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104 lines
4.2 KiB
Text
104 lines
4.2 KiB
Text
Release notes for
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*************************************************
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GNU Tools for ARM Embedded Processors 4.8
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- Q1 2014
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*************************************************
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This release includes the following items:
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* Bare metal EABI pre-built binaries for running on a Windows host
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* Bare metal EABI pre-built binaries for running on a Linux host
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* Bare metal EABI pre-built binaries for running on a Mac OS X host
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* Source code package (together with build scripts and instructions to setup
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build environment), composed of:
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* gcc : ARM/embedded-4_8-branch revision 208322
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http://gcc.gnu.org/svn/gcc/branches/ARM/embedded-4_8-branch/
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* binutils : 2.23 with mainline backports
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git://sourceware.org/git/binutils.git commit 8ea85793ab9a147f826a2d30ff612d6e77d02225
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* newlib : 2.1.0 with mainline backports
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git://sourceware.org/git/newlib.git commit e14046f93c76ef701d8ad133d0ea2b96d3c1b578
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* gdb : 7.6 without target sim support
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git://sourceware.org/git/gdb.git commit 7fc7df8816e69c7478d09c6f3447b83f28532711
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* cloog 0.18.0 :
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ftp://gcc.gnu.org/pub/gcc/infrastructure/cloog-0.18.0.tar.gz
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* expat 2.0.1 :
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http://jaist.dl.sourceforge.net/project/expat/expat/2.0.1/expat-2.0.1.tar.gz
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* gmp 4.3.2 : ftp://gcc.gnu.org/pub/gcc/infrastructure/gmp-4.3.2.tar.bz2
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* libelf 0.8.13 : http://www.mr511.de/software/libelf-0.8.13.tar.gz
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* libiconv 1.14 :
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http://ftp.gnu.org/gnu/libiconv/libiconv-1.14.tar.gz
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* mpc 0.8.1 : ftp://gcc.gnu.org/pub/gcc/infrastructure/mpc-0.8.1.tar.gz
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* mpfr 2.4.2 : ftp://gcc.gnu.org/pub/gcc/infrastructure/mpfr-2.4.2.tar.bz2
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* isl 0.11.1 : ftp://gcc.gnu.org/pub/gcc/infrastructure/isl-0.11.1.tar.bz2
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* zlib 1.2.5 and a makefile patch :
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http://sourceforge.net/projects/libpng/files/zlib/1.2.5/zlib-1.2.5.tar.bz2/download
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* newlib-nano 2.1 : Included in source package
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* gcc-plugins (with some tweaks):
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http://gcc.gnu.org/ml/gcc-patches/2013-05/msg00667.html
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Supported hosts:
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* Windows 7 32/64 bits (with installer and alternative zip package)
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* Linux 32/64 bits
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- Ubuntu 8.x or later (tarball)
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- Ubuntu 10.04/12.04/13.04/13.10 (tarball and PPA)
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- RHEL 4/5 (tarball)
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* Mac OS X 10.7.3 and newer 64 bits (tarball)
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Supported target OS:
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* Bare metal EABI only
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Features:
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* All GCC 4.8 features, plus latest mainline features
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- Cortex-R7 support
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* Additional code size optimizations
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- Don't expand multiply instruction for Thumb-1.
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- Avoid unnecessary lr save instruction for Thumb-1.
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* Newlib-nano: newlib branch optimized for code size
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* Cortex-A profile multilib
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* Link Time Optimization (LTO)
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* A new compiler option -mslow-flash-data to minimize the literal load to
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boost performance for some armv7-m targets.
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* A new compiler option -mpic-data-is-text-relative to enable/disable
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addressing data with PC relative.
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* Avoid missing _sbrk issue when .specs is used.
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* Support multiple RAM sessions in startup code.
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* A GCC plugin to optimize Finite State Machine program.
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Tests:
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* Tested on a variety of Cortex-M0/M0+/M3/M4/A9 boards
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* Tested on Qemu
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Important bugs fixed in 4.8 2014q1 update release:
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* Incorrect write to packed field when strict-volatile-bitfields enabled
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56997
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https://bugs.launchpad.net/gcc-arm-embedded/+bug/1197604
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* ICE reload1.c:1058 using 4.8 with mthumb fomit-frame-pointer
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https://bugs.launchpad.net/gcc-arm-embedded/+bug/1278004
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* Fix ARM NAN fraction bits
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https://sourceware.org/ml/libc-alpha/2014-02/msg00740.html
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* Unable to redefine weak function in -flto incrementally-linked executable
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https://sourceware.org/bugzilla/show_bug.cgi?id=15323
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* ICE on Windows with due to mingw version too old
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https://bugs.launchpad.net/gcc-arm-embedded/+bug/1267504
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Known Changes and Issues:
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* Unlike the previous releases, this release O2 optimization level doesn't
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unroll loop. To tune the strategy to get better performance for your
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case, please refer to unrolling related parameters in associated gcc manual.
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* The gcc regression test case pr42575.c now fails due to suboptimal code
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on 64-bit integer multiply caused by gcc new rtx cost model.
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* Ubuntu 13.10 PPA release doesn't have documentation due to incompatibility
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to latest texinfo.
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