PR22471, undefined reference to linker-defined symbols
[deliverable/binutils-gdb.git] / bfd / linker.c
index d4b053c9c6f905dffc7b1e7044fe9a90078fe599..9c19df4e5707b7739bf4006cd2fa810a6dfc661c 100644 (file)
@@ -1,5 +1,5 @@
 /* linker.c -- BFD linker routines
-   Copyright (C) 1993-2014 Free Software Foundation, Inc.
+   Copyright (C) 1993-2017 Free Software Foundation, Inc.
    Written by Steve Chamberlain and Ian Lance Taylor, Cygnus Support
 
    This file is part of BFD, the Binary File Descriptor library.
@@ -403,21 +403,12 @@ SUBSUBSECTION
 */
 
 static bfd_boolean generic_link_add_object_symbols
-  (bfd *, struct bfd_link_info *, bfd_boolean collect);
-static bfd_boolean generic_link_add_symbols
-  (bfd *, struct bfd_link_info *, bfd_boolean);
-static bfd_boolean generic_link_check_archive_element_no_collect
-  (bfd *, struct bfd_link_info *, struct bfd_link_hash_entry *, const char *,
-   bfd_boolean *);
-static bfd_boolean generic_link_check_archive_element_collect
-  (bfd *, struct bfd_link_info *, struct bfd_link_hash_entry *, const char *,
-   bfd_boolean *);
+  (bfd *, struct bfd_link_info *);
 static bfd_boolean generic_link_check_archive_element
   (bfd *, struct bfd_link_info *, struct bfd_link_hash_entry *, const char *,
-   bfd_boolean *, bfd_boolean);
+   bfd_boolean *);
 static bfd_boolean generic_link_add_symbol_list
-  (bfd *, struct bfd_link_info *, bfd_size_type count, asymbol **,
-   bfd_boolean);
+  (bfd *, struct bfd_link_info *, bfd_size_type count, asymbol **);
 static bfd_boolean generic_add_output_symbol
   (bfd *, size_t *psymalloc, asymbol *);
 static bfd_boolean default_data_link_order
@@ -816,29 +807,6 @@ bfd_generic_link_read_symbols (bfd *abfd)
   return TRUE;
 }
 \f
-/* Generic function to add symbols to from an object file to the
-   global hash table.  This version does not automatically collect
-   constructors by name.  */
-
-bfd_boolean
-_bfd_generic_link_add_symbols (bfd *abfd, struct bfd_link_info *info)
-{
-  return generic_link_add_symbols (abfd, info, FALSE);
-}
-
-/* Generic function to add symbols from an object file to the global
-   hash table.  This version automatically collects constructors by
-   name, as the collect2 program does.  It should be used for any
-   target which does not provide some other mechanism for setting up
-   constructors and destructors; these are approximately those targets
-   for which gcc uses collect2 and do not support stabs.  */
-
-bfd_boolean
-_bfd_generic_link_add_symbols_collect (bfd *abfd, struct bfd_link_info *info)
-{
-  return generic_link_add_symbols (abfd, info, TRUE);
-}
-
 /* Indicate that we are only retrieving symbol values from this
    section.  We want the symbols to act as though the values in the
    file are absolute.  */
@@ -862,26 +830,22 @@ _bfd_generic_copy_link_hash_symbol_type (bfd *abfd ATTRIBUTE_UNUSED,
 {
 }
 
-/* Add symbols from an object file to the global hash table.  */
+/* Generic function to add symbols from an object file to the
+   global hash table.  */
 
-static bfd_boolean
-generic_link_add_symbols (bfd *abfd,
-                         struct bfd_link_info *info,
-                         bfd_boolean collect)
+bfd_boolean
+_bfd_generic_link_add_symbols (bfd *abfd, struct bfd_link_info *info)
 {
   bfd_boolean ret;
 
   switch (bfd_get_format (abfd))
     {
     case bfd_object:
-      ret = generic_link_add_object_symbols (abfd, info, collect);
+      ret = generic_link_add_object_symbols (abfd, info);
       break;
     case bfd_archive:
       ret = (_bfd_generic_link_add_archive_symbols
-            (abfd, info,
-             (collect
-              ? generic_link_check_archive_element_collect
-              : generic_link_check_archive_element_no_collect)));
+            (abfd, info, generic_link_check_archive_element));
       break;
     default:
       bfd_set_error (bfd_error_wrong_format);
@@ -895,8 +859,7 @@ generic_link_add_symbols (bfd *abfd,
 
 static bfd_boolean
 generic_link_add_object_symbols (bfd *abfd,
-                                struct bfd_link_info *info,
-                                bfd_boolean collect)
+                                struct bfd_link_info *info)
 {
   bfd_size_type symcount;
   struct bfd_symbol **outsyms;
@@ -905,7 +868,7 @@ generic_link_add_object_symbols (bfd *abfd,
     return FALSE;
   symcount = _bfd_generic_link_get_symcount (abfd);
   outsyms = _bfd_generic_link_get_symbols (abfd);
-  return generic_link_add_symbol_list (abfd, info, symcount, outsyms, collect);
+  return generic_link_add_symbol_list (abfd, info, symcount, outsyms);
 }
 \f
 /* Generic function to add symbols from an archive file to the global
@@ -1044,47 +1007,14 @@ _bfd_generic_link_add_archive_symbols
   return FALSE;
 }
 \f
-/* See if we should include an archive element.  This version is used
-   when we do not want to automatically collect constructors based on
-   the symbol name, presumably because we have some other mechanism
-   for finding them.  */
-
-static bfd_boolean
-generic_link_check_archive_element_no_collect (bfd *abfd,
-                                              struct bfd_link_info *info,
-                                              struct bfd_link_hash_entry *h,
-                                              const char *name,
-                                              bfd_boolean *pneeded)
-{
-  return generic_link_check_archive_element (abfd, info, h, name, pneeded,
-                                            FALSE);
-}
-
-/* See if we should include an archive element.  This version is used
-   when we want to automatically collect constructors based on the
-   symbol name, as collect2 does.  */
-
-static bfd_boolean
-generic_link_check_archive_element_collect (bfd *abfd,
-                                           struct bfd_link_info *info,
-                                           struct bfd_link_hash_entry *h,
-                                           const char *name,
-                                           bfd_boolean *pneeded)
-{
-  return generic_link_check_archive_element (abfd, info, h, name, pneeded,
-                                            TRUE);
-}
-
-/* See if we should include an archive element.  Optionally collect
-   constructors.  */
+/* See if we should include an archive element.  */
 
 static bfd_boolean
 generic_link_check_archive_element (bfd *abfd,
                                    struct bfd_link_info *info,
                                    struct bfd_link_hash_entry *h,
                                    const char *name ATTRIBUTE_UNUSED,
-                                   bfd_boolean *pneeded,
-                                   bfd_boolean collect)
+                                   bfd_boolean *pneeded)
 {
   asymbol **pp, **ppend;
 
@@ -1134,7 +1064,7 @@ generic_link_check_archive_element (bfd *abfd,
            return FALSE;
          /* Potentially, the add_archive_element hook may have set a
             substitute BFD for us.  */
-         return generic_link_add_object_symbols (abfd, info, collect);
+         return bfd_link_add_symbols (abfd, info);
        }
 
       /* P is a common symbol.  */
@@ -1192,16 +1122,13 @@ generic_link_check_archive_element (bfd *abfd,
 
 /* Add the symbols from an object file to the global hash table.  ABFD
    is the object file.  INFO is the linker information.  SYMBOL_COUNT
-   is the number of symbols.  SYMBOLS is the list of symbols.  COLLECT
-   is TRUE if constructors should be automatically collected by name
-   as is done by collect2.  */
+   is the number of symbols.  SYMBOLS is the list of symbols.  */
 
 static bfd_boolean
 generic_link_add_symbol_list (bfd *abfd,
                              struct bfd_link_info *info,
                              bfd_size_type symbol_count,
-                             asymbol **symbols,
-                             bfd_boolean collect)
+                             asymbol **symbols)
 {
   asymbol **pp, **ppend;
 
@@ -1247,7 +1174,7 @@ generic_link_add_symbol_list (bfd *abfd,
          bh = NULL;
          if (! (_bfd_generic_link_add_one_symbol
                 (info, abfd, name, p->flags, bfd_get_section (p),
-                 p->value, string, FALSE, collect, &bh)))
+                 p->value, string, FALSE, FALSE, &bh)))
            return FALSE;
          h = (struct generic_link_hash_entry *) bh;
 
@@ -1442,13 +1369,23 @@ _bfd_generic_link_add_one_symbol (struct bfd_link_info *info,
 {
   enum link_row row;
   struct bfd_link_hash_entry *h;
+  struct bfd_link_hash_entry *inh = NULL;
   bfd_boolean cycle;
 
   BFD_ASSERT (section != NULL);
 
   if (bfd_is_ind_section (section)
       || (flags & BSF_INDIRECT) != 0)
-    row = INDR_ROW;
+    {
+      row = INDR_ROW;
+      /* Create the indirect symbol here.  This is for the benefit of
+        the plugin "notice" function.
+        STRING is the name of the symbol we want to indirect to.  */
+      inh = bfd_wrapped_link_hash_lookup (abfd, info, string, TRUE,
+                                         copy, FALSE);
+      if (inh == NULL)
+       return FALSE;
+    }
   else if ((flags & BSF_WARNING) != 0)
     row = WARN_ROW;
   else if ((flags & BSF_CONSTRUCTOR) != 0)
@@ -1465,10 +1402,12 @@ _bfd_generic_link_add_one_symbol (struct bfd_link_info *info,
   else if (bfd_is_com_section (section))
     {
       row = COMMON_ROW;
-      if (strcmp (name, "__gnu_lto_slim") == 0)
-       (*_bfd_error_handler)
-         (_("%s: plugin needed to handle lto object"),
-          bfd_get_filename (abfd));
+      if (!bfd_link_relocatable (info)
+         && name[0] == '_'
+         && name[1] == '_'
+         && strcmp (name + (name[2] == '_'), "__gnu_lto_slim") == 0)
+       _bfd_error_handler
+         (_("%B: plugin needed to handle lto object"), abfd);
     }
   else
     row = DEF_ROW;
@@ -1493,8 +1432,8 @@ _bfd_generic_link_add_one_symbol (struct bfd_link_info *info,
       || (info->notice_hash != NULL
          && bfd_hash_lookup (info->notice_hash, name, FALSE, FALSE) != NULL))
     {
-      if (! (*info->callbacks->notice) (info, h,
-                                       abfd, section, value, flags, string))
+      if (! (*info->callbacks->notice) (info, h, inh,
+                                       abfd, section, value, flags))
        return FALSE;
     }
 
@@ -1504,9 +1443,14 @@ _bfd_generic_link_add_one_symbol (struct bfd_link_info *info,
   do
     {
       enum link_action action;
+      int prev;
 
+      prev = h->type;
+      /* Treat symbols defined by early linker script pass as undefined.  */
+      if (h->ldscript_def)
+       prev = bfd_link_hash_undefined;
       cycle = FALSE;
-      action = link_action[(int) row][(int) h->type];
+      action = link_action[(int) row][prev];
       switch (action)
        {
        case FAIL:
@@ -1533,9 +1477,8 @@ _bfd_generic_link_add_one_symbol (struct bfd_link_info *info,
          /* We have found a definition for a symbol which was
             previously common.  */
          BFD_ASSERT (h->type == bfd_link_hash_common);
-         if (! ((*info->callbacks->multiple_common)
-                (info, h, abfd, bfd_link_hash_defined, 0)))
-           return FALSE;
+         (*info->callbacks->multiple_common) (info, h, abfd,
+                                              bfd_link_hash_defined, 0);
          /* Fall through.  */
        case DEF:
        case DEFW:
@@ -1550,6 +1493,8 @@ _bfd_generic_link_add_one_symbol (struct bfd_link_info *info,
              h->type = bfd_link_hash_defined;
            h->u.def.section = section;
            h->u.def.value = value;
+           h->linker_def = 0;
+           h->ldscript_def = 0;
 
            /* If we have been asked to, we act like collect2 and
               identify all functions that might be global
@@ -1591,10 +1536,9 @@ _bfd_generic_link_add_one_symbol (struct bfd_link_info *info,
                        if (oldtype == bfd_link_hash_defweak)
                          abort ();
 
-                       if (! ((*info->callbacks->constructor)
-                              (info, c == 'I',
-                               h->root.string, abfd, section, value)))
-                         return FALSE;
+                       (*info->callbacks->constructor) (info, c == 'I',
+                                                        h->root.string, abfd,
+                                                        section, value);
                      }
                  }
              }
@@ -1649,6 +1593,8 @@ _bfd_generic_link_add_one_symbol (struct bfd_link_info *info,
            }
          else
            h->u.c.p->section = section;
+         h->linker_def = 0;
+         h->ldscript_def = 0;
          break;
 
        case REF:
@@ -1662,9 +1608,8 @@ _bfd_generic_link_add_one_symbol (struct bfd_link_info *info,
             already had a common definition.  Use the maximum of the
             two sizes, and use the section required by the larger symbol.  */
          BFD_ASSERT (h->type == bfd_link_hash_common);
-         if (! ((*info->callbacks->multiple_common)
-                (info, h, abfd, bfd_link_hash_common, value)))
-           return FALSE;
+         (*info->callbacks->multiple_common) (info, h, abfd,
+                                              bfd_link_hash_common, value);
          if (value > h->u.c.size)
            {
              unsigned int power;
@@ -1702,9 +1647,8 @@ _bfd_generic_link_add_one_symbol (struct bfd_link_info *info,
        case CREF:
          /* We have found a common definition for a symbol which
             was already defined.  */
-         if (! ((*info->callbacks->multiple_common)
-                (info, h, abfd, bfd_link_hash_common, value)))
-           return FALSE;
+         (*info->callbacks->multiple_common) (info, h, abfd,
+                                              bfd_link_hash_common, value);
          break;
 
        case MIND:
@@ -1715,64 +1659,58 @@ _bfd_generic_link_add_one_symbol (struct bfd_link_info *info,
          /* Fall through.  */
        case MDEF:
          /* Handle a multiple definition.  */
-         if (! ((*info->callbacks->multiple_definition)
-                (info, h, abfd, section, value)))
-           return FALSE;
+         (*info->callbacks->multiple_definition) (info, h,
+                                                  abfd, section, value);
          break;
 
        case CIND:
          /* Create an indirect symbol from an existing common symbol.  */
          BFD_ASSERT (h->type == bfd_link_hash_common);
-         if (! ((*info->callbacks->multiple_common)
-                (info, h, abfd, bfd_link_hash_indirect, 0)))
-           return FALSE;
+         (*info->callbacks->multiple_common) (info, h, abfd,
+                                              bfd_link_hash_indirect, 0);
          /* Fall through.  */
        case IND:
-         /* Create an indirect symbol.  */
-         {
-           struct bfd_link_hash_entry *inh;
-
-           /* STRING is the name of the symbol we want to indirect
-              to.  */
-           inh = bfd_wrapped_link_hash_lookup (abfd, info, string, TRUE,
-                                               copy, FALSE);
-           if (inh == NULL)
+         if (inh->type == bfd_link_hash_indirect
+             && inh->u.i.link == h)
+           {
+             _bfd_error_handler
+               /* xgettext:c-format */
+               (_("%B: indirect symbol `%s' to `%s' is a loop"),
+                abfd, name, string);
+             bfd_set_error (bfd_error_invalid_operation);
              return FALSE;
-           if (inh->type == bfd_link_hash_indirect
-               && inh->u.i.link == h)
-             {
-               (*_bfd_error_handler)
-                 (_("%B: indirect symbol `%s' to `%s' is a loop"),
-                  abfd, name, string);
-               bfd_set_error (bfd_error_invalid_operation);
-               return FALSE;
-             }
-           if (inh->type == bfd_link_hash_new)
-             {
-               inh->type = bfd_link_hash_undefined;
-               inh->u.undef.abfd = abfd;
-               bfd_link_add_undef (info->hash, inh);
-             }
+           }
+         if (inh->type == bfd_link_hash_new)
+           {
+             inh->type = bfd_link_hash_undefined;
+             inh->u.undef.abfd = abfd;
+             bfd_link_add_undef (info->hash, inh);
+           }
 
-           /* If the indirect symbol has been referenced, we need to
-              push the reference down to the symbol we are
-              referencing.  */
-           if (h->type != bfd_link_hash_new)
-             {
-               row = UNDEF_ROW;
-               cycle = TRUE;
-             }
+         /* If the indirect symbol has been referenced, we need to
+            push the reference down to the symbol we are referencing.  */
+         if (h->type != bfd_link_hash_new)
+           {
+             /* ??? If inh->type == bfd_link_hash_undefweak this
+                converts inh to bfd_link_hash_undefined.  */
+             row = UNDEF_ROW;
+             cycle = TRUE;
+           }
 
-           h->type = bfd_link_hash_indirect;
-           h->u.i.link = inh;
-         }
+         h->type = bfd_link_hash_indirect;
+         h->u.i.link = inh;
+         /* Not setting h = h->u.i.link here means that when cycle is
+            set above we'll always go to REFC, and then cycle again
+            to the indirected symbol.  This means that any successful
+            change of an existing symbol to indirect counts as a
+            reference.  ??? That may not be correct when the existing
+            symbol was defweak.  */
          break;
 
        case SET:
          /* Add an entry to a set.  */
-         if (! (*info->callbacks->add_to_set) (info, h, BFD_RELOC_CTOR,
-                                               abfd, section, value))
-           return FALSE;
+         (*info->callbacks->add_to_set) (info, h, BFD_RELOC_CTOR,
+                                         abfd, section, value);
          break;
 
        case WARNC:
@@ -1781,10 +1719,8 @@ _bfd_generic_link_add_one_symbol (struct bfd_link_info *info,
          if (h->u.i.warning != NULL
              && (abfd->flags & BFD_PLUGIN) == 0)
            {
-             if (! (*info->callbacks->warning) (info, h->u.i.warning,
-                                                h->root.string, abfd,
-                                                NULL, 0))
-               return FALSE;
+             (*info->callbacks->warning) (info, h->u.i.warning,
+                                          h->root.string, abfd, NULL, 0);
              /* Only issue a warning once.  */
              h->u.i.warning = NULL;
            }
@@ -1806,11 +1742,13 @@ _bfd_generic_link_add_one_symbol (struct bfd_link_info *info,
        case WARN:
          /* Warn if this symbol has been referenced already from non-IR,
             otherwise add a warning.  */
-         if (h->non_ir_ref)
+         if ((!info->lto_plugin_active
+              && (h->u.undef.next != NULL || info->hash->undefs_tail == h))
+             || h->non_ir_ref_regular
+             || h->non_ir_ref_dynamic)
            {
-             if (! (*info->callbacks->warning) (info, string, h->root.string,
-                                                hash_entry_bfd (h), NULL, 0))
-               return FALSE;
+             (*info->callbacks->warning) (info, string, h->root.string,
+                                          hash_entry_bfd (h), NULL, 0);
              break;
            }
          /* Fall through.  */
@@ -1896,7 +1834,7 @@ _bfd_generic_final_link (bfd *abfd, struct bfd_link_info *info)
   if (! generic_add_output_symbol (abfd, &outsymalloc, NULL))
     return FALSE;
 
-  if (info->relocatable)
+  if (bfd_link_relocatable (info))
     {
       /* Allocate space for the output relocs for each section.  */
       for (o = abfd->sections; o != NULL; o = o->next)
@@ -2126,7 +2064,7 @@ _bfd_generic_link_output_symbols (bfd *output_bfd,
                  /* fall through */
                case bfd_link_hash_defined:
                  sym->flags |= BSF_GLOBAL;
-                 sym->flags &=~ BSF_CONSTRUCTOR;
+                 sym->flags &=~ (BSF_WEAK | BSF_CONSTRUCTOR);
                  sym->value = h->root.u.def.value;
                  sym->section = h->root.u.def.section;
                  break;
@@ -2162,7 +2100,7 @@ _bfd_generic_link_output_symbols (bfd *output_bfd,
              && bfd_hash_lookup (info->keep_hash, bfd_asymbol_name (sym),
                                  FALSE, FALSE) == NULL))
        output = FALSE;
-      else if ((sym->flags & (BSF_GLOBAL | BSF_WEAK)) != 0)
+      else if ((sym->flags & (BSF_GLOBAL | BSF_WEAK | BSF_GNU_UNIQUE)) != 0)
        {
          /* If this symbol is marked as occurring now, rather
             than at the end, output it now.  This is used for
@@ -2200,7 +2138,7 @@ _bfd_generic_link_output_symbols (bfd *output_bfd,
                  break;
                case discard_sec_merge:
                  output = TRUE;
-                 if (info->relocatable
+                 if (bfd_link_relocatable (info)
                      || ! (sym->section->flags & SEC_MERGE))
                    break;
                  /* FALLTHROUGH */
@@ -2370,7 +2308,7 @@ _bfd_generic_reloc_link_order (bfd *abfd,
 {
   arelent *r;
 
-  if (! info->relocatable)
+  if (! bfd_link_relocatable (info))
     abort ();
   if (sec->orelocation == NULL)
     abort ();
@@ -2401,9 +2339,8 @@ _bfd_generic_reloc_link_order (bfd *abfd,
       if (h == NULL
          || ! h->written)
        {
-         if (! ((*info->callbacks->unattached_reloc)
-                (info, link_order->u.reloc.p->u.name, NULL, NULL, 0)))
-           return FALSE;
+         (*info->callbacks->unattached_reloc)
+           (info, link_order->u.reloc.p->u.name, NULL, NULL, 0);
          bfd_set_error (bfd_error_bad_value);
          return FALSE;
        }
@@ -2424,7 +2361,7 @@ _bfd_generic_reloc_link_order (bfd *abfd,
 
       size = bfd_get_reloc_size (r->howto);
       buf = (bfd_byte *) bfd_zmalloc (size);
-      if (buf == NULL)
+      if (buf == NULL && size != 0)
        return FALSE;
       rstat = _bfd_relocate_contents (r->howto, abfd,
                                      (bfd_vma) link_order->u.reloc.p->addend,
@@ -2437,17 +2374,13 @@ _bfd_generic_reloc_link_order (bfd *abfd,
        case bfd_reloc_outofrange:
          abort ();
        case bfd_reloc_overflow:
-         if (! ((*info->callbacks->reloc_overflow)
-                (info, NULL,
-                 (link_order->type == bfd_section_reloc_link_order
-                  ? bfd_section_name (abfd, link_order->u.reloc.p->u.section)
-                  : link_order->u.reloc.p->u.name),
-                 r->howto->name, link_order->u.reloc.p->addend,
-                 NULL, NULL, 0)))
-           {
-             free (buf);
-             return FALSE;
-           }
+         (*info->callbacks->reloc_overflow)
+           (info, NULL,
+            (link_order->type == bfd_section_reloc_link_order
+             ? bfd_section_name (abfd, link_order->u.reloc.p->u.section)
+             : link_order->u.reloc.p->u.name),
+            r->howto->name, link_order->u.reloc.p->addend,
+            NULL, NULL, 0);
          break;
        }
       loc = link_order->offset * bfd_octets_per_byte (abfd);
@@ -2601,7 +2534,7 @@ default_indirect_link_order (bfd *output_bfd,
   BFD_ASSERT (input_section->output_offset == link_order->offset);
   BFD_ASSERT (input_section->size == link_order->size);
 
-  if (info->relocatable
+  if (bfd_link_relocatable (info)
       && input_section->reloc_count > 0
       && output_section->orelocation == NULL)
     {
@@ -2610,7 +2543,8 @@ default_indirect_link_order (bfd *output_bfd,
         because somebody is attempting to link together different
         types of object files.  Handling this case correctly is
         difficult, and sometimes impossible.  */
-      (*_bfd_error_handler)
+      _bfd_error_handler
+       /* xgettext:c-format */
        (_("Attempt to do relocatable link with %s input and %s output"),
         bfd_get_target (input_bfd), bfd_get_target (output_bfd));
       bfd_set_error (bfd_error_wrong_format);
@@ -2695,7 +2629,7 @@ default_indirect_link_order (bfd *output_bfd,
        goto error_return;
       new_contents = (bfd_get_relocated_section_contents
                      (output_bfd, info, link_order, contents,
-                      info->relocatable,
+                      bfd_link_relocatable (info),
                       _bfd_generic_link_get_symbols (input_bfd)));
       if (!new_contents)
        goto error_return;
@@ -2886,7 +2820,7 @@ _bfd_handle_already_linked (asection *sec,
         files over IR because the first pass may contain a
         mix of LTO and normal objects and we must keep the
         first match, be it IR or real.  */
-      if (info->loading_lto_outputs
+      if (sec->owner->lto_output
          && (l->sec->owner->flags & BFD_PLUGIN) != 0)
        {
          l->sec = sec;
@@ -2896,6 +2830,7 @@ _bfd_handle_already_linked (asection *sec,
 
     case SEC_LINK_DUPLICATES_ONE_ONLY:
       info->callbacks->einfo
+       /* xgettext:c-format */
        (_("%B: ignoring duplicate section `%A'\n"),
         sec->owner, sec);
       break;
@@ -2905,6 +2840,7 @@ _bfd_handle_already_linked (asection *sec,
        ;
       else if (sec->size != l->sec->size)
        info->callbacks->einfo
+         /* xgettext:c-format */
          (_("%B: duplicate section `%A' has different size\n"),
           sec->owner, sec);
       break;
@@ -2914,6 +2850,7 @@ _bfd_handle_already_linked (asection *sec,
        ;
       else if (sec->size != l->sec->size)
        info->callbacks->einfo
+         /* xgettext:c-format */
          (_("%B: duplicate section `%A' has different size\n"),
           sec->owner, sec);
       else if (sec->size != 0)
@@ -2922,15 +2859,18 @@ _bfd_handle_already_linked (asection *sec,
 
          if (!bfd_malloc_and_get_section (sec->owner, sec, &sec_contents))
            info->callbacks->einfo
+             /* xgettext:c-format */
              (_("%B: could not read contents of section `%A'\n"),
               sec->owner, sec);
          else if (!bfd_malloc_and_get_section (l->sec->owner, l->sec,
                                                &l_sec_contents))
            info->callbacks->einfo
+             /* xgettext:c-format */
              (_("%B: could not read contents of section `%A'\n"),
               l->sec->owner, l->sec);
          else if (memcmp (sec_contents, l_sec_contents, sec->size) != 0)
            info->callbacks->einfo
+             /* xgettext:c-format */
              (_("%B: duplicate section `%A' has different contents\n"),
               sec->owner, sec);
 
@@ -3164,6 +3104,43 @@ bfd_generic_define_common_symbol (bfd *output_bfd,
   return TRUE;
 }
 
+/*
+FUNCTION
+       bfd_generic_define_start_stop
+
+SYNOPSIS
+       struct bfd_link_hash_entry *bfd_generic_define_start_stop
+         (struct bfd_link_info *info,
+          const char *symbol, asection *sec);
+
+DESCRIPTION
+       Define a __start, __stop, .startof. or .sizeof. symbol.
+       Return the symbol or NULL if no such undefined symbol exists.
+
+.#define bfd_define_start_stop(output_bfd, info, symbol, sec) \
+.       BFD_SEND (output_bfd, _bfd_define_start_stop, (info, symbol, sec))
+.
+*/
+
+struct bfd_link_hash_entry *
+bfd_generic_define_start_stop (struct bfd_link_info *info,
+                              const char *symbol, asection *sec)
+{
+  struct bfd_link_hash_entry *h;
+
+  h = bfd_link_hash_lookup (info->hash, symbol, FALSE, FALSE, TRUE);
+  if (h != NULL
+      && (h->type == bfd_link_hash_undefined
+         || h->type == bfd_link_hash_undefweak))
+    {
+      h->type = bfd_link_hash_defined;
+      h->u.def.section = sec;
+      h->u.def.value = 0;
+      return h;
+    }
+  return NULL;
+}
+
 /*
 FUNCTION
        bfd_find_version_for_sym
@@ -3293,3 +3270,103 @@ bfd_hide_sym_by_version (struct bfd_elf_version_tree *verdefs,
   bfd_find_version_for_sym (verdefs, sym_name, &hidden);
   return hidden;
 }
+
+/*
+FUNCTION
+       bfd_link_check_relocs
+
+SYNOPSIS
+       bfd_boolean bfd_link_check_relocs
+         (bfd *abfd, struct bfd_link_info *info);
+
+DESCRIPTION
+       Checks the relocs in ABFD for validity.
+       Does not execute the relocs.
+       Return TRUE if everything is OK, FALSE otherwise.
+       This is the external entry point to this code.
+*/
+
+bfd_boolean
+bfd_link_check_relocs (bfd *abfd, struct bfd_link_info *info)
+{
+  return BFD_SEND (abfd, _bfd_link_check_relocs, (abfd, info));
+}
+
+/*
+FUNCTION
+       _bfd_generic_link_check_relocs
+
+SYNOPSIS
+       bfd_boolean _bfd_generic_link_check_relocs
+         (bfd *abfd, struct bfd_link_info *info);
+
+DESCRIPTION
+        Stub function for targets that do not implement reloc checking.
+       Return TRUE.
+       This is an internal function.  It should not be called from
+       outside the BFD library.
+*/
+
+bfd_boolean
+_bfd_generic_link_check_relocs (bfd *abfd ATTRIBUTE_UNUSED,
+                               struct bfd_link_info *info ATTRIBUTE_UNUSED)
+{
+  return TRUE;
+}
+
+/*
+FUNCTION
+       bfd_merge_private_bfd_data
+
+SYNOPSIS
+       bfd_boolean bfd_merge_private_bfd_data
+         (bfd *ibfd, struct bfd_link_info *info);
+
+DESCRIPTION
+       Merge private BFD information from the BFD @var{ibfd} to the
+       the output file BFD when linking.  Return <<TRUE>> on success,
+       <<FALSE>> on error.  Possible error returns are:
+
+       o <<bfd_error_no_memory>> -
+       Not enough memory exists to create private data for @var{obfd}.
+
+.#define bfd_merge_private_bfd_data(ibfd, info) \
+.     BFD_SEND ((info)->output_bfd, _bfd_merge_private_bfd_data, \
+.              (ibfd, info))
+*/
+
+/*
+INTERNAL_FUNCTION
+       _bfd_generic_verify_endian_match
+
+SYNOPSIS
+       bfd_boolean _bfd_generic_verify_endian_match
+         (bfd *ibfd, struct bfd_link_info *info);
+
+DESCRIPTION
+       Can be used from / for bfd_merge_private_bfd_data to check that
+       endianness matches between input and output file.  Returns
+       TRUE for a match, otherwise returns FALSE and emits an error.
+*/
+
+bfd_boolean
+_bfd_generic_verify_endian_match (bfd *ibfd, struct bfd_link_info *info)
+{
+  bfd *obfd = info->output_bfd;
+
+  if (ibfd->xvec->byteorder != obfd->xvec->byteorder
+      && ibfd->xvec->byteorder != BFD_ENDIAN_UNKNOWN
+      && obfd->xvec->byteorder != BFD_ENDIAN_UNKNOWN)
+    {
+      if (bfd_big_endian (ibfd))
+       _bfd_error_handler (_("%B: compiled for a big endian system "
+                             "and target is little endian"), ibfd);
+      else
+       _bfd_error_handler (_("%B: compiled for a little endian system "
+                             "and target is big endian"), ibfd);
+      bfd_set_error (bfd_error_wrong_format);
+      return FALSE;
+    }
+
+  return TRUE;
+}
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