Support for GNU extensions when you run the compiler with the --gnu option. However, some extensions are also supported when you run the compiler without this option. These compilation modes are referred to as:

For a complete list of all GNU extensions, and the mode and language in which they are supported, see the chapter describing the compiler reference in RealView Compilation Tools v2.1 Compiler and Libraries Guide.

Enhanced support for ISO C++ through the Edison Design Group (EDG) front end. This provides a full C++ parser that passes a program representation to the ARM compiler for code generation. This now includes support for throwing and catching C++ exceptions.

Multifile compilation provides optimization across compile units. Use the new --multifile option to specify this behavior. Multifile compilation requires you to specify multiple files on the command line, for example:

armcc [options] --multifile ifile_1 ... ifile_n

New -O3 optimization level, that includes multifile compilation by default.

New --cpu list and --fpu list options to display details about supported CPUs and architectures.

New --min_array_alignment option to enable you to specify the minimum alignment of arrays.

New __breakpoint() intrinsic.

Noreturn functions.

--old_cfe option is now obsolete.