Kegem0 commented on issue #2356:
URL: https://github.com/apache/brpc/issues/2356#issuecomment-1675191511
继续做一个排列组合，我在自己的机器上，用centos默认yum
install下载的依赖，并且直接将gcc升级到8.3.0，clean之后重新make，弹出来的错误是protobuf和gflags的undefined
reference的问题，截取一段如下：
/home/ym/apache-brpc-1.6.0-src/src/bvar/variable.cpp:920: undefined
reference to `gflags::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&))'
libbrpc.a(variable.o):/home/ym/apache-brpc-1.6.0-src/src/bvar/variable.cpp:925:
more undefined references to
`gflags::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&))' follow
libbrpc.a(gflag.o): In function `bvar::GFlag::get_value[abi:cxx11]() const':
/home/ym/apache-brpc-1.6.0-src/src/bvar/gflag.cpp:81: undefined reference to
`gflags::GetCommandLineOption(char const*, std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> >*)'
libbrpc.a(gflag.o): In function `bvar::GFlag::set_value(char const*)':
/home/ym/apache-brpc-1.6.0-src/src/bvar/gflag.cpp:88: undefined reference to
`gflags::SetCommandLineOption[abi:cxx11](char const*, char const*)'
/home/ym/apache-brpc-1.6.0-src/src/bvar/variable.cpp:920: undefined
reference to `gflags::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&))'
libbrpc.a(variable.o):/home/ym/apache-brpc-1.6.0-src/src/bvar/variable.cpp:925:
more undefined references to
`gflags::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&))' follow
libbrpc.a(gflag.o): In function `bvar::GFlag::get_value[abi:cxx11]() const':
/home/ym/apache-brpc-1.6.0-src/src/bvar/gflag.cpp:81: undefined reference to
`gflags::GetCommandLineOption(char const*, std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> >*)'
libbrpc.a(gflag.o): In function `bvar::GFlag::set_value(char const*)':
/home/ym/apache-brpc-1.6.0-src/src/bvar/gflag.cpp:88: undefined reference to
`gflags::SetCommandLineOption[abi:cxx11](char const*, char const*)'
这个我在社区好像看到过，是 我在Makefile中加上了这一句
-D_GLIBCXX_USE_CXX11_ABI=0（CXXFLAGS或者CPPFLAGS后应该都行）最后编译成功。不过似乎-D_GLIBCXX_USE_CXX11_ABI=0这个行为并不好，高版本之所以将其抛弃也是其不安全性。这里属于是对编译成功的一种妥协了。
然后尝试编译这个简单样例
```shell
cd example/echo_c++
make
```
make的时候依然报类似的错误：
/home/ym/apache-brpc-1.6.0-src/example/echo_c++/../../output/include/butil/class_name.h:35:
undefined reference to `butil::demangle[abi:cxx11](char const*)'
/home/ym/apache-brpc-1.6.0-src/example/echo_c++/../../output/include/butil/class_name.h:35:
undefined reference to `butil::demangle[abi:cxx11](char const*)'
/home/ym/apache-brpc-1.6.0-src/example/echo_c++/../../output/include/butil/class_name.h:35:
undefined reference to `butil::demangle[abi:cxx11](char const*)'
server.o: In function `__static_initialization_and_destruction_1':
/home/ym/apache-brpc-1.6.0-src/example/echo_c++/../../output/include/butil/class_name.h:35:
undefined reference to `butil::demangle[abi:cxx11](char const*)'
当然是同样的操作（ABI=0），这里就发现这种方式很不方便了，yum
install默认下载的包都是旧的GCC版本编译的，而我们现在用旧的GCC版本没法编译brpc（而这个问题又仅仅出现在centos上，我的unbuntu系统又运行正常），这就产生了冲突。然后编译通过，执行样例
```shell
./echo_server & ./echo_client
```
当然不会成功，报错如下
./echo_server: /lib64/libstdc++.so.6: version `GLIBCXX_3.4.23' not found
(required by ./echo_server)
./echo_server: /lib64/libstdc++.so.6: version `CXXABI_1.3.8' not found
(required by ./echo_server)
./echo_server: /lib64/libstdc++.so.6: version `GLIBCXX_3.4.21' not found
(required by ./echo_server)
./echo_server: /lib64/libstdc++.so.6: version `GLIBCXX_3.4.20' not found
(required by ./echo_server)
看起来它还是找的系统默认路径下libstdc++.so.6，为了维护我把gcc8.3.0下载到了/usr/local/gcc8.3.0，不过估计我下到/usr/local也没用，他又不会覆盖掉默认路径。
我把我的gcc8.3.0下的lib64的libstdc++.so.6拷贝到了默认路径下/usr/lib64，之后运行成功，取得阶段性胜利了属于是。
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