QtWidgets: Fix errors about fields from anonymous namespaces (-Werror=subobject-linkage)

Move types to QtPrivate, fixing errors like:

error: QCalendarWidgetPrivate’ has a field
QCalendarWidgetPrivate::m_model whose type uses the anonymous namespace [-Werror=subobject-linkage]

The error appears in CMake Unity (Jumbo) builds apparently
due to multiple anonymous namespaces per file.

Task-number: QTBUG-109394
Pick-to: 6.5
Change-Id: Id678af4db5633b1b2267425c7751f1312935d5d5
Reviewed-by: Axel Spoerl <axel.spoerl@qt.io>
Reviewed-by: Jan Arve Sæther <jan-arve.saether@qt.io>

src/printsupport/widgets/qprintpreviewwidget.cpp

@@ -14,7 +14,7 @@
 
 QT_BEGIN_NAMESPACE
 
-namespace {
+namespace QtPrivate {
 class PageItem : public QGraphicsItem
 {
 public:
@@ -136,7 +136,10 @@ protected:
     }
 };
 
-} // anonymous namespace
+} // namespace QtPrivate
+
+using GraphicsView = QtPrivate::GraphicsView;
+using PageItem = QtPrivate::PageItem;
 
 class QPrintPreviewWidgetPrivate : public QWidgetPrivate
 {

src/widgets/dialogs/qcolordialog.cpp

@@ -49,13 +49,21 @@ QT_BEGIN_NAMESPACE
 
 using namespace Qt::StringLiterals;
 
-namespace {
+namespace QtPrivate {
 class QColorLuminancePicker;
 class QColorPicker;
 class QColorShower;
 class QWellArray;
+class QColorWell;
 class QColorPickingEventFilter;
-} // unnamed namespace
+} // namespace QtPrivate
+
+using QColorLuminancePicker = QtPrivate::QColorLuminancePicker;
+using QColorPicker = QtPrivate::QColorPicker;
+using QColorShower = QtPrivate::QColorShower;
+using QWellArray = QtPrivate::QWellArray;
+using QColorWell = QtPrivate::QColorWell;
+using QColorPickingEventFilter = QtPrivate::QColorPickingEventFilter;
 
 class QColorDialogPrivate : public QDialogPrivate
 {
@@ -150,7 +158,7 @@ private:
 
 //////////// QWellArray BEGIN
 
-namespace {
+namespace QtPrivate {
 
 class QWellArray : public QWidget
 {
@@ -465,7 +473,7 @@ void QWellArray::keyPressEvent(QKeyEvent* e)
         return;
     }
 
-}
+} // namespace QtPrivate
 
 //////////// QWellArray END
 
@@ -555,7 +563,7 @@ static inline void rgb2hsv(QRgb rgb, int &h, int &s, int &v)
     c.getHsv(&h, &s, &v);
 }
 
-namespace {
+namespace QtPrivate {
 
 class QColorWell : public QWellArray
 {
@@ -705,9 +713,13 @@ private:
     bool crossVisible;
 };
 
+} // namespace QtPrivate
+
 static int pWidth = 220;
 static int pHeight = 200;
 
+namespace QtPrivate {
+
 class QColorLuminancePicker : public QWidget
 {
     Q_OBJECT
@@ -1308,7 +1320,7 @@ QColorShower::QColorShower(QColorDialog *parent)
     retranslateStrings();
 }
 
-} // unnamed namespace
+} // namespace QtPrivate
 
 inline QRgb QColorDialogPrivate::currentColor() const { return cs->currentColor(); }
 inline int QColorDialogPrivate::currentAlpha() const { return cs->currentAlpha(); }

src/widgets/dialogs/qerrormessage.cpp

@@ -28,17 +28,15 @@ QT_BEGIN_NAMESPACE
 
 using namespace Qt::StringLiterals;
 
-namespace {
-struct Message {
-    QString content;
-    QString type;
-};
-}
-
 class QErrorMessagePrivate : public QDialogPrivate
 {
     Q_DECLARE_PUBLIC(QErrorMessage)
 public:
+    struct Message {
+        QString content;
+        QString type;
+    };
+
     QPushButton * ok;
     QCheckBox * again;
     QTextEdit * errors;

src/widgets/kernel/qformlayout.cpp

@@ -13,7 +13,7 @@
 
 QT_BEGIN_NAMESPACE
 
-namespace {
+namespace QtPrivate {
 // Fixed column matrix, stores items as [i11, i12, i21, i22...],
 // with FORTRAN-style index operator(r, c).
 template <class T, int NumColumns>
@@ -152,7 +152,7 @@ class QFormLayoutPrivate : public QLayoutPrivate
     Q_DECLARE_PUBLIC(QFormLayout)
 
 public:
-    typedef FixedColumnMatrix<QFormLayoutItem *, ColumnCount> ItemMatrix;
+    typedef QtPrivate::FixedColumnMatrix<QFormLayoutItem *, ColumnCount> ItemMatrix;
 
     QFormLayoutPrivate();
     ~QFormLayoutPrivate() { }

src/widgets/widgets/qcalendarwidget.cpp

@@ -37,13 +37,13 @@ enum {
     MinimumDayOffset = 1
 };
 
-namespace {
-
 static QString formatNumber(int number, int fieldWidth)
 {
     return QString::number(number).rightJustified(fieldWidth, u'0');
 }
 
+namespace QtPrivate {
+
 class QCalendarDateSectionValidator
 {
 public:
@@ -398,9 +398,11 @@ struct SectionToken {
     QCalendarDateSectionValidator *validator;
     int repeat;
 };
-} // unnamed namespace
-Q_DECLARE_TYPEINFO(SectionToken, Q_PRIMITIVE_TYPE);
-namespace {
+} // namespace QtPrivate
+
+Q_DECLARE_TYPEINFO(QtPrivate::SectionToken, Q_PRIMITIVE_TYPE);
+
+namespace QtPrivate {
 
 class QCalendarDateValidator
 {
@@ -1606,7 +1608,20 @@ protected:
     }
 };
 
-} // unnamed namespace
+} // namespace QtPrivate
+
+using QCalendarDateSectionValidator = QtPrivate::QCalendarDateSectionValidator;
+using QCalendarDayValidator = QtPrivate::QCalendarDayValidator;
+using QCalendarMonthValidator = QtPrivate::QCalendarMonthValidator;
+using QCalendarYearValidator = QtPrivate::QCalendarYearValidator;
+using QCalendarDateValidator = QtPrivate::QCalendarDateValidator;
+using QPrevNextCalButton = QtPrivate::QPrevNextCalButton;
+using QCalendarDelegate = QtPrivate::QCalendarDelegate;
+using QCalToolButton = QtPrivate::QCalToolButton;
+using QCalendarDelegate = QtPrivate::QCalendarDelegate;
+using QCalendarModel = QtPrivate::QCalendarModel;
+using QCalendarView = QtPrivate::QCalendarView;
+using QCalendarTextNavigator = QtPrivate::QCalendarTextNavigator;
 
 class QCalendarWidgetPrivate : public QWidgetPrivate
 {