[GitHub] vipandrew commented on issue #10745: Build from sources with Cuda 9.0 cudnn 7.1 on Window 10.

[GitBox <gi...@apache.org>]

vipandrew commented on issue #10745: Build from sources with Cuda 9.0 cudnn 7.1 on Window 10.
URL: https://github.com/apache/incubator-mxnet/issues/10745#issuecomment-398724459
 
 
   Cuda.cmake is used to detect GPU compute capability by calling nvcc command like "**${CUDA_NVCC_EXECUTABLE} --run  ${__cufile}**" , then regular expression is caled in cmake to extract cuda compute capability string: string(REGEX MATCH "(**[1-9].[0-9]**)" __nvcc_out "${__nvcc_out}")
   
   In my computer with cuda9.0, what the command output is：c:\program files\nvidia gpu computing toolkit\cuda\v**9.0**\include\crt\math_functions.h : warning C4819: .......
   **6.1**
   
   Here comes the question, __nvcc_out is set to be 9.0 rather than 6.1(which is the right one we want), since 9.0 is wrongly matched, and that's why we saw "sm_90". Now the solution is clear, add "-w" arguments after nvcc command to depress warnings:  ${CUDA_NVCC_EXECUTABLE} --run  ${__cufile} **"-w"** ..., or change the regular expression to **([^a-zA-Z][1-9]\\\\.[0-9])**.

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