jamieschmeiser added a comment.

@rsmith I separated the C and C++ messages in response to your comments and 
changed the C++ message to state that "performing pointer subtraction with a 
null pointer may have undefined behavior" to address your concerns.  Are you 
satisfied?  @thakis, the warning no longer fires in the MS headers according to 
@hans and there is separate option control over this warning.  Is this 
sufficient?  @efriedma, thank you for reviewing/approving the original but 
these changes were sufficiently different that I thought a new review would be 
beneficial.  Are you still satisfied with the resulting changes?


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D98798/new/

https://reviews.llvm.org/D98798

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