在交叉编译i.MX6UL的Kernel代码时出现这个错误

CHK include/config/kernel.release
Using .. as source for kernel
GEN ./Makefile
CHK include/generated/uapi/linux/version.h
CHK include/generated/utsrelease.h
make[3]: ‘include/generated/mach-types.h’ is up to date.
CC kernel/bounds.s
In file included from ../include/linux/compiler.h:54:0,
from ../include/uapi/linux/stddef.h:1,
from ../include/linux/stddef.h:4,
from ../include/uapi/linux/posix_types.h:4,
from ../include/uapi/linux/types.h:13,
from ../include/linux/types.h:5,
from ../include/linux/page-flags.h:8,
from ../kernel/bounds.c:9:
../include/linux/compiler-gcc.h:121:30: fatal error: linux/compiler-gcc6.h: No such file or directory
#include gcc_header(GNUC)
^
compilation terminated.

原因是因为我使用的交叉编译工具链版本太高(6.2.1版本)导致，先在内核代码根目录下搜索compiler-gcc*

./include/linux/compiler-gcc3.h
./include/linux/compiler-gcc5.h
./include/linux/compiler-gcc.h
./include/linux/compiler-gcc4.h

支持的版本有3、4、5。
在Linaro官网上下载5版本的交叉编译工具链即可解决问题。