• 在 msys2/mingw 下安装及编译 opencv

    最简单就是直接安装

    pacman -S mingw-w64-x86_64-opencv

    脚本中最好使用环境变量 ${MINGW_PACKAGE_PREFIX} 适配

    pacman -S --needed ${MINGW_PACKAGE_PREFIX}-opencv

    以下记录一下编译的过程

    一）安装编译工具及第三方库

    注意：一定要安装 mingw-w64-x86_64-cmake  而不是 cmake，即不要执行 “pacman -S cmake”

    否则会产生 “System is unknown to cmake, create 。。。” 报错信息

    1. pacman -S --needed base-devel vim tar wget unzip protobuf
    2.  
    3. pacman -S --needed \
    4. 			${MINGW_PACKAGE_PREFIX}-cmake \
    5. 			${MINGW_PACKAGE_PREFIX}-gcc \
    6. 			${MINGW_PACKAGE_PREFIX}-toolchain \
    7. 			${MINGW_PACKAGE_PREFIX}-boost \
    8. 			${MINGW_PACKAGE_PREFIX}-ccache \
    9. 			${MINGW_PACKAGE_PREFIX}-eigen3 \
    10. 			${MINGW_PACKAGE_PREFIX}-gcc-libgfortran \
    11. 			${MINGW_PACKAGE_PREFIX}-gtk3 \
    12. 			${MINGW_PACKAGE_PREFIX}-julia \
    13. 			${MINGW_PACKAGE_PREFIX}-ogre3d \
    14. 			${MINGW_PACKAGE_PREFIX}-python \
    15. 			${MINGW_PACKAGE_PREFIX}-python2 \
    16. 			${MINGW_PACKAGE_PREFIX}-python-pip \
    17. 			${MINGW_PACKAGE_PREFIX}-python-numpy \
    18. 			${MINGW_PACKAGE_PREFIX}-vtk
    19. pacman -S --needed \
    20. 			${MINGW_PACKAGE_PREFIX}-libpng \
    21. 			${MINGW_PACKAGE_PREFIX}-libjpeg \
    22. 			${MINGW_PACKAGE_PREFIX}-libtiff \
    23. 			${MINGW_PACKAGE_PREFIX}-libwebp
    24. pacman -S --needed \
    25. 			${MINGW_PACKAGE_PREFIX}-dlib \
    26. 			${MINGW_PACKAGE_PREFIX}-ffmpeg \
    27. 			${MINGW_PACKAGE_PREFIX}-harfbuzz \
    28. 			${MINGW_PACKAGE_PREFIX}-lapack \
    29. 			${MINGW_PACKAGE_PREFIX}-openblas \
    30. 			${MINGW_PACKAGE_PREFIX}-opencl-clhpp \
    31. 			${MINGW_PACKAGE_PREFIX}-opencl-headers \
    32. 			${MINGW_PACKAGE_PREFIX}-opencl-icd \
    33. 			${MINGW_PACKAGE_PREFIX}-openmp
    34.  
    35. # optional
    36. pacman -S  --needed \
    37. 			${MINGW_PACKAGE_PREFIX}-tesseract-ocr \
    38. 			${MINGW_PACKAGE_PREFIX}-tesseract-data-chi_sim \
    39. 			${MINGW_PACKAGE_PREFIX}-tesseract-data-chi_tra

    下载 opencv4 源码并解压

    1. 	wget -O opencv.zip https://github.com/opencv/opencv/archive/4.x.zip
    2. 	wget -O opencv_contrib.zip https://github.com/opencv/opencv_contrib/archive/4.x.zip
    3. 	unzip opencv.zip
    4. 	unzip opencv_contrib.zip

     编写脚本 build-ocv.sh

    1. #!/bin/bash
    2.  
    3. BUILD_DIR=${1:-build}
    4. export OpenBLAS_HOME=/mingw64
    5. export  PATH=/mingw64/lib:/mingw64/bin:/mingw64/include:$PATH
    6.  
    7. [ -e ${BUILD_DIR} ] && rm -r ${BUILD_DIR}/* || mkdir ${BUILD_DIR} 
    8.  
    9. cmake  -B${BUILD_DIR} \
    10. 	-DOPENCV_EXTRA_MODULES_PATH=opencv_contrib-4.x/modules \
    11. 	-DCMAKE_CXX_EXTENSIONS=ON -DCMAKE_CXX_STANDARD=14 \
    12. 	-DWITH_OBSENSOR=OFF \
    13. 	-DWITH_OPENGL=ON \
    14. 	-DWITH_QT=OFF \
    15. 	-DWITH_GSTREAMER=ON \
    16. 	-DWITH_OPENCL=ON \
    17. 	-DOPENCV_ENABLE_NONFREE=ON \
    18. 	opencv-4.x
    19.  
    20. # Build
    21. [ $? -eq 0 ] &&  cmake --build ${BUILD_DIR} -j 8

    由于网络速度慢，有几个文件下载超时，我通过迅雷下载好后 

    https://raw.githubusercontent.com/opencv/opencv_3rdparty/1224f78da6684df04397ac0f40c961ed37f79ccb/ippicv/ippicv_2021.8_lnx_intel64_20230330_general.tgz

    https://raw.githubusercontent.com/opencv/opencv_3rdparty/1224f78da6684df04397ac0f40c961ed37f79ccb/ippicv/ippicv_2021.8_win_intel64_20230330_general.zip

    https://github.com/opencv/ade/archive/v0.1.2b.zip

    https://raw.githubusercontent.com/opencv/opencv_3rdparty/8afa57abc8229d611c4937165d20e2a2d9fc5a12/face_landmark_model.dat

     我通过迅雷下载后，复制到相应目录

    1. cp ippicv_2021.8_lnx_intel64_20230330_general.tgz  opencv-4.x/3rdparty/ippicv/
    2. cp ippicv_2021.8_win_intel64_20230330_general.zip  opencv-4.x/3rdparty/ippicv/
    3. cp  -f ade-0.1.2b.zip  opencv-4.x/.cache/ade/4f93a0844dfc463c617d83b09011819a-v0.1.2b.zip
    4. cp face_landmark_model.dat opencv-4.x/.cache/data/7505c44ca4eb54b4ab1e4777cb96ac05-face_landmark_model.dat

    二）错误修复：

    1.  在 msys2环境中执行 python 及 python2 失败。

    原因：msys2中的 python启动受到系统环境变量 PYTHONHOME 影响，这个环境变量一般是安装python windows 版本时被自动设置的。

    解决方法： 执行 unset  PYTHONHOME，如果不想每次启动msys都执行一次，可以写进 /etc/.bashrc 脚本中。

    2.  编译 obsensor 失败

    C:/workspace/libs/opencv/modules/videoio/src/cap_obsensor/obsensor_stream_channel_msmf.hpp:106:27: error: could not convert template argument 'cv::obsensor::ComPtr::__T_IID_getter' from 'const IID& (cv::obsensor::ComPtr::)()' {aka 'const GUID& (cv::obsensor::ComPtr::)()'} to 'const IID& (*)()' {aka 'const GUID& (*)()'}

      (参考 ：Build with Ninja (MSYS2 UCRT64) on Windows 11 fails · Issue #23070   )

    原因： obsensor backend seems not to be supported on gcc.

    解决方案 ：在cmake命令后增加 “ -DWITH_OBSENSOR=OFF ” 配置项

    3.  编译 homography.cc 出错

    编译 opencv_contrib-4.x/modules/sfm/src/libmv_light/libmv/multiview/homography.cc 是报错：

    mingw64/include/ceres/jet.h:834:10: error: 'j0' was not declared in this scope; did you mean 'V0'?

    参考  ：j0 , j1, jn was not declared in this scope, …… · Issue #3013

    解决方案： cmake 配置参数增加  -DCMAKE_CXX_EXTENSIONS=ON 和 -DCMAKE_CXX_STANDARD=14

    4.  OPENBLAS 检测失败

    -- Could not find OpenBLAS include. Turning OpenBLAS_FOUND off

     解决方案 ：增加 OpenBLAS_HOME 定义

    export OpenBLAS_HOME=/mingw64

    5.  glog/gflags 组件检测失败

    （安装 mingw-w64-x86_64-cmake  而不是 cmake，以下是坚持使用 cmake的解决方法，我是杠精。）

    查看 CMakeFile/CMakeError.log 内容

    Run Build Command(s): /usr/bin/cmake.exe -E env VERBOSE=1 /usr/bin/make.exe -f Makefile cmTC_32ed8/fast
    /usr/bin/make  -f CMakeFiles/cmTC_32ed8.dir/build.make CMakeFiles/cmTC_32ed8.dir/build
    make[1]: Entering directory '/home/rd/opencv/build/CMakeFiles/CMakeTmp'
    Building CXX object CMakeFiles/cmTC_32ed8.dir/check_glog_gflags.cpp.o
    /mingw64/bin/c++.exe -DGFLAGS_IS_A_DLL=1 -DGLOG_CUSTOM_PREFIX_SUPPORT -DGLOG_NO_ABBREVIATED_SEVERITIES -isystem/mingw64/include -fsigned-char -W -Wall -Wreturn-type -Wnon-virtual-dtor -Waddress -Wsequence-point -Wformat -Wformat-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Wsuggest-override -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -fvisibility=hidden -fvisibility-inlines-hidden  -O3 -DNDEBUG  -DNDEBUG -std=c++11 -o CMakeFiles/cmTC_32ed8.dir/check_glog_gflags.cpp.o -c /home/rd/opencv/opencv_contrib-4.x/modules/sfm/cmake/checks/check_glog_gflags.cpp
    In file included from D:/msys64/mingw64/include/glog/logging.h:45,
                     from D:/msys64/home/rd/opencv/opencv_contrib-4.x/modules/sfm/cmake/checks/check_glog_gflags.cpp:1:
    D:/msys64/mingw64/include/c++/13.2.0/cstdlib:79:15: fatal error: stdlib.h: No such file or directory
       79 | #include_next
          |               ^~~~~~~~~~
    compilation terminated.
    make[1]: *** [CMakeFiles/cmTC_32ed8.dir/build.make:78: CMakeFiles/cmTC_32ed8.dir/check_glog_gflags.cpp.o] Error 1
    make[1]: Leaving directory '/home/rd/opencv/build/CMakeFiles/CMakeTmp'
    make: *** [Makefile:127: cmTC_32ed8/fast] Error 2

    , SFM_GLOG_GFLAGS_TEST FALSE

    解决方案 ：

    增加编译宏定义 ENABLE_PRECOMPILED_HEADERS=OFF

     (参考C++编译时cstdlib中的#include_next ＜stdlib.h＞报错、解决与思考_#include_next _彩虹能场的博客-CSDN博客)

    手动测试编译指令如下，发现没有解决

    /mingw64/bin/c++.exe -DENABLE_PRECOMPILED_HEADERS=OFF -DGFLAGS_IS_A_DLL=1 -DGLOG_CUSTOM_PREFIX_SUPPORT -DGLOG_NO_ABBREVIATED_SEVERITIES -isystem /mingw64/include -fsigned-char -W -Wall -Wreturn-type -Wnon-virtual-dtor -Waddress -Wsequence-point -Wformat -Wformat-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Wsuggest-override -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -fvisibility=hidden -fvisibility-inlines-hidden  -O3 -DNDEBUG  -DNDEBUG -std=c++11 -o CMakeFiles/cmTC_32ed8.dir/check_glog_gflags.cpp.o -c /home/rd/opencv/opencv_contrib-4.x/modules/sfm/cmake/checks/check_glog_gflags.cpp

    Use of -isystem - Development - CMake Discourse解决方案2 ：

    删除 -isystem /mingw64/include  

    或改为 -isystem/mingw64/include （去除isystem后空格）

    或改为 -I /mingw64/include  (参考  Use of -isystem - Development - CMake Discourse ）

    手动测试编译指令如下，可以生成

    /mingw64/bin/c++.exe -DGFLAGS_IS_A_DLL=1 -DGLOG_CUSTOM_PREFIX_SUPPORT -DGLOG_NO_ABBREVIATED_SEVERITIES -I /mingw64/include -fsigned-char -W -Wall -Wreturn-type -Wnon-virtual-dtor -Waddress -Wsequence-point -Wformat -Wformat-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Wsuggest-override -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -fvisibility=hidden -fvisibility-inlines-hidden  -O3 -DNDEBUG  -DNDEBUG -std=c++11 -o CMakeFiles/cmTC_32ed8.dir/check_glog_gflags.cpp.o -c /home/rd/opencv/opencv_contrib-4.x/modules/sfm/cmake/checks/check_glog_gflags.cpp

     修改 /opencv_contrib-4.x/modules/sfm/CMakeLists.txt 文件中 try_compile() 语句，增加    set(CMAKE_INCLUDE_SYSTEM_FLAG_CXX "-I")， 不好使。

    1.   if(NOT DEFINED SFM_GLOG_GFLAGS_TEST_CACHE_KEY OR NOT (SFM_GLOG_GFLAGS_TEST_CACHE_KEY STREQUAL __cache_key))
    2. 	set(CMAKE_INCLUDE_SYSTEM_FLAG_CXX "-I")
    3.     set(__fname "${CMAKE_CURRENT_LIST_DIR}/cmake/checks/check_glog_gflags.cpp")
    4.     try_compile(
    5.         SFM_GLOG_GFLAGS_TEST "${CMAKE_BINARY_DIR}" "${__fname}"
    6. 	    CMAKE_FLAGS "-DINCLUDE_DIRECTORIES:STRING=${GLOG_INCLUDE_DIRS};${GFLAGS_INCLUDE_DIRS}"
    7.         LINK_LIBRARIES ${GLOG_LIBRARIES} ${GFLAGS_LIBRARIES}
    8.         OUTPUT_VARIABLE __output
    9.     )
    10.     if(NOT SFM_GLOG_GFLAGS_TEST)
    11.       file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
    12.           "Failed compilation check: ${__fname}\n"
    13.           "${__output}\n\n"
    14.       )
    15.     endif()
    16.     set(SFM_GLOG_GFLAGS_TEST "${SFM_GLOG_GFLAGS_TEST}" CACHE INTERNAL "")
    17.     set(SFM_GLOG_GFLAGS_TEST_CACHE_KEY "${__cache_key}" CACHE INTERNAL "")
    18.     message(STATUS "Checking SFM glog/gflags deps... ${SFM_GLOG_GFLAGS_TEST}")
    19.   endif()

     修改 /usr/share/cmake/Modules/Compiler/GNU.cmake，注释掉 “ set(CMAKE_INCLUDE_SYSTEM_FLAG_${lang} "-isystem ") ” ，成功。

    6.   lapack 组件检测失败

    （安装 mingw-w64-x86_64-cmake  而不是 cmake，以下是坚持使用 cmake的解决方法，我是杠精。）

    Run Build Command(s): /usr/bin/cmake.exe -E env VERBOSE=1 /usr/bin/make.exe -f Makefile cmTC_dfa1f/fast
    /usr/bin/make  -f CMakeFiles/cmTC_dfa1f.dir/build.make CMakeFiles/cmTC_dfa1f.dir/build
    make[1]: Entering directory '/D/word/opencv/build/CMakeFiles/CMakeTmp'
    Building CXX object CMakeFiles/cmTC_dfa1f.dir/lapack_check.cpp.obj
    /mingw64/bin/CC.exe  -I/mingw64/include -I/D/tony/opencv/build -fsigned-char -W -Wall -Wreturn-type -Wnon-virtual-dtor -Waddress -Wsequence-point -Wformat -Wformat-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Wsuggest-override -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -fomit-frame-pointer -ffunction-sections -fdata-sections  -fvisibility=hidden -fvisibility-inlines-hidden  -O3 -DNDEBUG  -DNDEBUG -std=c++11 -fPIE -o CMakeFiles/cmTC_dfa1f.dir/lapack_check.cpp.obj -c /D/work/opencv/opencv-4.x/cmake/checks/lapack_check.cpp
    In file included from D:/rd/opencv/opencv-4.x/cmake/checks/lapack_check.cpp:2:
    D:/work/opencv/build/opencv_lapack.h:11:10: fatal error: /mingw64/include/cblas.h: No such file or directory
       11 | #include "/mingw64/include/cblas.h"
          |          ^~~~~~~~~~~~~~~~~~~~~~~~~~
    compilation terminated.
    make[1]: *** [CMakeFiles/cmTC_dfa1f.dir/build.make:78: CMakeFiles/cmTC_dfa1f.dir/lapack_check.cpp.obj] Error 1
    make[1]: Leaving directory '/D/rd/opencv/build/CMakeFiles/CMakeTmp'
    make: *** [Makefile:127: cmTC_dfa1f/fast] Error 2

    直接命令行执行编译指令可以复现这个错误。

    问题来源：

          此天坑是由于 mingw的unix形式路径(/mingw64/include)都应该转化成windows形式使用(C:/msys2/ming64/include)，一般 mingw会帮你自动完成，但是 gcc( g++、cc) 不是为 mingw 维护的，所以gcc可不会转换这个绝对路径。于是死球。

    参考：gcc/g++ cannot include file with absolute path · Issue #6711 · msys2/MINGW-packages · GitHub

          如果山不向你而来，你就应该向山撞去，

    修改 opencv-4.x/cmake/OpenCVFindLAPACK.cmake

    和 opencv-4.x/cmake/OpenCVFindLAPACK-DBG.cmake。

          删除 _find_header_file_in_dirs() 调用中的第三个参数  ${LAPACK_INCLUDE_DIR}，这个参数会产生一个绝对路径，这个参数值正是 /mingw64/include

    1. macro(_find_header_file_in_dirs VAR NAME)
    2.   unset(${VAR})
    3.   unset(${VAR} CACHE)
    4.   if(" ${ARGN}" STREQUAL " ")
    5.     check_include_file("${NAME}" HAVE_${VAR})
    6.     if(HAVE_${VAR})
    7.       set(${VAR} "${NAME}") # fallback
    8.     else()
    9.       set(${VAR} "")
    10.     endif()
    11.   else()
    12.     find_path(${VAR} "${NAME}" ${ARGN} NO_DEFAULT_PATH)
    13.     if(${VAR})
    14.       set(${VAR} "${${VAR}}/${NAME}")
    15.       unset(${VAR} CACHE)
    16.     else()
    17.       unset(${VAR} CACHE)
    18.       set(${VAR} "")
    19.     endif()
    20.   endif()
    21. endmacro()
    22.  
    23. macro(ocv_lapack_check)
    24.   string(REGEX REPLACE "[^a-zA-Z0-9_]" "_" _lapack_impl "${LAPACK_IMPL}")
    25.   message(STATUS "LAPACK(${LAPACK_IMPL}): LAPACK_LIBRARIES: ${LAPACK_LIBRARIES}")
    26.   ## _find_header_file_in_dirs(OPENCV_CBLAS_H_PATH_${_lapack_impl} "${LAPACK_CBLAS_H}" "${LAPACK_INCLUDE_DIR}")
    27.   _find_header_file_in_dirs(OPENCV_CBLAS_H_PATH_${_lapack_impl} "${LAPACK_CBLAS_H}" )
    28.   ## _find_header_file_in_dirs(OPENCV_LAPACKE_H_PATH_${_lapack_impl} "${LAPACK_LAPACKE_H}" "${LAPACK_INCLUDE_DIR}")
    29.   _find_header_file_in_dirs(OPENCV_LAPACKE_H_PATH_${_lapack_impl} "${LAPACK_LAPACKE_H}")

     之后，链接 lapack_check.obj 报错无数

    D:/msys64/mingw64/lib/libopenblas.a(sgemm_direct_performant_BULLDOZER.c.obj):(.text+0x41): undefined reference to `omp_get_max_threads'

    手动执行编译指令调试

    1. echo " lapack_check.cpp  -->  lapack_check.obj  "
    2.  
    3. /mingw64/bin/CC.exe  -I/mingw64/include -I/D/tony/opencv/build -fsigned-char -W -Wall -Wreturn-type -Wnon-virtual-dtor -Waddress -Wsequence-point -Wformat -Wformat-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Wsuggest-override -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -fomit-frame-pointer -ffunction-sections -fdata-sections  -fvisibility=hidden -fvisibility-inlines-hidden  -O3 -DNDEBUG  -DNDEBUG -std=c++11 -fPIE \
    4. -o lapack_check.cpp.obj \
    5. -c opencv-4.x/cmake/checks/lapack_check.cpp
    6.  
    7. echo " lapack_check.obj  -->  lapack_check.out  "
    8.  
    9. /mingw64/bin/CC.exe    -fsigned-char -W -Wall -Wreturn-type -Wnon-virtual-dtor -Waddress -Wsequence-point -Wformat -Wformat-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Wsuggest-override -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -fomit-frame-pointer -ffunction-sections -fdata-sections  -fvisibility=hidden -fvisibility-inlines-hidden  -O3 -DNDEBUG  -DNDEBUG   -Wl,--gc-sections \
    10. lapack_check.cpp.obj \
    11. -o lapack_check.out  \
    12. /mingw64/lib/libopenblas.a

    发现还需要追加静态库

    •  /mingw64/lib/libgomp.a
    • /mingw64/lib/gcc/x86_64-w64-mingw32/13.2.0/libgfortran.a
    • /mingw64/lib/libquadmath.a

     手动编译成功

    1. /mingw64/bin/CC.exe    -fsigned-char -W -Wall -Wreturn-type -Wnon-virtual-dtor -Waddress -Wsequence-point -Wformat -Wformat-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Wsuggest-override -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -fomit-frame-pointer -ffunction-sections -fdata-sections  -fvisibility=hidden -fvisibility-inlines-hidden  -O3 -DNDEBUG  -DNDEBUG   -Wl,--gc-sections \
    2. lapack_check.cpp.obj \
    3. -o lapack_check.out \
    4. /mingw64/lib/libopenblas.a \
    5. /mingw64/lib/libgomp.a \
    6. /mingw64/lib/gcc/x86_64-w64-mingw32/13.2.0/libgfortran.a \
    7. /mingw64/lib/libquadmath.a

    ，修改 opencv-4.x/cmake/OpenCVFindLAPACK.cmake

    和 opencv-4.x/cmake/OpenCVFindLAPACK-DBG.cmake 如下：

    1. -  set(LAPACK_LIBRARIES    ${OpenBLAS_LIB}
    2. +  set(LAPACK_LIBRARIES    ${OpenBLAS_LIB} 
    3. +           /mingw64/lib/gcc/x86_64-w64-mingw32/13.2.0/libgfortran.a 
    4. +           /mingw64/lib/libquadmath.a
    5. +           /mingw64/lib/libgomp.a 
    6. +   )

    因为没有检查 libgomp等库是否存在，不算是一个完整的补丁，但效果不减。

    （哎，干怎么多都不如安装正确的cmake版本，我真傻。）

    7.  工作目录名的坑

    工作目录名不要用 opencv2，否则编译 opencv-4.x/modules/gapi/misc/python/python_bridge.hpp
    会报错。

    祝好运。

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  • 原文地址：https://blog.csdn.net/Tonyfield/article/details/133406390