| ***NOTE*** |
| |
| 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 marco. 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 need to recompile your code with |
| the old ABI,just like: |
| **g++ stringWrite.cpp -ljsoncpp -std=c++11 -D_GLIBCXX_USE_CXX11_ABI=0 -o stringWrite** |
| |
| Not all of uses of the new ABI will cause changes in symbol names, for example a class with a `std::string` member variable will |
| have the same mangled name whether compiled with the older or new ABI. In order to detect such problems, the new types and functions |
| are annotated with the abi_tag attribute, allowing the compiler to warn about potential ABI incompatibilities in code using them. |
| Those warnings can be enabled with the `-Wabi-tag` option. |
