[PATCH] GC: Also check the local debug definition section

[H.J. Lu]

Extend

commit b7c871edcd83ccdc5fcd8148a7f433efd6b52255
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Wed May 17 07:57:15 2017 -0700

    Mark debug sections referenced by kept debug sections

to handle the local debug definition section.

OK for master?

H.J.
	PR ld/20882
	* elflink.c (elf_gc_mark_debug_section): Also check the local
	debug definition section.
---
 bfd/elflink.c | 25 ++++++++++++++++++-------
 1 file changed, 18 insertions(+), 7 deletions(-)

diff --git a/bfd/elflink.c b/bfd/elflink.c
index 092edaea26..6a3d516ba8 100644
--- a/bfd/elflink.c
+++ b/bfd/elflink.c
@@ -12802,20 +12802,31 @@ _bfd_elf_gc_mark_hook (asection *sec,
   return NULL;
 }
 
-/* Return the global debug definition section.  */
+/* Return the debug definition section.  */
 
 static asection *
 elf_gc_mark_debug_section (asection *sec ATTRIBUTE_UNUSED,
 			   struct bfd_link_info *info ATTRIBUTE_UNUSED,
 			   Elf_Internal_Rela *rel ATTRIBUTE_UNUSED,
 			   struct elf_link_hash_entry *h,
-			   Elf_Internal_Sym *sym ATTRIBUTE_UNUSED)
+			   Elf_Internal_Sym *sym)
 {
-  if (h != NULL
-      && (h->root.type == bfd_link_hash_defined
-	  || h->root.type == bfd_link_hash_defweak)
-      && (h->root.u.def.section->flags & SEC_DEBUGGING) != 0)
-    return h->root.u.def.section;
+  if (h != NULL)
+    {
+      /* Return the global debug definition section.  */
+      if ((h->root.type == bfd_link_hash_defined
+	   || h->root.type == bfd_link_hash_defweak)
+	  && (h->root.u.def.section->flags & SEC_DEBUGGING) != 0)
+	return h->root.u.def.section;
+    }
+  else
+    {
+      /* Return the local debug definition section.  */
+      asection *isec = bfd_section_from_elf_index (sec->owner,
+						   sym->st_shndx);
+      if ((isec->flags & SEC_DEBUGGING) != 0)
+	return isec;
+    }
 
   return NULL;
 }
-- 
2.14.3