# This Docker image can change from one build to another, because the upstream
# Debian/Ubuntu package index is continuously updated and we have to run
# `apt-get update` in here.
#
# The only way to make this a part of our reproducible build system is to build
# it once, upload it to Docker Hub and make sure it's being pulled regularly so
# it's not deleted after 6 months of inactivity.

FROM ubuntu:20.04

SHELL ["/bin/bash", "-c"]

ENV DEBIAN_FRONTEND=noninteractive TZ="Etc/UTC"
RUN apt-get -qq update \
 && apt-get -qq -y install build-essential git clang-11 llvm-11-dev cmake curl libssl-dev lzma-dev libxml2-dev &>/dev/null \
 && update-alternatives --install /usr/bin/clang clang /usr/bin/clang-11 100 \
 && update-alternatives --install /usr/bin/clang++ clang++ /usr/bin/clang++-11 100 \
 && apt-get -qq clean \
 && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*

COPY "build_osxcross.sh" "/root/"
RUN cd /root \
 && ./build_osxcross.sh