Windows: Fix compilation warnings with GCC 11.2.1

drivers/wasapi/audio_driver_wasapi.cpp

@@ -121,6 +121,12 @@ const IID IID_IAudioCaptureClient = __uuidof(IAudioCaptureClient);
 static bool default_render_device_changed = false;
 static bool default_capture_device_changed = false;
 
+// Silence warning due to a COM API weirdness (GH-35194).
+#if defined(__GNUC__) && !defined(__clang__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wnon-virtual-dtor"
+#endif
+
 class CMMNotificationClient : public IMMNotificationClient {
 	LONG _cRef = 1;
 	IMMDeviceEnumerator *_pEnumerator = nullptr;
@@ -162,7 +168,7 @@ public:
 
 	HRESULT STDMETHODCALLTYPE OnDeviceAdded(LPCWSTR pwstrDeviceId) {
 		return S_OK;
-	};
+	}
 
 	HRESULT STDMETHODCALLTYPE OnDeviceRemoved(LPCWSTR pwstrDeviceId) {
 		return S_OK;
@@ -189,6 +195,10 @@ public:
 	}
 };
 
+#if defined(__GNUC__) && !defined(__clang__)
+#pragma GCC diagnostic pop
+#endif
+
 static CMMNotificationClient notif_client;
 
 Error AudioDriverWASAPI::audio_device_init(AudioDeviceWASAPI *p_device, bool p_capture, bool reinit) {
@@ -373,7 +383,7 @@ Error AudioDriverWASAPI::audio_device_init(AudioDeviceWASAPI *p_device, bool p_c
 		hr = p_device->audio_client->Initialize(AUDCLNT_SHAREMODE_SHARED, streamflags, p_capture ? REFTIMES_PER_SEC : 0, 0, pwfex, nullptr);
 		ERR_FAIL_COND_V_MSG(hr != S_OK, ERR_CANT_OPEN, "WASAPI: Initialize failed with error 0x" + String::num_uint64(hr, 16) + ".");
 		UINT32 max_frames;
-		HRESULT hr = p_device->audio_client->GetBufferSize(&max_frames);
+		hr = p_device->audio_client->GetBufferSize(&max_frames);
 		ERR_FAIL_COND_V(hr != S_OK, ERR_CANT_OPEN);
 
 		// Due to WASAPI Shared Mode we have no control of the buffer size

platform/windows/display_server_windows.cpp

@@ -42,6 +42,11 @@
 #include "drivers/gles3/rasterizer_gles3.h"
 #endif
 
+#if defined(__GNUC__)
+// Workaround GCC warning from -Wcast-function-type.
+#define GetProcAddress (void *)GetProcAddress
+#endif
+
 static String format_error_message(DWORD id) {
 	LPWSTR messageBuffer = nullptr;
 	size_t size = FormatMessageW(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,

platform/windows/gl_manager_windows.cpp

@@ -197,9 +197,6 @@ Error GLManager_Windows::window_create(DisplayServer::WindowID p_window_id, HWND
 		return FAILED;
 	}
 
-	// the display could be invalid .. check NYI
-	GLDisplay &gl_display = _displays[win.gldisplay_id];
-
 	// make current
 	window_make_current(_windows.size() - 1);