PR29540, R_PPC64_NONE in .rela.dyn when linking Linux vdso

PR29540, R_PPC64_NONE in .rela.dyn when linking Linux vdso

[Alan Modra]

There is code in the ppc backend to ignore relocs against local
symbols defined in discarded sections (search for local_dynrel), but
somehow not for global symbols.  Add the missing support.

	PR 29540
	* elf64-ppc.c (allocate_dynrelocs): Don't alloc space for relocs
	against discarded sections.
	(ppc64_elf_size_dynamic_sections): Use standard test for discarded
	sections.
	* elf32-ppc.c (allocate_dynrelocs): Don't alloc space for relocs
	against discarded sections.
	(ppc_elf_size_dynamic_sections): Use standard test for discarded
	sections.

diff --git a/bfd/elf32-ppc.c b/bfd/elf32-ppc.c
index 1f77e18133a..0eebadc1e37 100644
--- a/bfd/elf32-ppc.c
+++ b/bfd/elf32-ppc.c
@@ -5268,12 +5268,13 @@ allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
 
   /* Allocate space.  */
   for (p = h->dyn_relocs; p != NULL; p = p->next)
-    {
-      asection *sreloc = elf_section_data (p->sec)->sreloc;
-      if (eh->elf.type == STT_GNU_IFUNC)
-	sreloc = htab->elf.irelplt;
-      sreloc->size += p->count * sizeof (Elf32_External_Rela);
-    }
+    if (!discarded_section (p->sec))
+      {
+	asection *sreloc = elf_section_data (p->sec)->sreloc;
+	if (eh->elf.type == STT_GNU_IFUNC)
+	  sreloc = htab->elf.irelplt;
+	sreloc->size += p->count * sizeof (Elf32_External_Rela);
+      }
 
   /* Handle PLT relocs.  Done last, after dynindx has settled.
      We might need a PLT entry when the symbol
@@ -5535,8 +5536,7 @@ ppc_elf_size_dynamic_sections (bfd *output_bfd,
 	       p != NULL;
 	       p = p->next)
 	    {
-	      if (!bfd_is_abs_section (p->sec)
-		  && bfd_is_abs_section (p->sec->output_section))
+	      if (discarded_section (p->sec))
 		{
 		  /* Input section has been discarded, either because
 		     it is a copy of a linkonce section or due to
diff --git a/bfd/elf64-ppc.c b/bfd/elf64-ppc.c
index f1e482faed4..5329bb64afb 100644
--- a/bfd/elf64-ppc.c
+++ b/bfd/elf64-ppc.c
@@ -10000,20 +10000,21 @@ allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
 
       /* Finally, allocate space.  */
       for (p = (struct ppc_dyn_relocs *) h->dyn_relocs; p != NULL; p = p->next)
-	{
-	  unsigned int count;
-	  asection *sreloc = elf_section_data (p->sec)->sreloc;
-	  if (eh->elf.type == STT_GNU_IFUNC)
-	    sreloc = htab->elf.irelplt;
-	  count = p->count;
-	  if (info->enable_dt_relr
-	      && ((!NO_OPD_RELOCS
-		   && ppc64_elf_section_data (p->sec)->sec_type == sec_opd)
-		  || (eh->elf.type != STT_GNU_IFUNC
-		      && SYMBOL_REFERENCES_LOCAL (info, h))))
-	    count -= p->rel_count;
-	  sreloc->size += count * sizeof (Elf64_External_Rela);
-	}
+	if (!discarded_section (p->sec))
+	  {
+	    unsigned int count;
+	    asection *sreloc = elf_section_data (p->sec)->sreloc;
+	    if (eh->elf.type == STT_GNU_IFUNC)
+	      sreloc = htab->elf.irelplt;
+	    count = p->count;
+	    if (info->enable_dt_relr
+		&& ((!NO_OPD_RELOCS
+		     && ppc64_elf_section_data (p->sec)->sec_type == sec_opd)
+		    || (eh->elf.type != STT_GNU_IFUNC
+			&& SYMBOL_REFERENCES_LOCAL (info, h))))
+	      count -= p->rel_count;
+	    sreloc->size += count * sizeof (Elf64_External_Rela);
+	  }
     }
 
   /* We might need a PLT entry when the symbol
@@ -10248,8 +10249,7 @@ ppc64_elf_size_dynamic_sections (bfd *output_bfd,
 
 	  for (p = elf_section_data (s)->local_dynrel; p != NULL; p = p->next)
 	    {
-	      if (!bfd_is_abs_section (p->sec)
-		  && bfd_is_abs_section (p->sec->output_section))
+	      if (discarded_section (p->sec))
 		{
 		  /* Input section has been discarded, either because
 		     it is a copy of a linkonce section or due to

-- 
Alan Modra
Australia Development Lab, IBM