🚀 go-pugleaf

In article <jqbCJtAso.1L1@netcom.com> jqb@netcom.com (Jim Balter) writes:
>In article <2gs6qk$nan@news.parc.xerox.com>,
>Marty Leisner 25733 <leisner@sdsp.mc.xerox.com> wrote:
>>I'm using:
>>
>>#define USE_VAR(var) static void * use_##var = (&use_##var, (void *) &var)
>>
>>to get around the unused warnings generated (with -Wall)
>>
>>(I'm using
>>
>>define ID_STRING(x)            static char rcsid[] = x; USE_VAR(rcsid);
>>
>>to define RCS strings).
>>
>>This doesn't seem to work in gcc 1.x, but in 2.x...
>>
>>Is it ansi C?  I understand the comma operator can appear anywhere...
>
>Nyet.  3.4 say constant expressions can't contain comma operators (sigh).
>
>But this passes gcc -Wall -pedantic:
>
>#define USE_VAR(var) static void * use_##var = 0?(void*)&use_##var:&var

What is the problem with:

#define USE_VAR(var) (void) var

christos