Datasheet

ARM Compiler Reference

3.2 Language extensions

This section describes the language extensions supported by the ARM compilers.

3.2.1 C language extensions

The compilers support the ANSI C language extensions described below and in C and

C++ language extensions. The extensions are not available if the compiler is restricted

to compiling strict ANSI C, for example, by specifying the

-strict

compiler option.

// comments

The character sequence

starts a comment. As in C++, the comment is terminated by

the next newline character.

Note

Comment removal takes place after line continuation, so:

// this is a - \

single comment

The characters of a comment are examined only to find the comment terminator,

therefore:

•

has no special significance inside a comment introduced by

•

has no special significance inside a comment introduced by

constant expressions

Extended constant expressions, such as the following, are allowed in initializers:

int i;

int j = (int)&i; /* but not allowed by ANSI/ISO */

3.2.2 C and C++ language extensions

This section describes the extensions to both the ANSI C language, and the ISO/IEC

C++ language that are accepted by the compilers. See C language extensions for those

extensions that apply only to C. None of these extensions are available if the compiler

is restricted to compiling strict ANSI C or strict ISO/IEC C++. This is the case, for

example, when the

-strict

compiler option is specified.