The following call fails with CL_INVALID_DEVICE:
cl_kernel kernel = <create kernel somehow>
size_t size;
clGetKernelWorkGroupInfo(kernel,
0, // if device is specified, everything is fine
CL_KERNEL_WORK_GROUP_SIZE,
sizeof(size_t),
&size,
0);
Even though associated program is build only for one device. Specifying device solves the probleb. Hope that helps.
