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_const_strings = c_dialect_cxx ();
229 flag_exceptions = c_dialect_cxx ();
230 warn_pointer_arith = c_dialect_cxx ();
232 deferred_opts = XNEWVEC (struct deferred_opt, argc);
234 result = lang_flags[c_language];
236 if (c_language == clk_c)
238 /* If preprocessing assembly language, accept any of the C-family
239 front end options since the driver may pass them through. */
240 for (i = 1; i < argc; i++)
241 if (! strcmp (argv[i], "-lang-asm"))
243 result |= CL_C | CL_ObjC | CL_CXX | CL_ObjCXX;
248 for (i = 1; i < argc; i++)
249 if (! strcmp (argv[i], "-lang-fortran"))
251 result |= CL_Fortran;
260 /* Handle switch SCODE with argument ARG. VALUE is true, unless no-
261 form of an -f or -W option was given. Returns 0 if the switch was
262 invalid, a negative number to prevent language-independent
263 processing in toplev.c (a hack necessary for the short-term). */
265 c_common_handle_option (size_t scode, const char *arg, int value)
267 const struct cl_option *option = &cl_options[scode];
268 enum opt_code code = (enum opt_code) scode;
274 if (cl_options[code].flags & (CL_C | CL_CXX | CL_ObjC | CL_ObjCXX))
277 if (lang_fortran && (cl_options[code].flags & (CL_Fortran)))
283 case OPT__output_pch_:
288 defer_opt (code, arg);
292 cpp_opts->discard_comments = 0;
296 cpp_opts->discard_comments = 0;
297 cpp_opts->discard_comments_in_macro_exp = 0;
301 defer_opt (code, arg);
305 flag_preprocess_only = 1;
309 cpp_opts->print_include_names = 1;
313 TARGET_OPTF (xstrdup (arg));
317 if (strcmp (arg, "-"))
318 add_path (xstrdup (arg), BRACKET, 0, true);
321 if (quote_chain_split)
322 error ("-I- specified twice");
323 quote_chain_split = true;
324 split_quote_chain ();
325 inform ("obsolete option -I- used, please use -iquote instead");
331 /* When doing dependencies with -M or -MM, suppress normal
332 preprocessed output, but still do -dM etc. as software
333 depends on this. Preprocessed output does occur if -MD, -MMD
334 or environment var dependency generation is used. */
335 cpp_opts->deps.style = (code == OPT_M ? DEPS_SYSTEM: DEPS_USER);
337 cpp_opts->inhibit_warnings = 1;
342 cpp_opts->deps.style = (code == OPT_MD ? DEPS_SYSTEM: DEPS_USER);
353 cpp_opts->deps.missing_files = true;
358 cpp_opts->deps.phony_targets = true;
364 defer_opt (code, arg);
368 flag_no_line_commands = 1;
371 case OPT_fworking_directory:
372 flag_working_directory = value;
376 defer_opt (code, arg);
382 set_Wimplicit (value);
383 warn_char_subscripts = value;
384 warn_missing_braces = value;
385 warn_parentheses = value;
386 warn_return_type = value;
387 warn_sequence_point = value; /* Was C only. */
388 if (c_dialect_cxx ())
389 warn_sign_compare = value;
391 warn_strict_aliasing = value;
392 warn_string_literal_comparison = value;
393 warn_always_true = value;
395 /* Only warn about unknown pragmas that are not in system
397 warn_unknown_pragmas = value;
399 /* We save the value of warn_uninitialized, since if they put
400 -Wuninitialized on the command line, we need to generate a
401 warning about not using it without also specifying -O. */
402 if (warn_uninitialized != 1)
403 warn_uninitialized = (value ? 2 : 0);
405 if (!c_dialect_cxx ())
406 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding
407 can turn it off only if it's not explicit. */
408 warn_main = value * 2;
411 /* C++-specific warnings. */
412 warn_reorder = value;
413 warn_nontemplate_friend = value;
416 cpp_opts->warn_trigraphs = value;
417 cpp_opts->warn_comments = value;
418 cpp_opts->warn_num_sign_change = value;
419 cpp_opts->warn_multichar = value; /* Was C++ only. */
424 cpp_opts->warn_comments = value;
427 case OPT_Wdeprecated:
428 cpp_opts->warn_deprecated = value;
431 case OPT_Wdiv_by_zero:
432 warn_div_by_zero = value;
435 case OPT_Wendif_labels:
436 cpp_opts->warn_endif_labels = value;
440 cpp_opts->warnings_are_errors = value;
441 global_dc->warning_as_error_requested = value;
444 case OPT_Werror_implicit_function_declaration:
445 mesg_implicit_function_declaration = 2;
453 set_Wformat (atoi (arg));
457 set_Wimplicit (value);
461 /* Silently ignore for now. */
464 case OPT_Winvalid_pch:
465 cpp_opts->warn_invalid_pch = value;
475 case OPT_Wmissing_include_dirs:
476 cpp_opts->warn_missing_include_dirs = value;
480 cpp_opts->warn_multichar = value;
483 case OPT_Wnormalized_:
484 if (!value || (arg && strcasecmp (arg, "none") == 0))
485 cpp_opts->warn_normalize = normalized_none;
486 else if (!arg || strcasecmp (arg, "nfkc") == 0)
487 cpp_opts->warn_normalize = normalized_KC;
488 else if (strcasecmp (arg, "id") == 0)
489 cpp_opts->warn_normalize = normalized_identifier_C;
490 else if (strcasecmp (arg, "nfc") == 0)
491 cpp_opts->warn_normalize = normalized_C;
493 error ("argument %qs to %<-Wnormalized%> not recognized", arg);
496 case OPT_Wreturn_type:
497 warn_return_type = value;
500 case OPT_Wstrict_null_sentinel:
501 warn_strict_null_sentinel = value;
504 case OPT_Wsystem_headers:
505 cpp_opts->warn_system_headers = value;
508 case OPT_Wtraditional:
509 cpp_opts->warn_traditional = value;
513 cpp_opts->warn_trigraphs = value;
517 cpp_opts->warn_undef = value;
520 case OPT_Wunknown_pragmas:
521 /* Set to greater than 1, so that even unknown pragmas in
522 system headers will be warned about. */
523 warn_unknown_pragmas = value * 2;
526 case OPT_Wunused_macros:
527 warn_unused_macros = value;
530 case OPT_Wvariadic_macros:
531 warn_variadic_macros = value;
534 case OPT_Wwrite_strings:
535 if (!c_dialect_cxx ())
536 flag_const_strings = value;
538 warn_write_strings = value;
544 warn_nonvdtor = true;
548 if (!c_dialect_cxx ())
549 set_std_c89 (false, true);
551 set_std_cxx98 (true);
558 case OPT_fcond_mismatch:
559 if (!c_dialect_cxx ())
561 flag_cond_mismatch = value;
566 case OPT_fall_virtual:
567 case OPT_falt_external_templates:
568 case OPT_fenum_int_equiv:
569 case OPT_fexternal_templates:
570 case OPT_fguiding_decls:
572 case OPT_fhuge_objects:
574 case OPT_fname_mangling_version_:
576 case OPT_fnonnull_objects:
578 case OPT_fstrict_prototype:
579 case OPT_fthis_is_variable:
580 case OPT_fvtable_thunks:
583 warning (0, "switch %qs is no longer supported", option->opt_text);
586 case OPT_faccess_control:
587 flag_access_control = value;
591 flag_no_asm = !value;
595 flag_no_builtin = !value;
602 disable_builtin_function (arg);
605 case OPT_fdollars_in_identifiers:
606 cpp_opts->dollars_in_ident = value;
609 case OPT_ffreestanding:
611 /* Fall through.... */
614 flag_no_builtin = !value;
615 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
616 if (!value && warn_main == 2)
620 case OPT_fshort_double:
621 flag_short_double = value;
624 case OPT_fshort_enums:
625 flag_short_enums = value;
628 case OPT_fshort_wchar:
629 flag_short_wchar = value;
632 case OPT_fsigned_bitfields:
633 flag_signed_bitfields = value;
636 case OPT_fsigned_char:
637 flag_signed_char = value;
640 case OPT_funsigned_bitfields:
641 flag_signed_bitfields = !value;
644 case OPT_funsigned_char:
645 flag_signed_char = !value;
649 flag_check_new = value;
652 case OPT_fconserve_space:
653 flag_conserve_space = value;
656 case OPT_fconst_strings:
657 flag_const_strings = value;
660 case OPT_fconstant_string_class_:
661 constant_string_class_name = arg;
664 case OPT_fdefault_inline:
665 flag_default_inline = value;
668 case OPT_felide_constructors:
669 flag_elide_constructors = value;
672 case OPT_fenforce_eh_specs:
673 flag_enforce_eh_specs = value;
676 case OPT_fextended_identifiers:
677 cpp_opts->extended_identifiers = value;
681 flag_new_for_scope = value;
684 case OPT_fgnu_keywords:
685 flag_no_gnu_keywords = !value;
688 case OPT_fgnu_runtime:
689 flag_next_runtime = !value;
692 case OPT_fhandle_exceptions:
693 warning (0, "-fhandle-exceptions has been renamed -fexceptions (and is now on by default)");
694 flag_exceptions = value;
697 case OPT_fimplement_inlines:
698 flag_implement_inlines = value;
701 case OPT_fimplicit_inline_templates:
702 flag_implicit_inline_templates = value;
705 case OPT_fimplicit_templates:
706 flag_implicit_templates = value;
709 case OPT_fms_extensions:
710 flag_ms_extensions = value;
713 case OPT_fnext_runtime:
714 flag_next_runtime = value;
717 case OPT_fnil_receivers:
718 flag_nil_receivers = value;
721 case OPT_fnonansi_builtins:
722 flag_no_nonansi_builtin = !value;
725 case OPT_foperator_names:
726 cpp_opts->operator_names = value;
729 case OPT_foptional_diags:
730 flag_optional_diags = value;
734 cpp_opts->restore_pch_deps = value;
737 case OPT_fpch_preprocess:
738 flag_pch_preprocess = value;
741 case OPT_fpermissive:
742 flag_permissive = value;
745 case OPT_fpreprocessed:
746 cpp_opts->preprocessed = value;
749 case OPT_freplace_objc_classes:
750 flag_replace_objc_classes = value;
754 flag_use_repository = value;
756 flag_implicit_templates = 0;
763 case OPT_fshow_column:
764 cpp_opts->show_column = value;
768 flag_detailed_statistics = value;
772 /* It is documented that we silently ignore silly values. */
773 if (value >= 1 && value <= 100)
774 cpp_opts->tabstop = value;
777 case OPT_fexec_charset_:
778 cpp_opts->narrow_charset = arg;
781 case OPT_fwide_exec_charset_:
782 cpp_opts->wide_charset = arg;
785 case OPT_finput_charset_:
786 cpp_opts->input_charset = arg;
789 case OPT_ftemplate_depth_:
790 max_tinst_depth = value;
793 case OPT_fuse_cxa_atexit:
794 flag_use_cxa_atexit = value;
797 case OPT_fvisibility_inlines_hidden:
798 visibility_options.inlines_hidden = value;
805 case OPT_fthreadsafe_statics:
806 flag_threadsafe_statics = value;
810 flag_zero_link = value;
814 flag_gen_declaration = 1;
818 add_path (xstrdup (arg), AFTER, 0, true);
823 defer_opt (code, arg);
835 add_path (xstrdup (arg), QUOTE, 0, true);
843 add_path (xstrdup (arg), SYSTEM, 0, true);
846 case OPT_iwithprefix:
847 add_prefixed_path (arg, SYSTEM);
850 case OPT_iwithprefixbefore:
851 add_prefixed_path (arg, BRACKET);
855 cpp_set_lang (parse_in, CLK_ASM);
856 cpp_opts->dollars_in_ident = false;
859 case OPT_lang_fortran:
879 error ("output filename specified twice");
882 /* We need to handle the -pedantic switches here, rather than in
883 c_common_post_options, so that a subsequent -Wno-endif-labels
884 is not overridden. */
885 case OPT_pedantic_errors:
886 cpp_opts->pedantic_errors = 1;
889 cpp_opts->pedantic = 1;
890 cpp_opts->warn_endif_labels = 1;
893 case OPT_print_objc_runtime_info:
894 print_struct_values = 1;
897 case OPT_print_pch_checksum:
898 c_common_print_pch_checksum (stdout);
899 exit_after_options = true;
907 case OPT_std_gnu__98:
908 set_std_cxx98 (code == OPT_std_c__98 /* ISO */);
912 case OPT_std_iso9899_1990:
913 case OPT_std_iso9899_199409:
914 set_std_c89 (code == OPT_std_iso9899_199409 /* c94 */, true /* ISO */);
918 set_std_c89 (false /* c94 */, false /* ISO */);
923 case OPT_std_iso9899_1999:
924 case OPT_std_iso9899_199x:
925 set_std_c99 (true /* ISO */);
930 set_std_c99 (false /* ISO */);
934 cpp_opts->trigraphs = 1;
937 case OPT_traditional_cpp:
938 cpp_opts->traditional = 1;
946 cpp_opts->inhibit_warnings = 1;
957 /* Post-switch processing. */
959 c_common_post_options (const char **pfilename)
961 struct cpp_callbacks *cb;
963 /* Canonicalize the input and output filenames. */
964 if (in_fnames == NULL)
966 in_fnames = XNEWVEC (const char *, 1);
969 else if (strcmp (in_fnames[0], "-") == 0)
972 if (out_fname == NULL || !strcmp (out_fname, "-"))
975 if (cpp_opts->deps.style == DEPS_NONE)
976 check_deps_environment_vars ();
978 handle_deferred_opts ();
980 sanitize_cpp_opts ();
982 register_include_chains (parse_in, sysroot, iprefix, imultilib,
983 std_inc, std_cxx_inc && c_dialect_cxx (), verbose);
985 flag_inline_trees = 1;
987 /* Use tree inlining. */
990 if (flag_inline_functions)
991 flag_inline_trees = 2;
993 /* If we are given more than one input file, we must use
994 unit-at-a-time mode. */
995 if (num_in_fnames > 1)
996 flag_unit_at_a_time = 1;
998 /* Default to ObjC sjlj exception handling if NeXT runtime. */
999 if (flag_objc_sjlj_exceptions < 0)
1000 flag_objc_sjlj_exceptions = flag_next_runtime;
1001 if (flag_objc_exceptions && !flag_objc_sjlj_exceptions)
1002 flag_exceptions = 1;
1004 /* -Wextra implies -Wsign-compare and -Wmissing-field-initializers,
1005 but not if explicitly overridden. */
1006 if (warn_sign_compare == -1)
1007 warn_sign_compare = extra_warnings;
1008 if (warn_missing_field_initializers == -1)
1009 warn_missing_field_initializers = extra_warnings;
1011 /* Special format checking options don't work without -Wformat; warn if
1015 warning (OPT_Wformat_y2k,
1016 "-Wformat-y2k ignored without -Wformat");
1017 warning (OPT_Wformat_extra_args,
1018 "-Wformat-extra-args ignored without -Wformat");
1019 warning (OPT_Wformat_zero_length,
1020 "-Wformat-zero-length ignored without -Wformat");
1021 warning (OPT_Wformat_nonliteral,
1022 "-Wformat-nonliteral ignored without -Wformat");
1023 warning (OPT_Wformat_security,
1024 "-Wformat-security ignored without -Wformat");
1027 /* C99 requires special handling of complex multiplication and division;
1028 -ffast-math and -fcx-limited-range are handled in process_options. */
1030 flag_complex_method = 2;
1032 if (flag_preprocess_only)
1034 /* Open the output now. We must do so even if flag_no_output is
1035 on, because there may be other output than from the actual
1036 preprocessing (e.g. from -dM). */
1037 if (out_fname[0] == '\0')
1038 out_stream = stdout;
1040 out_stream = fopen (out_fname, "w");
1042 if (out_stream == NULL)
1044 fatal_error ("opening output file %s: %m", out_fname);
1048 if (num_in_fnames > 1)
1049 error ("too many filenames given. Type %s --help for usage",
1052 init_pp_output (out_stream);
1058 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1059 input_location = UNKNOWN_LOCATION;
1062 cb = cpp_get_callbacks (parse_in);
1063 cb->file_change = cb_file_change;
1064 cb->dir_change = cb_dir_change;
1065 cpp_post_options (parse_in);
1067 input_location = UNKNOWN_LOCATION;
1069 /* If an error has occurred in cpplib, note it so we fail
1071 errorcount += cpp_errors (parse_in);
1073 *pfilename = this_input_filename
1074 = cpp_read_main_file (parse_in, in_fnames[0]);
1075 /* Don't do any compilation or preprocessing if there is no input file. */
1076 if (this_input_filename == NULL)
1082 if (flag_working_directory
1083 && flag_preprocess_only && !flag_no_line_commands)
1084 pp_dir_change (parse_in, get_src_pwd ());
1086 return flag_preprocess_only;
1089 /* Front end initialization common to C, ObjC and C++. */
1091 c_common_init (void)
1093 /* Set up preprocessor arithmetic. Must be done after call to
1094 c_common_nodes_and_builtins for type nodes to be good. */
1095 cpp_opts->precision = TYPE_PRECISION (intmax_type_node);
1096 cpp_opts->char_precision = TYPE_PRECISION (char_type_node);
1097 cpp_opts->int_precision = TYPE_PRECISION (integer_type_node);
1098 cpp_opts->wchar_precision = TYPE_PRECISION (wchar_type_node);
1099 cpp_opts->unsigned_wchar = TYPE_UNSIGNED (wchar_type_node);
1100 cpp_opts->bytes_big_endian = BYTES_BIG_ENDIAN;
1102 /* This can't happen until after wchar_precision and bytes_big_endian
1104 cpp_init_iconv (parse_in);
1107 c_common_print_pch_checksum (stderr);
1109 if (flag_preprocess_only)
1112 preprocess_file (parse_in);
1116 /* Has to wait until now so that cpplib has its hash table. */
1122 /* Initialize the integrated preprocessor after debug output has been
1123 initialized; loop over each input file. */
1125 c_common_parse_file (int set_yydebug)
1129 /* Enable parser debugging, if requested and we can. If requested
1130 and we can't, notify the user. */
1132 yydebug = set_yydebug;
1135 warning (0, "YYDEBUG was not defined at build time, -dy ignored");
1141 /* Start the main input file, if the debug writer wants it. */
1142 if (debug_hooks->start_end_main_source_file)
1143 (*debug_hooks->start_source_file) (0, this_input_filename);
1150 /* And end the main input file, if the debug writer wants it */
1151 if (debug_hooks->start_end_main_source_file)
1152 (*debug_hooks->end_source_file) (0);
1153 if (++i >= num_in_fnames)
1155 cpp_undef_all (parse_in);
1157 = cpp_read_main_file (parse_in, in_fnames[i]);
1158 /* If an input file is missing, abandon further compilation.
1159 cpplib has issued a diagnostic. */
1160 if (!this_input_filename)
1165 /* Common finish hook for the C, ObjC and C++ front ends. */
1167 c_common_finish (void)
1169 FILE *deps_stream = NULL;
1171 if (cpp_opts->deps.style != DEPS_NONE)
1173 /* If -M or -MM was seen without -MF, default output to the
1176 deps_stream = out_stream;
1179 deps_stream = fopen (deps_file, deps_append ? "a": "w");
1181 fatal_error ("opening dependency file %s: %m", deps_file);
1185 /* For performance, avoid tearing down cpplib's internal structures
1186 with cpp_destroy (). */
1187 errorcount += cpp_finish (parse_in, deps_stream);
1189 if (deps_stream && deps_stream != out_stream
1190 && (ferror (deps_stream) || fclose (deps_stream)))
1191 fatal_error ("closing dependency file %s: %m", deps_file);
1193 if (out_stream && (ferror (out_stream) || fclose (out_stream)))
1194 fatal_error ("when writing output to %s: %m", out_fname);
1197 /* Either of two environment variables can specify output of
1198 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1199 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1200 and DEPS_TARGET is the target to mention in the deps. They also
1201 result in dependency information being appended to the output file
1202 rather than overwriting it, and like Sun's compiler
1203 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1205 check_deps_environment_vars (void)
1209 GET_ENVIRONMENT (spec, "DEPENDENCIES_OUTPUT");
1211 cpp_opts->deps.style = DEPS_USER;
1214 GET_ENVIRONMENT (spec, "SUNPRO_DEPENDENCIES");
1217 cpp_opts->deps.style = DEPS_SYSTEM;
1218 cpp_opts->deps.ignore_main_file = true;
1224 /* Find the space before the DEPS_TARGET, if there is one. */
1225 char *s = strchr (spec, ' ');
1228 /* Let the caller perform MAKE quoting. */
1229 defer_opt (OPT_MT, s + 1);
1233 /* Command line -MF overrides environment variables and default. */
1242 /* Handle deferred command line switches. */
1244 handle_deferred_opts (void)
1249 /* Avoid allocating the deps buffer if we don't need it.
1250 (This flag may be true without there having been -MT or -MQ
1251 options, but we'll still need the deps buffer.) */
1255 deps = cpp_get_deps (parse_in);
1257 for (i = 0; i < deferred_count; i++)
1259 struct deferred_opt *opt = &deferred_opts[i];
1261 if (opt->code == OPT_MT || opt->code == OPT_MQ)
1262 deps_add_target (deps, opt->arg, opt->code == OPT_MQ);
1266 /* These settings are appropriate for GCC, but not necessarily so for
1267 cpplib as a library. */
1269 sanitize_cpp_opts (void)
1271 /* If we don't know what style of dependencies to output, complain
1272 if any other dependency switches have been given. */
1273 if (deps_seen && cpp_opts->deps.style == DEPS_NONE)
1274 error ("to generate dependencies you must specify either -M or -MM");
1276 /* -dM and dependencies suppress normal output; do it here so that
1277 the last -d[MDN] switch overrides earlier ones. */
1278 if (flag_dump_macros == 'M')
1281 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1282 -dM since at least glibc relies on -M -dM to work. */
1283 /* Also, flag_no_output implies flag_no_line_commands, always. */
1286 if (flag_dump_macros != 'M')
1287 flag_dump_macros = 0;
1288 flag_dump_includes = 0;
1289 flag_no_line_commands = 1;
1292 cpp_opts->unsigned_char = !flag_signed_char;
1293 cpp_opts->stdc_0_in_system_headers = STDC_0_IN_SYSTEM_HEADERS;
1295 /* We want -Wno-long-long to override -pedantic -std=non-c99
1296 and/or -Wtraditional, whatever the ordering. */
1297 cpp_opts->warn_long_long
1298 = warn_long_long && ((!flag_isoc99 && pedantic) || warn_traditional);
1300 /* Similarly with -Wno-variadic-macros. No check for c99 here, since
1301 this also turns off warnings about GCCs extension. */
1302 cpp_opts->warn_variadic_macros
1303 = warn_variadic_macros && (pedantic || warn_traditional);
1305 /* If we're generating preprocessor output, emit current directory
1306 if explicitly requested or if debugging information is enabled.
1307 ??? Maybe we should only do it for debugging formats that
1308 actually output the current directory? */
1309 if (flag_working_directory == -1)
1310 flag_working_directory = (debug_info_level != DINFO_LEVEL_NONE);
1313 /* Add include path with a prefix at the front of its name. */
1315 add_prefixed_path (const char *suffix, size_t chain)
1319 size_t prefix_len, suffix_len;
1321 suffix_len = strlen (suffix);
1322 prefix = iprefix ? iprefix : cpp_GCC_INCLUDE_DIR;
1323 prefix_len = iprefix ? strlen (iprefix) : cpp_GCC_INCLUDE_DIR_len;
1325 path = (char *) xmalloc (prefix_len + suffix_len + 1);
1326 memcpy (path, prefix, prefix_len);
1327 memcpy (path + prefix_len, suffix, suffix_len);
1328 path[prefix_len + suffix_len] = '\0';
1330 add_path (path, chain, 0, false);
1333 /* Handle -D, -U, -A, -imacros, and the first -include. */
1335 finish_options (void)
1337 if (!cpp_opts->preprocessed)
1341 cb_file_change (parse_in,
1342 linemap_add (&line_table, LC_RENAME, 0,
1343 _("<built-in>"), 0));
1345 cpp_init_builtins (parse_in, flag_hosted);
1346 c_cpp_builtins (parse_in);
1348 /* We're about to send user input to cpplib, so make it warn for
1349 things that we previously (when we sent it internal definitions)
1350 told it to not warn.
1352 C99 permits implementation-defined characters in identifiers.
1353 The documented meaning of -std= is to turn off extensions that
1354 conflict with the specified standard, and since a strictly
1355 conforming program cannot contain a '$', we do not condition
1356 their acceptance on the -std= setting. */
1357 cpp_opts->warn_dollars = (cpp_opts->pedantic && !cpp_opts->c99);
1359 cpp_change_file (parse_in, LC_RENAME, _("<command line>"));
1360 for (i = 0; i < deferred_count; i++)
1362 struct deferred_opt *opt = &deferred_opts[i];
1364 if (opt->code == OPT_D)
1365 cpp_define (parse_in, opt->arg);
1366 else if (opt->code == OPT_U)
1367 cpp_undef (parse_in, opt->arg);
1368 else if (opt->code == OPT_A)
1370 if (opt->arg[0] == '-')
1371 cpp_unassert (parse_in, opt->arg + 1);
1373 cpp_assert (parse_in, opt->arg);
1377 /* Handle -imacros after -D and -U. */
1378 for (i = 0; i < deferred_count; i++)
1380 struct deferred_opt *opt = &deferred_opts[i];
1382 if (opt->code == OPT_imacros
1383 && cpp_push_include (parse_in, opt->arg))
1385 /* Disable push_command_line_include callback for now. */
1386 include_cursor = deferred_count + 1;
1387 cpp_scan_nooutput (parse_in);
1393 push_command_line_include ();
1396 /* Give CPP the next file given by -include, if any. */
1398 push_command_line_include (void)
1400 while (include_cursor < deferred_count)
1402 struct deferred_opt *opt = &deferred_opts[include_cursor++];
1404 if (!cpp_opts->preprocessed && opt->code == OPT_include
1405 && cpp_push_include (parse_in, opt->arg))
1409 if (include_cursor == deferred_count)
1412 /* -Wunused-macros should only warn about macros defined hereafter. */
1413 cpp_opts->warn_unused_macros = warn_unused_macros;
1414 /* Restore the line map from <command line>. */
1415 if (!cpp_opts->preprocessed)
1416 cpp_change_file (parse_in, LC_RENAME, this_input_filename);
1418 /* Set this here so the client can change the option if it wishes,
1419 and after stacking the main file so we don't trace the main file. */
1420 line_table.trace_includes = cpp_opts->print_include_names;
1424 /* File change callback. Has to handle -include files. */
1426 cb_file_change (cpp_reader * ARG_UNUSED (pfile),
1427 const struct line_map *new_map)
1429 if (flag_preprocess_only)
1430 pp_file_change (new_map);
1432 fe_file_change (new_map);
1434 if (new_map == 0 || (new_map->reason == LC_LEAVE && MAIN_FILE_P (new_map)))
1435 push_command_line_include ();
1439 cb_dir_change (cpp_reader * ARG_UNUSED (pfile), const char *dir)
1441 if (!set_src_pwd (dir))
1442 warning (0, "too late for # directive to set debug directory");
1445 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1446 extensions if ISO). There is no concept of gnu94. */
1448 set_std_c89 (int c94, int iso)
1450 cpp_set_lang (parse_in, c94 ? CLK_STDC94: iso ? CLK_STDC89: CLK_GNUC89);
1453 flag_no_gnu_keywords = iso;
1454 flag_no_nonansi_builtin = iso;
1459 /* Set the C 99 standard (without GNU extensions if ISO). */
1461 set_std_c99 (int iso)
1463 cpp_set_lang (parse_in, iso ? CLK_STDC99: CLK_GNUC99);
1465 flag_no_nonansi_builtin = iso;
1471 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1473 set_std_cxx98 (int iso)
1475 cpp_set_lang (parse_in, iso ? CLK_CXX98: CLK_GNUCXX);
1476 flag_no_gnu_keywords = iso;
1477 flag_no_nonansi_builtin = iso;
1481 /* Handle setting implicit to ON. */
1483 set_Wimplicit (int on)
1486 warn_implicit_int = on;
1489 if (mesg_implicit_function_declaration != 2)
1490 mesg_implicit_function_declaration = 1;
1493 mesg_implicit_function_declaration = 0;
1496 /* Args to -d specify what to dump. Silently ignore
1497 unrecognized options; they may be aimed at toplev.c. */
1499 handle_OPT_d (const char *arg)
1503 while ((c = *arg++) != '\0')
1506 case 'M': /* Dump macros only. */
1507 case 'N': /* Dump names. */
1508 case 'D': /* Dump definitions. */
1509 flag_dump_macros = c;
1513 flag_dump_includes = 1;