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04-20-2002, 09:31 AM
Why is it when I try to compile this program from a qt tutorial




#include <qapplication.h>
#include <qpushbutton.h>
int main( int argc, char **argv )
{
QApplication a( argc, argv ); QPushButton hello( "Hello world!", 0 );
hello.resize( 100, 30 ); a.setMainWidget( &hello );
hello.show();
return a.exec();
}





I compile it by typing

[barrie@localhost barrie]$ g++ -I/usr/local/qt/include test.cpp

I then get this output.


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/tmp/ccxDBCSi.o: In function `main':
/tmp/ccxDBCSi.o(.text+0x1a): undefined reference to `QApplication::QApplication(int &, char **)' /tmp/ccxDBCSi.o(.text+0x31): undefined reference to `QString::QString(char const *)'
/tmp/ccxDBCSi.o(.text+0x4d): undefined reference to `QPushButton::QPushButton(QString const &, QWidget *, char const *)'
/tmp/ccxDBCSi.o(.text+0x83): undefined reference to `QPushButton::resize(int, int)'
/tmp/ccxDBCSi.o(.text+0x99): undefined reference to `QApplication::setMainWidget(QWidget *)'
/tmp/ccxDBCSi.o(.text+0xab): undefined reference to `QWidget::show(void)'
/tmp/ccxDBCSi.o(.text+0xba): undefined reference to `QApplication::exec(void)'
/tmp/ccxDBCSi.o(.text+0xd0): undefined reference to `QPushButton::~QPushButton(void)'
/tmp/ccxDBCSi.o(.text+0xe1): undefined reference to `QApplication::~QApplication(void)'
/tmp/ccxDBCSi.o(.text+0x12d): undefined reference to `QPushButton::~QPushButton(void)'
/tmp/ccxDBCSi.o(.text+0x140): undefined reference to `QApplication::~QApplication(void)'
/tmp/ccxDBCSi.o(.rodata+0x108): undefined reference to `QDropEvent type_info node'
/tmp/ccxDBCSi.o: In function `QMemArray<char> type_info function':
/tmp/ccxDBCSi.o(.gnu.linkonce.t.__tft9QMemArray1Zc+0x10 ): undefined reference to `QGArray type_info function'
/tmp/ccxDBCSi.o(.gnu.linkonce.t.__tft9QMemArray1Zc+0x1a ): undefined reference to `QGArray type_info node'
/tmp/ccxDBCSi.o: In function `QTextIStream type_info function':
/tmp/ccxDBCSi.o(.gnu.linkonce.t.__tf12QTextIStream+0x10 ): undefined reference to `QTextStream type_info function'
/tmp/ccxDBCSi.o(.gnu.linkonce.t.__tf12QTextIStream+0x1a ): undefined reference to `QTextStream type_info node'
/tmp/ccxDBCSi.o: In function `QTextOStream type_info function':
/tmp/ccxDBCSi.o(.gnu.linkonce.t.__tf12QTextOStream+0x10 ): undefined reference to `QTextStream type_info function'
/tmp/ccxDBCSi.o(.gnu.linkonce.t.__tf12QTextOStream+0x1a ): undefined reference to `QTextStream type_info node'
/tmp/ccxDBCSi.o: In function `QTimerEvent type_info function':
/tmp/ccxDBCSi.o(.gnu.linkonce.t.__tf11QTimerEvent+0x10) : undefined reference to `QEvent type_info function'
/tmp/ccxDBCSi.o(.gnu.linkonce.t.__tf11QTimerEvent+0x1a) : undefined reference to `QEvent type_info node'
/tmp/ccxDBCSi.o: In function `QMouseEvent type_info function':
/tmp/ccxDBCSi.o(.gnu.linkonce.t.__tf11QMouseEvent+0x10) : undefined reference to `QEvent type_info function'
/tmp/ccxDBCSi.o(.gnu.linkonce.t.__tf11QMouseEvent+0x1a) : undefined reference to `QEvent type_info node'
/tmp/ccxDBCSi.o: In function `QWheelEvent type_info function':
/tmp/ccxDBCSi.o(.gnu.linkonce.t.__tf11QWheelEvent+0x10) : undefined reference to `QEvent type_info function'
/tmp/ccxDBCSi.o(.gnu.linkonce.t.__tf11QWheelEvent+0x1a) : undefined reference to `QEvent type_info node'
/tmp/ccxDBCSi.o: In function `QTabletEvent type_info function':
/tmp/ccxDBCSi.o(.gnu.linkonce.t.__tf12QTabletEvent+0x10 ): undefined reference to `QEvent type_info function'
/tmp/ccxDBCSi.o(.gnu.linkonce.t.__tf12QTabletEvent+0x1a ): undefined reference to `QEvent type_info node'
/tmp/ccxDBCSi.o: In function `QKeyEvent type_info function':
/tmp/ccxDBCSi.o(.gnu.linkonce.t.__tf9QKeyEvent+0x10): undefined reference to `QEvent type_info function'
/tmp/ccxDBCSi.o(.gnu.linkonce.t.__tf9QKeyEvent+0x1a): undefined reference to `QEvent type_info node'
/tmp/ccxDBCSi.o: In function `QFocusEvent type_info function':
/tmp/ccxDBCSi.o(.gnu.linkonce.t.__tf11QFocusEvent+0x10) : undefined reference to `QEvent type_info function'
/tmp/ccxDBCSi.o(.gnu.linkonce.t.__tf11QFocusEvent+0x1a) : undefined reference to `QEvent type_info node'
/tmp/ccxDBCSi.o: In function `QPaintEvent type_info function':
/tmp/ccxDBCSi.o(.gnu.linkonce.t.__tf11QPaintEvent+0x10) : undefined reference to `QEvent type_info function'
/tmp/ccxDBCSi.o(.gnu.linkonce.t.__tf11QPaintEvent+0x1a) : undefined reference to `QEvent type_info node'
/tmp/ccxDBCSi.o: In function `QMoveEvent type_info function':
/tmp/ccxDBCSi.o(.gnu.linkonce.t.__tf10QMoveEvent+0x10): undefined reference to `QEvent type_info function'
/tmp/ccxDBCSi.o(.gnu.linkonce.t.__tf10QMoveEvent+0x1a): undefined reference to `QEvent type_info node'
/tmp/ccxDBCSi.o: In function `QResizeEvent type_info function':
/tmp/ccxDBCSi.o(.gnu.linkonce.t.__tf12QResizeEvent+0x10 ): undefined reference to `QEvent type_info function'
/tmp/ccxDBCSi.o(.gnu.linkonce.t.__tf12QResizeEvent+0x1a ): undefined reference to `QEvent type_info node'
/tmp/ccxDBCSi.o: In function `QCloseEvent type_info function':
/tmp/ccxDBCSi.o(.gnu.linkonce.t.__tf11QCloseEvent+0x10) : undefined reference to `QEvent type_info function'
/tmp/ccxDBCSi.o(.gnu.linkonce.t.__tf11QCloseEvent+0x1a) : undefined reference to `QEvent type_info node'
/tmp/ccxDBCSi.o: In function `QShowEvent type_info function':
/tmp/ccxDBCSi.o(.gnu.linkonce.t.__tf10QShowEvent+0x10): undefined reference to `QEvent type_info function'
/tmp/ccxDBCSi.o(.gnu.linkonce.t.__tf10QShowEvent+0x1a): undefined reference to `QEvent type_info node'
/tmp/ccxDBCSi.o: In function `QHideEvent type_info function':
/tmp/ccxDBCSi.o(.gnu.linkonce.t.__tf10QHideEvent+0x10): undefined reference to `QEvent type_info function'
/tmp/ccxDBCSi.o(.gnu.linkonce.t.__tf10QHideEvent+0x1a): undefined reference to `QEvent type_info node'
/tmp/ccxDBCSi.o: In function `QContextMenuEvent type_info function':
/tmp/ccxDBCSi.o(.gnu.linkonce.t.__tf17QContextMenuEvent +0x10): undefined reference to `QEvent type_info function'
/tmp/ccxDBCSi.o(.gnu.linkonce.t.__tf17QContextMenuEvent +0x1a): undefined reference to `QEvent type_info node'
/tmp/ccxDBCSi.o: In function `QIMEvent type_info function':
/tmp/ccxDBCSi.o(.gnu.linkonce.t.__tf8QIMEvent+0x10): undefined reference to `QEvent type_info function'
/tmp/ccxDBCSi.o(.gnu.linkonce.t.__tf8QIMEvent+0x1a): undefined reference to `QEvent type_info node'
/tmp/ccxDBCSi.o: In function `QDragMoveEvent type_info function':
/tmp/ccxDBCSi.o(.gnu.linkonce.t.__tf14QDragMoveEvent+0x 10): undefined reference to `QDropEvent type_info function'
/tmp/ccxDBCSi.o: In function `QDragResponseEvent type_info function':
/tmp/ccxDBCSi.o(.gnu.linkonce.t.__tf18QDragResponseEven t+0x10): undefined reference to `QEvent type_info function'
/tmp/ccxDBCSi.o(.gnu.linkonce.t.__tf18QDragResponseEven t+0x1a): undefined reference to `QEvent type_info node'
/tmp/ccxDBCSi.o: In function `QDragLeaveEvent type_info function':
/tmp/ccxDBCSi.o(.gnu.linkonce.t.__tf15QDragLeaveEvent+0 x10): undefined reference to `QEvent type_info function'
/tmp/ccxDBCSi.o(.gnu.linkonce.t.__tf15QDragLeaveEvent+0 x1a): undefined reference to `QEvent type_info node'
/tmp/ccxDBCSi.o: In function `QChildEvent type_info function':
/tmp/ccxDBCSi.o(.gnu.linkonce.t.__tf11QChildEvent+0x10) : undefined reference to `QEvent type_info function'
/tmp/ccxDBCSi.o(.gnu.linkonce.t.__tf11QChildEvent+0x1a) : undefined reference to `QEvent type_info node'
/tmp/ccxDBCSi.o: In function `QCustomEvent type_info function':
/tmp/ccxDBCSi.o(.gnu.linkonce.t.__tf12QCustomEvent+0x10 ): undefined reference to `QEvent type_info function'
/tmp/ccxDBCSi.o(.gnu.linkonce.t.__tf12QCustomEvent+0x1a ): undefined reference to `QEvent type_info node'
/tmp/ccxDBCSi.o: In function `QSenderObject type_info function':
/tmp/ccxDBCSi.o(.gnu.linkonce.t.__tf13QSenderObject+0x1 0): undefined reference to `QObject type_info function'
/tmp/ccxDBCSi.o(.gnu.linkonce.t.__tf13QSenderObject+0x1 a): undefined reference to `QObject type_info node'
/tmp/ccxDBCSi.o: In function `QAsciiDict<void> type_info function':
/tmp/ccxDBCSi.o(.gnu.linkonce.t.__tft10QAsciiDict1Zv+0x 10): undefined reference to `QGDict type_info function'
/tmp/ccxDBCSi.o(.gnu.linkonce.t.__tft10QAsciiDict1Zv+0x 1a): undefined reference to `QGDict type_info node'
/tmp/ccxDBCSi.o: In function `QPtrList<void> type_info function':
/tmp/ccxDBCSi.o(.gnu.linkonce.t.__tft8QPtrList1Zv+0x10) : undefined reference to `QGList type_info function'
/tmp/ccxDBCSi.o(.gnu.linkonce.t.__tft8QPtrList1Zv+0x1a) : undefined reference to `QGList type_info node'
/tmp/ccxDBCSi.o: In function `QPtrList<char> type_info function':
/tmp/ccxDBCSi.o(.gnu.linkonce.t.__tft8QPtrList1Zc+0x10) : undefined reference to `QGList type_info function'
/tmp/ccxDBCSi.o(.gnu.linkonce.t.__tft8QPtrList1Zc+0x1a) : undefined reference to `QGList type_info node'
/tmp/ccxDBCSi.o: In function `QString::~QString(void)':
/tmp/ccxDBCSi.o(.gnu.linkonce.t._._7QString+0x26): undefined reference to `QString::shared_null'
/tmp/ccxDBCSi.o(.gnu.linkonce.t._._7QString+0x2e): undefined reference to `QString::shared_null'
/tmp/ccxDBCSi.o(.gnu.linkonce.t._._7QString+0x3d): undefined reference to `QStringData::deleteSelf(void)'
collect2: ld returned 1 exit status


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***********************

If anyone could give a good explanation on this and how to get round it I would be very thankful.

Deckard
04-20-2002, 09:51 AM
Hi Barrie,

Fortunately this is not a major setback. You've simply forgotten to include the Qt library in your g++ command line. Try adding '-l qt' as the last argument for g++ and let me know how it goes.