CMake交叉编译

        原有CMakeLists.txt中的内容保持不变。新增加一个文件，如toolChain.cmake

set(CMAKE_SYSTEM_NAME Linux)
set(CMAKE_C_COMPILER /opt/tools/cgtools/gcc-arm-9.2-2019.12-x86_64-aarch64-none-linux-gnu/bin/aarch64-none-linux-gnu-gcc)
set(CMAKE_CXX_COMPILER /opt/tools/cgtools/gcc-arm-9.2-2019.12-x86_64-aarch64-none-linux-gnu/bin/aarch64-none-linux-gnu-g++)
set(CMAKE_CROSSCOMPILING TRUE)
set(CMAKE_SYSTEM_PROCESSOR arm)
set(CMAKE_FIND_ROOT_PATH /opt/tools/cgtools/gcc-arm-9.2-2019.12-x86_64-aarch64-none-linux-gnu/aarch64-none-linux-gnu/lib64 
                        /opt/cross/3rdparty/include 
                        /opt/cross/3rdparty/lib/aarch64)

set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER) #可执行程序不仅仅只是在设置的ROOT_PATH查找
SET(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)  #只在设置的ROOT_PATH下查找库
SET(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)  #只在设置的ROOT_PATH下查找头文件

        在运行cmake的时候指定TOOLCHAIN_FILE, 如：cmake -DCMAKE_TOOLCHAIN_FILE=./toolChain.cmake ..

        然后 make即可