Date: Sat, 30 Aug 2003 13:40:22 -0700 (PDT) From: Larry Rosenman <ler@lerctr.org> To: freebsd-bugs@FreeBSD.org Subject: Re: misc/56206: src/sys/sys/cdefs.h uses PreProcessor variables that aren't defined, causing noisy warnings. Message-ID: <200308302040.h7UKeMFF055581@freefall.freebsd.org>
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The following reply was made to PR misc/56206; it has been noted by GNATS. From: Larry Rosenman <ler@lerctr.org> To: Garrett Wollman <wollman@khavrinen.lcs.mit.edu> Cc: FreeBSD-gnats-submit@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@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 Phone: +1 972-414-9812 E-Mail: ler@lerctr.org US Mail: 1905 Steamboat Springs Drive, Garland, TX 75044-6749
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