#!/bin/sh

set -e

target=$1

ln -s /var/db/repos/gentoo/sys-devel/rust-std /var/db/repos/crossdev/cross-${target}/

case ${target%%-*} in
aarch64)
    llvm_target=AArch64
    ;;
arm*)
    llvm_target=ARM
    ;;
*)
    printf 'Unknown LLVM target: %s' "${target%%-*}"
    exit 1
    ;;
esac

mkdir -p \
    /etc/portage/env/dev-lang \
    /etc/portage/package.accept_keywords \
    /etc/portage/package.use \
    && :
printf 'cross-%s/rust-std **\n' "${target}" \
    > /etc/portage/package.accept_keywords/rust-cross
printf 'dev-lang/rust rust-src LLVM_TARGETS: %s\n' \
    "${llvm_target}" \
    > /etc/portage/package.use/rust-src
printf 'RUST_CROSS_TARGETS=( %s:%s:%s )\n' \
    "${llvm_target}" \
    "${target}" \
    "${target}" \
    >> /etc/portage/env/dev-lang/rust
emerge -vbknj cross-${target}/rust-std