All,
During Connect the suggestion was made that each working group should have
its own IRC Channel for discussions and topics relating to the group in
particular (as opposed to #linaro which is 'generic' Linaro conversations).
Therefore I have just set up #linaro-tcwg on Freenode for the Toolchain
Working Group.
This channel is public and open to anyone who wants to talk with the TCWG
group about anything toolchain related.
Thanks,
Matt
--
Matthew Gretton-Dann
Toolchain Working Group, Linaro
== This Week ==
* GCC bugs (5/10)
a) Extend malloc_candidate_p to handle multiple phi's (TCWG-1331):
Fixed testsuite regressions
b) Extend sincos to handle sin 2x (PR83661): Started working on patch.
* TCWG-1234 (2/10)
- A one liner patch that pessimizes hoisting by requiring an
expression to be in AVAIL blocks of all immediate successors works for
improving the regression.
- Working to make the patch more general to avoid pessimizing hoisting.
* Public holiday (2/10)
* Misc (1/10)
- Meetings
== Progress ==
o Linaro GCC/Validation
* 2018.01 snapshots deployed
* 2018.02 release candidates will be done when CVE mitigation will
be contributed upstream.
o LLVM
* "unpredictable" handling (Bugzilla 33011, ...): on-going
* Investigated OOM issue further... without much success.
* Python scripts reviews
o Misc
* Various meetings and discussions.
* Preparing Connect presentations
Note: working for Linaro every other week
== Progress ==
* PR35157 / TCWG-1308 (crash in ARM backend for VST1d64TPseudoWB_fixed
instruction):
+ after 2 attempts got now a clean patch with no testsuite regression
+ need to add testcase and it will be good to go upstream
* Track down why xdg-open launches libreoffice for .dot files and opened
Launchpad LP#1744953.
* Misc meetings
== Plan ==
* submit fix for PR35157 (crash in ARM backend for VST1d64TPseudoWB_fixed
instruction)
* fix for PR34170 / TCWG1137 (cannot select truncate in ARMv7 backend)
* start preparing slide for bswap/store merging passes presentation in
hacker room at Connect HK2018
# Progress #
* GDB is confused by the line table generated by GCC with -gcolumn-info
PR 22531. [2/5]
My preparatory patches are reviewed, mostly on C++, get encouraged to
use more fancy C++ features.
* gfortran 7.2 vs 8.0 debug information difference. [2/5]
Many gdb.fortran test fails with gfortran 8 but gfotran 7.2 is OK. I
'git bisect' gcc and find the commit causing the debug info change,
it is like a bug to me, but my compiler/fortran knowledge is too few
to claim it is a 7.2 -> 8.0 regression.
Posted my analysis to gcc@ and fortran@ mail list.
* TCWG-1040, SVE patches review. [1/5]
Review Alan's patches.
# Plan #
* PR 22531, upstream preparatory patches,
* Write patch series v2 for TCWG-1292.
--
Yao Qi
== Progress ==
* GCC
- FDPIC
- debugging CI loop
* GCC upstream validation:
- reported a few regressions
- contributed to jenkins jobs
* Infrastructure:
- looking at how to use lava to boot boards in gcc validation (with Remi)
* misc (conf-calls, meetings, emails, ....)
== Next ==
* GCC/FDPIC
* GCC upstream validation
Hi,
given the following code:
-- isystem_test.cpp -------------
#include < isystem_test.h>
bool dummy_function( void )
{
return false;
}
-----------------------------------------
-- isystem_test.h ------------------
template <class _CS_cT>
class allocator
{
};
-----------------------------------------
and g++ version: arm-eabi-g++.exe (Linaro GCC 7.2-2017.11)
1. compiling with "arm-eabi-g++ -I . -g -c isystem_test.cpp"
--> OK
2. compiling with " arm-eabi-g++ -isystem . -g -c isystem_test.cpp "
--> output error:
In file included from isystem_test.cpp:3:0:
./isystem_test.h:3:1: error: template with C linkage
template <class _CS_cT>
^~~~~~~~
It seams that the option -isystem changes the include of isystems_test.h into a C include, i.e. the header content seems to be handled as C-Code
Same error behavior with arm-eabi Linaro GCC 6.4-2017.11, Linaro GCC 6.3-2017.05
-----------------
Testing the same with the mingw msys g++ compiler outputs no error:
g++.exe (Rev2, Built by MSYS2 project) 7.2.0
Copyright (C) 2017 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
---------------
Also no errors for:
arm-linux-gnueabihf-g++.exe (Linaro GCC 6.3-2017.05)
---------------
Is there a special behavior for arm-eabi g++ compiler?
Best regards
Martin Kaul
The Linaro Toolchain Working Group (TCWG) is pleased to announce the 2018.01
snapshot of Linaro GCC 6 and 7 source packages.
o The GCC 7 series introduced an ABI change for ARM targets by fixing a bug
(present since GCC 5, see link below) that affects conformance to the procedure
call standard (AAPCS). The bug affects some C++ code where class objects are
passed by value to functions and could result in incorrect or inconsistent code
being generated. If the option -Wpsabi is enabled (on by default) the compiler
will emit a diagnostic note for code that might be affected by this ABI change.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77728
For an explanation of the changes please see the following website:
https://gcc.gnu.org/gcc-7/changes.html
o Linaro GCC 7 monthly snapshot[1] is based on FSF GCC 7.2+svn254792 and
includes performance improvements and bug fixes backported from mainline GCC.
The contents of this snapshot will be part of the 2018.02 stable[2] quarterly
release.
This snapshot tarball is available on:
http://snapshots.linaro.org/components/toolchain/gcc-linaro/7.2-2018.01/
Interesting changes in this GCC source package snapshot include:
* Updates to GCC 7.2+svn256695
o Linaro GCC 6 monthly snapshot[1] is based on FSF GCC 6.4+svn254791 and
includes performance improvements and bug fixes backported from mainline GCC.
This snapshot contents will be part of the next maintenance release.
This snapshot tarball is available on:
http://snapshots.linaro.org/components/toolchain/gcc-linaro/6.4-2018.01/
Interesting changes in this GCC source package snapshot include:
* Updates to GCC 6.4+svn256699
o 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.
IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you.
