1 files changed, 12 insertions, 0 deletions
diff --git a/src/gui/kernel/qsurfaceformat.cpp b/src/gui/kernel/qsurfaceformat.cpp
index d7dc0faceb..000d727380 100644
--- a/src/gui/kernel/qsurfaceformat.cpp
+++ b/src/gui/kernel/qsurfaceformat.cpp
@@ -41,6 +41,8 @@
 
 #include <QtCore/qatomic.h>
 #include <QtCore/QDebug>
+#include <QOpenGLContext>
+#include <QtGui/qguiapplication.h>
 
 #ifdef major
 #undef major
@@ -761,6 +763,16 @@ Q_GLOBAL_STATIC(QSurfaceFormat, qt_default_surface_format)
  */
 void QSurfaceFormat::setDefaultFormat(const QSurfaceFormat &format)
 {
+#ifndef QT_NO_OPENGL
+    if (qApp) {
+        QOpenGLContext *globalContext = QOpenGLContext::globalShareContext();
+        if (globalContext && globalContext->isValid()) {
+            qWarning("Warning: Setting a new default format with a different version or profile "
+                     "after the global shared context is created may cause issues with context "
+                     "sharing.");
+        }
+    }
+#endif
     *qt_default_surface_format() = format;
 }