Plugins: Add compilation database plugin

Introduce compilation database project support.

Pass the arguments list for each file directly to
ClangCodeModel via extraCodeModelFlags therefore
introduce a dependency from the ClangCodeModel plugin.

Change-Id: Iea5760d379de1ea246382dce56de0adf7ab5673d
Task-number: QTCREATORBUG-21115
Reviewed-by: Marco Bubke <marco.bubke@qt.io>

src/plugins/compilationdatabaseprojectmanager/compilationdatabaseproject.h

@@ -0,0 +1,63 @@
+/****************************************************************************
+**
+** Copyright (C) 2018 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 <projectexplorer/project.h>
+
+#include <texteditor/texteditor.h>
+
+#include <QFutureWatcher>
+
+namespace CppTools {
+class CppProjectUpdater;
+}
+
+namespace CompilationDatabaseProjectManager {
+namespace Internal {
+
+class CompilationDatabaseProject : public ProjectExplorer::Project
+{
+    Q_OBJECT
+
+public:
+    explicit CompilationDatabaseProject(const Utils::FileName &filename);
+    ~CompilationDatabaseProject() override;
+
+private:
+    QFutureWatcher<void> m_parserWatcher;
+    std::unique_ptr<CppTools::CppProjectUpdater> m_cppCodeModelUpdater;
+};
+
+class CompilationDatabaseEditorFactory : public TextEditor::TextEditorFactory
+{
+    Q_OBJECT
+
+public:
+    CompilationDatabaseEditorFactory();
+};
+
+} // namespace Internal
+} // namespace CompilationDatabaseProjectManager