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[Qemu-devel] [PATCH v2 20/21] docker: add linux-user powered cross build

From: Alex Bennée
Subject: [Qemu-devel] [PATCH v2 20/21] docker: add linux-user powered cross builder for QEMU
Date: Fri, 29 Jun 2018 21:52:31 +0100

We can't use cross compilers in the current Debian stable and Debian
sid is sketchy as hell. So for powerpc fall back to dog-fooding our
own linux-user to do the build.

As we can only build the base image with a suitably configured
source tree we fall back to checking for it's existence when we can't
build it from scratch. However this does mean you don't have to keep
a static powerpc-linux-user in your active configuration just to
update the cross build image.

Signed-off-by: Alex Bennée <address@hidden>
 tests/docker/Makefile.include                 | 28 +++++++++++++++++++
 .../debian-powerpc-user-cross.docker          | 13 +++++++++
 2 files changed, 41 insertions(+)
 create mode 100644 tests/docker/dockerfiles/debian-powerpc-user-cross.docker

diff --git a/tests/docker/Makefile.include b/tests/docker/Makefile.include
index d3bd2f57dd..556b260fad 100644
--- a/tests/docker/Makefile.include
+++ b/tests/docker/Makefile.include
@@ -118,6 +118,30 @@ docker-image-travis: NOUSER=1
 # Specialist build images, sometimes very limited tools
 docker-image-tricore-cross: docker-image-debian9
+# Rules for building linux-user powered images
+# These are slower than using native cross compiler setups but can
+# work around issues with poorly working multi-arch systems and broken
+# packages.
+ifeq ($(filter ppc-linux-user,$(TARGET_LIST))$(CONFIG_STATIC),ppc-linux-usery)
+# Jessie is the last supported release for powerpc, but multi-arch is
+# broken so we need a qemu-linux-user for this target
+docker-image-debian-powerpc-user: DEB_ARCH = powerpc
+docker-image-debian-powerpc-user: DEB_TYPE = jessie
+docker-image-debian-powerpc-user: EXECUTABLE = 
+DOCKER_USER_IMAGES += debian-powerpc-user
+       $(call quiet-command, \
+               $(DOCKER_SCRIPT) check --quiet qemu:debian-powerpc-user \
+                       $(DOCKER_FILES_DIR)/debian-bootstrap.docker, \
+               "CHECK", "debian-powerpc-user exists")
+docker-image-debian-powerpc-user-cross: docker-image-debian-powerpc-user
 # Expand all the pre-requistes for each docker image and test combination
 $(foreach i,$(filter-out $(DOCKER_INTERMEDIATE_IMAGES),$(DOCKER_IMAGES) 
        $(foreach t,$(DOCKER_TESTS) $(DOCKER_TOOLS), \
@@ -153,6 +177,10 @@ docker:
        @echo 'Available container images:'
        @echo '    $(DOCKER_IMAGES)'
+       @echo 'Available linux-user images:'
+       @echo '    $(DOCKER_USER_IMAGES)'
        @echo 'Available tests:'
        @echo '    $(DOCKER_TESTS)'
diff --git a/tests/docker/dockerfiles/debian-powerpc-user-cross.docker 
new file mode 100644
index 0000000000..eadb142792
--- /dev/null
+++ b/tests/docker/dockerfiles/debian-powerpc-user-cross.docker
@@ -0,0 +1,13 @@
+# Docker powerpc cross-compiler target for QEMU
+# We can't use current Debian stable cross-compilers to build powerpc
+# as it has been dropped as a release architecture. Using Debian Sid
+# is just far too sketchy a build environment. This leaves us the
+# final option of using linux-user. This image is based of the
+# debootstrapped qemu:debian-powerpc-user but doesn't need any extra
+# magic once it is setup.
+FROM qemu:debian-powerpc-user
+RUN apt-get update && apt-get build-dep -yy qemu

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