Comment 26 for bug 1776616

Ok, I started with v4.5 and v4.6. I successfully did a couple iterations, after adding the follownig CFLAGS to Makefile to get past compiler errors:

-fno-pie -fno-stack-protector

But I then ran into this error when trying to compile both 4.9.0 and 4.8.0:

kernel/built-in.o: In function `update_wall_time':
/data/ubuntu_mainline_kernel/linux/kernel/time/timekeeping.c:2073: undefined reference to `____ilog2_NaN'

This appears to be a problem with GCC 7:

https://lore.kernel.org/lkml/20170225081810.GA1364@x4/

This is taking too much time, and I don't use this laptop enough to justify the time expenditure.