[osg-submissions] Qt 3 vs 4 under linux

[Mathieu MARACHE]

Hi Robert,

I recall having the problem discussed on the osg-build list. But since
we had a no-go, here I go again.

I need to build OpenSceneGraph without human intervention and the
FindQt3 followed by a FindQt4 leads to a mixed (Qt3/Qt4) settings of
the flags making the example osgviewerQT to fail it's compilation...
The CMake solution for Qt is to set the value of DESIRED_QT_VERSION to
either 3 or 4 and use FindQt . However our last discussion on this
issue lead to leaving my input commented out in the root
CMakeList.txt, it was fine for me but not the optimum solution.

I now come back with a slight modification making a call to cmake with
the appropriate flag to work like I'd like to but wihtout, then it
would work just the same as before. Please consider this for svn
checkin :

===================================================================
--- CMakeLists.txt      (révision 7470)
+++ CMakeLists.txt      (copie de travail)
@@ -179,10 +179,12 @@
 FIND_PACKAGE(ZLIB)
 FIND_PACKAGE(GDAL)

-# SET(DESIRED_QT_VERSION 3)
-# FIND_PACKAGE(Qt)
-FIND_PACKAGE(Qt3)
-FIND_PACKAGE(Qt4)
+IF(DESIRED_QT_VERSION)
+       FIND_PACKAGE(Qt)
+ELSE(DESIRED_QT_VERSION)
+       FIND_PACKAGE(Qt3)
+       FIND_PACKAGE(Qt4)
+ENDIF(DESIRED_QT_VERSION)

 SET(wxWidgets_USE_LIBS base core gl net)
 FIND_PACKAGE(wxWidgets)
====================================================================

Then calling 'cmake -DDESIRED_QT_VERSION=4 ... '  triggers the patch



Regards,
-- 
Mathieu
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