使用gcc 5 编译c++11编写的程序 出现的符号找不到的链接问题。

记录今天遇到的问题：

1. 使用c++11 写了一段c++程序，使用gcc 5.2编译。程序引用了非c++11编写的静态库

2. 链接时总是报某个函数找不到 但是使用nm命令查看，符号确实存在

经过google发现，原来gcc 5引入了新的ABI

https://gcc.gnu.org/onlinedocs/libstdc++/manual/using_dual_abi.html

If you get linker errors about undefined references to symbols that involve types in the std::__cxx11 namespace or the tag [abi:cxx11] then it probably indicates that you are trying to link together object files that were compiled with different values for the _GLIBCXX_USE_CXX11_ABI macro. This commonly happens when linking to a third-party library that was compiled with an older version of GCC. If the third-party library cannot be rebuilt with the new ABI then you will need to recompile your code with the old ABI.

对于我的问题，需要在参数上增加 -D_GLIBCXX_USE_CXX11_ABI=0 就解决了。