Dear all,


I am rather new to Qt and I am working on an application in which I have several ui-files which contain QSpinboxes. Those ui-files were generated while still using Qt 4.8.4-1. Now, I am using 5.4.1 (with Visual Studio 2012 and CMake) and I have observed the following strange behaviour which was not there while still working with Qt 4.8.4-1:
When running the following code in DEBUG mode, then I get a runtime error "... has triggered a breakpoint". It is triggered after leaving the main method. There is no runtime error when running it in RELEASE.


Qt Code: 
  1. #include <QApplication>
  2. #include <QWidget>
  3. #include <QSpinBox>
  4. #include <qnamespace.h>
  5. #include <QFlags>
  6.  
  7. int main(int argc, char *argv[])
  8. {
  9.     int i=777;  //some random value
  10.  
  11.     QApplication app(argc, argv);
  12.  
  13.  
  14.     QSpinBox *sbxDuration = new QSpinBox();
  15.  
  16.     //Call QSpinBox members
  17.     //sbxDuration->setMinimum(1);      // causes runtime error "... has triggered a breakpoint"
  18.     sbxDuration->setMaximum(2);        // does not trigger the runtime error 
  19.     //sbxDuration->setValue(1);      // causes runtime error "... has triggered a breakpoint"
  20.     //sbxDuration->setSingleStep(0);      // causes runtime error "... has triggered a breakpoint"
  21.  
  22.  
  23.     //Call QAbstractSpinBox members (none of these calls cause the runtime error)
  24.     sbxDuration->setWrapping(true);
  25.     sbxDuration->setFrame(true);
  26.     QFlags<Qt::AlignmentFlag> flg; 
  27.     sbxDuration->setAlignment(flg);
  28.     sbxDuration->setReadOnly(true);
  29.     sbxDuration->setButtonSymbols(QAbstractSpinBox::NoButtons);
  30.     sbxDuration->setAccelerated(false);
  31.     sbxDuration->setCorrectionMode(QAbstractSpinBox::CorrectToPreviousValue);
  32.  
  33.  
  34.     delete sbxDuration;
  35.  
  36.     return i;
  37.  
  38. }
  39. // this results in 
  40. // "... has exited with code 0 (0x0)." if runtime error occurs
  41. // "has exited with code 777 (0x309)." if no runtime error
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I added a new system variable called “_NO_DEBUG_HEAP” with a value of “1” to Control Panel->System Properties->Advanced System Settings->Environment Variables->System Variables (http://stackoverflow.com/questions/6...-no-debug-heap). However, that did not help.
My concern is that even if in my minimal example it seems to be only a problem in DEBUG mode, it will be a problem in the "real" application that I am working on.

Does anybody have an idea how to locate the error?!?

Thanks in advence!