PR21167, relocation sections not included in groups

This fixes a wart I've known about for years, but haven't done
anything about because BFD treats relocation sections as an adjunct to
the section they relocate.  SHF_GROUP on the section thus implicitly
applies to its relocation section(s), but it is an error that the
reloc sections aren't part of the group.

Like many patches to gas, this wasn't as straightforward as it could
be due to a number of backends, i386, cr16 and others, removing relocs
in tc_get_reloc rather than marking them as "done" earlier in
md_apply_reloc.  So it isn't possible for the group support to
reliably detect the presence of relocs by looking at fixups earlier
than write_relocs.  However the group support needs to create
signature symbols, and that must be done before the symbol table is
frozen, before write_relocs.  So split off the group sizing from
elf_adjust_symtab and put it in elf_frob_file_after_relocs.

bfd/
	PR 21167
	* elf.c (_bfd_elf_setup_sections): Don't trim reloc sections from
	groups.
	(_bfd_elf_init_reloc_shdr): Pass sec_hdr, use it to copy SHF_GROUP
	flag from section.
	(elf_fake_sections): Adjust calls.  Exit immediately on failure.
	(bfd_elf_set_group_contents): Add associated reloc section indices
	to group contents
gas/
	PR 21167
	* config/obj-elf.c (struct group_list): Delete elt_count.
	(groups): New static.
	(build_group_lists): Don't count elements.
	(elf_adjust_symtab): Use groups rather than auto list.  Set up
	pointer from group member to SHT_GROUP section.  Don't size
	SHT_GROUP section or clean up here..
	(elf_frob_file_after_relocs): ..do so here instead.
	* testsuite/gas/arc/jli-1.d,
	* testsuite/gas/elf/groupautob.d,
	* testsuite/gas/mips/compact-eh-eb-2.d,
	* testsuite/gas/mips/compact-eh-eb-5.d,
	* testsuite/gas/mips/compact-eh-el-2.d,
	* testsuite/gas/mips/compact-eh-el-5.d: Adjust.
ld/
	PR 21167
	* testsuite/ld-elf/group9b.d: Adjust for relocs included in group.

6 files changed, 6 insertions, 5 deletions

diff --git a/gas/testsuite/gas/arc/jli-1.d b/gas/testsuite/gas/arc/jli-1.d
index 10550a2..46587be 100644
--- a/gas/testsuite/gas/arc/jli-1.d
+++ b/gas/testsuite/gas/arc/jli-1.d
@@ -9,6 +9,7 @@ Disassembly of section .group:
 00000000 <jlitab.foo>:
    0:	0[10] 00 00 0[01]             	.word	0x00000001
    4:	0[60] 00 00 0[06]             	.word	0x00000006
+   8:	0[70] 00 00 0[07]             	.word	0x00000007
 
 Disassembly of section .text:
 
diff --git a/gas/testsuite/gas/elf/groupautob.d b/gas/testsuite/gas/elf/groupautob.d
index 76c60b4..5f6081f 100644
--- a/gas/testsuite/gas/elf/groupautob.d
+++ b/gas/testsuite/gas/elf/groupautob.d
@@ -3,7 +3,7 @@
 #source: groupauto.s
 
 #...
-COMDAT group section \[    1\] `\.group' \[some_group\] contains 2 sections:
+COMDAT group section \[    1\] `\.group' \[some_group\] contains [23] sections:
 [ 	]+\[Index\][ 	]+Name
 [ 	]+\[.*\][ 	]+.text
 [ 	]+\[.*\][ 	]+.note.bar
diff --git a/gas/testsuite/gas/mips/compact-eh-eb-2.d b/gas/testsuite/gas/mips/compact-eh-eb-2.d
index 226a5ff..feefafa 100644
--- a/gas/testsuite/gas/mips/compact-eh-eb-2.d
+++ b/gas/testsuite/gas/mips/compact-eh-eb-2.d
@@ -23,7 +23,7 @@ OFFSET   TYPE              VALUE
 
 
 Contents of section .group:
- 0000 00000001 00000007                   .*
+ 0000 00000001 00000007 00000008          .*
 Contents of section .text:
  0000 00000000.*
 Contents of section .reginfo:
diff --git a/gas/testsuite/gas/mips/compact-eh-eb-5.d b/gas/testsuite/gas/mips/compact-eh-eb-5.d
index fd278a1..79a65bb 100644
--- a/gas/testsuite/gas/mips/compact-eh-eb-5.d
+++ b/gas/testsuite/gas/mips/compact-eh-eb-5.d
@@ -23,7 +23,7 @@ OFFSET   TYPE              VALUE
 
 
 Contents of section .group:
- 0000 00000001 00000007                    .*
+ 0000 00000001 00000007 00000008           .*
 Contents of section .text:
  0000 00000000 00000000 00000000 00000000  .*
  0010 00000000.*
diff --git a/gas/testsuite/gas/mips/compact-eh-el-2.d b/gas/testsuite/gas/mips/compact-eh-el-2.d
index 80627eb..f5fe968 100644
--- a/gas/testsuite/gas/mips/compact-eh-el-2.d
+++ b/gas/testsuite/gas/mips/compact-eh-el-2.d
@@ -23,7 +23,7 @@ OFFSET   TYPE              VALUE
 
 
 Contents of section .group:
- 0000 01000000 07000000                    .*
+ 0000 01000000 07000000 08000000           .*
 Contents of section .text:
  0000 00000000.*
 Contents of section .reginfo:
diff --git a/gas/testsuite/gas/mips/compact-eh-el-5.d b/gas/testsuite/gas/mips/compact-eh-el-5.d
index 7f07622..aa84332 100644
--- a/gas/testsuite/gas/mips/compact-eh-el-5.d
+++ b/gas/testsuite/gas/mips/compact-eh-el-5.d
@@ -22,7 +22,7 @@ OFFSET   TYPE              VALUE
 
 
 Contents of section .group:
- 0000 01000000 07000000                    .*
+ 0000 01000000 07000000 08000000           .*
 Contents of section .text:
  0000 00000000 00000000 00000000 00000000  .*
  0010 00000000.*