Make GLX and EGL dynamic dependencies for xcb

[ChangeLog][QPA][Xcb] GLX and EGL code paths are now dynamically
resolved, making it possible for one build of a plugin to use both code
paths. Default is to use the GLX code path if available. This can be
overwritten by specifying QT_XCB_GL_INTEGRATION=xcb_egl as an
evnironment variable. Enable qt.xcb.glintegration.debug to get debug log
output of what integration is used

Change-Id: Ia9fa95fcca3d901b91dadb8c98a695fea0ae3b1e
Reviewed-by: Laszlo Agocs <laszlo.agocs@theqtcompany.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/src/plugins/platforms/xcb/qxcbintegration.h b/src/plugins/platforms/xcb/qxcbintegration.h
index 5d73191097..150e3d57cb 100644
--- a/src/plugins/platforms/xcb/qxcbintegration.h
+++ b/src/plugins/platforms/xcb/qxcbintegration.h
@@ -37,6 +37,8 @@
 #include <qpa/qplatformintegration.h>
 #include <qpa/qplatformscreen.h>
 
+#include "qxcbexport.h"
+
 QT_BEGIN_NAMESPACE
 
 class QXcbConnection;
@@ -44,7 +46,7 @@ class QAbstractEventDispatcher;
 class QXcbNativeInterface;
 class QXcbScreen;
 
-class QXcbIntegration : public QPlatformIntegration
+class Q_XCB_EXPORT QXcbIntegration : public QPlatformIntegration
 {
 public:
     QXcbIntegration(const QStringList &parameters, int &argc, char **argv);