Duplicated code generation flags on CMAKE Cuda/ptx project

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I want to compile cuda to ptx for embedding. For this I am using CMAKE 3.18.5 with visual studio 16(2019) generator, which is a requirement from the project. The problem I am having is that the target flags are duplicated compute_75,compute_75;compute_75,sm_75 and because of that nvcc refuses to compile it to ptx.

2>C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Microsoft\VC\v160\BuildCustomizations\CUDA 11.2.targets(625,9): error : More than 1 Code Generation option is specified, this is only allowed if NVCC Compilation Type is 'compile' or 'fatbin'.

For a minimal working example I use a code example for how to do this from a github repo which was featured in nvidia devblog. This example works. I change the example to require CMAKE 3.18 (from 3.8) and add

set_property(TARGET CudaPTX PROPERTY CUDA_ARCHITECTURES 75)
set_property(TARGET ExportPTX PROPERTY CUDA_ARCHITECTURES off)

At line 51 (after target_include_directories) and my problem is manifested. screenshot.

  1. What am I doing wrong?
  2. How do I begin debugging something like this?
  3. How can I change my code example to compile, given I require cmake 3.18 and vs2019?
cuda cmake visual-studio
1 Answers

This is due to CMake generating architectures for both real and virtual devices, which is unfortunately incompatible with PTX generation.

Using the following forces using only the virtual architecture, and fixes the problem:

set(CMAKE_CUDA_ARCHITECTURES 75-virtual)
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