编译OpenCV

1.进入第二部分编译后的生成文件目录E:\software\opencv-3.4.2\build

输入“mingw32-make”命令，按回车进行编译。

等待编译：

发现错误： identifier ‘nullptr’ is a keyword in C++11 错误

解决：

这是由于c++11引入了nullptr，因此给make添加参数，直接回到cmake添加：

在 cmake-gui 编译配置中：

勾选 ENABLE_CXX11

而后从新Configure-Generate-mingw32-make

再次编译，再次出现： error: 'sprintf_instead_use_StringCbPrintfA_or_StringCchPrintfA' was not declared in this scope

解决：

而后回到命令行，继续编译，发现

解决：error: 'MFP_MEDIAITEM_CHARACTERISTICS' has not been declared 参考：https://stackoverflow.com/questions/50333886/opencv-installation-on-windows When not using Visual Studio, you have to disable some features which are not supported. Build with cmake options WITH_IPP=OFF and WITH_MSMF=OFF