silence warning

bin/gdbmacros/gdbmacros.cpp

@@ -1674,7 +1674,10 @@ static void qDumpQObjectSignal(QDumper &d)
             d.beginHash();
                 P(d, "name", "[" << i << "] slot");
                 P(d, "type", "");
-                P(d, "value", conn.receiver->metaObject()->method(conn.method).signature());
+                if (conn.receiver) 
+                    P(d, "value", conn.receiver->metaObject()->method(conn.method).signature());
+                else
+                    P(d, "value", "<invalid receiver>");
                 P(d, "numchild", "0");
             d.endHash();
             d.beginHash();

src/plugins/debugger/debuggeroutputwindow.cpp

@@ -285,6 +285,7 @@ void DebuggerOutputWindow::showOutput(const QString &prefix, const QString &outp
 
 void DebuggerOutputWindow::showInput(const QString &prefix, const QString &input)
 {
+    Q_UNUSED(prefix);
     m_inputText->append(input);
     QTextCursor cursor = m_inputText->textCursor();
     cursor.movePosition(QTextCursor::End);