GolangGoCV
  • Ubuntu 18.04.5 LTS
  • Golang 1.15.6
  • OpenCV 4.5.0
  • GoCV 0.2.5
1. Golang环境准备

1.1 安装Golang

PATH

1.2 设置GOPATH

go get$GOPATH/home/ubuntu/.go~/go
1cd /home/ubuntu/.go
2export GOPATH=/home/ubuntu/.go

1.3 下载GoCV源码

1# 设置代理翻墙，要不然下载不了
2git config --global http.proxy=http://127.0.0.1:12346
3git config --global https.proxy=http://127.0.0.1:12346
4export http_proxy=http://127.0.0.1:12346
5export https_proxy=http://127.0.0.1:12346
6go get -v -u -d gocv.io/x/gocv
2. 开始编译

在GoCV的源码中，有一个Makefile文件，使用该Makefile可以简化OpenCV的编译过程。我是以此文件为基础编译的。

2.1 安装依赖库

1# 切换到源码目录
2ubuntu@testserver:~$ cd $GOPATH/src/gocv.io/x/gocv
3# 安装依赖库
4ubuntu@testserver:~/.go/src/gocv.io/x/gocv$ make deps
5sudo apt-get -y update
6sudo apt-get -y install unzip wget build-essential cmake curl git libgtk2.0-dev pkg-config libavcodec-dev libavformat-dev libswscale-dev libtbb2 libtbb-dev libjpeg-dev libpng-dev libtiff-dev libdc1394-22-dev

2.2 下载相关源码

OpenCV
 1ubuntu@testserver:~/.go/src/gocv.io/x/gocv$ make download
 2rm -rf /tmp/opencv
 3mkdir /tmp/opencv
 4cd /tmp/opencv
 5curl -Lo opencv.zip https://github.com/opencv/opencv/archive/4.5.0.zip
 6unzip -q opencv.zip
 7curl -Lo opencv_contrib.zip https://github.com/opencv/opencv_contrib/archive/4.5.0.zip
 8unzip -q opencv_contrib.zip
 9rm opencv.zip opencv_contrib.zip
10cd -

2.3 编译

MakefileFFMpegGTKDC1394$GOPATH/src/gocv.io/x/gocv/Makefile-D WITH_FFMPEG=OFF -D WITH_GTK=OFF -D WITH_1394=OFF -D WITH_TIFF=OFFbuildcmake
 1# Build OpenCV.
 2build:
 3        cd $(TMP_DIR)opencv/opencv-$(OPENCV_VERSION)
 4        mkdir build
 5        cd build
 6        rm -rf *
 7        #cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D BUILD_SHARED_LIBS=${BUILD_SHARED_LIBS} -D OPENCV_EXTRA_MODULES_PATH=$(TMP_DIR)opencv/opencv_contrib-$(OPENCV_VERSION)/modules -D BUILD_DOCS=OFF -D BUILD_EXAMPLES=OFF -D BUILD_TESTS=OFF -D BUILD_PERF_TESTS=OFF -D BUILD_opencv_java=NO -D BUILD_opencv_python=NO -D BUILD_opencv_python2=NO -D BUILD_opencv_python3=NO -D WITH_JASPER=OFF -DOPENCV_GENERATE_PKGCONFIG=ON ..
 8        cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D BUILD_SHARED_LIBS=${BUILD_SHARED_LIBS} -D OPENCV_EXTRA_MODULES_PATH=$(TMP_DIR)opencv/opencv_contrib-$(OPENCV_VERSION)/modules -D BUILD_DOCS=OFF -D BUILD_EXAMPLES=OFF -D BUILD_TESTS=OFF -D BUILD_PERF_TESTS=OFF -D BUILD_opencv_java=NO -D BUILD_opencv_python=NO -D BUILD_opencv_python2=NO -D BUILD_opencv_python3=NO -D WITH_JASPER=OFF -D WITH_FFMPEG=OFF -D WITH_GTK=OFF -D WITH_1394=OFF -DOPENCV_GENERATE_PKGCONFIG=ON ..
 9        $(MAKE) -j $(shell nproc --all)
10        $(MAKE) preinstall
11        cd -

WITH_TIFF=OFFCGO_LDFLAGS

然后可以执行编译了。这个编译耗费时间会比较长。我这边花了20+分钟。

1# 默认方式编译，编译出来动态库。我不用这种方式。
2ubuntu@testserver:~/.go/src/gocv.io/x/gocv$ make build
3#  我要编译静态库，所以添加BUILD_SHARED_LIBS=OFF
4ubuntu@testserver:~/.go/src/gocv.io/x/gocv$ make build BUILD_SHARED_LIBS=OFF

漫长的等待。

2.4 安装

1# 将编译好的库安装到系统中
2ubuntu@testserver:~/.go/src/gocv.io/x/gocv$ make sudo_install
3cd /tmp/opencv/opencv-4.5.0/build
4sudo make install
5sudo ldconfig
6cd -
7[sudo] password for ubuntu:
2.5 编译Golang程序 
CGO_CPPFLAGSCGO_LDFLAGSgo build -tags customenv
CGO_CPPFLAGSpkg-config --cflagsCGO_LDFLAGSpkg-config --libs
1# 使用`pkg-config --cflags opencv4`获得
2export CGO_CPPFLAGS="-I/usr/local/include/opencv4"
3# 使用`pkg-config --libs --static opencv4`获得主要内容。然后添加上`--static`这个参数。
4export CGO_LDFLAGS="--static -L/usr/local/lib -L/usr/local/lib/opencv4/3rdparty -L/tmp/opencv/opencv-4.5.0/build/lib -lopencv_gapi -lopencv_stitching -lopencv_aruco -lopencv_bgsegm -lopencv_bioinspired -lopencv_ccalib -lopencv_dnn_objdetect -lopencv_dnn_superres -lopencv_dpm -lopencv_highgui -lopencv_face -lopencv_freetype -lopencv_fuzzy -lopencv_hfs -lopencv_img_hash -lopencv_intensity_transform -lopencv_line_descriptor -lopencv_mcc -lopencv_quality -lopencv_rapid -lopencv_reg -lopencv_rgbd -lopencv_saliency -lopencv_stereo -lopencv_structured_light -lopencv_phase_unwrapping -lopencv_superres -lopencv_optflow -lopencv_surface_matching -lopencv_tracking -lopencv_datasets -lopencv_text -lopencv_dnn -lopencv_plot -lopencv_videostab -lopencv_videoio -lopencv_xfeatures2d -lopencv_shape -lopencv_ml -lopencv_ximgproc -lopencv_video -lopencv_xobjdetect -lopencv_objdetect -lopencv_calib3d -lopencv_imgcodecs -lopencv_features2d -lopencv_flann -lopencv_xphoto -lopencv_photo -lopencv_imgproc -lopencv_core -littnotify -llibprotobuf -llibwebp -llibopenjp2 -lIlmImf -lquirc -lippiw -lippicv -lade -ljpeg -lpng -lz -ltiff -lfreetype -lharfbuzz -ljbig -llzma -lm -lpthread -lrt -lc -ldl"

TIFFMakefileWITH_TIFF=OFFCPP_LDFLAGS-ljbig -llzma
go build -v -tags customenv .
3. 编译中碰到的一些错误 
undefined reference to

3.1 jbg

1(.text+0x45): undefined reference to `jbg_enc_init'
2(.text+0x4d): undefined reference to `jbg_enc_out'
3(.text+0x55): undefined reference to `jbg_enc_free'

libjbig-ljbig

3.2 lzma

1(.text+0x1a0): undefined reference to `lzma_code'

liblzma-llzma

3.3 dlopen、getaddrinfo

1warning: Using 'dlopen' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking

libc

1Using 'getaddrinfo' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking

这两个警告信息暂时找不到解决办法。

4. 其他一些CGO编译相关的指令 
go clean -cache
附录、参考资料