Compile OpenCV without GPU?

Question

I've just run cmake -D CMAKE_BUILD_TYPE=RELEASE .. from OpenCV/build, and got in my output:

--   OpenCV modules:
--     To be built:                 core imgproc flann highgui features2d calib3d ml video
                                    objdetect contrib nonfree gpu legacy photo python
                                    stitching ts videostab
--     Disabled:                    -
--     Disabled by dependency:      -
--     Unavailable:                 androidcamera java world

The thing is, compilation with gpu fails, maybe because my machine doesn't have one? (It's an EC2 instance).

make fails with an odd error:

Scanning dependencies of target opencv_test_gpu
[ 72%] Building CXX object modules/gpu/CMakeFiles/opencv_test_gpu.dir/test/test_gpumat.cpp.o
[ 72%] Building CXX object modules/gpu/CMakeFiles/opencv_test_gpu.dir/test/utility.cpp.o
[ 73%] Building CXX object modules/gpu/CMakeFiles/opencv_test_gpu.dir/test/test_filters.cpp.o
[ 73%] Building CXX object modules/gpu/CMakeFiles/opencv_test_gpu.dir/test/test_copy_make_border.cpp.o
[ 73%] Building CXX object modules/gpu/CMakeFiles/opencv_test_gpu.dir/test/main.cpp.o
[ 73%] Building CXX object modules/gpu/CMakeFiles/opencv_test_gpu.dir/test/test_threshold.cpp.o
[ 73%] Building CXX object modules/gpu/CMakeFiles/opencv_test_gpu.dir/test/test_video.cpp.o
[ 73%] Building CXX object modules/gpu/CMakeFiles/opencv_test_gpu.dir/test/test_core.cpp.o
c++: internal compiler error: Killed (program cc1plus)
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-4.6/README.Bugs> for instructions.
make[2]: *** [modules/gpu/CMakeFiles/opencv_test_gpu.dir/test/test_core.cpp.o] Error 4
make[1]: *** [modules/gpu/CMakeFiles/opencv_test_gpu.dir/all] Error 2
make: *** [all] Error 2

I've tried using the flag -DOPENCV_MODULES_DISABLED_USER="gpu" but that produces weird output with gpu listed as to be built and disabled.

--   OpenCV modules:
--     To be built:                 core imgproc flann highgui features2d calib3d ml video objdetect contrib nonfree gpu legacy photo python stitching ts videostab
--     Disabled:                    gpu
--     Disabled by dependency:      -
--     Unavailable:                 androidcamera java world

How do I compile without gpu?

Answer 1

To disable building a specific module, use

-D BUILD_opencv_{modulename}=OFF

In this case, use

-D BUILD_opencv_gpu=OFF

Answer 2

Try to add -D WITH_CUDA=OFF to your cmake command line.

Answer 3

For OpenCV 2.4.11 on EC2, I had to include both -D BUILD_opencv_gpu=OFF and -D WITH_CUDA=OFF. I also included -D WITH_1394=OFF to avoid a warning in python. So:

cd opencv-2.4.11/
mkdir release
cd release/
cmake -D BUILD_opencv_gpu=OFF -D WITH_CUDA=OFF -D WITH_1394=OFF -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local ..
make
sudo make install

Answer 4

This is caused by not having enough memory with your EC2 instance. I got a similar error (different module) with an EC2/Micro running Ubuntu 12.10, but it was smooth sailing on an EC2/Small.