buildroot/package/binutils/binutils-2.20/400-arm_link_speed.patch

From Binutils CVS:

http://sourceware.org/cgi-bin/cvsweb.cgi/src/bfd/elf32-arm.c?rev=1.230&content-type=text/x-cvsweb-markup&cvsroot=src

Improves linking time from large projects on ARM.
diff -dupr binutils-2.20.orig/bfd/elf32-arm.c binutils-2.20/bfd/elf32-arm.c
--- binutils-2.20.orig/bfd/elf32-arm.c	2010-04-19 10:08:50.000000000 -0700
+++ binutils-2.20/bfd/elf32-arm.c	2010-04-19 10:12:45.000000000 -0700
@@ -12736,108 +12736,15 @@ elf32_arm_section_from_shdr (bfd *abfd,
   return TRUE;
 }

-/* A structure used to record a list of sections, independently
-   of the next and prev fields in the asection structure.  */
-typedef struct section_list
-{
-  asection * sec;
-  struct section_list * next;
-  struct section_list * prev;
-}
-section_list;
-
-/* Unfortunately we need to keep a list of sections for which
-   an _arm_elf_section_data structure has been allocated.  This
-   is because it is possible for functions like elf32_arm_write_section
-   to be called on a section which has had an elf_data_structure
-   allocated for it (and so the used_by_bfd field is valid) but
-   for which the ARM extended version of this structure - the
-   _arm_elf_section_data structure - has not been allocated.  */
-static section_list * sections_with_arm_elf_section_data = NULL;
-
-static void
-record_section_with_arm_elf_section_data (asection * sec)
-{
-  struct section_list * entry;
-
-  entry = bfd_malloc (sizeof (* entry));
-  if (entry == NULL)
-    return;
-  entry->sec = sec;
-  entry->next = sections_with_arm_elf_section_data;
-  entry->prev = NULL;
-  if (entry->next != NULL)
-    entry->next->prev = entry;
-  sections_with_arm_elf_section_data = entry;
-}
-
-static struct section_list *
-find_arm_elf_section_entry (asection * sec)
-{
-  struct section_list * entry;
-  static struct section_list * last_entry = NULL;
-
-  /* This is a short cut for the typical case where the sections are added
-     to the sections_with_arm_elf_section_data list in forward order and
-     then looked up here in backwards order.  This makes a real difference
-     to the ld-srec/sec64k.exp linker test.  */
-  entry = sections_with_arm_elf_section_data;
-  if (last_entry != NULL)
-    {
-      if (last_entry->sec == sec)
-	entry = last_entry;
-      else if (last_entry->next != NULL
-	       && last_entry->next->sec == sec)
-	entry = last_entry->next;
-    }
-
-  for (; entry; entry = entry->next)
-    if (entry->sec == sec)
-      break;
-
-  if (entry)
-    /* Record the entry prior to this one - it is the entry we are most
-       likely to want to locate next time.  Also this way if we have been
-       called from unrecord_section_with_arm_elf_section_data() we will not
-       be caching a pointer that is about to be freed.  */
-    last_entry = entry->prev;
-
-  return entry;
-}
-
 static _arm_elf_section_data *
 get_arm_elf_section_data (asection * sec)
 {
-  struct section_list * entry;
-
-  entry = find_arm_elf_section_entry (sec);
-
-  if (entry)
-    return elf32_arm_section_data (entry->sec);
+  if (sec && sec->owner && is_arm_elf (sec->owner))
+    return elf32_arm_section_data (sec);
   else
     return NULL;
 }

-static void
-unrecord_section_with_arm_elf_section_data (asection * sec)
-{
-  struct section_list * entry;
-
-  entry = find_arm_elf_section_entry (sec);
-
-  if (entry)
-    {
-      if (entry->prev != NULL)
-	entry->prev->next = entry->next;
-      if (entry->next != NULL)
-	entry->next->prev = entry->prev;
-      if (entry == sections_with_arm_elf_section_data)
-	sections_with_arm_elf_section_data = entry->next;
-      free (entry);
-    }
-}
-
-
 typedef struct
 {
   void *finfo;
@@ -13230,8 +13137,6 @@ elf32_arm_new_section_hook (bfd *abfd, a
       sec->used_by_bfd = sdata;
     }

-  record_section_with_arm_elf_section_data (sec);
-
   return _bfd_elf_new_section_hook (abfd, sec);
 }

@@ -13659,44 +13564,13 @@ elf32_arm_write_section (bfd *output_bfd
     }

   free (map);
-  arm_data->mapcount = 0;
+  arm_data->mapcount = -1;
   arm_data->mapsize = 0;
   arm_data->map = NULL;
-  unrecord_section_with_arm_elf_section_data (sec);

   return FALSE;
 }

-static void
-unrecord_section_via_map_over_sections (bfd * abfd ATTRIBUTE_UNUSED,
-					asection * sec,
-					void * ignore ATTRIBUTE_UNUSED)
-{
-  unrecord_section_with_arm_elf_section_data (sec);
-}
-
-static bfd_boolean
-elf32_arm_close_and_cleanup (bfd * abfd)
-{
-  if (abfd->sections)
-    bfd_map_over_sections (abfd,
-			   unrecord_section_via_map_over_sections,
-			   NULL);
-
-  return _bfd_elf_close_and_cleanup (abfd);
-}
-
-static bfd_boolean
-elf32_arm_bfd_free_cached_info (bfd * abfd)
-{
-  if (abfd->sections)
-    bfd_map_over_sections (abfd,
-			   unrecord_section_via_map_over_sections,
-			   NULL);
-
-  return _bfd_free_cached_info (abfd);
-}
-
 /* Display STT_ARM_TFUNC symbols as functions.  */

 static void
@@ -13882,8 +13756,6 @@ const struct elf_size_info elf32_arm_siz
 #define bfd_elf32_find_inliner_info	        elf32_arm_find_inliner_info
 #define bfd_elf32_new_section_hook		elf32_arm_new_section_hook
 #define bfd_elf32_bfd_is_target_special_symbol	elf32_arm_is_target_special_symbol
-#define bfd_elf32_close_and_cleanup             elf32_arm_close_and_cleanup
-#define bfd_elf32_bfd_free_cached_info          elf32_arm_bfd_free_cached_info
 #define bfd_elf32_bfd_final_link		elf32_arm_final_link

 #define elf_backend_get_symbol_type             elf32_arm_get_symbol_type