1 files changed, 92 insertions, 0 deletions
diff --git a/bfd/linker.c b/bfd/linker.c
index bfbd886..66ec2fa 100644
--- a/bfd/linker.c
+++ b/bfd/linker.c
@@ -3245,3 +3245,95 @@ bfd_generic_define_common_symbol (bfd *output_bfd,
   section->flags &= ~SEC_IS_COMMON;
   return TRUE;
 }
+
+/*
+FUNCTION
+	bfd_find_version_for_sym 
+
+SYNOPSIS
+	struct bfd_elf_version_tree * bfd_find_version_for_sym
+	  (struct bfd_elf_version_tree *verdefs,
+	   const char *sym_name, bfd_boolean *hide);
+
+DESCRIPTION
+	Search an elf version script tree for symbol versioning
+	info and export / don't-export status for a given symbol.
+	Return non-NULL on success and NULL on failure; also sets
+	the output @samp{hide} boolean parameter.
+
+*/
+
+struct bfd_elf_version_tree *
+bfd_find_version_for_sym (struct bfd_elf_version_tree *verdefs,
+		      const char *sym_name,
+		      bfd_boolean *hide)
+{
+  struct bfd_elf_version_tree *t;
+  struct bfd_elf_version_tree *local_ver, *global_ver, *exist_ver;
+
+  local_ver = NULL;
+  global_ver = NULL;
+  exist_ver = NULL;
+  for (t = verdefs; t != NULL; t = t->next)
+    {
+      if (t->globals.list != NULL)
+	{
+	  struct bfd_elf_version_expr *d = NULL;
+
+	  while ((d = (*t->match) (&t->globals, d, sym_name)) != NULL)
+	    {
+	      global_ver = t;
+	      if (d->symver)
+		exist_ver = t;
+	      d->script = 1;
+	      /* If the match is a wildcard pattern, keep looking for
+		 a more explicit, perhaps even local, match.  */
+	      if (d->literal)
+		break;
+	    }
+
+	  if (d != NULL)
+	    break;
+	}
+
+      if (t->locals.list != NULL)
+	{
+	  struct bfd_elf_version_expr *d = NULL;
+
+	  while ((d = (*t->match) (&t->locals, d, sym_name)) != NULL)
+	    {
+	      local_ver = t;
+	      /* If the match is a wildcard pattern, keep looking for
+		 a more explicit, perhaps even global, match.  */
+	      if (d->literal)
+		{
+		  /* An exact match overrides a global wildcard.  */
+		  global_ver = NULL;
+		  break;
+		}
+	    }
+
+	  if (d != NULL)
+	    break;
+	}
+    }
+
+  if (global_ver != NULL)
+    {
+      /* If we already have a versioned symbol that matches the
+	 node for this symbol, then we don't want to create a
+	 duplicate from the unversioned symbol.  Instead hide the
+	 unversioned symbol.  */
+      *hide = exist_ver == global_ver;
+      return global_ver;
+    }
+
+  if (local_ver != NULL)
+    {
+      *hide = TRUE;
+      return local_ver;
+    }
+
+  return NULL;
+}
+