问题
Following this and this posts, I'm compiling the main.c code on this GitHub Gist.
Running CMake command find_package(OpenCL REQUIRED) I get this:
-- Looking for CL_VERSION_2_2 - found -- Found OpenCL: C:/Program Files (x86)/IntelSWTools/system_studio_2020/OpenCL/sdk/lib/x86/OpenCL.lib (found version "2.2")
indicating that an OpenCL SDK version 2.2 was found. This is in contradiction with what I get from clinfo tool, detecting a 1.2 OpenCL for Intel's SDK/platforms. Now when running the executable I get:
cl_version.h: CL_TARGET_OPENCL_VERSION is not defined. Defaulting to 220 (OpenCL 2.2)
My questions are:
- Why I get two different versions of OpenCL from CMake and
clinfo? - What is the warning I'm getting at runtime and how to fix that?
P.S. Here is the output of cmake .. --debug-find
回答1:
OpenCL version in SDK and reported by clinfo are 2 different things:
- clinfo reports OpenCL version supported by your GPU
- SDK OpenCL version is the max version supported by SDK
Now if you use in your program OpenCL 2.0 and your GPU supports OpenCL 1.2 then I would suspect one of the CL functions will report error or the program will have undefined behavior. You can set the target OpenCL version in your program using #define CL_TARGET_OPENCL_VERSION <version>, for example
#define CL_TARGET_OPENCL_VERSION 120
and then the API above target version shouldn't be available.
来源：https://stackoverflow.com/questions/62286806/getting-cl-version-h-cl-target-opencl-version-is-not-defined-defaulting-to-22