[Bug target/40068] GCC fails to apply dllexport attribute to typeinfo.

["dannysmith at users dot sourceforge dot net" <gcc-bugzilla@gcc.gnu.org>]

------- Comment #6 from dannysmith at users dot sourceforge dot net  2009-05-13 08:12 -------
(In reply to comment #5)

>   Also, I don't think this is necessarily an either-or situation; we could add
> my patch and have the typeinfo exported from the DLL, and also add yours so
> that clients could link a comdat copy (which would override the import stub)
> until we have a better solution for importing from the DLL.

Yes.  I was just thinking out loud.  I have no objection to your patch. 
Perhaps MULTIPLE_SYMBOL_SPACES should be defined in terms of an
-mmultiple-symbol-spaces target option , since if we depend on auto-import than
we should treat dll imports thae same as static lib imports.

> Also, how come emitting the typeinfo .linkonce as we currently do isn't the
> same as COMDAT for these purposes?
> 
I'm not sure I understand your question.  In earlier versions of G++,  both
vtables and typeinfo were  always emitted with linkonce semantics, because of
the MULTIPLE_SYMBOL_SPACES define.  

Regards
Danny


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40068