Features

• All GCC 8.2 features. For details on GCC 8 release series, please refer to the list of changes, new features, and fixes.
• Linaro specific pre-processor macros to ensure that this is a continuation from the Linaro releases.
• Spectre v1 mitigation backport from upstream FSF trunk include the revisions listed below. This is an initial backport of those mitigations in the GNU toolchain and should be regarded as support for prototyping and early access only. Moreover, while the backports include support for the other architectures, they are included for completeness and all issues regarding these patches must be taken up upstream in the https://gcc.gnu.org/bugzilla by reproducing the same with upstream FSF trunk. Arm is interested in feedback regarding these workarounds for Spectre v1. A description of the mitigation has been published on LWN.net.
  
  • Arm - add speculation_barrier pattern
  • AArch64 - add speculation barrier
  • AArch64 - Add new option -mtrack-speculation
  • AArch64 - disable CB[N]Z TB[N]Z when tracking speculation
  • AArch64 - new pass to add conditional-branch speculation tracking
  • AArch64 - use CSDB based sequences if speculation tracking is enabled
  • targhooks - provide an alternative hook for targets that never execute speculatively
  • pdp11 - example of a port not needing a speculation barrier
  • targhooks - Add ATTRIBUTE_UNUSED
  • x86 - add speculation_barrier pattern
  • rs6000 - add speculation_barrier pattern
  • nvptx - Define TARGET_HAVE_SPECULATION_SAFE_VALUE
  • fr30 - Define to speculation_safe_value_not_needed
  • frv - Define to speculation_safe_value_not_needed
  • iq2000 - Define to speculation_safe_value_not_needed
  • m32r - Define to speculation_safe_value_not_needed
  • mcore - Define to speculation_safe_value_not_needed
  • msp430 - Define to speculation_safe_value_not_needed
  • rx - Define to speculation_safe_value_not_needed
  • v850 - Define to speculation_safe_value_not_needed
  • stormy16 - Define to speculation_safe_value_not_needed
  • h8300 - Define to speculation_safe_value_not_needed
  • m68k - Define to speculation_safe_value_not_needed
  • mn10300 - Define to speculation_safe_value_not_needed
  • nios2 - Define to speculation_safe_value_not_needed
  • spu - Define to speculation_safe_value_not_needed
  • pa - Define to speculation_safe_value_not_needed

Changes since Arm release GCC 8.2-2018.11

• Bug 4041 - gcc-arm-8.2 toolchains do not support sanitizers
• Bug 4045 - gcc-arm-8.2-2018.08 release points to https://gcc.gnu.org/bugs/ 
• Bug 4130 - gcc8.2/AArch64: aarch64-linux-gnu-gdb: TUI mode is not supported 
• Bug 4212 - arm gcc-8 release is missing gold linke
• Each binary release file now contains manifest file with configuration flags for each toolchain component

Content

This release includes the following items:

Host requirements

The GNU Toolchains

Installation instructions

Extract XZ compressed release archive using TAR archiving utility:

$ tar -xJf gcc-arm-8.2-2019.01-x86_64-aarch64-linux-gnu.tar.xz -C /path/to/destination/directory

Compute and check MD5 checksum of XZ compressed release archives using md5sum utility:

$ md5sum --check gcc-arm-8.2-2019.01-x86_64-aarch64-linux-gnu.tar.xz.asc gcc-arm-8.2-2019.01-x86_64-aarch64-linux-gnu.tar.xz: OK

The prebuilt binary bundles can be un-tarred and executed in place. Assuming a RHEL6 host. Unpack the Linux cross toolchain:

$ mkdir install-lnx
$ tar x -C install-lnx -f <filename>.tar.xz
$ PATH=`pwd`/install-lnx/aarch64/bin:$PATH 

Known issues

• Spectre v1 mitigations are provided here for early access and thus might have stability issues. On AArch32 we are currently aware of one issue as documented at PR86951.
• GDB's Python support requires Python compiled with UCS-4 support (built with --enable-unicode=ucs4) for both hosts x86_64 and i686-mingw32.

Ask questions

For any questions, please use the Arm Communities forums.

Report bugs

Please report any bugs via the Linaro Bugzilla.