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.
== Progress ==
o LLVM
* Bugzilla 33011 (MVN instruction "Upredictable" bit patterns incorrect):
- Working on upstream comments
* Working on more unpredictable handling in Tablegen
* Fixing an issue with registers class in peephole optimization
(exhibited by unpredictable patches).
* Buildbots babysitting: investigated OOM issue, offending patch reverted.
o Misc
* Various meetings and discussions.
# Progress #
* GDB is confused by the line table generated by GCC with -gcolumn-info
PR 22531. [2/5]
Chat with other two people who are changing the same file, and they
are OK to get my changes first. Commit one obvious patch, and testing
one patch series for refactor.
* TCWG-181, GDB compile feature. [2/5]
Many new test failures in gdb.compile, because it is not supported on
arm and aarch64, but we have no way to disable them. Commit two fixes
to get test better, but still many fails on arm-linux. I think I
still need a patch to disable the test form arm-linux.
* TCWG-1040, SVE patches review. [1/5]
Review Alan's patches.
# Plan #
* PR 22531, upstream preparatory patches,
* Answer questions to my pending patch series, TCWG-1292.
--
Yao Qi
== Progress ==
* GCC
- FDPIC
- fixed crash during program startup (self-relocation)
- CI loop now almost green
* GCC upstream validation:
- reported a few of regressions
- committed a few minor testsuite fixes
* Infrastructure:
* misc (conf-calls, meetings, emails, ....)
== Next ==
* GCC/FDPIC
* GCC upstream validation
Hi, all
I have updated my test case:
Compile passed but failed while linking.
wentao@ubuntu:~/test/lamda$ cat a.cc
#include <iostream>
using namespace std;
int main()
{
auto f = [=]() {
cout <<"Hello world"<<endl;
};
f();
return 0;
}
wentao@ubuntu:~/test/lamda$ arm-eabi-g++ --std=gnu++11 a.cc -o arm32
/home/wentao/TeeOS/tools/gcc-linaro-6.3.1-2017.05-x86_64_arm-eabi/bin/../lib/gcc/arm-eabi/6.3.1/../../../../arm-eabi/lib/libstdc++.a(locale.o): In function `get_locale_cache_mutex':
/home/tcwg-buildslave/workspace/tcwg-make-release/builder_arch/amd64/label/tcwg-x86_64-build/target/arm-eabi/snapshots/gcc.git~linaro-6.3-2017.05/libstdc++-v3/src/c++98/locale.cc:36: undefined reference to `__sync_synchronize'
/home/wentao/TeeOS/tools/gcc-linaro-6.3.1-2017.05-x86_64_arm-eabi/bin/../lib/gcc/arm-eabi/6.3.1/../../../../arm-eabi/lib/libstdc++.a(future.o): In function `__future_category_instance':
/home/tcwg-buildslave/workspace/tcwg-make-release/builder_arch/amd64/label/tcwg-x86_64-build/target/arm-eabi/snapshots/gcc.git~linaro-6.3-2017.05/libstdc++-v3/src/c++11/future.cc:64: undefined reference to `__sync_synchronize'
/home/wentao/TeeOS/tools/gcc-linaro-6.3.1-2017.05-x86_64_arm-eabi/bin/../lib/gcc/arm-eabi/6.3.1/../../../../arm-eabi/lib/libstdc++.a(locale_init.o): In function `(anonymous namespace)::get_locale_mutex()':
/home/tcwg-buildslave/workspace/tcwg-make-release/builder_arch/amd64/label/tcwg-x86_64-build/target/arm-eabi/snapshots/gcc.git~linaro-6.3-2017.05/libstdc++-v3/src/c++98/locale_init.cc:66: undefined reference to `__sync_synchronize'
collect2: error: ld returned 1 exit status
wentao@ubuntu:~/test/lamda$
������: zhangwentao (M)
����ʱ��: 2018��1��10�� 10:22
�ռ���: 'linaro-toolchain(a)lists.linaro.org'
����: Huangqiang (H); Lizefan; leijitang
����: Does linaro toolchain support c++11 ??
Hi all,
I wonder if my compiler supports C++11? If not, where could I found the compiler supports c++11 (both 32bit and 64bit arm).
THANKS a lot~~~
My compiler information is as below:
wentao@ubuntu:~/test/lamda$ arm-eabi-g++ -v
Using built-in specs.
COLLECT_GCC=arm-eabi-g++
COLLECT_LTO_WRAPPER=/home/wentao/TeeOS/tools/gcc-linaro-6.3.1-2017.05-x86_64_arm-eabi/bin/../libexec/gcc/arm-eabi/6.3.1/lto-wrapper
Target: arm-eabi
Configured with: '/home/tcwg-buildslave/workspace/tcwg-make-release/builder_arch/amd64/label/tcwg-x86_64-build/target/arm-eabi/snapshots/gcc.git~linaro-6.3-2017.05/configure' SHELL=/bin/bash --with-mpc=/home/tcwg-buildslave/workspace/tcwg-make-release/builder_arch/amd64/label/tcwg-x86_64-build/target/arm-eabi/_build/builds/destdir/x86_64-unknown-linux-gnu --with-mpfr=/home/tcwg-buildslave/workspace/tcwg-make-release/builder_arch/amd64/label/tcwg-x86_64-build/target/arm-eabi/_build/builds/destdir/x86_64-unknown-linux-gnu --with-gmp=/home/tcwg-buildslave/workspace/tcwg-make-release/builder_arch/amd64/label/tcwg-x86_64-build/target/arm-eabi/_build/builds/destdir/x86_64-unknown-linux-gnu --with-gnu-as --with-gnu-ld --disable-libmudflap --enable-lto --enable-shared --without-included-gettext --enable-nls --disable-sjlj-exceptions --enable-gnu-unique-object --enable-linker-build-id --disable-libstdcxx-pch --enable-c99 --enable-clocale=gnu --enable-libstdcxx-debug --enable-long-long --with-cloog=no --with-ppl=no --with-isl=no --enable-multilib --with-multilib-list=aprofile --enable-threads=no --disable-multiarch --with-newlib --with-build-sysroot=/home/tcwg-buildslave/workspace/tcwg-make-release/builder_arch/amd64/label/tcwg-x86_64-build/target/arm-eabi/_build/sysroots/arm-eabi --with-sysroot=/home/tcwg-buildslave/workspace/tcwg-make-release/builder_arch/amd64/label/tcwg-x86_64-build/target/arm-eabi/_build/builds/destdir/x86_64-unknown-linux-gnu/arm-eabi/libc --enable-checking=release --disable-bootstrap --enable-languages=c,c++,lto --build=x86_64-unknown-linux-gnu --host=x86_64-unknown-linux-gnu --target=arm-eabi --prefix=/home/tcwg-buildslave/workspace/tcwg-make-release/builder_arch/amd64/label/tcwg-x86_64-build/target/arm-eabi/_build/builds/destdir/x86_64-unknown-linux-gnu
Thread model: single
gcc version 6.3.1 20170404 (Linaro GCC 6.3-2017.05)
wentao@ubuntu:~/test/lamda$
===>
And more, I wrote a ��hello-world�� program using c++11, it could work with host g++, but when I change to ��arm-eabi-g++��, it does not work.
Information as below:
wentao@ubuntu:~/test/lamda$ cat a.cc
#include <iostream>
using namespace std;
typedef void(*Func)();
int main()
{
Func f = [=]() {
cout <<"Hello world"<<endl;
};
f();
return 0;
}
wentao@ubuntu:~/test/lamda$ g++ a.cc -o host
a.cc: In function ��int main()��:
a.cc:10:2: warning: lambda expressions only available with -std=c++11 or -std=gnu++11 [enabled by default]
};
^
wentao@ubuntu:~/test/lamda$ ./host
Hello world
wentao@ubuntu:~/test/lamda$ arm-eabi-g++ a.cc -o arm32
a.cc: In function ��int main()��:
a.cc:10:2: error: cannot convert ��main()::<lambda()>�� to ��Func {aka void (*)()}�� in initialization
};
^
wentao@ubuntu:~/test/lamda$ arm-eabi-g++ --std=gnu++11 a.cc -o arm32 # if gives �Cstd=c++11 , the error is the same.
a.cc: In function ��int main()��:
a.cc:10:2: error: cannot convert ��main()::<lambda()>�� to ��Func {aka void (*)()}�� in initialization
};
^
wentao@ubuntu:~/test/lamda$
Hi everyone,
Note 1: Working on Linaro 50% time.
Note 2: had afternoons off for the first 2 weeks of January
== Progress ==
* Week 1 (2/1 -> 5/1) working for Arm
* Fix poor screen resolution issue
* Onboarding process:
+ read all docs, setup accounts (gmail, octopus, ...)
* PR35157 / TCWG-1308 (Crash in ARM backend for VST1d64TPseudoWB_fixed
instruction):
+ reproduce in llc under gdb, start investigating
== Plan ==
* PR35157 / TCWG-1308 (Crash in ARM backend for VST1d64TPseudoWB_fixed
instruction)
# Progress #
* GDB 8.1 release.
8.1 RC was created. 8.1 will be released soon, I think.
* GDB is confused by the line table generated by GCC with -gcolumn-info
PR 22531. [3/5]
Get a working patch, but need to upstream my refactoring first. Other
two people from upstream are also changing the same file, need to
cooperate.
* Upstream patches review, [2/5]
** Review changes to dwarf2read.c,
** Review one ARMv8 OpenOCD patch,
# Plan #
* PR 22531,
* Resume my pending patches on removing MAX_REGISTER_SIZE.
--
Yao Qi
== Progress ==
o LLVM
* TCWG-1324 (failures of Clang::atomic_ops.c and frem.ll on armv8l host):
- Fix committed in mainline as r322098
* Bugzilla 33011 (MVN instruction "Upredictable" bit patterns incorrect):
- Fix submitted upstream
* Buildbots babysitting.
* LLVM scripts reviews
o Misc
* Various meetings and discussions.
