[libc++][cuchar] Declare std::c8rtomb and std::mbrtoc8 in <cuchar> if available.
This change implements the C library dependent portions of P0482R6
(char8_t: A type for UTF-8 characters and strings (Revision 6)) by
declaring std::c8rtomb() and std::mbrtoc8() in the <cuchar> header
when implementations are provided by the C library as specified by
WG14 N2653 (char8_t: A type for UTF-8 characters and strings
(Revision 1)) as adopted for C23.
A _LIBCPP_HAS_NO_C8RTOMB_MBRTOC8 macro is defined by the libc++ __config
header unless it is known that the C library provides these functions
in the current compilation mode. This macro is used for testing purposes
and may be of use to libc++ users. At present, the only C library known
to implement these functions is GNU libc as of its 2.36 release.
Reviewed By: ldionne
Differential Revision: https://reviews.llvm.org/D130946
NOKEYCHECK=True
GitOrigin-RevId: 7e7013c5d4b1b3996c8dba668c5a94bb33b2999b
diff --git a/docs/ReleaseNotes.rst b/docs/ReleaseNotes.rst
index 9c46642..f745a77 100644
--- a/docs/ReleaseNotes.rst
+++ b/docs/ReleaseNotes.rst
@@ -44,6 +44,9 @@
Improvements and New Features
-----------------------------
+- Declarations of ``std::c8rtomb()`` and ``std::mbrtoc8()`` from P0482R6 are
+ now provided when implementations in the global namespace are provided by
+ the C library.
Deprecations and Removals
-------------------------
diff --git a/docs/Status/Cxx20.rst b/docs/Status/Cxx20.rst
index 43d29c5..90f2acc 100644
--- a/docs/Status/Cxx20.rst
+++ b/docs/Status/Cxx20.rst
@@ -49,6 +49,8 @@
.. [#note-P0883.1] P0883: shared_ptr and floating-point changes weren't applied as they themselves aren't implemented yet.
.. [#note-P0883.2] P0883: ``ATOMIC_FLAG_INIT`` was marked deprecated in version 14.0, but was undeprecated with the implementation of LWG3659 in version 15.0.
.. [#note-P2231] P2231: Optional is complete. The changes to variant haven't been implemented yet.
+ .. [#note-P0482] P0482: Declarations of ``std::pmr::u8string`` and ``std::hash<std::pmr::u8string>`` are blocked pending implementation
+ of polymorphic allocator support from P0220.
.. _issues-status-cxx20:
diff --git a/docs/Status/Cxx20Papers.csv b/docs/Status/Cxx20Papers.csv
index f9c58b2..ed1d0ce 100644
--- a/docs/Status/Cxx20Papers.csv
+++ b/docs/Status/Cxx20Papers.csv
@@ -53,7 +53,7 @@
"`P0318R1 <https://wg21.link/P0318R1>`__","LWG","unwrap_ref_decay and unwrap_reference","San Diego","|Complete|","8.0"
"`P0356R5 <https://wg21.link/P0356R5>`__","LWG","Simplified partial function application","San Diego","|Complete|","13.0"
"`P0357R3 <https://wg21.link/P0357R3>`__","LWG","reference_wrapper for incomplete types","San Diego","|Complete|","8.0"
-"`P0482R6 <https://wg21.link/P0482R6>`__","CWG","char8_t: A type for UTF-8 characters and strings","San Diego","|In Progress|",""
+"`P0482R6 <https://wg21.link/P0482R6>`__","CWG","char8_t: A type for UTF-8 characters and strings","San Diego","|Partial| [#note-P0482]_","16.0"
"`P0487R1 <https://wg21.link/P0487R1>`__","LWG","Fixing ``operator>>(basic_istream&, CharT*)``\ (LWG 2499)","San Diego","|Complete|","8.0"
"`P0591R4 <https://wg21.link/P0591R4>`__","LWG","Utility functions to implement uses-allocator construction","San Diego","* *",""
"`P0595R2 <https://wg21.link/P0595R2>`__","CWG","P0595R2 std::is_constant_evaluated()","San Diego","|Complete|","9.0"