[I] Gflags 解析报错：ERROR: --bthread_concurrency_by_tag must be set on the commandline (default value fails validation) (brpc)

[via GitHub]

yanbinyang opened a new issue, #2542:
URL: https://github.com/apache/brpc/issues/2542

   **Describe the bug (描述bug)**
   
   
   
   **To Reproduce (复现方法)**
   
   魔改 echo_c++ 中的 server.cpp
   ```
   int main(int argc, char* argv[]) {
       // Parse gflags. We recommend you to use gflags as well.
       GFLAGS_NS::ParseCommandLineFlags(&argc, &argv, true);
   
       // Parse gflags Again.
       GFLAGS_NS::AllowCommandLineReparsing();
       GFLAGS_NS::SetArgv(argc, (const char**) argv);
       GFLAGS_NS::ReparseCommandLineNonHelpFlags();
   
       std::string endpoint = "127.0.0.1:8010";
       butil::EndPoint ep;
       str2endpoint(endpoint.c_str(), &ep);
       brpc::Server server;
       EchoServiceImpl echo_svc;
       server.AddService(&echo_svc, brpc::SERVER_DOESNT_OWN_SERVICE);
   
       server.Start(ep, NULL);
   
       // Wait until Ctrl-C is pressed, then Stop() and Join() the server.
       server.RunUntilAskedToQuit();
       return 0;
   }
   ```
   
   
   **Expected behavior (期望行为)**
   正常启动，但报错ERROR: --bthread_concurrency_by_tag must be set on the commandline 
(default value fails validation)
   
   **Versions (各种版本)**
   OS: macos/linux
   Compiler: g++10.4
   brpc: 1.8.0
   protobuf: 3.x
   
   **Additional context/screenshots (更多上下文/截图)**
   
![image](https://github.com/apache/brpc/assets/2880762/9af600e7-cfa7-478c-985c-54c89b7d1314)
   
   


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