Status of C99 features in GCC 4.2 This table is based on the list in the foreword to the printed standard ISO/IEC 9899:1999 (E), as amended by ISO/IEC 9899:1999/Cor.1:2001 (E) and ISO/IEC 9899:1999/Cor.2:2004 (E).Where "Library Issue" is listed in conjunction with some other status, this means that some compiler support is needed for the library support, or desirable in conjunction with it. Note..