About This Manual The ARM Optimizing C/C++ Compiler User‘s Guide explains how to use these compiler tools： ? Compiler ? Library build utility ? C++ name demangler The compiler accepts C and C++ code conforming to the International Organization for Standardization （ISO） standards for these languages. The compiler supports the 1989 version of the C language and the 2003 version of the C++ language. This user’s guide discusses the characteristics of the C/C++ compiler. It assumes that you already know how to write C/C++ programs. The C Programming Language （second edition）， by Brian W. Kernighan and Dennis M. Ritchie， describes C based on the ISO C standard. You can use the Kernighan and Ritchie （hereafter referred to as K&R） book as a supplement to this manual. References to K&R C （as opposed to ISO C） in this manual refer to the C language as defined in the first edition of Kernighan and Ritchie‘s The C Programming Language.