GCC 4.9 Release Series
Changes, New Features, and Fixes

Caveats

More information on porting to GCC 4.9 from previous versions of GCC can be found in the porting guide for this release.

General Optimizer Improvements

New Languages and Language specific improvements

Ada

C family

C

C++

Runtime Library (libstdc++)

Fortran

Go

New Targets and Target Specific Improvements

AArch64

ARC

ARM

IA-32/x86-64

MSP430

NDS32

Nios II

PowerPC / PowerPC64 / RS6000

S/390, System z

RX

SH