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

[mh-sourceware at glandium dot org]

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

--- Comment #1 from Mike Hommey <mh-sourceware at glandium dot org> ---
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.

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