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diff --git a/src/lib/corelib/tools/error.cpp b/src/lib/corelib/tools/error.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the Qt Build Suite.
+**
+** 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 Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/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 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+****************************************************************************/
+
+#include "error.h"
+
+#include <QSharedData>
+#include <QStringList>
+
+namespace qbs {
+
+class ErrorItem::ErrorItemPrivate : public QSharedData
+{
+public:
+    QString description;
+    CodeLocation codeLocation;
+};
+
+/*!
+ * \class ErrorData
+ * \brief The \c ErrorData class describes (part of) an error resulting from a qbs operation.
+ * It is always delivered as part of an \c Error.
+ * \sa Error
+ */
+
+ErrorItem::ErrorItem() : d(new ErrorItemPrivate)
+{
+}
+
+ErrorItem::ErrorItem(const QString &description, const CodeLocation &codeLocation)
+    : d(new ErrorItemPrivate)
+{
+    d->description = description;
+    d->codeLocation = codeLocation;
+}
+
+ErrorItem::ErrorItem(const ErrorItem &rhs) : d(rhs.d)
+{
+}
+
+ErrorItem &ErrorItem::operator=(const ErrorItem &other)
+{
+    d = other.d;
+    return *this;
+}
+
+ErrorItem::~ErrorItem()
+{
+}
+
+QString ErrorItem::description() const
+{
+    return d->description;
+}
+
+CodeLocation ErrorItem::codeLocation() const
+{
+    return d->codeLocation;
+}
+
+/*!
+ * \fn const QString &ErrorData::description() const
+ * \brief A general description of the error.
+ */
+
+ /*!
+  * \fn const QString &ErrorData::codeLocation() const
+  * \brief The location at which file in which the error occurred.
+  * \note This information might not be applicable, in which case location().isValid() returns false
+  */
+
+/*!
+ * \brief A full textual description of the error using all available information.
+ */
+QString ErrorItem::toString() const
+{
+    QString str = codeLocation().toString();
+    if (!str.isEmpty())
+        str += QLatin1Char(' ');
+    return str += description();
+}
+
+
+class ErrorInfo::ErrorInfoPrivate : public QSharedData
+{
+public:
+    ErrorInfoPrivate() : internalError(false) { }
+
+    QList<ErrorItem> items;
+    bool internalError;
+};
+
+/*!
+ * \class Error
+ * \brief Represents an error resulting from a qbs operation.
+ * It is made up of one or more \c ErrorData objects.
+ * \sa ErrorData
+ */
+
+ErrorInfo::ErrorInfo() : d(new ErrorInfoPrivate)
+{
+}
+
+ErrorInfo::ErrorInfo(const ErrorInfo &rhs) : d(rhs.d)
+{
+}
+
+ErrorInfo::ErrorInfo(const QString &description, const CodeLocation &location, bool internalError)
+    : d(new ErrorInfoPrivate)
+{
+    append(description, location);
+    d->internalError = internalError;
+}
+
+ErrorInfo &ErrorInfo::operator =(const ErrorInfo &other)
+{
+    d = other.d;
+    return *this;
+}
+
+ErrorInfo::~ErrorInfo()
+{
+}
+
+void ErrorInfo::append(const QString &description, const CodeLocation &location)
+{
+    d->items.append(ErrorItem(description, location));
+}
+
+void ErrorInfo::prepend(const QString &description, const CodeLocation &location)
+{
+    d->items.prepend(ErrorItem(description, location));
+}
+
+/*!
+ * \brief A list of concrete error description.
+ * Most often, there will be one element in this list, but there can be more e.g. to illustrate
+ * how an error condition propagates through several source files.
+ */
+QList<ErrorItem> ErrorInfo::items() const
+{
+    return d->items;
+}
+
+void ErrorInfo::clear()
+{
+    d->items.clear();
+}
+
+/*!
+ * \brief A complete textual description of the error.
+ * All "sub-errors" will be represented.
+ * \sa Error::entries()
+ */
+QString ErrorInfo::toString() const
+{
+    QStringList lines;
+    foreach (const ErrorItem &e, d->items)
+        lines.append(e.toString());
+    return lines.join(QLatin1String("\n"));
+}
+
+/*!
+ * \brief Returns true if this error represents a bug in qbs, false otherwise.
+ */
+bool ErrorInfo::isInternalError() const
+{
+    return d->internalError;
+}
+
+} // namespace qbs