[libvirt] [jenkins-ci PATCH] Add support for cross compiling libvirt via Debian

[Daniel P. Berrangé]

Debian's filesystem layout has a nice advantage over Fedora which is
that it can install non-native RPMs in the main root filesystem. It is
thus possible to prepare an x86_64 filesystem containing -dev packages
for a foreign architecture, along with a GCC cross compiler.

QEMU has used this technique to facilitate developer build testing of
non-x86 architectures, since few people have access to physical
hardware for most of these architectures. For the same reason it would
be helpful to libvirt developers.

This docker file allows creation of containers  buildenv-cross-$ARCH
for arm64, armel, armhf, mips, mipsel, mips64el, ppc64el, s390x, based
off Debian 9, in which libvirt can be cross-compiled. Debian can support
further architectures, but only by using the unstable 'sid' repos. This
does not enable use of 'sid' but it could be added fairly easily at a
later date if desired. Most of the other architectures are fairly
old & obscure, the main interesting exception being riscv64.

If qemu-user emulators are registered with the kernel binfmt, then it
is theoretically possible to run "make check" tool, though this has not
been tested.

Signed-off-by: Daniel P. Berrangé <berrange at redhat.com>
---
 .gitignore                           |  1 +
 cross-build/arch-config.csv          |  8 +++
 cross-build/buildenv-cross.docker.in | 96 ++++++++++++++++++++++++++++
 3 files changed, 105 insertions(+)
 create mode 100644 cross-build/arch-config.csv
 create mode 100644 cross-build/buildenv-cross.docker.in

diff --git a/.gitignore b/.gitignore
index b25c15b..4884352 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 *~
+cross-build/*docker
diff --git a/cross-build/arch-config.csv b/cross-build/arch-config.csv
new file mode 100644
index 0000000..36fcb5f
--- /dev/null
+++ b/cross-build/arch-config.csv
@@ -0,0 +1,8 @@
+arm64,crossbuild-essential-arm64,aarch64-linux-gnu
+armel,crossbuild-essential-armel,arm-linux-gnueabi
+armhf,crossbuild-essential-armhf,arm-linux-gnueabihf
+mips64el,gcc-mips64el-linux-gnuabi64,mips64el-linux-gnuabi64
+mips,gcc-mips-linux-gnu,mips-linux-gnu
+mipsel,gcc-mipsel-linux-gnu,mipsel-linux-gnu
+ppc64el,crossbuild-essential-ppc64el,powerpc64le-linux-gnu
+s390x,gcc-multilib-s390x-linux-gnu,s390x-linux-gnu
diff --git a/cross-build/buildenv-cross.docker.in b/cross-build/buildenv-cross.docker.in
new file mode 100644
index 0000000..97a9e69
--- /dev/null
+++ b/cross-build/buildenv-cross.docker.in
@@ -0,0 +1,96 @@
+#
+# ::ARCH:: cross-compiler target
+#
+FROM debian:stretch-slim
+
+# Grab the updated list of packages
+RUN apt update && apt dist-upgrade -yy
+
+# First some common native binaries. Any program that the
+# build will execute needs to have a native binary package
+# installed. We don't want to rely on qemu-user emulation
+# for executing non-native binaries as that is slow & flaky
+RUN DEBIAN_FRONTEND=noninteractive  \
+    apt-get install -y --no-install-recommends \
+        git \
+        build-essential \
+        ca-certificates \
+        libtool\
+        autoconf \
+        automake \
+        python3 \
+        xsltproc \
+        parted \
+        radvd \
+        qemu-system-common \
+        dwarves \
+        libxml2-utils \
+        dnsmasq-base \
+        openssh-client \
+        netcat-openbsd \
+        ebtables \
+        iptables \
+        sheepdog \
+        qemu-utils \
+        qemu-system-x86 \
+        pkg-config
+
+
+# Add the ::ARCH:: architecture
+RUN dpkg --add-architecture ::ARCH::
+
+
+# Grab the freshly updated list of packages
+RUN apt update
+
+
+# Pull in the native package for the cross-compiler
+RUN DEBIAN_FRONTEND=noninteractive  \
+    apt-get install -y --no-install-recommends \
+        ::COMPILER::
+
+# Finally pull in the foreign architecture library
+# packages that we're going to link against. Everything
+# here should be a -dev package. Binaries belong earlier
+RUN DEBIAN_FRONTEND=noninteractive  \
+    apt-get install -y --no-install-recommends \
+        libxml2-dev:::ARCH:: \
+        libncurses5-dev:::ARCH:: \
+        libreadline-dev:::ARCH:: \
+        zlib1g-dev:::ARCH:: \
+        libgcrypt20-dev:::ARCH:: \
+        libgnutls28-dev:::ARCH:: \
+        libavahi-client-dev:::ARCH:: \
+        libsasl2-dev:::ARCH:: \
+        libparted-dev:::ARCH:: \
+        libdevmapper-dev:::ARCH:: \
+        uuid-dev:::ARCH:: \
+        libudev-dev:::ARCH:: \
+        libpciaccess-dev:::ARCH:: \
+        libpolkit-gobject-1-dev:::ARCH:: \
+        libcap-ng-dev:::ARCH:: \
+        libnl-3-dev:::ARCH:: \
+        libnl-route-3-dev:::ARCH:: \
+        libyajl-dev:::ARCH:: \
+        libpcap0.8-dev:::ARCH:: \
+        libsanlock-dev:::ARCH:: \
+        libaudit-dev:::ARCH:: \
+        libselinux1-dev:::ARCH:: \
+        libapparmor-dev:::ARCH:: \
+        libdbus-1-dev:::ARCH:: \
+        librbd-dev:::ARCH:: \
+        librados-dev:::ARCH:: \
+        libfuse-dev:::ARCH:: \
+        libssh2-1-dev:::ARCH:: \
+        libcurl4-gnutls-dev:::ARCH:: \
+        libacl1-dev:::ARCH:: \
+        libiscsi-dev:::ARCH:: \
+        xfslibs-dev:::ARCH:: \
+        libssh-dev:::ARCH:: \
+        libgnutls28-dev:::ARCH::
+
+# Tell libvirt which architecture we want to target
+ENV LIBVIRT_CONFIGURE_OPTS "--host=::ABI:: --build=x86_64-linux-gnu --target=::ABI::"
+
+# Tell pkg-config where to find the non-native .pc files
+ENV PKG_CONFIG_LIBDIR=/usr/lib/::ABI::/pkgconfig
-- 
2.20.1