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In C++20 mode, `__cpp_lib_optional` and `__cpp_lib_variant` should be `202106L` due to DR P2231R1. In C++26 mode, `__cpp_lib_variant` should be bumped to `202306L` due to P2637R3. - Clang 16/17 shouldn't get this bumping (as member `visit` requires explicit object parameters), but it's very tricky to make the bumping conditionally enabled. I _hope_ unconditionally bumping in C++26 will be OK for LLVM 20 when the support for Clang 17 is dropped. Related PRs: - https://reviews.llvm.org/D102119 - #83335 - #76447
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.