[Buildroot] Report from the Buildroot Summer Camp
thomas.petazzoni at free-electrons.com
Wed Jul 6 20:17:48 UTC 2016
As was announced on the list, six core/regular Buildroot developers
met from July 1 to July 5 in Toulouse, France, for the "Buildroot
Summer Camp". Peter Korsgaard, Samuel Martin, Yann E. Morin, Romain
Naour, Maxime Hadjinlian and myself participated to this event. Thanks
to spending 5 days full time on Buildroot, we managed to work on a
significant number of topics.
First of all, most of our effort was concentrated on reducing the
backlog of patches in patchwork.
- We started the meeting with about ~250 patches in patchwork.
- We ended the meeting with only 98 patches remaining in patchwork,
which is the lowest number that has been reached in many years. We
hope to continue this effort in the coming weeks, and welcome your
help to review and test the patches that remain in the backlog.
- We merged a total of 357 patches (from
- 1402 e-mails have been exchanged on the list during the meeting.
Noticeable things that have been merged:
- Bump of the SELinux stack. Thanks to Adam Duskett for providing the
- Addition of Qemu defconfig for MIPS r6. Thanks to Vicente Olivert
Riera for providing the patches.
- Many new packages added: python-engineio, python-socketio,
python-tomako, openblas, python-xlwt, python-xlutils, libuio,
python-scapy3k, babeld, systemd-bootchart, acpitool, libaacs,
libbdplus, libvdpau, ninja, supertuxkart, acpica, runc,
docker-containerd, jemalloc, texinfo, rs485conf, circus, dante.
- Better support for Fortran was added, including support for Fortran
in the external toolchains, and the addition of a hidden boolean
that tells packages whether Fortran is available or not. Several
packages started using it. Thanks to Samuel Martin and Vicente
Olivert Riera for working on this topic.
- Addition of BR2_REPRODUCIBLE, which will be used progressively to
make Buildroot builds byte-to-byte reproducible. Thanks to Gilles
Chanteperdrix for starting this effort.
- A significant amount of systemd patches have been merged, mainly
from Gave Evans. Thanks to Maxime Hadjinlian and Yann E. Morin for
their review and additional patches on the topic.
- Support for fetching git submodules in packages has been added. Use
<pkg>_GIT_SUBMODULES = YES in your package to enable the fetching
of git submodules. Thanks to Yann E. Morin for working on this
- The automatic "derivation" of host package dependencies from their
corresponding target dependencies has been removed. This was too
"obscure" and caused a number of mistakes over time. We thought it
was better to make the dependencies of the target and host packages
separate and explicit. A large number of patches was needed to
achieve this goal. Thanks to Julien Floret for his work on the
- The package infrastructure has been changed to not attempt to
download when no <pkg>_VERSION variable is set (instead of defining
it to "undefined"). This allowed to clean-up a number of packages
for which the source code is in Buildroot, or when there is no
source code at all (virtual packages for example).
- Support for building the "system emulation" mode in the host-qemu
package has been added. Thanks to Simon Maes for providing the
- The dependencies on BR2_PACKAGE_BUSYBOX_SHOW_OTHERS have been moved
from package/Config.in to their respective packages.
- libgpg-error was finally bumped (to version 1.23). This was long
overdue, but wasn't a simple bump since libgpg-error now has some
architecture specific bits, so the architecture dependency had to
be propagated to all reverse dependencies.
- A number of tweaks have been made on how the options of some
packages are displayed. However, the complete series from Yann
E. Morin that moved more packages to use "menuconfig" has not been
merged. Both Peter and I felt that it was not really improving the
- Support for the Blackfin architecture in the internal toolchain has
been added. Thanks to Waldemar Brodkorb for working on this topic.
- A host-texinfo package has been added, and is now used as a
dependency of binutils and gdb when needed. This should hopefully
fix the longstanding "makeinfo missing" build failures.
- Packages can now register "target finalize hooks" using
<pkg>_TARGET_FINALIZE_HOOKS rather than the global
TARGET_FINALIZE_HOOKS variable. This makes sure the package hooks
are only called when the package is enabled.
- We have added a new option, BR2_ROOTFS_POST_FAKEROOT_SCRIPT, which
allows to pass to Buildroot some scripts that will be called
*within* the fakeroot environment. It started from a patch provided
by Cam Hutchison that proposed to support rootfs overlays passed as
tarball, and extracted within the fakeroot environment (so that
permissions and owernship are preserved). We replaced Cam's
proposal by a more general solution, similar to the post-build and
post-image script, but that runs within the fakeroot environment,
right before the root filesystem image is produced.
- We decided to reject the "merged defconfig" proposal from Sam
Bobroff, since we believe this should be handled outside of
- As mentionned above, we decided to not merge a significant part of
Yann E. Morin's proposal to use 'menuconfig' in many more places,
though we took some of the patches
- We started discussing the series from Yann E. Morin that splits the
skeleton to improve systemd support, and adds support for using a
read-only rootfs with systemd. Some of the preparatory patches have
been merged. I'll sum up the discussion as a reply to the relevant
I think I can say that all of us really enjoyed this Summer Camp, and
we look forward to the next Buildroot meeting next to the Embedded
Linux Conference Europe.
I would like to thank all the participants who joined this Summer Camp
and participated. I would also like to thank OpenWide/Smile  for
sponsoring the participation of Romain Naour to the Summer Camp.
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux, Kernel and Android engineering
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