From: Rob Biedenharn <Rob@...>
Date: 2009-02-03T22:31:17+09:00
Subject: Re: How to tell if one is running 32 or 64 bit Ruby on Mac O

On Feb 3, 2009, at 7:07 AM, hengist podd wrote:

> Wes Gamble wrote:
>> All,
>>
>> A friend just bought a new Mac and is trying to figure out whether  
>> they
>> have 32 or 64 bit Ruby installed.  This is the output of "file `which
>> ruby`":
>>
>> /usr/bin/ruby: Mach-O universal binary with 2 architectures
>> /usr/bin/ruby (for architecture ppc7400):       Mach-O executable ppc
>> /usr/bin/ruby (for architecture i386):  Mach-O executable i386
>>
>> Can't really tell from this.  Does anyone know definitively if Mac  
>> OS X
>> is still shipping with a 32 - bit version of Ruby or if there is a  
>> way
>> to check?
>
> The stock Ruby 1.8.6 installation on 10.5 consists of a 4-way fat  
> (ppc +
> ppc64 + i386 + x86_64) framework build which you'll find in
> /System/Library/Frameworks, with a 32-bit fat command line interpreter
> symlinked to /usr/bin/ruby. This means Ruby will run as 32-bit in 32- 
> bit
> processes (e.g. when running scripts via /usr/bin/ruby) and as 64- 
> bit in
> 64-bit processes.
>
> HTH
>
> has
> --
> Control AppleScriptable applications from Python, Ruby and ObjC:
> http://appscript.sourceforge.net
>
> -- 


This came up at least once before so a search of the archive may yield  
a better answer, but one possible way is to see how big a Fixnum is in  
bytes:

$ ruby -v
ruby 1.8.6 (2008-03-03 patchlevel 114) [universal-darwin9.0]
$ ruby -e "puts 1.size"
4

-Rob

Rob Biedenharn		http://agileconsultingllc.com
Rob@AgileConsultingLLC.com