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+#
+# Docker cross-compiler target
+#
+# This docker target builds on the debian stretch base image,
+# using a prebuilt toolchains for Xtensa cores from:
+# https://github.com/foss-xtensa/toolchain/releases
+#
+FROM debian:stretch-slim
+
+RUN apt-get update && \
+ DEBIAN_FRONTEND=noninteractive apt install -yy eatmydata
+RUN DEBIAN_FRONTEND=noninteractive eatmydata \
+ apt-get install -y --no-install-recommends \
+ bison \
+ build-essential \
+ ca-certificates \
+ curl \
+ flex \
+ gettext \
+ git \
+ python-minimal
+
+ENV CPU_LIST csp dc232b dc233c
+ENV TOOLCHAIN_RELEASE 2018.02
+
+RUN for cpu in $CPU_LIST; do \
+ curl -#SL http://github.com/foss-xtensa/toolchain/releases/download/$TOOLCHAIN_RELEASE/x86_64-$TOOLCHAIN_RELEASE-xtensa-$cpu-elf.tar.gz \
+ | tar -xzC /opt; \
+ done
+
+ENV PATH $PATH:/opt/$TOOLCHAIN_RELEASE/xtensa-dc232b-elf/bin:/opt/$TOOLCHAIN_RELEASE/xtensa-dc233c-elf/bin:/opt/$TOOLCHAIN_RELEASE/xtensa-csp-elf/bin
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+# Makefile.include for xtensa targets
+
+DOCKER_IMAGE=debian-xtensa-cross
+
+# default to the dc232b cpu
+DOCKER_CROSS_COMPILER=/opt/2018.02/xtensa-dc232b-elf/bin/xtensa-dc232b-elf-gcc
+DOCKER_CROSS_LINKER=/opt/2018.02/xtensa-dc232b-elf/bin/xtensa-dc232b-elf-ld