bfd: support section groups with preceding SHF_GROUP sections

GAS always places section groups (SHT_GROUP) before the rest of the
sections in the output file.  However, other assemblers may place
section groups after the group members.

This patch fixes handlign such situations, and removes some duplicated
logic.

bfd/ChangeLog:

2017-06-06  Jose E. Marchesi  <jose.marchesi@oracle.com>

	* elf.c (setup_group): Make sure BFD sections are created for all
	group sections in the input file when processing SHF_GROUP
	sections.
	(bfd_section_from_shdr): Avoid duplicating logic already
	implemented in `setup_group'.

1 files changed, 5 insertions, 28 deletions

diff --git a/bfd/elf.c b/bfd/elf.c
index bab1e16f8c..fb106e9449 100644
--- a/bfd/elf.c
+++ b/bfd/elf.c
@@ -636,6 +636,11 @@ setup_group (bfd *abfd, Elf_Internal_Shdr *hdr, asection *newsect)
 		  unsigned char *src;
 		  Elf_Internal_Group *dest;
 
+                  /* Make sure the group section has a BFD section
+                     attached to it.  */
+                  if (!bfd_section_from_shdr (abfd, i))
+                    return FALSE;
+                  
 		  /* Add to list of sections.  */
 		  elf_tdata (abfd)->group_sect_ptr[num_group] = shdr;
 		  num_group += 1;
@@ -2421,34 +2426,6 @@ bfd_section_from_shdr (bfd *abfd, unsigned int shindex)
       if (!_bfd_elf_make_section_from_shdr (abfd, hdr, name, shindex))
 	goto fail;
 
-      if (hdr->contents != NULL)
-	{
-	  Elf_Internal_Group *idx = (Elf_Internal_Group *) hdr->contents;
-	  unsigned int n_elt = hdr->sh_size / sizeof (* idx);
-	  asection *s;
-
-	  if (n_elt == 0)
-	    goto fail;
-	  if (idx->flags & GRP_COMDAT)
-	    hdr->bfd_section->flags
-	      |= SEC_LINK_ONCE | SEC_LINK_DUPLICATES_DISCARD;
-
-	  /* We try to keep the same section order as it comes in.  */
-	  idx += n_elt;
-
-	  while (--n_elt != 0)
-	    {
-	      --idx;
-
-	      if (idx->shdr != NULL
-		  && (s = idx->shdr->bfd_section) != NULL
-		  && elf_next_in_group (s) != NULL)
-		{
-		  elf_next_in_group (hdr->bfd_section) = s;
-		  break;
-		}
-	    }
-	}
       goto success;
 
     default: