Date: Thu, 12 Oct 2000 17:55:42 -0700 (PDT) From: Christian Lacunza <celacunza@yahoo.com> To: beemern@telecom.ksu.edu Cc: freebsd-questions@freebsd.org Subject: Re: c++/qt lib compile error Message-ID: <20001013005542.27163.qmail@web6305.mail.yahoo.com>
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hi nathan.
your error messages are coming from the linker.
you need to tell it where too look for the Qt libraries.
on by system, your code works fine like this:
$ g++ qt.cc -I /usr/X11R6/include/qt2 -L /usr/X11R6/lib -lqt2
$ ./a.out
because my Qt libraries are here:
$ locate libqt
/usr/X11R6/lib/libqt2.so
/usr/X11R6/lib/libqt2.so.3
$
if yours are elsewhere, just change the argument to the -L switch.
-- christian.
> I know this isn't fbsd specific but...
>
> i'm tryin to follow a qt tutorial to get started with the qt libraries.
> when tryin to compile 'hello world' :
> --snip--
> #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();
> }
> --snip--
>
> i get this:
>
> --snip--
> [nathan@sabre src]$ g++ -I/usr/local/qt/include hello_qt.cc
> /tmp/ccJ85228.o: In function `main':
> /tmp/ccJ85228.o(.text+0x28): undefined reference to
> `QApplication::QApplication(int &, char **)'
> /tmp/ccJ85228.o(.text+0x3f): undefined reference to
> `QApplication::~QApplication(void)'
> /tmp/ccJ85228.o(.text+0x5e): undefined reference to
> `QString::QString(char const *)'
> /tmp/ccJ85228.o(.text+0xa8): undefined reference to
> `QPushButton::QPushButton(QString const &, QWidget *, char const *)'
> /tmp/ccJ85228.o(.text+0xe7): undefined reference to
> `QPushButton::~QPushButton(void)'
> /tmp/ccJ85228.o(.text+0x10e): undefined reference to
> `QPushButton::resize(int, int)'
> /tmp/ccJ85228.o(.text+0x124): undefined reference to
> `QApplication::setMainWidget(QWidget *)'
> /tmp/ccJ85228.o(.text+0x136): undefined reference to
> `QWidget::show(void)'
> /tmp/ccJ85228.o(.text+0x145): undefined reference to
> `QApplication::exec(void)'
> /tmp/ccJ85228.o(.text+0x169): undefined reference to
> `QPushButton::~QPushButton(void)'
> /tmp/ccJ85228.o(.text+0x188): undefined reference to
> `QApplication::~QApplication(void)'
> /tmp/ccJ85228.o: In function `QString::~QString(void)':
> /tmp/ccJ85228.o(.gnu.linkonce.t._$_7QString+0x29): undefined reference
> to `QStringData::deleteSelf(void)'
> [nathan@sabre src]$
> --snip--
>
> i've looked in my -I arg dir and it DOES contain the .h files in the
> source.
>
> what gives?
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