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++ // Copyright (C) 2026 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
++
++ #include <private/qtracecallback_p.h>
++
++ QT_BEGIN_NAMESPACE
++
++ QTraceCallbackFunction qtTraceCallbackFunction = nullptr;
++
++ QTraceCallbackFunction qSetTraceCallback(QTraceCallbackFunction callback)
++ {
++ QTraceCallbackFunction previous = qtTraceCallbackFunction;
++ qtTraceCallbackFunction = callback;
++ return previous;
++ }
++
++ QT_END_NAMESPACE