[vtkusers] CMake, UseVTK.cmake and CUDA incompatibility

[Cory Quammen]

Hi Andreas,

The best way I have found to build a project that uses CUDA and VTK is to:

- make sure the CUDA code is compiled into a separate library target
- clear out the include directories and compiler definitions prior to
specifying the CUDA library target to avoid problems with spaces in
the VTK definitions and too-long command lines
- link you application against the CUDA library and VTK

In your CMakeLists.txt file in the directory for the CUDA library, the
library target set up would look something like this:

# Reset the include directories to avoid an error from the number of
/I -I options
# making the command line for nvcc too long.
set_directory_properties( PROPERTIES INCLUDE_DIRECTORIES "" )

# The definitions (-DFOO) from VTK were confusing nvcc
set_directory_properties( PROPERTIES COMPILE_DEFINITIONS "" )
cuda_add_library( myCUDAlibrary
  ${CUDA_SRCS}
)

Hope that helps,
Cory


On Sun, Jun 26, 2016 at 11:13 AM, Andreas Hermann <squelsh at gmx.net> wrote:
> Hi everyone,
>
> I am new to the list, but I already found several postings here that
> describe the same problem. Unfortunately no satisfying answer was given yet
> (AFAIK).
>
> I am trying to compile a larger project that uses CUDA and PCL (invoking
> VTK).
> But a bunch of CMAKE Flags defined by VTK kill NVCCs parsing, as they
> include spaces.
> Result is:
>
> "nvcc fatal   : A single input file is required for a non-link phase when an
> outputfile is specified"
>
> Those flags are not required when calling NVCC but VTK defines them globally
> ):
>
> Gregory Kramida describes the problem best in his mail from Dec 2015:
> http://public.kitware.com/pipermail/vtkusers/2015-December/093367.html
>
> So my question is: How do you use CUDA together with VTK in a CMake project?
> It would be great to get any advice on how to handle this...
>
>
> Thanks,
> Andreas
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-- 
Cory Quammen
R&D Engineer
Kitware, Inc.