Date: Thu, 6 Sep 2007 12:54:39 -0700 From: Luigi Rizzo <rizzo@icir.org> To: Yan <rottled@gmail.com> Cc: current@freebsd.org Subject: Re: how to tell 64 vs 32 bit architecture ? Message-ID: <20070906125439.A84696@xorpc.icir.org> In-Reply-To: <54b90fdf0709061225q48af11c2yca8d330eff514159@mail.gmail.com>; from rottled@gmail.com on Thu, Sep 06, 2007 at 03:25:52PM -0400 References: <20070906111028.A83649@xorpc.icir.org> <54b90fdf0709061225q48af11c2yca8d330eff514159@mail.gmail.com>
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On Thu, Sep 06, 2007 at 03:25:52PM -0400, Yan wrote:
> Perhaps "if(sizeof(void*)==4) { /* 32 */} else if(sizeof(void*) ==8) { /* 64
> */ }" ?
>
> Or do you need something for the preprocessor?
preprocessor.
cheers
luigi
> -yan
>
> On 9/6/07, Luigi Rizzo <rizzo@icir.org> wrote:
> >
> > hi,
> > i was wondering what is the proper way to tell a 64 vs 32 bit
> > architecture.
> >
> > I see that some code in sys/ uses ' #ifdef __LP64__ ' but i am not
> > sure if this is generic enough (ie not gcc or FreeBSD specific),
> > and also suitable for userland (i.e. works on linux or other platforms
> > as well).
> >
> > cheers
> > luigi
> > _______________________________________________
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