Date: Wed, 16 Oct 2002 09:32:13 -0700 From: Terry Lambert <tlambert2@mindspring.com> To: Tony Finch <dot@dotat.at> Cc: Bruce Evans <bde@zeta.org.au>, Craig Rodrigues <rodrigc@attbi.com>, freebsd-standards@FreeBSD.ORG, freebsd-hackers@FreeBSD.ORG Subject: Re: Problem detecting POSIX symbolic constants Message-ID: <3DAD948D.7705B38F@mindspring.com> References: <20021012171803.F15910-100000@gamplex.bde.org> <3DA7E0F4.5988CA77@mindspring.com> <20021012151336.A24868@chiark.greenend.org.uk> <3DA883F2.33E84C@mindspring.com> <20021016121455.A3711@chiark.greenend.org.uk>
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Tony Finch wrote: > > > No -- the short-circuiting behaviour of && and || only matters if > > > you can have side-effects, which you can't in the preprocessor, > > > so there is no need to implement it (unifdef doesn't). > > > > Consider: > > > > #if _DEFINED_SUPPORTED && defined(SOMETHING) > > That's a syntax error in pre-ANSI preprocessors (unless defined() is > #defined), which won't be bypassed by evaluation shortcutting since > evaluation happens after parsing. No, it's implementation defined. -- Terry To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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