ClangPchManager: Filter system include search paths

We want the include paths from outside the project handled as system
include paths. This is speeding up the PCH creation.

Task-number: QTCREATORBUG-21955
Change-Id: Ic80102f46f5a14897c7ef43da5efd4c0f88abbbc
Reviewed-by: Ivan Donchevskii <ivan.donchevskii@qt.io>

src/plugins/clangpchmanager/projectupdater.cpp

@@ -37,6 +37,9 @@
 #include <cpptools/compileroptionsbuilder.h>
 #include <cpptools/projectpart.h>
 #include <cpptools/headerpathfilter.h>
+#include <projectexplorer/project.h>
+#include <projectexplorer/target.h>
+#include <projectexplorer/buildconfiguration.h>
 
 #include <utils/algorithm.h>
 
@@ -231,6 +234,21 @@ ClangBackEnd::IncludeSearchPaths convertToIncludeSearchPaths(
     return paths;
 }
 
+QString projectDirectory(ProjectExplorer::Project *project)
+{
+    if (project)
+        return project->rootProjectDirectory().toString();
+
+    return {};
+}
+
+QString buildDirectory(ProjectExplorer::Project *project)
+{
+    if (project && project->activeTarget() && project->activeTarget()->activeBuildConfiguration())
+        return project->activeTarget()->activeBuildConfiguration()->buildDirectory().toString();
+
+    return {};
+}
 } // namespace
 
 ProjectUpdater::SystemAndProjectIncludeSearchPaths ProjectUpdater::createIncludeSearchPaths(
@@ -239,7 +257,9 @@ ProjectUpdater::SystemAndProjectIncludeSearchPaths ProjectUpdater::createInclude
     CppTools::HeaderPathFilter filter(projectPart,
                                       CppTools::UseTweakedHeaderPaths::Yes,
                                       CLANG_VERSION,
-                                      CLANG_RESOURCE_DIR);
+                                      CLANG_RESOURCE_DIR,
+                                      projectDirectory(projectPart.project),
+                                      buildDirectory(projectPart.project));
     filter.process();
 
     return {convertToIncludeSearchPaths(filter.systemHeaderPaths, filter.builtInHeaderPaths),

tests/unit/mockup/projectexplorer/buildconfiguration.h

@@ -0,0 +1,37 @@
+/****************************************************************************
+**
+** Copyright (C) 2019 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/fileutils.h>
+
+namespace ProjectExplorer {
+
+class BuildConfiguration
+{
+public:
+    Utils::FileName buildDirectory() const { return {}; }
+}; // namespace Target
+} // namespace ProjectExplorer

tests/unit/mockup/projectexplorer/project.h

@@ -25,6 +25,8 @@
 
 #pragma once
 
+#include "target.h"
+
 #include <projectexplorer/kit.h>
 
 #include <utils/fileutils.h>
@@ -35,13 +37,10 @@ class Project : public QObject {
 public:
     Project() = default;
 
-    Utils::FileName projectDirectory() const {
-        return Utils::FileName();
-    }
+    Utils::FileName projectDirectory() const { return {}; }
 
-    Utils::FileName rootProjectDirectory() const {
-        return Utils::FileName();
-    }
+    Utils::FileName rootProjectDirectory() const { return {}; }
+
+    Target *activeTarget() const { return {}; }
 };
-
-}
+} // namespace ProjectExplorer

tests/unit/mockup/projectexplorer/target.h

@@ -0,0 +1,39 @@
+/****************************************************************************
+**
+** Copyright (C) 2019 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 "buildconfiguration.h"
+
+#include <utils/fileutils.h>
+
+namespace ProjectExplorer {
+
+class Target
+{
+public:
+    BuildConfiguration *activeBuildConfiguration() const { return {}; }
+};
+} // namespace ProjectExplorer