1. The GNU C compiler by Richard Stallman et al. A very high quality, very portable compiler for C, C++ and Objective C. The compiler is designed to support multiple front-ends and multiple back-ends by translating first into Register Transfer Language and from there into assembly code for the target architecture. From Linux Guide @FirstLinux

2. A compiler aimed at integrating all the optimizations and features necessary for a high-performance and stable development environment. This package is required for all other GCC compilers, namely C++, Fortran 77, Objective C and Java. If you have multiple versions of GCC installed on your system, it is preferred to type "gcc-$(gcc3.2-version)" (without double quotes) in order to use the GNU C compiler version 3.2.2. From Mandrake 9.0 RPM