Minutes from the Toolchain WG weekly meeting are available at: https://wiki.linaro.org/WorkingGroups/ToolChain/Meetings/2010-08-02

A copy, along with activity reports, follow.

-- Michael

= Monday 2nd August 2010 = == This month's meetings == <<MonthCalendar(WorkingGroups/ToolChain/Meetings,2010,08,,,,WorkingGroups/ToolChain/MeetingTemplate)>>

== Attendees ==

||<rowbgcolor="#333333" rowstyle="color: white; font-weight: bold;"style="text-align: center;">Name ||<style="text-align: center;">Email ||<style="text-align: center;">IRC Nick || || Andrew Stubbs || andrew.stubbs@linaro.org || ams || || Julian Brown || julian@codesourcery.com || jbrown || || Michael Hope || michael.hope@linaro.org || michaelh || || Richard Earnshaw || richard.earnshaw@arm.com || rearnshaw || || Ulrich Weigand || ulrich.weigand@linaro.org || uweigand || || Yao Qi || yao.qi@linaro.org || yao ||

== Agenda ==

* Review action items from last meeting * New public call-in number: code 263 441 7169 * Hardware availability * Next milestone * Outstanding changes that could be merged * GCC testsuite failures and what to do about them * http://ex.seabright.co.nz/helpers/testlog/gcc-linaro-4.4-93543/logs/armv7l-m...

||<rowbgcolor="#333333" rowstyle="color: white; font-weight: bold;"style="text-align: center;">Blueprint ||<style="text-align: center;">Assignee || || [[https://blueprints.launchpad.net/gcc-linaro/+spec/initial-4.4%7CInitial delivery of Linaro GCC 4.4]] || ams || || [[https://blueprints.launchpad.net/ubuntu/+spec/arm-m-cross-compilers%7CCross Compiler Packages]] || hrw ||

== Action Items from this Meeting ==

* ACTION: Michael to organise and spread next Monday's call in number * ACTION: Richard to ask the GCC developers on IRC what the status of 4.4.5 is * ACTION: [[LP:500524]] Ulrich to backport to Linaro 4.4 * ACTION: Test failures: Michael to build FSF 4.4.4 as a baseline * ACTION: Test failures: Michael to compare FSF and Linaro GCC failures * ACTION: Test failures: All Linaro GCC failures to be ticketed * ACTION: LTO check on ARM: Michael to reproduce * ACTION: Ulrich to write up known GDB work * ACTION: [[LP:598147]]: Michael to reproduce the test failures * ACTION: [[LP:398403]]: Andrew to reproduce on his IGEP board (has more RAM) * ACTION: Michael to make sure merge requests are present for work that has been done

== Action Items from Previous Meeting ==

* ACTION: Michael to organise and spread next Monday's call in number * DONE: Michael to re-check release dates and suggest something * Set to the second Tuesday of each month. Lines up with other Linaro releases quite well. * DONE: Michael to rename the intermediate milestone * Set to 2010.08-0. Created 2010.09-0 for the next. * DONE: Loic to find the Chrome OS contact name for the records * DONE: Ulrich to confirm PowerPC approach with Matthias * Confirmed that reverting the PowerPC changes is OK

== Minutes ==

* Reviewed the action items from the previous meeting * Reviewed the high-priority tickets * Merging 4.4.5 * Michael is unhappy with merging for next weeks release unless 4.4.5 comes out in the next few days * Richard went through the announcements. Last was for 4.4.4 on April 30. * 4.4.5 is due around now * Expect that the GCC team are focused on 4.5.1 instead * ACTION: Richard to ask the GCC developers on IRC what the status of 4.4.5 is * [[LP:500524]] * Ulrich has done upstream in 4.4.5 * A small change, unlikely to cause correctness regressions, may cause performance regressions * ACTION: Ulrich to backport to Linaro 4.4 * GCC test suite * Michael asked what level of failures are acceptable * Richard said that the FSF GCC has never been completely clean on ARM * Failures may exist upstream * In the future, should investigate all and fix * For now, investigate regressions * ACTION: Michael to build FSF 4.4.4 as a baseline * ACTION: Michael to compare FSF and Linaro GCC failures * ACTION: All Linaro GCC failures to be ticketed * Regressions marked as 'test regression' with Medium severity * Existing failures to be marked as 'test failure' with Low severity * Wiki page [[Toolchain/UbuntuRegressions]] has triage from earlier * Ulrich noted that fixing [[LP:500524]] in Linaro will overlap with Ubuntu toolchain maintainer's current 4.4.4+svn patch * Michael said that it is the responsibility of the Ubuntu toolchain mainter to manage that * Linaro will notify them on the change * Discussed LTO * Michael sees LTO tests fail on gcc-linaro-4.5 on ARM with --enable-languages=c,c++ * Assumed it was binutils related * Ulrich: shouldn't be as GCC does most of the work * ACTION: Michael to reproduce * Future work * Focused on GCC at the moment * Need medium term plan * Focused on the core toolchain * GCC * Binutils * GDB * eglibc * New hire specialises in qemu and will focus on that * Multiarch is written up, unsure if we've agreed to do the work * ACTION: Ulrich to write up known GDB work * Medium severity tickets * [[LP:598147]] * May be three issues in one ticket * Issues due to hardening, now fixed * Stack crash due to invalid usage * Extra test failures * ACTION: Michael to reproduce the test failures * [[LP:398403]] * ACTION: Andrew to reproduce on his IGEP board (has more RAM) * Ongoing work * ACTION: Michael to make sure merge requests are present for work that has been done

--- Yao: == Linaro GCC 4.4 bug fix ==

* LP:604874. Tried different set of configure/build options to reproduce segfaults. Ulrich Weigand finally fixed this bug.

* LP:497295 It is about an ICE on maverick/arm. Reproduced ICE on maverick/x86. ICE goes awy on linaro gcc, so it is not caused by linaro patches. Finally, I find it is related to gcc-default-ssp.diff in Ubuntu. Team decide to leave it as won't fix for 4.4, and get fix from upstreams in 4.5.

* Issue #3314|LP:602288 Understand previous comments on this issue, and read something on "address cost" in gcc. Looks like not easy to fix this problem.

* LP:612011|GCC PR45094 Create a patch against PR45094, and tested on ARM/QEMU. Post my patch to gcc-patches first time in my life. A typo is found in my patch. I fixed typo and submit a new patch again. Suggested to run regression test again.

* LP:602285|Issue #5157 This bug is caused by our restrictions to the unrolling times. Proposed two options to fix this bug. Waiting for the feedback from the team.

== Misc ==

* Try gnu-checkout/gnu-devel/gnu-test for linaro toolchain * Read doc on ARM ABI and procedure call standard

== This Week ==

* Get patches to PR45094 approved, and backport it for LP:612011.

* Discuss with team and choose one from two options to fix LP:602285.

* Other bugs on launchpad.

--- Andrew: == IGEPv2 ==

Continued with IGEPv2 board bringup. The OS that came with the board proved inappropriate for creating Ubuntu Maverick chroots, so I looked to updating the board. The IGEP website has tutorials on how to do this using a tool called "rootstock".

It didn't take to long to get the board running with a more recent kernel, but using an Ubuntu Lucid rootfs proved more problematic. Getting a base system installed is not too hard, but that doesn't have sshd or any other way to get in, and although serial output works, serial input is broken, and I don't have a USB keyboard (imagine that!) so using the video console is no good either.

Solved this problem by rebuilding a new rootfs that did have sshd in it, and getting that setup right. Then installed all the new software I wanted, set up a maverick chroot on NFS to work with, and gave Yao and Chung-Lin access.

All was working well, so I took the SD card out, backed it up, returned it to the board, and now it won't boot, again! To be continued ....

== GCC 4.5 ==

Applied the first batch of SourceryG++ GCC 4.5 patches to the Linaro sources, tested them, found them good, and pushed them to launchpad. Applied another set of patches, and set them testing.

Marked all the patches in the CodeSourcery patch tracker that I definitely won't be pushing to Linaro.

== Linaro patch tracker ==

Corresponded with Michael Hope regarding the Linaro patch tracker.

== Other ==

Finished getting the CodeSourcery build system to work with Launchpad, and the Linaro GCC configurations.

-- Ulrich == GCC ==

* Analyzed and fixed bug #604874 (Firefox fails to build) - Fixed upstream (mainline, 4.5.2) as PR c++/45112 - Linaro GCC 4.4 branch merge request pending * Analyzed and fixed bug #500525 (bootstrap failure in stage3) - Backported mainline fix to upstream 4.4 branch * Miscellaneous bug analysis / triage / comments on: #437726, #608125, #607665, #505829, #600209 * Provided patch to revert CodeSourcery PowerPC changes from Linaro GCC 4.4 (now merged).

== GDB ==

* Continued looking into GDB 7.2 test suite regressions * Initial implementation of Thumb-2 support in ARM prologue parsing

== Miscellaneous ==

* Provided write-up of multiarch toolchain implications document

== Infrastructure ==

* Ordered IGEPv2 board