This may be a better question for the linaro tools group. +cc their list
for the general question of conventions surrounding how shared library
objects identify and access thread-local storage that they need as part of
calling threads.
On Tue, May 17, 2016 at 11:06 AM, Nikhil Agarwal <nikhil.agarwal(a)linaro.org>
wrote:
> Hi All,
>
> I am trying to write a shared library object over ODP. Our ODP library has
> some per thread variables. When my application invokes an API of shared
> object which accesses per thread variable it gives segmentation fault.
>
> My concern is that when a shared object is loaded dynamically, how memory
> is assigned to thread specific variables defined inside shared objects.
> AFAIK we need to compile it with -ftls-model=global-dynamic, which is
> enabled by default when compiled with -fPIC flag, and library loader
> takes care for these issues.
>
> I am not an expert in this area, please help me in getting to some
> suitable reference pointers or some steps I might have missed.
>
> Thanks in advance
>
> Nikhil
>
=== This Week ===
Enable LLDB testsuite to show zero failures on Hikey 96 Board (AArch64
Linux) [TCWG-231] [4/10]
-- Ran multiple builds and testsuite runs to figure out latency issues.
-- Investigated remaining failures and submitted appropriate bugzilla bugs.
-- Committed xfails upstream.
Support for watchpoint un-alligned watchpoint addresses on LLDB
AArch64 [TCWG-367] [1/10]
-- Some investigation on possible solutions and frequently encountered
scenarios.
LLDB Chromebook Test Stability [TCWG-563] [3/10]
-- Investigation of noreturn unwinding test failure
-- Investigation of step over load library call failure
-- Investigation of other failures and commit xfails for reported issues.
Miscellaneous [2/10]
-- Meetings, emails, discussions etc.
-- Portugal visa information gathering
=== Next Week ===
Support for watchpoint un-alligned watchpoint addresses on LLDB
AArch64 [TCWG-367]
-- Add code changes required to manage a watchpoint with multiple
hardware watchpoint resources.
LLDB Chromebook Test Stability [TCWG-563]
-- Fix noreturn unwinding test failure and report relevent bug.
-- Fix step over load library call failure or report relevent bug.
Miscellaneous
-- Portugal visa application documents preparation.
== Progress ==
* Validation
- cleanup
- reviews
- looked a bit a using docker from Jenkins
- investigating how to select toolchain components versions
depending on the gcc version
* GCC
- Sent Neon intrinsics tests patches.
- trunk timeouts: caused by the libcilkrts merge, which has a bug on
arm. Disabled cilkplus to avoid too much noise in the results.
- reported a couple of regressions/bisects
* Misc (conf-calls, meetings, emails, ....)
- support for M-profile related queries ( multilib etc...)
== Next ==
* Validation
- cleanup
- reviews
- armv8l vs arm
- multiple gcc branches vs other components versions handling
* GCC
- trunk monitoring
- some dev if time permits
== Progress ==
o Linaro GCC (5/10)
* Linaro GCC 5.3 2016.05 snapshot
- FSF branch merge + release
* Linaro GCC 6.1 2016.05 snapshot
- Create new branch + release
o Extended validation (3/10)
* Fixed validation issues when binary tarballs are created.
o Misc (2/10)
* Various meetings and discussions.
== Plan ==
o Continue on validation/benchmarking
o Catch up with upstream work.
== Progress ==
* Add a diag handler for llc so it doesn't exit on the first error it
finds [TCWG-592] [5/10]
- Started a discussion about a new diagnostic handler for llc
- Patch accepted upstream, but broke a few things (Renato has
investigated/fixed some of them - thanks)
* Inline assembly constraints support for ARM [TCWG-560] [5/10]
- Patch in upstream review, but should be committed after the new
llc diagnostic is in place (otherwise it's difficult to test it
meaningfully)
== Plan ==
* Add a diag handler for llc so it doesn't exit on the first error it
finds [TCWG-592]
- Fix the remaining issues and get the patch committed again
* Inline assembly constraints support for ARM [TCWG-560]
- Rebase patch and try to get it reviewed
* Investigate exit-on-error on LLC [TCWG-594]
- Track the tests that need the exit-on-error flag with the new
diagnostic handler
== Progress ==
- ldr rt,= implementation transform to MOV committed upstream
[TCWG-468] [PR25722]]
-- Thanks to Renato for committing.
- Started looking at what would be needed to port lld to ARM
-- The ELF lld port looks to have a fairly small amount of
architecture specific hooks. Decided that I would learn fastest by
just trying to do an ARM only prototype port to see if I could get
hello world on linux working.
-- spent too much time trying to think about how to best implement the
group relocations for the PLT sequences then remembered that for a
quick prototype I could use larger sequences that didn't need the
relocations.
== Plan ==
- Continue working on an ARM LLD port. Will hopefully have a good idea
of what the scope of work needed is next week.
The Linaro Toolchain Working Group (TCWG) is pleased to announce the
2016.05 snapshot of both Linaro GCC 5 and Linaro GCC 6 source
packages.
Linaro GCC 6 monthly snapshot[1] is based on FSF GCC 6.1+svn236106 and
includes performance improvements and bug fixes backported from
mainline GCC. This snapshot contents will be part of the 2016.08
stable[2] quarterly release.
This snapshot tarball is available on:
http://snapshots.linaro.org/components/toolchain/gcc-linaro/6.1-2016.05/
Interesting changes in this GCC source package snapshot include:
* Updates to GCC 6.1+svn236106
Linaro GCC 5 monthly snapshot[1] is based on FSF GCC 5.3+svn236108 and
includes performance improvements and bug fixes backported from
mainline GCC. This snapshot contents will be part of the 2016.08
maintenance release.
This snapshot tarball is available on:
http://snapshots.linaro.org/components/toolchain/gcc-linaro/5.3-2016.05/
Interesting changes in this GCC source package snapshot include:
* Updates to GCC 5.3+svn236108
* Backport of [Bugfix] [AArch32] PR target/70711 Fix big-endian ARMv8.1-A builds
* Backport of [Bugfix] [AArch64] PR target/70044 -flto turns on
-fomit-frame-pointer
* Backport of [AArch32] Reduce size of arm1020e automaton
* Backport of [AArch64] Fix SIMD predicate
* Backport of [AArch64] Fix thinko in handling of
-momit-leaf-frame-pointer option
* Backport of [Testsuite] [AArch32] Tests for arm_restrict_it patterns
in thumb2.md
* Backport of [Testsuite] gcc-dg: handle all return values when
shouldfail is set
Subscribe to the important Linaro mailing lists and join our IRC
channels to stay on top of Linaro development.
** Linaro Toolchain Development "mailing list":
http://lists.linaro.org/mailman/listinfo/linaro-toolchain
** Linaro Toolchain IRC channel on irc.freenode.net at @#linaro-tcwg@
* Bug reports should be filed in bugzilla against GCC product:
http://bugs.linaro.org/enter_bug.cgi?product=GCC
* Interested in commercial support? inquire at "Linaro support":
mailto:support@linaro.org
[1]. Source package snapshots are defined when the compiler is only
put through unit-testing and full validation is not performed.
[2]. Stable source package releases are defined as releases where the
full Linaro Toolchain validation plan is executed.
== Progress ==
* 3 days off (Mon/Thu/Fri) [6/10]
* Inline assembly constraints support for ARM [TCWG-560] [3/10]
- More investigations for PR24071; found the cause of the bug,
working on a fix.
* Rework LLVM helper scripts [TCWG-571] [1/10]
- Addressed code review comments.
- The interface changes to llvm-projs and llvm-sync are now committed.
== Plan ==
* Inline assembly constraints support for ARM [TCWG-560]
- Come up with a fix for PR24071
* Rework LLVM helper scripts [TCWG-571]
- Investigate git worktree and how it could be factored into our
scripts (llvm-projs, llvm-build)
o 2 days off (4/10)
== Progress ==
o Extended validation (4/10)
* Change extended native job to use multiple scm
* Investigate validation issues when binary tarballs are created
o Linaro GCC (1/10)
* Finalized and submitted new Linaro development branch script.
o Misc (1/10)
* Various meetings and discussions.
== Plan ==
o Create Linaro GCC 6 branches
o Continue on validation and upstream work.
* 2 days off (Thu/Fri)
== Progress ==
* Validation
- restarted validations for pending backports, after the various
branches updates
- started looking at armv8l vs arm results differences
* GCC
- checked trunk regression reports
- updated AArch32 Neon intrinsics tests. Patch series almost ready
for submission
* Misc (conf-calls, meetings, emails, ....)
== Next ==
* Validation
- cleanup
- reviews
- armv8l vs arm
* GCC
- trunk monitoring: check why builds were killed after timeout
- more intrinsics tests
