Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!elroy.jpl.nasa.gov!ames!elan!tom
From: tom@elan.Elan.COM (Thomas Smith)
Newsgroups: comp.lang.c++
Subject: Re: Can I turn off specific "not used" warnings in cfront?
Message-ID: <878@elan.Elan.COM>
Date: 14 Nov 90 19:03:50 GMT
References: <1084@ntpal.UUCP>
Organization: Elan Computer Group, Inc., Mountain View, CA
Lines: 40

From article <1084@ntpal.UUCP>, by herrage@ntpal.UUCP (Robert Herrage):
> 
> 
> I'm sending this a different way since the first way hasn't been
> working very well.  So, if you're getting this again, I apologize.
> 
> Yes! You can eliminate the "not used" warnings!  Below is a simple
> example:
> 
> void funcname(
>   int x;
>   int y;
>   int z      )
> {
>   x,y; // this will eliminate the "not used" warnings
> 
>   printf( "%d", z );
> 
> }

However, this could (on some compilers) generate code for the
comma-separated expression "x,y;".  There are two other alternatives:

1) If the variable that you don't want to use is a function parameter,
   as in the example above, simply leave off the parameter name from the
   definition.  i.e.
	void funcname(int, int, int z)  { printf("%d", z); }

2) If the variable is an automatic variable or a global (such as SCCS ids)
   I found that if you define an inline function that takes a parameter,
   but has no body, no code will be generated.  i.e.
      inline void NotUsed(const void *anything) {}

      NotUsed(SCCSid);		// suppresses "not used" warning

Hope this helps,
    Thomas Smith
    Elan Computer Group, Inc.
    (415) 964-2200
    tom@elan.com, ...!{ames, uunet, hplabs}!elan!tom