Re: not generating unused messages

Article View: gnu.gcc.help

Article #49645

#49645

From: Jim Balter
Date: Tue, 18 Jan 1994 06:17

27 lines
1416 bytes

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


-- 
<J Q B>

Technical Details

Message-ID: <jqbCJtAso.1L1@netcom.com>

Path:

arc1-ca.pugleaf.net!gmd.de!xlink.net!howland.reston.ans.net!cs.utexas.edu!swrinde!elroy.jpl.nasa.gov!decwrl!csus.edu!netcom.com!jqb

References: <2gs6qk$nan@news.parc.xerox.com>

Show Full Headers

Complete Article Headers

X-Google-Language: ENGLISH,ASCII-7-bit
X-Google-Thread: 11318c,270e3dcf6d9d2e3f
X-Google-Attributes: gid11318c,public
X-Google-Thread: 1149ec,270e3dcf6d9d2e3f
X-Google-Attributes: gid1149ec,public
X-Google-ArrivalTime: 1994-01-18 06:22:57 PST
Newsgroups: gnu.gcc.help,comp.std.c
Path: arc1-ca.pugleaf.net!gmd.de!xlink.net!howland.reston.ans.net!cs.utexas.edu!swrinde!elroy.jpl.nasa.gov!decwrl!csus.edu!netcom.com!jqb
From: jqb@netcom.com (Jim Balter)
Subject: Re: not generating unused messages
Message-ID: <jqbCJtAso.1L1@netcom.com>
Organization: NETCOM On-line Communication Services (408 241-9760 guest)
References: <2gs6qk$nan@news.parc.xerox.com>
Date: Tue, 18 Jan 1994 06:17:12 GMT
Lines: 27

Reply to Parent Message