[Bug c++/33871] [4.3 Regression] typeinfo name referenced in ... defined in discarded section

["geoffk at geoffk dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #27 from geoffk at geoffk dot org  2007-11-03 07:21 -------
Subject: Re:  [4.3 Regression] typeinfo name referenced in ... defined in
discarded section


On 30/10/2007, at 9:03 PM, amodra at bigpond dot net dot au wrote:

> ------- Comment #26 from amodra at bigpond dot net dot au   
> 2007-10-31 04:03 -------
> I believe the linker is correct to reject relocations against local  
> symbols in
> discarded sections.  The reason being that the linker allows  
> linkonce (and
> comdat group) section contents to differ between two files, so that  
> for
> example, two files may be compiled with different optimisations yet  
> still link
> correctly.  Since the contents may differ, the location of symbols  
> within the
> section may also differ between files.  Using the value of  
> "local_sym + offset"
> in one file (in the discarded section) may point to an entirely  
> wrong location
> in the other file (in the kept section).

In this case, though, the contents of the linkonce section will never  
actually differ; and I believe in this case the offset is zero, so  
even if they did differ it would not matter.  Perhaps a zero offset  
should be special-cased?


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33871