[GitHub] [incubator-mxnet] cepera-ang edited a comment on issue #17761: cmake stuck in infinite loop at configuration if nvcc is not found

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cepera-ang edited a comment on issue #17761: cmake stuck in infinite loop at configuration if nvcc is not found
URL: https://github.com/apache/incubator-mxnet/issues/17761#issuecomment-594840371
 
 
   I have nvcc in my $PATH as follows: 
   ```
   ➜  build git:(master) echo $PATH
   /home/cepera/miniconda3/condabin:/home/cepera/bin:/home/cepera/.nvm/versions/node/v12.3.1/bin:
   /home/cepera/.local/bin:/home/cepera/bin:/usr/local/sbin:/usr/local/bin:
   /usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:
   /home/cepera/.fzf/bin:/usr/local/cuda-10.1/bin
   ➜  build git:(master) which nvcc            
   /usr/local/bin/nvcc
   ```
   Also, if I set CUDACXX as you suggested it seems like Cmake ignores it and still guesses different path and, unfortunately, still loops:
   
   ```
   ➜  build git:(master) CUDACXX=/usr/local/bin/nvcc cmake -GNinja ..
   -- The C compiler identification is GNU 8.3.0
   -- The CXX compiler identification is GNU 8.3.0
   -- Check for working C compiler: /usr/local/bin/cc
   -- Check for working C compiler: /usr/local/bin/cc -- works
   -- Detecting C compiler ABI info
   -- Detecting C compiler ABI info - done
   -- Detecting C compile features
   -- Detecting C compile features - done
   -- Check for working CXX compiler: /usr/local/bin/c++
   -- Check for working CXX compiler: /usr/local/bin/c++ -- works
   -- Detecting CXX compiler ABI info
   -- Detecting CXX compiler ABI info - done
   -- Detecting CXX compile features
   -- Detecting CXX compile features - done
   -- CMAKE_CROSSCOMPILING FALSE
   -- CMAKE_HOST_SYSTEM_PROCESSOR x86_64
   -- CMAKE_SYSTEM_PROCESSOR x86_64
   -- CMAKE_SYSTEM_NAME Linux
   -- CMake version '3.13.4' using generator 'Ninja'
   -- Looking for a CUDA compiler
   -- Looking for a CUDA compiler - /usr/local/bin/nvcc
   CMake Warning at CMakeLists.txt:95 (message):
     CMAKE_CUDA_COMPILER guessed: /usr/local/cuda/bin/nvcc
   
   
   -- The CUDA compiler identification is NVIDIA 10.1.243
   -- Check for working CUDA compiler: /usr/local/cuda/bin/nvcc
   -- Check for working CUDA compiler: /usr/local/cuda/bin/nvcc -- works
   
   <truncated>
   ```
   
   Update: if I set CUDACXX=/usr/local/cuda/bin/nvcc (exactly as Cmake "guesses") then it configures successfully. 

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