add cross build enviroment in kernel2

[gkernelci]

add cross build enviroment in kernel2

[mjeveritt]

@aliceinwire can I get access to kernel2?

If so, I will set up crossdev and build an arm toolchain or two, and we can get some testing going ..

I have armv7, armv6 (old R-Pi) and aarch64 hardware available .. although perhaps we can ask whether it would be better to use the packet.net box for aarch64 and do the building natively - what do you think? Leio is point-of-contact for that if/when we want to try it.

[mjeveritt]

@aliceinwire can I get access to kernel2?

If so, I will set up crossdev and build an arm toolchain or two, and we can get some testing going ..

I have been corrected on this .. will set the process in motion later this evening (2018-07-12).

[aliceinwire]

As now I'm trying to use the following command but without success:
crossdev -S -t armv7a-hardfloat-linux-gnueabi-gcc

 * error: binutils failed :(
 *
 * If you file a bug, please attach the following logfiles:
 * /var/log/portage/cross-armv7a-hardfloat-linux-gnueabi-gcc-info.log
 * /var/log/portage/cross-armv7a-hardfloat-linux-gnueabi-gcc-binutils.log.xz
 * /var/tmp/portage/cross-armv7a-hardfloat-linux-gnueabi-gcc/binutils*/temp/binutils-config.logs.tar.xz

[aliceinwire]

from binutils logs, there is something wrong in the configuration process
can you investigate?

[aliceinwire]

https://paste.pound-python.org/show/aD9Lcn8cTioAbJmYSuZP/

[kuzetsa]

I just ran two commands to investigate:

emerge --ask app-portage/gentoolkit
eshowkw sys-devel/crossdev 

the amd64 keyword-stabilized sys-devel/crossdev-20171230 is the installed version.

locally (not on kernel2) I'll try to test with newer crossdev before doing anything else.

[kuzetsa]

I didn't notice at first, but I think -gcc isn't
considered by crossdev part of a tuple:

crossdev -S -t armv7a-hardfloat-linux-gnueabi

earlier comment removed

[kuzetsa]

$ armv7a-hardfloat-linux-gnueabi-gcc --version && \
which armv7a-hardfloat-linux-gnueabi-gcc

armv7a-hardfloat-linux-gnueabi-gcc (Gentoo Hardened 6.4.0-r1 p1.3) 6.4.0
Copyright (C) 2017 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

/usr/bin/armv7a-hardfloat-linux-gnueabi-gcc

I think issue #59 can be closed now.

[aliceinwire]

thank you 👍

[kuzetsa]

footnote:

... changing to armv7a-hardfloat-linux-newlib
(instead of armv7a-hardfloat-linux-gnueabi)

would still be a valid cross-toolchain for testing the kernel,
but it would be less of a gentoo-specific test to use that libc
(because glibc is the usual libc in gentoo "stable" profiles)

I think it's probably best to stick with gnueabi if it's for stabilization,
but newlibc (or musl) can test embedded-type support.

the footprint of a glibc-based static-linked busybox payload
was about one megabyte (smaller than the kernel itself)

  File: armpayload-initramfs.gz
  Size: 1049413   	Blocks: 2056       IO Block: 4096   regular file