[clang] [clang][sema] Add nonnull attribute to builtin format functions (PR #158626)

[via cfe-commits]

================
@@ -17097,6 +17097,15 @@ void Sema::AddKnownFunctionAttributes(FunctionDecl 
*FD) {
       }
     }
 
+    SmallVector<int, 4> Indxs;
+    if (Context.BuiltinInfo.IsNonNull(BuiltinID, Indxs) &&
+        !FD->hasAttr<NonNullAttr>()) {
+      llvm::SmallVector<ParamIdx, 4> ParamIndxs;
+      for (int I : Indxs)
+        ParamIndxs.push_back(ParamIdx(I + 1, FD));
+      FD->addAttr(NonNullAttr::CreateImplicit(Context, ParamIndxs.data(),
+                                              ParamIndxs.size()));
----------------
Sirraide wrote:

Ah, I forgot it requires a decl, in that case that’s fine.

https://github.com/llvm/llvm-project/pull/158626
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