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OpenCV使用CMake和MinGW
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前言
之前写过的一篇博文：OpenCV使用CMake和MinGW的编译安装及其在Qt配置运行 是使用 32 位的 MinGW 在 Windows 下编译 OpenCV 生成 32 位的 dll。 而这篇博文是使用 64 位的 MinGW 编译 OpenCV 生成 64 位的 dll。 因为博主没有 64 位 qmake，所以没勾选 WITH_QT 编译好的 OpenCV（MinGW 版）：Github . huihut/OpenCV-MinGW-Build 软件环境 Windows-10-64bitMinGW-x64-4.8.1-release-posix-seh-rev5CMake-3.12.0OpenCV-3.4.1 | OpenCV-4.0.0-alpha | OpenCV-4.0.0-rc | OpenCV-4.1.0 安装 MinGW-w64 并配置环境变量下载安装：MinGW-x64-4.8.1-release-posix-seh-rev5 （博文使用 MinGW-x64-4.8.1 为例，但建议使用最新 MinGW：MinGW-w64 - for 32 and 64 bit Windows） 为用户变量 Path 添加 E:\MinGW-w64\x64-4.8.1-release-posix-seh-rev5\mingw64\bin 使环境变量生效打开命令提示符 CMD，运行 set PATH=C:，更改当前窗口任务的环境变量，关闭这个 CMD。 再次打开另一个 CMD，运行 echo %PATH%，显示最新的环境变量，会发现刚刚添加的 MinGW 环境变量已经生效。 使用 CMake 生成 OpenCV 的 Makefile打开 cmake-gui，设置源码和生成路径： Where is the source code: E:/opencv_341/opencv/sourcesWhere to build the binaries: E:/opencv_341/opencv_mingw64_build点击 Configure，设置编译器 Specify the generator for this project: MinGW MakefilesSpecify native compilersNextCompilers C: E:\MinGW-w64\x64-4.8.1-release-posix-seh-rev5\mingw64\bin\gcc.exeCompilers C++: E:\MinGW-w64\x64-4.8.1-release-posix-seh-rev5\mingw64\bin\g++.exeFinish编译配置： 勾选 WITH_OPENGL勾选 ENABLE_CXX11不勾选 WITH_IPP不勾选 ENABLE_PRECOMPILED_HEADERS点击 Configure，Generate 生成 Makefile 博主的配置信息如下： General configuration for OpenCV 3.4.1 ===================================== Version control: unknown Platform: Timestamp: 2018-07-31T02:14:11Z Host: Windows 10.0.17134 AMD64 CMake: 3.12.0 CMake generator: MinGW Makefiles CMake build tool: E:/MinGW-w64/x64-4.8.1-release-posix-seh-rev5/mingw64/bin/mingw32-make.exe Configuration: Release CPU/HW features: Baseline: SSE SSE2 SSE3 requested: SSE3 Dispatched code generation: SSE4_1 SSE4_2 FP16 AVX AVX2 requested: SSE4_1 SSE4_2 AVX FP16 AVX2 AVX512_SKX SSE4_1 (3 files): + SSSE3 SSE4_1 SSE4_2 (1 files): + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 (2 files): + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 AVX AVX (5 files): + SSSE3 SSE4_1 POPCNT SSE4_2 AVX AVX2 (9 files): + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 FMA3 AVX AVX2 C/C++: Built as dynamic libs?: YES C++11: YES C++ Compiler: E:/MinGW-w64/x64-4.8.1-release-posix-seh-rev5/mingw64/bin/g++.exe (ver 4.8.1) C++ flags (Release): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Winit-self -Wno-narrowing -Wno-delete-non-virtual-dtor -Wno-comment -fdiagnostics-show-option -Wno-long-long -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -msse3 -fvisibility=hidden -fvisibility-inlines-hidden -O3 -DNDEBUG -DNDEBUG C++ flags (Debug): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Winit-self -Wno-narrowing -Wno-delete-non-virtual-dtor -Wno-comment -fdiagnostics-show-option -Wno-long-long -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -msse3 -fvisibility=hidden -fvisibility-inlines-hidden -g -O0 -DDEBUG -D_DEBUG C Compiler: E:/MinGW-w64/x64-4.8.1-release-posix-seh-rev5/mingw64/bin/gcc.exe C flags (Release): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-narrowing -Wno-comment -fdiagnostics-show-option -Wno-long-long -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -msse3 -fvisibility=hidden -O3 -DNDEBUG -DNDEBUG C flags (Debug): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-narrowing -Wno-comment -fdiagnostics-show-option -Wno-long-long -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -msse3 -fvisibility=hidden -g -O0 -DDEBUG -D_DEBUG Linker flags (Release): -Wl,--gc-sections Linker flags (Debug): -Wl,--gc-sections ccache: NO Precompiled headers: NO Extra dependencies: opengl32 glu32 3rdparty dependencies: OpenCV modules: To be built: calib3d core dnn features2d flann highgui imgcodecs imgproc java_bindings_generator ml objdetect photo python_bindings_generator shape stitching superres ts video videoio videostab Disabled: js world Disabled by dependency: - Unavailable: cudaarithm cudabgsegm cudacodec cudafeatures2d cudafilters cudaimgproc cudalegacy cudaobjdetect cudaoptflow cudastereo cudawarping cudev java python2 python3 viz Applications: tests perf_tests apps Documentation: NO Non-free algorithms: NO Windows RT support: NO GUI: Win32 UI: YES OpenGL support: YES (opengl32 glu32) VTK support: NO Media I/O: ZLib: build (ver 1.2.11) JPEG: build (ver 90) WEBP: build (ver encoder: 0x020e) PNG: build (ver 1.6.34) TIFF: build (ver 42 - 4.0.9) JPEG 2000: build (ver 1.900.1) OpenEXR: build (ver 1.7.1) Video I/O: Video for Windows: YES DC1394: NO FFMPEG: YES (prebuilt binaries) avcodec: YES (ver 57.107.100) avformat: YES (ver 57.83.100) avutil: YES (ver 55.78.100) swscale: YES (ver 4.8.100) avresample: YES (ver 3.7.0) GStreamer: NO DirectShow: YES Parallel framework: none Trace: YES (built-in) Other third-party libraries: Lapack: NO Eigen: NO Custom HAL: NO Protobuf: build (3.5.1) NVIDIA CUDA: NO OpenCL: YES (no extra features) Include path: E:/opencv_341/opencv/sources/3rdparty/include/opencl/1.2 Link libraries: Dynamic load Python (for build): E:/Python37-32/python.exe Java: ant: NO JNI: C:/Program Files (x86)/Java/jdk1.8.0_181/include C:/Program Files (x86)/Java/jdk1.8.0_181/include/win32 C:/Program Files (x86)/Java/jdk1.8.0_181/include Java wrappers: NO Java tests: NO Matlab: NO Install to: E:/opencv_341/opencv_mingw64_build/install ----------------------------------------------------------------- Configuring done Generating done 编译 OpenCV打开终端进行编译：（-j 是使用 8 个线程进行编译，请根据你的计算机配置合理设置线程数） E: cd E:\opencv_341\opencv_mingw64_build mingw32-make -j 8 mingw32-make install如果 mingw32-make -j 8 遇到错误，请看下面的 编译 OpenCV 常见错误，否则执行 mingw32-make install，完成安装。 编译 OpenCV 常见错误 1. MinGW-w64 的 aviriff.h 文件注释错误 表现 [ 49%] Building CXX object modules/videoio/CMakeFiles/opencv_videoio.dir/src/cap_dshow.cpp.obj In file included from E:\opencv_341\opencv\sources\modules\videoio\src\cap_dshow.cpp:113:0: e:\mingw-w64\x64-4.8.1-release-posix-seh-rev5\mingw64\x86_64-w64-mingw32\include\aviriff.h:2:8: error: expected constructor, destructor, or type conversion before 'file' * This file is part of the mingw-w64 runtime package. ^ e:\mingw-w64\x64-4.8.1-release-posix-seh-rev5\mingw64\x86_64-w64-mingw32\include\aviriff.h:3:25: error: 'refer' does not name a type * No warranty is given; refer to the file DISCLAIMER within this package. ^ In file included from e:\mingw-w64\x64-4.8.1-release-posix-seh-rev5\mingw64\x86_64-w64-mingw32\include\aviriff.h:19:0, from E:\opencv_341\opencv\sources\modules\videoio\src\cap_dshow.cpp:113: e:\mingw-w64\x64-4.8.1-release-posix-seh-rev5\mingw64\x86_64-w64-mingw32\include\pshpack2.h:7:21: error: expected declaration before end of line #pragma pack(push,2) ^ modules\videoio\CMakeFiles\opencv_videoio.dir\build.make:146: recipe for target 'modules/videoio/CMakeFiles/opencv_videoio.dir/src/cap_dshow.cpp.obj' failed mingw32-make[2]: *** [modules/videoio/CMakeFiles/opencv_videoio.dir/src/cap_dshow.cpp.obj] Error 1 CMakeFiles\Makefile2:3057: recipe for target 'modules/videoio/CMakeFiles/opencv_videoio.dir/all' failed mingw32-make[1]: *** [modules/videoio/CMakeFiles/opencv_videoio.dir/all] Error 2 Makefile:161: recipe for target 'all' failed mingw32-make: *** [all] Error 2
打开E:\MinGW-w64\x64-4.8.1-release-posix-seh-rev5\mingw64\x86_64-w64-mingw32\include\aviriff.h 发现第一行的多行注释少了个/符号，加上保存，如下： /** * This file is part of the mingw-w64 runtime package. * No warranty is given; refer to the file DISCLAIMER within this package. */然后重新 Configure-Generate-mingw32-make 就好了。 2. cap_msmf.cpp capture code 错误【2018年10月13日修改，因编译 OpenCV-4.0.0-alpha 时遇到并解决】 表现 ...... E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\videoio\src\cap_msmf.cpp: In member function 'HRESULT {anonymous}::ComPtr::As({anonymous}::ComPtr&) const [with U = IMF2DBuffer; T = IMFMediaBuffer; HRESULT = long int]': E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\videoio\src\cap_msmf.cpp:172:5: error: control reaches end of non-void function [-Werror=return-type] } ^ E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\videoio\src\cap_msmf.cpp: In member function 'T* {anonymous}::ComPtr::operator->() const [with T = IMF2DBuffer]': E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\videoio\src\cap_msmf.cpp:149:5: error: control reaches end of non-void function [-Werror=return-type] } ^ E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\videoio\src\cap_msmf.cpp: In member function 'T* {anonymous}::ComPtr::operator->() const [with T = IMFMediaBuffer]': E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\videoio\src\cap_msmf.cpp:149:5: error: control reaches end of non-void function [-Werror=return-type] } ^ E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\videoio\src\cap_msmf.cpp: In member function 'T* {anonymous}::ComPtr::operator->() const [with T = IMFSinkWriter]': E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\videoio\src\cap_msmf.cpp:149:5: error: control reaches end of non-void function [-Werror=return-type] } ^ E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\videoio\src\cap_msmf.cpp: In member function 'T* {anonymous}::ComPtr::Get() const [with T = IMFMediaBuffer]': E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\videoio\src\cap_msmf.cpp:158:5: error: control reaches end of non-void function [-Werror=return-type] } ^ cc1plus.exe: some warnings being treated as errors modules\videoio\CMakeFiles\opencv_videoio.dir\build.make:188: recipe for target 'modules/videoio/CMakeFiles/opencv_videoio.dir/src/cap_msmf.cpp.obj' failed mingw32-make[2]: *** [modules/videoio/CMakeFiles/opencv_videoio.dir/src/cap_msmf.cpp.obj] Error 1 CMakeFiles\Makefile2:2556: recipe for target 'modules/videoio/CMakeFiles/opencv_videoio.dir/all' failed mingw32-make[1]: *** [modules/videoio/CMakeFiles/opencv_videoio.dir/all] Error 2 mingw32-make[1]: *** Waiting for unfinished jobs.... [ 58%] Linking CXX shared library ..\..\bin\libopencv_dnn400.dll [ 59%] Built target opencv_dnn Makefile:161: recipe for target 'all' failed mingw32-make: *** [all] Error 2
因为 MinGW 不能编译 OpenCV 的 cap_msmf 那部分代码，具体见我提的 Issue：Failed to compile opencv-4.0.0-alpha using mingw-w64。 解决所以，在 cmake-gui 编译配置中： 不勾选 WITH_MSMF然后重新 Configure-Generate-mingw32-make 3. ‘M_PI’ was not declared in this scope 错误【2018年10月13日修改，因编译 OpenCV-4.0.0-alpha 时遇到并解决】 表现 [ 86%] Building CXX object modules/calib3d/CMakeFiles/opencv_calib3d.dir/src/chessboard.cpp.obj In file included from E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\calib3d\src\chessboard.cpp:7:0: E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\calib3d\src\chessboard.hpp: In constructor 'cv::details::FastX::Parameters::Parameters()': E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\calib3d\src\chessboard.hpp:35:36: error: 'M_PI' was not declared in this scope resolution = float(M_PI*0.25); ^ E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\calib3d\src\chessboard.cpp: At global scope: E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\calib3d\src\chessboard.cpp:25:42: error: 'M_PI' was not declared in this scope const float MAX_ANGLE = float(48.0/180.0*M_PI); // max angle between line segments supposed to be straight ^ E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\calib3d\src\chessboard.cpp:26:48: error: 'M_PI' was not declared in this scope const float MIN_COS_ANGLE = float(cos(35.0/180*M_PI)); // min cos angle between board edges ^ E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\calib3d\src\chessboard.cpp:29:35: error: 'M_PI' was not declared in this scope const float RAD2DEG = float(180.0/M_PI); ^ E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\calib3d\src\chessboard.cpp: In function 'int cv::details::testPointSymmetry(cv::Mat, cv::Point2f, float, float)': E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\calib3d\src\chessboard.cpp:217:33: error: 'M_PI' was not declared in this scope for(double angle=0;angle M_PI*0.5) ^ E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\calib3d\src\chessboard.cpp:1543:16: error: 'M_PI' was not declared in this scope if(a2> M_PI*0.5) ^ E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\calib3d\src\chessboard.cpp: In static member function 'static bool cv::details::Chessboard::Board::estimateSearchArea(const Point2f&, const Point2f&, const Point2f&, float, cv::details::Ellipse&, const Point2f*)': E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\calib3d\src\chessboard.cpp:1787:28: error: 'M_PI' was not declared in this scope angle = float(2.0F*M_PI-angle); ^ E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\calib3d\src\chessboard.cpp: In member function 'void cv::details::Chessboard::findKeyPoints(const cv::Mat&, std::vector&, std::vector&, std::vector&, const cv::Mat&) const': E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\calib3d\src\chessboard.cpp:2793:29: error: 'M_PI' was not declared in this scope para.resolution = float(M_PI*0.25); // this gives the best results taking interpolation into account ^ E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\calib3d\src\chessboard.cpp: In member function 'cv::Mat cv::details::Chessboard::buildData(const std::vector&) const': E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\calib3d\src\chessboard.cpp:2844:30: error: 'M_PI' was not declared in this scope (*val++) = float(2.0*M_PI-iter->angle/180.0*M_PI); ^ E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\calib3d\src\chessboard.cpp: In member function 'std::vector cv::details::Chessboard::getInitialPoints(cv::flann::Index&, const cv::Mat&, const cv::KeyPoint&, float, float, float) const': E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\calib3d\src\chessboard.cpp:2874:25: error: 'M_PI' was not declared in this scope if(angle_temp > M_PI*0.5) ^ E:\opencv-4.0.0-alpha\opencv-4.0.0-alpha\modules\calib3d\src\chessboard.cpp:2879:29: error: 'M_PI' was not declared in this scope if(angle_temp > M_PI*0.5) ^ modules\calib3d\CMakeFiles\opencv_calib3d.dir\build.make:137: recipe for target 'modules/calib3d/CMakeFiles/opencv_calib3d.dir/src/chessboard.cpp.obj' failed mingw32-make[2]: *** [modules/calib3d/CMakeFiles/opencv_calib3d.dir/src/chessboard.cpp.obj] Error 1 CMakeFiles\Makefile2:3018: recipe for target 'modules/calib3d/CMakeFiles/opencv_calib3d.dir/all' failed mingw32-make[1]: *** [modules/calib3d/CMakeFiles/opencv_calib3d.dir/all] Error 2 Makefile:161: recipe for target 'all' failed mingw32-make: *** [all] Error 2
因为 OpenCV 在 chessboard.cpp、chessboard.hpp、test_chesscorners.cpp 这些代码中有 BUG，使用的应该是 CV_PI 而不是 M_PI 导致的。具体见我提的 Issue：Failed to compile opencv-4.0.0-alpha using mingw-w64 解决在最新的 master 分支已经解决了这个问题，见我的 PR：M_PI changed to CV_PI 如果你是在 官网 或者 github.com/opencv/opencv/releases 中下的 OpenCV 4.0.0-alpha，可能还会有这个问题，那么你需要把 chessboard.cpp、chessboard.hpp、test_chesscorners.cpp 文件中的 M_PI 全部改为 CV_PI，如我的 commit 所示：M_PI changed to CV_PI (#12645) 然后重新 Configure-Generate-mingw32-make 4. ‘posix_memalign’ was not declared in this scope 错误【2018年11月17日修改，因编译 OpenCV-4.0.0-rc 时遇到并解决】 表现 [ 28%] Building CXX object modules/CMakeFiles/ade.dir/__/3rdparty/ade/ade-0.1.1c/sources/ade/source/alloc.cpp.obj E:\opencv-4.0.0-rc\opencv-4.0.0-rc-build\3rdparty\ade\ade-0.1.1c\sources\ade\source\alloc.cpp: In function 'void* ade::aligned_alloc(std::size_t, std::size_t)': E:\opencv-4.0.0-rc\opencv-4.0.0-rc-build\3rdparty\ade\ade-0.1.1c\sources\ade\source\alloc.cpp:31:16: error: 'posix_memalign' was not declared in this scope auto res = posix_memalign(&ret, std::max(sizeof(void*), alignment), size); ^~~~~~~~~~~~~~ mingw32-make[2]: *** [modules\CMakeFiles\ade.dir\build.make:63: modules/CMakeFiles/ade.dir/__/3rdparty/ade/ade-0.1.1c/sources/ade/source/alloc.cpp.obj] Error 1 mingw32-make[1]: *** [CMakeFiles\Makefile2:884: modules/CMakeFiles/ade.dir/all] Error 2 mingw32-make: *** [Makefile:162: all] Error 2
因为我使用了 MinGW-w64-8.1.0 编译，而新的编译器在 Windows 下不再定义 WIN32，而定义成 _WIN32，如这个 Issue 的问题：error: ‘posix_memalign’ was not declared in this scope #12831 解决把 opencv-4.0.0-rc-build\3rdparty\ade\ade-0.1.1c\sources\ade\source\alloc.cpp 文件的所有 WIN32 改为 _WIN32，如这个 PR 所做的修改：fix check for win32 #6 然后重新 Configure-Generate-mingw32-make 5. ‘D3D11_TEXTURE2D_DESC’ was not declared in this scope 错误【2019年4月10日修改，因编译 OpenCV-4.1.0 时遇到并解决】 表现 [ 32%] Building CXX object modules/core/CMakeFiles/opencv_core.dir/src/directx.cpp.obj E:\opencv-4.1.0\opencv-4.1.0\modules\core\src\directx.cpp: In function 'void cv::directx::__convertToD3D11Texture2DNV(cv::InputAray, ID3D11Texture2D*)': E:\opencv-4.1.0\opencv-4.1.0\modules\core\src\directx.cpp:1035:5: error: 'D3D11_TEXTURE2D_DESC' was not declared in this scope D3D11_TEXTURE2D_DESC desc = { 0 }; ^~~~~~~~~~~~~~~~~~~~
D3D11_TEXTURE2D_DESC 在 d3d11.h 中定义，貌似在我的机器上找不到定义。反正也不用 D3D11 与 OpenCL 交互，因此可以关闭 WITH_OPENCL_D3D11_NV 这个选项（默认是开的）。可见我的 issue：Error compiling 4.1.0 source code with mingw-w64: ‘D3D11_TEXTURE2D_DESC’ was not declared in this scope #14286 解决方法一： 在 cmake-gui 编译配置中： 不勾选 WITH_OPENCL_D3D11_NV然后重新 Configure-Generate-mingw32-make 方法二： 如这个 PR 中对这两个 cmake 文件的修改：cmake: fix WITH_OPENCL_D3D11_NV check #14294，即可先判断是否可以用，再设置默认的 WITH_OPENCL_D3D11_NV 其他错误如果以上错误不是你所遇到的，请务必先看下面两个文章中的错误。 编译 32位 OpenCV 博文的常见错误Tutorial: Installation from source for Windows with Mingw-w64 更新日志 2018年10月13日为 OpenCV-4.0.0-alpha 而修改，主要改了 “编译 OpenCV 常见错误”2018年11月17日为 OpenCV-4.0.0-rc 而修改，主要改了 “编译 OpenCV 常见错误”2019年4月10日为 OpenCV-4.1.0 而修改，主要改了 “编译 OpenCV 常见错误” |
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