efriedma added subscribers: cfe-commits, efriedma.
efriedma added a comment.

Adding cfe-commits.  (In the future, please make sure to CC that list instead 
of llvm-commits for clang changes.)

> I'm missing some background lingo here. What is the meaning of "a 
> declaration" and "a definition" here?

In most cases, we only emit the vtable for a class in one object file.  
Informally, we can call that the "definition" of the vtable, as an analogy to 
variables and functions.  See also 
http://itanium-cxx-abi.github.io/cxx-abi/abi.html#vague-vtable .


Repository:
  rL LLVM

https://reviews.llvm.org/D39627



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