library is linked but reference is undefined

Question

I\'m trying to compile an openCL program on Ubuntu with an NVIDIA card that worked once before,

#include 
#include 
#include &         


        

Answer 1

when you are linking, the order of your libraries and source files makes a difference. for example for your case,

g++ -I/usr/local/cuda/include -L/usr/lib/nvidia-current -lOpenCL opencl.cpp

functions defined in the OpenCL library might not be loaded, since there nothing before them asking for a look-up. however if you use,

g++ opencl.cpp -I/usr/local/cuda/include -L/usr/lib/nvidia-current -lOpenCL  

then any requests for functions will be found in the OpenCL library and they will be loaded.