================
@@ -754,7 +760,22 @@ void WalkAST::checkDeprecatedOrUnsafeBufferHandling(const 
CallExpr *CE,
   if (!filter.check_DeprecatedOrUnsafeBufferHandling)
     return;
 
-  if (!BR.getContext().getLangOpts().C11)
+  const bool ShouldReport = [this] {
+    const bool IsAnnexKAvailable = analysis::isAnnexKAvailable(
+        &BR.getPreprocessor(), BR.getContext().getLangOpts());
+    const bool IsC11OrLaterStandard = BR.getContext().getLangOpts().C11;
----------------
steakhal wrote:

A walker is constructed inside the `checkASTCodeBody` which is per fn 
definition; so it's not cached per TU, but rather per definition - which is 
different.

https://github.com/llvm/llvm-project/pull/168704
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