CMake: CUDA libraries not found when compiling OpenCV

Question

I am compiling OpenCV 3.0.0 with CUDA support on Windows, using CMAKE. When I click "configure", errors occur as following:

CMake Error: The following variables are used in this project, but they are set to NOTFOUND.
Please set them or make sure they are set and tested correctly in the CMake files:
CUDA_cufft_LIBRARY (ADVANCED)
    linked by target "opencv_hal" in directory E:/dev-lib/opencv3/sources/modules/hal
    ...
CUDA_nppc_LIBRARY (ADVANCED)
    ...
CUDA_nppi_LIBRARY (ADVANCED)
    ...
CUDA_npps_LIBRARY (ADVANCED)

I have checked "WITH_CUDA" and "WITH_CUFFT" in entries. If I check "WITH_CUBLAS" as well, the outputs above will add one more CUDA_cublas_LIBRARY error.

But before all these error messages it shows that

CUDA detected: 7.5
CUDA NVCC target flags: -gencode;arch=compute_20,code=sm_20;-gencode;arch=compute_20,code=sm_21;-gencode;arch=compute_30,code=sm_30;-gencode;arch=compute_35,code=sm_35;-gencode;arch=compute_30,code=compute_30

which indicates CUDA can be detected by CMAKE. However, those 4 libraries needed cannot be found.

I have installed CUDA 7.5 and compiled it with Visual Studio 2012 before. The CUDA samples run perfectly. So my CUDA libraries should be installed properly.

I wonder even if I have to set these values manually, how should I do it?

My specs: Windows 7 x64, Visual Studio 2012, CMAKE 3.4.0, CUDA Toolkit 7.5

Answer 1

Thanks to tips from Drop in the comments, I solved this problem. In order to close this question, I'm answering my own question.

It's a "Win32 or x64" architecture problem. Since NVIDIA only provides cufft, nvblas, nppc, nppi, npps libs for x64, it's naturally impossible for CMAKE to find these libs for configuring a Win32 OpenCV library.

My solution was to choose Visual Studio 11 Win64 instead of Visual Studio 11 as generator in CMAKE. So that CMAKE will automatically load libs from <CUDA_DIR>\lib\x64 rather than <CUDA_DIR>\lib\Win32. Further more, I also need to load all the other libs required by OpenCV in 64 bit version, such as OpenGL. I will also need to compile OpenCV in x64 architecture. All the code I'm going to write in the future will have to build and debug in x64 only.

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Should one have no trouble reading Chinese materials, I'm happy to provide a link towards a post regarding the complete guide on building OpenCV 3.0 on VS2012 with CUDA supports.