gistfile1.txt

My app links in a 3rd party library (QCAR)

In the top of my .cpp file I have:
    #include <QCAR/TrackerManager.h>


In one of the methods of my class, i'm making the following call (which fails to link)
    QCAR::TrackerManager& trackerManager = QCAR::TrackerManager::getInstance();

it fails with the following error:
    ... /FrameMarkers.cpp:579: undefined reference to `QCAR::TrackerManager::getInstance()'



Below is the (abbreviated) definition of TrackerManager

#ifndef _QCAR_TRACKER_MANAGER_H_
#define _QCAR_TRACKER_MANAGER_H_

// Include files
#include <QCAR/Tracker.h>

namespace QCAR
{

/// TrackerManager class.
class QCAR_API TrackerManager
{
public:
    static TrackerManager& getInstance();

    virtual Tracker* initTracker(Tracker::TYPE type) = 0;
    virtual Tracker* getTracker(Tracker::TYPE type) = 0;
    virtual bool deinitTracker(Tracker::TYPE type) = 0;
};

} // namespace QCAR

#endif //_QCAR_TRACKER_MANAGER_H_



In looking at the samples in the SDK they call the exact same method, and it links without any problem...



*EDIT:* Here's the method with the line that fails, for some more context:
JNIEXPORT void JNICALL
Java_com_qualcomm_QCARSamples_FrameMarkers_FrameMarkers_startCamera(JNIEnv *,
                                                                         jobject)
{
    LOG("Java_com_qualcomm_QCARSamples_FrameMarkers_FrameMarkers_startCamera");

    // Initialize the camera:
    if (!QCAR::CameraDevice::getInstance().init())
        return;

    // Configure the video background
    configureVideoBackground();

    // Select the default mode:
    if (!QCAR::CameraDevice::getInstance().selectVideoMode(
                                QCAR::CameraDevice::MODE_DEFAULT))
        return;

    // Start the camera:
    if (!QCAR::CameraDevice::getInstance().start())
        return;

    // Start the tracker:
    QCAR::TrackerManager& trackerManager = QCAR::TrackerManager::getInstance();
    QCAR::Tracker* markerTracker = trackerManager.getTracker(QCAR::Tracker::MARKER_TRACKER);
    if(markerTracker != 0)
        markerTracker->start();
    
    
    // Cache the projection matrix:
    const QCAR::CameraCalibration& cameraCalibration =
                                QCAR::CameraDevice::getInstance().getCameraCalibration();
    projectionMatrix = QCAR::Tool::getProjectionGL(cameraCalibration, 2.0f,
                                            2000.0f);
}




QCAR_API is defined as:
#  ifdef QCAR_EXPORTS
#    define QCAR_API __attribute__((visibility("default"))) 
#  elif defined(QCAR_STATIC)
#    define QCAR_API
#  else
#    define QCAR_API __attribute__((visibility("default")))
#  endif

(note that this means nothing to me)