diff --git a/src/widgets/dialogs/qwizard.cpp b/src/widgets/dialogs/qwizard.cpp
index b9906f13da..996e5819ff 100644
--- a/src/widgets/dialogs/qwizard.cpp
+++ b/src/widgets/dialogs/qwizard.cpp
@@ -800,7 +800,7 @@ void QWizardPrivate::addField(const QWizardField &field)
     myField.resolve(defaultPropertyTable);
 
     if (fieldIndexMap.contains(myField.name)) {
-        qWarning("QWizardPage::addField: Duplicate field '%s'", qPrintable(myField.name));
+        qWarning("QWizardPage::addField: Duplicate field '%ls'", qUtf16Printable(myField.name));
         return;
     }
 
@@ -2516,7 +2516,7 @@ void QWizard::setField(const QString &name, const QVariant &value)
         return;
     }
 
-    qWarning("QWizard::setField: No such field '%s'", qPrintable(name));
+    qWarning("QWizard::setField: No such field '%ls'", qUtf16Printable(name));
 }
 
 /*!
@@ -2536,7 +2536,7 @@ QVariant QWizard::field(const QString &name) const
         return field.object->property(field.property);
     }
 
-    qWarning("QWizard::field: No such field '%s'", qPrintable(name));
+    qWarning("QWizard::field: No such field '%ls'", qUtf16Printable(name));
     return QVariant();
 }
 
diff --git a/src/widgets/graphicsview/qgraphicsanchorlayout_p.cpp b/src/widgets/graphicsview/qgraphicsanchorlayout_p.cpp
index dac8e61645..04a844ce4e 100644
--- a/src/widgets/graphicsview/qgraphicsanchorlayout_p.cpp
+++ b/src/widgets/graphicsview/qgraphicsanchorlayout_p.cpp
@@ -2983,7 +2983,7 @@ void QGraphicsAnchorLayoutPrivate::dumpGraph(const QString &name)
 {
     QFile file(QString::fromLatin1("anchorlayout.%1.dot").arg(name));
     if (!file.open(QIODevice::WriteOnly | QIODevice::Text | QIODevice::Truncate))
-        qWarning("Could not write to %s", file.fileName().toLocal8Bit().constData());
+        qWarning("Could not write to %ls", qUtf16Printable(file.fileName()));
 
     QString str = QString::fromLatin1("digraph anchorlayout {\nnode [shape=\"rect\"]\n%1}");
     QString dotContents = graph[0].serializeToDot();
diff --git a/src/widgets/kernel/qlayout.cpp b/src/widgets/kernel/qlayout.cpp
index e74f17b6f7..b6d87dc17e 100644
--- a/src/widgets/kernel/qlayout.cpp
+++ b/src/widgets/kernel/qlayout.cpp
@@ -130,10 +130,10 @@ QLayout::QLayout(QLayoutPrivate &dd, QLayout *lay, QWidget *w)
         lay->addItem(this);
     } else if (w) {
         if (w->layout()) {
-            qWarning("QLayout: Attempting to add QLayout \"%s\" to %s \"%s\", which"
+            qWarning("QLayout: Attempting to add QLayout \"%ls\" to %s \"%ls\", which"
                      " already has a layout",
-                     qPrintable(QObject::objectName()), w->metaObject()->className(),
-                     w->objectName().toLocal8Bit().data());
+                     qUtf16Printable(QObject::objectName()), w->metaObject()->className(),
+                     qUtf16Printable(w->objectName()));
             setParent(0);
         } else {
             d->topLevel = true;
@@ -777,8 +777,8 @@ QLayout::~QLayout()
 void QLayout::addChildLayout(QLayout *l)
 {
     if (l->parent()) {
-        qWarning("QLayout::addChildLayout: layout \"%s\" already has a parent",
-                 l->objectName().toLocal8Bit().data());
+        qWarning("QLayout::addChildLayout: layout \"%ls\" already has a parent",
+                 qUtf16Printable(l->objectName()));
         return;
     }
     l->setParent(this);
@@ -827,8 +827,8 @@ void QLayoutPrivate::reparentChildWidgets(QWidget *mw)
             QWidget *pw = w->parentWidget();
 #ifdef QT_DEBUG
             if (pw && pw != mw && layoutDebug()) {
-                qWarning("QLayout::addChildLayout: widget %s \"%s\" in wrong parent; moved to correct parent",
-                         w->metaObject()->className(), w->objectName().toLocal8Bit().data());
+                qWarning("QLayout::addChildLayout: widget %s \"%ls\" in wrong parent; moved to correct parent",
+                         w->metaObject()->className(), qUtf16Printable(w->objectName()));
             }
 #endif
             bool needShow = mwVisible && !(w->isHidden() && w->testAttribute(Qt::WA_WState_ExplicitShowHide));
@@ -850,14 +850,14 @@ bool QLayoutPrivate::checkWidget(QWidget *widget) const
 {
     Q_Q(const QLayout);
     if (!widget) {
-        qWarning("QLayout: Cannot add a null widget to %s/%s", q->metaObject()->className(),
-                  qPrintable(q->objectName()));
+        qWarning("QLayout: Cannot add a null widget to %s/%ls", q->metaObject()->className(),
+                  qUtf16Printable(q->objectName()));
         return false;
     }
     if (widget == q->parentWidget()) {
-        qWarning("QLayout: Cannot add parent widget %s/%s to its child layout %s/%s",
-                  widget->metaObject()->className(), qPrintable(widget->objectName()),
-                  q->metaObject()->className(), qPrintable(q->objectName()));
+        qWarning("QLayout: Cannot add parent widget %s/%ls to its child layout %s/%ls",
+                  widget->metaObject()->className(), qUtf16Printable(widget->objectName()),
+                  q->metaObject()->className(), qUtf16Printable(q->objectName()));
         return false;
     }
     return true;
@@ -871,13 +871,13 @@ bool QLayoutPrivate::checkLayout(QLayout *otherLayout) const
 {
     Q_Q(const QLayout);
     if (!otherLayout) {
-        qWarning("QLayout: Cannot add a null layout to %s/%s", q->metaObject()->className(),
-                  qPrintable(q->objectName()));
+        qWarning("QLayout: Cannot add a null layout to %s/%ls",
+                 q->metaObject()->className(), qUtf16Printable(q->objectName()));
         return false;
     }
     if (otherLayout == q) {
-        qWarning("QLayout: Cannot add layout %s/%s to itself", q->metaObject()->className(),
-                  qPrintable(q->objectName()));
+        qWarning("QLayout: Cannot add layout %s/%ls to itself",
+                 q->metaObject()->className(), qUtf16Printable(q->objectName()));
         return false;
     }
     return true;
@@ -903,16 +903,16 @@ void QLayout::addChildWidget(QWidget *w)
         if (l && removeWidgetRecursively(l, w)) {
 #ifdef QT_DEBUG
             if (layoutDebug())
-                qWarning("QLayout::addChildWidget: %s \"%s\" is already in a layout; moved to new layout",
-                         w->metaObject()->className(), w->objectName().toLocal8Bit().data());
+                qWarning("QLayout::addChildWidget: %s \"%ls\" is already in a layout; moved to new layout",
+                         w->metaObject()->className(), qUtf16Printable(w->objectName()));
 #endif
         }
     }
     if (pw && mw && pw != mw) {
 #ifdef QT_DEBUG
             if (layoutDebug())
-                qWarning("QLayout::addChildWidget: %s \"%s\" in wrong parent; moved to correct parent",
-                         w->metaObject()->className(), w->objectName().toLocal8Bit().data());
+                qWarning("QLayout::addChildWidget: %s \"%ls\" in wrong parent; moved to correct parent",
+                         w->metaObject()->className(), qUtf16Printable(w->objectName()));
 #endif
         pw = 0;
     }
@@ -1065,8 +1065,8 @@ bool QLayout::activate()
         return false;
     QWidget *mw = static_cast<QWidget*>(parent());
     if (mw == 0) {
-        qWarning("QLayout::activate: %s \"%s\" does not have a main widget",
-                 QObject::metaObject()->className(), QObject::objectName().toLocal8Bit().data());
+        qWarning("QLayout::activate: %s \"%ls\" does not have a main widget",
+                 metaObject()->className(), qUtf16Printable(objectName()));
         return false;
     }
     activateRecursiveHelper(this);
diff --git a/src/widgets/widgets/qdockarealayout.cpp b/src/widgets/widgets/qdockarealayout.cpp
index 06c20adb9d..6c38043e01 100644
--- a/src/widgets/widgets/qdockarealayout.cpp
+++ b/src/widgets/widgets/qdockarealayout.cpp
@@ -1803,8 +1803,8 @@ void QDockAreaLayoutInfo::saveState(QDataStream &stream) const
             QWidget *w = item.widgetItem->widget();
             QString name = w->objectName();
             if (name.isEmpty()) {
-                qWarning("QMainWindow::saveState(): 'objectName' not set for QDockWidget %p '%s;",
-                         w, qPrintable(w->windowTitle()));
+                qWarning("QMainWindow::saveState(): 'objectName' not set for QDockWidget %p '%ls;",
+                         w, qUtf16Printable(w->windowTitle()));
             }
             stream << name;