Merge remote-tracking branch 'origin/dev' into wip/cmake

Change-Id: Ia1da879a7bd8f71a649661a1844144dd67d60b3a

56 files changed, 119 insertions, 913 deletions

diff --git a/src/plugins/bearer/android/src/qandroidbearerengine.cpp b/src/plugins/bearer/android/src/qandroidbearerengine.cpp
index a43ed69570..ad9895e0cf 100644
--- a/src/plugins/bearer/android/src/qandroidbearerengine.cpp
+++ b/src/plugins/bearer/android/src/qandroidbearerengine.cpp
@@ -38,7 +38,7 @@
 ****************************************************************************/
 
 #include "qandroidbearerengine.h"
-#include "../../qnetworksession_impl.h"
+#include <private/qnetworksession_impl_p.h>
 #include "wrappers/androidconnectivitymanager.h"
 
 #ifndef QT_NO_BEARERMANAGEMENT
diff --git a/src/plugins/bearer/android/src/qandroidbearerengine.h b/src/plugins/bearer/android/src/qandroidbearerengine.h
index 837b02232d..867d04d886 100644
--- a/src/plugins/bearer/android/src/qandroidbearerengine.h
+++ b/src/plugins/bearer/android/src/qandroidbearerengine.h
@@ -40,7 +40,7 @@
 #ifndef QANDROIDBEARERENGINE_H
 #define QANDROIDBEARERENGINE_H
 
-#include "../../qbearerengine_impl.h"
+#include <private/qbearerengine_impl_p.h>
 
 #include <QAbstractEventDispatcher>
 #include <QAbstractNativeEventFilter>
diff --git a/src/plugins/bearer/android/src/src.pro b/src/plugins/bearer/android/src/src.pro
index eb0738386c..fcd599dffe 100644
--- a/src/plugins/bearer/android/src/src.pro
+++ b/src/plugins/bearer/android/src/src.pro
@@ -2,13 +2,10 @@ TARGET = qandroidbearer
 
 QT = core-private network-private
 
-HEADERS += qandroidbearerengine.h \
-           ../../qnetworksession_impl.h \
-           ../../qbearerengine_impl.h
+HEADERS += qandroidbearerengine.h
 
 SOURCES += main.cpp \
-           qandroidbearerengine.cpp \
-           ../../qnetworksession_impl.cpp
+           qandroidbearerengine.cpp
 
 include(wrappers/wrappers.pri)
 
diff --git a/src/plugins/bearer/connman/connman.pro b/src/plugins/bearer/connman/connman.pro
index 065ed11dad..d6577e9d7f 100644
--- a/src/plugins/bearer/connman/connman.pro
+++ b/src/plugins/bearer/connman/connman.pro
@@ -4,15 +4,12 @@ QT = core network-private dbus
 
 HEADERS += qconnmanservice_linux_p.h \
            ../linux_common/qofonoservice_linux_p.h \
-           qconnmanengine.h \
-           ../qnetworksession_impl.h \
-           ../qbearerengine_impl.h
+           qconnmanengine.h
 
 SOURCES += main.cpp \
            qconnmanservice_linux.cpp \
            ../linux_common/qofonoservice_linux.cpp \
-           qconnmanengine.cpp \
-           ../qnetworksession_impl.cpp
+           qconnmanengine.cpp
 
 OTHER_FILES += connman.json
 
diff --git a/src/plugins/bearer/connman/qconnmanengine.cpp b/src/plugins/bearer/connman/qconnmanengine.cpp
index 8b2076bd18..a673834825 100644
--- a/src/plugins/bearer/connman/qconnmanengine.cpp
+++ b/src/plugins/bearer/connman/qconnmanengine.cpp
@@ -39,7 +39,7 @@
 
 #include "qconnmanengine.h"
 #include "qconnmanservice_linux_p.h"
-#include "../qnetworksession_impl.h"
+#include <private/qnetworksession_impl_p.h>
 
 #include <QtNetwork/private/qnetworkconfiguration_p.h>
 
diff --git a/src/plugins/bearer/connman/qconnmanengine.h b/src/plugins/bearer/connman/qconnmanengine.h
index ef80d38fa2..eb79dbec1b 100644
--- a/src/plugins/bearer/connman/qconnmanengine.h
+++ b/src/plugins/bearer/connman/qconnmanengine.h
@@ -51,7 +51,7 @@
 // We mean it.
 //
 
-#include "../qbearerengine_impl.h"
+#include <private/qbearerengine_impl_p.h>
 
 #include "qconnmanservice_linux_p.h"
 #include "../linux_common/qofonoservice_linux_p.h"
diff --git a/src/plugins/bearer/corewlan/corewlan.pro b/src/plugins/bearer/corewlan/corewlan.pro
index 1dc09ebdd6..4f08eaba71 100644
--- a/src/plugins/bearer/corewlan/corewlan.pro
+++ b/src/plugins/bearer/corewlan/corewlan.pro
@@ -7,12 +7,9 @@ qtConfig(corewlan) {
     LIBS += -framework CoreWLAN -framework Security
 }
 
-HEADERS += qcorewlanengine.h \
-           ../qnetworksession_impl.h \
-           ../qbearerengine_impl.h
+HEADERS += qcorewlanengine.h
 
-SOURCES += main.cpp \
-           ../qnetworksession_impl.cpp
+SOURCES += main.cpp
 
 OBJECTIVE_SOURCES += qcorewlanengine.mm
 
diff --git a/src/plugins/bearer/corewlan/qcorewlanengine.h b/src/plugins/bearer/corewlan/qcorewlanengine.h
index 6dddee66a4..8775474c09 100644
--- a/src/plugins/bearer/corewlan/qcorewlanengine.h
+++ b/src/plugins/bearer/corewlan/qcorewlanengine.h
@@ -40,7 +40,7 @@
 #ifndef QCOREWLANENGINE_H
 #define QCOREWLANENGINE_H
 
-#include "../qbearerengine_impl.h"
+#include <private/qbearerengine_impl_p.h>
 
 #include <QMap>
 #include <QTimer>
diff --git a/src/plugins/bearer/corewlan/qcorewlanengine.mm b/src/plugins/bearer/corewlan/qcorewlanengine.mm
index 4644b5af9f..01c6df74d5 100644
--- a/src/plugins/bearer/corewlan/qcorewlanengine.mm
+++ b/src/plugins/bearer/corewlan/qcorewlanengine.mm
@@ -38,7 +38,7 @@
 ****************************************************************************/
 
 #include "qcorewlanengine.h"
-#include "../qnetworksession_impl.h"
+#include <private/qnetworksession_impl_p.h>
 
 #include <QtNetwork/private/qnetworkconfiguration_p.h>
 
@@ -62,12 +62,11 @@ extern "C" { // Otherwise it won't find CWKeychain* symbols at link time
 #include <ifaddrs.h>
 
 @interface QT_MANGLE_NAMESPACE(QNSListener) : NSObject <CWEventDelegate>
-
 @property (assign) QCoreWlanEngine* engine;
-
 @end
+QT_NAMESPACE_ALIAS_OBJC_CLASS(QNSListener);
 
-@implementation QT_MANGLE_NAMESPACE(QNSListener) {
+@implementation QNSListener {
     NSNotificationCenter *notificationCenter;
     CWWiFiClient *client;
     QCoreWlanEngine *engine;
@@ -88,7 +87,7 @@ extern "C" { // Otherwise it won't find CWKeychain* symbols at link time
     return self;
 }
 
-static QT_MANGLE_NAMESPACE(QNSListener) *listener = 0;
+static QNSListener *listener = 0;
 
 -(void)dealloc
 {
@@ -415,7 +414,7 @@ void QCoreWlanEngine::initialize()
     QMacAutoReleasePool pool;
 
     if ([[CWWiFiClient interfaceNames] count] > 0 && !listener) {
-        listener = [[QT_MANGLE_NAMESPACE(QNSListener) alloc] init];
+        listener = [QNSListener alloc] init];
         listener.engine = this;
         hasWifi = true;
     } else {
diff --git a/src/plugins/bearer/generic/generic.pro b/src/plugins/bearer/generic/generic.pro
index f30bdc4951..14b858b301 100644
--- a/src/plugins/bearer/generic/generic.pro
+++ b/src/plugins/bearer/generic/generic.pro
@@ -3,11 +3,8 @@ TARGET = qgenericbearer
 QT = core-private network-private
 
 HEADERS += qgenericengine.h \
-           ../qnetworksession_impl.h \
-           ../qbearerengine_impl.h \
            ../platformdefs_win.h
 SOURCES += qgenericengine.cpp \
-           ../qnetworksession_impl.cpp \
            main.cpp
 
 OTHER_FILES += generic.json
diff --git a/src/plugins/bearer/generic/qgenericengine.cpp b/src/plugins/bearer/generic/qgenericengine.cpp
index b1f28849a7..a5fba15789 100644
--- a/src/plugins/bearer/generic/qgenericengine.cpp
+++ b/src/plugins/bearer/generic/qgenericengine.cpp
@@ -41,7 +41,7 @@
 #define WIN32_LEAN_AND_MEAN 1
 
 #include "qgenericengine.h"
-#include "../qnetworksession_impl.h"
+#include <private/qnetworksession_impl_p.h>
 
 #include <QtNetwork/private/qnetworkconfiguration_p.h>
 
diff --git a/src/plugins/bearer/generic/qgenericengine.h b/src/plugins/bearer/generic/qgenericengine.h
index 79c71ca7a3..6b8fb4cd0f 100644
--- a/src/plugins/bearer/generic/qgenericengine.h
+++ b/src/plugins/bearer/generic/qgenericengine.h
@@ -40,7 +40,7 @@
 #ifndef QGENERICENGINE_H
 #define QGENERICENGINE_H
 
-#include "../qbearerengine_impl.h"
+#include <private/qbearerengine_impl_p.h>
 
 #include <QMap>
 #include <QTimer>
diff --git a/src/plugins/bearer/nativewifi/nativewifi.pro b/src/plugins/bearer/nativewifi/nativewifi.pro
index da7f2da353..41bde99341 100644
--- a/src/plugins/bearer/nativewifi/nativewifi.pro
+++ b/src/plugins/bearer/nativewifi/nativewifi.pro
@@ -3,13 +3,10 @@ TARGET = qnativewifibearer
 QT = core-private network-private
 
 HEADERS += qnativewifiengine.h \
-           platformdefs.h \
-           ../qnetworksession_impl.h \
-           ../qbearerengine_impl.h
+           platformdefs.h
 
 SOURCES += main.cpp \
-           qnativewifiengine.cpp \
-           ../qnetworksession_impl.cpp
+           qnativewifiengine.cpp
 
 OTHER_FILES += nativewifi.json
 
diff --git a/src/plugins/bearer/nativewifi/qnativewifiengine.cpp b/src/plugins/bearer/nativewifi/qnativewifiengine.cpp
index 777b4eea59..ca8700e63b 100644
--- a/src/plugins/bearer/nativewifi/qnativewifiengine.cpp
+++ b/src/plugins/bearer/nativewifi/qnativewifiengine.cpp
@@ -39,7 +39,7 @@
 
 #include "qnativewifiengine.h"
 #include "platformdefs.h"
-#include "../qnetworksession_impl.h"
+#include <private/qnetworksession_impl_p.h>
 
 #include <QtNetwork/private/qnetworkconfiguration_p.h>
 
diff --git a/src/plugins/bearer/nativewifi/qnativewifiengine.h b/src/plugins/bearer/nativewifi/qnativewifiengine.h
index ab8d949c9a..24e97bf6df 100644
--- a/src/plugins/bearer/nativewifi/qnativewifiengine.h
+++ b/src/plugins/bearer/nativewifi/qnativewifiengine.h
@@ -51,7 +51,7 @@
 // We mean it.
 //
 
-#include "../qbearerengine_impl.h"
+#include <private/qbearerengine_impl_p.h>
 
 #include <QtCore/qtimer.h>
 
diff --git a/src/plugins/bearer/networkmanager/networkmanager.pro b/src/plugins/bearer/networkmanager/networkmanager.pro
index e71c93f66f..3fbad07ef5 100644
--- a/src/plugins/bearer/networkmanager/networkmanager.pro
+++ b/src/plugins/bearer/networkmanager/networkmanager.pro
@@ -4,15 +4,12 @@ QT = core network-private dbus
 
 HEADERS += qnetworkmanagerservice.h \
            qnetworkmanagerengine.h \
-           ../linux_common/qofonoservice_linux_p.h \
-           ../qnetworksession_impl.h \
-           ../qbearerengine_impl.h
+           ../linux_common/qofonoservice_linux_p.h
 
 SOURCES += main.cpp \
            qnetworkmanagerservice.cpp \
            qnetworkmanagerengine.cpp \
-           ../linux_common/qofonoservice_linux.cpp \
-           ../qnetworksession_impl.cpp
+           ../linux_common/qofonoservice_linux.cpp
 
 OTHER_FILES += networkmanager.json
 
diff --git a/src/plugins/bearer/networkmanager/qnetworkmanagerengine.cpp b/src/plugins/bearer/networkmanager/qnetworkmanagerengine.cpp
index e74b1cf744..d686bc4e51 100644
--- a/src/plugins/bearer/networkmanager/qnetworkmanagerengine.cpp
+++ b/src/plugins/bearer/networkmanager/qnetworkmanagerengine.cpp
@@ -39,7 +39,7 @@
 
 #include "qnetworkmanagerengine.h"
 #include "qnetworkmanagerservice.h"
-#include "../qnetworksession_impl.h"
+#include <private/qnetworksession_impl_p.h>
 
 #include <QtNetwork/private/qnetworkconfiguration_p.h>
 
diff --git a/src/plugins/bearer/networkmanager/qnetworkmanagerengine.h b/src/plugins/bearer/networkmanager/qnetworkmanagerengine.h
index a95c68abdf..c6c5280eca 100644
--- a/src/plugins/bearer/networkmanager/qnetworkmanagerengine.h
+++ b/src/plugins/bearer/networkmanager/qnetworkmanagerengine.h
@@ -51,7 +51,7 @@
 // We mean it.
 //
 
-#include "../qbearerengine_impl.h"
+#include <private/qbearerengine_impl_p.h>
 
 #include "qnetworkmanagerservice.h"
 
diff --git a/src/plugins/bearer/nla/nla.pro b/src/plugins/bearer/nla/nla.pro
index 76f3279d25..2582dc7cd4 100644
--- a/src/plugins/bearer/nla/nla.pro
+++ b/src/plugins/bearer/nla/nla.pro
@@ -5,13 +5,10 @@ QT = core core-private network network-private
 QMAKE_USE_PRIVATE += ws2_32
 
 HEADERS += qnlaengine.h \
-           ../platformdefs_win.h \
-           ../qnetworksession_impl.h \
-           ../qbearerengine_impl.h
+           ../platformdefs_win.h
 
 SOURCES += main.cpp \
-           qnlaengine.cpp \
-           ../qnetworksession_impl.cpp
+           qnlaengine.cpp
 
 OTHER_FILES += nla.json
 
diff --git a/src/plugins/bearer/nla/qnlaengine.cpp b/src/plugins/bearer/nla/qnlaengine.cpp
index e1e60389f1..ab3c0d0e3a 100644
--- a/src/plugins/bearer/nla/qnlaengine.cpp
+++ b/src/plugins/bearer/nla/qnlaengine.cpp
@@ -38,7 +38,7 @@
 ****************************************************************************/
 
 #include "qnlaengine.h"
-#include "../qnetworksession_impl.h"
+#include <private/qnetworksession_impl_p.h>
 
 #include <QtNetwork/private/qnetworkconfiguration_p.h>
 
diff --git a/src/plugins/bearer/nla/qnlaengine.h b/src/plugins/bearer/nla/qnlaengine.h
index ab014ff776..90efa50201 100644
--- a/src/plugins/bearer/nla/qnlaengine.h
+++ b/src/plugins/bearer/nla/qnlaengine.h
@@ -51,7 +51,7 @@
 // We mean it.
 //
 
-#include "../qbearerengine_impl.h"
+#include <private/qbearerengine_impl_p.h>
 
 #include <QtNetwork/private/qnativesocketengine_p.h>
 
diff --git a/src/plugins/bearer/qbearerengine_impl.h b/src/plugins/bearer/qbearerengine_impl.h
deleted file mode 100644
index 5c003aaaf6..0000000000
--- a/src/plugins/bearer/qbearerengine_impl.h
+++ /dev/null
@@ -1,81 +0,0 @@
-/****************************************************************************
-**
-** Copyright (C) 2016 The Qt Company Ltd.
-** Contact: https://www.qt.io/licensing/
-**
-** This file is part of the plugins of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:LGPL$
-** Commercial License Usage
-** Licensees holding valid commercial Qt licenses may use this file in
-** accordance with the commercial license agreement provided with the
-** Software or, alternatively, in accordance with the terms contained in
-** a written agreement between you and The Qt Company. For licensing terms
-** and conditions see https://www.qt.io/terms-conditions. For further
-** information use the contact form at https://www.qt.io/contact-us.
-**
-** GNU Lesser General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU Lesser
-** General Public License version 3 as published by the Free Software
-** Foundation and appearing in the file LICENSE.LGPL3 included in the
-** packaging of this file. Please review the following information to
-** ensure the GNU Lesser General Public License version 3 requirements
-** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
-**
-** GNU General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU
-** General Public License version 2.0 or (at your option) the GNU General
-** Public license version 3 or any later version approved by the KDE Free
-** Qt Foundation. The licenses are as published by the Free Software
-** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
-** included in the packaging of this file. Please review the following
-** information to ensure the GNU General Public License requirements will
-** be met: https://www.gnu.org/licenses/gpl-2.0.html and
-** https://www.gnu.org/licenses/gpl-3.0.html.
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-#ifndef QBEARERENGINE_IMPL_H
-#define QBEARERENGINE_IMPL_H
-
-#include <QtNetwork/private/qbearerengine_p.h>
-
-QT_BEGIN_NAMESPACE
-
-class QBearerEngineImpl : public QBearerEngine
-{
-    Q_OBJECT
-
-public:
-    enum ConnectionError {
-        InterfaceLookupError = 0,
-        ConnectError,
-        OperationNotSupported,
-        DisconnectionError,
-    };
-
-    QBearerEngineImpl(QObject *parent = nullptr) : QBearerEngine(parent) {}
-    ~QBearerEngineImpl() {}
-
-    virtual void connectToId(const QString &id) = 0;
-    virtual void disconnectFromId(const QString &id) = 0;
-
-    virtual QString getInterfaceFromId(const QString &id) = 0;
-
-    virtual QNetworkSession::State sessionStateForId(const QString &id) = 0;
-
-    virtual quint64 bytesWritten(const QString &) { return Q_UINT64_C(0); }
-    virtual quint64 bytesReceived(const QString &) { return Q_UINT64_C(0); }
-    virtual quint64 startTime(const QString &) { return Q_UINT64_C(0); }
-
-Q_SIGNALS:
-    void connectionError(const QString &id, QBearerEngineImpl::ConnectionError error);
-};
-
-QT_END_NAMESPACE
-
-Q_DECLARE_METATYPE(QBearerEngineImpl::ConnectionError)
-
-#endif // QBEARERENGINE_IMPL_H
diff --git a/src/plugins/bearer/qnetworksession_impl.cpp b/src/plugins/bearer/qnetworksession_impl.cpp
deleted file mode 100644
index c6b678ab20..0000000000
--- a/src/plugins/bearer/qnetworksession_impl.cpp
+++ /dev/null
@@ -1,435 +0,0 @@
-/****************************************************************************
-**
-** Copyright (C) 2016 The Qt Company Ltd.
-** Contact: https://www.qt.io/licensing/
-**
-** This file is part of the plugins of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:LGPL$
-** Commercial License Usage
-** Licensees holding valid commercial Qt licenses may use this file in
-** accordance with the commercial license agreement provided with the
-** Software or, alternatively, in accordance with the terms contained in
-** a written agreement between you and The Qt Company. For licensing terms
-** and conditions see https://www.qt.io/terms-conditions. For further
-** information use the contact form at https://www.qt.io/contact-us.
-**
-** GNU Lesser General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU Lesser
-** General Public License version 3 as published by the Free Software
-** Foundation and appearing in the file LICENSE.LGPL3 included in the
-** packaging of this file. Please review the following information to
-** ensure the GNU Lesser General Public License version 3 requirements
-** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
-**
-** GNU General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU
-** General Public License version 2.0 or (at your option) the GNU General
-** Public license version 3 or any later version approved by the KDE Free
-** Qt Foundation. The licenses are as published by the Free Software
-** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
-** included in the packaging of this file. Please review the following
-** information to ensure the GNU General Public License requirements will
-** be met: https://www.gnu.org/licenses/gpl-2.0.html and
-** https://www.gnu.org/licenses/gpl-3.0.html.
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-// see comment in ../platformdefs_win.h.
-#define WIN32_LEAN_AND_MEAN 1
-
-#include "qnetworksession_impl.h"
-#include "qbearerengine_impl.h"
-
-#include <QtNetwork/qnetworksession.h>
-#include <QtNetwork/private/qnetworkconfigmanager_p.h>
-
-#include <QtCore/qdatetime.h>
-#include <QtCore/qdebug.h>
-#include <QtCore/qmutex.h>
-#include <QtCore/qstringlist.h>
-
-QT_BEGIN_NAMESPACE
-
-static QBearerEngineImpl *getEngineFromId(const QString &id)
-{
-    QNetworkConfigurationManagerPrivate *priv = qNetworkConfigurationManagerPrivate();
-    if (priv) {
-        const auto engines = priv->engines();
-        for (QBearerEngine *engine : engines) {
-            QBearerEngineImpl *engineImpl = qobject_cast<QBearerEngineImpl *>(engine);
-            if (engineImpl && engineImpl->hasIdentifier(id))
-                return engineImpl;
-        }
-    }
-
-    return 0;
-}
-
-class QNetworkSessionManagerPrivate : public QObject
-{
-    Q_OBJECT
-
-public:
-    QNetworkSessionManagerPrivate(QObject *parent = 0) : QObject(parent) {}
-    ~QNetworkSessionManagerPrivate() {}
-
-    inline void forceSessionClose(const QNetworkConfiguration &config)
-    { emit forcedSessionClose(config); }
-
-Q_SIGNALS:
-    void forcedSessionClose(const QNetworkConfiguration &config);
-};
-
-Q_GLOBAL_STATIC(QNetworkSessionManagerPrivate, sessionManager);
-
-void QNetworkSessionPrivateImpl::syncStateWithInterface()
-{
-    connect(sessionManager(), SIGNAL(forcedSessionClose(QNetworkConfiguration)),
-            this, SLOT(forcedSessionClose(QNetworkConfiguration)));
-
-    opened = false;
-    isOpen = false;
-    state = QNetworkSession::Invalid;
-    lastError = QNetworkSession::UnknownSessionError;
-
-    qRegisterMetaType<QBearerEngineImpl::ConnectionError>();
-
-    switch (publicConfig.type()) {
-    case QNetworkConfiguration::InternetAccessPoint:
-        activeConfig = publicConfig;
-        engine = getEngineFromId(activeConfig.identifier());
-        if (engine) {
-            qRegisterMetaType<QNetworkConfigurationPrivatePointer>();
-            connect(engine, SIGNAL(configurationChanged(QNetworkConfigurationPrivatePointer)),
-                    this, SLOT(configurationChanged(QNetworkConfigurationPrivatePointer)),
-                    Qt::QueuedConnection);
-            connect(engine, SIGNAL(connectionError(QString,QBearerEngineImpl::ConnectionError)),
-                    this, SLOT(connectionError(QString,QBearerEngineImpl::ConnectionError)),
-                    Qt::QueuedConnection);
-        }
-        break;
-    case QNetworkConfiguration::ServiceNetwork:
-        serviceConfig = publicConfig;
-        // Defer setting engine and signals until open().
-        Q_FALLTHROUGH();
-    case QNetworkConfiguration::UserChoice:
-        // Defer setting serviceConfig and activeConfig until open().
-        Q_FALLTHROUGH();
-    default:
-        engine = 0;
-    }
-
-    networkConfigurationsChanged();
-}
-
-void QNetworkSessionPrivateImpl::open()
-{
-    if (serviceConfig.isValid()) {
-        lastError = QNetworkSession::OperationNotSupportedError;
-        emit QNetworkSessionPrivate::error(lastError);
-    } else if (!isOpen) {
-        if ((activeConfig.state() & QNetworkConfiguration::Discovered) != QNetworkConfiguration::Discovered) {
-            lastError = QNetworkSession::InvalidConfigurationError;
-            state = QNetworkSession::Invalid;
-            emit stateChanged(state);
-            emit QNetworkSessionPrivate::error(lastError);
-            return;
-        }
-        opened = true;
-
-        if ((activeConfig.state() & QNetworkConfiguration::Active) != QNetworkConfiguration::Active &&
-            (activeConfig.state() & QNetworkConfiguration::Discovered) == QNetworkConfiguration::Discovered) {
-            state = QNetworkSession::Connecting;
-            emit stateChanged(state);
-
-            engine->connectToId(activeConfig.identifier());
-        }
-
-        isOpen = (activeConfig.state() & QNetworkConfiguration::Active) == QNetworkConfiguration::Active;
-        if (isOpen)
-            emit quitPendingWaitsForOpened();
-    }
-}
-
-void QNetworkSessionPrivateImpl::close()
-{
-    if (serviceConfig.isValid()) {
-        lastError = QNetworkSession::OperationNotSupportedError;
-        emit QNetworkSessionPrivate::error(lastError);
-    } else if (isOpen) {
-        opened = false;
-        isOpen = false;
-        emit closed();
-    }
-}
-
-void QNetworkSessionPrivateImpl::stop()
-{
-    if (serviceConfig.isValid()) {
-        lastError = QNetworkSession::OperationNotSupportedError;
-        emit QNetworkSessionPrivate::error(lastError);
-    } else {
-        if ((activeConfig.state() & QNetworkConfiguration::Active) == QNetworkConfiguration::Active) {
-            state = QNetworkSession::Closing;
-            emit stateChanged(state);
-
-            engine->disconnectFromId(activeConfig.identifier());
-
-            sessionManager()->forceSessionClose(activeConfig);
-        }
-
-        opened = false;
-        isOpen = false;
-        emit closed();
-    }
-}
-
-void QNetworkSessionPrivateImpl::migrate()
-{
-}
-
-void QNetworkSessionPrivateImpl::accept()
-{
-}
-
-void QNetworkSessionPrivateImpl::ignore()
-{
-}
-
-void QNetworkSessionPrivateImpl::reject()
-{
-}
-
-#ifndef QT_NO_NETWORKINTERFACE
-QNetworkInterface QNetworkSessionPrivateImpl::currentInterface() const
-{
-    if (!engine || state != QNetworkSession::Connected || !publicConfig.isValid())
-        return QNetworkInterface();
-
-    QString iface = engine->getInterfaceFromId(activeConfig.identifier());
-    if (iface.isEmpty())
-        return QNetworkInterface();
-    return QNetworkInterface::interfaceFromName(iface);
-}
-#endif
-
-QVariant QNetworkSessionPrivateImpl::sessionProperty(const QString &key) const
-{
-    if (key == QLatin1String("AutoCloseSessionTimeout")) {
-        if (engine && engine->requiresPolling() &&
-            !(engine->capabilities() & QNetworkConfigurationManager::CanStartAndStopInterfaces)) {
-            return sessionTimeout >= 0 ? sessionTimeout * 10000 : -1;
-        }
-    }
-
-    return QVariant();
-}
-
-void QNetworkSessionPrivateImpl::setSessionProperty(const QString &key, const QVariant &value)
-{
-    if (key == QLatin1String("AutoCloseSessionTimeout")) {
-        if (engine && engine->requiresPolling() &&
-            !(engine->capabilities() & QNetworkConfigurationManager::CanStartAndStopInterfaces)) {
-            int timeout = value.toInt();
-            if (timeout >= 0) {
-                connect(engine, SIGNAL(updateCompleted()),
-                        this, SLOT(decrementTimeout()), Qt::UniqueConnection);
-                sessionTimeout = timeout / 10000;   // convert to poll intervals
-            } else {
-                disconnect(engine, SIGNAL(updateCompleted()), this, SLOT(decrementTimeout()));
-                sessionTimeout = -1;
-            }
-        }
-    }
-}
-
-QString QNetworkSessionPrivateImpl::errorString() const
-{
-    switch (lastError) {
-    case QNetworkSession::UnknownSessionError:
-        return tr("Unknown session error.");
-    case QNetworkSession::SessionAbortedError:
-        return tr("The session was aborted by the user or system.");
-    case QNetworkSession::OperationNotSupportedError:
-        return tr("The requested operation is not supported by the system.");
-    case QNetworkSession::InvalidConfigurationError:
-        return tr("The specified configuration cannot be used.");
-    case QNetworkSession::RoamingError:
-        return tr("Roaming was aborted or is not possible.");
-    default:
-        break;
-    }
-
-    return QString();
-}
-
-QNetworkSession::SessionError QNetworkSessionPrivateImpl::error() const
-{
-    return lastError;
-}
-
-quint64 QNetworkSessionPrivateImpl::bytesWritten() const
-{
-    if (engine && state == QNetworkSession::Connected)
-        return engine->bytesWritten(activeConfig.identifier());
-    return Q_UINT64_C(0);
-}
-
-quint64 QNetworkSessionPrivateImpl::bytesReceived() const
-{
-    if (engine && state == QNetworkSession::Connected)
-        return engine->bytesReceived(activeConfig.identifier());
-    return Q_UINT64_C(0);
-}
-
-quint64 QNetworkSessionPrivateImpl::activeTime() const
-{
-    if (state == QNetworkSession::Connected && startTime != Q_UINT64_C(0))
-        return QDateTime::currentSecsSinceEpoch() - startTime;
-    return Q_UINT64_C(0);
-}
-
-QNetworkSession::UsagePolicies QNetworkSessionPrivateImpl::usagePolicies() const
-{
-    return currentPolicies;
-}
-
-void QNetworkSessionPrivateImpl::setUsagePolicies(QNetworkSession::UsagePolicies newPolicies)
-{
-    if (newPolicies != currentPolicies) {
-        currentPolicies = newPolicies;
-        emit usagePoliciesChanged(currentPolicies);
-    }
-}
-
-void QNetworkSessionPrivateImpl::updateStateFromServiceNetwork()
-{
-    QNetworkSession::State oldState = state;
-
-    const auto configs = serviceConfig.children();
-    for (const QNetworkConfiguration &config : configs) {
-        if ((config.state() & QNetworkConfiguration::Active) != QNetworkConfiguration::Active)
-            continue;
-
-        if (activeConfig != config) {
-            if (engine) {
-                disconnect(engine, SIGNAL(connectionError(QString,QBearerEngineImpl::ConnectionError)),
-                           this, SLOT(connectionError(QString,QBearerEngineImpl::ConnectionError)));
-            }
-
-            activeConfig = config;
-            engine = getEngineFromId(activeConfig.identifier());
-
-            if (engine) {
-                connect(engine, SIGNAL(connectionError(QString,QBearerEngineImpl::ConnectionError)),
-                        this, SLOT(connectionError(QString,QBearerEngineImpl::ConnectionError)),
-                        Qt::QueuedConnection);
-            }
-            emit newConfigurationActivated();
-        }
-
-        state = QNetworkSession::Connected;
-        if (state != oldState)
-            emit stateChanged(state);
-
-        return;
-    }
-
-    if (serviceConfig.children().isEmpty())
-        state = QNetworkSession::NotAvailable;
-    else
-        state = QNetworkSession::Disconnected;
-
-    if (state != oldState)
-        emit stateChanged(state);
-}
-
-void QNetworkSessionPrivateImpl::updateStateFromActiveConfig()
-{
-    if (!engine)
-        return;
-
-    QNetworkSession::State oldState = state;
-    state = engine->sessionStateForId(activeConfig.identifier());
-
-    bool oldActive = isOpen;
-    isOpen = (state == QNetworkSession::Connected) ? opened : false;
-
-    if (!oldActive && isOpen)
-        emit quitPendingWaitsForOpened();
-    if (oldActive && !isOpen)
-        emit closed();
-
-    if (oldState != state)
-        emit stateChanged(state);
-}
-
-void QNetworkSessionPrivateImpl::networkConfigurationsChanged()
-{
-    if (serviceConfig.isValid())
-        updateStateFromServiceNetwork();
-    else
-        updateStateFromActiveConfig();
-
-    if (engine)
-        startTime = engine->startTime(activeConfig.identifier());
-}
-
-void QNetworkSessionPrivateImpl::configurationChanged(QNetworkConfigurationPrivatePointer config)
-{
-    if (serviceConfig.isValid() &&
-        (config->id == serviceConfig.identifier() || config->id == activeConfig.identifier())) {
-        updateStateFromServiceNetwork();
-    } else if (config->id == activeConfig.identifier()) {
-        updateStateFromActiveConfig();
-    }
-}
-
-void QNetworkSessionPrivateImpl::forcedSessionClose(const QNetworkConfiguration &config)
-{
-    if (activeConfig == config) {
-        opened = false;
-        isOpen = false;
-
-        emit closed();
-
-        lastError = QNetworkSession::SessionAbortedError;
-        emit QNetworkSessionPrivate::error(lastError);
-    }
-}
-
-void QNetworkSessionPrivateImpl::connectionError(const QString &id, QBearerEngineImpl::ConnectionError error)
-{
-    if (activeConfig.identifier() == id) {
-        networkConfigurationsChanged();
-        switch (error) {
-        case QBearerEngineImpl::OperationNotSupported:
-            lastError = QNetworkSession::OperationNotSupportedError;
-            opened = false;
-            break;
-        case QBearerEngineImpl::InterfaceLookupError:
-        case QBearerEngineImpl::ConnectError:
-        case QBearerEngineImpl::DisconnectionError:
-        default:
-            lastError = QNetworkSession::UnknownSessionError;
-        }
-
-        emit QNetworkSessionPrivate::error(lastError);
-    }
-}
-
-void QNetworkSessionPrivateImpl::decrementTimeout()
-{
-    if (--sessionTimeout <= 0) {
-        disconnect(engine, SIGNAL(updateCompleted()), this, SLOT(decrementTimeout()));
-        sessionTimeout = -1;
-        close();
-    }
-}
-
-QT_END_NAMESPACE
-
-#include "qnetworksession_impl.moc"
diff --git a/src/plugins/bearer/qnetworksession_impl.h b/src/plugins/bearer/qnetworksession_impl.h
deleted file mode 100644
index 0f8e014900..0000000000
--- a/src/plugins/bearer/qnetworksession_impl.h
+++ /dev/null
@@ -1,130 +0,0 @@
-/****************************************************************************
-**
-** Copyright (C) 2016 The Qt Company Ltd.
-** Contact: https://www.qt.io/licensing/
-**
-** This file is part of the plugins of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:LGPL$
-** Commercial License Usage
-** Licensees holding valid commercial Qt licenses may use this file in
-** accordance with the commercial license agreement provided with the
-** Software or, alternatively, in accordance with the terms contained in
-** a written agreement between you and The Qt Company. For licensing terms
-** and conditions see https://www.qt.io/terms-conditions. For further
-** information use the contact form at https://www.qt.io/contact-us.
-**
-** GNU Lesser General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU Lesser
-** General Public License version 3 as published by the Free Software
-** Foundation and appearing in the file LICENSE.LGPL3 included in the
-** packaging of this file. Please review the following information to
-** ensure the GNU Lesser General Public License version 3 requirements
-** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
-**
-** GNU General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU
-** General Public License version 2.0 or (at your option) the GNU General
-** Public license version 3 or any later version approved by the KDE Free
-** Qt Foundation. The licenses are as published by the Free Software
-** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
-** included in the packaging of this file. Please review the following
-** information to ensure the GNU General Public License requirements will
-** be met: https://www.gnu.org/licenses/gpl-2.0.html and
-** https://www.gnu.org/licenses/gpl-3.0.html.
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-#ifndef QNETWORKSESSION_IMPL_H
-#define QNETWORKSESSION_IMPL_H
-
-//
-//  W A R N I N G
-//  -------------
-//
-// This file is not part of the Qt API.  It exists purely as an
-// implementation detail.  This header file may change from version to
-// version without notice, or even be removed.
-//
-// We mean it.
-//
-
-#include "qbearerengine_impl.h"
-
-#include <QtNetwork/private/qnetworkconfigmanager_p.h>
-#include <QtNetwork/private/qnetworksession_p.h>
-
-QT_BEGIN_NAMESPACE
-
-class QBearerEngineImpl;
-
-class QNetworkSessionPrivateImpl : public QNetworkSessionPrivate
-{
-    Q_OBJECT
-
-public:
-    QNetworkSessionPrivateImpl()
-        : engine(nullptr), startTime(0), lastError(QNetworkSession::UnknownSessionError), sessionTimeout(-1), currentPolicies(QNetworkSession::NoPolicy), opened(false)
-    {}
-    ~QNetworkSessionPrivateImpl()
-    {}
-
-    //called by QNetworkSession constructor and ensures
-    //that the state is immediately updated (w/o actually opening
-    //a session). Also this function should take care of
-    //notification hooks to discover future state changes.
-    void syncStateWithInterface() override;
-
-#ifndef QT_NO_NETWORKINTERFACE
-    QNetworkInterface currentInterface() const override;
-#endif
-    QVariant sessionProperty(const QString& key) const override;
-    void setSessionProperty(const QString& key, const QVariant& value) override;
-
-    void open() override;
-    void close() override;
-    void stop() override;
-    void migrate() override;
-    void accept() override;
-    void ignore() override;
-    void reject() override;
-
-    QString errorString() const override; //must return translated string
-    QNetworkSession::SessionError error() const override;
-
-    quint64 bytesWritten() const override;
-    quint64 bytesReceived() const override;
-    quint64 activeTime() const override;
-
-    QNetworkSession::UsagePolicies usagePolicies() const override;
-    void setUsagePolicies(QNetworkSession::UsagePolicies) override;
-
-private Q_SLOTS:
-    void networkConfigurationsChanged();
-    void configurationChanged(QNetworkConfigurationPrivatePointer config);
-    void forcedSessionClose(const QNetworkConfiguration &config);
-    void connectionError(const QString &id, QBearerEngineImpl::ConnectionError error);
-    void decrementTimeout();
-
-private:
-    void updateStateFromServiceNetwork();
-    void updateStateFromActiveConfig();
-
-private:
-    QBearerEngineImpl *engine;
-
-    quint64 startTime;
-
-    QNetworkSession::SessionError lastError;
-
-    int sessionTimeout;
-    QNetworkSession::UsagePolicies currentPolicies;
-
-    bool opened;
-};
-
-QT_END_NAMESPACE
-
-#endif // QNETWORKSESSION_IMPL_H
diff --git a/src/plugins/platforms/android/android.pro b/src/plugins/platforms/android/android.pro
index 730247cd7f..61cac51633 100644
--- a/src/plugins/platforms/android/android.pro
+++ b/src/plugins/platforms/android/android.pro
@@ -16,7 +16,6 @@ INCLUDEPATH += \
     $$QT_SOURCE_TREE/src/3rdparty/android
 
 SOURCES += $$PWD/main.cpp \
-           $$PWD/androidplatformplugin.cpp \
            $$PWD/androidcontentfileengine.cpp \
            $$PWD/androiddeadlockprotector.cpp \
            $$PWD/androidjnimain.cpp \
diff --git a/src/plugins/platforms/android/androidplatformplugin.cpp b/src/plugins/platforms/android/androidplatformplugin.cpp
deleted file mode 100644
index 297e167f47..0000000000
--- a/src/plugins/platforms/android/androidplatformplugin.cpp
+++ /dev/null
@@ -1,64 +0,0 @@
-/****************************************************************************
-**
-** Copyright (C) 2012 BogDan Vatra <bogdan@kde.org>
-** Contact: https://www.qt.io/licensing/
-**
-** This file is part of the plugins of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:LGPL$
-** Commercial License Usage
-** Licensees holding valid commercial Qt licenses may use this file in
-** accordance with the commercial license agreement provided with the
-** Software or, alternatively, in accordance with the terms contained in
-** a written agreement between you and The Qt Company. For licensing terms
-** and conditions see https://www.qt.io/terms-conditions. For further
-** information use the contact form at https://www.qt.io/contact-us.
-**
-** GNU Lesser General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU Lesser
-** General Public License version 3 as published by the Free Software
-** Foundation and appearing in the file LICENSE.LGPL3 included in the
-** packaging of this file. Please review the following information to
-** ensure the GNU Lesser General Public License version 3 requirements
-** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
-**
-** GNU General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU
-** General Public License version 2.0 or (at your option) the GNU General
-** Public license version 3 or any later version approved by the KDE Free
-** Qt Foundation. The licenses are as published by the Free Software
-** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
-** included in the packaging of this file. Please review the following
-** information to ensure the GNU General Public License requirements will
-** be met: https://www.gnu.org/licenses/gpl-2.0.html and
-** https://www.gnu.org/licenses/gpl-3.0.html.
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-#include <qpa/qplatformintegrationplugin.h>
-#include "qandroidplatformintegration.h"
-
-QT_BEGIN_NAMESPACE
-
-class QAndroidPlatformIntegrationPlugin: public QPlatformIntegrationPlugin
-{
-    Q_OBJECT
-    Q_PLUGIN_METADATA(IID QPlatformIntegrationFactoryInterface_iid FILE "android.json")
-public:
-    QPlatformIntegration *create(const QString &key, const QStringList &paramList) override;
-};
-
-
-QPlatformIntegration *QAndroidPlatformIntegrationPlugin::create(const QString &key, const QStringList &paramList)
-{
-    Q_UNUSED(paramList);
-    if (!key.compare(QLatin1String("android"), Qt::CaseInsensitive))
-        return new QAndroidPlatformIntegration(paramList);
-    return 0;
-}
-
-QT_END_NAMESPACE
-#include "androidplatformplugin.moc"
-
diff --git a/src/plugins/platforms/android/main.cpp b/src/plugins/platforms/android/main.cpp
index c304fc8d69..4841d0425c 100644
--- a/src/plugins/platforms/android/main.cpp
+++ b/src/plugins/platforms/android/main.cpp
@@ -61,3 +61,4 @@ QPlatformIntegration *QAndroidIntegrationPlugin::create(const QString& system, c
 }
 
 QT_END_NAMESPACE
+#include "main.moc"
diff --git a/src/plugins/platforms/cocoa/qcocoaaccessibility.h b/src/plugins/platforms/cocoa/qcocoaaccessibility.h
index 457c158ddc..539d876094 100644
--- a/src/plugins/platforms/cocoa/qcocoaaccessibility.h
+++ b/src/plugins/platforms/cocoa/qcocoaaccessibility.h
@@ -44,9 +44,9 @@
 #include <QtGui>
 #include <qpa/qplatformaccessibility.h>
 
-#ifndef QT_NO_ACCESSIBILITY
+#include "qcocoaaccessibilityelement.h"
 
-@class QT_MANGLE_NAMESPACE(QMacAccessibilityElement);
+#ifndef QT_NO_ACCESSIBILITY
 
 QT_BEGIN_NAMESPACE
 
@@ -84,7 +84,7 @@ namespace QCocoaAccessible {
 NSString *macRole(QAccessibleInterface *interface);
 NSString *macSubrole(QAccessibleInterface *interface);
 bool shouldBeIgnored(QAccessibleInterface *interface);
-NSArray<QT_MANGLE_NAMESPACE(QMacAccessibilityElement) *> *unignoredChildren(QAccessibleInterface *interface);
+NSArray<QMacAccessibilityElement *> *unignoredChildren(QAccessibleInterface *interface);
 NSString *getTranslatedAction(const QString &qtAction);
 QString translateAction(NSString *nsAction, QAccessibleInterface *interface);
 bool hasValueAttribute(QAccessibleInterface *interface);
diff --git a/src/plugins/platforms/cocoa/qcocoaaccessibilityelement.h b/src/plugins/platforms/cocoa/qcocoaaccessibilityelement.h
index 7fbe729381..141ce6bf1a 100644
--- a/src/plugins/platforms/cocoa/qcocoaaccessibilityelement.h
+++ b/src/plugins/platforms/cocoa/qcocoaaccessibilityelement.h
@@ -50,8 +50,6 @@
 
 #import <qaccessible.h>
 
-@class QT_MANGLE_NAMESPACE(QMacAccessibilityElement);
-
 @interface QT_MANGLE_NAMESPACE(QMacAccessibilityElement) : NSObject <NSAccessibilityElement>
 
 - (instancetype)initWithId:(QAccessible::Id)anId;
diff --git a/src/plugins/platforms/cocoa/qcocoaapplication.mm b/src/plugins/platforms/cocoa/qcocoaapplication.mm
index 340191622a..c6029bcf03 100644
--- a/src/plugins/platforms/cocoa/qcocoaapplication.mm
+++ b/src/plugins/platforms/cocoa/qcocoaapplication.mm
@@ -144,7 +144,7 @@ static void qt_maybeSendKeyEquivalentUpEvent(NSEvent *event)
     }
 }
 
-@implementation QT_MANGLE_NAMESPACE(QNSApplication)
+@implementation QNSApplication
 
 - (void)QT_MANGLE_NAMESPACE(qt_sendEvent_original):(NSEvent *)event
 {
@@ -188,7 +188,7 @@ void qt_redirectNSApplicationSendEvent()
         // can be unloaded.
         return;
 
-    if ([NSApp isMemberOfClass:[QT_MANGLE_NAMESPACE(QNSApplication) class]]) {
+    if ([NSApp isMemberOfClass:[QNSApplication class]]) {
         // No need to change implementation since Qt
         // already controls a subclass of NSApplication
         return;
@@ -201,7 +201,7 @@ void qt_redirectNSApplicationSendEvent()
     qt_cocoa_change_implementation(
             [NSApplication class],
             @selector(sendEvent:),
-            [QT_MANGLE_NAMESPACE(QNSApplication) class],
+            [QNSApplication class],
             @selector(QT_MANGLE_NAMESPACE(qt_sendEvent_replacement):),
             @selector(QT_MANGLE_NAMESPACE(qt_sendEvent_original):));
  }
diff --git a/src/plugins/platforms/cocoa/qcocoaapplicationdelegate.h b/src/plugins/platforms/cocoa/qcocoaapplicationdelegate.h
index 0816730c54..8ec9d6fbe0 100644
--- a/src/plugins/platforms/cocoa/qcocoaapplicationdelegate.h
+++ b/src/plugins/platforms/cocoa/qcocoaapplicationdelegate.h
@@ -89,8 +89,7 @@
 
 #include <qglobal.h>
 #include <private/qcore_mac_p.h>
-
-Q_FORWARD_DECLARE_OBJC_CLASS(QT_MANGLE_NAMESPACE(QCocoaNSMenuItem));
+#include "qcocoansmenu.h"
 
 @interface QT_MANGLE_NAMESPACE(QCocoaApplicationDelegate) : NSObject <NSApplicationDelegate>
 @property (nonatomic, retain) NSMenu *dockMenu;
@@ -100,8 +99,9 @@ Q_FORWARD_DECLARE_OBJC_CLASS(QT_MANGLE_NAMESPACE(QCocoaNSMenuItem));
 - (bool)inLaunch;
 @end
 
-@interface QT_MANGLE_NAMESPACE(QCocoaApplicationDelegate) (MenuAPI)
-- (void)qt_itemFired:(QT_MANGLE_NAMESPACE(QCocoaNSMenuItem) *)item;
+QT_NAMESPACE_ALIAS_OBJC_CLASS(QCocoaApplicationDelegate);
+
+@interface QCocoaApplicationDelegate (MenuAPI)
+- (void)qt_itemFired:(QCocoaNSMenuItem *)item;
 @end
 
-QT_NAMESPACE_ALIAS_OBJC_CLASS(QCocoaApplicationDelegate);
diff --git a/src/plugins/platforms/cocoa/qcocoaapplicationdelegate.mm b/src/plugins/platforms/cocoa/qcocoaapplicationdelegate.mm
index 2df85c791b..00f5a1bf09 100644
--- a/src/plugins/platforms/cocoa/qcocoaapplicationdelegate.mm
+++ b/src/plugins/platforms/cocoa/qcocoaapplicationdelegate.mm
@@ -145,7 +145,7 @@ QT_USE_NAMESPACE
     [[NSApp mainMenu] cancelTracking];
 
     bool handle_quit = true;
-    NSMenuItem *quitMenuItem = [[QT_MANGLE_NAMESPACE(QCocoaMenuLoader) sharedMenuLoader] quitMenuItem];
+    NSMenuItem *quitMenuItem = [[QCocoaMenuLoader sharedMenuLoader] quitMenuItem];
     if (!QGuiApplicationPrivate::instance()->modalWindowList.isEmpty()
         && [quitMenuItem isEnabled]) {
         int visible = 0;
diff --git a/src/plugins/platforms/cocoa/qcocoacolordialoghelper.mm b/src/plugins/platforms/cocoa/qcocoacolordialoghelper.mm
index d7850b1481..c9fa035d87 100644
--- a/src/plugins/platforms/cocoa/qcocoacolordialoghelper.mm
+++ b/src/plugins/platforms/cocoa/qcocoacolordialoghelper.mm
@@ -293,7 +293,7 @@ class QCocoaColorPanel
 public:
     QCocoaColorPanel()
     {
-        mDelegate = [[QT_MANGLE_NAMESPACE(QNSColorPanelDelegate) alloc] init];
+        mDelegate = [[QNSColorPanelDelegate alloc] init];
     }
 
     ~QCocoaColorPanel()
@@ -366,7 +366,7 @@ public:
     }
 
 private:
-    QT_MANGLE_NAMESPACE(QNSColorPanelDelegate) *mDelegate;
+    QNSColorPanelDelegate *mDelegate;
 };
 
 Q_GLOBAL_STATIC(QCocoaColorPanel, sharedColorPanel)
diff --git a/src/plugins/platforms/cocoa/qcocoafiledialoghelper.h b/src/plugins/platforms/cocoa/qcocoafiledialoghelper.h
index 2ddda14289..dd0afbefe6 100644
--- a/src/plugins/platforms/cocoa/qcocoafiledialoghelper.h
+++ b/src/plugins/platforms/cocoa/qcocoafiledialoghelper.h
@@ -43,10 +43,16 @@
 #include <QObject>
 #include <QtWidgets/qtwidgetsglobal.h>
 #include <qpa/qplatformdialoghelper.h>
+#include <QtCore/private/qcore_mac_p.h>
+
+#import <AppKit/NSSavePanel.h>
 
 QT_REQUIRE_CONFIG(filedialog);
 
-Q_FORWARD_DECLARE_OBJC_CLASS(QT_MANGLE_NAMESPACE(QNSOpenSavePanelDelegate));
+@interface QT_MANGLE_NAMESPACE(QNSOpenSavePanelDelegate) : NSObject<NSOpenSavePanelDelegate>
+@end
+
+QT_NAMESPACE_ALIAS_OBJC_CLASS(QNSOpenSavePanelDelegate);
 
 QT_BEGIN_NAMESPACE
 
@@ -84,7 +90,7 @@ public:
     void QNSOpenSavePanelDelegate_filterSelected(int menuIndex);
 
 private:
-    QT_MANGLE_NAMESPACE(QNSOpenSavePanelDelegate) *mDelegate;
+    QNSOpenSavePanelDelegate *mDelegate;
     QUrl mDir;
 };
 
diff --git a/src/plugins/platforms/cocoa/qcocoafiledialoghelper.mm b/src/plugins/platforms/cocoa/qcocoafiledialoghelper.mm
index 03677ef0bc..6aa21d78d1 100644
--- a/src/plugins/platforms/cocoa/qcocoafiledialoghelper.mm
+++ b/src/plugins/platforms/cocoa/qcocoafiledialoghelper.mm
@@ -76,27 +76,6 @@ QT_USE_NAMESPACE
 
 typedef QSharedPointer<QFileDialogOptions> SharedPointerFileDialogOptions;
 
-@interface QT_MANGLE_NAMESPACE(QNSOpenSavePanelDelegate)
-    : NSObject<NSOpenSavePanelDelegate>
-
-- (NSString *)strip:(const QString &)label;
-- (BOOL)panel:(id)sender shouldEnableURL:(NSURL *)url;
-- (void)filterChanged:(id)sender;
-- (void)showModelessPanel;
-- (BOOL)runApplicationModalPanel;
-- (void)showWindowModalSheet:(QWindow *)docWidget;
-- (void)updateProperties;
-- (QStringList)acceptableExtensionsForSave;
-- (QString)removeExtensions:(const QString &)filter;
-- (void)createTextField;
-- (void)createPopUpButton:(const QString &)selectedFilter hideDetails:(BOOL)hideDetails;
-- (QStringList)findStrippedFilterWithVisualFilterName:(QString)name;
-- (void)createAccessory;
-
-@end
-
-QT_NAMESPACE_ALIAS_OBJC_CLASS(QNSOpenSavePanelDelegate);
-
 @implementation QNSOpenSavePanelDelegate {
     @public
     NSOpenPanel *mOpenPanel;
diff --git a/src/plugins/platforms/cocoa/qcocoafontdialoghelper.mm b/src/plugins/platforms/cocoa/qcocoafontdialoghelper.mm
index 8c0af97a68..7748c304e3 100644
--- a/src/plugins/platforms/cocoa/qcocoafontdialoghelper.mm
+++ b/src/plugins/platforms/cocoa/qcocoafontdialoghelper.mm
@@ -283,7 +283,7 @@ class QCocoaFontPanel
 public:
     QCocoaFontPanel()
     {
-        mDelegate = [[QT_MANGLE_NAMESPACE(QNSFontPanelDelegate) alloc] init];
+        mDelegate = [[QNSFontPanelDelegate alloc] init];
     }
 
     ~QCocoaFontPanel()
@@ -356,7 +356,7 @@ public:
     }
 
 private:
-    QT_MANGLE_NAMESPACE(QNSFontPanelDelegate) *mDelegate;
+    QNSFontPanelDelegate *mDelegate;
 };
 
 Q_GLOBAL_STATIC(QCocoaFontPanel, sharedFontPanel)
diff --git a/src/plugins/platforms/cocoa/qcocoamenu.h b/src/plugins/platforms/cocoa/qcocoamenu.h
index a957710a88..1dccf0621c 100644
--- a/src/plugins/platforms/cocoa/qcocoamenu.h
+++ b/src/plugins/platforms/cocoa/qcocoamenu.h
@@ -44,8 +44,7 @@
 #include <QtCore/QList>
 #include <qpa/qplatformmenu.h>
 #include "qcocoamenuitem.h"
-
-Q_FORWARD_DECLARE_OBJC_CLASS(QT_MANGLE_NAMESPACE(QCocoaNSMenu));
+#include "qcocoansmenu.h"
 
 QT_BEGIN_NAMESPACE
 
@@ -107,7 +106,7 @@ private:
     void scheduleUpdate();
 
     QList<QCocoaMenuItem *> m_menuItems;
-    QT_MANGLE_NAMESPACE(QCocoaNSMenu) *m_nativeMenu;
+    QCocoaNSMenu *m_nativeMenu;
     NSMenuItem *m_attachedItem;
     int m_updateTimer;
     bool m_enabled:1;
diff --git a/src/plugins/platforms/cocoa/qcocoamenubar.mm b/src/plugins/platforms/cocoa/qcocoamenubar.mm
index 30bff78a36..363defdd28 100644
--- a/src/plugins/platforms/cocoa/qcocoamenubar.mm
+++ b/src/plugins/platforms/cocoa/qcocoamenubar.mm
@@ -278,12 +278,11 @@ void QCocoaMenuBar::updateMenuBarImmediately()
         // we still have to update the menubar.
         if ((win->flags() & Qt::WindowType_Mask) != Qt::Tool)
             return;
-        typedef QT_MANGLE_NAMESPACE(QCocoaApplicationDelegate) AppDelegate;
         NSApplication *app = [NSApplication sharedApplication];
-        if (![app.delegate isKindOfClass:[AppDelegate class]])
+        if (![app.delegate isKindOfClass:[QCocoaApplicationDelegate class]])
             return;
         // We apply this logic _only_ during the startup.
-        AppDelegate *appDelegate = app.delegate;
+        QCocoaApplicationDelegate *appDelegate = app.delegate;
         if (!appDelegate.inLaunch)
             return;
     }
@@ -403,3 +402,4 @@ QCocoaWindow *QCocoaMenuBar::cocoaWindow() const
 
 QT_END_NAMESPACE
 
+#include "moc_qcocoamenubar.cpp"
diff --git a/src/plugins/platforms/cocoa/qcocoansmenu.h b/src/plugins/platforms/cocoa/qcocoansmenu.h
index 6cbb6e4a01..0c77e2f1aa 100644
--- a/src/plugins/platforms/cocoa/qcocoansmenu.h
+++ b/src/plugins/platforms/cocoa/qcocoansmenu.h
@@ -59,31 +59,20 @@ QT_FORWARD_DECLARE_CLASS(QCocoaMenu);
 QT_FORWARD_DECLARE_CLASS(QCocoaMenuItem);
 
 @interface QT_MANGLE_NAMESPACE(QCocoaNSMenuDelegate) : NSObject <NSMenuDelegate>
-
 + (instancetype)sharedMenuDelegate;
-
-- (NSMenuItem *)findItemInMenu:(NSMenu *)menu
-                        forKey:(NSString *)key
-                     modifiers:(NSUInteger)modifiers;
-
+- (NSMenuItem *)findItemInMenu:(NSMenu *)menu forKey:(NSString *)key modifiers:(NSUInteger)modifiers;
 @end
 
 @interface QT_MANGLE_NAMESPACE(QCocoaNSMenu) : NSMenu
-
 @property (readonly, nonatomic) QCocoaMenu *platformMenu;
-
 - (instancetype)initWithPlatformMenu:(QCocoaMenu *)menu;
-
 @end
 
 @interface QT_MANGLE_NAMESPACE(QCocoaNSMenuItem) : NSMenuItem
-
 @property (nonatomic) QCocoaMenuItem *platformMenuItem;
-
 + (instancetype)separatorItemWithPlatformMenuItem:(QCocoaMenuItem *)menuItem;
 - (instancetype)initWithPlatformMenuItem:(QCocoaMenuItem *)menuItem;
 - (instancetype)init;
-
 @end
 
 QT_NAMESPACE_ALIAS_OBJC_CLASS(QCocoaNSMenu);
diff --git a/src/plugins/platforms/cocoa/qcocoasystemtrayicon.mm b/src/plugins/platforms/cocoa/qcocoasystemtrayicon.mm
index 1390ace632..559188aa5f 100644
--- a/src/plugins/platforms/cocoa/qcocoasystemtrayicon.mm
+++ b/src/plugins/platforms/cocoa/qcocoasystemtrayicon.mm
@@ -80,6 +80,8 @@
 #include <qimagewriter.h>
 #include <qdebug.h>
 
+#include <QtCore/private/qcore_mac_p.h>
+
 #include "qcocoamenu.h"
 
 #include "qt_mac_p.h"
@@ -92,8 +94,6 @@
 
 QT_USE_NAMESPACE
 
-@class QT_MANGLE_NAMESPACE(QNSImageView);
-
 @interface QT_MANGLE_NAMESPACE(QNSStatusItem) : NSObject <NSUserNotificationCenterDelegate>
 @property (nonatomic, assign) QCocoaMenu *menu;
 @property (nonatomic, assign) QIcon icon;
@@ -104,12 +104,13 @@ QT_USE_NAMESPACE
 - (void)doubleClickSelector:(id)sender;
 @end
 
+QT_NAMESPACE_ALIAS_OBJC_CLASS(QNSStatusItem);
+
 @interface QT_MANGLE_NAMESPACE(QNSImageView) : NSImageView
 @property (nonatomic, assign) BOOL down;
-@property (nonatomic, assign) QT_MANGLE_NAMESPACE(QNSStatusItem) *parent;
+@property (nonatomic, assign) QNSStatusItem *parent;
 @end
 
-QT_NAMESPACE_ALIAS_OBJC_CLASS(QNSStatusItem);
 QT_NAMESPACE_ALIAS_OBJC_CLASS(QNSImageView);
 
 QT_BEGIN_NAMESPACE
@@ -364,7 +365,7 @@ QT_END_NAMESPACE
 @implementation QNSStatusItem {
     QCocoaSystemTrayIcon *systray;
     NSStatusItem *item;
-    QT_MANGLE_NAMESPACE(QNSImageView) *imageCell;
+    QNSImageView *imageCell;
 }
 
 @synthesize menu = menu;
diff --git a/src/plugins/platforms/cocoa/qcocoatheme.h b/src/plugins/platforms/cocoa/qcocoatheme.h
index 788b616e78..a00cbdfea3 100644
--- a/src/plugins/platforms/cocoa/qcocoatheme.h
+++ b/src/plugins/platforms/cocoa/qcocoatheme.h
@@ -43,8 +43,6 @@
 #include <QtCore/QHash>
 #include <qpa/qplatformtheme.h>
 
-Q_FORWARD_DECLARE_OBJC_CLASS(QT_MANGLE_NAMESPACE(QCocoaThemeAppAppearanceObserver));
-
 #include <QtCore/private/qcore_mac_p.h>
 
 QT_BEGIN_NAMESPACE
diff --git a/src/plugins/platforms/cocoa/qnsview.h b/src/plugins/platforms/cocoa/qnsview.h
index b40dfe0d14..74d0735b4c 100644
--- a/src/plugins/platforms/cocoa/qnsview.h
+++ b/src/plugins/platforms/cocoa/qnsview.h
@@ -51,37 +51,30 @@ class QCocoaGLContext;
 class QPointF;
 QT_END_NAMESPACE
 
-Q_FORWARD_DECLARE_OBJC_CLASS(QT_MANGLE_NAMESPACE(QNSViewMouseMoveHelper));
-Q_FORWARD_DECLARE_OBJC_CLASS(QT_MANGLE_NAMESPACE(QCocoaNSMenuItem));
-
 @interface QT_MANGLE_NAMESPACE(QNSView) : NSView
-
 @property (nonatomic, retain) NSCursor *cursor;
-
 - (instancetype)initWithCocoaWindow:(QCocoaWindow *)platformWindow;
-
 - (void)convertFromScreen:(NSPoint)mouseLocation toWindowPoint:(QPointF *)qtWindowPoint andScreenPoint:(QPointF *)qtScreenPoint;
-
 @end
 
-@interface QT_MANGLE_NAMESPACE(QNSView) (MouseAPI)
+QT_NAMESPACE_ALIAS_OBJC_CLASS(QNSView);
+
+@interface QNSView (MouseAPI)
 - (void)handleFrameStrutMouseEvent:(NSEvent *)theEvent;
 - (void)resetMouseButtons;
 @end
 
-@interface QT_MANGLE_NAMESPACE(QNSView) (KeysAPI)
+@interface QNSView (KeysAPI)
 + (Qt::KeyboardModifiers)convertKeyModifiers:(ulong)modifierFlags;
 @end
 
-@interface QT_MANGLE_NAMESPACE(QNSView) (ComplexTextAPI)
+@interface QNSView (ComplexTextAPI)
 - (void)unmarkText;
 - (void)cancelComposingText;
 @end
 
-@interface QT_MANGLE_NAMESPACE(QNSView) (QtExtras)
+@interface QNSView (QtExtras)
 @property (nonatomic, readonly) QCocoaWindow *platformWindow;
 @end
 
-QT_NAMESPACE_ALIAS_OBJC_CLASS(QNSView);
-
 #endif //QNSVIEW_H
diff --git a/src/plugins/platforms/cocoa/qnsview.mm b/src/plugins/platforms/cocoa/qnsview.mm
index 5309449dce..a6e5ca5f7b 100644
--- a/src/plugins/platforms/cocoa/qnsview.mm
+++ b/src/plugins/platforms/cocoa/qnsview.mm
@@ -66,13 +66,13 @@
 #include "qcocoaintegration.h"
 
 // Private interface
-@interface QT_MANGLE_NAMESPACE(QNSView) ()
+@interface QNSView ()
 - (BOOL)isTransparentForUserInput;
 @property (assign) NSView* previousSuperview;
 @property (assign) NSWindow* previousWindow;
 @end
 
-@interface QT_MANGLE_NAMESPACE(QNSView) (Drawing) <CALayerDelegate>
+@interface QNSView (Drawing) <CALayerDelegate>
 - (void)initDrawing;
 @end
 
@@ -84,7 +84,9 @@
 - (void)cursorUpdate:(NSEvent *)theEvent;
 @end
 
-@interface QT_MANGLE_NAMESPACE(QNSView) (Mouse)
+QT_NAMESPACE_ALIAS_OBJC_CLASS(QNSViewMouseMoveHelper);
+
+@interface QNSView (Mouse)
 - (void)initMouse;
 - (NSPoint)screenMousePoint:(NSEvent *)theEvent;
 - (void)mouseMovedImpl:(NSEvent *)theEvent;
@@ -92,28 +94,28 @@
 - (void)mouseExitedImpl:(NSEvent *)theEvent;
 @end
 
-@interface QT_MANGLE_NAMESPACE(QNSView) (Touch)
+@interface QNSView (Touch)
 @end
 
-@interface QT_MANGLE_NAMESPACE(QNSView) (Tablet)
+@interface QNSView (Tablet)
 - (bool)handleTabletEvent:(NSEvent *)theEvent;
 @end
 
-@interface QT_MANGLE_NAMESPACE(QNSView) (Gestures)
+@interface QNSView (Gestures)
 @end
 
-@interface QT_MANGLE_NAMESPACE(QNSView) (Dragging)
+@interface QNSView (Dragging)
 -(void)registerDragTypes;
 @end
 
-@interface QT_MANGLE_NAMESPACE(QNSView) (Keys)
+@interface QNSView (Keys)
 @end
 
-@interface QT_MANGLE_NAMESPACE(QNSView) (ComplexText) <NSTextInputClient>
+@interface QNSView (ComplexText) <NSTextInputClient>
 - (void)textInputContextKeyboardSelectionDidChangeNotification:(NSNotification *)textInputContextKeyboardSelectionDidChangeNotification;
 @end
 
-@implementation QT_MANGLE_NAMESPACE(QNSView) {
+@implementation QNSView {
     QPointer<QCocoaWindow> m_platformWindow;
     Qt::MouseButtons m_buttons;
     Qt::MouseButtons m_acceptedMouseDowns;
@@ -125,7 +127,7 @@
     bool m_sendUpAsRightButton;
     Qt::KeyboardModifiers m_currentWheelModifiers;
     NSString *m_inputSource;
-    QT_MANGLE_NAMESPACE(QNSViewMouseMoveHelper) *m_mouseMoveHelper;
+    QNSViewMouseMoveHelper *m_mouseMoveHelper;
     bool m_resendKeyEvent;
     bool m_scrolling;
     bool m_updatingDrag;
@@ -379,7 +381,7 @@
 
 // -----------------------------------------------------
 
-@implementation QT_MANGLE_NAMESPACE(QNSView) (QtExtras)
+@implementation QNSView (QtExtras)
 
 - (QCocoaWindow*)platformWindow
 {
diff --git a/src/plugins/platforms/cocoa/qnsview_accessibility.mm b/src/plugins/platforms/cocoa/qnsview_accessibility.mm
index 32ec0b74d4..7041e14da7 100644
--- a/src/plugins/platforms/cocoa/qnsview_accessibility.mm
+++ b/src/plugins/platforms/cocoa/qnsview_accessibility.mm
@@ -47,7 +47,7 @@
 
 #import <AppKit/NSAccessibility.h>
 
-@implementation QT_MANGLE_NAMESPACE(QNSView) (Accessibility)
+@implementation QNSView (Accessibility)
 
 - (id)childAccessibleElement
 {
diff --git a/src/plugins/platforms/cocoa/qnsview_complextext.mm b/src/plugins/platforms/cocoa/qnsview_complextext.mm
index 6ff9b26ca4..5926840cf3 100644
--- a/src/plugins/platforms/cocoa/qnsview_complextext.mm
+++ b/src/plugins/platforms/cocoa/qnsview_complextext.mm
@@ -39,7 +39,7 @@
 
 // This file is included from qnsview.mm, and only used to organize the code
 
-@implementation QT_MANGLE_NAMESPACE(QNSView) (ComplexTextAPI)
+@implementation QNSView (ComplexTextAPI)
 
 - (void)cancelComposingText
 {
@@ -80,7 +80,7 @@
 
 @end
 
-@implementation QT_MANGLE_NAMESPACE(QNSView) (ComplexText)
+@implementation QNSView (ComplexText)
 
 - (void)insertNewline:(id)sender
 {
diff --git a/src/plugins/platforms/cocoa/qnsview_dragging.mm b/src/plugins/platforms/cocoa/qnsview_dragging.mm
index 41b96b2df6..650612e7ff 100644
--- a/src/plugins/platforms/cocoa/qnsview_dragging.mm
+++ b/src/plugins/platforms/cocoa/qnsview_dragging.mm
@@ -39,7 +39,7 @@
 
 // This file is included from qnsview.mm, and only used to organize the code
 
-@implementation QT_MANGLE_NAMESPACE(QNSView) (Dragging)
+@implementation QNSView (Dragging)
 
 -(void)registerDragTypes
 {
diff --git a/src/plugins/platforms/cocoa/qnsview_drawing.mm b/src/plugins/platforms/cocoa/qnsview_drawing.mm
index ce5488ead0..eb9286519d 100644
--- a/src/plugins/platforms/cocoa/qnsview_drawing.mm
+++ b/src/plugins/platforms/cocoa/qnsview_drawing.mm
@@ -39,7 +39,7 @@
 
 // This file is included from qnsview.mm, and only used to organize the code
 
-@implementation QT_MANGLE_NAMESPACE(QNSView) (Drawing)
+@implementation QNSView (Drawing)
 
 - (void)initDrawing
 {
diff --git a/src/plugins/platforms/cocoa/qnsview_gestures.mm b/src/plugins/platforms/cocoa/qnsview_gestures.mm
index f6cd3af4da..a80261fd6a 100644
--- a/src/plugins/platforms/cocoa/qnsview_gestures.mm
+++ b/src/plugins/platforms/cocoa/qnsview_gestures.mm
@@ -43,7 +43,7 @@
 
 Q_LOGGING_CATEGORY(lcQpaGestures, "qt.qpa.input.gestures")
 
-@implementation QT_MANGLE_NAMESPACE(QNSView) (Gestures)
+@implementation QNSView (Gestures)
 
 - (bool)handleGestureAsBeginEnd:(NSEvent *)event
 {
diff --git a/src/plugins/platforms/cocoa/qnsview_keys.mm b/src/plugins/platforms/cocoa/qnsview_keys.mm
index ad751279bb..847adca207 100644
--- a/src/plugins/platforms/cocoa/qnsview_keys.mm
+++ b/src/plugins/platforms/cocoa/qnsview_keys.mm
@@ -39,7 +39,7 @@
 
 // This file is included from qnsview.mm, and only used to organize the code
 
-@implementation QT_MANGLE_NAMESPACE(QNSView) (KeysAPI)
+@implementation QNSView (KeysAPI)
 
 + (Qt::KeyboardModifiers)convertKeyModifiers:(ulong)modifierFlags
 {
@@ -60,7 +60,7 @@
 
 @end
 
-@implementation QT_MANGLE_NAMESPACE(QNSView) (Keys)
+@implementation QNSView (Keys)
 
 - (int)convertKeyCode:(QChar)keyChar
 {
diff --git a/src/plugins/platforms/cocoa/qnsview_menus.mm b/src/plugins/platforms/cocoa/qnsview_menus.mm
index f0489552aa..a55fd97eb7 100644
--- a/src/plugins/platforms/cocoa/qnsview_menus.mm
+++ b/src/plugins/platforms/cocoa/qnsview_menus.mm
@@ -53,11 +53,11 @@ static bool selectorIsCutCopyPaste(SEL selector)
             || selector == @selector(selectAll:));
 }
 
-@interface QT_MANGLE_NAMESPACE(QNSView) (Menus)
+@interface QNSView (Menus)
 - (void)qt_itemFired:(QCocoaNSMenuItem *)item;
 @end
 
-@implementation QT_MANGLE_NAMESPACE(QNSView) (Menus)
+@implementation QNSView (Menus)
 
 - (BOOL)validateMenuItem:(NSMenuItem*)item
 {
diff --git a/src/plugins/platforms/cocoa/qnsview_mouse.mm b/src/plugins/platforms/cocoa/qnsview_mouse.mm
index 30613eca32..9e2761f850 100644
--- a/src/plugins/platforms/cocoa/qnsview_mouse.mm
+++ b/src/plugins/platforms/cocoa/qnsview_mouse.mm
@@ -55,7 +55,7 @@
     interact with the responder chain by e.g. calling super if Qt does not
     accept the mouse event
 */
-@implementation QT_MANGLE_NAMESPACE(QNSViewMouseMoveHelper) {
+@implementation QNSViewMouseMoveHelper {
     QNSView *view;
 }
 
@@ -89,7 +89,7 @@
 
 @end
 
-@implementation QT_MANGLE_NAMESPACE(QNSView) (MouseAPI)
+@implementation QNSView (MouseAPI)
 
 - (void)resetMouseButtons
 {
@@ -178,7 +178,7 @@
 }
 @end
 
-@implementation QT_MANGLE_NAMESPACE(QNSView) (Mouse)
+@implementation QNSView (Mouse)
 
 - (void)initMouse
 {
@@ -193,7 +193,7 @@
     m_dontOverrideCtrlLMB = qt_mac_resolveOption(false, m_platformWindow->window(),
             "_q_platform_MacDontOverrideCtrlLMB", "QT_MAC_DONT_OVERRIDE_CTRL_LMB");
 
-    m_mouseMoveHelper = [[QT_MANGLE_NAMESPACE(QNSViewMouseMoveHelper) alloc] initWithView:self];
+    m_mouseMoveHelper = [[QNSViewMouseMoveHelper alloc] initWithView:self];
 
     NSUInteger trackingOptions = NSTrackingActiveInActiveApp
         | NSTrackingMouseEnteredAndExited | NSTrackingCursorUpdate;
diff --git a/src/plugins/platforms/cocoa/qnsview_tablet.mm b/src/plugins/platforms/cocoa/qnsview_tablet.mm
index 43b0aa0960..ba1fa55892 100644
--- a/src/plugins/platforms/cocoa/qnsview_tablet.mm
+++ b/src/plugins/platforms/cocoa/qnsview_tablet.mm
@@ -54,7 +54,7 @@ struct QCocoaTabletDeviceData
 typedef QHash<uint, QCocoaTabletDeviceData> QCocoaTabletDeviceDataHash;
 Q_GLOBAL_STATIC(QCocoaTabletDeviceDataHash, tabletDeviceDataHash)
 
-@implementation QT_MANGLE_NAMESPACE(QNSView) (Tablet)
+@implementation QNSView (Tablet)
 
 - (bool)handleTabletEvent:(NSEvent *)theEvent
 {
diff --git a/src/plugins/platforms/cocoa/qnsview_touch.mm b/src/plugins/platforms/cocoa/qnsview_touch.mm
index 9330844aec..8dfae27c63 100644
--- a/src/plugins/platforms/cocoa/qnsview_touch.mm
+++ b/src/plugins/platforms/cocoa/qnsview_touch.mm
@@ -41,7 +41,7 @@
 
 Q_LOGGING_CATEGORY(lcQpaTouch, "qt.qpa.input.touch")
 
-@implementation QT_MANGLE_NAMESPACE(QNSView) (Touch)
+@implementation QNSView (Touch)
 
 - (bool)shouldSendSingleTouch
 {
diff --git a/src/plugins/platforms/cocoa/qprintengine_mac_p.h b/src/plugins/platforms/cocoa/qprintengine_mac_p.h
index 3d94227ae4..6a1ed2e263 100644
--- a/src/plugins/platforms/cocoa/qprintengine_mac_p.h
+++ b/src/plugins/platforms/cocoa/qprintengine_mac_p.h
@@ -64,11 +64,7 @@
 
 #include "qpaintengine_mac_p.h"
 
-#ifdef __OBJC__
-@class NSPrintInfo;
-#else
-typedef void NSPrintInfo;
-#endif
+Q_FORWARD_DECLARE_OBJC_CLASS(NSPrintInfo);
 
 QT_BEGIN_NAMESPACE
 
diff --git a/src/plugins/platforms/windows/qwindowscontext.cpp b/src/plugins/platforms/windows/qwindowscontext.cpp
index f5b0dced93..9757fa5f3f 100644
--- a/src/plugins/platforms/windows/qwindowscontext.cpp
+++ b/src/plugins/platforms/windows/qwindowscontext.cpp
@@ -79,6 +79,7 @@
 #include <QtCore/qscopedpointer.h>
 #include <QtCore/quuid.h>
 #include <QtCore/private/qsystemlibrary_p.h>
+#include <QtCore/private/qwinregistry_p.h>
 
 #include <QtEventDispatcherSupport/private/qwindowsguieventdispatcher_p.h>
 
@@ -1518,28 +1519,13 @@ QTouchDevice *QWindowsContext::touchDevice() const
         d->m_pointerHandler.touchDevice() : d->m_mouseHandler.touchDevice();
 }
 
-static DWORD readDwordRegistrySetting(const wchar_t *regKey, const wchar_t *subKey, DWORD defaultValue)
-{
-    DWORD result = defaultValue;
-    HKEY handle;
-    if (RegOpenKeyEx(HKEY_CURRENT_USER, regKey, 0, KEY_READ, &handle) == ERROR_SUCCESS) {
-        DWORD type;
-        if (RegQueryValueEx(handle, subKey, nullptr, &type, nullptr, nullptr) == ERROR_SUCCESS
-            && type == REG_DWORD) {
-            DWORD value;
-            DWORD size = sizeof(result);
-            if (RegQueryValueEx(handle, subKey, nullptr, nullptr, reinterpret_cast<unsigned char *>(&value), &size) == ERROR_SUCCESS)
-                result = value;
-        }
-        RegCloseKey(handle);
-    }
-    return result;
-}
-
 DWORD QWindowsContext::readAdvancedExplorerSettings(const wchar_t *subKey, DWORD defaultValue)
 {
-    return readDwordRegistrySetting(L"Software\\Microsoft\\Windows\\CurrentVersion\\Explorer\\Advanced",
-                                    subKey, defaultValue);
+    const auto value =
+        QWinRegistryKey(HKEY_CURRENT_USER,
+                        LR"(Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced)")
+                       .dwordValue(subKey);
+    return value.second ? value.first : defaultValue;
 }
 
 static inline bool isEmptyRect(const RECT &rect)
diff --git a/src/plugins/platforms/windows/qwindowsservices.cpp b/src/plugins/platforms/windows/qwindowsservices.cpp
index b2b1dee232..83b052bb49 100644
--- a/src/plugins/platforms/windows/qwindowsservices.cpp
+++ b/src/plugins/platforms/windows/qwindowsservices.cpp
@@ -45,6 +45,8 @@
 #include <QtCore/qdebug.h>
 #include <QtCore/qdir.h>
 
+#include <QtCore/private/qwinregistry_p.h>
+
 #include <shlobj.h>
 #include <intshcut.h>
 
@@ -78,35 +80,24 @@ static inline QString mailCommand()
 
     const wchar_t mailUserKey[] = L"Software\\Microsoft\\Windows\\Shell\\Associations\\UrlAssociations\\mailto\\UserChoice";
 
-    wchar_t command[MAX_PATH] = {0};
     // Check if user has set preference, otherwise use default.
-    HKEY handle;
-    QString keyName;
-    if (!RegOpenKeyEx(HKEY_CURRENT_USER, mailUserKey, 0, KEY_READ, &handle)) {
-        DWORD bufferSize = BufferSize;
-        if (!RegQueryValueEx(handle, L"Progid", nullptr, nullptr, reinterpret_cast<unsigned char*>(command), &bufferSize))
-            keyName = QString::fromWCharArray(command);
-        RegCloseKey(handle);
-    }
+    QString keyName = QWinRegistryKey(HKEY_CURRENT_USER, mailUserKey)
+                      .stringValue( L"Progid");
     const QLatin1String mailto = keyName.isEmpty() ? QLatin1String("mailto") : QLatin1String();
     keyName += mailto + QLatin1String("\\Shell\\Open\\Command");
     if (debug)
         qDebug() << __FUNCTION__ << "keyName=" << keyName;
-    command[0] = 0;
-    if (!RegOpenKeyExW(HKEY_CLASSES_ROOT, reinterpret_cast<const wchar_t*>(keyName.utf16()), 0, KEY_READ, &handle)) {
-        DWORD bufferSize = BufferSize;
-        RegQueryValueEx(handle, L"", nullptr, nullptr, reinterpret_cast<unsigned char*>(command), &bufferSize);
-        RegCloseKey(handle);
-    }
+    const QString command = QWinRegistryKey(HKEY_CLASSES_ROOT, keyName).stringValue(L"");
     // QTBUG-57816: As of Windows 10, if there is no mail client installed, an entry like
     // "rundll32.exe .. url.dll,MailToProtocolHandler %l" is returned. Launching it
     // silently fails or brings up a broken dialog after a long time, so exclude it and
     // fall back to ShellExecute() which brings up the URL assocation dialog.
-    if (!command[0] || wcsstr(command, L",MailToProtocolHandler") != nullptr)
+    if (command.isEmpty() || command.contains(QLatin1String(",MailToProtocolHandler")))
         return QString();
     wchar_t expandedCommand[MAX_PATH] = {0};
-    return ExpandEnvironmentStrings(command, expandedCommand, MAX_PATH) ?
-           QString::fromWCharArray(expandedCommand) : QString::fromWCharArray(command);
+    return ExpandEnvironmentStrings(reinterpret_cast<const wchar_t *>(command.utf16()),
+                                    expandedCommand, MAX_PATH)
+        ? QString::fromWCharArray(expandedCommand) : command;
 }
 
 static inline bool launchMail(const QUrl &url)