[llvm-branch-commits] Prepare libcxx and libcxxabi for pointer field protection. (PR #151651)

[Nikolas Klauser via llvm-branch-commits]

================
@@ -1262,6 +1275,14 @@ typedef __char32_t char32_t;
 #    define _LIBCPP_HAS_EXPLICIT_THIS_PARAMETER 0
 #  endif
 
+#  if defined(__POINTER_FIELD_PROTECTION__)
+#    define _LIBCPP_PFP [[clang::pointer_field_protection]]
+#    define _LIBCPP_NO_PFP [[clang::no_field_protection]]
----------------
philnik777 wrote:

These should be _Uglified. Do these attributes do anything with pfp disabled? If no, why not simply check for their availability like with other attributes?

https://github.com/llvm/llvm-project/pull/151651