Consistency check for merge sections

[Alan Modra]

We can't allow sections to be merged and sized by the ELF linker
backend and then later be output by the generic linker backend.  The
generic linker backend doesn't understand merge sections.

	PR ld/19013
	* elflink.c (_bfd_elf_merge_sections): Only merge input bfds that
	will be handled by elf_link_input_bfd.  Rename abfd param to obfd.

diff --git a/bfd/elflink.c b/bfd/elflink.c
index ff7ae73..90af6cf 100644
--- a/bfd/elflink.c
+++ b/bfd/elflink.c
@@ -6814,7 +6814,7 @@ merge_sections_remove_hook (bfd *abfd ATTRIBUTE_UNUSED,
 /* Finish SHF_MERGE section merging.  */
 
 bfd_boolean
-_bfd_elf_merge_sections (bfd *abfd, struct bfd_link_info *info)
+_bfd_elf_merge_sections (bfd *obfd, struct bfd_link_info *info)
 {
   bfd *ibfd;
   asection *sec;
@@ -6823,7 +6823,10 @@ _bfd_elf_merge_sections (bfd *abfd, struct bfd_link_info *info)
     return FALSE;
 
   for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
-    if ((ibfd->flags & DYNAMIC) == 0)
+    if ((ibfd->flags & DYNAMIC) == 0
+	&& bfd_get_flavour (ibfd) == bfd_target_elf_flavour
+	&& (elf_elfheader (ibfd)->e_ident[EI_CLASS]
+	    == get_elf_backend_data (obfd)->s->elfclass))
       for (sec = ibfd->sections; sec != NULL; sec = sec->next)
 	if ((sec->flags & SEC_MERGE) != 0
 	    && !bfd_is_abs_section (sec->output_section))
@@ -6831,7 +6834,7 @@ _bfd_elf_merge_sections (bfd *abfd, struct bfd_link_info *info)
 	    struct bfd_elf_section_data *secdata;
 
 	    secdata = elf_section_data (sec);
-	    if (! _bfd_add_merge_section (abfd,
+	    if (! _bfd_add_merge_section (obfd,
 					  &elf_hash_table (info)->merge_info,
 					  sec, &secdata->sec_info))
 	      return FALSE;
@@ -6840,7 +6843,7 @@ _bfd_elf_merge_sections (bfd *abfd, struct bfd_link_info *info)
 	  }
 
   if (elf_hash_table (info)->merge_info != NULL)
-    _bfd_merge_sections (abfd, info, elf_hash_table (info)->merge_info,
+    _bfd_merge_sections (obfd, info, elf_hash_table (info)->merge_info,
 			 merge_sections_remove_hook);
   return TRUE;
 }

-- 
Alan Modra
Australia Development Lab, IBM