ClangTools: Allow selecting diagnostic config for project

When starting the Clazy/Tidy tool, allow to select the diagnostic
configuration for the run.

As a side effect, fix a race condition where the runner could end up
with no diagnostic config (removed during run) - copy the diagnostic
config instead of referencing/querying it by the id.

Change-Id: Iedafa8f31a3bbd233d65818fe8de16add1e4d443
Reviewed-by: Ivan Donchevskii <ivan.donchevskii@qt.io>

12 files changed, 206 insertions, 25 deletions

diff --git a/src/plugins/clangtools/clangselectablefilesdialog.cpp b/src/plugins/clangtools/clangselectablefilesdialog.cpp
index b6544efb15..4dab13a726 100644
--- a/src/plugins/clangtools/clangselectablefilesdialog.cpp
+++ b/src/plugins/clangtools/clangselectablefilesdialog.cpp
@@ -27,6 +27,7 @@
 #include "ui_clangselectablefilesdialog.h"
 
 #include "clangtoolsprojectsettings.h"
+#include "clangtoolssettings.h"
 #include "clangtoolsutils.h"
 
 #include <cpptools/compileroptionsbuilder.h>
@@ -262,6 +263,8 @@ private:
     }
 };
 
+enum { GlobalSettings , CustomSettings };
+
 SelectableFilesDialog::SelectableFilesDialog(const ProjectInfo &projectInfo,
                                              const FileInfos &allFileInfos)
     : QDialog(nullptr)
@@ -278,8 +281,42 @@ SelectableFilesDialog::SelectableFilesDialog(const ProjectInfo &projectInfo,
     m_ui->buttons->setStandardButtons(QDialogButtonBox::Cancel);
     m_ui->buttons->addButton(m_analyzeButton, QDialogButtonBox::AcceptRole);
 
-    // Restore selection
+    m_ui->diagnosticConfigsSelectionWidget->showLabel(false);
+
     ClangToolsProjectSettings *settings = ClangToolsProjectSettingsManager::getSettings(m_project);
+
+    Core::Id diagnosticConfig;
+    if (settings->useGlobalSettings()) {
+        m_ui->globalOrCustom->setCurrentIndex(GlobalSettings);
+        m_ui->diagnosticConfigsSelectionWidget->setEnabled(false);
+        diagnosticConfig = ClangToolsSettings::instance()->savedDiagnosticConfigId();
+    } else {
+        m_ui->globalOrCustom->setCurrentIndex(CustomSettings);
+        m_ui->diagnosticConfigsSelectionWidget->setEnabled(true);
+        diagnosticConfig = settings->diagnosticConfig();
+    }
+    m_customDiagnosticConfig = diagnosticConfig;
+    m_ui->diagnosticConfigsSelectionWidget->refresh(diagnosticConfig);
+
+    connect(m_ui->globalOrCustom,
+            static_cast<void (QComboBox::*)(int)>(&QComboBox::currentIndexChanged),
+            [this](int index){
+        m_ui->diagnosticConfigsSelectionWidget->setEnabled(index == CustomSettings);
+        if (index == CustomSettings) {
+            m_ui->diagnosticConfigsSelectionWidget->refresh(m_customDiagnosticConfig);
+        } else {
+            m_ui->diagnosticConfigsSelectionWidget->refresh(
+                ClangToolsSettings::instance()->savedDiagnosticConfigId());
+        }
+    });
+    connect(m_ui->diagnosticConfigsSelectionWidget,
+            &ClangDiagnosticConfigsSelectionWidget::currentConfigChanged,
+            [this](const Core::Id &currentConfigId) {
+        if (m_ui->globalOrCustom->currentIndex() == CustomSettings)
+            m_customDiagnosticConfig = currentConfigId;
+    });
+
+    // Restore selection
     if (settings->selectedDirs().isEmpty() && settings->selectedFiles().isEmpty())
         m_filesModel->selectAllFiles(); // Initially, all files are selected
     else // Restore selection
@@ -300,11 +337,16 @@ FileInfos SelectableFilesDialog::filteredFileInfos() const
 
 void SelectableFilesDialog::accept()
 {
+    ClangToolsProjectSettings *settings = ClangToolsProjectSettingsManager::getSettings(m_project);
+
+    // Save diagnostic configuration
+    settings->setUseGlobalSettings(m_ui->globalOrCustom->currentIndex() == GlobalSettings);
+    settings->setDiagnosticConfig(m_customDiagnosticConfig);
+
     // Save selection
     QSet<FileName> checkedDirs;
     QSet<FileName> checkedFiles;
     m_filesModel->minimalSelection(checkedDirs, checkedFiles);
-    ClangToolsProjectSettings *settings = ClangToolsProjectSettingsManager::getSettings(m_project);
     settings->setSelectedDirs(checkedDirs);
     settings->setSelectedFiles(checkedFiles);
 
diff --git a/src/plugins/clangtools/clangselectablefilesdialog.h b/src/plugins/clangtools/clangselectablefilesdialog.h
index ec4f093d4b..e639d06199 100644
--- a/src/plugins/clangtools/clangselectablefilesdialog.h
+++ b/src/plugins/clangtools/clangselectablefilesdialog.h
@@ -27,6 +27,8 @@
 
 #include "clangfileinfo.h"
 
+#include <coreplugin/id.h>
+
 #include <QDialog>
 
 #include <memory>
@@ -60,6 +62,7 @@ private:
     std::unique_ptr<Ui::SelectableFilesDialog> m_ui;
     std::unique_ptr<SelectableFilesModel> m_filesModel;
 
+    Core::Id m_customDiagnosticConfig;
     ProjectExplorer::Project *m_project;
     QPushButton *m_analyzeButton = nullptr;
 };
diff --git a/src/plugins/clangtools/clangselectablefilesdialog.ui b/src/plugins/clangtools/clangselectablefilesdialog.ui
index 16d620cd7c..69af94c4c6 100644
--- a/src/plugins/clangtools/clangselectablefilesdialog.ui
+++ b/src/plugins/clangtools/clangselectablefilesdialog.ui
@@ -11,14 +11,55 @@
    </rect>
   </property>
   <property name="windowTitle">
-   <string>Select the Files to Analyze</string>
+   <string>Analyzer Configuration</string>
   </property>
   <layout class="QVBoxLayout" name="verticalLayout">
    <item>
-    <widget class="QTreeView" name="filesView">
-     <property name="headerHidden">
-      <bool>true</bool>
+    <widget class="QGroupBox" name="groupBox">
+     <property name="title">
+      <string>Diagnostic Configuration</string>
      </property>
+     <property name="checkable">
+      <bool>false</bool>
+     </property>
+     <property name="checked">
+      <bool>false</bool>
+     </property>
+     <layout class="QHBoxLayout" name="horizontalLayout">
+      <item>
+       <widget class="QComboBox" name="globalOrCustom">
+        <item>
+         <property name="text">
+          <string>Global</string>
+         </property>
+        </item>
+        <item>
+         <property name="text">
+          <string>Custom</string>
+         </property>
+        </item>
+       </widget>
+      </item>
+      <item>
+       <widget class="CppTools::ClangDiagnosticConfigsSelectionWidget" name="diagnosticConfigsSelectionWidget" native="true"/>
+      </item>
+     </layout>
+    </widget>
+   </item>
+   <item>
+    <widget class="QGroupBox" name="groupBox_2">
+     <property name="title">
+      <string>Files to Analyze</string>
+     </property>
+     <layout class="QVBoxLayout" name="verticalLayout_2">
+      <item>
+       <widget class="QTreeView" name="filesView">
+        <property name="headerHidden">
+         <bool>true</bool>
+        </property>
+       </widget>
+      </item>
+     </layout>
     </widget>
    </item>
    <item>
@@ -33,6 +74,13 @@
    </item>
   </layout>
  </widget>
+ <customwidgets>
+  <customwidget>
+   <class>CppTools::ClangDiagnosticConfigsSelectionWidget</class>
+   <extends>QWidget</extends>
+   <header>cpptools/clangdiagnosticconfigsselectionwidget.h</header>
+  </customwidget>
+ </customwidgets>
  <resources/>
  <connections>
   <connection>
diff --git a/src/plugins/clangtools/clangtidyclazyruncontrol.cpp b/src/plugins/clangtools/clangtidyclazyruncontrol.cpp
index 44fcf746df..12f158ae68 100644
--- a/src/plugins/clangtools/clangtidyclazyruncontrol.cpp
+++ b/src/plugins/clangtools/clangtidyclazyruncontrol.cpp
@@ -33,10 +33,13 @@ using namespace ProjectExplorer;
 namespace ClangTools {
 namespace Internal {
 
-ClangTidyClazyRunControl::ClangTidyClazyRunControl(RunControl *runControl,
-                                                   Target *target,
-                                                   const FileInfos &fileInfos)
+ClangTidyClazyRunControl::ClangTidyClazyRunControl(
+    RunControl *runControl,
+    Target *target,
+    const CppTools::ClangDiagnosticConfig &diagnosticConfig,
+    const FileInfos &fileInfos)
     : ClangToolRunControl(runControl, target, fileInfos)
+    , m_diagnosticConfig(diagnosticConfig)
 {
     setDisplayName("ClangTidyClazyRunner");
     init();
@@ -47,7 +50,8 @@ ClangToolRunner *ClangTidyClazyRunControl::createRunner()
     QTC_ASSERT(!m_clangExecutable.isEmpty(), return 0);
     QTC_ASSERT(!m_clangLogFileDir.isEmpty(), return 0);
 
-    auto runner = new ClangTidyClazyRunner(m_clangExecutable,
+    auto runner = new ClangTidyClazyRunner(m_diagnosticConfig,
+                                           m_clangExecutable,
                                            m_clangLogFileDir,
                                            m_environment,
                                            this);
diff --git a/src/plugins/clangtools/clangtidyclazyruncontrol.h b/src/plugins/clangtools/clangtidyclazyruncontrol.h
index 4cc2b39ddc..b0dfafef6a 100644
--- a/src/plugins/clangtools/clangtidyclazyruncontrol.h
+++ b/src/plugins/clangtools/clangtidyclazyruncontrol.h
@@ -27,6 +27,8 @@
 
 #include "clangtoolruncontrol.h"
 
+#include <cpptools/clangdiagnosticconfig.h>
+
 namespace ClangTools {
 namespace Internal {
 
@@ -37,11 +39,15 @@ class ClangTidyClazyRunControl final : public ClangToolRunControl
 public:
     ClangTidyClazyRunControl(ProjectExplorer::RunControl *runControl,
                              ProjectExplorer::Target *target,
+                             const CppTools::ClangDiagnosticConfig &diagnosticConfig,
                              const FileInfos &fileInfos);
 
 protected:
     ClangToolRunner *createRunner() final;
     ClangTool *tool() final;
+
+private:
+    CppTools::ClangDiagnosticConfig m_diagnosticConfig;
 };
 
 } // namespace Internal
diff --git a/src/plugins/clangtools/clangtidyclazyrunner.cpp b/src/plugins/clangtools/clangtidyclazyrunner.cpp
index 83094fe349..71cbc78bec 100644
--- a/src/plugins/clangtools/clangtidyclazyrunner.cpp
+++ b/src/plugins/clangtools/clangtidyclazyrunner.cpp
@@ -42,7 +42,8 @@ static Q_LOGGING_CATEGORY(LOG, "qtc.clangtools.runner")
 namespace ClangTools {
 namespace Internal {
 
-ClangTidyClazyRunner::ClangTidyClazyRunner(const QString &clangExecutable,
+ClangTidyClazyRunner::ClangTidyClazyRunner(const CppTools::ClangDiagnosticConfig &diagnosticConfig,
+                                           const QString &clangExecutable,
                                            const QString &clangLogFileDir,
                                            const Utils::Environment &environment,
                                            QObject *parent)
@@ -51,6 +52,7 @@ ClangTidyClazyRunner::ClangTidyClazyRunner(const QString &clangExecutable,
                       environment,
                       tr("Clang-Tidy and Clazy"),
                       parent)
+    , m_diagnosticConfig(diagnosticConfig)
 {
 }
 
@@ -78,28 +80,21 @@ QStringList ClangTidyClazyRunner::constructCommandLineArguments(const QStringLis
               << QString("-serialize-diagnostics")
               << QString(m_logFile);
 
-    const ClangDiagnosticConfigsModel configsModel(
-                CppTools::codeModelSettings()->clangCustomDiagnosticConfigs());
-    const Core::Id configId = ClangToolsSettings::instance()->savedDiagnosticConfigId();
-    QTC_ASSERT(configsModel.hasConfigWithId(configId), return arguments;);
-
-    const ClangDiagnosticConfig &config = configsModel.configWithId(configId);
-
-    const ClangDiagnosticConfig::TidyMode tidyMode = config.clangTidyMode();
+    const ClangDiagnosticConfig::TidyMode tidyMode = m_diagnosticConfig.clangTidyMode();
     if (tidyMode != ClangDiagnosticConfig::TidyMode::Disabled) {
         addXclangArg(arguments, QString("-add-plugin"), QString("clang-tidy"));
         if (tidyMode != ClangDiagnosticConfig::TidyMode::File) {
-            const QString tidyChecks = config.clangTidyChecks();
+            const QString tidyChecks = m_diagnosticConfig.clangTidyChecks();
             addXclangArg(arguments, QString("-plugin-arg-clang-tidy"), "-checks=" + tidyChecks);
         }
     }
 
-    const QString clazyChecks = config.clazyChecks();
+    const QString clazyChecks = m_diagnosticConfig.clazyChecks();
     if (!clazyChecks.isEmpty()) {
         addXclangArg(arguments, QString("-add-plugin"), QString("clang-lazy"));
         addXclangArg(arguments, QString("-plugin-arg-clang-lazy"), QString("enable-all-fixits"));
         addXclangArg(arguments, QString("-plugin-arg-clang-lazy"), QString("no-autowrite-fixits"));
-        addXclangArg(arguments, QString("-plugin-arg-clang-lazy"), config.clazyChecks());
+        addXclangArg(arguments, QString("-plugin-arg-clang-lazy"), m_diagnosticConfig.clazyChecks());
     }
 
     arguments += options;
diff --git a/src/plugins/clangtools/clangtidyclazyrunner.h b/src/plugins/clangtools/clangtidyclazyrunner.h
index e723653192..507ac2977d 100644
--- a/src/plugins/clangtools/clangtidyclazyrunner.h
+++ b/src/plugins/clangtools/clangtidyclazyrunner.h
@@ -25,6 +25,8 @@
 
 #pragma once
 
+#include <cpptools/clangdiagnosticconfig.h>
+
 #include "clangtoolrunner.h"
 
 namespace ClangTools {
@@ -35,12 +37,17 @@ class ClangTidyClazyRunner final : public ClangToolRunner
     Q_OBJECT
 
 public:
-    ClangTidyClazyRunner(const QString &clangExecutable,
+    ClangTidyClazyRunner(const CppTools::ClangDiagnosticConfig &diagnosticConfig,
+                         const QString &clangExecutable,
                          const QString &clangLogFileDir,
                          const Utils::Environment &environment,
                          QObject *parent = nullptr);
+
 protected:
     QStringList constructCommandLineArguments(const QStringList &options) final;
+
+private:
+    const CppTools::ClangDiagnosticConfig m_diagnosticConfig;
 };
 
 } // namespace Internal
diff --git a/src/plugins/clangtools/clangtidyclazytool.cpp b/src/plugins/clangtools/clangtidyclazytool.cpp
index 51236d98d3..ab922e2c4d 100644
--- a/src/plugins/clangtools/clangtidyclazytool.cpp
+++ b/src/plugins/clangtools/clangtidyclazytool.cpp
@@ -31,11 +31,16 @@
 #include "clangtoolslogfilereader.h"
 #include "clangtidyclazyruncontrol.h"
 #include "clangtoolsdiagnosticview.h"
+#include "clangtoolsprojectsettings.h"
+#include "clangtoolssettings.h"
 
 #include <coreplugin/actionmanager/actioncontainer.h>
 #include <coreplugin/actionmanager/actionmanager.h>
 
+#include <cpptools/clangdiagnosticconfigsmodel.h>
+#include <cpptools/cppcodemodelsettings.h>
 #include <cpptools/cppmodelmanager.h>
+#include <cpptools/cpptoolsreuse.h>
 
 #include <debugger/analyzer/analyzermanager.h>
 
@@ -50,6 +55,7 @@
 #include <QAction>
 
 using namespace Core;
+using namespace CppTools;
 using namespace Debugger;
 using namespace ProjectExplorer;
 using namespace Utils;
@@ -140,6 +146,24 @@ ClangTidyClazyTool *ClangTidyClazyTool::instance()
     return s_instance;
 }
 
+static ClangDiagnosticConfig getDiagnosticConfig(Project *project)
+{
+    ClangToolsProjectSettings *projectSettings = ClangToolsProjectSettingsManager::getSettings(
+        project);
+
+    Core::Id diagnosticConfigId;
+    if (projectSettings->useGlobalSettings())
+        diagnosticConfigId = ClangToolsSettings::instance()->savedDiagnosticConfigId();
+    else
+        diagnosticConfigId = projectSettings->diagnosticConfig();
+
+    const ClangDiagnosticConfigsModel configsModel(
+                CppTools::codeModelSettings()->clangCustomDiagnosticConfigs());
+
+    QTC_ASSERT(configsModel.hasConfigWithId(diagnosticConfigId), return ClangDiagnosticConfig());
+    return configsModel.configWithId(diagnosticConfigId);
+}
+
 void ClangTidyClazyTool::startTool(bool askUserForFileSelection)
 {
     auto runControl = new RunControl(nullptr, Constants::CLANGTIDYCLAZY_RUN_MODE);
@@ -153,7 +177,10 @@ void ClangTidyClazyTool::startTool(bool askUserForFileSelection)
     if (fileInfos.isEmpty())
         return;
 
-    auto clangTool = new ClangTidyClazyRunControl(runControl, project->activeTarget(), fileInfos);
+    auto clangTool = new ClangTidyClazyRunControl(runControl,
+                                                  project->activeTarget(),
+                                                  getDiagnosticConfig(project),
+                                                  fileInfos);
 
     m_stopAction->disconnect();
     connect(m_stopAction, &QAction::triggered, runControl, [runControl] {
diff --git a/src/plugins/clangtools/clangtoolsprojectsettings.cpp b/src/plugins/clangtools/clangtoolsprojectsettings.cpp
index d6c87bd876..4622afe2c4 100644
--- a/src/plugins/clangtools/clangtoolsprojectsettings.cpp
+++ b/src/plugins/clangtools/clangtoolsprojectsettings.cpp
@@ -34,6 +34,8 @@
 namespace ClangTools {
 namespace Internal {
 
+static const char SETTINGS_KEY_USE_GLOBAL_SETTINGS[] = "ClangTools.UseGlobalSettings";
+static const char SETTINGS_KEY_DIAGNOSTIC_CONFIG[] = "ClangTools.DiagnosticConfig";
 static const char SETTINGS_KEY_SELECTED_DIRS[] = "ClangTools.SelectedDirs";
 static const char SETTINGS_KEY_SELECTED_FILES[] = "ClangTools.SelectedFiles";
 static const char SETTINGS_KEY_SUPPRESSED_DIAGS[] = "ClangTools.SuppressedDiagnostics";
@@ -80,6 +82,11 @@ void ClangToolsProjectSettings::removeAllSuppressedDiagnostics()
 
 void ClangToolsProjectSettings::load()
 {
+    const QVariant useGlobalVariant =  m_project->namedSettings(SETTINGS_KEY_USE_GLOBAL_SETTINGS);
+    m_useGlobalSettings = useGlobalVariant.isValid() ? useGlobalVariant.toBool() : true;
+    m_diagnosticConfig = Core::Id::fromSetting(
+        m_project->namedSettings(SETTINGS_KEY_DIAGNOSTIC_CONFIG));
+
     auto toFileName = [](const QString &s) { return Utils::FileName::fromString(s); };
 
     const QStringList dirs = m_project->namedSettings(SETTINGS_KEY_SELECTED_DIRS).toStringList();
@@ -115,6 +122,9 @@ void ClangToolsProjectSettings::load()
 
 void ClangToolsProjectSettings::store()
 {
+    m_project->setNamedSettings(SETTINGS_KEY_USE_GLOBAL_SETTINGS, m_useGlobalSettings);
+    m_project->setNamedSettings(SETTINGS_KEY_DIAGNOSTIC_CONFIG, m_diagnosticConfig.toSetting());
+
     const QStringList dirs = Utils::transform(m_selectedDirs.toList(), &Utils::FileName::toString);
     m_project->setNamedSettings(SETTINGS_KEY_SELECTED_DIRS, dirs);
 
@@ -134,6 +144,26 @@ void ClangToolsProjectSettings::store()
     m_project->setNamedSettings(SETTINGS_KEY_SUPPRESSED_DIAGS, list);
 }
 
+bool ClangToolsProjectSettings::useGlobalSettings() const
+{
+    return m_useGlobalSettings;
+}
+
+void ClangToolsProjectSettings::setUseGlobalSettings(bool useGlobalSettings)
+{
+    m_useGlobalSettings = useGlobalSettings;
+}
+
+Core::Id ClangToolsProjectSettings::diagnosticConfig() const
+{
+    return m_diagnosticConfig;
+}
+
+void ClangToolsProjectSettings::setDiagnosticConfig(const Core::Id &diagnosticConfig)
+{
+    m_diagnosticConfig = diagnosticConfig;
+}
+
 ClangToolsProjectSettingsManager::ClangToolsProjectSettingsManager()
 {
     QObject::connect(ProjectExplorer::SessionManager::instance(),
diff --git a/src/plugins/clangtools/clangtoolsprojectsettings.h b/src/plugins/clangtools/clangtoolsprojectsettings.h
index d29c0405d7..659a7b5648 100644
--- a/src/plugins/clangtools/clangtoolsprojectsettings.h
+++ b/src/plugins/clangtools/clangtoolsprojectsettings.h
@@ -27,6 +27,7 @@
 
 #include <QObject>
 
+#include <coreplugin/id.h>
 #include <projectexplorer/project.h>
 
 #include <utils/fileutils.h>
@@ -74,6 +75,12 @@ public:
     ClangToolsProjectSettings(ProjectExplorer::Project *project);
     ~ClangToolsProjectSettings() override;
 
+    bool useGlobalSettings() const;
+    void setUseGlobalSettings(bool useGlobalSettings);
+
+    Core::Id diagnosticConfig() const;
+    void setDiagnosticConfig(const Core::Id &diagnosticConfig);
+
     QSet<Utils::FileName> selectedDirs() const { return m_selectedDirs; }
     void setSelectedDirs(const QSet<Utils::FileName> &value) { m_selectedDirs = value; }
 
@@ -93,6 +100,8 @@ private:
     void store();
 
     ProjectExplorer::Project *m_project;
+    bool m_useGlobalSettings = true;
+    Core::Id m_diagnosticConfig;
     QSet<Utils::FileName> m_selectedDirs;
     QSet<Utils::FileName> m_selectedFiles;
     SuppressedDiagnosticsList m_suppressedDiagnostics;
diff --git a/src/plugins/cpptools/clangdiagnosticconfigsselectionwidget.cpp b/src/plugins/cpptools/clangdiagnosticconfigsselectionwidget.cpp
index d4efc67f5a..17df43705f 100644
--- a/src/plugins/cpptools/clangdiagnosticconfigsselectionwidget.cpp
+++ b/src/plugins/cpptools/clangdiagnosticconfigsselectionwidget.cpp
@@ -69,12 +69,13 @@ static void connectToClangDiagnosticConfigsDialog(QPushButton *button)
 
 ClangDiagnosticConfigsSelectionWidget::ClangDiagnosticConfigsSelectionWidget(QWidget *parent)
     : QWidget(parent)
+    , m_label(new QLabel(tr("Diagnostic Configuration:"), this))
     , m_selectionComboBox(new QComboBox(this))
 {
     auto *layout = new QHBoxLayout(this);
     layout->setMargin(0);
     setLayout(layout);
-    layout->addWidget(new QLabel(tr("Diagnostic Configuration:"), this));
+    layout->addWidget(m_label);
     layout->addWidget(m_selectionComboBox);
     auto *manageButton = new QPushButton(tr("Manage..."), this);
     layout->addWidget(manageButton);
@@ -133,4 +134,9 @@ void ClangDiagnosticConfigsSelectionWidget::refresh(Core::Id id)
     connectToCurrentIndexChanged();
 }
 
+void ClangDiagnosticConfigsSelectionWidget::showLabel(bool show)
+{
+    m_label->setVisible(show);
+}
+
 } // CppTools namespace
diff --git a/src/plugins/cpptools/clangdiagnosticconfigsselectionwidget.h b/src/plugins/cpptools/clangdiagnosticconfigsselectionwidget.h
index abcdacf365..f8cff89edc 100644
--- a/src/plugins/cpptools/clangdiagnosticconfigsselectionwidget.h
+++ b/src/plugins/cpptools/clangdiagnosticconfigsselectionwidget.h
@@ -33,6 +33,7 @@
 
 QT_BEGIN_NAMESPACE
 class QComboBox;
+class QLabel;
 QT_END_NAMESPACE
 
 namespace CppTools {
@@ -48,6 +49,8 @@ public:
 
     void refresh(Core::Id id);
 
+    void showLabel(bool show);
+
 signals:
     void currentConfigChanged(const Core::Id &currentConfigId);
 
@@ -58,6 +61,7 @@ private:
     QMetaObject::Connection m_currentIndexChangedConnection;
     ClangDiagnosticConfigsModel m_diagnosticConfigsModel;
 
+    QLabel *m_label = nullptr;
     QComboBox *m_selectionComboBox = nullptr;
 };