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The following is a good description of the GCC mechanism for controlling symbol visibility - similar to declspec(dllexport) and declspec(dllimport) for those familiar with MSVC:

Unfortunately, using these features is problematic due to our dependence on dynamic_cast/type_info:

Apple appears to have a feature in their version of gcc that does exactly what we need:

It appears to have been adopted for future versions of mainstream gcc:

Here is an interesting alternative based on "Export Maps" - comparable to .DEF files for those familiar with MSVC:

Thinking wayyyyyyy outside the box, we might want to consider ditching dynamic_cast for some other form of RTTI, if we ever want to support distributed-memory architectures. Hate to say it, but we may have come full-circle back to COM or something similar ;)

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