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diff --git a/src/libs/clangsupport/filestatuscache.h b/src/libs/clangsupport/filestatuscache.h
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+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt Creator.
+**
+** 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 General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** 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-3.0.html.
+**
+****************************************************************************/
+
+#pragma once
+
+#include <filepathcachinginterface.h>
+
+QT_FORWARD_DECLARE_CLASS(QFileInfo)
+
+namespace ClangBackEnd {
+
+class FileSystemInterface;
+
+namespace Internal {
+class FileStatusCacheEntry
+{
+public:
+    FileStatusCacheEntry(ClangBackEnd::FilePathId filePathId,
+                         long long lastModified = 0)
+        : filePathId(filePathId),
+          lastModified(lastModified)
+    {}
+
+    friend bool operator<(FileStatusCacheEntry first, FileStatusCacheEntry second)
+    {
+        return first.filePathId < second.filePathId;
+    }
+
+    friend bool operator<(FileStatusCacheEntry first, FilePathId second)
+    {
+        return first.filePathId < second;
+    }
+
+    friend bool operator<(FilePathId first, FileStatusCacheEntry second)
+    {
+        return first < second.filePathId;
+    }
+
+public:
+    FilePathId filePathId;
+    long long lastModified;
+};
+
+using FileStatusCacheEntries = std::vector<FileStatusCacheEntry>;
+
+}
+
+class CLANGSUPPORT_EXPORT FileStatusCache
+{
+public:
+    using size_type = Internal::FileStatusCacheEntries::size_type;
+
+    FileStatusCache(FileSystemInterface &fileSystem)
+        : m_fileSystem(fileSystem)
+    {}
+    FileStatusCache &operator=(const FileStatusCache &) = delete;
+    FileStatusCache(const FileStatusCache &) = delete;
+
+    long long lastModifiedTime(FilePathId filePathId) const;
+    void update(FilePathId filePathId);
+    void update(FilePathIds filePathIds);
+    FilePathIds modified(FilePathIds filePathIds) const;
+
+    size_type size() const;
+
+private:
+    Internal::FileStatusCacheEntry findEntry(FilePathId filePathId) const;
+
+private:
+    mutable Internal::FileStatusCacheEntries m_cacheEntries;
+    FileSystemInterface &m_fileSystem;
+};
+
+} // namespace ClangBackEnd