The Linaro Toolchain Working Group (TCWG) is pleased to announce the 2017.08 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+svn251138 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/7.2-2017.08/

Interesting changes in this GCC source package snapshot include:

* Updates to GCC 7.2+svn251138 * Backports from mainline: - [Bugfix] [AArch32] PR target/79665: Improve Cortex-A53 shift bypass - [Bugfix] PR lto/69866 lto1: internal compiler error: in add_symbol_to_partition_1, at lto/lto-partition.c:158 - [AArch32] Improve Cortex-A53 FP scheduler - [AArch64] Add rcpc extension - [AArch64] Do not increase data alignment at -Os and with -fconserve-stack. - [AArch64] Emit SIMD moves as mov - [AArch64] Enable software prefetching (-fprefetch-loop-arrays) for ThunderX 88xxx - [AArch64] Fix atomic_cmp_exchange_zero_reg_1.c with +lse - [AArch64] Fix failing lrint inline tests on bare-metal - [AArch64] Fix ILP32 memory access - [AArch64] Improve/correct ThunderX 1 cost model for Arith_shift - [AArch64] Improve dup pattern - [AArch64] Inline calls to lrint when possible - [AArch64] Literal vector construction through vcombine is poor - [Misc] Fold (A / (1 << B)) to (A >> B) - [Testsuite] [AArch32] Allow arm_arch_*_ok to test several macros - [Testsuite] [AArch32] Make gcc.target/arm/its.c more robust - [Testsuite] [AArch32] Require arm_arch_v8a_ok for sdiv_costs_1.c - [Testsuite] [AArch32] sdiv_costs_1.c: Disable on softfloat - [Testsuite] [AArch32] sdiv_costs_1.c: Require arm_v8_vfp_ok - [Testsuite] [AArch32] sdiv_costs_1.c: Use dg-add-options - [Cleanup] [AArch64] Rearrange the processors in aarch64-cores.def - [Cleanup] Update comment about is_leaf - [Doc] [AArch64] Document RcPc extension

o Linaro GCC 6 monthly snapshot[1] is based on FSF GCC 6.4+svn251111 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/6.4-2017.08/

Interesting changes in this GCC source package snapshot include:

* Updates to GCC 6.4+svn251111

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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.