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diff --git a/src/corelib/text/qdoublescanprint_p.h b/src/corelib/text/qdoublescanprint_p.h
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+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtCore module 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 QDOUBLESCANPRINT_P_H
+#define QDOUBLESCANPRINT_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists for the convenience
+// of internal files.  This header file may change from version to version
+// without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <qglobal.h>
+
+#if defined(Q_CC_MSVC) && (defined(QT_BOOTSTRAPPED) || defined(QT_NO_DOUBLECONVERSION))
+#  include <stdio.h>
+#  include <locale.h>
+
+QT_BEGIN_NAMESPACE
+
+// We can always use _sscanf_l and _snprintf_l on MSVC as those were introduced in 2005.
+
+// MSVC doesn't document what it will do with a NULL locale passed to _sscanf_l or _snprintf_l.
+// The documentation for _create_locale() does not formally document "C" to be valid, but an example
+// code snippet in the same documentation shows it.
+
+struct QCLocaleT {
+    QCLocaleT() : locale(_create_locale(LC_ALL, "C"))
+    {
+    }
+
+    ~QCLocaleT()
+    {
+        _free_locale(locale);
+    }
+
+    const _locale_t locale;
+};
+
+#  define QT_CLOCALE_HOLDER Q_GLOBAL_STATIC(QCLocaleT, cLocaleT)
+#  define QT_CLOCALE cLocaleT()->locale
+
+inline int qDoubleSscanf(const char *buf, _locale_t locale, const char *format, double *d,
+                         int *processed)
+{
+    return _sscanf_l(buf, format, locale, d, processed);
+}
+
+inline int qDoubleSnprintf(char *buf, size_t buflen, _locale_t locale, const char *format, double d)
+{
+    return _snprintf_l(buf, buflen, format, locale, d);
+}
+
+QT_END_NAMESPACE
+
+#elif defined(QT_BOOTSTRAPPED)
+#  include <stdio.h>
+
+QT_BEGIN_NAMESPACE
+
+// When bootstrapping we don't have libdouble-conversion available, yet. We can also not use locale
+// aware snprintf and sscanf variants in the general case because those are only available on select
+// platforms. We can use the regular snprintf and sscanf because we don't do setlocale(3) when
+// bootstrapping and the locale is always "C" then.
+
+#  define QT_CLOCALE_HOLDER
+#  define QT_CLOCALE 0
+
+inline int qDoubleSscanf(const char *buf, int, const char *format, double *d, int *processed)
+{
+    return sscanf(buf, format, d, processed);
+}
+inline int qDoubleSnprintf(char *buf, size_t buflen, int, const char *format, double d)
+{
+    return snprintf(buf, buflen, format, d);
+}
+
+QT_END_NAMESPACE
+
+#else // !QT_BOOTSTRAPPED && (!Q_CC_MSVC || !QT_NO_DOUBLECONVERSION)
+#  ifdef QT_NO_DOUBLECONVERSION
+#    include <stdio.h>
+#    include <xlocale.h>
+
+QT_BEGIN_NAMESPACE
+
+// OS X and FreeBSD both treat NULL as the "C" locale for snprintf_l and sscanf_l.
+// When other implementations with different behavior show up, we'll have to do newlocale(3) and
+// freelocale(3) here. The arguments to those will depend on what the other implementations will
+// offer. OS X and FreeBSD again interpret a locale name of NULL as "C", but "C" itself is not
+// documented as valid locale name. Mind that the names of the LC_* constants differ between e.g.
+// BSD variants and linux.
+
+#    define QT_CLOCALE_HOLDER
+#    define QT_CLOCALE NULL
+
+inline int qDoubleSscanf(const char *buf, locale_t locale, const char *format, double *d,
+                         int *processed)
+{
+    return sscanf_l(buf, locale, format, d, processed);
+}
+inline int qDoubleSnprintf(char *buf, size_t buflen, locale_t locale, const char *format, double d)
+{
+    return snprintf_l(buf, buflen, locale, format, d);
+}
+
+QT_END_NAMESPACE
+
+#  else // !QT_NO_DOUBLECONVERSION
+#    include <double-conversion/double-conversion.h>
+#    define QT_CLOCALE_HOLDER
+#  endif // QT_NO_DOUBLECONVERSION
+#endif // QT_BOOTSTRAPPED
+
+#endif // QDOUBLESCANPRINT_P_H