Fix compilation with cmake on Windows

[nikolaitasev]

Here are some fixes that make it possible to compile with cmake and msvc on Windows.

[FantasyVR]

I update the CMakeLists.txt based on your pull request. But when I build project on visual studio 2017 and cuda 10.0. I get the following errors:

1>------ Build started: Project: ZERO_CHECK, Configuration: Debug x64 ------
2>------ Build started: Project: HW1, Configuration: Debug x64 ------
2>Building NVCC (Device) object ProblemSets/ProblemSet1/CMakeFiles/HW1.dir/Debug/HW1_generated_student_func.cu.obj
2>CMake Error at HW1_generated_student_func.cu.obj.Debug.cmake:219 (message):
2>  Error generating
2>  F:/OpenSource/cs344/build/ProblemSets/ProblemSet1/CMakeFiles/HW1.dir//Debug/HW1_generated_student_func.cu.obj
2>
2>
2>D:\Microsoft Visual Studio\2017\Common7\IDE\VC\VCTargets\Microsoft.CppCommon.targets(209,5): error MSB6006: "cmd.exe" exited with code 1.
2>Done building project "HW1.vcxproj" -- FAILED.
========== Build: 1 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

The CMakeLists.txt is as below:

############################################################################
# <summary> CMakeLists.txt for OpenCV and CUDA. </summary>
# <date>    2012-02-07          </date>
# <author>  Quan Tran Minh. edit by Johannes Kast, Michael Sarahan </author>
# <email>   quantm@unist.ac.kr  kast.jo@googlemail.com msarahan@gmail.com</email>
############################################################################

cmake_minimum_required(VERSION 2.6 FATAL_ERROR)
project(cs344)

find_package(OpenCV REQUIRED)
find_package(CUDA REQUIRED)

link_libraries(${OpenCV_LIBS} )

set (EXECUTABLE_OUTPUT_PATH "${CMAKE_SOURCE_DIR}/bin/")

if(CUDA_FOUND)
  # compared to class settings, we let NVidia's FindCUDA CMake detect 
  # whether to build x64.  We tell it to support most devices, though, 
  # to make sure more people can easily run class code without knowing 
  # about this compiler argument
  set(CUDA_NVCC_FLAGS "-gencode;arch=compute_75,code=sm_75;")  #GTX 2080 Ti

  # add -Wextra compiler flag for gcc compilations
  if (UNIX)
    set(CUDA_NVCC_FLAGS ${CUDA_NVCC_FLAGS} "-ccbin /usr/bin/clang")
    set(CUDA_NVCC_FLAGS ${CUDA_NVCC_FLAGS} "-Xcompiler -Wextra")
    set(CMAKE_CXX_FLAGS "-stdlib=libstdc++")
  endif (UNIX)

  # add debugging to CUDA NVCC flags.  For NVidia's NSight tools.
  set(CUDA_NVCC_FLAGS_DEBUG ${CUDA_NVCC_FLAGS_DEBUG} "-G")

  add_subdirectory (ProblemSets)

else(CUDA_FOUND)
  message("CUDA is not installed on this system.")
endif()