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diff --git a/src/libs/clangsupport/compilermacro.h b/src/libs/clangsupport/compilermacro.h
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+++ b/src/libs/clangsupport/compilermacro.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 <utils/smallstringio.h>
+
+#include <vector>
+
+namespace ClangBackEnd {
+
+class CompilerMacro
+{
+public:
+    constexpr CompilerMacro() = default;
+
+    CompilerMacro(Utils::SmallString &&key,
+                  Utils::SmallString &&value)
+        : key(std::move(key)),
+          value(std::move(value))
+    {}
+
+    friend QDataStream &operator<<(QDataStream &out, const CompilerMacro &compilerMacro)
+    {
+        out << compilerMacro.key;
+        out << compilerMacro.value;
+
+        return out;
+    }
+
+    friend QDataStream &operator>>(QDataStream &in, CompilerMacro &compilerMacro)
+    {
+        in >> compilerMacro.key;
+        in >> compilerMacro.value;
+
+        return in;
+    }
+
+    friend bool operator==(const CompilerMacro &first, const CompilerMacro &second)
+    {
+        return first.key == second.key
+            && first.value == second.value;
+    }
+
+    friend bool operator<(const CompilerMacro &first, const CompilerMacro &second)
+    {
+        return std::tie(first.key, first.value) < std::tie(second.key, second.value);
+    }
+
+public:
+    Utils::SmallString key;
+    Utils::SmallString value;
+};
+
+using CompilerMacros = std::vector<CompilerMacro>;
+}