2021-01-09 22:39:07 -06:00
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***NOTE***
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2019-09-18 04:30:00 +08:00
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If you get linker errors about undefined references to symbols that involve types in the `std::__cxx11` namespace or the tag
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`[abi:cxx11]` then it probably indicates that you are trying to link together object files that were compiled with different
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2021-01-09 22:39:07 -06:00
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values for the _GLIBCXX_USE_CXX11_ABI marco. This commonly happens when linking to a third-party library that was compiled with
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2019-09-18 04:30:00 +08:00
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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
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the old ABI,just like:
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**g++ stringWrite.cpp -ljsoncpp -std=c++11 -D_GLIBCXX_USE_CXX11_ABI=0 -o stringWrite**
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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
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have the same mangled name whether compiled with the older or new ABI. In order to detect such problems, the new types and functions
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are annotated with the abi_tag attribute, allowing the compiler to warn about potential ABI incompatibilities in code using them.
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Those warnings can be enabled with the `-Wabi-tag` option.
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