Suppress pointless Clang 23 unused template warnings.

Similar to what I did in Corrade.

doc/snippets/SceneGraph.cpp

@@ -146,6 +146,12 @@ class CachingObject: public Object3D, SceneGraph::AbstractFeature3D {
 
 namespace {
 
+/* Clang 23 adds -Wunused-template to -Wall and then warns about the unused
+   constructor. Well, this is a doc snippet, so what am I supposed to do? */
+#ifdef CORRADE_TARGET_CLANG
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wunused-template"
+#endif
 /* [transformation] */
 class TransformingFeature: public SceneGraph::AbstractFeature3D {
     public:
@@ -161,6 +167,9 @@ class TransformingFeature: public SceneGraph::AbstractFeature3D {
         SceneGraph::AbstractTranslationRotation3D& _transformation;
 };
 /* [transformation] */
+#ifdef CORRADE_TARGET_CLANG
+#pragma clang diagnostic pop
+#endif
 
 }
 

src/Magnum/Math/FunctionsBatch.h

@@ -49,9 +49,21 @@ namespace Implementation {
 
 /** @todo Utility/Algorithms.h has a similar (but different) variant of this,
     maybe turn that into some public utility once we have one more use case? */
+/* Clang since version 23 includes -Wunused-template in -Wall, and warns for
+   those declarations. The templates are used inside a decltype() expression
+   below (and commenting them out obviously makes the test fail to compile) so
+   this is yet another completely pointless warning that just wastes my
+   time. */
+#ifdef CORRADE_TARGET_CLANG
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wunused-template"
+#endif
 template<class T, class View = decltype(Containers::Implementation::ErasedArrayViewConverter<typename std::remove_reference<T&&>::type>::from(std::declval<T&&>()))> static auto stridedArrayViewTypeFor(T&&) -> typename std::remove_const<typename View::Type>::type;
 template<class T> static typename std::remove_const<T>::type stridedArrayViewTypeFor(const Containers::ArrayView<T>&);
 template<class T> static typename std::remove_const<T>::type stridedArrayViewTypeFor(const Containers::StridedArrayView1D<T>&);
+#ifdef CORRADE_TARGET_CLANG
+#pragma clang diagnostic pop
+#endif
 
 }