Done  - feel free to improve it
http://wiki.github.com/ffi/ffi/using-ruby-ffi-on-osx-with-mixed-architectures-universal-binaries

Justin

On Mar 10, 9:46 am, Wayne Meissner <wmeiss...@gmail.com> wrote:

> You are now the honorary universal binary expert for ruby-ffi on
> MacOS.  Turn your email thread into a FAQ and put it up on the wiki.
>
> On 10 March 2010 00:56, macarthy <justin.maccar...@gmail.com> wrote:
>
>
>

> > Answering my own question, since I can't recompile the lib as 64bit I
> > was able to run ruby as 32 bit and ffi works fine, Commands and output
> > below.

>

> > $ lipo -info /usr/local/lib/libmylib.dylib
> > Non-fat file: /usr/local/lib/libmylib.dylib is architecture: i386

>

> > $ lipo -detailed_info /usr/bin/ruby
> > Fat header in: /usr/bin/ruby
> > fat_magic 0xcafebabe
> > nfat_arch 3
> > architecture x86_64
> >    cputype CPU_TYPE_X86_64
> >    cpusubtype CPU_SUBTYPE_X86_64_ALL
> >    offset 4096
> >    size 14176
> >    align 2^12 (4096)
> > architecture i386
> >    cputype CPU_TYPE_I386
> >    cpusubtype CPU_SUBTYPE_I386_ALL
> >    offset 20480
> >    size 14112
> >    align 2^12 (4096)
> > architecture ppc7400
> >    cputype CPU_TYPE_POWERPC
> >    cpusubtype CPU_SUBTYPE_POWERPC_7400
> >    offset 36864
> >    size 13904
> >    align 2^12 (4096)

>

> > $ arch -arch i386 /usr/bin/ruby libmylib.rb

>

> >> Hi all,

>

> >> Can someone explain this error ? Obviously an architecture mismatch of
> >> some sort, how does one got about fixing this? Or compile libmylib as
> >> a different arch (or as several ? )

>

> >> /Library/Ruby/Gems/1.8/gems/ffi-0.6.2/lib/ffi/library.rb:61:in
> >> `ffi_lib': Could not open library 'libmylib.dylib':
> >> dlopen(libmylib.dylib, 9): no suitable image found.  Did find:
> >> (LoadError)

>

> >> /usr/local/lib/libmylib.dylib: mach-o, but wrong architecture. Could
> >> not open library 'libmylib': dlopen(libmylib, 9): image not found
> >>         from /Library/Ruby/Gems/1.8/gems/ffi-0.6.2/lib/ffi/library.rb:
> >> 43:in `map'
> >>         from /Library/Ruby/Gems/1.8/gems/ffi-0.6.2/lib/ffi/library.rb:
> >> 43:in `ffi_lib'
> >>         from xxx.rb:14

>

> >> otool gives me this ...

>

> >>  otool -h /usr/local/lib/libmylib.dylib

>

> >> /usr/local/lib/libmylib.dylib:
> >> Mach header
> >>       magic cputype cpusubtype  caps    filetype ncmds sizeofcmds
> >> flags
> >>  0xfeedface       7          3  0x00          6    20       2404
> >> 0x00118085

>

> >> Thanks

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