Clang: Provide the language option to the backend

Provide the language option (e.g. "-x c++-header") when registering a
translation unit for the editor.

Task-number: QTCREATORBUG-14787
Change-Id: Ie06f9fdab302f1b21ba72cdb65b6aabf9f7bc04c
Reviewed-by: Erik Verbruggen <erik.verbruggen@theqtcompany.com>

src/tools/clangbackend/ipcsource/commandlinearguments.cpp

@@ -0,0 +1,61 @@
+/****************************************************************************
+**
+** Copyright (C) 2015 The Qt Company Ltd.
+** Contact: http://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 http://www.qt.io/terms-conditions.  For further information
+** use the contact form at http://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 2.1 or version 3 as published by the Free
+** Software Foundation and appearing in the file LICENSE.LGPLv21 and
+** LICENSE.LGPLv3 included in the packaging of this file.  Please review the
+** following information to ensure the GNU Lesser General Public License
+** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, The Qt Company gives you certain additional
+** rights.  These rights are described in The Qt Company LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+****************************************************************************/
+
+#include "commandlinearguments.h"
+
+namespace ClangBackEnd {
+
+CommandLineArguments::CommandLineArguments(const std::vector<const char *> &projectPartArguments,
+                                           const Utf8StringVector &fileArguments,
+                                           bool addVerboseOption)
+{
+    const auto elementsToReserve = projectPartArguments.size()
+            + uint(fileArguments.size())
+            + (addVerboseOption ? 1 : 0);
+    m_arguments.reserve(elementsToReserve);
+
+    m_arguments = projectPartArguments;
+    for (const auto &argument : fileArguments)
+        m_arguments.push_back(argument.constData());
+    if (addVerboseOption)
+        m_arguments.push_back("-v");
+}
+
+const char * const *CommandLineArguments::data() const
+{
+    return m_arguments.data();
+}
+
+int CommandLineArguments::count() const
+{
+    return int(m_arguments.size());
+}
+
+} // namespace ClangBackEnd