在Go项目gocv中使用ARM交叉编译的OpenCV

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我在主机 ubuntu 20.04.3 lts 下编译了适用于 arm 的 opencv 和 gocv，步骤如下。

1。 apt安装arm-linux-gnueabi-gcc、arm-linux-gnueabi-g++

2。编译安装opencv

cmake -dcmake_c_compiler=arm-linux-gnueabi-gcc -dcmake_cxx_compiler=arm-linux-gnueabi-g++  -dcmake_toolchain_file=../opencv/platforms/linux/arm-gnueabi.toolchain.cmake  ../opencv
make -j16
make install

安装后。在当前目录中创建了一个名为 install 的文件夹，并获得了共享库，如下所示。

../arm2build/install/lib
|-- cmake
|   `-- opencv4
|       |-- opencvconfig-version.cmake
|       |-- opencvconfig.cmake
|       |-- opencvmodules-release.cmake
|       `-- opencvmodules.cmake
|-- libopencv_calib3d.so -> libopencv_calib3d.so.405
|-- libopencv_calib3d.so.4.5.4
|-- libopencv_calib3d.so.405 -> libopencv_calib3d.so.4.5.4
|-- libopencv_core.so -> libopencv_core.so.405
|-- libopencv_core.so.4.5.4
|-- libopencv_core.so.405 -> libopencv_core.so.4.5.4
|-- libopencv_dnn.so -> libopencv_dnn.so.405
|-- libopencv_dnn.so.4.5.4
|-- libopencv_dnn.so.405 -> libopencv_dnn.so.4.5.4
|-- libopencv_features2d.so -> libopencv_features2d.so.405
|-- libopencv_features2d.so.4.5.4
|-- libopencv_features2d.so.405 -> libopencv_features2d.so.4.5.4
|-- libopencv_flann.so -> libopencv_flann.so.405
|-- libopencv_flann.so.4.5.4
|-- libopencv_flann.so.405 -> libopencv_flann.so.4.5.4
|-- libopencv_gapi.so -> libopencv_gapi.so.405
|-- libopencv_gapi.so.4.5.4
|-- libopencv_gapi.so.405 -> libopencv_gapi.so.4.5.4
|-- libopencv_highgui.so -> libopencv_highgui.so.405
|-- libopencv_highgui.so.4.5.4
|-- libopencv_highgui.so.405 -> libopencv_highgui.so.4.5.4
|-- libopencv_imgcodecs.so -> libopencv_imgcodecs.so.405
|-- libopencv_imgcodecs.so.4.5.4
|-- libopencv_imgcodecs.so.405 -> libopencv_imgcodecs.so.4.5.4
|-- libopencv_imgproc.so -> libopencv_imgproc.so.405
|-- libopencv_imgproc.so.4.5.4
|-- libopencv_imgproc.so.405 -> libopencv_imgproc.so.4.5.4
|-- libopencv_ml.so -> libopencv_ml.so.405
|-- libopencv_ml.so.4.5.4
|-- libopencv_ml.so.405 -> libopencv_ml.so.4.5.4
|-- libopencv_objdetect.so -> libopencv_objdetect.so.405
|-- libopencv_objdetect.so.4.5.4
|-- libopencv_objdetect.so.405 -> libopencv_objdetect.so.4.5.4
|-- libopencv_photo.so -> libopencv_photo.so.405
|-- libopencv_photo.so.4.5.4
|-- libopencv_photo.so.405 -> libopencv_photo.so.4.5.4
|-- libopencv_stitching.so -> libopencv_stitching.so.405
|-- libopencv_stitching.so.4.5.4
|-- libopencv_stitching.so.405 -> libopencv_stitching.so.4.5.4
|-- libopencv_video.so -> libopencv_video.so.405
|-- libopencv_video.so.4.5.4
|-- libopencv_video.so.405 -> libopencv_video.so.4.5.4
|-- libopencv_videoio.so -> libopencv_videoio.so.405
|-- libopencv_videoio.so.4.5.4
`-- libopencv_videoio.so.405 -> libopencv_videoio.so.4.5.4

3。使用cgo构建gocv/cmd/version项目

cgo_enabled=1 cc=arm-linux-gnueabi-gcc cxx=arm-linux-gnueabi-g++ cgo_cppflags='-i/opt/arm2build/install/include/opencv4' cgo_ldflags='-l/opt/arm2build/lib -lopencv_core -lopencv_videoio -lopencv_imgproc -lopencv_highgui -lopencv_imgcodecs -lopencv_objdetect -lopencv_features2d -lopencv_video -lopencv_dnn -lopencv_calib3d -lopencv_flann -lopencv_photo' goos=linux goarch=arm go build -tags=customenv .

这样做之后会生成elf

root@793d7120f9df:/opt/go/gocv/cmd/version# file version
version: elf 32-bit lsb executable, arm, eabi5 version 1 (sysv), dynamically linked, interpreter /lib/ld-linux.so.3, buildid[sha1]=038c80350b7a0c9e72b10021c66c31c2dbb4df2c, for gnu/linux 3.2.0, not stripped

我的问题是如何在带有arm处理器的android中运行elf version？

我将install/libs中的静态库复制到移动设备的/system/lib/。将 version 文件复制到 /data/local/tmp 并授予执行权限。 然后执行 version 得到输出“./version：没有这样的文件或目录”。

130|cactus:/data/local/tmp # ./version
/system/bin/sh: ./version: No such file or directory

正确答案

我发现原因是关于动态链接解释器，而android没有linux平台的解释器。 使用 NDK 重建 opencv 后获得静态库。然后用NDK的clang编译器构建go项目，问题就解决了。

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