...are available here:
https://wiki.linaro.org/WorkingGroups/ToolChain/Meetings/2010-09-06
A copy and activity reports are included below.
-- Michael
Attendees
• Name Email IRC Nick
Andrew Stubbs [email protected] ams_cs
Chung-Lin Tang [email protected] cltang
Julian Brown [email protected] jbrown
Loïc Minier [email protected] lool
Marcin Juszkiewicz [email protected] hrw
Matthias Klose [email protected] doko
Michael Hope [email protected] michaelh
Peter Maydell [email protected] pm215
Richard Earnshaw [email protected] rearnshaw
Ulrich Weigand [email protected] uweigand
Yao Qi [email protected] yao
Agenda
• Licensing of string routines
• State of valgrind
• State of GDB
• Open tickets
□ 600298, 616141, 604753: SMP/sync related
□ 605059 4.4.5
□ 629671 ICE in reload_cse_simplify_operands in thumb-1 mode
□ 590696 Wrong use of objdump during cross build
• Upcoming release
• Creating blueprints
Blueprint Assignee
Initial delivery of Linaro GCC 4.4 ams
Cross Compiler Packages hrw
Action Items from this Meeting
• ACTION: Richard to check with the legal department on string licensing
issues
• ACTION: Peter to talk with valgrind upstream re: Linaro releasing a
ARM-focused version
• ACTION: Michael to organise an 'experimental' PPA that toolchain output can
go into
• ACTION: Michael to talk with Cody Somerville re: building on ARM
• ACTION: Michael to set up a GDB 7.2 based off the release tarball
• ACTION: Andrew to pull sync changes back into 4.4 for this release
• ACTION: Michael to assign appropriate sync ticket to Andrew to track the
backport
• ACTION: Andrew to merge the current post 4.4.4 release branch into our 4.4
for this release
• ACTION: Julian to do a basic investigation into 629671
• ACTION: Andrew to merge the cross-compile objdump ticket into this release
and re-kick upstream process
Action Items from Previous Meeting
• ACTION: Michael to re-check with TSC that we can assign copyright but keep
ability to relicense
• DONE: Yao to continue on GDB for a week then switch to investigation
• ACTION: Peter to check into the state and progress of valgrind for the
meeting on the 30th.
• ACTION: Chung-Lin to shift the CSL backport list out onto the Linaro wiki
• ACTION: Michael to see about doing an archive rebuild with 4.5
• DONE: Michael to send IBM's list to Yao
Minutes
String routines:
• Michael asked Richard about getting the current str* routines by ARM
transferred to Linaro
• Linaro will then get these into other C libraries
• FSF prefers LGPL and copyright for glibc
• Linaro prefers MIT/X11 everywhere so that fixes and improvements can be
shared
• Richard is concerned about the copyright assignment and any patent grant
• ACTION: Richard to check with the legal department on string licensing
issues
• Extreme fallback is to re-write the routines to all be under Linaro
copyright. memcpy() and similar may need this
Valgrind:
• Peter has been looking at how it works on the ARM platform
• Upstream is very responsive to issues
• Now works on Firefox and OO.org
• Upstrem doesn't have any particular release cycle
• ARM changes are pretty extensive and can't be extracted
• Peter suggested making valgrind available in a PPA to start with
• NEON detection at startup is remaining issue
• What next?
□ Packaging is straight forward
□ Don't want to steal upstream's thunder or release something
inappropriate
□ ACTION: Peter to talk with valgrind upstream re: Linaro releasing a
ARM-focused version
• Could bring into the Linaro overlay PPA
• ACTION: Michael to organise an 'experimental' PPA that toolchain output can
go into
• ACTION: Michael to talk with Cody Somerville re: building on ARM
GDB:
• 7.2 is now available
• Time to start up a gdb-linaro based on that
• Matthias mentioned that we will have GDB 7.2 on Maverick
• How should we manage the source
□ QEMU is over git
□ Could use bzr or git
□ bzr with Launchpad can't handle multiple branches when pulling from git
□ GDB is unique in how it's mixed in with the rest of the projects hosted
on sourceare
□ Branches as such are trucky
□ Could just base off tarballs
□ ACTION: Michael to set up a GDB 7.2 based off the release tarball
Tickets:
• ACTION: Andrew to pull sync changes back into 4.4 for this release
• ACTION: Michael to assign appropriate sync ticket to Andrew to track the
backport
• ACTION: Andrew to merge the current post 4.4.4 release branch into our 4.4
for this release
• ACTION: Julian to do a basic investigation into 629671
• ACTION: Andrew to merge the cross-compile objdump ticket into this release
and re-kick upstream process
Patch tracker:
• Andrew noted that it is now fully populated with the GCC data
• Has assigned various patches that still need to go upstream to Yao and
Julian
Next meeting is on 2010-09-08 on the public code.
--- Chung-Lin Tang
== Linaro Toolchain ==
* Google ARM patch sets: committed a second set to SG++ 4.5 trunk on
Tues. AndrewS pushed both sets to Linaro. Worked on a third set, those
related to PR42235, but this time regression test results were not so
clean. Will look into, but considering whether to stop the backports
here.
* LP:628526, submitted a patch to gcc-patches for explicitly turning
off stack protection in libgcc build flags, awaiting response.
* LP:601030, eglibc 2.11/12 problem with ___longjmp_chk on x86-64.
Problem seems to be clear, fix quite simple, but so far cannot seem to
reproduce and verify. Also unclear if I should send the fix to eglibc
or glibc, the idea of the latter making me a bit nervous... :P
== libffi ==
* Got an acknowledgement from the libffi maintainer that he'll review
the VFP hard-float support patch soon.
== This week ==
* Look into remaining Google approved patches, mainly those related to
PR42235 and PR42575.
* Try to reproduce LP:601030 and send patch soon.
* Linaro GCC investigations.
--- Andrew Stubbs
== Linaro GCC ==
* Michael has get the new patch tracker into a usable state. I've
transferred all the data from the old wiki tracker, and looked up the
remaining data as far as I can. The new tracker should now be fully
populated with data. It's here, for the moment:
http://ex.seabright.co.nz/helpers/patchtrack
* Start Yao and Julian on the optimization investigation tasks.
* Continue trawl through the CS bugs looking for candidates to push
to the Linaro tracker.
== Other ==
* Public holiday on Monday.
* Attended the monthly CS/Linaro sync meeting.
--- Yao Qi
== Linaro GDB wrap up ==
* LP:615993 gdb.base/sigstep.exp failures
Patch was committed to gdb mainline and 7.2 branch.
* LP:615995 gdb.base/watch-vfork.exp failures
Discussed with Pedro, create a patch, which fixed failures on ARM,
but can't fix failures on x86(they are caused by different problems).
Leave the x86 failures there, and patch is being reviewed in
gdb-patches.
== Linaro GCC ==
* CS306:Investigate on thumb2 improvement
Read/understand previous effort related on code size
improvement from CSL wiki pages.
Experiment with CSL scripts for size benchmarking. With Dan's
help, run benchmarking in a correct/reasonable way.
'Reproduce' some inefficient code mentioned by Julian. Some of them
are still there.
== Misc ==
* LP:605042
Revert one patch, and rebuild it. No seg fault is found.
== This Week ==
* Continue my work on CS306.
--- Peter Maydell
RAG:
Red:
Amber: virtio-system writeup not going as fast as expected
Green: ARM legal OK now received
Milestones:
| Planned | Estimate | Actual |
finish virtio-system | 2010-08-27 | ? | |
I need to replan this (no forward progress this week
because more important stuff intervened)
Progress:
virtio-system:
- actually trying a SATA disk revealed that the PB926 PCI
interrupt mapping was wrong; now fixed after consulting
the schematics and a round or two of patch testing with Arnd
- I have a PB1176 board but it doesn't seem to talk to
the serial port on poweron. Will try a firmware reflash
but it might just be broken...
- no progress on writeup because other things intervened.
valgrind:
- went through the motions of getting a valgrind svn snapshot
into the ubuntu packaging
- tested on pegatron (A8, maverick, thumb2), found four bugs:
+ BX PC not implemented (fixed upstream)
https://bugs.kde.org/show_bug.cgi?id=249775
+ RBIT not implemented (fixed upstream)
https://bugs.kde.org/show_bug.cgi?id=249924
+ pwrite64 syscall not implemented (fixed upstream)
https://bugs.kde.org/show_bug.cgi?id=249996
+ test for presence of neon wrong
https://bugs.kde.org/show_bug.cgi?id=249775
With a bodge for the last and the fixes for the first 3,
valgrind now successfully runs openoffice and firefox.
other:
- Investigated https://bugs.launchpad.net/bugs/628471 : qemu-maemo
doesn't work with new linaro beagleboard kernels. It looks
like we now try to probe for NAND (which failed earlier
for other reasons which I suspect are a now-fixed bug),
and qemu-maemo's NAND implementation doesn't map anything at
the address the nand code is trying to poll for a status bit.
- first post to qemu-devel :-) (review of somebody's
patch to not confuse SMC with BKPT in the arm decoder)
Plans:
virtio-system:
- hoping to get the qemu patches into the ubuntu qemu-maemo
package, which will avoid the need to talk about patching qemu
- finish the writeup and put it on the wiki
- test PCI patches on PB1176
valgrind:
- respin a valgrind with proper fixes for everything and
put it in a PPA somewhere
other:
- come up with some fix or workaround for #628471
- put the rebased ubuntu qemu-maemo work up onto gitorious
so other people can see it
Absences:
Friday 5 November and 20 other days in this calendar year
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