[RFA] Add cmd "set bfd" to make gdb handle bfd_error_file_ambiguously_recognized better

[Hui Zhu <teawater at gmail dot com>]

Hello guys,

As I said in http://sourceware.org/ml/gdb/2010-01/msg00122.html

I make patches for them.
setbfd.txt is for gdb, it add a new cmd "set bfd".  It can set the
default executable format when more than one executable format support
for the object file.
And when user load file get bfd_error_file_ambiguously_recognized, gdb
will output:
"/ls":Matching formats: elf32-nbigmips elf32-ntradbigmips
Use command "set bfd" handle it.

And I to let gdb set bfd_associated_vector, I make a patch bfd.txt.

Please help me review it.

Thanks,
Hui

2010-01-13  Hui Zhu  <teawater@gmail.com>
	* arch-utils.c (libbfd.h): New include.
	(bfds): New variable.
	(set_bfd_string): New variable.
	(show_bfd): New function.
	(set_bfd): New function.
	(_initialize_gdbarch_utils): Add new command "set bfd".
	* exec.c (exec_file_attach): Output special works when
	bfd_get_error is bfd_error_file_ambiguously_recognized.

2010-01-13  Hui Zhu  <teawater@gmail.com>
	* libbfd-in.h (bfd_associated_vector): Remove second const.
	* libbfd.h (bfd_associated_vector): Ditto.
	* targets.c (bfd_associated_vector): Ditto.
	(_bfd_associated_vector): Add DEFAULT_VECTOR.

Attachment: bfd.txt
Description: Text document

Attachment: setbfd.txt
Description: Text document