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Subject: Re: Debugging 32/64 bit binaries on os/x 10.7 with cvs gdb?
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From: Tristan Gingold <gingold@adacore.com>
In-Reply-To: <DCB78A22-26C6-4513-97B6-26EAE2A656DE@astro.princeton.edu>
Date: Wed, 30 Nov 2011 07:47:00 -0000
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References: <DCB78A22-26C6-4513-97B6-26EAE2A656DE@astro.princeton.edu>
To: Robert Lupton the Good <rhl@astro.princeton.edu>
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On Nov 29, 2011, at 9:32 PM, Robert Lupton the Good wrote:

> If I build gdb from source on os/x 10.7 and attempt to debug python (a 32=
/64 bit binary), gdb says;
>=20
>> $ ~/Src/gnu/gdb/gdb /usr/bin/python
>> GNU gdb (GDB) 7.3.50.20111109-cvs
>> Copyright (C) 2011 Free Software Foundation, Inc.
>> License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.=
html>
>> This is free software: you are free to change and redistribute it.
>> There is NO WARRANTY, to the extent permitted by law.  Type "show copyin=
g"
>> and "show warranty" for details.
>> This GDB was configured as "x86_64-apple-darwin11.2.0".
>> For bug reporting instructions, please see:
>> <http://www.gnu.org/software/gdb/bugs/>...
>> "/usr/bin/python": not in executable format: File format not recognized
>> (gdb) quit
>> $ file !$
>> file /usr/bin/python
>> /usr/bin/python: Mach-O universal binary with 2 architectures
>> /usr/bin/python (for architecture x86_64):      Mach-O 64-bit executable=
 x86_64
>> /usr/bin/python (for architecture i386):        Mach-O executable i386
>=20
> Is there a way to build gdb to work around this?

No.  Currently gdb is not able to debug fat binary.  Use lipo to extract th=
e architecture you want to use.