Reduce verbosity for QT_XCB_GL_INTEGRATION=none

When QT_XCB_GL_INTEGRATION=none we were printing:

1) qt.xcb.glintegration: QT_XCB_GL_INTEGRATION is set to "none"
2) qt.xcb.glintegration: Choosing xcb gl-integration based on following priority ()
3) qt.xcb.glintegration: Failed to create xcb gl-integration

Omit line 2 (useless) and line 3 (misleading).

Change-Id: If5e65a5bc8cc4a1fa97858049a26aac9a9535950
Reviewed-by: Shawn Rutledge <shawn.rutledge@theqtcompany.com>

1 files changed, 11 insertions, 9 deletions

diff --git a/src/plugins/platforms/xcb/qxcbconnection.cpp b/src/plugins/platforms/xcb/qxcbconnection.cpp
index 4fee772cd6..e1e2ec5d24 100644
--- a/src/plugins/platforms/xcb/qxcbconnection.cpp
+++ b/src/plugins/platforms/xcb/qxcbconnection.cpp
@@ -653,17 +653,19 @@ QXcbConnection::QXcbConnection(QXcbNativeInterface *nativeInterface, bool canGra
         }
     }
 
-    qCDebug(QT_XCB_GLINTEGRATION) << "Choosing xcb gl-integration based on following priority\n" << glIntegrationNames;
-    for (int i = 0; i < glIntegrationNames.size() && !m_glIntegration; i++) {
-        m_glIntegration = QXcbGlIntegrationFactory::create(glIntegrationNames.at(i));
-        if (m_glIntegration && !m_glIntegration->initialize(this)) {
-            qCDebug(QT_XCB_GLINTEGRATION) << "Failed to initialize xcb gl-integration" << glIntegrationNames.at(i);
-            delete m_glIntegration;
-            m_glIntegration = Q_NULLPTR;
+    if (!glIntegrationNames.isEmpty()) {
+        qCDebug(QT_XCB_GLINTEGRATION) << "Choosing xcb gl-integration based on following priority\n" << glIntegrationNames;
+        for (int i = 0; i < glIntegrationNames.size() && !m_glIntegration; i++) {
+            m_glIntegration = QXcbGlIntegrationFactory::create(glIntegrationNames.at(i));
+            if (m_glIntegration && !m_glIntegration->initialize(this)) {
+                qCDebug(QT_XCB_GLINTEGRATION) << "Failed to initialize xcb gl-integration" << glIntegrationNames.at(i);
+                delete m_glIntegration;
+                m_glIntegration = Q_NULLPTR;
+            }
         }
+        if (!m_glIntegration)
+            qCDebug(QT_XCB_GLINTEGRATION) << "Failed to create xcb gl-integration";
     }
-    if (!m_glIntegration)
-        qCDebug(QT_XCB_GLINTEGRATION) << "Failed to create xcb gl-integration";
 
     sync();
 }