#include <QApplication>
#include <QPushButton>

int
main (int argc, char *argv[])
{
	QApplication app (argc, argv);

	QPushButton hello ("hello world!");

	hello.show ();
	return app.exec();
}

output:
[sbox-FREMANTLE_X86: /scratchbox/users/mm4/home/user/Qt/Qt/prac-code/window-prog/hello] > qmake -project
QFileInfo::absolutePath: Constructed with empty filename
[sbox-FREMANTLE_X86: /scratchbox/users/mm4/home/user/Qt/Qt/prac-code/window-prog/hello] > qmake
[sbox-FREMANTLE_X86: /scratchbox/users/mm4/home/user/Qt/Qt/prac-code/window-prog/hello] > make
g++ -c -pipe -O2 -Wall -W -D_REENTRANT -DQT_NO_DEBUG -DQT_GUI_LIB -DQT_CORE_LIB -DQT_SHARED -I/targets/FREMANTLE_X86/usr/share/qt4/mkspecs/linux-g++ -I. -I/targets/FREMANTLE_X86/usr/include/QtCore -I/targets/FREMANTLE_X86/usr/include/QtGui -I/targets/FREMANTLE_X86/usr/include -I. -I. -o helloworld.o helloworld.cpp
g++ -Wl,-O1 -Wl,-rpath,/usr/lib -o hello helloworld.o    -L/usr/lib -lQtGui -L/usr/lib -L/usr/X11R6/lib -lQtCore -lpthread

[sbox-FREMANTLE_X86: /scratchbox/users/mm4/home/user/Qt/Qt/prac-code/window-prog/hello] > run-standalone.sh ./hello
/usr/bin/run-standalone.sh: line 11:  4229 Floating point exception(core dumped) "$@"
[sbox-FREMANTLE_X86: /scratchbox/users/mm4/home/user/Qt/Qt/prac-code/window-prog/hello] >

error: /usr/bin/run-standalone.sh: line 11:  4229 Floating point exception(core dumped) "$@"

If i tried only this much code

int
main () {}

Then same happens as above.