MinGW >> OpenCV

安装環境

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參考資訊：
1. cross-compiling-opencv-with-mingw-using-cmakein-linux-for-windows

如下：

$ cd
$ wget https://github.com/opencv/opencv/archive/4.3.0.zip
$ unzip 4.3.0.zip
$ mkdir -p opencv-4.3.0/build
$ cd opencv-4.3.0/build
$ vim ../platforms/linux/mingw.toolchain.cmake
    SET(CMAKE_SYSTEM_NAME Windows)
    SET(CMAKE_C_COMPILER x86_64-w64-mingw32-gcc)
    SET(CMAKE_CXX_COMPILER x86_64-w64-mingw32-g++)
    SET(CMAKE_RC_COMPILER x86_64-w64-mingw32-windres)
    SET(CMAKE_FIND_ROOT_PATH  /usr/x86_64-w64-mingw32)
    SET(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
    SET(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
    SET(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)

$ cmake .. -DCMAKE_TOOLCHAIN_FILE=../platforms/linux/mingw.toolchain.cmake -DCMAKE_INSTALL_PREFIX=/usr/x86_64-w64-mingw32
$ make -j4
$ sudo make install

$ cd
$ wget https://github.com/opencv/opencv_contrib/archive/4.3.0.tar.gz
$ tar xvf 4.3.0.tar.gz
$ mkdir opencv_contrib-4.3.0/build
$ cd opencv_contrib-4.3.0/build
$ vim ../mingw.toolchain.cmake
    SET(CMAKE_SYSTEM_NAME Windows)
    SET(CMAKE_C_COMPILER x86_64-w64-mingw32-gcc)
    SET(CMAKE_CXX_COMPILER x86_64-w64-mingw32-g++)
    SET(CMAKE_RC_COMPILER x86_64-w64-mingw32-windres)
    SET(CMAKE_FIND_ROOT_PATH  /usr/x86_64-w64-mingw32)
    SET(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
    SET(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
    SET(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)

$ cmake .. -DCMAKE_TOOLCHAIN_FILE=../mingw.toolchain.cmake -DCMAKE_INSTALL_PREFIX=/usr/x86_64-w64-mingw32 -DOPENCV_EXTRA_MODULES_PATH=../modules ../../opencv-4.3.0
$ make -j4
$ sudo make install

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