Make share/qtcreator/cplusplus/examples compilable

Builds now, but does not link (which is fine). And unrelated,
unintentional warnings were removed.

Change-Id: I6ece33933bc20e6e36fb3859de7c2b774b0e67d5
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: Cristian Adam <cristian.adam@qt.io>

share/qtcreator/cplusplus/examples/CMakeLists.txt

@@ -11,7 +11,10 @@ set(CMAKE_AUTORCC ON)
 set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
-find_package(Qt5 COMPONENTS Widgets REQUIRED)
+find_package(QT NAMES Qt6 Qt5 COMPONENTS Core Gui Widgets REQUIRED)
+find_package(Qt${QT_VERSION_MAJOR} COMPONENTS Core Gui Widgets REQUIRED)
+
+set_property(SOURCE clazy_example.cpp icontest.cpp PROPERTY SKIP_AUTOMOC ON)
 
 add_executable(examples
   clazy_example.cpp
@@ -20,4 +23,4 @@ add_executable(examples
   tidy_example.h
 )
 
-target_link_libraries(examples PRIVATE Qt5::Widgets)
+target_link_libraries(examples PRIVATE Qt${QT_VERSION_MAJOR}::Widgets)

share/qtcreator/cplusplus/examples/clazy_example.cpp

@@ -113,9 +113,6 @@ TestObject::TestObject()
     for (auto obj : list) {
     }
 
-    // -Wclazy-qdatetime-utc
-    QDateTime::currentDateTime().toTime_t();
-
     // -Wclazy-qfileinfo-exists
     // -Wclazy-qstring-allocations
     QFileInfo("filename").exists();
@@ -134,8 +131,5 @@ TestObject::TestObject()
     str.mid(5).toInt(&ok);
 
     // -Wclazy-qstring-arg
-    QString("%1 %2").arg("1").arg("2");
+    (void) QString("%1 %2").arg("1").arg("2");
 }
-
-// Note: A fatal error like an unresolved include will make clazy stop emitting any diagnostics.
-// #include "clazy_example.moc"

share/qtcreator/cplusplus/examples/icontest.cpp

@@ -27,12 +27,13 @@
 
 #define Macro
 
-class Class {
+class Class : public QObject {
     Q_OBJECT
+
 public:
-    Q_PROPERTY(bool property READ readProperty CONSTANT);
-    void publicFunction();
-    void static publicStaticFunction();
+    Q_PROPERTY(int property READ publicStaticFunction CONSTANT)
+    int publicFunction() { return 0; }
+    int static publicStaticFunction()  { return 0; }
     template<int> void publicTemplateFunction();
     template<int> void static publicStaticTemplateFunction();
 
@@ -43,8 +44,8 @@ signals:
     void signal();
 
 public slots:
-    void publicSlot();
-    template<int> void publicTemplateSlot();
+    void publicSlot() {}
+    // template<int> void publicTemplateSlot() {}
 
 protected:
     void protectedFunction();
@@ -56,8 +57,8 @@ protected:
     int static protectedStaticVariable;
 
 protected slots:
-    void protectedSlot();
-    template<int> void protectedTemplateSlot();
+    void protectedSlot() {}
+    // template<int> void protectedTemplateSlot() {}
 
 private:
     void privateFunction();
@@ -67,9 +68,10 @@ private:
     template<int> void static privateStaticTemplateFunction();
 
 private slots:
-    void privateSlot();
-    template<int> void privateTemplateSlot();
+    void privateSlot() {}
+    // template<int> void privateTemplateSlot() {}
 
+private:
     int privateVariable;
     int static privateStaticVariable;
 };

share/qtcreator/cplusplus/examples/tidy_example.cpp

@@ -71,7 +71,7 @@ public:
     // misc-noexcept-move-constructor
     // misc-unconventional-assign-operator
     // misc-unused-parameters
-    Base operator=(Base &&param) {}
+    Base operator=(Base &&param) { return {}; }
     virtual int function()
     {
         // modernize-use-nullptr
@@ -116,7 +116,7 @@ void afterMove(Base &&base)
     Base moved(std::move(base));
 
     // misc-use-after-move
-    base.value;
+    (void) base.value;
 }
 
 // google-runtime-references
@@ -144,7 +144,7 @@ public:
         auto b = {0.5f, 0.5f, 0.5f, 0.5f};
 
         // misc-fold-init-type
-        std::accumulate(std::begin(b), std::end(b), 0);
+        (void) std::accumulate(std::begin(b), std::end(b), 0);
 
         // google-readability-casting, misc-incorrect-roundings
         auto c = (int)(getDouble() + 0.5);
@@ -197,6 +197,7 @@ public:
         std::system("echo ");
         // cert-err52-cpp
         setjmp(nullptr);
+        return 0;
     }
 
     // google-default-arguments
@@ -251,7 +252,7 @@ int main()
     // modernize-loop-convert
     for (int i = 0; i < 3; ++i) {
         // cppcoreguidelines-pro-bounds-constant-array-index
-        arr[i];
+        (void) arr[i];
     }
 
     std::vector<std::pair<int, int>> w;