Dockerfile for Rust cross compilation to aarch64

gistfile1.txt

FROM rust:1.37.0

ENV TARGET="aarch64-unknown-linux-musl"

ARG LIBRESSL=libressl-3.0.2

ARG TOOLCHAIN_AARCH64="aarch64--musl--stable-2018.11-1"
ARG TC_AARCH64_URL="https://toolchains.bootlin.com/downloads/releases/toolchains/aarch64/tarballs/${TOOLCHAIN_AARCH64}.tar.bz2"

ARG DEBIAN_FRONTEND=noninteractive
RUN apt -y update && \
    apt -y upgrade && \
    apt -y install \
        bison\
        flex \
        protobuf-compiler

RUN rustup target add ${TARGET}
COPY cargo.config "${CARGO_HOME}/config"

WORKDIR /opt
RUN curl -o- ${TC_AARCH64_URL} | tar -xjf -

ENV PATH="${PATH}:/opt/${TOOLCHAIN_AARCH64}/bin"

ENV CC_aarch64_unknown_linux_musl=aarch64-buildroot-linux-musl-gcc
ENV CXX_aarch64_unknown_linux_musl=aarch64-buildroot-linux-musl-g++
ENV LD_aarch64_unknown_linux_musl=aarch64-buildroot-linux-musl-ld

WORKDIR /work

COPY sigs/* ./
RUN gpg --no-tty --import libressl.asc

RUN curl -fO https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/${LIBRESSL}.tar.gz && \
    gpg --no-tty --verify ${LIBRESSL}.tar.gz.asc ${LIBRESSL}.tar.gz && \
    tar zxf ${LIBRESSL}.tar.gz && \
    cd ${LIBRESSL} && \
    CC=${CC_aarch64_unknown_linux_musl} \
    CXX=${CXX_aarch64_unknown_linux_musl} \
    LD=${LD_aarch64_unknown_linux_musl} \
    ./configure --prefix=/opt/libressl --host=aarch64-linux-musl --enable-shared=no --sysconfdir=/etc && \
    make V=1 -j4 && \
    make install

ENV AARCH64_UNKNOWN_LINUX_MUSL_OPENSSL_LIB_DIR=/opt/libressl/lib
ENV AARCH64_UNKNOWN_LINUX_MUSL_OPENSSL_INCLUDE_DIR=/opt/libressl/include

WORKDIR /

Also for cargo.config file:

[target.aarch64-unknown-linux-musl]
linker = "aarch64-buildroot-linux-musl-gcc"
rustflags = [ "-C", "target-feature=+crt-static", "-C", "link-arg=-lgcc" ]