108   auto& ofs = std::cerr;  in usage()  local
110   ofs << "Usage: " << prog << " [OPTIONS] file1 file2..." << std::endl;  in usage()
112   ofs << std::setw(24) << "--out= ";  in usage()
113   ofs << "Root directory for generated output (relative to cwd)." << std::endl;  in usage()
115   ofs << std::setw(24) << "--include= ";  in usage()
116   ofs << "Generate namespaces relative to this path per file." << std::endl;  in usage()
118   ofs << std::setw(24) << "--root_namespace= ";  in usage()
119   ofs << "Change root namespace (default = bluetooth)." << std::endl;  in usage()
121   ofs << std::setw(24) << "--source_root= ";  in usage()
122   ofs << "Root path to the source directory. Find input files relative to this." << std::endl;  in usage()
124   ofs << std::setw(24) << "--num_shards= ";  in usage()
125   ofs << "Number of shards per output pybind11 cc file." << std::endl;  in usage()