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



------- Comment #7 from dave dot korn dot cygwin at gmail dot com  2009-06-25 15:37 -------
  Hmm, I'm getting somewhere with this.

  By compiling the g++ testsuite "ptrflags.C" case with --save-temps, manually
hacking all the superfluous typeinfo stuff out, and re-assembling and linking
it, I can turn a FAIL into a PASS, with all the typeinfo and related stuff
being imported from the DLL.

  So I think typeinfo can be made to work, and work with both
__GXX_MERGED_TYPEINFO_NAMES and __GXX_TYPEINFO_EQUALITY_INLINE.

  All I need to do is stop the compiler from emitting comdat definitions of
items with vague linkage when they are dllimported, or perhaps make the linker
prefer an import over a comdat section when the same symbol could be resolved
by either.  Or perhaps both.  I think the linker fix is what you were
suggesting when you said

> since if we depend on auto-import than
> we should treat dll imports thae same as static lib imports

  More later.


-- 


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


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