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Re: [libbfd] Mach-O format support ?

On Apr 14, 2010, at 11:11 AM, wrote:

> Hi,
> On Wed, 14 Apr 2010 10:49:02 +0200
> Tristan Gingold <> wrote:
>>> on Mac OS X, "nm" complains as:
>>> $ ./nm-new /usr/lib/libwrap.a 
>>> ./nm-new: /usr/lib/libwrap.a:i386: File format not recognized
>>> ./nm-new: /usr/lib/libwrap.a:powerpc:common: File format not recognized
>> Yes, nm on universal archive doesn't work, because nm doesn't handle archives of archives!
> Thank you for quick reply!
> It seems that the "ar" of GNU binutils doesn't handle
> universal binary archive directly.

It can.  It just see the universal binary as an archive.  Eg:

$ ./binutils/ar tv /bin/ls 

>  I guess the universal
> binary archive of Mac OS X is concatenated in fat binary
> format, instead of "ar" archive format.

Yes, it is a different format.

> In fact, even
> Apple's "ar" cannot parse the universal binary archive,
> it tells to split the universal binary archive by libtool/lipo
> and execute "ar" on the splitted files.
> Is there GNU replacement of Apple's lipo?

You can use binutils ar to list or extract a member of a universal binary, but you can't build a
universal binary with binutils tools.  That's something I'd like to add, but it will require a change to


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