[llvm-branch-commits] Add pointer field protection feature. (PR #133538)

[Oliver Hunt via llvm-branch-commits]

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@@ -2513,6 +2513,12 @@ def CountedByOrNull : DeclOrTypeAttr {
   let LangOpts = [COnly];
 }
 
+def NoPointerFieldProtection : DeclOrTypeAttr {
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ojhunt wrote:

This an ABI break so I don't think it can reasonably an on by default for all structs - we can already see annotations in libc++, and they would be needed on every single struct field.

We can imagine a new platform where this would be the platform ABI, but for every other case it is functionally unusable.

I would recommend attributes to permit opt in and opt out on a per-struct basis, and CLI flags to select the default behavior.

https://github.com/llvm/llvm-project/pull/133538