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_nonvdtor = value;
413 warn_reorder = value;
414 warn_nontemplate_friend = value;
417 cpp_opts->warn_trigraphs = value;
418 cpp_opts->warn_comments = value;
419 cpp_opts->warn_num_sign_change = value;
420 cpp_opts->warn_multichar = value; /* Was C++ only. */
425 cpp_opts->warn_comments = value;
428 case OPT_Wdeprecated:
429 cpp_opts->warn_deprecated = value;
432 case OPT_Wdiv_by_zero:
433 warn_div_by_zero = value;
436 case OPT_Wendif_labels:
437 cpp_opts->warn_endif_labels = value;
441 cpp_opts->warnings_are_errors = value;
442 global_dc->warning_as_error_requested = value;
445 case OPT_Werror_implicit_function_declaration:
446 mesg_implicit_function_declaration = 2;
454 set_Wformat (atoi (arg));
458 set_Wimplicit (value);
462 /* Silently ignore for now. */
465 case OPT_Winvalid_pch:
466 cpp_opts->warn_invalid_pch = value;
476 case OPT_Wmissing_include_dirs:
477 cpp_opts->warn_missing_include_dirs = value;
481 cpp_opts->warn_multichar = value;
484 case OPT_Wnormalized_:
485 if (!value || (arg && strcasecmp (arg, "none") == 0))
486 cpp_opts->warn_normalize = normalized_none;
487 else if (!arg || strcasecmp (arg, "nfkc") == 0)
488 cpp_opts->warn_normalize = normalized_KC;
489 else if (strcasecmp (arg, "id") == 0)
490 cpp_opts->warn_normalize = normalized_identifier_C;
491 else if (strcasecmp (arg, "nfc") == 0)
492 cpp_opts->warn_normalize = normalized_C;
494 error ("argument %qs to %<-Wnormalized%> not recognized", arg);
497 case OPT_Wreturn_type:
498 warn_return_type = value;
501 case OPT_Wstrict_null_sentinel:
502 warn_strict_null_sentinel = value;
505 case OPT_Wsystem_headers:
506 cpp_opts->warn_system_headers = value;
509 case OPT_Wtraditional:
510 cpp_opts->warn_traditional = value;
514 cpp_opts->warn_trigraphs = value;
518 cpp_opts->warn_undef = value;
521 case OPT_Wunknown_pragmas:
522 /* Set to greater than 1, so that even unknown pragmas in
523 system headers will be warned about. */
524 warn_unknown_pragmas = value * 2;
527 case OPT_Wunused_macros:
528 warn_unused_macros = value;
531 case OPT_Wvariadic_macros:
532 warn_variadic_macros = value;
535 case OPT_Wwrite_strings:
536 if (!c_dialect_cxx ())
537 flag_const_strings = value;
539 warn_write_strings = value;
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_fconst_strings:
652 flag_const_strings = value;
655 case OPT_fconstant_string_class_:
656 constant_string_class_name = arg;
659 case OPT_fdefault_inline:
660 flag_default_inline = value;
663 case OPT_felide_constructors:
664 flag_elide_constructors = value;
667 case OPT_fenforce_eh_specs:
668 flag_enforce_eh_specs = value;
671 case OPT_fextended_identifiers:
672 cpp_opts->extended_identifiers = value;
676 flag_new_for_scope = value;
679 case OPT_fgnu_keywords:
680 flag_no_gnu_keywords = !value;
683 case OPT_fgnu_runtime:
684 flag_next_runtime = !value;
687 case OPT_fhandle_exceptions:
688 warning (0, "-fhandle-exceptions has been renamed -fexceptions (and is now on by default)");
689 flag_exceptions = value;
692 case OPT_fimplement_inlines:
693 flag_implement_inlines = value;
696 case OPT_fimplicit_inline_templates:
697 flag_implicit_inline_templates = value;
700 case OPT_fimplicit_templates:
701 flag_implicit_templates = value;
704 case OPT_fms_extensions:
705 flag_ms_extensions = value;
708 case OPT_fnext_runtime:
709 flag_next_runtime = value;
712 case OPT_fnil_receivers:
713 flag_nil_receivers = value;
716 case OPT_fnonansi_builtins:
717 flag_no_nonansi_builtin = !value;
720 case OPT_foperator_names:
721 cpp_opts->operator_names = value;
724 case OPT_foptional_diags:
725 flag_optional_diags = value;
729 cpp_opts->restore_pch_deps = value;
732 case OPT_fpch_preprocess:
733 flag_pch_preprocess = value;
736 case OPT_fpermissive:
737 flag_permissive = value;
740 case OPT_fpreprocessed:
741 cpp_opts->preprocessed = value;
744 case OPT_freplace_objc_classes:
745 flag_replace_objc_classes = value;
749 flag_use_repository = value;
751 flag_implicit_templates = 0;
758 case OPT_fshow_column:
759 cpp_opts->show_column = value;
763 flag_detailed_statistics = value;
767 /* It is documented that we silently ignore silly values. */
768 if (value >= 1 && value <= 100)
769 cpp_opts->tabstop = value;
772 case OPT_fexec_charset_:
773 cpp_opts->narrow_charset = arg;
776 case OPT_fwide_exec_charset_:
777 cpp_opts->wide_charset = arg;
780 case OPT_finput_charset_:
781 cpp_opts->input_charset = arg;
784 case OPT_ftemplate_depth_:
785 max_tinst_depth = value;
788 case OPT_fuse_cxa_atexit:
789 flag_use_cxa_atexit = value;
792 case OPT_fvisibility_inlines_hidden:
793 visibility_options.inlines_hidden = value;
800 case OPT_fthreadsafe_statics:
801 flag_threadsafe_statics = value;
805 flag_zero_link = value;
809 flag_gen_declaration = 1;
813 add_path (xstrdup (arg), AFTER, 0, true);
818 defer_opt (code, arg);
830 add_path (xstrdup (arg), QUOTE, 0, true);
838 add_path (xstrdup (arg), SYSTEM, 0, true);
841 case OPT_iwithprefix:
842 add_prefixed_path (arg, SYSTEM);
845 case OPT_iwithprefixbefore:
846 add_prefixed_path (arg, BRACKET);
850 cpp_set_lang (parse_in, CLK_ASM);
851 cpp_opts->dollars_in_ident = false;
854 case OPT_lang_fortran:
874 error ("output filename specified twice");
877 /* We need to handle the -pedantic switches here, rather than in
878 c_common_post_options, so that a subsequent -Wno-endif-labels
879 is not overridden. */
880 case OPT_pedantic_errors:
881 cpp_opts->pedantic_errors = 1;
884 cpp_opts->pedantic = 1;
885 cpp_opts->warn_endif_labels = 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 /* Special format checking options don't work without -Wformat; warn if
1010 warning (OPT_Wformat_y2k,
1011 "-Wformat-y2k ignored without -Wformat");
1012 warning (OPT_Wformat_extra_args,
1013 "-Wformat-extra-args ignored without -Wformat");
1014 warning (OPT_Wformat_zero_length,
1015 "-Wformat-zero-length ignored without -Wformat");
1016 warning (OPT_Wformat_nonliteral,
1017 "-Wformat-nonliteral ignored without -Wformat");
1018 warning (OPT_Wformat_security,
1019 "-Wformat-security ignored without -Wformat");
1022 /* C99 requires special handling of complex multiplication and division;
1023 -ffast-math and -fcx-limited-range are handled in process_options. */
1025 flag_complex_method = 2;
1027 if (flag_preprocess_only)
1029 /* Open the output now. We must do so even if flag_no_output is
1030 on, because there may be other output than from the actual
1031 preprocessing (e.g. from -dM). */
1032 if (out_fname[0] == '\0')
1033 out_stream = stdout;
1035 out_stream = fopen (out_fname, "w");
1037 if (out_stream == NULL)
1039 fatal_error ("opening output file %s: %m", out_fname);
1043 if (num_in_fnames > 1)
1044 error ("too many filenames given. Type %s --help for usage",
1047 init_pp_output (out_stream);
1053 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1054 input_location = UNKNOWN_LOCATION;
1057 cb = cpp_get_callbacks (parse_in);
1058 cb->file_change = cb_file_change;
1059 cb->dir_change = cb_dir_change;
1060 cpp_post_options (parse_in);
1062 input_location = UNKNOWN_LOCATION;
1064 /* If an error has occurred in cpplib, note it so we fail
1066 errorcount += cpp_errors (parse_in);
1068 *pfilename = this_input_filename
1069 = cpp_read_main_file (parse_in, in_fnames[0]);
1070 /* Don't do any compilation or preprocessing if there is no input file. */
1071 if (this_input_filename == NULL)
1077 if (flag_working_directory
1078 && flag_preprocess_only && !flag_no_line_commands)
1079 pp_dir_change (parse_in, get_src_pwd ());
1081 return flag_preprocess_only;
1084 /* Front end initialization common to C, ObjC and C++. */
1086 c_common_init (void)
1088 /* Set up preprocessor arithmetic. Must be done after call to
1089 c_common_nodes_and_builtins for type nodes to be good. */
1090 cpp_opts->precision = TYPE_PRECISION (intmax_type_node);
1091 cpp_opts->char_precision = TYPE_PRECISION (char_type_node);
1092 cpp_opts->int_precision = TYPE_PRECISION (integer_type_node);
1093 cpp_opts->wchar_precision = TYPE_PRECISION (wchar_type_node);
1094 cpp_opts->unsigned_wchar = TYPE_UNSIGNED (wchar_type_node);
1095 cpp_opts->bytes_big_endian = BYTES_BIG_ENDIAN;
1097 /* This can't happen until after wchar_precision and bytes_big_endian
1099 cpp_init_iconv (parse_in);
1102 c_common_print_pch_checksum (stderr);
1104 if (flag_preprocess_only)
1107 preprocess_file (parse_in);
1111 /* Has to wait until now so that cpplib has its hash table. */
1117 /* Initialize the integrated preprocessor after debug output has been
1118 initialized; loop over each input file. */
1120 c_common_parse_file (int set_yydebug)
1124 /* Enable parser debugging, if requested and we can. If requested
1125 and we can't, notify the user. */
1127 yydebug = set_yydebug;
1130 warning (0, "YYDEBUG was not defined at build time, -dy ignored");
1136 /* Start the main input file, if the debug writer wants it. */
1137 if (debug_hooks->start_end_main_source_file)
1138 (*debug_hooks->start_source_file) (0, this_input_filename);
1145 /* And end the main input file, if the debug writer wants it */
1146 if (debug_hooks->start_end_main_source_file)
1147 (*debug_hooks->end_source_file) (0);
1148 if (++i >= num_in_fnames)
1150 cpp_undef_all (parse_in);
1152 = cpp_read_main_file (parse_in, in_fnames[i]);
1153 /* If an input file is missing, abandon further compilation.
1154 cpplib has issued a diagnostic. */
1155 if (!this_input_filename)
1160 /* Common finish hook for the C, ObjC and C++ front ends. */
1162 c_common_finish (void)
1164 FILE *deps_stream = NULL;
1166 if (cpp_opts->deps.style != DEPS_NONE)
1168 /* If -M or -MM was seen without -MF, default output to the
1171 deps_stream = out_stream;
1174 deps_stream = fopen (deps_file, deps_append ? "a": "w");
1176 fatal_error ("opening dependency file %s: %m", deps_file);
1180 /* For performance, avoid tearing down cpplib's internal structures
1181 with cpp_destroy (). */
1182 errorcount += cpp_finish (parse_in, deps_stream);
1184 if (deps_stream && deps_stream != out_stream
1185 && (ferror (deps_stream) || fclose (deps_stream)))
1186 fatal_error ("closing dependency file %s: %m", deps_file);
1188 if (out_stream && (ferror (out_stream) || fclose (out_stream)))
1189 fatal_error ("when writing output to %s: %m", out_fname);
1192 /* Either of two environment variables can specify output of
1193 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1194 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1195 and DEPS_TARGET is the target to mention in the deps. They also
1196 result in dependency information being appended to the output file
1197 rather than overwriting it, and like Sun's compiler
1198 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1200 check_deps_environment_vars (void)
1204 GET_ENVIRONMENT (spec, "DEPENDENCIES_OUTPUT");
1206 cpp_opts->deps.style = DEPS_USER;
1209 GET_ENVIRONMENT (spec, "SUNPRO_DEPENDENCIES");
1212 cpp_opts->deps.style = DEPS_SYSTEM;
1213 cpp_opts->deps.ignore_main_file = true;
1219 /* Find the space before the DEPS_TARGET, if there is one. */
1220 char *s = strchr (spec, ' ');
1223 /* Let the caller perform MAKE quoting. */
1224 defer_opt (OPT_MT, s + 1);
1228 /* Command line -MF overrides environment variables and default. */
1237 /* Handle deferred command line switches. */
1239 handle_deferred_opts (void)
1244 /* Avoid allocating the deps buffer if we don't need it.
1245 (This flag may be true without there having been -MT or -MQ
1246 options, but we'll still need the deps buffer.) */
1250 deps = cpp_get_deps (parse_in);
1252 for (i = 0; i < deferred_count; i++)
1254 struct deferred_opt *opt = &deferred_opts[i];
1256 if (opt->code == OPT_MT || opt->code == OPT_MQ)
1257 deps_add_target (deps, opt->arg, opt->code == OPT_MQ);
1261 /* These settings are appropriate for GCC, but not necessarily so for
1262 cpplib as a library. */
1264 sanitize_cpp_opts (void)
1266 /* If we don't know what style of dependencies to output, complain
1267 if any other dependency switches have been given. */
1268 if (deps_seen && cpp_opts->deps.style == DEPS_NONE)
1269 error ("to generate dependencies you must specify either -M or -MM");
1271 /* -dM and dependencies suppress normal output; do it here so that
1272 the last -d[MDN] switch overrides earlier ones. */
1273 if (flag_dump_macros == 'M')
1276 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1277 -dM since at least glibc relies on -M -dM to work. */
1278 /* Also, flag_no_output implies flag_no_line_commands, always. */
1281 if (flag_dump_macros != 'M')
1282 flag_dump_macros = 0;
1283 flag_dump_includes = 0;
1284 flag_no_line_commands = 1;
1287 cpp_opts->unsigned_char = !flag_signed_char;
1288 cpp_opts->stdc_0_in_system_headers = STDC_0_IN_SYSTEM_HEADERS;
1290 /* We want -Wno-long-long to override -pedantic -std=non-c99
1291 and/or -Wtraditional, whatever the ordering. */
1292 cpp_opts->warn_long_long
1293 = warn_long_long && ((!flag_isoc99 && pedantic) || warn_traditional);
1295 /* Similarly with -Wno-variadic-macros. No check for c99 here, since
1296 this also turns off warnings about GCCs extension. */
1297 cpp_opts->warn_variadic_macros
1298 = warn_variadic_macros && (pedantic || warn_traditional);
1300 /* If we're generating preprocessor output, emit current directory
1301 if explicitly requested or if debugging information is enabled.
1302 ??? Maybe we should only do it for debugging formats that
1303 actually output the current directory? */
1304 if (flag_working_directory == -1)
1305 flag_working_directory = (debug_info_level != DINFO_LEVEL_NONE);
1308 /* Add include path with a prefix at the front of its name. */
1310 add_prefixed_path (const char *suffix, size_t chain)
1314 size_t prefix_len, suffix_len;
1316 suffix_len = strlen (suffix);
1317 prefix = iprefix ? iprefix : cpp_GCC_INCLUDE_DIR;
1318 prefix_len = iprefix ? strlen (iprefix) : cpp_GCC_INCLUDE_DIR_len;
1320 path = (char *) xmalloc (prefix_len + suffix_len + 1);
1321 memcpy (path, prefix, prefix_len);
1322 memcpy (path + prefix_len, suffix, suffix_len);
1323 path[prefix_len + suffix_len] = '\0';
1325 add_path (path, chain, 0, false);
1328 /* Handle -D, -U, -A, -imacros, and the first -include. */
1330 finish_options (void)
1332 if (!cpp_opts->preprocessed)
1336 cb_file_change (parse_in,
1337 linemap_add (&line_table, LC_RENAME, 0,
1338 _("<built-in>"), 0));
1340 cpp_init_builtins (parse_in, flag_hosted);
1341 c_cpp_builtins (parse_in);
1343 /* We're about to send user input to cpplib, so make it warn for
1344 things that we previously (when we sent it internal definitions)
1345 told it to not warn.
1347 C99 permits implementation-defined characters in identifiers.
1348 The documented meaning of -std= is to turn off extensions that
1349 conflict with the specified standard, and since a strictly
1350 conforming program cannot contain a '$', we do not condition
1351 their acceptance on the -std= setting. */
1352 cpp_opts->warn_dollars = (cpp_opts->pedantic && !cpp_opts->c99);
1354 cpp_change_file (parse_in, LC_RENAME, _("<command line>"));
1355 for (i = 0; i < deferred_count; i++)
1357 struct deferred_opt *opt = &deferred_opts[i];
1359 if (opt->code == OPT_D)
1360 cpp_define (parse_in, opt->arg);
1361 else if (opt->code == OPT_U)
1362 cpp_undef (parse_in, opt->arg);
1363 else if (opt->code == OPT_A)
1365 if (opt->arg[0] == '-')
1366 cpp_unassert (parse_in, opt->arg + 1);
1368 cpp_assert (parse_in, opt->arg);
1372 /* Handle -imacros after -D and -U. */
1373 for (i = 0; i < deferred_count; i++)
1375 struct deferred_opt *opt = &deferred_opts[i];
1377 if (opt->code == OPT_imacros
1378 && cpp_push_include (parse_in, opt->arg))
1380 /* Disable push_command_line_include callback for now. */
1381 include_cursor = deferred_count + 1;
1382 cpp_scan_nooutput (parse_in);
1388 push_command_line_include ();
1391 /* Give CPP the next file given by -include, if any. */
1393 push_command_line_include (void)
1395 while (include_cursor < deferred_count)
1397 struct deferred_opt *opt = &deferred_opts[include_cursor++];
1399 if (!cpp_opts->preprocessed && opt->code == OPT_include
1400 && cpp_push_include (parse_in, opt->arg))
1404 if (include_cursor == deferred_count)
1407 /* -Wunused-macros should only warn about macros defined hereafter. */
1408 cpp_opts->warn_unused_macros = warn_unused_macros;
1409 /* Restore the line map from <command line>. */
1410 if (!cpp_opts->preprocessed)
1411 cpp_change_file (parse_in, LC_RENAME, this_input_filename);
1413 /* Set this here so the client can change the option if it wishes,
1414 and after stacking the main file so we don't trace the main file. */
1415 line_table.trace_includes = cpp_opts->print_include_names;
1419 /* File change callback. Has to handle -include files. */
1421 cb_file_change (cpp_reader * ARG_UNUSED (pfile),
1422 const struct line_map *new_map)
1424 if (flag_preprocess_only)
1425 pp_file_change (new_map);
1427 fe_file_change (new_map);
1429 if (new_map == 0 || (new_map->reason == LC_LEAVE && MAIN_FILE_P (new_map)))
1430 push_command_line_include ();
1434 cb_dir_change (cpp_reader * ARG_UNUSED (pfile), const char *dir)
1436 if (!set_src_pwd (dir))
1437 warning (0, "too late for # directive to set debug directory");
1440 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1441 extensions if ISO). There is no concept of gnu94. */
1443 set_std_c89 (int c94, int iso)
1445 cpp_set_lang (parse_in, c94 ? CLK_STDC94: iso ? CLK_STDC89: CLK_GNUC89);
1448 flag_no_gnu_keywords = iso;
1449 flag_no_nonansi_builtin = iso;
1454 /* Set the C 99 standard (without GNU extensions if ISO). */
1456 set_std_c99 (int iso)
1458 cpp_set_lang (parse_in, iso ? CLK_STDC99: CLK_GNUC99);
1460 flag_no_nonansi_builtin = iso;
1466 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1468 set_std_cxx98 (int iso)
1470 cpp_set_lang (parse_in, iso ? CLK_CXX98: CLK_GNUCXX);
1471 flag_no_gnu_keywords = iso;
1472 flag_no_nonansi_builtin = iso;
1476 /* Handle setting implicit to ON. */
1478 set_Wimplicit (int on)
1481 warn_implicit_int = on;
1484 if (mesg_implicit_function_declaration != 2)
1485 mesg_implicit_function_declaration = 1;
1488 mesg_implicit_function_declaration = 0;
1491 /* Args to -d specify what to dump. Silently ignore
1492 unrecognized options; they may be aimed at toplev.c. */
1494 handle_OPT_d (const char *arg)
1498 while ((c = *arg++) != '\0')
1501 case 'M': /* Dump macros only. */
1502 case 'N': /* Dump names. */
1503 case 'D': /* Dump definitions. */
1504 flag_dump_macros = c;
1508 flag_dump_includes = 1;