housel added a comment. It's also worth noting that FreeBSD's version of libgcc exception handling is actually based on the libunwind code, with a local patch <https://cgit.freebsd.org/src/tree/contrib/llvm-project/libunwind/src/UnwindLevel1-gcc-ext.c#n241> that implements compatibility with libgcc `__register_frame` by changing it to parse an entire `.eh_frame` section (in a slightly more ad hoc fashion than this code). Having this new entry point in-tree would simplify the FreeBSD local changes.
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