How to get the linker in gcc to recognize OpenCL library functions?

Question

I'm getting my feet wet with OpenCL. I'm sure this problem is not specific to OpenCL, however.

the top of my main file looks like:

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <OpenCL/opencl.h>

// some code

cl_device_id device_id; //declaring a device id gives no errors

int err = clGetDeviceIDs(NULL, CL_DEVICE_TYPE_GPU, 1, &device_id, NULL);
//the above API call does give an error.

I'm doing this on Snow Leopard. I can build and run Apple's examples using XCode. I can also compile and run NVIDIA's sample code by running make.

How do I properly compile my code without using XCODE?

Answer 1

$ gcc -framework OpenCL hello.c

and

$ gcc -framework opencl hello.c

both work. Anyone want to try this on a non-OSX environment?

Answer 2

I built some simple examples using Eclipse CDT. I needed to also change #include <OpenCL/opencl.h> to #include <opencl.h> outside of XCode, and add -I /System/Library/Frameworks/OpenCL.framework/Headers (or something similar).