From: Logan Capaldo <logancapaldo@...>
Date: 2007-07-29T08:30:05+09:00
Subject: Re: checking if machine is 64-bit

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On 7/28/07, Lionel Bouton <lionel-subscription@bouton.name> wrote:
>
> Suraj Kurapati wrote:
> > Suraj Kurapati wrote:
> >
> >>   is_machine_64_bit = (2 ** 32).is_a? Fixnum
> >>
> >
> > Hmm, after reading the ri manpage for Fixnum, I found a better way:
> >
> >   (-1.size) is 4 on a 32-bit machine and 8 on a 64-bit machine.
> >
>
> I don't know if it matters to you, but IIRC there are architectures with
> different sizes for integers and memory addresses (64 bit integers with
> 32 bit addresses if memory serves).


MRI needs sizeof(long) == sizeof(void *)  (or it won't compile). MRI Fixnums
are longs.

Lionel.
>
>

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