bfd/

2003-06-17  H.J. Lu <hongjiu.lu@intel.com>

	* section.c (struct sec): Put back kept_section.
	(STD_SECTION): Put back kept_section initialization.
	* bfd-in2.h: Regenerate.

	* elflink.h (elf_link_input_bfd): Also check discarded linkonce
	sections for relocateable output. Use kept_section to preserve
	debug information discarded by linkonce.

ld/

2003-06-17  H.J. Lu <hongjiu.lu@intel.com>

	* ldlang.c (section_already_linked): Put back assignment of
	kept_section.

4 files changed, 47 insertions, 11 deletions

diff --git a/bfd/ChangeLog b/bfd/ChangeLog
index f799d2e..f0570bb 100644
--- a/bfd/ChangeLog
+++ b/bfd/ChangeLog
@@ -1,3 +1,13 @@
+2003-06-17  H.J. Lu <hongjiu.lu@intel.com>
+
+	* section.c (struct sec): Put back kept_section.
+	(STD_SECTION): Put back kept_section initialization.
+	* bfd-in2.h: Regenerate.
+
+	* elflink.h (elf_link_input_bfd): Also check discarded linkonce
+	sections for relocateable output. Use kept_section to preserve
+	debug information discarded by linkonce.
+
 2003-06-17  Roland McGrath  <roland@redhat.com>
 
 	* elfxx-ia64.c (elfNN_ia64_relocate_section): Support
diff --git a/bfd/bfd-in2.h b/bfd/bfd-in2.h
index 072812e..71346c1 100644
--- a/bfd/bfd-in2.h
+++ b/bfd/bfd-in2.h
@@ -1408,6 +1408,10 @@ typedef struct sec
   /* Optional information about a COMDAT entry; NULL if not COMDAT.  */
   struct bfd_comdat_info *comdat;
 
+  /* Points to the kept section if this section is a link-once section,
+     and is discarded.  */
+  struct sec *kept_section;
+
   /* When a section is being output, this value changes as more
      linenumbers are written out.  */
   file_ptr moving_line_filepos;
diff --git a/bfd/elflink.h b/bfd/elflink.h
index b960c73..64554e7 100644
--- a/bfd/elflink.h
+++ b/bfd/elflink.h
@@ -5005,9 +5005,9 @@ elf_link_input_bfd (finfo, input_bfd)
 	     from discarded sections and section symbols from
 	     removed link-once sections.  Complain about relocs
 	     against discarded sections.  Zero relocs against removed
-	     link-once sections.  */
-	  if (!finfo->info->relocateable
-	      && !elf_section_ignore_discarded_relocs (o))
+	     link-once sections.  Preserve debug information as much
+	     as we can.  */
+	  if (!elf_section_ignore_discarded_relocs (o))
 	    {
 	      Elf_Internal_Rela *rel, *relend;
 
@@ -5016,6 +5016,7 @@ elf_link_input_bfd (finfo, input_bfd)
 	      for ( ; rel < relend; rel++)
 		{
 		  unsigned long r_symndx = ELF_R_SYM (rel->r_info);
+		  asection *sec;
 
 		  if (r_symndx >= locsymcount
 		      || (elf_bad_symtab (input_bfd)
@@ -5030,14 +5031,22 @@ elf_link_input_bfd (finfo, input_bfd)
 
 		      /* Complain if the definition comes from a
 			 discarded section.  */
+		      sec = h->root.u.def.section;
 		      if ((h->root.type == bfd_link_hash_defined
 			   || h->root.type == bfd_link_hash_defweak)
-			  && elf_discarded_section (h->root.u.def.section))
+			  && elf_discarded_section (sec))
 			{
 			  if ((o->flags & SEC_DEBUGGING) != 0)
 			    {
 			      BFD_ASSERT (r_symndx != 0);
-			      memset (rel, 0, sizeof (*rel));
+			      /* Try to preserve debug information.  */
+			      if ((o->flags & SEC_DEBUGGING) != 0
+				  && sec->kept_section != NULL
+				  && sec->_cooked_size == sec->kept_section->_cooked_size)
+				h->root.u.def.section
+				  = sec->kept_section;
+			      else
+				memset (rel, 0, sizeof (*rel));
 			    }
 			  else
 			    finfo->info->callbacks->error_handler
@@ -5051,7 +5060,7 @@ elf_link_input_bfd (finfo, input_bfd)
 		    }
 		  else
 		    {
-		      asection *sec = finfo->sections[r_symndx];
+		      sec = finfo->sections[r_symndx];
 
 		      if (sec != NULL && elf_discarded_section (sec))
 			{
@@ -5059,9 +5068,18 @@ elf_link_input_bfd (finfo, input_bfd)
 			      || (sec->flags & SEC_LINK_ONCE) != 0)
 			    {
 			      BFD_ASSERT (r_symndx != 0);
-			      rel->r_info
-				= ELF_R_INFO (0, ELF_R_TYPE (rel->r_info));
-			      rel->r_addend = 0;
+			      /* Try to preserve debug information.  */
+			      if ((o->flags & SEC_DEBUGGING) != 0
+				  && sec->kept_section != NULL
+				  && sec->_cooked_size == sec->kept_section->_cooked_size)
+				finfo->sections[r_symndx]
+				  = sec->kept_section;
+			      else
+				{
+				  rel->r_info
+				    = ELF_R_INFO (0, ELF_R_TYPE (rel->r_info));
+				  rel->r_addend = 0;
+				}
 			    }
 			  else
 			    {
diff --git a/bfd/section.c b/bfd/section.c
index 6facfe2..44edb07 100644
--- a/bfd/section.c
+++ b/bfd/section.c
@@ -493,6 +493,10 @@ CODE_FRAGMENT
 .  {* Optional information about a COMDAT entry; NULL if not COMDAT.  *}
 .  struct bfd_comdat_info *comdat;
 .
+.  {* Points to the kept section if this section is a link-once section,
+.     and is discarded.  *}
+.  struct sec *kept_section;
+.
 .  {* When a section is being output, this value changes as more
 .     linenumbers are written out.  *}
 .  file_ptr moving_line_filepos;
@@ -640,8 +644,8 @@ static const asymbol global_syms[] =
     /* line_filepos, userdata, contents, lineno, lineno_count,       */	\
        0,            NULL,     NULL,     NULL,   0,			\
 									\
-    /* entsize, comdat, moving_line_filepos,                         */	\
-       0,       NULL,   0,						\
+    /* entsize, comdat, kept_section, moving_line_filepos,           */	\
+       0,       NULL,   NULL,	      0,				\
 									\
     /* target_index, used_by_bfd, constructor_chain, owner,          */	\
        0,            NULL,        NULL,              NULL,		\