[Bug ld/21964] __start_SCN symbols aren't exported anymore

[hjl.tools at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=21964

--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Michael Matz from comment #0)
> Commit cbd0eecf reworked the provision of __start_ and __stop_ symbols for
> sections with C-representable names (e.g. to always provide them, not only
> for orphaned sections).  Amongst other things it also made all these provided
> symbols hidden.  Alans later rewrite (commit 7dba9362) of this code didn't
> change this.  That actively breaks existing code.
> 
> E.g. in libqb (used by pacemaker) the logging facility uses per-call-site
> static variables as log descriptors.  These are all placed into a section
> named
> __verbose.  There's a routine that registers all such sections by walking
> over all loaded shared libs via dl_iterate_phdr, and looking for
> __start__verbose and __stop___verbose symbols via dlsym.
> 
> That seems a reasonable approach to implement such facility, and making the
> symbols hidden defeats this.  The commit message indicates only "so that they
> don't conflict" as reason for making them hidden.  At least for these symbols
> for orphaned sections I don't see any indication that this was actually a
> problem.  OTOH it breaks existing usage.
> 
> So, can we please have back the old behaviour at least for the
> __start/__stop symbols for orphaned sections?
> 

What should happen when there is _verbose section in more than one shared
object?

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