* cli/cli-decode.c (add_setshow_string_noescape_cmd): Return the

	* cli/cli-decode.c (add_setshow_string_noescape_cmd): Return the
	set command.
	* command.h (add_setshow_string_noescape_cmd): Update.
	* corefile.c (set_gnutarget_command): Remove trailing whitespace.
	(complete_set_gnutarget): New function.
	(_initialize_core): Set the "set gnutarget" completer.
gdb/testsuite
	* gdb.base/completion.exp: Add "set gnutarget" test.