[CMake] FindCUDA Separable Compilation and cublas_device

[Jamil Appa]

Hi Robert

  I am using CUDA_ADD_CUBLAS_TO_TARGET but the error happens during the
prelink phase when using separable compilation. (nvcc -dlink phase)

   My guess is that Nvidia have not included cublas_device.a in their dlink
phase as you don't have to provide any other libraries. I have asked the
Nvidia team if that is the case, but no reply yet.

   The general fix seems to be to modify lines 1759/1772 of FindCUDA.cmake
(in gitlab master) to include CUBLAS_LIBRARIES

 COMMAND ${CUDA_NVCC_EXECUTABLE} ${nvcc_flags} -dlink ${object_files}
${CUDA_CUBLAS_LIBRARIES} -o ${output_file}

 This will have no impact if the cublas symbols are not used in the object
files.

  If you are happy with this I can submit the change for review.

 Jamil

On Thu, 2 Nov 2017 at 13:53 Robert Maynard <robert.maynard at kitware.com>
wrote:

> Hi,
>
> Have you tried using the 'CUDA_ADD_CUBLAS_TO_TARGET' command on the target
> that has FindCUDA separable compilation enabled?
>
> On Wed, Nov 1, 2017 at 11:16 AM, Jamil Appa <jamil.appa at zenotech.com>
> wrote:
>
>> Hi
>>
>>    When using FindCUDA with separable compilation combined with device
>> code that uses cublas_device I get missing symbols when linking the
>> intermediate file at line 1758
>> <https://gitlab.kitware.com/cmake/cmake/blob/release/Modules/FindCUDA.cmake#L1758>
>>  FindCUDA.cmake
>>
>>    If I  change line 1758 to include the cublas_device library the
>> symbols are resolved correctly.
>>
>>    COMMAND ${CUDA_NVCC_EXECUTABLE} ${nvcc_flags} -dlink ${object_files}
>> -o ${output_file} -lcublas_device
>>
>>    Is there a way to pass through a library to
>> the CUDA_LINK_SEPARABLE_COMPILATION_OBJECTS function that I am missing?
>>
>>    Thanks
>>
>>  Jamil
>>
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