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Could you go in a bit more about how this is done?

The only way I can think of this working is if the symbols are exported in the lib file but not exposed in a header. Is that what you mean?

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That's part of it. The other half is that whenever you link the library, you get the current version of each symbol, so it's possible to change the behavior of a new version while preserving a bug-compatible previous version. There's an extensive mapping that provides the symbols for ranges of versions.

That's basically it, this might help: http://peeterjoot.com/2019/09/20/an-example-of-linux-glibc-s...

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