Nothing works !

**wysota** · 24th June 2013, 20:42

Yes, you should replace it with the path to your Qwt installation.

**Amoliane** · 24th June 2013, 23:47

I did it, as I said, and the problem remains. I haven't found if I had to change it somewhere else.

One day, this will work !

**ChrisW67** · 25th June 2013, 00:08

To confirm.
You have Qwt 6.1 built with Qt5 and installed under /usr/local.

So this is what you get:

Qt Code:

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chrisw@newton ~ $ qmake -query QMAKEFEATURES
/usr/local/qwt-6.1.0/features

chrisw@newton ~ $ qmake -query QMAKEFEATURES
/usr/local/qwt-6.1.0/features

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and you have a pro file like:

Qt Code:

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QT       += core gui
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
 
TARGET = test
TEMPLATE = app
SOURCES += main.cpp\
        mainwindow.cpp
HEADERS  += mainwindow.h
FORMS    += mainwindow.ui
CONFIG += qwt

QT       += core gui
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = test
TEMPLATE = app
SOURCES += main.cpp\
        mainwindow.cpp
HEADERS  += mainwindow.h
FORMS    += mainwindow.ui
CONFIG += qwt

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and a basic program like the one you posted earlier. Your code compiles without warning or error, but "doesn't work" when started..

If so, exactly what does "doesn't work" mean?

**Amoliane** · 25th June 2013, 09:07

I don't have TARGET nor TEMPLATE in my .pro but appart from that you are right.

In my code, I only create a qwt object.
When I start the program, I have "realloc(): invalid pointer" followed by the backtrace and the memory map.

**wysota** · 25th June 2013, 10:42

Can you show us your exact code?

**Amoliane** · 25th June 2013, 11:11

I just figured out that I had let the lines

Qt Code:

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unix|win32: LIBS += -L$$PWD/../../../../../usr/local/qwt-6.1.0/lib/ -lqwt
 
#INCLUDEPATH += $$PWD/../../../../../usr/local/qwt-6.1.0/include
#DEPENDPATH += $$PWD/../../../../../usr/local/qwt-6.1.0/include

unix|win32: LIBS += -L$$PWD/../../../../../usr/local/qwt-6.1.0/lib/ -lqwt

#INCLUDEPATH += $$PWD/../../../../../usr/local/qwt-6.1.0/include
#DEPENDPATH += $$PWD/../../../../../usr/local/qwt-6.1.0/include

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in the .pro while I thought I had suppressed them when wysota told me to.
Actually, the code only compiled because of them. New project, new try, new errors ; there I have (the most simple I can) :

Qt Code:

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QT       += core gui
 
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
 
TARGET = qwt_test
TEMPLATE = app
 
CONFIG += qwt # hand added
 
 
SOURCES += main.cpp

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = qwt_test
TEMPLATE = app

CONFIG += qwt # hand added


SOURCES += main.cpp

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for the .pro

Qt Code:

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#include <QApplication>
 
#include<qwt_compass.h>
 
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    //MainWindow w;
    //w.show();
    QwtCompass compass;
    compass.show();
 
    return a.exec();
}

#include <QApplication>

#include<qwt_compass.h>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    //MainWindow w;
    //w.show();
    QwtCompass compass;
    compass.show();

    return a.exec();
}

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for main.cpp

That code does not compile. It returns :

Qt Code:

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In function `MainWindow::on_actionTest_triggered()':
error: undefined reference to `QwtCompass::QwtCompass(QWidget*)'
error: undefined reference to `QwtCompass::~QwtCompass()'
error: collect2: ld returned 1 exit status

In function `MainWindow::on_actionTest_triggered()':
error: undefined reference to `QwtCompass::QwtCompass(QWidget*)'
error: undefined reference to `QwtCompass::~QwtCompass()'
error: collect2: ld returned 1 exit status

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I had all reinstalled following the steps online, no more no less.
(First installation I had copied the .so but I was told I should not have.)

**wysota** · 25th June 2013, 11:32

What is the output of qmake -query QMAKEFEATURES?

**Amoliane** · 25th June 2013, 11:51

It is still "/usr/local/qwt-6.1.0/features/" since I have changed it with "qmake -set QMAKEFEATURES" and the right path. :-)

**wysota** · 25th June 2013, 12:56

1. Make sure this is the right qmake that you are using
2. Make sure the directory contains the qwt.prf file
3. Make sure the qwt.prf file contains a reference to the qwt library
4. Show us the last compiler invocation for your project.

**Amoliane** · 25th June 2013, 13:37

1. Make sure this is the right qmake that you are using

I compile with QtCreator ; Qt Version is autodetected with location of qmake the same as what I used to compile qwt. So this is OK I think.

2. Make sure the directory contains the qwt.prf file

Which directory ? :s
If it is qwt_root/features, yes it contains qwt.prf

3. Make sure the qwt.prf file contains a reference to the qwt library

it contains :

Qt Code:

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include ( ./qwtconfig.pri )
include ( ./qwtfunctions.pri )
 
contains(QWT_CONFIG, QwtDll) {
 
    DEFINES *= QWT_DLL
}
 
contains(QWT_CONFIG, QwtSvg) {
 
	QT      *= svg
}
else {
 
	DEFINES *= QWT_NO_SVG
}
 
contains(QWT_CONFIG, QwtFramework) {
 
    INCLUDEPATH *= $${QWT_INSTALL_LIBS}/qwt.framework/Headers
    LIBS        *= -F$${QWT_INSTALL_LIBS}
}
else {
 
    INCLUDEPATH *= $${QWT_INSTALL_HEADERS}
    LIBS        *= -L$${QWT_INSTALL_LIBS}
}   
 
qwtAddLibrary(qwt)

include ( ./qwtconfig.pri )
include ( ./qwtfunctions.pri )

contains(QWT_CONFIG, QwtDll) {

    DEFINES *= QWT_DLL
}

contains(QWT_CONFIG, QwtSvg) {

	QT      *= svg
}
else {

	DEFINES *= QWT_NO_SVG
}

contains(QWT_CONFIG, QwtFramework) {

    INCLUDEPATH *= $${QWT_INSTALL_LIBS}/qwt.framework/Headers
    LIBS        *= -F$${QWT_INSTALL_LIBS}
}
else {

    INCLUDEPATH *= $${QWT_INSTALL_HEADERS}
    LIBS        *= -L$${QWT_INSTALL_LIBS}
}   

qwtAddLibrary(qwt)

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4. Show us the last compiler invocation for your project.

I compile in QtCreator. What should I show you ?

**wysota** · 25th June 2013, 13:39

Originally Posted by Amoliane

I compile with QtCreator ; Qt Version is autodetected with location of qmake the same as what I used to compile qwt. So this is OK I think.

Don't think, please. Check.

Which directory ? :s

The one returned by qmake -query QMAKEFEATURES

I compile in QtCreator. What should I show you ?

The last compiler invocation (from the "compiler messages" pane).

**Amoliane** · 25th June 2013, 13:49

Don't think, please. Check.

I tell you what I can ! QtCreator tells me it uses qmake from the same path I have used to make qwt ; I believe that is what you ask. But as long as I am not sure, I tell you that I think it is OK. No need to be aggressive. Just tell me if this is your meaning of "the right qmake" or not !

The one returned by qmake -query QMAKEFEATURES

So yes as I said.

The last compiler invocation (from the "compiler messages" pane).

Qt Code:

Switch view

14:48:37: Configuration unchanged, skipping qmake step.
14:48:37: Starting: "/usr/bin/make" 
g++ -m64 -Wl,-rpath,/home/developpeur/Qt5.0.2/5.0.2/gcc_64 -Wl,-rpath,/home/developpeur/Qt5.0.2/5.0.2/gcc_64/lib -o qwt_test main.o   -L/usr/X11R6/lib64 -L/home/developpeur/Qt5.0.2/5.0.2/gcc_64/lib -lQt5Widgets -lQt5Gui -lQt5Core -lGL -lpthread 
main.o: In function `main':
/home/developpeur/developpement/stageCamille/build-qwt_test-Desktop_Qt_5_0_2_GCC_64bit-Debug/../qwt_test/main.cpp:9: undefined reference to `QwtCompass::QwtCompass(QWidget*)'
/home/developpeur/developpement/stageCamille/build-qwt_test-Desktop_Qt_5_0_2_GCC_64bit-Debug/../qwt_test/main.cpp:12: undefined reference to `QwtCompass::~QwtCompass()'
/home/developpeur/developpement/stageCamille/build-qwt_test-Desktop_Qt_5_0_2_GCC_64bit-Debug/../qwt_test/main.cpp:12: undefined reference to `QwtCompass::~QwtCompass()'
collect2: ld returned 1 exit status
make: *** [qwt_test] Error 1
14:48:37: The process "/usr/bin/make" exited with code 2.
Error while building/deploying project qwt_test (kit: Desktop Qt 5.0.2 GCC 64bit)
When executing step 'Make'
14:48:38: Elapsed time: 00:00.

14:48:37: Configuration unchanged, skipping qmake step.
14:48:37: Starting: "/usr/bin/make" 
g++ -m64 -Wl,-rpath,/home/developpeur/Qt5.0.2/5.0.2/gcc_64 -Wl,-rpath,/home/developpeur/Qt5.0.2/5.0.2/gcc_64/lib -o qwt_test main.o   -L/usr/X11R6/lib64 -L/home/developpeur/Qt5.0.2/5.0.2/gcc_64/lib -lQt5Widgets -lQt5Gui -lQt5Core -lGL -lpthread 
main.o: In function `main':
/home/developpeur/developpement/stageCamille/build-qwt_test-Desktop_Qt_5_0_2_GCC_64bit-Debug/../qwt_test/main.cpp:9: undefined reference to `QwtCompass::QwtCompass(QWidget*)'
/home/developpeur/developpement/stageCamille/build-qwt_test-Desktop_Qt_5_0_2_GCC_64bit-Debug/../qwt_test/main.cpp:12: undefined reference to `QwtCompass::~QwtCompass()'
/home/developpeur/developpement/stageCamille/build-qwt_test-Desktop_Qt_5_0_2_GCC_64bit-Debug/../qwt_test/main.cpp:12: undefined reference to `QwtCompass::~QwtCompass()'
collect2: ld returned 1 exit status
make: *** [qwt_test] Error 1
14:48:37: The process "/usr/bin/make" exited with code 2.
Error while building/deploying project qwt_test (kit: Desktop Qt 5.0.2 GCC 64bit)
When executing step 'Make'
14:48:38: Elapsed time: 00:00.

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