QOpenGLContext: de-inline virtual dtors of private classes

... pinning the vtables to a single TU instead of duplicating them for
every user.

Pick-to: 6.4
Task-number: QTBUG-45582
Change-Id: I728a5c47edaafe7ef4fdca1db8d0247ed4be9713
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>

src/gui/kernel/qopenglcontext.cpp

@@ -360,6 +360,14 @@ bool QOpenGLContext::create()
     return isValid();
 }
 
+QOpenGLContextPrivate::~QOpenGLContextPrivate()
+{
+    //do not delete the QOpenGLContext handle here as it is deleted in
+    //QWidgetPrivate::deleteTLSysExtra()
+
+    delete versionFunctions;
+}
+
 void QOpenGLContextPrivate::adopt(QPlatformOpenGLContext *context)
 {
     Q_Q(QOpenGLContext);
@@ -995,6 +1003,9 @@ QOpenGLContextGroup *QOpenGLContextGroup::currentContextGroup()
     return current ? current->shareGroup() : nullptr;
 }
 
+QOpenGLContextGroupPrivate::~QOpenGLContextGroupPrivate()
+    = default;
+
 void QOpenGLContextGroupPrivate::addContext(QOpenGLContext *ctx)
 {
     const auto locker = qt_scoped_lock(m_mutex);
@@ -1136,6 +1147,10 @@ void QOpenGLSharedResource::free()
     \inmodule QtGui
 
 */
+
+QOpenGLSharedResourceGuard::~QOpenGLSharedResourceGuard()
+    = default;
+
 void QOpenGLSharedResourceGuard::freeResource(QOpenGLContext *context)
 {
     if (m_id) {
@@ -1235,6 +1250,9 @@ void QOpenGLMultiGroupSharedResource::cleanup(QOpenGLContextGroup *group, QOpenG
     m_groups.removeOne(group);
 }
 
+QOpenGLContextVersionFunctionHelper::~QOpenGLContextVersionFunctionHelper()
+    = default;
+
 #ifndef QT_NO_DEBUG_STREAM
 QDebug operator<<(QDebug debug, const QOpenGLContext *ctx)
 {

src/gui/kernel/qopenglcontext_p.h

@@ -74,6 +74,7 @@ public:
         , m_func(func)
     {
     }
+    ~QOpenGLSharedResourceGuard() override;
 
     GLuint id() const { return m_id; }
 
@@ -99,6 +100,7 @@ public:
         , m_refs(0)
     {
     }
+    ~QOpenGLContextGroupPrivate() override;
 
     void addContext(QOpenGLContext *ctx);
     void removeContext(QOpenGLContext *ctx);
@@ -160,7 +162,7 @@ class QOpenGLVertexArrayObjectHelper;
 class Q_GUI_EXPORT QOpenGLContextVersionFunctionHelper
 {
 public:
-    virtual ~QOpenGLContextVersionFunctionHelper() {}
+    virtual ~QOpenGLContextVersionFunctionHelper();
 };
 
 class Q_GUI_EXPORT QOpenGLContextPrivate : public QObjectPrivate
@@ -190,13 +192,7 @@ public:
         requestedFormat = QSurfaceFormat::defaultFormat();
     }
 
-    ~QOpenGLContextPrivate()
+    ~QOpenGLContextPrivate() override;
-    {
-        //do not delete the QOpenGLContext handle here as it is deleted in
-        //QWidgetPrivate::deleteTLSysExtra()
-
-        delete versionFunctions;
-    }
 
     void adopt(QPlatformOpenGLContext *);