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This significantly simplifies the code, improves compile times and improves the object layout of types using `__compressed_pair` in the unstable ABI. The only downside is that this is extremely ABI sensitive and pedantically breaks the ABI for empty final types, since the address of the subobject may change. The ABI of the whole object should not be affected. Fixes #91266 Fixes #93069
libc++ Documentation ==================== The libc++ documentation is written using the Sphinx documentation generator. It is currently tested with Sphinx 1.1.3. To build the documents into html configure libc++ with the following cmake options: * -DLLVM_ENABLE_SPHINX=ON * -DLIBCXX_INCLUDE_DOCS=ON After configuring libc++ with these options the make rule `docs-libcxx-html` should be available. The documentation in this directory is published at https://libcxx.llvm.org. It is kept up-to-date by a build bot: https://lab.llvm.org/buildbot/#/builders/publish-sphinx-docs. If you notice that the documentation is not updating anymore, please contact one of the maintainers.