Cross compile opencv with contrib

Common mistakes ：

1. Unable to resolve R_AARCH64_ADR_PREL_PG_HI21 Redirect to symbol “[email protected]@GLIBCXX_3.4.21” There are conflicts

2.../../lib/libopencv_core.so： Yes ‘pthread_mutexattr_destroy’ Undefined references
../../lib/libopencv_core.so： Yes ‘pthread_key_create’ Undefined references
../../lib/libopencv_core.so： Yes ‘pthread_getspecific’ Undefined references
../../lib/libopencv_core.so： Yes ‘dlopen’ Undefined references
../../lib/libopencv_core.so： Yes ‘pthread_mutex_trylock’ Undefined references
../../lib/libopencv_core.so： Yes ‘pthread_key_delete’ Undefined references
../../lib/libopencv_core.so： Yes ‘dlclose’ Undefined references
../../lib/libopencv_core.so： Yes ‘dlsym’ Undefined references
../../lib/libopencv_core.so： Yes ‘pthread_mutexattr_settype’ Undefined references
../../lib/libopencv_core.so： Yes ‘pthread_setspecific’ Undefined references
../../lib/libopencv_core.so： Yes ‘pthread_mutexattr_init’ Undefined references
collect2: error: ld returned 1 exit status
apps/version/CMakeFiles/opencv_version.dir/build.make:95: recipe for target 'bin/opencv_version' failed
make[2]: *** [bin/opencv_version] Error 1
CMakeFiles/Makefile2:8366: recipe for target 'apps/version/CMakeFiles/opencv_version.dir/all' failed
make[1]: *** [apps/version/CMakeFiles/opencv_version.dir/all] Error 2

This problem is because there is no setting CMAKE_EXE_LINKER_FLAGS Caused by item , So first we need to modify the CMakeCache.txt The file of , Found in file CMAKE_EXE_LINKER_FLAGS  This one , Change it to

//Flags used by the linker.
CMAKE_EXE_LINKER_FLAGS:STRING=-pthread -ldl -lrt

3. There is an error  “ libopencv_imgcodecs.so： Yes ‘png_init_filter_functions_neon’ Undefined references ”

according to   https://sourceforge.net/p/libpng/bugs/230/   The patch file issued shall be modified and re make You can solve it . Note that there are two files in the patch , It just needs to be modified pngpriv.h Can , So you can delete the file about configure.ac Part of .

How to use it patch, Many online materials can be viewed by yourself

You can also modify it manually .

open /opencv-4.1.2/3rdparty/libpng/pngpriv.h

take 130 It works

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

Change it to

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

4.

/opencv_contrib/modules/xfeatures2d/src/boostdesc.cpp:653:37: fatal error: boostdesc_bgm.i: No such file or directory
           #include "boostdesc_bgm.i"
                                     ^
compilation terminated.
modules/xfeatures2d/CMakeFiles/opencv_xfeatures2d.dir/build.make:91: recipe for target 'modules/xfeatures2d/CMakeFiles/opencv_xfeatures2d.dir/src/boostdesc.cpp.obj' failed
make[2]: *** [modules/xfeatures2d/CMakeFiles/opencv_xfeatures2d.dir/src/boostdesc.cpp.obj] Error 1

This is because the missing files failed to download or are missing , You can copy a series of library files to opencv_contrib/modules/xfeatures2d/src in , Can solve , You can find the download address by yourself or upload it on the download channel

https://download.csdn.net/download/qq_34533248/11804560
 

Reference link ：

Compile with Hess' cross compiler opencv Problems encountered in the process of _ They call me teacher Gao's blog -CSDN Blog

Linux OpenCV Cross compilation 20220322_songlixiangaibin The blog of -CSDN Blog _linux opencv Cross compilation