Update __cplusplus for C++23, add C++23 diag group alias.
authorErich Keane <erich.keane@intel.com>
Mon, 15 May 2023 14:09:07 +0000 (07:09 -0700)
committerErich Keane <erich.keane@intel.com>
Mon, 15 May 2023 14:48:52 +0000 (07:48 -0700)
commitba9eaf59a8a3bb0713956da3bfb3492669971a62
treefd8478ab68cf3aea1af84cb59b17bfe59648b0fe
parentb0f0dd2554c726e5192ad8c98fb7a2f08c37994c
Update __cplusplus for C++23, add C++23 diag group alias.

This came up during the C++26 flag discussion, so split this out into a
separate patch.
clang/include/clang/Basic/DiagnosticGroups.td
clang/lib/Frontend/InitPreprocessor.cpp
clang/test/Preprocessor/init.c