Now that GCC 4.8.0 has been released, welcome GCC 4.9 in its very,
very early development stages.
Business as usual with the C, C++, Fortran, Java compilers and tools
invoked as gcc49, g++49, gfortran49, gcj49 and so forth. Initially
this may be relatively stable due to the GCC 4.8.0 stabilization
efforts, but be prepared for a rough ride the coming months as this
goes through active development.