Re: compiling multiple source files and static functions

From: David Resnick (dresnick_at_N.o.S.p.A.m.p.l.e.a.s.e.alum.mit.edu)
Date: 01/28/05 

Date: Fri, 28 Jan 2005 09:07:39 -0500

beetle wrote:
> Hi,
>
> I'm compiling multiple source files which hold some static
> functions(). The compiler `gcc' won't compile them and spit's errors
> like:
>
> warning: `cmpr' defined but not used
> undefined reference to `cmpr'
>
> What options should I give gcc to make sure that it knows that the
> static functions are used within the same program ?
>
> Thnkx.. a lot.
>
> Beetle.

Um, if it is a static function and not referenced within that source
file than it can't be used (it isn't available to the linker, other
translation units don't know about it). Only way a static function
can normally be used outside its file is if you passed a pointer to it
back via some function, in which case gcc wouldn't gripe. That said,
I think you are looking for the gcc unused attribute:.

#include <stdio.h>
static void dead_func(void) __attribute__ ((unused));
int main(void)
{
   puts("hello world");
   return 0;
}
static void dead_func(void)
{
   puts("I don't get called");
}

Above gets no complaints with -Wall.

-David

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