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eclass/coreos-cargo: Add eclass for cross-compiling with cargo

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This should be a drop-in replacement for cargo.eclass.
This commit is contained in:
David Michael 2017-09-11 11:20:51 -07:00
parent a0ff1d9102
commit 70da76fbde
1 changed files with 77 additions and 0 deletions
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sdk_container/src/third_party/coreos-overlay/eclass/coreos-cargo.eclass vendored Normal file
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# Copyright 2017 CoreOS, Inc.
# Distributed under the terms of the GNU General Public License v2
# @ECLASS: coreos-cargo.eclass
# @MAINTAINER:
# team-os@coreos.com
# @AUTHOR:
# David Michael <david.michael@coreos.com>
# @BLURB: cargo cross-compilation support for CoreOS/ChromeOS targets
if [[ -z ${_COREOS_CARGO_ECLASS} ]]; then
_COREOS_CARGO_ECLASS=1
# XXX: Don't require host dependencies to also be in the sysroot.
CATEGORY=dev-util PN=cargo inherit cargo
inherit toolchain-funcs
EXPORT_FUNCTIONS src_unpack
[[ ${CATEGORY}/${PN} != dev-libs/rustlib ]] && DEPEND="|| (
dev-libs/rustlib
dev-util/cargo
)"
# @FUNCTION: coreos-cargo_src_unpack
# @DESCRIPTION:
# This amends the src_unpack from cargo.eclass to add support for Rust
# cross-compiling to the ChromeOS targets. It maps the host triplet to
# one built into rustc and uses the board root as its sysroot.
coreos-cargo_src_unpack() {
debug-print-function ${FUNCNAME} "$@"
cargo_src_unpack "$@"
[[ ${CBUILD:-${CHOST}} != ${CHOST} ]] || return 0
# Define the cross-compilers for rust-gcc commands.
export TARGET_AR="$(tc-getAR)"
export TARGET_CC="$(tc-getCC)"
export TARGET_CFLAGS="${CFLAGS}"
export TARGET_CXX="$(tc-getCXX)"
export TARGET_CXXFLAGS="${CXXFLAGS}"
# Map the SDK host triplet to one that is built into rustc.
function rust_builtin_target() case "$1" in
aarch64-*-linux-gnu) echo aarch64-unknown-linux-gnu ;;
x86_64-*-linux-gnu) echo x86_64-unknown-linux-gnu ;;
*) die "Unknown host triplet: $1" ;;
esac
# Allow searching host libraries when targeting incompatible systems.
export RUST_TARGET=$(rust_builtin_target "${CHOST}")
local build_triplet=$(rust_builtin_target "${CBUILD}")
[[ ${RUST_TARGET} = ${build_triplet} ]] ||
local crossflags="-L /usr/lib64/rustlib/${build_triplet}/lib"
# Create a compiler wrapper to work around rust-lang/cargo#4456.
if [[ ${CATEGORY}/${PN} != dev-libs/rustlib ]]; then
cat <<- EOF > "${T}/wrustc" && chmod 0755 "${T}/wrustc"
#!/bin/sh
exec rustc --sysroot="${ROOT:-/}usr" ${crossflags-} "\$@"
EOF
export RUSTC="${T}/wrustc"
fi
# Compile for the built-in target, using the SDK cross-tools.
cat <<- EOF >> "${ECARGO_HOME}/config"
[build]
target = "${RUST_TARGET}"
[target.${RUST_TARGET}]
ar = "${TARGET_AR}"
linker = "${TARGET_CC}"
EOF
}
fi