From: Luis Lavena <luislavena@...>
Date: 2007-12-28T23:55:04+09:00
Subject: Re: testing for 64-bit environment

On Dec 28, 2:05 am, justincoll...@ucla.edu wrote:
> Quoting Rob Biedenharn <R...@AgileConsultingLLC.com>:
>
>
>
>
>
> > On Dec 27, 2007, at 10:59 PM, Tom Metge wrote:
>
> >> in case anyone else is wondering, my solution:
>
> >> arch = `uname -i`
>
> >> tom
>
> >> On Dec 27, 2007, at 8:15 PM, Tom Metge wrote:
>
> >>> subject says it all- anyone know a way to determine if the host
> >>> system is 64-bit?  i need to load a different module for different
> >>>  environments.
>
> >>> thanks,
> >>> tom
>
> > I only have a 32-bit system to try, but the Pickaxe seems to indicate
> > that Fixnum.size is the bytes in the machine representation of a Fixnum.
>
> > On my Intel MacBookPro:
>
> > irb> Object::PLATFORM
> > => "universal-darwin9.0"
> > irb> 1.size
> > => 4
> > irb> (2**30 - 1).class
> > => Fixnum
> > irb> (2**30 - 1).size
> > => 4
> > irb> (2**31 - 1).class
> > => Bignum
> > irb> (2**31 - 1).size
> > => 4
> > irb> (2**32 - 1).size
> > => 4
> > irb> (2**33 - 1).size
> > => 8
> > irb> (2**33 - 1).class
> > => Bignum
>
> > Note that Fixnum can hold 31 bits (30 + sign bit) and Bignum jumps from
> > 4 bytes to 8 bytes.
>
> > What do you get for 1.size on a 64-bit platform?
>
> > -Rob
>
> > Rob Biedenharn            http://agileconsultingllc.com
> > R...@AgileConsultingLLC.com
>
> irb(main):001:0> RUBY_PLATFORM
> => "x86_64-linux"
> irb(main):002:0> 1.size
> => 8
>

Please note that RUBY_PLATFORM indicates on which platform ruby was
built, but not the current host platform.

On Windows x64, I can build 32 bits or 64 bits application and run
them side by side.

One-Click installer reports me i386-mswin32 even that I'm on x64 HOST
OS.

Luis