moments.cu(19): error: identifier "__shfl_xor_sync" is undefined

[asmorkalov]

Build issue

/build/precommit_custom_linux/4.x/opencv_contrib/modules/cudaimgproc/src/cuda/moments.cu(19): error: identifier "__shfl_xor_sync" is undefined
          detected during:
            instantiation of "T cv::cuda::device::imgproc::butterflyWarpReduction(T) [with T=float]" 
(101): here
            instantiation of "void cv::cuda::device::imgproc::spatialMoments<TSrc,TMoments,coalesced,fourByteAligned,nMoments>(cv::cuda::PtrStepSz<TSrc>, __nv_bool, TMoments *, int) [with TSrc=uchar, TMoments=float, coalesced=true, fourByteAligned=false, nMoments=3]" 
(145): here
            instantiation of "void cv::cuda::device::imgproc::momentsDispatcherChar<TSrc, nMoments>::call(cv::cuda::PtrStepSz<TSrc>, cv::cuda::PtrStepSz<float>, __nv_bool, int, cudaStream_t) [with TSrc=uchar, nMoments=3]" 
(161): here
            instantiation of "void cv::cuda::device::imgproc::moments<TSrc,TMoments>(cv::cuda::PtrStepSzb, cv::cuda::PtrStepSzb, __nv_bool, int, int, cudaStream_t) [with TSrc=uchar, TMoments=float]" 
(168): here

CI link: https://pullrequest.opencv.org/buildbot/builders/precommit_custom_linux/builds/100406/steps/compile%20release/logs/stdio

System information (version)

• OpenCV => 4.x
• Operating System / Platform => Linux
• Compiler => CUDA 8.0

[cudawarped]

@asmorkalov I can include version checks but that API was introduced in CUDA 9.0 in Sept 2017 (> 6 years ago) previously I was told that version checks were only necessary if an api was under 5 years old. For future reference (I'm thinking of the current NPP synchronization which will be depreciated in the next version of CUDA and replaced with the new Application Managed Stream Context API introduced in Feb 2019 in CUDA 10.1) how new does an api have to be for version checks to be applicable?

[asmorkalov]

Good question. We need to align with jetson boards first. CUDA is frozen there and cannot be easily updated. Let me finish with release activities and I'll return back.