Error when executing Qt application on Win7: possible issue with libstdc++-6.dll?

I have a Qt project that is working well under Linux, and I am trying to run it under Windows 7 64 bit. I am using Qt 5.1.1 and mingw 4.8.

In order to create the executable starting from the .pro file, I followed the subsequent steps:
- run qmake.exe from directory Qt/5.1.1/mingw48_32/bin
- run mingw32-make.exe from directory Qt/Tools/mingw48_32/bin
- put all needed .dlls inside the folder with the freshly created .exe of my application. I took the .dlls from Qt/5.1.1/mingw48_32/bin. The libraries are:
-- icudt51.dll
-- icuin51.dll
-- icuuc51.dll
-- libstdc++-6.dll
-- libwinpthread-1.dll
-- Qt5Core.dll
-- Qt5Gui.dll
-- Qt5QWidgets.dll

When I try to run my application, it crashes immediately with the following error:

Quote:

---

Problem signature:
Problem Event Name: APPCRASH
Application Name: ugp3-population-inspector.exe
Application Version: 0.0.0.0
Application Timestamp: 529b97e7
Fault Module Name: libstdc++-6.dll
Fault Module Version: 0.0.0.0
Fault Module Timestamp: 516ee7b6
Exception Code: c0000005
Exception Offset: 00043f17
OS Version: 6.1.7601.2.1.0.768.3
Locale ID: 1036
Additional Information 1: 3a5f
Additional Information 2: 3a5f3876e9d420f8f9257cedd5068646
Additional Information 3: 58bf
Additional Information 4: 58bfe2891c811f25e4b9e96b50dd180b

---

So, it looks like there is some trouble with libstdc++-6.dll...but I don't really understand the issue.

Can anyone help me? Thanks in advance :-)

Code:

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Exception Code: c0000005

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Is "Access violation" as a quick Google search will tell you. The code is almost certainly accessing a zero, uninitialised, or already freed pointer.

You also need to complete the deployment with the MingW runtime library (MINGWM10.DLL), "platforms/qwindows.dll" plugin for Windows, and the ANGLE related dlls (3 of them I think). Do that first as you will not get much further without them.
http://qt-project.org/doc/qt-5.0/qtd...cation-package

Thanks for your help!

I've added all the .dlls, but I am still getting the same error.

I tried to proceed in a different way: I loaded my .pro in Qt Creator, I cleaned/re-built it and I tried to run it from there...but again, I got the same error.

EDIT: As a comparison, I also tried to run some programs from the "examples" folder in Qt/5.1.1, and Qt Creator was able to load, compile and execute them correctly.

What could be the issue?

Quote:

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As a comparison, I also tried to run some programs from the "examples" folder in Qt/5.1.1, and Qt Creator was able to load, compile and execute them correctly.

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Yes, because these programs do not have any "Access violation" bugs. Run debug version of your project under debugger and post stack trace after the crash.

Ok, I ran the Qt Center debugger, and here is what I got (see attached screenshot)

"Level 0" in the window is libstdc++-6.dll inside the folder where the executable is.

Attachment 9828

Can you post the content of main.cpp ? Line no. 12 in particular :)

Code:

---

#include "ui_ugp3-population-inspector.h"
#include "MicroGPMainWindow.h"
#include "MicroGPApplication.h"
 
using namespace std;
using namespace Ui;
 
// main
int main(int argc, char* argv[])
{
	// create application
	MicroGPApplication app(argc, argv); 
	// create widget that will be used as anchor for the ugp3.ui interface
	QMainWindow* mainWindow = new QMainWindow;
	// create window class defined by the ugp3.ui file
	MicroGPMainWindow ugp3Window;
 
	// bind window to widget
	ugp3Window.setupUi(mainWindow);
 
	// show window
	mainWindow->show();
 
	// return exit value of the application
	return app.exec();
}

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Here it is! Apparently, the program crashes when it tries to create a MicroGPApplication object (which is a class inherited from QApplication). Here is the code for the MicroGPApplication class (it's just a header file):

Code:

---

#ifndef MICROGPAPPLICATION
#define MICROGPAPPLICATION
 
#include <QtGui>
#include <QApplication>
#include <QMessageBox>
 
class MicroGPApplication : public QApplication
{
public:
	MicroGPApplication(int& argc, char ** argv) : QApplication(argc, argv) { }
	virtual ~MicroGPApplication() { }
 
	// reimplemented from QApplication so we can throw exceptions in slots
	virtual bool notify(QObject * receiver, QEvent * event)
	{
    		try 
		{
      			return QApplication::notify(receiver, event);
    		}
		catch(std::exception& e) 
		{
			QMessageBox::warning( 0, tr("An error occurred"), e.what() );
    		}	
 
		return false;
  	}
};
 
#endif

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Added after 22 minutes:

Just a quick update: I finally managed to solve the issue. I have another system with Win7 64-bit, I just installed Qt 5.1.1 along with mingw 4.8, and - after a minor tweaking with the .pro - Qt Creator was able to successfully build and run the program.

On the other system, I had a separate, different version of mingw already installed when I installed Qt 5.1.1; so, my guess is that there was some kind of issue between the two versions (and probably the folders of *both* were inside PATH).

Thanks everyone for your help! :-)