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Say I'm talking to someone who believes the clang libunwind and gcc libunwind are API incompatible.

I'm fairly certain this is incorrect. But I can't *prove* it.

The GCC libunwind docs are here. It lists all these unw_ functions. https://www.nongnu.org/libunwind/docs.html

The clang libunwind docs are here https://bcain-llvm.readthedocs.io/projects/libunwind/en/latest/ and they are… build instructions. Nothing else. It describes itself as implementing "the HP libunwind interface". Google doesn't find such a thing and I don't think HP-UX is supported.