Compilation error under Win7 VS2012 x64 Cuda 5.5RC for Cuda static

[frmir]

Hi Marius,

I get two types of error when compiling the flann_cuda_s project:

Error 10 error : no operator "+" matches these operands C:\Users\id\Documents\Code\flann-1.8.4-src\src\cpp\flann\util\params.h 114

Error 20 error : calling a device function("SingleResultSet") from a host function("knnSearchGpu") is not allowed C:\Users\id\Documents\Code\flann-1.8.4-src\src\cpp\flann\algorithms\kdtree_cuda_3d_index.cu 323

The first appears only once, the second appears 47 times. I wonder more about the second error. Do you have any idea ?

[mya1114]

I've got the same setting with frmir, and am facing the same problem. I've looked into the kdtree_cuda_3d_index.cu file, and it seems there should be no issue unless Nvidia has made some changes in the way to call a device function in their new Cuda release. Can anybody help to resovle this issues please?

[rob100]

NVidia changed the default behavior with CUDA 5. The problem is, that the methods in result_set.h are used on device as well as on host. You can fix this with declaring all methods in result_set.h from device to device host. Then the methods will be compiled twice, once for device usage, once for host usage. For example:

__device__
SingleResultSet( DistanceType eps ) : bestIndex(-1),bestDist(INFINITY), epsError(eps){ }
// change to:
__device__ __host__
SingleResultSet( DistanceType eps ) : bestIndex(-1),bestDist(INFINITY), epsError(eps){ }

Additionally you need to change the infinity() method because ___int_asfloat is device only:

__device__ __host__ __forceinline__
float infinity()
{
     //return __int_as_float(0x7f800000);
    return 2139095040.f;
     // This seems either way to be a better solution, because infinity is a constant
}

This is not the best solution, but it will work until somebody will rebuild the architecture.

[mya1114]

Thank you so much, rob100. Additionally I had to change all the search functions (i.e., knnSearch() and radisuSearch()) in nn_index.h to virtual functions otherwise those functions of CUDA implementation in kdtree_cuda_3d_index.cuh are not called with the KdTreeCuda3dIndex index type. This might be only my case, but I thought I should mention it anyway.

[Ryosaji]

Hi, there, I have the same problems of flann_cuda_s project under Win7 VS2010 x64 Cuda 7.5. Thanks to your explanation, I fixed the two problems in "result_set.h" which are changed from device to device host and the infinity() method. However, I still have the problem in "param.h", which has : ..\flann-master\src\cpp\flann/util/params.h(114): error : no operator "+" matches these operands operand types are: std::string + std::string

The cod "params.h(114)" is: throw FLANNException(std::string("Missing parameter '")name+std::string("' in the parameters given")); Have you fixed the problem mentioned above? Could you please let me know how to fix it?

Thank you in advance.

[razieh90]

You can solve this problem "..\flann-master\src\cpp\flann/util/params.h(114): error : no operator "+" matches these operands", by doing two following modifications in param.h 1- by changing this line:

include "iostream" into

include < iostream >

2- and adding srings as:

include < string >