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[P2845R8](https://wg21.link/P2845R8) "Formatting of `std::filesystem::path`" and [P2587R3](https://wg21.link/P2587R3) "`to_string` or not `to_string`" are C++26 features, so they should be marked accordingly in `generate_feature_test_macro_components.py`. I verified that without my changes, running the script produced no edits. Then with my changes, I ran the script to regenerate all files, with no other manual edits. Found while running libc++'s tests with MSVC's STL, which noticed this because it's currently a C++23-only implementation. Note that @H-G-Hristov has a draft implementation of P2587R3: #78100
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.