It seems I'm not able anymore to load my existing c++ projects, nor create new ones. I've tried to uninstall and then reinstall all my eclipse environment few times. I've also tried to rollback to the previous yum transaction. The c perspective is absent. I've tried also to issue eclipse with the -clean switch. But no hope for the time being. The last cdt update is about eclipse-cdt 8.3.0-2 x86_64 and was performed on 2015-03-22.