From: "Sandor Szücs" <sandor.szuecs@...>
Date: 2009-02-03T06:50:41+09:00
Subject: Re: How to tell if one is running 32 or 64 bit Ruby on Mac OS X?


On 02.02.2009, at 21:45, Timo Geusch wrote:

> Wes Gamble <weyus@att.net> writes:
>
>>> Maybe
>>> ruby -v
>>> ?
>>
>> Output of ruby -v:
>>
>> ruby 1.8.6 (2008-03-03 patchlevel 114) [universal-darwin9.0]
>>
>> Does "universal-darwin9.0" imply 32-bit?
>
> Not really - a universal binary is one that works both on the older
> PowerPC architecture and the Intel Macs...


Just to add a universal binary is a container binary, in which you
can add several CPU architectures. Use `lipo' if you want more
information or add/delete architectures.

$ lipo -detailed_info /usr/bin/ruby
Fat header in: /usr/bin/ruby
fat_magic 0xcafebabe
nfat_arch 2
architecture ppc7400
     cputype CPU_TYPE_POWERPC
     cpusubtype CPU_SUBTYPE_POWERPC_7400
     offset 4096
     size 13776
     align 2^12 (4096)
architecture i386
     cputype CPU_TYPE_I386
     cpusubtype CPU_SUBTYPE_I386_ALL
     offset 20480
     size 17824
     align 2^12 (4096)

If you want to run it on a specific platform use `arch'
$ arch -arch x86_64  /usr/bin/ruby
arch: posix_spawnp: /usr/bin/ruby: Bad CPU type in executable
zsh: exit 1     arch -arch x86_64 /usr/bin/ruby
$ arch -arch ppc  /usr/bin/ruby
^C

The manpage of `arch' :
-------------8<-------------
     The arch_name argument must be one of the currently supported  
architectures:

            i386    32-bit intel

            ppc     32-bit powerpc

            ppc64   64-bit powerpc

            x86_64  64-bit intel
------------->8-------------

regards, Sandor Szücs
--