#5 Linker problems on ubuntu 12.04 and fix

[Alun]

Hi,

I've encountered a couple of problems trying to build insight3dng on Ubuntu 12.04.

Firstly, running make stopped with the following errors at the final link step:

/usr/bin/ld: /usr/lib/gcc/i686-linux-gnu/4.6/../../../i386-linux-gnu/libgtk-x11-2.0.so: undefined reference to symbol 'gdk_screen_get_width'
/usr/bin/ld: note: 'gdk_screen_get_width' is defined in DSO /usr/lib/gcc/i686-linux-gnu/4.6/../../../i386-linux-gnu/libgdk-x11-2.0.so so try adding it to the linker command line
/usr/lib/gcc/i686-linux-gnu/4.6/../../../i386-linux-gnu/libgdk-x11-2.0.so: could not read symbols: Invalid operation

From googling this, it seems that there's been a change to ld, and the fix is to explicitly link with all the libraries needed.

So, I've added -lgdk-x11-2.0

I then get a slew of undefined symbol errors from the sba library:

./sba/libsba.a(sba_lapack.o): In function `sba_Axb_QR':
sba_lapack.c:(.text+0x248): undefined reference to `dgeqrf_'
sba_lapack.c:(.text+0x36f): undefined reference to `dorgqr_'
....
....

However, sba does come with its own demo program, which DOES link. The sba demo makefile seems
to include its libraries in a different order. Tweaking the insight3dng Makefile to use this seems to fix it.

So, my working link line is:

g++ $(DEBUG) -o insight3d *.o `pkg-config --libs opencv libxml-2.0 sdl gtk+-2.0` ./sift/lib/libfeat.a $(AGARLIB) ./sba/libsba.a -llapack -lblas -lGL -lGLU -lgdk-x11-2.0 ./ann_1.1.1/lib/libANN.a

It might be worth fixing the Makefile.

Thanks,
Alun.

[Afan Ottenheimer]

Had similar problems on Ubuntu 13.10. Had to compile at end adding -lpthread

g++ -O3 -o insight3d *.o `pkg-config --libs opencv libxml-2.0 sdl gtk+-2.0` ./sift/lib/libfeat.a  ./sba/libsba.a -llapack -lblas -lGL -lGLU -lgdk-x11-2.0 -lpthread ./ann_1.1.1/lib/libANN.a