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Once the plugin is built, you can run it using:

$ clang <-g -Wall ...> -Xclang -load -Xclang /home/simshi/llvm/x86/lib/libFunctionFanout.so -Xclang -add-plugin -Xclang func-fanout <input_file>
$ clang <-g -Wall ...> -Xclang -load -Xclang /home/simshi/llvm/x86/lib/libFunctionFanout.so -Xclang -plugin -Xclang func-fanout <input_file>
$ clang <-g -Wall ...> -Xclang -load -Xclang /home/simshi/llvm/x86/lib/libFunctionFanout.so -Xclang -add-plugin -Xclang func-fanout -Xclang -plugin-arg-func-fanout -Xclang help <input_file>