diff --git a/src/plugins/cmakeprojectmanager/builddirmanager.cpp b/src/plugins/cmakeprojectmanager/builddirmanager.cpp
index a8b5e0b56a1..3e082fec103 100644
--- a/src/plugins/cmakeprojectmanager/builddirmanager.cpp
+++ b/src/plugins/cmakeprojectmanager/builddirmanager.cpp
@@ -375,41 +375,40 @@ bool BuildDirManager::checkConfiguration()
         return false; // No cache file yet.
 
     CMakeConfig newConfig;
-    QSet<QString> changedKeys;
-    QSet<QString> removedKeys;
-    foreach (const CMakeConfigItem &iBc, m_parameters.configuration) {
-        const CMakeConfigItem &iCache
-                = Utils::findOrDefault(cache, [&iBc](const CMakeConfigItem &i) { return i.key == iBc.key; });
-        if (iCache.isNull()) {
-            removedKeys << QString::fromUtf8(iBc.key);
-        } else if (QString::fromUtf8(iCache.value) != iBc.expandedValue(m_parameters.expander)) {
-            changedKeys << QString::fromUtf8(iBc.key);
-            newConfig.append(iCache);
+    QHash<QString, QPair<QString, QString>> changedKeys;
+    foreach (const CMakeConfigItem &projectItem, m_parameters.configuration) {
+        const QString projectKey = QString::fromUtf8(projectItem.key);
+        const QString projectValue = projectItem.expandedValue(m_parameters.expander);
+        const CMakeConfigItem &cmakeItem
+                = Utils::findOrDefault(cache, [&projectItem](const CMakeConfigItem &i) { return i.key == projectItem.key; });
+        const QString iCacheValue = QString::fromUtf8(cmakeItem.value);
+        if (cmakeItem.isNull()) {
+            changedKeys.insert(projectKey, qMakePair(tr("<removed>"), projectValue));
+        } else if (iCacheValue != projectValue) {
+            changedKeys.insert(projectKey, qMakePair(iCacheValue, projectValue));
+            newConfig.append(cmakeItem);
         } else {
-            newConfig.append(iBc);
+            newConfig.append(projectItem);
         }
     }
 
-    if (!changedKeys.isEmpty() || !removedKeys.isEmpty()) {
-        QSet<QString> total = removedKeys + changedKeys;
-        QStringList keyList = total.toList();
+    if (!changedKeys.isEmpty()) {
+        QStringList keyList = changedKeys.keys();
         Utils::sort(keyList);
-        QString table = QLatin1String("<table>");
+        QString table = QString::fromLatin1("<table><tr><th>%1</th><th>%2</th><th>%3</th></tr>")
+                .arg(tr("Key")).arg(tr("CMake")).arg(tr("Project"));
         foreach (const QString &k, keyList) {
-            QString change;
-            if (removedKeys.contains(k))
-                change = tr("<removed>");
-            else
-                change = QString::fromUtf8(CMakeConfigItem::valueOf(k.toUtf8(), cache)).trimmed();
-            if (change.isEmpty())
-                change = tr("<empty>");
-            table += QString::fromLatin1("\n<tr><td>%1</td><td>%2</td></tr>").arg(k).arg(change.toHtmlEscaped());
+            const QPair<QString, QString> data = changedKeys.value(k);
+            table += QString::fromLatin1("\n<tr><td>%1</td><td>%2</td><td>%3</td></tr>")
+                    .arg(k)
+                    .arg(data.first.toHtmlEscaped())
+                    .arg(data.second.toHtmlEscaped());
         }
         table += QLatin1String("\n</table>");
 
         QPointer<QMessageBox> box = new QMessageBox(Core::ICore::mainWindow());
         box->setText(tr("CMake configuration has changed on disk."));
-        box->setInformativeText(tr("The CMakeCache.txt file has changed: %1").arg(table));
+        box->setInformativeText(table);
         auto *defaultButton = box->addButton(tr("Overwrite Changes in CMake"), QMessageBox::RejectRole);
         auto *applyButton = box->addButton(tr("Apply Changes to Project"), QMessageBox::ApplyRole);
         box->setDefaultButton(defaultButton);
diff --git a/src/plugins/cmakeprojectmanager/cmakebuildsettingswidget.cpp b/src/plugins/cmakeprojectmanager/cmakebuildsettingswidget.cpp
index 0abe72fd7d9..6813b234a45 100644
--- a/src/plugins/cmakeprojectmanager/cmakebuildsettingswidget.cpp
+++ b/src/plugins/cmakeprojectmanager/cmakebuildsettingswidget.cpp
@@ -286,7 +286,7 @@ CMakeBuildSettingsWidget::CMakeBuildSettingsWidget(CMakeBuildConfiguration *bc)
 
     connect(m_resetButton, &QPushButton::clicked, m_configModel, &ConfigModel::resetAllChanges);
     connect(m_reconfigureButton, &QPushButton::clicked, this, [this]() {
-        m_buildConfiguration->setConfigurationForCMake(m_configModel->configurationChanges());
+        m_buildConfiguration->setConfigurationForCMake(m_configModel->configurationForCMake());
     });
     connect(m_unsetButton, &QPushButton::clicked, this, [this]() {
         m_configModel->toggleUnsetFlag(mapToSource(m_configView, m_configView->currentIndex()));
@@ -320,7 +320,12 @@ CMakeBuildSettingsWidget::CMakeBuildSettingsWidget(CMakeBuildConfiguration *bc)
     connect(m_buildConfiguration->target(), &ProjectExplorer::Target::kitChanged,
             this, &CMakeBuildSettingsWidget::updateFromKit);
     connect(m_buildConfiguration, &CMakeBuildConfiguration::enabledChanged,
-            this, [this]() { setError(m_buildConfiguration->disabledReason()); });
+            this, [this]() {
+        setError(m_buildConfiguration->disabledReason());
+        setConfigurationForCMake();
+    });
+    connect(m_buildConfiguration, &CMakeBuildConfiguration::configurationForCMakeChanged,
+            this, [this]() { setConfigurationForCMake(); });
 
     updateSelection(QModelIndex(), QModelIndex());
 }
@@ -381,7 +386,19 @@ void CMakeBuildSettingsWidget::updateFromKit()
     for (const CMakeConfigItem &i : config)
         configHash.insert(QString::fromUtf8(i.key), i.expandedValue(k));
 
-    m_configModel->setKitConfiguration(configHash);
+    m_configModel->setConfigurationFromKit(configHash);
+}
+
+void CMakeBuildSettingsWidget::setConfigurationForCMake()
+{
+    QHash<QString, QString> config;
+    const CMakeConfig configList = m_buildConfiguration->configurationForCMake();
+    for (const CMakeConfigItem &i : configList) {
+        config.insert(QString::fromUtf8(i.key),
+                      CMakeConfigItem::expandedValueOf(m_buildConfiguration->target()->kit(),
+                                                       i.key, configList));
+    }
+    m_configModel->setConfigurationForCMake(config);
 }
 
 void CMakeBuildSettingsWidget::updateSelection(const QModelIndex &current, const QModelIndex &previous)
diff --git a/src/plugins/cmakeprojectmanager/cmakebuildsettingswidget.h b/src/plugins/cmakeprojectmanager/cmakebuildsettingswidget.h
index 6d422dfe1e7..b205d20f770 100644
--- a/src/plugins/cmakeprojectmanager/cmakebuildsettingswidget.h
+++ b/src/plugins/cmakeprojectmanager/cmakebuildsettingswidget.h
@@ -65,6 +65,7 @@ private:
     void updateAdvancedCheckBox();
     void updateFromKit();
 
+    void setConfigurationForCMake();
     void updateSelection(const QModelIndex &current, const QModelIndex &previous);
     QAction *createForceAction(int type, const QModelIndex &idx);
 
diff --git a/src/plugins/cmakeprojectmanager/configmodel.cpp b/src/plugins/cmakeprojectmanager/configmodel.cpp
index 7abb52ee5d6..dbd654a1035 100644
--- a/src/plugins/cmakeprojectmanager/configmodel.cpp
+++ b/src/plugins/cmakeprojectmanager/configmodel.cpp
@@ -94,13 +94,30 @@ void ConfigModel::setConfiguration(const QList<DataItem> &config)
     setConfiguration(Utils::transform(config, [](const DataItem &di) { return InternalDataItem(di); }));
 }
 
-void ConfigModel::setKitConfiguration(const QHash<QString, QString> &kitConfig)
+void ConfigModel::setConfigurationFromKit(const QHash<QString, QString> &kitConfig)
 {
     m_kitConfiguration = kitConfig;
 
     for (InternalDataItem &i : m_configuration) {
-        if (m_kitConfiguration.contains(i.key)) {
+        if (m_kitConfiguration.contains(i.key))
             i.kitValue = m_kitConfiguration.value(i.key);
+    }
+    setConfiguration(m_configuration);
+}
+
+void ConfigModel::setConfigurationForCMake(const QHash<QString, QString> &config)
+{
+    for (InternalDataItem &i : m_configuration) {
+        if (!config.contains(i.key))
+            continue;
+
+        const QString v = config.value(i.key);
+        if (i.value == v) {
+            i.newValue.clear();
+            i.isUserChanged = false;
+        } else {
+            i.newValue = v;
+            i.isUserChanged = true;
         }
     }
     setConfiguration(m_configuration);
@@ -202,7 +219,7 @@ ConfigModel::DataItem ConfigModel::dataItemFromIndex(const QModelIndex &idx)
     return DataItem();
 }
 
-QList<ConfigModel::DataItem> ConfigModel::configurationChanges() const
+QList<ConfigModel::DataItem> ConfigModel::configurationForCMake() const
 {
     const QList<InternalDataItem> tmp
             = Utils::filtered(m_configuration, [](const InternalDataItem &i) {
diff --git a/src/plugins/cmakeprojectmanager/configmodel.h b/src/plugins/cmakeprojectmanager/configmodel.h
index fbe9b1b0905..26f64d10a80 100644
--- a/src/plugins/cmakeprojectmanager/configmodel.h
+++ b/src/plugins/cmakeprojectmanager/configmodel.h
@@ -70,7 +70,8 @@ public:
                              const QStringList &values = QStringList());
     void setConfiguration(const CMakeConfig &config);
     void setConfiguration(const QList<DataItem> &config);
-    void setKitConfiguration(const QHash<QString, QString> &kitConfig);
+    void setConfigurationFromKit(const QHash<QString, QString> &kitConfig);
+    void setConfigurationForCMake(const QHash<QString, QString> &config);
     void flush();
     void resetAllChanges();
 
@@ -84,7 +85,7 @@ public:
 
     static DataItem dataItemFromIndex(const QModelIndex &idx);
 
-    QList<DataItem> configurationChanges() const;
+    QList<DataItem> configurationForCMake() const;
 
 
 private: