Mention PR ld/4701.

[deliverable/binutils-gdb.git] / bfd / linker.c

diff --git a/bfd/linker.c b/bfd/linker.c
index 14eeae4df0c858d63dcdd4f299951fb39ad2775b..497b5c23556588a223a3ae1e9033b1b70ecfbf53 100644 (file)
--- a/bfd/linker.c
+++ b/bfd/linker.c
@@ -1,6 +1,7 @@
 /* linker.c -- BFD linker routines
    Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
-   2003, 2004, 2005, 2006 Free Software Foundation, Inc.
+   2003, 2004, 2005, 2006, 2007
+   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.
@@ -19,8 +20,8 @@
    along with this program; if not, write to the Free Software
    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
 
-#include "bfd.h"
 #include "sysdep.h"
+#include "bfd.h"
 #include "libbfd.h"
 #include "bfdlink.h"
 #include "genlink.h"
@@ -562,11 +563,11 @@ bfd_wrapped_link_hash_lookup (bfd *abfd,
 
 #undef WRAP
 
-#undef REAL
+#undef  REAL
 #define REAL "__real_"
 
       if (*l == '_'
-         && strncmp (l, REAL, sizeof REAL - 1) == 0
+         && CONST_STRNEQ (l, REAL)
          && bfd_hash_lookup (info->wrap_hash, l + sizeof REAL - 1,
                              FALSE, FALSE) != NULL)
        {
@@ -1659,8 +1660,7 @@ _bfd_generic_link_add_one_symbol (struct bfd_link_info *info,
                s = name + 1;
                while (*s == '_')
                  ++s;
-               if (s[0] == 'G'
-                   && strncmp (s, CONS_PREFIX, CONS_PREFIX_LEN - 1) == 0)
+               if (s[0] == 'G' && CONST_STRNEQ (s, CONS_PREFIX))
                  {
                    char c;
 
@@ -2877,14 +2877,15 @@ FUNCTION
        bfd_section_already_linked
 
 SYNOPSIS
-        void bfd_section_already_linked (bfd *abfd, asection *sec);
+        void bfd_section_already_linked (bfd *abfd, asection *sec,
+                                        struct bfd_link_info *info);
 
 DESCRIPTION
        Check if @var{sec} has been already linked during a reloceatable
        or final link.
 
-.#define bfd_section_already_linked(abfd, sec) \
-.       BFD_SEND (abfd, _section_already_linked, (abfd, sec))
+.#define bfd_section_already_linked(abfd, sec, info) \
+.       BFD_SEND (abfd, _section_already_linked, (abfd, sec, info))
 .
 
 */
@@ -2970,7 +2971,8 @@ bfd_section_already_linked_table_free (void)
 /* This is used on non-ELF inputs.  */
 
 void
-_bfd_generic_section_already_linked (bfd *abfd, asection *sec)
+_bfd_generic_section_already_linked (bfd *abfd, asection *sec,
+                                    struct bfd_link_info *info ATTRIBUTE_UNUSED)
 {
   flagword flags;
   const char *name;
@@ -3074,7 +3076,7 @@ _bfd_generic_section_already_linked (bfd *abfd, asection *sec)
   bfd_section_already_linked_table_insert (already_linked_list, sec);
 }
 
-/* Convert symbols in excluded output sections to absolute.  */
+/* Convert symbols in excluded output sections to use a kept section.  */
 
 static bfd_boolean
 fix_syms (struct bfd_link_hash_entry *h, void *data)
@@ -3093,8 +3095,64 @@ fix_syms (struct bfd_link_hash_entry *h, void *data)
          && (s->output_section->flags & SEC_EXCLUDE) != 0
          && bfd_section_removed_from_list (obfd, s->output_section))
        {
+         asection *op, *op1;
+
          h->u.def.value += s->output_offset + s->output_section->vma;
-         h->u.def.section = bfd_abs_section_ptr;
+
+         /* Find preceding kept section.  */
+         for (op1 = s->output_section->prev; op1 != NULL; op1 = op1->prev)
+           if ((op1->flags & SEC_EXCLUDE) == 0
+               && !bfd_section_removed_from_list (obfd, op1))
+             break;
+
+         /* Find following kept section.  Start at prev->next because
+            other sections may have been added after S was removed.  */
+         if (s->output_section->prev != NULL)
+           op = s->output_section->prev->next;
+         else
+           op = s->output_section->owner->sections;
+         for (; op != NULL; op = op->next)
+           if ((op->flags & SEC_EXCLUDE) == 0
+               && !bfd_section_removed_from_list (obfd, op))
+             break;
+
+         /* Choose better of two sections, based on flags.  The idea
+            is to choose a section that will be in the same segment
+            as S would have been if it was kept.  */
+         if (op1 == NULL)
+           {
+             if (op == NULL)
+               op = bfd_abs_section_ptr;
+           }
+         else if (op == NULL)
+           op = op1;
+         else if (((op1->flags ^ op->flags)
+                   & (SEC_ALLOC | SEC_THREAD_LOCAL)) != 0)
+           {
+             if (((op->flags ^ s->flags)
+                  & (SEC_ALLOC | SEC_THREAD_LOCAL)) != 0)
+               op = op1;
+           }
+         else if (((op1->flags ^ op->flags) & SEC_READONLY) != 0)
+           {
+             if (((op->flags ^ s->flags) & SEC_READONLY) != 0)
+               op = op1;
+           }
+         else if (((op1->flags ^ op->flags) & SEC_CODE) != 0)
+           {
+             if (((op->flags ^ s->flags) & SEC_CODE) != 0)
+               op = op1;
+           }
+         else
+           {
+             /* Flags we care about are the same.  Prefer the following
+                section if that will result in a positive valued sym.  */
+             if (h->u.def.value < op->vma)
+               op = op1;
+           }
+
+         h->u.def.value -= op->vma;
+         h->u.def.section = op;
        }
     }