ubuntu 16gcc g++版本降級

打算在ubuntu16上編譯linux3.4.66內核，但是遇到

In file included from include/linux/compiler.h:48:0,
from include/linux/stddef.h:4,
from include/linux/posix_types.h:4,
from include/linux/types.h:17,
from include/linux/page-flags.h:8,
from kernel/bounds.c:9:
include/linux/compiler-gcc.h:100:30: fatal error: linux/compiler-gcc5.h: No such file or directory

第一反應是gcc版本過高.於是開始gcc降級之路

先安裝gcc4.8

apt-get install gcc-4.8

把4.8加入候選
update-alternatives –install /usr/bin/gcc gcc /usr/bin/gcc-4.8 100 （並且優先級爲100）

然後查看gcc版本 gcc -v

後面的g++大家也可以按上面方法更換

後來真正解決問題的是添加了缺失的頭文件

解決方法:https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/plain/include/linux/compiler-gcc5.h?id=2c07053b8e1e0c22bb54dfbdf8e86a70f8bf00fc

複製內容保存爲compiler-gcc5.h，放在要編譯內核模塊的內核代碼的include/linux下