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Hi, The argument list for cl::values in command line library should be end with null or clEnumValEnd. But the tutorial page(http://llvm.org/docs/CommandLine.html <http://llvm.org/docs/CommandLine.html>) doesn’t follow the rule, which would cause program crash during runtime. I’d send a code review: https://reviews.llvm.org/D33861 <https://reviews.llvm.org/D33861> Please cc other