diff --git a/src/chatlog/content/broken.h b/src/chatlog/content/broken.h
index a7b271111..ab5534494 100644
--- a/src/chatlog/content/broken.h
+++ b/src/chatlog/content/broken.h
@@ -38,8 +38,8 @@ public:
     qreal getAscent() const override;
 
 private:
-    QSize size;
     QPixmap pmap;
+    QSize size;
 };
 
 #endif // BROKEN_H
diff --git a/src/chatlog/content/filetransferwidget.cpp b/src/chatlog/content/filetransferwidget.cpp
index 3a205f4c7..6f611986a 100644
--- a/src/chatlog/content/filetransferwidget.cpp
+++ b/src/chatlog/content/filetransferwidget.cpp
@@ -86,8 +86,6 @@ FileTransferWidget::FileTransferWidget(QWidget* parent, ToxFile file)
         update();
     });
 
-    CoreFile* coreFile = Core::getInstance()->getCoreFile();
-
     connect(ui->leftButton, &QPushButton::clicked, this, &FileTransferWidget::onLeftButtonClicked);
     connect(ui->rightButton, &QPushButton::clicked, this, &FileTransferWidget::onRightButtonClicked);
     connect(ui->previewButton, &QPushButton::clicked, this,
diff --git a/src/core/core.cpp b/src/core/core.cpp
index 9e473bb59..888ca305c 100644
--- a/src/core/core.cpp
+++ b/src/core/core.cpp
@@ -805,7 +805,7 @@ void Core::bootstrapDht()
         QString dhtServerAddress = dhtServer.address.toLatin1();
         QString port = QString::number(dhtServer.port);
         QString name = dhtServer.name;
-        qDebug() << QString("Connecting to a bootstrap node...");
+        qDebug("Connecting to bootstrap node %d", j % listSize);
         QByteArray address = dhtServer.address.toLatin1();
         // TODO: constucting the pk via ToxId is a workaround
         ToxPk pk = ToxId{dhtServer.userId}.getPublicKey();
@@ -1651,7 +1651,7 @@ bool Core::hasFriendWithPublicKey(const ToxPk& publicKey) const
     }
 
     Tox_Err_Friend_By_Public_Key error;
-    uint32_t friendId = tox_friend_by_public_key(tox.get(), publicKey.getData(), &error);
+    (void)tox_friend_by_public_key(tox.get(), publicKey.getData(), &error);
     return PARSE_ERR(error);
 }
 
diff --git a/src/ipc.cpp b/src/ipc.cpp
index 36d4fb29b..2467b791b 100644
--- a/src/ipc.cpp
+++ b/src/ipc.cpp
@@ -24,8 +24,10 @@
 
 #include <ctime>
 #include <random>
-#include <unistd.h>
 #include <stdlib.h>
+#ifndef _MSC_VER
+#include <unistd.h>
+#endif
 
 namespace
 {
diff --git a/src/model/group.cpp b/src/model/group.cpp
index f08d4397d..d7a715142 100644
--- a/src/model/group.cpp
+++ b/src/model/group.cpp
@@ -34,13 +34,13 @@ static const int MAX_GROUP_TITLE_LENGTH = 128;
 
 Group::Group(int groupId, const GroupId persistentGroupId, const QString& name, bool isAvGroupchat,
              const QString& selfName, ICoreGroupQuery& groupQuery, ICoreIdHandler& idHandler)
-    : selfName{selfName}
+    : groupQuery(groupQuery)
+    , idHandler(idHandler)
+    , selfName{selfName}
     , title{name}
     , toxGroupNum(groupId)
     , groupId{persistentGroupId}
     , avGroupchat{isAvGroupchat}
-    , groupQuery(groupQuery)
-    , idHandler(idHandler)
 {
     // in groupchats, we only notify on messages containing your name <-- dumb
     // sound notifications should be on all messages, but system popup notification
diff --git a/src/model/message.h b/src/model/message.h
index 0dd9863b7..13783571c 100644
--- a/src/model/message.h
+++ b/src/model/message.h
@@ -108,7 +108,7 @@ public:
     inline void disableMentions()
     {
         detectingMentions = false;
-    };
+    }
 
 private:
     bool detectingMentions = false;
diff --git a/src/net/bootstrapnodeupdater.cpp b/src/net/bootstrapnodeupdater.cpp
index 347ec4f73..93454739a 100644
--- a/src/net/bootstrapnodeupdater.cpp
+++ b/src/net/bootstrapnodeupdater.cpp
@@ -185,7 +185,7 @@ QList<DhtServer> BootstrapNodeUpdater::jsonToNodeList(const QJsonDocument& nodeL
         return result;
     }
     QJsonArray nodes = rootObj[jsonNodeArrayName].toArray();
-    for (const auto& node : nodes) {
+    for (const QJsonValueRef node : nodes) {
         if (node.isObject()) {
             jsonNodeToDhtServer(node.toObject(), result);
         }
diff --git a/src/persistence/history.cpp b/src/persistence/history.cpp
index af438e178..895aba107 100644
--- a/src/persistence/history.cpp
+++ b/src/persistence/history.cpp
@@ -300,9 +300,6 @@ MessageState getMessageState(bool isPending, bool isBroken)
  * Caches mappings to speed up message saving.
  */
 
-static constexpr int NUM_MESSAGES_DEFAULT =
-    100; // arbitrary number of messages loaded when not loading by date
-
 FileDbInsertionData::FileDbInsertionData()
 {
     static int id = qRegisterMetaType<FileDbInsertionData>();
diff --git a/src/platform/autorun_osx.cpp b/src/platform/autorun_osx.cpp
index abb20f736..4c1c9cc97 100644
--- a/src/platform/autorun_osx.cpp
+++ b/src/platform/autorun_osx.cpp
@@ -24,7 +24,7 @@
 #include <QSettings>
 #include <QStandardPaths>
 
-int state;
+static int state;
 
 bool Platform::setAutorun(bool on)
 {
diff --git a/src/platform/camera/avfoundation.mm b/src/platform/camera/avfoundation.mm
index 32ff832f1..4d5ef09c5 100644
--- a/src/platform/camera/avfoundation.mm
+++ b/src/platform/camera/avfoundation.mm
@@ -33,7 +33,7 @@ QVector<QPair<QString, QString> > avfoundation::getDeviceList()
     }
 
     uint32_t numScreens = 0;
-    CGGetActiveDisplayList(0, NULL, &numScreens);
+    CGGetActiveDisplayList(0, nullptr, &numScreens);
     if (numScreens > 0) {
         CGDirectDisplayID screens[numScreens];
         CGGetActiveDisplayList(numScreens, screens, &numScreens);
diff --git a/src/platform/desktop_notifications/desktopnotify.cpp b/src/platform/desktop_notifications/desktopnotify.cpp
index 3ee9414f9..59b88dd38 100644
--- a/src/platform/desktop_notifications/desktopnotify.cpp
+++ b/src/platform/desktop_notifications/desktopnotify.cpp
@@ -17,6 +17,7 @@
     along with qTox.  If not, see <http://www.gnu.org/licenses/>.
 */
 
+#if DESKTOP_NOTIFICATIONS
 #include "desktopnotify.h"
 
 #include <src/persistence/settings.h>
@@ -75,3 +76,4 @@ void DesktopNotify::notifyMessageSimple(const MessageType type)
 
     createNotification(message, {}, snoreIcon);
 }
+#endif
diff --git a/src/platform/desktop_notifications/desktopnotify.h b/src/platform/desktop_notifications/desktopnotify.h
index 391598969..8c6565f9a 100644
--- a/src/platform/desktop_notifications/desktopnotify.h
+++ b/src/platform/desktop_notifications/desktopnotify.h
@@ -20,6 +20,7 @@
 #ifndef DESKTOPNOTIFY_H
 #define DESKTOPNOTIFY_H
 
+#if DESKTOP_NOTIFICATIONS
 #include <libsnore/snore.h>
 
 #include <QObject>
@@ -52,5 +53,6 @@ private:
     Snore::Application snoreApp;
     Snore::Icon snoreIcon;
 };
+#endif // DESKTOP_NOTIFICATIONS
 
 #endif // DESKTOPNOTIFY_H
diff --git a/src/widget/form/genericchatform.cpp b/src/widget/form/genericchatform.cpp
index 45f8dd805..08327871b 100644
--- a/src/widget/form/genericchatform.cpp
+++ b/src/widget/form/genericchatform.cpp
@@ -1120,9 +1120,9 @@ void GenericChatForm::renderMessages(ChatLogIdx begin, ChatLogIdx end,
         if (onCompletion) {
             auto connection = std::make_shared<QMetaObject::Connection>();
             *connection = connect(chatWidget, &ChatLog::workerTimeoutFinished,
-                                  [onCompletion, connection] {
+                                  [this, onCompletion, connection] {
                                       onCompletion();
-                                      disconnect(*connection);
+                                      this->disconnect(*connection);
                                   });
         }
 
diff --git a/src/widget/form/genericchatform.h b/src/widget/form/genericchatform.h
index 6f2005679..c100fdcab 100644
--- a/src/widget/form/genericchatform.h
+++ b/src/widget/form/genericchatform.h
@@ -54,7 +54,7 @@ class QToolButton;
 class QVBoxLayout;
 
 class IMessageDispatcher;
-class Message;
+struct Message;
 
 namespace Ui {
 class MainWindow;
diff --git a/src/widget/form/groupchatform.h b/src/widget/form/groupchatform.h
index 6329979b2..6cce22c96 100644
--- a/src/widget/form/groupchatform.h
+++ b/src/widget/form/groupchatform.h
@@ -33,7 +33,7 @@ class FlowLayout;
 class QTimer;
 class GroupId;
 class IMessageDispatcher;
-class Message;
+struct Message;
 
 class GroupChatForm : public GenericChatForm
 {
diff --git a/src/widget/form/loadhistorydialog.cpp b/src/widget/form/loadhistorydialog.cpp
index aceecb054..47b9aff5d 100644
--- a/src/widget/form/loadhistorydialog.cpp
+++ b/src/widget/form/loadhistorydialog.cpp
@@ -89,7 +89,6 @@ void LoadHistoryDialog::enableSearchMode()
 
 void LoadHistoryDialog::highlightDates(int year, int month)
 {
-    History* history = Nexus::getProfile()->getHistory();
     QDate monthStart(year, month, 1);
     QDate monthEnd(year, month + 1, 1);
 
diff --git a/src/widget/form/settings/avform.cpp b/src/widget/form/settings/avform.cpp
index df6a3f977..bcf5f8e3e 100644
--- a/src/widget/form/settings/avform.cpp
+++ b/src/widget/form/settings/avform.cpp
@@ -99,7 +99,6 @@ AVForm::AVForm(IAudioControl& audio, CoreAV* coreAV, CameraSource& camera,
 
     eventsInit();
 
-    QDesktopWidget* desktop = QApplication::desktop();
     for (QScreen* qScreen : QGuiApplication::screens()) {
         connect(qScreen, &QScreen::geometryChanged, this, &AVForm::rescanDevices);
     }
@@ -308,7 +307,7 @@ void AVForm::fillCameraModesComboBox()
 
         QString str;
         std::string pixelFormat = CameraDevice::getPixelFormatString(mode.pixel_format).toStdString();
-        qDebug("width: %d, height: %d, FPS: %f, pixel format: %s\n", mode.width, mode.height,
+        qDebug("width: %d, height: %d, FPS: %f, pixel format: %s", mode.width, mode.height,
                mode.FPS, pixelFormat.c_str());
 
         if (mode.height && mode.width) {
diff --git a/src/widget/friendwidget.cpp b/src/widget/friendwidget.cpp
index c03fac63f..6f65289c5 100644
--- a/src/widget/friendwidget.cpp
+++ b/src/widget/friendwidget.cpp
@@ -124,7 +124,7 @@ void FriendWidget::onContextMenuCalled(QContextMenuEvent* event)
     connect(newGroupAction, &QAction::triggered, chatroom.get(), &FriendChatroom::inviteToNewGroup);
     inviteMenu->addSeparator();
 
-    for (const auto group : chatroom->getGroups()) {
+    for (const auto& group : chatroom->getGroups()) {
         const auto groupAction = inviteMenu->addAction(tr("Invite to group '%1'").arg(group.name));
         connect(groupAction, &QAction::triggered, [=]() { chatroom->inviteFriend(group.group); });
     }
@@ -145,7 +145,7 @@ void FriendWidget::onContextMenuCalled(QContextMenuEvent* event)
 
     circleMenu->addSeparator();
 
-    for (const auto circle : chatroom->getOtherCircles()) {
+    for (const auto& circle : chatroom->getOtherCircles()) {
         QAction* action = new QAction(tr("Move to circle \"%1\"").arg(circle.name), circleMenu);
         connect(action, &QAction::triggered, [=]() { moveToCircle(circle.circleId); });
         circleMenu->addAction(action);
diff --git a/src/widget/style.cpp b/src/widget/style.cpp
index 3d09b2195..f902002f0 100644
--- a/src/widget/style.cpp
+++ b/src/widget/style.cpp
@@ -89,7 +89,7 @@ static QMap<QString, QString> dictColor;
 static QMap<QString, QString> dictFont;
 static QMap<QString, QString> dictTheme;
 
-QList<Style::ThemeNameColor> Style::themeNameColors = {
+static const QList<Style::ThemeNameColor> themeNameColors = {
     {Style::Light, QObject::tr("Default"), QColor()},
     {Style::Light, QObject::tr("Blue"), QColor("#004aa4")},
     {Style::Light, QObject::tr("Olive"), QColor("#97ba00")},
@@ -136,28 +136,30 @@ QString Style::getThemeFolder()
 }
 
 
-QMap<Style::ColorPalette, QString> Style::aliasColors = {{TransferGood, "transferGood"},
-                                                         {TransferWait, "transferWait"},
-                                                         {TransferBad, "transferBad"},
-                                                         {TransferMiddle, "transferMiddle"},
-                                                         {MainText,"mainText"},
-                                                         {NameActive, "nameActive"},
-                                                         {StatusActive,"statusActive"},
-                                                         {GroundExtra, "groundExtra"},
-                                                         {GroundBase, "groundBase"},
-                                                         {Orange, "orange"},
-                                                         {ThemeDark, "themeDark"},
-                                                         {ThemeMediumDark, "themeMediumDark"},
-                                                         {ThemeMedium, "themeMedium"},
-                                                         {ThemeLight, "themeLight"},
-                                                         {Action, "action"},
-                                                         {Link, "link"},
-                                                         {SearchHighlighted, "searchHighlighted"},
-                                                         {SelectText, "selectText"}};
+static const QMap<Style::ColorPalette, QString> aliasColors = {
+    {Style::TransferGood, "transferGood"},
+    {Style::TransferWait, "transferWait"},
+    {Style::TransferBad, "transferBad"},
+    {Style::TransferMiddle, "transferMiddle"},
+    {Style::MainText,"mainText"},
+    {Style::NameActive, "nameActive"},
+    {Style::StatusActive,"statusActive"},
+    {Style::GroundExtra, "groundExtra"},
+    {Style::GroundBase, "groundBase"},
+    {Style::Orange, "orange"},
+    {Style::ThemeDark, "themeDark"},
+    {Style::ThemeMediumDark, "themeMediumDark"},
+    {Style::ThemeMedium, "themeMedium"},
+    {Style::ThemeLight, "themeLight"},
+    {Style::Action, "action"},
+    {Style::Link, "link"},
+    {Style::SearchHighlighted, "searchHighlighted"},
+    {Style::SelectText, "selectText"},
+};
 
 // stylesheet filename, font -> stylesheet
 // QString implicit sharing deduplicates stylesheets rather than constructing a new one each time
-std::map<std::pair<const QString, const QFont>, const QString> Style::stylesheetsCache;
+static std::map<std::pair<const QString, const QFont>, const QString> stylesheetsCache;
 
 const QString Style::getStylesheet(const QString& filename, const QFont& baseFont)
 {
diff --git a/src/widget/style.h b/src/widget/style.h
index 4e92f9ccf..6e06f6727 100644
--- a/src/widget/style.h
+++ b/src/widget/style.h
@@ -96,11 +96,6 @@ signals:
 
 private:
     Style();
-
-private:
-    static QList<ThemeNameColor> themeNameColors;
-    static std::map<std::pair<const QString, const QFont>, const QString> stylesheetsCache;
-    static QMap<ColorPalette, QString> aliasColors;
 };
 
 #endif // STYLE_H
diff --git a/src/widget/widget.cpp b/src/widget/widget.cpp
index fbda698bb..f8bf0842e 100644
--- a/src/widget/widget.cpp
+++ b/src/widget/widget.cpp
@@ -361,7 +361,7 @@ void Widget::init()
 
     fileMenu->menu()->addSeparator();
     logoutAction = fileMenu->menu()->addAction(QString());
-    connect(logoutAction, &QAction::triggered, [this]() { Nexus::getInstance().showLogin(); });
+    connect(logoutAction, &QAction::triggered, []() { Nexus::getInstance().showLogin(); });
 
     editMenu = globalMenu->insertMenu(viewMenu, new QMenu(this));
     editMenu->menu()->addSeparator();
@@ -1395,7 +1395,6 @@ void Widget::onReceiptReceived(int friendId, ReceiptNum receipt)
 
 void Widget::addFriendDialog(const Friend* frnd, ContentDialog* dialog)
 {
-    uint32_t friendId = frnd->getId();
     const ToxPk& friendPk = frnd->getPublicKey();
     ContentDialog* contentDialog = ContentDialogManager::getInstance()->getFriendDialog(friendPk);
     bool isSeparate = settings.getSeparateWindow();
@@ -1959,8 +1958,7 @@ void Widget::onGroupMessageReceived(int groupnumber, int peernumber, const QStri
                                     bool isAction)
 {
     const GroupId& groupId = GroupList::id2Key(groupnumber);
-    Group* g = GroupList::findGroup(groupId);
-    assert(g);
+    assert(GroupList::findGroup(groupId));
 
     ToxPk author = core->getGroupPeerPk(groupnumber, peernumber);
 
@@ -2011,8 +2009,7 @@ void Widget::titleChangedByUser(const QString& title)
 void Widget::onGroupPeerAudioPlaying(int groupnumber, ToxPk peerPk)
 {
     const GroupId& groupId = GroupList::id2Key(groupnumber);
-    Group* g = GroupList::findGroup(groupId);
-    assert(g);
+    assert(GroupList::findGroup(groupId));
 
     auto form = groupChatForms[groupId].data();
     form->peerAudioPlaying(peerPk);
@@ -2313,8 +2310,7 @@ void Widget::setStatusBusy()
 void Widget::onGroupSendFailed(uint32_t groupnumber)
 {
     const auto& groupId = GroupList::id2Key(groupnumber);
-    Group* g = GroupList::findGroup(groupId);
-    assert(g);
+    assert(GroupList::findGroup(groupId));
 
     const auto message = tr("Message failed to send");
     const auto curTime = QDateTime::currentDateTime();
diff --git a/test/core/core_test.cpp b/test/core/core_test.cpp
index f897c934e..f27c3c5f4 100644
--- a/test/core/core_test.cpp
+++ b/test/core/core_test.cpp
@@ -106,7 +106,7 @@ void TestCore::startup_without_proxy()
 
     test_core = Core::makeToxCore(savedata, settings, err);
 
-    if(test_core == nullptr) {
+    if (test_core == nullptr) {
         QFAIL("ToxCore initialisation failed");
     }
 
@@ -132,7 +132,7 @@ void TestCore::startup_with_invalid_proxy()
 
     test_core = Core::makeToxCore(savedata, settings, err);
 
-    if(test_core != nullptr) {
+    if (test_core != nullptr) {
         QFAIL("ToxCore initialisation passed with invalid SOCKS5 proxy address");
     }
 
@@ -144,7 +144,7 @@ void TestCore::startup_with_invalid_proxy()
 
     test_core = Core::makeToxCore(savedata, settings, err);
 
-    if(test_core != nullptr) {
+    if (test_core != nullptr) {
         QFAIL("ToxCore initialisation passed with invalid HTTP proxy address");
     }
 }
diff --git a/test/model/messageprocessor_test.cpp b/test/model/messageprocessor_test.cpp
index 439dda4b6..b6438185d 100644
--- a/test/model/messageprocessor_test.cpp
+++ b/test/model/messageprocessor_test.cpp
@@ -39,7 +39,7 @@ class TestMessageProcessor : public QObject
     Q_OBJECT
 
 public:
-    TestMessageProcessor(){};
+    TestMessageProcessor(){}
 
 private slots:
     void testSelfMention();
diff --git a/test/model/sessionchatlog_test.cpp b/test/model/sessionchatlog_test.cpp
index b5e7976dd..a1af35530 100644
--- a/test/model/sessionchatlog_test.cpp
+++ b/test/model/sessionchatlog_test.cpp
@@ -61,7 +61,7 @@ class TestSessionChatLog : public QObject
     Q_OBJECT
 
 public:
-    TestSessionChatLog(){};
+    TestSessionChatLog(){}
 
 private slots:
     void init();
diff --git a/test/persistence/offlinemsgengine_test.cpp b/test/persistence/offlinemsgengine_test.cpp
index 5a421d07c..cf4e634d3 100644
--- a/test/persistence/offlinemsgengine_test.cpp
+++ b/test/persistence/offlinemsgengine_test.cpp
@@ -29,7 +29,7 @@ struct MockFriendMessageSender : public QObject, public ICoreFriendMessageSender
     Q_OBJECT
 public:
     MockFriendMessageSender(Friend* f)
-        : f(f){};
+        : f(f){}
     bool sendAction(uint32_t friendId, const QString& action, ReceiptNum& receipt) override
     {
         return false;