GDB is not usable

[Richard Stanton]

I'm not sure if this is related to gdb, gcc, or upgrading to Mountain Lion a month ago (I haven't used gdb for a while), but currently I can't use gdb on my system. Here's an example where I try to debug one fairly simple program compiled using mp-gcc47.

First, to verify that the program actually runs:
mortgage:miscprog stanton$ amput 10
n =  10,  v =       4.0615855, time =  0.000 seconds

Now to debug:
mortgage:miscprog stanton$ ggdb amput
GNU gdb (GDB) 7.3
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 copying"
and "show warranty" for details.
This GDB was configured as "x86_64-apple-darwin12.1.0".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
BFD: unable to read unknown load command 0x24
BFD: unable to read unknown load command 0x2a
BFD: unable to read unknown load command 0x28
BFD: unable to read unknown load command 0x26
BFD: unable to read unknown load command 0x2b
BFD: unable to read unknown load command 0x24
BFD: unable to read unknown load command 0x2a
BFD: unable to read unknown load command 0x28
BFD: unable to read unknown load command 0x26
BFD: unable to read unknown load command 0x2b
Reading symbols from /Users/stanton/miscprog/amput...Segmentation fault: 11
mortgage:miscprog stanton$ 

I've tried using multiple other versions of gcc, and also tried gdb 7.2 instead. None of this had any effect.

Thanks for any suggestions.

Richard Stanton