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As described in #69994, using the escape hatch makes us non-conforming in C++20 due to incorrect constexpr-ness. It also leads to bad diagnostics as reported by #63900. We discussed the issue in the libc++ monthly meeting and we agreed that we should deprecate the macro in LLVM 18, and then remove it in LLVM 19 since it causes too many problems. This patch does the first part of this -- it deprecates the macro. Fixes #69994 Fixes #63900 Partially addresses #75975
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.