gdb/

gdb/
	* arch-utils.c (target_byte_order_user): Renamed from
	target_byte_order.
	(target_byte_order_auto, selected_byte_order): Removed.
	(show_endian): Check target_byte_order_user.
	(set_endian): Always update the architecture.  Set
	target_byte_order_user after success.
	(target_architecture_auto): Removed.
	(target_architecture_user): New.
	(selected_architecture_name, show_architecture): Check it.
	(set_architecture): Set target_architecture_user after success.
	(gdbarch_from_bfd): Check the argument.
	(default_byte_order): New.
	(initialize_current_architecture): Set the global default
	architecture and endianness.
	(gdbarch_info_fill): Remove GDBARCH argument.  Do not check the
	previous architecture.  Use exec_bfd, global selected architecture
	and endianness, and global defaults.
	* arch-utils.h (selected_byte_order): Remove prototype.
	(gdbarch_info_fill): Update.
	* exec.c (exec_file_attach): Update the architecture after removing
	the current file.
	* gdbarch.sh: Update comments.
	(find_arch_by_info): Remove OLD_GDBARCH argument.  Update call to
	gdbarch_info_fill.
	(gdbarch_find_by_info): Update call to find_arch_by_info.
	* gdbarch.h, gdbarch.c: Regenerated.
	* remote-sim.c (gdbsim_open): Use TARGET_BYTE_ORDER.
gdb/doc/
	* gdbint.texinfo (Target Architecture Definition): Add new
	Initializing a New Architecture section.