CppTools: Use only const pointers for ProjectInfo and ProjectPart

All members were already const, but this makes it clear at all points of
use that these data structures are immutable.

Change-Id: Iea615c090bde462c445d15223caccc561b0c713d
Reviewed-by: Jarek Kobus <jaroslaw.kobus@qt.io>

70 files changed, 284 insertions, 271 deletions

diff --git a/src/plugins/autotest/autotestunittests.cpp b/src/plugins/autotest/autotestunittests.cpp
index 27badd7beb..f7e998db58 100644
--- a/src/plugins/autotest/autotestunittests.cpp
+++ b/src/plugins/autotest/autotestunittests.cpp
@@ -255,7 +255,7 @@ void AutoTestUnitTests::testCodeParserBoostTest()
     QFETCH(QString, projectFilePath);
     QFETCH(QString, extension);
     CppTools::Tests::ProjectOpenerAndCloser projectManager;
-    const CppTools::ProjectInfo::Ptr projectInfo
+    const CppTools::ProjectInfo::ConstPtr projectInfo
             = projectManager.open(projectFilePath, true, m_kit);
     QVERIFY(projectInfo);
 
diff --git a/src/plugins/autotest/boost/boosttestparser.cpp b/src/plugins/autotest/boost/boosttestparser.cpp
index c285d49b39..0b3dbc683b 100644
--- a/src/plugins/autotest/boost/boosttestparser.cpp
+++ b/src/plugins/autotest/boost/boosttestparser.cpp
@@ -126,10 +126,11 @@ bool BoostTestParser::processDocument(QFutureInterface<TestParseResultPtr> futur
         return false;
 
     const CppTools::CppModelManager *modelManager = CppTools::CppModelManager::instance();
-    const QList<CppTools::ProjectPart::Ptr> projectParts = modelManager->projectPart(fileName);
+    const QList<CppTools::ProjectPart::ConstPtr> projectParts
+            = modelManager->projectPart(fileName);
     if (projectParts.isEmpty()) // happens if shutting down while parsing
         return false;
-    const CppTools::ProjectPart::Ptr projectPart = projectParts.first();
+    const CppTools::ProjectPart::ConstPtr projectPart = projectParts.first();
     const auto projectFile = Utils::FilePath::fromString(projectPart->projectFile);
     const QByteArray &fileContent = getFileContent(fileName);
 
diff --git a/src/plugins/autotest/catch/catchtestparser.cpp b/src/plugins/autotest/catch/catchtestparser.cpp
index 933fda35fd..9638f85fd3 100644
--- a/src/plugins/autotest/catch/catchtestparser.cpp
+++ b/src/plugins/autotest/catch/catchtestparser.cpp
@@ -133,11 +133,11 @@ bool CatchTestParser::processDocument(QFutureInterface<TestParseResultPtr> futur
     }
 
 
-    const QList<CppTools::ProjectPart::Ptr> projectParts = modelManager->projectPart(fileName);
+    const QList<CppTools::ProjectPart::ConstPtr> projectParts = modelManager->projectPart(fileName);
     if (projectParts.isEmpty()) // happens if shutting down while parsing
         return false;
     Utils::FilePath proFile;
-    const CppTools::ProjectPart::Ptr projectPart = projectParts.first();
+    const CppTools::ProjectPart::ConstPtr projectPart = projectParts.first();
     proFile = Utils::FilePath::fromString(projectPart->projectFile);
 
     CatchCodeParser codeParser(fileContent, projectPart->languageFeatures);
diff --git a/src/plugins/autotest/gtest/gtestparser.cpp b/src/plugins/autotest/gtest/gtestparser.cpp
index 35f00e2c94..8827045b68 100644
--- a/src/plugins/autotest/gtest/gtestparser.cpp
+++ b/src/plugins/autotest/gtest/gtestparser.cpp
@@ -116,7 +116,7 @@ bool GTestParser::processDocument(QFutureInterface<TestParseResultPtr> futureInt
 
     const QMap<GTestCaseSpec, GTestCodeLocationList> result = visitor.gtestFunctions();
     Utils::FilePath proFile;
-    const QList<CppTools::ProjectPart::Ptr> &ppList = modelManager->projectPart(filePath);
+    const QList<CppTools::ProjectPart::ConstPtr> &ppList = modelManager->projectPart(filePath);
     if (!ppList.isEmpty())
         proFile = Utils::FilePath::fromString(ppList.first()->projectFile);
     else
diff --git a/src/plugins/autotest/gtest/gtesttreeitem.cpp b/src/plugins/autotest/gtest/gtesttreeitem.cpp
index fcdc98316d..071db307e0 100644
--- a/src/plugins/autotest/gtest/gtesttreeitem.cpp
+++ b/src/plugins/autotest/gtest/gtesttreeitem.cpp
@@ -528,10 +528,10 @@ QSet<QString> internalTargets(const TestTreeItem &item)
         return {};
     const Utils::FilePath filePath = item.filePath();
     const QString file = filePath.toString();
-    const QVector<CppTools::ProjectPart::Ptr> projectParts = projectInfo->projectParts();
+    const QVector<CppTools::ProjectPart::ConstPtr> projectParts = projectInfo->projectParts();
     if (projectParts.isEmpty())
         return cppMM->dependingInternalTargets(item.filePath());
-    for (const CppTools::ProjectPart::Ptr &projectPart : projectParts) {
+    for (const CppTools::ProjectPart::ConstPtr &projectPart : projectParts) {
         if (Utils::FilePath::fromString(projectPart->projectFile) == item.proFile()
                 && Utils::anyOf(projectPart->files, [&file] (const CppTools::ProjectFile &pf) {
                                 return pf.path == file;
diff --git a/src/plugins/autotest/itestparser.cpp b/src/plugins/autotest/itestparser.cpp
index b11393b952..08ac83b98a 100644
--- a/src/plugins/autotest/itestparser.cpp
+++ b/src/plugins/autotest/itestparser.cpp
@@ -54,7 +54,7 @@ void CppParser::init(const Utils::FilePaths &filesToParse, bool fullParse)
 
 bool CppParser::selectedForBuilding(const Utils::FilePath &fileName)
 {
-    QList<CppTools::ProjectPart::Ptr> projParts =
+    QList<CppTools::ProjectPart::ConstPtr> projParts =
             CppTools::CppModelManager::instance()->projectPart(fileName);
 
     return !projParts.isEmpty() && projParts.at(0)->selectedForBuilding;
@@ -83,7 +83,7 @@ bool precompiledHeaderContains(const CPlusPlus::Snapshot &snapshot,
                                const std::function<bool(const QString &)> &checker)
 {
     const CppTools::CppModelManager *modelManager = CppTools::CppModelManager::instance();
-    const QList<CppTools::ProjectPart::Ptr> projectParts = modelManager->projectPart(filePath);
+    const QList<CppTools::ProjectPart::ConstPtr> projectParts = modelManager->projectPart(filePath);
     if (projectParts.isEmpty())
         return false;
     const QStringList precompiledHeaders = projectParts.first()->precompiledHeaders;
diff --git a/src/plugins/autotest/loadprojectscenario.cpp b/src/plugins/autotest/loadprojectscenario.cpp
index 2013d1a582..fb209f3594 100644
--- a/src/plugins/autotest/loadprojectscenario.cpp
+++ b/src/plugins/autotest/loadprojectscenario.cpp
@@ -92,7 +92,8 @@ bool LoadProjectScenario::loadProject()
 
     CppTools::Tests::ProjectOpenerAndCloser projectManager;
     // This code must trigger a call to PluginManager::finishScenario() at some later point.
-    const CppTools::ProjectInfo::Ptr projectInfo = projectManager.open(projectFilePath, true, m_kit);
+    const CppTools::ProjectInfo::ConstPtr projectInfo = projectManager.open(projectFilePath,
+                                                                            true, m_kit);
     return projectInfo.get();
 }
 
diff --git a/src/plugins/autotest/qtest/qttestparser.cpp b/src/plugins/autotest/qtest/qttestparser.cpp
index e6dfb7802a..38527babc5 100644
--- a/src/plugins/autotest/qtest/qttestparser.cpp
+++ b/src/plugins/autotest/qtest/qttestparser.cpp
@@ -93,7 +93,7 @@ static bool includesQtTest(const CPlusPlus::Document::Ptr &doc, const CPlusPlus:
 
 static bool qtTestLibDefined(const Utils::FilePath &fileName)
 {
-    const QList<CppTools::ProjectPart::Ptr> parts =
+    const QList<CppTools::ProjectPart::ConstPtr> parts =
             CppTools::CppModelManager::instance()->projectPart(fileName);
     if (parts.size() > 0) {
         return Utils::anyOf(parts.at(0)->projectMacros, [] (const ProjectExplorer::Macro &macro) {
@@ -327,7 +327,8 @@ bool QtTestParser::processDocument(QFutureInterface<TestParseResultPtr> futureIn
             if (earlyReturn.has_value() || !data.valid)
                 continue;
 
-            QList<CppTools::ProjectPart::Ptr> projectParts = modelManager->projectPart(fileName);
+            QList<CppTools::ProjectPart::ConstPtr> projectParts
+                    = modelManager->projectPart(fileName);
             if (projectParts.isEmpty()) // happens if shutting down while parsing
                 return false;
 
diff --git a/src/plugins/autotest/quick/quicktestparser.cpp b/src/plugins/autotest/quick/quicktestparser.cpp
index 70875d4bd0..8d2083cd9d 100644
--- a/src/plugins/autotest/quick/quicktestparser.cpp
+++ b/src/plugins/autotest/quick/quicktestparser.cpp
@@ -101,7 +101,7 @@ static bool includesQtQuickTest(const CPlusPlus::Document::Ptr &doc,
 static QString quickTestSrcDir(const CppTools::CppModelManager *cppMM,
                                const Utils::FilePath &fileName)
 {
-    const QList<CppTools::ProjectPart::Ptr> parts = cppMM->projectPart(fileName);
+    const QList<CppTools::ProjectPart::ConstPtr> parts = cppMM->projectPart(fileName);
     if (parts.size() > 0) {
         const ProjectExplorer::Macros &macros = parts.at(0)->projectMacros;
         auto found = std::find_if(
@@ -267,7 +267,7 @@ bool QuickTestParser::handleQtQuickTest(QFutureInterface<TestParseResultPtr> fut
     if (quickTestName(document).isEmpty())
         return false;
 
-    QList<CppTools::ProjectPart::Ptr> ppList = modelManager->projectPart(document->fileName());
+    QList<CppTools::ProjectPart::ConstPtr> ppList = modelManager->projectPart(document->fileName());
     if (ppList.isEmpty()) // happens if shutting down while parsing
         return false;
     const Utils::FilePath cppFileName = Utils::FilePath::fromString(document->fileName());
diff --git a/src/plugins/autotest/quick/quicktesttreeitem.cpp b/src/plugins/autotest/quick/quicktesttreeitem.cpp
index d47cac6c8e..2b36863d88 100644
--- a/src/plugins/autotest/quick/quicktesttreeitem.cpp
+++ b/src/plugins/autotest/quick/quicktesttreeitem.cpp
@@ -391,7 +391,7 @@ QSet<QString> internalTargets(const Utils::FilePath &proFile)
     const auto projectInfo = cppMM->projectInfo(ProjectExplorer::SessionManager::startupProject());
     if (!projectInfo)
         return {};
-    for (const CppTools::ProjectPart::Ptr &projectPart : projectInfo->projectParts()) {
+    for (const CppTools::ProjectPart::ConstPtr &projectPart : projectInfo->projectParts()) {
         if (projectPart->buildTargetType != ProjectExplorer::BuildTargetType::Executable)
             continue;
         if (projectPart->projectFile == proFile.toString())
diff --git a/src/plugins/baremetal/debugservers/uvsc/uvproject.cpp b/src/plugins/baremetal/debugservers/uvsc/uvproject.cpp
index 7620ace859..d4d5860410 100644
--- a/src/plugins/baremetal/debugservers/uvsc/uvproject.cpp
+++ b/src/plugins/baremetal/debugservers/uvsc/uvproject.cpp
@@ -90,11 +90,11 @@ static void extractAllFiles(const DebuggerRunTool *runTool, QStringList &include
                             FilePaths &headers, FilePaths &sources, FilePaths &assemblers)
 {
     const auto project = runTool->runControl()->project();
-    const CppTools::ProjectInfo::Ptr info = CppModelManager::instance()->projectInfo(project);
+    const CppTools::ProjectInfo::ConstPtr info = CppModelManager::instance()->projectInfo(project);
     if (!info)
         return;
-    const QVector<ProjectPart::Ptr> parts = info->projectParts();
-    for (const ProjectPart::Ptr &part : parts) {
+    const QVector<ProjectPart::ConstPtr> parts = info->projectParts();
+    for (const ProjectPart::ConstPtr &part : parts) {
         for (const ProjectFile &file : qAsConst(part->files)) {
             if (!file.active)
                 continue;
diff --git a/src/plugins/clangcodemodel/clangcodemodelplugin.cpp b/src/plugins/clangcodemodel/clangcodemodelplugin.cpp
index 3c7e055ca3..4f047f36af 100644
--- a/src/plugins/clangcodemodel/clangcodemodelplugin.cpp
+++ b/src/plugins/clangcodemodel/clangcodemodelplugin.cpp
@@ -94,7 +94,7 @@ static bool isDBGenerationEnabled(ProjectExplorer::Project *project)
     using namespace CppTools;
     if (!project)
         return false;
-    const ProjectInfo::Ptr projectInfo = CppModelManager::instance()->projectInfo(project);
+    const ProjectInfo::ConstPtr projectInfo = CppModelManager::instance()->projectInfo(project);
     return projectInfo && !projectInfo->projectParts().isEmpty();
 }
 
diff --git a/src/plugins/clangcodemodel/clangcompletionassistprovider.cpp b/src/plugins/clangcodemodel/clangcompletionassistprovider.cpp
index f743a9aec9..c176afbd3f 100644
--- a/src/plugins/clangcodemodel/clangcompletionassistprovider.cpp
+++ b/src/plugins/clangcodemodel/clangcompletionassistprovider.cpp
@@ -66,7 +66,7 @@ TextEditor::AssistInterface *ClangCompletionAssistProvider::createAssistInterfac
     int position,
     TextEditor::AssistReason reason) const
 {
-    const CppTools::ProjectPart::Ptr projectPart = projectPartForFileBasedOnProcessor(
+    const CppTools::ProjectPart::ConstPtr projectPart = projectPartForFileBasedOnProcessor(
         filePath.toString());
     if (projectPart) {
         return new ClangCompletionAssistInterface(m_communicator,
diff --git a/src/plugins/clangcodemodel/clangeditordocumentprocessor.cpp b/src/plugins/clangcodemodel/clangeditordocumentprocessor.cpp
index c1b825a073..2d22888a7b 100644
--- a/src/plugins/clangcodemodel/clangeditordocumentprocessor.cpp
+++ b/src/plugins/clangcodemodel/clangeditordocumentprocessor.cpp
@@ -171,7 +171,7 @@ bool ClangEditorDocumentProcessor::hasProjectPart() const
     return !m_projectPart.isNull();
 }
 
-CppTools::ProjectPart::Ptr ClangEditorDocumentProcessor::projectPart() const
+CppTools::ProjectPart::ConstPtr ClangEditorDocumentProcessor::projectPart() const
 {
     return m_projectPart;
 }
@@ -421,7 +421,7 @@ ClangEditorDocumentProcessor *ClangEditorDocumentProcessor::get(const QString &f
     return qobject_cast<ClangEditorDocumentProcessor*>(processor);
 }
 
-static bool isProjectPartLoadedOrIsFallback(CppTools::ProjectPart::Ptr projectPart)
+static bool isProjectPartLoadedOrIsFallback(CppTools::ProjectPart::ConstPtr projectPart)
 {
     return projectPart
         && (projectPart->id().isEmpty() || isProjectPartLoaded(projectPart));
@@ -429,7 +429,7 @@ static bool isProjectPartLoadedOrIsFallback(CppTools::ProjectPart::Ptr projectPa
 
 void ClangEditorDocumentProcessor::updateBackendProjectPartAndDocument()
 {
-    const CppTools::ProjectPart::Ptr projectPart = m_parser->projectPartInfo().projectPart;
+    const CppTools::ProjectPart::ConstPtr projectPart = m_parser->projectPartInfo().projectPart;
 
     if (isProjectPartLoadedOrIsFallback(projectPart)) {
         updateBackendDocument(*projectPart.data());
@@ -448,7 +448,7 @@ void ClangEditorDocumentProcessor::onParserFinished()
     updateBackendProjectPartAndDocument();
 }
 
-void ClangEditorDocumentProcessor::updateBackendDocument(CppTools::ProjectPart &projectPart)
+void ClangEditorDocumentProcessor::updateBackendDocument(const CppTools::ProjectPart &projectPart)
 {
     // On registration we send the document content immediately as an unsaved
     // file, because
diff --git a/src/plugins/clangcodemodel/clangeditordocumentprocessor.h b/src/plugins/clangcodemodel/clangeditordocumentprocessor.h
index bedf3fecaf..bc02a16347 100644
--- a/src/plugins/clangcodemodel/clangeditordocumentprocessor.h
+++ b/src/plugins/clangcodemodel/clangeditordocumentprocessor.h
@@ -67,7 +67,7 @@ public:
     bool isParserRunning() const override;
 
     bool hasProjectPart() const;
-    CppTools::ProjectPart::Ptr projectPart() const;
+    CppTools::ProjectPart::ConstPtr projectPart() const;
     void clearProjectPart();
 
     ::Utils::Id diagnosticConfigId() const;
@@ -120,7 +120,7 @@ private:
     void onParserFinished();
 
     void updateBackendProjectPartAndDocument();
-    void updateBackendDocument(CppTools::ProjectPart &projectPart);
+    void updateBackendDocument(const CppTools::ProjectPart &projectPart);
     void updateBackendDocumentIfProjectPartExists();
     void requestAnnotationsFromBackend();
 
@@ -137,7 +137,7 @@ private:
     ClangDiagnosticManager m_diagnosticManager;
     BackendCommunicator &m_communicator;
     QSharedPointer<ClangEditorDocumentParser> m_parser;
-    CppTools::ProjectPart::Ptr m_projectPart;
+    CppTools::ProjectPart::ConstPtr m_projectPart;
     ::Utils::Id m_diagnosticConfigId;
     bool m_isProjectFile = false;
     QFutureWatcher<void> m_parserWatcher;
diff --git a/src/plugins/clangcodemodel/clangmodelmanagersupport.cpp b/src/plugins/clangcodemodel/clangmodelmanagersupport.cpp
index 37bd4bf7b9..f58c0c3ff4 100644
--- a/src/plugins/clangcodemodel/clangmodelmanagersupport.cpp
+++ b/src/plugins/clangcodemodel/clangmodelmanagersupport.cpp
@@ -274,8 +274,8 @@ void ClangModelManagerSupport::connectToWidgetsMarkContextMenuRequested(QWidget
     }
 }
 
-void ClangModelManagerSupport::updateLanguageClient(ProjectExplorer::Project *project,
-                                                    const CppTools::ProjectInfo::Ptr &projectInfo)
+void ClangModelManagerSupport::updateLanguageClient(
+        ProjectExplorer::Project *project, const CppTools::ProjectInfo::ConstPtr &projectInfo)
 {
     if (!CppTools::ClangdProjectSettings(project).settings().useClangd)
         return;
@@ -300,7 +300,8 @@ void ClangModelManagerSupport::updateLanguageClient(ProjectExplorer::Project *pr
             return;
         if (!CppTools::ClangdProjectSettings(project).settings().useClangd)
             return;
-        const CppTools::ProjectInfo::Ptr newProjectInfo = cppModelManager()->projectInfo(project);
+        const CppTools::ProjectInfo::ConstPtr newProjectInfo
+                = cppModelManager()->projectInfo(project);
         if (!newProjectInfo || *newProjectInfo != *projectInfo)
             return;
         if (getJsonDbDir() != jsonDbDir)
@@ -321,7 +322,7 @@ void ClangModelManagerSupport::updateLanguageClient(ProjectExplorer::Project *pr
                 return;
             if (!CppTools::ClangdProjectSettings(project).settings().useClangd)
                 return;
-            const CppTools::ProjectInfo::Ptr newProjectInfo
+            const CppTools::ProjectInfo::ConstPtr newProjectInfo
                 = cppModelManager()->projectInfo(project);
             if (!newProjectInfo || *newProjectInfo != *projectInfo)
                 return;
@@ -615,13 +616,13 @@ void ClangModelManagerSupport::onAboutToRemoveProject(ProjectExplorer::Project *
 void ClangModelManagerSupport::onProjectPartsUpdated(ProjectExplorer::Project *project)
 {
     QTC_ASSERT(project, return);
-    const CppTools::ProjectInfo::Ptr projectInfo = cppModelManager()->projectInfo(project);
+    const CppTools::ProjectInfo::ConstPtr projectInfo = cppModelManager()->projectInfo(project);
     QTC_ASSERT(projectInfo, return);
 
     updateLanguageClient(project, projectInfo);
 
     QStringList projectPartIds;
-    for (const CppTools::ProjectPart::Ptr &projectPart : projectInfo->projectParts())
+    for (const CppTools::ProjectPart::ConstPtr &projectPart : projectInfo->projectParts())
         projectPartIds.append(projectPart->id());
     onProjectPartsRemoved(projectPartIds);
 }
diff --git a/src/plugins/clangcodemodel/clangmodelmanagersupport.h b/src/plugins/clangcodemodel/clangmodelmanagersupport.h
index 5110d22b77..3fa1bdb1f7 100644
--- a/src/plugins/clangcodemodel/clangmodelmanagersupport.h
+++ b/src/plugins/clangcodemodel/clangmodelmanagersupport.h
@@ -130,7 +130,7 @@ private:
     void connectToWidgetsMarkContextMenuRequested(QWidget *editorWidget);
 
     void updateLanguageClient(ProjectExplorer::Project *project,
-                              const CppTools::ProjectInfo::Ptr &projectInfo);
+                              const CppTools::ProjectInfo::ConstPtr &projectInfo);
     ClangdClient *createClient(ProjectExplorer::Project *project, const Utils::FilePath &jsonDbDir);
     void claimNonProjectSources(ClangdClient *fallbackClient);
 
diff --git a/src/plugins/clangcodemodel/clangrefactoringengine.cpp b/src/plugins/clangcodemodel/clangrefactoringengine.cpp
index 662a0894e1..5767c86d74 100644
--- a/src/plugins/clangcodemodel/clangrefactoringengine.cpp
+++ b/src/plugins/clangcodemodel/clangrefactoringengine.cpp
@@ -39,7 +39,7 @@ namespace ClangCodeModel {
 namespace Internal {
 
 void RefactoringEngine::startLocalRenaming(const CppTools::CursorInEditor &data,
-                                           CppTools::ProjectPart *,
+                                           const CppTools::ProjectPart *,
                                            RenameCallback &&renameSymbolsCallback)
 {
     ClangdClient * const client
diff --git a/src/plugins/clangcodemodel/clangrefactoringengine.h b/src/plugins/clangcodemodel/clangrefactoringengine.h
index c4e728b022..cb05242d93 100644
--- a/src/plugins/clangcodemodel/clangrefactoringengine.h
+++ b/src/plugins/clangcodemodel/clangrefactoringengine.h
@@ -42,7 +42,7 @@ class RefactoringEngine : public CppTools::RefactoringEngineInterface
 {
 public:
     void startLocalRenaming(const CppTools::CursorInEditor &data,
-                            CppTools::ProjectPart *projectPart,
+                            const CppTools::ProjectPart *projectPart,
                             RenameCallback &&renameSymbolsCallback) override;
     void globalRename(const CppTools::CursorInEditor &cursor, CppTools::UsagesCallback &&callback,
                       const QString &replacement) override;
diff --git a/src/plugins/clangcodemodel/clangtextmark.cpp b/src/plugins/clangcodemodel/clangtextmark.cpp
index 1db0192359..46b39921d2 100644
--- a/src/plugins/clangcodemodel/clangtextmark.cpp
+++ b/src/plugins/clangcodemodel/clangtextmark.cpp
@@ -87,7 +87,7 @@ ProjectExplorer::Project *projectForCurrentEditor()
         return nullptr;
 
     if (auto processor = ClangEditorDocumentProcessor::get(filePath)) {
-        if (ProjectPart::Ptr projectPart = processor->projectPart())
+        if (ProjectPart::ConstPtr projectPart = processor->projectPart())
             return projectForProjectPart(*projectPart);
     }
 
diff --git a/src/plugins/clangcodemodel/clangutils.cpp b/src/plugins/clangcodemodel/clangutils.cpp
index 1d3fbb7451..269079b0c3 100644
--- a/src/plugins/clangcodemodel/clangutils.cpp
+++ b/src/plugins/clangcodemodel/clangutils.cpp
@@ -109,21 +109,21 @@ private:
     }
 };
 
-ProjectPart::Ptr projectPartForFile(const QString &filePath)
+ProjectPart::ConstPtr projectPartForFile(const QString &filePath)
 {
     if (const auto parser = CppTools::BaseEditorDocumentParser::get(filePath))
         return parser->projectPartInfo().projectPart;
-    return ProjectPart::Ptr();
+    return ProjectPart::ConstPtr();
 }
 
-ProjectPart::Ptr projectPartForFileBasedOnProcessor(const QString &filePath)
+ProjectPart::ConstPtr projectPartForFileBasedOnProcessor(const QString &filePath)
 {
     if (const auto processor = ClangEditorDocumentProcessor::get(filePath))
         return processor->projectPart();
-    return ProjectPart::Ptr();
+    return ProjectPart::ConstPtr();
 }
 
-bool isProjectPartLoaded(const ProjectPart::Ptr projectPart)
+bool isProjectPartLoaded(const ProjectPart::ConstPtr projectPart)
 {
     if (projectPart)
         return !CppModelManager::instance()->projectPartForId(projectPart->id()).isNull();
@@ -132,7 +132,7 @@ bool isProjectPartLoaded(const ProjectPart::Ptr projectPart)
 
 QString projectPartIdForFile(const QString &filePath)
 {
-    const ProjectPart::Ptr projectPart = projectPartForFile(filePath);
+    const ProjectPart::ConstPtr projectPart = projectPartForFile(filePath);
 
     if (isProjectPartLoaded(projectPart))
         return projectPart->id(); // OK, Project Part is still loaded
@@ -371,7 +371,7 @@ static QJsonObject createFileObject(const FilePath &buildDir,
     return fileObject;
 }
 
-GenerateCompilationDbResult generateCompilationDB(const CppTools::ProjectInfo::Ptr projectInfo,
+GenerateCompilationDbResult generateCompilationDB(const CppTools::ProjectInfo::ConstPtr projectInfo,
                                                   CompilationDbPurpose purpose,
                                                   const ClangDiagnosticConfig &warningsConfig,
                                                   const QStringList &projectOptions)
@@ -392,7 +392,7 @@ GenerateCompilationDbResult generateCompilationDB(const CppTools::ProjectInfo::P
     }
     compileCommandsFile.write("[");
 
-    for (ProjectPart::Ptr projectPart : projectInfo->projectParts()) {
+    for (ProjectPart::ConstPtr projectPart : projectInfo->projectParts()) {
         QStringList args;
         if (purpose == CompilationDbPurpose::Project)
             args = projectPartArguments(*projectPart);
diff --git a/src/plugins/clangcodemodel/clangutils.h b/src/plugins/clangcodemodel/clangutils.h
index 82c35f189a..8e5e6a0b28 100644
--- a/src/plugins/clangcodemodel/clangutils.h
+++ b/src/plugins/clangcodemodel/clangutils.h
@@ -61,9 +61,9 @@ QStringList createClangOptions(const CppTools::ProjectPart &projectPart, const Q
                                const CppTools::ClangDiagnosticConfig &warningsConfig,
                                const QStringList &projectOptions);
 
-CppTools::ProjectPart::Ptr projectPartForFile(const QString &filePath);
-CppTools::ProjectPart::Ptr projectPartForFileBasedOnProcessor(const QString &filePath);
-bool isProjectPartLoaded(const CppTools::ProjectPart::Ptr projectPart);
+CppTools::ProjectPart::ConstPtr projectPartForFile(const QString &filePath);
+CppTools::ProjectPart::ConstPtr projectPartForFileBasedOnProcessor(const QString &filePath);
+bool isProjectPartLoaded(const CppTools::ProjectPart::ConstPtr projectPart);
 QString projectPartIdForFile(const QString &filePath);
 int clangColumn(const QTextBlock &line, int cppEditorColumn);
 int cppEditorColumn(const QTextBlock &line, int clangColumn);
@@ -87,7 +87,7 @@ public:
 };
 
 enum class CompilationDbPurpose { Project, CodeModel };
-GenerateCompilationDbResult generateCompilationDB(const CppTools::ProjectInfo::Ptr projectInfo,
+GenerateCompilationDbResult generateCompilationDB(const CppTools::ProjectInfo::ConstPtr projectInfo,
             CompilationDbPurpose purpose, const CppTools::ClangDiagnosticConfig &warningsConfig,
             const QStringList &projectOptions);
 
diff --git a/src/plugins/clangcodemodel/test/clangcodecompletion_test.cpp b/src/plugins/clangcodemodel/test/clangcodecompletion_test.cpp
index 097d74441f..572bb5f1d4 100644
--- a/src/plugins/clangcodemodel/test/clangcodecompletion_test.cpp
+++ b/src/plugins/clangcodemodel/test/clangcodecompletion_test.cpp
@@ -246,7 +246,7 @@ bool OpenEditorAtCursorPosition::waitUntil(const std::function<bool ()> &conditi
     return false;
 }
 
-CppTools::ProjectPart::Ptr createProjectPart(const Utils::FilePath &projectFilePath,
+CppTools::ProjectPart::ConstPtr createProjectPart(const Utils::FilePath &projectFilePath,
                                              const QStringList &files,
                                              const ProjectExplorer::Macros &macros)
 {
@@ -262,15 +262,15 @@ CppTools::ProjectPart::Ptr createProjectPart(const Utils::FilePath &projectFileP
     return ProjectPart::create(projectFilePath, rpp, {}, projectFiles);
 }
 
-CppTools::ProjectInfo::Ptr createProjectInfo(ProjectExplorer::Project *project,
+CppTools::ProjectInfo::ConstPtr createProjectInfo(ProjectExplorer::Project *project,
                                              const QStringList &files,
                                              const ProjectExplorer::Macros &macros)
 {
     using namespace CppTools;
     QTC_ASSERT(project, return {});
 
-    const CppTools::ProjectPart::Ptr projectPart = createProjectPart(project->projectFilePath(),
-                                                                     files, macros);
+    const CppTools::ProjectPart::ConstPtr projectPart
+            = createProjectPart(project->projectFilePath(), files, macros);
     const auto projectInfo = ProjectInfo::create(
                 {project, ProjectExplorer::KitInfo(nullptr), {}, {}}, {projectPart});
     return projectInfo;
@@ -292,7 +292,7 @@ public:
     bool load()
     {
         m_project = m_helper.createProject(QLatin1String("testProject"));
-        const CppTools::ProjectInfo::Ptr projectInfo = createProjectInfo(m_project,
+        const CppTools::ProjectInfo::ConstPtr projectInfo = createProjectInfo(m_project,
                                                                          m_projectFiles,
                                                                          m_projectMacros);
         const QSet<QString> filesIndexedAfterLoading = m_helper.updateProjectInfo(projectInfo);
@@ -302,14 +302,14 @@ public:
     bool updateProject(const ProjectExplorer::Macros &updatedProjectMacros)
     {
         QTC_ASSERT(m_project, return false);
-        const CppTools::ProjectInfo::Ptr updatedProjectInfo
+        const CppTools::ProjectInfo::ConstPtr updatedProjectInfo
                 = createProjectInfo(m_project, m_projectFiles, updatedProjectMacros);
         return updateProjectInfo(updatedProjectInfo);
 
     }
 
 private:
-    bool updateProjectInfo(const CppTools::ProjectInfo::Ptr &projectInfo)
+    bool updateProjectInfo(const CppTools::ProjectInfo::ConstPtr &projectInfo)
     {
         const QSet<QString> filesIndexedAfterLoading = m_helper.updateProjectInfo(projectInfo);
         return m_projectFiles.size() == filesIndexedAfterLoading.size();
diff --git a/src/plugins/clangtools/clangfileinfo.h b/src/plugins/clangtools/clangfileinfo.h
index bc80f7b1b1..29b5857f5d 100644
--- a/src/plugins/clangtools/clangfileinfo.h
+++ b/src/plugins/clangtools/clangfileinfo.h
@@ -41,14 +41,14 @@ public:
     FileInfo() = default;
     FileInfo(Utils::FilePath file,
              CppTools::ProjectFile::Kind kind,
-             CppTools::ProjectPart::Ptr projectPart)
+             CppTools::ProjectPart::ConstPtr projectPart)
         : file(std::move(file))
         , kind(kind)
         , projectPart(projectPart)
     {}
     Utils::FilePath file;
     CppTools::ProjectFile::Kind kind;
-    CppTools::ProjectPart::Ptr projectPart;
+    CppTools::ProjectPart::ConstPtr projectPart;
 };
 using FileInfos = std::vector<FileInfo>;
 
diff --git a/src/plugins/clangtools/clangtool.cpp b/src/plugins/clangtools/clangtool.cpp
index e0fb65114b..52a913bca9 100644
--- a/src/plugins/clangtools/clangtool.cpp
+++ b/src/plugins/clangtools/clangtool.cpp
@@ -325,11 +325,11 @@ private:
     QMap<Utils::FilePath, RefactoringFileInfo> m_refactoringFileInfos;
 };
 
-static FileInfos sortedFileInfos(const QVector<CppTools::ProjectPart::Ptr> &projectParts)
+static FileInfos sortedFileInfos(const QVector<CppTools::ProjectPart::ConstPtr> &projectParts)
 {
     FileInfos fileInfos;
 
-    for (const CppTools::ProjectPart::Ptr &projectPart : projectParts) {
+    for (const CppTools::ProjectPart::ConstPtr &projectPart : projectParts) {
         QTC_ASSERT(projectPart, continue);
         if (!projectPart->selectedForBuilding)
             continue;
diff --git a/src/plugins/clangtools/clangtoolruncontrol.h b/src/plugins/clangtools/clangtoolruncontrol.h
index 3b27d339d9..5f8b613d77 100644
--- a/src/plugins/clangtools/clangtoolruncontrol.h
+++ b/src/plugins/clangtools/clangtoolruncontrol.h
@@ -114,8 +114,8 @@ private:
     Utils::Environment m_environment;
     Utils::TemporaryDirectory m_temporaryDir;
 
-    CppTools::ProjectInfo::Ptr m_projectInfoBeforeBuild;
-    CppTools::ProjectInfo::Ptr m_projectInfo;
+    CppTools::ProjectInfo::ConstPtr m_projectInfoBeforeBuild;
+    CppTools::ProjectInfo::ConstPtr m_projectInfo;
     QString m_targetTriple;
     Utils::Id m_toolChainType;
 
diff --git a/src/plugins/clangtools/documentclangtoolrunner.cpp b/src/plugins/clangtools/documentclangtoolrunner.cpp
index 77937f3f30..482cd78e6f 100644
--- a/src/plugins/clangtools/documentclangtoolrunner.cpp
+++ b/src/plugins/clangtools/documentclangtoolrunner.cpp
@@ -141,12 +141,12 @@ static VirtualFileSystemOverlay &vfso()
 
 static FileInfo getFileInfo(const FilePath &file, Project *project)
 {
-    const ProjectInfo::Ptr projectInfo = CppModelManager::instance()->projectInfo(project);
+    const ProjectInfo::ConstPtr projectInfo = CppModelManager::instance()->projectInfo(project);
     if (!projectInfo)
         return {};
 
     FileInfo candidate;
-    for (const ProjectPart::Ptr &projectPart : projectInfo->projectParts()) {
+    for (const ProjectPart::ConstPtr &projectPart : projectInfo->projectParts()) {
         QTC_ASSERT(projectPart, continue);
 
         for (const ProjectFile &projectFile : qAsConst(projectPart->files)) {
diff --git a/src/plugins/compilationdatabaseprojectmanager/compilationdatabasetests.cpp b/src/plugins/compilationdatabaseprojectmanager/compilationdatabasetests.cpp
index 609db41026..122d596de7 100644
--- a/src/plugins/compilationdatabaseprojectmanager/compilationdatabasetests.cpp
+++ b/src/plugins/compilationdatabaseprojectmanager/compilationdatabasetests.cpp
@@ -77,13 +77,13 @@ void CompilationDatabaseTests::testProject()
     QFETCH(QString, projectFilePath);
 
     CppTools::Tests::ProjectOpenerAndCloser projectManager;
-    const CppTools::ProjectInfo::Ptr projectInfo = projectManager.open(projectFilePath, true);
+    const CppTools::ProjectInfo::ConstPtr projectInfo = projectManager.open(projectFilePath, true);
     QVERIFY(projectInfo);
 
-    QVector<CppTools::ProjectPart::Ptr> projectParts = projectInfo->projectParts();
+    QVector<CppTools::ProjectPart::ConstPtr> projectParts = projectInfo->projectParts();
     QVERIFY(!projectParts.isEmpty());
 
-    CppTools::ProjectPart &projectPart = *projectParts.first();
+    const CppTools::ProjectPart &projectPart = *projectParts.first();
     QVERIFY(!projectPart.headerPaths.isEmpty());
     QVERIFY(!projectPart.projectMacros.isEmpty());
     QVERIFY(!projectPart.toolChainMacros.isEmpty());
diff --git a/src/plugins/cppcheck/cppchecktool.cpp b/src/plugins/cppcheck/cppchecktool.cpp
index a0cd174c2e..d0495d1adf 100644
--- a/src/plugins/cppcheck/cppchecktool.cpp
+++ b/src/plugins/cppcheck/cppchecktool.cpp
@@ -204,21 +204,21 @@ void CppcheckTool::check(const Utils::FilePaths &files)
     if (filtered.isEmpty())
         return;
 
-    const CppTools::ProjectInfo::Ptr info
+    const CppTools::ProjectInfo::ConstPtr info
             = CppTools::CppModelManager::instance()->projectInfo(m_project);
     if (!info)
         return;
-    const QVector<CppTools::ProjectPart::Ptr> parts = info->projectParts();
+    const QVector<CppTools::ProjectPart::ConstPtr> parts = info->projectParts();
     if (parts.size() == 1) {
         QTC_ASSERT(parts.first(), return);
         addToQueue(filtered, *parts.first());
         return;
     }
 
-    std::map<CppTools::ProjectPart::Ptr, Utils::FilePaths> groups;
+    std::map<CppTools::ProjectPart::ConstPtr, Utils::FilePaths> groups;
     for (const Utils::FilePath &file : qAsConst(filtered)) {
         const QString stringed = file.toString();
-        for (const CppTools::ProjectPart::Ptr &part : parts) {
+        for (const CppTools::ProjectPart::ConstPtr &part : parts) {
             using CppTools::ProjectFile;
             QTC_ASSERT(part, continue);
             const auto match = [stringed](const ProjectFile &pFile){return pFile.path == stringed;};
@@ -231,7 +231,7 @@ void CppcheckTool::check(const Utils::FilePaths &files)
         addToQueue(group.second, *group.first);
 }
 
-void CppcheckTool::addToQueue(const Utils::FilePaths &files, CppTools::ProjectPart &part)
+void CppcheckTool::addToQueue(const Utils::FilePaths &files, const CppTools::ProjectPart &part)
 {
     const QString key = part.id();
     if (!m_cachedAdditionalArguments.contains(key))
diff --git a/src/plugins/cppcheck/cppchecktool.h b/src/plugins/cppcheck/cppchecktool.h
index c10c2516e2..2951234683 100644
--- a/src/plugins/cppcheck/cppchecktool.h
+++ b/src/plugins/cppcheck/cppchecktool.h
@@ -75,7 +75,7 @@ public:
 
 private:
     void updateArguments();
-    void addToQueue(const Utils::FilePaths &files, CppTools::ProjectPart &part);
+    void addToQueue(const Utils::FilePaths &files, const CppTools::ProjectPart &part);
     QStringList additionalArguments(const CppTools::ProjectPart &part) const;
 
     CppcheckDiagnosticManager &m_manager;
diff --git a/src/plugins/cppcheck/cppchecktrigger.cpp b/src/plugins/cppcheck/cppchecktrigger.cpp
index 93a36596a6..47370c2cd5 100644
--- a/src/plugins/cppcheck/cppchecktrigger.cpp
+++ b/src/plugins/cppcheck/cppchecktrigger.cpp
@@ -76,7 +76,7 @@ void CppcheckTrigger::checkEditors(const QList<Core::IEditor *> &editors)
         return;
 
     using CppModelManager = CppTools::CppModelManager;
-    const CppTools::ProjectInfo::Ptr info
+    const CppTools::ProjectInfo::ConstPtr info
             = CppModelManager::instance()->projectInfo(m_currentProject);
     if (!info)
         return;
diff --git a/src/plugins/cppeditor/cppcodemodelinspectordialog.cpp b/src/plugins/cppeditor/cppcodemodelinspectordialog.cpp
index 3d1126014d..0a49d777f7 100644
--- a/src/plugins/cppeditor/cppcodemodelinspectordialog.cpp
+++ b/src/plugins/cppeditor/cppcodemodelinspectordialog.cpp
@@ -1112,11 +1112,11 @@ class ProjectPartsModel : public QAbstractListModel
 public:
     ProjectPartsModel(QObject *parent);
 
-    void configure(const QList<ProjectInfo::Ptr> &projectInfos,
-                   const ProjectPart::Ptr &currentEditorsProjectPart);
+    void configure(const QList<ProjectInfo::ConstPtr> &projectInfos,
+                   const ProjectPart::ConstPtr &currentEditorsProjectPart);
 
     QModelIndex indexForCurrentEditorsProjectPart() const;
-    ProjectPart::Ptr projectPartForProjectId(const QString &projectPartId) const;
+    ProjectPart::ConstPtr projectPartForProjectId(const QString &projectPartId) const;
 
     enum Columns { PartNameColumn, PartFilePathColumn, ColumnCount };
 
@@ -1126,7 +1126,7 @@ public:
     QVariant headerData(int section, Qt::Orientation orientation, int role) const override;
 
 private:
-    QList<ProjectPart::Ptr> m_projectPartsList;
+    QList<ProjectPart::ConstPtr> m_projectPartsList;
     int m_currentEditorsProjectPartIndex;
 };
 
@@ -1135,13 +1135,13 @@ ProjectPartsModel::ProjectPartsModel(QObject *parent)
 {
 }
 
-void ProjectPartsModel::configure(const QList<ProjectInfo::Ptr> &projectInfos,
-                                  const ProjectPart::Ptr &currentEditorsProjectPart)
+void ProjectPartsModel::configure(const QList<ProjectInfo::ConstPtr> &projectInfos,
+                                  const ProjectPart::ConstPtr &currentEditorsProjectPart)
 {
     emit layoutAboutToBeChanged();
     m_projectPartsList.clear();
-    foreach (const ProjectInfo::Ptr &info, projectInfos) {
-        foreach (const ProjectPart::Ptr &projectPart, info->projectParts()) {
+    foreach (const ProjectInfo::ConstPtr &info, projectInfos) {
+        foreach (const ProjectPart::ConstPtr &projectPart, info->projectParts()) {
             if (!m_projectPartsList.contains(projectPart)) {
                 m_projectPartsList << projectPart;
                 if (projectPart == currentEditorsProjectPart)
@@ -1159,13 +1159,13 @@ QModelIndex ProjectPartsModel::indexForCurrentEditorsProjectPart() const
     return createIndex(m_currentEditorsProjectPartIndex, PartFilePathColumn);
 }
 
-ProjectPart::Ptr ProjectPartsModel::projectPartForProjectId(const QString &projectPartId) const
+ProjectPart::ConstPtr ProjectPartsModel::projectPartForProjectId(const QString &projectPartId) const
 {
-    foreach (const ProjectPart::Ptr &part, m_projectPartsList) {
+    foreach (const ProjectPart::ConstPtr &part, m_projectPartsList) {
         if (part->id() == projectPartId)
             return part;
     }
-    return ProjectPart::Ptr();
+    return ProjectPart::ConstPtr();
 }
 
 int ProjectPartsModel::rowCount(const QModelIndex &/*parent*/) const
@@ -1589,11 +1589,11 @@ void CppCodeModelInspectorDialog::refresh()
     onSnapshotSelected(snapshotIndex);
 
     // Project Parts
-    const ProjectPart::Ptr editorsProjectPart = cppEditorDocument
+    const ProjectPart::ConstPtr editorsProjectPart = cppEditorDocument
         ? cppEditorDocument->processor()->parser()->projectPartInfo().projectPart
-        : ProjectPart::Ptr();
+        : ProjectPart::ConstPtr();
 
-    const QList<ProjectInfo::Ptr> projectInfos = cmmi->projectInfos();
+    const QList<ProjectInfo::ConstPtr> projectInfos = cmmi->projectInfos();
     dumper.dumpProjectInfos(projectInfos);
     m_projectPartsModel->configure(projectInfos, editorsProjectPart);
     m_projectPartsView->resizeColumns(ProjectPartsModel::ColumnCount);
@@ -1778,7 +1778,7 @@ static int defineCount(const ProjectExplorer::Macros &macros)
                    [](const Macro &macro) { return macro.type == ProjectExplorer::MacroType::Define; }));
 }
 
-void CppCodeModelInspectorDialog::updateProjectPartData(const ProjectPart::Ptr &part)
+void CppCodeModelInspectorDialog::updateProjectPartData(const ProjectPart::ConstPtr &part)
 {
     QTC_ASSERT(part, return);
 
diff --git a/src/plugins/cppeditor/cppcodemodelinspectordialog.h b/src/plugins/cppeditor/cppcodemodelinspectordialog.h
index 7faf93da84..310805aba8 100644
--- a/src/plugins/cppeditor/cppcodemodelinspectordialog.h
+++ b/src/plugins/cppeditor/cppcodemodelinspectordialog.h
@@ -88,7 +88,7 @@ private:
     void updateDocumentData(const CPlusPlus::Document::Ptr &document);
 
     void clearProjectPartData();
-    void updateProjectPartData(const CppTools::ProjectPart::Ptr &part);
+    void updateProjectPartData(const CppTools::ProjectPart::ConstPtr &part);
 
     bool event(QEvent *e) override;
 
diff --git a/src/plugins/cppeditor/cppeditorwidget.cpp b/src/plugins/cppeditor/cppeditorwidget.cpp
index ae8fd52db7..45c59fc64b 100644
--- a/src/plugins/cppeditor/cppeditorwidget.cpp
+++ b/src/plugins/cppeditor/cppeditorwidget.cpp
@@ -591,10 +591,10 @@ bool CppEditorWidget::isWidgetHighlighted(QWidget *widget)
 
 namespace {
 
-QList<ProjectPart::Ptr> fetchProjectParts(CppTools::CppModelManager *modelManager,
+QList<ProjectPart::ConstPtr> fetchProjectParts(CppTools::CppModelManager *modelManager,
                                      const Utils::FilePath &filePath)
 {
-    QList<ProjectPart::Ptr> projectParts = modelManager->projectPart(filePath);
+    QList<ProjectPart::ConstPtr> projectParts = modelManager->projectPart(filePath);
 
     if (projectParts.isEmpty())
         projectParts = modelManager->projectPartFromDependencies(filePath);
@@ -604,12 +604,13 @@ QList<ProjectPart::Ptr> fetchProjectParts(CppTools::CppModelManager *modelManage
     return projectParts;
 }
 
-ProjectPart *findProjectPartForCurrentProject(const QList<ProjectPart::Ptr> &projectParts,
-                                              ProjectExplorer::Project *currentProject)
+const ProjectPart *findProjectPartForCurrentProject(
+        const QList<ProjectPart::ConstPtr> &projectParts,
+        ProjectExplorer::Project *currentProject)
 {
     const auto found = std::find_if(projectParts.cbegin(),
                               projectParts.cend(),
-                              [&](const CppTools::ProjectPart::Ptr &projectPart) {
+                              [&](const CppTools::ProjectPart::ConstPtr &projectPart) {
                                   return projectPart->belongsToProject(currentProject);
                               });
 
@@ -621,7 +622,7 @@ ProjectPart *findProjectPartForCurrentProject(const QList<ProjectPart::Ptr> &pro
 
 } // namespace
 
-ProjectPart *CppEditorWidget::projectPart() const
+const ProjectPart *CppEditorWidget::projectPart() const
 {
     if (!d->m_modelManager)
         return nullptr;
@@ -680,7 +681,7 @@ void CppEditorWidget::renameSymbolUnderCursor()
 {
     using ClangBackEnd::SourceLocationsContainer;
 
-    ProjectPart *projPart = projectPart();
+    const ProjectPart *projPart = projectPart();
     if (!projPart)
         return;
 
diff --git a/src/plugins/cppeditor/cppeditorwidget.h b/src/plugins/cppeditor/cppeditorwidget.h
index 7ed46c55ea..85c974a6ca 100644
--- a/src/plugins/cppeditor/cppeditorwidget.h
+++ b/src/plugins/cppeditor/cppeditorwidget.h
@@ -151,7 +151,7 @@ private:
 
     CppTools::FollowSymbolInterface &followSymbolInterface() const;
 
-    CppTools::ProjectPart *projectPart() const;
+    const CppTools::ProjectPart *projectPart() const;
 
 private:
     QScopedPointer<CppEditorWidgetPrivate> d;
diff --git a/src/plugins/cppeditor/cppparsecontext.cpp b/src/plugins/cppeditor/cppparsecontext.cpp
index 521cc49328..d4003b445f 100644
--- a/src/plugins/cppeditor/cppparsecontext.cpp
+++ b/src/plugins/cppeditor/cppparsecontext.cpp
@@ -87,7 +87,7 @@ void ParseContextModel::reset(const CppTools::ProjectPartInfo &projectPartInfo)
 
     // Determine index for current
     const QString id = projectPartInfo.projectPart->id();
-    m_currentIndex = Utils::indexOf(m_projectParts, [id](const CppTools::ProjectPart::Ptr &pp) {
+    m_currentIndex = Utils::indexOf(m_projectParts, [id](const CppTools::ProjectPart::ConstPtr &pp) {
         return pp->id() == id;
     });
     QTC_CHECK(m_currentIndex >= 0);
diff --git a/src/plugins/cppeditor/cppparsecontext.h b/src/plugins/cppeditor/cppparsecontext.h
index 511448bb63..4d470b3770 100644
--- a/src/plugins/cppeditor/cppparsecontext.h
+++ b/src/plugins/cppeditor/cppparsecontext.h
@@ -62,7 +62,7 @@ private:
 
 private:
     CppTools::ProjectPartInfo::Hints m_hints;
-    QList<CppTools::ProjectPart::Ptr> m_projectParts;
+    QList<CppTools::ProjectPart::ConstPtr> m_projectParts;
     int m_currentIndex = -1;
 };
 
diff --git a/src/plugins/cppeditor/cppquickfixes.cpp b/src/plugins/cppeditor/cppquickfixes.cpp
index 60d18cb65c..73e4929c90 100644
--- a/src/plugins/cppeditor/cppquickfixes.cpp
+++ b/src/plugins/cppeditor/cppquickfixes.cpp
@@ -1913,11 +1913,11 @@ ProjectExplorer::HeaderPaths relevantHeaderPaths(const QString &filePath)
     ProjectExplorer::HeaderPaths headerPaths;
 
     CppModelManager *modelManager = CppModelManager::instance();
-    const QList<ProjectPart::Ptr> projectParts = modelManager->projectPart(filePath);
+    const QList<ProjectPart::ConstPtr> projectParts = modelManager->projectPart(filePath);
     if (projectParts.isEmpty()) { // Not part of any project, better use all include paths than none
         headerPaths += modelManager->headerPaths();
     } else {
-        foreach (const ProjectPart::Ptr &part, projectParts)
+        foreach (const ProjectPart::ConstPtr &part, projectParts)
             headerPaths += part->headerPaths;
     }
 
diff --git a/src/plugins/cppeditor/fileandtokenactions_test.cpp b/src/plugins/cppeditor/fileandtokenactions_test.cpp
index 719dc92fe4..1792b756d9 100644
--- a/src/plugins/cppeditor/fileandtokenactions_test.cpp
+++ b/src/plugins/cppeditor/fileandtokenactions_test.cpp
@@ -152,9 +152,9 @@ TestActionsTestCase::TestActionsTestCase(const Actions &tokenActions, const Acti
     // Collect files to process
     QStringList filesToOpen;
     QList<QPointer<ProjectExplorer::Project> > projects;
-    const QList<ProjectInfo::Ptr> projectInfos = m_modelManager->projectInfos();
+    const QList<ProjectInfo::ConstPtr> projectInfos = m_modelManager->projectInfos();
 
-    foreach (const ProjectInfo::Ptr &info, projectInfos) {
+    foreach (const ProjectInfo::ConstPtr &info, projectInfos) {
         qDebug() << "Project" << info->projectFilePath().toUserOutput() << "- files to process:"
                  << info->sourceFiles().size();
         foreach (const QString &sourceFile, info->sourceFiles())
diff --git a/src/plugins/cpptools/builtineditordocumentparser.cpp b/src/plugins/cpptools/builtineditordocumentparser.cpp
index 1d2a187432..ba80d6e241 100644
--- a/src/plugins/cpptools/builtineditordocumentparser.cpp
+++ b/src/plugins/cpptools/builtineditordocumentparser.cpp
@@ -95,7 +95,7 @@ void BuiltinEditorDocumentParser::updateImpl(const QFutureInterface<void> &futur
         state.forceSnapshotInvalidation = false;
     }
 
-    if (const ProjectPart::Ptr part = baseState.projectPartInfo.projectPart) {
+    if (const ProjectPart::ConstPtr part = baseState.projectPartInfo.projectPart) {
         configFile += ProjectExplorer::Macro::toByteArray(part->toolChainMacros);
         configFile += overwrittenToolchainDefines(*part.data());
         configFile += ProjectExplorer::Macro::toByteArray(part->projectMacros);
diff --git a/src/plugins/cpptools/builtinindexingsupport.cpp b/src/plugins/cpptools/builtinindexingsupport.cpp
index d7aebe580d..5baed411bf 100644
--- a/src/plugins/cpptools/builtinindexingsupport.cpp
+++ b/src/plugins/cpptools/builtinindexingsupport.cpp
@@ -211,7 +211,7 @@ void index(QFutureInterface<void> &indexingFuture,
             break;
 
         const QString fileName = files.at(i);
-        const QList<ProjectPart::Ptr> parts = cmm->projectPart(fileName);
+        const QList<ProjectPart::ConstPtr> parts = cmm->projectPart(fileName);
         const CPlusPlus::LanguageFeatures languageFeatures = parts.isEmpty()
                 ? defaultFeatures
                 : parts.first()->languageFeatures;
diff --git a/src/plugins/cpptools/compileroptionsbuilder_test.cpp b/src/plugins/cpptools/compileroptionsbuilder_test.cpp
index 4847237c23..2c26940b09 100644
--- a/src/plugins/cpptools/compileroptionsbuilder_test.cpp
+++ b/src/plugins/cpptools/compileroptionsbuilder_test.cpp
@@ -110,7 +110,7 @@ public:
     Utils::optional<CompilerOptionsBuilder> compilerOptionsBuilder;
 
 private:
-    ProjectPart::Ptr projectPart;
+    ProjectPart::ConstPtr projectPart;
 };
 }
 
diff --git a/src/plugins/cpptools/cppcodemodelinspectordumper.cpp b/src/plugins/cpptools/cppcodemodelinspectordumper.cpp
index 44c968e10b..3f7f23d463 100644
--- a/src/plugins/cpptools/cppcodemodelinspectordumper.cpp
+++ b/src/plugins/cpptools/cppcodemodelinspectordumper.cpp
@@ -410,10 +410,10 @@ QString Utils::toString(ProjectPart::ToolChainWordWidth width)
 
 QString Utils::partsForFile(const QString &fileName)
 {
-    const QList<ProjectPart::Ptr> parts
+    const QList<ProjectPart::ConstPtr> parts
         = CppModelManager::instance()->projectPart(fileName);
     QString result;
-    foreach (const ProjectPart::Ptr &part, parts)
+    foreach (const ProjectPart::ConstPtr &part, parts)
         result += part->displayName + QLatin1Char(',');
     if (result.endsWith(QLatin1Char(',')))
         result.chop(1);
@@ -503,7 +503,7 @@ static void printIncludeType(QTextStream &out, ProjectExplorer::HeaderPathType t
     }
 }
 
-void Dumper::dumpProjectInfos(const QList<ProjectInfo::Ptr> &projectInfos)
+void Dumper::dumpProjectInfos(const QList<ProjectInfo::ConstPtr> &projectInfos)
 {
     const QByteArray i1 = indent(1);
     const QByteArray i2 = indent(2);
@@ -511,12 +511,12 @@ void Dumper::dumpProjectInfos(const QList<ProjectInfo::Ptr> &projectInfos)
     const QByteArray i4 = indent(4);
 
     m_out << "Projects loaded: " << projectInfos.size() << "{{{1\n";
-    foreach (const ProjectInfo::Ptr &info, projectInfos) {
+    foreach (const ProjectInfo::ConstPtr &info, projectInfos) {
         m_out << i1 << "Project " << info->projectName()
               << " (" << info->projectFilePath().toUserOutput() << "){{{2\n";
 
-        const QVector<ProjectPart::Ptr> projectParts = info->projectParts();
-        foreach (const ProjectPart::Ptr &part, projectParts) {
+        const QVector<ProjectPart::ConstPtr> projectParts = info->projectParts();
+        foreach (const ProjectPart::ConstPtr &part, projectParts) {
             QString projectName = QLatin1String("<None>");
             QString projectFilePath = "<None>";
             if (part->hasProject()) {
diff --git a/src/plugins/cpptools/cppcodemodelinspectordumper.h b/src/plugins/cpptools/cppcodemodelinspectordumper.h
index ef48abbfd5..32085f389b 100644
--- a/src/plugins/cpptools/cppcodemodelinspectordumper.h
+++ b/src/plugins/cpptools/cppcodemodelinspectordumper.h
@@ -70,7 +70,7 @@ public:
                     const QString &logFileId = QString());
     ~Dumper();
 
-    void dumpProjectInfos(const QList<CppTools::ProjectInfo::Ptr> &projectInfos);
+    void dumpProjectInfos(const QList<CppTools::ProjectInfo::ConstPtr> &projectInfos);
     void dumpSnapshot(const CPlusPlus::Snapshot &snapshot,
                       const QString &title,
                       bool isGlobalSnapshot = false);
diff --git a/src/plugins/cpptools/cppmodelmanager.cpp b/src/plugins/cpptools/cppmodelmanager.cpp
index d4e347b861..8f67110937 100644
--- a/src/plugins/cpptools/cppmodelmanager.cpp
+++ b/src/plugins/cpptools/cppmodelmanager.cpp
@@ -150,7 +150,7 @@ static CppModelManager *m_instance;
 class ProjectData
 {
 public:
-    ProjectInfo::Ptr projectInfo;
+    ProjectInfo::ConstPtr projectInfo;
     QFutureWatcher<void> *indexer = nullptr;
     bool fullyIndexed = false;
 };
@@ -168,8 +168,9 @@ public:
     // Project integration
     QReadWriteLock m_projectLock;
     QHash<ProjectExplorer::Project *, ProjectData> m_projectData;
-    QMap<Utils::FilePath, QList<ProjectPart::Ptr> > m_fileToProjectParts;
-    QMap<QString, ProjectPart::Ptr> m_projectPartIdToProjectProjectPart;
+    QMap<Utils::FilePath, QList<ProjectPart::ConstPtr> > m_fileToProjectParts;
+    QMap<QString, ProjectPart::ConstPtr> m_projectPartIdToProjectProjectPart;
+
     // The members below are cached/(re)calculated from the projects and/or their project parts
     bool m_dirty;
     QStringList m_projectFiles;
@@ -190,7 +191,7 @@ public:
     bool m_indexerEnabled;
 
     QMutex m_fallbackProjectPartMutex;
-    ProjectPart::Ptr m_fallbackProjectPart;
+    ProjectPart::ConstPtr m_fallbackProjectPart;
 
     CppFindReferences *m_findReferences;
 
@@ -325,7 +326,7 @@ static RefactoringEngineInterface *getRefactoringEngine(CppModelManagerPrivate::
 }
 
 void CppModelManager::startLocalRenaming(const CursorInEditor &data,
-                                         CppTools::ProjectPart *projectPart,
+                                         const CppTools::ProjectPart *projectPart,
                                          RenameCallback &&renameSymbolsCallback)
 {
     RefactoringEngineInterface *engine = getRefactoringEngine(d->m_refactoringEngines);
@@ -761,7 +762,7 @@ QStringList CppModelManager::internalProjectFiles() const
 {
     QStringList files;
     for (const ProjectData &projectData : qAsConst(d->m_projectData)) {
-        for (const ProjectPart::Ptr &part : projectData.projectInfo->projectParts()) {
+        for (const ProjectPart::ConstPtr &part : projectData.projectInfo->projectParts()) {
             for (const ProjectFile &file : part->files)
                 files += file.path;
         }
@@ -774,7 +775,7 @@ ProjectExplorer::HeaderPaths CppModelManager::internalHeaderPaths() const
 {
     ProjectExplorer::HeaderPaths headerPaths;
     for (const ProjectData &projectData: qAsConst(d->m_projectData)) {
-        for (const ProjectPart::Ptr &part : projectData.projectInfo->projectParts()) {
+        for (const ProjectPart::ConstPtr &part : projectData.projectInfo->projectParts()) {
             for (const ProjectExplorer::HeaderPath &path : part->headerPaths) {
                 ProjectExplorer::HeaderPath hp(QDir::cleanPath(path.path), path.type);
                 if (!headerPaths.contains(hp))
@@ -802,7 +803,7 @@ ProjectExplorer::Macros CppModelManager::internalDefinedMacros() const
     ProjectExplorer::Macros macros;
     QSet<ProjectExplorer::Macro> alreadyIn;
     for (const ProjectData &projectData : qAsConst(d->m_projectData)) {
-        for (const ProjectPart::Ptr &part : projectData.projectInfo->projectParts()) {
+        for (const ProjectPart::ConstPtr &part : projectData.projectInfo->projectParts()) {
             addUnique(part->toolChainMacros, macros, alreadyIn);
             addUnique(part->projectMacros, macros, alreadyIn);
         }
@@ -982,14 +983,14 @@ QFuture<void> CppModelManager::updateSourceFiles(const QSet<QString> &sourceFile
     return d->m_internalIndexingSupport->refreshSourceFiles(filteredFiles, mode);
 }
 
-QList<ProjectInfo::Ptr> CppModelManager::projectInfos() const
+QList<ProjectInfo::ConstPtr> CppModelManager::projectInfos() const
 {
     QReadLocker locker(&d->m_projectLock);
-    return Utils::transform<QList<ProjectInfo::Ptr>>(d->m_projectData,
+    return Utils::transform<QList<ProjectInfo::ConstPtr>>(d->m_projectData,
             [](const ProjectData &d) { return d.projectInfo; });
 }
 
-ProjectInfo::Ptr CppModelManager::projectInfo(ProjectExplorer::Project *project) const
+ProjectInfo::ConstPtr CppModelManager::projectInfo(ProjectExplorer::Project *project) const
 {
     QReadLocker locker(&d->m_projectLock);
     return d->m_projectData.value(project).projectInfo;
@@ -999,7 +1000,7 @@ ProjectInfo::Ptr CppModelManager::projectInfo(ProjectExplorer::Project *project)
 void CppModelManager::removeProjectInfoFilesAndIncludesFromSnapshot(const ProjectInfo &projectInfo)
 {
     QMutexLocker snapshotLocker(&d->m_snapshotMutex);
-    foreach (const ProjectPart::Ptr &projectPart, projectInfo.projectParts()) {
+    foreach (const ProjectPart::ConstPtr &projectPart, projectInfo.projectParts()) {
         foreach (const ProjectFile &cxxFile, projectPart->files) {
             foreach (const QString &fileName, d->m_snapshot.allIncludesForDocument(cxxFile.path))
                 d->m_snapshot.remove(fileName);
@@ -1074,11 +1075,11 @@ public:
     }
 
 private:
-    static QSet<QString> projectPartIds(const QVector<ProjectPart::Ptr> &projectParts)
+    static QSet<QString> projectPartIds(const QVector<ProjectPart::ConstPtr> &projectParts)
     {
         QSet<QString> ids;
 
-        foreach (const ProjectPart::Ptr &projectPart, projectParts)
+        foreach (const ProjectPart::ConstPtr &projectPart, projectParts)
             ids.insert(projectPart->id());
 
         return ids;
@@ -1098,7 +1099,7 @@ void CppModelManager::recalculateProjectPartMappings()
     d->m_projectPartIdToProjectProjectPart.clear();
     d->m_fileToProjectParts.clear();
     for (const ProjectData &projectData : qAsConst(d->m_projectData)) {
-        for (const ProjectPart::Ptr &projectPart : projectData.projectInfo->projectParts()) {
+        for (const ProjectPart::ConstPtr &projectPart : projectData.projectInfo->projectParts()) {
             d->m_projectPartIdToProjectProjectPart[projectPart->id()] = projectPart;
             for (const ProjectFile &cxxFile : projectPart->files)
                 d->m_fileToProjectParts[Utils::FilePath::fromString(cxxFile.path)].append(
@@ -1157,7 +1158,7 @@ void CppModelManager::updateCppEditorDocuments(bool projectsUpdated) const
     }
 }
 
-QFuture<void> CppModelManager::updateProjectInfo(const ProjectInfo::Ptr &newProjectInfo,
+QFuture<void> CppModelManager::updateProjectInfo(const ProjectInfo::ConstPtr &newProjectInfo,
                                                  const QSet<QString> &additionalFiles)
 {
     if (!newProjectInfo)
@@ -1181,7 +1182,6 @@ QFuture<void> CppModelManager::updateProjectInfo(const ProjectInfo::Ptr &newProj
         const auto it = d->m_projectData.find(project);
         if (it != d->m_projectData.end() && it->projectInfo && it->fullyIndexed) {
             ProjectInfoComparer comparer(*it->projectInfo, *newProjectInfo);
-
             if (comparer.configurationOrFilesChanged()) {
                 d->m_dirty = true;
 
@@ -1268,22 +1268,22 @@ QFuture<void> CppModelManager::updateProjectInfo(const ProjectInfo::Ptr &newProj
     return indexingFuture;
 }
 
-ProjectPart::Ptr CppModelManager::projectPartForId(const QString &projectPartId) const
+ProjectPart::ConstPtr CppModelManager::projectPartForId(const QString &projectPartId) const
 {
     QReadLocker locker(&d->m_projectLock);
     return d->m_projectPartIdToProjectProjectPart.value(projectPartId);
 }
 
-QList<ProjectPart::Ptr> CppModelManager::projectPart(const Utils::FilePath &fileName) const
+QList<ProjectPart::ConstPtr> CppModelManager::projectPart(const Utils::FilePath &fileName) const
 {
     QReadLocker locker(&d->m_projectLock);
     return d->m_fileToProjectParts.value(fileName);
 }
 
-QList<ProjectPart::Ptr> CppModelManager::projectPartFromDependencies(
+QList<ProjectPart::ConstPtr> CppModelManager::projectPartFromDependencies(
         const Utils::FilePath &fileName) const
 {
-    QSet<ProjectPart::Ptr> parts;
+    QSet<ProjectPart::ConstPtr> parts;
     const Utils::FilePaths deps = snapshot().filesDependingOn(fileName);
 
     QReadLocker locker(&d->m_projectLock);
@@ -1293,7 +1293,7 @@ QList<ProjectPart::Ptr> CppModelManager::projectPartFromDependencies(
     return parts.values();
 }
 
-ProjectPart::Ptr CppModelManager::fallbackProjectPart()
+ProjectPart::ConstPtr CppModelManager::fallbackProjectPart()
 {
     QMutexLocker locker(&d->m_fallbackProjectPartMutex);
     return d->m_fallbackProjectPart;
@@ -1431,7 +1431,7 @@ QSet<QString> CppModelManager::dependingInternalTargets(const Utils::FilePath &f
     const Utils::FilePaths dependingFiles = snapshot.filesDependingOn(
                 wasHeader ? file : Utils::FilePath::fromString(correspondingFile));
     for (const Utils::FilePath &fn : qAsConst(dependingFiles)) {
-        for (const ProjectPart::Ptr &part : projectPart(fn))
+        for (const ProjectPart::ConstPtr &part : projectPart(fn))
             result.insert(part->buildSystemTarget);
     }
     return result;
@@ -1439,12 +1439,12 @@ QSet<QString> CppModelManager::dependingInternalTargets(const Utils::FilePath &f
 
 QSet<QString> CppModelManager::internalTargets(const Utils::FilePath &filePath) const
 {
-    const QList<ProjectPart::Ptr> projectParts = projectPart(filePath);
+    const QList<ProjectPart::ConstPtr> projectParts = projectPart(filePath);
     // if we have no project parts it's most likely a header with declarations only and CMake based
     if (projectParts.isEmpty())
         return dependingInternalTargets(filePath);
     QSet<QString> targets;
-    for (const ProjectPart::Ptr &part : projectParts) {
+    for (const ProjectPart::ConstPtr &part : projectParts) {
         targets.insert(part->buildSystemTarget);
         if (part->buildTargetType != ProjectExplorer::BuildTargetType::Executable)
             targets.unite(dependingInternalTargets(filePath));
diff --git a/src/plugins/cpptools/cppmodelmanager.h b/src/plugins/cpptools/cppmodelmanager.h
index 0af91d702b..302027e049 100644
--- a/src/plugins/cpptools/cppmodelmanager.h
+++ b/src/plugins/cpptools/cppmodelmanager.h
@@ -114,23 +114,23 @@ public:
     QByteArray codeModelConfiguration() const;
     CppLocatorData *locatorData() const;
 
-    QList<ProjectInfo::Ptr> projectInfos() const;
-    ProjectInfo::Ptr projectInfo(ProjectExplorer::Project *project) const;
-    QFuture<void> updateProjectInfo(const ProjectInfo::Ptr &newProjectInfo,
+    QList<ProjectInfo::ConstPtr> projectInfos() const;
+    ProjectInfo::ConstPtr projectInfo(ProjectExplorer::Project *project) const;
+    QFuture<void> updateProjectInfo(const ProjectInfo::ConstPtr &newProjectInfo,
                                     const QSet<QString> &additionalFiles = {});
 
     /// \return The project part with the given project file
-    ProjectPart::Ptr projectPartForId(const QString &projectPartId) const override;
+    ProjectPart::ConstPtr projectPartForId(const QString &projectPartId) const override;
     /// \return All project parts that mention the given file name as one of the sources/headers.
-    QList<ProjectPart::Ptr> projectPart(const Utils::FilePath &fileName) const;
-    QList<ProjectPart::Ptr> projectPart(const QString &fileName) const
+    QList<ProjectPart::ConstPtr> projectPart(const Utils::FilePath &fileName) const;
+    QList<ProjectPart::ConstPtr> projectPart(const QString &fileName) const
     { return projectPart(Utils::FilePath::fromString(fileName)); }
     /// This is a fall-back function: find all files that includes the file directly or indirectly,
     /// and return its \c ProjectPart list for use with this file.
-    QList<ProjectPart::Ptr> projectPartFromDependencies(const Utils::FilePath &fileName) const;
+    QList<ProjectPart::ConstPtr> projectPartFromDependencies(const Utils::FilePath &fileName) const;
     /// \return A synthetic \c ProjectPart which consists of all defines/includes/frameworks from
     ///         all loaded projects.
-    ProjectPart::Ptr fallbackProjectPart();
+    ProjectPart::ConstPtr fallbackProjectPart();
 
     CPlusPlus::Snapshot snapshot() const override;
     Document::Ptr document(const QString &fileName) const;
@@ -158,7 +158,7 @@ public:
     QList<int> references(CPlusPlus::Symbol *symbol, const CPlusPlus::LookupContext &context);
 
     void startLocalRenaming(const CursorInEditor &data,
-                            CppTools::ProjectPart *projectPart,
+                            const ProjectPart *projectPart,
                             RenameCallback &&renameSymbolsCallback) final;
     void globalRename(const CursorInEditor &data, UsagesCallback &&renameCallback,
                       const QString &replacement) final;
diff --git a/src/plugins/cpptools/cppmodelmanager_test.cpp b/src/plugins/cpptools/cppmodelmanager_test.cpp
index 1f3fdfe932..d7203bd414 100644
--- a/src/plugins/cpptools/cppmodelmanager_test.cpp
+++ b/src/plugins/cpptools/cppmodelmanager_test.cpp
@@ -118,7 +118,7 @@ public:
     }
 
     ModelManagerTestHelper *modelManagerTestHelper;
-    ProjectInfo::Ptr projectInfo;
+    ProjectInfo::ConstPtr projectInfo;
     QStringList projectFiles;
 };
 
@@ -164,10 +164,10 @@ private:
     const QString &m_filePath;
 };
 
-ProjectPart::Ptr projectPartOfEditorDocument(const QString &filePath)
+ProjectPart::ConstPtr projectPartOfEditorDocument(const QString &filePath)
 {
     auto *editorDocument = CppModelManager::instance()->cppEditorDocument(filePath);
-    QTC_ASSERT(editorDocument, return ProjectPart::Ptr());
+    QTC_ASSERT(editorDocument, return ProjectPart::ConstPtr());
     return editorDocument->processor()->parser()->projectPartInfo().projectPart;
 }
 
@@ -948,7 +948,7 @@ void ModelManagerTest::testUpdateEditorsAfterProjectUpdate()
     EditorCloser closerA(editorA);
     QCOMPARE(Core::DocumentModel::openedDocuments().size(), 1);
     QVERIFY(TestCase::waitForProcessedEditorDocument(fileA));
-    ProjectPart::Ptr documentAProjectPart = projectPartOfEditorDocument(fileA);
+    ProjectPart::ConstPtr documentAProjectPart = projectPartOfEditorDocument(fileA);
     QVERIFY(!documentAProjectPart->hasProject());
 
     // Open file B in editor
@@ -957,7 +957,7 @@ void ModelManagerTest::testUpdateEditorsAfterProjectUpdate()
     EditorCloser closerB(editorB);
     QCOMPARE(Core::DocumentModel::openedDocuments().size(), 2);
     QVERIFY(TestCase::waitForProcessedEditorDocument(fileB));
-    ProjectPart::Ptr documentBProjectPart = projectPartOfEditorDocument(fileB);
+    ProjectPart::ConstPtr documentBProjectPart = projectPartOfEditorDocument(fileB);
     QVERIFY(!documentBProjectPart->hasProject());
 
     // Switch back to document A
diff --git a/src/plugins/cpptools/cppmodelmanagerinterface.h b/src/plugins/cpptools/cppmodelmanagerinterface.h
index e8f72f7394..4b901b3c74 100644
--- a/src/plugins/cpptools/cppmodelmanagerinterface.h
+++ b/src/plugins/cpptools/cppmodelmanagerinterface.h
@@ -32,7 +32,7 @@ namespace CppTools {
 class CppModelManagerInterface
 {
 public:
-    virtual ProjectPart::Ptr projectPartForId(const QString &projectPartId) const = 0;
+    virtual ProjectPart::ConstPtr projectPartForId(const QString &projectPartId) const = 0;
 
 protected:
     virtual ~CppModelManagerInterface() = default;
diff --git a/src/plugins/cpptools/cppprojectinfogenerator.cpp b/src/plugins/cpptools/cppprojectinfogenerator.cpp
index f81524f102..e241e040d2 100644
--- a/src/plugins/cpptools/cppprojectinfogenerator.cpp
+++ b/src/plugins/cpptools/cppprojectinfogenerator.cpp
@@ -42,21 +42,24 @@ using namespace ProjectExplorer;
 namespace CppTools {
 namespace Internal {
 
-ProjectInfoGenerator::ProjectInfoGenerator(const QFutureInterface<ProjectInfo::Ptr> &futureInterface,
-                                           const ProjectUpdateInfo &projectUpdateInfo)
+ProjectInfoGenerator::ProjectInfoGenerator(
+        const QFutureInterface<ProjectInfo::ConstPtr> &futureInterface,
+        const ProjectUpdateInfo &projectUpdateInfo)
     : m_futureInterface(futureInterface)
     , m_projectUpdateInfo(projectUpdateInfo)
 {
 }
 
-ProjectInfo::Ptr ProjectInfoGenerator::generate()
+ProjectInfo::ConstPtr ProjectInfoGenerator::generate()
 {
-    QVector<ProjectPart::Ptr> projectParts;
+    QVector<ProjectPart::ConstPtr> projectParts;
     for (const RawProjectPart &rpp : m_projectUpdateInfo.rawProjectParts) {
         if (m_futureInterface.isCanceled())
             return {};
-        for (const ProjectPart::Ptr &part : createProjectParts(rpp, m_projectUpdateInfo.projectFilePath))
+        for (const ProjectPart::ConstPtr &part : createProjectParts(
+                 rpp, m_projectUpdateInfo.projectFilePath)) {
             projectParts << part;
+        }
     }
     const auto projectInfo = ProjectInfo::create(m_projectUpdateInfo, projectParts);
 
@@ -78,12 +81,12 @@ ProjectInfo::Ptr ProjectInfoGenerator::generate()
     return projectInfo;
 }
 
-const QVector<ProjectPart::Ptr> ProjectInfoGenerator::createProjectParts(
+const QVector<ProjectPart::ConstPtr> ProjectInfoGenerator::createProjectParts(
     const RawProjectPart &rawProjectPart, const Utils::FilePath &projectFilePath)
 {
     using Utils::LanguageExtension;
 
-    QVector<ProjectPart::Ptr> result;
+    QVector<ProjectPart::ConstPtr> result;
     ProjectFileCategorizer cat(rawProjectPart.displayName,
                                rawProjectPart.files,
                                rawProjectPart.fileIsActive);
@@ -137,7 +140,7 @@ const QVector<ProjectPart::Ptr> ProjectInfoGenerator::createProjectParts(
     return result;
 }
 
-ProjectPart::Ptr ProjectInfoGenerator::createProjectPart(
+ProjectPart::ConstPtr ProjectInfoGenerator::createProjectPart(
         const Utils::FilePath &projectFilePath,
         const RawProjectPart &rawProjectPart,
         const ProjectFiles &projectFiles,
diff --git a/src/plugins/cpptools/cppprojectinfogenerator.h b/src/plugins/cpptools/cppprojectinfogenerator.h
index 64fc60c238..3fd132ef90 100644
--- a/src/plugins/cpptools/cppprojectinfogenerator.h
+++ b/src/plugins/cpptools/cppprojectinfogenerator.h
@@ -36,14 +36,16 @@ namespace Internal {
 class ProjectInfoGenerator
 {
 public:
-    ProjectInfoGenerator(const QFutureInterface<ProjectInfo::Ptr> &futureInterface,
+    ProjectInfoGenerator(const QFutureInterface<ProjectInfo::ConstPtr> &futureInterface,
                          const ProjectExplorer::ProjectUpdateInfo &projectUpdateInfo);
 
-    ProjectInfo::Ptr generate();
+    ProjectInfo::ConstPtr generate();
 
 private:
-    const QVector<ProjectPart::Ptr> createProjectParts(const ProjectExplorer::RawProjectPart &rawProjectPart, const Utils::FilePath &projectFilePath);
-    ProjectPart::Ptr createProjectPart(const Utils::FilePath &projectFilePath,
+    const QVector<ProjectPart::ConstPtr> createProjectParts(
+            const ProjectExplorer::RawProjectPart &rawProjectPart,
+            const Utils::FilePath &projectFilePath);
+    ProjectPart::ConstPtr createProjectPart(const Utils::FilePath &projectFilePath,
                                        const ProjectExplorer::RawProjectPart &rawProjectPart,
                                        const ProjectFiles &projectFiles,
                                        const QString &partName,
@@ -51,7 +53,7 @@ private:
                                        Utils::LanguageExtensions languageExtensions);
 
 private:
-    const QFutureInterface<ProjectInfo::Ptr> m_futureInterface;
+    const QFutureInterface<ProjectInfo::ConstPtr> m_futureInterface;
     const ProjectExplorer::ProjectUpdateInfo &m_projectUpdateInfo;
     bool m_cToolchainMissing = false;
     bool m_cxxToolchainMissing = false;
diff --git a/src/plugins/cpptools/cppprojectpartchooser.cpp b/src/plugins/cpptools/cppprojectpartchooser.cpp
index 03a540ea32..671fd94749 100644
--- a/src/plugins/cpptools/cppprojectpartchooser.cpp
+++ b/src/plugins/cpptools/cppprojectpartchooser.cpp
@@ -36,14 +36,14 @@ class ProjectPartPrioritizer
 public:
     struct PrioritizedProjectPart
     {
-        PrioritizedProjectPart(const ProjectPart::Ptr &projectPart, int priority)
+        PrioritizedProjectPart(const ProjectPart::ConstPtr &projectPart, int priority)
             : projectPart(projectPart), priority(priority) {}
 
-        ProjectPart::Ptr projectPart;
+        ProjectPart::ConstPtr projectPart;
         int priority = 0;
     };
 
-    ProjectPartPrioritizer(const QList<ProjectPart::Ptr> &projectParts,
+    ProjectPartPrioritizer(const QList<ProjectPart::ConstPtr> &projectParts,
                            const QString &preferredProjectPartId,
                            const ProjectExplorer::Project *activeProject,
                            Language languagePreference,
@@ -77,11 +77,11 @@ public:
     }
 
 private:
-    QList<PrioritizedProjectPart> prioritize(const QList<ProjectPart::Ptr> &projectParts) const
+    QList<PrioritizedProjectPart> prioritize(const QList<ProjectPart::ConstPtr> &projectParts) const
     {
         // Prioritize
         QList<PrioritizedProjectPart> prioritized = Utils::transform(projectParts,
-                                                        [&](const ProjectPart::Ptr &projectPart) {
+                                                        [&](const ProjectPart::ConstPtr &projectPart) {
             return PrioritizedProjectPart{projectPart, priority(*projectPart)};
         });
 
@@ -143,8 +143,8 @@ ProjectPartInfo ProjectPartChooser::choose(
     QTC_CHECK(m_projectPartsFromDependenciesForFile);
     QTC_CHECK(m_fallbackProjectPart);
 
-    ProjectPart::Ptr projectPart = currentProjectPartInfo.projectPart;
-    QList<ProjectPart::Ptr> projectParts = m_projectPartsForFile(filePath);
+    ProjectPart::ConstPtr projectPart = currentProjectPartInfo.projectPart;
+    QList<ProjectPart::ConstPtr> projectParts = m_projectPartsForFile(filePath);
     bool areProjectPartsFromDependencies = false;
 
     if (projectParts.isEmpty()) {
diff --git a/src/plugins/cpptools/cppprojectpartchooser.h b/src/plugins/cpptools/cppprojectpartchooser.h
index 62035ce8b6..9a97be724c 100644
--- a/src/plugins/cpptools/cppprojectpartchooser.h
+++ b/src/plugins/cpptools/cppprojectpartchooser.h
@@ -38,10 +38,10 @@ namespace Internal {
 class ProjectPartChooser
 {
 public:
-    using FallBackProjectPart = std::function<ProjectPart::Ptr()>;
-    using ProjectPartsForFile = std::function<QList<ProjectPart::Ptr>(const QString &filePath)>;
+    using FallBackProjectPart = std::function<ProjectPart::ConstPtr()>;
+    using ProjectPartsForFile = std::function<QList<ProjectPart::ConstPtr>(const QString &filePath)>;
     using ProjectPartsFromDependenciesForFile
-        = std::function<QList<ProjectPart::Ptr>(const QString &filePath)>;
+        = std::function<QList<ProjectPart::ConstPtr>(const QString &filePath)>;
 
 public:
     void setFallbackProjectPart(const FallBackProjectPart &getter);
diff --git a/src/plugins/cpptools/cppprojectupdater.cpp b/src/plugins/cpptools/cppprojectupdater.cpp
index 9b48335951..957f24b98e 100644
--- a/src/plugins/cpptools/cppprojectupdater.cpp
+++ b/src/plugins/cpptools/cppprojectupdater.cpp
@@ -77,7 +77,7 @@ void CppProjectUpdater::update(const ProjectUpdateInfo &projectUpdateInfo,
     using namespace ProjectExplorer;
 
     // Run the project info generator in a worker thread and continue if that one is finished.
-    auto generateFuture = Utils::runAsync([=](QFutureInterface<ProjectInfo::Ptr> &futureInterface) {
+    auto generateFuture = Utils::runAsync([=](QFutureInterface<ProjectInfo::ConstPtr> &futureInterface) {
         ProjectUpdateInfo fullProjectUpdateInfo = projectUpdateInfo;
         if (fullProjectUpdateInfo.rppGenerator)
             fullProjectUpdateInfo.rawProjectParts = fullProjectUpdateInfo.rppGenerator();
diff --git a/src/plugins/cpptools/cppprojectupdater.h b/src/plugins/cpptools/cppprojectupdater.h
index a76122d4b4..7d7de119e6 100644
--- a/src/plugins/cpptools/cppprojectupdater.h
+++ b/src/plugins/cpptools/cppprojectupdater.h
@@ -70,7 +70,7 @@ private:
     ProjectExplorer::ProjectUpdateInfo m_projectUpdateInfo;
     QList<QPointer<ProjectExplorer::ExtraCompiler>> m_extraCompilers;
 
-    QFutureWatcher<ProjectInfo::Ptr> m_generateFutureWatcher;
+    QFutureWatcher<ProjectInfo::ConstPtr> m_generateFutureWatcher;
     bool m_isProjectInfoGenerated = false;
     QSet<QFutureWatcher<void> *> m_extraCompilersFutureWatchers;
     std::unique_ptr<QFutureInterface<void>> m_projectUpdateFutureInterface;
diff --git a/src/plugins/cpptools/cpprefactoringengine.cpp b/src/plugins/cpptools/cpprefactoringengine.cpp
index 94d2871c36..38f997f539 100644
--- a/src/plugins/cpptools/cpprefactoringengine.cpp
+++ b/src/plugins/cpptools/cpprefactoringengine.cpp
@@ -38,7 +38,7 @@
 namespace CppTools {
 
 void CppRefactoringEngine::startLocalRenaming(const CursorInEditor &data,
-                                              ProjectPart *,
+                                              const ProjectPart *,
                                               RenameCallback &&renameSymbolsCallback)
 {
     CppEditorWidgetInterface *editorWidget = data.editorWidget();
diff --git a/src/plugins/cpptools/cpprefactoringengine.h b/src/plugins/cpptools/cpprefactoringengine.h
index 17b24062f7..3c411009e4 100644
--- a/src/plugins/cpptools/cpprefactoringengine.h
+++ b/src/plugins/cpptools/cpprefactoringengine.h
@@ -33,7 +33,7 @@ class CPPTOOLS_EXPORT CppRefactoringEngine : public RefactoringEngineInterface
 {
 public:
     void startLocalRenaming(const CursorInEditor &data,
-                            ProjectPart *projectPart,
+                            const ProjectPart *projectPart,
                             RenameCallback &&renameSymbolsCallback) override;
     void globalRename(const CursorInEditor &data, UsagesCallback &&,
                       const QString &replacement) override;
diff --git a/src/plugins/cpptools/cpptools_utils.h b/src/plugins/cpptools/cpptools_utils.h
index f6efb65ef2..73b4497ed7 100644
--- a/src/plugins/cpptools/cpptools_utils.h
+++ b/src/plugins/cpptools/cpptools_utils.h
@@ -44,8 +44,8 @@ public:
     Q_DECLARE_FLAGS(Hints, Hint)
 
     ProjectPartInfo() = default;
-    ProjectPartInfo(const ProjectPart::Ptr &projectPart,
-                    const QList<ProjectPart::Ptr> &projectParts,
+    ProjectPartInfo(const ProjectPart::ConstPtr &projectPart,
+                    const QList<ProjectPart::ConstPtr> &projectParts,
                     Hints hints)
         : projectPart(projectPart)
         , projectParts(projectParts)
@@ -54,8 +54,8 @@ public:
     }
 
 public:
-    ProjectPart::Ptr projectPart;
-    QList<ProjectPart::Ptr> projectParts; // The one above as first plus alternatives.
+    ProjectPart::ConstPtr projectPart;
+    QList<ProjectPart::ConstPtr> projectParts; // The one above as first plus alternatives.
     Hints hints = NoHint;
 };
 
diff --git a/src/plugins/cpptools/cpptoolsbridgeqtcreatorimplementation.cpp b/src/plugins/cpptools/cpptoolsbridgeqtcreatorimplementation.cpp
index 5919cc4b17..1524844d26 100644
--- a/src/plugins/cpptools/cpptoolsbridgeqtcreatorimplementation.cpp
+++ b/src/plugins/cpptools/cpptoolsbridgeqtcreatorimplementation.cpp
@@ -44,15 +44,15 @@ CppToolsBridgeQtCreatorImplementation::cppEditorDocument(const QString &filePath
 
 namespace {
 
-CppTools::ProjectPart::Ptr projectPartForFile(const QString &filePath)
+CppTools::ProjectPart::ConstPtr projectPartForFile(const QString &filePath)
 {
     if (const auto parser = BaseEditorDocumentParser::get(filePath))
         return parser->projectPartInfo().projectPart;
 
-    return CppTools::ProjectPart::Ptr();
+    return CppTools::ProjectPart::ConstPtr();
 }
 
-bool isProjectPartValid(const CppTools::ProjectPart::Ptr projectPart)
+bool isProjectPartValid(const CppTools::ProjectPart::ConstPtr projectPart)
 {
     if (projectPart)
         return !CppTools::CppModelManager::instance()->projectPartForId(projectPart->id()).isNull();
@@ -64,7 +64,7 @@ bool isProjectPartValid(const CppTools::ProjectPart::Ptr projectPart)
 
 QString CppToolsBridgeQtCreatorImplementation::projectPartIdForFile(const QString &filePath) const
 {
-    const CppTools::ProjectPart::Ptr projectPart = projectPartForFile(filePath);
+    const CppTools::ProjectPart::ConstPtr projectPart = projectPartForFile(filePath);
 
     if (isProjectPartValid(projectPart))
         return projectPart->id(); // OK, Project Part is still loaded
diff --git a/src/plugins/cpptools/cpptoolsplugin.cpp b/src/plugins/cpptools/cpptoolsplugin.cpp
index 7eb0c916ee..7418f946fe 100644
--- a/src/plugins/cpptools/cpptoolsplugin.cpp
+++ b/src/plugins/cpptools/cpptoolsplugin.cpp
@@ -514,8 +514,8 @@ QString correspondingHeaderOrSource(const QString &fileName, bool *wasHeader, Ca
     // Find files in other projects
     } else {
         CppModelManager *modelManager = CppModelManager::instance();
-        const QList<ProjectInfo::Ptr> projectInfos = modelManager->projectInfos();
-        for (const ProjectInfo::Ptr &projectInfo : projectInfos) {
+        const QList<ProjectInfo::ConstPtr> projectInfos = modelManager->projectInfos();
+        for (const ProjectInfo::ConstPtr &projectInfo : projectInfos) {
             const Project *project = projectForProjectInfo(*projectInfo);
             if (project == currentProject)
                 continue; // We have already checked the current project.
diff --git a/src/plugins/cpptools/cpptoolstestcase.cpp b/src/plugins/cpptools/cpptoolstestcase.cpp
index fca2d11eed..9ba361b4ff 100644
--- a/src/plugins/cpptools/cpptoolstestcase.cpp
+++ b/src/plugins/cpptools/cpptoolstestcase.cpp
@@ -278,7 +278,7 @@ ProjectOpenerAndCloser::~ProjectOpenerAndCloser()
         QCoreApplication::processEvents();
 }
 
-ProjectInfo::Ptr ProjectOpenerAndCloser::open(const QString &projectFile,
+ProjectInfo::ConstPtr ProjectOpenerAndCloser::open(const QString &projectFile,
         bool configureAsExampleProject, Kit *kit)
 {
     ProjectExplorerPlugin::OpenProjectResult result =
diff --git a/src/plugins/cpptools/cpptoolstestcase.h b/src/plugins/cpptools/cpptoolstestcase.h
index 7919f3c921..36def0a469 100644
--- a/src/plugins/cpptools/cpptoolstestcase.h
+++ b/src/plugins/cpptools/cpptoolstestcase.h
@@ -141,8 +141,10 @@ public:
     ProjectOpenerAndCloser();
     ~ProjectOpenerAndCloser(); // Closes opened projects
 
-    CppTools::ProjectInfo::Ptr open(const QString &projectFile, bool configureAsExampleProject = false,
-                     ProjectExplorer::Kit *kit = nullptr);
+    CppTools::ProjectInfo::ConstPtr open(
+            const QString &projectFile,
+            bool configureAsExampleProject = false,
+            ProjectExplorer::Kit *kit = nullptr);
 
 private:
     QList<ProjectExplorer::Project *> m_openProjects;
diff --git a/src/plugins/cpptools/modelmanagertesthelper.cpp b/src/plugins/cpptools/modelmanagertesthelper.cpp
index b80ce25564..59f1e17e45 100644
--- a/src/plugins/cpptools/modelmanagertesthelper.cpp
+++ b/src/plugins/cpptools/modelmanagertesthelper.cpp
@@ -77,7 +77,7 @@ ModelManagerTestHelper::~ModelManagerTestHelper()
 void ModelManagerTestHelper::cleanup()
 {
     CppModelManager *mm = CppModelManager::instance();
-    QList<ProjectInfo::Ptr> pies = mm->projectInfos();
+    QList<ProjectInfo::ConstPtr> pies = mm->projectInfos();
     for (Project * const p : qAsConst(m_projects)) {
         ProjectExplorer::SessionManager::removeProject(p);
         emit aboutToRemoveProject(p);
@@ -98,7 +98,7 @@ ModelManagerTestHelper::Project *ModelManagerTestHelper::createProject(
 }
 
 QSet<QString> ModelManagerTestHelper::updateProjectInfo(
-        const CppTools::ProjectInfo::Ptr &projectInfo)
+        const CppTools::ProjectInfo::ConstPtr &projectInfo)
 {
     resetRefreshedSourceFiles();
     CppModelManager::instance()->updateProjectInfo(projectInfo).waitForFinished();
diff --git a/src/plugins/cpptools/modelmanagertesthelper.h b/src/plugins/cpptools/modelmanagertesthelper.h
index e5ee32cca8..8066d1eccf 100644
--- a/src/plugins/cpptools/modelmanagertesthelper.h
+++ b/src/plugins/cpptools/modelmanagertesthelper.h
@@ -63,7 +63,7 @@ public:
 
     Project *createProject(const QString &name, const Utils::FilePath &filePath = {});
 
-    QSet<QString> updateProjectInfo(const ProjectInfo::Ptr &projectInfo);
+    QSet<QString> updateProjectInfo(const ProjectInfo::ConstPtr &projectInfo);
 
     void resetRefreshedSourceFiles();
     QSet<QString> waitForRefreshedSourceFiles();
diff --git a/src/plugins/cpptools/projectinfo.cpp b/src/plugins/cpptools/projectinfo.cpp
index 2125862be4..9c385773d0 100644
--- a/src/plugins/cpptools/projectinfo.cpp
+++ b/src/plugins/cpptools/projectinfo.cpp
@@ -33,13 +33,13 @@
 
 namespace CppTools {
 
-ProjectInfo::Ptr ProjectInfo::create(const ProjectExplorer::ProjectUpdateInfo &updateInfo,
-                                     const QVector<ProjectPart::Ptr> &projectParts)
+ProjectInfo::ConstPtr ProjectInfo::create(const ProjectExplorer::ProjectUpdateInfo &updateInfo,
+                                     const QVector<ProjectPart::ConstPtr> &projectParts)
 {
-    return Ptr(new ProjectInfo(updateInfo, projectParts));
+    return ConstPtr(new ProjectInfo(updateInfo, projectParts));
 }
 
-const QVector<ProjectPart::Ptr> ProjectInfo::projectParts() const
+const QVector<ProjectPart::ConstPtr> ProjectInfo::projectParts() const
 {
     return m_projectParts;
 }
@@ -80,30 +80,31 @@ bool ProjectInfo::configurationOrFilesChanged(const ProjectInfo &other) const
     return configurationChanged(other) || m_sourceFiles != other.m_sourceFiles;
 }
 
-static QSet<QString> getSourceFiles(const QVector<ProjectPart::Ptr> &projectParts)
+static QSet<QString> getSourceFiles(const QVector<ProjectPart::ConstPtr> &projectParts)
 {
     QSet<QString> sourceFiles;
-    for (const ProjectPart::Ptr &part : projectParts) {
+    for (const ProjectPart::ConstPtr &part : projectParts) {
         for (const ProjectFile &file : qAsConst(part->files))
             sourceFiles.insert(file.path);
     }
     return sourceFiles;
 }
 
-static ProjectExplorer::Macros getDefines(const QVector<ProjectPart::Ptr> &projectParts)
+static ProjectExplorer::Macros getDefines(const QVector<ProjectPart::ConstPtr> &projectParts)
 {
     ProjectExplorer::Macros defines;
-    for (const ProjectPart::Ptr &part : projectParts) {
+    for (const ProjectPart::ConstPtr &part : projectParts) {
         defines.append(part->toolChainMacros);
         defines.append(part->projectMacros);
     }
     return defines;
 }
 
-static ProjectExplorer::HeaderPaths getHeaderPaths(const QVector<ProjectPart::Ptr> &projectParts)
+static ProjectExplorer::HeaderPaths getHeaderPaths(
+        const QVector<ProjectPart::ConstPtr> &projectParts)
 {
     QSet<ProjectExplorer::HeaderPath> uniqueHeaderPaths;
-    for (const ProjectPart::Ptr &part : projectParts) {
+    for (const ProjectPart::ConstPtr &part : projectParts) {
         for (const ProjectExplorer::HeaderPath &headerPath : qAsConst(part->headerPaths))
             uniqueHeaderPaths.insert(headerPath);
     }
@@ -111,7 +112,7 @@ static ProjectExplorer::HeaderPaths getHeaderPaths(const QVector<ProjectPart::Pt
 }
 
 ProjectInfo::ProjectInfo(const ProjectExplorer::ProjectUpdateInfo &updateInfo,
-                         const QVector<ProjectPart::Ptr> &projectParts)
+                         const QVector<ProjectPart::ConstPtr> &projectParts)
     : m_projectParts(projectParts),
       m_projectName(updateInfo.projectName),
       m_projectFilePath(updateInfo.projectFilePath),
diff --git a/src/plugins/cpptools/projectinfo.h b/src/plugins/cpptools/projectinfo.h
index bf73bd71bb..0d255c5a3f 100644
--- a/src/plugins/cpptools/projectinfo.h
+++ b/src/plugins/cpptools/projectinfo.h
@@ -45,11 +45,11 @@ namespace CppTools {
 class CPPTOOLS_EXPORT ProjectInfo
 {
 public:
-    using Ptr = std::shared_ptr<ProjectInfo>;
-    static Ptr create(const ProjectExplorer::ProjectUpdateInfo &updateInfo,
-                      const QVector<ProjectPart::Ptr> &projectParts);
+    using ConstPtr = std::shared_ptr<const ProjectInfo>;
+    static ConstPtr create(const ProjectExplorer::ProjectUpdateInfo &updateInfo,
+                           const QVector<ProjectPart::ConstPtr> &projectParts);
 
-    const QVector<ProjectPart::Ptr> projectParts() const;
+    const QVector<ProjectPart::ConstPtr> projectParts() const;
     const QSet<QString> sourceFiles() const;
     QString projectName() const { return m_projectName; }
     Utils::FilePath projectFilePath() const { return m_projectFilePath; }
@@ -65,9 +65,9 @@ public:
 
 private:
     ProjectInfo(const ProjectExplorer::ProjectUpdateInfo &updateInfo,
-                const QVector<ProjectPart::Ptr> &projectParts);
+                const QVector<ProjectPart::ConstPtr> &projectParts);
 
-    const QVector<ProjectPart::Ptr> m_projectParts;
+    const QVector<ProjectPart::ConstPtr> m_projectParts;
     const QString m_projectName;
     const Utils::FilePath m_projectFilePath;
     const Utils::FilePath m_buildRoot;
diff --git a/src/plugins/cpptools/projectinfo_test.cpp b/src/plugins/cpptools/projectinfo_test.cpp
index fb24554684..48abfc3c58 100644
--- a/src/plugins/cpptools/projectinfo_test.cpp
+++ b/src/plugins/cpptools/projectinfo_test.cpp
@@ -66,9 +66,9 @@ public:
                               languagePreference, projectsChanged);
     }
 
-    static QList<ProjectPart::Ptr> createProjectPartsWithDifferentProjects()
+    static QList<ProjectPart::ConstPtr> createProjectPartsWithDifferentProjects()
     {
-        QList<ProjectPart::Ptr> projectParts;
+        QList<ProjectPart::ConstPtr> projectParts;
 
         const auto p1 = std::make_shared<Project>(
                     QString(), Utils::FilePath::fromString("p1.pro"));
@@ -82,16 +82,16 @@ public:
         return projectParts;
     }
 
-    static QList<ProjectPart::Ptr> createCAndCxxProjectParts()
+    static QList<ProjectPart::ConstPtr> createCAndCxxProjectParts()
     {
-        QList<ProjectPart::Ptr> projectParts;
+        QList<ProjectPart::ConstPtr> projectParts;
         ToolChainInfo tcInfo;
 
         // Create project part for C
         tcInfo.macroInspectionRunner = [](const QStringList &) {
             return ToolChain::MacroInspectionReport{{}, Utils::LanguageVersion::C11};
         };
-        const ProjectPart::Ptr cprojectpart = ProjectPart::create({}, {}, {}, {}, {}, {}, {},
+        const ProjectPart::ConstPtr cprojectpart = ProjectPart::create({}, {}, {}, {}, {}, {}, {},
                                                                   tcInfo);
         projectParts.append(cprojectpart);
 
@@ -99,7 +99,7 @@ public:
         tcInfo.macroInspectionRunner = [](const QStringList &) {
             return ToolChain::MacroInspectionReport{{}, Utils::LanguageVersion::CXX98};
         };
-        const ProjectPart::Ptr cxxprojectpart = ProjectPart::create({}, {}, {}, {}, {}, {}, {},
+        const ProjectPart::ConstPtr cxxprojectpart = ProjectPart::create({}, {}, {}, {}, {}, {}, {},
                                                                     tcInfo);
         projectParts.append(cxxprojectpart);
 
@@ -107,7 +107,7 @@ public:
     }
 
     QString filePath;
-    ProjectPart::Ptr currentProjectPart = ProjectPart::create({});
+    ProjectPart::ConstPtr currentProjectPart = ProjectPart::create({});
     ProjectPartInfo currentProjectPartInfo{currentProjectPart,
                                            {currentProjectPart},
                                            ProjectPartInfo::NoHint};
@@ -117,9 +117,9 @@ public:
     bool projectsChanged = false;
     ProjectPartChooser chooser;
 
-    QList<ProjectPart::Ptr> projectPartsForFile;
-    QList<ProjectPart::Ptr> projectPartsFromDependenciesForFile;
-    ProjectPart::Ptr fallbackProjectPart;
+    QList<ProjectPart::ConstPtr> projectPartsForFile;
+    QList<ProjectPart::ConstPtr> projectPartsFromDependenciesForFile;
+    ProjectPart::ConstPtr fallbackProjectPart;
 
     static QHash<Utils::FilePath, std::shared_ptr<Project>> projectMap;
 };
@@ -130,10 +130,10 @@ ProjectPartChooserTestHelper::projectMap;
 
 void ProjectPartChooserTest::testChooseManuallySet()
 {
-    ProjectPart::Ptr p1 = ProjectPart::create({});
+    ProjectPart::ConstPtr p1 = ProjectPart::create({});
     RawProjectPart rpp2;
     rpp2.setProjectFileLocation("someId");
-    ProjectPart::Ptr p2 = ProjectPart::create({}, rpp2);
+    ProjectPart::ConstPtr p2 = ProjectPart::create({}, rpp2);
     ProjectPartChooserTestHelper t;
     t.preferredProjectPartId = p2->projectFile;
     t.projectPartsForFile += {p1, p2};
@@ -143,10 +143,10 @@ void ProjectPartChooserTest::testChooseManuallySet()
 
 void ProjectPartChooserTest::testIndicateManuallySet()
 {
-    ProjectPart::Ptr p1 = ProjectPart::create({});
+    ProjectPart::ConstPtr p1 = ProjectPart::create({});
     RawProjectPart rpp2;
     rpp2.setProjectFileLocation("someId");
-    ProjectPart::Ptr p2 = ProjectPart::create({}, rpp2);
+    ProjectPart::ConstPtr p2 = ProjectPart::create({}, rpp2);
     ProjectPartChooserTestHelper t;
     t.preferredProjectPartId = p2->projectFile;
     t.projectPartsForFile += {p1, p2};
@@ -156,10 +156,10 @@ void ProjectPartChooserTest::testIndicateManuallySet()
 
 void ProjectPartChooserTest::testIndicateManuallySetForFallbackToProjectPartFromDependencies()
 {
-    ProjectPart::Ptr p1 = ProjectPart::create({});
+    ProjectPart::ConstPtr p1 = ProjectPart::create({});
     RawProjectPart rpp2;
     rpp2.setProjectFileLocation("someId");
-    ProjectPart::Ptr p2 = ProjectPart::create({}, rpp2);
+    ProjectPart::ConstPtr p2 = ProjectPart::create({}, rpp2);
     ProjectPartChooserTestHelper t;
     t.preferredProjectPartId = p2->projectFile;
     t.projectPartsFromDependenciesForFile += {p1, p2};
@@ -175,8 +175,8 @@ void ProjectPartChooserTest::testDoNotIndicateNotManuallySet()
 void ProjectPartChooserTest::testForMultipleChooseFromActiveProject()
 {
     ProjectPartChooserTestHelper t;
-    const QList<ProjectPart::Ptr> projectParts = t.createProjectPartsWithDifferentProjects();
-    const ProjectPart::Ptr secondProjectPart = projectParts.at(1);
+    const QList<ProjectPart::ConstPtr> projectParts = t.createProjectPartsWithDifferentProjects();
+    const ProjectPart::ConstPtr secondProjectPart = projectParts.at(1);
     t.projectPartsForFile += projectParts;
     t.activeProject = secondProjectPart->topLevelProject;
 
@@ -189,8 +189,8 @@ void ProjectPartChooserTest::testForMultiplePreferSelectedForBuilding()
     rpp1.setSelectedForBuilding(false);
     RawProjectPart rpp2;
     rpp2.setSelectedForBuilding(true);
-    const ProjectPart::Ptr firstProjectPart = ProjectPart::create({}, rpp1);
-    const ProjectPart::Ptr secondProjectPart = ProjectPart::create({}, rpp2);
+    const ProjectPart::ConstPtr firstProjectPart = ProjectPart::create({}, rpp1);
+    const ProjectPart::ConstPtr secondProjectPart = ProjectPart::create({}, rpp2);
     ProjectPartChooserTestHelper t;
     t.projectPartsForFile += firstProjectPart;
     t.projectPartsForFile += secondProjectPart;
@@ -201,8 +201,8 @@ void ProjectPartChooserTest::testForMultiplePreferSelectedForBuilding()
 void ProjectPartChooserTest::testForMultipleFromDependenciesChooseFromActiveProject()
 {
     ProjectPartChooserTestHelper t;
-    const QList<ProjectPart::Ptr> projectParts = t.createProjectPartsWithDifferentProjects();
-    const ProjectPart::Ptr secondProjectPart = projectParts.at(1);
+    const QList<ProjectPart::ConstPtr> projectParts = t.createProjectPartsWithDifferentProjects();
+    const ProjectPart::ConstPtr secondProjectPart = projectParts.at(1);
     t.projectPartsFromDependenciesForFile += projectParts;
     t.activeProject = secondProjectPart->topLevelProject;
 
@@ -212,9 +212,9 @@ void ProjectPartChooserTest::testForMultipleFromDependenciesChooseFromActiveProj
 void ProjectPartChooserTest::testForMultipleCheckIfActiveProjectChanged()
 {
     ProjectPartChooserTestHelper t;
-    const QList<ProjectPart::Ptr> projectParts = t.createProjectPartsWithDifferentProjects();
-    const ProjectPart::Ptr firstProjectPart = projectParts.at(0);
-    const ProjectPart::Ptr secondProjectPart = projectParts.at(1);
+    const QList<ProjectPart::ConstPtr> projectParts = t.createProjectPartsWithDifferentProjects();
+    const ProjectPart::ConstPtr firstProjectPart = projectParts.at(0);
+    const ProjectPart::ConstPtr secondProjectPart = projectParts.at(1);
     t.projectPartsForFile += projectParts;
     t.currentProjectPartInfo.projectPart = firstProjectPart;
     t.activeProject = secondProjectPart->topLevelProject;
@@ -227,7 +227,7 @@ void ProjectPartChooserTest::testForMultipleAndAmbigiousHeaderPreferCProjectPart
     ProjectPartChooserTestHelper t;
     t.languagePreference = Language::C;
     t.projectPartsForFile = t.createCAndCxxProjectParts();
-    const ProjectPart::Ptr cProjectPart = t.projectPartsForFile.at(0);
+    const ProjectPart::ConstPtr cProjectPart = t.projectPartsForFile.at(0);
 
     QCOMPARE(t.choose().projectPart, cProjectPart);
 }
@@ -237,15 +237,15 @@ void ProjectPartChooserTest::testForMultipleAndAmbigiousHeaderPreferCxxProjectPa
     ProjectPartChooserTestHelper t;
     t.languagePreference = Language::Cxx;
     t.projectPartsForFile = t.createCAndCxxProjectParts();
-    const ProjectPart::Ptr cxxProjectPart = t.projectPartsForFile.at(1);
+    const ProjectPart::ConstPtr cxxProjectPart = t.projectPartsForFile.at(1);
 
     QCOMPARE(t.choose().projectPart, cxxProjectPart);
 }
 
 void ProjectPartChooserTest::testIndicateMultiple()
 {
-    const ProjectPart::Ptr p1 = ProjectPart::create({});
-    const ProjectPart::Ptr p2 = ProjectPart::create({});
+    const ProjectPart::ConstPtr p1 = ProjectPart::create({});
+    const ProjectPart::ConstPtr p2 = ProjectPart::create({});
     ProjectPartChooserTestHelper t;
     t.projectPartsForFile += {p1, p2};
 
@@ -254,8 +254,8 @@ void ProjectPartChooserTest::testIndicateMultiple()
 
 void ProjectPartChooserTest::testIndicateMultipleForFallbackToProjectPartFromDependencies()
 {
-    const ProjectPart::Ptr p1 = ProjectPart::create({});
-    const ProjectPart::Ptr p2 = ProjectPart::create({});
+    const ProjectPart::ConstPtr p1 = ProjectPart::create({});
+    const ProjectPart::ConstPtr p2 = ProjectPart::create({});
     ProjectPartChooserTestHelper t;
     t.projectPartsFromDependenciesForFile += {p1, p2};
 
@@ -264,7 +264,7 @@ void ProjectPartChooserTest::testIndicateMultipleForFallbackToProjectPartFromDep
 
 void ProjectPartChooserTest::testForMultipleChooseNewIfPreviousIsGone()
 {
-    const ProjectPart::Ptr newProjectPart = ProjectPart::create({});
+    const ProjectPart::ConstPtr newProjectPart = ProjectPart::create({});
     ProjectPartChooserTestHelper t;
     t.projectPartsForFile += newProjectPart;
 
@@ -273,7 +273,7 @@ void ProjectPartChooserTest::testForMultipleChooseNewIfPreviousIsGone()
 
 void ProjectPartChooserTest::testFallbackToProjectPartFromDependencies()
 {
-    const ProjectPart::Ptr fromDependencies = ProjectPart::create({});
+    const ProjectPart::ConstPtr fromDependencies = ProjectPart::create({});
     ProjectPartChooserTestHelper t;
     t.projectPartsFromDependenciesForFile += fromDependencies;
 
@@ -306,7 +306,7 @@ void ProjectPartChooserTest::testStopUsingFallbackFromModelManagerIfProjectChang
     t.fallbackProjectPart = ProjectPart::create({});
     t.currentProjectPartInfo.projectPart = t.fallbackProjectPart;
     t.currentProjectPartInfo.hints |= ProjectPartInfo::IsFallbackMatch;
-    const ProjectPart::Ptr addedProject = ProjectPart::create({});
+    const ProjectPart::ConstPtr addedProject = ProjectPart::create({});
     t.projectPartsForFile += addedProject;
 
     QCOMPARE(t.choose().projectPart, addedProject);
@@ -318,7 +318,7 @@ void ProjectPartChooserTest::testStopUsingFallbackFromModelManagerIfProjectChang
     t.fallbackProjectPart = ProjectPart::create({});
     t.currentProjectPartInfo.projectPart = t.fallbackProjectPart;
     t.currentProjectPartInfo.hints |= ProjectPartInfo::IsFallbackMatch;
-    const ProjectPart::Ptr addedProject = ProjectPart::create({});
+    const ProjectPart::ConstPtr addedProject = ProjectPart::create({});
     t.projectPartsFromDependenciesForFile += addedProject;
     t.projectsChanged = true;
 
@@ -380,9 +380,9 @@ public:
         projectUpdateInfo.cToolChainInfo = {&aToolChain, {}, {}};
     }
 
-    ProjectInfo::Ptr generate()
+    ProjectInfo::ConstPtr generate()
     {
-        QFutureInterface<ProjectInfo::Ptr> fi;
+        QFutureInterface<ProjectInfo::ConstPtr> fi;
 
         projectUpdateInfo.rawProjectParts += rawProjectPart;
         ProjectInfoGenerator generator(fi, projectUpdateInfo);
@@ -398,7 +398,7 @@ public:
 void ProjectInfoGeneratorTest::testCreateNoProjectPartsForEmptyFileList()
 {
     ProjectInfoGeneratorTestHelper t;
-    const ProjectInfo::Ptr projectInfo = t.generate();
+    const ProjectInfo::ConstPtr projectInfo = t.generate();
 
     QVERIFY(projectInfo->projectParts().isEmpty());
 }
@@ -407,7 +407,7 @@ void ProjectInfoGeneratorTest::testCreateSingleProjectPart()
 {
     ProjectInfoGeneratorTestHelper t;
     t.rawProjectPart.files = QStringList{ "foo.cpp", "foo.h"};
-    const ProjectInfo::Ptr projectInfo = t.generate();
+    const ProjectInfo::ConstPtr projectInfo = t.generate();
 
     QCOMPARE(projectInfo->projectParts().size(), 1);
 }
@@ -416,7 +416,7 @@ void ProjectInfoGeneratorTest::testCreateMultipleProjectParts()
 {
     ProjectInfoGeneratorTestHelper t;
     t.rawProjectPart.files = QStringList{ "foo.cpp", "foo.h", "bar.c", "bar.h" };
-    const ProjectInfo::Ptr projectInfo = t.generate();
+    const ProjectInfo::ConstPtr projectInfo = t.generate();
 
     QCOMPARE(projectInfo->projectParts().size(), 2);
 }
@@ -425,7 +425,7 @@ void ProjectInfoGeneratorTest::testProjectPartIndicatesObjectiveCExtensionsByDef
 {
     ProjectInfoGeneratorTestHelper t;
     t.rawProjectPart.files = QStringList{ "foo.mm" };
-    const ProjectInfo::Ptr projectInfo = t.generate();
+    const ProjectInfo::ConstPtr projectInfo = t.generate();
     QCOMPARE(projectInfo->projectParts().size(), 1);
 
     const ProjectPart &projectPart = *projectInfo->projectParts().at(0);
@@ -436,7 +436,7 @@ void ProjectInfoGeneratorTest::testProjectPartHasLatestLanguageVersionByDefault(
 {
     ProjectInfoGeneratorTestHelper t;
     t.rawProjectPart.files = QStringList{ "foo.cpp" };
-    const ProjectInfo::Ptr projectInfo = t.generate();
+    const ProjectInfo::ConstPtr projectInfo = t.generate();
     QCOMPARE(projectInfo->projectParts().size(), 1);
 
     const ProjectPart &projectPart = *projectInfo->projectParts().at(0);
@@ -450,7 +450,7 @@ void ProjectInfoGeneratorTest::testUseMacroInspectionReportForLanguageVersion()
         return TestToolchain::MacroInspectionReport{Macros(), Utils::LanguageVersion::CXX17};
     };
     t.rawProjectPart.files = QStringList{ "foo.cpp" };
-    const ProjectInfo::Ptr projectInfo = t.generate();
+    const ProjectInfo::ConstPtr projectInfo = t.generate();
 
     QCOMPARE(projectInfo->projectParts().size(), 1);
 
@@ -463,7 +463,7 @@ void ProjectInfoGeneratorTest::testUseCompilerFlagsForLanguageExtensions()
     ProjectInfoGeneratorTestHelper t;
     t.rawProjectPart.files = QStringList{ "foo.cpp" };
     t.rawProjectPart.flagsForCxx.languageExtensions = Utils::LanguageExtension::Microsoft;
-    const ProjectInfo::Ptr projectInfo = t.generate();
+    const ProjectInfo::ConstPtr projectInfo = t.generate();
 
     QCOMPARE(projectInfo->projectParts().size(), 1);
 
@@ -475,22 +475,22 @@ void ProjectInfoGeneratorTest::testProjectFileKindsMatchProjectPartVersion()
 {
     ProjectInfoGeneratorTestHelper t;
     t.rawProjectPart.files = QStringList{ "foo.h" };
-    const ProjectInfo::Ptr projectInfo = t.generate();
+    const ProjectInfo::ConstPtr projectInfo = t.generate();
 
     QCOMPARE(projectInfo->projectParts().size(), 4);
-    QVERIFY(Utils::contains(projectInfo->projectParts(), [](const ProjectPart::Ptr &p) {
+    QVERIFY(Utils::contains(projectInfo->projectParts(), [](const ProjectPart::ConstPtr &p) {
         return p->languageVersion == Utils::LanguageVersion::LatestC
                 && p->files.first().kind == ProjectFile::CHeader;
     }));
-    QVERIFY(Utils::contains(projectInfo->projectParts(), [](const ProjectPart::Ptr &p) {
+    QVERIFY(Utils::contains(projectInfo->projectParts(), [](const ProjectPart::ConstPtr &p) {
         return p->languageVersion == Utils::LanguageVersion::LatestC
                 && p->files.first().kind == ProjectFile::ObjCHeader;
     }));
-    QVERIFY(Utils::contains(projectInfo->projectParts(), [](const ProjectPart::Ptr &p) {
+    QVERIFY(Utils::contains(projectInfo->projectParts(), [](const ProjectPart::ConstPtr &p) {
         return p->languageVersion == Utils::LanguageVersion::LatestCxx
                 && p->files.first().kind == ProjectFile::CXXHeader;
     }));
-    QVERIFY(Utils::contains(projectInfo->projectParts(), [](const ProjectPart::Ptr &p) {
+    QVERIFY(Utils::contains(projectInfo->projectParts(), [](const ProjectPart::ConstPtr &p) {
         return p->languageVersion == Utils::LanguageVersion::LatestCxx
                 && p->files.first().kind == ProjectFile::ObjCXXHeader;
     }));
@@ -548,7 +548,7 @@ public:
     Utils::optional<HeaderPathFilter> filter;
 
 private:
-    ProjectPart::Ptr projectPart;
+    ProjectPart::ConstPtr projectPart;
 };
 }
 
diff --git a/src/plugins/cpptools/projectpart.h b/src/plugins/cpptools/projectpart.h
index 4f1cee28aa..84a76cbdb1 100644
--- a/src/plugins/cpptools/projectpart.h
+++ b/src/plugins/cpptools/projectpart.h
@@ -55,10 +55,10 @@ public:
         WordWidth64Bit,
     };
 
-    using Ptr = QSharedPointer<ProjectPart>;
+    using ConstPtr = QSharedPointer<const ProjectPart>;
 
 public:
-    static Ptr create(const Utils::FilePath &topLevelProject,
+    static ConstPtr create(const Utils::FilePath &topLevelProject,
                       const ProjectExplorer::RawProjectPart &rpp = {},
                       const QString &displayName = {},
                       const ProjectFiles &files = {},
@@ -67,7 +67,7 @@ public:
                       const ProjectExplorer::RawProjectPartFlags &flags = {},
                       const ProjectExplorer::ToolChainInfo &tcInfo = {})
     {
-        return Ptr(new ProjectPart(topLevelProject, rpp, displayName, files, language,
+        return ConstPtr(new ProjectPart(topLevelProject, rpp, displayName, files, language,
                                    languageExtensions, flags, tcInfo));
     }
 
diff --git a/src/plugins/cpptools/refactoringengineinterface.h b/src/plugins/cpptools/refactoringengineinterface.h
index d5a95fe0f6..9ac3d8bb08 100644
--- a/src/plugins/cpptools/refactoringengineinterface.h
+++ b/src/plugins/cpptools/refactoringengineinterface.h
@@ -65,7 +65,7 @@ public:
     virtual ~RefactoringEngineInterface() = default;
 
     virtual void startLocalRenaming(const CursorInEditor &data,
-                                    CppTools::ProjectPart *projectPart,
+                                    const CppTools::ProjectPart *projectPart,
                                     RenameCallback &&renameSymbolsCallback) = 0;
     virtual void globalRename(const CursorInEditor &data,
                               UsagesCallback &&renameCallback,
diff --git a/src/plugins/cpptools/symbolfinder.cpp b/src/plugins/cpptools/symbolfinder.cpp
index 7147f1d1c4..f9606e289d 100644
--- a/src/plugins/cpptools/symbolfinder.cpp
+++ b/src/plugins/cpptools/symbolfinder.cpp
@@ -492,7 +492,7 @@ void SymbolFinder::checkCacheConsistency(const QString &referenceFile, const Sna
 
 const QString projectPartIdForFile(const QString &filePath)
 {
-    const QList<ProjectPart::Ptr> parts = CppModelManager::instance()->projectPart(filePath);
+    const QList<ProjectPart::ConstPtr> parts = CppModelManager::instance()->projectPart(filePath);
     if (!parts.isEmpty())
         return parts.first()->id();
     return QString();
diff --git a/src/plugins/todo/cpptodoitemsscanner.cpp b/src/plugins/todo/cpptodoitemsscanner.cpp
index 2bcdb35499..08d82eae35 100644
--- a/src/plugins/todo/cpptodoitemsscanner.cpp
+++ b/src/plugins/todo/cpptodoitemsscanner.cpp
@@ -58,7 +58,7 @@ void CppTodoItemsScanner::scannerParamsChanged()
     CppTools::CppModelManager *modelManager = CppTools::CppModelManager::instance();
 
     QSet<QString> filesToBeUpdated;
-    foreach (const CppTools::ProjectInfo::Ptr &info, modelManager->projectInfos())
+    foreach (const CppTools::ProjectInfo::ConstPtr &info, modelManager->projectInfos())
         filesToBeUpdated.unite(info->sourceFiles());
 
     modelManager->updateSourceFiles(filesToBeUpdated);