[PATCH] D144889: [C2x] Support <string.h> in freestanding

[Aaron Ballman via Phabricator via cfe-commits]

aaron.ballman created this revision.
aaron.ballman added reviewers: clang-language-wg, jyknight, efriedma, joerg.
Herald added a project: All.
aaron.ballman requested review of this revision.
Herald added a project: clang.

This implements most of the support for WG14 N2524 (https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2524.htm), which adds `<string.h>` to the list of headers required by a freestanding implementation.

We do not currently have builtins for `memccpy`, `memset_explicit`, or `strtok`, so those APIs are not yet exposed via our freestanding `string.h`. Further, we do not yet implement WG14 N3020 which changes the return type for some of the interfaces in string.h. So this patch does not claim full support for string.h yet (it adds the `__STDC_VERSION_STRING_H__` macro but leaves its value as `202300L` instead of `202311L` as required by the standard).


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D144889

Files:
  clang/docs/ReleaseNotes.rst
  clang/lib/Headers/CMakeLists.txt
  clang/lib/Headers/string.h
  clang/lib/Lex/ModuleMap.cpp
  clang/test/C/C2x/n2524.c
  clang/www/c_status.html

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