RealView Compilation Tools Compiler Reference Guide - ARM ...

Compiler-specific Features
4.5 Variable attributes
The __attribute__ keyword enables you to specify special attributes of variables or
structure fields, functions, and types. The keyword format is either:
__attribute__ ((attribute1, attribute2, ...))
__attribute__ ((__attribute1__, __attribute2__, ...))
For example:
void * Function_Attributes_malloc_0(int b) __attribute__ ((malloc));
static int b __attribute__ ((__unused__));
Table 4-3 on page 4-29 summarizes the available variable attributes.
Table 4-5 Variable attributes supported by the compiler and their equivalents
Variable attribute
non-attribute equivalent
__attribute__((alias)) -
__attribute__((at(address))) -
__attribute__((aligned)) -
__attribute__((deprecated)) -
__attribute__((packed)) -
__attribute__((section)) -
__attribute__((transparent_union)) -
__attribute__((unused)) -
__attribute__((used)) -
__attribute__((weak))
__weak
__attribute__((zeroinit)) -
4.5.1 __attribute__((alias))
This variable attribute enables you to specify multiple aliases for variables.
Where a variable is defined in the current translation unit, the alias reference is replaced
by a reference to the variable, and the alias is emitted alongside the original name.
Where a variable is not defined in the current translation unit, the alias reference is
4-40 Copyright © 2007, 2010 ARM Limited. All rights reserved. ARM DUI 0348A
Non-Confidential