I don't know if this is a bug in Qt or not. I re-emerged qt-3.3.3 last
night to have it install the documentation. Now the HTML docs are
installed. I've been giving my wife C++ lessons in our spare time, and
I thought she might enjoy doing some GUI stuff. I've always used Qt for
my C++ GUI projects, though I haven't worked on any since I came to
Gentoo. I typed in this program straight out of my Qt 3 book:
#include <qapplication.h>
#include <qlabel.h>
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
QLabel *label = new QLabel("Hello World!", 0);
app.setMainWidget(label);
label->show();
return app.exec();
}
I ran qmake -project to get a .pro file, then qmake again to generate a
Makefile. Then I ran make and got this output:
g++ -c -pipe -Wall -W -O2 -march=i686 -DQT_NO_DEBUG
-I/usr/qt/3/mkspecs/linux-g++ -I. -I. -I/usr/qt/3/include -o helloqt.o
helloqt.cpp
g++ -o qt helloqt.o -L/usr/X11R6/lib -lXext -lX11 -lm
helloqt.o(.text+0x2a): In function `main':
: undefined reference to `QApplication::QApplication[in-charge](int&,
char**)'
helloqt.o(.text+0x50): In function `main':
: undefined reference to `QString::QString[in-charge](char const*)'
helloqt.o(.text+0x6e): In function `main':
: undefined reference to `QLabel::QLabel[in-charge](QString const&,
QWidget*, char const*, unsigned)'
helloqt.o(.text+0x84): In function `main':
: undefined reference to `QString::shared_null'
helloqt.o(.text+0x8e): In function `main':
: undefined reference to `QStringData::deleteSelf()'
helloqt.o(.text+0x9a): In function `main':
: undefined reference to `QApplication::setMainWidget(QWidget*)'
helloqt.o(.text+0xad): In function `main':
: undefined reference to `QApplication::exec()'
helloqt.o(.text+0xb7): In function `main':
: undefined reference to `QApplication::~QApplication [in-charge]()'
helloqt.o(.text+0xe0): In function `main':
: undefined reference to `QString::shared_null'
helloqt.o(.text+0xea): In function `main':
: undefined reference to `QStringData::deleteSelf()'
helloqt.o(.text+0x104): In function `main':
: undefined reference to `QApplication::~QApplication [in-charge]()'
helloqt.o(.gnu.linkonce.r._ZTV6QGList+0xc): undefined reference to
`QGList::clear()'
helloqt.o(.gnu.linkonce.r._ZTV6QGList+0x10): undefined reference to
`QGList::~QGList [in-charge]()'
helloqt.o(.gnu.linkonce.r._ZTV6QGList+0x14): undefined reference to
`QGList::~QGList [in-charge deleting]()'
helloqt.o(.gnu.linkonce.r._ZTV6QGList+0x18): undefined reference to
`QPtrCollection::newItem(void*)'
helloqt.o(.gnu.linkonce.r._ZTV6QGList+0x20): undefined reference to
`QGList::compareItems(void*, void*)'
helloqt.o(.gnu.linkonce.r._ZTV6QGList+0x24): undefined reference to
`QGList::read(QDataStream&, void*&)'
helloqt.o(.gnu.linkonce.r._ZTV6QGList+0x28): undefined reference to
`QGList::write(QDataStream&, void*) const'
helloqt.o(.gnu.linkonce.r._ZTI6QGList+0x8): undefined reference to
`typeinfo for QPtrCollection'
collect2: ld returned 1 exit status
make: *** [qt] Error 1
I looked over my book's source code and compared it to what I typed in
and they look identical. Is this a problem with my source code or a
problem with the Qt toolkit? Should I submit this as a bug?
--
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