From 1e0d682979ef955adbd9c3c18271a0b23fe65551 Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Mon, 15 Jun 2015 19:59:01 +0000
Subject: [PATCH] From Jannik Heller, "I've added the check for Qt version
 mismatches into osgQt as suggested in
 http://forum.openscenegraph.org/viewtopic.php?t=14999.

When an application is built with Qt4, but osgQt was built with Qt5 (or vice versa), upon #includeing osgQt users will receive an #error aborting the build.

This at least provides a proper error message rather than a crash, while we are working on better fixes for the problem."


git-svn-id: http://svn.openscenegraph.org/osg/OpenSceneGraph/trunk@14918 16af8721-9629-0410-8352-f15c8da7e697
---
 include/osgQt/GraphicsWindowQt     |  1 +
 include/osgQt/QFontImplementation  |  1 +
 include/osgQt/QGraphicsViewAdapter |  1 +
 include/osgQt/QWebViewImage        |  1 +
 include/osgQt/QWidgetImage         |  1 +
 src/osgQt/CMakeLists.txt           |  6 ++++++
 src/osgQt/Version.in               | 12 ++++++++++++
 7 files changed, 23 insertions(+)
 create mode 100644 src/osgQt/Version.in

diff --git a/include/osgQt/GraphicsWindowQt b/include/osgQt/GraphicsWindowQt
index 30924675c..09bbac9f6 100644
--- a/include/osgQt/GraphicsWindowQt
+++ b/include/osgQt/GraphicsWindowQt
@@ -18,6 +18,7 @@
 
 #include <osgViewer/GraphicsWindow>
 #include <osgQt/Export>
+#include <osgQt/Version>
 
 #include <QMutex>
 #include <QEvent>
diff --git a/include/osgQt/QFontImplementation b/include/osgQt/QFontImplementation
index 4bc45dc7e..36942c22e 100644
--- a/include/osgQt/QFontImplementation
+++ b/include/osgQt/QFontImplementation
@@ -15,6 +15,7 @@
 
 #include <osgText/Font>
 #include <osgQt/Export>
+#include <osgQt/Version>
 
 #include <QtGui/QFont>
 
diff --git a/include/osgQt/QGraphicsViewAdapter b/include/osgQt/QGraphicsViewAdapter
index 8a8a483c3..62fd46496 100644
--- a/include/osgQt/QGraphicsViewAdapter
+++ b/include/osgQt/QGraphicsViewAdapter
@@ -19,6 +19,7 @@
 #include <osg/Image>
 #include <osg/observer_ptr>
 #include <osgQt/Export>
+#include <osgQt/Version>
 
 #include <QPointer>
 #include <QGraphicsScene>
diff --git a/include/osgQt/QWebViewImage b/include/osgQt/QWebViewImage
index de9e383aa..24d48c7e0 100644
--- a/include/osgQt/QWebViewImage
+++ b/include/osgQt/QWebViewImage
@@ -26,6 +26,7 @@
 
 #include <osgWidget/Browser>
 #include <osgQt/QGraphicsViewAdapter>
+#include <osgQt/Version>
 
 namespace osgQt
 {
diff --git a/include/osgQt/QWidgetImage b/include/osgQt/QWidgetImage
index 89e4b2a4a..a64948de8 100644
--- a/include/osgQt/QWidgetImage
+++ b/include/osgQt/QWidgetImage
@@ -15,6 +15,7 @@
 #define QWIDGETIMAGE
 
 #include <osgQt/QGraphicsViewAdapter>
+#include <osgQt/Version>
 #include <osg/Image>
 
 namespace osgQt
diff --git a/src/osgQt/CMakeLists.txt b/src/osgQt/CMakeLists.txt
index d631dccbf..e3b80aca1 100644
--- a/src/osgQt/CMakeLists.txt
+++ b/src/osgQt/CMakeLists.txt
@@ -15,10 +15,15 @@ SET(SOURCES_H
 IF ( Qt5Widgets_FOUND )
     QT5_WRAP_CPP( SOURCES_H_MOC ${SOURCES_H} OPTIONS
           "-fosgQt/QGraphicsViewAdapter" )
+    set(OSGQT_QT_VERSION 5)
 ELSE()
     QT4_WRAP_CPP( SOURCES_H_MOC ${SOURCES_H} OPTIONS "-f" )
+    set(OSGQT_QT_VERSION 4)
 ENDIF()
 
+SET(OSGQT_VERSION_HEADER "${PROJECT_BINARY_DIR}/include/osgQt/Version")
+CONFIGURE_FILE("${CMAKE_CURRENT_SOURCE_DIR}/Version.in" ${OSGQT_VERSION_HEADER})
+
 SET(TARGET_H
     ${HEADER_PATH}/Export
     ${HEADER_PATH}/GraphicsWindowQt
@@ -26,6 +31,7 @@ SET(TARGET_H
     ${HEADER_PATH}/QGraphicsViewAdapter
     ${HEADER_PATH}/QWidgetImage
     ${HEADER_PATH}/QWebViewImage
+    ${OSGQT_VERSION_HEADER}
 )
 
 
diff --git a/src/osgQt/Version.in b/src/osgQt/Version.in
new file mode 100644
index 000000000..dc1a673e2
--- /dev/null
+++ b/src/osgQt/Version.in
@@ -0,0 +1,12 @@
+#ifndef OSGQT_VERSION
+#define OSGQT_VERSION
+
+#define OSGQT_QT_VERSION @OSGQT_QT_VERSION@
+
+#include <QtGlobal>
+#if (QT_VERSION < QT_VERSION_CHECK(OSGQT_QT_VERSION,0,0))
+#error "Qt version mismatch detected! Make sure to compile applications using osgQt with the same major Qt version that osgQt has been compiled against."
+#endif
+
+
+#endif