diff --git a/backends/imgui_impl_dx12.h b/backends/imgui_impl_dx12.h
index 4ff510455..3bb66c1fb 100644
--- a/backends/imgui_impl_dx12.h
+++ b/backends/imgui_impl_dx12.h
@@ -44,7 +44,7 @@ struct ImGui_ImplDX12_InitInfo
     D3D12_GPU_DESCRIPTOR_HANDLE LegacySingleSrvGpuDescriptor;
 #endif
 
-    ImGui_ImplDX12_InitInfo()   { memset((void*)this, 0, sizeof(*this)); }
+    ImGui_ImplDX12_InitInfo()   { memset(this, 0, sizeof(*this)); }
 };
 
 // Follow "Getting Started" link and check examples/ folder to learn about using backends!
diff --git a/backends/imgui_impl_glfw.cpp b/backends/imgui_impl_glfw.cpp
index 9ec9ccbf9..ac176a080 100644
--- a/backends/imgui_impl_glfw.cpp
+++ b/backends/imgui_impl_glfw.cpp
@@ -101,8 +101,10 @@
 // Clang warnings with -Weverything
 #if defined(__clang__)
 #pragma clang diagnostic push
-#pragma clang diagnostic ignored "-Wold-style-cast"     // warning: use of old-style cast
-#pragma clang diagnostic ignored "-Wsign-conversion"    // warning: implicit conversion changes signedness
+#pragma clang diagnostic ignored "-Wold-style-cast"         // warning: use of old-style cast
+#pragma clang diagnostic ignored "-Wsign-conversion"        // warning: implicit conversion changes signedness
+#pragma clang diagnostic ignored "-Wexit-time-destructors"  // warning: declaration requires an exit-time destructor     // exit-time destruction order is undefined. if MemFree() leads to users code that has been disabled before exit it might cause problems. ImGui coding style welcomes static/globals.
+#pragma clang diagnostic ignored "-Wglobal-constructors"    // warning: declaration requires a global destructor         // similar to above, not sure what the exact difference is.
 #endif
 
 // GLFW
@@ -957,8 +959,8 @@ static void ImGui_ImplGlfw_GetWindowSizeAndFramebufferScale(GLFWwindow* window,
     int display_w, display_h;
     glfwGetWindowSize(window, &w, &h);
     glfwGetFramebufferSize(window, &display_w, &display_h);
-    float fb_scale_x = (w > 0) ? (float)display_w / w : 1.0f;
-    float fb_scale_y = (h > 0) ? (float)display_h / h : 1.0f;
+    float fb_scale_x = (w > 0) ? (float)display_w / (float)w : 1.0f;
+    float fb_scale_y = (h > 0) ? (float)display_h / (float)h : 1.0f;
 #if GLFW_HAS_X11_OR_WAYLAND
     ImGui_ImplGlfw_Data* bd = ImGui_ImplGlfw_GetBackendData(window);
     if (!bd->IsWayland)
diff --git a/backends/imgui_impl_null.cpp b/backends/imgui_impl_null.cpp
index 9503b1789..6bf3ddb22 100644
--- a/backends/imgui_impl_null.cpp
+++ b/backends/imgui_impl_null.cpp
@@ -17,6 +17,11 @@
 #ifndef IMGUI_DISABLE
 #include "imgui_impl_null.h"
 
+// Clang/GCC warnings with -Weverything
+#if defined(__clang__)
+#pragma clang diagnostic ignored "-Wold-style-cast"         // warning: use of old-style cast                            // yes, they are more terse.
+#endif
+
 IMGUI_IMPL_API bool ImGui_ImplNull_Init()
 {
     ImGui_ImplNullPlatform_Init();
@@ -75,7 +80,7 @@ IMGUI_IMPL_API void ImGui_ImplNullRender_NewFrame()
 {
 }
 
-void ImGui_ImplNullRender_UpdateTexture(ImTextureData* tex)
+static void ImGui_ImplNullRender_UpdateTexture(ImTextureData* tex)
 {
     if (tex->Status == ImTextureStatus_WantCreate || tex->Status == ImTextureStatus_WantDestroy)
         tex->SetStatus(ImTextureStatus_OK);
diff --git a/backends/imgui_impl_sdl3.cpp b/backends/imgui_impl_sdl3.cpp
index 0a8647794..815929595 100644
--- a/backends/imgui_impl_sdl3.cpp
+++ b/backends/imgui_impl_sdl3.cpp
@@ -819,8 +819,8 @@ static void ImGui_ImplSDL3_GetWindowSizeAndFramebufferScale(SDL_Window* window,
 #else
     int display_w, display_h;
     SDL_GetWindowSizeInPixels(window, &display_w, &display_h);
-    float fb_scale_x = (w > 0) ? (float)display_w / w : 1.0f;
-    float fb_scale_y = (h > 0) ? (float)display_h / h : 1.0f;
+    float fb_scale_x = (w > 0) ? (float)display_w / (float)w : 1.0f;
+    float fb_scale_y = (h > 0) ? (float)display_h / (float)h : 1.0f;
 #endif
 
     if (out_size != nullptr)