================
@@ -833,6 +833,12 @@ def BuiltinVaStart : Builtin {
   let Prototype = "void(__builtin_va_list_ref, ...)";
 }
 
+def BuiltinC32VaStart : LangBuiltin<"C23_LANG"> {
----------------
erichkeane wrote:

Actually KIND OF sad that this is C23 only.  a `va_start` macro having to 
change its implementation based on language version is sad.  I would think 
making this builtin available as an extension in all language modes would be 
defensible.

https://github.com/llvm/llvm-project/pull/131166
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