1 /* C/ObjC/C++ command line option handling.
2 Copyright (C) 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
3 Contributed by Neil Booth.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
24 #include "coretypes.h"
31 #include "langhooks.h"
32 #include "tree-inline.h"
33 #include "diagnostic.h"
35 #include "cppdefault.h"
36 #include "c-incpath.h"
37 #include "debug.h" /* For debug_hooks. */
42 #ifndef DOLLARS_IN_IDENTIFIERS
43 # define DOLLARS_IN_IDENTIFIERS true
46 #ifndef TARGET_SYSTEM_ROOT
47 # define TARGET_SYSTEM_ROOT NULL
51 #define TARGET_OPTF(ARG)
55 static cpp_options *cpp_opts;
58 static const char *this_input_filename;
60 /* Filename and stream for preprocessed output. */
61 static const char *out_fname;
62 static FILE *out_stream;
64 /* Append dependencies to deps_file. */
65 static bool deps_append;
67 /* If dependency switches (-MF etc.) have been given. */
68 static bool deps_seen;
73 /* If -lang-fortran seen. */
74 static bool lang_fortran = false;
76 /* Dependency output file. */
77 static const char *deps_file;
79 /* The prefix given by -iprefix, if any. */
80 static const char *iprefix;
82 /* The multilib directory given by -imultilib, if any. */
83 static const char *imultilib;
85 /* The system root, if any. Overridden by -isysroot. */
86 static const char *sysroot = TARGET_SYSTEM_ROOT;
88 /* Zero disables all standard directories for headers. */
89 static bool std_inc = true;
91 /* Zero disables the C++-specific standard directories for headers. */
92 static bool std_cxx_inc = true;
94 /* If the quote chain has been split by -I-. */
95 static bool quote_chain_split;
97 /* If -Wunused-macros. */
98 static bool warn_unused_macros;
100 /* If -Wvariadic-macros. */
101 static bool warn_variadic_macros = true;
103 /* Number of deferred options. */
104 static size_t deferred_count;
106 /* Number of deferred options scanned for -include. */
107 static size_t include_cursor;
109 static void set_Wimplicit (int);
110 static void handle_OPT_d (const char *);
111 static void set_std_cxx98 (int);
112 static void set_std_c89 (int, int);
113 static void set_std_c99 (int);
114 static void check_deps_environment_vars (void);
115 static void handle_deferred_opts (void);
116 static void sanitize_cpp_opts (void);
117 static void add_prefixed_path (const char *, size_t);
118 static void push_command_line_include (void);
119 static void cb_file_change (cpp_reader *, const struct line_map *);
120 static void cb_dir_change (cpp_reader *, const char *);
121 static void finish_options (void);
123 #ifndef STDC_0_IN_SYSTEM_HEADERS
124 #define STDC_0_IN_SYSTEM_HEADERS 0
127 /* Holds switches parsed by c_common_handle_option (), but whose
128 handling is deferred to c_common_post_options (). */
129 static void defer_opt (enum opt_code, const char *);
130 static struct deferred_opt
136 /* Complain that switch CODE expects an argument but none was
137 provided. OPT was the command-line option. Return FALSE to get
138 the default message in opts.c, TRUE if we provide a specialized
141 c_common_missing_argument (const char *opt, size_t code)
146 /* Pick up the default message. */
149 case OPT_fconstant_string_class_:
150 error ("no class name specified with %qs", opt);
154 error ("assertion missing after %qs", opt);
159 error ("macro name missing after %qs", opt);
168 error ("missing path after %qs", opt);
177 error ("missing filename after %qs", opt);
182 error ("missing makefile target after %qs", opt);
189 /* Defer option CODE with argument ARG. */
191 defer_opt (enum opt_code code, const char *arg)
193 deferred_opts[deferred_count].code = code;
194 deferred_opts[deferred_count].arg = arg;
198 /* Common initialization before parsing options. */
200 c_common_init_options (unsigned int argc, const char **argv)
202 static const unsigned int lang_flags[] = {CL_C, CL_ObjC, CL_CXX, CL_ObjCXX};
203 unsigned int i, result;
205 /* This is conditionalized only because that is the way the front
206 ends used to do it. Maybe this should be unconditional? */
207 if (c_dialect_cxx ())
209 /* By default wrap lines at 80 characters. Is getenv
210 ("COLUMNS") preferable? */
211 diagnostic_line_cutoff (global_dc) = 80;
212 /* By default, emit location information once for every
213 diagnostic message. */
214 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
217 parse_in = cpp_create_reader (c_dialect_cxx () ? CLK_GNUCXX: CLK_GNUC89,
218 ident_hash, &line_table);
220 cpp_opts = cpp_get_options (parse_in);
221 cpp_opts->dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
222 cpp_opts->objc = c_dialect_objc ();
224 /* Reset to avoid warnings on internal definitions. We set it just
225 before passing on command-line options to cpplib. */
226 cpp_opts->warn_dollars = 0;
228 flag_exceptions = c_dialect_cxx ();
229 warn_pointer_arith = c_dialect_cxx ();
231 deferred_opts = XNEWVEC (struct deferred_opt, argc);
233 result = lang_flags[c_language];
235 if (c_language == clk_c)
237 /* If preprocessing assembly language, accept any of the C-family
238 front end options since the driver may pass them through. */
239 for (i = 1; i < argc; i++)
240 if (! strcmp (argv[i], "-lang-asm"))
242 result |= CL_C | CL_ObjC | CL_CXX | CL_ObjCXX;
247 for (i = 1; i < argc; i++)
248 if (! strcmp (argv[i], "-lang-fortran"))
250 result |= CL_Fortran;
259 /* Handle switch SCODE with argument ARG. VALUE is true, unless no-
260 form of an -f or -W option was given. Returns 0 if the switch was
261 invalid, a negative number to prevent language-independent
262 processing in toplev.c (a hack necessary for the short-term). */
264 c_common_handle_option (size_t scode, const char *arg, int value)
266 const struct cl_option *option = &cl_options[scode];
267 enum opt_code code = (enum opt_code) scode;
273 if (cl_options[code].flags & (CL_C | CL_CXX | CL_ObjC | CL_ObjCXX))
276 if (lang_fortran && (cl_options[code].flags & (CL_Fortran)))
282 case OPT__output_pch_:
287 defer_opt (code, arg);
291 cpp_opts->discard_comments = 0;
295 cpp_opts->discard_comments = 0;
296 cpp_opts->discard_comments_in_macro_exp = 0;
300 defer_opt (code, arg);
304 flag_preprocess_only = 1;
308 cpp_opts->print_include_names = 1;
312 TARGET_OPTF (xstrdup (arg));
316 if (strcmp (arg, "-"))
317 add_path (xstrdup (arg), BRACKET, 0, true);
320 if (quote_chain_split)
321 error ("-I- specified twice");
322 quote_chain_split = true;
323 split_quote_chain ();
324 inform ("obsolete option -I- used, please use -iquote instead");
330 /* When doing dependencies with -M or -MM, suppress normal
331 preprocessed output, but still do -dM etc. as software
332 depends on this. Preprocessed output does occur if -MD, -MMD
333 or environment var dependency generation is used. */
334 cpp_opts->deps.style = (code == OPT_M ? DEPS_SYSTEM: DEPS_USER);
336 cpp_opts->inhibit_warnings = 1;
341 cpp_opts->deps.style = (code == OPT_MD ? DEPS_SYSTEM: DEPS_USER);
352 cpp_opts->deps.missing_files = true;
357 cpp_opts->deps.phony_targets = true;
363 defer_opt (code, arg);
367 flag_no_line_commands = 1;
370 case OPT_fworking_directory:
371 flag_working_directory = value;
375 defer_opt (code, arg);
381 set_Wimplicit (value);
382 warn_char_subscripts = value;
383 warn_missing_braces = value;
384 warn_parentheses = value;
385 warn_return_type = value;
386 warn_sequence_point = value; /* Was C only. */
387 if (c_dialect_cxx ())
388 warn_sign_compare = value;
390 warn_strict_aliasing = value;
391 warn_string_literal_comparison = value;
392 warn_always_true = value;
394 /* Only warn about unknown pragmas that are not in system
396 warn_unknown_pragmas = value;
398 /* We save the value of warn_uninitialized, since if they put
399 -Wuninitialized on the command line, we need to generate a
400 warning about not using it without also specifying -O. */
401 if (warn_uninitialized != 1)
402 warn_uninitialized = (value ? 2 : 0);
404 if (!c_dialect_cxx ())
405 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding
406 can turn it off only if it's not explicit. */
407 warn_main = value * 2;
410 /* C++-specific warnings. */
411 warn_reorder = value;
412 warn_nontemplate_friend = value;
415 cpp_opts->warn_trigraphs = value;
416 cpp_opts->warn_comments = value;
417 cpp_opts->warn_num_sign_change = value;
418 cpp_opts->warn_multichar = value; /* Was C++ only. */
420 if (warn_pointer_sign == -1)
421 warn_pointer_sign = 1;
426 cpp_opts->warn_comments = value;
429 case OPT_Wdeprecated:
430 cpp_opts->warn_deprecated = value;
433 case OPT_Wendif_labels:
434 cpp_opts->warn_endif_labels = value;
438 cpp_opts->warnings_are_errors = value;
439 global_dc->warning_as_error_requested = value;
442 case OPT_Werror_implicit_function_declaration:
443 mesg_implicit_function_declaration = 2;
451 set_Wformat (atoi (arg));
455 set_Wimplicit (value);
459 /* Silently ignore for now. */
462 case OPT_Winvalid_pch:
463 cpp_opts->warn_invalid_pch = value;
473 case OPT_Wmissing_include_dirs:
474 cpp_opts->warn_missing_include_dirs = value;
478 cpp_opts->warn_multichar = value;
481 case OPT_Wnormalized_:
482 if (!value || (arg && strcasecmp (arg, "none") == 0))
483 cpp_opts->warn_normalize = normalized_none;
484 else if (!arg || strcasecmp (arg, "nfkc") == 0)
485 cpp_opts->warn_normalize = normalized_KC;
486 else if (strcasecmp (arg, "id") == 0)
487 cpp_opts->warn_normalize = normalized_identifier_C;
488 else if (strcasecmp (arg, "nfc") == 0)
489 cpp_opts->warn_normalize = normalized_C;
491 error ("argument %qs to %<-Wnormalized%> not recognized", arg);
494 case OPT_Wreturn_type:
495 warn_return_type = value;
498 case OPT_Wstrict_null_sentinel:
499 warn_strict_null_sentinel = value;
502 case OPT_Wsystem_headers:
503 cpp_opts->warn_system_headers = value;
506 case OPT_Wtraditional:
507 cpp_opts->warn_traditional = value;
511 cpp_opts->warn_trigraphs = value;
515 cpp_opts->warn_undef = value;
518 case OPT_Wunknown_pragmas:
519 /* Set to greater than 1, so that even unknown pragmas in
520 system headers will be warned about. */
521 warn_unknown_pragmas = value * 2;
524 case OPT_Wunused_macros:
525 warn_unused_macros = value;
528 case OPT_Wvariadic_macros:
529 warn_variadic_macros = value;
532 case OPT_Wwrite_strings:
533 warn_write_strings = value;
539 warn_nonvdtor = true;
543 if (!c_dialect_cxx ())
544 set_std_c89 (false, true);
546 set_std_cxx98 (true);
553 case OPT_fcond_mismatch:
554 if (!c_dialect_cxx ())
556 flag_cond_mismatch = value;
561 case OPT_fall_virtual:
562 case OPT_falt_external_templates:
563 case OPT_fenum_int_equiv:
564 case OPT_fexternal_templates:
565 case OPT_fguiding_decls:
567 case OPT_fhuge_objects:
569 case OPT_fname_mangling_version_:
571 case OPT_fnonnull_objects:
573 case OPT_fstrict_prototype:
574 case OPT_fthis_is_variable:
575 case OPT_fvtable_thunks:
578 warning (0, "switch %qs is no longer supported", option->opt_text);
581 case OPT_faccess_control:
582 flag_access_control = value;
586 flag_no_asm = !value;
590 flag_no_builtin = !value;
597 disable_builtin_function (arg);
600 case OPT_fdollars_in_identifiers:
601 cpp_opts->dollars_in_ident = value;
604 case OPT_ffreestanding:
606 /* Fall through.... */
609 flag_no_builtin = !value;
610 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
611 if (!value && warn_main == 2)
615 case OPT_fshort_double:
616 flag_short_double = value;
619 case OPT_fshort_enums:
620 flag_short_enums = value;
623 case OPT_fshort_wchar:
624 flag_short_wchar = value;
627 case OPT_fsigned_bitfields:
628 flag_signed_bitfields = value;
631 case OPT_fsigned_char:
632 flag_signed_char = value;
635 case OPT_funsigned_bitfields:
636 flag_signed_bitfields = !value;
639 case OPT_funsigned_char:
640 flag_signed_char = !value;
644 flag_check_new = value;
647 case OPT_fconserve_space:
648 flag_conserve_space = value;
651 case OPT_fconstant_string_class_:
652 constant_string_class_name = arg;
655 case OPT_fdefault_inline:
656 flag_default_inline = value;
659 case OPT_felide_constructors:
660 flag_elide_constructors = value;
663 case OPT_fenforce_eh_specs:
664 flag_enforce_eh_specs = value;
667 case OPT_fextended_identifiers:
668 cpp_opts->extended_identifiers = value;
672 flag_new_for_scope = value;
675 case OPT_fgnu_keywords:
676 flag_no_gnu_keywords = !value;
679 case OPT_fgnu_runtime:
680 flag_next_runtime = !value;
683 case OPT_fhandle_exceptions:
684 warning (0, "-fhandle-exceptions has been renamed -fexceptions (and is now on by default)");
685 flag_exceptions = value;
688 case OPT_fimplement_inlines:
689 flag_implement_inlines = value;
692 case OPT_fimplicit_inline_templates:
693 flag_implicit_inline_templates = value;
696 case OPT_fimplicit_templates:
697 flag_implicit_templates = value;
700 case OPT_fms_extensions:
701 flag_ms_extensions = value;
704 case OPT_fnext_runtime:
705 flag_next_runtime = value;
708 case OPT_fnil_receivers:
709 flag_nil_receivers = value;
712 case OPT_fnonansi_builtins:
713 flag_no_nonansi_builtin = !value;
716 case OPT_foperator_names:
717 cpp_opts->operator_names = value;
720 case OPT_foptional_diags:
721 flag_optional_diags = value;
725 cpp_opts->restore_pch_deps = value;
728 case OPT_fpch_preprocess:
729 flag_pch_preprocess = value;
732 case OPT_fpermissive:
733 flag_permissive = value;
736 case OPT_fpreprocessed:
737 cpp_opts->preprocessed = value;
740 case OPT_freplace_objc_classes:
741 flag_replace_objc_classes = value;
745 flag_use_repository = value;
747 flag_implicit_templates = 0;
754 case OPT_fshow_column:
755 cpp_opts->show_column = value;
759 flag_detailed_statistics = value;
763 /* It is documented that we silently ignore silly values. */
764 if (value >= 1 && value <= 100)
765 cpp_opts->tabstop = value;
768 case OPT_fexec_charset_:
769 cpp_opts->narrow_charset = arg;
772 case OPT_fwide_exec_charset_:
773 cpp_opts->wide_charset = arg;
776 case OPT_finput_charset_:
777 cpp_opts->input_charset = arg;
780 case OPT_ftemplate_depth_:
781 max_tinst_depth = value;
784 case OPT_fuse_cxa_atexit:
785 flag_use_cxa_atexit = value;
788 case OPT_fvisibility_inlines_hidden:
789 visibility_options.inlines_hidden = value;
796 case OPT_fthreadsafe_statics:
797 flag_threadsafe_statics = value;
801 flag_zero_link = value;
805 flag_gen_declaration = 1;
809 add_path (xstrdup (arg), AFTER, 0, true);
814 defer_opt (code, arg);
826 add_path (xstrdup (arg), QUOTE, 0, true);
834 add_path (xstrdup (arg), SYSTEM, 0, true);
837 case OPT_iwithprefix:
838 add_prefixed_path (arg, SYSTEM);
841 case OPT_iwithprefixbefore:
842 add_prefixed_path (arg, BRACKET);
846 cpp_set_lang (parse_in, CLK_ASM);
847 cpp_opts->dollars_in_ident = false;
850 case OPT_lang_fortran:
870 error ("output filename specified twice");
873 /* We need to handle the -pedantic switches here, rather than in
874 c_common_post_options, so that a subsequent -Wno-endif-labels
875 is not overridden. */
876 case OPT_pedantic_errors:
877 cpp_opts->pedantic_errors = 1;
880 cpp_opts->pedantic = 1;
881 cpp_opts->warn_endif_labels = 1;
882 if (warn_pointer_sign == -1)
883 warn_pointer_sign = 1;
884 if (warn_overlength_strings == -1)
885 warn_overlength_strings = 1;
888 case OPT_print_objc_runtime_info:
889 print_struct_values = 1;
892 case OPT_print_pch_checksum:
893 c_common_print_pch_checksum (stdout);
894 exit_after_options = true;
902 case OPT_std_gnu__98:
903 set_std_cxx98 (code == OPT_std_c__98 /* ISO */);
907 case OPT_std_iso9899_1990:
908 case OPT_std_iso9899_199409:
909 set_std_c89 (code == OPT_std_iso9899_199409 /* c94 */, true /* ISO */);
913 set_std_c89 (false /* c94 */, false /* ISO */);
918 case OPT_std_iso9899_1999:
919 case OPT_std_iso9899_199x:
920 set_std_c99 (true /* ISO */);
925 set_std_c99 (false /* ISO */);
929 cpp_opts->trigraphs = 1;
932 case OPT_traditional_cpp:
933 cpp_opts->traditional = 1;
941 cpp_opts->inhibit_warnings = 1;
952 /* Post-switch processing. */
954 c_common_post_options (const char **pfilename)
956 struct cpp_callbacks *cb;
958 /* Canonicalize the input and output filenames. */
959 if (in_fnames == NULL)
961 in_fnames = XNEWVEC (const char *, 1);
964 else if (strcmp (in_fnames[0], "-") == 0)
967 if (out_fname == NULL || !strcmp (out_fname, "-"))
970 if (cpp_opts->deps.style == DEPS_NONE)
971 check_deps_environment_vars ();
973 handle_deferred_opts ();
975 sanitize_cpp_opts ();
977 register_include_chains (parse_in, sysroot, iprefix, imultilib,
978 std_inc, std_cxx_inc && c_dialect_cxx (), verbose);
980 flag_inline_trees = 1;
982 /* Use tree inlining. */
985 if (flag_inline_functions)
986 flag_inline_trees = 2;
988 /* If we are given more than one input file, we must use
989 unit-at-a-time mode. */
990 if (num_in_fnames > 1)
991 flag_unit_at_a_time = 1;
993 /* Default to ObjC sjlj exception handling if NeXT runtime. */
994 if (flag_objc_sjlj_exceptions < 0)
995 flag_objc_sjlj_exceptions = flag_next_runtime;
996 if (flag_objc_exceptions && !flag_objc_sjlj_exceptions)
999 /* -Wextra implies -Wsign-compare and -Wmissing-field-initializers,
1000 but not if explicitly overridden. */
1001 if (warn_sign_compare == -1)
1002 warn_sign_compare = extra_warnings;
1003 if (warn_missing_field_initializers == -1)
1004 warn_missing_field_initializers = extra_warnings;
1006 /* -Wpointer_sign is disabled by default, but it is enabled if any
1007 of -Wall or -pedantic are given. */
1008 if (warn_pointer_sign == -1)
1009 warn_pointer_sign = 0;
1011 /* -Woverlength-strings is off by default, but is enabled by -pedantic.
1012 It is never enabled in C++, as the minimum limit is not normative
1013 in that standard. */
1014 if (warn_overlength_strings == -1 || c_dialect_cxx ())
1015 warn_overlength_strings = 0;
1017 /* Special format checking options don't work without -Wformat; warn if
1021 warning (OPT_Wformat_y2k,
1022 "-Wformat-y2k ignored without -Wformat");
1023 warning (OPT_Wformat_extra_args,
1024 "-Wformat-extra-args ignored without -Wformat");
1025 warning (OPT_Wformat_zero_length,
1026 "-Wformat-zero-length ignored without -Wformat");
1027 warning (OPT_Wformat_nonliteral,
1028 "-Wformat-nonliteral ignored without -Wformat");
1029 warning (OPT_Wformat_security,
1030 "-Wformat-security ignored without -Wformat");
1033 /* C99 requires special handling of complex multiplication and division;
1034 -ffast-math and -fcx-limited-range are handled in process_options. */
1036 flag_complex_method = 2;
1038 if (flag_preprocess_only)
1040 /* Open the output now. We must do so even if flag_no_output is
1041 on, because there may be other output than from the actual
1042 preprocessing (e.g. from -dM). */
1043 if (out_fname[0] == '\0')
1044 out_stream = stdout;
1046 out_stream = fopen (out_fname, "w");
1048 if (out_stream == NULL)
1050 fatal_error ("opening output file %s: %m", out_fname);
1054 if (num_in_fnames > 1)
1055 error ("too many filenames given. Type %s --help for usage",
1058 init_pp_output (out_stream);
1064 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1065 input_location = UNKNOWN_LOCATION;
1068 cb = cpp_get_callbacks (parse_in);
1069 cb->file_change = cb_file_change;
1070 cb->dir_change = cb_dir_change;
1071 cpp_post_options (parse_in);
1073 input_location = UNKNOWN_LOCATION;
1075 /* If an error has occurred in cpplib, note it so we fail
1077 errorcount += cpp_errors (parse_in);
1079 *pfilename = this_input_filename
1080 = cpp_read_main_file (parse_in, in_fnames[0]);
1081 /* Don't do any compilation or preprocessing if there is no input file. */
1082 if (this_input_filename == NULL)
1088 if (flag_working_directory
1089 && flag_preprocess_only && !flag_no_line_commands)
1090 pp_dir_change (parse_in, get_src_pwd ());
1092 return flag_preprocess_only;
1095 /* Front end initialization common to C, ObjC and C++. */
1097 c_common_init (void)
1099 /* Set up preprocessor arithmetic. Must be done after call to
1100 c_common_nodes_and_builtins for type nodes to be good. */
1101 cpp_opts->precision = TYPE_PRECISION (intmax_type_node);
1102 cpp_opts->char_precision = TYPE_PRECISION (char_type_node);
1103 cpp_opts->int_precision = TYPE_PRECISION (integer_type_node);
1104 cpp_opts->wchar_precision = TYPE_PRECISION (wchar_type_node);
1105 cpp_opts->unsigned_wchar = TYPE_UNSIGNED (wchar_type_node);
1106 cpp_opts->bytes_big_endian = BYTES_BIG_ENDIAN;
1108 /* This can't happen until after wchar_precision and bytes_big_endian
1110 cpp_init_iconv (parse_in);
1113 c_common_print_pch_checksum (stderr);
1115 if (flag_preprocess_only)
1118 preprocess_file (parse_in);
1122 /* Has to wait until now so that cpplib has its hash table. */
1128 /* Initialize the integrated preprocessor after debug output has been
1129 initialized; loop over each input file. */
1131 c_common_parse_file (int set_yydebug)
1135 /* Enable parser debugging, if requested and we can. If requested
1136 and we can't, notify the user. */
1138 yydebug = set_yydebug;
1141 warning (0, "YYDEBUG was not defined at build time, -dy ignored");
1147 /* Start the main input file, if the debug writer wants it. */
1148 if (debug_hooks->start_end_main_source_file)
1149 (*debug_hooks->start_source_file) (0, this_input_filename);
1156 /* And end the main input file, if the debug writer wants it */
1157 if (debug_hooks->start_end_main_source_file)
1158 (*debug_hooks->end_source_file) (0);
1159 if (++i >= num_in_fnames)
1161 cpp_undef_all (parse_in);
1163 = cpp_read_main_file (parse_in, in_fnames[i]);
1164 /* If an input file is missing, abandon further compilation.
1165 cpplib has issued a diagnostic. */
1166 if (!this_input_filename)
1171 /* Common finish hook for the C, ObjC and C++ front ends. */
1173 c_common_finish (void)
1175 FILE *deps_stream = NULL;
1177 if (cpp_opts->deps.style != DEPS_NONE)
1179 /* If -M or -MM was seen without -MF, default output to the
1182 deps_stream = out_stream;
1185 deps_stream = fopen (deps_file, deps_append ? "a": "w");
1187 fatal_error ("opening dependency file %s: %m", deps_file);
1191 /* For performance, avoid tearing down cpplib's internal structures
1192 with cpp_destroy (). */
1193 errorcount += cpp_finish (parse_in, deps_stream);
1195 if (deps_stream && deps_stream != out_stream
1196 && (ferror (deps_stream) || fclose (deps_stream)))
1197 fatal_error ("closing dependency file %s: %m", deps_file);
1199 if (out_stream && (ferror (out_stream) || fclose (out_stream)))
1200 fatal_error ("when writing output to %s: %m", out_fname);
1203 /* Either of two environment variables can specify output of
1204 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1205 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1206 and DEPS_TARGET is the target to mention in the deps. They also
1207 result in dependency information being appended to the output file
1208 rather than overwriting it, and like Sun's compiler
1209 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1211 check_deps_environment_vars (void)
1215 GET_ENVIRONMENT (spec, "DEPENDENCIES_OUTPUT");
1217 cpp_opts->deps.style = DEPS_USER;
1220 GET_ENVIRONMENT (spec, "SUNPRO_DEPENDENCIES");
1223 cpp_opts->deps.style = DEPS_SYSTEM;
1224 cpp_opts->deps.ignore_main_file = true;
1230 /* Find the space before the DEPS_TARGET, if there is one. */
1231 char *s = strchr (spec, ' ');
1234 /* Let the caller perform MAKE quoting. */
1235 defer_opt (OPT_MT, s + 1);
1239 /* Command line -MF overrides environment variables and default. */
1248 /* Handle deferred command line switches. */
1250 handle_deferred_opts (void)
1255 /* Avoid allocating the deps buffer if we don't need it.
1256 (This flag may be true without there having been -MT or -MQ
1257 options, but we'll still need the deps buffer.) */
1261 deps = cpp_get_deps (parse_in);
1263 for (i = 0; i < deferred_count; i++)
1265 struct deferred_opt *opt = &deferred_opts[i];
1267 if (opt->code == OPT_MT || opt->code == OPT_MQ)
1268 deps_add_target (deps, opt->arg, opt->code == OPT_MQ);
1272 /* These settings are appropriate for GCC, but not necessarily so for
1273 cpplib as a library. */
1275 sanitize_cpp_opts (void)
1277 /* If we don't know what style of dependencies to output, complain
1278 if any other dependency switches have been given. */
1279 if (deps_seen && cpp_opts->deps.style == DEPS_NONE)
1280 error ("to generate dependencies you must specify either -M or -MM");
1282 /* -dM and dependencies suppress normal output; do it here so that
1283 the last -d[MDN] switch overrides earlier ones. */
1284 if (flag_dump_macros == 'M')
1287 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1288 -dM since at least glibc relies on -M -dM to work. */
1289 /* Also, flag_no_output implies flag_no_line_commands, always. */
1292 if (flag_dump_macros != 'M')
1293 flag_dump_macros = 0;
1294 flag_dump_includes = 0;
1295 flag_no_line_commands = 1;
1298 cpp_opts->unsigned_char = !flag_signed_char;
1299 cpp_opts->stdc_0_in_system_headers = STDC_0_IN_SYSTEM_HEADERS;
1301 /* We want -Wno-long-long to override -pedantic -std=non-c99
1302 and/or -Wtraditional, whatever the ordering. */
1303 cpp_opts->warn_long_long
1304 = warn_long_long && ((!flag_isoc99 && pedantic) || warn_traditional);
1306 /* Similarly with -Wno-variadic-macros. No check for c99 here, since
1307 this also turns off warnings about GCCs extension. */
1308 cpp_opts->warn_variadic_macros
1309 = warn_variadic_macros && (pedantic || warn_traditional);
1311 /* If we're generating preprocessor output, emit current directory
1312 if explicitly requested or if debugging information is enabled.
1313 ??? Maybe we should only do it for debugging formats that
1314 actually output the current directory? */
1315 if (flag_working_directory == -1)
1316 flag_working_directory = (debug_info_level != DINFO_LEVEL_NONE);
1319 /* Add include path with a prefix at the front of its name. */
1321 add_prefixed_path (const char *suffix, size_t chain)
1325 size_t prefix_len, suffix_len;
1327 suffix_len = strlen (suffix);
1328 prefix = iprefix ? iprefix : cpp_GCC_INCLUDE_DIR;
1329 prefix_len = iprefix ? strlen (iprefix) : cpp_GCC_INCLUDE_DIR_len;
1331 path = (char *) xmalloc (prefix_len + suffix_len + 1);
1332 memcpy (path, prefix, prefix_len);
1333 memcpy (path + prefix_len, suffix, suffix_len);
1334 path[prefix_len + suffix_len] = '\0';
1336 add_path (path, chain, 0, false);
1339 /* Handle -D, -U, -A, -imacros, and the first -include. */
1341 finish_options (void)
1343 if (!cpp_opts->preprocessed)
1347 cb_file_change (parse_in,
1348 linemap_add (&line_table, LC_RENAME, 0,
1349 _("<built-in>"), 0));
1351 cpp_init_builtins (parse_in, flag_hosted);
1352 c_cpp_builtins (parse_in);
1354 /* We're about to send user input to cpplib, so make it warn for
1355 things that we previously (when we sent it internal definitions)
1356 told it to not warn.
1358 C99 permits implementation-defined characters in identifiers.
1359 The documented meaning of -std= is to turn off extensions that
1360 conflict with the specified standard, and since a strictly
1361 conforming program cannot contain a '$', we do not condition
1362 their acceptance on the -std= setting. */
1363 cpp_opts->warn_dollars = (cpp_opts->pedantic && !cpp_opts->c99);
1365 cpp_change_file (parse_in, LC_RENAME, _("<command line>"));
1366 for (i = 0; i < deferred_count; i++)
1368 struct deferred_opt *opt = &deferred_opts[i];
1370 if (opt->code == OPT_D)
1371 cpp_define (parse_in, opt->arg);
1372 else if (opt->code == OPT_U)
1373 cpp_undef (parse_in, opt->arg);
1374 else if (opt->code == OPT_A)
1376 if (opt->arg[0] == '-')
1377 cpp_unassert (parse_in, opt->arg + 1);
1379 cpp_assert (parse_in, opt->arg);
1383 /* Handle -imacros after -D and -U. */
1384 for (i = 0; i < deferred_count; i++)
1386 struct deferred_opt *opt = &deferred_opts[i];
1388 if (opt->code == OPT_imacros
1389 && cpp_push_include (parse_in, opt->arg))
1391 /* Disable push_command_line_include callback for now. */
1392 include_cursor = deferred_count + 1;
1393 cpp_scan_nooutput (parse_in);
1399 push_command_line_include ();
1402 /* Give CPP the next file given by -include, if any. */
1404 push_command_line_include (void)
1406 while (include_cursor < deferred_count)
1408 struct deferred_opt *opt = &deferred_opts[include_cursor++];
1410 if (!cpp_opts->preprocessed && opt->code == OPT_include
1411 && cpp_push_include (parse_in, opt->arg))
1415 if (include_cursor == deferred_count)
1418 /* -Wunused-macros should only warn about macros defined hereafter. */
1419 cpp_opts->warn_unused_macros = warn_unused_macros;
1420 /* Restore the line map from <command line>. */
1421 if (!cpp_opts->preprocessed)
1422 cpp_change_file (parse_in, LC_RENAME, this_input_filename);
1424 /* Set this here so the client can change the option if it wishes,
1425 and after stacking the main file so we don't trace the main file. */
1426 line_table.trace_includes = cpp_opts->print_include_names;
1430 /* File change callback. Has to handle -include files. */
1432 cb_file_change (cpp_reader * ARG_UNUSED (pfile),
1433 const struct line_map *new_map)
1435 if (flag_preprocess_only)
1436 pp_file_change (new_map);
1438 fe_file_change (new_map);
1440 if (new_map == 0 || (new_map->reason == LC_LEAVE && MAIN_FILE_P (new_map)))
1441 push_command_line_include ();
1445 cb_dir_change (cpp_reader * ARG_UNUSED (pfile), const char *dir)
1447 if (!set_src_pwd (dir))
1448 warning (0, "too late for # directive to set debug directory");
1451 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1452 extensions if ISO). There is no concept of gnu94. */
1454 set_std_c89 (int c94, int iso)
1456 cpp_set_lang (parse_in, c94 ? CLK_STDC94: iso ? CLK_STDC89: CLK_GNUC89);
1459 flag_no_gnu_keywords = iso;
1460 flag_no_nonansi_builtin = iso;
1465 /* Set the C 99 standard (without GNU extensions if ISO). */
1467 set_std_c99 (int iso)
1469 cpp_set_lang (parse_in, iso ? CLK_STDC99: CLK_GNUC99);
1471 flag_no_nonansi_builtin = iso;
1477 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1479 set_std_cxx98 (int iso)
1481 cpp_set_lang (parse_in, iso ? CLK_CXX98: CLK_GNUCXX);
1482 flag_no_gnu_keywords = iso;
1483 flag_no_nonansi_builtin = iso;
1487 /* Handle setting implicit to ON. */
1489 set_Wimplicit (int on)
1492 warn_implicit_int = on;
1495 if (mesg_implicit_function_declaration != 2)
1496 mesg_implicit_function_declaration = 1;
1499 mesg_implicit_function_declaration = 0;
1502 /* Args to -d specify what to dump. Silently ignore
1503 unrecognized options; they may be aimed at toplev.c. */
1505 handle_OPT_d (const char *arg)
1509 while ((c = *arg++) != '\0')
1512 case 'M': /* Dump macros only. */
1513 case 'N': /* Dump names. */
1514 case 'D': /* Dump definitions. */
1515 flag_dump_macros = c;
1519 flag_dump_includes = 1;