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With the CommandLine library, is there a way to specify that one of two options must be present? I have two parameters, -if and -od. I want an error if neither is present or if both are present. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20160404/dbae63e0/attachment.html>