I met some problems in building opencv3.0 with cuda7.5 ( gpu GeForce 940M ) in ubuntu14.04.
Firstly, I tried opencv2.4.9 with cuda7.5 in ubuntu14.04 with cmake-gui, and replaced one header file, NV**.h (sorry, I forgot), and finally it succeeded!
However, I tried opencv3.0 with the same configuration, it failed in wired errors about tbb.....
In addition, I have chosen the "WITH_TBB" and "BUILD_TBB", and downloaded the file successfully, so theoretically, it wouldn't break out errors, but it did......
HERE IS THE COPY OF THE ERRORS
Scanning dependencies of target opencv_traincascade
[ 81%] Building CXX object apps/traincascade/CMakeFiles/opencv_traincascade.dir/lbpfeatures.cpp.o
[ 81%] Building CXX object apps/traincascade/CMakeFiles/opencv_traincascade.dir/HOGfeatures.cpp.o
[ 81%] Building CXX object apps/traincascade/CMakeFiles/opencv_traincascade.dir/old_ml_tree.cpp.o
[ 81%] Building CXX object apps/traincascade/CMakeFiles/opencv_traincascade.dir/old_ml_data.cpp.o
[ 81%] Building CXX object apps/traincascade/CMakeFiles/opencv_traincascade.dir/cascadeclassifier.cpp.o
[ 81%] Building CXX object apps/traincascade/CMakeFiles/opencv_traincascade.dir/old_ml_boost.cpp.o
[ 82%] Building CXX object apps/traincascade/CMakeFiles/opencv_traincascade.dir/old_ml_inner_functions.cpp.o
[ 82%] Building CXX object apps/traincascade/CMakeFiles/opencv_traincascade.dir/features.cpp.o
[ 82%] Building CXX object apps/traincascade/CMakeFiles/opencv_traincascade.dir/traincascade.cpp.o
[ 82%] Building CXX object apps/traincascade/CMakeFiles/opencv_traincascade.dir/boost.cpp.o
[ 82%] Building CXX object apps/traincascade/CMakeFiles/opencv_traincascade.dir/haarfeatures.cpp.o
[ 82%] Building CXX object apps/traincascade/CMakeFiles/opencv_traincascade.dir/imagestorage.cpp.o
Linking CXX executable ../../bin/opencv_traincascade
CMakeFiles/opencv_traincascade.dir/old_ml_tree.cpp.o: In function `CvDTree::find_best_split(CvDTreeNode*)':
old_ml_tree.cpp:(.text+0x69fd): undefined reference to `tbb::task_group_context::init()'
old_ml_tree.cpp:(.text+0x6a0e): undefined reference to `tbb::internal::allocate_root_with_context_proxy::allocate(unsigned long) const'
old_ml_tree.cpp:(.text+0x6a41): undefined reference to `tbb::internal::get_initial_auto_partitioner_divisor()'
old_ml_tree.cpp:(.text+0x6a69): undefined reference to `tbb::task_group_context::~task_group_context()'
old_ml_tree.cpp:(.text+0x6ae3): undefined reference to `tbb::task_group_context::~task_group_context()'
old_ml_tree.cpp:(.text+0x6af5): undefined reference to `vtable for tbb::task'
old_ml_tree.cpp:(.text+0x6b00): undefined reference to `tbb::internal::allocate_root_with_context_proxy::free(tbb::task&) const'
CMakeFiles/opencv_traincascade.dir/old_ml_tree.cpp.o: In function `tbb::interface6::internal::start_reduce<tbb::blocked_range<int>, cv::DTreeBestSplitFinder, tbb::auto_partitioner const>::~start_reduce()':
old_ml_tree.cpp:(.text._ZN3tbb10interface68internal12start_reduceINS_13blocked_rangeIiEEN2cv20DTreeBestSplitFinderEKNS_16auto_partitionerEED2Ev[_ZN3tbb10interface68internal12start_reduceINS_13blocked_rangeIiEEN2cv20DTreeBestSplitFinderEKNS_16auto_partitionerEED5Ev]+0x3): undefined reference to `vtable for tbb::task'
CMakeFiles/opencv_traincascade.dir/old_ml_tree.cpp.o: In function `tbb::interface6::internal::flag_task::~flag_task()':
old_ml_tree.cpp:(.text._ZN3tbb10interface68internal9flag_taskD2Ev[_ZN3tbb10interface68internal9flag_taskD5Ev]+0x3): undefined reference to `vtable for tbb::task'
CMakeFiles/opencv_traincascade.dir/old_ml_tree.cpp.o: In function `tbb::interface6::internal::finish_reduce<cv::DTreeBestSplitFinder>::~finish_reduce()':
old_ml_tree.cpp:(.text._ZN3tbb10interface68internal13finish_reduceIN2cv20DTreeBestSplitFinderEED2Ev[_ZN3tbb10interface68internal13finish_reduceIN2cv20DTreeBestSplitFinderEED5Ev]+0x3): undefined reference to `vtable for tbb::task'
CMakeFiles/opencv_traincascade.dir/old_ml_tree.cpp.o: In function `tbb::interface6::internal::signal_task::~signal_task()':
old_ml_tree.cpp:(.text._ZN3tbb10interface68internal11signal_taskD2Ev[_ZN3tbb10interface68internal11signal_taskD5Ev]+0x3): undefined reference to `vtable for tbb::task'
CMakeFiles/opencv_traincascade.dir/old_ml_tree.cpp.o: In function `tbb::interface6::internal::start_reduce<tbb::blocked_range<int>, cv::DTreeBestSplitFinder, tbb::auto_partitioner const>::~start_reduce()':
old_ml_tree.cpp:(.text._ZN3tbb10interface68internal12start_reduceINS_13blocked_rangeIiEEN2cv20DTreeBestSplitFinderEKNS_16auto_partitionerEED0Ev[_ZN3tbb10interface68internal12start_reduceINS_13blocked_rangeIiEEN2cv20DTreeBestSplitFinderEKNS_16auto_partitionerEED0Ev]+0x3): undefined reference to `vtable for tbb::task'
CMakeFiles/opencv_traincascade.dir/old_ml_tree.cpp.o:old_ml_tree.cpp:(.text._ZN3tbb10interface68internal9flag_taskD0Ev[_ZN3tbb10interface68internal9flag_taskD0Ev]+0x3): more undefined references ...
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