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* Fix undefined symbol error around SharedCtor() Apparently, #8532 was incorrect if applied to 3.17.x branch. 3.17.x changed code generation to mark `SharedCtor()` and `SharedDtor()` as inline in .pb.cc. It looks like we have a compile-time undefined behavior in C++ now. As cppreference.com [says](https://en.cppreference.com/w/cpp/language/inline): _The definition of an inline function <...> must be reachable in the translation unit where it is accessed (not necessarily before the point of access)._ As protobuf allows custom plugins to generate custom code, there is no limitation on where SharedCtor couble be possible referenced from. In our case we have SharedCtor invoked from corresponding `.pb.h` code, thus triggering: ``` ld: error: undefined symbol: package::Message::SharedCtor()` >>> referenced by file.pb.h:$$$$ ``` If this patch is not applicable, I can take a look into changing the code generation, but doing this will be harder then removing _inline_. * Regenerate checked-in generated .pb.cc files
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