[Pkg-rust-maintainers] Bug#881846: build for armel

[Marco A L Barbosa]

After https://github.com/rust-lang/rust/pull/47018 got merged I was able to
cross build to armel (but not tested) using this docker file

FROM ubuntu:17.10

RUN apt-get update && apt-get install -y --no-install-recommends \
  g++ \
  make \
  file \
  curl \
  ca-certificates \
  python2.7 \
  git \
  cmake \
  sudo \
  xz-utils \
  zlib1g-dev \
  g++-arm-linux-gnueabi \
  bzip2 \
  patch \
  libssl-dev \
  pkg-config

WORKDIR /tmp

ENV TARGETS=armv4t-unknown-linux-gnueabi

RUN echo "#!/bin/sh\narm-linux-gnueabi-gcc -Wl,--allow-multiple-definition
\"\$@\"" > /usr/bin/arm-linux-gnueabi-gcc2
RUN chmod +x /usr/bin/arm-linux-gnueabi-gcc2
RUN cat /usr/bin/arm-linux-gnueabi-gcc2

ENV CC_armv4t_unknown_linux_gnueabi=arm-linux-gnueabi-gcc2 \
    CFLAGS_armv4t_unknown_linux_gnueabi="-march=armv4t -marm
-mfloat-abi=soft" \
    CXX_armv4t_unknown_linux_gnueabi=arm-linux-gnueabi-g++ \
    CXXFLAGS_armv4t_unknown_linux_gnueabi="-march=armv4t -marm
-mfloat-abi=soft"

# Suppress some warnings in the openwrt toolchains we downloaded
ENV STAGING_DIR=/tmp

ENV RUST_CONFIGURE_ARGS \
      --target=$TARGETS \
      --host=$TARGETS
ENV SCRIPT python2.7 ../x.py dist --host $TARGETS --target $TARGETS

# sccache
COPY scripts/sccache.sh /scripts/
RUN sh /scripts/sccache.sh


Ubuntu 17.10 was necessary because it has a recent gcc (with fix for
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=727621)

--allow-multiple-definition hack was necessary because function
__sync_fetch_and_add_4 (and similar) is defined in libgcc and
compiler_builtins (
https://github.com/rust-lang-nursery/compiler-builtins/pull/115)

-- 
Marco A L Barbosa
http://malbarbo.pro.br
--
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