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[binutils-gdb.git] / bfd / cofflink.c

/* COFF specific linker code.
   Copyright (C) 1994-2021 Free Software Foundation, Inc.
   Written by Ian Lance Taylor, Cygnus Support.

   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.  */

/* This file contains the COFF backend linker code.  */

#include "sysdep.h"
#include "bfd.h"
#include "bfdlink.h"
#include "libbfd.h"
#include "coff/internal.h"
#include "libcoff.h"
#include "safe-ctype.h"

static bool coff_link_add_object_symbols (bfd *, struct bfd_link_info *);
static bool coff_link_check_archive_element
  (bfd *, struct bfd_link_info *, struct bfd_link_hash_entry *, const char *,
   bool *);
static bool coff_link_add_symbols (bfd *, struct bfd_link_info *);

/* Return TRUE if SYM is a weak, external symbol.  */
#define IS_WEAK_EXTERNAL(abfd, sym)                     \
  ((sym).n_sclass == C_WEAKEXT                          \
   || (obj_pe (abfd) && (sym).n_sclass == C_NT_WEAK))

/* Return TRUE if SYM is an external symbol.  */
#define IS_EXTERNAL(abfd, sym)                          \
  ((sym).n_sclass == C_EXT || IS_WEAK_EXTERNAL (abfd, sym))

/* Define macros so that the ISFCN, et. al., macros work correctly.
   These macros are defined in include/coff/internal.h in terms of
   N_TMASK, etc.  These definitions require a user to define local
   variables with the appropriate names, and with values from the
   coff_data (abfd) structure.  */

#define N_TMASK n_tmask
#define N_BTSHFT n_btshft
#define N_BTMASK n_btmask

/* Create an entry in a COFF linker hash table.  */

struct bfd_hash_entry *
_bfd_coff_link_hash_newfunc (struct bfd_hash_entry *entry,
                             struct bfd_hash_table *table,
                             const char *string)
{
  struct coff_link_hash_entry *ret = (struct coff_link_hash_entry *) entry;

  /* Allocate the structure if it has not already been allocated by a
     subclass.  */
  if (ret == (struct coff_link_hash_entry *) NULL)
    ret = ((struct coff_link_hash_entry *)
           bfd_hash_allocate (table, sizeof (struct coff_link_hash_entry)));
  if (ret == (struct coff_link_hash_entry *) NULL)
    return (struct bfd_hash_entry *) ret;

  /* Call the allocation method of the superclass.  */
  ret = ((struct coff_link_hash_entry *)
         _bfd_link_hash_newfunc ((struct bfd_hash_entry *) ret,
                                 table, string));
  if (ret != (struct coff_link_hash_entry *) NULL)
    {
      /* Set local fields.  */
      ret->indx = -1;
      ret->type = T_NULL;
      ret->symbol_class = C_NULL;
      ret->numaux = 0;
      ret->auxbfd = NULL;
      ret->aux = NULL;
    }

  return (struct bfd_hash_entry *) ret;
}

/* Initialize a COFF linker hash table.  */

bool
_bfd_coff_link_hash_table_init (struct coff_link_hash_table *table,
                                bfd *abfd,
                                struct bfd_hash_entry *(*newfunc) (struct bfd_hash_entry *,
                                                                   struct bfd_hash_table *,
                                                                   const char *),
                                unsigned int entsize)
{
  memset (&table->stab_info, 0, sizeof (table->stab_info));
  return _bfd_link_hash_table_init (&table->root, abfd, newfunc, entsize);
}

/* Create a COFF linker hash table.  */

struct bfd_link_hash_table *
_bfd_coff_link_hash_table_create (bfd *abfd)
{
  struct coff_link_hash_table *ret;
  size_t amt = sizeof (struct coff_link_hash_table);

  ret = (struct coff_link_hash_table *) bfd_malloc (amt);
  if (ret == NULL)
    return NULL;

  if (! _bfd_coff_link_hash_table_init (ret, abfd,
                                        _bfd_coff_link_hash_newfunc,
                                        sizeof (struct coff_link_hash_entry)))
    {
      free (ret);
      return (struct bfd_link_hash_table *) NULL;
    }
  return &ret->root;
}

/* Create an entry in a COFF debug merge hash table.  */

struct bfd_hash_entry *
_bfd_coff_debug_merge_hash_newfunc (struct bfd_hash_entry *entry,
                                    struct bfd_hash_table *table,
                                    const char *string)
{
  struct coff_debug_merge_hash_entry *ret =
    (struct coff_debug_merge_hash_entry *) entry;

  /* Allocate the structure if it has not already been allocated by a
     subclass.  */
  if (ret == (struct coff_debug_merge_hash_entry *) NULL)
    ret = ((struct coff_debug_merge_hash_entry *)
           bfd_hash_allocate (table,
                              sizeof (struct coff_debug_merge_hash_entry)));
  if (ret == (struct coff_debug_merge_hash_entry *) NULL)
    return (struct bfd_hash_entry *) ret;

  /* Call the allocation method of the superclass.  */
  ret = ((struct coff_debug_merge_hash_entry *)
         bfd_hash_newfunc ((struct bfd_hash_entry *) ret, table, string));
  if (ret != (struct coff_debug_merge_hash_entry *) NULL)
    {
      /* Set local fields.  */
      ret->types = NULL;
    }

  return (struct bfd_hash_entry *) ret;
}

/* Given a COFF BFD, add symbols to the global hash table as
   appropriate.  */

bool
_bfd_coff_link_add_symbols (bfd *abfd, struct bfd_link_info *info)
{
  switch (bfd_get_format (abfd))
    {
    case bfd_object:
      return coff_link_add_object_symbols (abfd, info);
    case bfd_archive:
      return _bfd_generic_link_add_archive_symbols
        (abfd, info, coff_link_check_archive_element);
    default:
      bfd_set_error (bfd_error_wrong_format);
      return false;
    }
}

/* Add symbols from a COFF object file.  */

static bool
coff_link_add_object_symbols (bfd *abfd, struct bfd_link_info *info)
{
  if (! _bfd_coff_get_external_symbols (abfd))
    return false;
  if (! coff_link_add_symbols (abfd, info))
    return false;

  if (! info->keep_memory
      && ! _bfd_coff_free_symbols (abfd))
    return false;

  return true;
}

/* Check a single archive element to see if we need to include it in
   the link.  *PNEEDED is set according to whether this element is
   needed in the link or not.  This is called via
   _bfd_generic_link_add_archive_symbols.  */

static bool
coff_link_check_archive_element (bfd *abfd,
                                 struct bfd_link_info *info,
                                 struct bfd_link_hash_entry *h,
                                 const char *name,
                                 bool *pneeded)
{
  *pneeded = false;

  /* PR 22369 - Skip non COFF objects in the archive.  */
  if (! bfd_family_coff (abfd))
    return true;

  /* We are only interested in symbols that are currently undefined.
     If a symbol is currently known to be common, COFF linkers do not
     bring in an object file which defines it.  */
  if (h->type != bfd_link_hash_undefined)
    return true;

  /* If the archive element has already been loaded then one
     of the symbols defined by that element might have been
     made undefined due to being in a discarded section.  */
  if (((struct coff_link_hash_entry *) h)->indx == -3)
    return true;

  /* Include this element?  */
  if (!(*info->callbacks->add_archive_element) (info, abfd, name, &abfd))
    return true;
  *pneeded = true;

  return bfd_link_add_symbols (abfd, info);
}

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

static bool
coff_link_add_symbols (bfd *abfd,
                       struct bfd_link_info *info)
{
  unsigned int n_tmask = coff_data (abfd)->local_n_tmask;
  unsigned int n_btshft = coff_data (abfd)->local_n_btshft;
  unsigned int n_btmask = coff_data (abfd)->local_n_btmask;
  bool keep_syms;
  bool default_copy;
  bfd_size_type symcount;
  struct coff_link_hash_entry **sym_hash;
  bfd_size_type symesz;
  bfd_byte *esym;
  bfd_byte *esym_end;
  bfd_size_type amt;

  symcount = obj_raw_syment_count (abfd);

  if (symcount == 0)
    return true;                /* Nothing to do.  */

  /* Keep the symbols during this function, in case the linker needs
     to read the generic symbols in order to report an error message.  */
  keep_syms = obj_coff_keep_syms (abfd);
  obj_coff_keep_syms (abfd) = true;

  if (info->keep_memory)
    default_copy = false;
  else
    default_copy = true;

  /* We keep a list of the linker hash table entries that correspond
     to particular symbols.  */
  amt = symcount * sizeof (struct coff_link_hash_entry *);
  sym_hash = (struct coff_link_hash_entry **) bfd_zalloc (abfd, amt);
  if (sym_hash == NULL)
    goto error_return;
  obj_coff_sym_hashes (abfd) = sym_hash;

  symesz = bfd_coff_symesz (abfd);
  BFD_ASSERT (symesz == bfd_coff_auxesz (abfd));
  esym = (bfd_byte *) obj_coff_external_syms (abfd);
  esym_end = esym + symcount * symesz;
  while (esym < esym_end)
    {
      struct internal_syment sym;
      enum coff_symbol_classification classification;
      bool copy;

      bfd_coff_swap_sym_in (abfd, esym, &sym);

      classification = bfd_coff_classify_symbol (abfd, &sym);
      if (classification != COFF_SYMBOL_LOCAL)
        {
          const char *name;
          char buf[SYMNMLEN + 1];
          flagword flags;
          asection *section;
          bfd_vma value;
          bool addit;
          bool discarded = false;

          /* This symbol is externally visible.  */

          name = _bfd_coff_internal_syment_name (abfd, &sym, buf);
          if (name == NULL)
            goto error_return;

          /* We must copy the name into memory if we got it from the
             syment itself, rather than the string table.  */
          copy = default_copy;
          if (sym._n._n_n._n_zeroes != 0
              || sym._n._n_n._n_offset == 0)
            copy = true;

          value = sym.n_value;

          switch (classification)
            {
            default:
              abort ();

            case COFF_SYMBOL_GLOBAL:
              flags = BSF_EXPORT | BSF_GLOBAL;
              section = coff_section_from_bfd_index (abfd, sym.n_scnum);
              if (discarded_section (section))
                {
                  discarded = true;
                  section = bfd_und_section_ptr;
                }
              else if (! obj_pe (abfd))
                value -= section->vma;
              break;

            case COFF_SYMBOL_UNDEFINED:
              flags = 0;
              section = bfd_und_section_ptr;
              break;

            case COFF_SYMBOL_COMMON:
              flags = BSF_GLOBAL;
              section = bfd_com_section_ptr;
              break;

            case COFF_SYMBOL_PE_SECTION:
              flags = BSF_SECTION_SYM | BSF_GLOBAL;
              section = coff_section_from_bfd_index (abfd, sym.n_scnum);
              if (discarded_section (section))
                section = bfd_und_section_ptr;
              break;
            }

          if (IS_WEAK_EXTERNAL (abfd, sym))
            flags = BSF_WEAK;

          addit = true;

          /* In the PE format, section symbols actually refer to the
             start of the output section.  We handle them specially
             here.  */
          if (obj_pe (abfd) && (flags & BSF_SECTION_SYM) != 0)
            {
              *sym_hash = coff_link_hash_lookup (coff_hash_table (info),
                                                 name, false, copy, false);
              if (*sym_hash != NULL)
                {
                  if (((*sym_hash)->coff_link_hash_flags
                       & COFF_LINK_HASH_PE_SECTION_SYMBOL) == 0
                      && (*sym_hash)->root.type != bfd_link_hash_undefined
                      && (*sym_hash)->root.type != bfd_link_hash_undefweak)
                    _bfd_error_handler
                      (_("warning: symbol `%s' is both section and non-section"),
                       name);

                  addit = false;
                }
            }

          /* The Microsoft Visual C compiler does string pooling by
             hashing the constants to an internal symbol name, and
             relying on the linker comdat support to discard
             duplicate names.  However, if one string is a literal and
             one is a data initializer, one will end up in the .data
             section and one will end up in the .rdata section.  The
             Microsoft linker will combine them into the .data
             section, which seems to be wrong since it might cause the
             literal to change.

             As long as there are no external references to the
             symbols, which there shouldn't be, we can treat the .data
             and .rdata instances as separate symbols.  The comdat
             code in the linker will do the appropriate merging.  Here
             we avoid getting a multiple definition error for one of
             these special symbols.

             FIXME: I don't think this will work in the case where
             there are two object files which use the constants as a
             literal and two object files which use it as a data
             initializer.  One or the other of the second object files
             is going to wind up with an inappropriate reference.  */
          if (obj_pe (abfd)
              && (classification == COFF_SYMBOL_GLOBAL
                  || classification == COFF_SYMBOL_PE_SECTION)
              && coff_section_data (abfd, section) != NULL
              && coff_section_data (abfd, section)->comdat != NULL
              && startswith (name, "??_")
              && strcmp (name, coff_section_data (abfd, section)->comdat->name) == 0)
            {
              if (*sym_hash == NULL)
                *sym_hash = coff_link_hash_lookup (coff_hash_table (info),
                                                   name, false, copy, false);
              if (*sym_hash != NULL
                  && (*sym_hash)->root.type == bfd_link_hash_defined
                  && coff_section_data (abfd, (*sym_hash)->root.u.def.section)->comdat != NULL
                  && strcmp (coff_section_data (abfd, (*sym_hash)->root.u.def.section)->comdat->name,
                             coff_section_data (abfd, section)->comdat->name) == 0)
                addit = false;
            }

          if (addit)
            {
              if (! (bfd_coff_link_add_one_symbol
                     (info, abfd, name, flags, section, value,
                      (const char *) NULL, copy, false,
                      (struct bfd_link_hash_entry **) sym_hash)))
                goto error_return;

              if (discarded)
                (*sym_hash)->indx = -3;
            }

          if (obj_pe (abfd) && (flags & BSF_SECTION_SYM) != 0)
            (*sym_hash)->coff_link_hash_flags |=
              COFF_LINK_HASH_PE_SECTION_SYMBOL;

          /* Limit the alignment of a common symbol to the possible
             alignment of a section.  There is no point to permitting
             a higher alignment for a common symbol: we can not
             guarantee it, and it may cause us to allocate extra space
             in the common section.  */
          if (section == bfd_com_section_ptr
              && (*sym_hash)->root.type == bfd_link_hash_common
              && ((*sym_hash)->root.u.c.p->alignment_power
                  > bfd_coff_default_section_alignment_power (abfd)))
            (*sym_hash)->root.u.c.p->alignment_power
              = bfd_coff_default_section_alignment_power (abfd);

          if (bfd_get_flavour (info->output_bfd) == bfd_get_flavour (abfd))
            {
              /* If we don't have any symbol information currently in
                 the hash table, or if we are looking at a symbol
                 definition, then update the symbol class and type in
                 the hash table.  */
              if (((*sym_hash)->symbol_class == C_NULL
                   && (*sym_hash)->type == T_NULL)
                  || sym.n_scnum != 0
                  || (sym.n_value != 0
                      && (*sym_hash)->root.type != bfd_link_hash_defined
                      && (*sym_hash)->root.type != bfd_link_hash_defweak))
                {
                  (*sym_hash)->symbol_class = sym.n_sclass;
                  if (sym.n_type != T_NULL)
                    {
                      /* We want to warn if the type changed, but not
                         if it changed from an unspecified type.
                         Testing the whole type byte may work, but the
                         change from (e.g.) a function of unspecified
                         type to function of known type also wants to
                         skip the warning.  */
                      if ((*sym_hash)->type != T_NULL
                          && (*sym_hash)->type != sym.n_type
                          && !(DTYPE ((*sym_hash)->type) == DTYPE (sym.n_type)
                               && (BTYPE ((*sym_hash)->type) == T_NULL
                                   || BTYPE (sym.n_type) == T_NULL)))
                        _bfd_error_handler
                          /* xgettext: c-format */
                          (_("warning: type of symbol `%s' changed"
                             " from %d to %d in %pB"),
                           name, (*sym_hash)->type, sym.n_type, abfd);

                      /* We don't want to change from a meaningful
                         base type to a null one, but if we know
                         nothing, take what little we might now know.  */
                      if (BTYPE (sym.n_type) != T_NULL
                          || (*sym_hash)->type == T_NULL)
                        (*sym_hash)->type = sym.n_type;
                    }
                  (*sym_hash)->auxbfd = abfd;
                  if (sym.n_numaux != 0)
                    {
                      union internal_auxent *alloc;
                      unsigned int i;
                      bfd_byte *eaux;
                      union internal_auxent *iaux;

                      (*sym_hash)->numaux = sym.n_numaux;
                      alloc = ((union internal_auxent *)
                               bfd_hash_allocate (&info->hash->table,
                                                  (sym.n_numaux
                                                   * sizeof (*alloc))));
                      if (alloc == NULL)
                        goto error_return;
                      for (i = 0, eaux = esym + symesz, iaux = alloc;
                           i < sym.n_numaux;
                           i++, eaux += symesz, iaux++)
                        bfd_coff_swap_aux_in (abfd, eaux, sym.n_type,
                                              sym.n_sclass, (int) i,
                                              sym.n_numaux, iaux);
                      (*sym_hash)->aux = alloc;
                    }
                }
            }

          if (classification == COFF_SYMBOL_PE_SECTION
              && (*sym_hash)->numaux != 0)
            {
              /* Some PE sections (such as .bss) have a zero size in
                 the section header, but a non-zero size in the AUX
                 record.  Correct that here.

                 FIXME: This is not at all the right place to do this.
                 For example, it won't help objdump.  This needs to be
                 done when we swap in the section header.  */
              BFD_ASSERT ((*sym_hash)->numaux == 1);
              if (section->size == 0)
                section->size = (*sym_hash)->aux[0].x_scn.x_scnlen;

              /* FIXME: We could test whether the section sizes
                 matches the size in the aux entry, but apparently
                 that sometimes fails unexpectedly.  */
            }
        }

      esym += (sym.n_numaux + 1) * symesz;
      sym_hash += sym.n_numaux + 1;
    }

  /* If this is a non-traditional, non-relocatable link, try to
     optimize the handling of any .stab/.stabstr sections.  */
  if (! bfd_link_relocatable (info)
      && ! info->traditional_format
      && bfd_get_flavour (info->output_bfd) == bfd_get_flavour (abfd)
      && (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 (startswith (stab->name, ".stab")
                && (!stab->name[5]
                    || (stab->name[5] == '.' && ISDIGIT (stab->name[6]))))
            {
              struct coff_link_hash_table *table;
              struct coff_section_tdata *secdata
                = coff_section_data (abfd, stab);

              if (secdata == NULL)
                {
                  amt = sizeof (struct coff_section_tdata);
                  stab->used_by_bfd = bfd_zalloc (abfd, amt);
                  if (stab->used_by_bfd == NULL)
                    goto error_return;
                  secdata = coff_section_data (abfd, stab);
                }

              table = coff_hash_table (info);

              if (! _bfd_link_section_stabs (abfd, &table->stab_info,
                                             stab, stabstr,
                                             &secdata->stab_info,
                                             &string_offset))
                goto error_return;
            }
        }
    }

  obj_coff_keep_syms (abfd) = keep_syms;

  return true;

 error_return:
  obj_coff_keep_syms (abfd) = keep_syms;
  return false;
}
\f
/* Do the final link step.  */

bool
_bfd_coff_final_link (bfd *abfd,
                      struct bfd_link_info *info)
{
  bfd_size_type symesz;
  struct coff_final_link_info flaginfo;
  bool debug_merge_allocated;
  bool long_section_names;
  asection *o;
  struct bfd_link_order *p;
  bfd_size_type max_sym_count;
  bfd_size_type max_lineno_count;
  bfd_size_type max_reloc_count;
  bfd_size_type max_output_reloc_count;
  bfd_size_type max_contents_size;
  file_ptr rel_filepos;
  unsigned int relsz;
  file_ptr line_filepos;
  unsigned int linesz;
  bfd *sub;
  bfd_byte *external_relocs = NULL;
  char strbuf[STRING_SIZE_SIZE];
  bfd_size_type amt;

  symesz = bfd_coff_symesz (abfd);

  flaginfo.info = info;
  flaginfo.output_bfd = abfd;
  flaginfo.strtab = NULL;
  flaginfo.section_info = NULL;
  flaginfo.last_file_index = -1;
  flaginfo.last_bf_index = -1;
  flaginfo.internal_syms = NULL;
  flaginfo.sec_ptrs = NULL;
  flaginfo.sym_indices = NULL;
  flaginfo.outsyms = NULL;
  flaginfo.linenos = NULL;
  flaginfo.contents = NULL;
  flaginfo.external_relocs = NULL;
  flaginfo.internal_relocs = NULL;
  flaginfo.global_to_static = false;
  debug_merge_allocated = false;

  coff_data (abfd)->link_info = info;

  flaginfo.strtab = _bfd_stringtab_init ();
  if (flaginfo.strtab == NULL)
    goto error_return;

  if (! coff_debug_merge_hash_table_init (&flaginfo.debug_merge))
    goto error_return;
  debug_merge_allocated = true;

  /* Compute the file positions for all the sections.  */
  if (! abfd->output_has_begun)
    {
      if (! bfd_coff_compute_section_file_positions (abfd))
        goto error_return;
    }

  /* Count the line numbers and relocation entries required for the
     output file.  Set the file positions for the relocs.  */
  rel_filepos = obj_relocbase (abfd);
  relsz = bfd_coff_relsz (abfd);
  max_contents_size = 0;
  max_lineno_count = 0;
  max_reloc_count = 0;

  long_section_names = false;
  for (o = abfd->sections; o != NULL; o = o->next)
    {
      o->reloc_count = 0;
      o->lineno_count = 0;
      for (p = o->map_head.link_order; p != NULL; p = p->next)
        {
          if (p->type == bfd_indirect_link_order)
            {
              asection *sec;

              sec = p->u.indirect.section;

              /* Mark all sections which are to be included in the
                 link.  This will normally be every section.  We need
                 to do this so that we can identify any sections which
                 the linker has decided to not include.  */
              sec->linker_mark = true;

              if (info->strip == strip_none
                  || info->strip == strip_some)
                o->lineno_count += sec->lineno_count;

              if (bfd_link_relocatable (info))
                o->reloc_count += sec->reloc_count;

              if (sec->rawsize > max_contents_size)
                max_contents_size = sec->rawsize;
              if (sec->size > max_contents_size)
                max_contents_size = sec->size;
              if (sec->lineno_count > max_lineno_count)
                max_lineno_count = sec->lineno_count;
              if (sec->reloc_count > max_reloc_count)
                max_reloc_count = sec->reloc_count;
            }
          else if (bfd_link_relocatable (info)
                   && (p->type == bfd_section_reloc_link_order
                       || p->type == bfd_symbol_reloc_link_order))
            ++o->reloc_count;
        }
      if (o->reloc_count == 0)
        o->rel_filepos = 0;
      else
        {
          o->flags |= SEC_RELOC;
          o->rel_filepos = rel_filepos;
          rel_filepos += o->reloc_count * relsz;
          /* In PE COFF, if there are at least 0xffff relocations an
             extra relocation will be written out to encode the count.  */
          if ((obj_pe (abfd) || obj_go32 (abfd)) && o->reloc_count >= 0xffff)
            rel_filepos += relsz;
        }

      if (bfd_coff_long_section_names (abfd)
          && strlen (o->name) > SCNNMLEN)
        {
          /* This section has a long name which must go in the string
             table.  This must correspond to the code in
             coff_write_object_contents which puts the string index
             into the s_name field of the section header.  That is why
             we pass hash as FALSE.  */
          if (_bfd_stringtab_add (flaginfo.strtab, o->name, false, false)
              == (bfd_size_type) -1)
            goto error_return;
          long_section_names = true;
        }
    }

  /* If doing a relocatable link, allocate space for the pointers we
     need to keep.  */
  if (bfd_link_relocatable (info))
    {
      unsigned int i;

      /* We use section_count + 1, rather than section_count, because
         the target_index fields are 1 based.  */
      amt = abfd->section_count + 1;
      amt *= sizeof (struct coff_link_section_info);
      flaginfo.section_info = (struct coff_link_section_info *) bfd_malloc (amt);
      if (flaginfo.section_info == NULL)
        goto error_return;
      for (i = 0; i <= abfd->section_count; i++)
        {
          flaginfo.section_info[i].relocs = NULL;
          flaginfo.section_info[i].rel_hashes = NULL;
        }
    }

  /* We now know the size of the relocs, so we can determine the file
     positions of the line numbers.  */
  line_filepos = rel_filepos;
  linesz = bfd_coff_linesz (abfd);
  max_output_reloc_count = 0;
  for (o = abfd->sections; o != NULL; o = o->next)
    {
      if (o->lineno_count == 0)
        o->line_filepos = 0;
      else
        {
          o->line_filepos = line_filepos;
          line_filepos += o->lineno_count * linesz;
        }

      if (o->reloc_count != 0)
        {
          /* We don't know the indices of global symbols until we have
             written out all the local symbols.  For each section in
             the output file, we keep an array of pointers to hash
             table entries.  Each entry in the array corresponds to a
             reloc.  When we find a reloc against a global symbol, we
             set the corresponding entry in this array so that we can
             fix up the symbol index after we have written out all the
             local symbols.

             Because of this problem, we also keep the relocs in
             memory until the end of the link.  This wastes memory,
             but only when doing a relocatable link, which is not the
             common case.  */
          BFD_ASSERT (bfd_link_relocatable (info));
          amt = o->reloc_count;
          amt *= sizeof (struct internal_reloc);
          flaginfo.section_info[o->target_index].relocs =
              (struct internal_reloc *) bfd_malloc (amt);
          amt = o->reloc_count;
          amt *= sizeof (struct coff_link_hash_entry *);
          flaginfo.section_info[o->target_index].rel_hashes =
              (struct coff_link_hash_entry **) bfd_malloc (amt);
          if (flaginfo.section_info[o->target_index].relocs == NULL
              || flaginfo.section_info[o->target_index].rel_hashes == NULL)
            goto error_return;

          if (o->reloc_count > max_output_reloc_count)
            max_output_reloc_count = o->reloc_count;
        }

      /* Reset the reloc and lineno counts, so that we can use them to
         count the number of entries we have output so far.  */
      o->reloc_count = 0;
      o->lineno_count = 0;
    }

  obj_sym_filepos (abfd) = line_filepos;

  /* Figure out the largest number of symbols in an input BFD.  Take
     the opportunity to clear the output_has_begun fields of all the
     input BFD's.  */
  max_sym_count = 0;
  for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
    {
      size_t sz;

      sub->output_has_begun = false;
      sz = bfd_family_coff (sub) ? obj_raw_syment_count (sub) : 2;
      if (sz > max_sym_count)
        max_sym_count = sz;
    }

  /* Allocate some buffers used while linking.  */
  amt = max_sym_count * sizeof (struct internal_syment);
  flaginfo.internal_syms = (struct internal_syment *) bfd_malloc (amt);
  amt = max_sym_count * sizeof (asection *);
  flaginfo.sec_ptrs = (asection **) bfd_malloc (amt);
  amt = max_sym_count * sizeof (long);
  flaginfo.sym_indices = (long int *) bfd_malloc (amt);
  flaginfo.outsyms = (bfd_byte *) bfd_malloc ((max_sym_count + 1) * symesz);
  amt = max_lineno_count * bfd_coff_linesz (abfd);
  flaginfo.linenos = (bfd_byte *) bfd_malloc (amt);
  flaginfo.contents = (bfd_byte *) bfd_malloc (max_contents_size);
  amt = max_reloc_count * relsz;
  flaginfo.external_relocs = (bfd_byte *) bfd_malloc (amt);
  if (! bfd_link_relocatable (info))
    {
      amt = max_reloc_count * sizeof (struct internal_reloc);
      flaginfo.internal_relocs = (struct internal_reloc *) bfd_malloc (amt);
    }
  if ((flaginfo.internal_syms == NULL && max_sym_count > 0)
      || (flaginfo.sec_ptrs == NULL && max_sym_count > 0)
      || (flaginfo.sym_indices == NULL && max_sym_count > 0)
      || flaginfo.outsyms == NULL
      || (flaginfo.linenos == NULL && max_lineno_count > 0)
      || (flaginfo.contents == NULL && max_contents_size > 0)
      || (flaginfo.external_relocs == NULL && max_reloc_count > 0)
      || (! bfd_link_relocatable (info)
          && flaginfo.internal_relocs == NULL
          && max_reloc_count > 0))
    goto error_return;

  /* We now know the position of everything in the file, except that
     we don't know the size of the symbol table and therefore we don't
     know where the string table starts.  We just build the string
     table in memory as we go along.  We process all the relocations
     for a single input file at once.  */
  obj_raw_syment_count (abfd) = 0;

  if (coff_backend_info (abfd)->_bfd_coff_start_final_link)
    {
      if (! bfd_coff_start_final_link (abfd, info))
        goto error_return;
    }

  for (o = abfd->sections; o != NULL; o = o->next)
    {
      for (p = o->map_head.link_order; p != NULL; p = p->next)
        {
          if (p->type == bfd_indirect_link_order
              && bfd_family_coff (p->u.indirect.section->owner))
            {
              sub = p->u.indirect.section->owner;
              if (! bfd_coff_link_output_has_begun (sub, & flaginfo))
                {
                  if (! _bfd_coff_link_input_bfd (&flaginfo, sub))
                    goto error_return;
                  sub->output_has_begun = true;
                }
            }
          else if (p->type == bfd_section_reloc_link_order
                   || p->type == bfd_symbol_reloc_link_order)
            {
              if (! _bfd_coff_reloc_link_order (abfd, &flaginfo, o, p))
                goto error_return;
            }
          else
            {
              if (! _bfd_default_link_order (abfd, info, o, p))
                goto error_return;
            }
        }
    }

  if (flaginfo.info->strip != strip_all && flaginfo.info->discard != discard_all)
    {
      /* Add local symbols from foreign inputs.  */
      for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
        {
          unsigned int i;

          if (bfd_family_coff (sub) || ! bfd_get_outsymbols (sub))
            continue;
          for (i = 0; i < bfd_get_symcount (sub); ++i)
            {
              asymbol *sym = bfd_get_outsymbols (sub) [i];
              file_ptr pos;
              struct internal_syment isym;
              union internal_auxent iaux;
              bfd_size_type string_size = 0, indx;
              bfd_vma written = 0;
              bool rewrite = false, hash;

              if (! (sym->flags & BSF_LOCAL)
                  || (sym->flags & (BSF_SECTION_SYM | BSF_DEBUGGING_RELOC
                                    | BSF_THREAD_LOCAL | BSF_RELC | BSF_SRELC
                                    | BSF_SYNTHETIC))
                  || ((sym->flags & BSF_DEBUGGING)
                      && ! (sym->flags & BSF_FILE)))
                continue;

              /* See if we are discarding symbols with this name.  */
              if ((flaginfo.info->strip == strip_some
                   && (bfd_hash_lookup (flaginfo.info->keep_hash,
                                        bfd_asymbol_name(sym), false, false)
                       == NULL))
                  || (((flaginfo.info->discard == discard_sec_merge
                        && (bfd_asymbol_section (sym)->flags & SEC_MERGE)
                        && ! bfd_link_relocatable (flaginfo.info))
                       || flaginfo.info->discard == discard_l)
                      && bfd_is_local_label_name (sub, bfd_asymbol_name(sym))))
                continue;

              pos = obj_sym_filepos (abfd) + obj_raw_syment_count (abfd)
                                             * symesz;
              if (bfd_seek (abfd, pos, SEEK_SET) != 0)
                goto error_return;
              if (! coff_write_alien_symbol(abfd, sym, &isym, &iaux, &written,
                                            &string_size, NULL, NULL))
                goto error_return;

              hash = !flaginfo.info->traditional_format;

              if (string_size >= 6 && isym.n_sclass == C_FILE
                  && ! isym._n._n_n._n_zeroes && isym.n_numaux)
                {
                  indx = _bfd_stringtab_add (flaginfo.strtab, ".file", hash,
                                             false);
                  if (indx == (bfd_size_type) -1)
                    goto error_return;
                  isym._n._n_n._n_offset = STRING_SIZE_SIZE + indx;
                  bfd_coff_swap_sym_out (abfd, &isym, flaginfo.outsyms);
                  if (bfd_seek (abfd, pos, SEEK_SET) != 0
                      || bfd_bwrite (flaginfo.outsyms, symesz,
                                     abfd) != symesz)
                    goto error_return;
                  string_size -= 6;
                }

              if (string_size)
                {
                  indx = _bfd_stringtab_add (flaginfo.strtab,
                                             bfd_asymbol_name (sym), hash,
                                             false);
                  if (indx == (bfd_size_type) -1)
                    goto error_return;
                  if (isym.n_sclass != C_FILE)
                    {
                      isym._n._n_n._n_offset = STRING_SIZE_SIZE + indx;
                      bfd_coff_swap_sym_out (abfd, &isym, flaginfo.outsyms);
                      rewrite = true;
                    }
                  else
                    {
                      BFD_ASSERT (isym.n_numaux == 1);
                      iaux.x_file.x_n.x_offset = STRING_SIZE_SIZE + indx;
                      bfd_coff_swap_aux_out (abfd, &iaux, isym.n_type, C_FILE,
                                             0, 1, flaginfo.outsyms + symesz);
                      if (bfd_seek (abfd, pos + symesz, SEEK_SET) != 0
                          || bfd_bwrite (flaginfo.outsyms + symesz, symesz,
                                         abfd) != symesz)
                        goto error_return;
                    }
                }

              if (isym.n_sclass == C_FILE)
                {
                  if (flaginfo.last_file_index != -1)
                    {
                      flaginfo.last_file.n_value = obj_raw_syment_count (abfd);
                      bfd_coff_swap_sym_out (abfd, &flaginfo.last_file,
                                             flaginfo.outsyms);
                      pos = obj_sym_filepos (abfd) + flaginfo.last_file_index
                                                     * symesz;
                      rewrite = true;
                    }
                  flaginfo.last_file_index = obj_raw_syment_count (abfd);
                  flaginfo.last_file = isym;
                }

              if (rewrite
                  && (bfd_seek (abfd, pos, SEEK_SET) != 0
                      || bfd_bwrite (flaginfo.outsyms, symesz, abfd) != symesz))
                goto error_return;

              obj_raw_syment_count (abfd) += written;
            }
        }
    }

  if (! bfd_coff_final_link_postscript (abfd, & flaginfo))
    goto error_return;

  /* Free up the buffers used by _bfd_coff_link_input_bfd.  */

  coff_debug_merge_hash_table_free (&flaginfo.debug_merge);
  debug_merge_allocated = false;

  free (flaginfo.internal_syms);
  flaginfo.internal_syms = NULL;
  free (flaginfo.sec_ptrs);
  flaginfo.sec_ptrs = NULL;
  free (flaginfo.sym_indices);
  flaginfo.sym_indices = NULL;
  free (flaginfo.linenos);
  flaginfo.linenos = NULL;
  free (flaginfo.contents);
  flaginfo.contents = NULL;
  free (flaginfo.external_relocs);
  flaginfo.external_relocs = NULL;
  free (flaginfo.internal_relocs);
  flaginfo.internal_relocs = NULL;

  /* The value of the last C_FILE symbol is supposed to be the symbol
     index of the first external symbol.  Write it out again if
     necessary.  */
  if (flaginfo.last_file_index != -1
      && (unsigned int) flaginfo.last_file.n_value != obj_raw_syment_count (abfd))
    {
      file_ptr pos;

      flaginfo.last_file.n_value = obj_raw_syment_count (abfd);
      bfd_coff_swap_sym_out (abfd, &flaginfo.last_file,
                             flaginfo.outsyms);

      pos = obj_sym_filepos (abfd) + flaginfo.last_file_index * symesz;
      if (bfd_seek (abfd, pos, SEEK_SET) != 0
          || bfd_bwrite (flaginfo.outsyms, symesz, abfd) != symesz)
        return false;
    }

  /* If doing task linking (ld --task-link) then make a pass through the
     global symbols, writing out any that are defined, and making them
     static.  */
  if (info->task_link)
    {
      flaginfo.failed = false;
      coff_link_hash_traverse (coff_hash_table (info),
                               _bfd_coff_write_task_globals, &flaginfo);
      if (flaginfo.failed)
        goto error_return;
    }

  /* Write out the global symbols.  */
  flaginfo.failed = false;
  bfd_hash_traverse (&info->hash->table, _bfd_coff_write_global_sym, &flaginfo);
  if (flaginfo.failed)
    goto error_return;

  /* The outsyms buffer is used by _bfd_coff_write_global_sym.  */
  free (flaginfo.outsyms);
  flaginfo.outsyms = NULL;

  if (bfd_link_relocatable (info) && max_output_reloc_count > 0)
    {
      /* Now that we have written out all the global symbols, we know
         the symbol indices to use for relocs against them, and we can
         finally write out the relocs.  */
      amt = max_output_reloc_count * relsz;
      external_relocs = (bfd_byte *) bfd_malloc (amt);
      if (external_relocs == NULL)
        goto error_return;

      for (o = abfd->sections; o != NULL; o = o->next)
        {
          struct internal_reloc *irel;
          struct internal_reloc *irelend;
          struct coff_link_hash_entry **rel_hash;
          bfd_byte *erel;

          if (o->reloc_count == 0)
            continue;

          irel = flaginfo.section_info[o->target_index].relocs;
          irelend = irel + o->reloc_count;
          rel_hash = flaginfo.section_info[o->target_index].rel_hashes;
          erel = external_relocs;
          for (; irel < irelend; irel++, rel_hash++, erel += relsz)
            {
              if (*rel_hash != NULL)
                {
                  BFD_ASSERT ((*rel_hash)->indx >= 0);
                  irel->r_symndx = (*rel_hash)->indx;
                }
              bfd_coff_swap_reloc_out (abfd, irel, erel);
            }

          if (bfd_seek (abfd, o->rel_filepos, SEEK_SET) != 0)
            goto error_return;
          if ((obj_pe (abfd) || obj_go32 (abfd)) && o->reloc_count >= 0xffff)
            {
              /* In PE COFF, write the count of relocs as the first
                 reloc.  The header overflow bit will be set
                 elsewhere. */
              struct internal_reloc incount;
              bfd_byte *excount = (bfd_byte *)bfd_malloc (relsz);

              memset (&incount, 0, sizeof (incount));
              incount.r_vaddr = o->reloc_count + 1;
              bfd_coff_swap_reloc_out (abfd, &incount, excount);
              if (bfd_bwrite (excount, relsz, abfd) != relsz)
                /* We'll leak, but it's an error anyway. */
                goto error_return;
              free (excount);
            }
          if (bfd_bwrite (external_relocs,
                          (bfd_size_type) relsz * o->reloc_count, abfd)
              != (bfd_size_type) relsz * o->reloc_count)
            goto error_return;
        }

      free (external_relocs);
      external_relocs = NULL;
    }

  /* Free up the section information.  */
  if (flaginfo.section_info != NULL)
    {
      unsigned int i;

      for (i = 0; i < abfd->section_count; i++)
        {
          free (flaginfo.section_info[i].relocs);
          free (flaginfo.section_info[i].rel_hashes);
        }
      free (flaginfo.section_info);
      flaginfo.section_info = NULL;
    }

  /* If we have optimized stabs strings, output them.  */
  if (coff_hash_table (info)->stab_info.stabstr != NULL)
    {
      if (! _bfd_write_stab_strings (abfd, &coff_hash_table (info)->stab_info))
        return false;
    }

  /* Write out the string table.  */
  if (obj_raw_syment_count (abfd) != 0 || long_section_names)
    {
      file_ptr pos;

      pos = obj_sym_filepos (abfd) + obj_raw_syment_count (abfd) * symesz;
      if (bfd_seek (abfd, pos, SEEK_SET) != 0)
        return false;

#if STRING_SIZE_SIZE == 4
      H_PUT_32 (abfd,
                _bfd_stringtab_size (flaginfo.strtab) + STRING_SIZE_SIZE,
                strbuf);
#else
 #error Change H_PUT_32 above
#endif

      if (bfd_bwrite (strbuf, (bfd_size_type) STRING_SIZE_SIZE, abfd)
          != STRING_SIZE_SIZE)
        return false;

      if (! _bfd_stringtab_emit (abfd, flaginfo.strtab))
        return false;

      obj_coff_strings_written (abfd) = true;
    }

  _bfd_stringtab_free (flaginfo.strtab);

  /* Setting symcount to 0 will cause write_object_contents to
     not try to write out the symbols.  */
  abfd->symcount = 0;

  return true;

 error_return:
  if (debug_merge_allocated)
    coff_debug_merge_hash_table_free (&flaginfo.debug_merge);
  if (flaginfo.strtab != NULL)
    _bfd_stringtab_free (flaginfo.strtab);
  if (flaginfo.section_info != NULL)
    {
      unsigned int i;

      for (i = 0; i < abfd->section_count; i++)
        {
          free (flaginfo.section_info[i].relocs);
          free (flaginfo.section_info[i].rel_hashes);
        }
      free (flaginfo.section_info);
    }
  free (flaginfo.internal_syms);
  free (flaginfo.sec_ptrs);
  free (flaginfo.sym_indices);
  free (flaginfo.outsyms);
  free (flaginfo.linenos);
  free (flaginfo.contents);
  free (flaginfo.external_relocs);
  free (flaginfo.internal_relocs);
  free (external_relocs);
  return false;
}

/* Parse out a -heap <reserved>,<commit> line.  */

static char *
dores_com (char *ptr, bfd *output_bfd, int heap)
{
  if (coff_data(output_bfd)->pe)
    {
      int val = strtoul (ptr, &ptr, 0);

      if (heap)
        pe_data(output_bfd)->pe_opthdr.SizeOfHeapReserve = val;
      else
        pe_data(output_bfd)->pe_opthdr.SizeOfStackReserve = val;

      if (ptr[0] == ',')
        {
          val = strtoul (ptr+1, &ptr, 0);
          if (heap)
            pe_data(output_bfd)->pe_opthdr.SizeOfHeapCommit = val;
          else
            pe_data(output_bfd)->pe_opthdr.SizeOfStackCommit = val;
        }
    }
  return ptr;
}

static char *
get_name (char *ptr, char **dst)
{
  while (*ptr == ' ')
    ptr++;
  *dst = ptr;
  while (*ptr && *ptr != ' ')
    ptr++;
  *ptr = 0;
  return ptr+1;
}

/* Process any magic embedded commands in a section called .drectve.  */

static int
process_embedded_commands (bfd *output_bfd,
                           struct bfd_link_info *info ATTRIBUTE_UNUSED,
                           bfd *abfd)
{
  asection *sec = bfd_get_section_by_name (abfd, ".drectve");
  char *s;
  char *e;
  bfd_byte *copy;

  if (!sec)
    return 1;

  if (!bfd_malloc_and_get_section (abfd, sec, &copy))
    {
      free (copy);
      return 0;
    }
  e = (char *) copy + sec->size;

  for (s = (char *) copy; s < e ; )
    {
      if (s[0] != '-')
        {
          s++;
          continue;
        }
      if (startswith (s, "-attr"))
        {
          char *name;
          char *attribs;
          asection *asec;
          int loop = 1;
          int had_write = 0;
          int had_exec= 0;

          s += 5;
          s = get_name (s, &name);
          s = get_name (s, &attribs);

          while (loop)
            {
              switch (*attribs++)
                {
                case 'W':
                  had_write = 1;
                  break;
                case 'R':
                  break;
                case 'S':
                  break;
                case 'X':
                  had_exec = 1;
                  break;
                default:
                  loop = 0;
                }
            }
          asec = bfd_get_section_by_name (abfd, name);
          if (asec)
            {
              if (had_exec)
                asec->flags |= SEC_CODE;
              if (!had_write)
                asec->flags |= SEC_READONLY;
            }
        }
      else if (startswith (s, "-heap"))
        s = dores_com (s + 5, output_bfd, 1);

      else if (startswith (s, "-stack"))
        s = dores_com (s + 6, output_bfd, 0);

      /* GNU extension for aligned commons.  */
      else if (startswith (s, "-aligncomm:"))
        {
          /* Common symbols must be aligned on reading, as it
          is too late to do anything here, after they have
          already been allocated, so just skip the directive.  */
          s += 11;
        }

      else
        s++;
    }
  free (copy);
  return 1;
}

/* Place a marker against all symbols which are used by relocations.
   This marker can be picked up by the 'do we skip this symbol ?'
   loop in _bfd_coff_link_input_bfd() and used to prevent skipping
   that symbol.  */

static void
mark_relocs (struct coff_final_link_info *flaginfo, bfd *input_bfd)
{
  asection * a;

  if ((bfd_get_file_flags (input_bfd) & HAS_SYMS) == 0)
    return;

  for (a = input_bfd->sections; a != (asection *) NULL; a = a->next)
    {
      struct internal_reloc *   internal_relocs;
      struct internal_reloc *   irel;
      struct internal_reloc *   irelend;

      if ((a->flags & SEC_RELOC) == 0 || a->reloc_count  < 1
          || a->linker_mark == 0)
        continue;
      /* Don't mark relocs in excluded sections.  */
      if (a->output_section == bfd_abs_section_ptr)
        continue;

      /* Read in the relocs.  */
      internal_relocs = _bfd_coff_read_internal_relocs
        (input_bfd, a, false,
         flaginfo->external_relocs,
         bfd_link_relocatable (flaginfo->info),
         (bfd_link_relocatable (flaginfo->info)
          ? (flaginfo->section_info[ a->output_section->target_index ].relocs + a->output_section->reloc_count)
          : flaginfo->internal_relocs)
        );

      if (internal_relocs == NULL)
        continue;

      irel     = internal_relocs;
      irelend  = irel + a->reloc_count;

      /* Place a mark in the sym_indices array (whose entries have
         been initialised to 0) for all of the symbols that are used
         in the relocation table.  This will then be picked up in the
         skip/don't-skip pass.  */
      for (; irel < irelend; irel++)
        if ((unsigned long) irel->r_symndx < obj_raw_syment_count (input_bfd))
          flaginfo->sym_indices[irel->r_symndx] = -1;
    }
}

/* Link an input file into the linker output file.  This function
   handles all the sections and relocations of the input file at once.  */

bool
_bfd_coff_link_input_bfd (struct coff_final_link_info *flaginfo, bfd *input_bfd)
{
  unsigned int n_tmask = coff_data (input_bfd)->local_n_tmask;
  unsigned int n_btshft = coff_data (input_bfd)->local_n_btshft;
  bool (*adjust_symndx)
    (bfd *, struct bfd_link_info *, bfd *, asection *,
     struct internal_reloc *, bool *);
  bfd *output_bfd;
  const char *strings;
  bfd_size_type syment_base;
  bool copy, hash;
  bfd_size_type isymesz;
  bfd_size_type osymesz;
  bfd_size_type linesz;
  bfd_byte *esym;
  bfd_byte *esym_end;
  struct internal_syment *isymp;
  asection **secpp;
  long *indexp;
  unsigned long output_index;
  bfd_byte *outsym;
  struct coff_link_hash_entry **sym_hash;
  asection *o;

  /* Move all the symbols to the output file.  */

  output_bfd = flaginfo->output_bfd;
  strings = NULL;
  syment_base = obj_raw_syment_count (output_bfd);
  isymesz = bfd_coff_symesz (input_bfd);
  osymesz = bfd_coff_symesz (output_bfd);
  linesz = bfd_coff_linesz (input_bfd);
  BFD_ASSERT (linesz == bfd_coff_linesz (output_bfd));

  copy = false;
  if (! flaginfo->info->keep_memory)
    copy = true;
  hash = true;
  if (flaginfo->info->traditional_format)
    hash = false;

  if (! _bfd_coff_get_external_symbols (input_bfd))
    return false;

  esym = (bfd_byte *) obj_coff_external_syms (input_bfd);
  esym_end = esym + obj_raw_syment_count (input_bfd) * isymesz;
  isymp = flaginfo->internal_syms;
  secpp = flaginfo->sec_ptrs;
  indexp = flaginfo->sym_indices;
  output_index = syment_base;
  outsym = flaginfo->outsyms;

  if (coff_data (output_bfd)->pe
      && ! process_embedded_commands (output_bfd, flaginfo->info, input_bfd))
    return false;

  /* If we are going to perform relocations and also strip/discard some
     symbols then we must make sure that we do not strip/discard those
     symbols that are going to be involved in the relocations.  */
  if ((   flaginfo->info->strip   != strip_none
       || flaginfo->info->discard != discard_none)
      && bfd_link_relocatable (flaginfo->info))
    {
      /* Mark the symbol array as 'not-used'.  */
      memset (indexp, 0, obj_raw_syment_count (input_bfd) * sizeof * indexp);

      mark_relocs (flaginfo, input_bfd);
    }

  while (esym < esym_end)
    {
      struct internal_syment isym;
      enum coff_symbol_classification classification;
      bool skip;
      bool global;
      bool dont_skip_symbol;
      int add;

      bfd_coff_swap_sym_in (input_bfd, esym, isymp);

      /* Make a copy of *isymp so that the relocate_section function
         always sees the original values.  This is more reliable than
         always recomputing the symbol value even if we are stripping
         the symbol.  */
      isym = *isymp;

      classification = bfd_coff_classify_symbol (input_bfd, &isym);
      switch (classification)
        {
        default:
          abort ();
        case COFF_SYMBOL_GLOBAL:
        case COFF_SYMBOL_PE_SECTION:
        case COFF_SYMBOL_LOCAL:
          *secpp = coff_section_from_bfd_index (input_bfd, isym.n_scnum);
          break;
        case COFF_SYMBOL_COMMON:
          *secpp = bfd_com_section_ptr;
          break;
        case COFF_SYMBOL_UNDEFINED:
          *secpp = bfd_und_section_ptr;
          break;
        }

      /* Extract the flag indicating if this symbol is used by a
         relocation.  */
      if ((flaginfo->info->strip != strip_none
           || flaginfo->info->discard != discard_none)
          && bfd_link_relocatable (flaginfo->info))
        dont_skip_symbol = *indexp;
      else
        dont_skip_symbol = false;

      *indexp = -1;

      skip = false;
      global = false;
      add = 1 + isym.n_numaux;

      /* If we are stripping all symbols, we want to skip this one.  */
      if (flaginfo->info->strip == strip_all && ! dont_skip_symbol)
        skip = true;

      if (! skip)
        {
          switch (classification)
            {
            default:
              abort ();
            case COFF_SYMBOL_GLOBAL:
            case COFF_SYMBOL_COMMON:
            case COFF_SYMBOL_PE_SECTION:
              /* This is a global symbol.  Global symbols come at the
                 end of the symbol table, so skip them for now.
                 Locally defined function symbols, however, are an
                 exception, and are not moved to the end.  */
              global = true;
              if (! ISFCN (isym.n_type))
                skip = true;
              break;

            case COFF_SYMBOL_UNDEFINED:
              /* Undefined symbols are left for the end.  */
              global = true;
              skip = true;
              break;

            case COFF_SYMBOL_LOCAL:
              /* This is a local symbol.  Skip it if we are discarding
                 local symbols.  */
              if (flaginfo->info->discard == discard_all && ! dont_skip_symbol)
                skip = true;
              break;
            }
        }

#ifndef COFF_WITH_PE
      /* Skip section symbols for sections which are not going to be
         emitted.  */
      if (!skip
          && !dont_skip_symbol
          && isym.n_sclass == C_STAT
          && isym.n_type == T_NULL
          && isym.n_numaux > 0
          && ((*secpp)->output_section == bfd_abs_section_ptr
              || bfd_section_removed_from_list (output_bfd,
                                                (*secpp)->output_section)))
        skip = true;
#endif

      /* If we stripping debugging symbols, and this is a debugging
         symbol, then skip it.  FIXME: gas sets the section to N_ABS
         for some types of debugging symbols; I don't know if this is
         a bug or not.  In any case, we handle it here.  */
      if (! skip
          && flaginfo->info->strip == strip_debugger
          && ! dont_skip_symbol
          && (isym.n_scnum == N_DEBUG
              || (isym.n_scnum == N_ABS
                  && (isym.n_sclass == C_AUTO
                      || isym.n_sclass == C_REG
                      || isym.n_sclass == C_MOS
                      || isym.n_sclass == C_MOE
                      || isym.n_sclass == C_MOU
                      || isym.n_sclass == C_ARG
                      || isym.n_sclass == C_REGPARM
                      || isym.n_sclass == C_FIELD
                      || isym.n_sclass == C_EOS))))
        skip = true;

      /* If some symbols are stripped based on the name, work out the
         name and decide whether to skip this symbol.  */
      if (! skip
          && (flaginfo->info->strip == strip_some
              || flaginfo->info->discard == discard_l))
        {
          const char *name;
          char buf[SYMNMLEN + 1];

          name = _bfd_coff_internal_syment_name (input_bfd, &isym, buf);
          if (name == NULL)
            return false;

          if (! dont_skip_symbol
              && ((flaginfo->info->strip == strip_some
                   && (bfd_hash_lookup (flaginfo->info->keep_hash, name, false,
                                    false) == NULL))
                   || (! global
                       && flaginfo->info->discard == discard_l
                       && bfd_is_local_label_name (input_bfd, name))))
            skip = true;
        }

      /* If this is an enum, struct, or union tag, see if we have
         already output an identical type.  */
      if (! skip
          && !flaginfo->info->traditional_format
          && (isym.n_sclass == C_ENTAG
              || isym.n_sclass == C_STRTAG
              || isym.n_sclass == C_UNTAG)
          && isym.n_numaux == 1)
        {
          const char *name;
          char buf[SYMNMLEN + 1];
          struct coff_debug_merge_hash_entry *mh;
          struct coff_debug_merge_type *mt;
          union internal_auxent aux;
          struct coff_debug_merge_element **epp;
          bfd_byte *esl, *eslend;
          struct internal_syment *islp;
          size_t amt;

          name = _bfd_coff_internal_syment_name (input_bfd, &isym, buf);
          if (name == NULL)
            return false;

          /* Ignore fake names invented by compiler; treat them all as
             the same name.  */
          if (*name == '~' || *name == '.' || *name == '$'
              || (*name == bfd_get_symbol_leading_char (input_bfd)
                  && (name[1] == '~' || name[1] == '.' || name[1] == '$')))
            name = "";

          mh = coff_debug_merge_hash_lookup (&flaginfo->debug_merge, name,
                                             true, true);
          if (mh == NULL)
            return false;

          /* Allocate memory to hold type information.  If this turns
             out to be a duplicate, we pass this address to
             bfd_release.  */
          amt = sizeof (struct coff_debug_merge_type);
          mt = (struct coff_debug_merge_type *) bfd_alloc (input_bfd, amt);
          if (mt == NULL)
            return false;
          mt->type_class = isym.n_sclass;

          /* Pick up the aux entry, which points to the end of the tag
             entries.  */
          bfd_coff_swap_aux_in (input_bfd, (esym + isymesz),
                                isym.n_type, isym.n_sclass, 0, isym.n_numaux,
                                &aux);

          /* Gather the elements.  */
          epp = &mt->elements;
          mt->elements = NULL;
          islp = isymp + 2;
          esl = esym + 2 * isymesz;
          eslend = ((bfd_byte *) obj_coff_external_syms (input_bfd)
                    + aux.x_sym.x_fcnary.x_fcn.x_endndx.l * isymesz);
          while (esl < eslend)
            {
              const char *elename;
              char elebuf[SYMNMLEN + 1];
              char *name_copy;

              bfd_coff_swap_sym_in (input_bfd, esl, islp);

              amt = sizeof (struct coff_debug_merge_element);
              *epp = (struct coff_debug_merge_element *)
                  bfd_alloc (input_bfd, amt);
              if (*epp == NULL)
                return false;

              elename = _bfd_coff_internal_syment_name (input_bfd, islp,
                                                        elebuf);
              if (elename == NULL)
                return false;

              amt = strlen (elename) + 1;
              name_copy = (char *) bfd_alloc (input_bfd, amt);
              if (name_copy == NULL)
                return false;
              strcpy (name_copy, elename);

              (*epp)->name = name_copy;
              (*epp)->type = islp->n_type;
              (*epp)->tagndx = 0;
              if (islp->n_numaux >= 1
                  && islp->n_type != T_NULL
                  && islp->n_sclass != C_EOS)
                {
                  union internal_auxent eleaux;
                  long indx;

                  bfd_coff_swap_aux_in (input_bfd, (esl + isymesz),
                                        islp->n_type, islp->n_sclass, 0,
                                        islp->n_numaux, &eleaux);
                  indx = eleaux.x_sym.x_tagndx.l;

                  /* FIXME: If this tagndx entry refers to a symbol
                     defined later in this file, we just ignore it.
                     Handling this correctly would be tedious, and may
                     not be required.  */
                  if (indx > 0
                      && (indx
                          < ((esym -
                              (bfd_byte *) obj_coff_external_syms (input_bfd))
                             / (long) isymesz)))
                    {
                      (*epp)->tagndx = flaginfo->sym_indices[indx];
                      if ((*epp)->tagndx < 0)
                        (*epp)->tagndx = 0;
                    }
                }
              epp = &(*epp)->next;
              *epp = NULL;

              esl += (islp->n_numaux + 1) * isymesz;
              islp += islp->n_numaux + 1;
            }

          /* See if we already have a definition which matches this
             type.  We always output the type if it has no elements,
             for simplicity.  */
          if (mt->elements == NULL)
            bfd_release (input_bfd, mt);
          else
            {
              struct coff_debug_merge_type *mtl;

              for (mtl = mh->types; mtl != NULL; mtl = mtl->next)
                {
                  struct coff_debug_merge_element *me, *mel;

                  if (mtl->type_class != mt->type_class)
                    continue;

                  for (me = mt->elements, mel = mtl->elements;
                       me != NULL && mel != NULL;
                       me = me->next, mel = mel->next)
                    {
                      if (strcmp (me->name, mel->name) != 0
                          || me->type != mel->type
                          || me->tagndx != mel->tagndx)
                        break;
                    }

                  if (me == NULL && mel == NULL)
                    break;
                }

              if (mtl == NULL || (bfd_size_type) mtl->indx >= syment_base)
                {
                  /* This is the first definition of this type.  */
                  mt->indx = output_index;
                  mt->next = mh->types;
                  mh->types = mt;
                }
              else
                {
                  /* This is a redefinition which can be merged.  */
                  bfd_release (input_bfd, mt);
                  *indexp = mtl->indx;
                  add = (eslend - esym) / isymesz;
                  skip = true;
                }
            }
        }

      /* We now know whether we are to skip this symbol or not.  */
      if (! skip)
        {
          /* Adjust the symbol in order to output it.  */

          if (isym._n._n_n._n_zeroes == 0
              && isym._n._n_n._n_offset != 0)
            {
              const char *name;
              bfd_size_type indx;

              /* This symbol has a long name.  Enter it in the string
                 table we are building.  Note that we do not check
                 bfd_coff_symname_in_debug.  That is only true for
                 XCOFF, and XCOFF requires different linking code
                 anyhow.  */
              name = _bfd_coff_internal_syment_name (input_bfd, &isym, NULL);
              if (name == NULL)
                return false;
              indx = _bfd_stringtab_add (flaginfo->strtab, name, hash, copy);
              if (indx == (bfd_size_type) -1)
                return false;
              isym._n._n_n._n_offset = STRING_SIZE_SIZE + indx;
            }

          switch (isym.n_sclass)
            {
            case C_AUTO:
            case C_MOS:
            case C_EOS:
            case C_MOE:
            case C_MOU:
            case C_UNTAG:
            case C_STRTAG:
            case C_ENTAG:
            case C_TPDEF:
            case C_ARG:
            case C_USTATIC:
            case C_REG:
            case C_REGPARM:
            case C_FIELD:
              /* The symbol value should not be modified.  */
              break;

            case C_FCN:
              if (obj_pe (input_bfd)
                  && memcmp (isym.n_name, ".bf", sizeof ".bf") != 0
                  && isym.n_scnum > 0)
                {
                  /* For PE, .lf and .ef get their value left alone,
                     while .bf gets relocated.  However, they all have
                     "real" section numbers, and need to be moved into
                     the new section.  */
                  isym.n_scnum = (*secpp)->output_section->target_index;
                  break;
                }
              /* Fall through.  */
            default:
            case C_LABEL:  /* Not completely sure about these 2 */
            case C_EXTDEF:
            case C_BLOCK:
            case C_EFCN:
            case C_NULL:
            case C_EXT:
            case C_STAT:
            case C_SECTION:
            case C_NT_WEAK:
              /* Compute new symbol location.  */
            if (isym.n_scnum > 0)
              {
                isym.n_scnum = (*secpp)->output_section->target_index;
                isym.n_value += (*secpp)->output_offset;
                if (! obj_pe (input_bfd))
                  isym.n_value -= (*secpp)->vma;
                if (! obj_pe (flaginfo->output_bfd))
                  isym.n_value += (*secpp)->output_section->vma;
              }
            break;

            case C_FILE:
              /* The value of a C_FILE symbol is the symbol index of
                 the next C_FILE symbol.  The value of the last C_FILE
                 symbol is the symbol index to the first external
                 symbol (actually, coff_renumber_symbols does not get
                 this right--it just sets the value of the last C_FILE
                 symbol to zero--and nobody has ever complained about
                 it).  We try to get this right, below, just before we
                 write the symbols out, but in the general case we may
                 have to write the symbol out twice.  */
              if (flaginfo->last_file_index != -1
                  && flaginfo->last_file.n_value != (bfd_vma) output_index)
                {
                  /* We must correct the value of the last C_FILE
                     entry.  */
                  flaginfo->last_file.n_value = output_index;
                  if ((bfd_size_type) flaginfo->last_file_index >= syment_base)
                    {
                      /* The last C_FILE symbol is in this input file.  */
                      bfd_coff_swap_sym_out (output_bfd,
                                             &flaginfo->last_file,
                                             (flaginfo->outsyms
                                              + ((flaginfo->last_file_index
                                                  - syment_base)
                                                 * osymesz)));
                    }
                  else
                    {
                      file_ptr pos;

                      /* We have already written out the last C_FILE
                         symbol.  We need to write it out again.  We
                         borrow *outsym temporarily.  */
                      bfd_coff_swap_sym_out (output_bfd,
                                             &flaginfo->last_file, outsym);
                      pos = obj_sym_filepos (output_bfd);
                      pos += flaginfo->last_file_index * osymesz;
                      if (bfd_seek (output_bfd, pos, SEEK_SET) != 0
                          || bfd_bwrite (outsym, osymesz, output_bfd) != osymesz)
                        return false;
                    }
                }

              flaginfo->last_file_index = output_index;
              flaginfo->last_file = isym;
              break;
            }

          /* If doing task linking, convert normal global function symbols to
             static functions.  */
          if (flaginfo->info->task_link && IS_EXTERNAL (input_bfd, isym))
            isym.n_sclass = C_STAT;

          /* Output the symbol.  */
          bfd_coff_swap_sym_out (output_bfd, &isym, outsym);

          *indexp = output_index;

          if (global)
            {
              long indx;
              struct coff_link_hash_entry *h;

              indx = ((esym - (bfd_byte *) obj_coff_external_syms (input_bfd))
                      / isymesz);
              h = obj_coff_sym_hashes (input_bfd)[indx];
              if (h == NULL)
                {
                  /* This can happen if there were errors earlier in
                     the link.  */
                  bfd_set_error (bfd_error_bad_value);
                  return false;
                }
              h->indx = output_index;
            }

          output_index += add;
          outsym += add * osymesz;
        }

      esym += add * isymesz;
      isymp += add;
      ++secpp;
      ++indexp;
      for (--add; add > 0; --add)
        {
          *secpp++ = NULL;
          *indexp++ = -1;
        }
    }

  /* Fix up the aux entries.  This must be done in a separate pass,
     because we don't know the correct symbol indices until we have
     already decided which symbols we are going to keep.  */
  esym = (bfd_byte *) obj_coff_external_syms (input_bfd);
  esym_end = esym + obj_raw_syment_count (input_bfd) * isymesz;
  isymp = flaginfo->internal_syms;
  indexp = flaginfo->sym_indices;
  sym_hash = obj_coff_sym_hashes (input_bfd);
  outsym = flaginfo->outsyms;

  while (esym < esym_end)
    {
      int add;

      add = 1 + isymp->n_numaux;

      if ((*indexp < 0
           || (bfd_size_type) *indexp < syment_base)
          && (*sym_hash == NULL
              || (*sym_hash)->auxbfd != input_bfd))
        esym += add * isymesz;
      else
        {
          struct coff_link_hash_entry *h;
          int i;

          h = NULL;
          if (*indexp < 0)
            {
              h = *sym_hash;

              /* The m68k-motorola-sysv assembler will sometimes
                 generate two symbols with the same name, but only one
                 will have aux entries.  */
              BFD_ASSERT (isymp->n_numaux == 0
                          || h->numaux == 0
                          || h->numaux == isymp->n_numaux);
            }

          esym += isymesz;

          if (h == NULL)
            outsym += osymesz;

          /* Handle the aux entries.  This handling is based on
             coff_pointerize_aux.  I don't know if it always correct.  */
          for (i = 0; i < isymp->n_numaux && esym < esym_end; i++)
            {
              union internal_auxent aux;
              union internal_auxent *auxp;

              if (h != NULL && h->aux != NULL && (h->numaux > i))
                auxp = h->aux + i;
              else
                {
                  bfd_coff_swap_aux_in (input_bfd, esym, isymp->n_type,
                                        isymp->n_sclass, i, isymp->n_numaux, &aux);
                  auxp = &aux;
                }

              if (isymp->n_sclass == C_FILE)
                {
                  /* If this is a long filename, we must put it in the
                     string table.  */
                  if (auxp->x_file.x_n.x_zeroes == 0
                      && auxp->x_file.x_n.x_offset != 0)
                    {
                      const char *filename;
                      bfd_size_type indx;

                      BFD_ASSERT (auxp->x_file.x_n.x_offset
                                  >= STRING_SIZE_SIZE);
                      if (strings == NULL)
                        {
                          strings = _bfd_coff_read_string_table (input_bfd);
                          if (strings == NULL)
                            return false;
                        }
                      if ((bfd_size_type) auxp->x_file.x_n.x_offset >= obj_coff_strings_len (input_bfd))
                        filename = _("<corrupt>");
                      else
                        filename = strings + auxp->x_file.x_n.x_offset;
                      indx = _bfd_stringtab_add (flaginfo->strtab, filename,
                                                 hash, copy);
                      if (indx == (bfd_size_type) -1)
                        return false;
                      auxp->x_file.x_n.x_offset = STRING_SIZE_SIZE + indx;
                    }
                }
              else if ((isymp->n_sclass != C_STAT || isymp->n_type != T_NULL)
                       && isymp->n_sclass != C_NT_WEAK)
                {
                  unsigned long indx;

                  if (ISFCN (isymp->n_type)
                      || ISTAG (isymp->n_sclass)
                      || isymp->n_sclass == C_BLOCK
                      || isymp->n_sclass == C_FCN)
                    {
                      indx = auxp->x_sym.x_fcnary.x_fcn.x_endndx.l;
                      if (indx > 0
                          && indx < obj_raw_syment_count (input_bfd))
                        {
                          /* We look forward through the symbol for
                             the index of the next symbol we are going
                             to include.  I don't know if this is
                             entirely right.  */
                          while ((flaginfo->sym_indices[indx] < 0
                                  || ((bfd_size_type) flaginfo->sym_indices[indx]
                                      < syment_base))
                                 && indx < obj_raw_syment_count (input_bfd))
                            ++indx;
                          if (indx >= obj_raw_syment_count (input_bfd))
                            indx = output_index;
                          else
                            indx = flaginfo->sym_indices[indx];
                          auxp->x_sym.x_fcnary.x_fcn.x_endndx.l = indx;
                        }
                    }

                  indx = auxp->x_sym.x_tagndx.l;
                  if (indx > 0 && indx < obj_raw_syment_count (input_bfd))
                    {
                      long symindx;

                      symindx = flaginfo->sym_indices[indx];
                      if (symindx < 0)
                        auxp->x_sym.x_tagndx.l = 0;
                      else
                        auxp->x_sym.x_tagndx.l = symindx;
                    }

                  /* The .bf symbols are supposed to be linked through
                     the endndx field.  We need to carry this list
                     across object files.  */
                  if (i == 0
                      && h == NULL
                      && isymp->n_sclass == C_FCN
                      && (isymp->_n._n_n._n_zeroes != 0
                          || isymp->_n._n_n._n_offset == 0)
                      && isymp->_n._n_name[0] == '.'
                      && isymp->_n._n_name[1] == 'b'
                      && isymp->_n._n_name[2] == 'f'
                      && isymp->_n._n_name[3] == '\0')
                    {
                      if (flaginfo->last_bf_index != -1)
                        {
                          flaginfo->last_bf.x_sym.x_fcnary.x_fcn.x_endndx.l =
                            *indexp;

                          if ((bfd_size_type) flaginfo->last_bf_index
                              >= syment_base)
                            {
                              void *auxout;

                              /* The last .bf symbol is in this input
                                 file.  This will only happen if the
                                 assembler did not set up the .bf
                                 endndx symbols correctly.  */
                              auxout = (flaginfo->outsyms
                                        + ((flaginfo->last_bf_index
                                            - syment_base)
                                           * osymesz));

                              bfd_coff_swap_aux_out (output_bfd,
                                                     &flaginfo->last_bf,
                                                     isymp->n_type,
                                                     isymp->n_sclass,
                                                     0, isymp->n_numaux,
                                                     auxout);
                            }
                          else
                            {
                              file_ptr pos;

                              /* We have already written out the last
                                 .bf aux entry.  We need to write it
                                 out again.  We borrow *outsym
                                 temporarily.  FIXME: This case should
                                 be made faster.  */
                              bfd_coff_swap_aux_out (output_bfd,
                                                     &flaginfo->last_bf,
                                                     isymp->n_type,
                                                     isymp->n_sclass,
                                                     0, isymp->n_numaux,
                                                     outsym);
                              pos = obj_sym_filepos (output_bfd);
                              pos += flaginfo->last_bf_index * osymesz;
                              if (bfd_seek (output_bfd, pos, SEEK_SET) != 0
                                  || (bfd_bwrite (outsym, osymesz, output_bfd)
                                      != osymesz))
                                return false;
                            }
                        }

                      if (auxp->x_sym.x_fcnary.x_fcn.x_endndx.l != 0)
                        flaginfo->last_bf_index = -1;
                      else
                        {
                          /* The endndx field of this aux entry must
                             be updated with the symbol number of the
                             next .bf symbol.  */
                          flaginfo->last_bf = *auxp;
                          flaginfo->last_bf_index = (((outsym - flaginfo->outsyms)
                                                   / osymesz)
                                                  + syment_base);
                        }
                    }
                }

              if (h == NULL)
                {
                  bfd_coff_swap_aux_out (output_bfd, auxp, isymp->n_type,
                                         isymp->n_sclass, i, isymp->n_numaux,
                                         outsym);
                  outsym += osymesz;
                }

              esym += isymesz;
            }
        }

      indexp += add;
      isymp += add;
      sym_hash += add;
    }

  /* Relocate the line numbers, unless we are stripping them.  */
  if (flaginfo->info->strip == strip_none
      || flaginfo->info->strip == strip_some)
    {
      for (o = input_bfd->sections; o != NULL; o = o->next)
        {
          bfd_vma offset;
          bfd_byte *eline;
          bfd_byte *elineend;
          bfd_byte *oeline;
          bool skipping;
          file_ptr pos;
          bfd_size_type amt;

          /* FIXME: If SEC_HAS_CONTENTS is not for the section, then
             build_link_order in ldwrite.c will not have created a
             link order, which means that we will not have seen this
             input section in _bfd_coff_final_link, which means that
             we will not have allocated space for the line numbers of
             this section.  I don't think line numbers can be
             meaningful for a section which does not have
             SEC_HAS_CONTENTS set, but, if they do, this must be
             changed.  */
          if (o->lineno_count == 0
              || (o->output_section->flags & SEC_HAS_CONTENTS) == 0)
            continue;

          if (bfd_seek (input_bfd, o->line_filepos, SEEK_SET) != 0
              || bfd_bread (flaginfo->linenos, linesz * o->lineno_count,
                           input_bfd) != linesz * o->lineno_count)
            return false;

          offset = o->output_section->vma + o->output_offset - o->vma;
          eline = flaginfo->linenos;
          oeline = flaginfo->linenos;
          elineend = eline + linesz * o->lineno_count;
          skipping = false;
          for (; eline < elineend; eline += linesz)
            {
              struct internal_lineno iline;

              bfd_coff_swap_lineno_in (input_bfd, eline, &iline);

              if (iline.l_lnno != 0)
                iline.l_addr.l_paddr += offset;
              else if (iline.l_addr.l_symndx >= 0
                       && ((unsigned long) iline.l_addr.l_symndx
                           < obj_raw_syment_count (input_bfd)))
                {
                  long indx;

                  indx = flaginfo->sym_indices[iline.l_addr.l_symndx];

                  if (indx < 0)
                    {
                      /* These line numbers are attached to a symbol
                         which we are stripping.  We must discard the
                         line numbers because reading them back with
                         no associated symbol (or associating them all
                         with symbol #0) will fail.  We can't regain
                         the space in the output file, but at least
                         they're dense.  */
                      skipping = true;
                    }
                  else
                    {
                      struct internal_syment is;
                      union internal_auxent ia;

                      /* Fix up the lnnoptr field in the aux entry of
                         the symbol.  It turns out that we can't do
                         this when we modify the symbol aux entries,
                         because gas sometimes screws up the lnnoptr
                         field and makes it an offset from the start
                         of the line numbers rather than an absolute
                         file index.  */
                      bfd_coff_swap_sym_in (output_bfd,
                                            (flaginfo->outsyms
                                             + ((indx - syment_base)
                                                * osymesz)), &is);
                      if ((ISFCN (is.n_type)
                           || is.n_sclass == C_BLOCK)
                          && is.n_numaux >= 1)
                        {
                          void *auxptr;

                          auxptr = (flaginfo->outsyms
                                    + ((indx - syment_base + 1)
                                       * osymesz));
                          bfd_coff_swap_aux_in (output_bfd, auxptr,
                                                is.n_type, is.n_sclass,
                                                0, is.n_numaux, &ia);
                          ia.x_sym.x_fcnary.x_fcn.x_lnnoptr =
                            (o->output_section->line_filepos
                             + o->output_section->lineno_count * linesz
                             + eline - flaginfo->linenos);
                          bfd_coff_swap_aux_out (output_bfd, &ia,
                                                 is.n_type, is.n_sclass, 0,
                                                 is.n_numaux, auxptr);
                        }

                      skipping = false;
                    }

                  iline.l_addr.l_symndx = indx;
                }

              if (!skipping)
                {
                  bfd_coff_swap_lineno_out (output_bfd, &iline, oeline);
                  oeline += linesz;
                }
            }

          pos = o->output_section->line_filepos;
          pos += o->output_section->lineno_count * linesz;
          amt = oeline - flaginfo->linenos;
          if (bfd_seek (output_bfd, pos, SEEK_SET) != 0
              || bfd_bwrite (flaginfo->linenos, amt, output_bfd) != amt)
            return false;

          o->output_section->lineno_count += amt / linesz;
        }
    }

  /* If we swapped out a C_FILE symbol, guess that the next C_FILE
     symbol will be the first symbol in the next input file.  In the
     normal case, this will save us from writing out the C_FILE symbol
     again.  */
  if (flaginfo->last_file_index != -1
      && (bfd_size_type) flaginfo->last_file_index >= syment_base)
    {
      flaginfo->last_file.n_value = output_index;
      bfd_coff_swap_sym_out (output_bfd, &flaginfo->last_file,
                             (flaginfo->outsyms
                              + ((flaginfo->last_file_index - syment_base)
                                 * osymesz)));
    }

  /* Write the modified symbols to the output file.  */
  if (outsym > flaginfo->outsyms)
    {
      file_ptr pos;
      bfd_size_type amt;

      pos = obj_sym_filepos (output_bfd) + syment_base * osymesz;
      amt = outsym - flaginfo->outsyms;
      if (bfd_seek (output_bfd, pos, SEEK_SET) != 0
          || bfd_bwrite (flaginfo->outsyms, amt, output_bfd) != amt)
        return false;

      BFD_ASSERT ((obj_raw_syment_count (output_bfd)
                   + (outsym - flaginfo->outsyms) / osymesz)
                  == output_index);

      obj_raw_syment_count (output_bfd) = output_index;
    }

  /* Relocate the contents of each section.  */
  adjust_symndx = coff_backend_info (input_bfd)->_bfd_coff_adjust_symndx;
  for (o = input_bfd->sections; o != NULL; o = o->next)
    {
      bfd_byte *contents;
      struct coff_section_tdata *secdata;

      if (! o->linker_mark)
        /* This section was omitted from the link.  */
        continue;

      if ((o->flags & SEC_LINKER_CREATED) != 0)
        continue;

      if ((o->flags & SEC_HAS_CONTENTS) == 0
          || (o->size == 0 && (o->flags & SEC_RELOC) == 0))
        {
          if ((o->flags & SEC_RELOC) != 0
              && o->reloc_count != 0)
            {
              _bfd_error_handler
                /* xgettext: c-format */
                (_("%pB: relocs in section `%pA', but it has no contents"),
                 input_bfd, o);
              bfd_set_error (bfd_error_no_contents);
              return false;
            }

          continue;
        }

      secdata = coff_section_data (input_bfd, o);
      if (secdata != NULL && secdata->contents != NULL)
        contents = secdata->contents;
      else
        {
          contents = flaginfo->contents;
          if (! bfd_get_full_section_contents (input_bfd, o, &contents))
            return false;
        }

      if ((o->flags & SEC_RELOC) != 0)
        {
          int target_index;
          struct internal_reloc *internal_relocs;
          struct internal_reloc *irel;

          /* Read in the relocs.  */
          target_index = o->output_section->target_index;
          internal_relocs = (_bfd_coff_read_internal_relocs
                             (input_bfd, o, false, flaginfo->external_relocs,
                              bfd_link_relocatable (flaginfo->info),
                              (bfd_link_relocatable (flaginfo->info)
                               ? (flaginfo->section_info[target_index].relocs
                                  + o->output_section->reloc_count)
                               : flaginfo->internal_relocs)));
          if (internal_relocs == NULL
              && o->reloc_count > 0)
            return false;

          /* Run through the relocs looking for relocs against symbols
             coming from discarded sections and complain about them.  */
          irel = internal_relocs;
          for (; irel < &internal_relocs[o->reloc_count]; irel++)
            {
              struct coff_link_hash_entry *h;
              asection *ps = NULL;
              long symndx = irel->r_symndx;
              if (symndx < 0)
                continue;
              h = obj_coff_sym_hashes (input_bfd)[symndx];
              if (h == NULL)
                continue;
              while (h->root.type == bfd_link_hash_indirect
                     || h->root.type == bfd_link_hash_warning)
                h = (struct coff_link_hash_entry *) h->root.u.i.link;
              if (h->root.type == bfd_link_hash_defined
                  || h->root.type == bfd_link_hash_defweak)
                ps = h->root.u.def.section;
              if (ps == NULL)
                continue;
              /* Complain if definition comes from an excluded section.  */
              if (ps->flags & SEC_EXCLUDE)
                (*flaginfo->info->callbacks->einfo)
                  /* xgettext: c-format */
                  (_("%X`%s' referenced in section `%pA' of %pB: "
                     "defined in discarded section `%pA' of %pB\n"),
                   h->root.root.string, o, input_bfd, ps, ps->owner);
            }

          /* Call processor specific code to relocate the section
             contents.  */
          if (! bfd_coff_relocate_section (output_bfd, flaginfo->info,
                                           input_bfd, o,
                                           contents,
                                           internal_relocs,
                                           flaginfo->internal_syms,
                                           flaginfo->sec_ptrs))
            return false;

          if (bfd_link_relocatable (flaginfo->info))
            {
              bfd_vma offset;
              struct internal_reloc *irelend;
              struct coff_link_hash_entry **rel_hash;

              offset = o->output_section->vma + o->output_offset - o->vma;
              irel = internal_relocs;
              irelend = irel + o->reloc_count;
              rel_hash = (flaginfo->section_info[target_index].rel_hashes
                          + o->output_section->reloc_count);
              for (; irel < irelend; irel++, rel_hash++)
                {
                  struct coff_link_hash_entry *h;
                  bool adjusted;

                  *rel_hash = NULL;

                  /* Adjust the reloc address and symbol index.  */
                  irel->r_vaddr += offset;

                  if (irel->r_symndx == -1)
                    continue;

                  if (adjust_symndx)
                    {
                      if (! (*adjust_symndx) (output_bfd, flaginfo->info,
                                              input_bfd, o, irel,
                                              &adjusted))
                        return false;
                      if (adjusted)
                        continue;
                    }

                  h = obj_coff_sym_hashes (input_bfd)[irel->r_symndx];
                  if (h != NULL)
                    {
                      /* This is a global symbol.  */
                      if (h->indx >= 0)
                        irel->r_symndx = h->indx;
                      else
                        {
                          /* This symbol is being written at the end
                             of the file, and we do not yet know the
                             symbol index.  We save the pointer to the
                             hash table entry in the rel_hash list.
                             We set the indx field to -2 to indicate
                             that this symbol must not be stripped.  */
                          *rel_hash = h;
                          h->indx = -2;
                        }
                    }
                  else
                    {
                      long indx;

                      indx = flaginfo->sym_indices[irel->r_symndx];
                      if (indx != -1)
                        irel->r_symndx = indx;
                      else
                        {
                          struct internal_syment *is;
                          const char *name;
                          char buf[SYMNMLEN + 1];

                          /* This reloc is against a symbol we are
                             stripping.  This should have been handled
                             by the 'dont_skip_symbol' code in the while
                             loop at the top of this function.  */
                          is = flaginfo->internal_syms + irel->r_symndx;

                          name = (_bfd_coff_internal_syment_name
                                  (input_bfd, is, buf));
                          if (name == NULL)
                            return false;

                          (*flaginfo->info->callbacks->unattached_reloc)
                            (flaginfo->info, name, input_bfd, o, irel->r_vaddr);
                        }
                    }
                }

              o->output_section->reloc_count += o->reloc_count;
            }
        }

      /* Write out the modified section contents.  */
      if (secdata == NULL || secdata->stab_info == NULL)
        {
          file_ptr loc = (o->output_offset
                          * bfd_octets_per_byte (output_bfd, o));
          if (! bfd_set_section_contents (output_bfd, o->output_section,
                                          contents, loc, o->size))
            return false;
        }
      else
        {
          if (! (_bfd_write_section_stabs
                 (output_bfd, &coff_hash_table (flaginfo->info)->stab_info,
                  o, &secdata->stab_info, contents)))
            return false;
        }
    }

  if (! flaginfo->info->keep_memory
      && ! _bfd_coff_free_symbols (input_bfd))
    return false;

  return true;
}

/* Write out a global symbol.  Called via bfd_hash_traverse.  */

bool
_bfd_coff_write_global_sym (struct bfd_hash_entry *bh, void *data)
{
  struct coff_link_hash_entry *h = (struct coff_link_hash_entry *) bh;
  struct coff_final_link_info *flaginfo = (struct coff_final_link_info *) data;
  bfd *output_bfd;
  struct internal_syment isym;
  bfd_size_type symesz;
  unsigned int i;
  file_ptr pos;

  output_bfd = flaginfo->output_bfd;

  if (h->root.type == bfd_link_hash_warning)
    {
      h = (struct coff_link_hash_entry *) h->root.u.i.link;
      if (h->root.type == bfd_link_hash_new)
        return true;
    }

  if (h->indx >= 0)
    return true;

  if (h->indx != -2
      && (flaginfo->info->strip == strip_all
          || (flaginfo->info->strip == strip_some
              && (bfd_hash_lookup (flaginfo->info->keep_hash,
                                   h->root.root.string, false, false)
                  == NULL))))
    return true;

  switch (h->root.type)
    {
    default:
    case bfd_link_hash_new:
    case bfd_link_hash_warning:
      abort ();
      return false;

    case bfd_link_hash_undefined:
      if (h->indx == -3)
        return true;
      /* Fall through.  */
    case bfd_link_hash_undefweak:
      isym.n_scnum = N_UNDEF;
      isym.n_value = 0;
      break;

    case bfd_link_hash_defined:
    case bfd_link_hash_defweak:
      {
        asection *sec;

        sec = h->root.u.def.section->output_section;
        if (bfd_is_abs_section (sec))
          isym.n_scnum = N_ABS;
        else
          isym.n_scnum = sec->target_index;
        isym.n_value = (h->root.u.def.value
                        + h->root.u.def.section->output_offset);
        if (! obj_pe (flaginfo->output_bfd))
          isym.n_value += sec->vma;
#ifdef BFD64
        if (isym.n_value > (bfd_vma) 0xffffffff)
          {
            if (! h->root.linker_def)
              {
                char value_buf[128];

                sprintf_vma (value_buf, isym.n_value);
                _bfd_error_handler
                  (_("%pB: stripping non-representable symbol '%s' (value 0x%s)"),
                   output_bfd, h->root.root.string, value_buf);
              }
            return true;
          }
#endif
      }
      break;

    case bfd_link_hash_common:
      isym.n_scnum = N_UNDEF;
      isym.n_value = h->root.u.c.size;
      break;

    case bfd_link_hash_indirect:
      /* Just ignore these.  They can't be handled anyhow.  */
      return true;
    }

  if (strlen (h->root.root.string) <= SYMNMLEN)
    strncpy (isym._n._n_name, h->root.root.string, SYMNMLEN);
  else
    {
      bool hash;
      bfd_size_type indx;

      hash = true;
      if (flaginfo->info->traditional_format)
        hash = false;
      indx = _bfd_stringtab_add (flaginfo->strtab, h->root.root.string, hash,
                                 false);
      if (indx == (bfd_size_type) -1)
        {
          flaginfo->failed = true;
          return false;
        }
      isym._n._n_n._n_zeroes = 0;
      isym._n._n_n._n_offset = STRING_SIZE_SIZE + indx;
    }

  isym.n_sclass = h->symbol_class;
  isym.n_type = h->type;

  if (isym.n_sclass == C_NULL)
    isym.n_sclass = C_EXT;

  /* If doing task linking and this is the pass where we convert
     defined globals to statics, then do that conversion now.  If the
     symbol is not being converted, just ignore it and it will be
     output during a later pass.  */
  if (flaginfo->global_to_static)
    {
      if (! IS_EXTERNAL (output_bfd, isym))
        return true;

      isym.n_sclass = C_STAT;
    }

  /* When a weak symbol is not overridden by a strong one,
     turn it into an external symbol when not building a
     shared or relocatable object.  */
  if (! bfd_link_pic (flaginfo->info)
      && ! bfd_link_relocatable (flaginfo->info)
      && IS_WEAK_EXTERNAL (flaginfo->output_bfd, isym))
    isym.n_sclass = C_EXT;

  isym.n_numaux = h->numaux;

  bfd_coff_swap_sym_out (output_bfd, &isym, flaginfo->outsyms);

  symesz = bfd_coff_symesz (output_bfd);

  pos = obj_sym_filepos (output_bfd);
  pos += obj_raw_syment_count (output_bfd) * symesz;
  if (bfd_seek (output_bfd, pos, SEEK_SET) != 0
      || bfd_bwrite (flaginfo->outsyms, symesz, output_bfd) != symesz)
    {
      flaginfo->failed = true;
      return false;
    }

  h->indx = obj_raw_syment_count (output_bfd);

  ++obj_raw_syment_count (output_bfd);

  /* Write out any associated aux entries.  Most of the aux entries
     will have been modified in _bfd_coff_link_input_bfd.  We have to
     handle section aux entries here, now that we have the final
     relocation and line number counts.  */
  for (i = 0; i < isym.n_numaux; i++)
    {
      union internal_auxent *auxp;

      auxp = h->aux + i;

      /* Look for a section aux entry here using the same tests that
         coff_swap_aux_out uses.  */
      if (i == 0
          && (isym.n_sclass == C_STAT
              || isym.n_sclass == C_HIDDEN)
          && isym.n_type == T_NULL
          && (h->root.type == bfd_link_hash_defined
              || h->root.type == bfd_link_hash_defweak))
        {
          asection *sec;

          sec = h->root.u.def.section->output_section;
          if (sec != NULL)
            {
              auxp->x_scn.x_scnlen = sec->size;

              /* For PE, an overflow on the final link reportedly does
                 not matter.  FIXME: Why not?  */
              if (sec->reloc_count > 0xffff
                  && (! obj_pe (output_bfd)
                      || bfd_link_relocatable (flaginfo->info)))
                _bfd_error_handler
                  /* xgettext: c-format */
                  (_("%pB: %pA: reloc overflow: %#x > 0xffff"),
                   output_bfd, sec, sec->reloc_count);

              if (sec->lineno_count > 0xffff
                  && (! obj_pe (output_bfd)
                      || bfd_link_relocatable (flaginfo->info)))
                _bfd_error_handler
                  /* xgettext: c-format */
                  (_("%pB: warning: %pA: line number overflow: %#x > 0xffff"),
                   output_bfd, sec, sec->lineno_count);

              auxp->x_scn.x_nreloc = sec->reloc_count;
              auxp->x_scn.x_nlinno = sec->lineno_count;
              auxp->x_scn.x_checksum = 0;
              auxp->x_scn.x_associated = 0;
              auxp->x_scn.x_comdat = 0;
            }
        }

      bfd_coff_swap_aux_out (output_bfd, auxp, isym.n_type,
                             isym.n_sclass, (int) i, isym.n_numaux,
                             flaginfo->outsyms);
      if (bfd_bwrite (flaginfo->outsyms, symesz, output_bfd) != symesz)
        {
          flaginfo->failed = true;
          return false;
        }
      ++obj_raw_syment_count (output_bfd);
    }

  return true;
}

/* Write out task global symbols, converting them to statics.  Called
   via coff_link_hash_traverse.  Calls bfd_coff_write_global_sym to do
   the dirty work, if the symbol we are processing needs conversion.  */

bool
_bfd_coff_write_task_globals (struct coff_link_hash_entry *h, void *data)
{
  struct coff_final_link_info *flaginfo = (struct coff_final_link_info *) data;
  bool rtnval = true;
  bool save_global_to_static;

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

  if (h->indx < 0)
    {
      switch (h->root.type)
        {
        case bfd_link_hash_defined:
        case bfd_link_hash_defweak:
          save_global_to_static = flaginfo->global_to_static;
          flaginfo->global_to_static = true;
          rtnval = _bfd_coff_write_global_sym (&h->root.root, data);
          flaginfo->global_to_static = save_global_to_static;
          break;
        default:
          break;
        }
    }
  return (rtnval);
}

/* Handle a link order which is supposed to generate a reloc.  */

bool
_bfd_coff_reloc_link_order (bfd *output_bfd,
                            struct coff_final_link_info *flaginfo,
                            asection *output_section,
                            struct bfd_link_order *link_order)
{
  reloc_howto_type *howto;
  struct internal_reloc *irel;
  struct coff_link_hash_entry **rel_hash_ptr;

  howto = bfd_reloc_type_lookup (output_bfd, link_order->u.reloc.p->reloc);
  if (howto == NULL)
    {
      bfd_set_error (bfd_error_bad_value);
      return false;
    }

  if (link_order->u.reloc.p->addend != 0)
    {
      bfd_size_type size;
      bfd_byte *buf;
      bfd_reloc_status_type rstat;
      bool ok;
      file_ptr loc;

      size = bfd_get_reloc_size (howto);
      buf = (bfd_byte *) bfd_zmalloc (size);
      if (buf == NULL && size != 0)
        return false;

      rstat = _bfd_relocate_contents (howto, output_bfd,
                                      (bfd_vma) link_order->u.reloc.p->addend,
                                      buf);
      switch (rstat)
        {
        case bfd_reloc_ok:
          break;
        default:
        case bfd_reloc_outofrange:
          abort ();
        case bfd_reloc_overflow:
          (*flaginfo->info->callbacks->reloc_overflow)
            (flaginfo->info, NULL,
             (link_order->type == bfd_section_reloc_link_order
              ? bfd_section_name (link_order->u.reloc.p->u.section)
              : link_order->u.reloc.p->u.name),
             howto->name, link_order->u.reloc.p->addend,
             (bfd *) NULL, (asection *) NULL, (bfd_vma) 0);
          break;
        }
      loc = link_order->offset * bfd_octets_per_byte (output_bfd,
                                                      output_section);
      ok = bfd_set_section_contents (output_bfd, output_section, buf,
                                     loc, size);
      free (buf);
      if (! ok)
        return false;
    }

  /* Store the reloc information in the right place.  It will get
     swapped and written out at the end of the final_link routine.  */
  irel = (flaginfo->section_info[output_section->target_index].relocs
          + output_section->reloc_count);
  rel_hash_ptr = (flaginfo->section_info[output_section->target_index].rel_hashes
                  + output_section->reloc_count);

  memset (irel, 0, sizeof (struct internal_reloc));
  *rel_hash_ptr = NULL;

  irel->r_vaddr = output_section->vma + link_order->offset;

  if (link_order->type == bfd_section_reloc_link_order)
    {
      /* We need to somehow locate a symbol in the right section.  The
         symbol must either have a value of zero, or we must adjust
         the addend by the value of the symbol.  FIXME: Write this
         when we need it.  The old linker couldn't handle this anyhow.  */
      abort ();
      *rel_hash_ptr = NULL;
      irel->r_symndx = 0;
    }
  else
    {
      struct coff_link_hash_entry *h;

      h = ((struct coff_link_hash_entry *)
           bfd_wrapped_link_hash_lookup (output_bfd, flaginfo->info,
                                         link_order->u.reloc.p->u.name,
                                         false, false, true));
      if (h != NULL)
        {
          if (h->indx >= 0)
            irel->r_symndx = h->indx;
          else
            {
              /* Set the index to -2 to force this symbol to get
                 written out.  */
              h->indx = -2;
              *rel_hash_ptr = h;
              irel->r_symndx = 0;
            }
        }
      else
        {
          (*flaginfo->info->callbacks->unattached_reloc)
            (flaginfo->info, link_order->u.reloc.p->u.name,
             (bfd *) NULL, (asection *) NULL, (bfd_vma) 0);
          irel->r_symndx = 0;
        }
    }

  /* FIXME: Is this always right?  */
  irel->r_type = howto->type;

  /* r_size is only used on the RS/6000, which needs its own linker
     routines anyhow.  r_extern is only used for ECOFF.  */

  /* FIXME: What is the right value for r_offset?  Is zero OK?  */
  ++output_section->reloc_count;

  return true;
}

/* A basic reloc handling routine which may be used by processors with
   simple relocs.  */

bool
_bfd_coff_generic_relocate_section (bfd *output_bfd,
                                    struct bfd_link_info *info,
                                    bfd *input_bfd,
                                    asection *input_section,
                                    bfd_byte *contents,
                                    struct internal_reloc *relocs,
                                    struct internal_syment *syms,
                                    asection **sections)
{
  struct internal_reloc *rel;
  struct internal_reloc *relend;

  rel = relocs;
  relend = rel + input_section->reloc_count;
  for (; rel < relend; rel++)
    {
      long symndx;
      struct coff_link_hash_entry *h;
      struct internal_syment *sym;
      bfd_vma addend;
      bfd_vma val;
      asection *sec;
      reloc_howto_type *howto;
      bfd_reloc_status_type rstat;

      symndx = rel->r_symndx;

      if (symndx == -1)
        {
          h = NULL;
          sym = NULL;
        }
      else if (symndx < 0
               || (unsigned long) symndx >= obj_raw_syment_count (input_bfd))
        {
          _bfd_error_handler
            /* xgettext: c-format */
            (_("%pB: illegal symbol index %ld in relocs"), input_bfd, symndx);
          return false;
        }
      else
        {
          h = obj_coff_sym_hashes (input_bfd)[symndx];
          sym = syms + symndx;
        }

      /* COFF treats common symbols in one of two ways.  Either the
         size of the symbol is included in the section contents, or it
         is not.  We assume that the size is not included, and force
         the rtype_to_howto function to adjust the addend as needed.  */
      if (sym != NULL && sym->n_scnum != 0)
        addend = - sym->n_value;
      else
        addend = 0;

      howto = bfd_coff_rtype_to_howto (input_bfd, input_section, rel, h,
                                       sym, &addend);
      if (howto == NULL)
        return false;

      /* If we are doing a relocatable link, then we can just ignore
         a PC relative reloc that is pcrel_offset.  It will already
         have the correct value.  If this is not a relocatable link,
         then we should ignore the symbol value.  */
      if (howto->pc_relative && howto->pcrel_offset)
        {
          if (bfd_link_relocatable (info))
            continue;
          if (sym != NULL && sym->n_scnum != 0)
            addend += sym->n_value;
        }

      val = 0;
      sec = NULL;
      if (h == NULL)
        {
          if (symndx == -1)
            {
              sec = bfd_abs_section_ptr;
              val = 0;
            }
          else
            {
              sec = sections[symndx];

              /* PR 19623: Relocations against symbols in
                 the absolute sections should ignored.  */
              if (bfd_is_abs_section (sec))
                continue;

              val = (sec->output_section->vma
                     + sec->output_offset
                     + sym->n_value);
              if (! obj_pe (input_bfd))
                val -= sec->vma;
            }
        }
      else
        {
          if (h->root.type == bfd_link_hash_defined
              || h->root.type == bfd_link_hash_defweak)
            {
              /* Defined weak symbols are a GNU extension. */
              sec = h->root.u.def.section;
              val = (h->root.u.def.value
                     + sec->output_section->vma
                     + sec->output_offset);
            }

          else if (h->root.type == bfd_link_hash_undefweak)
            {
              if (h->symbol_class == C_NT_WEAK && h->numaux == 1)
                {
                  /* See _Microsoft Portable Executable and Common Object
                     File Format Specification_, section 5.5.3.
                     Note that weak symbols without aux records are a GNU
                     extension.
                     FIXME: All weak externals are treated as having
                     characteristic IMAGE_WEAK_EXTERN_SEARCH_NOLIBRARY (1).
                     These behave as per SVR4 ABI:  A library member
                     will resolve a weak external only if a normal
                     external causes the library member to be linked.
                     See also linker.c: generic_link_check_archive_element. */
                  struct coff_link_hash_entry *h2 =
                    h->auxbfd->tdata.coff_obj_data->sym_hashes[
                    h->aux->x_sym.x_tagndx.l];

                  if (!h2 || h2->root.type == bfd_link_hash_undefined)
                    {
                      sec = bfd_abs_section_ptr;
                      val = 0;
                    }
                  else
                    {
                      sec = h2->root.u.def.section;
                      val = h2->root.u.def.value
                        + sec->output_section->vma + sec->output_offset;
                    }
                }
              else
                /* This is a GNU extension.  */
                val = 0;
            }

          else if (! bfd_link_relocatable (info))
            {
              (*info->callbacks->undefined_symbol)
                (info, h->root.root.string, input_bfd, input_section,
                 rel->r_vaddr - input_section->vma, true);
              /* Stop the linker from issueing errors about truncated relocs
                 referencing this undefined symbol by giving it an address
                 that should be in range.  */
              val = input_section->output_section->vma;
            }
        }

      /* If the input section defining the symbol has been discarded
         then zero this reloc field.  */
      if (sec != NULL && discarded_section (sec))
        {
          _bfd_clear_contents (howto, input_bfd, input_section,
                               contents, rel->r_vaddr - input_section->vma);
          continue;
        }

      if (info->base_file)
        {
          /* Emit a reloc if the backend thinks it needs it.  */
          if (sym && pe_data (output_bfd)->in_reloc_p (output_bfd, howto))
            {
              /* Relocation to a symbol in a section which isn't
                 absolute.  We output the address here to a file.
                 This file is then read by dlltool when generating the
                 reloc section.  Note that the base file is not
                 portable between systems.  We write out a bfd_vma here,
                 and dlltool reads in a bfd_vma.  */
              bfd_vma addr = (rel->r_vaddr
                           - input_section->vma
                           + input_section->output_offset
                           + input_section->output_section->vma);
              if (coff_data (output_bfd)->pe)
                addr -= pe_data(output_bfd)->pe_opthdr.ImageBase;
              if (fwrite (&addr, 1, sizeof (bfd_vma), (FILE *) info->base_file)
                  != sizeof (bfd_vma))
                {
                  bfd_set_error (bfd_error_system_call);
                  return false;
                }
            }
        }

      rstat = _bfd_final_link_relocate (howto, input_bfd, input_section,
                                        contents,
                                        rel->r_vaddr - input_section->vma,
                                        val, addend);

      switch (rstat)
        {
        default:
          abort ();
        case bfd_reloc_ok:
          break;
        case bfd_reloc_outofrange:
          _bfd_error_handler
            /* xgettext: c-format */
            (_("%pB: bad reloc address %#" PRIx64 " in section `%pA'"),
             input_bfd, (uint64_t) rel->r_vaddr, input_section);
          return false;
        case bfd_reloc_overflow:
          {

            /* Ignore any weak undef symbols that may have overflowed.  Due to
               PR ld/19011 the base address is now in the upper 64-bit address
               range.  This means that when _bfd_final_link_relocate calculates
               the overlow it takes the distance between the symbol and the VMA
               which will now always overflow as 0 - 64-bit addr > 32-bit range
               of the relocation.  This ends up creating PR ld/26659.  */
            if (val == 0
                /* Reverse the hack where 4 is subtracted from the addend.  */
                && (addend + 4) == 0
                && sym->n_sclass == C_NT_WEAK
                && bfd_coff_classify_symbol (output_bfd, sym)
                     == COFF_SYMBOL_UNDEFINED)
              break;

            const char *name;
            char buf[SYMNMLEN + 1];

            if (symndx == -1)
              name = "*ABS*";
            else if (h != NULL)
              name = NULL;
            else
              {
                name = _bfd_coff_internal_syment_name (input_bfd, sym, buf);
                if (name == NULL)
                  return false;
              }

            (*info->callbacks->reloc_overflow)
              (info, (h ? &h->root : NULL), name, howto->name,
               (bfd_vma) 0, input_bfd, input_section,
               rel->r_vaddr - input_section->vma);
          }
        }
    }
  return true;
}