[Bug ld/21562] Refs to __start_SCN of non-orphan sections affect --gc-sections

[hjl.tools at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=21562

--- Comment #8 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Alexander Monakov from comment #7)
> (In reply to H.J. Lu from comment #6)
> > I posted a patch to always define referenced __start_SECNAME/__stop_SECNAME:
> 
> That's quite confusing, because originally bug 21557 (wrongly) complained
> about those symbols not being defined, and you closed that bug as WONTFIX.
> If you changed your mind, can you please update that bug?

I will update it after my patch has been checked in.

> I don't see the reason to extend __start_SECNAME auto-provisioning, it seems
> it would be simpler to avoid extraneous gc-marking shown in this bug.

The new approach is faster and happens to support non-orphaned sections.

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