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OpenCV 4.x+ requires enabled C++11 support #1754

Open
hobbes3 opened this issue Aug 1, 2019 · 9 comments
Open

OpenCV 4.x+ requires enabled C++11 support #1754

hobbes3 opened this issue Aug 1, 2019 · 9 comments

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@hobbes3
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hobbes3 commented Aug 1, 2019

I'm trying to compile darknet with OpenCV on my macOS 10.14.3 (Mojave). Here is basically what I did:

I installed OpenCV via brew install opencv and it gave me version 4.1.0 (confirmed via opencv_version.

./darknet imtest data/eagle.jpg works fine so I know OpenCV installed somewhat successfully. Next, I try to make darknet again.

At first it complained about not finding opencv.pc, but I made a symlink opencv.pc to point to opencv4.pc in /usr/local/lib/pkgconfig/.

But now it complains about the following:

[hobbes3@hobbes3-4] ~/darknet $ make
g++ -Iinclude/ -Isrc/ -DOPENCV `pkg-config --cflags opencv`  -Wall -Wno-unused-result -Wno-unknown-pragmas -Wfatal-errors -fPIC -Ofast -DOPENCV -c ./src/image_opencv.cpp -o obj/image_opencv.o
In file included from ./src/image_opencv.cpp:5:
In file included from /usr/local/Cellar/opencv/4.1.0_2/include/opencv4/opencv2/opencv.hpp:52:
In file included from /usr/local/Cellar/opencv/4.1.0_2/include/opencv4/opencv2/core.hpp:52:
/usr/local/Cellar/opencv/4.1.0_2/include/opencv4/opencv2/core/cvdef.h:666:4: fatal error: "OpenCV 4.x+ requires enabled C++11 support"
#  error "OpenCV 4.x+ requires enabled C++11 support"
   ^
1 error generated.
make: *** [obj/image_opencv.o] Error 1

What do I need to do next?
@Liedermaus
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Liedermaus commented Aug 8, 2019 •
edited
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Just use 3.4.0
This is the last version that worked for me. All later versions up to 3.4.7 and 4.x won't work...
You will also need to disable CUDA supprt or al the least the videocodecs with cuda for Opencv...

@1vash
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1vash commented Sep 11, 2019 •
edited
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I have got the same issue on Ubuntu 18.04. Symlink is done also for pkg-config. Kinda downgrade of opencv is needed.
But anyway, Leave cmake configuration here

cmake -D CMAKE_INSTALL_PREFIX=/usr/local \
    -D INSTALL_PYTHON_EXAMPLES=OFF \
    -D INSTALL_C_EXAMPLES=OFF \
    -D BUILD_opencv_python2=OFF \
    -D BUILD_EXAMPLES=OFF \
    -D WITH_GSTREAMER=ON \
    -D OPENCV_EXTRA_MODULES_PATH=/opencv_contrib-${OPENCV_VERSION}/modules \
    -D CMAKE_BUILD_TYPE=Release \
    -D PYTHON3_EXECUTABLE=$(which python3) \
    -D ENABLE_PRECOMPILED_HEADERS=OFF \
    -D OPENCV_GENERATE_PKGCONFIG=ON ..

/darknet# make
mkdir -p obj
mkdir -p backup
mkdir -p results
gcc -Iinclude/ -Isrc/ -DOPENCV `pkg-config --cflags opencv4`  -DGPU -I/usr/local/cuda/include/ -Wall -Wno-unused-result -Wno-unknown-pragmas -Wfatal-errors -fPIC -Ofast -DOPENCV -DGPU -c ./src/gemm.c -o obj/gemm.o
gcc -Iinclude/ -Isrc/ -DOPENCV `pkg-config --cflags opencv4`  -DGPU -I/usr/local/cuda/include/ -Wall -Wno-unused-result -Wno-unknown-pragmas -Wfatal-errors -fPIC -Ofast -DOPENCV -DGPU -c ./src/utils.c -o obj/utils.o
gcc -Iinclude/ -Isrc/ -DOPENCV `pkg-config --cflags opencv4`  -DGPU -I/usr/local/cuda/include/ -Wall -Wno-unused-result -Wno-unknown-pragmas -Wfatal-errors -fPIC -Ofast -DOPENCV -DGPU -c ./src/cuda.c -o obj/cuda.o
gcc -Iinclude/ -Isrc/ -DOPENCV `pkg-config --cflags opencv4`  -DGPU -I/usr/local/cuda/include/ -Wall -Wno-unused-result -Wno-unknown-pragmas -Wfatal-errors -fPIC -Ofast -DOPENCV -DGPU -c ./src/deconvolutional_layer.c -o obj/deconvolutional_layer.o
gcc -Iinclude/ -Isrc/ -DOPENCV `pkg-config --cflags opencv4`  -DGPU -I/usr/local/cuda/include/ -Wall -Wno-unused-result -Wno-unknown-pragmas -Wfatal-errors -fPIC -Ofast -DOPENCV -DGPU -c ./src/convolutional_layer.c -o obj/convolutional_layer.o
gcc -Iinclude/ -Isrc/ -DOPENCV `pkg-config --cflags opencv4`  -DGPU -I/usr/local/cuda/include/ -Wall -Wno-unused-result -Wno-unknown-pragmas -Wfatal-errors -fPIC -Ofast -DOPENCV -DGPU -c ./src/list.c -o obj/list.o
gcc -Iinclude/ -Isrc/ -DOPENCV `pkg-config --cflags opencv4`  -DGPU -I/usr/local/cuda/include/ -Wall -Wno-unused-result -Wno-unknown-pragmas -Wfatal-errors -fPIC -Ofast -DOPENCV -DGPU -c ./src/image.c -o obj/image.o
gcc -Iinclude/ -Isrc/ -DOPENCV `pkg-config --cflags opencv4`  -DGPU -I/usr/local/cuda/include/ -Wall -Wno-unused-result -Wno-unknown-pragmas -Wfatal-errors -fPIC -Ofast -DOPENCV -DGPU -c ./src/activations.c -o obj/activations.o
gcc -Iinclude/ -Isrc/ -DOPENCV `pkg-config --cflags opencv4`  -DGPU -I/usr/local/cuda/include/ -Wall -Wno-unused-result -Wno-unknown-pragmas -Wfatal-errors -fPIC -Ofast -DOPENCV -DGPU -c ./src/im2col.c -o obj/im2col.o
gcc -Iinclude/ -Isrc/ -DOPENCV `pkg-config --cflags opencv4`  -DGPU -I/usr/local/cuda/include/ -Wall -Wno-unused-result -Wno-unknown-pragmas -Wfatal-errors -fPIC -Ofast -DOPENCV -DGPU -c ./src/col2im.c -o obj/col2im.o
gcc -Iinclude/ -Isrc/ -DOPENCV `pkg-config --cflags opencv4`  -DGPU -I/usr/local/cuda/include/ -Wall -Wno-unused-result -Wno-unknown-pragmas -Wfatal-errors -fPIC -Ofast -DOPENCV -DGPU -c ./src/blas.c -o obj/blas.o
gcc -Iinclude/ -Isrc/ -DOPENCV `pkg-config --cflags opencv4`  -DGPU -I/usr/local/cuda/include/ -Wall -Wno-unused-result -Wno-unknown-pragmas -Wfatal-errors -fPIC -Ofast -DOPENCV -DGPU -c ./src/crop_layer.c -o obj/crop_layer.o
gcc -Iinclude/ -Isrc/ -DOPENCV `pkg-config --cflags opencv4`  -DGPU -I/usr/local/cuda/include/ -Wall -Wno-unused-result -Wno-unknown-pragmas -Wfatal-errors -fPIC -Ofast -DOPENCV -DGPU -c ./src/dropout_layer.c -o obj/dropout_layer.o
gcc -Iinclude/ -Isrc/ -DOPENCV `pkg-config --cflags opencv4`  -DGPU -I/usr/local/cuda/include/ -Wall -Wno-unused-result -Wno-unknown-pragmas -Wfatal-errors -fPIC -Ofast -DOPENCV -DGPU -c ./src/maxpool_layer.c -o obj/maxpool_layer.o
gcc -Iinclude/ -Isrc/ -DOPENCV `pkg-config --cflags opencv4`  -DGPU -I/usr/local/cuda/include/ -Wall -Wno-unused-result -Wno-unknown-pragmas -Wfatal-errors -fPIC -Ofast -DOPENCV -DGPU -c ./src/softmax_layer.c -o obj/softmax_layer.o
gcc -Iinclude/ -Isrc/ -DOPENCV `pkg-config --cflags opencv4`  -DGPU -I/usr/local/cuda/include/ -Wall -Wno-unused-result -Wno-unknown-pragmas -Wfatal-errors -fPIC -Ofast -DOPENCV -DGPU -c ./src/data.c -o obj/data.o
gcc -Iinclude/ -Isrc/ -DOPENCV `pkg-config --cflags opencv4`  -DGPU -I/usr/local/cuda/include/ -Wall -Wno-unused-result -Wno-unknown-pragmas -Wfatal-errors -fPIC -Ofast -DOPENCV -DGPU -c ./src/matrix.c -o obj/matrix.o
gcc -Iinclude/ -Isrc/ -DOPENCV `pkg-config --cflags opencv4`  -DGPU -I/usr/local/cuda/include/ -Wall -Wno-unused-result -Wno-unknown-pragmas -Wfatal-errors -fPIC -Ofast -DOPENCV -DGPU -c ./src/network.c -o obj/network.o
gcc -Iinclude/ -Isrc/ -DOPENCV `pkg-config --cflags opencv4`  -DGPU -I/usr/local/cuda/include/ -Wall -Wno-unused-result -Wno-unknown-pragmas -Wfatal-errors -fPIC -Ofast -DOPENCV -DGPU -c ./src/connected_layer.c -o obj/connected_layer.o
gcc -Iinclude/ -Isrc/ -DOPENCV `pkg-config --cflags opencv4`  -DGPU -I/usr/local/cuda/include/ -Wall -Wno-unused-result -Wno-unknown-pragmas -Wfatal-errors -fPIC -Ofast -DOPENCV -DGPU -c ./src/cost_layer.c -o obj/cost_layer.o
gcc -Iinclude/ -Isrc/ -DOPENCV `pkg-config --cflags opencv4`  -DGPU -I/usr/local/cuda/include/ -Wall -Wno-unused-result -Wno-unknown-pragmas -Wfatal-errors -fPIC -Ofast -DOPENCV -DGPU -c ./src/parser.c -o obj/parser.o
gcc -Iinclude/ -Isrc/ -DOPENCV `pkg-config --cflags opencv4`  -DGPU -I/usr/local/cuda/include/ -Wall -Wno-unused-result -Wno-unknown-pragmas -Wfatal-errors -fPIC -Ofast -DOPENCV -DGPU -c ./src/option_list.c -o obj/option_list.o
gcc -Iinclude/ -Isrc/ -DOPENCV `pkg-config --cflags opencv4`  -DGPU -I/usr/local/cuda/include/ -Wall -Wno-unused-result -Wno-unknown-pragmas -Wfatal-errors -fPIC -Ofast -DOPENCV -DGPU -c ./src/detection_layer.c -o obj/detection_layer.o
gcc -Iinclude/ -Isrc/ -DOPENCV `pkg-config --cflags opencv4`  -DGPU -I/usr/local/cuda/include/ -Wall -Wno-unused-result -Wno-unknown-pragmas -Wfatal-errors -fPIC -Ofast -DOPENCV -DGPU -c ./src/route_layer.c -o obj/route_layer.o
gcc -Iinclude/ -Isrc/ -DOPENCV `pkg-config --cflags opencv4`  -DGPU -I/usr/local/cuda/include/ -Wall -Wno-unused-result -Wno-unknown-pragmas -Wfatal-errors -fPIC -Ofast -DOPENCV -DGPU -c ./src/upsample_layer.c -o obj/upsample_layer.o
gcc -Iinclude/ -Isrc/ -DOPENCV `pkg-config --cflags opencv4`  -DGPU -I/usr/local/cuda/include/ -Wall -Wno-unused-result -Wno-unknown-pragmas -Wfatal-errors -fPIC -Ofast -DOPENCV -DGPU -c ./src/box.c -o obj/box.o
gcc -Iinclude/ -Isrc/ -DOPENCV `pkg-config --cflags opencv4`  -DGPU -I/usr/local/cuda/include/ -Wall -Wno-unused-result -Wno-unknown-pragmas -Wfatal-errors -fPIC -Ofast -DOPENCV -DGPU -c ./src/normalization_layer.c -o obj/normalization_layer.o
gcc -Iinclude/ -Isrc/ -DOPENCV `pkg-config --cflags opencv4`  -DGPU -I/usr/local/cuda/include/ -Wall -Wno-unused-result -Wno-unknown-pragmas -Wfatal-errors -fPIC -Ofast -DOPENCV -DGPU -c ./src/avgpool_layer.c -o obj/avgpool_layer.o
gcc -Iinclude/ -Isrc/ -DOPENCV `pkg-config --cflags opencv4`  -DGPU -I/usr/local/cuda/include/ -Wall -Wno-unused-result -Wno-unknown-pragmas -Wfatal-errors -fPIC -Ofast -DOPENCV -DGPU -c ./src/layer.c -o obj/layer.o
gcc -Iinclude/ -Isrc/ -DOPENCV `pkg-config --cflags opencv4`  -DGPU -I/usr/local/cuda/include/ -Wall -Wno-unused-result -Wno-unknown-pragmas -Wfatal-errors -fPIC -Ofast -DOPENCV -DGPU -c ./src/local_layer.c -o obj/local_layer.o
gcc -Iinclude/ -Isrc/ -DOPENCV `pkg-config --cflags opencv4`  -DGPU -I/usr/local/cuda/include/ -Wall -Wno-unused-result -Wno-unknown-pragmas -Wfatal-errors -fPIC -Ofast -DOPENCV -DGPU -c ./src/shortcut_layer.c -o obj/shortcut_layer.o
gcc -Iinclude/ -Isrc/ -DOPENCV `pkg-config --cflags opencv4`  -DGPU -I/usr/local/cuda/include/ -Wall -Wno-unused-result -Wno-unknown-pragmas -Wfatal-errors -fPIC -Ofast -DOPENCV -DGPU -c ./src/logistic_layer.c -o obj/logistic_layer.o
gcc -Iinclude/ -Isrc/ -DOPENCV `pkg-config --cflags opencv4`  -DGPU -I/usr/local/cuda/include/ -Wall -Wno-unused-result -Wno-unknown-pragmas -Wfatal-errors -fPIC -Ofast -DOPENCV -DGPU -c ./src/activation_layer.c -o obj/activation_layer.o
gcc -Iinclude/ -Isrc/ -DOPENCV `pkg-config --cflags opencv4`  -DGPU -I/usr/local/cuda/include/ -Wall -Wno-unused-result -Wno-unknown-pragmas -Wfatal-errors -fPIC -Ofast -DOPENCV -DGPU -c ./src/rnn_layer.c -o obj/rnn_layer.o
gcc -Iinclude/ -Isrc/ -DOPENCV `pkg-config --cflags opencv4`  -DGPU -I/usr/local/cuda/include/ -Wall -Wno-unused-result -Wno-unknown-pragmas -Wfatal-errors -fPIC -Ofast -DOPENCV -DGPU -c ./src/gru_layer.c -o obj/gru_layer.o
gcc -Iinclude/ -Isrc/ -DOPENCV `pkg-config --cflags opencv4`  -DGPU -I/usr/local/cuda/include/ -Wall -Wno-unused-result -Wno-unknown-pragmas -Wfatal-errors -fPIC -Ofast -DOPENCV -DGPU -c ./src/crnn_layer.c -o obj/crnn_layer.o
gcc -Iinclude/ -Isrc/ -DOPENCV `pkg-config --cflags opencv4`  -DGPU -I/usr/local/cuda/include/ -Wall -Wno-unused-result -Wno-unknown-pragmas -Wfatal-errors -fPIC -Ofast -DOPENCV -DGPU -c ./src/demo.c -o obj/demo.o
gcc -Iinclude/ -Isrc/ -DOPENCV `pkg-config --cflags opencv4`  -DGPU -I/usr/local/cuda/include/ -Wall -Wno-unused-result -Wno-unknown-pragmas -Wfatal-errors -fPIC -Ofast -DOPENCV -DGPU -c ./src/batchnorm_layer.c -o obj/batchnorm_layer.o
gcc -Iinclude/ -Isrc/ -DOPENCV `pkg-config --cflags opencv4`  -DGPU -I/usr/local/cuda/include/ -Wall -Wno-unused-result -Wno-unknown-pragmas -Wfatal-errors -fPIC -Ofast -DOPENCV -DGPU -c ./src/region_layer.c -o obj/region_layer.o
gcc -Iinclude/ -Isrc/ -DOPENCV `pkg-config --cflags opencv4`  -DGPU -I/usr/local/cuda/include/ -Wall -Wno-unused-result -Wno-unknown-pragmas -Wfatal-errors -fPIC -Ofast -DOPENCV -DGPU -c ./src/reorg_layer.c -o obj/reorg_layer.o
gcc -Iinclude/ -Isrc/ -DOPENCV `pkg-config --cflags opencv4`  -DGPU -I/usr/local/cuda/include/ -Wall -Wno-unused-result -Wno-unknown-pragmas -Wfatal-errors -fPIC -Ofast -DOPENCV -DGPU -c ./src/tree.c -o obj/tree.o
gcc -Iinclude/ -Isrc/ -DOPENCV `pkg-config --cflags opencv4`  -DGPU -I/usr/local/cuda/include/ -Wall -Wno-unused-result -Wno-unknown-pragmas -Wfatal-errors -fPIC -Ofast -DOPENCV -DGPU -c ./src/lstm_layer.c -o obj/lstm_layer.o
gcc -Iinclude/ -Isrc/ -DOPENCV `pkg-config --cflags opencv4`  -DGPU -I/usr/local/cuda/include/ -Wall -Wno-unused-result -Wno-unknown-pragmas -Wfatal-errors -fPIC -Ofast -DOPENCV -DGPU -c ./src/l2norm_layer.c -o obj/l2norm_layer.o
gcc -Iinclude/ -Isrc/ -DOPENCV `pkg-config --cflags opencv4`  -DGPU -I/usr/local/cuda/include/ -Wall -Wno-unused-result -Wno-unknown-pragmas -Wfatal-errors -fPIC -Ofast -DOPENCV -DGPU -c ./src/yolo_layer.c -o obj/yolo_layer.o
gcc -Iinclude/ -Isrc/ -DOPENCV `pkg-config --cflags opencv4`  -DGPU -I/usr/local/cuda/include/ -Wall -Wno-unused-result -Wno-unknown-pragmas -Wfatal-errors -fPIC -Ofast -DOPENCV -DGPU -c ./src/iseg_layer.c -o obj/iseg_layer.o
g++ -Iinclude/ -Isrc/ -DOPENCV `pkg-config --cflags opencv4`  -DGPU -I/usr/local/cuda/include/ -Wall -Wno-unused-result -Wno-unknown-pragmas -Wfatal-errors -fPIC -Ofast -DOPENCV -DGPU -c ./src/image_opencv.cpp -o obj/image_opencv.o
In file included from /usr/local/include/opencv4/opencv2/core.hpp:52:0,
                 from /usr/local/include/opencv4/opencv2/opencv.hpp:52,
                 from ./src/image_opencv.cpp:5:
/usr/local/include/opencv4/opencv2/core/cvdef.h:690:4: error: #error "OpenCV 4.x+ requires enabled C++11 support"
 #  error "OpenCV 4.x+ requires enabled C++11 support"
    ^
compilation terminated due to -Wfatal-errors.
Makefile:86: recipe for target 'obj/image_opencv.o' failed
make: *** [obj/image_opencv.o] Error 1

@Liedermaus
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As I tested most of them, I suggest to use 3.4.0.
Also I try cmake-gui, there you you will see ALL settings not only the smal subset you described above.

@1vash
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1vash commented Sep 11, 2019 •
edited
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@Liedermaus Thanks a lot for the help. I'm already compiling with 3.4.0. But it would be great to make 4.1.1 working with darknet. Trackers and things that are going to be added in the future OpenCV releases would be great to have compatible with GPU Yolo

@Liedermaus
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The problem is, that Yolo uses a C-Interface and (theoretically) beginning of 4.x OpenCV only does support c++. Theoretically because beginning with 3.4.1 the C-interface is still there, but it is not working correctly anymore.
I looked through the code and there is no easy fix on the side of OpenCV, sry...

@mmeiborg mmeiborg mentioned this issue Mar 8, 2020
Open
@stevenlee090 stevenlee090 mentioned this issue Mar 10, 2020
Closed
@AntonioRamalho96
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I managed to use darknet with opencv4 by using a branch of darknet, present in this answer: issue

@ghost
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ghost commented Aug 5, 2021

@AntonioRamalho96 your solution is incorrect. I still get the same error when I run make

gcc -Iinclude/ -Isrc/ -DOPENCV `pkg-config --cflags opencv 2> /dev/null || pkg-config --cflags opencv4` -DNUMPY -I/usr/include/python3.8/ -I/usr/lib/python3.8/numpy/ -DGPU -I/usr/local/cuda/include/ -DCUDNN  -Wall -Wno-unknown-pragmas -Wfatal-errors -fPIC -fopenmp -Ofast -DOPENCV -DNUMPY -DGPU -DCUDNN -c ./src/gemm.c -o obj/gemm.o
In file included from /usr/local/include/opencv4/opencv2/core/types_c.h:84:0,
                 from /usr/local/include/opencv4/opencv2/core/core_c.h:48,
                 from /usr/local/include/opencv4/opencv2/highgui/highgui_c.h:45,
                 from include/darknet.h:25,
                 from ./src/utils.h:5,
                 from ./src/gemm.c:2:
/usr/local/include/opencv4/opencv2/core/cvdef.h:740:4: error: #error "OpenCV 4.x+ requires enabled C++11 support"
 #  error "OpenCV 4.x+ requires enabled C++11 support"
    ^~~~~
compilation terminated due to -Wfatal-errors.
make: *** [Makefile:92: obj/gemm.o] Error 1

My makefile:

GPU=1
CUDNN=1
OPENCV=1
OPENMP=1
NUMPY=1
DEBUG=0

ARCH= -gencode arch=compute_30,code=sm_30 \
      -gencode arch=compute_35,code=sm_35 \
      -gencode arch=compute_50,code=[sm_50,compute_50] \
      -gencode arch=compute_52,code=[sm_52,compute_52]
#      -gencode arch=compute_20,code=[sm_20,sm_21] \ This one is deprecated?

# This is what I use, uncomment if you know your arch and want to specify
ARCH= -gencode arch=compute_75,code=compute_75

VPATH=./src/:./examples
SLIB=libdarknet.so
ALIB=libdarknet.a
EXEC=darknet
OBJDIR=./obj/

CC=gcc
CPP=g++ -std=c++11
NVCC=nvcc 
AR=ar
ARFLAGS=rcs
OPTS=-Ofast
LDFLAGS= -lm -pthread 
COMMON= -Iinclude/ -Isrc/
CFLAGS=-Wall -Wno-unknown-pragmas -Wfatal-errors -fPIC

ifeq ($(OPENMP), 1) 
CFLAGS+= -fopenmp
endif

ifeq ($(DEBUG), 1) 
OPTS=-O0 -g
endif

CFLAGS+=$(OPTS)

ifeq ($(OPENCV), 1) 
COMMON+= -DOPENCV
CFLAGS+= -DOPENCV
LDFLAGS+= `pkg-config --libs opencv 2> /dev/null || pkg-config --libs opencv4` -lstdc++
COMMON+= `pkg-config --cflags opencv 2> /dev/null || pkg-config --cflags opencv4`
endif

ifeq ($(NUMPY), 1) 
COMMON+= -DNUMPY -I/usr/include/python3.8/ -I/usr/lib/python3.8/numpy/
CFLAGS+= -DNUMPY
endif

ifeq ($(GPU), 1) 
COMMON+= -DGPU -I/usr/local/cuda/include/
CFLAGS+= -DGPU
LDFLAGS+= -L/usr/local/cuda/lib64 -lcuda -lcudart -lcublas -lcurand
endif

ifeq ($(CUDNN), 1) 
COMMON+= -DCUDNN 
CFLAGS+= -DCUDNN
LDFLAGS+= -lcudnn
endif

OBJ=gemm.o utils.o cuda.o deconvolutional_layer.o convolutional_layer.o list.o image.o activations.o im2col.o col2im.o blas.o crop_layer.o dropout_layer.o maxpool_layer.o softmax_layer.o data.o matrix.o network.o connected_layer.o cost_layer.o parser.o option_list.o detection_layer.o route_layer.o box.o normalization_layer.o avgpool_layer.o layer.o local_layer.o shortcut_layer.o activation_layer.o rnn_layer.o gru_layer.o crnn_layer.o demo.o batchnorm_layer.o region_layer.o reorg_layer.o tree.o  lstm_layer.o
EXECOBJA=captcha.o lsd.o super.o art.o tag.o cifar.o go.o rnn.o segmenter.o regressor.o classifier.o coco.o yolo.o detector.o nightmare.o attention.o darknet.o
ifeq ($(GPU), 1) 
LDFLAGS+= -lstdc++ 
OBJ+=convolutional_kernels.o deconvolutional_kernels.o activation_kernels.o im2col_kernels.o col2im_kernels.o blas_kernels.o crop_layer_kernels.o dropout_layer_kernels.o maxpool_layer_kernels.o avgpool_layer_kernels.o
endif

EXECOBJ = $(addprefix $(OBJDIR), $(EXECOBJA))
OBJS = $(addprefix $(OBJDIR), $(OBJ))
DEPS = $(wildcard src/*.h) Makefile include/darknet.h

#all: obj backup results $(SLIB) $(ALIB) $(EXEC)
all: obj  results $(SLIB) $(ALIB) $(EXEC)


$(EXEC): $(EXECOBJ) $(ALIB)
	$(CC) $(COMMON) $(CFLAGS) $^ -o $@ $(LDFLAGS) $(ALIB)

$(ALIB): $(OBJS)
	$(AR) $(ARFLAGS) $@ $^

$(SLIB): $(OBJS)
	$(CC) $(CFLAGS) -shared $^ -o $@ $(LDFLAGS)

$(OBJDIR)%.o: %.c $(DEPS)
	$(CC) $(COMMON) $(CFLAGS) -c $< -o $@

$(OBJDIR)%.o: %.cu $(DEPS)
	$(NVCC) $(ARCH) $(COMMON) --compiler-options "$(CFLAGS)" -c $< -o $@

obj:
	mkdir -p obj
backup:
	mkdir -p backup
results:
	mkdir -p results

.PHONY: clean

clean:
	rm -rf $(OBJS) $(SLIB) $(ALIB) $(EXEC) $(EXECOBJ)

OBJDIR=./obj/

CC=gcc
CPP=g++ -std=c++11
NVCC=nvcc 
AR=ar
ARFLAGS=rcs
OPTS=-Ofast
LDFLAGS= -lm -pthread 
COMMON= -Iinclude/ -Isrc/
CFLAGS=-Wall -Wno-unknown-pragmas -Wfatal-errors -fPIC

ifeq ($(OPENMP), 1) 
CFLAGS+= -fopenmp
endif

ifeq ($(DEBUG), 1) 
OPTS=-O0 -g
endif

CFLAGS+=$(OPTS)

ifeq ($(OPENCV), 1) 
COMMON+= -DOPENCV
CFLAGS+= -DOPENCV
LDFLAGS+= `pkg-config --libs opencv 2> /dev/null || pkg-config --libs opencv4` -lstdc++
COMMON+= `pkg-config --cflags opencv 2> /dev/null || pkg-config --cflags opencv4`
endif

ifeq ($(NUMPY), 1) 
COMMON+= -DNUMPY -I/usr/include/python3.8/ -I/usr/lib/python3.8/numpy/
CFLAGS+= -DNUMPY
endif

ifeq ($(GPU), 1) 
COMMON+= -DGPU -I/usr/local/cuda/include/
CFLAGS+= -DGPU
LDFLAGS+= -L/usr/local/cuda/lib64 -lcuda -lcudart -lcublas -lcurand
endif

ifeq ($(CUDNN), 1) 
COMMON+= -DCUDNN 
CFLAGS+= -DCUDNN
LDFLAGS+= -lcudnn
endif

OBJ=gemm.o utils.o cuda.o deconvolutional_layer.o convolutional_layer.o list.o image.o activations.o im2col.o col2im.o blas.o crop_layer.o dropout_layer.o maxpool_layer.o softmax_layer.o data.o matrix.o network.o connected_layer.o cost_layer.o parser.o option_list.o detection_layer.o route_layer.o box.o normalization_layer.o avgpool_layer.o layer.o local_layer.o shortcut_layer.o activation_layer.o rnn_layer.o gru_layer.o crnn_layer.o demo.o batchnorm_layer.o region_layer.o reorg_layer.o tree.o  lstm_layer.o
EXECOBJA=captcha.o lsd.o super.o art.o tag.o cifar.o go.o rnn.o segmenter.o regressor.o classifier.o coco.o yolo.o detector.o nightmare.o attention.o darknet.o
ifeq ($(GPU), 1) 
LDFLAGS+= -lstdc++ 
OBJ+=convolutional_kernels.o deconvolutional_kernels.o activation_kernels.o im2col_kernels.o col2im_kernels.o blas_kernels.o crop_layer_kernels.o dropout_layer_kernels.o maxpool_layer_kernels.o avgpool_layer_kernels.o
endif

EXECOBJ = $(addprefix $(OBJDIR), $(EXECOBJA))
OBJS = $(addprefix $(OBJDIR), $(OBJ))
DEPS = $(wildcard src/*.h) Makefile include/darknet.h

#all: obj backup results $(SLIB) $(ALIB) $(EXEC)
all: obj  results $(SLIB) $(ALIB) $(EXEC)


$(EXEC): $(EXECOBJ) $(ALIB)
	$(CC) $(COMMON) $(CFLAGS) $^ -o $@ $(LDFLAGS) $(ALIB)

$(ALIB): $(OBJS)
	$(AR) $(ARFLAGS) $@ $^

$(SLIB): $(OBJS)
	$(CC) $(CFLAGS) -shared $^ -o $@ $(LDFLAGS)

$(OBJDIR)%.o: %.c $(DEPS)
	$(CC) $(COMMON) $(CFLAGS) -c $< -o $@

$(OBJDIR)%.o: %.cu $(DEPS)
	$(NVCC) $(ARCH) $(COMMON) --compiler-options "$(CFLAGS)" -c $< -o $@

obj:
	mkdir -p obj
backup:
	mkdir -p backup
results:
	mkdir -p results

.PHONY: clean

clean:
	rm -rf $(OBJS) $(SLIB) $(ALIB) $(EXEC) $(EXECOBJ)

@nikhilkhandelwal0702
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@iAmJuan550 did you resolve this issue.
I am also facing the same issue with opencv4

@sarimmehdi
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sarimmehdi commented Sep 1, 2021 •
edited
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Hi everyone, please use this forked version of darknet instead of this one. It is currently maintained and supports the latest version of everything.

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@hobbes3 @Liedermaus @1vash @sarimmehdi @AntonioRamalho96 @nikhilkhandelwal0702