rsmith added a comment.

In https://reviews.llvm.org/D46665#1102413, @efriedma wrote:

> What exactly is the asan odr checker actually checking for?  The distinction 
> between common/linkonce_odr/linkonce/weak_odr/weak only affects IR 
> optimizers, not code generation.


It's checking that there is only one definition of each global variable for 
which only one definition is expected; it believes that if there is an 
`external` definition, then there should not be any other definitions.


Repository:
  rC Clang

https://reviews.llvm.org/D46665



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