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aaa0b69577
Until now, attempting to create an alias of a required option would complain if the user supplied the alias, because the required option didn't have a value. Similarly, if you said the alias was required, then using the base option would complain that the alias wasn't supplied. Lastly, if you put required on both, *neither* option would work. By changning alias to overload addOccurrence and setting cl::Required on the original option, we can get this to behave in a more useful way. I've also added a test and updated a user that was getting this wrong. llvm-svn: 212986