Normally, the compiler warns if a variable is declared but is never referenced. This attribute informs the compiler that you expect a variable to be unused and tells it not to issue a warning if it is not used.
Note
This variable attribute is a GNU compiler extension that the ARM compiler supports.
Example
void Variable_Attributes_unused_0()
{
static int aStatic =0;
int aUnused __attribute__((unused));
int bUnused;
aStatic++;
}
In this example, the compiler warns that bUnused is declared but never
referenced, but does not warn about aUnused.
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