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GNU ld supports most long options with either one or two dashes. For compatibility, lld has to support both. For newer and lld specific options, we don't have such compatibility problem. I'd suggest we reject one-dash long options to avoid collision with short options. For example, * -lto-emit-obj can be read as -l to-emit-obj * -thinlto-cache-dir= means -t -h inlto-cache-dir= in GNU