[libcxx-commits] [clang] [libcxx] [clang] Add builtin to clear padding bytes (prework for P0528R3) (PR #75371)

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@@ -970,6 +970,12 @@ def IsWithinLifetime : LangBuiltin<"CXX_LANG"> {
   let Prototype = "bool(void*)";
 }
 
+def ClearPadding : LangBuiltin<"CXX_LANG"> {
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huixie90 wrote:

Thanks for bringing this up. The reason I am creating this patch is to implement a C++ paper https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0528r3.html

I am not familiar with the C standard and not sure if this operation is needed. And the implementation is trying to access the Cxx record and I am not sure how easy to make it work for C.

https://github.com/llvm/llvm-project/pull/75371