Updated gcc packages fix the following security issue:

Multiple integer overflow issues were found in libgfortran, the
run-time support library for the Fortran compiler. These could possibly
be used to crash a Fortran application or cause it to execute arbitrary
code CVE-2014-5044).

They also fix the following bugs:

The gcc rtl-optimization sched2 miscompiles syscall sequence wich
can cause random panic in glibc and kernel (gcc/PR61801)

clang++ fails to find cxxabi.h and cxxabi_tweaks.h during build
(mga#13543)