfd = abfd;
	  ntsec = sec;
	  ntdef = newdef;
	  tbfd = oldbfd;
	  tsec = oldsec;
	  tdef = olddef;
	}
      else
	{
	  ntbfd = oldbfd;
	  ntsec = oldsec;
	  ntdef = olddef;
	  tbfd = abfd;
	  tsec = sec;
	  tdef = newdef;
	}

      if (tdef && ntdef)
	_bfd_error_handler
	  /* xgettext:c-format */
	  (_("%s: TLS definition in %pB section %pA "
	     "mismatches non-TLS definition in %pB section %pA"),
	   h->root.root.string, tbfd, tsec, ntbfd, ntsec);
      else if (!tdef && !ntdef)
	_bfd_error_handler
	  /* xgettext:c-format */
	  (_("%s: TLS reference in %pB "
	     "mismatches non-TLS reference in %pB"),
	   h->root.root.string, tbfd, ntbfd);
      else if (tdef)
	_bfd_error_handler
	  /* xgettext:c-format */
	  (_("%s: TLS definition in %pB section %pA "
	     "mismatches non-TLS reference in %pB"),
	   h->root.root.string, tbfd, tsec, ntbfd);
      else
	_bfd_error_handler
	  /* xgettext:c-format */
	  (_("%s: TLS reference in %pB "
	     "mismatches non-TLS definition in %pB section %pA"),
	   h->root.root.string, tbfd, ntbfd, ntsec);

      bfd_set_error (bfd_error_bad_value);
      return FALSE;
    }

  /* If the old symbol has non-default visibility, we ignore the new
     definition from a dynamic object.  */
  if (newdyn
      && ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
      && !bfd_is_und_section (sec))
    {
      *skip = TRUE;
      /* Make sure this symbol is dynamic.  */
      h->ref_dynamic = 1;
      hi->ref_dynamic = 1;
      /* A protected symbol has external availability. Make sure it is
	 recorded as dynamic.

	 FIXME: Should we check type and size for protected symbol?  */
      if (ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
	return bfd_elf_link_record_dynamic_symbol (info, h);
      else
	return TRUE;
    }
  else if (!newdyn
	   && ELF_ST_VISIBILITY (sym->st_other) != STV_DEFAULT
	   && h->def_dynamic)
    {
      /* If the new symbol with non-default visibility comes from a
	 relocatable file and the old definition comes from a dynamic
	 object, we remove the old definition.  */
      if (hi->root.type == bfd_link_hash_indirect)
	{
	  /* Handle the case where the old dynamic definition is
	     default versioned.  We need to copy the symbol info from
	     the symbol with default version to the normal one if it
	     was referenced before.  */
	  if (h->ref_regular)
	    {
	      hi->root.type = h->root.type;
	      h->root.type = bfd_link_hash_indirect;
	      (*bed->elf_backend_copy_indirect_symbol) (info, hi, h);

	      h->root.u.i.link = (struct bfd_link_hash_entry *) hi;
	      if (ELF_ST_VISIBILITY (sym->st_other) != STV_PROTECTED)
		{
		  /* If the new symbol is hidden or internal, completely undo
		     any dynamic link state.  */
		  (*bed->elf_backend_hide_symbol) (info, h, TRUE);
		  h->forced_local = 0;
		  h->ref_dynamic = 0;
		}
	      else
		h->ref_dynamic = 1;

	      h->def_dynamic = 0;
	      /* FIXME: Should we check type and size for protected symbol?  */
	      h->size = 0;
	      h->type = 0;

	      h = hi;
	    }
	  else
	    h = hi;
	}

      /* If the old symbol was undefined before, then it will still be
	 on the undefs list.  If the new symbol is undefined or
	 common, we can't make it bfd_link_hash_new here, because new
	 undefined or common symbols will be added to the undefs list
	 by _bfd_generic_link_add_one_symbol.  Symbols may not be
	 added twice to the undefs list.  Also, if the new symbol is
	 undefweak then we don't want to lose the strong undef.  */
      if (h->root.u.undef.next || info->hash->undefs_tail == &h->root)
	{
	  h->root.type = bfd_link_hash_undefined;
	  h->root.u.undef.abfd = abfd;
	}
      else
	{
	  h->root.type = bfd_link_hash_new;
	  h->root.u.undef.abfd = NULL;
	}

      if (ELF_ST_VISIBILITY (sym->st_other) != STV_PROTECTED)
	{
	  /* If the new symbol is hidden or internal, completely undo
	     any dynamic link state.  */
	  (*bed->elf_backend_hide_symbol) (info, h, TRUE);
	  h->forced_local = 0;
	  h->ref_dynamic = 0;
	}
      else
	h->ref_dynamic = 1;
      h->def_dynamic = 0;
      /* FIXME: Should we check type and size for protected symbol?  */
      h->size = 0;
      h->type = 0;
      return TRUE;
    }

  /* If a new weak symbol definition comes from a regular file and the
     old symbol comes from a dynamic library, we treat the new one as
     strong.  Similarly, an old weak symbol definition from a regular
     file is treated as strong when the new symbol comes from a dynamic
     library.  Further, an old weak symbol from a dynamic library is
     treated as strong if the new symbol is from a dynamic library.
     This reflects the way glibc's ld.so works.

     Also allow a weak symbol to override a linker script symbol
     defined by an early pass over the script.  This is done so the
     linker knows the symbol is defined in an object file, for the
     DEFINED script function.

     Do this before setting *type_change_ok or *size_change_ok so that
     we warn properly when dynamic library symbols are overridden.  */

  if (newdef && !newdyn && (olddyn || h->root.ldscript_def))
    newweak = FALSE;
  if (olddef && newdyn)
    oldweak = FALSE;

  /* Allow changes between different types of function symbol.  */
  if (newfunc && oldfunc)
    *type_change_ok = TRUE;

  /* It's OK to change the type if either the existing symbol or the
     new symbol is weak.  A type change is also OK if the old symbol
     is undefined and the new symbol is defined.  */

  if (oldweak
      || newweak
      || (newdef
	  && h->root.type == bfd_link_hash_undefined))
    *type_change_ok = TRUE;

  /* It's OK to change the size if either the existing symbol or the
     new symbol is weak, or if the old symbol is undefined.  */

  if (*type_change_ok
      || h->root.type == bfd_link_hash_undefined)
    *size_change_ok = TRUE;

  /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
     symbol, respectively, appears to be a common symbol in a dynamic
     object.  If a symbol appears in an uninitialized section, and is
     not weak, and is not a function, then it may be a common symbol
     which was resolved when the dynamic object was created.  We want
     to treat such symbols specially, because they raise special
     considerations when setting the symbol size: if the symbol
     appears as a common symbol in a regular object, and the size in
     the regular object is larger, we must make sure that we use the
     larger size.  This problematic case can always be avoided in C,
     but it must be handled correctly when using Fortran shared
     libraries.

     Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
     likewise for OLDDYNCOMMON and OLDDEF.

     Note that this test is just a heuristic, and that it is quite
     possible to have an uninitialized symbol in a shared object which
     is really a definition, rather than a common symbol.  This could
     lead to some minor confusion when the symbol really is a common
     symbol in some regular object.  However, I think it will be
     harmless.  */

  if (newdyn
      && newdef
      && !newweak
      && (sec->flags & SEC_ALLOC) != 0
      && (sec->flags & SEC_LOAD) == 0
      && sym->st_size > 0
      && !newfunc)
    newdyncommon = TRUE;
  else
    newdyncommon = FALSE;

  if (olddyn
      && olddef
      && h->root.type == bfd_link_hash_defined
      && h->def_dynamic
      && (h->root.u.def.section->flags & SEC_ALLOC) != 0
      && (h->root.u.def.section->flags & SEC_LOAD) == 0
      && h->size > 0
      && !oldfunc)
    olddyncommon = TRUE;
  else
    olddyncommon = FALSE;

  /* We now know everything about the old and new symbols.  We ask the
     backend to check if we can merge them.  */
  if (bed->merge_symbol != NULL)
    {
      if (!bed->merge_symbol (h, sym, psec, newdef, olddef, oldbfd, oldsec))
	return FALSE;
      sec = *psec;
    }

  /* There are multiple definitions of a normal symbol.  Skip the
     default symbol as well as definition from an IR object.  */
  if (olddef && !olddyn && !oldweak && newdef && !newdyn && !newweak
      && !default_sym && h->def_regular
      && !(oldbfd != NULL
	   && (oldbfd->flags & BFD_PLUGIN) != 0
	   && (abfd->flags & BFD_PLUGIN) == 0))
    {
      /* Handle a multiple definition.  */
      (*info->callbacks->multiple_definition) (info, &h->root,
					       abfd, sec, *pvalue);
      *skip = TRUE;
      return TRUE;
    }

  /* If both the old and the new symbols look like common symbols in a
     dynamic object, set the size of the symbol to the larger of the
     two.  */

  if (olddyncommon
      && newdyncommon
      && sym->st_size != h->size)
    {
      /* Since we think we have two common symbols, issue a multiple
	 common warning if desired.  Note that we only warn if the
	 size is different.  If the size is the same, we simply let
	 the old symbol override the new one as normally happens with
	 symbols defined in dynamic objects.  */

      (*info->callbacks->multiple_common) (info, &h->root, abfd,
					   bfd_link_hash_common, sym->st_size);
      if (sym->st_size > h->size)
	h->size = sym->st_size;

      *size_change_ok = TRUE;
    }

  /* If we are looking at a dynamic object, and we have found a
     definition, we need to see if the symbol was already defined by
     some other object.  If so, we want to use the existing
     definition, and we do not want to report a multiple symbol
     definition error; we do this by clobbering *PSEC to be
     bfd_und_section_ptr.

     We treat a common symbol as a definition if the symbol in the
     shared library is a function, since common symbols always
     represent variables; this can cause confusion in principle, but
     any such confusion would seem to indicate an erroneous program or
     shared library.  We also permit a common symbol in a regular
     object to override a weak symbol in a shared object.  */

  if (newdyn
      && newdef
      && (olddef
	  || (h->root.type == bfd_link_hash_common
	      && (newweak || newfunc))))
    {
      *override = TRUE;
      newdef = FALSE;
      newdyncommon = FALSE;

      *psec = sec = bfd_und_section_ptr;
      *size_change_ok = TRUE;

      /* If we get here when the old symbol is a common symbol, then
	 we are explicitly letting it override a weak symbol or
	 function in a dynamic object, and we don't want to warn about
	 a type change.  If the old symbol is a defined symbol, a type
	 change warning may still be appropriate.  */

      if (h->root.type == bfd_link_hash_common)
	*type_change_ok = TRUE;
    }

  /* Handle the special case of an old common symbol merging with a
     new symbol which looks like a common symbol in a shared object.
     We change *PSEC and *PVALUE to make the new symbol look like a
     common symbol, and let _bfd_generic_link_add_one_symbol do the
     right thing.  */

  if (newdyncommon
      && h->root.type == bfd_link_hash_common)
    {
      *override = TRUE;
      newdef = FALSE;
      newdyncommon = FALSE;
      *pvalue = sym->st_size;
      *psec = sec = bed->common_section (oldsec);
      *size_change_ok = TRUE;
    }

  /* Skip weak definitions of symbols that are already defined.  */
  if (newdef && olddef && newweak)
    {
      /* Don't skip new non-IR weak syms.  */
      if (!(oldbfd != NULL
	    && (oldbfd->flags & BFD_PLUGIN) != 0
	    && (abfd->flags & BFD_PLUGIN) == 0))
	{
	  newdef = FALSE;
	  *skip = TRUE;
	}

      /* Merge st_other.  If the symbol already has a dynamic index,
	 but visibility says it should not be visible, turn it into a
	 local symbol.  */
      elf_merge_st_other (abfd, h, sym, sec, newdef, newdyn);
      if (h->dynindx != -1)
	switch (ELF_ST_VISIBILITY (h->other))
	  {
	  case STV_INTERNAL:
	  case STV_HIDDEN:
	    (*bed->elf_backend_hide_symbol) (info, h, TRUE);
	    break;
	  }
    }

  /* If the old symbol is from a dynamic object, and the new symbol is
     a definition which is not from a dynamic object, then the new
     symbol overrides the old symbol.  Symbols from regular files
     always take precedence over symbols from dynamic objects, even if
     they are defined after the dynamic object in the link.

     As above, we again permit a common symbol in a regular object to
     override a definition in a shared object if the shared object
     symbol is a function or is weak.  */

  flip = NULL;
  if (!newdyn
      && (newdef
	  || (bfd_is_com_section (sec)
	      && (oldweak || oldfunc)))
      && olddyn
      && olddef
      && h->def_dynamic)
    {
      /* Change the hash table entry to undefined, and let
	 _bfd_generic_link_add_one_symbol do the right thing with the
	 new definition.  */

      h->root.type = bfd_link_hash_undefined;
      h->root.u.undef.abfd = h->root.u.def.section->owner;
      *size_change_ok = TRUE;

      olddef = FALSE;
      olddyncommon = FALSE;

      /* We again permit a type change when a common symbol may be
	 overriding a function.  */

      if (bfd_is_com_section (sec))
	{
	  if (oldfunc)
	    {
	      /* If a common symbol overrides a function, make sure
		 that it isn't defined dynamically nor has type
		 function.  */
	      h->def_dynamic = 0;
	      h->type = STT_NOTYPE;
	    }
	  *type_change_ok = TRUE;
	}

      if (hi->root.type == bfd_link_hash_indirect)
	flip = hi;
      else
	/* This union may have been set to be non-NULL when this symbol
	   was seen in a dynamic object.  We must force the union to be
	   NULL, so that it is correct for a regular symbol.  */
	h->verinfo.vertree = NULL;
    }

  /* Handle the special case of a new common symbol merging with an
     old symbol that looks like it might be a common symbol defined in
     a shared object.  Note that we have already handled the case in
     which a new common symbol should simply override the definition
     in the shared library.  */

  if (! newdyn
      && bfd_is_com_section (sec)
      && olddyncommon)
    {
      /* It would be best if we could set the hash table entry to a
	 common symbol, but we don't know what to use for the section
	 or the alignment.  */
      (*info->callbacks->multiple_common) (info, &h->root, abfd,
					   bfd_link_hash_common, sym->st_size);

      /* If the presumed common symbol in the dynamic object is
	 larger, pretend that the new symbol has its size.  */

      if (h->size > *pvalue)
	*pvalue = h->size;

      /* We need to remember the alignment required by the symbol
	 in the dynamic object.  */
      BFD_ASSERT (pold_alignment);
      *pold_alignment = h->root.u.def.section->alignment_power;

      olddef = FALSE;
      olddyncommon = FALSE;

      h->root.type = bfd_link_hash_undefined;
      h->root.u.undef.abfd = h->root.u.def.section->owner;

      *size_change_ok = TRUE;
      *type_change_ok = TRUE;

      if (hi->root.type == bfd_link_hash_indirect)
	flip = hi;
      else
	h->verinfo.vertree = NULL;
    }

  if (flip != NULL)
    {
      /* Handle the case where we had a versioned symbol in a dynamic
	 library and now find a definition in a normal object.  In this
	 case, we make the versioned symbol point to the normal one.  */
      flip->root.type = h->root.type;
      flip->root.u.undef.abfd = h->root.u.undef.abfd;
      h->root.type = bfd_link_hash_indirect;
      h->root.u.i.link = (struct bfd_link_hash_entry *) flip;
      (*bed->elf_backend_copy_indirect_symbol) (info, flip, h);
      if (h->def_dynamic)
	{
	  h->def_dynamic = 0;
	  flip->ref_dynamic = 1;
	}
    }

  return TRUE;
}

/* This function is called to create an indirect symbol from the
   default for the symbol with the default version if needed. The
   symbol is described by H, NAME, SYM, SEC, and VALUE.  We
   set DYNSYM if the new indirect symbol is dynamic.  */

static bfd_boolean
_bfd_elf_add_default_symbol (bfd *abfd,
			     struct bfd_link_info *info,
			     struct elf_link_hash_entry *h,
			     const char *name,
			     Elf_Internal_Sym *sym,
			     asection *sec,
			     bfd_vma value,
			     bfd **poldbfd,
			     bfd_boolean *dynsym)
{
  bfd_boolean type_change_ok;
  bfd_boolean size_change_ok;
  bfd_boolean skip;
  char *shortname;
  struct elf_link_hash_entry *hi;
  struct bfd_link_hash_entry *bh;
  const struct elf_backend_data *bed;
  bfd_boolean collect;
  bfd_boolean dynamic;
  bfd_boolean override;
  char *p;
  size_t len, shortlen;
  asection *tmp_sec;
  bfd_boolean matched;

  if (h->versioned == unversioned || h->versioned == versioned_hidden)
    return TRUE;

  /* If this symbol has a version, and it is the default version, we
     create an indirect symbol from the default name to the fully
     decorated name.  This will cause external references which do not
     specify a version to be bound to this version of the symbol.  */
  p = strchr (name, ELF_VER_CHR);
  if (h->versioned == unknown)
    {
      if (p == NULL)
	{
	  h->versioned = unversioned;
	  return TRUE;
	}
      else
	{
	  if (p[1] != ELF_VER_CHR)
	    {
	      h->versioned = versioned_hidden;
	      return TRUE;
	    }
	  else
	    h->versioned = versioned;
	}
    }
  else
    {
      /* PR ld/19073: We may see an unversioned definition after the
	 default version.  */
      if (p == NULL)
	return TRUE;
    }

  bed = get_elf_backend_data (abfd);
  collect = bed->collect;
  dynamic = (abfd->flags & DYNAMIC) != 0;

  shortlen = p - name;
  shortname = (char *) bfd_hash_allocate (&info->hash->table, shortlen + 1);
  if (shortname == NULL)
    return FALSE;
  memcpy (shortname, name, shortlen);
  shortname[shortlen] = '\0';

  /* We are going to create a new symbol.  Merge it with any existing
     symbol with this name.  For the purposes of the merge, act as
     though we were defining the symbol we just defined, although we
     actually going to define an indirect symbol.  */
  type_change_ok = FALSE;
  size_change_ok = FALSE;
  matched = TRUE;
  tmp_sec = sec;
  if (!_bfd_elf_merge_symbol (abfd, info, shortname, sym, &tmp_sec, &value,
			      &hi, poldbfd, NULL, NULL, &skip, &override,
			      &type_change_ok, &size_change_ok, &matched))
    return FALSE;

  if (skip)
    goto nondefault;

  if (hi->def_regular)
    {
      /* If the undecorated symbol will have a version added by a
	 script different to H, then don't indirect to/from the
	 undecorated symbol.  This isn't ideal because we may not yet
	 have seen symbol versions, if given by a script on the
	 command line rather than via --version-script.  */
      if (hi->verinfo.vertree == NULL && info->version_info != NULL)
	{
	  bfd_boolean hide;

	  hi->verinfo.vertree
	    = bfd_find_version_for_sym (info->version_info,
					hi->root.root.string, &hide);
	  if (hi->verinfo.vertree != NULL && hide)
	    {
	      (*bed->elf_backend_hide_symbol) (info, hi, TRUE);
	      goto nondefault;
	    }
	}
      if (hi->verinfo.vertree != NULL
	  && strcmp (p + 1 + (p[1] == '@'), hi->verinfo.vertree->name) != 0)
	goto nondefault;
    }

  if (! override)
    {
      /* Add the default symbol if not performing a relocatable link.  */
      if (! bfd_link_relocatable (info))
	{
	  bh = &hi->root;
	  if (! (_bfd_generic_link_add_one_symbol
		 (info, abfd, shortname, BSF_INDIRECT,
		  bfd_ind_section_ptr,
		  0, name, FALSE, collect, &bh)))
	    return FALSE;
	  hi = (struct elf_link_hash_entry *) bh;
	}
    }
  else
    {
      /* In this case the symbol named SHORTNAME is overriding the
	 indirect symbol we want to add.  We were planning on making
	 SHORTNAME an indirect symbol referring to NAME.  SHORTNAME
	 is the name without a version.  NAME is the fully versioned
	 name, and it is the default version.

	 Overriding means that we already saw a definition for the
	 symbol SHORTNAME in a regular object, and it is overriding
	 the symbol defined in the dynamic object.

	 When this happens, we actually want to change NAME, the
	 symbol we just added, to refer to SHORTNAME.  This will cause
	 references to NAME in the shared object to become references
	 to SHORTNAME in the regular object.  This is what we expect
	 when we override a function in a shared object: that the
	 references in the shared object will be mapped to the
	 definition in the regular object.  */

      while (hi->root.type == bfd_link_hash_indirect
	     || hi->root.type == bfd_link_hash_warning)
	hi = (struct elf_link_hash_entry *) hi->root.u.i.link;

      h->root.type = bfd_link_hash_indirect;
      h->root.u.i.link = (struct bfd_link_hash_entry *) hi;
      if (h->def_dynamic)
	{
	  h->def_dynamic = 0;
	  hi->ref_dynamic = 1;
	  if (hi->ref_regular
	      || hi->def_regular)
	    {
	      if (! bfd_elf_link_record_dynamic_symbol (info, hi))
		return FALSE;
	    }
	}

      /* Now set HI to H, so that the following code will set the
	 other fields correctly.  */
      hi = h;
    }

  /* Check if HI is a warning symbol.  */
  if (hi->root.type == bfd_link_hash_warning)
    hi = (struct elf_link_hash_entry *) hi->root.u.i.link;

  /* If there is a duplicate definition somewhere, then HI may not
     point to an indirect symbol.  We will have reported an error to
     the user in that case.  */

  if (hi->root.type == bfd_link_hash_indirect)
    {
      struct elf_link_hash_entry *ht;

      ht = (struct elf_link_hash_entry *) hi->root.u.i.link;
      (*bed->elf_backend_copy_indirect_symbol) (info, ht, hi);

      /* A reference to the SHORTNAME symbol from a dynamic library
	 will be satisfied by the versioned symbol at runtime.  In
	 effect, we have a reference to the versioned symbol.  */
      ht->ref_dynamic_nonweak |= hi->ref_dynamic_nonweak;
      hi->dynamic_def |= ht->dynamic_def;

      /* See if the new flags lead us to realize that the symbol must
	 be dynamic.  */
      if (! *dynsym)
	{
	  if (! dynamic)
	    {
	      if (! bfd_link_executable (info)
		  || hi->def_dynamic
		  || hi->ref_dynamic)
		*dynsym = TRUE;
	    }
	  else
	    {
	      if (hi->ref_regular)
		*dynsym = TRUE;
	    }
	}
    }

  /* We also need to define an indirection from the nondefault version
     of the symbol.  */

nondefault:
  len = strlen (name);
  shortname = (char *) bfd_hash_allocate (&info->hash->table, len);
  if (shortname == NULL)
    return FALSE;
  memcpy (shortname, name, shortlen);
  memcpy (shortname + shortlen, p + 1, len - shortlen);

  /* Once again, merge with any existing symbol.  */
  type_change_ok = FALSE;
  size_change_ok = FALSE;
  tmp_sec = sec;
  if (!_bfd_elf_merge_symbol (abfd, info, shortname, sym, &tmp_sec, &value,
			      &hi, poldbfd, NULL, NULL, &skip, &override,
			      &type_change_ok, &size_change_ok, &matched))
    return FALSE;

  if (skip)
    return TRUE;

  if (override)
    {
      /* Here SHORTNAME is a versioned name, so we don't expect to see
	 the type of override we do in the case above unless it is
	 overridden by a versioned definition.  */
      if (hi->root.type != bfd_link_hash_defined
	  && hi->root.type != bfd_link_hash_defweak)
	_bfd_error_handler
	  /* xgettext:c-format */
	  (_("%pB: unexpected redefinition of indirect versioned symbol `%s'"),
	   abfd, shortname);
    }
  else
    {
      bh = &hi->root;
      if (! (_bfd_generic_link_add_one_symbol
	     (info, abfd, shortname, BSF_INDIRECT,
	      bfd_ind_section_ptr, 0, name, FALSE, collect, &bh)))
	return FALSE;
      hi = (struct elf_link_hash_entry *) bh;

      /* If there is a duplicate definition somewhere, then HI may not
	 point to an indirect symbol.  We will have reported an error
	 to the user in that case.  */

      if (hi->root.type == bfd_link_hash_indirect)
	{
	  (*bed->elf_backend_copy_indirect_symbol) (info, h, hi);
	  h->ref_dynamic_nonweak |= hi->ref_dynamic_nonweak;
	  hi->dynamic_def |= h->dynamic_def;

	  /* See if the new flags lead us to realize that the symbol
	     must be dynamic.  */
	  if (! *dynsym)
	    {
	      if (! dynamic)
		{
		  if (! bfd_link_executable (info)
		      || hi->ref_dynamic)
		    *dynsym = TRUE;
		}
	      else
		{
		  if (hi->ref_regular)
		    *dynsym = TRUE;
		}
	    }
	}
    }

  return TRUE;
}

/* This routine is used to export all defined symbols into the dynamic
   symbol table.  It is called via elf_link_hash_traverse.  */

static bfd_boolean
_bfd_elf_export_symbol (struct elf_link_hash_entry *h, void *data)
{
  struct elf_info_failed *eif = (struct elf_info_failed *) data;

  /* Ignore indirect symbols.  These are added by the versioning code.  */
  if (h->root.type == bfd_link_hash_indirect)
    return TRUE;

  /* Ignore this if we won't export it.  */
  if (!eif->info->export_dynamic && !h->dynamic)
    return TRUE;

  if (h->dynindx == -1
      && (h->def_regular || h->ref_regular)
      && ! bfd_hide_sym_by_version (eif->info->version_info,
				    h->root.root.string))
    {
      if (! bfd_elf_link_record_dynamic_symbol (eif->info, h))
	{
	  eif->failed = TRUE;
	  return FALSE;
	}
    }

  return TRUE;
}

/* Look through the symbols which are defined in other shared
   libraries and referenced here.  Update the list of version
   dependencies.  This will be put into the .gnu.version_r section.
   This function is called via elf_link_hash_traverse.  */

static bfd_boolean
_bfd_elf_link_find_version_dependencies (struct elf_link_hash_entry *h,
					 void *data)
{
  struct elf_find_verdep_info *rinfo = (struct elf_find_verdep_info *) data;
  Elf_Internal_Verneed *t;
  Elf_Internal_Vernaux *a;
  bfd_size_type amt;

  /* We only care about symbols defined in shared objects with version
     information.  */
  if (!h->def_dynamic
      || h->def_regular
      || h->dynindx == -1
      || h->verinfo.verdef == NULL
      || (elf_dyn_lib_class (h->verinfo.verdef->vd_bfd)
	  & (DYN_AS_NEEDED | DYN_DT_NEEDED | DYN_NO_NEEDED)))
    return TRUE;

  /* See if we already know about this version.  */
  for (t = elf_tdata (rinfo->info->output_bfd)->verref;
       t != NULL;
       t = t->vn_nextref)
    {
      if (t->vn_bfd != h->verinfo.verdef->vd_bfd)
	continue;

      for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
	if (a->vna_nodename == h->verinfo.verdef->vd_nodename)
	  return TRUE;

      break;
    }

  /* This is a new version.  Add it to tree we are building.  */

  if (t == NULL)
    {
      amt = sizeof *t;
      t = (Elf_Internal_Verneed *) bfd_zalloc (rinfo->info->output_bfd, amt);
      if (t == NULL)
	{
	  rinfo->failed = TRUE;
	  return FALSE;
	}

      t->vn_bfd = h->verinfo.verdef->vd_bfd;
      t->vn_nextref = elf_tdata (rinfo->info->output_bfd)->verref;
      elf_tdata (rinfo->info->output_bfd)->verref = t;
    }

  amt = sizeof *a;
  a = (Elf_Internal_Vernaux *) bfd_zalloc (rinfo->info->output_bfd, amt);
  if (a == NULL)
    {
      rinfo->failed = TRUE;
      return FALSE;
    }

  /* Note that we are copying a string pointer here, and testing it
     above.  If bfd_elf_string_from_elf_section is ever changed to
     discard the string data when low in memory, this will have to be
     fixed.  */
  a->vna_nodename = h->verinfo.verdef->vd_nodename;

  a->vna_flags = h->verinfo.verdef->vd_flags;
  a->vna_nextptr = t->vn_auxptr;

  h->verinfo.verdef->vd_exp_refno = rinfo->vers;
  ++rinfo->vers;

  a->vna_other = h->verinfo.verdef->vd_exp_refno + 1;

  t->vn_auxptr = a;

  return TRUE;
}

/* Return TRUE and set *HIDE to TRUE if the versioned symbol is
   hidden.  Set *T_P to NULL if there is no match.  */

static bfd_boolean
_bfd_elf_link_hide_versioned_symbol (struct bfd_link_info *info,
				     struct elf_link_hash_entry *h,
				     const char *version_p,
				     struct bfd_elf_version_tree **t_p,
				     bfd_boolean *hide)
{
  struct bfd_elf_version_tree *t;

  /* Look for the version.  If we find it, it is no longer weak.  */
  for (t = info->version_info; t != NULL; t = t->next)
    {
      if (strcmp (t->name, version_p) == 0)
	{
	  size_t len;
	  char *alc;
	  struct bfd_elf_version_expr *d;

	  len = version_p - h->root.root.string;
	  alc = (char *) bfd_malloc (len);
	  if (alc == NULL)
	    return FALSE;
	  memcpy (alc, h->root.root.string, len - 1);
	  alc[len - 1] = '\0';
	  if (alc[len - 2] == ELF_VER_CHR)
	    alc[len - 2] = '\0';

	  h->verinfo.vertree = t;
	  t->used = TRUE;
	  d = NULL;

	  if (t->globals.list != NULL)
	    d = (*t->match) (&t->globals, NULL, alc);

	  /* See if there is anything to force this symbol to
	     local scope.  */
	  if (d == NULL && t->locals.list != NULL)
	    {
	      d = (*t->match) (&t->locals, NULL, alc);
	      if (d != NULL
		  && h->dynindx != -1
		  && ! info->export_dynamic)
		*hide = TRUE;
	    }

	  free (alc);
	  break;
	}
    }

  *t_p = t;

  return TRUE;
}

/* Return TRUE if the symbol H is hidden by version script.  */

bfd_boolean
_bfd_elf_link_hide_sym_by_version (struct bfd_link_info *info,
				   struct elf_link_hash_entry *h)
{
  const char *p;
  bfd_boolean hide = FALSE;
  const struct elf_backend_data *bed
    = get_elf_backend_data (info->output_bfd);

  /* Version script only hides symbols defined in regular objects.  */
  if (!h->def_regular && !ELF_COMMON_DEF_P (h))
    return TRUE;

  p = strchr (h->root.root.string, ELF_VER_CHR);
  if (p != NULL && h->verinfo.vertree == NULL)
    {
      struct bfd_elf_version_tree *t;

      ++p;
      if (*p == ELF_VER_CHR)
	++p;

      if (*p != '\0'
	  && _bfd_elf_link_hide_versioned_symbol (info, h, p, &t, &hide)
	  && hide)
	{
	  if (hide)
	    (*bed->elf_backend_hide_symbol) (info, h, TRUE);
	  return TRUE;
	}
    }

  /* If we don't have a version for this symbol, see if we can find
     something.  */
  if (h->verinfo.vertree == NULL && info->version_info != NULL)
    {
      h->verinfo.vertree
	= bfd_find_version_for_sym (info->version_info,
				    h->root.root.string, &hide);
      if (h->verinfo.vertree != NULL && hide)
	{
	  (*bed->elf_backend_hide_symbol) (info, h, TRUE);
	  return TRUE;
	}
    }

  return FALSE;
}

/* Figure out appropriate versions for all the symbols.  We may not
   have the version number script until we have read all of the input
   files, so until that point we don't know which symbols should be
   local.  This function is called via elf_link_hash_traverse.  */

static bfd_boolean
_bfd_elf_link_assign_sym_version (struct elf_link_hash_entry *h, void *data)
{
  struct elf_info_failed *sinfo;
  struct bfd_link_info *info;
  const struct elf_backend_data *bed;
  struct elf_info_failed eif;
  char *p;
  bfd_boolean hide;

  sinfo = (struct elf_info_failed *) data;
  info = sinfo->info;

  /* Fix the symbol flags.  */
  eif.failed = FALSE;
  eif.info = info;
  if (! _bfd_elf_fix_symbol_flags (h, &eif))
    {
      if (eif.failed)
	sinfo->failed = TRUE;
      return FALSE;
    }

  bed = get_elf_backend_data (info->output_bfd);

  /* We only need version numbers for symbols defined in regular
     objects.  */
  if (!h->def_regular)
    {
      /* Hide symbols defined in discarded input sections.  */
      if ((h->root.type == bfd_link_hash_defined
	   || h->root.type == bfd_link_hash_defweak)
	  && discarded_section (h->root.u.def.section))
	(*bed->elf_backend_hide_symbol) (info, h, TRUE);
      return TRUE;
    }

  hide = FALSE;
  bed = get_elf_backend_data (info->output_bfd);
  p = strchr (h->root.root.string, ELF_VER_CHR);
  if (p != NULL && h->verinfo.vertree == NULL)
    {
      struct bfd_elf_version_tree *t;

      ++p;
      if (*p == ELF_VER_CHR)
	++p;

      /* If there is no version string, we can just return out.  */
      if (*p == '\0')
	return TRUE;

      if (!_bfd_elf_link_hide_versioned_symbol (info, h, p, &t, &hide))
	{
	  sinfo->failed = TRUE;
	  return FALSE;
	}

      if (hide)
	(*bed->elf_backend_hide_symbol) (info, h, TRUE);

      /* If we are building an application, we need to create a
	 version node for this version.  */
      if (t == NULL && bfd_link_executable (info))
	{
	  struct bfd_elf_version_tree **pp;
	  int version_index;

	  /* If we aren't going to export this symbol, we don't need
	     to worry about it.  */
	  if (h->dynindx == -1)
	    return TRUE;

	  t = (struct bfd_elf_version_tree *) bfd_zalloc (info->output_bfd,
							  sizeof *t);
	  if (t == NULL)
	    {
	      sinfo->failed = TRUE;
	      return FALSE;
	    }

	  t->name = p;
	  t->name_indx = (unsigned int) -1;
	  t->used = TRUE;

	  version_index = 1;
	  /* Don't count anonymous version tag.  */
	  if (sinfo->info->version_info != NULL
	      && sinfo->info->version_info->vernum == 0)
	    version_index = 0;
	  for (pp = &sinfo->info->version_info;
	       *pp != NULL;
	       pp = &(*pp)->next)
	    ++version_index;
	  t->vernum = version_index;

	  *pp = t;

	  h->verinfo.vertree = t;
	}
      else if (t == NULL)
	{
	  /* We could not find the version for a symbol when
	     generating a shared archive.  Return an error.  */
	  _bfd_error_handler
	    /* xgettext:c-format */
	    (_("%pB: version node not found for symbol %s"),
	     info->output_bfd, h->root.root.string);
	  bfd_set_error (bfd_error_bad_value);
	  sinfo->failed = TRUE;
	  return FALSE;
	}
    }

  /* If we don't have a version for this symbol, see if we can find
     something.  */
  if (!hide
      && h->verinfo.vertree == NULL
      && sinfo->info->version_info != NULL)
    {
      h->verinfo.vertree
	= bfd_find_version_for_sym (sinfo->info->version_info,
				    h->root.root.string, &hide);
      if (h->verinfo.vertree != NULL && hide)
	(*bed->elf_backend_hide_symbol) (info, h, TRUE);
    }

  return TRUE;
}

/* Read and swap the relocs from the section indicated by SHDR.  This
   may be either a REL or a RELA section.  The relocations are
   translated into RELA relocations and stored in INTERNAL_RELOCS,
   which should have already been allocated to contain enough space.
   The EXTERNAL_RELOCS are a buffer where the external form of the
   relocations should be stored.

   Returns FALSE if something goes wrong.  */

static bfd_boolean
elf_link_read_relocs_from_section (bfd *abfd,
				   asection *sec,
				   Elf_Internal_Shdr *shdr,
				   void *external_relocs,
				   Elf_Internal_Rela *internal_relocs)
{
  const struct elf_backend_data *bed;
  void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
  const bfd_byte *erela;
  const bfd_byte *erelaend;
  Elf_Internal_Rela *irela;
  Elf_Internal_Shdr *symtab_hdr;
  size_t nsyms;

  /* Position ourselves at the start of the section.  */
  if (bfd_seek (abfd, shdr->sh_offset, SEEK_SET) != 0)
    return FALSE;

  /* Read the relocations.  */
  if (bfd_bread (external_relocs, shdr->sh_size, abfd) != shdr->sh_size)
    return FALSE;

  symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
  nsyms = NUM_SHDR_ENTRIES (symtab_hdr);

  bed = get_elf_backend_data (abfd);

  /* Convert the external relocations to the internal format.  */
  if (shdr->sh_entsize == bed->s->sizeof_rel)
    swap_in = bed->s->swap_reloc_in;
  else if (shdr->sh_entsize == bed->s->sizeof_rela)
    swap_in = bed->s->swap_reloca_in;
  else
    {
      bfd_set_error (bfd_error_wrong_format);
      return FALSE;
    }

  erela = (const bfd_byte *) external_relocs;
  erelaend = erela + shdr->sh_size;
  irela = internal_relocs;
  while (erela < erelaend)
    {
      bfd_vma r_symndx;

      (*swap_in) (abfd, erela, irela);
      r_symndx = ELF32_R_SYM (irela->r_info);
      if (bed->s->arch_size == 64)
	r_symndx >>= 24;
      if (nsyms > 0)
	{
	  if ((size_t) r_symndx >= nsyms)
	    {
	      _bfd_error_handler
		/* xgettext:c-format */
		(_("%pB: bad reloc symbol index (%#" PRIx64 " >= %#lx)"
		   " for offset %#" PRIx64 " in section `%pA'"),
		 abfd, (uint64_t) r_symndx, (unsigned long) nsyms,
		 (uint64_t) irela->r_offset, sec);
	      bfd_set_error (bfd_error_bad_value);
	      return FALSE;
	    }
	}
      else if (r_symndx != STN_UNDEF)
	{
	  _bfd_error_handler
	    /* xgettext:c-format */
	    (_("%pB: non-zero symbol index (%#" PRIx64 ")"
	       " for offset %#" PRIx64 " in section `%pA'"
	       " when the object file has no symbol table"),
	     abfd, (uint64_t) r_symndx,
	     (uint64_t) irela->r_offset, sec);
	  bfd_set_error (bfd_error_bad_value);
	  return FALSE;
	}
      irela += bed->s->int_rels_per_ext_rel;
      erela += shdr->sh_entsize;
    }

  return TRUE;
}

/* Read and swap the relocs for a section O.  They may have been
   cached.  If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
   not NULL, they are used as buffers to read into.  They are known to
   be large enough.  If the INTERNAL_RELOCS relocs argument is NULL,
   the return value is allocated using either malloc or bfd_alloc,
   according to the KEEP_MEMORY argument.  If O has two relocation
   sections (both REL and RELA relocations), then the REL_HDR
   relocations will appear first in INTERNAL_RELOCS, followed by the
   RELA_HDR relocations.  */

Elf_Internal_Rela *
_bfd_elf_link_read_relocs (bfd *abfd,
			   asection *o,
			   void *external_relocs,
			   Elf_Internal_Rela *internal_relocs,
			   bfd_boolean keep_memory)
{
  void *alloc1 = NULL;
  Elf_Internal_Rela *alloc2 = NULL;
  const struct elf_backend_data *bed = get_elf_backend_data (abfd);
  struct bfd_elf_section_data *esdo = elf_section_data (o);
  Elf_Internal_Rela *internal_rela_relocs;

  if (esdo->relocs != NULL)
    return esdo->relocs;

  if (o->reloc_count == 0)
    return NULL;

  if (internal_relocs == NULL)
    {
      bfd_size_type size;

      size = (bfd_size_type) o->reloc_count * sizeof (Elf_Internal_Rela);
      if (keep_memory)
	internal_relocs = alloc2 = (Elf_Internal_Rela *) bfd_alloc (abfd, size);
      else
	internal_relocs = alloc2 = (Elf_Internal_Rela *) bfd_malloc (size);
      if (internal_relocs == NULL)
	goto error_return;
    }

  if (external_relocs == NULL)
    {
      bfd_size_type size = 0;

      if (esdo->rel.hdr)
	size += esdo->rel.hdr->sh_size;
      if (esdo->rela.hdr)
	size += esdo->rela.hdr->sh_size;

      alloc1 = bfd_malloc (size);
      if (alloc1 == NULL)
	goto error_return;
      external_relocs = alloc1;
    }

  internal_rela_relocs = internal_relocs;
  if (esdo->rel.hdr)
    {
      if (!elf_link_read_relocs_from_section (abfd, o, esdo->rel.hdr,
					      external_relocs,
					      internal_relocs))
	goto error_return;
      external_relocs = (((bfd_byte *) external_relocs)
			 + esdo->rel.hdr->sh_size);
      internal_rela_relocs += (NUM_SHDR_ENTRIES (esdo->rel.hdr)
			       * bed->s->int_rels_per_ext_rel);
    }

  if (esdo->rela.hdr
      && (!elf_link_read_relocs_from_section (abfd, o, esdo->rela.hdr,
					      external_relocs,
					      internal_rela_relocs)))
    goto error_return;

  /* Cache the results for next time, if we can.  */
  if (keep_memory)
    esdo->relocs = internal_relocs;

  if (alloc1 != NULL)
    free (alloc1);

  /* Don't free alloc2, since if it was allocated we are passing it
     back (under the name of internal_relocs).  */

  return internal_relocs;

 error_return:
  if (alloc1 != NULL)
    free (alloc1);
  if (alloc2 != NULL)
    {
      if (keep_memory)
	bfd_release (abfd, alloc2);
      else
	free (alloc2);
    }
  return NULL;
}

/* Compute the size of, and allocate space for, REL_HDR which is the
   section header for a section containing relocations for O.  */

static bfd_boolean
_bfd_elf_link_size_reloc_section (bfd *abfd,
				  struct bfd_elf_section_reloc_data *reldata)
{
  Elf_Internal_Shdr *rel_hdr = reldata->hdr;

  /* That allows us to calculate the size of the section.  */
  rel_hdr->sh_size = rel_hdr->sh_entsize * reldata->count;

  /* The contents field must last into write_object_contents, so we
     allocate it with bfd_alloc rather than malloc.  Also since we
     cannot be sure that the contents will actually be filled in,
     we zero the allocated space.  */
  rel_hdr->contents = (unsigned char *) bfd_zalloc (abfd, rel_hdr->sh_size);
  if (rel_hdr->contents == NULL && rel_hdr->sh_size != 0)
    return FALSE;

  if (reldata->hashes == NULL && reldata->count)
    {
      struct elf_link_hash_entry **p;

      p = ((struct elf_link_hash_entry **)
	   bfd_zmalloc (reldata->count * sizeof (*p)));
      if (p == NULL)
	return FALSE;

      reldata->hashes = p;
    }

  return TRUE;
}

/* Copy the relocations indicated by the INTERNAL_RELOCS (which
   originated from the section given by INPUT_REL_HDR) to the
   OUTPUT_BFD.  */

bfd_boolean
_bfd_elf_link_output_relocs (bfd *output_bfd,
			     asection *input_section,
			     Elf_Internal_Shdr *input_rel_hdr,
			     Elf_Internal_Rela *internal_relocs,
			     struct elf_link_hash_entry **rel_hash
			       ATTRIBUTE_UNUSED)
{
  Elf_Internal_Rela *irela;
  Elf_Internal_Rela *irelaend;
  bfd_byte *erel;
  struct bfd_elf_section_reloc_data *output_reldata;
  asection *output_section;
  const struct elf_backend_data *bed;
  void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
  struct bfd_elf_section_data *esdo;

  output_section = input_section->output_section;

  bed = get_elf_backend_data (output_bfd);
  esdo = elf_section_data (output_section);
  if (esdo->rel.hdr && esdo->rel.hdr->sh_entsize == input_rel_hdr->sh_entsize)
    {
      output_reldata = &esdo->rel;
      swap_out = bed->s->swap_reloc_out;
    }
  else if (esdo->rela.hdr
	   && esdo->rela.hdr->sh_entsize == input_rel_hdr->sh_entsize)
    {
      output_reldata = &esdo->rela;
      swap_out = bed->s->swap_reloca_out;
    }
  else
    {
      _bfd_error_handler
	/* xgettext:c-format */
	(_("%pB: relocation size mismatch in %pB section %pA"),
	 output_bfd, input_section->owner, input_section);
      bfd_set_error (bfd_error_wrong_format);
      return FALSE;
    }

  erel = output_reldata->hdr->contents;
  erel += output_reldata->count * input_rel_hdr->sh_entsize;
  irela = internal_relocs;
  irelaend = irela + (NUM_SHDR_ENTRIES (input_rel_hdr)
		      * bed->s->int_rels_per_ext_rel);
  while (irela < irelaend)
    {
      (*swap_out) (output_bfd, irela, erel);
      irela += bed->s->int_rels_per_ext_rel;
      erel += input_rel_hdr->sh_entsize;
    }

  /* Bump the counter, so that we know where to add the next set of
     relocations.  */
  output_reldata->count += NUM_SHDR_ENTRIES (input_rel_hdr);

  return TRUE;
}

/* Make weak undefined symbols in PIE dynamic.  */

bfd_boolean
_bfd_elf_link_hash_fixup_symbol (struct bfd_link_info *info,
				 struct elf_link_hash_entry *h)
{
  if (bfd_link_pie (info)
      && h->dynindx == -1
      && h->root.type == bfd_link_hash_undefweak)
    return bfd_elf_link_record_dynamic_symbol (info, h);

  return TRUE;
}

/* 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)
{
  const struct elf_backend_data *bed;

  /* If this symbol was mentioned in a non-ELF file, try to set
     DEF_REGULAR and REF_REGULAR correctly.  This is the only way to
     permit a non-ELF file to correctly refer to a symbol defined in
     an ELF dynamic object.  */
  if (h->non_elf)
    {
      while (h->root.type == bfd_link_hash_indirect)
	h = (struct elf_link_hash_entry *) h->root.u.i.link;

      if (h->root.type != bfd_link_hash_defined
	  && h->root.type != bfd_link_hash_defweak)
	{
	  h->ref_regular = 1;
	  h->ref_regular_nonweak = 1;
	}
      else
	{
	  if (h->root.u.def.section->owner != NULL
	      && (bfd_get_flavour (h->root.u.def.section->owner)
		  == bfd_target_elf_flavour))
	    {
	      h->ref_regular = 1;
	      h->ref_regular_nonweak = 1;
	    }
	  else
	    h->def_regular = 1;
	}

      if (h->dynindx == -1
	  && (h->def_dynamic
	      || h->ref_dynamic))
	{
	  if (! bfd_elf_link_record_dynamic_symbol (eif->info, h))
	    {
	      eif->failed = TRUE;
	      return FALSE;
	    }
	}
    }
  else
    {
      /* Unfortunately, NON_ELF is only correct if the symbol
	 was first seen in a non-ELF file.  Fortunately, if the symbol
	 was first seen in an ELF file, we're probably OK unless the
	 symbol was defined in a non-ELF file.  Catch that case here.
	 FIXME: We're still in trouble if the symbol was first seen in
	 a dynamic object, and then later in a non-ELF regular object.  */
      if ((h->root.type == bfd_link_hash_defined
	   || h->root.type == bfd_link_hash_defweak)
	  && !h->def_regular
	  && (h->root.u.def.section->owner != NULL
	      ? (bfd_get_flavour (h->root.u.def.section->owner)
		 != bfd_target_elf_flavour)
	      : (bfd_is_abs_section (h->root.u.def.section)
		 && !h->def_dynamic)))
	h->def_regular = 1;
    }

  /* Backend specific symbol fixup.  */
  bed = get_elf_backend_data (elf_hash_table (eif->info)->dynobj);
  if (bed->elf_backend_fixup_symbol
      && !(*bed->elf_backend_fixup_symbol) (eif->info, h))
    return FALSE;

  /* If this is a final link, and the symbol was defined as a common
     symbol in a regular object file, and there was no definition in
     any dynamic object, then the linker will have allocated space for
     the symbol in a common section but the DEF_REGULAR
     flag will not have been set.  */
  if (h->root.type == bfd_link_hash_defined
      && !h->def_regular
      && h->ref_regular
      && !h->def_dynamic
      && (h->root.u.def.section->owner->flags & (DYNAMIC | BFD_PLUGIN)) == 0)
    h->def_regular = 1;

  /* Symbols defined in discarded sections shouldn't be dynamic.  */
  if (h->root.type == bfd_link_hash_undefined && h->indx == -3)
    (*bed->elf_backend_hide_symbol) (eif->info, h, TRUE);

  /* If a weak undefined symbol has non-default visibility, we also
     hide it from the dynamic linker.  */
  else if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
	   && h->root.type == bfd_link_hash_undefweak)
    (*bed->elf_backend_hide_symbol) (eif->info, h, TRUE);

  /* A hidden versioned symbol in executable should be forced local if
     it is is locally defined, not referenced by shared library and not
     exported.  */
  else if (bfd_link_executable (eif->info)
	   && h->versioned == versioned_hidden
	   && !eif->info->export_dynamic
	   && !h->dynamic
	   && !h->ref_dynamic
	   && h->def_regular)
    (*bed->elf_backend_hide_symbol) (eif->info, h, TRUE);

  /* If -Bsymbolic was used (which means to bind references to global
     symbols to the definition within the shared object), and this
     symbol was defined in a regular object, then it actually doesn't
     need a PLT entry.  Likewise, if the symbol has non-default
     visibility.  If the symbol has hidden or internal visibility, we
     will force it local.  */
  else if (h->needs_plt
	   && bfd_link_pic (eif->info)
	   && is_elf_hash_table (eif->info->hash)
	   && (SYMBOLIC_BIND (eif->info, h)
	       || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
	   && h->def_regular)
    {
      bfd_boolean force_local;

      force_local = (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL
		     || ELF_ST_VISIBILITY (h->other) == STV_HIDDEN);
      (*bed->elf_backend_hide_symbol) (eif->info, h, force_local);
    }

  /* If this is a weak defined symbol in a dynamic object, and we know
     the real definition in the dynamic object, copy interesting flags
     over to the real definition.  */
  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;
}

/* Make the backend pick a good value for a dynamic symbol.  This is
   called via elf_link_hash_traverse, and also calls itself
   recursively.  */

static bfd_boolean
_bfd_elf_adjust_dynamic_symbol (struct elf_link_hash_entry *h, void *data)
{
  struct elf_info_failed *eif = (struct elf_info_failed *) data;
  struct elf_link_hash_table *htab;
  const struct elf_backend_data *bed;

  if (! is_elf_hash_table (eif->info->hash))
    return FALSE;

  /* Ignore indirect symbols.  These are added by the versioning code.  */
  if (h->root.type == bfd_link_hash_indirect)
    return TRUE;

  /* Fix the symbol flags.  */
  if (! _bfd_elf_fix_symbol_flags (h, eif))
    return FALSE;

  htab = elf_hash_table (eif->info);
  bed = get_elf_backend_data (htab->dynobj);

  if (h->root.type == bfd_link_hash_undefweak)
    {
      if (eif->info->dynamic_undefined_weak == 0)
	(*bed->elf_backend_hide_symbol) (eif->info, h, TRUE);
      else if (eif->info->dynamic_undefined_weak > 0
	       && h->ref_regular
	       && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
	       && !bfd_hide_sym_by_version (eif->info->version_info,
					    h->root.root.string))
	{
	  if (!bfd_elf_link_record_dynamic_symbol (eif->info, h))
	    {
	      eif->failed = TRUE;
	      return FALSE;
	    }
	}
    }

  /* If this symbol does not require a PLT entry, and it is not
     defined by a dynamic object, or is not referenced by a regular
     object, ignore it.  We do have to handle a weak defined symbol,
     even if no regular object refers to it, if we decided to add it
     to the dynamic symbol table.  FIXME: Do we normally need to worry
     about symbols which are defined by one dynamic object and
     referenced by another one?  */
  if (!h->needs_plt
      && h->type != STT_GNU_IFUNC
      && (h->def_regular
	  || !h->def_dynamic
	  || (!h->ref_regular
	      && (!h->is_weakalias || weakdef (h)->dynindx == -1))))
    {
      h->plt = elf_hash_table (eif->info)->init_plt_offset;
      return TRUE;
    }

  /* If we've already adjusted this symbol, don't do it again.  This
     can happen via a recursive call.  */
  if (h->dynamic_adjusted)
    return TRUE;

  /* Don't look at this symbol again.  Note that we must set this
     after checking the above conditions, because we may look at a
     symbol once, decide not to do anything, and then get called
     recursively later after REF_REGULAR is set below.  */
  h->dynamic_adjusted = 1;

  /* If this is a weak definition, and we know a real definition, and
     the real symbol is not itself defined by a regular object file,
     then get a good value for the real definition.  We handle the
     real symbol first, for the convenience of the backend routine.

     Note that there is a confusing case here.  If the real definition
     is defined by a regular object file, we don't get the real symbol
     from the dynamic object, but we do get the weak symbol.  If the
     processor backend uses a COPY reloc, then if some routine in the
     dynamic object changes the real symbol, we will not see that
     change in the corresponding weak symbol.  This is the way other
     ELF linkers work as well, and seems to be a result of the shared
     library model.

     I will clarify this issue.  Most SVR4 shared libraries define the
     variable _timezone and define timezone as a weak synonym.  The
     tzset call changes _timezone.  If you write
       extern int timezone;
       int _timezone = 5;
       int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
     you might expect that, since timezone is a synonym for _timezone,
     the same number will print both times.  However, if the processor
     backend uses a COPY reloc, then actually timezone will be copied
     into your process image, and, since you define _timezone
     yourself, _timezone will not.  Thus timezone and _timezone will
     wind up at different memory locations.  The tzset call will set
     _timezone, leaving timezone unchanged.  */

  if (h->is_weakalias)
    {
      struct elf_link_hash_entry *def = weakdef (h);

      /* If we get to this point, there is an implicit reference to
	 the alias by a regular object file via the weak symbol H.  */
      def->ref_regular = 1;

      /* Ensure that the backend adjust_dynamic_symbol function sees
	 the strong alias before H by recursively calling ourselves.  */
      if (!_bfd_elf_adjust_dynamic_symbol (def, eif))
	return FALSE;
    }

  /* If a symbol has no type and no size and does not require a PLT
     entry, then we are probably about to do the wrong thing here: we
     are probably going to create a COPY reloc for an empty object.
     This case can arise when a shared object is built with assembly
     code, and the assembly code fails to set the symbol type.  */
  if (h->size == 0
      && h->type == STT_NOTYPE
      && !h->needs_plt)
    _bfd_error_handler
      (_("warning: type and size of dynamic symbol `%s' are not defined"),
       h->root.root.string);

  if (! (*bed->elf_backend_adjust_dynamic_symbol) (eif->info, h))
    {
      eif->failed = TRUE;
      return FALSE;
    }

  return TRUE;
}

/* Adjust the dynamic symbol, H, for copy in the dynamic bss section,
   DYNBSS.  */

bfd_boolean
_bfd_elf_adjust_dynamic_copy (struct bfd_link_info *info,
			      struct elf_link_hash_entry *h,
			      asection *dynbss)
{
  unsigned int power_of_two;
  bfd_vma mask;
  asection *sec = h->root.u.def.section;

  /* The section alignment of the definition is the maximum alignment
     requirement of symbols defined in the section.  Since we don't
     know the symbol alignment requirement, we start with the
     maximum alignment and check low bits of the symbol address
     for the minimum alignment.  */
  power_of_two = bfd_get_section_alignment (sec->owner, sec);
  mask = ((bfd_vma) 1 << power_of_two) - 1;
  while ((h->root.u.def.value & mask) != 0)
    {
       mask >>= 1;
       --power_of_two;
    }

  if (power_of_two > bfd_get_section_alignment (dynbss->owner,
						dynbss))
    {
      /* Adjust the section alignment if needed.  */
      if (! bfd_set_section_alignment (dynbss->owner, dynbss,
				       power_of_two))
	return FALSE;
    }

  /* We make sure that the symbol will be aligned properly.  */
  dynbss->size = BFD_ALIGN (dynbss->size, mask + 1);

  /* Define the symbol as being at this point in DYNBSS.  */
  h->root.u.def.section = dynbss;
  h->root.u.def.value = dynbss->size;

  /* Increment the size of DYNBSS to make room for the symbol.  */
  dynbss->size += h->size;

  /* No error if extern_protected_data is true.  */
  if (h->protected_def
      && (!info->extern_protected_data
	  || (info->extern_protected_data < 0
	      && !get_elf_backend_data (dynbss->owner)->extern_protected_data)))
    info->callbacks->einfo
      (_("%P: copy reloc against protected `%pT' is dangerous\n"),
       h->root.root.string);

  return TRUE;
}

/* Adjust all external symbols pointing into SEC_MERGE sections
   to reflect the object merging within the sections.  */

static bfd_boolean
_bfd_elf_link_sec_merge_syms (struct elf_link_hash_entry *h, void *data)
{
  asection *sec;

  if ((h->root.type == bfd_link_hash_defined
       || h->root.type == bfd_link_hash_defweak)
      && ((sec = h->root.u.def.section)->flags & SEC_MERGE)
      && sec->sec_info_type == SEC_INFO_TYPE_MERGE)
    {
      bfd *output_bfd = (bfd *) data;

      h->root.u.def.value =
	_bfd_merged_section_offset (output_bfd,
				    &h->root.u.def.section,
				    elf_section_data (sec)->sec_info,
				    h->root.u.def.value);
    }

  return TRUE;
}

/* Returns false if the symbol referred to by H should be considered
   to resolve local to the current module, and true if it should be
   considered to bind dynamically.  */

bfd_boolean
_bfd_elf_dynamic_symbol_p (struct elf_link_hash_entry *h,
			   struct bfd_link_info *info,
			   bfd_boolean not_local_protected)
{
  bfd_boolean binding_stays_local_p;
  const struct elf_backend_data *bed;
  struct elf_link_hash_table *hash_table;

  if (h == NULL)
    return FALSE;

  while (h->root.type == bfd_link_hash_indirect
	 || h->root.type == bfd_link_hash_warning)
    h = (struct elf_link_hash_entry *) h->root.u.i.link;

  /* If it was forced local, then clearly it's not dynamic.  */
  if (h->dynindx == -1)
    return FALSE;
  if (h->forced_local)
    return FALSE;

  /* Identify the cases where name binding rules say that a
     visible symbol resolves locally.  */
  binding_stays_local_p = (bfd_link_executable (info)
			   || SYMBOLIC_BIND (info, h));

  switch (ELF_ST_VISIBILITY (h->other))
    {
    case STV_INTERNAL:
    case STV_HIDDEN:
      return FALSE;

    case STV_PROTECTED:
      hash_table = elf_hash_table (info);
      if (!is_elf_hash_table (hash_table))
	return FALSE;

      bed = get_elf_backend_data (hash_table->dynobj);

      /* Proper resolution for function pointer equality may require
	 that these symbols perhaps be resolved dynamically, even though
	 we should be resolving them to the current module.  */
      if (!not_local_protected || !bed->is_function_type (h->type))
	binding_stays_local_p = TRUE;
      break;

    default:
      break;
    }

  /* If it isn't defined locally, then clearly it's dynamic.  */
  if (!h->def_regular && !ELF_COMMON_DEF_P (h))
    return TRUE;

  /* Otherwise, the symbol is dynamic if binding rules don't tell
     us that it remains local.  */
  return !binding_stays_local_p;
}

/* Return true if the symbol referred to by H should be considered
   to resolve local to the current module, and false otherwise.  Differs
   from (the inverse of) _bfd_elf_dynamic_symbol_p in the treatment of
   undefined symbols.  The two functions are virtually identical except
   for the place where dynindx == -1 is tested.  If that test is true,
   _bfd_elf_dynamic_symbol_p will say the symbol is local, while
   _bfd_elf_symbol_refs_local_p will say the symbol is local only for
   defined symbols.
   It might seem that _bfd_elf_dynamic_symbol_p could be rewritten as
   !_bfd_elf_symbol_refs_local_p, except that targets differ in their
   treatment of undefined weak symbols.  For those that do not make
   undefined weak symbols dynamic, both functions may return false.  */

bfd_boolean
_bfd_elf_symbol_refs_local_p (struct elf_link_hash_entry *h,
			      struct bfd_link_info *info,
			      bfd_boolean local_protected)
{
  const struct elf_backend_data *bed;
  struct elf_link_hash_table *hash_table;

  /* If it's a local sym, of course we resolve locally.  */
  if (h == NULL)
    return TRUE;

  /* STV_HIDDEN or STV_INTERNAL ones must be local.  */
  if (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN
      || ELF_ST_VISIBILITY (h->other) == STV_INTERNAL)
    return TRUE;

  /* Forced local symbols resolve locally.  */
  if (h->forced_local)
    return TRUE;

  /* Common symbols that become definitions don't get the DEF_REGULAR
     flag set, so test it first, and don't bail out.  */
  if (ELF_COMMON_DEF_P (h))
    /* Do nothing.  */;
  /* If we don't have a definition in a regular file, then we can't
     resolve locally.  The sym is either undefined or dynamic.  */
  else if (!h->def_regular)
    return FALSE;

  /* Non-dynamic symbols resolve locally.  */
  if (h->dynindx == -1)
    return TRUE;

  /* At this point, we know the symbol is defined and dynamic.  In an
     executable it must resolve locally, likewise when building symbolic
     shared libraries.  */
  if (bfd_link_executable (info) || SYMBOLIC_BIND (info, h))
    return TRUE;

  /* Now deal with defined dynamic symbols in shared libraries.  Ones
     with default visibility might not resolve locally.  */
  if (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
    return FALSE;

  hash_table = elf_hash_table (info);
  if (!is_elf_hash_table (hash_table))
    return TRUE;

  bed = get_elf_backend_data (hash_table->dynobj);

  /* If extern_protected_data is false, STV_PROTECTED non-function
     symbols are local.  */
  if ((!info->extern_protected_data
       || (info->extern_protected_data < 0
	   && !bed->extern_protected_data))
      && !bed->is_function_type (h->type))
    return TRUE;

  /* Function pointer equality tests may require that STV_PROTECTED
     symbols be treated as dynamic symbols.  If the address of a
     function not defined in an executable is set to that function's
     plt entry in the executable, then the address of the function in
     a shared library must also be the plt entry in the executable.  */
  return local_protected;
}

/* Caches some TLS segment info, and ensures that the TLS segment vma is
   aligned.  Returns the first TLS output section.  */

struct bfd_section *
_bfd_elf_tls_setup (bfd *obfd, struct bfd_link_info *info)
{
  struct bfd_section *sec, *tls;
  unsigned int align = 0;

  for (sec = obfd->sections; sec != NULL; sec = sec->next)
    if ((sec->flags & SEC_THREAD_LOCAL) != 0)
      break;
  tls = sec;

  for (; sec != NULL && (sec->flags & SEC_THREAD_LOCAL) != 0; sec = sec->next)
    if (sec->alignment_power > align)
      align = sec->alignment_power;

  elf_hash_table (info)->tls_sec = tls;

  /* Ensure the alignment of the first section is the largest alignment,
     so that the tls segment starts aligned.  */
  if (tls != NULL)
    tls->alignment_power = align;

  return tls;
}

/* Return TRUE iff this is a non-common, definition of a non-function symbol.  */
static bfd_boolean
is_global_data_symbol_definition (bfd *abfd ATTRIBUTE_UNUSED,
				  Elf_Internal_Sym *sym)
{
  const struct elf_backend_data *bed;

  /* Local symbols do not count, but target specific ones might.  */
  if (ELF_ST_BIND (sym->st_info) != STB_GLOBAL
      && ELF_ST_BIND (sym->st_info) < STB_LOOS)
    return FALSE;

  bed = get_elf_backend_data (abfd);
  /* Function symbols do not count.  */
  if (bed->is_function_type (ELF_ST_TYPE (sym->st_info)))
    return FALSE;

  /* If the section is undefined, then so is the symbol.  */
  if (sym->st_shndx == SHN_UNDEF)
    return FALSE;

  /* If the symbol is defined in the common section, then
     it is a common definition and so does not count.  */
  if (bed->common_definition (sym))
    return FALSE;

  /* If the symbol is in a target specific section then we
     must rely upon the backend to tell us what it is.  */
  if (sym->st_shndx >= SHN_LORESERVE && sym->st_shndx < SHN_ABS)
    /* FIXME - this function is not coded yet:

       return _bfd_is_global_symbol_definition (abfd, sym);

       Instead for now assume that the definition is not global,
       Even if this is wrong, at least the linker will behave
       in the same way that it used to do.  */
    return FALSE;

  return TRUE;
}

/* Search the symbol table of the archive element of the archive ABFD
   whose archive map contains a mention of SYMDEF, and determine if
   the symbol is defined in this element.  */
static bfd_boolean
elf_link_is_defined_archive_symbol (bfd * abfd, carsym * symdef)
{
  Elf_Internal_Shdr * hdr;
  size_t symcount;
  size_t extsymcount;
  size_t extsymoff;
  Elf_Internal_Sym *isymbuf;
  Elf_Internal_Sym *isym;
  Elf_Internal_Sym *isymend;
  bfd_boolean result;

  abfd = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
  if (abfd == NULL)
    return FALSE;

  if (! bfd_check_format (abfd, bfd_object))
    return FALSE;

  /* Select the appropriate symbol table.  If we don't know if the
     object file is an IR object, give linker LTO plugin a chance to
     get the correct symbol table.  */
  if (abfd->plugin_format == bfd_plugin_yes
#if BFD_SUPPORTS_PLUGINS
      || (abfd->plugin_format == bfd_plugin_unknown
	  && bfd_link_plugin_object_p (abfd))
#endif
      )
    {
      /* Use the IR symbol table if the object has been claimed by
	 plugin.  */
      abfd = abfd->plugin_dummy_bfd;
      hdr = &elf_tdata (abfd)->symtab_hdr;
    }
  else if ((abfd->flags & DYNAMIC) == 0 || elf_dynsymtab (abfd) == 0)
    hdr = &elf_tdata (abfd)->symtab_hdr;
  else
    hdr = &elf_tdata (abfd)->dynsymtab_hdr;

  symcount = hdr->sh_size / get_elf_backend_data (abfd)->s->sizeof_sym;

  /* The sh_info field of the symtab header tells us where the
     external symbols start.  We don't care about the local symbols.  */
  if (elf_bad_symtab (abfd))
    {
      extsymcount = symcount;
      extsymoff = 0;
    }
  else
    {
      extsymcount = symcount - hdr->sh_info;
      extsymoff = hdr->sh_info;
    }

  if (extsymcount == 0)
    return FALSE;

  /* Read in the symbol table.  */
  isymbuf = bfd_elf_get_elf_syms (abfd, hdr, extsymcount, extsymoff,
				  NULL, NULL, NULL);
  if (isymbuf == NULL)
    return FALSE;

  /* Scan the symbol table looking for SYMDEF.  */
  result = FALSE;
  for (isym = isymbuf, isymend = isymbuf + extsymcount; isym < isymend; isym++)
    {
      const char *name;

      name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link,
					      isym->st_name);
      if (name == NULL)
	break;

      if (strcmp (name, symdef->name) == 0)
	{
	  result = is_global_data_symbol_definition (abfd, isym);
	  break;
	}
    }

  free (isymbuf);

  return result;
}

/* Add an entry to the .dynamic table.  */

bfd_boolean
_bfd_elf_add_dynamic_entry (struct bfd_link_info *info,
			    bfd_vma tag,
			    bfd_vma val)
{
  struct elf_link_hash_table *hash_table;
  const struct elf_backend_data *bed;
  asection *s;
  bfd_size_type newsize;
  bfd_byte *newcontents;
  Elf_Internal_Dyn dyn;

  hash_table = elf_hash_table (info);
  if (! is_elf_hash_table (hash_table))
    return FALSE;

  if (tag == DT_RELA || tag == DT_REL)
    hash_table->dynamic_relocs = TRUE;

  bed = get_elf_backend_data (hash_table->dynobj);
  s = bfd_get_linker_section (hash_table->dynobj, ".dynamic");
  BFD_ASSERT (s != NULL);

  newsize = s->size + bed->s->sizeof_dyn;
  newcontents = (bfd_byte *) bfd_realloc (s->contents, newsize);
  if (newcontents == NULL)
    return FALSE;

  dyn.d_tag = tag;
  dyn.d_un.d_val = val;
  bed->s->swap_dyn_out (hash_table->dynobj, &dyn, newcontents + s->size);

  s->size = newsize;
  s->contents = newcontents;

  return TRUE;
}

/* Add a DT_NEEDED entry for this dynamic object if DO_IT is true,
   otherwise just check whether one already exists.  Returns -1 on error,
   1 if a DT_NEEDED tag already exists, and 0 on success.  */

static int
elf_add_dt_needed_tag (bfd *abfd,
		       struct bfd_link_info *info,
		       const char *soname,
		       bfd_boolean do_it)
{
  struct elf_link_hash_table *hash_table;
  size_t strindex;

  if (!_bfd_elf_link_create_dynstrtab (abfd, info))
    return -1;

  hash_table = elf_hash_table (info);
  strindex = _bfd_elf_strtab_add (hash_table->dynstr, soname, FALSE);
  if (strindex == (size_t) -1)
    return -1;

  if (_bfd_elf_strtab_refcount (hash_table->dynstr, strindex) != 1)
    {
      asection *sdyn;
      const struct elf_backend_data *bed;
      bfd_byte *extdyn;

      bed = get_elf_backend_data (hash_table->dynobj);
      sdyn = bfd_get_linker_section (hash_table->dynobj, ".dynamic");
      if (sdyn != NULL)
	for (extdyn = sdyn->contents;
	     extdyn < sdyn->contents + sdyn->size;
	     extdyn += bed->s->sizeof_dyn)
	  {
	    Elf_Internal_Dyn dyn;

	    bed->s->swap_dyn_in (hash_table->dynobj, extdyn, &dyn);
	    if (dyn.d_tag == DT_NEEDED
		&& dyn.d_un.d_val == strindex)
	      {
		_bfd_elf_strtab_delref (hash_table->dynstr, strindex);
		return 1;
	      }
	  }
    }

  if (do_it)
    {
      if (!_bfd_elf_link_create_dynamic_sections (hash_table->dynobj, info))
	return -1;

      if (!_bfd_elf_add_dynamic_entry (info, DT_NEEDED, strindex))
	return -1;
    }
  else
    /* We were just checking for existence of the tag.  */
    _bfd_elf_strtab_delref (hash_table->dynstr, strindex);

  return 0;
}

/* Return true if SONAME is on the needed list between NEEDED and STOP
   (or the end of list if STOP is NULL), and needed by a library that
   will be loaded.  */

static bfd_boolean
on_needed_list (const char *soname,
		struct bfd_link_needed_list *needed,
		struct bfd_link_needed_list *stop)
{
  struct bfd_link_needed_list *look;
  for (look = needed; look != stop; look = look->next)
    if (strcmp (soname, look->name) == 0
	&& ((elf_dyn_lib_class (look->by) & DYN_AS_NEEDED) == 0
	    /* If needed by a library that itself is not directly
	       needed, recursively check whether that library is
	       indirectly needed.  Since we add DT_NEEDED entries to
	       the end of the list, library dependencies appear after
	       the library.  Therefore search prior to the current
	       LOOK, preventing possible infinite recursion.  */
	    || on_needed_list (elf_dt_name (look->by), needed, look)))
      return TRUE;

  return FALSE;
}

/* Sort symbol by value, section, and size.  */
static int
elf_sort_symbol (const void *arg1, const void *arg2)
{
  const struct elf_link_hash_entry *h1;
  const struct elf_link_hash_entry *h2;
  bfd_signed_vma vdiff;

  h1 = *(const struct elf_link_hash_entry **) arg1;
  h2 = *(const struct elf_link_hash_entry **) arg2;
  vdiff = h1->root.u.def.value - h2->root.u.def.value;
  if (vdiff != 0)
    return vdiff > 0 ? 1 : -1;
  else
    {
      int sdiff = h1->root.u.def.section->id - h2->root.u.def.section->id;
      if (sdiff != 0)
	return sdiff > 0 ? 1 : -1;
    }
  vdiff = h1->size - h2->size;
  return vdiff == 0 ? 0 : vdiff > 0 ? 1 : -1;
}

/* This function is used to adjust offsets into .dynstr for
   dynamic symbols.  This is called via elf_link_hash_traverse.  */

static bfd_boolean
elf_adjust_dynstr_offsets (struct elf_link_hash_entry *h, void *data)
{
  struct elf_strtab_hash *dynstr = (struct elf_strtab_hash *) data;

  if (h->dynindx != -1)
    h->dynstr_index = _bfd_elf_strtab_offset (dynstr, h->dynstr_index);
  return TRUE;
}

/* Assign string offsets in .dynstr, update all structures referencing
   them.  */

static bfd_boolean
elf_finalize_dynstr (bfd *output_bfd, struct bfd_link_info *info)
{
  struct elf_link_hash_table *hash_table = elf_hash_table (info);
  struct elf_link_local_dynamic_entry *entry;
  struct elf_strtab_hash *dynstr = hash_table->dynstr;
  bfd *dynobj = hash_table->dynobj;
  asection *sdyn;
  bfd_size_type size;
  const struct elf_backend_data *bed;
  bfd_byte *extdyn;

  _bfd_elf_strtab_finalize (dynstr);
  size = _bfd_elf_strtab_size (dynstr);

  bed = get_elf_backend_data (dynobj);
  sdyn = bfd_get_linker_section (dynobj, ".dynamic");
  BFD_ASSERT (sdyn != NULL);

  /* Update all .dynamic entries referencing .dynstr strings.  */
  for (extdyn = sdyn->contents;
       extdyn < sdyn->contents + sdyn->size;
       extdyn += bed->s->sizeof_dyn)
    {
      Elf_Internal_Dyn dyn;

      bed->s->swap_dyn_in (dynobj, extdyn, &dyn);
      switch (dyn.d_tag)
	{
	case DT_STRSZ:
	  dyn.d_un.d_val = size;
	  break;
	case DT_NEEDED:
	case DT_SONAME:
	case DT_RPATH:
	case DT_RUNPATH:
	case DT_FILTER:
	case DT_AUXILIARY:
	case DT_AUDIT:
	case DT_DEPAUDIT:
	  dyn.d_un.d_val = _bfd_elf_strtab_offset (dynstr, dyn.d_un.d_val);
	  break;
	default:
	  continue;
	}
      bed->s->swap_dyn_out (dynobj, &dyn, extdyn);
    }

  /* Now update local dynamic symbols.  */
  for (entry = hash_table->dynlocal; entry ; entry = entry->next)
    entry->isym.st_name = _bfd_elf_strtab_offset (dynstr,
						  entry->isym.st_name);

  /* And the rest of dynamic symbols.  */
  elf_link_hash_traverse (hash_table, elf_adjust_dynstr_offsets, dynstr);

  /* Adjust version definitions.  */
  if (elf_tdata (output_bfd)->cverdefs)
    {
      asection *s;
      bfd_byte *p;
      size_t i;
      Elf_Internal_Verdef def;
      Elf_Internal_Verdaux defaux;

      s = bfd_get_linker_section (dynobj, ".gnu.version_d");
      p = s->contents;
      do
	{
	  _bfd_elf_swap_verdef_in (output_bfd, (Elf_External_Verdef *) p,
				   &def);
	  p += sizeof (Elf_External_Verdef);
	  if (def.vd_aux != sizeof (Elf_External_Verdef))
	    continue;
	  for (i = 0; i < def.vd_cnt; ++i)
	    {
	      _bfd_elf_swap_verdaux_in (output_bfd,
					(Elf_External_Verdaux *) p, &defaux);
	      defaux.vda_name = _bfd_elf_strtab_offset (dynstr,
							defaux.vda_name);
	      _bfd_elf_swap_verdaux_out (output_bfd,
					 &defaux, (Elf_External_Verdaux *) p);
	      p += sizeof (Elf_External_Verdaux);
	    }
	}
      while (def.vd_next);
    }

  /* Adjust version references.  */
  if (elf_tdata (output_bfd)->verref)
    {
      asection *s;
      bfd_byte *p;
      size_t i;
      Elf_Internal_Verneed need;
      Elf_Internal_Vernaux needaux;

      s = bfd_get_linker_section (dynobj, ".gnu.version_r");
      p = s->contents;
      do
	{
	  _bfd_elf_swap_verneed_in (output_bfd, (Elf_External_Verneed *) p,
				    &need);
	  need.vn_file = _bfd_elf_strtab_offset (dynstr, need.vn_file);
	  _bfd_elf_swap_verneed_out (output_bfd, &need,
				     (Elf_External_Verneed *) p);
	  p += sizeof (Elf_External_Verneed);
	  for (i = 0; i < need.vn_cnt; ++i)
	    {
	      _bfd_elf_swap_vernaux_in (output_bfd,
					(Elf_External_Vernaux *) p, &needaux);
	      needaux.vna_name = _bfd_elf_strtab_offset (dynstr,
							 needaux.vna_name);
	      _bfd_elf_swap_vernaux_out (output_bfd,
					 &needaux,
					 (Elf_External_Vernaux *) p);
	      p += sizeof (Elf_External_Vernaux);
	    }
	}
      while (need.vn_next);
    }

  return TRUE;
}

/* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
   The default is to only match when the INPUT and OUTPUT are exactly
   the same target.  */

bfd_boolean
_bfd_elf_default_relocs_compatible (const bfd_target *input,
				    const bfd_target *output)
{
  return input == output;
}

/* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
   This version is used when different targets for the same architecture
   are virtually identical.  */

bfd_boolean
_bfd_elf_relocs_compatible (const bfd_target *input,
			    const bfd_target *output)
{
  const struct elf_backend_data *obed, *ibed;

  if (input == output)
    return TRUE;

  ibed = xvec_get_elf_backend_data (input);
  obed = xvec_get_elf_backend_data (output);

  if (ibed->arch != obed->arch)
    return FALSE;

  /* If both backends are using this function, deem them compatible.  */
  return ibed->relocs_compatible == obed->relocs_compatible;
}

/* Make a special call to the linker "notice" function to tell it that
   we are about to handle an as-needed lib, or have finished
   processing the lib.  */

bfd_boolean
_bfd_elf_notice_as_needed (bfd *ibfd,
			   struct bfd_link_info *info,
			   enum notice_asneeded_action act)
{
  return (*info->callbacks->notice) (info, NULL, NULL, ibfd, NULL, act, 0);
}

/* Check relocations an ELF object file.  */

bfd_boolean
_bfd_elf_link_check_relocs (bfd *abfd, struct bfd_link_info *info)
{
  const struct elf_backend_data *bed = get_elf_backend_data (abfd);
  struct elf_link_hash_table *htab = elf_hash_table (info);

  /* If this object is the same format as the output object, and it is
     not a shared library, then let the backend look through the
     relocs.

     This is required to build global offset table entries and to
     arrange for dynamic relocs.  It is not required for the
     particular common case of linking non PIC code, even when linking
     against shared libraries, but unfortunately there is no way of
     knowing whether an object file has been compiled PIC or not.
     Looking through the relocs is not particularly time consuming.
     The problem is that we must either (1) keep the relocs in memory,
     which causes the linker to require additional runtime memory or
     (2) read the relocs twice from the input file, which wastes time.
     This would be a good case for using mmap.

     I have no idea how to handle linking PIC code into a file of a
     different format.  It probably can't be done.  */
  if ((abfd->flags & DYNAMIC) == 0
      && is_elf_hash_table (htab)
      && bed->check_relocs != NULL
      && elf_object_id (abfd) == elf_hash_table_id (htab)
      && (*bed->relocs_compatible) (abfd->xvec, info->output_bfd->xvec))
    {
      asection *o;

      for (o = abfd->sections; o != NULL; o = o->next)
	{
	  Elf_Internal_Rela *internal_relocs;
	  bfd_boolean ok;

	  /* Don't check relocations in excluded sections.  */
	  if ((o->flags & SEC_RELOC) == 0
	      || (o->flags & SEC_EXCLUDE) != 0
	      || o->reloc_count == 0
	      || ((info->strip == strip_all || info->strip == strip_debugger)
		  && (o->flags & SEC_DEBUGGING) != 0)
	      || bfd_is_abs_section (o->output_section))
	    continue;

	  internal_relocs = _bfd_elf_link_read_relocs (abfd, o, NULL, NULL,
						       info->keep_memory);
	  if (internal_relocs == NULL)
	    return FALSE;

	  ok = (*bed->check_relocs) (abfd, info, o, internal_relocs);

	  if (elf_section_data (o)->relocs != internal_relocs)
	    free (internal_relocs);

	  if (! ok)
	    return FALSE;
	}
    }

  return TRUE;
}

/* Add symbols from an ELF object file to the linker hash table.  */

static bfd_boolean
elf_link_add_object_symbols (bfd *abfd, struct bfd_link_info *info)
{
  Elf_Internal_Ehdr *ehdr;
  Elf_Internal_Shdr *hdr;
  size_t symcount;
  size_t extsymcount;
  size_t extsymoff;
  struct elf_link_hash_entry **sym_hash;
  bfd_boolean dynamic;
  Elf_External_Versym *extversym = NULL;
  Elf_External_Versym *ever;
  struct elf_link_hash_entry *weaks;
  struct elf_link_hash_entry **nondeflt_vers = NULL;
  size_t nondeflt_vers_cnt = 0;
  Elf_Internal_Sym *isymbuf = NULL;
  Elf_Internal_Sym *isym;
  Elf_Internal_Sym *isymend;
  const struct elf_backend_data *bed;
  bfd_boolean add_needed;
  struct elf_link_hash_table *htab;
  bfd_size_type amt;
  void *alloc_mark = NULL;
  struct bfd_hash_entry **old_table = NULL;
  unsigned int old_size = 0;
  unsigned int old_count = 0;
  void *old_tab = NULL;
  void *old_ent;
  struct bfd_link_hash_entry *old_undefs = NULL;
  struct bfd_link_hash_entry *old_undefs_tail = NULL;
  void *old_strtab = NULL;
  size_t tabsize = 0;
  asection *s;
  bfd_boolean just_syms;

  htab = elf_hash_table (info);
  bed = get_elf_backend_data (abfd);

  if ((abfd->flags & DYNAMIC) == 0)
    dynamic = FALSE;
  else
    {
      dynamic = TRUE;

      /* You can't use -r against a dynamic object.  Also, there's no
	 hope of using a dynamic object which does not exactly match
	 the format of the output file.  */
      if (bfd_link_relocatable (info)
	  || !is_elf_hash_table (htab)
	  || info->output_bfd->xvec != abfd->xvec)
	{
	  if (bfd_link_relocatable (info))
	    bfd_set_error (bfd_error_invalid_operation);
	  else
	    bfd_set_error (bfd_error_wrong_format);
	  goto error_return;
	}
    }

  ehdr = elf_elfheader (abfd);
  if (info->warn_alternate_em
      && bed->elf_machine_code != ehdr->e_machine
      && ((bed->elf_machine_alt1 != 0
	   && ehdr->e_machine == bed->elf_machine_alt1)
	  || (bed->elf_machine_alt2 != 0
	      && ehdr->e_machine == bed->elf_machine_alt2)))
    _bfd_error_handler
      /* xgettext:c-format */
      (_("alternate ELF machine code found (%d) in %pB, expecting %d"),
       ehdr->e_machine, abfd, bed->elf_machine_code);

  /* As a GNU extension, any input sections which are named
     .gnu.warning.SYMBOL are treated as warning symbols for the given
     symbol.  This differs from .gnu.warning sections, which generate
     warnings when they are included in an output file.  */
  /* PR 12761: Also generate this warning when building shared libraries.  */
  for (s = abfd->sections; s != NULL; s = s->next)
    {
      const char *name;

      name = bfd_get_section_name (abfd, s);
      if (CONST_STRNEQ (name, ".gnu.warning."))
	{
	  char *msg;
	  bfd_size_type sz;

	  name += sizeof ".gnu.warning." - 1;

	  /* If this is a shared object, then look up the symbol
	     in the hash table.  If it is there, and it is already
	     been defined, then we will not be using the entry
	     from this shared object, so we don't need to warn.
	     FIXME: If we see the definition in a regular object
	     later on, we will warn, but we shouldn't.  The only
	     fix is to keep track of what warnings we are supposed
	     to emit, and then handle them all at the end of the
	     link.  */
	  if (dynamic)
	    {
	      struct elf_link_hash_entry *h;

	      h = elf_link_hash_lookup (htab, name, FALSE, FALSE, TRUE);

	      /* FIXME: What about bfd_link_hash_common?  */
	      if (h != NULL
		  && (h->root.type == bfd_link_hash_defined
		      || h->root.type == bfd_link_hash_defweak))
		continue;
	    }

	  sz = s->size;
	  msg = (char *) bfd_alloc (abfd, sz + 1);
	  if (msg == NULL)
	    goto error_return;

	  if (! bfd_get_section_contents (abfd, s, msg, 0, sz))
	    goto error_return;

	  msg[sz] = '\0';

	  if (! (_bfd_generic_link_add_one_symbol
		 (info, abfd, name, BSF_WARNING, s, 0, msg,
		  FALSE, bed->collect, NULL)))
	    goto error_return;

	  if (bfd_link_executable (info))
	    {
	      /* Clobber the section size so that the warning does
		 not get copied into the output file.  */
	      s->size = 0;

	      /* Also set SEC_EXCLUDE, so that symbols defined in
		 the warning section don't get copied to the output.  */
	      s->flags |= SEC_EXCLUDE;
	    }
	}
    }

  just_syms = ((s = abfd->sections) != NULL
	       && s->sec_info_type == SEC_INFO_TYPE_JUST_SYMS);

  add_needed = TRUE;
  if (! dynamic)
    {
      /* If we are creating a shared library, create all the dynamic
	 sections immediately.  We need to attach them to something,
	 so we attach them to this BFD, provided it is the right
	 format and is not from ld --just-symbols.  Always create the
	 dynamic sections for -E/--dynamic-list.  FIXME: If there
	 are no input BFD's of the same format as the output, we can't
	 make a shared library.  */
      if (!just_syms
	  && (bfd_link_pic (info)
	      || (!bfd_link_relocatable (info)
		  && info->nointerp
		  && (info->export_dynamic || info->dynamic)))
	  && is_elf_hash_table (htab)
	  && info->output_bfd->xvec == abfd->xvec
	  && !htab->dynamic_sections_created)
	{
	  if (! _bfd_elf_link_create_dynamic_sections (abfd, info))
	    goto error_return;
	}
    }
  else if (!is_elf_hash_table (htab))
    goto error_return;
  else
    {
      const char *soname = NULL;
      char *audit = NULL;
      struct bfd_link_needed_list *rpath = NULL, *runpath = NULL;
      const Elf_Internal_Phdr *phdr;
      int ret;

      /* ld --just-symbols and dynamic objects don't mix very well.
	 ld shouldn't allow it.  */
      if (just_syms)
	abort ();

      /* If this dynamic lib was specified on the command line with
	 --as-needed in effect, then we don't want to add a DT_NEEDED
	 tag unless the lib is actually used.  Similary for libs brought
	 in by another lib's DT_NEEDED.  When --no-add-needed is used
	 on a dynamic lib, we don't want to add a DT_NEEDED entry for
	 any dynamic library in DT_NEEDED tags in the dynamic lib at
	 all.  */
      add_needed = (elf_dyn_lib_class (abfd)
		    & (DYN_AS_NEEDED | DYN_DT_NEEDED
		       | DYN_NO_NEEDED)) == 0;

      s = bfd_get_section_by_name (abfd, ".dynamic");
      if (s != NULL)
	{
	  bfd_byte *dynbuf;
	  bfd_byte *extdyn;
	  unsigned int elfsec;
	  unsigned long shlink;

	  if (!bfd_malloc_and_get_section (abfd, s, &dynbuf))
	    {
error_free_dyn:
	      free (dynbuf);
	      goto error_return;
	    }

	  elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
	  if (elfsec == SHN_BAD)
	    goto error_free_dyn;
	  shlink = elf_elfsections (abfd)[elfsec]->sh_link;

	  for (extdyn = dynbuf;
	       extdyn < dynbuf + s->size;
	       extdyn += bed->s->sizeof_dyn)
	    {
	      Elf_Internal_Dyn dyn;

	      bed->s->swap_dyn_in (abfd, extdyn, &dyn);
	      if (dyn.d_tag == DT_SONAME)
		{
		  unsigned int tagv = dyn.d_un.d_val;
		  soname = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
		  if (soname == NULL)
		    goto error_free_dyn;
		}
	      if (dyn.d_tag == DT_NEEDED)
		{
		  struct bfd_link_needed_list *n, **pn;
		  char *fnm, *anm;
		  unsigned int tagv = dyn.d_un.d_val;

		  amt = sizeof (struct bfd_link_needed_list);
		  n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
		  fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
		  if (n == NULL || fnm == NULL)
		    goto error_free_dyn;
		  amt = strlen (fnm) + 1;
		  anm = (char *) bfd_alloc (abfd, amt);
		  if (anm == NULL)
		    goto error_free_dyn;
		  memcpy (anm, fnm, amt);
		  n->name = anm;
		  n->by = abfd;
		  n->next = NULL;
		  for (pn = &htab->needed; *pn != NULL; pn = &(*pn)->next)
		    ;
		  *pn = n;
		}
	      if (dyn.d_tag == DT_RUNPATH)
		{
		  struct bfd_link_needed_list *n, **pn;
		  char *fnm, *anm;
		  unsigned int tagv = dyn.d_un.d_val;

		  amt = sizeof (struct bfd_link_needed_list);
		  n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
		  fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
		  if (n == NULL || fnm == NULL)
		    goto error_free_dyn;
		  amt = strlen (fnm) + 1;
		  anm = (char *) bfd_alloc (abfd, amt);
		  if (anm == NULL)
		    goto error_free_dyn;
		  memcpy (anm, fnm, amt);
		  n->name = anm;
		  n->by = abfd;
		  n->next = NULL;
		  for (pn = & runpath;
		       *pn != NULL;
		       pn = &(*pn)->next)
		    ;
		  *pn = n;
		}
	      /* Ignore DT_RPATH if we have seen DT_RUNPATH.  */
	      if (!runpath && dyn.d_tag == DT_RPATH)
		{
		  struct bfd_link_needed_list *n, **pn;
		  char *fnm, *anm;
		  unsigned int tagv = dyn.d_un.d_val;

		  amt = sizeof (struct bfd_link_needed_list);
		  n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
		  fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
		  if (n == NULL || fnm == NULL)
		    goto error_free_dyn;
		  amt = strlen (fnm) + 1;
		  anm = (char *) bfd_alloc (abfd, amt);
		  if (anm == NULL)
		    goto error_free_dyn;
		  memcpy (anm, fnm, amt);
		  n->name = anm;
		  n->by = abfd;
		  n->next = NULL;
		  for (pn = & rpath;
		       *pn != NULL;
		       pn = &(*pn)->next)
		    ;
		  *pn = n;
		}
	      if (dyn.d_tag == DT_AUDIT)
		{
		  unsigned int tagv = dyn.d_un.d_val;
		  audit = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
		}
	    }

	  free (dynbuf);
	}

      /* DT_RUNPATH overrides DT_RPATH.  Do _NOT_ bfd_release, as that
	 frees all more recently bfd_alloc'd blocks as well.  */
      if (runpath)
	rpath = runpath;

      if (rpath)
	{
	  struct bfd_link_needed_list **pn;
	  for (pn = &htab->runpath; *pn != NULL; pn = &(*pn)->next)
	    ;
	  *pn = rpath;
	}

      /* If we have a PT_GNU_RELRO program header, mark as read-only
	 all sections contained fully therein.  This makes relro
	 shared library sections appear as they will at run-time.  */
      phdr = elf_tdata (abfd)->phdr + elf_elfheader (abfd)->e_phnum;
      while (--phdr >= elf_tdata (abfd)->phdr)
	if (phdr->p_type == PT_GNU_RELRO)
	  {
	    for (s = abfd->sections; s != NULL; s = s->next)
	      if ((s->flags & SEC_ALLOC) != 0
		  && s->vma >= phdr->p_vaddr
		  && s->vma + s->size <= phdr->p_vaddr + phdr->p_memsz)
		s->flags |= SEC_READONLY;
	    break;
	  }

      /* We do not want to include any of the sections in a dynamic
	 object in the output file.  We hack by simply clobbering the
	 list of sections in the BFD.  This could be handled more
	 cleanly by, say, a new section flag; the existing
	 SEC_NEVER_LOAD flag is not the one we want, because that one
	 still implies that the section takes up space in the output
	 file.  */
      bfd_section_list_clear (abfd);

      /* Find the name to use in a DT_NEEDED entry that refers to this
	 object.  If the object has a DT_SONAME entry, we use it.
	 Otherwise, if the generic linker stuck something in
	 elf_dt_name, we use that.  Otherwise, we just use the file
	 name.  */
      if (soname == NULL || *soname == '\0')
	{
	  soname = elf_dt_name (abfd);
	  if (soname == NULL || *soname == '\0')
	    soname = bfd_get_filename (abfd);
	}

      /* Save the SONAME because sometimes the linker emulation code
	 will need to know it.  */
      elf_dt_name (abfd) = soname;

      ret = elf_add_dt_needed_tag (abfd, info, soname, add_needed);
      if (ret < 0)
	goto error_return;

      /* If we have already included this dynamic object in the
	 link, just ignore it.  There is no reason to include a
	 particular dynamic object more than once.  */
      if (ret > 0)
	return TRUE;

      /* Save the DT_AUDIT entry for the linker emulation code. */
      elf_dt_audit (abfd) = audit;
    }

  /* If this is a dynamic object, we always link against the .dynsym
     symbol table, not the .symtab symbol table.  The dynamic linker
     will only see the .dynsym symbol table, so there is no reason to
     look at .symtab for a dynamic object.  */

  if (! dynamic || elf_dynsymtab (abfd) == 0)
    hdr = &elf_tdata (abfd)->symtab_hdr;
  else
    hdr = &elf_tdata (abfd)->dynsymtab_hdr;

  symcount = hdr->sh_size / bed->s->sizeof_sym;

  /* The sh_info field of the symtab header tells us where the
     external symbols start.  We don't care about the local symbols at
     this point.  */
  if (elf_bad_symtab (abfd))
    {
      extsymcount = symcount;
      extsymoff = 0;
    }
  else
    {
      extsymcount = symcount - hdr->sh_info;
      extsymoff = hdr->sh_info;
    }

  sym_hash = elf_sym_hashes (abfd);
  if (extsymcount != 0)
    {
      isymbuf = bfd_elf_get_elf_syms (abfd, hdr, extsymcount, extsymoff,
				      NULL, NULL, NULL);
      if (isymbuf == NULL)
	goto error_return;

      if (sym_hash == NULL)
	{
	  /* We store a pointer to the hash table entry for each
	     external symbol.  */
	  amt = extsymcount;
	  amt *= sizeof (struct elf_link_hash_entry *);
	  sym_hash = (struct elf_link_hash_entry **) bfd_zalloc (abfd, amt);
	  if (sym_hash == NULL)
	    goto error_free_sym;
	  elf_sym_hashes (abfd) = sym_hash;
	}
    }

  if (dynamic)
    {
      /* Read in any version definitions.  */
      if (!_bfd_elf_slurp_version_tables (abfd,
					  info->default_imported_symver))
	goto error_free_sym;

      /* Read in the symbol versions, but don't bother to convert them
	 to internal format.  */
      if (elf_dynversym (abfd) != 0)
	{
	  Elf_Internal_Shdr *versymhdr;

	  versymhdr = &elf_tdata (abfd)->dynversym_hdr;
	  extversym = (Elf_External_Versym *) bfd_malloc (versymhdr->sh_size);
	  if (extversym == NULL)
	    goto error_free_sym;
	  amt = versymhdr->sh_size;
	  if (bfd_seek (abfd, versymhdr->sh_offset, SEEK_SET) != 0
	      || bfd_bread (extversym, amt, abfd) != amt)
	    goto error_free_vers;
	}
    }

  /* If we are loading an as-needed shared lib, save the symbol table
     state before we start adding symbols.  If the lib turns out
     to be unneeded, restore the state.  */
  if ((elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0)
    {
      unsigned int i;
      size_t entsize;

      for (entsize = 0, i = 0; i < htab->root.table.size; i++)
	{
	  struct bfd_hash_entry *p;
	  struct elf_link_hash_entry *h;

	  for (p = htab->root.table.table[i]; p != NULL; p = p->next)
	    {
	      h = (struct elf_link_hash_entry *) p;
	      entsize += htab->root.table.entsize;
	      if (h->root.type == bfd_link_hash_warning)
		entsize += htab->root.table.entsize;
	    }
	}

      tabsize = htab->root.table.size * sizeof (struct bfd_hash_entry *);
      old_tab = bfd_malloc (tabsize + entsize);
      if (old_tab == NULL)
	goto error_free_vers;

      /* Remember the current objalloc pointer, so that all mem for
	 symbols added can later be reclaimed.  */
      alloc_mark = bfd_hash_allocate (&htab->root.table, 1);
      if (alloc_mark == NULL)
	goto error_free_vers;

      /* Make a special call to the linker "notice" function to
	 tell it that we are about to handle an as-needed lib.  */
      if (!(*bed->notice_as_needed) (abfd, info, notice_as_needed))
	goto error_free_vers;

      /* Clone the symbol table.  Remember some pointers into the
	 symbol table, and dynamic symbol count.  */
      old_ent = (char *) old_tab + tabsize;
      memcpy (old_tab, htab->root.table.table, tabsize);
      old_undefs = htab->root.undefs;
      old_undefs_tail = htab->root.undefs_tail;
      old_table = htab->root.table.table;
      old_size = htab->root.table.size;
      old_count = htab->root.table.count;
      old_strtab = _bfd_elf_strtab_save (htab->dynstr);
      if (old_strtab == NULL)
	goto error_free_vers;

      for (i = 0; i < htab->root.table.size; i++)
	{
	  struct bfd_hash_entry *p;
	  struct elf_link_hash_entry *h;

	  for (p = htab->root.table.table[i]; p != NULL; p = p->next)
	    {
	      memcpy (old_ent, p, htab->root.table.entsize);
	      old_ent = (char *) old_ent + htab->root.table.entsize;
	      h = (struct elf_link_hash_entry *) p;
	      if (h->root.type == bfd_link_hash_warning)
		{
		  memcpy (old_ent, h->root.u.i.link, htab->root.table.entsize);
		  old_ent = (char *) old_ent + htab->root.table.entsize;
		}
	    }
	}
    }

  weaks = NULL;
  ever = extversym != NULL ? extversym + extsymoff : NULL;
  for (isym = isymbuf, isymend = isymbuf + extsymcount;
       isym < isymend;
       isym++, sym_hash++, ever = (ever != NULL ? ever + 1 : NULL))
    {
      int bind;
      bfd_vma value;
      asection *sec, *new_sec;
      flagword flags;
      const char *name;
      struct elf_link_hash_entry *h;
      struct elf_link_hash_entry *hi;
      bfd_boolean definition;
      bfd_boolean size_change_ok;
      bfd_boolean type_change_ok;
      bfd_boolean new_weak;
      bfd_boolean old_weak;
      bfd_boolean override;
      bfd_boolean common;
      bfd_boolean discarded;
      unsigned int old_alignment;
      bfd *old_bfd;
      bfd_boolean matched;

      override = FALSE;

      flags = BSF_NO_FLAGS;
      sec = NULL;
      value = isym->st_value;
      common = bed->common_definition (isym);
      if (common && info->inhibit_common_definition)
	{
	  /* Treat common symbol as undefined for --no-define-common.  */
	  isym->st_shndx = SHN_UNDEF;
	  common = FALSE;
	}
      discarded = FALSE;

      bind = ELF_ST_BIND (isym->st_info);
      switch (bind)
	{
	case STB_LOCAL:
	  /* This should be impossible, since ELF requires that all
	     global symbols follow all local symbols, and that sh_info
	     point to the first global symbol.  Unfortunately, Irix 5
	     screws this up.  */
	  continue;

	case STB_GLOBAL:
	  if (isym->st_shndx != SHN_UNDEF && !common)
	    flags = BSF_GLOBAL;
	  break;

	case STB_WEAK:
	  flags = BSF_WEAK;
	  break;

	case STB_GNU_UNIQUE:
	  flags = BSF_GNU_UNIQUE;
	  break;

	default:
	  /* Leave it up to the processor backend.  */
	  break;
	}

      if (isym->st_shndx == SHN_UNDEF)
	sec = bfd_und_section_ptr;
      else if (isym->st_shndx == SHN_ABS)
	sec = bfd_abs_section_ptr;
      else if (isym->st_shndx == SHN_COMMON)
	{
	  sec = bfd_com_section_ptr;
	  /* What ELF calls the size we call the value.  What ELF
	     calls the value we call the alignment.  */
	  value = isym->st_size;
	}
      else
	{
	  sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
	  if (sec == NULL)
	    sec = bfd_abs_section_ptr;
	  else if (discarded_section (sec))
	    {
	      /* Symbols from discarded section are undefined.  We keep
		 its visibility.  */
	      sec = bfd_und_section_ptr;
	      discarded = TRUE;
	      isym->st_shndx = SHN_UNDEF;
	    }
	  else if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0)
	    value -= sec->vma;
	}

      name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link,
					      isym->st_name);
      if (name == NULL)
	goto error_free_vers;

      if (isym->st_shndx == SHN_COMMON
	  && (abfd->flags & BFD_PLUGIN) != 0)
	{
	  asection *xc = bfd_get_section_by_name (abfd, "COMMON");

	  if (xc == NULL)
	    {
	      flagword sflags = (SEC_ALLOC | SEC_IS_COMMON | SEC_KEEP
				 | SEC_EXCLUDE);
	      xc = bfd_make_section_with_flags (abfd, "COMMON", sflags);
	      if (xc == NULL)
		goto error_free_vers;
	    }
	  sec = xc;
	}
      else if (isym->st_shndx == SHN_COMMON
	       && ELF_ST_TYPE (isym->st_info) == STT_TLS
	       && !bfd_link_relocatable (info))
	{
	  asection *tcomm = bfd_get_section_by_name (abfd, ".tcommon");

	  if (tcomm == NULL)
	    {
	      flagword sflags = (SEC_ALLOC | SEC_THREAD_LOCAL | SEC_IS_COMMON
				 | SEC_LINKER_CREATED);
	      tcomm = bfd_make_section_with_flags (abfd, ".tcommon", sflags);
	      if (tcomm == NULL)
		goto error_free_vers;
	    }
	  sec = tcomm;
	}
      else if (bed->elf_add_symbol_hook)
	{
	  if (! (*bed->elf_add_symbol_hook) (abfd, info, isym, &name, &flags,
					     &sec, &value))
	    goto error_free_vers;

	  /* The hook function sets the name to NULL if this symbol
	     should be skipped for some reason.  */
	  if (name == NULL)
	    continue;
	}

      /* Sanity check that all possibilities were handled.  */
      if (sec == NULL)
	{
	  bfd_set_error (bfd_error_bad_value);
	  goto error_free_vers;
	}

      /* Silently discard TLS symbols from --just-syms.  There's
	 no way to combine a static TLS block with a new TLS block
	 for this executable.  */
      if (ELF_ST_TYPE (isym->st_info) == STT_TLS
	  && sec->sec_info_type == SEC_INFO_TYPE_JUST_SYMS)
	continue;

      if (bfd_is_und_section (sec)
	  || bfd_is_com_section (sec))
	definition = FALSE;
      else
	definition = TRUE;

      size_change_ok = FALSE;
      type_change_ok = bed->type_change_ok;
      old_weak = FALSE;
      matched = FALSE;
      old_alignment = 0;
      old_bfd = NULL;
      new_sec = sec;

      if (is_elf_hash_table (htab))
	{
	  Elf_Internal_Versym iver;
	  unsigned int vernum = 0;
	  bfd_boolean skip;

	  if (ever == NULL)
	    {
	      if (info->default_imported_symver)
		/* Use the default symbol version created earlier.  */
		iver.vs_vers = elf_tdata (abfd)->cverdefs;
	      else
		iver.vs_vers = 0;
	    }
	  else
	    _bfd_elf_swap_versym_in (abfd, ever, &iver);

	  vernum = iver.vs_vers & VERSYM_VERSION;

	  /* If this is a hidden symbol, or if it is not version
	     1, we append the version name to the symbol name.
	     However, we do not modify a non-hidden absolute symbol
	     if it is not a function, because it might be the version
	     symbol itself.  FIXME: What if it isn't?  */
	  if ((iver.vs_vers & VERSYM_HIDDEN) != 0
	      || (vernum > 1
		  && (!bfd_is_abs_section (sec)
		      || bed->is_function_type (ELF_ST_TYPE (isym->st_info)))))
	    {
	      const char *verstr;
	      size_t namelen, verlen, newlen;
	      char *newname, *p;

	      if (isym->st_shndx != SHN_UNDEF)
		{
		  if (vernum > elf_tdata (abfd)->cverdefs)
		    verstr = NULL;
		  else if (vernum > 1)
		    verstr =
		      elf_tdata (abfd)->verdef[vernum - 1].vd_nodename;
		  else
		    verstr = "";

		  if (verstr == NULL)
		    {
		      _bfd_error_handler
			/* xgettext:c-format */
			(_("%pB: %s: invalid version %u (max %d)"),
			 abfd, name, vernum,
			 elf_tdata (abfd)->cverdefs);
		      bfd_set_error (bfd_error_bad_value);
		      goto error_free_vers;
		    }
		}
	      else
		{
		  /* We cannot simply test for the number of
		     entries in the VERNEED section since the
		     numbers for the needed versions do not start
		     at 0.  */
		  Elf_Internal_Verneed *t;

		  verstr = NULL;
		  for (t = elf_tdata (abfd)->verref;
		       t != NULL;
		       t = t->vn_nextref)
		    {
		      Elf_Internal_Vernaux *a;

		      for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
			{
			  if (a->vna_other == vernum)
			    {
			      verstr = a->vna_nodename;
			      break;
			    }
			}
		      if (a != NULL)
			break;
		    }
		  if (verstr == NULL)
		    {
		      _bfd_error_handler
			/* xgettext:c-format */
			(_("%pB: %s: invalid needed version %d"),
			 abfd, name, vernum);
		      bfd_set_error (bfd_error_bad_value);
		      goto error_free_vers;
		    }
		}

	      namelen = strlen (name);
	      verlen = strlen (verstr);
	      newlen = namelen + verlen + 2;
	      if ((iver.vs_vers & VERSYM_HIDDEN) == 0
		  && isym->st_shndx != SHN_UNDEF)
		++newlen;

	      newname = (char *) bfd_hash_allocate (&htab->root.table, newlen);
	      if (newname == NULL)
		goto error_free_vers;
	      memcpy (newname, name, namelen);
	      p = newname + namelen;
	      *p++ = ELF_VER_CHR;
	      /* If this is a defined non-hidden version symbol,
		 we add another @ to the name.  This indicates the
		 default version of the symbol.  */
	      if ((iver.vs_vers & VERSYM_HIDDEN) == 0
		  && isym->st_shndx != SHN_UNDEF)
		*p++ = ELF_VER_CHR;
	      memcpy (p, verstr, verlen + 1);

	      name = newname;
	    }

	  /* If this symbol has default visibility and the user has
	     requested we not re-export it, then mark it as hidden.  */
	  if (!bfd_is_und_section (sec)
	      && !dynamic
	      && abfd->no_export
	      && ELF_ST_VISIBILITY (isym->st_other) != STV_INTERNAL)
	    isym->st_other = (STV_HIDDEN
			      | (isym->st_other & ~ELF_ST_VISIBILITY (-1)));

	  if (!_bfd_elf_merge_symbol (abfd, info, name, isym, &sec, &value,
				      sym_hash, &old_bfd, &old_weak,
				      &old_alignment, &skip, &override,
				      &type_change_ok, &size_change_ok,
				      &matched))
	    goto error_free_vers;

	  if (skip)
	    continue;

	  /* Override a definition only if the new symbol matches the
	     existing one.  */
	  if (override && matched)
	    definition = FALSE;

	  h = *sym_hash;
	  while (h->root.type == bfd_link_hash_indirect
		 || h->root.type == bfd_link_hash_warning)
	    h = (struct elf_link_hash_entry *) h->root.u.i.link;

	  if (elf_tdata (abfd)->verdef != NULL
	      && vernum > 1
	      && definition)
	    h->verinfo.verdef = &elf_tdata (abfd)->verdef[vernum - 1];
	}

      if (! (_bfd_generic_link_add_one_symbol
	     (info, abfd, name, flags, sec, value, NULL, FALSE, bed->collect,
	      (struct bfd_link_hash_entry **) sym_hash)))
	goto error_free_vers;

      if ((abfd->flags & DYNAMIC) == 0
	  && (bfd_get_flavour (info->output_bfd)
	      == bfd_target_elf_flavour))
	{
	  if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
	    elf_tdata (info->output_bfd)->has_gnu_symbols
	      |= elf_gnu_symbol_ifunc;
	  if ((flags & BSF_GNU_UNIQUE))
	    elf_tdata (info->output_bfd)->has_gnu_symbols
	      |= elf_gnu_symbol_unique;
	}

      h = *sym_hash;
      /* We need to make sure that indirect symbol dynamic flags are
	 updated.  */
      hi = h;
      while (h->root.type == bfd_link_hash_indirect
	     || h->root.type == bfd_link_hash_warning)
	h = (struct elf_link_hash_entry *) h->root.u.i.link;

      /* Setting the index to -3 tells elf_link_output_extsym that
	 this symbol is defined in a discarded section.  */
      if (discarded)
	h->indx = -3;

      *sym_hash = h;

      new_weak = (flags & BSF_WEAK) != 0;
      if (dynamic
	  && definition
	  && new_weak
	  && !bed->is_function_type (ELF_ST_TYPE (isym->st_info))
	  && is_elf_hash_table (htab)
	  && h->u.alias == NULL)
	{
	  /* Keep a list of all weak defined non function symbols from
	     a dynamic object, using the alias field.  Later in this
	     function we will set the alias field to the correct
	     value.  We only put non-function symbols from dynamic
	     objects on this list, because that happens to be the only
	     time we need to know the normal symbol corresponding to a
	     weak symbol, and the information is time consuming to
	     figure out.  If the alias field is not already NULL,
	     then this symbol was already defined by some previous
	     dynamic object, and we will be using that previous
	     definition anyhow.  */

	  h->u.alias = weaks;
	  weaks = h;
	}

      /* Set the alignment of a common symbol.  */
      if ((common || bfd_is_com_section (sec))
	  && h->root.type == bfd_link_hash_common)
	{
	  unsigned int align;

	  if (common)
	    align = bfd_log2 (isym->st_value);
	  else
	    {
	      /* The new symbol is a common symbol in a shared object.
		 We need to get the alignment from the section.  */
	      align = new_sec->alignment_power;
	    }
	  if (align > old_alignment)
	    h->root.u.c.p->alignment_power = align;
	  else
	    h->root.u.c.p->alignment_power = old_alignment;
	}

      if (is_elf_hash_table (htab))
	{
	  /* Set a flag in the hash table entry indicating the type of
	     reference or definition we just found.  A dynamic symbol
	     is one which is referenced or defined by both a regular
	     object and a shared object.  */
	  bfd_boolean dynsym = FALSE;

	  /* Plugin symbols aren't normal.  Don't set def_regular or
	     ref_regular for them, or make them dynamic.  */
	  if ((abfd->flags & BFD_PLUGIN) != 0)
	    ;
	  else if (! dynamic)
	    {
	      if (! definition)
		{
		  h->ref_regular = 1;
		  if (bind != STB_WEAK)
		    h->ref_regular_nonweak = 1;
		}
	      else
		{
		  h->def_regular = 1;
		  if (h->def_dynamic)
		    {
		      h->def_dynamic = 0;
		      h->ref_dynamic = 1;
		    }
		}

	      /* If the indirect symbol has been forced local, don't
		 make the real symbol dynamic.  */
	      if ((h == hi || !hi->forced_local)
		  && (bfd_link_dll (info)
		      || h->def_dynamic
		      || h->ref_dynamic))
		dynsym = TRUE;
	    }
	  else
	    {
	      if (! definition)
		{
		  h->ref_dynamic = 1;
		  hi->ref_dynamic = 1;
		}
	      else
		{
		  h->def_dynamic = 1;
		  hi->def_dynamic = 1;
		}

	      /* If the indirect symbol has been forced local, don't
		 make the real symbol dynamic.  */
	      if ((h == hi || !hi->forced_local)
		  && (h->def_regular
		      || h->ref_regular
		      || (h->is_weakalias
			  && weakdef (h)->dynindx != -1)))
		dynsym = TRUE;
	    }

	  /* Check to see if we need to add an indirect symbol for
	     the default name.  */
	  if (definition
	      || (!override && h->root.type == bfd_link_hash_common))
	    if (!_bfd_elf_add_default_symbol (abfd, info, h, name, isym,
					      sec, value, &old_bfd, &dynsym))
	      goto error_free_vers;

	  /* Check the alignment when a common symbol is involved. This
	     can change when a common symbol is overridden by a normal
	     definition or a common symbol is ignored due to the old
	     normal definition. We need to make sure the maximum
	     alignment is maintained.  */
	  if ((old_alignment || common)
	      && h->root.type != bfd_link_hash_common)
	    {
	      unsigned int common_align;
	      unsigned int normal_align;
	      unsigned int symbol_align;
	      bfd *normal_bfd;
	      bfd *common_bfd;

	      BFD_ASSERT (h->root.type == bfd_link_hash_defined
			  || h->root.type == bfd_link_hash_defweak);

	      symbol_align = ffs (h->root.u.def.value) - 1;
	      if (h->root.u.def.section->owner != NULL
		  && (h->root.u.def.section->owner->flags
		       & (DYNAMIC | BFD_PLUGIN)) == 0)
		{
		  normal_align = h->root.u.def.section->alignment_power;
		  if (normal_align > symbol_align)
		    normal_align = symbol_align;
		}
	      else
		normal_align = symbol_align;

	      if (old_alignment)
		{
		  common_align = old_alignment;
		  common_bfd = old_bfd;
		  normal_bfd = abfd;
		}
	      else
		{
		  common_align = bfd_log2 (isym->st_value);
		  common_bfd = abfd;
		  normal_bfd = old_bfd;
		}

	      if (normal_align < common_align)
		{
		  /* PR binutils/2735 */
		  if (normal_bfd == NULL)
		    _bfd_error_handler
		      /* xgettext:c-format */
		      (_("warning: alignment %u of common symbol `%s' in %pB is"
			 " greater than the alignment (%u) of its section %pA"),
		       1 << common_align, name, common_bfd,
		       1 << normal_align, h->root.u.def.section);
		  else
		    _bfd_error_handler
		      /* xgettext:c-format */
		      (_("warning: alignment %u of symbol `%s' in %pB"
			 " is smaller than %u in %pB"),
		       1 << normal_align, name, normal_bfd,
		       1 << common_align, common_bfd);
		}
	    }

	  /* Remember the symbol size if it isn't undefined.  */
	  if (isym->st_size != 0
	      && isym->st_shndx != SHN_UNDEF
	      && (definition || h->size == 0))
	    {
	      if (h->size != 0
		  && h->size != isym->st_size
		  && ! size_change_ok)
		_bfd_error_handler
		  /* xgettext:c-format */
		  (_("warning: size of symbol `%s' changed"
		     " from %" PRIu64 " in %pB to %" PRIu64 " in %pB"),
		   name, (uint64_t) h->size, old_bfd,
		   (uint64_t) isym->st_size, abfd);

	      h->size = isym->st_size;
	    }

	  /* If this is a common symbol, then we always want H->SIZE
	     to be the size of the common symbol.  The code just above
	     won't fix the size if a common symbol becomes larger.  We
	     don't warn about a size change here, because that is
	     covered by --warn-common.  Allow changes between different
	     function types.  */
	  if (h->root.type == bfd_link_hash_common)
	    h->size = h->root.u.c.size;

	  if (ELF_ST_TYPE (isym->st_info) != STT_NOTYPE
	      && ((definition && !new_weak)
		  || (old_weak && h->root.type == bfd_link_hash_common)
		  || h->type == STT_NOTYPE))
	    {
	      unsigned int type = ELF_ST_TYPE (isym->st_info);

	      /* Turn an IFUNC symbol from a DSO into a normal FUNC
		 symbol.  */
	      if (type == STT_GNU_IFUNC
		  && (abfd->flags & DYNAMIC) != 0)
		type = STT_FUNC;

	      if (h->type != type)
		{
		  if (h->type != STT_NOTYPE && ! type_change_ok)
		    /* xgettext:c-format */
		    _bfd_error_handler
		      (_("warning: type of symbol `%s' changed"
			 " from %d to %d in %pB"),
		       name, h->type, type, abfd);

		  h->type = type;
		}
	    }

	  /* Merge st_other field.  */
	  elf_merge_st_other (abfd, h, isym, sec, definition, dynamic);

	  /* We don't want to make debug symbol dynamic.  */
	  if (definition
	      && (sec->flags & SEC_DEBUGGING)
	      && !bfd_link_relocatable (info))
	    dynsym = FALSE;

	  /* Nor should we make plugin symbols dynamic.  */
	  if ((abfd->flags & BFD_PLUGIN) != 0)
	    dynsym = FALSE;

	  if (definition)
	    {
	      h->target_internal = isym->st_target_internal;
	      h->unique_global = (flags & BSF_GNU_UNIQUE) != 0;
	    }

	  if (definition && !dynamic)
	    {
	      char *p = strchr (name, ELF_VER_CHR);
	      if (p != NULL && p[1] != ELF_VER_CHR)
		{
		  /* Queue non-default versions so that .symver x, x@FOO
		     aliases can be checked.  */
		  if (!nondeflt_vers)
		    {
		      amt = ((isymend - isym + 1)
			     * sizeof (struct elf_link_hash_entry *));
		      nondeflt_vers
			= (struct elf_link_hash_entry **) bfd_malloc (amt);
		      if (!nondeflt_vers)
			goto error_free_vers;
		    }
		  nondeflt_vers[nondeflt_vers_cnt++] = h;
		}
	    }

	  if (dynsym && h->dynindx == -1)
	    {
	      if (! bfd_elf_link_record_dynamic_symbol (info, h))
		goto error_free_vers;
	      if (h->is_weakalias
		  && weakdef (h)->dynindx == -1)
		{
		  if (!bfd_elf_link_record_dynamic_symbol (info, weakdef (h)))
		    goto error_free_vers;
		}
	    }
	  else if (h->dynindx != -1)
	    /* If the symbol already has a dynamic index, but
	       visibility says it should not be visible, turn it into
	       a local symbol.  */
	    switch (ELF_ST_VISIBILITY (h->other))
	      {
	      case STV_INTERNAL:
	      case STV_HIDDEN:
		(*bed->elf_backend_hide_symbol) (info, h, TRUE);
		dynsym = FALSE;
		break;
	      }

	  /* Don't add DT_NEEDED for references from the dummy bfd nor
	     for unmatched symbol.  */
	  if (!add_needed
	      && matched
	      && definition
	      && ((dynsym
		   && h->ref_regular_nonweak
		   && (old_bfd == NULL
		       || (old_bfd->flags & BFD_PLUGIN) == 0))
		  || (h->ref_dynamic_nonweak
		      && (elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0
		      && !on_needed_list (elf_dt_name (abfd),
					  htab->needed, NULL))))
	    {
	      int ret;
	      const char *soname = elf_dt_name (abfd);

	      info->callbacks->minfo ("%!", soname, old_bfd,
				      h->root.root.string);

	      /* A symbol from a library loaded via DT_NEEDED of some
		 other library is referenced by a regular object.
		 Add a DT_NEEDED entry for it.  Issue an error if
		 --no-add-needed is used and the reference was not
		 a weak one.  */
	      if (old_bfd != NULL
		  && (elf_dyn_lib_class (abfd) & DYN_NO_NEEDED) != 0)
		{
		  _bfd_error_handler
		    /* xgettext:c-format */
		    (_("%pB: undefined reference to symbol '%s'"),
		     old_bfd, name);
		  bfd_set_error (bfd_error_missing_dso);
		  goto error_free_vers;
		}

	      elf_dyn_lib_class (abfd) = (enum dynamic_lib_link_class)
		(elf_dyn_lib_class (abfd) & ~DYN_AS_NEEDED);

	      add_needed = TRUE;
	      ret = elf_add_dt_needed_tag (abfd, info, soname, add_needed);
	      if (ret < 0)
		goto error_free_vers;

	      BFD_ASSERT (ret == 0);
	    }
	}
    }

  if (info->lto_plugin_active
      && !bfd_link_relocatable (info)
      && (abfd->flags & BFD_PLUGIN) == 0
      && !just_syms
      && extsymcount)
    {
      int r_sym_shift;

      if (bed->s->arch_size == 32)
	r_sym_shift = 8;
      else
	r_sym_shift = 32;

      /* If linker plugin is enabled, set non_ir_ref_regular on symbols
	 referenced in regular objects so that linker plugin will get
	 the correct symbol resolution.  */

      sym_hash = elf_sym_hashes (abfd);
      for (s = abfd->sections; s != NULL; s = s->next)
	{
	  Elf_Internal_Rela *internal_relocs;
	  Elf_Internal_Rela *rel, *relend;

	  /* Don't check relocations in excluded sections.  */
	  if ((s->flags & SEC_RELOC) == 0
	      || s->reloc_count == 0
	      || (s->flags & SEC_EXCLUDE) != 0
	      || ((info->strip == strip_all
		   || info->strip == strip_debugger)
		  && (s->flags & SEC_DEBUGGING) != 0))
	    continue;

	  internal_relocs = _bfd_elf_link_read_relocs (abfd, s, NULL,
						       NULL,
						       info->keep_memory);
	  if (internal_relocs == NULL)
	    goto error_free_vers;

	  rel = internal_relocs;
	  relend = rel + s->reloc_count;
	  for ( ; rel < relend; rel++)
	    {
	      unsigned long r_symndx = rel->r_info >> r_sym_shift;
	      struct elf_link_hash_entry *h;

	      /* Skip local symbols.  */
	      if (r_symndx < extsymoff)
		continue;

	      h = sym_hash[r_symndx - extsymoff];
	      if (h != NULL)
		h->root.non_ir_ref_regular = 1;
	    }

	  if (elf_section_data (s)->relocs != internal_relocs)
	    free (internal_relocs);
	}
    }

  if (extversym != NULL)
    {
      free (extversym);
      extversym = NULL;
    }

  if (isymbuf != NULL)
    {
      free (isymbuf);
      isymbuf = NULL;
    }

  if ((elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0)
    {
      unsigned int i;

      /* Restore the symbol table.  */
      old_ent = (char *) old_tab + tabsize;
      memset (elf_sym_hashes (abfd), 0,
	      extsymcount * sizeof (struct elf_link_hash_entry *));
      htab->root.table.table = old_table;
      htab->root.table.size = old_size;
      htab->root.table.count = old_count;
      memcpy (htab->root.table.table, old_tab, tabsize);
      htab->root.undefs = old_undefs;
      htab->root.undefs_tail = old_undefs_tail;
      _bfd_elf_strtab_restore (htab->dynstr, old_strtab);
      free (old_strtab);
      old_strtab = NULL;
      for (i = 0; i < htab->root.table.size; i++)
	{
	  struct bfd_hash_entry *p;
	  struct elf_link_hash_entry *h;
	  bfd_size_type size;
	  unsigned int alignment_power;
	  unsigned int non_ir_ref_dynamic;

	  for (p = htab->root.table.table[i]; p != NULL; p = p->next)
	    {
	      h = (struct elf_link_hash_entry *) p;
	      if (h->root.type == bfd_link_hash_warning)
		h = (struct elf_link_hash_entry *) h->root.u.i.link;

	      /* Preserve the maximum alignment and size for common
		 symbols even if this dynamic lib isn't on DT_NEEDED
		 since it can still be loaded at run time by another
		 dynamic lib.  */
	      if (h->root.type == bfd_link_hash_common)
		{
		  size = h->root.u.c.size;
		  alignment_power = h->root.u.c.p->alignment_power;
		}
	      else
		{
		  size = 0;
		  alignment_power = 0;
		}
	      /* Preserve non_ir_ref_dynamic so that this symbol
		 will be exported when the dynamic lib becomes needed
		 in the second pass.  */
	      non_ir_ref_dynamic = h->root.non_ir_ref_dynamic;
	      memcpy (p, old_ent, htab->root.table.entsize);
	      old_ent = (char *) old_ent + htab->root.table.entsize;
	      h = (struct elf_link_hash_entry *) p;
	      if (h->root.type == bfd_link_hash_warning)
		{
		  memcpy (h->root.u.i.link, old_ent, htab->root.table.entsize);
		  old_ent = (char *) old_ent + htab->root.table.entsize;
		  h = (struct elf_link_hash_entry *) h->root.u.i.link;
		}
	      if (h->root.type == bfd_link_hash_common)
		{
		  if (size > h->root.u.c.size)
		    h->root.u.c.size = size;
		  if (alignment_power > h->root.u.c.p->alignment_power)
		    h->root.u.c.p->alignment_power = alignment_power;
		}
	      h->root.non_ir_ref_dynamic = non_ir_ref_dynamic;
	    }
	}

      /* Make a special call to the linker "notice" function to
	 tell it that symbols added for crefs may need to be removed.  */
      if (!(*bed->notice_as_needed) (abfd, info, notice_not_needed))
	goto error_free_vers;

      free (old_tab);
      objalloc_free_block ((struct objalloc *) htab->root.table.memory,
			   alloc_mark);
      if (nondeflt_vers != NULL)
	free (nondeflt_vers);
      return TRUE;
    }

  if (old_tab != NULL)
    {
      if (!(*bed->notice_as_needed) (abfd, info, notice_needed))
	goto error_free_vers;
      free (old_tab);
      old_tab = NULL;
    }

  /* Now that all the symbols from this input file are created, if
     not performing a relocatable link, handle .symver foo, foo@BAR
     such that any relocs against foo become foo@BAR.  */
  if (!bfd_link_relocatable (info) && nondeflt_vers != NULL)
    {
      size_t cnt, symidx;

      for (cnt = 0; cnt < nondeflt_vers_cnt; ++cnt)
	{
	  struct elf_link_hash_entry *h = nondeflt_vers[cnt], *hi;
	  char *shortname, *p;

	  p = strchr (h->root.root.string, ELF_VER_CHR);
	  if (p == NULL
	      || (h->root.type != bfd_link_hash_defined
		  && h->root.type != bfd_link_hash_defweak))
	    continue;

	  amt = p - h->root.root.string;
	  shortname = (char *) bfd_malloc (amt + 1);
	  if (!shortname)
	    goto error_free_vers;
	  memcpy (shortname, h->root.root.string, amt);
	  shortname[amt] = '\0';

	  hi = (struct elf_link_hash_entry *)
	       bfd_link_hash_lookup (&htab->root, shortname,
				     FALSE, FALSE, FALSE);
	  if (hi != NULL
	      && hi->root.type == h->root.type
	      && hi->root.u.def.value == h->root.u.def.value
	      && hi->root.u.def.section == h->root.u.def.section)
	    {
	      (*bed->elf_backend_hide_symbol) (info, hi, TRUE);
	      hi->root.type = bfd_link_hash_indirect;
	      hi->root.u.i.link = (struct bfd_link_hash_entry *) h;
	      (*bed->elf_backend_copy_indirect_symbol) (info, h, hi);
	      sym_hash = elf_sym_hashes (abfd);
	      if (sym_hash)
		for (symidx = 0; symidx < extsymcount; ++symidx)
		  if (sym_hash[symidx] == hi)
		    {
		      sym_hash[symidx] = h;
		      break;
		    }
	    }
	  free (shortname);
	}
      free (nondeflt_vers);
      nondeflt_vers = NULL;
    }

  /* Now set the alias field correctly for all the weak defined
     symbols we found.  The only way to do this is to search all the
     symbols.  Since we only need the information for non functions in
     dynamic objects, that's the only time we actually put anything on
     the list WEAKS.  We need this information so that if a regular
     object refers to a symbol defined weakly in a dynamic object, the
     real symbol in the dynamic object is also put in the dynamic
     symbols; we also must arrange for both symbols to point to the
     same memory location.  We could handle the general case of symbol
     aliasing, but a general symbol alias can only be generated in
     assembler code, handling it correctly would be very time
     consuming, and other ELF linkers don't handle general aliasing
     either.  */
  if (weaks != NULL)
    {
      struct elf_link_hash_entry **hpp;
      struct elf_link_hash_entry **hppend;
      struct elf_link_hash_entry **sorted_sym_hash;
      struct elf_link_hash_entry *h;
      size_t sym_count;

      /* Since we have to search the whole symbol list for each weak
	 defined symbol, search time for N weak defined symbols will be
	 O(N^2). Binary search will cut it down to O(NlogN).  */
      amt = extsymcount;
      amt *= sizeof (struct elf_link_hash_entry *);
      sorted_sym_hash = (struct elf_link_hash_entry **) bfd_malloc (amt);
      if (sorted_sym_hash == NULL)
	goto error_return;
      sym_hash = sorted_sym_hash;
      hpp = elf_sym_hashes (abfd);
      hppend = hpp + extsymcount;
      sym_count = 0;
      for (; hpp < hppend; hpp++)
	{
	  h = *hpp;
	  if (h != NULL
	      && h->root.type == bfd_link_hash_defined
	      && !bed->is_function_type (h->type))
	    {
	      *sym_hash = h;
	      sym_hash++;
	      sym_count++;
	    }
	}

      qsort (sorted_sym_hash, sym_count,
	     sizeof (struct elf_link_hash_entry *),
	     elf_sort_symbol);

      while (weaks != NULL)
	{
	  struct elf_link_hash_entry *hlook;
	  asection *slook;
	  bfd_vma vlook;
	  size_t i, j, idx = 0;

	  hlook = weaks;
	  weaks = hlook->u.alias;
	  hlook->u.alias = NULL;

	  if (hlook->root.type != bfd_link_hash_defined
	      && hlook->root.type != bfd_link_hash_defweak)
	    continue;

	  slook = hlook->root.u.def.section;
	  vlook = hlook->root.u.def.value;

	  i = 0;
	  j = sym_count;
	  while (i != j)
	    {
	      bfd_signed_vma vdiff;
	      idx = (i + j) / 2;
	      h = sorted_sym_hash[idx];
	      vdiff = vlook - h->root.u.def.value;
	      if (vdiff < 0)
		j = idx;
	      else if (vdiff > 0)
		i = idx + 1;
	      else
		{
		  int sdiff = slook->id - h->root.u.def.section->id;
		  if (sdiff < 0)
		    j = idx;
		  else if (sdiff > 0)
		    i = idx + 1;
		  else
		    break;
		}
	    }

	  /* We didn't find a value/section match.  */
	  if (i == j)
	    continue;

	  /* With multiple aliases, or when the weak symbol is already
	     strongly defined, we have multiple matching symbols and
	     the binary search above may land on any of them.  Step
	     one past the matching symbol(s).  */
	  while (++idx != j)
	    {
	      h = sorted_sym_hash[idx];
	      if (h->root.u.def.section != slook
		  || h->root.u.def.value != vlook)
		break;
	    }

	  /* Now look back over the aliases.  Since we sorted by size
	     as well as value and section, we'll choose the one with
	     the largest size.  */
	  while (idx-- != i)
	    {
	      h = sorted_sym_hash[idx];

	      /* Stop if value or section doesn't match.  */
	      if (h->root.u.def.section != slook
		  || h->root.u.def.value != vlook)
		break;
	      else if (h != hlook)
		{
		  struct elf_link_hash_entry *t;

		  hlook->u.alias = h;
		  hlook->is_weakalias = 1;
		  t = h;
		  if (t->u.alias != NULL)
		    while (t->u.alias != h)
		      t = t->u.alias;
		  t->u.alias = hlook;

		  /* If the weak definition is in the list of dynamic
		     symbols, make sure the real definition is put
		     there as well.  */
		  if (hlook->dynindx != -1 && h->dynindx == -1)
		    {
		      if (! bfd_elf_link_record_dynamic_symbol (info, h))
			{
			err_free_sym_hash:
			  free (sorted_sym_hash);
			  goto error_return;
			}
		    }

		  /* If the real definition is in the list of dynamic
		     symbols, make sure the weak definition is put
		     there as well.  If we don't do this, then the
		     dynamic loader might not merge the entries for the
		     real definition and the weak definition.  */
		  if (h->dynindx != -1 && hlook->dynindx == -1)
		    {
		      if (! bfd_elf_link_record_dynamic_symbol (info, hlook))
			goto err_free_sym_hash;
		    }
		  break;
		}
	    }
	}

      free (sorted_sym_hash);
    }

  if (bed->check_directives
      && !(*bed->check_directives) (abfd, info))
    return FALSE;

  /* If this is a non-traditional link, try to optimize the handling
     of the .stab/.stabstr sections.  */
  if (! dynamic
      && ! info->traditional_format
      && is_elf_hash_table (htab)
      && (info->strip != strip_all && info->strip != strip_debugger))
    {
      asection *stabstr;

      stabstr = bfd_get_section_by_name (abfd, ".stabstr");
      if (stabstr != NULL)
	{
	  bfd_size_type string_offset = 0;
	  asection *stab;

	  for (stab = abfd->sections; stab; stab = stab->next)
	    if (CONST_STRNEQ (stab->name, ".stab")
		&& (!stab->name[5] ||
		    (stab->name[5] == '.' && ISDIGIT (stab->name[6])))
		&& (stab->flags & SEC_MERGE) == 0
		&& !bfd_is_abs_section (stab->output_section))
	      {
		struct bfd_elf_section_data *secdata;

		secdata = elf_section_data (stab);
		if (! _bfd_link_section_stabs (abfd, &htab->stab_info, stab,
					       stabstr, &secdata->sec_info,
					       &string_offset))
		  goto error_return;
		if (secdata->sec_info)
		  stab->sec_info_type = SEC_INFO_TYPE_STABS;
	    }
	}
    }

  if (is_elf_hash_table (htab) && add_needed)
    {
      /* Add this bfd to the loaded list.  */
      struct elf_link_loaded_list *n;

      n = (struct elf_link_loaded_list *) bfd_alloc (abfd, sizeof (*n));
      if (n == NULL)
	goto error_return;
      n->abfd = abfd;
      n->next = htab->loaded;
      htab->loaded = n;
    }

  return TRUE;

 error_free_vers:
  if (old_tab != NULL)
    free (old_tab);
  if (old_strtab != NULL)
    free (old_strtab);
  if (nondeflt_vers != NULL)
    free (nondeflt_vers);
  if (extversym != NULL)
    free (extversym);
 error_free_sym:
  if (isymbuf != NULL)
    free (isymbuf);
 error_return:
  return FALSE;
}

/* Return the linker hash table entry of a symbol that might be
   satisfied by an archive symbol.  Return -1 on error.  */

struct elf_link_hash_entry *
_bfd_elf_archive_symbol_lookup (bfd *abfd,
				struct bfd_link_info *info,
				const char *name)
{
  struct elf_link_hash_entry *h;
  char *p, *copy;
  size_t len, first;

  h = elf_link_hash_lookup (elf_hash_table (info), name, FALSE, FALSE, TRUE);
  if (h != NULL)
    return h;

  /* If this is a default version (the name contains @@), look up the
     symbol again with only one `@' as well as without the version.
     The effect is that references to the symbol with and without the