RISCV OpenCV Linker Error

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1

Hi,

The OpenCV version is 4.6.0-dev
My system is Ubuntu 20.04
I’m using RISCV GNU Toolchain.

I can run the basic image processing codes with gcc and RISCV but when I’m trying to compile the Googlenet sample code in this link I have got this errors.

Even when I try to compile the code with gcc or RISCV, I got the same linker error.

gcc main.cpp -o sone -I /home/anil/Desktop/project/opencv/include/ -I /home/anil/Desktop/project/opencv/modules/core/include -I /home/anil/Desktop/project/opencv/build/install/include/opencv4 -I /home/anil/Desktop/project/opencv/modules/core/include/opencv2 -I /home/anil/Desktop/project/riscv-gnu-toolchain/gdb/zlib -I /home/anil/Desktop/deneme/gitdene/cnpy/ -I /usr/include/mkl -L/home/anil/Desktop/project/opencv/build/lib -lopencv_core -lopencv_imgcodecs -lopencv_imgproc -I /home/anil/Desktop/project/opencv/samples/dnn/ -I/usr/local/cuda/include
/bin/ld: skipping incompatible /home/anil/Desktop/project/opencv/build/lib/libopencv_core.so when searching for -lopencv_core
/bin/ld: cannot find -lopencv_core
/bin/ld: skipping incompatible /home/anil/Desktop/project/opencv/build/lib/libopencv_imgcodecs.so when searching for -lopencv_imgcodecs
/bin/ld: cannot find -lopencv_imgcodecs
/bin/ld: skipping incompatible /home/anil/Desktop/project/opencv/build/lib/libopencv_imgproc.so when searching for -lopencv_imgproc
/bin/ld: cannot find -lopencv_imgproc
collect2: error: ld returned 1 exit status

riscv64-unknown-linux-gnu-g++ main.cpp -o sone -I /home/anil/Desktop/project/opencv/include/ -I /home/anil/Desktop/project/opencv/modules/core/include -I /home/anil/Desktop/project/opencv/build/install/include/opencv4 -I /home/anil/Desktop/project/opencv/modules/core/include/opencv2 -I /home/anil/Desktop/project/riscv-gnu-toolchain/gdb/zlib -I /home/anil/Desktop/deneme/gitdene/cnpy/ -I /usr/include/mkl -L/home/anil/Desktop/project/opencv/build/lib -lopencv_core -lopencv_imgcodecs -lopencv_imgproc -I /home/anil/Desktop/project/opencv/samples/dnn/ -I/usr/local/cuda/include --static
/opt/riscv/lib/gcc/riscv64-unknown-linux-gnu/12.2.0/../../../../riscv64-unknown-linux-gnu/bin/ld: cannot find -lopencv_core: No such file or directory
/opt/riscv/lib/gcc/riscv64-unknown-linux-gnu/12.2.0/../../../../riscv64-unknown-linux-gnu/bin/ld: cannot find -lopencv_imgcodecs: No such file or directory
/opt/riscv/lib/gcc/riscv64-unknown-linux-gnu/12.2.0/../../../../riscv64-unknown-linux-gnu/bin/ld: cannot find -lopencv_imgproc: No such file or directory
collect2: error: ld returned 1 exit status

The main problem is linker in the linker I think, but the LD_LİBRARY_PATH is defined as shown below

root@ubuntu:/home/anil/Desktop/googlenet# echo $LD_LIBRARY_PATH
/home/anil/Desktop/project/opencv/build/lib

and the inside of this path is:

aa
aa1575×164 54.4 KB 

root@ubuntu:/home/anil/Desktop/googlenet# ls /home/anil/Desktop/project/opencv/build/lib
libopencv_calib3d.so        libopencv_dnn.so.4.6.0         libopencv_gapi.so.406         libopencv_imgproc.so        libopencv_objdetect.so.4.6.0  libopencv_videoio.so
libopencv_calib3d.so.406    libopencv_features2d.so        libopencv_gapi.so.4.6.0       libopencv_imgproc.so.406    libopencv_photo.so            libopencv_videoio.so.406
libopencv_calib3d.so.4.6.0  libopencv_features2d.so.406    libopencv_highgui.so          libopencv_imgproc.so.4.6.0  libopencv_photo.so.406        libopencv_videoio.so.4.6.0
libopencv_core.so           libopencv_features2d.so.4.6.0  libopencv_highgui.so.406      libopencv_ml.so             libopencv_photo.so.4.6.0      libopencv_video.so
libopencv_core.so.406       libopencv_flann.so             libopencv_highgui.so.4.6.0    libopencv_ml.so.406         libopencv_stitching.so        libopencv_video.so.406
libopencv_core.so.4.6.0     libopencv_flann.so.406         libopencv_imgcodecs.so        libopencv_ml.so.4.6.0       libopencv_stitching.so.406    libopencv_video.so.4.6.0
libopencv_dnn.so            libopencv_flann.so.4.6.0       libopencv_imgcodecs.so.406    libopencv_objdetect.so      libopencv_stitching.so.4.6.0
libopencv_dnn.so.406        libopencv_gapi.so              libopencv_imgcodecs.so.4.6.0  libopencv_objdetect.so.406  libopencv_ts.a

Do you have any suggestions?

2

are you trying to cross-compile? did you tell the compiler/toolchain this?

did you compile those OpenCV module libraries? did you compile them for RISCV?

the official binary releases probably don’t include binaries for RV yet.

3

Hi,
Im trying to cross compile and followed this link.

Sample image processing applications can run on RISCV like image denoising, filtering and edge detection. But this libraries didn’t use the libraries which are shown above.