installing 3.4.12 for ubuntu 18.04 LTS (install from source) for yolov4

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What cmake configuration options did you use? Did you try compiling it without OpenCL support?

please also try with a more recent version, 3.4.0 is years old, and noone can reproduce your problems anymore

Before u installed opencv3.4.0. Didn't u update and upgrade before ?

i did update and upgrade

R u on raspberry pi? What's model?

How do i check my cmake configuration options, I basically just accessed a directory, then "make -j4". I followed this website: https://www.pytorials.com/how-to-inst...

Except for sudo apt-get install python2.7-dev python3.5-dev, where i changed it to python3.6, since my linux doesnt have python3.5.

Uh no, this isn't raspberry pi, this is on my pc. It is nvidia GE MTX 130 series if that helps.

@berak Im just afraid that the recent version will be incompatible

How do i check my cmake configuration options,

please add the cmake console output to your question (it's rather long)

what do you mean -- "incompatible" ?

get recent github src, and build from that ! (don't rely on ubuntu's ppm, which will only drag in outdated stuff)

That fine with nvidia GE MTX 130. But it didn't tell u how many cores. Unfortunately, u can't do make -j4. U merely have one core that is make -j1 Kindly, do not used link that is outdated. U don't needed to do this sudo apt-get install python2.7-dev python3.5-dev. U can download manual python 3.10. U can also download OpenCV 4.5.1-pre. It will works on linux too. Used pyimagesearch or learnopencv from website.

When I checked the nproc command, I get 8. I wanted to use the opencv as a dependecy for a application called Yolov4 . Can it work if I got a higher version of opencv

It will not work on older opencv version. YOLO have been released named YOLO v4, YOLO v5 and PP-YOLO will work on OpenCV 4 or later. Are you going to install latest OpenCV 4.5.x version or not?

I wanted to use the opencv as a dependecy for a application called Yolov4

in that case, try latest 3.4.12 release

(and no, opencv4 probably won't work, since the darknet code relies on deprecated c-api functionality, which was removed in opencv4)

@berak so i tried to install 3.4.12, and i followed this: https://linuxize.com/post/how-to-inst...

on step 2, instead of

 git clone https://github.com/opencv/opencv.git
git clone https://github.com/opencv/opencv_contrib.git

since that would install 4.5, i did:

 https://github.com/opencv/opencv/archive/3.4.12.zip -O opencv-3.4.12.zip
https://github.com/opencv/opencv_contrib/archive/3.4.12.zip -O opencv_contrib-3.4.12.zip
unzip opencv-3.4.12.zip
unzip opencv_contrib-3.4.12.zip

then i did this:

cmake -D CMAKE_BUILD_TYPE=RELEASE \

-D CMAKE_INSTALL_PREFIX=/usr/local \
-D INSTALL_C_EXAMPLES=ON \
-D INSTALL_PYTHON_EXAMPLES=ON \
-D OPENCV_GENERATE_PKGCONFIG=ON \
-D OPENCV_EXTRA_MODULES_PATH=~/opencv_build/opencv_contrib-3.4.12/modules\>     -D BUILD_EXAMPLES=ON ..

which resulted in this:

Configuring incomplete, errors occurred!
See also "/home/ryan/opencv_build/opencv-3.4.12/build/CMakeFiles/CMakeOutput.log".
See also "/home/ryan/opencv_build/opencv-3.4.12/build/CMakeFiles/CMakeError.log".

what did i not do properly, thanks for reading this.

on the error log:

    enter codBuild output check failed:
    Regex: 'argument .* is not valid'
    Output line: 'cc1: warning: ‘-Werror=’ argument ‘-Werror=non-virtual-dtor’ is not valid for C'
Compilation failed:
    source file: '/home/ryan/opencv_build/opencv-3.4.12/build/CMakeFiles/CMakeTmp/src.c'
    check option: ' -fsigned-char -W -Wall -Werror=return-type  -Werror=non-virtual-dtor'
===== BUILD LOG =====
Change Dir: /home/ryan/opencv_build/opencv-3.4.12/build/CMakeFiles/CMakeTmp
e here

Build output check failed: Regex: 'command[- ]line option .* is valid for .* but not for C' Output line: 'cc1: warning: command line option ‘-Wsign-promo’ is valid for C++/ObjC++ but not for C' Compilation failed: source file: '/home/ryan/opencv_build/opencv-3.4.12/build/CMakeFiles/CMakeTmp/src.c' check option: ' -fsigned-char -W -Wall -Werror=return-type -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo' ===== BUILD LOG ===== Change Dir: /home/ryan/opencv_build/opencv-3.4.12/build/CMakeFiles/CMakeTmp

    Run Build Command:"/usr/bin/make" "cmTC_5f46e/fast"