RealView Compilation Tools Compiler Reference Guide - ARM ...

Compiler-specific Features
Function marked as used are emitted to a single section, in the order they are declared.
You can specify the section functions are placed in using __attribute__((section)).
Note
This function attribute is a GNU compiler extension that is supported by the ARM
compiler.
Note
Variables might also be marked as used, using the corresponding variable attribute
__attribute__((used)).
Example
int lose_this(int);
int keep_this(int) __attribute__((used)); // retained in object file
int keep_this_too(int) __attribute__((used)); // retained in object file
See also
• __attribute__((section)) on page 4-34.
• __attribute__((used)) on page 4-47.
4.3.12 __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 4-20.
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