 GCC 4.6 supports many new Objective-C features, such as declared and synthesized properties, dot syntax, fast enumeration, optional protocol methods, method/protocol/class attributes, class extensions, and a new GNU Objective-C runtime API.It also supports the Go programming language and includes the codice_12 library, which provides quadruple-precision mathematical functions on targets supporting the codice_13 datatype.The library is used to provide the codice_14 type in GNU Fortran on such targets.