156 lines
5.2 KiB
Bash
Executable File
156 lines
5.2 KiB
Bash
Executable File
#!/bin/sh
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set -e
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TARGET_ARCH="$1"
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SUDO_APK=abuild-apk
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# optional cross build packages
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: ${KERNEL_PKG=linux-firmware linux-lts}
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# get abuild configurables
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[ -e /usr/share/abuild/functions.sh ] || (echo "abuild not found" ; exit 1)
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CBUILDROOT="$(CTARGET=$TARGET_ARCH . /usr/share/abuild/functions.sh ; echo $CBUILDROOT)"
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. /usr/share/abuild/functions.sh
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[ -z "$CBUILD_ARCH" ] && die "abuild is too old (use 2.29.0 or later)"
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[ -z "$CBUILDROOT" ] && die "CBUILDROOT not set for $TARGET_ARCH"
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export CBUILD
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# deduce aports directory
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[ -z "$APORTS" ] && APORTS=$(realpath $(dirname $0)/../)
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[ -e "$APORTS/main/build-base" ] || die "Unable to deduce aports base checkout"
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apkbuildname() {
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local repo="${1%%/*}"
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local pkg="${1##*/}"
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[ "$repo" = "$1" ] && repo="main"
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echo $APORTS/$repo/$pkg/APKBUILD
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}
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msg() {
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[ -n "$quiet" ] && return 0
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local prompt="$GREEN>>>${NORMAL}"
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local name="${BLUE}bootstrap-${TARGET_ARCH}${NORMAL}"
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printf "${prompt} ${name}: %s\n" "$1" >&2
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}
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if [ -z "$TARGET_ARCH" ]; then
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program=$(basename $0)
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cat <<EOF
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usage: $program TARGET_ARCH
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This script creates a local cross-compiler, and uses it to
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cross-compile an Alpine Linux base system for new architecture.
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Steps for introducing new architecture include:
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- adding the compiler triplet and arch type to abuild
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- adding the arch type detection to apk-tools
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- adjusting build rules for packages that are arch aware:
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gcc, openssl, linux-headers
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- create new kernel config for linux-lts
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After these steps the initial cross-build can be completed
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by running this with the target arch as parameter, e.g.:
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./$program aarch64
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The cross-compiler generated by this script is not intended
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nor supported for any use other than building the base system
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and other packages in the bootstrap path.
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EOF
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return 1
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fi
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if [ ! -d "$CBUILDROOT" ]; then
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msg "Creating sysroot in $CBUILDROOT"
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mkdir -p "$CBUILDROOT/etc/apk/keys"
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# /etc/apk/keys and ~/.abuild/ can contain files with the same names.
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# if that is the case, cp will abort copying and fail. Then on the next
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# run of the bootstrap script, 1) the keys are not in the sysroot and
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# 2) the apk database is not initialized the sysroot
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# Thus it's unusable at that point and needs to be deleted manually.
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cp -a /etc/apk/keys/* "$CBUILDROOT/etc/apk/keys"
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cp -a ~/.abuild/*.pub "$CBUILDROOT/etc/apk/keys"
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${SUDO_APK} add --quiet --initdb --arch $TARGET_ARCH --root $CBUILDROOT
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fi
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msg "Building cross-compiler"
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# Build and install cross binutils (--with-sysroot)
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CTARGET=$TARGET_ARCH BOOTSTRAP=nobase APKBUILD=$(apkbuildname binutils) abuild -r
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if ! CHOST=$TARGET_ARCH BOOTSTRAP=nolibc APKBUILD=$(apkbuildname musl) abuild up2date 2>/dev/null; then
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# C-library headers for target
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CHOST=$TARGET_ARCH BOOTSTRAP=nocc APKBUILD=$(apkbuildname musl) abuild -r
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# Minimal cross GCC
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EXTRADEPENDS_HOST="musl-dev" \
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CTARGET=$TARGET_ARCH BOOTSTRAP=nolibc APKBUILD=$(apkbuildname gcc) abuild -r
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# Cross build bootstrap C-library for the target
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EXTRADEPENDS_BUILD="gcc-pass2-$TARGET_ARCH" \
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CHOST=$TARGET_ARCH BOOTSTRAP=nolibc APKBUILD=$(apkbuildname musl) abuild -r
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fi
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# Full cross GCC
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EXTRADEPENDS_TARGET="musl musl-dev" \
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CTARGET=$TARGET_ARCH BOOTSTRAP=nobase APKBUILD=$(apkbuildname gcc) abuild -r
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# Cross build-base
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CTARGET=$TARGET_ARCH BOOTSTRAP=nobase APKBUILD=$(apkbuildname build-base) abuild -r
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msg "Cross building base system"
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# Implicit dependencies for early targets
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EXTRADEPENDS_TARGET="libgcc libstdc++ musl-dev"
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# On a few architectures like riscv64 we need to account for
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# gcc requiring -ltomic to be set explicitly if a C[++]11 program
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# uses atomics (e.g. #include <atomic>):
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# https://github.com/riscv/riscv-gnu-toolchain/issues/183#issuecomment-253721765
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# The reason gcc itself is needed is because .so is in that package,
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# not in libatomic.
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if [ "$TARGET_ARCH" = "riscv64" ]; then
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NEEDS_LIBATOMIC="yes"
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fi
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# ordered cross-build
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for PKG in fortify-headers linux-headers musl libc-dev pkgconf zlib \
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openssl ca-certificates libmd \
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gmp mpfr4 mpc1 isl22 cloog libucontext binutils gcc \
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libbsd libretls busybox busybox-initscripts make \
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apk-tools file \
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libcap openrc alpine-conf alpine-baselayout alpine-keys alpine-base patch build-base \
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attr acl fakeroot tar \
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lzip abuild ncurses libedit openssh \
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libcap-ng util-linux libaio lvm2 popt xz \
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json-c argon2 cryptsetup zstd kmod lddtree mkinitfs \
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community/go libffi community/ghc \
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brotli libev c-ares cunit nghttp2 curl \
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pcre libssh2 community/http-parser community/libgit2 \
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libxml2 pax-utils llvm13 community/rust \
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$KERNEL_PKG ; do
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if [ "$NEEDS_LIBATOMIC" = "yes" ]; then
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EXTRADEPENDS_BUILD="libatomic gcc-$TARGET_ARCH g++-$TARGET_ARCH"
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fi
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EXTRADEPENDS_TARGET="$EXTRADEPENDS_TARGET" EXTRADEPENDS_BUILD="$EXTRADEPENDS_BUILD" \
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CHOST=$TARGET_ARCH BOOTSTRAP=bootimage APKBUILD=$(apkbuildname $PKG) abuild -r
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case "$PKG" in
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fortify-headers | libc-dev)
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# Additional implicit dependencies once built
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EXTRADEPENDS_TARGET="$EXTRADEPENDS_TARGET $PKG"
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;;
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gcc)
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if [ "$NEEDS_LIBATOMIC" = "yes" ]; then
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EXTRADEPENDS_TARGET="libatomic gcc $EXTRADEPENDS_TARGET"
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fi
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;;
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build-base)
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# After build-base, that alone is sufficient dependency in the target
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EXTRADEPENDS_TARGET="busybox $PKG"
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;;
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esac
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done
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