================
@@ -3307,6 +3307,29 @@ void Sema::CheckShadowInheritedFields(const
SourceLocation &Loc,
}
}
+template <typename AttrType>
+inline static bool HasAttribute(const QualType &T) {
----------------
AaronBallman wrote:
Here's my take on it: https://godbolt.org/z/qxq6jf3jM
```
class [[gnu::warn_unused]] S
{
public:
S();
};
struct [[maybe_unused]] T {};
void f()
{
int i = 0; // Clang, GCC warn
S s; // Clang, GCC warn
T t; // Neither warn
}
class C
{
private:
const int i = 0; // Clang warns
int j = 0; // Clang warns
const S s1; // Neither warn, Clang should warn
const T t1; // Neither warn
S s2; // Neither warn, Clang should warn
T t2; // Neither warn
};
```
GCC doesn't support `-Wunused-private-field`, so it makes sense that they never
warn on unused private fields. GCC doesn't document `warn_unused` as an
attribute that I can find (they document `warn_unused_result`) but they do seem
to support it. As best I can tell, the distinction between it and
`maybe_unused` is that putting the attribute on a type does not silence the
diagnostic on uses of that type.
https://github.com/llvm/llvm-project/pull/120734
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