OpenCL library/function missing

ah! I should have done that the first time. lesson learned 🙂

#include <OpenCL/opencl.h>

int main(int argc, char** argv) {

int height, width, size;

float* input;

cl_platform_id platform;

cl_device_id device;

cl_context context;

cl_command_queue queue;

cl_mem memBuffer;

size_t buff[0];

// this one fails

clEnqueueWriteBufferRect(queue, memBuffer, CL_TRUE, buff, buff, buff,

width*sizeof(float), 0, width*sizeof(float), 0, input, 0, NULL, NULL);

// this one works

//clEnqueueWriteBuffer(queue, memBuffer, CL_TRUE, 0, size, input, 0, NULL, NULL);

return 0;

}

I compile using this line:

g++ demo.cpp -framework OpenCL

and the error I get is:

Undefined symbols:

"_clEnqueueWriteBufferRect", referenced from:

_main in ccpln4aL.o

ld: symbol(s) not found

collect2: ld returned 1 exit status

but if I comment that function and instead use clEnqueueWriteBuffer() there is no error whatsoever!

why would that be?

ok, thanks, but how do I solve that? I need to use clEnqueueReadBufferRect and I cannot.

how do I go about that? I thought it's not possible to install Xcode4 on Snow.

or is there a way to update my OpenCL libraries? I'm not using Xcode anyway.

fooled you? 🙂 that was not in my intention. and I am not using any custom setup. Xcode is installed with all the developer kit, it's just I'm not using it. I rather like using g++ from a command line.

Isn't any way I could import the OpenCL 1.1 libraries (found the headers, but not the libraries) from Lion or some other place on the web and just use those instead?

How did you even know that new function was there? On my Snow Leopard machine it doesn't even exist. This is a system library on Lion. If you are targeting Lion, you need to use Lion and Xcode4 to build.

I knew because there are several locations where cl.h can be found in Spotlight. one location was Nvidia's GPU computing SDK. while looking inside that one I noticed this function and I hate I cannot use it because it optimizes the previous function from 1.0 which is slower in execution. I just installed Xcode 4.2 but that didn't update the libraries in /System/Library/Frameworks/OpenCL.framework/Libraries so I'm kind of at a loss here 😟

when I installed Xcode 4.2 it touched the frameworks location because it's date and time are changed to today, but no headers/libraries were touched whatsoever. well, unless someone can zip the OpenCL.framework in Lion and ship it to me, I'm gonna drop this path with much regret 😟