[Bug gold/18440] ICF depends on the section name to detect constructors and destructors

[rafael.espindola at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=18440

--- Comment #2 from Rafael Ávila de Espíndola <rafael.espindola at gmail dot 
com> ---
> > This unfortunately doesn't work if the compiler avoids producing the long
> > section names (as llvm now can).
> 
> Can we use the symbol name directly?

That would be nice. Which is why I asked:

> > Is there a convenient pass over the symbols that could be used for this
> > instead?

Looks like there is, could we use the walk done from
Symbol_table::add_from_relob to check if a section has just a constructor in
it? We already use that walk to mark symbols as gc roots.

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