Why i am in getting undefined refrence error after linking liblas to Qt?

Question

I am trying to link liblas library to Qt.I am using following code in .pro file to link it.

    //////////////code to link liblas to Qt/////////////////////////////////   
    win32:CONFIG(release, debug|release): LIBS += -L$$PWD/../../../../OSGeo4W/lib/ -lliblas
    else:win32:CONFIG(debug, debug|release): LIBS += -L$$PWD/../../../../OSGeo4W/lib/ -lliblas
    else:unix: LIBS += -L$$PWD/../../../../OSGeo4W/lib/ -lliblas

    INCLUDEPATH += $$PWD/../../../../OSGeo4W/include
    DEPENDPATH += $$PWD/../../../../OSGeo4W/include

    win32:CONFIG(release, debug|release): LIBS += -L$$PWD/../../../../OSGeo4W/lib/ -llaszip
    else:win32:CONFIG(debug, debug|release): LIBS += -L$$PWD/../../../../OSGeo4W/lib/ -llaszipd
    else:unix: LIBS += -L$$PWD/../../../../OSGeo4W/lib/ -llaszip

    INCLUDEPATH += $$PWD/../../../../OSGeo4W/include
    DEPENDPATH += $$PWD/../../../../OSGeo4W/include
 ///////////////////////////////////////////////////////////////   
    and when i am running the code given below, I am getting undefined reference error
        ifstream stream;
        stream.open("lidar_sample.las", std::ios::in | std::ios::binary);
        ReaderFactory f;
        Reader reader = f.CreateWithStream(stream);
    error: undefined reference to `liblas::ReaderFactory::CreateWithStream(std::istream&)'

score 0 · Answer 1 · answered May 08 '17 at 10:40

0

only two possible answers here.

your liblas is not found by the linker
your liblas is not the same version as your headers.

answered May 08 '17 at 10:40

Tomaz Canabrava

2,320
15
20

But I am getting all the liblas header files when i am including them in my .cpp – Neeraj Shukla May 08 '17 at 10:44
the header files are from this line: INCLUDEPATH += $$PWD/../../../../OSGeo4W/include , the library is from this line: else:unix: LIBS += -L$$PWD/../../../../OSGeo4W/lib/ -lliblas - verify that they are indeed correct. – Tomaz Canabrava May 08 '17 at 10:45
Ok,understood.But how can i check for second possibility you have mentioned. – Neeraj Shukla May 08 '17 at 10:49
if you are on linux, run the nm tool on the library to see if it indeed has the method you are calling. – Tomaz Canabrava May 08 '17 at 10:52
i am on windows – Neeraj Shukla May 08 '17 at 11:00
I have got lidar data and i want to extract x,y,z and intensity from that data.Is there some other simple way to do so.Please,if you could help. – Neeraj Shukla May 08 '17 at 11:34

Why i am in getting undefined refrence error after linking liblas to Qt?

1 Answers1