================
@@ -11801,6 +11801,26 @@ static bool CheckMultiVersionFunction(Sema &S,
FunctionDecl *NewFD,
OldDecl, Previous);
}
+static void CheckFunctionDeclarationAttributesUsage(Sema &S,
+ FunctionDecl *NewFD) {
+ bool IsPure = NewFD->hasAttr<PureAttr>();
+ bool IsConst = NewFD->hasAttr<ConstAttr>();
+
+ if (IsPure && IsConst) {
+ S.Diag(NewFD->getLocation(), diag::warn_const_attr_with_pure_attr);
+ NewFD->dropAttrs<PureAttr>();
+ }
+ if (!IsPure && !IsConst)
+ return;
----------------
AaronBallman wrote:
```suggestion
// If there are no pure or const attributes, there's nothing to check.
if (!IsPure || !IsConst)
return;
// If the function is marked both pure and const, we retain the const
attribute
// because it makes stronger guarantees than the pure attribute, and we drop
// the pure attribute explicitly to prevent later confusion about semantics.
if (IsPure && IsConst) {
S.Diag(NewFD->getLocation(), diag::warn_const_attr_with_pure_attr);
NewFD->dropAttrs<PureAttr>();
}
```
Rearranging the logic and adding some comments.
https://github.com/llvm/llvm-project/pull/78200
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