tests/tcg: enable building for Alpha

We can't use our normal Debian based compilers as Alpha isn't an
officially supported architecture. However it is available as a port
and fortunately cross compilers for all these targets are included in
Debian Sid, the perpetual rolling/unstable/testing version of Debian.
Signed-off-by: NAlex Bennée <alex.bennee@linaro.org>
Reviewed-by: NPhilippe Mathieu-Daudé <f4bug@amsat.org>
Tested-by: NPhilippe Mathieu-Daudé <f4bug@amsat.org>

tests/docker/Makefile.include

@@ -64,6 +64,13 @@ docker-image-debian-ppc64el-cross: docker-image-debian9
 docker-image-debian-s390x-cross: docker-image-debian9
 docker-image-debian-win32-cross: docker-image-debian8-mxe
 docker-image-debian-win64-cross: docker-image-debian8-mxe
+
+# Debian SID images - we are tracking a rolling distro so we want to
+# force a re-build of the base image if we ever need to build one of
+# its children.
+docker-image-debian-sid: NOCACHE=1
+
+docker-image-debian-alpha-cross: docker-image-debian-sid
 docker-image-travis: NOUSER=1
 
 # Specialist build images, sometimes very limited tools

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

+#
+# Docker cross-compiler target
+#
+# This docker target builds on the debian sid base image which
+# contains cross compilers for Debian "ports" targets.
+#
+FROM qemu:debian-sid
+
+RUN DEBIAN_FRONTEND=noninteractive eatmydata \
+    apt-get install -y --no-install-recommends \
+        gcc-alpha-linux-gnu \
+        libc6.1-dev-alpha-cross || { echo "Failed to build - see debian-sid.docker notes"; exit 1; }

tests/docker/dockerfiles/debian-sid.docker

+#
+# Debian Sid Base
+#
+# A number of our guests exist as ports only. We can either use the
+# ports repo or get everything from Sid. However Sid is a rolling
+# distro which may be broken at any particular time. If you are
+# unlucky and try and build your images while gcc is in the process of
+# being uploaded this can fail. Your only recourse is to try again in
+# a few hours when the repos have re-synced. Once built however you
+# won't be affected by repo changes unless the docker recipies are
+# updated and trigger a re-build.
+#
+
+FROM debian:sid-slim
+
+# Duplicate deb line as deb-src
+RUN cat /etc/apt/sources.list | sed "s/^deb\ /deb-src /" >> /etc/apt/sources.list
+
+# Install common build utilities
+RUN apt update
+RUN DEBIAN_FRONTEND=noninteractive apt install -yy eatmydata
+RUN DEBIAN_FRONTEND=noninteractive eatmydata \
+    apt install -y --no-install-recommends \
+        bison \
+        build-essential \
+        ca-certificates \
+        flex \
+        git \
+        pkg-config \
+        psmisc \
+        python \
+        texinfo || { echo "Failed to build - see debian-sid.docker notes"; exit 1; }

tests/tcg/alpha/Makefile.include

+DOCKER_IMAGE=debian-alpha-cross
+DOCKER_CROSS_COMPILER=alpha-linux-gnu-gcc

tests/tcg/alpha/Makefile.target

+# -*- Mode: makefile -*-
+#
+# Alpha specific tweaks
+
+# On Alpha Linux only supports 8k pages
+EXTRA_RUNS+=run-test-mmap-8192