misc/56206: src/sys/sys/cdefs.h uses PreProcessor variables that aren't defined, causing noisy warnings.

[Larry Rosenman]

The following reply was made to PR misc/56206; it has been noted by GNATS.

From: Larry Rosenman <ler at lerctr.org>
To: Garrett Wollman <wollman at khavrinen.lcs.mit.edu>
Cc: FreeBSD-gnats-submit at freebsd.org
Subject: Re: misc/56206: src/sys/sys/cdefs.h uses PreProcessor variables
 that aren't defined, causing noisy warnings.
Date: Sat, 30 Aug 2003 15:33:56 -0500

 --On Saturday, August 30, 2003 16:26:52 -0400 Garrett Wollman 
 <wollman at khavrinen.lcs.mit.edu> wrote:
 
 >
 >>>> -#if __STDC_VERSION__ < 199901
 >>>> +#if defined(__STDC_VERSION__) && __STDC_VERSION__ < 199901
 >>>
 >>> 0 < 199901
 >> and doesn't the #if __STDC_VERSION__ < 199901 have the same effect,
 >> except
 >
 > Let me try to spell this out.
 >
 > When __STDC_VERSION__ is not defined, the preprocessor expression
 > `__STDC_VERSION < 199901' evaluates, by definition, to true, because
 > 0L < 199901L (which is why I consider this GCC warning to be bogus).
 >
 > When __STDC_VERSION__ is not defined, the preprocessor expression
 > `defined(__STDC_VERSION__) && __STDC_VERSION__ < 199901' evaluates to
 > false, because __STDC_VERSION__ is not defined.
 aha.  I think I agree with you on the Warning.
 
 Thanks for the explanation.
 
 LER
 
 
 
 
 -- 
 Larry Rosenman                     http://www.lerctr.org/~ler
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