[libcxx-commits] [libcxx] [libc++] stddef.h needs to #include_next for the new clang __need_ macros (PR #86252)

[Aaron Ballman via libcxx-commits]

================
@@ -7,16 +7,27 @@
 //
 //===----------------------------------------------------------------------===//
 
-#if defined(__need_ptrdiff_t) || defined(__need_size_t) || defined(__need_wchar_t) || defined(__need_NULL) ||          \
-    defined(__need_wint_t)
+#if defined(__need_ptrdiff_t) || defined(__need_size_t) || defined(__need_rsize_t) || defined(__need_wchar_t) ||       \
----------------
AaronBallman wrote:

My understanding is that this is needed for interfacing with other CRTs (primarily Apple's?):
https://opensource.apple.com/source/Libc/Libc-825.26/include/stddef.h.auto.html
https://lists.llvm.org/pipermail/cfe-commits/Week-of-Mon-20151005/140394.html

and was carried forward with newer functionality more recently:
https://reviews.llvm.org/D157757

https://github.com/llvm/llvm-project/pull/86252