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Prior to setting up logging, we have uses of RNBLogSTDERR and RNBLogSTDOUT. These macros will dump to STDERR and STDOUT respectively if debugserver has a tty. Otherwise, it uses _DNBLog, which will do nothing if a logging function hasn't been set up. For example, if you specify a log file that cannot be opened for any reason and you don't have a tty, you have 0 insight into what happened. rdar://105473133 Differential Revision: https://reviews.llvm.org/D144142