opencv交叉编译和遇到的问题

flyfish
环境：

Ubuntu18.04
cmake-gui
Cmake 3.10.2
opencv-4.5.5

启动cmake-gui
终端执行 cmake-gui
设置源码路径和构建二进制路径
点击config，设置交叉编译选项
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设置最后安装的路径
配置CMAKE_INSTALL_PREFIX,设置最后include和lib的所在的路径
勾选BUILD_ZLIB,BUILD_opencv_world
配置完之后点击Generate

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进入build目录执行make -j4

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如果问题，可以尝试下面给出的解决方案
最后执行make install安装

遇到的问题
涉及更改CMakeCache.txt文件

CMAKE_CXX_FLAGS:STRING=  -Wno-psabi -ldl -lpthread

问题1

include/c++/8.3.0/bits/stl_vector.h:1085:4: 附注： parameter passing for argument of type ‘__gnu_cxx::__normal_iterator<long long int*, std::vector<long long int> >’ changed in GCC 7.1
    _M_realloc_insert(end(), __x);

更改CMakeCache.txt文件

CMAKE_CXX_FLAGS:STRING= -Wno-psabi

问题2

../../lib/libopencv_world.so: undefined reference to `dlsym'
collect2: 错误： ld 返回 1
apps/version/CMakeFiles/opencv_version.dir/build.make:95: recipe for target 'bin/opencv_version' failed
make[2]: *** [bin/opencv_version] Error 1
CMakeFiles/Makefile2:3026: recipe for target 'apps/version/CMakeFiles/opencv_version.dir/all' failed

解决方案
更改CMakeCache.txt文件

CMAKE_CXX_FLAGS:STRING= -ldl

问题3

libopencv_world.so: undefined reference to `png_do_expand_palette_rgb8_neon'

 undefined reference to `png_init_filter_functions_neon'
 undefined reference to `png_do_expand_palette_rgba8_neon'
 undefined reference to `png_riffle_palette_neon'

解决方案
opencv-4.5.5/3rdparty/libpng/pngpriv.h

#  if (defined(__ARM_NEON__) || defined(__ARM_NEON)) && \

更改为

#  if defined(PNG_ARM_NEON) && (defined(ARM_NEON) || defined(__ARM_NEON)) && \

问题4

/arm-linux-gnueabihf/libc/lib/libpthread.so.0: error adding symbols: DSO missing from command line
collect2: 错误： ld 返回 1
modules/world/CMakeFiles/opencv_perf_dnn.dir/build.make:304: recipe for target 'bin/opencv_perf_dnn' failed
make[2]: *** [bin/opencv_perf_dnn] Error 1
CMakeFiles/Makefile2:1572: recipe for target 'modules/world/CMakeFiles/opencv_perf_dnn.dir/all' failed
make[1]: *** [modules/world/CMakeFiles/opencv_perf_dnn.dir/all] Error 2

解决方案
更改CMakeCache.txt文件