ia64: Check UNDEFWEAK_NO_DYNAMIC_RELOC

Don't generate dynamic relocation against weak undefined symbol if it
is resolved to zero.  FIXME: UNDEFWEAK_NO_DYNAMIC_RELOC may need to be
checked in more places.

	PR ld/22269
	* elfnn-ia64.c (elfNN_ia64_check_relocs): Don't allocate
	dynamic relocation if UNDEFWEAK_NO_DYNAMIC_RELOC is true.
	(allocate_fptr): Don't allocate function pointer if
	UNDEFWEAK_NO_DYNAMIC_RELOC is true.
	(allocate_dynrel_entries): Don't allocate dynamic relocation
	if UNDEFWEAK_NO_DYNAMIC_RELOC is true.
	(set_got_entry): Don't set GOT entry if
	UNDEFWEAK_NO_DYNAMIC_RELOC is true.
	(set_pltoff_entry): Don't set PLTOFF entry if
	UNDEFWEAK_NO_DYNAMIC_RELOC is true.
	(elfNN_ia64_relocate_section): Don't install dynamic relocation
	UNDEFWEAK_NO_DYNAMIC_RELOC is true.

2 files changed, 31 insertions, 5 deletions

diff --git a/bfd/ChangeLog b/bfd/ChangeLog
index 900c411..3011aa2 100644
--- a/bfd/ChangeLog
+++ b/bfd/ChangeLog
@@ -1,6 +1,22 @@
 2017-10-14  H.J. Lu  <hongjiu.lu@intel.com>
 
 	PR ld/22269
+	* elfnn-ia64.c (elfNN_ia64_check_relocs): Don't allocate
+	dynamic relocation if UNDEFWEAK_NO_DYNAMIC_RELOC is true.
+	(allocate_fptr): Don't allocate function pointer if
+	UNDEFWEAK_NO_DYNAMIC_RELOC is true.
+	(allocate_dynrel_entries): Don't allocate dynamic relocation
+	if UNDEFWEAK_NO_DYNAMIC_RELOC is true.
+	(set_got_entry): Don't set GOT entry if
+	UNDEFWEAK_NO_DYNAMIC_RELOC is true.
+	(set_pltoff_entry): Don't set PLTOFF entry if
+	UNDEFWEAK_NO_DYNAMIC_RELOC is true.
+	(elfNN_ia64_relocate_section): Don't install dynamic relocation
+	UNDEFWEAK_NO_DYNAMIC_RELOC is true.
+
+2017-10-14  H.J. Lu  <hongjiu.lu@intel.com>
+
+	PR ld/22269
 	* elfxx-mips.c (mips_elf_calculate_relocation): Don't generate
 	dynamic relocation if UNDEFWEAK_NO_DYNAMIC_RELOC is true.
 	(allocate_dynrelocs): Don't allocate dynamic relocations if
diff --git a/bfd/elfnn-ia64.c b/bfd/elfnn-ia64.c
index 2e70db6..8a2f5e3 100644
--- a/bfd/elfnn-ia64.c
+++ b/bfd/elfnn-ia64.c
@@ -2190,6 +2190,9 @@ elfNN_ia64_check_relocs (bfd *abfd, struct bfd_link_info *info,
       else
 	h = NULL;
 
+      if (h && UNDEFWEAK_NO_DYNAMIC_RELOC (info, h))
+	continue;
+
       /* We can only get preliminary data on whether a symbol is
 	 locally or externally defined, as not all of the input files
 	 have yet been processed.  Do something with what we know, as
@@ -2365,6 +2368,9 @@ elfNN_ia64_check_relocs (bfd *abfd, struct bfd_link_info *info,
       else
 	h = NULL;
 
+      if (h && UNDEFWEAK_NO_DYNAMIC_RELOC (info, h))
+	continue;
+
       /* We can only get preliminary data on whether a symbol is
 	 locally or externally defined, as not all of the input files
 	 have yet been processed.  Do something with what we know, as
@@ -2717,7 +2723,8 @@ allocate_fptr (struct elfNN_ia64_dyn_sym_info *dyn_i, void * data)
 
       if (!bfd_link_executable (x->info)
 	  && (!h
-	      || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
+	      || (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
+		  && !UNDEFWEAK_NO_DYNAMIC_RELOC (x->info, h))
 	      || (h->root.type != bfd_link_hash_undefweak
 		  && h->root.type != bfd_link_hash_undefined)))
 	{
@@ -2846,8 +2853,8 @@ allocate_dynrel_entries (struct elfNN_ia64_dyn_sym_info *dyn_i,
 
   shared = bfd_link_pic (x->info);
   resolved_zero = (dyn_i->h
-		   && ELF_ST_VISIBILITY (dyn_i->h->other)
-		   && dyn_i->h->root.type == bfd_link_hash_undefweak);
+		   && UNDEFWEAK_NO_DYNAMIC_RELOC (x->info,
+						       dyn_i->h));
 
   /* Take care of the GOT and PLT relocations.  */
 
@@ -3319,7 +3326,8 @@ set_got_entry (bfd *abfd, struct bfd_link_info *info,
       /* Install a dynamic relocation if needed.  */
       if (((bfd_link_pic (info)
 	    && (!dyn_i->h
-		|| ELF_ST_VISIBILITY (dyn_i->h->other) == STV_DEFAULT
+		|| (ELF_ST_VISIBILITY (dyn_i->h->other) == STV_DEFAULT
+		    && !UNDEFWEAK_NO_DYNAMIC_RELOC (info, dyn_i->h))
 		|| dyn_i->h->root.type != bfd_link_hash_undefweak)
 	    && dyn_r_type != R_IA64_DTPREL32LSB
 	    && dyn_r_type != R_IA64_DTPREL64LSB)
@@ -3483,7 +3491,8 @@ set_pltoff_entry (bfd *abfd, struct bfd_link_info *info,
       if (!is_plt
 	  && bfd_link_pic (info)
 	  && (!dyn_i->h
-	      || ELF_ST_VISIBILITY (dyn_i->h->other) == STV_DEFAULT
+	      || (ELF_ST_VISIBILITY (dyn_i->h->other) == STV_DEFAULT
+		  && !UNDEFWEAK_NO_DYNAMIC_RELOC (info, dyn_i->h))
 	      || dyn_i->h->root.type != bfd_link_hash_undefweak))
 	{
 	  unsigned int dyn_r_type;
@@ -3944,6 +3953,7 @@ elfNN_ia64_relocate_section (bfd *output_bfd,
 	case R_IA64_DIR64LSB:
 	  /* Install a dynamic relocation for this reloc.  */
 	  if ((dynamic_symbol_p || bfd_link_pic (info))
+	      && !(h && UNDEFWEAK_NO_DYNAMIC_RELOC (info, h))
 	      && r_symndx != STN_UNDEF
 	      && (input_section->flags & SEC_ALLOC) != 0)
 	    {