cross 0.2.3

Zero setup cross compilation and cross testing
Documentation
FROM ubuntu:18.04
ARG DEBIAN_FRONTEND=noninteractive

COPY common.sh lib.sh /
RUN /common.sh

COPY cmake.sh /
RUN /cmake.sh

COPY xargo.sh /
RUN /xargo.sh

ARG VERBOSE
COPY crosstool-ng.sh /
COPY crosstool-config/arm-unknown-linux-gnueabihf.config /
RUN /crosstool-ng.sh arm-unknown-linux-gnueabihf.config 5

ENV PATH /x-tools/arm-unknown-linux-gnueabihf/bin/:$PATH

COPY qemu.sh /
RUN /qemu.sh arm

COPY qemu-runner /

ENV CARGO_TARGET_ARM_UNKNOWN_LINUX_GNUEABIHF_LINKER=arm-unknown-linux-gnueabihf-gcc \
    CARGO_TARGET_ARM_UNKNOWN_LINUX_GNUEABIHF_RUNNER="/qemu-runner arm" \
    CC_arm_unknown_linux_gnueabihf=arm-unknown-linux-gnueabihf-gcc \
    CXX_arm_unknown_linux_gnueabihf=arm-unknown-linux-gnueabihf-g++ \
    BINDGEN_EXTRA_CLANG_ARGS_arm_unknown_linux_gnueabihf="--sysroot=/x-tools/arm-unknown-linux-gnueabihf/arm-unknown-linux-gnueabihf/sysroot/" \
    QEMU_LD_PREFIX=/x-tools/arm-unknown-linux-gnueabihf/arm-unknown-linux-gnueabihf/sysroot/ \
    RUST_TEST_THREADS=1