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This extension is a portability trap for users, since no other standard library supports it. Furthermore, the Standard explicitly allows implementations to reject std::allocator<cv T>, so allowing it is really going against the current. This was discovered in D120684: this extension required `const_cast`ing in `__construct_range_forward`, a fishy bit of code that can be removed if we don't support the extension anymore. This is a re-application of dbc647643577, which was reverted in 9138666f5 because it broke std::shared_ptr<T const>. Tests have now been added and we've made sure that std::shared_ptr<T const> wouldn't be broken in this version. Differential Revision: https://reviews.llvm.org/D120996
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.