【记录一个问题】opencv + cuda编译release版本后，链接出现奇怪的符号

链接出现以下信息：

 1 /home/admin/opencv/20190610_cuda_release/lib64/libopencv_core.a(ocl.cpp.o): In function `cv::ocl::Context::Impl::svmInit()':
 2 ocl.cpp:(.text._ZN2cv3ocl7Context4Impl7svmInitEv[_ZN2cv3ocl7Context4Impl7svmInitEv]+0x133): undefined reference to `clSVMAlloc_pfn'
 3 ocl.cpp:(.text._ZN2cv3ocl7Context4Impl7svmInitEv[_ZN2cv3ocl7Context4Impl7svmInitEv]+0x16e): undefined reference to `clEnqueueSVMMap_pfn'
 4 ocl.cpp:(.text._ZN2cv3ocl7Context4Impl7svmInitEv[_ZN2cv3ocl7Context4Impl7svmInitEv]+0x1aa): undefined reference to `clEnqueueSVMUnmap_pfn'
 5 ocl.cpp:(.text._ZN2cv3ocl7Context4Impl7svmInitEv[_ZN2cv3ocl7Context4Impl7svmInitEv]+0x1dd): undefined reference to `clSVMFree_pfn'
 6 ocl.cpp:(.text._ZN2cv3ocl7Context4Impl7svmInitEv[_ZN2cv3ocl7Context4Impl7svmInitEv]+0x204): undefined reference to `clSetKernelArgSVMPointer_pfn'
 7 ocl.cpp:(.text._ZN2cv3ocl7Context4Impl7svmInitEv[_ZN2cv3ocl7Context4Impl7svmInitEv]+0x215): undefined reference to `clEnqueueSVMMemcpy_pfn'
 8 ocl.cpp:(.text._ZN2cv3ocl7Context4Impl7svmInitEv[_ZN2cv3ocl7Context4Impl7svmInitEv]+0x226): undefined reference to `clEnqueueSVMMemFill_pfn'
 9 ocl.cpp:(.text._ZN2cv3ocl7Context4Impl7svmInitEv[_ZN2cv3ocl7Context4Impl7svmInitEv]+0x237): undefined reference to `clEnqueueSVMMap_pfn'
10 ocl.cpp:(.text._ZN2cv3ocl7Context4Impl7svmInitEv[_ZN2cv3ocl7Context4Impl7svmInitEv]+0x4b7): undefined reference to `clSVMFree_pfn'
11 collect2: error: ld returned 1 exit status
12 make[2]: *** [test_kcf] Error 1
13 make[1]: *** [CMakeFiles/test_kcf.dir/all] Error 2
14 make: *** [all] Error 2

_pfn的后缀，其实是define出来的应该不能算是一个符号！
说明编译的时候把宏当成了一个符号……
未解决！

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重新编译opencv，将WITH_OPENCL的所有选项关闭。
重新编译链接程序，解决！