rust

FROM stagex/pallet-clang
COPY --from=stagex/core-rust . /
COPY --from=stagex/core-git . /
COPY --from=stagex/core-busybox . /
COPY --from=stagex/core-libunwind . /
COPY --from=stagex/core-openssl . /
COPY --from=stagex/core-ca-certificates . /
COPY --from=stagex/core-curl . /
COPY --from=stagex/core-binutils . /
COPY --from=stagex/core-pkgconf . /

# The following MUST be done with the same version of LLVM used to build Rust
# While that would imply `core-rust` should provide these definitions, they _cannot_ be symlinks
# We can use hard links here, as we can add and export LLVM, but in `core-rust` we'd have to `cp`
RUN <<-'EOF'
	RUST_LLVM_ROOT="/usr"

	# Populate Rust's self-contained toolchain's linker
	# https://github.com/rust-lang/rust/blob/44e34e1ac6d7e69b40856cf1403d3da145319c30/src/bootstrap/src/core/build_steps/dist.rs#L581-L601
	# https://github.com/rust-lang/rust/blob/44e34e1ac6d7e69b40856cf1403d3da145319c30/src/bootstrap/src/lib.rs#L79-L80
	SELF_CONTAINED="/usr/lib/rustlib/$(uname -m)-unknown-linux-musl/bin"
	mkdir -p "${SELF_CONTAINED}"
	ln "${RUST_LLVM_ROOT}/bin/lld" "${SELF_CONTAINED}/rust-lld"
	mkdir "${SELF_CONTAINED}/gcc-ld"
	for bin in ld64.lld ld.lld lld-link wasm-ld; do
		ln "${RUST_LLVM_ROOT}/bin/${bin}" "${SELF_CONTAINED}/gcc-ld/${bin}"
	done

	# Populate Rust's self-contained LLVM tools
	# https://github.com/rust-lang/rust/blob/44e34e1ac6d7e69b40856cf1403d3da145319c30/src/bootstrap/src/core/build_steps/dist.rs#L603-L614
	ln "${RUST_LLVM_ROOT}/bin/llvm-objcopy" "${SELF_CONTAINED}/rust-objcopy"

	# Remove the legacy LLVM toolchain now that we've populated the self-contained toolchain
	if [ ! "${RUST_LLVM_ROOT}" = "/usr" ]; then
		rm -rf "${RUST_LLVM_ROOT}"
	fi
EOF

ENTRYPOINT ["/usr/bin/cargo"]