§2023-09-06

  1. Using surfacePro to create a disk image holding cross-compiler
$ dd if=/dev/zero of=gentoo-32G-x86_64-systemd-2023-09-06.img bs=1M count=32768
$ sudo losetup -f
[sudo] alexlai のパスワード: 
/dev/loop13
$ sudo losetup /dev/loop13 gentoo-32G-x86_64-systemd-2023-09-06.img
$ sudo fdisk /dev/loop13, as
デバイス      起動 開始位置 最後から   セクタ サイズ Id タイプ
/dev/loop13p1          2048  1050623  1048576   512M  c W95 FAT32 (LBA)
/dev/loop13p2       1050624 67108863 66058240  31.5G 83 Linux

$ sudo partprobe /dev/loop13　　<--- !!!!
$ lsblk /dev/loop13
NAME       MAJ:MIN RM  SIZE RO TYPE MOUNTPOINTS
loop13       7:13   0   32G  0 loop 
├─loop13p1 259:6    0  512M  0 part 
└─loop13p2 259:7    0 31.5G  0 part 
$ sudo mkfs.vfat -F 32 /dev/loop13p1
mkfs.fat 4.2 (2021-01-31)
$ sudo mkfs.ext4 /dev/loop13p2

$ wget https://distfiles.gentoo.org/releases/amd64/autobuilds/20230903T170202Z/stage3-amd64-systemd-20230903T170202Z.tar.xz

$ sudo mount /dev/loop13p2 root
$ sudo tar xvpf stage3-amd64-systemd-20230903T170202Z.tar.xz -C root

$ sudo arch-chroot root /bin/bash
SurfacePro / # source /etc/profile
SurfacePro / # export PS1="(chroot) $PS1"
(chroot) SurfacePro / #
(chroot) SurfacePro / # nano /etc/resolv.conf
# as
nameserver 8.8.8.8
nameserver 8.8.4.4
##
(chroot) SurfacePro / # ping google.com
PING google.com (142.251.43.14) 56(84) bytes of data.
64 bytes from tsa03s08-in-f14.1e100.net (142.251.43.14): icmp_seq=1 ttl=115 time=4.53 ms
64 bytes from tsa03s08-in-f14.1e100.net (142.251.43.14): icmp_seq=2 ttl=115 time=4.74 ms
64 bytes from tsa03s08-in-f14.1e100.net (142.251.43.14): icmp_seq=3 ttl=115 time=4.53 ms
^C
(chroot) SurfacePro / # nano /etc/locale.gen
# uncomment
en_US.UTF-8 UTF-8
#
(chroot) SurfacePro / # locale-gen
 * Generating 2 locales (this might take a while) with 4 jobs
 *  (2/2) Generating C.UTF-8 ...                                                                                                                [ ok ]
 *  (1/2) Generating en_US.UTF-8 ...                                                                                                            [ ok ]
 * Generation complete
 * Adding locales to archive ...

# /etc/profile: login shell setup
#
# That this file is used by any Bourne-shell derivative to setup the
# environment for login shells.
#

# Load environment settings from profile.env, which is created by
# env-update from the files in /etc/env.d
if [ -e /etc/profile.env ] ; then
	. /etc/profile.env
fi

# You should override these in your ~/.bashrc (or equivalent) for per-user
# settings.  For system defaults, you can add a new file in /etc/profile.d/.
export EDITOR=${EDITOR:-/bin/nano}
export PAGER=${PAGER:-/usr/bin/less}

unset ROOTPATH

# process *.sh files in /etc/profile.d
for sh in /etc/profile.d/*.sh ; do
	[ -r "$sh" ] && . "$sh"
done
unset sh

if [ -n "${BASH_VERSION-}" ] ; then
	# Newer bash ebuilds include /etc/bash/bashrc which will setup PS1
	# including color.  We leave out color here because not all
	# terminals support it.
	if [ -f /etc/bash/bashrc ] ; then
		# Bash login shells run only /etc/profile
		# Bash non-login shells run only /etc/bash/bashrc
		# Since we want to run /etc/bash/bashrc regardless, we source it
		# from here.  It is unfortunate that there is no way to do
		# this *after* the user's .bash_profile runs (without putting
		# it in the user's dot-files), but it shouldn't make any
		# difference.
		. /etc/bash/bashrc
	else
		PS1='\u@\h \w \$ '
	fi
else
	# Setup a bland default prompt.  Since this prompt should be useable
	# on color and non-color terminals, as well as shells that don't
	# understand sequences such as \h, don't put anything special in it.
	PS1="${USER:-$(whoami 2>/dev/null)}@$(uname -n 2>/dev/null) \$ "
fi

# export LANG, LC_ALL 
export LANG=en_US.UTF-8
# LANG is the primary environmental variable that sets the default locale for your system.
export LC_ALL=C.UTF-8
# LC_ALL is another environmental variable that can override the settings of LANG and other LC_* variables for all locale categories.
# 

# PS1
export PS1="(chroot) $PS1" # or PS1="(rpi3Chr) $PS1" to idicating building for rpi3

(chroot) SurfacePro / # source /etc/profile
(chroot) SurfacePro / # ln -sf /usr/share/zoneinfo/Asia/Taipei /etc/localtime
(chroot) SurfacePro / # date
Wed Sep  6 14:05:03 CST 2023

¶2. /etc/portage/repos.conf/gentoo.conf

[gentoo]
location = /var/db/repos/gentoo
sync-type = rsync
sync-uri = rsync://rsync.namerica.gentoo.org/gentoo-portage
auto-sync = yes
priority = 10

¶3. /etc/portage/make.conf,( targeted rpi3, 64bits)

# These settings were set by the catalyst build script that automatically
# built this stage.
# Please consult /usr/share/portage/config/make.conf.example for a more
# detailed example.
COMMON_FLAGS="-O2 -pipe"
CFLAGS="${COMMON_FLAGS}"
CXXFLAGS="${COMMON_FLAGS}"
FCFLAGS="${COMMON_FLAGS}"
FFLAGS="${COMMON_FLAGS}"

# WARNING: Changing your CHOST is not something that should be done lightly.
# Please consult https://wiki.gentoo.org/wiki/Changing_the_CHOST_variable before changing.
# CHOST="aarch64-unknown-linux-gnu"
# to be able to `crossdev -t aarch64-unknown-linux-gnu --ov-output /opt/toolchains/`
# error messages:
# * Refusing to create a cross-compiler using the same
# * target name as your host utils.
# you have to comment `CHOST="aarch64-unknown-linux-gnu"`

# NOTE: This stage was built with the bindist Use flag enabled


# This sets the language of build output to English.
# Please keep this setting intact when reporting bugs.
LC_MESSAGES=C.utf8

# Pi3 users (or Pi4 users with a 1GiB variant) should be
# less aggressive here
MAKEOPTS="-j4"

¶6. emerge-webrsync

¶7. emerge --ask --verbose --update --deep --newuse @world

¶8. emerge --ask sys-devel/crossdev

emerge --ask sys-devel/crossdev

¶9. set up cross-dev ENV

# ls /var/db/repos/
gentoo
# mkdir -p /var/db/repos/crossdev/{profiles,metadata}
# echo 'crossdev' > /var/db/repos/crossdev/profiles/repo_name
# echo 'masters = gentoo' > /var/db/repos/crossdev/metadata/layout.conf
# chown -R portage:portage /var/db/repos/crossdev

If the Gentoo ebuild repository is synchronized using Git, or any other method with Manifest files that do not include checksums for ebuilds, prevent "masked by: corruption" errors with:

masters = gentoo
thin-manifests = true

# ls /etc/portage/repos.conf/crossdev.conf
ls: cannot access '/etc/portage/repos.conf/crossdev.conf': No such file or directory
# nano /etc/portage/repos.conf/crossdev.conf # as follows

[crossdev]
location = /var/db/repos/crossdev
priority = 10
masters = gentoo
auto-sync = no

¶ 10 crossdev -t aarch64-unknown-linux-gnu

¶ 11, Test

(chroot) SurfacePro / # gcc-config -l
 [1] aarch64-unknown-linux-gnu-13 *

 [2] x86_64-pc-linux-gnu-12 *
(chroot) SurfacePro / # aarch64-unknown-linux-gnu-gcc --version
aarch64-unknown-linux-gnu-gcc (Gentoo 13.2.1_p20230826 p7) 13.2.1 20230826
Copyright (C) 2023 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.