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The -V option in cctools' libtool prints out the version number and performs any specified operation. Add this option to LLVM's version. cctools is more forgiving of invalid command lines when -V is specified, but I think it's better to give errors instead of silently producing no output. Unfortunately, when -V is present, options that would otherwise be required aren't anymore, so we need to perform some manual argument validation. Reviewed By: alexshap Differential Revision: https://reviews.llvm.org/D86359