Qt Creator 2.0.1 does not work with gdb 6.8 on Window/MinGW. There's a python enabled gdb 7.0.1 (or even 7.1?) packed in the SDK. Point your debugger settings in Tools->Options->Debugger there.
cdb is only used and useful if you use Qt Creator with a Qt compiled with the Microsoft Compiler. The SDK contains a Qt compiled with MinGW.
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