RealView Compilation Tools - ARM Information Center

Compiler-specific Features
See also
• --arm_linux on page 2-9
• --hide_all, --no_hide_all on page 2-71
• __attribute__((visibility("visibility_type"))) on page 4-55.
4.3.17 __attribute__((weak))
Functions defined with __attribute__((weak)) export their symbols weakly.
Functions declared with __attribute__((weak)) and then defined without
__attribute__((weak)) behave as weak functions. This is not the same behavior as the
__weak keyword.
Note
This function attribute is a GNU compiler extension that is supported by the ARM
compiler.
Example
extern int Function_Attributes_weak_0 (int b) __attribute__ ((weak));
See also
• __weak on page 4-21.
4.3.18 __attribute__((weakref("target")))
This function attribute marks a function declaration as an alias that does not by itself
require a function definition to be given for the target symbol.
Note
This function attribute is a GNU compiler extension supported by the ARM compiler.
Syntax
__attribute__((weakref("target")))
Where target is the target symbol.
Example
In the following example, foo() calls y() through a weak reference:
ARM DUI 0348C Copyright © 2007-2010 ARM. All rights reserved. 4-41
ID101213
Non-Confidential,