supernear opened a new issue, #2371: URL: https://github.com/apache/brpc/issues/2371
**Describe the bug (描述bug)** [ 94%] Linking CXX executable ../output/bin/protoc-gen-mcpack ../output/lib/libbrpc.a(logging.cc.o): In function `__static_initialization_and_destruction_0': /home/opensource/brpc/src/butil/logging.cc:127: undefined reference to `google::FlagRegisterer::FlagRegisterer<std::string>(char const*, char const*, char const*, std::string*, std::string*)' /home/opensource/brpc/src/butil/logging.cc:1595: undefined reference to `google::RegisterFlagValidator(std::string const*, bool (*)(char const*, std::string const&))' ../output/lib/libbrpc.a(variable.cpp.o): In function `bvar::dumping_thread(void*)': /home/opensource/brpc/src/bvar/variable.cpp:743: undefined reference to `google::GetCommandLineOption(char const*, std::string*)' /home/opensource/brpc/src/bvar/variable.cpp:747: undefined reference to `google::GetCommandLineOption(char const*, std::string*)' /home/opensource/brpc/src/bvar/variable.cpp:752: undefined reference to `google::GetCommandLineOption(char const*, std::string*)' /home/opensource/brpc/src/bvar/variable.cpp:757: undefined reference to `google::GetCommandLineOption(char const*, std::string*)' /home/opensource/brpc/src/bvar/variable.cpp:761: undefined reference to `google::GetCommandLineOption(char const*, std::string*)' ../output/lib/libbrpc.a(variable.cpp.o):/home/opensource/brpc/src/bvar/variable.cpp:767: more undefined references to `google::GetCommandLineOption(char const*, std::string*)' follow ../output/lib/libbrpc.a(variable.cpp.o): In function `__static_initialization_and_destruction_0': /home/opensource/brpc/src/bvar/variable.cpp:700: undefined reference to `google::FlagRegisterer::FlagRegisterer<std::string>(char const*, char const*, char const*, std::string*, std::string*)' /home/opensource/brpc/src/bvar/variable.cpp:701: undefined reference to `google::FlagRegisterer::FlagRegisterer<std::string>(char const*, char const*, char const*, std::string*, std::string*)' /home/opensource/brpc/src/bvar/variable.cpp:703: undefined reference to `google::FlagRegisterer::FlagRegisterer<std::string>(char const*, char const*, char const*, std::string*, std::string*)' /home/opensource/brpc/src/bvar/variable.cpp:705: undefined reference to `google::FlagRegisterer::FlagRegisterer<std::string>(char const*, char const*, char const*, std::string*, std::string*)' /home/opensource/brpc/src/bvar/variable.cpp:706: undefined reference to `google::FlagRegisterer::FlagRegisterer<std::string>(char const*, char const*, char const*, std::string*, std::string*)' ../output/lib/libbrpc.a(variable.cpp.o):/home/opensource/brpc/src/bvar/variable.cpp:716: more undefined references to `google::FlagRegisterer::FlagRegisterer<std::string>(char const*, char const*, char const*, std::string*, std::string*)' follow ../output/lib/libbrpc.a(variable.cpp.o): In function `__static_initialization_and_destruction_0': /home/opensource/brpc/src/bvar/variable.cpp:912: undefined reference to `google::RegisterFlagValidator(std::string const*, bool (*)(char const*, std::string const&))' /home/opensource/brpc/src/bvar/variable.cpp:914: undefined reference to `google::RegisterFlagValidator(std::string const*, bool (*)(char const*, std::string const&))' /home/opensource/brpc/src/bvar/variable.cpp:916: undefined reference to `google::RegisterFlagValidator(std::string const*, bool (*)(char const*, std::string const&))' /home/opensource/brpc/src/bvar/variable.cpp:918: undefined reference to `google::RegisterFlagValidator(std::string const*, bool (*)(char const*, std::string const&))' /home/opensource/brpc/src/bvar/variable.cpp:920: undefined reference to `google::RegisterFlagValidator(std::string const*, bool (*)(char const*, std::string const&))' ../output/lib/libbrpc.a(variable.cpp.o):/home/opensource/brpc/src/bvar/variable.cpp:925: more undefined references to `google::RegisterFlagValidator(std::string const*, bool (*)(char const*, std::string const&))' follow ../output/lib/libbrpc.a(gflag.cpp.o): In function `bvar::GFlag::get_value() const': /home/opensource/brpc/src/bvar/gflag.cpp:81: undefined reference to `google::GetCommandLineOption(char const*, std::string*)' ../output/lib/libbrpc.a(gflag.cpp.o): In function `bvar::GFlag::set_value(char const*)': /home/opensource/brpc/src/bvar/gflag.cpp:88: undefined reference to `google::SetCommandLineOption(char const*, char const*)' collect2: error: ld returned 1 exit status make[2]: *** [output/bin/protoc-gen-mcpack] Error 1 make[1]: *** [src/CMakeFiles/protoc-gen-mcpack.dir/all] Error 2 make: *** [all] Error 2 **To Reproduce (复现方法)** mkdir -p build cd build cmake ../ /usr/lib/libgflags.a /usr/lib64/libgflags.a /usr/local/lib/libgflags.a /usr/lib64/libgflags.so /usr/local/lib/libgflags.so /home/tools/gflags-v2.2.2/build/lib/libgflags.so /usr/lib/libglog.a /usr/lib64/libglog.a /usr/local/lib/libglog.a /usr/local/lib64/libglog.a /home/tools/glog/build/libglog.a /usr/lib64/libglog.so /usr/local/lib/libglog.so /usr/local/lib64/libglog.so /home/tools/glog/build/libglog.so **Expected behavior (期望行为)** 可以正常编译通过 **Versions (各种版本)** OS:CentOS Linux release 7.9.2009 (Core) Compiler:g++ (GCC) 8.3.0 gcc (GCC) 8.3.0 brpc: brpc.1.6.0 protobuf: libprotoc 2.5.0 **Additional context/screenshots (更多上下文/截图)**  -- This is an automated message from the Apache Git Service. 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