martong added a comment.

> should we add this new declaration to the redeclaration chain like we do it 
> for RecordDecls?

I think, on a long term we should. Otherwise we could loose e.g. C++11 
attributes which are attached to the forward declaration only.
However, I'd do that as a separate commit, because that would require some 
independent changes and tests, also other decl kinds like 
ClassTemplateSepcializationDecl may be affected as well by that.


Repository:
  rC Clang

https://reviews.llvm.org/D46353



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