技术标签: cmake linux 操作系统 opencv 嵌入式
opencv 3.4.2
opencv_contribute 3.4.2
ubuntu 16
cmake 3.12.2
cmake 进行编译配置
勾选 ENABLE_CXX11
设置安装路径 CMAKE_INSTALL_PREFIX /usr/local
设置 OPENCV_EXTRA_MUDOULES_PATH
opencv-3.4.1/3rdparty/libpng/pngstruct.h:30:18: fatal error: zlib.h: No such file or directory
~/opencv-3.4.2/CMakeLists.txt,大概514行增加以上代码: ocv_include_directories(./3rdparty/zlib/)
......
ocv_include_directories(${OPENCV_CONFIG_FILE_INCLUDE_DIR})
ocv_include_directories(./3rdparty/zlib/)
......
[ 43%] Building CXX object apps/visualisation/CMakeFiles/opencv_visualisation.dir/opencv_visualisation.cpp.obj
[ 43%] Linking CXX executable ../../bin/opencv_annotation
../../lib/libopencv_core.so: undefined reference to `pthread_mutexattr_destroy'
../../lib/libopencv_imgcodecs.so: undefined reference to `pthread_create'
../../lib/libopencv_core.so: undefined reference to `pthread_key_create'
../../lib/libopencv_imgcodecs.so: undefined reference to `png_init_filter_functions_neon'
../../lib/libopencv_core.so: undefined reference to `pthread_getspecific'
../../lib/libopencv_core.so: undefined reference to `dlopen'
../../lib/libopencv_core.so: undefined reference to `pthread_mutex_trylock'
../../lib/libopencv_core.so: undefined reference to `pthread_key_delete'
../../lib/libopencv_core.so: undefined reference to `dlclose'
../../lib/libopencv_core.so: undefined reference to `dlsym'
../../lib/libopencv_core.so: undefined reference to `pthread_mutexattr_settype'
../../lib/libopencv_imgcodecs.so: undefined reference to `pthread_join'
../../lib/libopencv_core.so: undefined reference to `pthread_setspecific'
../../lib/libopencv_core.so: undefined reference to `pthread_mutexattr_init'
collect2: error: ld returned 1 exit status
解决办法1:CMakeCache.txt上约273行,CMAKE_EXE_LINKER_FLAGS和CMAKE_EXE_LINKER_FLAGS_DEBUG,
添加: -lpthread -lrt -ldl
......
//Flags used by the linker.
CMAKE_EXE_LINKER_FLAGS:STRING=-lpthread -lrt -ldl
//Flags used by the linker during debug builds.
CMAKE_EXE_LINKER_FLAGS_DEBUG:STRING=-lpthread -lrt -ldl
......
解决方法2:cmake-gui配置的时候设定,可以参考
[ 43%] Linking CXX executable ../../bin/opencv_annotation
../../lib/libopencv_imgcodecs.so: undefined reference to `png_init_filter_functions_neon'
collect2: error: ld returned 1 exit status
apps/annotation/CMakeFiles/opencv_annotation.dir/build.make:99: recipe for target 'bin/opencv_annotation' failed
make[2]: *** [bin/opencv_annotation] Error 1
CMakeFiles/Makefile2:4431: recipe for target 'apps/annotation/CMakeFiles/opencv_annotation.dir/all' failed
make[1]: *** [apps/annotation/CMakeFiles/opencv_annotation.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....
解决如下:~/opencv-3.4.2/3rdparty/libpng/pngpriv.h
128 /* 注释掉 该行 # if (defined(__ARM_NEON__) || defined(__ARM_NEON)) && \*/
129 # 改为 if defined(PNG_ARM_NEON) && (defined(__ARM_NEON__) || defined(__ARM_NEON)) && \
~/opencv_contrib/modules/xfeatures2d/src/boostdesc.cpp:673:20: fatal error: boostdesc_bgm.i: No such file or directory
解决方法:
查看 build 文件夹下的日志文件 CMakeDownloadLog.txt,在日志文件CMakeDownloadLog.txt中搜索 boostdesc_bgm.i 关键词。日志文件里就有它的下载地址,到指定位置下载即可。https://github.com/opencv/opencv_contrib/issues/1301,点开上面这个网址往下拉,有人提供了缺失的各个文件的链接,点击保存. 或者直接在这个网页里搜索 BenbenIO 这个用户的回答。
或者到本文提供的下载镜像去下载:boostdesc_bgm.i,vgg_generated_48.i等.rar
下载后,直接拷贝源码并生存同名文件,放在 opencv_contrib/modules/xfeatures2d/src/ 路径下即可。
编译时有些文件是联网下载的,所以问题四如果联网下载成功的话,应该就不需要自己去下载以上链接的文件。
见下面的输出:
In file included from /home/john/cross_compile/src/opencv-3.4.2/modules/stitching/include/opencv2/stitching.hpp:49:0,
from /home/john/cross_compile/src/opencv-3.4.2/modules/stitching/src/precomp.hpp:59,
from /home/john/cross_compile/src/opencv-3.4.2/modules/stitching/src/camera.cpp:43:
/home/john/cross_compile/src/opencv-3.4.2/modules/stitching/include/opencv2/stitching/detail/matchers.hpp:52:42: fatal error: opencv2/xfeatures2d/cuda.hpp: No such file or directory
# include "opencv2/xfeatures2d/cuda.hpp"
^
compilation terminated.
modules/stitching/CMakeFiles/opencv_stitching.dir/build.make:68: recipe for target 'modules/stitching/CMakeFiles/opencv_stitching.dir/src/camera.cpp.o' failed
make[2]: *** [modules/stitching/CMakeFiles/opencv_stitching.dir/src/camera.cpp.o] Error 1
CMakeFiles/Makefile2:7779: recipe for target 'modules/stitching/CMakeFiles/opencv_stitching.dir/all' failed
make[1]: *** [modules/stitching/CMakeFiles/opencv_stitching.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....
在编译stitching模块时会提示以上信息。
解决方法:
opencv/modules/stitching/CMakeLists.txt文件中加入一条语句使其include opencv_contrib/modules/xfeatures2d/include,可以是绝对路径,如
INCLUDE_DIRECTORIES("/home/john/cross_compile/src/opencv_contrib-3.4.2/modules/xfeatures2d/include")
如图,video I/O模块总是“NO”。
解决方法:
安装ffmpeg,网络搜罗一堆文章,介绍如何编译ffmpeg,但是都不能完成整个编译到安装的流程。最终结合多篇文章,使用入选命令进行编译,编译安装成功。
./configure --enable-cross-compile --target-os=linux --cc=aarch64-linux-gnu-gcc --arch=arm --enable-shared --disable-static --enable-gpl --enable-nonfree --enable-ffmpeg --disable-ffplay --enable-ffserver --enable-swscale --enable-pthreads --disable-yasm --disable-stripping --enable-libx264 --extra-cflags=-I/usr/aarch64-linux/include --extra-ldflags=-L/usr/aarch64-linux/lib --prefix=/usr/aarch64-linux --cpu=cortex-a73 --disable-asm
将ffmpeg加入pkg-config
执行#sudo gedit /etc/bash.bashrc,在末尾加入
export LD_LIBRARY_PATH=/usr/aarch64-linux/lib/
export PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/usr/aarch64-linux/lib/pkgconfig
export PKG_CONFIG_LIBDIR=$PKG_CONFIG_LIBDIR:/usr/aarch64-linux/lib/
完毕后使用命令:
source /etc/bash.bashrc
或者单独使用三个export,不过寿命只在一个终端中,终端关闭时就失效。
接下来修改opencv/platflrms/linux/目录下的arm-gnueabi.toolchain.cmake,将其所有删掉,写入:
set( CMAKE_SYSTEM_NAME Linux )
set( CMAKE_SYSTEM_PROCESSOR arm )
set( CMAKE_C_COMPILER aarch64-linux-gnu-gcc )
set( CMAKE_CXX_COMPILER aarch64-linux-gnu-g++ )
在opencv目录下新建build目录,进入build目录,执行命令:
cmake -DCMAKE_TOOLCHAIN_FILE=../platforms/linux/arm-gnueabi.toolchain.cmake ../
见下图 “NO”变为“YES”,就OK了。
使用cmake-gui打开CMakeCache.txt,去掉所有的无关项,修改CMAKE_INSTALL_PREFIX,来确定make install的目录。
然后
make & make install
[ 72%] Linking CXX executable ../../../../bin/opencv_waldboost_detector
/home/john/linaro/gcc-linaro-6.3.1-2017.05-x86_64_aarch64-linux-gnu/bin/../lib/gcc/aarch64-linux-gnu/6.3.1/../../../../aarch64-linux-gnu/bin/ld: warning: libavcodec.so.56, needed by ../../../../lib/libopencv_videoio.so.3.4.2, not found (try using -rpath or -rpath-link)
/home/john/linaro/gcc-linaro-6.3.1-2017.05-x86_64_aarch64-linux-gnu/bin/../lib/gcc/aarch64-linux-gnu/6.3.1/../../../../aarch64-linux-gnu/bin/ld: warning: libavformat.so.56, needed by ../../../../lib/libopencv_videoio.so.3.4.2, not found (try using -rpath or -rpath-link)
/home/john/linaro/gcc-linaro-6.3.1-2017.05-x86_64_aarch64-linux-gnu/bin/../lib/gcc/aarch64-linux-gnu/6.3.1/../../../../aarch64-linux-gnu/bin/ld: warning: libavutil.so.54, needed by ../../../../lib/libopencv_videoio.so.3.4.2, not found (try using -rpath or -rpath-link)
/home/john/linaro/gcc-linaro-6.3.1-2017.05-x86_64_aarch64-linux-gnu/bin/../lib/gcc/aarch64-linux-gnu/6.3.1/../../../../aarch64-linux-gnu/bin/ld: warning: libswscale.so.3, needed by ../../../../lib/libopencv_videoio.so.3.4.2, not found (try using -rpath or -rpath-link)
../../../../lib/libopencv_videoio.so.3.4.2: undefined reference to `av_codec_get_tag@LIBAVFORMAT_56'
分析该问题中所链接的库无法找到,通过搜索发现"libavcodec.so.56"库正是编译ffmpeg所生成的库,问题也变得开朗了。既然库存在,那么就想办法将其链接起来。
方法1:修改CMakeCach.txt文件。
原始文件:
……
349 //Flags used by the CXX compiler during all build types.
350 CMAKE_CXX_FLAGS:STRING=
……
372 //Flags used by the C compiler during all build types.
373 CMAKE_C_FLAGS:STRING=
……
添加ffmpeg库路径(即问题六中交叉编译的ffmpeg文件路径,该路径下可能还包括以下交叉编译库,见下图)
添加完毕路径后:
……
349 //Flags used by the CXX compiler during all build types.
350 CMAKE_CXX_FLAGS:STRING=-Wl,-rpath-link=/usr/aarch64-linux/lib
……
372 //Flags used by the C compiler during all build types.
373 CMAKE_C_FLAGS:STRING=-Wl,-rpath-link=/usr/aarch64-linux/lib
……
在执行编译命令make & make install
根据网络上教程,自己在编译时存在的问题。ffmpeg在编译之前需要安装部分依赖库,根据搜索来的"./configure"命令,发现存在某一个库并非是交叉编译生成的,这就会导致在编译ffmpeg时提示无法找到某一个库的错误信息。详细信息查看config.log,log中的关键词
skipping incompatible /usr/aarch64-linux/lib/libxvidcore.so when searching …………
使用命令查看xxx.so文件
readelf -h xxx.so
我这里存在该问题的库是libxvid。见下图
参考:
https://blog.csdn.net/yfkyfk521/article/details/89375419
https://www.cnblogs.com/arxive/p/11778731.html
https://blog.csdn.net/u011736771/article/details/85960300
https://blog.csdn.net/u012321968/article/details/106654012/
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