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

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

------- Comment #42 from hjl at lucon dot org  2007-11-05 14:18 -------
(In reply to comment #39)
> Subject: Re:  [4.3 Regression] typeinfo name referenced in ... defined in
> discarded section
> 
> 
> On 04/11/2007, at 7:01 PM, hjl at lucon dot org wrote:
> 
> >> - Won't this cause the global variable to be discarded if anyone
> >> defines a different global variable which also references the same
> >> string?
> >
> > The comdat group should have both global variables defined.
> 
> I'm talking about
> 
> static char * some_variable = "hi there";
> 
> and in some other file
> 
> static char * some_variable = "hi there";
> 
> the compiler does not know that there are two files containing  
> 'some_variable', and they have to be different variables (someone  
> might change one of them and the other should not change if that  
> happens), but the two "hi there" strings should be shared.
> 
> How should the compiler represent this in ELF?
> 

1. Put "hi there" in a comdat group.
2. Mark "hi there" global and hidden.


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