diff --git a/src/common/gsvector_sse.h b/src/common/gsvector_sse.h
index 2777f2a98..dc3234539 100644
--- a/src/common/gsvector_sse.h
+++ b/src/common/gsvector_sse.h
@@ -881,7 +881,7 @@ public:
 
   ALWAYS_INLINE bool rempty() const { return lt32(zwzw()).mask() != 0x00ff; }
 
-  ALWAYS_INLINE GSVector4i runion(const GSVector4i& v) const { return min_i32(v).upl64(max_i32(v).srl<8>()); }
+  ALWAYS_INLINE GSVector4i runion(const GSVector4i& v) const { return min_i32(v).blend32<0xc>(max_i32(v)); }
 
   ALWAYS_INLINE GSVector4i rintersect(const GSVector4i& v) const { return sat_i32(v); }
   ALWAYS_INLINE bool rintersects(const GSVector4i& v) const { return !rintersect(v).rempty(); }
@@ -1354,7 +1354,8 @@ public:
 
   ALWAYS_INLINE static GSVector4i loadnt(const void* p)
   {
-    return GSVector4i(_mm_stream_load_si128(static_cast<const __m128i*>(p)));
+    // Should be const, but isn't...
+    return GSVector4i(_mm_stream_load_si128(const_cast<__m128i*>(static_cast<const __m128i*>(p))));
   }
 
   ALWAYS_INLINE static GSVector4i load32(const void* p) { return GSVector4i(_mm_loadu_si32(p)); }
diff --git a/src/duckstation-qt/debuggerwindow.cpp b/src/duckstation-qt/debuggerwindow.cpp
index e8c191edd..f0b8e1bc0 100644
--- a/src/duckstation-qt/debuggerwindow.cpp
+++ b/src/duckstation-qt/debuggerwindow.cpp
@@ -594,7 +594,7 @@ void DebuggerWindow::setMemoryViewRegion(Bus::MemoryRegion region)
   void* const mem_ptr = Bus::GetMemoryRegionPointer(region);
   const bool mem_writable = Bus::IsMemoryRegionWritable(region);
   const MemoryViewWidget::EditCallback edit_callback =
-    ((region == Bus::MemoryRegion::RAM) ? edit_ram_callback : nullptr);
+    ((region == Bus::MemoryRegion::RAM) ? static_cast<MemoryViewWidget::EditCallback>(edit_ram_callback) : nullptr);
   m_ui.memoryView->setData(start, mem_ptr, end - start, mem_writable, edit_callback);
 
 #define SET_REGION_RADIO_BUTTON(name, rb_region)                                                                       \
diff --git a/src/util/imgui_fullscreen.cpp b/src/util/imgui_fullscreen.cpp
index 976ea001a..81fa4068c 100644
--- a/src/util/imgui_fullscreen.cpp
+++ b/src/util/imgui_fullscreen.cpp
@@ -917,6 +917,8 @@ void ImGuiFullscreen::BeginMenuButtons(u32 num_items, float y_align, float x_pad
         case ImGuiDir_Down:
           ImGui::SetScrollY(std::min(ImGui::GetScrollY() + item_height, ImGui::GetScrollMaxY()));
           break;
+        default:
+          break;
       }
     }
 
diff --git a/src/util/vulkan_loader.h b/src/util/vulkan_loader.h
index cf7d267bc..692d40ccf 100644
--- a/src/util/vulkan_loader.h
+++ b/src/util/vulkan_loader.h
@@ -73,12 +73,16 @@ class Error;
 #include "vulkan_entry_points.h"
 
 // We include vk_mem_alloc globally, so we don't accidentally include it before the vulkan header somewhere.
-#ifdef __clang__
+#if defined(__clang__)
 #pragma clang diagnostic push
 #pragma clang diagnostic ignored "-Wnullability-completeness"
 #pragma clang diagnostic ignored "-Wunused-variable"
 #pragma clang diagnostic ignored "-Wmissing-field-initializers"
 #pragma clang diagnostic ignored "-Wunused-function"
+#elif defined(__GNUC__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wunused-variable"
+#pragma GCC diagnostic ignored "-Wunused-function"
 #elif defined(_MSC_VER)
 #pragma warning(push, 0)
 #endif
@@ -88,8 +92,10 @@ class Error;
 #define VMA_STATS_STRING_ENABLED 0
 #include "vulkan/vk_mem_alloc.h"
 
-#ifdef __clang__
+#if defined(__clang__)
 #pragma clang diagnostic pop
+#elif defined(__GNUC__)
+#pragma GCC diagnostic pop
 #elif defined(_MSC_VER)
 #pragma warning(pop)
 #endif