objcopy - Invalid operation

[James]

Greetings-
 
I am trying to rename a symbol in an object file
called "error_msg.o" and following is its
information:

% objdump -t error_msg.o

error_msg.o:     file format mach-o-be
 
 SYMBOL TABLE:
 00000000000006a4         LC_SEGMENT.__TEXT.__cstring
 _rcsid
 00000000000003f8         LC_SEGMENT.__DATA.__data
 _copyright
 000000000000036c         LC_SEGMENT.__TEXT.__text
 __et_list
 0000000000000370         LC_SEGMENT.__TEXT.__text
 _vmsgs
 0000000000000000         *UND* _negative_message
 000000000000074c         LC_SEGMENT.__DATA.__const
 _buffer
 00000000000000bc         *UND* _volume_message
 0000000000000314 g       *UND* _add_to_error_table
 00000000000000fc g       *UND* _error_message
 0000000000000000 g       *UND* _error_table_name
 0000000000000000 g       *UND* _sprintf
 0000000000000000 g       *UND* _strcat
 0000000000000000 g       *UND* _strerror
 0000000000000000 g       *UND*
 dyld_stub_binding_helper
 
 The error messages that I receive are as follows:
  
 % objcopy --redefine-sym
 _error_message=_au_error_message error_msg.o
 objcopy: error_msg.o: Invalid operation
 
 % objcopy -F mach-o-be --redefine-sym
 _error_message=_au_error_message error_msg.o
 error_msg2.o
 objcopy: error_msg.o: Invalid operation
 
 % objcopy -I mach-o-be -O mach-o-be
 _error_message=_au_error_message error_msg.o
 error_msg2.o
 objcopy: error_msg.o: Invalid operation
 
 % objcopy -I mach-o-be -O mach-o-be error_msg.o
 error_msg2.o
 objcopy: error_msg.o: Invalid operation
 objcopy: error_msg2.o: File truncated
 % ls -l
 total 64
 -rw-r--r--  1 aojc  staff  3948 Oct 22 15:30
 error_msg.o 
 
 -rw-r--r--  1 aojc  staff    84 Oct 22 15:53
 error_msg2.o 
 
 % objdump -t error_msg2.o
 objdump: error_msg2.o: File format not recognized
 
 % objdump --help
 <snip>
 objdump: supported targets: mach-o-be mach-o-le
 mach-o-fat pef pef-xlib sym srec symbolsrec tekhex
 binary ihex
 objdump: supported architectures: powerpc:common
 powerpc:common64 powerpc:603 powerpc:EC603e
 powerpc:604 powerpc:403 powerpc:601 powerpc:620
 powerpc:630 powerpc:a35 power
 pc:rs64ii powerpc:rs64iii powerpc:7400 powerpc:e500
 powerpc:MPC8XX powerpc:970 rs6000:6000 rs600
 0:rs1 rs6000:rsc rs6000:rs2 i386 i386:x86-64 i8086
 i386:x86-64:intel i386:intel
 
 Any suggestions on how to resolve this problem? 
 Thanks!
 
 James
 
 

__________________________________
Do you Yahoo!?
The New Yahoo! Shopping - with improved product search
http://shopping.yahoo.com