Requested OpenCL version: 1.2, Found OpenCL version 0.0 about clblas HOT 4 CLOSED

src/FindOpenCL.cmake CMake script is used to find OpenCL. It looks for the cl.h header and greps it for CL_VERSION_1_1, CL_VERSION_1_2, CL_VERSION_2_0. This points him to OpenCL version supportred by header. On my system I have the following code in cl.h for example:

 195 #define CL_VERSION_1_0                              1
 196 #define CL_VERSION_1_1                              1
 197 #define CL_VERSION_1_2                              1
 198 #define CL_VERSION_2_0                              1

You can try to set set( OpenCL_VERSION "0.0" ) line to set( OpenCL_VERSION "1.2" ) if you are sure. Or better check what particular cl.h header is found and what CL_VERSION_X_X are defined in it.

from clblas.

Thanks for the response. I do have cl.h header on my system. How does it know where to look for cl.h, is it guided by some environment variable? I wonder if I just need to configure or fix some environment variable and then it will work.

By the way, what OpenCL package/distribution do you test against?

Thanks!

don@donfpga2:~$ cat /opt/intel/opencl-1.2-6.4.0.25/SDK/include/CL/cl.h|grep CL_VERSION
#define CL_VERSION_1_0 1
#define CL_VERSION_1_1 1
#define CL_VERSION_1_2 1

from clblas.

You can check OPENCL_INCLUDE_DIRS variable in your CMakeCache.txt. If it is not /opt/intel/opencl-1.2-6.4.0.25/SDK/include you can try pointing clBLAS to it by using OPENCL_ROOT CMake variable like this:

cmake ../src/ -DOPENCL_ROOT=/opt/intel/opencl-1.2-6.4.0.25/SDK

And yes, it also checks environment variables OPENCL_ROOT, AMDAPPSDKROOT and CUDA_PATH.
Newer versions of FindOpenCL.cmake script found in CMake distribution look at INTELOCLSDKROOT variable too but it doesn't matter really since every vendor supports ICD in their implementation. Headers are almost the same in all SDK's and there is no difference what libOpenCL.so to link with. I personally use headers from opencl-headers package which are in /usr/include/CL.

from clblas.

Thanks! Settings the OPENCL_ROOT environment variable (and cleaning up the files in the build directory from my previous failed attempts) allowed the build to complete.

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