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13.16 func

The func module makes sure that you can use the predefined identifier __func__ as defined by C99 in your code.

A small example is:

#include <config.h>
#include <stdio.h> /* for printf */

int main (void)
    printf ("%s: hello world\n", __func__);

Note that sizeof cannot be applied to __func__: On SunPRO C compiler, sizeof __func__ evaluates to 0.