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

Garrett Wollman wollman at khavrinen.lcs.mit.edu
Sat Aug 30 13:30:06 PDT 2003


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

From: Garrett Wollman <wollman at khavrinen.lcs.mit.edu>
To: Larry Rosenman <ler at lerctr.org>
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 16:26:52 -0400 (EDT)

 >>> -#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.
 
 -GAWollman
 


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