CppEditor: Introduce per-project code model settings

Change-Id: I325cc39e60d4b1f0fba1651502d772bfb9c6a91c
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: David Schulz <david.schulz@qt.io>

24 files changed, 430 insertions, 69 deletions

diff --git a/src/plugins/clangcodemodel/clangdclient.cpp b/src/plugins/clangcodemodel/clangdclient.cpp
index 23dd71af16..bf04848652 100644
--- a/src/plugins/clangcodemodel/clangdclient.cpp
+++ b/src/plugins/clangcodemodel/clangdclient.cpp
@@ -419,7 +419,7 @@ ClangdClient::ClangdClient(Project *project, const Utils::FilePath &jsonDbDir, c
                     *CppEditor::CppModelManager::fallbackProjectPart(),
                     warningsConfigForProject(nullptr), includeDir, {});
         const CppEditor::UsePrecompiledHeaders usePch
-            = CppEditor::CppCodeModelSettings::instance().usePrecompiledHeaders();
+            = CppEditor::CppCodeModelSettings::usePrecompiledHeaders(nullptr);
         const QJsonArray projectPartOptions = fullProjectPartOptions(
                     optionsBuilder, globalClangOptions());
         const QJsonArray clangOptions = clangOptionsForFile({}, optionsBuilder.projectPart(),
@@ -600,7 +600,7 @@ void ClangdClient::findUsages(const CppEditor::CursorInEditor &cursor,
         }
     }
 
-    const bool categorize = CppEditor::CppCodeModelSettings::instance().categorizeFindReferences();
+    const bool categorize = CppEditor::CppCodeModelSettings::categorizeFindReferences();
 
     // If it's a "normal" symbol, go right ahead.
     if (searchTerm != "operator" && Utils::allOf(searchTerm, [](const QChar &c) {
@@ -920,9 +920,11 @@ void ClangdClient::updateParserConfig(const Utils::FilePath &filePath,
                                       CppEditor::ProjectFile::classify(filePath.toString()));
     const QJsonArray projectPartOptions = fullProjectPartOptions(
                 optionsBuilder, globalClangOptions());
+    const auto cppSettings = CppEditor::CppCodeModelSettings::settingsForProject(
+        projectPart->topLevelProject);
     addToCompilationDb(cdbChanges,
                        *projectPart,
-                       CppEditor::CppCodeModelSettings::instance().usePrecompiledHeaders(),
+                       cppSettings.usePrecompiledHeaders(),
                        projectPartOptions,
                        filePath.parentDir(),
                        file,
diff --git a/src/plugins/clangcodemodel/clangutils.cpp b/src/plugins/clangcodemodel/clangutils.cpp
index a718a9ed96..5e7f454d5e 100644
--- a/src/plugins/clangcodemodel/clangutils.cpp
+++ b/src/plugins/clangcodemodel/clangutils.cpp
@@ -166,7 +166,6 @@ GenerateCompilationDbResult generateCompilationDB(QList<ProjectInfo::ConstPtr> p
     }
     compileCommandsFile.write("[");
 
-    const UsePrecompiledHeaders usePch = CppCodeModelSettings::instance().usePrecompiledHeaders();
     const QJsonArray jsonProjectOptions = QJsonArray::fromStringList(projectOptions);
     for (const ProjectInfo::ConstPtr &projectInfo : std::as_const(projectInfoList)) {
         QTC_ASSERT(projectInfo, continue);
@@ -183,9 +182,15 @@ GenerateCompilationDbResult generateCompilationDB(QList<ProjectInfo::ConstPtr> p
                                                    jsonProjectOptions);
             }
             for (const ProjectFile &projFile : projectPart->files) {
-                const QJsonObject json = createFileObject(baseDir, args, *projectPart, projFile,
-                                                          purpose, ppOptions, usePch,
-                                                          optionsBuilder.isClStyle());
+                const QJsonObject json
+                    = createFileObject(baseDir,
+                                       args,
+                                       *projectPart,
+                                       projFile,
+                                       purpose,
+                                       ppOptions,
+                                       projectInfo->settings().usePrecompiledHeaders(),
+                                       optionsBuilder.isClStyle());
                 if (compileCommandsFile.size() > 1)
                     compileCommandsFile.write(",");
                 compileCommandsFile.write(QJsonDocument(json).toJson(QJsonDocument::Compact));
diff --git a/src/plugins/clangcodemodel/test/clangdtests.cpp b/src/plugins/clangcodemodel/test/clangdtests.cpp
index 88a3176a6b..ae92afb45f 100644
--- a/src/plugins/clangcodemodel/test/clangdtests.cpp
+++ b/src/plugins/clangcodemodel/test/clangdtests.cpp
@@ -249,7 +249,7 @@ private:
 void ClangdTestFindReferences::initTestCase()
 {
     ClangdTest::initTestCase();
-    CppEditor::CppCodeModelSettings::instance().setCategorizeFindReferences(true);
+    CppEditor::CppCodeModelSettings::setCategorizeFindReferences(true);
     connect(client(), &ClangdClient::foundReferences, this,
             [this](const SearchResultItems &results) {
         if (results.isEmpty())
diff --git a/src/plugins/clangtools/clangfileinfo.h b/src/plugins/clangtools/clangfileinfo.h
index e9a7151160..deb53f6058 100644
--- a/src/plugins/clangtools/clangfileinfo.h
+++ b/src/plugins/clangtools/clangfileinfo.h
@@ -3,6 +3,7 @@
 
 #pragma once
 
+#include <cppeditor/cppcodemodelsettings.h>
 #include <cppeditor/cppprojectfile.h>
 #include <cppeditor/projectpart.h>
 
@@ -19,9 +20,11 @@ public:
     FileInfo() = default;
     FileInfo(Utils::FilePath file,
              CppEditor::ProjectFile::Kind kind,
+             const CppEditor::CppCodeModelSettings &settings,
              CppEditor::ProjectPart::ConstPtr projectPart)
         : file(std::move(file))
         , kind(kind)
+        , settings(settings.data())
         , projectPart(projectPart)
     {}
 
@@ -31,6 +34,7 @@ public:
 
     Utils::FilePath file;
     CppEditor::ProjectFile::Kind kind;
+    CppEditor::CppCodeModelSettings::Data settings;
     CppEditor::ProjectPart::ConstPtr projectPart;
 };
 using FileInfos = std::vector<FileInfo>;
diff --git a/src/plugins/clangtools/clangtool.cpp b/src/plugins/clangtools/clangtool.cpp
index 15635fc251..b7108a4389 100644
--- a/src/plugins/clangtools/clangtool.cpp
+++ b/src/plugins/clangtools/clangtool.cpp
@@ -341,7 +341,8 @@ private:
     QMap<FilePath, RefactoringFileInfo> m_refactoringFileInfos;
 };
 
-static FileInfos sortedFileInfos(const QVector<ProjectPart::ConstPtr> &projectParts)
+static FileInfos sortedFileInfos(const CppCodeModelSettings &settings,
+                                 const QVector<ProjectPart::ConstPtr> &projectParts)
 {
     FileInfos fileInfos;
 
@@ -359,7 +360,7 @@ static FileInfos sortedFileInfos(const QVector<ProjectPart::ConstPtr> &projectPa
             if (file.active && (ProjectFile::isSource(file.kind)
                                 || ProjectFile::isHeader(file.kind))) {
                 ProjectFile::Kind sourceKind = ProjectFile::sourceKind(file.kind);
-                fileInfos.emplace_back(file.path, sourceKind, projectPart);
+                fileInfos.emplace_back(file.path, sourceKind, settings, projectPart);
             }
         }
     }
@@ -901,7 +902,8 @@ FileInfos ClangTool::collectFileInfos(Project *project, FileSelection fileSelect
     const auto projectInfo = CppModelManager::projectInfo(project);
     QTC_ASSERT(projectInfo, return FileInfos());
 
-    const FileInfos allFileInfos = sortedFileInfos(projectInfo->projectParts());
+    const FileInfos allFileInfos = sortedFileInfos(projectInfo->settings(),
+                                                   projectInfo->projectParts());
 
     if (selectionType && *selectionType == FileSelectionType::AllFiles)
         return allFileInfos;
diff --git a/src/plugins/clangtools/clangtoolrunner.cpp b/src/plugins/clangtools/clangtoolrunner.cpp
index 13fdfba742..af3539b2ac 100644
--- a/src/plugins/clangtools/clangtoolrunner.cpp
+++ b/src/plugins/clangtools/clangtoolrunner.cpp
@@ -51,7 +51,7 @@ AnalyzeUnit::AnalyzeUnit(const FileInfo &fileInfo,
     arguments = extraClangToolsPrependOptions();
     arguments.append(
         optionsBuilder.build(fileInfo.kind,
-                             CppEditor::CppCodeModelSettings::instance().usePrecompiledHeaders()));
+                             CppCodeModelSettings(fileInfo.settings).usePrecompiledHeaders()));
     arguments.append(extraClangToolsAppendOptions());
 }
 
diff --git a/src/plugins/clangtools/documentclangtoolrunner.cpp b/src/plugins/clangtools/documentclangtoolrunner.cpp
index d503f80d63..1e3055cb48 100644
--- a/src/plugins/clangtools/documentclangtoolrunner.cpp
+++ b/src/plugins/clangtools/documentclangtoolrunner.cpp
@@ -132,10 +132,12 @@ static FileInfo getFileInfo(const FilePath &file, Project *project)
             // found the best candidate, early return
             ProjectFile::Kind sourceKind = ProjectFile::sourceKind(projectFile.kind);
             if (projectPart->buildTargetType != BuildTargetType::Unknown)
-                return FileInfo(projectFile.path, sourceKind, projectPart);
+                return FileInfo(projectFile.path, sourceKind, projectInfo->settings(), projectPart);
             // found something but keep looking for better candidates
-            if (candidate.projectPart.isNull())
-                candidate = FileInfo(projectFile.path, sourceKind, projectPart);
+            if (candidate.projectPart.isNull()) {
+                candidate
+                    = FileInfo(projectFile.path, sourceKind, projectInfo->settings(), projectPart);
+            }
         }
     }
 
diff --git a/src/plugins/cppeditor/baseeditordocumentprocessor.cpp b/src/plugins/cppeditor/baseeditordocumentprocessor.cpp
index d377a25337..786999223e 100644
--- a/src/plugins/cppeditor/baseeditordocumentprocessor.cpp
+++ b/src/plugins/cppeditor/baseeditordocumentprocessor.cpp
@@ -27,7 +27,8 @@ namespace CppEditor {
 BaseEditorDocumentProcessor::BaseEditorDocumentProcessor(QTextDocument *textDocument,
                                                          const Utils::FilePath &filePath)
     : m_filePath(filePath),
-      m_textDocument(textDocument)
+      m_textDocument(textDocument),
+      m_settings(CppCodeModelSettings::settingsForFile(filePath))
 {
 }
 
@@ -35,9 +36,11 @@ BaseEditorDocumentProcessor::~BaseEditorDocumentProcessor() = default;
 
 void BaseEditorDocumentProcessor::run(bool projectsUpdated)
 {
+    if (projectsUpdated)
+        m_settings.setData(CppCodeModelSettings::settingsForFile(m_filePath).data());
+
     const Utils::Language languagePreference
-        = CppCodeModelSettings::instance().interpretAmbigiousHeadersAsC() ? Utils::Language::C
-                                                                          : Utils::Language::Cxx;
+        = m_settings.interpretAmbigiousHeadersAsC() ? Utils::Language::C : Utils::Language::Cxx;
 
     runImpl({CppModelManager::workingCopy(),
              ProjectExplorer::ProjectManager::startupProject(),
diff --git a/src/plugins/cppeditor/baseeditordocumentprocessor.h b/src/plugins/cppeditor/baseeditordocumentprocessor.h
index 78c0f55aab..c825dc7a84 100644
--- a/src/plugins/cppeditor/baseeditordocumentprocessor.h
+++ b/src/plugins/cppeditor/baseeditordocumentprocessor.h
@@ -4,6 +4,7 @@
 #pragma once
 
 #include "baseeditordocumentparser.h"
+#include "cppcodemodelsettings.h"
 #include "cppcursorinfo.h"
 #include "cppeditor_global.h"
 #include "cppsemanticinfo.h"
@@ -72,6 +73,7 @@ public:
     virtual QFuture<CursorInfo> cursorInfo(const CursorInfoParams &params) = 0;
 
     const Utils::FilePath &filePath() const { return m_filePath; }
+    const CppCodeModelSettings &settings() const { return m_settings; }
 
 signals:
     // Signal interface to implement
@@ -102,6 +104,7 @@ private:
 private:
     Utils::FilePath m_filePath;
     QTextDocument *m_textDocument;
+    CppCodeModelSettings m_settings;
 };
 
 } // namespace CppEditor
diff --git a/src/plugins/cppeditor/builtineditordocumentprocessor.cpp b/src/plugins/cppeditor/builtineditordocumentprocessor.cpp
index bd820c9222..5f827c74ce 100644
--- a/src/plugins/cppeditor/builtineditordocumentprocessor.cpp
+++ b/src/plugins/cppeditor/builtineditordocumentprocessor.cpp
@@ -144,16 +144,14 @@ QList<TextEditor::BlockRange> toTextEditorBlocks(
 BuiltinEditorDocumentProcessor::BuiltinEditorDocumentProcessor(TextEditor::TextDocument *document)
     : BaseEditorDocumentProcessor(document->document(), document->filePath())
     , m_parser(new BuiltinEditorDocumentParser(document->filePath(),
-                                               CppCodeModelSettings::instance()
-                                                   .effectiveIndexerFileSizeLimitInMb()))
+                                               settings().effectiveIndexerFileSizeLimitInMb()))
     , m_codeWarningsUpdated(false)
     , m_semanticHighlighter(new SemanticHighlighter(document))
 {
     using namespace Internal;
 
     BaseEditorDocumentParser::Configuration config = m_parser->configuration();
-    config.usePrecompiledHeaders = CppCodeModelSettings::instance().pchUsage()
-                                   != CppCodeModelSettings::PchUse_None;
+    config.usePrecompiledHeaders = settings().pchUsage() != CppCodeModelSettings::PchUse_None;
     m_parser->setConfiguration(config);
 
     m_semanticHighlighter->setHighlightingRunner(
diff --git a/src/plugins/cppeditor/cppcodemodelsettings.cpp b/src/plugins/cppeditor/cppcodemodelsettings.cpp
index 8a28fcf691..5c8e3caff1 100644
--- a/src/plugins/cppeditor/cppcodemodelsettings.cpp
+++ b/src/plugins/cppeditor/cppcodemodelsettings.cpp
@@ -13,6 +13,7 @@
 #include <coreplugin/session.h>
 
 #include <projectexplorer/project.h>
+#include <projectexplorer/projectmanager.h>
 
 #include <utils/algorithm.h>
 #include <utils/hostosinfo.h>
@@ -28,6 +29,7 @@
 #include <QSettings>
 #include <QStandardPaths>
 
+using namespace ProjectExplorer;
 using namespace Utils;
 
 namespace CppEditor {
@@ -56,7 +58,7 @@ static Key clangdThreadLimitKey() { return "ClangdThreadLimit"; }
 static Key clangdDocumentThresholdKey() { return "ClangdDocumentThreshold"; }
 static Key clangdSizeThresholdEnabledKey() { return "ClangdSizeThresholdEnabled"; }
 static Key clangdSizeThresholdKey() { return "ClangdSizeThreshold"; }
-static Key clangdUseGlobalSettingsKey() { return "useGlobalSettings"; }
+static Key useGlobalSettingsKey() { return "useGlobalSettings"; }
 static Key clangdblockIndexingSettingsKey() { return "blockIndexing"; }
 static Key sessionsWithOneClangdKey() { return "SessionsWithOneClangd"; }
 static Key diagnosticConfigIdKey() { return "diagnosticConfigId"; }
@@ -116,48 +118,118 @@ void CppCodeModelSettings::Data::fromMap(const Utils::Store &store)
 void CppCodeModelSettings::fromSettings(QtcSettings *s)
 {
     m_data.fromMap(storeFromSettings(Constants::CPPEDITOR_SETTINGSGROUP, s));
-    emit changed();
 }
 
 void CppCodeModelSettings::toSettings(QtcSettings *s)
 {
-    const Data def;
-    storeToSettingsWithDefault(Constants::CPPEDITOR_SETTINGSGROUP, s, m_data.toMap(), def.toMap());
-    emit changed(); // TODO: Why?
+    storeToSettingsWithDefault(Constants::CPPEDITOR_SETTINGSGROUP, s, m_data.toMap(), Data().toMap());
 }
 
-CppCodeModelSettings &CppCodeModelSettings::instance()
+CppCodeModelSettings &CppCodeModelSettings::globalInstance()
 {
     static CppCodeModelSettings theCppCodeModelSettings(Core::ICore::settings());
     return theCppCodeModelSettings;
 }
 
-void CppCodeModelSettings::setData(const Data &data)
+CppCodeModelSettings CppCodeModelSettings::settingsForProject(const ProjectExplorer::Project *project)
 {
-    if (m_data != data) {
-        m_data = data;
-        toSettings(Core::ICore::settings());
-        emit changed();
-    }
+    return {CppCodeModelProjectSettings(const_cast<ProjectExplorer::Project *>(project)).data()};
+}
+
+CppCodeModelSettings CppCodeModelSettings::settingsForProject(const Utils::FilePath &projectFile)
+{
+    return settingsForProject(ProjectManager::projectWithProjectFilePath(projectFile));
+}
+
+CppCodeModelSettings CppCodeModelSettings::settingsForFile(const Utils::FilePath &file)
+{
+    return settingsForProject(ProjectManager::projectForFile(file));
+}
+
+void CppCodeModelSettings::setGlobalData(const Data &data)
+{
+    if (globalInstance().m_data == data)
+        return;
+
+    globalInstance().m_data = data;
+    globalInstance().toSettings(Core::ICore::settings());
+    emit globalInstance().changed(nullptr);
+}
+
+CppCodeModelSettings::PCHUsage CppCodeModelSettings::pchUsage(const Project *project)
+{
+    return CppCodeModelSettings::settingsForProject(project).pchUsage();
 }
 
 UsePrecompiledHeaders CppCodeModelSettings::usePrecompiledHeaders() const
 {
-    if (instance().pchUsage() == CppCodeModelSettings::PchUse_None)
-        return UsePrecompiledHeaders::No;
-    return UsePrecompiledHeaders::Yes;
+    return pchUsage() == CppCodeModelSettings::PchUse_None ? UsePrecompiledHeaders::No
+                                                           : UsePrecompiledHeaders::Yes;
+}
+
+UsePrecompiledHeaders CppCodeModelSettings::usePrecompiledHeaders(const Project *project)
+{
+    return CppCodeModelSettings::settingsForProject(project).usePrecompiledHeaders();
 }
 
 int CppCodeModelSettings::effectiveIndexerFileSizeLimitInMb() const
 {
-    return instance().skipIndexingBigFiles() ? instance().indexerFileSizeLimitInMb() : -1;
+    return skipIndexingBigFiles() ? indexerFileSizeLimitInMb() : -1;
+}
+
+bool CppCodeModelSettings::categorizeFindReferences()
+{
+    return globalInstance().m_data.categorizeFindReferences;
 }
 
 void CppCodeModelSettings::setCategorizeFindReferences(bool categorize)
 {
-    Data d = data();
+    Data d = globalInstance().data();
     d.categorizeFindReferences = categorize;
-    setData(d);
+    globalInstance().setGlobalData(d);
+}
+
+CppCodeModelProjectSettings::CppCodeModelProjectSettings(ProjectExplorer::Project *project)
+    : m_project(project)
+{
+    loadSettings();
+}
+
+CppCodeModelSettings::Data CppCodeModelProjectSettings::data() const
+{
+    return m_useGlobalSettings ? CppCodeModelSettings::globalInstance().data() : m_customSettings;
+}
+
+void CppCodeModelProjectSettings::setData(const CppCodeModelSettings::Data &data)
+{
+    m_customSettings = data;
+    saveSettings();
+    emit CppCodeModelSettings::globalInstance().changed(m_project);
+}
+
+void CppCodeModelProjectSettings::setUseGlobalSettings(bool useGlobal)
+{
+    m_useGlobalSettings = useGlobal;
+    saveSettings();
+    emit CppCodeModelSettings::globalInstance().changed(m_project);
+}
+
+void CppCodeModelProjectSettings::loadSettings()
+{
+    if (!m_project)
+        return;
+    const Store data = storeFromVariant(m_project->namedSettings(Constants::CPPEDITOR_SETTINGSGROUP));
+    m_useGlobalSettings = data.value(useGlobalSettingsKey(), true).toBool();
+    m_customSettings.fromMap(data);
+}
+
+void CppCodeModelProjectSettings::saveSettings()
+{
+    if (!m_project)
+        return;
+    Store data = m_customSettings.toMap();
+    data.insert(useGlobalSettingsKey(), m_useGlobalSettings);
+    m_project->setNamedSettings(Constants::CPPEDITOR_SETTINGSGROUP, variantFromStore(data));
 }
 
 QString ClangdSettings::priorityToString(const IndexingPriority &priority)
@@ -513,7 +585,7 @@ void ClangdProjectSettings::loadSettings()
     if (!m_project)
         return;
     const Store data = storeFromVariant(m_project->namedSettings(clangdSettingsKey()));
-    m_useGlobalSettings = data.value(clangdUseGlobalSettingsKey(), true).toBool();
+    m_useGlobalSettings = data.value(useGlobalSettingsKey(), true).toBool();
     m_blockIndexing = data.value(clangdblockIndexingSettingsKey(), false).toBool();
     if (!m_useGlobalSettings)
         m_customSettings.fromMap(data);
@@ -526,7 +598,7 @@ void ClangdProjectSettings::saveSettings()
     Store data;
     if (!m_useGlobalSettings)
         data = m_customSettings.toMap();
-    data.insert(clangdUseGlobalSettingsKey(), m_useGlobalSettings);
+    data.insert(useGlobalSettingsKey(), m_useGlobalSettings);
     data.insert(clangdblockIndexingSettingsKey(), m_blockIndexing);
     m_project->setNamedSettings(clangdSettingsKey(), variantFromStore(data));
 }
diff --git a/src/plugins/cppeditor/cppcodemodelsettings.h b/src/plugins/cppeditor/cppcodemodelsettings.h
index c76f3318f2..19cc078b26 100644
--- a/src/plugins/cppeditor/cppcodemodelsettings.h
+++ b/src/plugins/cppeditor/cppcodemodelsettings.h
@@ -37,6 +37,8 @@ public:
     class Data
     {
     public:
+        Data() = default;
+        Data(const Utils::Store &store) { fromMap(store); }
         Utils::Store toMap() const;
         void fromMap(const Utils::Store &store);
 
@@ -53,26 +55,35 @@ public:
         QString ignorePattern;
     };
 
-    static CppCodeModelSettings &instance();
+    CppCodeModelSettings(const Data &data) : m_data(data) {}
 
-    void setData(const Data &data);
+    static CppCodeModelSettings &globalInstance(); // TODO: Make inaccessible.
+    static CppCodeModelSettings settingsForProject(const ProjectExplorer::Project *project);
+    static CppCodeModelSettings settingsForProject(const Utils::FilePath &projectFile);
+    static CppCodeModelSettings settingsForFile(const Utils::FilePath &file);
+
+    static void setGlobalData(const Data &data); // TODO: Make inaccessible.
+    void setData(const Data &data) { m_data = data; }
     Data data() const { return m_data; }
 
     PCHUsage pchUsage() const { return m_data.pchUsage; }
+    static PCHUsage pchUsage(const ProjectExplorer::Project *project);
     UsePrecompiledHeaders usePrecompiledHeaders() const;
+    static UsePrecompiledHeaders usePrecompiledHeaders(const ProjectExplorer::Project *project);
+
     bool interpretAmbigiousHeadersAsC() const { return m_data.interpretAmbigiousHeadersAsC; }
     bool skipIndexingBigFiles() const { return m_data.skipIndexingBigFiles; }
     bool useBuiltinPreprocessor() const { return m_data.useBuiltinPreprocessor; }
     int indexerFileSizeLimitInMb() const { return m_data.indexerFileSizeLimitInMb; }
     int effectiveIndexerFileSizeLimitInMb() const;
-    bool categorizeFindReferences() const { return m_data.categorizeFindReferences; }
     bool ignoreFiles() const { return m_data.ignoreFiles; }
     QString ignorePattern() const { return m_data.ignorePattern; }
 
-    void setCategorizeFindReferences(bool categorize);
+    static bool categorizeFindReferences();
+    static void setCategorizeFindReferences(bool categorize);
 
 signals:
-    void changed();
+    void changed(ProjectExplorer::Project *project);
 
 private:
     CppCodeModelSettings() = default;
@@ -84,6 +95,25 @@ private:
     Data m_data;
 };
 
+class CppCodeModelProjectSettings
+{
+public:
+    CppCodeModelProjectSettings(ProjectExplorer::Project *project);
+
+    CppCodeModelSettings::Data data() const;
+    void setData(const CppCodeModelSettings::Data &data);
+    bool useGlobalSettings() const { return m_useGlobalSettings; }
+    void setUseGlobalSettings(bool useGlobal);
+
+private:
+    void loadSettings();
+    void saveSettings();
+
+    ProjectExplorer::Project * const m_project;
+    CppCodeModelSettings::Data m_customSettings;
+    bool m_useGlobalSettings = true;
+};
+
 class CPPEDITOR_EXPORT ClangdSettings : public QObject
 {
     Q_OBJECT
diff --git a/src/plugins/cppeditor/cppcodemodelsettingspage.cpp b/src/plugins/cppeditor/cppcodemodelsettingspage.cpp
index bb91165705..616bb34f61 100644
--- a/src/plugins/cppeditor/cppcodemodelsettingspage.cpp
+++ b/src/plugins/cppeditor/cppcodemodelsettingspage.cpp
@@ -50,14 +50,18 @@ namespace CppEditor::Internal {
 
 class CppCodeModelSettingsWidget final : public Core::IOptionsPageWidget
 {
+    Q_OBJECT
 public:
     CppCodeModelSettingsWidget(const CppCodeModelSettings::Data &data);
 
-private:
-    void apply() final { CppCodeModelSettings::instance().setData(data()); }
-
     CppCodeModelSettings::Data data() const;
 
+signals:
+    void settingsDataChanged();
+
+private:
+    void apply() final { CppCodeModelSettings::globalInstance().setGlobalData(data()); }
+
     QCheckBox *m_interpretAmbiguousHeadersAsCHeaders;
     QCheckBox *m_ignorePchCheckBox;
     QCheckBox *m_useBuiltinPreprocessorCheckBox;
@@ -126,6 +130,23 @@ CppCodeModelSettingsWidget::CppCodeModelSettingsWidget(const CppCodeModelSetting
         },
         st
     }.attachTo(this);
+
+    for (const QCheckBox *const b : {m_interpretAmbiguousHeadersAsCHeaders,
+                                     m_ignorePchCheckBox,
+                                     m_useBuiltinPreprocessorCheckBox,
+                                     m_skipIndexingBigFilesCheckBox,
+                                     m_ignoreFilesCheckBox}) {
+        connect(b, &QCheckBox::toggled, this, &CppCodeModelSettingsWidget::settingsDataChanged);
+    }
+    connect(m_bigFilesLimitSpinBox, &QSpinBox::valueChanged,
+            this, &CppCodeModelSettingsWidget::settingsDataChanged);
+
+    const auto timer = new QTimer(this);
+    timer->setSingleShot(true);
+    timer->setInterval(1000);
+    connect(timer, &QTimer::timeout, this, &CppCodeModelSettingsWidget::settingsDataChanged);
+    connect(m_ignorePatternTextEdit, &QPlainTextEdit::textChanged,
+            timer, qOverload<>(&QTimer::start));
 }
 
 CppCodeModelSettings::Data CppCodeModelSettingsWidget::data() const
@@ -153,15 +174,62 @@ public:
         setDisplayCategory(Tr::tr("C++"));
         setCategoryIconPath(":/projectexplorer/images/settingscategory_cpp.png");
         setWidgetCreator(
-            [] { return new CppCodeModelSettingsWidget(CppCodeModelSettings::instance().data()); });
+            [] { return new CppCodeModelSettingsWidget(CppCodeModelSettings::globalInstance().data()); });
     }
 };
 
-void setupCppCodeModelSettings()
+void setupCppCodeModelSettingsPage()
 {
     static CppCodeModelSettingsPage theCppCodeModelSettingsPage;
 }
 
+class CppCodeModelProjectSettingsWidget : public ProjectSettingsWidget
+{
+public:
+    CppCodeModelProjectSettingsWidget(const CppCodeModelProjectSettings &settings)
+        : m_settings(settings), m_widget(settings.data())
+    {
+        setGlobalSettingsId(Constants::CPP_CODE_MODEL_SETTINGS_ID);
+        const auto layout = new QVBoxLayout(this);
+        layout->setContentsMargins(0, 0, 0, 0);
+        layout->addWidget(&m_widget);
+
+        setUseGlobalSettings(m_settings.useGlobalSettings());
+        m_widget.setEnabled(!useGlobalSettings());
+        connect(this, &ProjectSettingsWidget::useGlobalSettingsChanged, this,
+                [this](bool checked) {
+                    m_widget.setEnabled(!checked);
+                    m_settings.setUseGlobalSettings(checked);
+                    if (!checked)
+                        m_settings.setData(m_widget.data());
+                });
+
+        connect(&m_widget, &CppCodeModelSettingsWidget::settingsDataChanged,
+                this, [this] { m_settings.setData(m_widget.data()); });
+    }
+
+private:
+    CppCodeModelProjectSettings m_settings;
+    CppCodeModelSettingsWidget m_widget;
+};
+
+class CppCodeModelProjectSettingsPanelFactory final : public ProjectPanelFactory
+{
+public:
+    CppCodeModelProjectSettingsPanelFactory()
+    {
+        setPriority(100);
+        setDisplayName(Tr::tr("C++ Code Model"));
+        setCreateWidgetFunction([](Project *project) {
+            return new CppCodeModelProjectSettingsWidget(project);
+        });
+    }
+};
+void setupCppCodeModelProjectSettingsPanel()
+{
+    static CppCodeModelProjectSettingsPanelFactory factory;
+}
+
 class ClangdSettingsWidget final : public QWidget
 {
     Q_OBJECT
diff --git a/src/plugins/cppeditor/cppcodemodelsettingspage.h b/src/plugins/cppeditor/cppcodemodelsettingspage.h
index 35a6bc5111..4c11b6251e 100644
--- a/src/plugins/cppeditor/cppcodemodelsettingspage.h
+++ b/src/plugins/cppeditor/cppcodemodelsettingspage.h
@@ -5,7 +5,8 @@
 
 namespace CppEditor::Internal {
 
-void setupCppCodeModelSettings();
+void setupCppCodeModelSettingsPage();
+void setupCppCodeModelProjectSettingsPanel();
 void setupClangdProjectSettingsPanel();
 void setupClangdSettingsPage();
 
diff --git a/src/plugins/cppeditor/cppeditorplugin.cpp b/src/plugins/cppeditor/cppeditorplugin.cpp
index a98a76ec42..4328c93970 100644
--- a/src/plugins/cppeditor/cppeditorplugin.cpp
+++ b/src/plugins/cppeditor/cppeditorplugin.cpp
@@ -70,6 +70,7 @@
 #include <projectexplorer/projectexplorerconstants.h>
 #include <projectexplorer/projectmanager.h>
 #include <projectexplorer/projecttree.h>
+#include <projectexplorer/rawprojectpart.h>
 
 #include <texteditor/colorpreviewhoverhandler.h>
 #include <texteditor/snippets/snippetprovider.h>
@@ -202,7 +203,10 @@ void CppEditorPlugin::initialize()
     d = new CppEditorPluginPrivate;
 
     setupCppQuickFixSettings();
-    setupCppCodeModelSettings();
+    setupCppCodeModelSettingsPage();
+    provideCppSettingsRetriever([](const Project *p) {
+        return CppCodeModelSettings::settingsForProject(p).data().toMap();
+    });
     setupCppOutline();
     setupCppCodeStyleSettings();
     setupCppProjectUpdater();
@@ -227,6 +231,7 @@ void CppEditorPlugin::extensionsInitialized()
 {
     setupCppQuickFixProjectPanel();
     setupCppFileSettings();
+    setupCppCodeModelProjectSettingsPanel();
 
     if (CppModelManager::isClangCodeModelActive()) {
         setupClangdProjectSettingsPanel();
@@ -349,9 +354,9 @@ void CppEditorPlugin::addPerSymbolActions()
     findRefsCategorized.addToContainers(menus, Constants::G_SYMBOL);
     findRefsCategorized.addOnTriggered(this, [] {
         if (const auto w = currentCppEditorWidget()) {
-            CppCodeModelSettings::instance().setCategorizeFindReferences(true);
+            CppCodeModelSettings::setCategorizeFindReferences(true);
             w->findUsages();
-            CppCodeModelSettings::instance().setCategorizeFindReferences(false);
+            CppCodeModelSettings::setCategorizeFindReferences(false);
         }
     });
 
diff --git a/src/plugins/cppeditor/cppfindreferences.cpp b/src/plugins/cppeditor/cppfindreferences.cpp
index 683eda587a..35c9400e9a 100644
--- a/src/plugins/cppeditor/cppfindreferences.cpp
+++ b/src/plugins/cppeditor/cppfindreferences.cpp
@@ -388,7 +388,7 @@ void CppFindReferences::findUsages(CPlusPlus::Symbol *symbol,
     search->setTextToReplace(replacement);
     if (callback)
         search->makeNonInteractive(callback);
-    if (CppCodeModelSettings::instance().categorizeFindReferences())
+    if (CppCodeModelSettings::categorizeFindReferences())
         search->setFilter(new CppSearchResultFilter);
     setupSearch(search);
     search->setSearchAgainSupported(true);
@@ -397,7 +397,7 @@ void CppFindReferences::findUsages(CPlusPlus::Symbol *symbol,
     CppFindReferencesParameters parameters;
     parameters.symbolId = fullIdForSymbol(symbol);
     parameters.symbolFilePath = symbol->filePath();
-    parameters.categorize = CppCodeModelSettings::instance().categorizeFindReferences();
+    parameters.categorize = CppCodeModelSettings::categorizeFindReferences();
     parameters.preferLowerCaseFileNames = preferLowerCaseFileNames(
         ProjectManager::projectForFile(symbol->filePath()));
 
@@ -408,8 +408,7 @@ void CppFindReferences::findUsages(CPlusPlus::Symbol *symbol,
     }
 
     search->setUserData(QVariant::fromValue(parameters));
-    findAll_helper(search, symbol, context,
-                   CppCodeModelSettings::instance().categorizeFindReferences());
+    findAll_helper(search, symbol, context, CppCodeModelSettings::categorizeFindReferences());
 }
 
 void CppFindReferences::renameUsages(CPlusPlus::Symbol *symbol,
diff --git a/src/plugins/cppeditor/cppmodelmanager.cpp b/src/plugins/cppeditor/cppmodelmanager.cpp
index 6e81e86f0c..5ea954add4 100644
--- a/src/plugins/cppeditor/cppmodelmanager.cpp
+++ b/src/plugins/cppeditor/cppmodelmanager.cpp
@@ -407,7 +407,7 @@ void CppModelManager::showPreprocessedFile(bool inNextSplit)
         saveAndOpen(outFilePath, content.append(preprocessedDoc->utf8Source()), inNextSplit);
     };
 
-    if (CppCodeModelSettings::instance().useBuiltinPreprocessor()) {
+    if (CppCodeModelSettings::settingsForFile(filePath).useBuiltinPreprocessor()) {
         useBuiltinPreprocessor();
         return;
     }
@@ -1023,6 +1023,9 @@ CppModelManager::CppModelManager()
     connect(ICore::instance(), &ICore::coreAboutToClose,
             this, &CppModelManager::onCoreAboutToClose);
 
+    connect(&CppCodeModelSettings::globalInstance(), &CppCodeModelSettings::changed,
+            this, &CppModelManager::onSettingsChange);
+
     d->m_fallbackProjectPartTimer.setSingleShot(true);
     d->m_fallbackProjectPartTimer.setInterval(5000);
     connect(&d->m_fallbackProjectPartTimer, &QTimer::timeout,
@@ -1349,12 +1352,17 @@ QFuture<void> CppModelManager::updateSourceFiles(const QSet<FilePath> &sourceFil
     if (sourceFiles.isEmpty() || !d->m_indexerEnabled)
         return QFuture<void>();
 
-    const CppCodeModelSettings &settings = CppCodeModelSettings::instance();
-    const QSet<QString> filteredFiles
-        = filteredFilesRemoved(transform(sourceFiles, &FilePath::toString),
-                               settings.effectiveIndexerFileSizeLimitInMb(),
-                               settings.ignoreFiles(),
-                               settings.ignorePattern());
+    QHash<Project *, QSet<QString>> sourcesPerProject; // TODO: Work with QList from here on?
+    for (const FilePath &fp : sourceFiles)
+        sourcesPerProject[ProjectManager::projectForFile(fp)] << fp.toString();
+    QSet<QString> filteredFiles;
+    for (auto it = sourcesPerProject.cbegin(); it != sourcesPerProject.cend(); ++it) {
+        const CppCodeModelSettings settings = CppCodeModelSettings::settingsForProject(it.key());
+        filteredFiles.unite(filteredFilesRemoved(it.value(),
+                                                 settings.effectiveIndexerFileSizeLimitInMb(),
+                                                 settings.ignoreFiles(),
+                                                 settings.ignorePattern()));
+    }
 
     return d->m_internalIndexingSupport->refreshSourceFiles(filteredFiles, mode);
 }
@@ -1992,6 +2000,21 @@ void CppModelManager::onCoreAboutToClose()
     d->m_enableGC = false;
 }
 
+void CppModelManager::onSettingsChange(Project *project)
+{
+    ProjectInfoList info;
+    if (project)
+        info << projectInfo(project);
+    else
+        info << projectInfos();
+    for (const ProjectInfo::ConstPtr &pi : std::as_const(info)) {
+        const CppCodeModelSettings newSettings = CppCodeModelSettings::settingsForProject(
+            pi->projectFilePath());
+        if (pi->settings().data() != newSettings.data())
+            updateProjectInfo(ProjectInfo::cloneWithNewSettings(pi, newSettings));
+    }
+}
+
 void CppModelManager::setupFallbackProjectPart()
 {
     ToolchainInfo tcInfo;
diff --git a/src/plugins/cppeditor/cppmodelmanager.h b/src/plugins/cppeditor/cppmodelmanager.h
index 77cb212c6e..d1a558ce9c 100644
--- a/src/plugins/cppeditor/cppmodelmanager.h
+++ b/src/plugins/cppeditor/cppmodelmanager.h
@@ -288,6 +288,7 @@ private:
     static void onSourceFilesRefreshed();
     static void onCurrentEditorChanged(Core::IEditor *editor);
     static void onCoreAboutToClose();
+    static void onSettingsChange(ProjectExplorer::Project *project);
     static void setupFallbackProjectPart();
 
     static void delayedGC();
diff --git a/src/plugins/cppeditor/cppmodelmanager_test.cpp b/src/plugins/cppeditor/cppmodelmanager_test.cpp
index 9e72a224b9..a896563a61 100644
--- a/src/plugins/cppeditor/cppmodelmanager_test.cpp
+++ b/src/plugins/cppeditor/cppmodelmanager_test.cpp
@@ -19,6 +19,7 @@
 
 #include <projectexplorer/projectexplorer.h>
 #include <projectexplorer/projectmanager.h>
+#include <projectexplorer/projectnodes.h>
 
 #include <utils/hostosinfo.h>
 #include <utils/qtcassert.h>
@@ -1174,4 +1175,105 @@ void ModelManagerTest::testDocumentsAndRevisions()
     VERIFY_DOCUMENT_REVISION(CppModelManager::document(filePath2), 4U);
 }
 
+void ModelManagerTest::testSettingsChanges()
+{
+    ModelManagerTestHelper helper;
+
+    int refreshCount = 0;
+    QSet<QString> refreshedFiles;
+    connect(CppModelManager::instance(), &CppModelManager::sourceFilesRefreshed,
+            &helper, [&](const QSet<QString> &files) {
+        ++refreshCount;
+        refreshedFiles.unite(files);
+    });
+    const auto waitForRefresh = [] {
+        return ::CppEditor::Tests::waitForSignalOrTimeout(CppModelManager::instance(),
+                                                          &CppModelManager::sourceFilesRefreshed,
+                                                          5000);
+    };
+
+    const auto setupProjectNodes = [](Project &p, const ProjectFiles &projectFiles) {
+        auto rootNode = std::make_unique<ProjectNode>(p.projectFilePath());
+        for (const ProjectFile &sourceFile : projectFiles) {
+            rootNode->addNestedNode(std::make_unique<FileNode>(sourceFile.path,
+                                                               sourceFile.isHeader()
+                                                               ? FileType::Header
+                                                                   : FileType::Source));
+        }
+        p.setRootProjectNode(std::move(rootNode));
+    };
+
+    // Set up projects.
+    const MyTestDataDir p1Dir("testdata_project1");
+    const FilePaths p1Files
+        = Utils::transform({"baz.h", "baz2.h", "baz3.h", "foo.cpp", "foo.h", "main.cpp"},
+                           [&](const QString &fn) { return p1Dir.filePath(fn); });
+    const ProjectFiles p1ProjectFiles = Utils::transform(p1Files, [](const FilePath &fp) {
+        return ProjectFile(fp, ProjectFile::classify(fp.toString()));
+    });
+    Project * const p1 = helper.createProject("testdata_project1", FilePath::fromString("p1.pro"));
+    setupProjectNodes(*p1, p1ProjectFiles);
+    RawProjectPart rpp1;
+    const auto part1 = ProjectPart::create(p1->projectFilePath(), rpp1, {}, p1ProjectFiles);
+    const auto pi1 = ProjectInfo::create(ProjectUpdateInfo(p1, KitInfo(nullptr), {}, {}), {part1});
+    const auto p1Sources = Utils::transform<QSet<QString>>(p1Files, &FilePath::toString);
+    CppModelManager::updateProjectInfo(pi1);
+
+    const MyTestDataDir p2Dir("testdata_project2");
+    const FilePaths p2Files
+        = Utils::transform({"bar.h", "bar.cpp", "foobar2000.h", "foobar4000.h", "main.cpp"},
+                           [&](const QString &fn) { return p1Dir.filePath(fn); });
+    const ProjectFiles p2ProjectFiles = Utils::transform(p2Files, [](const FilePath &fp) {
+        return ProjectFile(fp, ProjectFile::classify(fp.toString()));
+    });
+    Project * const p2 = helper.createProject("testdata_project2", FilePath::fromString("p2.pro"));
+    setupProjectNodes(*p2, p2ProjectFiles);
+    RawProjectPart rpp2;
+    const auto part2 = ProjectPart::create(p2->projectFilePath(), rpp2, {}, p2ProjectFiles);
+    const auto pi2 = ProjectInfo::create(ProjectUpdateInfo(p2, KitInfo(nullptr), {}, {}), {part2});
+    const auto p2Sources = Utils::transform<QSet<QString>>(p2Files, &FilePath::toString);
+    CppModelManager::updateProjectInfo(pi2);
+
+    // Initial check: Have all files been indexed?
+    while (refreshCount < 2)
+        QVERIFY(waitForRefresh());
+    const auto allSources = p1Sources + p2Sources;
+    QCOMPARE(refreshedFiles, allSources);
+
+    // Switch first project from global to local settings. Nothing should get re-indexed,
+    // as the default values are the same.
+    refreshCount = 0;
+    refreshedFiles.clear();
+    CppCodeModelProjectSettings p1Settings(p1);
+    QVERIFY(p1Settings.useGlobalSettings());
+    p1Settings.setUseGlobalSettings(false);
+    QCOMPARE(refreshCount, 0);
+    QVERIFY(!waitForRefresh());
+
+    // Change global settings. Only the second project should get re-indexed, as the first one
+    // has its own settings, which are still the same.
+    CppCodeModelSettings::Data globalSettings
+        = CppCodeModelSettings::settingsForProject(nullptr).data();
+    globalSettings.indexerFileSizeLimitInMb = 1;
+    CppCodeModelSettings::setGlobalData(globalSettings);
+    if (refreshCount == 0)
+        QVERIFY(waitForRefresh());
+    QVERIFY(!waitForRefresh());
+    QCOMPARE(refreshedFiles, p2Sources);
+
+    // Change first project's settings. Only this project should get re-indexed.
+    refreshCount = 0;
+    refreshedFiles.clear();
+    CppCodeModelSettings::Data p1Data = p1Settings.data();
+    p1Data.ignoreFiles = true;
+    p1Data.ignorePattern = "baz3.h";
+    p1Settings.setData(p1Data);
+    if (refreshCount == 0)
+        QVERIFY(waitForRefresh());
+    QVERIFY(!waitForRefresh());
+    QSet<QString> filteredP1Sources = p1Sources;
+    filteredP1Sources -= p1Dir.filePath("baz3.h").toString();
+    QCOMPARE(refreshedFiles, filteredP1Sources);
+}
+
 } // CppEditor::Internal
diff --git a/src/plugins/cppeditor/cppmodelmanager_test.h b/src/plugins/cppeditor/cppmodelmanager_test.h
index 939c0f4cca..26cbefd1c8 100644
--- a/src/plugins/cppeditor/cppmodelmanager_test.h
+++ b/src/plugins/cppeditor/cppmodelmanager_test.h
@@ -31,6 +31,7 @@ private slots:
     void testRenameIncludes();
     void testRenameIncludesInEditor();
     void testDocumentsAndRevisions();
+    void testSettingsChanges();
 };
 
 } // namespace CppEditor::Internal
diff --git a/src/plugins/cppeditor/projectinfo.cpp b/src/plugins/cppeditor/projectinfo.cpp
index 57466d1cd9..8a393df6d3 100644
--- a/src/plugins/cppeditor/projectinfo.cpp
+++ b/src/plugins/cppeditor/projectinfo.cpp
@@ -19,6 +19,12 @@ ProjectInfo::ConstPtr ProjectInfo::create(const ProjectExplorer::ProjectUpdateIn
     return ConstPtr(new ProjectInfo(updateInfo, projectParts));
 }
 
+ProjectInfo::ConstPtr ProjectInfo::cloneWithNewSettings(const ConstPtr &pi,
+                                                        const CppCodeModelSettings &settings)
+{
+    return ConstPtr(new ProjectInfo(pi, settings));
+}
+
 bool ProjectInfo::operator ==(const ProjectInfo &other) const
 {
     return m_projectName == other.m_projectName
@@ -27,6 +33,7 @@ bool ProjectInfo::operator ==(const ProjectInfo &other) const
         && m_projectParts == other.m_projectParts
         && m_headerPaths == other.m_headerPaths
         && m_sourceFiles == other.m_sourceFiles
+        && m_settings.data() == other.m_settings.data()
         && m_defines == other.m_defines;
 }
 
@@ -42,7 +49,8 @@ bool ProjectInfo::definesChanged(const ProjectInfo &other) const
 
 bool ProjectInfo::configurationChanged(const ProjectInfo &other) const
 {
-    return definesChanged(other) || m_headerPaths != other.m_headerPaths;
+    return definesChanged(other) || m_headerPaths != other.m_headerPaths
+        || m_settings.data() != other.settings().data();
 }
 
 bool ProjectInfo::configurationOrFilesChanged(const ProjectInfo &other) const
@@ -89,7 +97,20 @@ ProjectInfo::ProjectInfo(const ProjectExplorer::ProjectUpdateInfo &updateInfo,
       m_buildRoot(updateInfo.buildRoot),
       m_headerPaths(getHeaderPaths(projectParts)),
       m_sourceFiles(getSourceFiles(projectParts)),
-      m_defines(getDefines(projectParts))
+      m_defines(getDefines(projectParts)),
+      m_settings(CppCodeModelSettings::Data(updateInfo.cppSettings))
+{
+}
+
+ProjectInfo::ProjectInfo(const ConstPtr &pi, const CppCodeModelSettings &settings)
+    : m_projectParts(pi->projectParts()),
+    m_projectName(pi->projectName()),
+    m_projectFilePath(pi->projectFilePath()),
+    m_buildRoot(pi->buildRoot()),
+    m_headerPaths(pi->m_headerPaths),
+    m_sourceFiles(pi->sourceFiles()),
+    m_defines(pi->m_defines),
+    m_settings(settings.data())
 {
 }
 
diff --git a/src/plugins/cppeditor/projectinfo.h b/src/plugins/cppeditor/projectinfo.h
index 26f92eb6a7..3b18c7ae6f 100644
--- a/src/plugins/cppeditor/projectinfo.h
+++ b/src/plugins/cppeditor/projectinfo.h
@@ -5,6 +5,7 @@
 
 #include "cppeditor_global.h"
 
+#include "cppcodemodelsettings.h"
 #include "projectpart.h"
 
 #include <projectexplorer/project.h>
@@ -28,6 +29,8 @@ public:
     using ConstPtr = std::shared_ptr<const ProjectInfo>;
     static ConstPtr create(const ProjectExplorer::ProjectUpdateInfo &updateInfo,
                            const QVector<ProjectPart::ConstPtr> &projectParts);
+    static ConstPtr cloneWithNewSettings(const ProjectInfo::ConstPtr &pi,
+                                         const CppCodeModelSettings &settings);
 
     const QVector<ProjectPart::ConstPtr> &projectParts() const { return m_projectParts; }
     const QSet<Utils::FilePath> &sourceFiles() const { return m_sourceFiles; }
@@ -35,6 +38,7 @@ public:
     Utils::FilePath projectFilePath() const { return m_projectFilePath; }
     Utils::FilePath projectRoot() const { return m_projectFilePath.parentDir(); }
     Utils::FilePath buildRoot() const { return m_buildRoot; }
+    const CppCodeModelSettings &settings() const { return m_settings; }
 
     // Comparisons
     bool operator ==(const ProjectInfo &other) const;
@@ -46,6 +50,7 @@ public:
 private:
     ProjectInfo(const ProjectExplorer::ProjectUpdateInfo &updateInfo,
                 const QVector<ProjectPart::ConstPtr> &projectParts);
+    ProjectInfo(const ProjectInfo::ConstPtr &pi, const CppCodeModelSettings &settings);
 
     const QVector<ProjectPart::ConstPtr> m_projectParts;
     const QString m_projectName;
@@ -54,6 +59,7 @@ private:
     const ProjectExplorer::HeaderPaths m_headerPaths;
     const QSet<Utils::FilePath> m_sourceFiles;
     const ProjectExplorer::Macros m_defines;
+    const CppCodeModelSettings m_settings;
 };
 
 using ProjectInfoList = QList<ProjectInfo::ConstPtr>;
diff --git a/src/plugins/projectexplorer/rawprojectpart.cpp b/src/plugins/projectexplorer/rawprojectpart.cpp
index 3f525ea095..9bb69c5e84 100644
--- a/src/plugins/projectexplorer/rawprojectpart.cpp
+++ b/src/plugins/projectexplorer/rawprojectpart.cpp
@@ -178,6 +178,12 @@ ToolchainInfo::ToolchainInfo(const Toolchain *toolChain,
     }
 }
 
+static CppSettingsRetriever g_cppSettingsRetriever;
+void provideCppSettingsRetriever(const CppSettingsRetriever &retriever)
+{
+    g_cppSettingsRetriever = retriever;
+}
+
 ProjectUpdateInfo::ProjectUpdateInfo(Project *project,
                                      const KitInfo &kitInfo,
                                      const Utils::Environment &env,
@@ -188,6 +194,8 @@ ProjectUpdateInfo::ProjectUpdateInfo(Project *project,
     , cToolchainInfo(ToolchainInfo(kitInfo.cToolchain, kitInfo.sysRootPath, env))
     , cxxToolchainInfo(ToolchainInfo(kitInfo.cxxToolchain, kitInfo.sysRootPath, env))
 {
+    if (g_cppSettingsRetriever)
+        cppSettings = g_cppSettingsRetriever(project);
     if (project) {
         projectName = project->displayName();
         projectFilePath = project->projectFilePath();
diff --git a/src/plugins/projectexplorer/rawprojectpart.h b/src/plugins/projectexplorer/rawprojectpart.h
index 75503170da..7ebe5eed1d 100644
--- a/src/plugins/projectexplorer/rawprojectpart.h
+++ b/src/plugins/projectexplorer/rawprojectpart.h
@@ -14,6 +14,7 @@
 #include <utils/cpplanguage_details.h>
 #include <utils/environment.h>
 #include <utils/fileutils.h>
+#include <utils/store.h>
 
 #include <QPointer>
 
@@ -170,9 +171,13 @@ public:
     Utils::FilePath buildRoot;
     RawProjectParts rawProjectParts;
     RppGenerator rppGenerator;
+    Utils::Store cppSettings;
 
     ToolchainInfo cToolchainInfo;
     ToolchainInfo cxxToolchainInfo;
 };
 
+using CppSettingsRetriever = std::function<Utils::Store(const Project *)>;
+void PROJECTEXPLORER_EXPORT provideCppSettingsRetriever(const CppSettingsRetriever &retriever);
+
 } // namespace ProjectExplorer