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Linker garbage collection should not collect unreferenced symbols if they are externally visible and export-dynamic is on

Ian Lance Taylor iant@google.com
Mon Oct 31 21:24:00 GMT 2011 
Sriraman Tallam <tmsriram@google.com> writes:

> 	* symtab.h (Symbol_table::gc_mark_symbol_for_shlib): Rename to
> 	gc_mark_symbol.
> 	* symtab.cc (Symbol_table::gc_mark_symbol_for_shlib): Rename to
> 	gc_mark_symbol.
> 	Change to just keep the section associated with symbol.
> 	(Symbol_table::add_from_relobj): Mark symbols as not garbage when
> 	they are externally visible and --export-dynamic is turned on.
> 	(Symbol_table::gc_mark_dyn_syms): Call gc_mark_symbol.


>  void
> -Symbol_table::gc_mark_symbol_for_shlib(Symbol* sym)
> +Symbol_table::gc_mark_symbol(Symbol* sym)
>  {
> -  if (!sym->is_from_dynobj() 
> -      && sym->is_externally_visible())
> +  //Add the object and section to the work list.

Space after "//".


> @@ -626,16 +622,7 @@ Symbol_table::gc_mark_dyn_syms(Symbol* s
>  {
>    if (sym->in_dyn() && sym->source() == Symbol::FROM_OBJECT
>        && !sym->object()->is_dynamic())
> -    {
> -      Relobj* obj = static_cast<Relobj*>(sym->object()); 
> -      bool is_ordinary;
> -      unsigned int shndx = sym->shndx(&is_ordinary);
> -      if (is_ordinary && shndx != elfcpp::SHN_UNDEF)
> -        {
> -          gold_assert(this->gc_ != NULL);
> -          this->gc_->worklist().push(Section_id(obj, shndx));
> -        }
> -    }
> +    gc_mark_symbol(sym);
>  }

Write this->gc_mark_symbol(sym);


This is OK with those changes.

Thanks.

Ian
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