[Bug ld/23591] undefined reference to `__start___sancov_cntrs' when building with clang + asan + fuzzing + ld.bfd

[hjl.tools at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=23591

H.J. Lu <hjl.tools at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |WAITING
   Last reconfirmed|                            |2018-08-30
     Ever confirmed|0                           |1

--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Mike Hommey from comment #1)
> It seems to be due to most __sancov_cntrs sections having the SHT_GROUP flag.
> This makes _bfd_elf_section_already_linked set the section's output_section
> to bfd_abs_section_ptr, which then fulfils the condition in undef_start_stop
> (bfs_abs_section_ptr->owner != link_info.output_bfd), which then marks the
> __start/__stop symbols as undefined.

>From gABI:

SHT_GROUP
This section defines a section group. A section group is a set of sections that
are related and that must be treated specially by the linker (see below for
further details). Sections of type SHT_GROUP may appear only in relocatable
objects (objects with the ELF header e_type member set to ET_REL). The section
header table entry for a group section must appear in the section header table
before the entries for any of the sections that are members of the group.

How were __sancov_cntrs sections generated?

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