[libcxx-commits] [libcxx] [libc++] Deprecate the C++20 synchronization library before C++20 (PR #86410)

[Mark de Wever via libcxx-commits]

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@@ -55,6 +55,10 @@ Improvements and New Features
 Deprecations and Removals
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+- The C++20 synchronization library (``<barrier>``, ``<latch>``, ``atomic::wait``, etc.) has been deprecated
+  in language modes prior to C++20. If you are using these features prior to C++20, please update to ``-std=c++20``.
+  In LLVM 20, the C++20 synchronization library will be removed entirely in language modes prior to C++20.
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mordante wrote:

Don't we typically deprecate for 2 releases?

https://github.com/llvm/llvm-project/pull/86410