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Diffstat (limited to 'example/README.md')
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diff --git a/example/README.md b/example/README.md new file mode 100644 index 0000000..b1ae4c8 --- /dev/null +++ b/example/README.md @@ -0,0 +1,13 @@ +***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. |