Gnu Compiler Collection 4.4 (GCC4.4) is now included in this release as a Technology Preview. This collection of compilers include C, C++, and Fortran compilers along with support libraries.
Note that in the gcc44 packages, the default for gnu89-inline option has been changed to -fgnu89-inline, whereas upstream and future updates of Red Hat Enterprise Linux 5 will default to -fno-gnu89-inline. This is necessary because many headers shipped as part of Red Hat Enterprise Linux 5 expect GNU in-line semantics instead of ISO C99 semantics. These headers have not been adjusted to request GNU in-line semantics through attributes.