From ece49f2d2b5477e8db901c391b9dcfb47d3b3a6f Mon Sep 17 00:00:00 2001
From: jkriege2 <jan@jkrieger.de>
Date: Tue, 19 Jul 2022 10:24:52 +0200
Subject: [PATCH] FIXED issue #80: "Bug with multiple inheritance with Q_GDAGET
 with CLANG", thanks to user:igormironchik, caused by QTBUG-104874

---
 doc/dox/whatsnew.dox                          |  1 +
 lib/jkqtcommon/jkqtpenhancedpainter.h         |  1 -
 .../graphs/jkqtpboxplotstylingmixins.h        |  5 ++-
 .../graphs/jkqtpviolinplotstylingmixins.h     |  5 ++-
 lib/jkqtplotter/jkqtpbaseplotterstyle.h       |  1 +
 lib/jkqtplotter/jkqtpcoordinateaxesstyle.h    |  1 +
 lib/jkqtplotter/jkqtpgraphsbaseerrors.h       | 25 +++++++++---
 lib/jkqtplotter/jkqtpgraphsbasestyle.h        | 31 +++++++++------
 .../jkqtpgraphsbasestylingmixins.h            | 39 ++++++++++++++++---
 lib/jkqtplotter/jkqtpimagetools.h             |  9 ++++-
 lib/jkqtplotter/jkqtpkeystyle.h               |  1 +
 lib/jkqtplotter/jkqtplotter_configmacros.h    | 10 ++++-
 lib/jkqtplotter/jkqtplotterstyle.h            |  1 +
 13 files changed, 101 insertions(+), 29 deletions(-)

diff --git a/doc/dox/whatsnew.dox b/doc/dox/whatsnew.dox
index 7110188697..bc2557763b 100644
--- a/doc/dox/whatsnew.dox
+++ b/doc/dox/whatsnew.dox
@@ -20,6 +20,7 @@ Changes, compared to  \ref page_whatsnew_V4_0_0 "v4.0.0" include:
   <li>JKQtPlotter:<ul>
     <li>FIXED issue described in <a href="https://github.com/jkriege2/JKQtPlotter/pull/62">#62: Fix custom labels draw, because giving exactly two label-strings did not display all of them</a>, thanks to <a href="https://github.com/FalsinSoft">user:FalsinSoft</a></li>
     <li>FIXED issue <a href="https://github.com/jkriege2/JKQtPlotter/pull/70">#70: Typo in jkqtplotter/CMakeLists.txt</a>, thanks to <a href="https://github.com/tedlinlab">user:tedlinlab</a></li>
+    <li>FIXED issue <a href="https://github.com/jkriege2/JKQtPlotter/pull/80">#80: Bug with multiple inheritance with Q_GDAGET with CLANG</a>, thanks to <a href="https://github.com/igormironchik">user:igormironchik</a>, caused by <a href="https://bugreports.qt.io/browse/QTBUG-104874">QTBUG-104874</a></li>
     <li>FIXED: styling was not properly applied to coordinate axes of colorbars outside the plot</li>
     <li>IMPROVED: QT6-compatibility by removing deprecated warnings</li>
     <li>NEW: JKQTPFilledCurveXGraph and JKQTPFilledCurveYGraph can now plot wiggle plots with different fill styles above and below the baseline (feature request <a href="https://github.com/jkriege2/JKQtPlotter/issues/68">#68 Wiggle Plots</a> from <a href="https://github.com/xichaoqiang">user:xichaoqiang</a>   </li>
diff --git a/lib/jkqtcommon/jkqtpenhancedpainter.h b/lib/jkqtcommon/jkqtpenhancedpainter.h
index 58d3fac1f7..4431227730 100644
--- a/lib/jkqtcommon/jkqtpenhancedpainter.h
+++ b/lib/jkqtcommon/jkqtpenhancedpainter.h
@@ -31,7 +31,6 @@
 
 */
 class JKQTCOMMON_LIB_EXPORT JKQTPEnhancedPainter : public QPainter {
-        Q_GADGET
     public:
         JKQTPEnhancedPainter(QPaintDevice* device);
         JKQTPEnhancedPainter();
diff --git a/lib/jkqtplotter/graphs/jkqtpboxplotstylingmixins.h b/lib/jkqtplotter/graphs/jkqtpboxplotstylingmixins.h
index 39302195da..d8492f18e6 100644
--- a/lib/jkqtplotter/graphs/jkqtpboxplotstylingmixins.h
+++ b/lib/jkqtplotter/graphs/jkqtpboxplotstylingmixins.h
@@ -25,6 +25,7 @@
 #include <QPainter>
 #include "jkqtplotter/jkqtptools.h"
 #include "jkqtplotter/jkqtplotter_imexport.h"
+#include "jkqtplotter/jkqtplotter_configmacros.h"
 #include "jkqtplotter/jkqtpgraphsbase.h"
 #include "jkqtplotter/jkqtpgraphsbasestylingmixins.h"
 
@@ -43,7 +44,9 @@
     \image html test_styledboxplot.png
  */
 class JKQTPLOTTER_LIB_EXPORT JKQTPGraphBoxplotStyleMixin: public JKQTPGraphLineStyleMixin, public JKQTPGraphFillStyleMixin {
-        Q_GADGET
+#ifndef JKQTPLOTTER_WORKAROUND_QGADET_BUG
+      Q_GADGET
+#endif
     public:
         /** \brief class constructor */
         JKQTPGraphBoxplotStyleMixin();
diff --git a/lib/jkqtplotter/graphs/jkqtpviolinplotstylingmixins.h b/lib/jkqtplotter/graphs/jkqtpviolinplotstylingmixins.h
index 22a59b59be..f6c332805e 100644
--- a/lib/jkqtplotter/graphs/jkqtpviolinplotstylingmixins.h
+++ b/lib/jkqtplotter/graphs/jkqtpviolinplotstylingmixins.h
@@ -26,6 +26,7 @@
 #include <QPainter>
 #include "jkqtplotter/jkqtptools.h"
 #include "jkqtplotter/jkqtplotter_imexport.h"
+#include "jkqtplotter/jkqtplotter_configmacros.h"
 #include "jkqtplotter/jkqtpgraphsbase.h"
 #include "jkqtplotter/jkqtpgraphsbasestylingmixins.h"
 
@@ -40,7 +41,9 @@
 
  */
 class JKQTPLOTTER_LIB_EXPORT JKQTPGraphViolinplotStyleMixin: public JKQTPGraphLineStyleMixin, public JKQTPGraphFillStyleMixin {
-        Q_GADGET
+#ifndef JKQTPLOTTER_WORKAROUND_QGADET_BUG
+      Q_GADGET
+#endif
     public:
 
 
diff --git a/lib/jkqtplotter/jkqtpbaseplotterstyle.h b/lib/jkqtplotter/jkqtpbaseplotterstyle.h
index 530ac584a4..85f4b2a173 100644
--- a/lib/jkqtplotter/jkqtpbaseplotterstyle.h
+++ b/lib/jkqtplotter/jkqtpbaseplotterstyle.h
@@ -27,6 +27,7 @@
 #include "jkqtplotter/jkqtpimagetools.h"
 #include "jkqtplotter/jkqtpgraphsbasestyle.h"
 #include "jkqtplotter/jkqtplotter_imexport.h"
+#include "jkqtplotter/jkqtplotter_configmacros.h"
 #include "jkqtcommon/jkqtpdrawingtools.h"
 #include "jkqtcommon/jkqtpbasicimagetools.h"
 #include <QColor>
diff --git a/lib/jkqtplotter/jkqtpcoordinateaxesstyle.h b/lib/jkqtplotter/jkqtpcoordinateaxesstyle.h
index c8a12710f7..15d4282372 100644
--- a/lib/jkqtplotter/jkqtpcoordinateaxesstyle.h
+++ b/lib/jkqtplotter/jkqtpcoordinateaxesstyle.h
@@ -25,6 +25,7 @@
 #include <QColor>
 #include "jkqtplotter/jkqtptools.h"
 #include "jkqtplotter/jkqtplotter_imexport.h"
+#include "jkqtplotter/jkqtplotter_configmacros.h"
 
 class JKQTBasePlotterStyle; // forward
 
diff --git a/lib/jkqtplotter/jkqtpgraphsbaseerrors.h b/lib/jkqtplotter/jkqtpgraphsbaseerrors.h
index 85298bb20c..770a6c9898 100644
--- a/lib/jkqtplotter/jkqtpgraphsbaseerrors.h
+++ b/lib/jkqtplotter/jkqtpgraphsbaseerrors.h
@@ -30,6 +30,7 @@
 #include "jkqtplotter/jkqtptools.h"
 #include "jkqtplotter/jkqtplotter_imexport.h"
 #include "jkqtplotter/jkqtpimagetools.h"
+#include "jkqtplotter/jkqtplotter_configmacros.h"
 
 
 /*! \brief This mix-in class assembles all styling properties applicable to error indicators
@@ -42,7 +43,9 @@
 
  */
 class JKQTPLOTTER_LIB_EXPORT JKQTPGraphErrorStyleMixin {
-        Q_GADGET
+#ifndef JKQTPLOTTER_WORKAROUND_QGADET_BUG
+      Q_GADGET
+#endif
     public:
         /** \brief class contructor */
         JKQTPGraphErrorStyleMixin();
@@ -192,7 +195,9 @@ class JKQTPLOTTER_LIB_EXPORT JKQTPGraphErrorStyleMixin {
     \see JKQTPYGraphErrorData, \ref jkqtplotter_graphsgroup_classstructure_mixins
  */
 class JKQTPLOTTER_LIB_EXPORT JKQTPXGraphErrorData  {
-        Q_GADGET
+#ifndef JKQTPLOTTER_WORKAROUND_QGADET_BUG
+      Q_GADGET
+#endif
     public:
         /** \brief class contructor */
         JKQTPXGraphErrorData();
@@ -242,7 +247,9 @@ class JKQTPLOTTER_LIB_EXPORT JKQTPXGraphErrorData  {
     \see JKQTPXGraphErrorData \ref jkqtplotter_graphsgroup_classstructure_mixins
  */
 class JKQTPLOTTER_LIB_EXPORT JKQTPYGraphErrorData  {
-        Q_GADGET
+#ifndef JKQTPLOTTER_WORKAROUND_QGADET_BUG
+      Q_GADGET
+#endif
     public:
         /** \brief class contructor */
         JKQTPYGraphErrorData();
@@ -290,7 +297,9 @@ class JKQTPLOTTER_LIB_EXPORT JKQTPYGraphErrorData  {
     \see JKQTPXGraphErrorData, JKQTPGraphErrorStyleMixin, \ref jkqtplotter_graphsgroup_classstructure_mixins
  */
 class JKQTPLOTTER_LIB_EXPORT JKQTPXGraphErrors: public JKQTPXGraphErrorData, public JKQTPGraphErrorStyleMixin {
-        Q_GADGET
+#ifndef JKQTPLOTTER_WORKAROUND_QGADET_BUG
+      Q_GADGET
+#endif
     public:
         /** \brief class contructor */
         JKQTPXGraphErrors();
@@ -312,7 +321,9 @@ class JKQTPLOTTER_LIB_EXPORT JKQTPXGraphErrors: public JKQTPXGraphErrorData, pub
     \see JKQTPYGraphErrorData, JKQTPGraphErrorStyleMixin, \ref jkqtplotter_graphsgroup_classstructure_mixins
  */
 class JKQTPLOTTER_LIB_EXPORT JKQTPYGraphErrors: public JKQTPYGraphErrorData, public JKQTPGraphErrorStyleMixin {
-        Q_GADGET
+#ifndef JKQTPLOTTER_WORKAROUND_QGADET_BUG
+      Q_GADGET
+#endif
     public:
         /** \brief class contructor */
         JKQTPYGraphErrors();
@@ -336,7 +347,9 @@ class JKQTPLOTTER_LIB_EXPORT JKQTPYGraphErrors: public JKQTPYGraphErrorData, pub
     \see JKQTPXGraphErrorData, JKQTPYGraphErrorData, JKQTPGraphErrorStyleMixin, \ref jkqtplotter_graphsgroup_classstructure_mixins
  */
 class JKQTPLOTTER_LIB_EXPORT JKQTPXYGraphErrors: public JKQTPXGraphErrorData, public JKQTPYGraphErrorData, public JKQTPGraphErrorStyleMixin {
-        Q_GADGET
+#ifndef JKQTPLOTTER_WORKAROUND_QGADET_BUG
+      Q_GADGET
+#endif
     public:
         /** \brief class contructor */
         JKQTPXYGraphErrors();
diff --git a/lib/jkqtplotter/jkqtpgraphsbasestyle.h b/lib/jkqtplotter/jkqtpgraphsbasestyle.h
index 3990cfabb7..4a1fc58679 100644
--- a/lib/jkqtplotter/jkqtpgraphsbasestyle.h
+++ b/lib/jkqtplotter/jkqtpgraphsbasestyle.h
@@ -28,6 +28,7 @@
 #include "jkqtplotter/jkqtplotter_imexport.h"
 #include "jkqtcommon/jkqtpdrawingtools.h"
 #include "jkqtcommon/jkqtpbasicimagetools.h"
+#include "jkqtplotter/jkqtplotter_configmacros.h"
 #include <QColor>
 #include <QPainter>
 #include <QString>
@@ -45,7 +46,9 @@ class JKQTBasePlotterStyle; // forward
  *  \see JKQTBasePlotter, \ref jkqtpplotter_styling
  */
 class JKQTPLOTTER_LIB_EXPORT JKQTGraphsSpecificStyleProperties {
-        Q_GADGET
+#ifndef JKQTPLOTTER_WORKAROUND_QGADET_BUG
+      Q_GADGET
+#endif
     public:
         /** \brief initializes the object for the given \a type and takes some properties from the \a parent */
         JKQTGraphsSpecificStyleProperties(JKQTPPlotStyleType type, const JKQTBasePlotterStyle& parent);
@@ -104,7 +107,7 @@ class JKQTPLOTTER_LIB_EXPORT JKQTGraphsSpecificStyleProperties {
     protected:
         /** \brief modifies some of the settings to match the defaults for the given JKQTPPlotStyleType (e.g. sets line-width for impulses ...) */
         void modifyForDefaultStyle(JKQTPPlotStyleType type);
- };
+};
 
 
 
@@ -113,9 +116,11 @@ class JKQTPLOTTER_LIB_EXPORT JKQTGraphsSpecificStyleProperties {
  *
  *  \see JKQTBasePlotter, \ref jkqtpplotter_styling
  */
- class JKQTPLOTTER_LIB_EXPORT JKQTGeometricSpecificStyleProperties: public JKQTGraphsSpecificStyleProperties {
-     Q_GADGET
- public:
+class JKQTPLOTTER_LIB_EXPORT JKQTGeometricSpecificStyleProperties: public JKQTGraphsSpecificStyleProperties {
+#ifndef JKQTPLOTTER_WORKAROUND_QGADET_BUG
+      Q_GADGET
+#endif
+public:
      JKQTGeometricSpecificStyleProperties(const JKQTBasePlotterStyle& parent);
      JKQTGeometricSpecificStyleProperties(const JKQTBasePlotterStyle& parent, const JKQTGraphsSpecificStyleProperties& other);
      JKQTGeometricSpecificStyleProperties(JKQTPPlotStyleType type, const JKQTBasePlotterStyle& parent);
@@ -153,7 +158,7 @@ class JKQTPLOTTER_LIB_EXPORT JKQTGraphsSpecificStyleProperties {
      Qt::BrushStyle defaultFillStyle;
 
 
- };
+};
 
 
  /** \brief Support Class for JKQTBasePlotter, which summarizes all properties that define the visual styling of annotation elements
@@ -161,9 +166,11 @@ class JKQTPLOTTER_LIB_EXPORT JKQTGraphsSpecificStyleProperties {
  *
  *  \see JKQTBasePlotter, \ref jkqtpplotter_styling
  */
- class JKQTPLOTTER_LIB_EXPORT JKQTAnnotationsSpecificStyleProperties: public JKQTGeometricSpecificStyleProperties {
-     Q_GADGET
- public:
+class JKQTPLOTTER_LIB_EXPORT JKQTAnnotationsSpecificStyleProperties: public JKQTGeometricSpecificStyleProperties {
+#ifndef JKQTPLOTTER_WORKAROUND_QGADET_BUG
+      Q_GADGET
+#endif
+public:
      JKQTAnnotationsSpecificStyleProperties(const JKQTBasePlotterStyle& parent);
      JKQTAnnotationsSpecificStyleProperties(const JKQTBasePlotterStyle& parent, const JKQTGraphsSpecificStyleProperties& other);
      JKQTAnnotationsSpecificStyleProperties(const JKQTAnnotationsSpecificStyleProperties& other)=default;
@@ -198,7 +205,7 @@ class JKQTPLOTTER_LIB_EXPORT JKQTGraphsSpecificStyleProperties {
      QString defaultFontName;
 
 
- };
+};
 
 
 
@@ -208,7 +215,9 @@ class JKQTPLOTTER_LIB_EXPORT JKQTGraphsSpecificStyleProperties {
  *  \see JKQTBasePlotter, \ref jkqtpplotter_styling
  */
 class JKQTPLOTTER_LIB_EXPORT JKQTGraphsBaseStyle {
-        Q_GADGET
+#ifndef JKQTPLOTTER_WORKAROUND_QGADET_BUG
+      Q_GADGET
+#endif
     public:
         JKQTGraphsBaseStyle(const JKQTBasePlotterStyle& parent);
 
diff --git a/lib/jkqtplotter/jkqtpgraphsbasestylingmixins.h b/lib/jkqtplotter/jkqtpgraphsbasestylingmixins.h
index f0257ee4b3..efee34cf2f 100644
--- a/lib/jkqtplotter/jkqtpgraphsbasestylingmixins.h
+++ b/lib/jkqtplotter/jkqtpgraphsbasestylingmixins.h
@@ -30,6 +30,7 @@
 #include "jkqtplotter/jkqtplotter_imexport.h"
 #include "jkqtplotter/jkqtpbaseplotter.h"
 #include "jkqtcommon/jkqtpdrawingtools.h"
+#include "jkqtplotter/jkqtplotter_configmacros.h"
 
 
 class JKQTPlotter; // forward
@@ -118,10 +119,12 @@ class JKQTPLOTTER_LIB_EXPORT JKQTPGraphLineStyleMixin {
         QColor getHighlightingLineColor() const;
 
 
+#ifndef JKQTPLOTTER_WORKAROUND_QGADET_BUG
         Q_PROPERTY(QColor highlightingLineColor MEMBER m_highlightingLineColor READ getHighlightingLineColor WRITE setHighlightingLineColor)
         Q_PROPERTY(QColor lineColor MEMBER m_lineColor READ getLineColor WRITE setLineColor)
         Q_PROPERTY(Qt::PenStyle lineStyle MEMBER m_lineStyle READ getLineStyle WRITE setLineStyle)
         Q_PROPERTY(double lineWidth MEMBER m_lineWidth READ getLineWidth WRITE setLineWidth)
+#endif
     private:
         /** \brief graph line pen */
         QPen m_linePen;
@@ -156,7 +159,9 @@ class JKQTPLOTTER_LIB_EXPORT JKQTPGraphLineStyleMixin {
     \see JKQTPGraphDecoratedLineStyleMixin for a Mix-In for both ends
 */
 class JKQTPLOTTER_LIB_EXPORT JKQTPGraphDecoratedHeadLineStyleMixin: public JKQTPGraphLineStyleMixin {
-    Q_GADGET
+#ifndef JKQTPLOTTER_WORKAROUND_QGADET_BUG
+      Q_GADGET
+#endif
 public:
     /** \brief class constructor */
     JKQTPGraphDecoratedHeadLineStyleMixin();
@@ -183,8 +188,10 @@ public:
 
 
 
+#ifndef JKQTPLOTTER_WORKAROUND_QGADET_BUG
     Q_PROPERTY(JKQTPLineDecoratorStyle headDecoratorStyle MEMBER m_headDecoratorStyle READ getHeadDecoratorStyle WRITE setHeadDecoratorStyle)
     Q_PROPERTY(double headDecoratorSizeFactor MEMBER m_headDecoratorSizeFactor READ getHeadDecoratorSizeFactor WRITE setHeadDecoratorSizeFactor)
+#endif
 private:
     /** \brief head decorator style */
     JKQTPLineDecoratorStyle m_headDecoratorStyle;
@@ -207,7 +214,9 @@ private:
     \see JKQTPGraphDecoratedHeadLineStyleMixin for a Mix-In for one end (head) only
 */
 class JKQTPLOTTER_LIB_EXPORT JKQTPGraphDecoratedLineStyleMixin: public JKQTPGraphLineStyleMixin {
-    Q_GADGET
+#ifndef JKQTPLOTTER_WORKAROUND_QGADET_BUG
+      Q_GADGET
+#endif
 public:
     /** \brief class constructor */
     JKQTPGraphDecoratedLineStyleMixin();
@@ -247,10 +256,12 @@ public:
 
 
 
+#ifndef JKQTPLOTTER_WORKAROUND_QGADET_BUG
     Q_PROPERTY(JKQTPLineDecoratorStyle headDecoratorStyle MEMBER m_headDecoratorStyle READ getHeadDecoratorStyle WRITE setHeadDecoratorStyle)
     Q_PROPERTY(JKQTPLineDecoratorStyle tailDecoratorStyle MEMBER m_tailDecoratorStyle READ getTailDecoratorStyle WRITE setTailDecoratorStyle)
     Q_PROPERTY(double headDecoratorSizeFactor MEMBER m_headDecoratorSizeFactor READ getHeadDecoratorSizeFactor WRITE setHeadDecoratorSizeFactor)
     Q_PROPERTY(double tailDecoratorSizeFactor MEMBER m_tailDecoratorSizeFactor READ getTailDecoratorSizeFactor WRITE setTailDecoratorSizeFactor)
+#endif
 private:
     /** \brief head decorator style */
     JKQTPLineDecoratorStyle m_headDecoratorStyle;
@@ -278,7 +289,9 @@ private:
     .
  */
 class JKQTPLOTTER_LIB_EXPORT JKQTPGraphSymbolStyleMixin {
-        Q_GADGET
+#ifndef JKQTPLOTTER_WORKAROUND_QGADET_BUG
+      Q_GADGET
+#endif
     public:
         /** \brief class constructor */
         JKQTPGraphSymbolStyleMixin();
@@ -314,11 +327,13 @@ class JKQTPLOTTER_LIB_EXPORT JKQTPGraphSymbolStyleMixin {
 
 
 
+#ifndef JKQTPLOTTER_WORKAROUND_QGADET_BUG
         Q_PROPERTY(JKQTPGraphSymbols symbolType MEMBER m_symbolType READ getSymbolType WRITE setSymbolType)
         Q_PROPERTY(QColor symbolColor MEMBER m_symbolColor READ getSymbolColor WRITE setSymbolColor)
         Q_PROPERTY(QColor symbolFillColor MEMBER m_symbolFillColor READ getSymbolFillColor WRITE setSymbolFillColor)
         Q_PROPERTY(double symbolSize MEMBER m_symbolSize READ getSymbolSize WRITE setSymbolSize)
         Q_PROPERTY(double symbolLineWidth MEMBER m_symbolLineWidth READ getSymbolLineWidth WRITE setSymbolLineWidth)
+#endif
     private:
         /** \brief which symbol to use for the datapoints */
         JKQTPGraphSymbols m_symbolType;
@@ -393,7 +408,9 @@ class JKQTPLOTTER_LIB_EXPORT JKQTPGraphSymbolStyleMixin {
     .
  */
 class JKQTPLOTTER_LIB_EXPORT JKQTPGraphFillStyleMixin {
-        Q_GADGET
+#ifndef JKQTPLOTTER_WORKAROUND_QGADET_BUG
+      Q_GADGET
+#endif
     public:
         /** \brief class constructor */
         JKQTPGraphFillStyleMixin();
@@ -434,8 +451,10 @@ class JKQTPLOTTER_LIB_EXPORT JKQTPGraphFillStyleMixin {
         /** \brief sets a fill transformation */
         void setFillTransform(const QTransform& b);
 
+#ifndef JKQTPLOTTER_WORKAROUND_QGADET_BUG
         Q_PROPERTY(Qt::BrushStyle fillStyle MEMBER m_fillStyle READ getFillStyle WRITE setFillStyle)
         Q_PROPERTY(QColor fillColor MEMBER m_fillColor READ getFillColor WRITE setFillColor)
+#endif
 
         /** \brief constructs a QBrush from the graph fill styling properties */
         QBrush getFillBrush(JKQTPEnhancedPainter &painter, JKQTBasePlotter* parent) const;
@@ -453,7 +472,9 @@ class JKQTPLOTTER_LIB_EXPORT JKQTPGraphFillStyleMixin {
  *  \ingroup jkqtplotter_basegraphs_stylemixins
 */
 class JKQTPLOTTER_LIB_EXPORT JKQTPGraphLineAndFillStyleMixin: public JKQTPGraphFillStyleMixin, public JKQTPGraphLineStyleMixin {
-    Q_GADGET
+#ifndef JKQTPLOTTER_WORKAROUND_QGADET_BUG
+      Q_GADGET
+#endif
 public:
     /** \brief class constructor */
     JKQTPGraphLineAndFillStyleMixin();
@@ -473,8 +494,10 @@ public:
     bool doFillCurve() const;
 
 
+#ifndef JKQTPLOTTER_WORKAROUND_QGADET_BUG
     Q_PROPERTY(bool drawLine MEMBER m_drawLine READ getDrawLine WRITE setDrawLine)
     Q_PROPERTY(bool fillCurve MEMBER m_fillCurve READ getFillCurve WRITE setFillCurve)
+#endif
 private:
     /** \brief indicates whether to draw a line on the circumference of the described area (i.e. along the data points from \c xColumn and \c yColumn as well as \c xColumn and \c yColumn2 or not */
     bool m_drawLine;
@@ -494,7 +517,9 @@ private:
     .
  */
 class JKQTPLOTTER_LIB_EXPORT JKQTPGraphTextStyleMixin {
-        Q_GADGET
+#ifndef JKQTPLOTTER_WORKAROUND_QGADET_BUG
+      Q_GADGET
+#endif
     public:
         /** \brief class constructor */
         JKQTPGraphTextStyleMixin(JKQTBasePlotter *parent);
@@ -521,9 +546,11 @@ class JKQTPLOTTER_LIB_EXPORT JKQTPGraphTextStyleMixin {
 
 
 
+#ifndef JKQTPLOTTER_WORKAROUND_QGADET_BUG
         Q_PROPERTY(QColor textColor MEMBER m_textColor READ getTextColor WRITE setTextColor)
         Q_PROPERTY(double textFontSize MEMBER m_textFontSize READ getTextFontSize WRITE setTextFontSize)
         Q_PROPERTY(QString textFontName MEMBER m_textFontName READ getTextFontName WRITE setTextFontName)
+#endif
     private:
         /** \brief color of the text */
         QColor m_textColor;
diff --git a/lib/jkqtplotter/jkqtpimagetools.h b/lib/jkqtplotter/jkqtpimagetools.h
index 07c0a5641a..404a5e24c7 100644
--- a/lib/jkqtplotter/jkqtpimagetools.h
+++ b/lib/jkqtplotter/jkqtpimagetools.h
@@ -26,6 +26,7 @@
 #include <QStringList>
 #include "jkqtplotter/jkqtplotter_imexport.h"
 #include "jkqtcommon/jkqtpbasicimagetools.h"
+#include "jkqtplotter/jkqtplotter_configmacros.h"
 #include <cmath>
 #include <cfloat>
 #include <stdint.h>
@@ -41,7 +42,9 @@ class JKQTBasePlotter; // forward
     \ingroup jkqtplotter_imagelots_tools
  */
 class JKQTPLOTTER_LIB_EXPORT JKQTPColorPaletteStyleAndToolsMixin {
-        Q_GADGET
+#ifndef JKQTPLOTTER_WORKAROUND_QGADET_BUG
+      Q_GADGET
+#endif
     public:
 
         JKQTPColorPaletteStyleAndToolsMixin(JKQTBasePlotter *parent);
@@ -251,7 +254,9 @@ class JKQTPLOTTER_LIB_EXPORT JKQTPColorPaletteStyleAndToolsMixin {
     \ingroup jkqtplotter_imagelots_tools
  */
 class JKQTPLOTTER_LIB_EXPORT JKQTPColorPaletteWithModifierStyleAndToolsMixin : public JKQTPColorPaletteStyleAndToolsMixin {
-        Q_GADGET
+#ifndef JKQTPLOTTER_WORKAROUND_QGADET_BUG
+      Q_GADGET
+#endif
     public:
 
 
diff --git a/lib/jkqtplotter/jkqtpkeystyle.h b/lib/jkqtplotter/jkqtpkeystyle.h
index 9d9e5f4ab5..2a62f5b427 100644
--- a/lib/jkqtplotter/jkqtpkeystyle.h
+++ b/lib/jkqtplotter/jkqtpkeystyle.h
@@ -22,6 +22,7 @@
 
 #include "jkqtplotter/jkqtptools.h"
 #include "jkqtplotter/jkqtplotter_imexport.h"
+#include "jkqtplotter/jkqtplotter_configmacros.h"
 #include <QColor>
 #include <QString>
 #include <QSettings>
diff --git a/lib/jkqtplotter/jkqtplotter_configmacros.h b/lib/jkqtplotter/jkqtplotter_configmacros.h
index c222b4f551..0b1f989c5d 100644
--- a/lib/jkqtplotter/jkqtplotter_configmacros.h
+++ b/lib/jkqtplotter/jkqtplotter_configmacros.h
@@ -21,6 +21,7 @@
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
+#include <QtGlobal>
 
 /*! \def JKQTPLOTTER_COMPILE_WITHOUT_PRINTSUPPORT
     \ingroup jkqtpplottersupprt
@@ -44,7 +45,14 @@
 #  endif
 #endif
 
-
+#if defined(Q_CC_CLANG) && (QT_VERSION < QT_VERSION_CHECK(7, 0, 0))
+#  define JKQTPLOTTER_WORKAROUND_QGADET_BUG
+#  warning("deactivating some Q_GADGET-declarations due to a bug in Qt on CLANG: https://bugreports.qt.io/browse/QTBUG-104874")
+#else
+#  ifdef JKQTPLOTTER_WORKAROUND_QGADET_BUG
+#    undef JKQTPLOTTER_WORKAROUND_QGADET_BUG
+#  endif
+#endif
 
 
 #endif // JKQTPLOTTER_CONFIGMACROS_H
diff --git a/lib/jkqtplotter/jkqtplotterstyle.h b/lib/jkqtplotter/jkqtplotterstyle.h
index ac8ca60146..31accaf67b 100644
--- a/lib/jkqtplotter/jkqtplotterstyle.h
+++ b/lib/jkqtplotter/jkqtplotterstyle.h
@@ -22,6 +22,7 @@
 
 #include "jkqtplotter/jkqtptools.h"
 #include "jkqtplotter/jkqtplotter_imexport.h"
+#include "jkqtplotter/jkqtplotter_configmacros.h"
 #include <QColor>
 #include <QPainter>
 #include <QString>