[FFmpeg-devel] Unable to use sqrt() and exp() in CUDA

[Timo Rothenpieler]

On 26.06.2021 15:35, Dylan Fernando wrote:
> I can't seem to be able to use exp() and sqrt() in CUDA.
> 
> I get:
> 
> NVCC    libavfilter/try_cuda.ptx
> clang-11: warning: Unknown CUDA version. cuda.h: CUDA_VERSION=11030.
> Assuming the latest supported version 10.1 [-Wunknown-cuda-version]
> libavfilter/try_cuda.cu:39:19: error: use of undeclared identifier 'exp'
>         float g = exp(f);

Is this using enable-cuda-llvm? If so, you will need to add any new 
functions to our compat layer in compat/cuda/cuda_runtime.h.

Also, where does this cuda.h error come from? Are you including that in 
your cuda file? If so, don't. It's not license compatible with ffmpeg.

For development of filters, I usually use actual CUDA nvcc, since it 
also supports greater debugging features, and then in the end solve any 
compatibility issues with a clang build.



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