Fix unused variable warnings on a no-assert build.

src/Magnum/GL/Implementation/RendererState.cpp

@@ -380,6 +380,9 @@ void RendererState::applyPixelStorageInternal(const Magnum::PixelStorage& storag
 
 void RendererState::applyCompressedPixelStorageInternal(const CompressedPixelStorage& storage, const Vector3i& blockSize, const Int blockDataSize, const bool isUnpack) {
     #ifdef MAGNUM_TARGET_GLES
+    #ifdef CORRADE_NO_ASSERT
+    static_cast<void>(storage);
+    #endif
     CORRADE_ASSERT(storage == CompressedPixelStorage{},
         "GL: non-default CompressedPixelStorage parameters are not supported in OpenGL ES or WebGL", );
     static_cast<void>(blockSize);

src/Magnum/Platform/Sdl2Application.cpp

@@ -378,6 +378,12 @@ Vector2 Sdl2Application::dpiScalingInternal(const Implementation::Sdl2DpiScaling
     CORRADE_INTERNAL_ASSERT(dpiScalingPolicy == Implementation::Sdl2DpiScalingPolicy::Virtual || dpiScalingPolicy == Implementation::Sdl2DpiScalingPolicy::Physical);
     #else
     CORRADE_INTERNAL_ASSERT(dpiScalingPolicy == Implementation::Sdl2DpiScalingPolicy::Physical);
+    /* On Emscripten the DPI scaling policy is only used in the above
+       assertion, otherwise it's unused. Suppressing an unused variable warning
+       instead of adding even more ifdefs to make the code easier to read. */
+    #if defined(CORRADE_TARGET_EMSCRIPTEN) && defined(CORRADE_NO_ASSERT)
+    static_cast<void>(dpiScalingPolicy);
+    #endif
     #endif
 
     /* Take device pixel ratio on Emscripten */

src/Magnum/Trade/MaterialData.cpp

@@ -299,7 +299,11 @@ MaterialData::MaterialData(const MaterialTypes types, Containers::Array<Material
         if(end - begin > 1) for(std::size_t j = begin + 1; j != end; ++j) {
             if(_data[j - 1].name() < _data[j].name()) continue;
 
-            std::sort(_data + begin, _data + end, [i](const MaterialAttributeData& a, const MaterialAttributeData& b) {
+            std::sort(_data + begin, _data + end, [
+                #ifndef CORRADE_NO_ASSERT
+                i
+                #endif
+            ](const MaterialAttributeData& a, const MaterialAttributeData& b) {
                 /* Need to check here (instead of in the outer for loop) as we
                    exit the loop right after the sort and thus duplicates that
                    occur after the first non-sorted pair wouldn't get detected.