D:SoftwareOPENCVopencvbuild_opencv>mingw32-make -j 6
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"C:Program FilesCMakebincmake.exe" -E cmake_progress_start D:SoftwareOPENCVopencvbuild_opencvCMakeFiles D:SoftwareOPENCVopencvbuild_opencv\CMakeFilesprogress.marks
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D:SoftwareOPENCVopencvsources3rdpartyopenjpegopenjp2thread.c:224:24: warning: no previous prototype for 'opj_thread_callback_adapter' [-Wmissing-prototypes]
unsigned int __stdcall opj_thread_callback_adapter(void *info)
^~~~~~~~~~~~~~~~~~~~~~~~~~~
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In file included from D:SoftwareOPENCVopencvsources3rdpartyprotobufsrcgoogleprotobufarena.cc:42:0:
D:/Software/OPENCV/opencv/sources/3rdparty/protobuf/src/google/protobuf/stubs/mutex.h: In constructor 'constexpr google::protobuf::internal::WrappedMutex::WrappedMutex()':
D:/Software/OPENCV/opencv/sources/3rdparty/protobuf/src/google/protobuf/stubs/mutex.h:124:29: error: temporary of non-literal type 'google::protobuf::internal::CallOnceInitializedMutex' in a constant expression
constexpr WrappedMutex() {}
^
D:/Software/OPENCV/opencv/sources/3rdparty/protobuf/src/google/protobuf/stubs/mutex.h:98:7: note: 'google::protobuf::internal::CallOnceInitializedMutex' is not literal because:
class CallOnceInitializedMutex {
^~~~~~~~~~~~~~~~~~~~~~~~
D:/Software/OPENCV/opencv/sources/3rdparty/protobuf/src/google/protobuf/stubs/mutex.h:98:7: note: 'google::protobuf::internal::CallOnceInitializedMutex' has a non-trivial destructor
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mingw32-make: *** [Makefile:182: all] Error 2
知道这个SB问题了，opencv版本太高了，使用的是OpenCV – 4.5.5版本，不论 cmake是3.17.2，还是目前最新的cmake Latest Release (3.23.2)
均会报错。
若opencv
版本更换为opencv-4.2.0-vc14_vc15.exe，就OK了！
日！！！
ps：
3.3 .0 is outdated. why waste time with that ?
your gcc version ? (it does not seem to like the code)
you could try to disable some problematic modules like: cmake -DWITH_OPENEXR=OFF or -DBUILD_opencv_dnn=OFF
就设置这两个，可以编译通过了。也不知道为啥，也不知道啥意思，但运行还是会有问题。不太推荐。
要执行命令
mingw32-make -j 8
mingw32-make install
