gitlab-ci: arm64 cross compiling

First I tried to build in a full sysroot, but I didn't figure out why
ld never found the libraries (this was on fedora, which might have
been part of the problem - if you just need a toolchain for kernel
corss-building fedora is perfectly fine).

Then I tried using debian's multiarch stuff, which worked a lot
better, except there's some minor gotchas:
- some libraries conflict and can't be multi-arch installed
- some libraries are buggy and cause conflicts when installing
- pkgconfig and ld get confused with some other libraries and pick the
  first one they find (i.e. the x86_64 one, not the arm64 one).
That means we need a new docker image with just the cross libaries
installed as -dev packages, and none of the native ones.

Next up I tried to run the tests. Meson has really nice support for an
exe wrapper, and qemu happily runs arm64 on x86_64. With that I
managed to run some tests successfully (it's not even that slow!). But
most are run through a script, and the script doesn't know about the
exe wrapper and hence fails miserably. I discussed this a bit with
Dylan and he filed an upstream meson issue:

https://github.com/mesonbuild/meson/issues/4427#issuecomment-433553689

Another option would be to use binfmt-misc handling (which works
neatly locally), but on the runners we have I can't control that.
Maybe I can beg Daniel Stone ...

For not let's just mark this stage as optional and that failures are
allowed.

v2: Use the new gitlab 1.4 feature to rebuild docker images when
necessary.

Cc: Sean Paul <sean@poorly.run>
Cc: Eric Anholt <eric@anholt.net>
Cc: Dylan Baker <dylan@pnwbakers.com>
Cc: Daniel Stone <daniel@fooishbar.org>
Reviewed-by: Eric Anholt <eric@anholt.net> (v1)
Reviewed-by: Petri Latvala <petri.latvala@intel.com> (v1)
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 46 insertions, 0 deletions

diff --git a/Dockerfile.debian-arm64 b/Dockerfile.debian-arm64
new file mode 100644
index 00000000..20c2e8b3
--- /dev/null
+++ b/Dockerfile.debian-arm64
@@ -0,0 +1,46 @@
+FROM debian:stretch-backports
+
+RUN apt-get update
+RUN apt-get install -y \
+			flex \
+			bison \
+			pkg-config \
+			x11proto-dri2-dev \
+			python-docutils \
+			valgrind \
+			peg
+
+RUN dpkg --add-architecture arm64
+RUN apt-get update
+RUN apt-get install -y \
+			gcc-aarch64-linux-gnu \
+			libpciaccess-dev:arm64 \
+			libkmod-dev:arm64 \
+			libprocps-dev:arm64 \
+			libunwind-dev:arm64 \
+			libdw-dev:arm64 \
+			zlib1g-dev:arm64 \
+			liblzma-dev:arm64 \
+			libssl-dev:arm64 \
+			libcairo-dev:arm64 \
+			libpixman-1-dev:arm64 \
+			libudev-dev:arm64 \
+			libgsl-dev:arm64 \
+			libasound2-dev:arm64 \
+			libjson-c-dev:arm64 \
+			libcurl4-openssl-dev:arm64 \
+			libxrandr-dev:arm64 \
+			libxv-dev:arm64
+
+RUN apt-get install -t stretch-backports -y \
+					meson \
+					libdrm-dev:arm64 \
+					qemu-user
+
+# autotools build deps
+RUN apt-get install -y \
+			autoconf \
+			automake \
+			xutils-dev \
+			libtool \
+			make