De-duplicate vtables, part I: exported private classes

By making the destructor (usually the first non-inline, non-pure,
virtual function, and therefore the trigger for most compilers to
emit the vtable and type_info structures for the class in that TU)
out-of-line, vtables and, more importantly, type_info structures for
the class are pinned to a single TU. This prevents false negative
dynamic_cast and catch evaluation.

In this first batch, we de-inline destructors of exported private
classes.

Since they are already exported, users of these classes are unaffected
by the change, and since it's private API, we don't need to avoid
adding code to the out-of-line destructor until Qt 6.

Change-Id: I450707877d2cb6a77f79ae1dd355facb98d6c517
Reported-by: Volker Krause <[email protected]>
Task-number: QTBUG-45582
Reviewed-by: Oswald Buddenhagen <[email protected]>
Reviewed-by: Friedemann Kleint <[email protected]>
Reviewed-by: Lars Knoll <[email protected]>
Reviewed-by: Konstantin Ritt <[email protected]>
Reviewed-by: Thiago Macieira <[email protected]>

1 files changed, 4 insertions, 0 deletions

diff --git a/src/gui/opengl/qopenglpaintdevice.cpp b/src/gui/opengl/qopenglpaintdevice.cpp
index c0657feaa0a..e509b26a955 100644
--- a/src/gui/opengl/qopenglpaintdevice.cpp
+++ b/src/gui/opengl/qopenglpaintdevice.cpp
@@ -169,6 +169,10 @@ QOpenGLPaintDevicePrivate::QOpenGLPaintDevicePrivate(const QSize &sz)
 {
 }
 
+QOpenGLPaintDevicePrivate::~QOpenGLPaintDevicePrivate()
+{
+}
+
 class QOpenGLEngineThreadStorage
 {
 public: