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.
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