Any standards-required ``[[nodiscard]]`` applications in C++20 are now always enabled. Any extended applications
are now enabled by default and can be disabled by defining ``_LIBCPP_DISABLE_NODISCARD_EXT``.
+- ``_LIBCPP_VERSION`` was previously defined to e.g. ``15001`` to represent LLVM 15.0.01, but this value had been
+ left undocumented. Starting with LLVM 16, ``_LIBCPP_VERSION`` will contain the version of LLVM represented as
+ ``XXYYZZ``. In other words, ``_LIBCPP_VERSION`` is gaining a digit. This should not be an issue for existing
+ code, since using e.g. ``_LIBCPP_VERSION > 15000`` will still give the right answer now that ``_LIBCPP_VERSION``
+ is defined as e.g. ``160000`` (with one more digit).
+
ABI Affecting Changes
---------------------
- In freestanding mode, ``atomic<small enum class>`` does not contain a lock byte anymore if the platform
#ifdef __cplusplus
// _LIBCPP_VERSION represents the version of libc++, which matches the version of LLVM.
-// Given a LLVM release LLVM XX.Y.ZZ (e.g. LLVM 16.0.1 == 16.0.01), _LIBCPP_VERSION is
-// defined to XXYZZ.
-# define _LIBCPP_VERSION 16000
+// Given a LLVM release LLVM XX.YY.ZZ (e.g. LLVM 16.0.1 == 16.00.01), _LIBCPP_VERSION is
+// defined to XXYYZZ.
+# define _LIBCPP_VERSION 160000
# define _LIBCPP_CONCAT_IMPL(_X, _Y) _X##_Y
# define _LIBCPP_CONCAT(_X, _Y) _LIBCPP_CONCAT_IMPL(_X, _Y)