[clang] [clang] Constant-evaluate format strings as last resort (PR #135864)

[via cfe-commits]

================
@@ -5935,8 +5936,14 @@ static void CheckFormatString(
     llvm::SmallBitVector &CheckedVarArgs, UncoveredArgHandler &UncoveredArg,
     bool IgnoreStringsWithoutSpecifiers);
 
-static const Expr *maybeConstEvalStringLiteral(ASTContext &Context,
-                                               const Expr *E);
+enum StringLiteralConstEvalResult {
+  SLCER_NotEvaluated,
+  SLCER_NotNullTerminated,
+  SLCER_Evaluated,
+};
+
+static StringLiteralConstEvalResult
+constEvalStringAsLiteral(Sema &S, const Expr *E, const StringLiteral *&SL);
----------------
cor3ntin wrote:

```suggestion
enum StringLiteralConstEvalResult {
  SLCER_NotEvaluated,
  SLCER_NotNullTerminated,
  SLCER_Evaluated,
};

static StringLiteralConstEvalResult
EvaluateStringAndCreateLiteral(Sema &S, const Expr *E, const StringLiteral 
*&SL);
```

https://github.com/llvm/llvm-project/pull/135864
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