libGLViewer Error

[fruzti]

Im new at Qt and I'm struggling with libGLViewer. Here is my issue: when finished the first sample program of libGLViewer I got this error, and I really dont know what to do to fix it. I'm looking forward for an answer.

Error:


Makefile.Debug:132: warning: overriding commands for target `debug/main.o'


Makefile.Debug:126: warning: ignoring old commands for target `debug/main.o'

Here is the code too:

simplerviewer.h


#ifndef SIMPLEVIEWER_H
#define SIMPLEVIEWER_H

#include <QGLViewer/qglviewer.h>

class Viewer : public QGLViewer
{
protected :
virtual void draw();
virtual void init();
virtual QString helpString() const;
};

#endif // SIMPLEVIEWER_H

simplerviewer.cpp


#include "simpleViewer.h"

using namespace std;

// Draws a spiral
void Viewer::draw()
{
const float nbSteps = 200.0;

glBegin(GL_QUAD_STRIP);
for (int i=0; i<nbSteps; ++i)
{
const float ratio = i/nbSteps;
const float angle = 21.0*ratio;
const float c = cos(angle);
const float s = sin(angle);
const float r1 = 1.0 - 0.8f*ratio;
const float r2 = 0.8f - 0.8f*ratio;
const float alt = ratio - 0.5f;
const float nor = 0.5f;
const float up = sqrt(1.0-nor*nor);
glColor3f(1.0-ratio, 0.2f , ratio);
glNormal3f(nor*c, up, nor*s);
glVertex3f(r1*c, alt, r1*s);
glVertex3f(r2*c, alt+0.05f, r2*s);
}
glEnd();
}

main.cpp

void Viewer::init()
{
// Restore previous viewer state.
restoreStateFromFile();

// Opens help window
help();
}

QString Viewer::helpString() const
{
QString text("<h2>S i m p l e V i e w e r</h2>");
text += "Use the mouse to move the camera around the object. ";
text += "You can respectively revolve around, zoom and translate with the three mouse buttons. ";
text += "Left and middle buttons pressed together rotate around the camera view direction axis<br><br>";
text += "Pressing <b>Alt</b> and one of the function keys (<b>F1</b>..<b>F12</b>) defines a camera keyFrame. ";
text += "Simply press the function key again to restore it. Several keyFrames define a ";
text += "camera path. Paths are saved when you quit the application and restored at next start.<br><br>";
text += "Press <b>F</b> to display the frame rate, <b>A</b> for the world axis, ";
text += "<b>Alt+Return</b> for full screen mode and <b>Control+S</b> to save a snapshot. ";
text += "See the <b>Keyboard</b> tab in this window for a complete shortcut list.<br><br>";
text += "Double clicks automates single click actions: A left button double click aligns the closer axis with the camera (if close enough). ";
text += "A middle button double click fits the zoom of the camera and the right button re-centers the scene.<br><br>";
text += "A left button double click while holding right button pressed defines the camera <i>Revolve Around Point</i>. ";
text += "See the <b>Mouse</b> tab and the documentation web pages for details.<br><br>";
text += "Press <b>Escape</b> to exit the viewer.";
return text;
}



#include "simpleViewer.h"
#include <qapplication.h>

int main(int argc, char** argv)
{
// Read command lines arguments.
QApplication application(argc,argv);

// Instantiate the viewer.
Viewer viewer;

#if QT_VERSION < 0x040000
// Set the viewer as the application main widget.
application.setMainWidget(&viewer);
#else
viewer.setWindowTitle("simpleViewer");
#endif

// Make the viewer window visible on screen.
viewer.show();

// Run main loop.
return application.exec();
}


Please, it would be nice some answers. Thnx!