Don't generate PLT for IFUNC GOT/pointer reference

If a backend supports it, PLT entry isn't needed when all references
to a STT_GNU_IFUNC symbols are done via GOT or static function pointers.
For GOT entries, We generate dynamic R_*_GLOB_DAT relocations for
preemptable symbols and R_*_IRELATIVE relocations for non-preemptable
symbols to update them with real function address.  For static pointer
pointers, we generate dynamic pointer relocations and store them in:

1. .rel[a].ifunc section in PIC object.
2. .rel[a].got section in dynamic executable.
3. .rel[a].iplt section in static executable.

We don't allocate GOT entry if it isn't used.

bfd/

	PR ld/20253
	* elf-bfd.h (_bfd_elf_allocate_ifunc_dyn_relocs): Add an
	bfd_boolean argument.
	* elf-ifunc.c (_bfd_elf_create_ifunc_sections): Replace
	"shared object" with "PIC object" in comments.
	(_bfd_elf_allocate_ifunc_dyn_relocs): Updated.  Replace
	"shared object" with "PIC object" in comments.  Avoid PLT if
	requested.  Generate dynamic relocations for non-GOT references.
	Make room for the special first entry in PLT and allocate PLT
	entry only for PLT and PC-relative references.  Store dynamic
	GOT relocations in .rel[a].iplt section for static executables.
	If PLT isn't used, always use GOT for symbol value.  Don't
	allocate GOT entry if it isn't used.
	* elf32-i386.c (elf_i386_check_relocs): Increment PLT reference
	count only in the code section.  Allocate dynamic pointer
	relocation against STT_GNU_IFUNC symbol in the non-code section.
	(elf_i386_adjust_dynamic_symbol): Increment PLT reference count
	only for PC-relative references.
	(elf_i386_allocate_dynrelocs): Pass TRUE to
	_bfd_elf_allocate_ifunc_dyn_relocs.
	(elf_i386_relocate_section): Allow R_386_GOT32/R_386_GOT32X
	relocations against STT_GNU_IFUNC symbols without PLT.  Generate
	dynamic pointer relocation against STT_GNU_IFUNC symbol in
	the non-code section and store it in the proper REL section.
	Don't allow non-pointer relocation against STT_GNU_IFUNC symbol
	without PLT.
	(elf_i386_finish_dynamic_symbol): Generate dynamic
	R_386_IRELATIVE and R_386_GLOB_DAT GOT relocations against
	STT_GNU_IFUNC symbols without PLT.
	(elf_i386_finish_dynamic_sections): Don't handle local
	STT_GNU_IFUNC symbols here.
	(elf_i386_output_arch_local_syms): Handle local STT_GNU_IFUNC
	symbols here.
	(elf_backend_output_arch_local_syms): New.
	* elf32-x86-64.c (elf_i386_check_relocs): Increment PLT reference
	count only in the code section.  Allocate dynamic pointer
	relocation against STT_GNU_IFUNC symbol in the non-code section.
	(elf_x86_64_adjust_dynamic_symbol): Increment PLT reference
	count only for PC-relative references.
	(elf_x86_64_allocate_dynrelocs): Pass TRUE to
	_bfd_elf_allocate_ifunc_dyn_relocs.
	(elf_x86_64_relocate_section): Allow R_X86_64_GOTPCREL,
	R_X86_64_GOTPCRELX, R_X86_64_REX_GOTPCRELX and
	R_X86_64_GOTPCREL64 relocations against STT_GNU_IFUNC symbols
	without PLT.  Generate dynamic pointer relocation against
	STT_GNU_IFUNC symbol in the non-code section and store it in
	the proper RELA section.  Don't allow non-pointer relocation
	against STT_GNU_IFUNC symbol without PLT.
	(elf_x86_64_finish_dynamic_symbol): Generate dynamic
	R_X86_64_IRELATIVE and R_X86_64_GLOB_DAT GOT relocations against
	STT_GNU_IFUNC symbols without PLT.
	(elf_x86_64_finish_dynamic_sections): Don't handle local
	STT_GNU_IFUNC symbols here.
	(elf_x86_64_output_arch_local_syms): Handle local STT_GNU_IFUNC
	symbols here.
	(elf_backend_output_arch_local_syms): New.
	* elfnn-aarch64.c (elfNN_aarch64_allocate_ifunc_dynrelocs):
	Pass FALSE to _bfd_elf_allocate_ifunc_dyn_relocs.

ld/

	PR ld/20253
	* testsuite/ld-i386/i386.exp: Run PR ld/20253 tests.
	* testsuite/ld-i386/no-plt.exp: Likewise.
	* testsuite/ld-x86-64/no-plt.exp: Likewise.
	* testsuite/ld-i386/pr13302.d: Remove .rel.plt section.
	* testsuite/ld-ifunc/ifunc-13-i386.d: Likewise.
	* testsuite/ld-ifunc/ifunc-13-x86-64.d: Likewise.
	* testsuite/ld-ifunc/ifunc-15-i386.d: Likewise.
	* testsuite/ld-ifunc/ifunc-15-x86-64.d: Likewise.
	* testsuite/ld-x86-64/pr13082-5a.d: Likewise.
	* testsuite/ld-x86-64/pr13082-5b.d: Likewise.
	* testsuite/ld-x86-64/pr13082-6a.d: Likewise.
	* testsuite/ld-x86-64/pr13082-6b.d: Likewise.
	* testsuite/ld-i386/pr20244-2a.d: Remove .plt section.
	* testsuite/ld-ifunc/ifunc-21-i386.d: Likewise.
	* testsuite/ld-ifunc/ifunc-21-x86-64.d: Likewise.
	* testsuite/ld-ifunc/ifunc-22-i386.d: Likewise.
	* testsuite/ld-ifunc/ifunc-22-x86-64.d: Likewise.
	* testsuite/ld-i386/pr20244-2b.d: Updated.
	* testsuite/ld-i386/pr20244-2c.d: Likewise.
	* testsuite/ld-ifunc/ifunc-18a-i386.d: Likewise.
	* testsuite/ld-ifunc/ifunc-18a-x86-64.d: Likewise.
	* testsuite/ld-ifunc/ifunc-18b-i386.d: Likewise.
	* testsuite/ld-ifunc/ifunc-18b-x86-64.d: Likewise.
	* testsuite/ld-i386/pr20253-1a.c: New file.
	* testsuite/ld-i386/pr20253-1b.S: Likewise.
	* testsuite/ld-i386/pr20253-1c.S: Likewise.
	* testsuite/ld-i386/pr20253-1d.S: Likewise.
	* testsuite/ld-i386/pr20253-2a.c: Likewise.
	* testsuite/ld-i386/pr20253-2b.S: Likewise.
	* testsuite/ld-i386/pr20253-2c.S: Likewise.
	* testsuite/ld-i386/pr20253-2d.S: Likewise.
	* testsuite/ld-i386/pr20253-3.d: Likewise.
	* testsuite/ld-i386/pr20253-3.s: Likewise.
	* testsuite/ld-i386/pr20253-4.s: Likewise.
	* testsuite/ld-i386/pr20253-4a.d: Likewise.
	* testsuite/ld-i386/pr20253-4b.d: Likewise.
	* testsuite/ld-i386/pr20253-4c.d: Likewise.
	* testsuite/ld-i386/pr20253-5.d: Likewise.
	* testsuite/ld-i386/pr20253-5.s: Likewise.
	* testsuite/ld-ifunc/ifunc-23-x86.s: Likewise.
	* testsuite/ld-ifunc/ifunc-23a-x86.d: Likewise.
	* testsuite/ld-ifunc/ifunc-23b-x86.d: Likewise.
	* testsuite/ld-ifunc/ifunc-23c-x86.d: Likewise.
	* testsuite/ld-ifunc/ifunc-24-x86.s: Likewise.
	* testsuite/ld-ifunc/ifunc-24a-x86.d: Likewise.
	* testsuite/ld-ifunc/ifunc-24b-x86.d: Likewise.
	* testsuite/ld-ifunc/ifunc-24c-x86.d: Likewise.
	* testsuite/ld-ifunc/ifunc-25-x86.s: Likewise.
	* testsuite/ld-ifunc/ifunc-25a-x86.d: Likewise.
	* testsuite/ld-ifunc/ifunc-25b-x86.d: Likewise.
	* testsuite/ld-ifunc/ifunc-25c-x86.d: Likewise.
	* testsuite/ld-x86-64/pr20253-1.s: Likewise.
	* testsuite/ld-x86-64/pr20253-1a.d: Likewise.
	* testsuite/ld-x86-64/pr20253-1b.d: Likewise.
	* testsuite/ld-x86-64/pr20253-1c.d: Likewise.
	* testsuite/ld-x86-64/pr20253-1d.d: Likewise.
	* testsuite/ld-x86-64/pr20253-1e.d: Likewise.
	* testsuite/ld-x86-64/pr20253-1f.d: Likewise.
	* testsuite/ld-x86-64/pr20253-1g.d: Likewise.
	* testsuite/ld-x86-64/pr20253-1h.d: Likewise.
	* testsuite/ld-x86-64/pr20253-1i.d: Likewise.
	* testsuite/ld-x86-64/pr20253-1j.d: Likewise.
	* testsuite/ld-x86-64/pr20253-1k.d: Likewise.
	* testsuite/ld-x86-64/pr20253-1l.d: Likewise.
	* testsuite/ld-x86-64/pr20253-2a.c: Likewise.
	* testsuite/ld-x86-64/pr20253-2b.S: Likewise.
	* testsuite/ld-x86-64/pr20253-2c.S: Likewise.
	* testsuite/ld-x86-64/pr20253-2d.S: Likewise.
	* testsuite/ld-x86-64/pr20253-3.d: Likewise.
	* testsuite/ld-x86-64/pr20253-3.s: Likewise.
	* testsuite/ld-x86-64/pr20253-4.s: Likewise.
	* testsuite/ld-x86-64/pr20253-4a.d: Likewise.
	* testsuite/ld-x86-64/pr20253-4b.d: Likewise.
	* testsuite/ld-x86-64/pr20253-4c.d: Likewise.
	* testsuite/ld-x86-64/pr20253-4d.d: Likewise.
	* testsuite/ld-x86-64/pr20253-4e.d: Likewise.
	* testsuite/ld-x86-64/pr20253-4f.d: Likewise.
	* testsuite/ld-x86-64/pr20253-5.s: Likewise.
	* testsuite/ld-x86-64/pr20253-5a.d: Likewise.
	* testsuite/ld-x86-64/pr20253-5b.d: Likewise.
	* testsuite/ld-ifunc/ifunc-18a-i386.d: Remove extra IRELATIVE
	relocation.
	* testsuite/ld-ifunc/ifunc-18a-x86-64.d: Likewise.
	* testsuite/ld-ifunc/ifunc-18b-i386.d: Likewise.
	* testsuite/ld-ifunc/ifunc-18b-x86-64.d: Likewise.
	* testsuite/ld-ifunc/ifunc-18a.s: Fix a typo.
	* testsuite/ld-x86-64/x86-64.exp: Run pr20253-1 tests.

1 files changed, 173 insertions, 84 deletions

diff --git a/bfd/elf64-x86-64.c b/bfd/elf64-x86-64.c
index 57a3c73..f920208 100644
--- a/bfd/elf64-x86-64.c
+++ b/bfd/elf64-x86-64.c
@@ -2556,9 +2556,13 @@ pointer:
 		 adjust_dynamic_symbol.  */
 	      h->non_got_ref = 1;
 
-	      /* We may need a .plt entry if the function this reloc
-		 refers to is in a shared lib.  */
-	      h->plt.refcount += 1;
+	      /* We may need a .plt entry if the symbol is a function
+		 defined in a shared lib or is a STT_GNU_IFUNC function
+		 referenced from the code or read-only section.  */
+	      if (!h->def_regular
+		  || (sec->flags & (SEC_CODE | SEC_READONLY)) != 0)
+		h->plt.refcount += 1;
+
 	      if (r_type == R_X86_64_PC32)
 		{
 		  /* Since something like ".long foo - ." may be used
@@ -2605,7 +2609,10 @@ do_size:
 	     If on the other hand, we are creating an executable, we
 	     may need to keep relocations for symbols satisfied by a
 	     dynamic library if we manage to avoid copy relocs for the
-	     symbol.  */
+	     symbol.
+
+	     Generate dynamic pointer relocation against STT_GNU_IFUNC
+	     symbol in the non-code section.  */
 	  if ((bfd_link_pic (info)
 	       && (! IS_X86_64_PCREL_TYPE (r_type)
 		   || (h != NULL
@@ -2613,6 +2620,10 @@ do_size:
 			      || SYMBOLIC_BIND (info, h))
 			   || h->root.type == bfd_link_hash_defweak
 			   || !h->def_regular))))
+	      || (h != NULL
+		  && h->type == STT_GNU_IFUNC
+		  && r_type == htab->pointer_r_type
+		  && (sec->flags & SEC_CODE) == 0)
 	      || (ELIMINATE_COPY_RELOCS
 		  && !bfd_link_pic (info)
 		  && h != NULL
@@ -2850,12 +2861,17 @@ elf_x86_64_adjust_dynamic_symbol (struct bfd_link_info *info,
 
 	  if (pc_count || count)
 	    {
-	      h->needs_plt = 1;
 	      h->non_got_ref = 1;
-	      if (h->plt.refcount <= 0)
-		h->plt.refcount = 1;
-	      else
-		h->plt.refcount += 1;
+	      if (pc_count)
+		{
+		  /* Increment PLT reference count only for PC-relative
+		     references.  */
+		  h->needs_plt = 1;
+		  if (h->plt.refcount <= 0)
+		    h->plt.refcount = 1;
+		  else
+		    h->plt.refcount += 1;
+		}
 	    }
 	}
 
@@ -3049,7 +3065,7 @@ elf_x86_64_allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf)
 					      &htab->readonly_dynrelocs_against_ifunc,
 					      plt_entry_size,
 					      plt_entry_size,
-					      GOT_ENTRY_SIZE))
+					      GOT_ENTRY_SIZE, TRUE))
 	{
 	  asection *s = htab->plt_bnd;
 	  if (h->plt.offset != (bfd_vma) -1 && s != NULL)
@@ -4233,8 +4249,84 @@ elf_x86_64_relocate_section (bfd *output_bfd,
 		continue;
 	      abort ();
 	    }
-	  else if (h->plt.offset == (bfd_vma) -1)
-	    abort ();
+
+	  switch (r_type)
+	    {
+	    default:
+	      break;
+
+	    case R_X86_64_GOTPCREL:
+	    case R_X86_64_GOTPCRELX:
+	    case R_X86_64_REX_GOTPCRELX:
+	    case R_X86_64_GOTPCREL64:
+	      base_got = htab->elf.sgot;
+	      off = h->got.offset;
+
+	      if (base_got == NULL)
+		abort ();
+
+	      if (off == (bfd_vma) -1)
+		{
+		  /* We can't use h->got.offset here to save state, or
+		     even just remember the offset, as finish_dynamic_symbol
+		     would use that as offset into .got.  */
+
+		  if (h->plt.offset == (bfd_vma) -1)
+		    abort ();
+
+		  if (htab->elf.splt != NULL)
+		    {
+		      plt_index = h->plt.offset / plt_entry_size - 1;
+		      off = (plt_index + 3) * GOT_ENTRY_SIZE;
+		      base_got = htab->elf.sgotplt;
+		    }
+		  else
+		    {
+		      plt_index = h->plt.offset / plt_entry_size;
+		      off = plt_index * GOT_ENTRY_SIZE;
+		      base_got = htab->elf.igotplt;
+		    }
+
+		  if (h->dynindx == -1
+		      || h->forced_local
+		      || info->symbolic)
+		    {
+		      /* This references the local defitionion.  We must
+			 initialize this entry in the global offset table.
+			 Since the offset must always be a multiple of 8,
+			 we use the least significant bit to record
+			 whether we have initialized it already.
+
+			 When doing a dynamic link, we create a .rela.got
+			 relocation entry to initialize the value.  This
+			 is done in the finish_dynamic_symbol routine.	 */
+		      if ((off & 1) != 0)
+			off &= ~1;
+		      else
+			{
+			  bfd_put_64 (output_bfd, relocation,
+				      base_got->contents + off);
+			  /* Note that this is harmless for the GOTPLT64
+			     case, as -1 | 1 still is -1.  */
+			  h->got.offset |= 1;
+			}
+		    }
+		}
+
+	      relocation = (base_got->output_section->vma
+			    + base_got->output_offset + off);
+
+	      goto do_relocation;
+	    }
+
+	  if (h->plt.offset == (bfd_vma) -1)
+	    {
+	      /* Handle static pointers of STT_GNU_IFUNC symbols.  */
+	      if (r_type == htab->pointer_r_type
+		  && (input_section->flags & SEC_CODE) == 0)
+		goto do_ifunc_pointer;
+	      goto bad_ifunc_reloc;
+	    }
 
 	  /* STT_GNU_IFUNC symbol must go through PLT.  */
 	  if (htab->elf.splt != NULL)
@@ -4262,6 +4354,7 @@ elf_x86_64_relocate_section (bfd *output_bfd,
 	  switch (r_type)
 	    {
 	    default:
+bad_ifunc_reloc:
 	      if (h->root.root.string)
 		name = h->root.root.string;
 	      else
@@ -4269,8 +4362,8 @@ elf_x86_64_relocate_section (bfd *output_bfd,
 					 NULL);
 	      (*_bfd_error_handler)
 		(_("%B: relocation %s against STT_GNU_IFUNC "
-		   "symbol `%s' isn't handled by %s"), input_bfd,
-		 howto->name, name, __FUNCTION__);
+		   "symbol `%s' isn't supported"), input_bfd,
+		 howto->name, name);
 	      bfd_set_error (bfd_error_bad_value);
 	      return FALSE;
 
@@ -4284,6 +4377,7 @@ elf_x86_64_relocate_section (bfd *output_bfd,
 		goto do_relocation;
 	      /* FALLTHROUGH */
 	    case R_X86_64_64:
+do_ifunc_pointer:
 	      if (rel->r_addend != 0)
 		{
 		  if (h->root.root.string)
@@ -4300,8 +4394,10 @@ elf_x86_64_relocate_section (bfd *output_bfd,
 		}
 
 	      /* Generate dynamic relcoation only when there is a
-		 non-GOT reference in a shared object.  */
-	      if (bfd_link_pic (info) && h->non_got_ref)
+		 non-GOT reference in a shared object or there is no
+		 PLT.  */
+	      if ((bfd_link_pic (info) && h->non_got_ref)
+		  || h->plt.offset == (bfd_vma) -1)
 		{
 		  Elf_Internal_Rela outrel;
 		  asection *sreloc;
@@ -4335,7 +4431,16 @@ elf_x86_64_relocate_section (bfd *output_bfd,
 		      outrel.r_addend = 0;
 		    }
 
-		  sreloc = htab->elf.irelifunc;
+		  /* Dynamic relocations are stored in
+		     1. .rela.ifunc section in PIC object.
+		     2. .rela.got section in dynamic executable.
+		     3. .rela.iplt section in static executable.  */
+		  if (bfd_link_pic (info))
+		    sreloc = htab->elf.irelifunc;
+		  else if (htab->elf.splt != NULL)
+		    sreloc = htab->elf.srelgot;
+		  else
+		    sreloc = htab->elf.irelplt;
 		  elf_append_rela (output_bfd, sreloc, &outrel);
 
 		  /* If this reloc is against an external symbol, we
@@ -4352,66 +4457,6 @@ elf_x86_64_relocate_section (bfd *output_bfd,
 	    case R_X86_64_PLT32:
 	    case R_X86_64_PLT32_BND:
 	      goto do_relocation;
-
-	    case R_X86_64_GOTPCREL:
-	    case R_X86_64_GOTPCRELX:
-	    case R_X86_64_REX_GOTPCRELX:
-	    case R_X86_64_GOTPCREL64:
-	      base_got = htab->elf.sgot;
-	      off = h->got.offset;
-
-	      if (base_got == NULL)
-		abort ();
-
-	      if (off == (bfd_vma) -1)
-		{
-		  /* We can't use h->got.offset here to save state, or
-		     even just remember the offset, as finish_dynamic_symbol
-		     would use that as offset into .got.  */
-
-		  if (htab->elf.splt != NULL)
-		    {
-		      plt_index = h->plt.offset / plt_entry_size - 1;
-		      off = (plt_index + 3) * GOT_ENTRY_SIZE;
-		      base_got = htab->elf.sgotplt;
-		    }
-		  else
-		    {
-		      plt_index = h->plt.offset / plt_entry_size;
-		      off = plt_index * GOT_ENTRY_SIZE;
-		      base_got = htab->elf.igotplt;
-		    }
-
-		  if (h->dynindx == -1
-		      || h->forced_local
-		      || info->symbolic)
-		    {
-		      /* This references the local defitionion.  We must
-			 initialize this entry in the global offset table.
-			 Since the offset must always be a multiple of 8,
-			 we use the least significant bit to record
-			 whether we have initialized it already.
-
-			 When doing a dynamic link, we create a .rela.got
-			 relocation entry to initialize the value.  This
-			 is done in the finish_dynamic_symbol routine.	 */
-		      if ((off & 1) != 0)
-			off &= ~1;
-		      else
-			{
-			  bfd_put_64 (output_bfd, relocation,
-				      base_got->contents + off);
-			  /* Note that this is harmless for the GOTPLT64
-			     case, as -1 | 1 still is -1.  */
-			  h->got.offset |= 1;
-			}
-		    }
-		}
-
-	      relocation = (base_got->output_section->vma
-			    + base_got->output_offset + off);
-
-	      goto do_relocation;
 	    }
 	}
 
@@ -5870,6 +5915,7 @@ elf_x86_64_finish_dynamic_symbol (bfd *output_bfd,
       && !local_undefweak)
     {
       Elf_Internal_Rela rela;
+      asection *relgot = htab->elf.srelgot;
 
       /* This symbol has an entry in the global offset table.  Set it
 	 up.  */
@@ -5888,7 +5934,27 @@ elf_x86_64_finish_dynamic_symbol (bfd *output_bfd,
       if (h->def_regular
 	  && h->type == STT_GNU_IFUNC)
 	{
-	  if (bfd_link_pic (info))
+	  if (h->plt.offset == (bfd_vma) -1)
+	    {
+	      /* STT_GNU_IFUNC is referenced without PLT.  */
+	      if (htab->elf.splt == NULL)
+		{
+		  /* use .rel[a].iplt section to store .got relocations
+		     in static executable.  */
+		  relgot = htab->elf.irelplt;
+		}
+	      if (SYMBOL_REFERENCES_LOCAL (info, h))
+		{
+		  rela.r_info = htab->r_info (0,
+					      R_X86_64_IRELATIVE);
+		  rela.r_addend = (h->root.u.def.value
+				   + h->root.u.def.section->output_section->vma
+				   + h->root.u.def.section->output_offset);
+		}
+	      else
+		goto do_glob_dat;
+	    }
+	  else if (bfd_link_pic (info))
 	    {
 	      /* Generate R_X86_64_GLOB_DAT.  */
 	      goto do_glob_dat;
@@ -5932,7 +5998,7 @@ do_glob_dat:
 	  rela.r_addend = 0;
 	}
 
-      elf_append_rela (output_bfd, htab->elf.srelgot, &rela);
+      elf_append_rela (output_bfd, relgot, &rela);
     }
 
   if (h->needs_copy)
@@ -6265,11 +6331,6 @@ elf_x86_64_finish_dynamic_sections (bfd *output_bfd,
     elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize
       = GOT_ENTRY_SIZE;
 
-  /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols.  */
-  htab_traverse (htab->loc_hash_table,
-		 elf_x86_64_finish_local_dynamic_symbol,
-		 info);
-
   /* Fill PLT entries for undefined weak symbols in PIE.  */
   if (bfd_link_pie (info))
     bfd_hash_traverse (&info->hash->table,
@@ -6279,6 +6340,33 @@ elf_x86_64_finish_dynamic_sections (bfd *output_bfd,
   return TRUE;
 }
 
+/* Fill PLT/GOT entries and allocate dynamic relocations for local
+   STT_GNU_IFUNC symbols, which aren't in the ELF linker hash table.
+   It has to be done before elf_link_sort_relocs is called so that
+   dynamic relocations are properly sorted.  */
+
+static bfd_boolean
+elf_x86_64_output_arch_local_syms
+  (bfd *output_bfd ATTRIBUTE_UNUSED,
+   struct bfd_link_info *info,
+   void *flaginfo ATTRIBUTE_UNUSED,
+   int (*func) (void *, const char *,
+		Elf_Internal_Sym *,
+		asection *,
+		struct elf_link_hash_entry *) ATTRIBUTE_UNUSED)
+{
+  struct elf_x86_64_link_hash_table *htab = elf_x86_64_hash_table (info);
+  if (htab == NULL)
+    return FALSE;
+
+  /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols.  */
+  htab_traverse (htab->loc_hash_table,
+		 elf_x86_64_finish_local_dynamic_symbol,
+		 info);
+
+  return TRUE;
+}
+
 /* Return an array of PLT entry symbol values.  */
 
 static bfd_vma *
@@ -6641,6 +6729,7 @@ static const struct bfd_elf_special_section
 #define elf_backend_create_dynamic_sections elf_x86_64_create_dynamic_sections
 #define elf_backend_finish_dynamic_sections elf_x86_64_finish_dynamic_sections
 #define elf_backend_finish_dynamic_symbol   elf_x86_64_finish_dynamic_symbol
+#define elf_backend_output_arch_local_syms  elf_x86_64_output_arch_local_syms
 #define elf_backend_gc_mark_hook	    elf_x86_64_gc_mark_hook
 #define elf_backend_grok_prstatus	    elf_x86_64_grok_prstatus
 #define elf_backend_grok_psinfo		    elf_x86_64_grok_psinfo