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This completes the implementation of P1065 "constexpr INVOKE": http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1065r2.html This doesn't yet complete the implementation of P1032 "Misc constexpr bits," http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1032r1.html but it does complete all of the <functional> bits, which means that we can now set `__cpp_lib_constexpr_functional` for C++20. This could use more constexpr tests for `std::reference_wrapper<T>`, but the existing tests are extremely non-constexpr-friendly and so I don't want to get into that rabbit-hole today. Differential Revision: https://reviews.llvm.org/D93815
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.