diff --git a/contrib/boost/GeometricTools_BSplineCurve.h b/contrib/boost/GeometricTools_BSplineCurve.h
index 3787fd107..bc52ce8e3 100644
--- a/contrib/boost/GeometricTools_BSplineCurve.h
+++ b/contrib/boost/GeometricTools_BSplineCurve.h
@@ -1018,8 +1018,7 @@ namespace gte
 
             for (int i = 1; i <= input.numUniqueKnots - 2; ++i)
             {
-                int mult = mUniqueKnots[i].multiplicity;
-                LogAssert(mult >= 1 && mult <= mDegree + 1, "Invalid interior multiplicity.");
+                LogAssert(mUniqueKnots[i].multiplicity >= 1 && mUniqueKnots[i].multiplicity <= mDegree + 1, "Invalid interior multiplicity.");
             }
 
             mOpen = (mult0 == mult1 && mult0 == mDegree + 1);
diff --git a/contrib/kmeans/kmeans.cpp b/contrib/kmeans/kmeans.cpp
index 368d0428c..d4445f78f 100644
--- a/contrib/kmeans/kmeans.cpp
+++ b/contrib/kmeans/kmeans.cpp
@@ -30,7 +30,7 @@ void Kmeans::free() {
 
 
 
-void Kmeans::initialize(Dataset const *aX, unsigned short aK, unsigned short *initialAssignment, int aNumThreads) {
+void Kmeans::initialize(Dataset const *aX, unsigned short aK, unsigned short *initialAssignment, [[maybe_unused]] int aNumThreads) {
     free();
 
     converged = false;
@@ -82,7 +82,7 @@ struct ThreadInfo {
 };
 #endif
 
-void *Kmeans::runner(void *args) {
+void *Kmeans::runner([[maybe_unused]] void *args) {
     #ifdef USE_THREADS
     ThreadInfo *ti = (ThreadInfo *)args;
     ti->numIterations = ti->km->runThread(ti->threadId, ti->maxIterations);
@@ -125,7 +125,7 @@ double Kmeans::getSSE() const {
     return sse;
 }
 
-void Kmeans::verifyAssignment(int iteration, int startNdx, int endNdx) const {
+void Kmeans::verifyAssignment([[maybe_unused]] int iteration, [[maybe_unused]] int startNdx, [[maybe_unused]] int endNdx) const {
     #ifdef VERIFY_ASSIGNMENTS
     for (int i = startNdx; i < endNdx; ++i) {
         // keep track of the squared distance and identity of the closest-seen
diff --git a/contrib/voronoi/Voronoi.cpp b/contrib/voronoi/Voronoi.cpp
index 08f707298..a42059353 100644
--- a/contrib/voronoi/Voronoi.cpp
+++ b/contrib/voronoi/Voronoi.cpp
@@ -778,12 +778,12 @@ Voronoi::line(float ax, float ay, float bx, float by)
     }
 
 void
-Voronoi::circle(float ax, float ay, float radius)
+Voronoi::circle([[maybe_unused]] float ax, [[maybe_unused]] float ay, [[maybe_unused]] float radius)
     {
     }
 
 void
-Voronoi::range(float pxmin, float pxmax, float pymin, float pymax)
+Voronoi::range([[maybe_unused]] float pxmin, [[maybe_unused]] float pxmax, [[maybe_unused]] float pymin, [[maybe_unused]] float pymax)
     {
     }
 
diff --git a/src/ANT/ANT.cpp b/src/ANT/ANT.cpp
index 944197a3c..93b352639 100644
--- a/src/ANT/ANT.cpp
+++ b/src/ANT/ANT.cpp
@@ -1302,7 +1302,7 @@ int ANT::rawWrite(uint8_t *bytes, int size) // unix!!
 
 }
 
-int ANT::rawRead(uint8_t bytes[], int size)
+int ANT::rawRead([[maybe_unused]] uint8_t bytes[], [[maybe_unused]] int size)
 {
 #ifdef WIN32
 #ifdef GC_HAVE_LIBUSB
diff --git a/src/ANT/ANTMessage.cpp b/src/ANT/ANTMessage.cpp
index 52025f2ec..2ef0bfc98 100644
--- a/src/ANT/ANTMessage.cpp
+++ b/src/ANT/ANTMessage.cpp
@@ -375,7 +375,7 @@ ANTMessage::ANTMessage(ANT *parent, const unsigned char *message) {
             {
 
                 // page no is first 7 bits, page change toggle is bit 8
-                bool page_toggle = data_page&128;
+                // bool page_toggle = data_page&128;
                 data_page &= 127;
 
                 // Heartrate is fairly simple. Although
diff --git a/src/Charts/GenericSelectTool.cpp b/src/Charts/GenericSelectTool.cpp
index 382a61aa8..261955f86 100644
--- a/src/Charts/GenericSelectTool.cpp
+++ b/src/Charts/GenericSelectTool.cpp
@@ -479,7 +479,7 @@ GenericSelectTool::clicked(QPointF pos)
 }
 
 bool
-GenericSelectTool::released(QPointF /* pos */)
+GenericSelectTool::released([[maybe_unused]] QPointF pos)
 {
     if (mode == RECTANGLE || mode == XRANGE) {
 
diff --git a/src/Cloud/CloudService.cpp b/src/Cloud/CloudService.cpp
index 2987b0cec..47b4456d6 100644
--- a/src/Cloud/CloudService.cpp
+++ b/src/Cloud/CloudService.cpp
@@ -289,7 +289,7 @@ CloudService::uncompressRide(QByteArray *data, QString name, QStringList &errors
 }
 
 void
-CloudService::sslErrors(QWidget* parent, QNetworkReply* reply ,QList<QSslError> errors)
+CloudService::sslErrors(QWidget* parent, [[maybe_unused]] QNetworkReply* reply ,QList<QSslError> errors)
 {
     QString errorString = "";
     foreach (const QSslError e, errors ) {
diff --git a/src/Gui/CalendarItemDelegates.cpp b/src/Gui/CalendarItemDelegates.cpp
index e41a6108c..aa54b819b 100644
--- a/src/Gui/CalendarItemDelegates.cpp
+++ b/src/Gui/CalendarItemDelegates.cpp
@@ -432,7 +432,7 @@ CalendarDetailedDayDelegate::paint
         int iconWidth = 0;
         if (height >= lineHeight && columnWidth >= lineHeight) {
             QColor pixmapColor(entry.color);
-            int headlineOffset = 0;
+            // int headlineOffset = 0;
             if (height >= 2 * lineHeight + priSecSpacing && columnWidth >= 2 * lineHeight + priSecSpacing) {
                 iconWidth = 2 * lineHeight + priSecSpacing;
             } else {
@@ -595,9 +595,9 @@ CalendarHeadlineDelegate::paint
     const int leftMargin = 4 * dpiXFactor;
     const int rightMargin = 4 * dpiXFactor;
     const int topMargin = 2 * dpiYFactor;
-    const int bottomMargin = 4 * dpiYFactor;
+    // const int bottomMargin = 4 * dpiYFactor;
     const int lineSpacing = 2 * dpiYFactor;
-    const int iconSpacing = 2 * dpiXFactor;
+    // const int iconSpacing = 2 * dpiXFactor;
     const int radius = 4 * dpiXFactor;
 
     // Headline: Date, Phases and Events
@@ -1289,7 +1289,7 @@ AgendaEntryDelegate::paint
     QFontMetrics line1FM(line1Font);
     const int lineSpacing = attributes.lineSpacing * dpiYFactor;
     const int lineHeight = line1FM.height();
-    const int radius = 4 * dpiXFactor;
+    // const int radius = 4 * dpiXFactor;
     const int iconInnerSpacing = 4 * dpiXFactor;
     const int iconTextSpacing = attributes.iconTextSpacing * dpiXFactor;
     const int iconWidth = 2 * lineHeight + lineSpacing;
@@ -1382,7 +1382,7 @@ AgendaEntryDelegate::sizeHint
             const int iconWidth = 2 * lineHeight + lineSpacing;
             int tertiaryWidth = width - iconWidth - attributes.iconTextSpacing * dpiXFactor - attributes.padding.left() - attributes.padding.right();
             int numLines;
-            int tertiary;
+            // int tertiary;
             layoutTertiaryText(entry.tertiary, option.font, tertiaryWidth, numLines, tertiaryHeight, nullptr, true);
             tertiaryHeight += 2 * lineSpacing;
         }
diff --git a/src/Gui/StyledItemDelegates.cpp b/src/Gui/StyledItemDelegates.cpp
index 3fdc4f04e..4dc9dac30 100644
--- a/src/Gui/StyledItemDelegates.cpp
+++ b/src/Gui/StyledItemDelegates.cpp
@@ -813,7 +813,7 @@ ListEditDelegate::setDisplayLength
 
 QWidget*
 ListEditDelegate::createEditor
-(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const
+([[maybe_unused]] QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const
 {
     Q_UNUSED(option)
     Q_UNUSED(index)
diff --git a/src/Metrics/PMCData.cpp b/src/Metrics/PMCData.cpp
index e700ff5e0..53ccdfb8e 100644
--- a/src/Metrics/PMCData.cpp
+++ b/src/Metrics/PMCData.cpp
@@ -220,8 +220,8 @@ void PMCData::refresh()
     //
     // STEP TWO What are the seedings and ride values
     //
-    const double lte = (double)exp(-1.0/ltsDays_);
-    const double ste = (double)exp(-1.0/stsDays_);
+    // const double lte = (double)exp(-1.0/ltsDays_);
+    // const double ste = (double)exp(-1.0/stsDays_);
 
     // clear what's there
     stress_.fill(0);