docker: tools for creating a container with Haiku cross-compilers.

* This also includes the package tool for easy use of installing
  dependencies in a container.
* Pre-built docker images are also available at
  https://hub.docker.com/r/haiku/cross-compiler/

3rdparty/docker/cross-compiler/Dockerfile

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+FROM ubuntu:16.04
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+  autoconf \
+  automake \
+  bison \
+  bzip2 \
+  ca-certificates \
+  cmake \
+  curl \
+  file \
+  flex \
+  g++ \
+  gawk \
+  git \
+  libcurl4-openssl-dev \
+  libssl-dev \
+  make \
+  nasm \
+  texinfo \
+  wget \
+  xz-utils \
+  zlib1g-dev
+
+# architectures to build
+ARG ARCHITECTURE=x86_64
+ARG SECONDARY_ARCHITECTURE=
+
+# Build Haiku cross-compiler toolchain, and haiku package tool
+WORKDIR /tmp
+COPY build-toolchain.sh /tmp/
+RUN /tmp/build-toolchain.sh $ARCHITECTURE $SECONDARY_ARCHITECTURE
+
+WORKDIR /

3rdparty/docker/cross-compiler/build-toolchain.sh

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+#!/bin/bash
+# Copyright 2016 The Rust Project Developers. See the COPYRIGHT
+# file at the top-level directory of this distribution and at
+# http://rust-lang.org/COPYRIGHT.
+#
+# Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+# http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+# <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+# option. This file may not be copied, modified, or distributed
+# except according to those terms.
+
+set -ex
+
+ARCH=$1
+SECONDARY_ARCH=$2
+
+TOP=$(pwd)
+
+BUILDTOOLS=$TOP/buildtools
+HAIKU=$TOP/haiku
+OUTPUT=/tools
+SYSROOT=$OUTPUT/cross-tools-$ARCH/sysroot
+SYSROOT_SECONDARY=$OUTPUT/cross-tools-$SECONDARY_ARCH/sysroot
+PACKAGE_ROOT=/system
+
+# First up, build a cross-compiler
+git clone --depth=1 https://git.haiku-os.org/haiku
+git clone --depth=1 https://git.haiku-os.org/buildtools
+cd $BUILDTOOLS/jam
+make && ./jam0 install
+mkdir -p $OUTPUT
+cd $OUTPUT
+configureArgs="--build-cross-tools $ARCH $TOP/buildtools"
+if [ -n "$SECONDARY_ARCH" ]; then
+	configureArgs="$configureArgs --build-cross-tools $SECONDARY_ARCH"
+fi
+$HAIKU/configure $configureArgs
+
+# Set up sysroot to redirect to /system
+mkdir -p $SYSROOT/boot
+mkdir -p $PACKAGE_ROOT
+ln -s $PACKAGE_ROOT $SYSROOT/boot/system
+if [ -n "$SECONDARY_ARCH" ]; then
+	mkdir -p $SYSROOT_SECONDARY/boot
+	ln -s $PACKAGEROOT $SYSROOT_SECONDARY/boot/system
+fi
+
+# Build needed packages and tools for the cross-compiler
+jam -q haiku.hpkg haiku_devel.hpkg '<build>package'
+if [ -n "$SECONDARY_ARCH" ]; then
+	jam -q haiku_${SECONDARY_ARCH}.hpkg haiku_${SECONDARY_ARCH}_devel.hpkg
+fi
+
+# Set up our sysroot
+cp $OUTPUT/objects/linux/lib/*.so /lib/x86_64-linux-gnu
+cp $OUTPUT/objects/linux/x86_64/release/tools/package/package /bin/
+for file in $SYSROOT/../bin/*; do
+	ln -s $file /bin/$(basename $file)
+done
+#find $SYSROOT/../bin/ -type f -exec ln -s {} /bin/ \;
+if [ -n "$SECONDARY_ARCH" ]; then
+	for file in $SYSROOT_SECONDARY/../bin/*; do
+		ln -s $file /bin/$(basename $file)-$SECONDARY_ARCH
+	done
+	#find $SYSROOT_SECONDARY/../bin/ -type f -exec ln -s {} /bin/{}-$SECONDARY_ARCH \;
+fi
+
+# Extract packages
+package extract -C $PACKAGE_ROOT $OUTPUT/objects/haiku/$ARCH/packaging/packages/haiku.hpkg
+package extract -C $PACKAGE_ROOT $OUTPUT/objects/haiku/$ARCH/packaging/packages/haiku_devel.hpkg
+if [ -n "$SECONDARY_ARCH" ]; then
+	package extract -C $PACKAGE_ROOT $OUTPUT/objects/haiku/$ARCH/packaging/packages/haiku_${SECONDARY_ARCH}.hpkg
+	package extract -C $PACKAGE_ROOT $OUTPUT/objects/haiku/$ARCH/packaging/packages/haiku_${SECONDARY_ARCH}_devel.hpkg
+fi
+find $OUTPUT/download/ -name '*.hpkg' -exec package extract -C $PACKAGE_ROOT {} \;
+cd $PACKAGE_ROOT/develop/lib
+ln -s ../../lib/libgcc_s.so libgcc_s.so
+if [ -n "$SECONDARY_ARCH" ]; then
+	cd $PACKAGE_ROOT/develop/lib/$SECONDARY_ARCH
+	ln -s ../../../lib/$SECONDARY_ARCH/libgcc_s.so libgcc_s.so
+fi
+
+# Clean up
+rm -rf $BUILDTOOLS
+rm -rf $HAIKU
+rm -rf $OUTPUT/Jamfile $OUTPUT/attributes $OUTPUT/build $OUTPUT/build_packages $OUTPUT/download $OUTPUT/objects
+
+if [ -n "$SECONDARY_ARCH" ]; then
+	echo "Cross compilers for $ARCH-unknown-haiku and $SECONDARY_ARCH-unknown-haiku built and configured"
+else
+	echo "Cross compiler for $ARCH-unknown-haiku built and configured"
+fi