[Bug ld/20022] --gc-sections is broken with __start_ and shared library

[hjl.tools at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=20022

--- Comment #6 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Nick Clifton from comment #5)
> (In reply to H.J. Lu from comment #4)
> 
> > Somewhere in _bfd_elf_is_start_stop?
> 
> I don't think that will work.  We only want to trigger if an orphan section
> is being referenced solely via its start/stop symbols, and I don't think that
> we can determine this in _bfd_elf_is_start_stop.
> 
> Still if you have a potential patch to suggest I would be happy to take a
> look.

I don't have a real patch.  This patch:

https://sourceware.org/ml/binutils/2016-04/msg00449.html

contains changes to _bfd_elf_is_start_stop to detect such
case.  It may be used to issue an error.

> I think that the patch should produce a warning/error message, rather than an
> abort however, since the user is not doing anything wrong.

An error is better.

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