sangli00 opened a new issue #1732:
URL: https://github.com/apache/incubator-brpc/issues/1732
**Describe the bug (描述bug)**
Centos7.8 把GCC升级到7.5版本
编译brpc，gflags,leveldb,protobuffer都是编译的动态库。
> Linking protoc-gen-mcpack
g++ -o protoc-gen-mcpack -I./src -I/usr/include/ -I/usr/local/include/
-L/usr/lib64 -L/usr/local/lib -L/usr/local/lib64 -std=c++0x -Xlinker "-("
src/idl_options.pb.cc src/mcpack2pb/generator.o libbrpc.a -Wl,-Bstatic
-lprotobuf -lprotoc -Wl,-Bdynamic -Xlinker "-)" -lpthread -lssl -lcrypto -ldl
-lz -lrt -lgflags -lleveldb
> Copying to output/lib
libbrpc.a(logging.o)：在函数‘__static_initialization_and_destruction_0’中：
/data/build_mysql_8.0/brpc/src/butil/logging.cc:126：对‘google::FlagRegisterer::FlagRegisterer<std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> > >(char const*, char const*,
char const*, std::__cxx11::basic_string<char, std::char_traits<char>,
std::allocator<char> >*, std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> >*)’未定义的引用
/data/build_mysql_8.0/brpc/src/butil/logging.cc:1471：对‘google::RegisterFlagValidator(std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> > const*, bool (*)(char const*,
std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >
const&))’未定义的引用
libbrpc.a(variable.o)：在函数‘bvar::dumping_thread(void*)’中：
/data/build_mysql_8.0/brpc/src/bvar/variable.cpp:705：对‘google::GetCommandLineOption(char
const*, std::__cxx11::basic_string<char, std::char_traits<char>,
std::allocator<char> >*)’未定义的引用
/data/build_mysql_8.0/brpc/src/bvar/variable.cpp:709：对‘google::GetCommandLineOption(char
const*, std::__cxx11::basic_string<char, std::char_traits<char>,
std::allocator<char> >*)’未定义的引用
/data/build_mysql_8.0/brpc/src/bvar/variable.cpp:714：对‘google::GetCommandLineOption(char
const*, std::__cxx11::basic_string<char, std::char_traits<char>,
std::allocator<char> >*)’未定义的引用
/data/build_mysql_8.0/brpc/src/bvar/variable.cpp:719：对‘google::GetCommandLineOption(char
const*, std::__cxx11::basic_string<char, std::char_traits<char>,
std::allocator<char> >*)’未定义的引用
/data/build_mysql_8.0/brpc/src/bvar/variable.cpp:723：对‘google::GetCommandLineOption(char
const*, std::__cxx11::basic_string<char, std::char_traits<char>,
std::allocator<char> >*)’未定义的引用
libbrpc.a(variable.o)：在函数‘__static_initialization_and_destruction_0’中：
/data/build_mysql_8.0/brpc/src/bvar/variable.cpp:674：对‘google::FlagRegisterer::FlagRegisterer<std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> > >(char const*, char const*,
char const*, std::__cxx11::basic_string<char, std::char_traits<char>,
std::allocator<char> >*, std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> >*)’未定义的引用
/data/build_mysql_8.0/brpc/src/bvar/variable.cpp:675：对‘google::FlagRegisterer::FlagRegisterer<std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> > >(char const*, char const*,
char const*, std::__cxx11::basic_string<char, std::char_traits<char>,
std::allocator<char> >*, std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> >*)’未定义的引用
/data/build_mysql_8.0/brpc/src/bvar/variable.cpp:677：对‘google::FlagRegisterer::FlagRegisterer<std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> > >(char const*, char const*,
char const*, std::__cxx11::basic_string<char, std::char_traits<char>,
std::allocator<char> >*, std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> >*)’未定义的引用
/data/build_mysql_8.0/brpc/src/bvar/variable.cpp:679：对‘google::FlagRegisterer::FlagRegisterer<std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> > >(char const*, char const*,
char const*, std::__cxx11::basic_string<char, std::char_traits<char>,
std::allocator<char> >*, std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> >*)’未定义的引用
/data/build_mysql_8.0/brpc/src/bvar/variable.cpp:680：对‘google::FlagRegisterer::FlagRegisterer<std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> > >(char const*, char const*,
char const*, std::__cxx11::basic_string<char, std::char_traits<char>,
std::allocator<char> >*, std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> >*)’未定义的引用
/data/build_mysql_8.0/brpc/src/bvar/variable.cpp:825：对‘google::RegisterFlagValidator(std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> > const*, bool (*)(char const*,
std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >
const&))’未定义的引用
/data/build_mysql_8.0/brpc/src/bvar/variable.cpp:827：对‘google::RegisterFlagValidator(std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> > const*, bool (*)(char const*,
std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >
const&))’未定义的引用
/data/build_mysql_8.0/brpc/src/bvar/variable.cpp:829：对‘google::RegisterFlagValidator(std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> > const*, bool (*)(char const*,
std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >
const&))’未定义的引用
/data/build_mysql_8.0/brpc/src/bvar/variable.cpp:831：对‘google::RegisterFlagValidator(std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> > const*, bool (*)(char const*,
std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >
const&))’未定义的引用
/data/build_mysql_8.0/brpc/src/bvar/variable.cpp:833：对‘google::RegisterFlagValidator(std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> > const*, bool (*)(char const*,
std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >
const&))’未定义的引用
libbrpc.a(gflag.o)：在函数‘bvar::GFlag::get_value[abi:cxx11]() const’中：
/data/build_mysql_8.0/brpc/src/bvar/gflag.cpp:81：对‘google::GetCommandLineOption(char
const*, std::__cxx11::basic_string<char, std::char_traits<char>,
std::allocator<char> >*)’未定义的引用
libbrpc.a(gflag.o)：在函数‘bvar::GFlag::set_value(char const*)’中：
/data/build_mysql_8.0/brpc/src/bvar/gflag.cpp:88：对‘google::SetCommandLineOption[abi:cxx11](char
const*, char const*)’未定义的引用
collect2: 错误：ld 返回 1
make: *** [protoc-gen-mcpack] 错误 1
**To Reproduce (复现方法)**
**Expected behavior (期望行为)**
成功
**Versions (各种版本)**
OS:Centos7.8
Compiler:GCC 7.5
brpc:最新release
protobuf:3.13.0
**Additional context/screenshots (更多上下文/截图)**
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