[libc++] Update status after Varna meeting.

This updates:
- The status tables
- Feature test macros
- New headers for modules
The latter avoids forgetting about modules when implementing the feature
in a new header.

Reviewed By: #libc, philnik

Differential Revision: https://reviews.llvm.org/D153192

1 files changed, 26 insertions, 0 deletions

diff --git a/libcxx/modules/std/text_encoding.cppm b/libcxx/modules/std/text_encoding.cppm
new file mode 100644
index 0000000..dcbaa73
--- /dev/null
+++ b/libcxx/modules/std/text_encoding.cppm
@@ -0,0 +1,26 @@
+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#if __has_include(<text_encoding>)
+#  error "include this header unconditionally and uncomment the exported symbols"
+#  include <text_encoding>
+#endif
+
+export module std:text_encoding;
+export namespace std {
+#if 0
+#  if _LIBCPP_STD_VER >= 23
+  using std::text_encoding;
+
+  // hash support
+  using std::hash;
+#  endif // _LIBCPP_STD_VER >= 23
+#endif
+} // namespace std