Re: %destructor feedback

[Joel E. Denny]

On Sat, 3 Dec 2005, Paul Eggert wrote:

> "Joel E. Denny" <address@hidden> writes:
>
> > What was wrong with the cast to void?
>
> It caused lint warnings.  Please see these threads:
>
> http://lists.gnu.org/archive/html/bug-bison/2005-10/msg00000.html
> http://lists.gnu.org/archive/html/bison-patches/2005-10/msg00022.html

Thanks for the references.  Not sure why I didn't manage to locate those 
earlier.

I don't get a `null effect' warning from lint on my system.  However, for 
the current YYUSE definition, I do see this warning:

  warning: logical expression always false: op "&&"

So, I'm not sure it's really helping anyway.

How about this:

  /* Suppress unused-variable warnings by "using" E.  */
  static int yyunused;
  #define YYUSE(e) yyunused = (int*) &(e) && yyunused

No unused variables (as long as YYUSE is used somewhere), no always false 
expressions, no constant conditionals, no null effect expressions, no 
problems with structs.

Joel