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`LIBUNWIND_ENABLE_WERROR` defaults to `OFF` according to [CMakeLists.txt](https://github.com/llvm/llvm-project/blob/main/libunwind/CMakeLists.txt#L43).
libunwind Documentation ==================== The libunwind documentation is written using the Sphinx documentation generator. It is currently tested with Sphinx 1.1.3. To build the documents into html configure libunwind with the following cmake options: * -DLLVM_ENABLE_SPHINX=ON * -DLIBUNWIND_INCLUDE_DOCS=ON After configuring libunwind with these options the make rule `docs-libunwind-html` should be available.