Date: Mon, 28 Jan 2008 19:23:50 +0300 From: Yar Tikhiy <yar@comp.chem.msu.su> To: Dag-Erling Sm?rgrav <des@des.no>, cvs-src@FreeBSD.org, src-committers@FreeBSD.org, cvs-all@FreeBSD.org, "David O'Brien" <obrien@FreeBSD.org> Subject: Re: cvs commit: src UPDATING src/include fts.h src/lib/libc/gen Makefile.inc Symbol.map fts-compat.c fts-compat.h fts.3 fts.c src/sys/sys param.h Message-ID: <20080128162350.GQ49535@comp.chem.msu.su> In-Reply-To: <20080128111434.GA68277@owl.midgard.homeip.net> References: <200801261709.m0QH9f2D024309@repoman.freebsd.org> <20080127043334.GA75235@dragon.NUXI.org> <20080127053813.GH49535@comp.chem.msu.su> <20080127094653.GA74753@dragon.NUXI.org> <20080128053514.GK49535@comp.chem.msu.su> <86odb6usm6.fsf@ds4.des.no> <20080128111434.GA68277@owl.midgard.homeip.net>
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On Mon, Jan 28, 2008 at 12:14:35PM +0100, Erik Trulsson wrote: > On Mon, Jan 28, 2008 at 11:55:29AM +0100, Dag-Erling Sm?rgrav wrote: > > > > > Userland code should be portable and useful to other systems in the > > > chosen domain of compatibility, e.g., C99 or POSIX, unless there > > > are substantial reasons for it not to. That's how different projects > > > can benefit from each other's work. > > > > Both C99 and POSIX *require* int64_t and uint64_t on all platforms that > > have 64-bit integer types. > > > > FreeBSD has never run on any platform that doesn't. I don't think > > NetBSD or OpenBSD has either, nor Solaris, nor Linux to my knowledge. > > Those are all good reasons for why using 'int64_t' would be OK. > None of it is a reason for why using 'long long' would not be OK when you > want at least 64 bits, but do not require exactly 64 bits. Thank you for telling this very valid point. People tend to forget that [u]intN_t types are actually called for only when a particular _exact_ bit width is needed, e.g., to get unsigned arithmetics modulo 2^N, or to match a hardware register or a network packet field. -- Yar
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