<p>Say I'm talking to someone who believes the clang libunwind and gcc libunwind are API incompatible.</p><p>I'm fairly certain this is incorrect. But I can't *prove* it.</p><p>The GCC libunwind docs are here. It lists all these unw_ functions. <a href="https://www.nongnu.org/libunwind/docs.html" target="_blank" rel="nofollow noopener" translate="no"><span class="invisible">https://www.</span><span class="">nongnu.org/libunwind/docs.html</span><span class="invisible"></span></a></p><p>The clang libunwind docs are here <a href="https://bcain-llvm.readthedocs.io/projects/libunwind/en/latest/" target="_blank" rel="nofollow noopener" translate="no"><span class="invisible">https://</span><span class="ellipsis">bcain-llvm.readthedocs.io/proj</span><span class="invisible">ects/libunwind/en/latest/</span></a> and they areā¦ 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.</p>