set(CMAKE_SYSTEM_NAME Linux)
set(CMAKE_SYSTEM_PROCESSOR arm)

# Linaro GCC 4.9.4 2017.01，与 IMX6U 开发板原厂一致
# 解压：tar -xJf gcc-linaro-4.9.4-2017.01-x86_64_arm-linux-gnueabihf.tar.xz -C ~/toolchains
set(IMX6U_TOOLCHAIN_ROOT "$ENV{HOME}/toolchains/gcc-linaro-4.9.4-2017.01-x86_64_arm-linux-gnueabihf")
set(CMAKE_C_COMPILER   "${IMX6U_TOOLCHAIN_ROOT}/bin/arm-linux-gnueabihf-gcc")
set(CMAKE_CXX_COMPILER "${IMX6U_TOOLCHAIN_ROOT}/bin/arm-linux-gnueabihf-g++")
set(CMAKE_SYSROOT      "${IMX6U_TOOLCHAIN_ROOT}/arm-linux-gnueabihf/libc")

set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)