tests/docker: add debian-xtensa-cross image

Xtensa cpu supported:
- dc232b
- dc233c
- csp

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>

tests/docker/dockerfiles/debian-xtensa-cross.docker

@@ -0,0 +1,31 @@
+#
+# 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

tests/tcg/xtensa/Makefile.include

@@ -0,0 +1,11 @@
+# Makefile.include for xtensa targets
+#
+# The compilers can only be used for building system tests
+
+ifeq ($(CONFIG_SOFTMMU),y)
+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
+endif