================
@@ -7061,6 +7140,16 @@ bool Sema::CheckFormatArguments(ArrayRef<const Expr *> 
Args,
       SourceMgr.isInSystemMacro(FormatLoc))
     return false;
 
+  const LangOptions &LO = getLangOpts();
+  if (CallerParamIdx && (LO.GNUMode || LO.C23 || LO.CPlusPlus11))
----------------
vvuksanovic wrote:

Right, the user can figure out a way to write the attribute in a suitable way. 
I have changed the diagnostic message to include the attribute parameters as 
well like:
```
diagnostic behavior may be improved by adding the 'format(printf, X, Y)' 
attribute to the declaration of 'foo'
```
so even if there is no fixit, the full suggested attribute is still shown.

https://github.com/llvm/llvm-project/pull/166738
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