== Activity ==
- AFDS and AFDS review comments
LLD:
- Have nudged the ARM exceptions story in lld along a bit, I've had
one patch accepted, but not the most important one.
- Updated the Linaro TCWG jira issues post Connect
- Worked on static linking and ifunc support. I have managed to get
ifunc working for dynamic linking and static linking working for an
old ARM only sysroot. The latest Linaro linux-gnueabi-hf sadly
segfaults in __libc_init_first -> __ctype_init, with what looks like
stack corruption of the return address. I at least have a good idea of
what needs to be done to make static linking work.
Other LLVM:
Some upstream review comments for ILP32 support and others.
== Plans ==
On holiday all week. Will attempt to continue upstreaming lld work
that I already have patches and tests for.
# Progress #
* TCWG-333, Fix gdb.base/func-ptrs.exp fails in thumb mode.
[3/10] Recall some discussions on it in GNU Cauldron, and
dig into GDB source. Unfortunately, GDB decides to track
function address rather than function pointer in 2001, which
makes harder to fix it. Still thinking about it.
* TCWG-556, aarch32 GDB buildbot slave. [2/10]
Build GDB and test cases in arm on an aarch64 machine. There are
1000+ test fails, but not triaged yet. Discussed upstream on how to
set up buildbot slave with special configuration option and test
board file. Ongoing.
* TCWG-685, GDB 7.12 release, and patches review. [1/10].
All blocking issues are gone. 7.12 should be released soon.
* Clean up arm xml files. Done. [3/10]
* Misc, meetings. [1/10]
# Plan #
* TCWG-333, TCWG-556.
* As 7.12 goes out, ping my pending patches on TCWG-518, and TCWG-547
--
Yao Qi
== Progress ==
* [Lab] ASAN test fails with glibc 2.23 [TCWG-811]
- Recommitted upstream after discussing with Adhemerval at Connect
(thanks, Adhemerval)
- The bot is now upstream
* Add worktree module to tcwg-release-tools [TCWG-783]
- In review. Trying to use it in our llvm-projs helper script
* Investigate buildbot failure on clang-native-arm-lnt [TCWG-832]
- Found and reverted the offending patch
- Ran a pre-commit test on the second version of the patch
* [Lab] Xenial Stage1 test failure: std::length_error [TCWG-821]
- Couldn't use gdb on this, so I had to manually find the call that
throws the exception; the code seems to be doing the right thing, and
in addition selfhosting works, so we're suspecting either some
undefined behaviour or a bug in the g++ toolchain on the bot
- Neither ubsan nor clang-tidy had much to complain about the code,
so this will require more investigation
* Misc
- Upstream code reviews, meetings etc
== Plan ==
* [Lab] Xenial Stage1 test failure: std::length_error [TCWG-821]
* [ARM] Switch from itineraries to schedule models [TCWG-824]
== Progress ==
* [Lab] ASAN test fails with glibc 2.23 [TCWG-811] [4/10]
- This issue is keeping us from moving one of the TK1 bots into production
- Committed a patch upstream, but it broke on an x86_64 bot when
compiling with -m32
- I tracked the problem to the wrong glibc function being used when
-fsanitize=address is provided on the command line
- Reported the problem on the mailing list
* Add worktree module to tcwg-release-tools [TCWG-783] [4/10]
- Made good progress on this, should be ready for review soon
* Misc [2/10]
- Code reviews, preparing for Connect
== Activity ==
Exceptions.
Another attempt at ARM exceptions support. I did get some more fine
grained comments back which have been addressed, but no approval to
commit yet.
Some follow up over whether ld -r support for merging output sections
is necessary, answer seems to be yes as kernel modules depend on it.
I've volunteered to post a simpler patch without ld -r support as this
is a very niche use case. Not had any feedback yet so will just post
it next week.
TLS
Fixed TLS support in lld so that it does not attempt to follow lld's
generic relaxation model, which can't be implemented in ARM. Still
some work to do for static linking.
== Next Week ==
Out of office at Linaro Connect in Las Vegas
== Planned Absences ==
Holiday 10th to 14th October
* Two days off [4/10]
# Progress #
* TCWG-685, GDB 7.12 release. [2/10]
Patch "keep RES0 bits in CPSR" is pushed into mainline and 7.12.
Find a GDBserver bug, and open PR 20627. It is target independent,
but may block the release. :(
* TCWG-518, Range stepping in ARM. [3/10]
Regression test is done. Find some other issues exposed by my
patches, and fix them. Need to post patches upstream for review.
* Misc [1/10]
Close gdbserver in mi_gdb_exit. The bug breaks the aarch64 multi-arch
testing. Patch is pushed in.
File expense for GNU Cauldron travel.
# Plan #
* Linaro Connect.
--
Yao Qi
Hello,
I'm using Linaro GCC 4.9-2015.01-3 for AArch64, and trying to disable the
generation of guarded instructions. More specifically, I'd like not to see
instructions such as 'cset', 'csinc', 'ccmp', 'fccmp', etc.
So far, it seemed that the flag '-fno-if-conversion2' could do the job, but
I still see those instructions in my disassembled program functions (I
guess that it may not be possible to remove them from standard libs).
My command line:
aarch64-linux-gnu-gcc -static -march=armv8-a -O3 -fno-strict-aliasing
-fno-if-conversion2
I also tried '-fno-if-conversion' and both '-fno-if-conversion
-fno-if-conversion2' without success.
Regards,
--
Fernando A. Endo, Post-doc
INRIA Rennes-Bretagne Atlantique
France
o Travel from Cauldron (2/10)
o One day off (2/10)
== Progress ==
o Linaro GCC/Validation (7/10)
- Started backports for 2016.10
- Investigating 4.9.4 branch marge validation issues
- Extended validation monitoring, tried to reproduce an OOM issue.
o Misc (3/10)
* Various meetings and discussions.
* Connect preparation
== Plan ==
o Tuesday off
o Continue on-going tasks and travel to LAS16
== Progress ==
* Validation
- patch reviews (Jenkins jobs, abe)
* GCC
- reported a few regressions on trunk
- looked at making reporting scripts more robust
at handling DejaGnu errors that could otherwise
be un-noticed
* Binutils
- backported a fix from trunk to linaro-2.27 branch, to close bug
2518 (linker SEGV)
- investigating https://sourceware.org/bugzilla/show_bug.cgi?id=20608
"Relocation truncated to fit: R_ARM_THM_JUMP24 for relocation to PLT entry"
* misc (conf-calls, meetings, emails, ....)
- Connect preparation
== Next ==
- monitor GCC trunk regressions
- release scripts/abe
- backports/reviews
- Binutils bug 20608
