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This effort has quite a history: - This was first attempted in 2022 via bed3240bf7d1, which broke std::shared_ptr<T const> and caused the change to be reverted in 9138666f5464. - We then re-attempted landing the change in 276ca87382b8 after fixing std::shared_ptr, but reports were made that this broke code en masse within Google. This led to the patch being reverted again in a54d028895c9 with the goal to land this again with a migration path for vendors. This patch re-lands the removal while providing a migration path for vendors by providing the `_LIBCPP_ENABLE_REMOVED_ALLOCATOR_CONST` macro. This macro will be honored for the LLVM 19 release and will be removed after that, at which point allocator<const T> will be removed unconditionally. Fixes #73665
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.