ubuntu opencv compilation error/bug with cuda 8.0 RC

使用源码编译opencv master分支（3.1.0）时，出现如下错误：

/usr/local/cuda/include/thrust/detail/reference.inl(127): error: no default constructor exists for class "thrust::detail::execute_with_allocator"
          detected during:
            instantiation of "void thrust::reference::assign_from(OtherPointer) [with Element=float2, Pointer=thrust::pointer, thrust::use_default, thrust::use_default>, Derived=thrust::use_default, OtherPointer=const float2 *]" 
(65): here

......

4 errors detected in the compilation of "/tmp/tmpxft_00003fb9_00000000-17_gftt.compute_60.cpp1.ii".
CMake Error at cuda_compile_generated_gftt.cu.o.cmake:264 (message):
  Error generating file
  /home/chengxiang/workspace/opencv/build/modules/cudaimgproc/CMakeFiles/cuda_compile.dir/src/cuda/./cuda_compile_generated_gftt.cu.o

modules/cudaimgproc/CMakeFiles/opencv_cudaimgproc.dir/build.make:3603: recipe for target 'modules/cudaimgproc/CMakeFiles/cuda_compile.dir/src/cuda/cuda_compile_generated_gftt.cu.o' failed
make[2]: *** [modules/cudaimgproc/CMakeFiles/cuda_compile.dir/src/cuda/cuda_compile_generated_gftt.cu.o] Error 1
CMakeFiles/Makefile2:4419: recipe for target 'modules/cudaimgproc/CMakeFiles/opencv_cudaimgproc.dir/all' failed
make[1]: *** [modules/cudaimgproc/CMakeFiles/opencv_cudaimgproc.dir/all] Error 2
Makefile:160: recipe for target 'all' failed

这是一个cuda8.0 rc版本bug, 使用github上的thrust 1.8.3tag替换cuda8.0rc安装时的thrust即可.

# find the thrust directory
find /usr/local/cuda -type d -name "thrust" 
# clone the 1.8.3 thrust from github
git clone https://github.com/thrust/thrust.git -b 1.8.3
# diff them
diff -u thrust /usr/local/cuda/include/thrust
# backup the cuda/thrust
sudo mv /usr/local/cuda/include/thrust /usr/local/cuda/include/thrust_old
# move the thrust to cuda dir
sudo mv ./thrust /usr/local/cuda/include/thrust

实际测试通过，配置如下：

• opencv：3.1.0（master）
• cuda：8.0.26