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|
#!/bin/sh
set -e
TARGET_ARCH="$1"
SUDO_APK=abuild-apk
# optional cross build packages
: ${KERNEL_PKG=linux-firmware linux-lts}
# get abuild configurables
[ -e /usr/share/abuild/functions.sh ] || (echo "abuild not found" ; exit 1)
CBUILDROOT="$(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 $TARGET_ARCH"
export CBUILD
# deduce aports directory
[ -z "$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
program=$(basename $0)
cat <<EOF
usage: $program TARGET_ARCH
This script creates a local cross-compiler, and uses it to
cross-compile an Alpine Linux base system for new architecture.
Steps for introducing new architecture include:
- adding the compiler triplet and arch type to abuild
- adding the arch type detection to apk-tools
- adjusting build rules for packages that are arch aware:
gcc, openssl, linux-headers
- create new kernel config for linux-lts
After these steps the initial cross-build can be completed
by running this with the target arch as parameter, e.g.:
./$program aarch64
The cross-compiler generated by this script is not intended
nor supported for any use other than building the base system
and other packages in the bootstrap path.
EOF
return 1
fi
if [ ! -d "$CBUILDROOT" ]; then
msg "Creating sysroot in $CBUILDROOT"
mkdir -p "$CBUILDROOT/etc/apk/keys"
# /etc/apk/keys and ~/.abuild/ can contain files with the same names.
# if that is the case, cp will abort copying and fail. Then on the next
# run of the bootstrap script, 1) the keys are not in the sysroot and
# 2) the apk database is not initialized the sysroot
# Thus it's unusable at that point and needs to be deleted manually.
cp -a /etc/apk/keys/* "$CBUILDROOT/etc/apk/keys"
cp -a ~/.abuild/*.pub "$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"
# Implicit dependencies for early targets
EXTRADEPENDS_TARGET="libgcc libstdc++ musl-dev"
# On a few architectures like riscv64 we need to account for
# gcc requiring -ltomic to be set explicitly if a C[++]11 program
# uses atomics (e.g. #include <atomic>):
# https://github.com/riscv/riscv-gnu-toolchain/issues/183#issuecomment-253721765
# The reason gcc itself is needed is because .so is in that package,
# not in libatomic.
if [ "$TARGET_ARCH" = "riscv64" ]; then
NEEDS_LIBATOMIC="yes"
fi
# ordered cross-build
for PKG in fortify-headers linux-headers musl libc-dev pkgconf zlib \
openssl openssl1.1-compat ca-certificates libmd \
gmp mpfr4 mpc1 isl22 cloog libucontext binutils gcc \
libbsd libretls busybox busybox-initscripts make \
apk-tools file \
openrc alpine-conf alpine-baselayout alpine-keys alpine-base patch build-base \
attr libcap acl fakeroot tar \
lzip abuild ncurses libedit openssh \
libcap-ng util-linux libaio lvm2 popt xz \
json-c argon2 cryptsetup zstd kmod lddtree mkinitfs \
community/go libffi community/ghc \
brotli libev c-ares cunit nghttp2 curl \
pcre libssh2 community/http-parser community/libgit2 \
libxml2 pax-utils llvm11 community/rust \
$KERNEL_PKG ; do
if [ "$NEEDS_LIBATOMIC" = "yes" ]; then
EXTRADEPENDS_BUILD="libatomic gcc-$TARGET_ARCH g++-$TARGET_ARCH"
fi
EXTRADEPENDS_TARGET="$EXTRADEPENDS_TARGET" EXTRADEPENDS_BUILD="$EXTRADEPENDS_BUILD" \
CHOST=$TARGET_ARCH BOOTSTRAP=bootimage APKBUILD=$(apkbuildname $PKG) abuild -r
case "$PKG" in
fortify-headers | libc-dev)
# Additional implicit dependencies once built
EXTRADEPENDS_TARGET="$EXTRADEPENDS_TARGET $PKG"
;;
gcc)
if [ "$NEEDS_LIBATOMIC" = "yes" ]; then
EXTRADEPENDS_TARGET="libatomic gcc $EXTRADEPENDS_TARGET"
fi
;;
build-base)
# After build-base, that alone is sufficient dependency in the target
EXTRADEPENDS_TARGET="busybox $PKG"
;;
esac
done
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