...are available here: https://wiki.linaro.org/WorkingGroups/ToolChain/Meetings/2010-08-16

Activity reports are included below.

-- Michael

Attendees

Name Email IRC Nick Andrew Stubbs andrew.stubbs@linaro.org ams Julian Brown julian@codesourcery.com jbrown Loïc Minier loic.minier@linaro.org lool Matt Gretton-Dann ARM Matthias Klose doko@canonical.com doko Michael Hope michael.hope@linaro.org michaelh Peter Maydell peter.maydell@linaro.org pm215 Ulrich Weigand ulrich.weigand@linaro.org uweigand Yao Qi yao.qi@linaro.org yao

Agenda

• Benchmarks □ ffmpeg (h.264), libmad (mp3), LAPACK, CoreMark, Dhrystone, and memcpy() □ EEMBC □ Methods of benchmarking • Patch tracking □ Minimum features □ Discovering upstream patches to backport □ Example version at http://ex.seabright.co.nz/helpers/patchtrack □ Ticket view at http://ex.seabright.co.nz/helpers/tickets • Upstream tracking □ Ubuntu tracks release+SVN. What should we do? • memcpy() and friends □ https://wiki.linaro.org/WorkingGroups/ToolChain/StringRoutines □ Copyright issues with EGLIBC • Hardware status • Creating blueprints • Connecting with other groups • Open tickets □ 616141 Backport the sync_* primitive fixes □ 590696 fix wrong use of objdump during cross build □ 600277 Backport ARM Cortex A9 scheduling changes □ 605059 Merge 4.4.5

Action Items from this Meeting

• ACTION: Michael to think about synchronising Linaro releases with upstream • ACTION: Michael to organise a call with Matthias, Loic to continue the topic • ACTION: Michael to write up and email patch tracker mechanics for review • ACTION: Ulrich to add his time away to the Linaro calendar • ACTION: Michael and Ulrich to add GDB new features as blueprints to Launchpad • ACTION: Andrew to look into frequent runs of CSL benchmarks • ACTION: Michael to make sure Linaro has a FSF copyright assignment agreement

Action Items from Previous Meeting

• DONE: Richard to ask the GCC developers on IRC what the status of 4.4.5 is □ Matthias talked with Jacob and they expect a release at the end of August • DONE: Andrew to merge 4.5.1 and the Firefox fix by 2010-08-17 • DONE: Ulrich to ticket GDB items • DONE: Michael to understand whiteboards as a way of organising features

Minutes

Upstream patches:

• Loic, Matthias, and Michael discussed tracking the upstream release branch • Upstream has a roughly three week cycle on patch releases • Matthias tracks this release branch and pulls in SVN as a patch into Ubuntu • Michael is concerned about the extra work, pulling a partial □ feature, catching a regression, fallout due to releasing something that upstream hasn't released, • Release branches are very stable. Chance of a regression is low • Better chance of getting a problem fixed upstream if caught early before the release • Loic: harder to track upstream • Loic: also harder to identify a Linaro release - FSF-4.4.4+svr12345+bzr6789... • Matthias spoke with Jacob in GCC. They expect a release at the end of □ August • Michael prefers basing on released versions only • Michael also wants to be able to reproduce any issues found in Ubuntu. Hard at the □ moment as Ubuntu runs Linaro plus a reasonably large set of patches

ts to be able

• One approach: merge the day after the Linaro release. Gives the maximum time for □ testing. Still a month behind, still have Ubuntu GCC != Linaro GCC • Matthias □ Would continue to keep diff between Linaro and upstream □ Is doing changes upstream □ Would have to maintain those separately □ If there are release critical changes, would have to do them himself • Discussed different phase of Linaro GCC vs Ubuntu - the releases won't be in sync so there will always be a need for release critical fixes in Ubuntu • ACTION: Michael to think about synchronising Linaro releases with upstream □ Drift the Linaro release to be a week later than the upstream release • Andrew wasn't concerned. Noted that the release branches are really good • ACTION: Michael to organise a call with Matthias, Loic to continue the topic

Patch tracking:

• Cortex-A5 changes are coming into Linaro • Michael did a quick show and tell on the patch tracker hack • ACTION: Michael to write up and email patch tracker mechanics for review

Other topics:

• Ulrich is out on vacation next week • ACTION: Ulrich to add his time away to the Linaro calendar • ACTION: Michael and Ulrich to add GDB new features as blueprints to Launchpad • Michael noted that we use bzr for version control wherever possible, including for QEMU • Michael asked Andrew if we could start regular runs of the commonly used benchmark • ACTION: Andrew to look into frequent runs of CSL benchmarks • String routines □ Michael talked with upstream and they greatly prefer FSF+LGPL □ ACTION: Michael to make sure Linaro has a FSF copyright assignment agreement • Loic mentioned Valgrind patches □ Peter is interested in helping

Next meeting is a stand-up meeting on 2010-18-11 on the public code.

-- Julian Brown == GCC 4.5 bugs in Launchpad ==

* Attempted to reproduce bugs against Linaro GCC 4.5 in Launchpad: issues #614184, #614185 and #614186. The last of these has been closed as invalid by the submitter already, and the first two don't seem to reproduce using a cross-compiler (i.e. using CS's build machinery), nor with a natively-bootstrapped bzr head build (as of some day last week). So, no real progress there.

== GCC 4.5 vectorization improvements ==

* Started tracking down the causes of some failures in vect.exp: pr43430-1.c failed because of missing vector comparison support. This seemed relatively straightforward to implement using NEON instructions, so I had a go at doing that. Similarly another test fails (vect-35.c) because of missing support for widening/narrowing patterns, though I'm still investigating a fix for that.

-- Andrew Stubbs == Linaro GCC releases ==

* Merged GCC 4.5.1 into the Linaro sources. * Respun the 4.5-2010.08 release.

== Linaro GCC 4.5 ==

* Continued pushing SG++ patches into Linaro. I'm now most of the way through these, but I had hoped to have had it done by now.

== Other ==

* Lost a few hours to internet outages. An engineer came out and changed all the connections, so hopefully that's solved the problem. It seems the recent bad weather had got into the underground cables between here and the street cabinet. It's fibre from there, so in theory it must be local.

* Took Wednesday as vacation.

-- Peter Maydell

Subject: [weekly][linaro] report week 32

RAG: Red: None Amber: ARM legal OK for qemu contributions Green: booted versatile+virtio kernel on qemu

Milestones: none as yet

Progress:

virtio-system: - identified which qemu patches give a qemu which can boot linaro alpha-3 on beagle emulation - built a kernel for 'versatile' flavour with virtio support - found some patches from qemu upstream which are needed for newer versatile kernels to boot - got my versatile kernel running on qemu with the linaro rootfs mounted via virtio - put various qemu changes/patches into a git tree, so (a) I know what I changed and (b) as an exercise in learning git

Issues: none

Plans:

virtio-system: - get versatile to boot *without* virtio for comparison - find an io benchmark and do some benchmarking qemu-focused-kernel: - flesh out this blueprint

Absences: None planned.

-- Chung-Lin Tang

== libffi VFP hard-float support ==

Testsuite fixes and final tuning before submitting. Had to port some stuff from the GCC testsuite to let libffi's testsuite support a dg-skip-if option, to skip some variadic function tests based on compiler options (skip when -mfloat-abi=hard), and I am not a DejaGNU/expect/Tcl expert...:P Whole patch was submitted to main libffi mailing list on Sunday, waiting for feedback. (see http://sourceware.org/ml/libffi-discuss/2010/msg00153.html)

== This week == * See if any feedback on libffi patch. * Start Linaro 4.5 EEMBC comparisons. * Catch up on GCC work.

-- Yao Qi == Linaro GCC ==

* Pinged ARM backend maintainer for my patch to GCC PR45094. Still no response.

* Submit my patch on ARM target triplet in gcc-patches. With Dan's help, got GCC write access. Checked in my patch.

* Update status of LP bugs. Mark them as Fix Released since failures go away in gcc-linaro-4.4-2010.08-0.

== Linaro GDB ==

* Search something about GDB from my brain, like gdb test, tcl/expect, ptrace/breakpointetc. Fortunately, most of them are still there. :)

* LP:615997 gdb.dwarf2/dw2-ref-missing-frame.exp failure Failure is caused by alignment of test case. Sent a patch to gdb-patches, and revise it with Dan's help.

* LP:615989 gdb.base/pending.exp Failure is caused by wrong code in .debug_line. Failure goes away when it is compiled by gcc-linaro-4.5-2010.08-1. Open a gcc bug LP:617384.

* LP:615995 gdb.base/watch-vfork.exp : Watchpoint triggers after vfork (sw) (timeout) Reproduce it on x86. GDB is waiting endlessly between TARGET_WAITKIND_FORKED and TARGET_WAITKIND_VFORK_DONE. Looks like child of debuggee hangs on 'signal'.

== This Week ==

* Look into LP:615995 deeply, and other linaro gdb bugs.