Unable to debug on OSX Yosemite - XCode 6.4

[oohogwash]

I have installed Qt Creator 3.3.2 on OSX Yosemite which XCode 6.4 beta installed. Its saying QT Creator is built with CLang 6 (Apple) 64bit.
I have found that if I run a small C++ console app which segfault error in runtime it shuts the program down with no indication of the critical error. I would have preferred a way to see the fault and know it was a fault.

I run in debug mode, I get the following text in a dialog:
Python quit unexpectedly while using the _lldb.so plug-in. It asks to ignore report reopen etc, none of which help.
I believe the library is incompatible with Yosemite from search but have not been able to build yet due to issues with the XCode (my not knowing what to do, its a basic install that I have never used)

I want to get debugging working for obvious reasons...
Any help on getting this up and running appreciated. I dont mind reinstalling if I have selected wrong installs.