root@qemux86:~# gdb helloScriptEngine 

warning: Can not parse XML syscalls information; XML support was disabled at compile time.
GNU gdb (GDB) 7.0
Copyright (C) 2009 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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Reading symbols from /home/root/helloScriptEngine...done.
(gdb) run
Starting program: /home/root/helloScriptEngine 
warning: Unable to find libthread_db matching inferior's thread library, thread debugging will not be available.
warning: Unable to find libthread_db matching inferior's thread library, thread debugging will not be available.
warning: Unable to find libthread_db matching inferior's thread library, thread debugging will not be available.
warning: Unable to find libthread_db matching inferior's thread library, thread debugging will not be available.
warning: Unable to find libthread_db matching inferior's thread library, thread debugging will not be available.
warning: Unable to find libthread_db matching inferior's thread library, thread debugging will not be available.
warning: Unable to find libthread_db matching inferior's thread library, thread debugging will not be available.
warning: Unable to find libthread_db matching inferior's thread library, thread debugging will not be available.
warning: Unable to find libthread_db matching inferior's thread library, thread debugging will not be available.
warning: Unable to find libthread_db matching inferior's thread library, thread debugging will not be available.
warning: Unable to find libthread_db matching inferior's thread library, thread debugging will not be available.

Program received signal SIGSEGV, Segmentation fault.
0xb81c7abb in ?? ()
(gdb) bt
#0  0xb81c7abb in ?? ()
#1  0xb7e77852 in QTJSC::JITCode::execute (this=0xb6466488, eval=0xbffffc6c, 
    callFrame=0x8050294, thisObj=0xb5fc0000, globalRegisterOffset=9, 
    scopeChain=0xb64a11c8, exception=0xbffffbd8)
    at ../3rdparty/javascriptcore/JavaScriptCore/jit/JITCode.h:79
#2  QTJSC::Interpreter::execute (this=0xb6466488, eval=0xbffffc6c, 
    callFrame=0x8050294, thisObj=0xb5fc0000, globalRegisterOffset=9, 
    scopeChain=0xb64a11c8, exception=0xbffffbd8)
    at ../3rdparty/javascriptcore/JavaScriptCore/interpreter/Interpreter.cpp:921
#3  0xb7e77b3b in QTJSC::Interpreter::execute (this=0xb6466488, 
    eval=0xbffffc6c, callFrame=0x8050294, thisObj=0xb5fc0000, 
    scopeChain=0xb64a11c8, exception=0xbffffbd8)
    at ../3rdparty/javascriptcore/JavaScriptCore/interpreter/Interpreter.cpp:838
#4  0xb7f6de7b in QScriptEnginePrivate::evaluateHelper (this=0x804fd98, 
    exec=0x8050294, sourceId=-1236658544, executable=0xbffffc6c, 
    compile=@0xbffffcb7) at api/qscriptengine.cpp:1203
#5  0xb7f6eaed in QScriptEngine::evaluate (this=0xbffffd08, program=..., 
    fileName=..., lineNumber=1) at api/qscriptengine.cpp:2199
#6  0x08048f0c in main (argc=0, argv=0xbffffbd8) at hello.cpp:16