diff --git a/libs/image/tests/kis_filter_weights_applicator_test.cpp b/libs/image/tests/kis_filter_weights_applicator_test.cpp
--- a/libs/image/tests/kis_filter_weights_applicator_test.cpp
+++ b/libs/image/tests/kis_filter_weights_applicator_test.cpp
@@ -564,7 +564,7 @@
     return dev;
 }
 
-void prepareUniformPixels(quint8 r[], quint8 a[], int pixelsNumber, bool horizontal)
+void prepareUniformPixels(quint8 r[], quint8 a[], int pixelsNumber, bool /*horizontal*/)
 {
     for (int i = 0; i < pixelsNumber; i++) {
 
diff --git a/libs/store/KoQuaZipStore.cpp b/libs/store/KoQuaZipStore.cpp
--- a/libs/store/KoQuaZipStore.cpp
+++ b/libs/store/KoQuaZipStore.cpp
@@ -258,7 +258,7 @@
     return true;
 }
 
-bool KoQuaZipStore::enterRelativeDirectory(const QString &path)
+bool KoQuaZipStore::enterRelativeDirectory(const QString & /*path*/)
 {
     return true;
 }
diff --git a/plugins/dockers/advancedcolorselector/kis_color_selector_component.h b/plugins/dockers/advancedcolorselector/kis_color_selector_component.h
--- a/plugins/dockers/advancedcolorselector/kis_color_selector_component.h
+++ b/plugins/dockers/advancedcolorselector/kis_color_selector_component.h
@@ -96,7 +96,7 @@
     /// a subclass can implement this method to note that the point, although it is in
     /// containsPointInComponentCoords area, still cannot be selected as a color (e.g.
     /// it is masked out). Default implementation always returns true.
-    virtual bool allowsColorSelectionAtPoint(const QPoint &pt) const;
+    virtual bool allowsColorSelectionAtPoint(const QPoint &) const;
 
     // Workaround for Bug 287001
     void setLastMousePosition(int x, int y);
diff --git a/plugins/dockers/advancedcolorselector/kis_color_selector_component.cpp b/plugins/dockers/advancedcolorselector/kis_color_selector_component.cpp
--- a/plugins/dockers/advancedcolorselector/kis_color_selector_component.cpp
+++ b/plugins/dockers/advancedcolorselector/kis_color_selector_component.cpp
@@ -136,7 +136,7 @@
         return false;
 }
 
-bool KisColorSelectorComponent::allowsColorSelectionAtPoint(const QPoint &pt) const
+bool KisColorSelectorComponent::allowsColorSelectionAtPoint(const QPoint & /*pt*/) const
 {
     return true;
 }
diff --git a/plugins/dockers/smallcolorselector/KisGLImageWidget.cpp b/plugins/dockers/smallcolorselector/KisGLImageWidget.cpp
--- a/plugins/dockers/smallcolorselector/KisGLImageWidget.cpp
+++ b/plugins/dockers/smallcolorselector/KisGLImageWidget.cpp
@@ -59,6 +59,8 @@
     : QOpenGLWidget(parent),
       m_texture(QOpenGLTexture::Target2D)
 {
+    Q_UNUSED(colorSpace)
+
 #if QT_VERSION >= QT_VERSION_CHECK(5, 10, 0)
     setTextureFormat(GL_RGBA16F);
 #endif
@@ -183,9 +185,9 @@
 
 void KisGLImageWidget::paintGL()
 {
-    const QColor bgColor = palette().background().color();
     // TODO: fix conversion to the destination surface space
-    //glClearColor(bgColor.redF(), bgColor.greenF(), bgColor.blueF(), 1.0f);
+    // Fill with bright color as as default for debugging purposes
+    // glClearColor(bgColor.redF(), bgColor.greenF(), bgColor.blueF(), 1.0f);
     glClearColor(0.3, 0.2, 0.8, 1.0f);
     glClear(GL_COLOR_BUFFER_BIT);
 
diff --git a/plugins/dockers/smallcolorselector/kis_small_color_widget.cc b/plugins/dockers/smallcolorselector/kis_small_color_widget.cc
--- a/plugins/dockers/smallcolorselector/kis_small_color_widget.cc
+++ b/plugins/dockers/smallcolorselector/kis_small_color_widget.cc
@@ -264,8 +264,8 @@
 
 namespace {
 struct FillHPolicy {
-    static inline void getRGB(qreal hue, float xPortionCoeff, float yPortionCoeff,
-                              int x, int y, float *r, float *g, float *b) {
+    static inline void getRGB(qreal /*hue*/, float xPortionCoeff, float /*yPortionCoeff*/,
+                              int x, int /*y*/, float *r, float *g, float *b) {
 
         HSVToRGB(xPortionCoeff * x * 360.0f, 1.0, 1.0, r, g, b);
     }
diff --git a/plugins/paintops/gridbrush/kis_grid_paintop.cpp b/plugins/paintops/gridbrush/kis_grid_paintop.cpp
--- a/plugins/paintops/gridbrush/kis_grid_paintop.cpp
+++ b/plugins/paintops/gridbrush/kis_grid_paintop.cpp
@@ -48,7 +48,7 @@
 #endif
 
 
-KisGridPaintOp::KisGridPaintOp(const KisPaintOpSettingsSP settings, KisPainter *painter, KisNodeSP node, KisImageSP image)
+KisGridPaintOp::KisGridPaintOp(const KisPaintOpSettingsSP settings, KisPainter *painter, KisNodeSP node, KisImageSP /*image*/)
     : KisPaintOp(painter)
     , m_settings(static_cast<KisGridPaintOpSettings*>(const_cast<KisPaintOpSettings*>(settings.data())))
     , m_node(node)
diff --git a/plugins/paintops/hatching/kis_hatching_paintop.cpp b/plugins/paintops/hatching/kis_hatching_paintop.cpp
--- a/plugins/paintops/hatching/kis_hatching_paintop.cpp
+++ b/plugins/paintops/hatching/kis_hatching_paintop.cpp
@@ -45,7 +45,7 @@
 
 #include <KoColorSpaceRegistry.h>
 
-KisHatchingPaintOp::KisHatchingPaintOp(const KisPaintOpSettingsSP settings, KisPainter * painter, KisNodeSP node, KisImageSP image)
+KisHatchingPaintOp::KisHatchingPaintOp(const KisPaintOpSettingsSP settings, KisPainter * painter, KisNodeSP node, KisImageSP /*image*/)
     : KisBrushBasedPaintOp(settings, painter)
 {
     Q_UNUSED(node);
diff --git a/plugins/paintops/libpaintop/kis_clipboard_brush_widget.cpp b/plugins/paintops/libpaintop/kis_clipboard_brush_widget.cpp
--- a/plugins/paintops/libpaintop/kis_clipboard_brush_widget.cpp
+++ b/plugins/paintops/libpaintop/kis_clipboard_brush_widget.cpp
@@ -36,7 +36,7 @@
 #include "kis_gbr_brush.h"
 #include "kis_brush_server.h"
 
-KisClipboardBrushWidget::KisClipboardBrushWidget(QWidget *parent, const QString &caption, KisImageWSP image)
+KisClipboardBrushWidget::KisClipboardBrushWidget(QWidget *parent, const QString &caption, KisImageWSP /*image*/)
     : KisWdgClipboardBrush(parent)
 {
     setWindowTitle(caption);
diff --git a/plugins/paintops/roundmarker/kis_roundmarkerop.cpp b/plugins/paintops/roundmarker/kis_roundmarkerop.cpp
--- a/plugins/paintops/roundmarker/kis_roundmarkerop.cpp
+++ b/plugins/paintops/roundmarker/kis_roundmarkerop.cpp
@@ -43,7 +43,7 @@
 
 
 
-KisRoundMarkerOp::KisRoundMarkerOp(KisPaintOpSettingsSP settings, KisPainter* painter, KisNodeSP node, KisImageSP image)
+KisRoundMarkerOp::KisRoundMarkerOp(KisPaintOpSettingsSP settings, KisPainter* painter, KisNodeSP node, KisImageSP /*image*/)
     : KisPaintOp(painter)
     , m_firstRun(true)
     , m_lastRadius(1.0)