ubuntu x86

cd opencv-4.2.0
mkdir build
cd build

新建文件 aarch64-linux-gnu.cmake，在里面添加如下内容(相关路径根据实际设置)。

 SET(CMAKE_SYSTEM_NAME Linux) 
 SET(CMAKE_SYSTEM_PROCESSOR aarch64) 
 SET(CMAKE_C_COMPILER   "aarch64-linux-gnu-gcc") 
 SET(CMAKE_CXX_COMPILER "aarch64-linux-gnu-g++") 
 SET(CMAKE_FIND_ROOT_PATH /usr/aarch64-linux-gnu/bin)                    

生成makefile：

cmake .. -DCMAKE_TOOLCHAIN_FILE=./aarch64-linux-gnu.cmake -DCMAKE_INSTALL_PREFIX=./install -DCMAKE_BUILD_TYPE=Release

​### 2.编译

make
make install