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Figuring out which classes are part of the public API by using library symbols is fragile (dependent on specific compiler optimizations) and unreliable (misses some inline things). Instead, use castxml, a tool that parses C++ to an abstract syntax tree and generates XML, to get a reliable accounting of public classes and their sizes.
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Otherwise we get errors if we added a class.
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GNU grep 3.8 started to emit warnings when invoking egrep. Convert all calls to grep -E.
