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POSimple Qt program builds but doesn't show output
 

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    <p>I have just started learning Qt and tried to compile and run a simple program of hello world. The program builds without any issues and gives this output in <code>compiler output</code></p> <pre> Starting: /qtbuild/bin/qmake /home/ved/Qt/train1/train1.pro -spec /qtbuild/mkspecs/qws/linux-arm-g++ -r CONFIG+=debug Exited with code 0. Starting: /usr/bin/make -w make: Entering directory `/home/ved/Qt/train1' make: Nothing to be done for `first'. make: Leaving directory `/home/ved/Qt/train1' Exited with code 0. </pre> <p>but on trying to run the program, it only displays this:</p> <pre> Starting /home/ved/Qt/train1/train1... /home/ved/Qt/train1/train1 exited with code 255 </pre> <p>My code:</p> <pre> #include #include int main(int argc, char *argv[]) { QCoreApplication a(argc, argv); QLabel *label = new QLabel("Hello World!!!"); label->show(); return a.exec(); } </pre> <p>I am completely new to Qt building procedure and can't understand what is wrong.</p> <h1>Update</h1> <p>tried changing <code>QCoreApplication</code> to <code>QApplication</code>. No change.</p> <pre> Running build steps for project train1... Starting: /qtbuild//bin/qmake /home/ved/Qt/train1/train1.pro -spec /qtbuild/mkspecs/qws/linux-arm-g++ -r CONFIG+=debug Exited with code 0. Starting: /usr/bin/make -w make: Entering directory `/home/ved/Qt/train1' arm-linux-g++ -c -pipe -g -Wall -W -D_REENTRANT -DQT_GUI_LIB -DQT_NETWORK_LIB -DQT_CORE_LIB -DQT_SHARED -I/qtbuild/mkspecs/qws/linux-arm-g++ -I. -I/qtbuild/include/QtCore -I/qtbuild/include/QtNetwork -I/qtbuild/include/QtGui -I/qtbuild/include -I. -I/usr/local/tslib-arm/include -o main.o main.cpp In file included from /qtbuild/include/QtCore/qobject.h:48, from /qtbuild/include/QtCore/qiodevice.h:46, from /qtbuild/include/QtCore/qxmlstream.h:45, from /qtbuild/include/QtCore/QtCore:3, from main.cpp:1: /qtbuild/include/QtCore/qstring.h:91: note: the mangling of 'va_list' has changed in GCC 4.4 arm-linux-g++ -Wl,-rpath,/qtbuild/lib -o train1 main.o -L/usr/local/tslib-arm/lib -L/qtbuild//lib -lQtGui -L/qtbuild//lib -L/usr/local/tslib-arm/lib -lQtNetwork -lQtCore -lpthread make: Leaving directory `/home/ved/Qt/train1' Exited with code 0. </pre> <p>I use Qt 4.6.3.</p>
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