Segfault when adding QwtPlot to the code - c++

Question

I try to use QwtPlot, but when i add this line to my MainWindow.cpp
QwtPlot *plot = new QwtPlot(QwtText("Demo"), this);
the application compile and link without errors, but when I try to run it I get
Program received signal SIGSEGV, Segmentation fault.
0x00007ffff514227c in ?? () from /usr/lib/libQtGui.so.4
without any backtrace. My .pro file:
INCLUDEPATH += /usr/include/qwt
CONFIG += qwt
LIBS += -lqwt
I'm using Qwt 6.0.2, Qt Creator 2.7.0 and have Qt 4.8.4 and 5.0.2 installed.
The error also occours when I create a "Qt Gui Application" (without .ui file) and just this code:
qwt-test.pro
QT += core gui
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
TARGET = qwt-test
TEMPLATE = app
INCLUDEPATH += /usr/include/qwt
CONFIG += qwt
LIBS += -lqwt
SOURCES += main.cpp\
MainWindow.cpp
HEADERS += MainWindow.hpp
main.cpp
#include "MainWindow.hpp"
#include <QApplication>
#include <QDebug>
int main(int argc, char *argv[])
{
qDebug() << "main";
QApplication a(argc, argv);
MainWindow w;
w.show();
return a.exec();
}
MainWindow.hpp
#ifndef MAINWINDOW_HPP
#define MAINWINDOW_HPP
#include <QMainWindow>
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
MainWindow(QWidget *parent = 0);
~MainWindow();
};
#endif // MAINWINDOW_HPP
MainWindow.cpp
// MainWindow.cpp
#include "MainWindow.hpp"
#include <qwt_plot.h>
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
{
QwtPlot *plot = new QwtPlot(QwtText("Demo"), this);
}
MainWindow::~MainWindow()
{
}
Thanks!

Answer 1

It was a problem with Qt Creator (or Qwt being incompatible with Qt 5), it recognized qmake as qmake for Qt 4 but it was for Qt 5. Fixing the versions in Options -> Build&Run -> Qt Versions and using Qt 4 for the project fixed the segfault.