[Bug ld/17666] New: ld -r may create reloc sections with unordered relocs

[amodra at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=17666

            Bug ID: 17666
           Summary: ld -r may create reloc sections with unordered relocs
           Product: binutils
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: amodra at gmail dot com

cat > text1.s <<EOF
 .section ".text1","ax",%progbits
.L1:
 .dc.a .L2

 .data
.L2:
 .dc.a .L1
EOF
cat > text.s <<EOF
 .text
.L1:
 .dc.a .L2

 .data
.L2:
 .dc.a .L1
EOF
as -o text1.o text1.s
as -o text.o text.s
# remove empty sections
objcopy -R .text -R .bss text1.o
objcopy -R .bss text.o
ld -r -o out.o text1.o text.o
objdump -r -j.data out.o

shows .data relocs out of order.

This bug is caused by elflink.c processing text1.o first due to this loop:
  for (o = abfd->sections; o != NULL; o = o->next)
    {
      for (p = o->map_head.link_order; p != NULL; p = p->next)
    {
      if (p->type == bfd_indirect_link_order
          && (bfd_get_flavour ((sub = p->u.indirect.section->owner))
          == bfd_target_elf_flavour)
          && elf_elfheader (sub)->e_ident[EI_CLASS] == bed->s->elfclass)
        {
          if (! sub->output_has_begun)
        {
          if (! elf_link_input_bfd (&flinfo, sub))
            goto error_return;
          sub->output_has_begun = TRUE;
        }
and the fact that reloc sections are not placed by the generic linker.

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