Release notes for
*************************************************
GNU Tools for ARM Embedded Processors 5
                               - Q1 2016
*************************************************

This release includes the following items:
* Bare metal EABI pre-built binaries for running on a Windows host
* Bare metal EABI pre-built binaries for running on a Linux host
* Bare metal EABI pre-built binaries for running on a Mac OS X host
* Source code package (together with build scripts and instructions to setup
  build environment), composed of:
  * gcc : ARM/embedded-5-branch revision 234589
    http://gcc.gnu.org/svn/gcc/branches/ARM/embedded-5-branch/

  * binutils : 2.26 prerelease with mainline backports
    git://sourceware.org/git/binutils-gdb.git commit de92984250bc45388b819b9879a857029c8847e6

  * newlib and newlib-nano : current master with mainline backports
    git://sourceware.org/git/newlib-cygwin.git commit c8022ae3f0b6e2652c59932aaf7609725842a987

  * gdb : 7.10 without target sim support
    git://sourceware.org/git/binutils-gdb.git commit 718b36fead887693158396b948d7f409b987c053

  * cloog 0.18.0 :
    ftp://gcc.gnu.org/pub/gcc/infrastructure/cloog-0.18.0.tar.gz

  * expat 2.0.1 :
    http://jaist.dl.sourceforge.net/project/expat/expat/2.0.1/expat-2.0.1.tar.gz

  * gmp 4.3.2 : ftp://gcc.gnu.org/pub/gcc/infrastructure/gmp-4.3.2.tar.bz2

  * libelf 0.8.13 : http://www.mr511.de/software/libelf-0.8.13.tar.gz

  * libiconv 1.14 :
    http://ftp.gnu.org/gnu/libiconv/libiconv-1.14.tar.gz

  * mpc 0.8.1 : ftp://gcc.gnu.org/pub/gcc/infrastructure/mpc-0.8.1.tar.gz

  * mpfr 2.4.2 : ftp://gcc.gnu.org/pub/gcc/infrastructure/mpfr-2.4.2.tar.bz2

  * isl 0.12.2 : ftp://gcc.gnu.org/pub/gcc/infrastructure/isl-0.12.2.tar.bz2

  * zlib 1.2.8
    http://sourceforge.net/projects/libpng/files/zlib/1.2.8/zlib-1.2.8.tar.gz/download

Supported hosts:
* Windows 7 32/64 bits (with installer and alternative zip package)
* Linux 32/64 bits
  - Ubuntu 8.x or later (tarball)
  - Ubuntu 12.04/14.04/15.04/15.10 (tarball and PPA)
  - RHEL 4/5/6/7 (tarball)
* Mac OS X 10.7.3 and newer 64 bits (tarball)

Supported target OS:
* Bare metal EABI only.

Features:
* All GCC 5 features, plus latest mainline features:
  + Cortex-R8 support
  + Cortex-M7 performance tuning
  + optimization of manual little endian and big endian loads
  + improved jump threading removing the need for -ftree-switch-shortcut
* ARMv8-M Baseline and Mainline alpha support:
  + atomics not included for ARMv8-M Baseline
  + ARMv8-M Security Extensions Alpha support
* Thumb-1 library optimizations
  + https://gcc.gnu.org/ml/gcc-patches/2015-10/msg01282.html
* CRC optimization
  + https://gcc.gnu.org/ml/gcc-patches/2015-11/msg02046.html
* Smaller terminate handler for newlib-nano

Tests:
* Tested on a variety of Cortex-M0/M0+/M3/M4/M7/A9 boards
* Tested on Qemu
* Tested on ARM Fast Models

Important bugs fixed in 5 release:
* https://answers.launchpad.net/gcc-arm-embedded/+question/267037
* https://bugs.launchpad.net/gcc-arm-embedded/+bug/1534360
* https://answers.launchpad.net/gcc-arm-embedded/+question/286502
* A bug that caused gdb's target remote command to behave unexpectedly when
  debugging simple programs

Known Changes and Issues:
* Thumb1 code size regression due to new register allocation:
  https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61578
  https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59535
A workaround is to disable it by option -mno-lra.