[Windows] Fix MinGW debug symbols.

SConstruct

@@ -731,9 +731,12 @@ if env.msvc:
         env.Append(CCFLAGS=["/Od"])
 else:
     if env["debug_symbols"]:
-        # Adding dwarf-4 explicitly makes stacktraces work with clang builds,
-        # otherwise addr2line doesn't understand them
-        env.Append(CCFLAGS=["-gdwarf-4"])
+        if env["platform"] == "windows":
+            env.Append(CCFLAGS=["-gdwarf-5"])
+        else:
+            # Adding dwarf-4 explicitly makes stacktraces work with clang builds,
+            # otherwise addr2line doesn't understand them
+            env.Append(CCFLAGS=["-gdwarf-4"])
         if methods.using_emcc(env):
             # Emscripten only produces dwarf symbols when using "-g3".
             env.Append(CCFLAGS=["-g3"])

platform/windows/crash_handler_windows_signal.cpp

@@ -164,6 +164,9 @@ extern void CrashHandlerException(int signal) {
 	int64_t image_file_base = get_image_base(_execpath);
 	data.offset = image_mem_base - image_file_base;
 
+	if (FileAccess::exists(_execpath + ".debugsymbols")) {
+		_execpath = _execpath + ".debugsymbols";
+	}
 	data.state = backtrace_create_state(_execpath.utf8().get_data(), 0, &error_callback, reinterpret_cast<void *>(&data));
 	if (data.state != nullptr) {
 		data.index = 1;