Paul Smedley has released (7/5/2014) a port of GCC version 4.8.3. This compiler allows many modern projects to be compiled for OS/2. Also available are ports of 4.7.4, GCC 4.5.4 and GCC 4.4.6, as well as even older GCC versions 4.3.x, 4.0.4, and 3.4.6.
Source: OS/2 Warp News and Rumors