Backends: Fixed various warnings discovered when using MinGW GCC 15/Clang on latest backends.

dx12: 'ImGui_ImplDX12_Data* bd' shadowed local in spite of being in lambda.

backends/imgui_impl_dx10.cpp

@@ -50,6 +50,12 @@
 #pragma comment(lib, "d3dcompiler") // Automatically link with d3dcompiler.lib as we are using D3DCompile() below.
 #endif
 
+// 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.
+#pragma clang diagnostic ignored "-Wsign-conversion"        // warning: implicit conversion changes signedness
+#endif
+
 // DirectX10 data
 struct ImGui_ImplDX10_Texture
 {

backends/imgui_impl_dx11.cpp

@@ -52,6 +52,12 @@
 #pragma comment(lib, "d3dcompiler") // Automatically link with d3dcompiler.lib as we are using D3DCompile() below.
 #endif
 
+// 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.
+#pragma clang diagnostic ignored "-Wsign-conversion"        // warning: implicit conversion changes signedness
+#endif
+
 // DirectX11 data
 struct ImGui_ImplDX11_Texture
 {

backends/imgui_impl_dx12.cpp

@@ -62,6 +62,12 @@
 #pragma comment(lib, "d3dcompiler") // Automatically link with d3dcompiler.lib as we are using D3DCompile() below.
 #endif
 
+// 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.
+#pragma clang diagnostic ignored "-Wsign-conversion"        // warning: implicit conversion changes signedness
+#endif
+
 // MinGW workaround, see #4594
 typedef decltype(D3D12SerializeRootSignature) *_PFN_D3D12_SERIALIZE_ROOT_SIGNATURE;
 
@@ -800,6 +806,28 @@ void    ImGui_ImplDX12_InvalidateDeviceObjects()
     }
 }
 
+#ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS
+static void ImGui_ImplDX12_InitLegacySingleDescriptorMode(ImGui_ImplDX12_InitInfo* init_info)
+{
+    // Wrap legacy behavior of passing space for a single descriptor
+    IM_ASSERT(init_info->LegacySingleSrvCpuDescriptor.ptr != 0 && init_info->LegacySingleSrvGpuDescriptor.ptr != 0);
+    init_info->SrvDescriptorAllocFn = [](ImGui_ImplDX12_InitInfo*, D3D12_CPU_DESCRIPTOR_HANDLE* out_cpu_handle, D3D12_GPU_DESCRIPTOR_HANDLE* out_gpu_handle)
+    {
+        ImGui_ImplDX12_Data* bd = ImGui_ImplDX12_GetBackendData();
+        IM_ASSERT(bd->LegacySingleDescriptorUsed == false && "Only 1 simultaneous texture allowed with legacy ImGui_ImplDX12_Init() signature!");
+        *out_cpu_handle = bd->InitInfo.LegacySingleSrvCpuDescriptor;
+        *out_gpu_handle = bd->InitInfo.LegacySingleSrvGpuDescriptor;
+        bd->LegacySingleDescriptorUsed = true;
+    };
+    init_info->SrvDescriptorFreeFn = [](ImGui_ImplDX12_InitInfo*, D3D12_CPU_DESCRIPTOR_HANDLE, D3D12_GPU_DESCRIPTOR_HANDLE)
+    {
+        ImGui_ImplDX12_Data* bd = ImGui_ImplDX12_GetBackendData();
+        IM_ASSERT(bd->LegacySingleDescriptorUsed == true);
+        bd->LegacySingleDescriptorUsed = false;
+    };
+}
+#endif
+
 bool ImGui_ImplDX12_Init(ImGui_ImplDX12_InitInfo* init_info)
 {
     ImGuiIO& io = ImGui::GetIO();
@@ -826,24 +854,7 @@ bool ImGui_ImplDX12_Init(ImGui_ImplDX12_InitInfo* init_info)
 
 #ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS
     if (init_info->SrvDescriptorAllocFn == nullptr)
-    {
-        // Wrap legacy behavior of passing space for a single descriptor
-        IM_ASSERT(init_info->LegacySingleSrvCpuDescriptor.ptr != 0 && init_info->LegacySingleSrvGpuDescriptor.ptr != 0);
-        init_info->SrvDescriptorAllocFn = [](ImGui_ImplDX12_InitInfo*, D3D12_CPU_DESCRIPTOR_HANDLE* out_cpu_handle, D3D12_GPU_DESCRIPTOR_HANDLE* out_gpu_handle)
-        {
-            ImGui_ImplDX12_Data* bd = ImGui_ImplDX12_GetBackendData();
-            IM_ASSERT(bd->LegacySingleDescriptorUsed == false && "Only 1 simultaneous texture allowed with legacy ImGui_ImplDX12_Init() signature!");
-            *out_cpu_handle = bd->InitInfo.LegacySingleSrvCpuDescriptor;
-            *out_gpu_handle = bd->InitInfo.LegacySingleSrvGpuDescriptor;
-            bd->LegacySingleDescriptorUsed = true;
-        };
-        init_info->SrvDescriptorFreeFn = [](ImGui_ImplDX12_InitInfo*, D3D12_CPU_DESCRIPTOR_HANDLE, D3D12_GPU_DESCRIPTOR_HANDLE)
-        {
-            ImGui_ImplDX12_Data* bd = ImGui_ImplDX12_GetBackendData();
-            IM_ASSERT(bd->LegacySingleDescriptorUsed == true);
-            bd->LegacySingleDescriptorUsed = false;
-        };
-    }
+        ImGui_ImplDX12_InitLegacySingleDescriptorMode(init_info);
 #endif
     IM_ASSERT(init_info->SrvDescriptorAllocFn != nullptr && init_info->SrvDescriptorFreeFn != nullptr);
 

backends/imgui_impl_dx9.cpp

@@ -46,6 +46,12 @@
 // DirectX
 #include <d3d9.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.
+#pragma clang diagnostic ignored "-Wsign-conversion"        // warning: implicit conversion changes signedness
+#endif
+
 // DirectX data
 struct ImGui_ImplDX9_Data
 {
@@ -368,8 +374,8 @@ static void ImGui_ImplDX9_CopyTextureRegion(bool tex_use_colors, const ImU32* sr
 #endif
     for (int y = 0; y < h; y++)
     {
-        ImU32* src_p = (ImU32*)((unsigned char*)src + src_pitch * y);
-        ImU32* dst_p = (ImU32*)((unsigned char*)dst + dst_pitch * y);
+        const ImU32* src_p = (const ImU32*)(void*)((const unsigned char*)src + src_pitch * y);
+        ImU32* dst_p = (ImU32*)(void*)((unsigned char*)dst + dst_pitch * y);
         if (convert_rgba_to_bgra)
             for (int x = w; x > 0; x--, src_p++, dst_p++) // Convert copy
                 *dst_p = IMGUI_COL_TO_DX9_ARGB(*src_p);

backends/imgui_impl_glfw.cpp

@@ -545,6 +545,7 @@ static LRESULT CALLBACK ImGui_ImplGlfw_WndProc(HWND hWnd, UINT msg, WPARAM wPara
     case WM_XBUTTONDOWN: case WM_XBUTTONDBLCLK: case WM_XBUTTONUP:
         io.AddMouseSourceEvent(GetMouseSourceFromMessageExtraInfo());
         break;
+    default: break;
     }
     return ::CallWindowProcW(bd->PrevWndProc, hWnd, msg, wParam, lParam);
 }

backends/imgui_impl_sdl2.cpp

@@ -104,6 +104,7 @@
 // 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 "-Wimplicit-int-float-conversion"  // warning: implicit conversion from 'xxx' to 'float' may lose precision
 #endif
 
@@ -434,7 +435,7 @@ bool ImGui_ImplSDL2_ProcessEvent(const SDL_Event* event)
             //    (event->type == SDL_KEYDOWN) ? "DOWN" : "UP  ", event->key.keysym.sym, SDL_GetKeyName(event->key.keysym.sym), event->key.keysym.scancode, SDL_GetScancodeName(event->key.keysym.scancode), event->key.keysym.mod);
             ImGuiKey key = ImGui_ImplSDL2_KeyEventToImGuiKey(event->key.keysym.sym, event->key.keysym.scancode);
             io.AddKeyEvent(key, (event->type == SDL_KEYDOWN));
-            io.SetKeyEventNativeData(key, event->key.keysym.sym, event->key.keysym.scancode, event->key.keysym.scancode); // To support legacy indexing (<1.87 user code). Legacy backend uses SDLK_*** as indices to IsKeyXXX() functions.
+            io.SetKeyEventNativeData(key, (int)event->key.keysym.sym, (int)event->key.keysym.scancode, (int)event->key.keysym.scancode); // To support legacy indexing (<1.87 user code). Legacy backend uses SDLK_*** as indices to IsKeyXXX() functions.
             return true;
         }
         case SDL_WINDOWEVENT:
@@ -466,6 +467,8 @@ bool ImGui_ImplSDL2_ProcessEvent(const SDL_Event* event)
             bd->WantUpdateGamepadsList = true;
             return true;
         }
+        default:
+            break;
     }
     return false;
 }

backends/imgui_impl_sdl3.cpp

@@ -64,6 +64,7 @@
 // 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 "-Wimplicit-int-float-conversion"  // warning: implicit conversion from 'xxx' to 'float' may lose precision
 #endif
 
@@ -409,7 +410,7 @@ bool ImGui_ImplSDL3_ProcessEvent(const SDL_Event* event)
             //    (event->type == SDL_EVENT_KEY_DOWN) ? "DOWN" : "UP  ", event->key.key, SDL_GetKeyName(event->key.key), event->key.scancode, SDL_GetScancodeName(event->key.scancode), event->key.mod);
             ImGuiKey key = ImGui_ImplSDL3_KeyEventToImGuiKey(event->key.key, event->key.scancode);
             io.AddKeyEvent(key, (event->type == SDL_EVENT_KEY_DOWN));
-            io.SetKeyEventNativeData(key, event->key.key, event->key.scancode, event->key.scancode); // To support legacy indexing (<1.87 user code). Legacy backend uses SDLK_*** as indices to IsKeyXXX() functions.
+            io.SetKeyEventNativeData(key, (int)event->key.key, (int)event->key.scancode, (int)event->key.scancode); // To support legacy indexing (<1.87 user code). Legacy backend uses SDLK_*** as indices to IsKeyXXX() functions.
             return true;
         }
         case SDL_EVENT_WINDOW_MOUSE_ENTER:
@@ -445,6 +446,8 @@ bool ImGui_ImplSDL3_ProcessEvent(const SDL_Event* event)
             bd->WantUpdateGamepadsList = true;
             return true;
         }
+        default:
+            break;
     }
     return false;
 }
@@ -471,7 +474,7 @@ static bool ImGui_ImplSDL3_Init(SDL_Window* window, SDL_Renderer* renderer, void
 
     // Setup backend capabilities flags
     ImGui_ImplSDL3_Data* bd = IM_NEW(ImGui_ImplSDL3_Data)();
-    snprintf(bd->BackendPlatformName, sizeof(bd->BackendPlatformName), "imgui_impl_sdl3 (%u.%u.%u; %u.%u.%u)",
+    snprintf(bd->BackendPlatformName, sizeof(bd->BackendPlatformName), "imgui_impl_sdl3 (%d.%d.%d; %d.%d.%d)",
         SDL_MAJOR_VERSION, SDL_MINOR_VERSION, SDL_MICRO_VERSION, SDL_VERSIONNUM_MAJOR(ver_linked), SDL_VERSIONNUM_MINOR(ver_linked), SDL_VERSIONNUM_MICRO(ver_linked));
     io.BackendPlatformUserData = (void*)bd;
     io.BackendPlatformName = bd->BackendPlatformName;

backends/imgui_impl_sdlrenderer2.cpp

@@ -44,6 +44,8 @@
 #if defined(__clang__)
 #pragma clang diagnostic push
 #pragma clang diagnostic ignored "-Wsign-conversion"    // warning: implicit conversion changes signedness
+#elif defined(__GNUC__)
+#pragma GCC diagnostic ignored "-Wfloat-equal"                      // warning: comparing floating-point with '==' or '!=' is unsafe
 #endif
 
 // SDL

backends/imgui_impl_sdlrenderer3.cpp

@@ -41,6 +41,8 @@
 #if defined(__clang__)
 #pragma clang diagnostic push
 #pragma clang diagnostic ignored "-Wsign-conversion"    // warning: implicit conversion changes signedness
+#elif defined(__GNUC__)
+#pragma GCC diagnostic ignored "-Wfloat-equal"          // warning: comparing floating-point with '==' or '!=' is unsafe
 #endif
 
 // SDL

backends/imgui_impl_vulkan.cpp

@@ -1250,7 +1250,7 @@ void ImGui_ImplVulkan_Shutdown()
 
     ImGui_ImplVulkan_DestroyDeviceObjects();
 #ifdef IMGUI_IMPL_VULKAN_HAS_DYNAMIC_RENDERING
-    IM_FREE((void*)bd->VulkanInitInfo.PipelineRenderingCreateInfo.pColorAttachmentFormats);
+    IM_FREE((void*)const_cast<VkFormat*>(bd->VulkanInitInfo.PipelineRenderingCreateInfo.pColorAttachmentFormats));
 #endif
 
     io.BackendRendererName = nullptr;

backends/imgui_impl_win32.cpp

@@ -571,6 +571,7 @@ ImGuiKey ImGui_ImplWin32_KeyEventToImGuiKey(WPARAM wParam, LPARAM lParam)
     case 51: return ImGuiKey_Comma;
     case 52: return ImGuiKey_Period;
     case 53: return ImGuiKey_Slash;
+    default: break;
     }
 
     return ImGuiKey_None;

imgui_demo.cpp

@@ -8146,7 +8146,7 @@ void ImGui::ShowAboutWindow(bool* p_open)
         if (io.BackendFlags & ImGuiBackendFlags_RendererHasTextures)    ImGui::Text(" RendererHasTextures");
         ImGui::Separator();
         ImGui::Text("io.Fonts: %d fonts, Flags: 0x%08X, TexSize: %d,%d", io.Fonts->Fonts.Size, io.Fonts->Flags, io.Fonts->TexData->Width, io.Fonts->TexData->Height);
-        ImGui::Text("io.Fonts->FontLoaderName: \"%s\"", io.Fonts->FontLoaderName ? io.Fonts->FontLoaderName : "NULL");
+        ImGui::Text("io.Fonts->FontLoaderName: %s", io.Fonts->FontLoaderName ? io.Fonts->FontLoaderName : "NULL");
         ImGui::Text("io.DisplaySize: %.2f,%.2f", io.DisplaySize.x, io.DisplaySize.y);
         ImGui::Text("io.DisplayFramebufferScale: %.2f,%.2f", io.DisplayFramebufferScale.x, io.DisplayFramebufferScale.y);
         ImGui::Separator();