The Linaro Toolchain Working Group (TCWG) is pleased to announce the 2017.09 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+svn252337 and includes performance improvements and bug fixes backported from mainline GCC. The contents of this snapshot will be part of the 2017.11 stable[2] quarterly release.

This snapshot tarball is available on: http://snapshots.linaro.org/components/toolchain/gcc-linaro/7.2-2017.09/

Interesting changes in this GCC source package snapshot include:

* Updates to GCC 7.2+svn252337 * Backports from mainline: - Backport of [Bugfix] [AArch32] PR target/77308 surprisingly large stack usage for sha512 on arm - Backport of [AArch32] Fix ldrd offsets - Backport of [AArch32] Remove %? string from some Advanced SIMD patterns - Backport of [AArch64] Add optimized implementation of mersenne twister - Backport of [AArch64] Add RDMA support to falkor port - Backport of [AArch64] Fix big endian float immediate moves - Backport of [AArch64] Fix missing optimization for CMP+AND - Backport of [AArch64] Fix pattern guard relaxations that are allowing more constants than they should - Backport of [AArch64] Fix ThunderX fp vectorizer cost model - Backport of [AArch64] Generate MLA when multiply + add vector by scalar - Backport of [AArch64] Implement ALU_BRANCH fusion - Backport of [AArch64] Improve aarch64 conditional compare usage - Backport of [AArch64] Improve thunderx_vect_cost some more - Backport of [AArch64] Move the check for any_condjump_p from sched-deps to target macros - Backport of [AArch64] Only allow 0s unconditionally for floating point values - Backport of [AArch64] Optimize float immediate moves-HF/DF/SF mode - Backport of [AArch64] Optimize float immediate moves-infrastructure - Backport of [AArch64] Optimize float immediate moves-testsuite - Backport of [AArch64] Optimize integer immediate moves with partial masks - Backport of [Tesstuite] Fix dg-require-stack-check - Backport of [Testsuite] [AArch32] Add -mfloat-abi=hard to arm_neon_ok - Backport of [Testsuite] [AArch64] Fix dbl_mov_immediate_1.c test - Backport of [Testsuite] [AArch64] gcc.target/aarch64/ccmp_2.c: New test - Backport of [Cleanup] [AArch32] PR target/68535 arm.c: 5 * set but not used - Backport of [Doc] [AArch64] Clean up AArch64 options

o Linaro GCC 6 monthly snapshot[1] is based on FSF GCC 6.4+svn252072 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/6.4-2017.09/

Interesting changes in this GCC source package snapshot include:

* Updates to GCC 6.4+svn252072

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[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.