Fix compilation of CUDA/GPU modules

[kunaltyagi]

Lack of CI. My apologies

[taketwo]

Hmm, I still get:

In file included from ../gpu/kinfu/tools/evaluation.cpp:37:0:
../gpu/kinfu/tools/evaluation.h:53:15: error: ‘shared_ptr’ does not name a type; did you mean ‘char16_t’?
   using Ptr = shared_ptr<Evaluation>;
               ^~~~~~~~~~
               char16_t

and a bunch of others in gpu module.

And more surprisingly:

[1/21] Building NVCC (Device) object cuda/segmentation/CMakeFiles/pcl_cuda_segmentation.dir/src/pcl_cuda_segmentation_generated_connected_components.cu.o
FAILED: cuda/segmentation/CMakeFiles/pcl_cuda_segmentation.dir/src/pcl_cuda_segmentation_generated_connected_components.cu.o
cd /home/sergey/Workspace/Libraries/pcl/build-1-10/cuda/segmentation/CMakeFiles/pcl_cuda_segmentation.dir/src && /usr/bin/cmake -E make_directory /home/sergey/Workspace/Libraries/pcl/build-1-10/cuda/segmentation/CMakeFiles/pcl_cuda_segmentation.dir/src/. && /usr/bin/cmake -D verbose:BOOL=OFF -D build_configuration:STRING=Release -D generated_file:STRING=/home/sergey/Workspace/Libraries/pcl/build-1-10/cuda/segmentation/CMakeFiles/pcl_cuda_segmentation.dir/src/./pcl_cuda_segmentation_generated_connected_components.cu.o -D generated_cubin_file:STRING=/home/sergey/Workspace/Libraries/pcl/build-1-10/cuda/segmentation/CMakeFiles/pcl_cuda_segmentation.dir/src/./pcl_cuda_segmentation_generated_connected_components.cu.o.cubin.txt -P /home/sergey/Workspace/Libraries/pcl/build-1-10/cuda/segmentation/CMakeFiles/pcl_cuda_segmentation.dir/src/pcl_cuda_segmentation_generated_connected_components.cu.o.Release.cmake
In file included from /home/sergey/Workspace/Libraries/pcl/common/include/pcl/pcl_macros.h:75:0,
                 from /home/sergey/Workspace/Libraries/pcl/common/include/pcl/point_traits.h:45,
                 from /home/sergey/Workspace/Libraries/pcl/common/include/pcl/make_shared.h:47,
                 from /home/sergey/Workspace/Libraries/pcl/cuda/common/include/pcl/cuda/point_cloud.h:42,
                 from /home/sergey/Workspace/Libraries/pcl/cuda/segmentation/src/connected_components.cu:40:
/usr/include/eigen3/Eigen/Core:42:14: fatal error: math_functions.hpp: No such file or directory
     #include <math_functions.hpp>
              ^~~~~~~~~~~~~~~~~~~~
compilation terminated.

[taketwo]

Sorry, did not notice the other PR (can we join them into one?) Still, after applying that patch I still get numerous errors in gpu module.

[kunaltyagi]

I'll apply those changes here. I can't compile gpu kinfu. CMake doesn't recognize my openni. The docker images will really help in this regard

[kunaltyagi]

PTAL

[taketwo]

Thanks, this solves the shared_ptr-related compiler errors for me.

The math_functions.hpp-related issues are still present. Apparently that's an Eigen issue that has been fixed. Not sure in which release though (definitely not in 3.3.4 that comes with 18.04). According to the referenced commit message, the issue appeared in CUDA 9.1. So what we may want to do is use [Ubuntu 16.04 + CUDA 9.0] image on CI to make sure we don't hit this error. But that's offtopic for this PR anyway.