* ldlang.c (load_symbols): Check for archive before object. Use

	* ldlang.c (load_symbols): Check for archive before object.  Use
	bfd_check_format_matches, and, if ambiguous, print a list of
	matching formats.  If file format is not recognized, treat file as
	a linker script.
	* ldgram.y (yyerror): If assuming an object file is a script,
	mention that.  Tweak the format of the error messages.
	* ldlex.l (lex_warn_invalid): If assuming an object is a script,
	guess that this is not actually a script, and just report that the
	file format was not recognized.
	* ld.texinfo (Options): Admit that -( may be used more than once.
	Add note that unrecognized object files are now treated as linker
	scripts.

	* ldfile.c (ldfile_input_filename): Make const.
	(ldfile_assumed_script): New variable.
	(try_open): Change arguments types to const.
	(ldfile_find_command_file): Likewise.
	(ldfile_open_command_file): Likewise.  Also, set lineno to 1.
	* ldfile.h: Update declarations for ldfile.c changes.
	* ldlex.l: Include <ctype.h>.
	(file_name_stack): Change to be const char *.
	(lineno_stack): New static variable.
	(<<EOF>>): Set lineno as well as ldfile_input_filename.
	(lex_push_file): Make name argument const.  Initialize
	lineno_stack entry.
	(lex_redirect): Initialize lineno_stack entry.
	(lex_warn_invalid): Handle non printable characters nicely.
	* ldlex.h (lex_push_file): Declare second argument as const.

	* ldgram.y (ifile_p1): Recognize GROUP.
	* ldlex.l: Recognize GROUP.
	* ld.texinfo (Option Commands): Document GROUP.