Fix #13236: False positive: unusedFunction reported when SLOT() is used in qt code (danmar#7270)

Author: olabetskyi

cfg/qt.cfg

@@ -59,8 +59,8 @@
   <reflection>
     <call arg="2">invokeMethod</call>
   </reflection>
-  <define name="SIGNAL(X)" value="#X"/>
-  <define name="SLOT(X)" value="#X"/>
+  <define name="SIGNAL(X)" value="X"/>
+  <define name="SLOT(X)" value="X"/>
   <!-- T qAbs(const T &t) -->
   <function name="qAbs">
     <pure/>

test/cfg/qt.cpp

@@ -811,4 +811,18 @@ struct BQObject_missingOverride { // #13406
 
 struct DQObject_missingOverride : BQObject_missingOverride {
     Q_OBJECT
-};
+};
+
+namespace {
+    class TestUnusedFunction : public QObject { // #13236
+        TestUnusedFunction();
+        // cppcheck-suppress functionStatic
+        void doStuff();
+    };
+
+    TestUnusedFunction::TestUnusedFunction() {
+        QObject::connect(this, SIGNAL(doStuff()), SLOT(doStuff()));
+    }
+
+    void TestUnusedFunction::doStuff() {} // Should not warn here with unusedFunction
+}