Migrate to autogenerated cpp exports

Use autogeneratedd cpp exports in the Gui module.

Task-number: QTBUG-90492
Change-Id: Ifc5d3dd138ef9f86f6003ed9adb66a9eefdd64db
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>

src/gui/CMakeLists.txt

@@ -277,6 +277,7 @@ qt_internal_add_module(Gui
         "painting/qdrawhelper.cpp" # special case
     PRECOMPILED_HEADER
         "kernel/qt_gui_pch.h"
+    GENERATE_CPP_EXPORTS
 )
 
 # Resources:

src/gui/kernel/qt_gui_pch.h

@@ -48,6 +48,7 @@
 #include "../../corelib/global/qt_pch.h"
 
 #if defined __cplusplus
+#include <qtguiexports.h>
 #include <qtguiglobal.h>
 #include <qguiapplication.h>
 #include <qbitmap.h>

src/gui/kernel/qtguiglobal.h

@@ -42,19 +42,6 @@
 
 #include <QtCore/qglobal.h>
 #include <QtGui/qtgui-config.h>
-
-QT_BEGIN_NAMESPACE
-
-#ifndef QT_STATIC
-#  if defined(QT_BUILD_GUI_LIB)
-#    define Q_GUI_EXPORT Q_DECL_EXPORT
-#  else
-#    define Q_GUI_EXPORT Q_DECL_IMPORT
-#  endif
-#else
-#  define Q_GUI_EXPORT
-#endif
-
-QT_END_NAMESPACE
+#include <QtGui/qtguiexports.h>
 
 #endif // QTGUIGLOBAL_H