RealView Compilation Tools Compiler Reference Guide - ARM ...

Compiler-specific Features
4.3 Function 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 summarizes the available function attributes.
Table 4-3 Function attributes supported by the compiler and their equivalents
Function attribute
non-attribute equivalent
__attribute__((alias)) -
__attribute__((always_inline))
__attribute__((const))
__forceinline
__pure
__attribute__((deprecated)) -
__attribute__((malloc)) -
__attribute__((noinline))
__attribute__((noreturn))
__declspec(noinline)
__declspec(noreturn))
__attribute__((pure)) -
__attribute__((unused)) -
__attribute__((used)) -
__attribute__((weak))
__weak
4.3.1 __attribute__((alias))
This function attribute enables you to specify multiple aliases for functions.
Where a function is defined in the current translation unit, the alias call is replaced by a
call to the function, and the alias is emitted alongside the original name. Where a
function is not defined in the current translation unit, the alias call is replaced by a call
ARM DUI 0348A Copyright © 2007, 2010 ARM Limited. All rights reserved. 4-29
Non-Confidential