The Linaro Binary Toolchain
============================
The Linaro GCC 6.3-2017.05-rc1 Release-Candidate is now available.
The GCC 6 Release series has significant changes from the GCC 5
release series. For an explanation of the changes please see the
following website:
https://gcc.gnu.org/gcc-6/changes.html
For help in porting to GCC 6 please see the following explanation:
https://gcc.gnu.org/gcc-6/porting_to.html
Download release-candidate packages from:
(sources)
http://snapshots.linaro.org/components/toolchain/gcc-linaro/6.3-2017.05-rc1/
(binaries)
http://snapshots.linaro.org/components/toolchain/binaries/6.3-2017.05-rc1/
Previous snapshots and release-candidates are at:
http://snapshots.linaro.org/components/toolchain/binaries/
Previous releases are at:
http://releases.linaro.org/components/toolchain/binaries/
A description of the arm and Aarch64 target triples can be found at:
https://collaborate.linaro.org/display/TCWGPUB/ARM+and+AArch64+Target+Tripl…
Host Requirements
==================
Linaro officially supports the current and previous Ubuntu LTS
releases (as of the time of this release). This does not mean that
the toolchain will not work on other/older Linux distributions. See
the following for the life-time of Ubuntu LTS releases.
https://wiki.ubuntu.com/Releases
The host system upon which the cross-compiler will run requires a
minimum of glibc 2.14, because of API changes to glibc's memcpy API.
https://bugs.linaro.org/show_bug.cgi?id=1869
Package Versions
=================
Linaro GCC 6.3-2017.05-rc1
http://snapshots.linaro.org/components/toolchain/gcc-linaro/6.3-2017.05-rc1/
Linaro glibc 2.23 (linaro/2.23/master)
https://lists.gnu.org/archive/html/info-gnu/2016-02/msg00009.html
Linaro newlib 2.4-2016.03 (linaro_2.4-branch)
https://sourceware.org/ml/newlib/2016/msg00370.html
Linaro binutils 2.27 (linaro-local/linaro_binutils-2_27-branch)
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;a=blob_plain;f=bin…
Linaro GDB 7.12 (gdb-7.12-branch)
https://lists.gnu.org/archive/html/info-gnu/2016-10/msg00007.html
Linaro toolchain package git branches are hosted at:
http://git.linaro.org/toolchain
NEWS for GCC 6 (as of Linaro GCC 6.3-2017.05-rc1)
==================================================
* Previous versions of the Linaro GCC 6 toolchain, when -static
-E/—dynamic-list are passed to the linker, might create executables
with dynamic sections which aren’t supported by run-time. This was
exhibited in Perf Tools build system and has been fixed upstream and
backported into Linaro Binutils 2.27 branch.
Linaro bugzilla #2926 : Perf tools compiled statically for AArch64
with Linaro release 6.1 and later ones was not statically linked.
https://bugs.linaro.org/show_bug.cgi?id=2926
* The Linaro GCC 6.3-2017.03 snapshot fixed some ILP32 issues (TLS,
exception handling, …) and these have been incorporated into this
release.
* Previous versions of the Linaro GCC 6 toolchain were incorrectly
generating floating-point code for soft-float Linux targets
(arm-linux-gnueabi, and armeb-linux-gnueabi). This escaped detection
until recently because the soft-float targeted toolchains were
configured to use general-purpose registers for passing floating-point
values (which is what you would expect for soft-float toolchains) and
the intra-routine floating-code was not noticed.
The issue would only show up on targets that were run on hardware that
truly didn't have floating-point hardware where the kernel did not
trap and emulate floating-point routines. This has been solved in
Linaro GCC 6.3-2017.02-rc2 by configuring the toolchain (using
--with-float=soft) to generate code without any floating-point
instructions at all (-mfloat-abi=soft).
https://review.linaro.org/#/c/16968/2
This change should not break compatibility between existing binaries
compiled with these toolchains since the float-point parameter passing
ABI is still the same.
* A bug/regression in the compiler has been identified whereby the
target function that is invoked when calling a "weak" function
directly is the "strong" override, whereas when calling the function
via a pointer the "weak" implementation is used. This would be
noticed as inconsistent function invocation when invoking directly vs.
invoking via function pointer. This issue only affected 32-bit arm
targets. This regression has been fixed upstream and backported into
Linaro GCC 6.3-2017.02-rc2.
GCC PR target/78253: [5/6/7 Regression] [ARM] call weak function
instead of strong when called through pointer.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78253
Linaro bugzilla #2562: ARM GCC 5.2 call weak function instead of
strong when called through pointer
https://bugs.linaro.org/show_bug.cgi?id=2562
* MS Windows does not support symlinks and the MS Windows archive
extractor does not properly deep copy the symlink target
files/directories into the symlinked directory structure when
unpacking the toolchain archive. This causes problems with missing
dependencies when using the Linaro mingw toolchains, as identified in
the following bugs:
https://bugs.linaro.org/show_bug.cgi?id=2684https://bugs.linaro.org/show_bug.cgi?id=2192https://bugs.linaro.org/show_bug.cgi?id=2762
This has been solved by copying files rather than using symlinks when
the mingw targetted toolchain archives are created.
https://review.linaro.org/#/c/16415/
* Users of Linaro's toolchain have encountered problems when building
projects with Autotools (specifically libtool):
https://bugs.linaro.org/show_bug.cgi?id=2764
The Linaro binary toolchain release contained files with a .la suffix
as artifacts of the toolchain build process. These .la files are
helper files for libtool, but unlike a gcc install tree, they are not
position independent and contain full paths. Since these artifacts
contain absolute paths they can actually mislead user invocation of
libtool into not finding required libraries (because they reference
the build tree, not the install location) and hence breaking Autotools
builds. These *.la file artifacts have been removed from Linaro
toolchain binaries because they are unnecessary for users.
* The Linaro GCC 6.3-2017.01 snapshot added further enablement for
ARMv8-M and these have been incorporated into this release.
* Compiling and statically linking some SPEC2006int tests against
tcmalloc have been failing due to a problem with glibc's memory
allocator function overrides. This was fixed upstream:
https://sourceware.org/bugzilla/show_bug.cgi?id=20432
Backported into Linaro glibc 2.23:
commit 058b5a41d56b9a8860dede14d97dd443792d064b
Author: Florian Weimer <fweimer(a)redhat.com>
Date: Fri Aug 26 22:40:27 2016 +0200
malloc: Simplify static malloc interposition [BZ #20432]
* Host binaries for x86_64 linux hosts now have symbols and debug
information stripped in order to reduce the size of the toolchain
binary archives. This reduces the archive size from 1.5G to 600M for
aarch64-linux-gnu target with the gcc-6-branch.
* The GDB version was upgraded from GDB 7.11 in the Linaro GCC
6.1-2016.08 release to GDB 7.12 in the Linaro GCC 6.2-2016.11 release.
* The Linaro GCC 6.2-2016.10 snapshot added AArch32 support for ARMv8.2
and ARMv8m, as well as some AArch64 fixes for ARMv8.2, and bug fixes
merged from FSF GCC 6.2. This is available in the binary toolchain as
of Linaro GCC 6.2-2016.11.
* Basic tuning support for the Qualcomm qdf24xx was added to the Linaro
GCC 6.2-2016.10 snapshot and is available in the binary toolchain as
of Linaro GCC 6.2-2016.11.
* IFUNC was disabled for baremetal targets, as it was causing test-suite
failures, and is presently a Linux only feature.
* The gold linker was added to this binary release.
* Backported malloc_lock fix into Linaro newlib 2.4.
commit 2665915cfc46aa6403bb2efd473c523d3167e0cb
Author: Andre Vieira (lists) <Andre.SimoesDiasVieira(a)arm.com>
Date: Thu Jun 16 12:23:51 2016 +0100
Re-enable malloc_lock for newlib-nano
* Backported rawmemchr patch into Linaro newlib 2.4.
commit e7b1ee2ea6aa3ee1da41976407410e6202a098c5
Author: Wilco Dijkstra <Wilco.Dijkstra(a)arm.com>
Date: Thu May 12 16:16:58 2016 +0000
Add rawmemchr
* Backported strlen fix when using Thumb-2 and -Os -marm into Linaro
newlib 2.4.
commit 5c02bcc086a96b174e1b9e1445a4a1770070107a
Author: Thomas Preud'homme <thomas.preudhomme(a)arm.com>
Date: Wed May 11 17:18:48 2016 -0400
Fix strlen using Thumb-2 with -Os -marm
* Backported fix for semihosting ARM when heapinfo not provided by
debugger into Linaro newlib 2.4.
commit 5c9403eaf40951f8a4f55ed65f661b485ff44be7
Author: David Hoover <spm2(a)dangerous.li>
Date: Thu Apr 21 07:12:24 2016 +0200
Fixed semihosting for ARM when heapinfo not provided by debugger.
* Merged latest FSF glibc release/2.23/master into Linaro glibc 2.23.
* Backported __ASSUME_REQUEUE_PI check Linaro glibc 2.23 branch.
commit 2d20c3bf918cd94ebd4106693adb3a5c9272baba
Author: Adhemerval Zanella <adhemerval.zanella(a)linaro.org>
Date: Tue May 17 10:16:39 2016 -0300
Add runtime check for __ASSUME_REQUEUE_PI (BZ# 18463)
* Backported removal of __ASSUME_SET_ROBUST_LIST from Linaro glibc 2.23
branch.
commit bb8f09d72756186a3d82a1f7b2adcf8bc1fbaed1
Author: Adhemerval Zanella <adhemerval.zanella(a)linaro.org>
Date: Mon May 16 19:01:10 2016 -0300
Remove __ASSUME_SET_ROBUST_LIST
* Backported removal of __ASSUME_FUTEX_LOCK_PI from Linaro glibc 2.23
branch.
commit e48b4e7fed0de06dd7832ead48bea8ebc813a204
Author: Adhemerval Zanella <adhemerval.zanella(a)linaro.org>
Date: Mon May 16 10:35:25 2016 -0300
Remove __ASSUME_FUTEX_LOCK_PI
* Merged latest FSF binutils-2_27-branch into
linaro_binutils-2_27-branch.
* The libwinpthread DLL is now copied into the host bin directory to
satisfy mingw package dependencies.
* Backported GNU Linker fix.
commit fbc6c6763e70cb2376e2de990c7fc54c0ee44a59
Author: Nick Clifton <nickc(a)redhat.com>
Date: Tue Aug 23 09:45:11 2016 +0100
Fix seg-fault in ARM linker when trying to parse a binary file.
* Backported GNU Assembler fix for PR 20364
commit 5fe7ebe5ab43750abf8f490b785d99a1e598e7fd
Author: Nick Clifton <nickc(a)redhat.com>
Date: Fri Aug 5 10:37:57 2016 +0100
Fix the generation of alignment frags in code sections for AArch64.
https://sourceware.org/bugzilla/show_bug.cgi?id=20364
* Performance related backports from the following snapshots have been
included: Linaro GCC 6.1-2016.06, Linaro GCC 6.1-2016.07, Linaro GCC
6.1-2016.08, Linaro GCC 6.2-2016.09, Linaro GCC 6.2-2016.10, Linaro
GCC 6.2-2016.11, Linaro GCC 6.2-2016.12, Linaro GCC 6.3-2017.01,
Linaro GCC 6.3-2017.02, Linaro GCC 6.3-2017.03 and Linaro GCC
6.3-2017.04.
See the following Linaro GCC snapshots:
http://snapshots.linaro.org/components/toolchain/gcc-linaro/6.1-2016.06/http://snapshots.linaro.org/components/toolchain/gcc-linaro/6.1-2016.07/http://snapshots.linaro.org/components/toolchain/gcc-linaro/6.1-2016.08/http://snapshots.linaro.org/components/toolchain/gcc-linaro/6.2-2016.09/http://snapshots.linaro.org/components/toolchain/gcc-linaro/6.2-2016.10/http://snapshots.linaro.org/components/toolchain/gcc-linaro/6.2-2016.11/http://snapshots.linaro.org/components/toolchain/gcc-linaro/6.2-2016.12/http://snapshots.linaro.org/components/toolchain/gcc-linaro/6.3-2017.01/http://snapshots.linaro.org/components/toolchain/gcc-linaro/6.3-2017.02/http://snapshots.linaro.org/components/toolchain/gcc-linaro/6.3-2017.03/http://snapshots.linaro.org/components/toolchain/gcc-linaro/6.3-2017.04/
Contact Linaro
===============
File bugs at http://bugs.linaro.org
For Linaro member support see http://support.linaro.org
For Linaro community support email linaro-toolchain(a)lists.linaro.org
# Progress #
* TCWG-1050, GDB 8.0 release. [4/10]
** Fix the new fails about the size of wchar_t on aarch64, by setting
it to 4 in default. Patch is pushed to master and 8.0 branch.
** Intel btrace python api patches are ready to commit. No idea why
he doesn't push yet.
* TCWG-1040, Review SVE patches. [4/10]
** Review some SVE GDB patches, and approved part of them. Leave the
controversial part there. Some of them are blocked by my Class-fy
regcache patches.
** Class-fy regcache. Patches are approved. Will push them in later.
Then, I'll update my unit test to value/register conversion gdbarch
hooks, and post them next week.
** GDB target description change, the preparation for adding more
hardware features, like PAUTH and SVE, and their arbitrary
combinations.
GDB side changes are done, and take i386-linux as an example to
demonstrate the the benefit of the changes.
* Misc, [2/10]
** Rebase my GDB disassembler patch, which unify the disassembler
selection in both gdb and objdump.
** Explain the GDB behavior to Linaro kernel guy who is working on
single-step in kgdb.
** Read some paper on dynamic slicing, and think about how to do it on
GDB for aarch64/arm.
# Plan #
* Holiday on Monday.
* Review kernel-awareness patches,
* Upstream my patches about unit test to value/register conversion
gdbarch hooks.
* Post my GDB target description change as an RFC, collect comments,
and think about the changes in GDBserver side (which is harder).
--
Yao Qi
* Day off (2/10)
== Progress ==
o Linaro GCC/Validation (5/10)
* Release Automation:
- 5.4 2017.05 RC1: Done
- 6.3 2017.05 RC1: still on-going
- Re-worked publication part of the process
* Debug Binutils instablities
* Reviews, backport, ...
o Misc (3/10)
* Various meetings and discussions.
== Plan ==
o Complete 6.3 RC1
o Make Linaro GCC 7 RC
o Continue release automation
== Progress ==
* [ARM GlobalISel] Support div [TCWG-1103] [1/10]
- Committed upstream
* [ARM GlobalISel] Fix fallback path [TCWG-1110] [2/10]
- Fixed and committed another issue
* [ARM GlobalISel] Fix loading i<32 from the stack [TCWG-1065] [2/10]
- Committed upstream
* Remove environment variables [TCWG-1114] [1/10]
- Committed a first patch towards fixing this
* Misc [4/10]
- Meetings, mailing lists, code reviews
- Minor GlobalISel cleanups
- Put up a cron job on llvm-tk1-test-02 to track GlobalSel
TableGen'erated code for ARM and AArch64
== Plan ==
* Out of office on Monday
* [ARM GlobalISel] Use TableGen for inst selector [TCWG-1037]
* [ARM GlobalISel] Add support for struct / array args [TCWG-1033]
* Maybe finish TCWG-1114
* Two days off, Mon and Tue [4/10]
# Progress #
* TCWG-1050, GDB 8.0 release. [2/10]
8.0 branch is created. Intel btrace python api patches are almost OK
push to master and 8.0 branch. Patches should be pushed in soon.
* TCWG-1040, Review SVE patches. [3/10]
Write unit test to value/register conversion gdbarch hooks. C++-fy
regcache so that I can easily verify the result in unit test. Still
some fails, need to investigate further. They are needed to prove SVE
changes are correct.
* Upstream patches review [1/10]
** arm software single step patch review. There is still an open
issue that the author didn't realize, that is, GDB has to understand
there may be different kind of breakpoints on the same address.
* Propose deprecate arm fpa support in GDB. I need to post the
proposal in gdb-announce(a)sourceware.org this week, according to the
deprecation process.
# Plan #
* Finish my unit test and post them for review (with regcache C++-fy
patch).
* Other issues on 8.0 release if any.
--
Yao Qi
* Public Holiday (2/10)
== Progress ==
o Linaro GCC/Validation (5/10)
* Release Automation:
- Deployed job to create snapshots/releases tags
- Working on the missing jobs to complete automation process
* GCC 7 preview release:
- Mingw builds fixed after revert
- Merged upstream GCC 7 and built binaries
- Preapring Linaro GCC 7 branch
o Misc (3/10)
* Various meetings and discussions.
== Plan ==
o Finalized 2017.05 RCs
o Continue release automation
== Progress ==
* Out of office on Monday [2/10]
* [ARM GlobalISel] Investigate divmod [TCWG-1086]
- Broke this up into several smaller stories
* [ARM GlobalISel] Support sub and mul [TCWG-1104] [1/10]
- Committed upstream
* [ARM GlobalISel] Support trunc [TCWG-1109] [1/10]
- Committed upstream
* [ARM GlobalISel] Support div [TCWG-1103] [2/10]
- Mostly done, will upstream next week
* [ARM GlobalISel] Fix fallback path [TCWG-1110] [2/10]
- Oliver from ARM has started running csmith with GlobalISel and is
finding several issues
- Fixed one of them and committed upstream
- Will commit another one next week
* Misc [2/10]
- Meetings, mailing lists, code reviews, buildbots
- Minor cleanup in the ARM backend (renamed a subtarget feature to
avoid future misuse)
== Plan ==
* [ARM GlobalISel] Fix fallback path [TCWG-1110]
* [ARM GlobalISel] Support div [TCWG-1103]
* Resume [ARM GlobalISel] Use TableGen for inst selector [TCWG-1037]
3 day week,Monday and Tuesday off
Achievements:
[TCWG-614] Range Thunks
- No review progress, blocked on a request for some refactoring to
unify the address allocation.
- Reworked my downstream patch stack in light of TCWG-1088 below.
- Spent some time refactoring the code to try and make it easier to follow.
[TCWG-1088] Refactoring of address assignment
- Committed first patch reviewed last week
- Sent out first couple of patches, no response from upstream, I'm
hoping this is due to maintainers being on Easter holiday.
Some upstream review on ILP32 patches.
Plans for next week:
- 2 day week, at ACCU2017 conference Wednesday to Friday.
- Respond to any upstream review comments.
- Find some small tasks to do to fit in the remainder of the time.
Planned Absences
- ACCU2017 next week (Wednesday to Friday)
