1 /* C/ObjC/C++ command line option handling.
2 Copyright (C) 2002, 2003, 2004 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, 59 Temple Place - Suite 330, 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. */
41 #ifndef DOLLARS_IN_IDENTIFIERS
42 # define DOLLARS_IN_IDENTIFIERS true
45 #ifndef TARGET_SYSTEM_ROOT
46 # define TARGET_SYSTEM_ROOT NULL
50 #define TARGET_OPTF(ARG)
53 static int saved_lineno;
56 static cpp_options *cpp_opts;
59 static const char *this_input_filename;
61 /* Filename and stream for preprocessed output. */
62 static const char *out_fname;
63 static FILE *out_stream;
65 /* Append dependencies to deps_file. */
66 static bool deps_append;
68 /* If dependency switches (-MF etc.) have been given. */
69 static bool deps_seen;
74 /* Dependency output file. */
75 static const char *deps_file;
77 /* The prefix given by -iprefix, if any. */
78 static const char *iprefix;
80 /* The system root, if any. Overridden by -isysroot. */
81 static const char *sysroot = TARGET_SYSTEM_ROOT;
83 /* Zero disables all standard directories for headers. */
84 static bool std_inc = true;
86 /* Zero disables the C++-specific standard directories for headers. */
87 static bool std_cxx_inc = true;
89 /* If the quote chain has been split by -I-. */
90 static bool quote_chain_split;
92 /* If -Wunused-macros. */
93 static bool warn_unused_macros;
95 /* If -Wvariadic-macros. */
96 static bool warn_variadic_macros = true;
98 /* Number of deferred options. */
99 static size_t deferred_count;
101 /* Number of deferred options scanned for -include. */
102 static size_t include_cursor;
104 /* Permit Fortran front-end options. */
105 static bool permit_fortran_options;
107 static void set_Wimplicit (int);
108 static void handle_OPT_d (const char *);
109 static void set_std_cxx98 (int);
110 static void set_std_c89 (int, int);
111 static void set_std_c99 (int);
112 static void check_deps_environment_vars (void);
113 static void handle_deferred_opts (void);
114 static void sanitize_cpp_opts (void);
115 static void add_prefixed_path (const char *, size_t);
116 static void push_command_line_include (void);
117 static void cb_file_change (cpp_reader *, const struct line_map *);
118 static void cb_dir_change (cpp_reader *, const char *);
119 static void finish_options (void);
121 #ifndef STDC_0_IN_SYSTEM_HEADERS
122 #define STDC_0_IN_SYSTEM_HEADERS 0
125 /* Holds switches parsed by c_common_handle_option (), but whose
126 handling is deferred to c_common_post_options (). */
127 static void defer_opt (enum opt_code, const char *);
128 static struct deferred_opt
134 /* Complain that switch CODE expects an argument but none was
135 provided. OPT was the command-line option. Return FALSE to get
136 the default message in opts.c, TRUE if we provide a specialized
139 c_common_missing_argument (const char *opt, size_t code)
144 /* Pick up the default message. */
147 case OPT_fconstant_string_class_:
148 error ("no class name specified with \"%s\"", opt);
152 error ("assertion missing after \"%s\"", opt);
157 error ("macro name missing after \"%s\"", opt);
166 error ("missing path after \"%s\"", opt);
175 error ("missing filename after \"%s\"", opt);
180 error ("missing makefile target after \"%s\"", opt);
187 /* Defer option CODE with argument ARG. */
189 defer_opt (enum opt_code code, const char *arg)
191 deferred_opts[deferred_count].code = code;
192 deferred_opts[deferred_count].arg = arg;
196 /* Common initialization before parsing options. */
198 c_common_init_options (unsigned int argc, const char **argv ATTRIBUTE_UNUSED)
200 static const unsigned int lang_flags[] = {CL_C, CL_ObjC, CL_CXX, CL_ObjCXX};
203 /* This is conditionalized only because that is the way the front
204 ends used to do it. Maybe this should be unconditional? */
205 if (c_dialect_cxx ())
207 /* By default wrap lines at 80 characters. Is getenv
208 ("COLUMNS") preferable? */
209 diagnostic_line_cutoff (global_dc) = 80;
210 /* By default, emit location information once for every
211 diagnostic message. */
212 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
215 parse_in = cpp_create_reader (c_dialect_cxx () ? CLK_GNUCXX: CLK_GNUC89,
216 ident_hash, &line_table);
218 cpp_opts = cpp_get_options (parse_in);
219 cpp_opts->dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
220 cpp_opts->objc = c_dialect_objc ();
222 /* Reset to avoid warnings on internal definitions. We set it just
223 before passing on command-line options to cpplib. */
224 cpp_opts->warn_dollars = 0;
226 flag_const_strings = c_dialect_cxx ();
227 flag_exceptions = c_dialect_cxx ();
228 warn_pointer_arith = c_dialect_cxx ();
230 deferred_opts = xmalloc (argc * sizeof (struct deferred_opt));
232 result = lang_flags[c_language];
234 /* If potentially preprocessing Fortran we have to accept its front
235 end options since the driver passes most of them through. */
237 if (c_language == clk_c && argc > 2
238 && !strcmp (argv[2], "-traditional-cpp" ))
240 permit_fortran_options = true;
248 /* Handle switch SCODE with argument ARG. VALUE is true, unless no-
249 form of an -f or -W option was given. Returns 0 if the switch was
250 invalid, a negative number to prevent language-independent
251 processing in toplev.c (a hack necessary for the short-term). */
253 c_common_handle_option (size_t scode, const char *arg, int value)
255 const struct cl_option *option = &cl_options[scode];
256 enum opt_code code = (enum opt_code) scode;
262 result = permit_fortran_options;
265 case OPT__output_pch_:
270 defer_opt (code, arg);
274 cpp_opts->discard_comments = 0;
278 cpp_opts->discard_comments = 0;
279 cpp_opts->discard_comments_in_macro_exp = 0;
283 defer_opt (code, arg);
287 flag_preprocess_only = 1;
291 cpp_opts->print_include_names = 1;
295 TARGET_OPTF (xstrdup (arg));
299 if (strcmp (arg, "-"))
300 add_path (xstrdup (arg), BRACKET, 0, true);
303 if (quote_chain_split)
304 error ("-I- specified twice");
305 quote_chain_split = true;
306 split_quote_chain ();
307 inform ("obsolete option -I- used, please use -iquote instead");
313 /* When doing dependencies with -M or -MM, suppress normal
314 preprocessed output, but still do -dM etc. as software
315 depends on this. Preprocessed output does occur if -MD, -MMD
316 or environment var dependency generation is used. */
317 cpp_opts->deps.style = (code == OPT_M ? DEPS_SYSTEM: DEPS_USER);
319 cpp_opts->inhibit_warnings = 1;
324 cpp_opts->deps.style = (code == OPT_MD ? DEPS_SYSTEM: DEPS_USER);
335 cpp_opts->deps.missing_files = true;
340 cpp_opts->deps.phony_targets = true;
346 defer_opt (code, arg);
350 flag_no_line_commands = 1;
353 case OPT_fworking_directory:
354 flag_working_directory = value;
358 defer_opt (code, arg);
368 set_Wimplicit (value);
369 warn_char_subscripts = value;
370 warn_missing_braces = value;
371 warn_parentheses = value;
372 warn_return_type = value;
373 warn_sequence_point = value; /* Was C only. */
374 if (c_dialect_cxx ())
375 warn_sign_compare = value;
377 warn_strict_aliasing = value;
379 /* Only warn about unknown pragmas that are not in system
381 warn_unknown_pragmas = value;
383 /* We save the value of warn_uninitialized, since if they put
384 -Wuninitialized on the command line, we need to generate a
385 warning about not using it without also specifying -O. */
386 if (warn_uninitialized != 1)
387 warn_uninitialized = (value ? 2 : 0);
389 if (!c_dialect_cxx ())
390 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding
391 can turn it off only if it's not explicit. */
392 warn_main = value * 2;
395 /* C++-specific warnings. */
396 warn_nonvdtor = value;
397 warn_reorder = value;
398 warn_nontemplate_friend = value;
401 cpp_opts->warn_trigraphs = value;
402 cpp_opts->warn_comments = value;
403 cpp_opts->warn_num_sign_change = value;
404 cpp_opts->warn_multichar = value; /* Was C++ only. */
407 case OPT_Wbad_function_cast:
408 warn_bad_function_cast = value;
412 warn_cast_qual = value;
415 case OPT_Wchar_subscripts:
416 warn_char_subscripts = value;
421 cpp_opts->warn_comments = value;
424 case OPT_Wconversion:
425 warn_conversion = value;
428 case OPT_Wctor_dtor_privacy:
429 warn_ctor_dtor_privacy = value;
432 case OPT_Wdeclaration_after_statement:
433 warn_declaration_after_statement = value;
436 case OPT_Wdeprecated:
437 warn_deprecated = value;
438 cpp_opts->warn_deprecated = value;
441 case OPT_Wdiv_by_zero:
442 warn_div_by_zero = value;
449 case OPT_Wendif_labels:
450 cpp_opts->warn_endif_labels = value;
454 cpp_opts->warnings_are_errors = value;
457 case OPT_Werror_implicit_function_declaration:
458 mesg_implicit_function_declaration = 2;
461 case OPT_Wfloat_equal:
462 warn_float_equal = value;
470 set_Wformat (atoi (arg));
473 case OPT_Wformat_extra_args:
474 warn_format_extra_args = value;
477 case OPT_Wformat_nonliteral:
478 warn_format_nonliteral = value;
481 case OPT_Wformat_security:
482 warn_format_security = value;
485 case OPT_Wformat_y2k:
486 warn_format_y2k = value;
489 case OPT_Wformat_zero_length:
490 warn_format_zero_length = value;
494 warn_init_self = value;
498 set_Wimplicit (value);
501 case OPT_Wimplicit_function_declaration:
502 mesg_implicit_function_declaration = value;
505 case OPT_Wimplicit_int:
506 warn_implicit_int = value;
510 /* Silently ignore for now. */
513 case OPT_Winvalid_offsetof:
514 warn_invalid_offsetof = value;
517 case OPT_Winvalid_pch:
518 cpp_opts->warn_invalid_pch = value;
522 warn_long_long = value;
532 case OPT_Wmissing_braces:
533 warn_missing_braces = value;
536 case OPT_Wmissing_declarations:
537 warn_missing_declarations = value;
540 case OPT_Wmissing_format_attribute:
541 warn_missing_format_attribute = value;
544 case OPT_Wmissing_include_dirs:
545 cpp_opts->warn_missing_include_dirs = value;
548 case OPT_Wmissing_prototypes:
549 warn_missing_prototypes = value;
553 cpp_opts->warn_multichar = value;
556 case OPT_Wnested_externs:
557 warn_nested_externs = value;
560 case OPT_Wnon_template_friend:
561 warn_nontemplate_friend = value;
564 case OPT_Wnon_virtual_dtor:
565 warn_nonvdtor = value;
569 warn_nonnull = value;
572 case OPT_Wold_style_definition:
573 warn_old_style_definition = value;
576 case OPT_Wold_style_cast:
577 warn_old_style_cast = value;
580 case OPT_Woverloaded_virtual:
581 warn_overloaded_virtual = value;
584 case OPT_Wparentheses:
585 warn_parentheses = value;
588 case OPT_Wpmf_conversions:
589 warn_pmf2ptr = value;
592 case OPT_Wpointer_arith:
593 warn_pointer_arith = value;
597 warn_protocol = value;
601 warn_selector = value;
604 case OPT_Wredundant_decls:
605 warn_redundant_decls = value;
609 warn_reorder = value;
612 case OPT_Wreturn_type:
613 warn_return_type = value;
616 case OPT_Wsequence_point:
617 warn_sequence_point = value;
620 case OPT_Wsign_compare:
621 warn_sign_compare = value;
624 case OPT_Wsign_promo:
625 warn_sign_promo = value;
628 case OPT_Wstrict_prototypes:
629 warn_strict_prototypes = value;
636 case OPT_Wsystem_headers:
637 cpp_opts->warn_system_headers = value;
640 case OPT_Wtraditional:
641 warn_traditional = value;
642 cpp_opts->warn_traditional = value;
646 cpp_opts->warn_trigraphs = value;
649 case OPT_Wundeclared_selector:
650 warn_undeclared_selector = value;
654 cpp_opts->warn_undef = value;
657 case OPT_Wunknown_pragmas:
658 /* Set to greater than 1, so that even unknown pragmas in
659 system headers will be warned about. */
660 warn_unknown_pragmas = value * 2;
663 case OPT_Wunused_macros:
664 warn_unused_macros = value;
667 case OPT_Wvariadic_macros:
668 warn_variadic_macros = value;
671 case OPT_Wwrite_strings:
672 if (!c_dialect_cxx ())
673 flag_const_strings = value;
675 warn_write_strings = value;
679 if (!c_dialect_cxx ())
680 set_std_c89 (false, true);
682 set_std_cxx98 (true);
689 case OPT_fcond_mismatch:
690 if (!c_dialect_cxx ())
692 flag_cond_mismatch = value;
697 case OPT_fall_virtual:
698 case OPT_falt_external_templates:
699 case OPT_fenum_int_equiv:
700 case OPT_fexternal_templates:
701 case OPT_fguiding_decls:
703 case OPT_fhuge_objects:
705 case OPT_fname_mangling_version_:
707 case OPT_fnonnull_objects:
709 case OPT_fstrict_prototype:
710 case OPT_fthis_is_variable:
711 case OPT_fvtable_thunks:
714 warning ("switch \"%s\" is no longer supported", option->opt_text);
717 case OPT_faccess_control:
718 flag_access_control = value;
722 flag_no_asm = !value;
726 flag_no_builtin = !value;
733 disable_builtin_function (arg);
736 case OPT_fdollars_in_identifiers:
737 cpp_opts->dollars_in_ident = value;
740 case OPT_ffreestanding:
742 /* Fall through.... */
745 flag_no_builtin = !value;
746 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
747 if (!value && warn_main == 2)
751 case OPT_fshort_double:
752 flag_short_double = value;
755 case OPT_fshort_enums:
756 flag_short_enums = value;
759 case OPT_fshort_wchar:
760 flag_short_wchar = value;
763 case OPT_fsigned_bitfields:
764 flag_signed_bitfields = value;
765 explicit_flag_signed_bitfields = 1;
768 case OPT_fsigned_char:
769 flag_signed_char = value;
772 case OPT_funsigned_bitfields:
773 flag_signed_bitfields = !value;
774 explicit_flag_signed_bitfields = 1;
777 case OPT_funsigned_char:
778 flag_signed_char = !value;
782 flag_check_new = value;
785 case OPT_fconserve_space:
786 flag_conserve_space = value;
789 case OPT_fconst_strings:
790 flag_const_strings = value;
793 case OPT_fconstant_string_class_:
794 constant_string_class_name = arg;
797 case OPT_fdefault_inline:
798 flag_default_inline = value;
801 case OPT_felide_constructors:
802 flag_elide_constructors = value;
805 case OPT_fenforce_eh_specs:
806 flag_enforce_eh_specs = value;
809 case OPT_ffixed_form:
810 case OPT_ffixed_line_length_:
811 /* Fortran front end options ignored when preprocessing only. */
812 if (!flag_preprocess_only)
817 flag_new_for_scope = value;
820 case OPT_fgnu_keywords:
821 flag_no_gnu_keywords = !value;
824 case OPT_fgnu_runtime:
825 flag_next_runtime = !value;
828 case OPT_fhandle_exceptions:
829 warning ("-fhandle-exceptions has been renamed -fexceptions (and is now on by default)");
830 flag_exceptions = value;
833 case OPT_fimplement_inlines:
834 flag_implement_inlines = value;
837 case OPT_fimplicit_inline_templates:
838 flag_implicit_inline_templates = value;
841 case OPT_fimplicit_templates:
842 flag_implicit_templates = value;
845 case OPT_fms_extensions:
846 flag_ms_extensions = value;
849 case OPT_fnext_runtime:
850 flag_next_runtime = value;
853 case OPT_fnil_receivers:
854 flag_nil_receivers = value;
857 case OPT_fnonansi_builtins:
858 flag_no_nonansi_builtin = !value;
861 case OPT_fobjc_exceptions:
862 flag_objc_exceptions = value;
865 case OPT_foperator_names:
866 cpp_opts->operator_names = value;
869 case OPT_foptional_diags:
870 flag_optional_diags = value;
874 cpp_opts->restore_pch_deps = value;
877 case OPT_fpermissive:
878 flag_permissive = value;
881 case OPT_fpreprocessed:
882 cpp_opts->preprocessed = value;
885 case OPT_freplace_objc_classes:
886 flag_replace_objc_classes = value;
890 flag_use_repository = value;
892 flag_implicit_templates = 0;
899 case OPT_fshow_column:
900 cpp_opts->show_column = value;
904 flag_detailed_statistics = value;
908 /* It is documented that we silently ignore silly values. */
909 if (value >= 1 && value <= 100)
910 cpp_opts->tabstop = value;
913 case OPT_fexec_charset_:
914 cpp_opts->narrow_charset = arg;
917 case OPT_fwide_exec_charset_:
918 cpp_opts->wide_charset = arg;
921 case OPT_finput_charset_:
922 cpp_opts->input_charset = arg;
925 case OPT_ftemplate_depth_:
926 max_tinst_depth = value;
929 case OPT_fuse_cxa_atexit:
930 flag_use_cxa_atexit = value;
938 flag_zero_link = value;
942 flag_gen_declaration = 1;
946 add_path (xstrdup (arg), AFTER, 0, true);
951 defer_opt (code, arg);
959 add_path (xstrdup (arg), QUOTE, 0, true);
967 add_path (xstrdup (arg), SYSTEM, 0, true);
970 case OPT_iwithprefix:
971 add_prefixed_path (arg, SYSTEM);
974 case OPT_iwithprefixbefore:
975 add_prefixed_path (arg, BRACKET);
979 cpp_set_lang (parse_in, CLK_ASM);
980 cpp_opts->dollars_in_ident = false;
999 error ("output filename specified twice");
1002 /* We need to handle the -pedantic switches here, rather than in
1003 c_common_post_options, so that a subsequent -Wno-endif-labels
1004 is not overridden. */
1005 case OPT_pedantic_errors:
1006 cpp_opts->pedantic_errors = 1;
1009 cpp_opts->pedantic = 1;
1010 cpp_opts->warn_endif_labels = 1;
1013 case OPT_print_objc_runtime_info:
1014 print_struct_values = 1;
1018 cpp_opts->remap = 1;
1022 case OPT_std_gnu__98:
1023 set_std_cxx98 (code == OPT_std_c__98 /* ISO */);
1027 case OPT_std_iso9899_1990:
1028 case OPT_std_iso9899_199409:
1029 set_std_c89 (code == OPT_std_iso9899_199409 /* c94 */, true /* ISO */);
1033 set_std_c89 (false /* c94 */, false /* ISO */);
1038 case OPT_std_iso9899_1999:
1039 case OPT_std_iso9899_199x:
1040 set_std_c99 (true /* ISO */);
1045 set_std_c99 (false /* ISO */);
1049 cpp_opts->trigraphs = 1;
1052 case OPT_traditional_cpp:
1053 cpp_opts->traditional = 1;
1061 cpp_opts->inhibit_warnings = 1;
1072 /* Post-switch processing. */
1074 c_common_post_options (const char **pfilename)
1076 struct cpp_callbacks *cb;
1078 /* Canonicalize the input and output filenames. */
1079 if (in_fnames == NULL)
1081 in_fnames = xmalloc (sizeof (in_fnames[0]));
1084 else if (strcmp (in_fnames[0], "-") == 0)
1087 if (out_fname == NULL || !strcmp (out_fname, "-"))
1090 if (cpp_opts->deps.style == DEPS_NONE)
1091 check_deps_environment_vars ();
1093 handle_deferred_opts ();
1095 sanitize_cpp_opts ();
1097 register_include_chains (parse_in, sysroot, iprefix,
1098 std_inc, std_cxx_inc && c_dialect_cxx (), verbose);
1100 flag_inline_trees = 1;
1102 /* Use tree inlining. */
1103 if (!flag_no_inline)
1105 if (flag_inline_functions)
1107 flag_inline_trees = 2;
1108 flag_inline_functions = 0;
1111 /* -Wextra implies -Wsign-compare, but not if explicitly
1113 if (warn_sign_compare == -1)
1114 warn_sign_compare = extra_warnings;
1116 /* Special format checking options don't work without -Wformat; warn if
1118 if (warn_format_y2k && !warn_format)
1119 warning ("-Wformat-y2k ignored without -Wformat");
1120 if (warn_format_extra_args && !warn_format)
1121 warning ("-Wformat-extra-args ignored without -Wformat");
1122 if (warn_format_zero_length && !warn_format)
1123 warning ("-Wformat-zero-length ignored without -Wformat");
1124 if (warn_format_nonliteral && !warn_format)
1125 warning ("-Wformat-nonliteral ignored without -Wformat");
1126 if (warn_format_security && !warn_format)
1127 warning ("-Wformat-security ignored without -Wformat");
1128 if (warn_missing_format_attribute && !warn_format)
1129 warning ("-Wmissing-format-attribute ignored without -Wformat");
1131 if (flag_preprocess_only)
1133 /* Open the output now. We must do so even if flag_no_output is
1134 on, because there may be other output than from the actual
1135 preprocessing (e.g. from -dM). */
1136 if (out_fname[0] == '\0')
1137 out_stream = stdout;
1139 out_stream = fopen (out_fname, "w");
1141 if (out_stream == NULL)
1143 fatal_error ("opening output file %s: %m", out_fname);
1147 if (num_in_fnames > 1)
1148 error ("too many filenames given. Type %s --help for usage",
1151 init_pp_output (out_stream);
1157 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1161 cb = cpp_get_callbacks (parse_in);
1162 cb->file_change = cb_file_change;
1163 cb->dir_change = cb_dir_change;
1164 cpp_post_options (parse_in);
1166 saved_lineno = input_line;
1169 /* If an error has occurred in cpplib, note it so we fail
1171 errorcount += cpp_errors (parse_in);
1173 *pfilename = this_input_filename
1174 = cpp_read_main_file (parse_in, in_fnames[0]);
1175 /* Don't do any compilation or preprocessing if there is no input file. */
1176 if (this_input_filename == NULL)
1182 if (flag_working_directory
1183 && flag_preprocess_only && ! flag_no_line_commands)
1184 pp_dir_change (parse_in, get_src_pwd ());
1186 return flag_preprocess_only;
1189 /* Front end initialization common to C, ObjC and C++. */
1191 c_common_init (void)
1193 input_line = saved_lineno;
1195 /* Set up preprocessor arithmetic. Must be done after call to
1196 c_common_nodes_and_builtins for type nodes to be good. */
1197 cpp_opts->precision = TYPE_PRECISION (intmax_type_node);
1198 cpp_opts->char_precision = TYPE_PRECISION (char_type_node);
1199 cpp_opts->int_precision = TYPE_PRECISION (integer_type_node);
1200 cpp_opts->wchar_precision = TYPE_PRECISION (wchar_type_node);
1201 cpp_opts->unsigned_wchar = TYPE_UNSIGNED (wchar_type_node);
1202 cpp_opts->bytes_big_endian = BYTES_BIG_ENDIAN;
1204 /* This can't happen until after wchar_precision and bytes_big_endian
1206 cpp_init_iconv (parse_in);
1208 if (flag_preprocess_only)
1211 preprocess_file (parse_in);
1215 /* Has to wait until now so that cpplib has its hash table. */
1221 /* Initialize the integrated preprocessor after debug output has been
1222 initialized; loop over each input file. */
1224 c_common_parse_file (int set_yydebug)
1227 yydebug = set_yydebug;
1230 warning ("YYDEBUG not defined");
1233 if (num_in_fnames > 1)
1234 fatal_error ("sorry, inter-module analysis temporarily out of commission");
1244 /* Common finish hook for the C, ObjC and C++ front ends. */
1246 c_common_finish (void)
1248 FILE *deps_stream = NULL;
1250 if (cpp_opts->deps.style != DEPS_NONE)
1252 /* If -M or -MM was seen without -MF, default output to the
1255 deps_stream = out_stream;
1258 deps_stream = fopen (deps_file, deps_append ? "a": "w");
1260 fatal_error ("opening dependency file %s: %m", deps_file);
1264 /* For performance, avoid tearing down cpplib's internal structures
1265 with cpp_destroy (). */
1266 errorcount += cpp_finish (parse_in, deps_stream);
1268 if (deps_stream && deps_stream != out_stream
1269 && (ferror (deps_stream) || fclose (deps_stream)))
1270 fatal_error ("closing dependency file %s: %m", deps_file);
1272 if (out_stream && (ferror (out_stream) || fclose (out_stream)))
1273 fatal_error ("when writing output to %s: %m", out_fname);
1276 /* Either of two environment variables can specify output of
1277 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1278 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1279 and DEPS_TARGET is the target to mention in the deps. They also
1280 result in dependency information being appended to the output file
1281 rather than overwriting it, and like Sun's compiler
1282 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1284 check_deps_environment_vars (void)
1288 GET_ENVIRONMENT (spec, "DEPENDENCIES_OUTPUT");
1290 cpp_opts->deps.style = DEPS_USER;
1293 GET_ENVIRONMENT (spec, "SUNPRO_DEPENDENCIES");
1296 cpp_opts->deps.style = DEPS_SYSTEM;
1297 cpp_opts->deps.ignore_main_file = true;
1303 /* Find the space before the DEPS_TARGET, if there is one. */
1304 char *s = strchr (spec, ' ');
1307 /* Let the caller perform MAKE quoting. */
1308 defer_opt (OPT_MT, s + 1);
1312 /* Command line -MF overrides environment variables and default. */
1320 /* Handle deferred command line switches. */
1322 handle_deferred_opts (void)
1326 for (i = 0; i < deferred_count; i++)
1328 struct deferred_opt *opt = &deferred_opts[i];
1330 if (opt->code == OPT_MT || opt->code == OPT_MQ)
1331 cpp_add_dependency_target (parse_in, opt->arg, opt->code == OPT_MQ);
1335 /* These settings are appropriate for GCC, but not necessarily so for
1336 cpplib as a library. */
1338 sanitize_cpp_opts (void)
1340 /* If we don't know what style of dependencies to output, complain
1341 if any other dependency switches have been given. */
1342 if (deps_seen && cpp_opts->deps.style == DEPS_NONE)
1343 error ("to generate dependencies you must specify either -M or -MM");
1345 /* -dM and dependencies suppress normal output; do it here so that
1346 the last -d[MDN] switch overrides earlier ones. */
1347 if (flag_dump_macros == 'M')
1350 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1351 -dM since at least glibc relies on -M -dM to work. */
1354 if (flag_dump_macros != 'M')
1355 flag_dump_macros = 0;
1356 flag_dump_includes = 0;
1359 cpp_opts->unsigned_char = !flag_signed_char;
1360 cpp_opts->stdc_0_in_system_headers = STDC_0_IN_SYSTEM_HEADERS;
1362 /* We want -Wno-long-long to override -pedantic -std=non-c99
1363 and/or -Wtraditional, whatever the ordering. */
1364 cpp_opts->warn_long_long
1365 = warn_long_long && ((!flag_isoc99 && pedantic) || warn_traditional);
1367 /* Similarly with -Wno-variadic-macros. No check for c99 here, since
1368 this also turns off warnings about GCCs extension. */
1369 cpp_opts->warn_variadic_macros
1370 = warn_variadic_macros && (pedantic || warn_traditional);
1372 /* If we're generating preprocessor output, emit current directory
1373 if explicitly requested or if debugging information is enabled.
1374 ??? Maybe we should only do it for debugging formats that
1375 actually output the current directory? */
1376 if (flag_working_directory == -1)
1377 flag_working_directory = (debug_info_level != DINFO_LEVEL_NONE);
1380 /* Add include path with a prefix at the front of its name. */
1382 add_prefixed_path (const char *suffix, size_t chain)
1386 size_t prefix_len, suffix_len;
1388 suffix_len = strlen (suffix);
1389 prefix = iprefix ? iprefix : cpp_GCC_INCLUDE_DIR;
1390 prefix_len = iprefix ? strlen (iprefix) : cpp_GCC_INCLUDE_DIR_len;
1392 path = xmalloc (prefix_len + suffix_len + 1);
1393 memcpy (path, prefix, prefix_len);
1394 memcpy (path + prefix_len, suffix, suffix_len);
1395 path[prefix_len + suffix_len] = '\0';
1397 add_path (path, chain, 0, false);
1400 /* Handle -D, -U, -A, -imacros, and the first -include. */
1402 finish_options (void)
1404 if (!cpp_opts->preprocessed)
1408 cpp_change_file (parse_in, LC_RENAME, _("<built-in>"));
1409 cpp_init_builtins (parse_in, flag_hosted);
1410 c_cpp_builtins (parse_in);
1412 /* We're about to send user input to cpplib, so make it warn for
1413 things that we previously (when we sent it internal definitions)
1414 told it to not warn.
1416 C99 permits implementation-defined characters in identifiers.
1417 The documented meaning of -std= is to turn off extensions that
1418 conflict with the specified standard, and since a strictly
1419 conforming program cannot contain a '$', we do not condition
1420 their acceptance on the -std= setting. */
1421 cpp_opts->warn_dollars = (cpp_opts->pedantic && !cpp_opts->c99);
1423 cpp_change_file (parse_in, LC_RENAME, _("<command line>"));
1424 for (i = 0; i < deferred_count; i++)
1426 struct deferred_opt *opt = &deferred_opts[i];
1428 if (opt->code == OPT_D)
1429 cpp_define (parse_in, opt->arg);
1430 else if (opt->code == OPT_U)
1431 cpp_undef (parse_in, opt->arg);
1432 else if (opt->code == OPT_A)
1434 if (opt->arg[0] == '-')
1435 cpp_unassert (parse_in, opt->arg + 1);
1437 cpp_assert (parse_in, opt->arg);
1441 /* Handle -imacros after -D and -U. */
1442 for (i = 0; i < deferred_count; i++)
1444 struct deferred_opt *opt = &deferred_opts[i];
1446 if (opt->code == OPT_imacros
1447 && cpp_push_include (parse_in, opt->arg))
1449 /* Disable push_command_line_include callback for now. */
1450 include_cursor = deferred_count + 1;
1451 cpp_scan_nooutput (parse_in);
1457 push_command_line_include ();
1460 /* Give CPP the next file given by -include, if any. */
1462 push_command_line_include (void)
1464 while (include_cursor < deferred_count)
1466 struct deferred_opt *opt = &deferred_opts[include_cursor++];
1468 if (! cpp_opts->preprocessed && opt->code == OPT_include
1469 && cpp_push_include (parse_in, opt->arg))
1473 if (include_cursor == deferred_count)
1476 /* -Wunused-macros should only warn about macros defined hereafter. */
1477 cpp_opts->warn_unused_macros = warn_unused_macros;
1478 /* Restore the line map from <command line>. */
1479 if (! cpp_opts->preprocessed)
1480 cpp_change_file (parse_in, LC_RENAME, main_input_filename);
1482 /* Set this here so the client can change the option if it wishes,
1483 and after stacking the main file so we don't trace the main file. */
1484 line_table.trace_includes = cpp_opts->print_include_names;
1488 /* File change callback. Has to handle -include files. */
1490 cb_file_change (cpp_reader *pfile ATTRIBUTE_UNUSED,
1491 const struct line_map *new_map)
1493 if (flag_preprocess_only)
1494 pp_file_change (new_map);
1496 fe_file_change (new_map);
1498 if (new_map == 0 || (new_map->reason == LC_LEAVE && MAIN_FILE_P (new_map)))
1499 push_command_line_include ();
1503 cb_dir_change (cpp_reader *pfile ATTRIBUTE_UNUSED, const char *dir)
1505 if (! set_src_pwd (dir))
1506 warning ("too late for # directive to set debug directory");
1509 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1510 extensions if ISO). There is no concept of gnu94. */
1512 set_std_c89 (int c94, int iso)
1514 cpp_set_lang (parse_in, c94 ? CLK_STDC94: iso ? CLK_STDC89: CLK_GNUC89);
1517 flag_no_gnu_keywords = iso;
1518 flag_no_nonansi_builtin = iso;
1523 /* Set the C 99 standard (without GNU extensions if ISO). */
1525 set_std_c99 (int iso)
1527 cpp_set_lang (parse_in, iso ? CLK_STDC99: CLK_GNUC99);
1529 flag_no_nonansi_builtin = iso;
1535 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1537 set_std_cxx98 (int iso)
1539 cpp_set_lang (parse_in, iso ? CLK_CXX98: CLK_GNUCXX);
1540 flag_no_gnu_keywords = iso;
1541 flag_no_nonansi_builtin = iso;
1545 /* Handle setting implicit to ON. */
1547 set_Wimplicit (int on)
1550 warn_implicit_int = on;
1553 if (mesg_implicit_function_declaration != 2)
1554 mesg_implicit_function_declaration = 1;
1557 mesg_implicit_function_declaration = 0;
1560 /* Args to -d specify what to dump. Silently ignore
1561 unrecognized options; they may be aimed at toplev.c. */
1563 handle_OPT_d (const char *arg)
1567 while ((c = *arg++) != '\0')
1570 case 'M': /* Dump macros only. */
1571 case 'N': /* Dump names. */
1572 case 'D': /* Dump definitions. */
1573 flag_dump_macros = c;
1577 flag_dump_includes = 1;