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#!/bin/sh
set -e
TARGET_ARCH="$1"
SUDO_APK=abuild-apk
# optional cross build packages
KERNEL_PKG="linux-firmware linux-vanilla"
# get abuild configurables
[ -e /usr/share/abuild/functions.sh ] || (echo "abuild not found" ; exit 1)
CBUILDROOT="$(CTARGET=$TARGET_ARCH . /usr/share/abuild/functions.sh ; echo $CBUILDROOT)"
. /usr/share/abuild/functions.sh
[ -z "$CBUILD_ARCH" ] && die "abuild is too old (use 2.29.0 or later)"
[ -z "$CBUILDROOT" ] && die "CBUILDROOT not set for $TARGET_ARCH"
# deduce aports directory
[ -z "$APORTS" ] && APORTS=$(realpath $(dirname $0)/../)
[ -e "$APORTS/main/build-base" ] || die "Unable to deduce aports base checkout"
apkbuildname() {
local repo="${1%%/*}"
local pkg="${1##*/}"
[ "$repo" = "$1" ] && repo="main"
echo $APORTS/$repo/$pkg/APKBUILD
}
msg() {
[ -n "$quiet" ] && return 0
local prompt="$GREEN>>>${NORMAL}"
local name="${BLUE}bootstrap-${TARGET_ARCH}${NORMAL}"
printf "${prompt} ${name}: %s\n" "$1" >&2
}
if [ -z "$TARGET_ARCH" ]; then
local program=$(basename $0)
cat <<EOF
usage: $program TARGET_ARCH
This script creates a local cross-compiler, and uses it to
cross-compile an Alpine Linux base system for new architecture.
Steps for introducing new architecture include:
- adding the compiler tripler and arch type to abuild
- adding the arch type detection to apk-tools
- adjusting build rules for packages that are arch aware:
gcc, libressl, linux-headers
- create new kernel config for linux-vanilla
After these steps the initial cross-build can be completed
by running this with the target arch as parameter, e.g.:
./$program aarch64
EOF
return 1
fi
if [ ! -d "$CBUILDROOT" ]; then
msg "Creating sysroot in $CBUILDROOT"
mkdir -p "$CBUILDROOT/etc/apk/keys"
cp -a /etc/apk/keys/* "$CBUILDROOT/etc/apk/keys"
${SUDO_APK} add --quiet --initdb --arch $TARGET_ARCH --root $CBUILDROOT
fi
msg "Building cross-compiler"
# Build and install cross binutils (--with-sysroot)
CTARGET=$TARGET_ARCH BOOTSTRAP=nobase APKBUILD=$(apkbuildname binutils) abuild -r
if ! CHOST=$TARGET_ARCH BOOTSTRAP=nolibc APKBUILD=$(apkbuildname musl) abuild up2date 2>/dev/null; then
# C-library headers for target
CHOST=$TARGET_ARCH BOOTSTRAP=nocc APKBUILD=$(apkbuildname musl) abuild -r
# Minimal cross GCC
EXTRADEPENDS_HOST="musl-dev" \
CTARGET=$TARGET_ARCH BOOTSTRAP=nolibc APKBUILD=$(apkbuildname gcc) abuild -r
# Cross build bootstrap C-library for the target
EXTRADEPENDS_BUILD="gcc-pass2-$TARGET_ARCH" \
CHOST=$TARGET_ARCH BOOTSTRAP=nolibc APKBUILD=$(apkbuildname musl) abuild -r
fi
# Full cross GCC
EXTRADEPENDS_TARGET="musl musl-dev" \
CTARGET=$TARGET_ARCH BOOTSTRAP=nobase APKBUILD=$(apkbuildname gcc) abuild -r
# Cross build-base
CTARGET=$TARGET_ARCH BOOTSTRAP=nobase APKBUILD=$(apkbuildname build-base) abuild -r
msg "Cross building base system"
# add implicit target prerequisite packages
apk info --quiet --installed --root "$CBUILDROOT" libgcc libstdc++ musl-dev || \
${SUDO_APK} --root "$CBUILDROOT" add --repository "$REPODEST/main" libgcc libstdc++ musl-dev
# ordered cross-build
for PKG in fortify-headers linux-headers musl libc-dev pkgconf zlib \
busybox busybox-initscripts binutils make \
libressl libfetch apk-tools \
gmp mpfr3 mpc1 isl cloog gcc \
openrc alpine-conf alpine-baselayout alpine-keys alpine-base build-base \
attr libcap patch sudo acl fakeroot tar \
pax-utils abuild openssh \
ncurses util-linux lvm2 popt xz cryptsetup kmod lddtree mkinitfs \
community/go libffi testing/ghc \
$KERNEL_PKG ; do
CHOST=$TARGET_ARCH BOOTSTRAP=bootimage APKBUILD=$(apkbuildname $PKG) abuild -r
case "$PKG" in
fortify-headers | libc-dev | build-base)
# headers packages which are implicit but mandatory dependency
apk info --quiet --installed --root "$CBUILDROOT" $PKG || \
${SUDO_APK} --update --root "$CBUILDROOT" --repository "$REPODEST/main" add $PKG
;;
musl | gcc)
# target libraries rebuilt, force upgrade
[ "$(apk upgrade --root "$CBUILDROOT" --repository "$REPODEST/main" --available --simulate | wc -l)" -gt 1 ] &&
${SUDO_APK} upgrade --root "$CBUILDROOT" --repository "$REPODEST/main" --available
;;
esac
done
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