From: Michael Hofmann on
gitlab.com
https://gitlab.com/cki-project/kernel-ark/-/merge_requests/2907#note_1749...
the first failure is 30 seconds into the build:
```
/usr/bin/make CROSS_COMPILE=ppc64le-linux-gnu- ... vmlinux
00:00:28 cc1: error: bad value ‘power8’ for ‘-mtune=’ switch
```
I'm a bit at a loss why this `cc1` is not the cross compiler, but the native
one; the same seems (?) to work fine on ELN