The Linaro Binary Toolchain
The Linaro GCC 7.5-2019.12 Release is now available.
*Notice*: GCC 7.1 ABI change for arm*-*-* targets, and note for
aarch64*-*-* targets
From GCC 7.1 release notes:
On ARM targets (arm*-*-*), a bug introduced in GCC 5 that affects
conformance to the procedure call standard (AAPCS) has been fixed. 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. This is an ABI change. If the option -Wpsabi is enabled (on
by default) the compiler will emit a diagnostic note for code that
might be affected.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77728
GCC 5 and GCC 6 releases will continue to be affected by the ABI bug,
since changing ABI in these releases is not practical. A warning
enabled by -Wpsabi option was added to GCC 5 and GCC 6 toolchains to
diagnose codebases that might be affected by the ABI bug.
Additionally, this same bug was present in AArch64 backend in
development versions of GCC 7. There was no releases of GCC with this
bug present in AArch64 backend, therefore the release notes does not
mention this. However, be advised that any code bases built with
development versions of GCC 7 need to be recompiled with released
version of GCC 7 to conform to ABI.
For an explanation of GCC 7 series changes please see the following
website:
https://gcc.gnu.org/gcc-7/changes.html
For help in porting to GCC 7 please see the following explanation:
https://gcc.gnu.org/gcc-7/porting_to.html
Download release packages from:
(sources)
http://releases.linaro.org/components/toolchain/gcc-linaro/7.5-2019.12/
(binaries)
http://releases.linaro.org/components/toolchain/binaries/7.5-2019.12/
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+Triples
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 7.5-2019.12
http://releases.linaro.org/components/toolchain/gcc-linaro/7.5-2019.12/
FSF glibc 2.25 (release/2.25)
https://lists.gnu.org/archive/html/info-gnu/2017-02/msg2.html
Newlib 2.5 (newlib-2_5_0 tag)
https://sourceware.org/ml/newlib/2016/msg01191.html
GNU Binutils 2.28 (users/linaro/binutils-2_28-branch)
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;a=blob_plain;f=binutils/NEWS;hb=refs/tags/binutils-2_28
FSF GDB 8.3 (gdb-8.3-branch)
https://lists.gnu.org/archive/html/info-gnu/2019-05/msg7.html
Linaro toolchain package git branches are hosted at:
http://git.linaro.org/toolchain
NEWS for GCC 7 (as of Linaro GCC 7.5-2019.12)
==
* Runtest and gdbserver are no longer installed in the toolchain bin/
directory. Binary releases no longer include runtest at all, and
gdbserver is a target tool; it is now shipped in the sysroot under
usr/bin/.
LDTS case #2211: gdbserver and runtest in GCC binary release are in
the wrong place or have the wrong name
* Gdbserver is no longer linked statically, because this is currently
unsupported.
Linaro bugzilla #3344: gdbserver broken in Linaro 2017.02
https://bugs.linaro.org/show_bug.cgi?id=3344
* The Linaro GCC 7.4-2019.01 snapshot added a fix for Linaro bug 4007:
"Internal compiler error with -mcpu=thunderx2t99".
* The Linaro GCC 7.2-2017.09 snapshot added float and integer moves
improvement for AArch64 targets.
* The Linaro GCC 7.1-2017.07 snapshot added prefetching configuration
improvement for AArch64 targets and laid groundwork to enabling
prefetching in more cases.
* Previous MinGW hosted version of Linaro GCC C preprocessor failed to
convert character set used for string, character constants, etc. This
is fixed in this release.
Linaro bugzilla #3040 : CC1 and cc1plus cannot convert UTF-8.
https://bugs.linaro.org/show_bug.cgi?id=3040
* Performance related backports from the following snapshots have been
included: Linaro GCC 7.1-2017.05, Linaro GCC 7.1-2017.06, Linaro GCC
7.1-2017.07, Linaro GCC 7.2-2017.08, Linaro GCC 7.2-2017.09, Linaro
GCC 7.2-2017.10, Linaro GCC 7.2-2018.04, Linaro GCC
