[Bug gas/21167] New: gas v2.28.51 does not include .rel[a] sections to groups

[georgerim at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=21167

            Bug ID: 21167
           Summary: gas v2.28.51 does not include .rel[a] sections to
                    groups
           Product: binutils
           Version: 2.29 (HEAD)
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gas
          Assignee: unassigned at sourceware dot org
          Reporter: georgerim at gmail dot com
  Target Milestone: ---

Assume next code (1.s):

.section .text,"axG",@progbits,foo,comdat
.quad bar

./as-new 1.s -o out
readelf -a out

 [ 5] .text             PROGBITS         0000000000000000  00000048
       0000000000000008  0000000000000000 AXG       0     0     1
 [ 6] .rela.text        RELA             0000000000000000  00000120
       0000000000000018  0000000000000018   I       7     5     8

As shown, .rela.text is present for .text, it has 5 as sh_info field, but gas
does not include it into group:
COMDAT group section [    1] `.group' [foo] contains 1 sections:
   [Index]    Name
   [    5]   .text

During the "regular" part of the link, the linker includes or discards groups
as a unit.
ELF spec that says: "There may *not* be non-symbol references to the sections
comprising a group from outside the group, for example, use of a group member's
section header index in an sh_link or sh_info member."

So it looks to be violation of spec.

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