diff --git a/core/io/image.cpp b/core/io/image.cpp
index d0598e4dc6c..7a30f6a5fec 100644
--- a/core/io/image.cpp
+++ b/core/io/image.cpp
@@ -2331,6 +2331,10 @@ void Image::initialize_data(const char **p_xpm) {
 			} break;
 			case READING_PIXELS: {
 				int y = line - colormap_size - 1;
+#if defined(__GNUC__) && !defined(__clang__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic warning "-Wstringop-overflow=0"
+#endif
 				for (int x = 0; x < size_width; x++) {
 					char pixelstr[6] = { 0, 0, 0, 0, 0, 0 };
 					for (int i = 0; i < pixelchars; i++) {
@@ -2345,6 +2349,9 @@ void Image::initialize_data(const char **p_xpm) {
 					}
 					_put_pixelb(x, y, pixel_size, data_write, pixel);
 				}
+#if defined(__GNUC__) && !defined(__clang__)
+#pragma GCC diagnostic pop
+#endif
 
 				if (y == (size_height - 1)) {
 					status = DONE;
diff --git a/core/math/geometry_2d.cpp b/core/math/geometry_2d.cpp
index d60619b27ff..e1643ebb28f 100644
--- a/core/math/geometry_2d.cpp
+++ b/core/math/geometry_2d.cpp
@@ -30,7 +30,14 @@
 
 #include "geometry_2d.h"
 
+#if defined(__GNUC__) && !defined(__clang__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Walloc-zero"
+#endif
 #include "thirdparty/clipper2/include/clipper2/clipper.h"
+#if defined(__GNUC__) && !defined(__clang__)
+#pragma GCC diagnostic pop
+#endif
 #include "thirdparty/misc/polypartition.h"
 #define STB_RECT_PACK_IMPLEMENTATION
 #include "thirdparty/misc/stb_rect_pack.h"
diff --git a/drivers/wasapi/audio_driver_wasapi.cpp b/drivers/wasapi/audio_driver_wasapi.cpp
index a349a66f754..abac7a9337c 100644
--- a/drivers/wasapi/audio_driver_wasapi.cpp
+++ b/drivers/wasapi/audio_driver_wasapi.cpp
@@ -89,7 +89,7 @@ __CRT_UUID_DECL(IAudioClient3, 0x7ED4EE07, 0x8E67, 0x4CD4, 0x8C, 0x1A, 0x2B, 0x7
 
 #endif // __MINGW32__ || __MINGW64__
 
-#ifndef PKEY_Device_FriendlyName
+#ifndef PKEY_Device_FriendlyNameGodot
 
 #undef DEFINE_PROPERTYKEY
 /* clang-format off */
@@ -97,7 +97,7 @@ __CRT_UUID_DECL(IAudioClient3, 0x7ED4EE07, 0x8E67, 0x4CD4, 0x8C, 0x1A, 0x2B, 0x7
 	const PROPERTYKEY id = { { a, b, c, { d, e, f, g, h, i, j, k, } }, l };
 /* clang-format on */
 
-DEFINE_PROPERTYKEY(PKEY_Device_FriendlyName, 0xa45c254e, 0xdf1c, 0x4efd, 0x80, 0x20, 0x67, 0xd1, 0x46, 0xa8, 0x50, 0xe0, 14);
+DEFINE_PROPERTYKEY(PKEY_Device_FriendlyNameGodot, 0xa45c254e, 0xdf1c, 0x4efd, 0x80, 0x20, 0x67, 0xd1, 0x46, 0xa8, 0x50, 0xe0, 14);
 #endif
 
 const CLSID CLSID_MMDeviceEnumerator = __uuidof(MMDeviceEnumerator);
@@ -225,7 +225,7 @@ Error AudioDriverWASAPI::audio_device_init(AudioDeviceWASAPI *p_device, bool p_i
 			PROPVARIANT propvar;
 			PropVariantInit(&propvar);
 
-			hr = props->GetValue(PKEY_Device_FriendlyName, &propvar);
+			hr = props->GetValue(PKEY_Device_FriendlyNameGodot, &propvar);
 			ERR_BREAK(hr != S_OK);
 
 			if (p_device->device_name == String(propvar.pwszVal)) {
@@ -588,7 +588,7 @@ PackedStringArray AudioDriverWASAPI::audio_device_get_list(bool p_input) {
 		PROPVARIANT propvar;
 		PropVariantInit(&propvar);
 
-		hr = props->GetValue(PKEY_Device_FriendlyName, &propvar);
+		hr = props->GetValue(PKEY_Device_FriendlyNameGodot, &propvar);
 		ERR_BREAK(hr != S_OK);
 
 		list.push_back(String(propvar.pwszVal));
diff --git a/scene/resources/packed_scene.cpp b/scene/resources/packed_scene.cpp
index 86b0ed668e7..4ad500b1257 100644
--- a/scene/resources/packed_scene.cpp
+++ b/scene/resources/packed_scene.cpp
@@ -158,6 +158,7 @@ Node *SceneState::instantiate(GenEditState p_edit_state) const {
 	const NodeData *nd = &nodes[0];
 
 	Node **ret_nodes = (Node **)alloca(sizeof(Node *) * nc);
+	ret_nodes[0] = nullptr; // Sidesteps "maybe uninitialized" false-positives on GCC.
 
 	bool gen_node_path_cache = p_edit_state != GEN_EDIT_STATE_DISABLED && node_path_cache.is_empty();