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
49 static int saved_lineno;
52 static cpp_options *cpp_opts;
55 static const char *this_input_filename;
57 /* Filename and stream for preprocessed output. */
58 static const char *out_fname;
59 static FILE *out_stream;
61 /* Append dependencies to deps_file. */
62 static bool deps_append;
64 /* If dependency switches (-MF etc.) have been given. */
65 static bool deps_seen;
70 /* Dependency output file. */
71 static const char *deps_file;
73 /* The prefix given by -iprefix, if any. */
74 static const char *iprefix;
76 /* The system root, if any. Overridden by -isysroot. */
77 static const char *sysroot = TARGET_SYSTEM_ROOT;
79 /* Zero disables all standard directories for headers. */
80 static bool std_inc = true;
82 /* Zero disables the C++-specific standard directories for headers. */
83 static bool std_cxx_inc = true;
85 /* If the quote chain has been split by -I-. */
86 static bool quote_chain_split;
88 /* If -Wunused-macros. */
89 static bool warn_unused_macros;
91 /* Number of deferred options. */
92 static size_t deferred_count;
94 /* Number of deferred options scanned for -include. */
95 static size_t include_cursor;
97 /* Permit Fotran front-end options. */
98 static bool permit_fortran_options;
100 static void set_Wimplicit (int);
101 static void handle_OPT_d (const char *);
102 static void set_std_cxx98 (int);
103 static void set_std_c89 (int, int);
104 static void set_std_c99 (int);
105 static void check_deps_environment_vars (void);
106 static void handle_deferred_opts (void);
107 static void sanitize_cpp_opts (void);
108 static void add_prefixed_path (const char *, size_t);
109 static void push_command_line_include (void);
110 static void cb_file_change (cpp_reader *, const struct line_map *);
111 static void cb_dir_change (cpp_reader *, const char *);
112 static void finish_options (void);
114 #ifndef STDC_0_IN_SYSTEM_HEADERS
115 #define STDC_0_IN_SYSTEM_HEADERS 0
118 /* Holds switches parsed by c_common_handle_option (), but whose
119 handling is deferred to c_common_post_options (). */
120 static void defer_opt (enum opt_code, const char *);
121 static struct deferred_opt
127 /* Complain that switch CODE expects an argument but none was
128 provided. OPT was the command-line option. Return FALSE to get
129 the default message in opts.c, TRUE if we provide a specialized
132 c_common_missing_argument (const char *opt, size_t code)
137 /* Pick up the default message. */
140 case OPT_fconstant_string_class_:
141 error ("no class name specified with \"%s\"", opt);
145 error ("assertion missing after \"%s\"", opt);
150 error ("macro name missing after \"%s\"", opt);
157 error ("missing path after \"%s\"", opt);
166 error ("missing filename after \"%s\"", opt);
171 error ("missing makefile target after \"%s\"", opt);
178 /* Defer option CODE with argument ARG. */
180 defer_opt (enum opt_code code, const char *arg)
182 deferred_opts[deferred_count].code = code;
183 deferred_opts[deferred_count].arg = arg;
187 /* Common initialization before parsing options. */
189 c_common_init_options (unsigned int argc, const char **argv ATTRIBUTE_UNUSED)
191 static const unsigned int lang_flags[] = {CL_C, CL_ObjC, CL_CXX, CL_ObjCXX};
194 /* This is conditionalized only because that is the way the front
195 ends used to do it. Maybe this should be unconditional? */
196 if (c_dialect_cxx ())
198 /* By default wrap lines at 80 characters. Is getenv
199 ("COLUMNS") preferable? */
200 diagnostic_line_cutoff (global_dc) = 80;
201 /* By default, emit location information once for every
202 diagnostic message. */
203 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
206 parse_in = cpp_create_reader (c_dialect_cxx () ? CLK_GNUCXX: CLK_GNUC89,
207 ident_hash, &line_table);
209 cpp_opts = cpp_get_options (parse_in);
210 cpp_opts->dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
211 cpp_opts->objc = c_dialect_objc ();
213 /* Reset to avoid warnings on internal definitions. We set it just
214 before passing on command-line options to cpplib. */
215 cpp_opts->warn_dollars = 0;
217 flag_const_strings = c_dialect_cxx ();
218 flag_exceptions = c_dialect_cxx ();
219 warn_pointer_arith = c_dialect_cxx ();
221 deferred_opts = xmalloc (argc * sizeof (struct deferred_opt));
223 result = lang_flags[c_language];
225 /* If potentially preprocessing Fortran we have to accept its front
226 end options since the driver passes most of them through. */
228 if (c_language == clk_c && argc > 2
229 && !strcmp (argv[2], "-traditional-cpp" ))
231 permit_fortran_options = true;
239 /* Handle switch SCODE with argument ARG. VALUE is true, unless no-
240 form of an -f or -W option was given. Returns 0 if the switch was
241 invalid, a negative number to prevent language-independent
242 processing in toplev.c (a hack necessary for the short-term). */
244 c_common_handle_option (size_t scode, const char *arg, int value)
246 const struct cl_option *option = &cl_options[scode];
247 enum opt_code code = (enum opt_code) scode;
253 result = permit_fortran_options;
256 case OPT__output_pch_:
261 defer_opt (code, arg);
265 cpp_opts->discard_comments = 0;
269 cpp_opts->discard_comments = 0;
270 cpp_opts->discard_comments_in_macro_exp = 0;
274 defer_opt (code, arg);
278 flag_preprocess_only = 1;
282 cpp_opts->print_include_names = 1;
286 if (strcmp (arg, "-"))
287 add_path (xstrdup (arg), BRACKET, 0);
290 if (quote_chain_split)
291 error ("-I- specified twice");
292 quote_chain_split = true;
293 split_quote_chain ();
299 /* When doing dependencies with -M or -MM, suppress normal
300 preprocessed output, but still do -dM etc. as software
301 depends on this. Preprocessed output does occur if -MD, -MMD
302 or environment var dependency generation is used. */
303 cpp_opts->deps.style = (code == OPT_M ? DEPS_SYSTEM: DEPS_USER);
305 cpp_opts->inhibit_warnings = 1;
310 cpp_opts->deps.style = (code == OPT_MD ? DEPS_SYSTEM: DEPS_USER);
321 cpp_opts->deps.missing_files = true;
326 cpp_opts->deps.phony_targets = true;
332 defer_opt (code, arg);
336 flag_no_line_commands = 1;
339 case OPT_fworking_directory:
340 flag_working_directory = value;
344 defer_opt (code, arg);
354 set_Wimplicit (value);
355 warn_char_subscripts = value;
356 warn_missing_braces = value;
357 warn_parentheses = value;
358 warn_return_type = value;
359 warn_sequence_point = value; /* Was C only. */
360 if (c_dialect_cxx ())
361 warn_sign_compare = value;
363 warn_strict_aliasing = value;
365 /* Only warn about unknown pragmas that are not in system
367 warn_unknown_pragmas = value;
369 /* We save the value of warn_uninitialized, since if they put
370 -Wuninitialized on the command line, we need to generate a
371 warning about not using it without also specifying -O. */
372 if (warn_uninitialized != 1)
373 warn_uninitialized = (value ? 2 : 0);
375 if (!c_dialect_cxx ())
376 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding
377 can turn it off only if it's not explicit. */
378 warn_main = value * 2;
381 /* C++-specific warnings. */
382 warn_nonvdtor = value;
383 warn_reorder = value;
384 warn_nontemplate_friend = value;
387 cpp_opts->warn_trigraphs = value;
388 cpp_opts->warn_comments = value;
389 cpp_opts->warn_num_sign_change = value;
390 cpp_opts->warn_multichar = value; /* Was C++ only. */
393 case OPT_Wbad_function_cast:
394 warn_bad_function_cast = value;
398 warn_cast_qual = value;
401 case OPT_Wchar_subscripts:
402 warn_char_subscripts = value;
407 cpp_opts->warn_comments = value;
410 case OPT_Wconversion:
411 warn_conversion = value;
414 case OPT_Wctor_dtor_privacy:
415 warn_ctor_dtor_privacy = value;
418 case OPT_Wdeclaration_after_statement:
419 warn_declaration_after_statement = value;
422 case OPT_Wdeprecated:
423 warn_deprecated = value;
424 cpp_opts->warn_deprecated = value;
427 case OPT_Wdiv_by_zero:
428 warn_div_by_zero = value;
435 case OPT_Wendif_labels:
436 cpp_opts->warn_endif_labels = value;
440 cpp_opts->warnings_are_errors = value;
443 case OPT_Werror_implicit_function_declaration:
444 mesg_implicit_function_declaration = 2;
447 case OPT_Wfloat_equal:
448 warn_float_equal = value;
456 set_Wformat (atoi (arg));
459 case OPT_Wformat_extra_args:
460 warn_format_extra_args = value;
463 case OPT_Wformat_nonliteral:
464 warn_format_nonliteral = value;
467 case OPT_Wformat_security:
468 warn_format_security = value;
471 case OPT_Wformat_y2k:
472 warn_format_y2k = value;
475 case OPT_Wformat_zero_length:
476 warn_format_zero_length = value;
480 warn_init_self = value;
484 set_Wimplicit (value);
487 case OPT_Wimplicit_function_declaration:
488 mesg_implicit_function_declaration = value;
491 case OPT_Wimplicit_int:
492 warn_implicit_int = value;
496 /* Silently ignore for now. */
499 case OPT_Winvalid_offsetof:
500 warn_invalid_offsetof = value;
503 case OPT_Winvalid_pch:
504 cpp_opts->warn_invalid_pch = value;
508 warn_long_long = value;
518 case OPT_Wmissing_braces:
519 warn_missing_braces = value;
522 case OPT_Wmissing_declarations:
523 warn_missing_declarations = value;
526 case OPT_Wmissing_format_attribute:
527 warn_missing_format_attribute = value;
530 case OPT_Wmissing_prototypes:
531 warn_missing_prototypes = value;
535 cpp_opts->warn_multichar = value;
538 case OPT_Wnested_externs:
539 warn_nested_externs = value;
542 case OPT_Wnon_template_friend:
543 warn_nontemplate_friend = value;
546 case OPT_Wnon_virtual_dtor:
547 warn_nonvdtor = value;
551 warn_nonnull = value;
554 case OPT_Wold_style_definition:
555 warn_old_style_definition = value;
558 case OPT_Wold_style_cast:
559 warn_old_style_cast = value;
562 case OPT_Woverloaded_virtual:
563 warn_overloaded_virtual = value;
566 case OPT_Wparentheses:
567 warn_parentheses = value;
570 case OPT_Wpmf_conversions:
571 warn_pmf2ptr = value;
574 case OPT_Wpointer_arith:
575 warn_pointer_arith = value;
579 warn_protocol = value;
583 warn_selector = value;
586 case OPT_Wredundant_decls:
587 warn_redundant_decls = value;
591 warn_reorder = value;
594 case OPT_Wreturn_type:
595 warn_return_type = value;
598 case OPT_Wsequence_point:
599 warn_sequence_point = value;
602 case OPT_Wsign_compare:
603 warn_sign_compare = value;
606 case OPT_Wsign_promo:
607 warn_sign_promo = value;
610 case OPT_Wstrict_prototypes:
611 warn_strict_prototypes = value;
618 case OPT_Wsystem_headers:
619 cpp_opts->warn_system_headers = value;
622 case OPT_Wtraditional:
623 warn_traditional = value;
624 cpp_opts->warn_traditional = value;
628 cpp_opts->warn_trigraphs = value;
631 case OPT_Wundeclared_selector:
632 warn_undeclared_selector = value;
636 cpp_opts->warn_undef = value;
639 case OPT_Wunknown_pragmas:
640 /* Set to greater than 1, so that even unknown pragmas in
641 system headers will be warned about. */
642 warn_unknown_pragmas = value * 2;
645 case OPT_Wunused_macros:
646 warn_unused_macros = value;
649 case OPT_Wwrite_strings:
650 if (!c_dialect_cxx ())
651 flag_const_strings = value;
653 warn_write_strings = value;
657 if (!c_dialect_cxx ())
658 set_std_c89 (false, true);
660 set_std_cxx98 (true);
667 case OPT_fcond_mismatch:
668 if (!c_dialect_cxx ())
670 flag_cond_mismatch = value;
675 case OPT_fall_virtual:
676 case OPT_falt_external_templates:
677 case OPT_fenum_int_equiv:
678 case OPT_fexternal_templates:
679 case OPT_fguiding_decls:
681 case OPT_fhuge_objects:
683 case OPT_fname_mangling_version_:
685 case OPT_fnonnull_objects:
687 case OPT_fstrict_prototype:
688 case OPT_fthis_is_variable:
689 case OPT_fvtable_thunks:
692 warning ("switch \"%s\" is no longer supported", option->opt_text);
695 case OPT_fabi_version_:
696 flag_abi_version = value;
699 case OPT_faccess_control:
700 flag_access_control = value;
704 flag_no_asm = !value;
708 flag_no_builtin = !value;
715 disable_builtin_function (arg);
718 case OPT_fdollars_in_identifiers:
719 cpp_opts->dollars_in_ident = value;
723 if (!dump_switch_p (arg))
727 case OPT_ffreestanding:
729 /* Fall through.... */
732 flag_no_builtin = !value;
733 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
734 if (!value && warn_main == 2)
738 case OPT_fshort_double:
739 flag_short_double = value;
742 case OPT_fshort_enums:
743 flag_short_enums = value;
746 case OPT_fshort_wchar:
747 flag_short_wchar = value;
750 case OPT_fsigned_bitfields:
751 flag_signed_bitfields = value;
752 explicit_flag_signed_bitfields = 1;
755 case OPT_fsigned_char:
756 flag_signed_char = value;
759 case OPT_funsigned_bitfields:
760 flag_signed_bitfields = !value;
761 explicit_flag_signed_bitfields = 1;
764 case OPT_funsigned_char:
765 flag_signed_char = !value;
769 flag_check_new = value;
772 case OPT_fconserve_space:
773 flag_conserve_space = value;
776 case OPT_fconst_strings:
777 flag_const_strings = value;
780 case OPT_fconstant_string_class_:
781 constant_string_class_name = arg;
784 case OPT_fdefault_inline:
785 flag_default_inline = value;
788 case OPT_felide_constructors:
789 flag_elide_constructors = value;
792 case OPT_fenforce_eh_specs:
793 flag_enforce_eh_specs = value;
796 case OPT_ffixed_form:
797 case OPT_ffixed_line_length_:
798 /* Fortran front end options ignored when preprocessing only. */
799 if (!flag_preprocess_only)
804 flag_new_for_scope = value;
807 case OPT_fgnu_keywords:
808 flag_no_gnu_keywords = !value;
811 case OPT_fgnu_runtime:
812 flag_next_runtime = !value;
815 case OPT_fhandle_exceptions:
816 warning ("-fhandle-exceptions has been renamed -fexceptions (and is now on by default)");
817 flag_exceptions = value;
820 case OPT_fimplement_inlines:
821 flag_implement_inlines = value;
824 case OPT_fimplicit_inline_templates:
825 flag_implicit_inline_templates = value;
828 case OPT_fimplicit_templates:
829 flag_implicit_templates = value;
832 case OPT_fms_extensions:
833 flag_ms_extensions = value;
836 case OPT_fnext_runtime:
837 flag_next_runtime = value;
840 case OPT_fnil_receivers:
841 flag_nil_receivers = value;
844 case OPT_fnonansi_builtins:
845 flag_no_nonansi_builtin = !value;
848 case OPT_fobjc_exceptions:
849 flag_objc_exceptions = value;
852 case OPT_foperator_names:
853 cpp_opts->operator_names = value;
856 case OPT_foptional_diags:
857 flag_optional_diags = value;
861 cpp_opts->restore_pch_deps = value;
864 case OPT_fpermissive:
865 flag_permissive = value;
868 case OPT_fpreprocessed:
869 cpp_opts->preprocessed = value;
872 case OPT_freplace_objc_classes:
873 flag_replace_objc_classes = value;
877 flag_use_repository = value;
879 flag_implicit_templates = 0;
886 case OPT_fshow_column:
887 cpp_opts->show_column = value;
891 flag_detailed_statistics = value;
895 /* It is documented that we silently ignore silly values. */
896 if (value >= 1 && value <= 100)
897 cpp_opts->tabstop = value;
900 case OPT_fexec_charset_:
901 cpp_opts->narrow_charset = arg;
904 case OPT_fwide_exec_charset_:
905 cpp_opts->wide_charset = arg;
908 case OPT_finput_charset_:
909 cpp_opts->input_charset = arg;
912 case OPT_ftemplate_depth_:
913 max_tinst_depth = value;
916 case OPT_fuse_cxa_atexit:
917 flag_use_cxa_atexit = value;
925 flag_zero_link = value;
929 flag_gen_declaration = 1;
933 add_path (xstrdup (arg), AFTER, 0);
938 defer_opt (code, arg);
950 add_path (xstrdup (arg), SYSTEM, 0);
953 case OPT_iwithprefix:
954 add_prefixed_path (arg, SYSTEM);
957 case OPT_iwithprefixbefore:
958 add_prefixed_path (arg, BRACKET);
962 cpp_set_lang (parse_in, CLK_ASM);
963 cpp_opts->dollars_in_ident = false;
982 error ("output filename specified twice");
985 /* We need to handle the -pedantic switches here, rather than in
986 c_common_post_options, so that a subsequent -Wno-endif-labels
987 is not overridden. */
988 case OPT_pedantic_errors:
989 cpp_opts->pedantic_errors = 1;
992 cpp_opts->pedantic = 1;
993 cpp_opts->warn_endif_labels = 1;
996 case OPT_print_objc_runtime_info:
997 print_struct_values = 1;
1001 cpp_opts->remap = 1;
1005 case OPT_std_gnu__98:
1006 set_std_cxx98 (code == OPT_std_c__98 /* ISO */);
1010 case OPT_std_iso9899_1990:
1011 case OPT_std_iso9899_199409:
1012 set_std_c89 (code == OPT_std_iso9899_199409 /* c94 */, true /* ISO */);
1016 set_std_c89 (false /* c94 */, false /* ISO */);
1021 case OPT_std_iso9899_1999:
1022 case OPT_std_iso9899_199x:
1023 set_std_c99 (true /* ISO */);
1028 set_std_c99 (false /* ISO */);
1032 cpp_opts->trigraphs = 1;
1035 case OPT_traditional_cpp:
1036 cpp_opts->traditional = 1;
1044 cpp_opts->inhibit_warnings = 1;
1055 /* Post-switch processing. */
1057 c_common_post_options (const char **pfilename)
1059 struct cpp_callbacks *cb;
1061 /* Canonicalize the input and output filenames. */
1062 if (in_fnames == NULL)
1064 in_fnames = xmalloc (sizeof (in_fnames[0]));
1067 else if (strcmp (in_fnames[0], "-") == 0)
1070 if (out_fname == NULL || !strcmp (out_fname, "-"))
1073 if (cpp_opts->deps.style == DEPS_NONE)
1074 check_deps_environment_vars ();
1076 handle_deferred_opts ();
1078 sanitize_cpp_opts ();
1080 register_include_chains (parse_in, sysroot, iprefix,
1081 std_inc, std_cxx_inc && c_dialect_cxx (), verbose);
1083 flag_inline_trees = 1;
1085 /* Use tree inlining if possible. Function instrumentation is only
1086 done in the RTL level, so we disable tree inlining. */
1087 if (! flag_instrument_function_entry_exit)
1089 if (!flag_no_inline)
1091 if (flag_inline_functions)
1093 flag_inline_trees = 2;
1094 flag_inline_functions = 0;
1098 /* -Wextra implies -Wsign-compare, but not if explicitly
1100 if (warn_sign_compare == -1)
1101 warn_sign_compare = extra_warnings;
1103 /* Special format checking options don't work without -Wformat; warn if
1105 if (warn_format_y2k && !warn_format)
1106 warning ("-Wformat-y2k ignored without -Wformat");
1107 if (warn_format_extra_args && !warn_format)
1108 warning ("-Wformat-extra-args ignored without -Wformat");
1109 if (warn_format_zero_length && !warn_format)
1110 warning ("-Wformat-zero-length ignored without -Wformat");
1111 if (warn_format_nonliteral && !warn_format)
1112 warning ("-Wformat-nonliteral ignored without -Wformat");
1113 if (warn_format_security && !warn_format)
1114 warning ("-Wformat-security ignored without -Wformat");
1115 if (warn_missing_format_attribute && !warn_format)
1116 warning ("-Wmissing-format-attribute ignored without -Wformat");
1118 if (flag_preprocess_only)
1120 /* Open the output now. We must do so even if flag_no_output is
1121 on, because there may be other output than from the actual
1122 preprocessing (e.g. from -dM). */
1123 if (out_fname[0] == '\0')
1124 out_stream = stdout;
1126 out_stream = fopen (out_fname, "w");
1128 if (out_stream == NULL)
1130 fatal_error ("opening output file %s: %m", out_fname);
1134 if (num_in_fnames > 1)
1135 error ("too many filenames given. Type %s --help for usage",
1138 init_pp_output (out_stream);
1144 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1148 cb = cpp_get_callbacks (parse_in);
1149 cb->file_change = cb_file_change;
1150 cb->dir_change = cb_dir_change;
1151 cpp_post_options (parse_in);
1153 saved_lineno = input_line;
1156 /* If an error has occurred in cpplib, note it so we fail
1158 errorcount += cpp_errors (parse_in);
1160 *pfilename = this_input_filename
1161 = cpp_read_main_file (parse_in, in_fnames[0]);
1162 if (this_input_filename == NULL)
1165 if (flag_working_directory
1166 && flag_preprocess_only && ! flag_no_line_commands)
1167 pp_dir_change (parse_in, get_src_pwd ());
1169 return flag_preprocess_only;
1172 /* Front end initialization common to C, ObjC and C++. */
1174 c_common_init (void)
1176 input_line = saved_lineno;
1178 /* Set up preprocessor arithmetic. Must be done after call to
1179 c_common_nodes_and_builtins for type nodes to be good. */
1180 cpp_opts->precision = TYPE_PRECISION (intmax_type_node);
1181 cpp_opts->char_precision = TYPE_PRECISION (char_type_node);
1182 cpp_opts->int_precision = TYPE_PRECISION (integer_type_node);
1183 cpp_opts->wchar_precision = TYPE_PRECISION (wchar_type_node);
1184 cpp_opts->unsigned_wchar = TREE_UNSIGNED (wchar_type_node);
1185 cpp_opts->bytes_big_endian = BYTES_BIG_ENDIAN;
1187 /* This can't happen until after wchar_precision and bytes_big_endian
1189 cpp_init_iconv (parse_in);
1191 if (flag_preprocess_only)
1194 preprocess_file (parse_in);
1198 /* Has to wait until now so that cpplib has its hash table. */
1204 /* Initialize the integrated preprocessor after debug output has been
1205 initialized; loop over each input file. */
1207 c_common_parse_file (int set_yydebug ATTRIBUTE_UNUSED)
1209 unsigned file_index;
1212 yydebug = set_yydebug;
1214 warning ("YYDEBUG not defined");
1223 /* Reset the state of the parser. */
1226 /* Reset cpplib's macros and start a new file. */
1227 cpp_undef_all (parse_in);
1228 main_input_filename = this_input_filename
1229 = cpp_read_main_file (parse_in, in_fnames[file_index]);
1230 if (this_input_filename == NULL)
1234 if (file_index == 0)
1239 } while (file_index < num_in_fnames);
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 /* If we're generating preprocessor output, emit current directory
1368 if explicitly requested or if debugging information is enabled.
1369 ??? Maybe we should only do it for debugging formats that
1370 actually output the current directory? */
1371 if (flag_working_directory == -1)
1372 flag_working_directory = (debug_info_level != DINFO_LEVEL_NONE);
1375 /* Add include path with a prefix at the front of its name. */
1377 add_prefixed_path (const char *suffix, size_t chain)
1381 size_t prefix_len, suffix_len;
1383 suffix_len = strlen (suffix);
1384 prefix = iprefix ? iprefix : cpp_GCC_INCLUDE_DIR;
1385 prefix_len = iprefix ? strlen (iprefix) : cpp_GCC_INCLUDE_DIR_len;
1387 path = xmalloc (prefix_len + suffix_len + 1);
1388 memcpy (path, prefix, prefix_len);
1389 memcpy (path + prefix_len, suffix, suffix_len);
1390 path[prefix_len + suffix_len] = '\0';
1392 add_path (path, chain, 0);
1395 /* Handle -D, -U, -A, -imacros, and the first -include. */
1397 finish_options (void)
1399 if (!cpp_opts->preprocessed)
1403 cpp_change_file (parse_in, LC_RENAME, _("<built-in>"));
1404 cpp_init_builtins (parse_in, flag_hosted);
1405 c_cpp_builtins (parse_in);
1407 /* We're about to send user input to cpplib, so make it warn for
1408 things that we previously (when we sent it internal definitions)
1409 told it to not warn.
1411 C99 permits implementation-defined characters in identifiers.
1412 The documented meaning of -std= is to turn off extensions that
1413 conflict with the specified standard, and since a strictly
1414 conforming program cannot contain a '$', we do not condition
1415 their acceptance on the -std= setting. */
1416 cpp_opts->warn_dollars = (cpp_opts->pedantic && !cpp_opts->c99);
1418 cpp_change_file (parse_in, LC_RENAME, _("<command line>"));
1419 for (i = 0; i < deferred_count; i++)
1421 struct deferred_opt *opt = &deferred_opts[i];
1423 if (opt->code == OPT_D)
1424 cpp_define (parse_in, opt->arg);
1425 else if (opt->code == OPT_U)
1426 cpp_undef (parse_in, opt->arg);
1427 else if (opt->code == OPT_A)
1429 if (opt->arg[0] == '-')
1430 cpp_unassert (parse_in, opt->arg + 1);
1432 cpp_assert (parse_in, opt->arg);
1436 /* Handle -imacros after -D and -U. */
1437 for (i = 0; i < deferred_count; i++)
1439 struct deferred_opt *opt = &deferred_opts[i];
1441 if (opt->code == OPT_imacros
1442 && cpp_push_include (parse_in, opt->arg))
1444 /* Disable push_command_line_include callback for now. */
1445 include_cursor = deferred_count + 1;
1446 cpp_scan_nooutput (parse_in);
1452 push_command_line_include ();
1455 /* Give CPP the next file given by -include, if any. */
1457 push_command_line_include (void)
1459 while (include_cursor < deferred_count)
1461 struct deferred_opt *opt = &deferred_opts[include_cursor++];
1463 if (! cpp_opts->preprocessed && opt->code == OPT_include
1464 && cpp_push_include (parse_in, opt->arg))
1468 if (include_cursor == deferred_count)
1471 /* -Wunused-macros should only warn about macros defined hereafter. */
1472 cpp_opts->warn_unused_macros = warn_unused_macros;
1473 /* Restore the line map from <command line>. */
1474 if (! cpp_opts->preprocessed)
1475 cpp_change_file (parse_in, LC_RENAME, main_input_filename);
1477 /* Set this here so the client can change the option if it wishes,
1478 and after stacking the main file so we don't trace the main file. */
1479 line_table.trace_includes = cpp_opts->print_include_names;
1483 /* File change callback. Has to handle -include files. */
1485 cb_file_change (cpp_reader *pfile ATTRIBUTE_UNUSED,
1486 const struct line_map *new_map)
1488 if (flag_preprocess_only)
1489 pp_file_change (new_map);
1491 fe_file_change (new_map);
1493 if (new_map == 0 || (new_map->reason == LC_LEAVE && MAIN_FILE_P (new_map)))
1494 push_command_line_include ();
1498 cb_dir_change (cpp_reader *pfile ATTRIBUTE_UNUSED, const char *dir)
1500 if (! set_src_pwd (dir))
1501 warning ("too late for # directive to set debug directory");
1504 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1505 extensions if ISO). There is no concept of gnu94. */
1507 set_std_c89 (int c94, int iso)
1509 cpp_set_lang (parse_in, c94 ? CLK_STDC94: iso ? CLK_STDC89: CLK_GNUC89);
1512 flag_no_gnu_keywords = iso;
1513 flag_no_nonansi_builtin = iso;
1516 flag_writable_strings = 0;
1519 /* Set the C 99 standard (without GNU extensions if ISO). */
1521 set_std_c99 (int iso)
1523 cpp_set_lang (parse_in, iso ? CLK_STDC99: CLK_GNUC99);
1525 flag_no_nonansi_builtin = iso;
1529 flag_writable_strings = 0;
1532 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1534 set_std_cxx98 (int iso)
1536 cpp_set_lang (parse_in, iso ? CLK_CXX98: CLK_GNUCXX);
1537 flag_no_gnu_keywords = iso;
1538 flag_no_nonansi_builtin = iso;
1542 /* Handle setting implicit to ON. */
1544 set_Wimplicit (int on)
1547 warn_implicit_int = on;
1550 if (mesg_implicit_function_declaration != 2)
1551 mesg_implicit_function_declaration = 1;
1554 mesg_implicit_function_declaration = 0;
1557 /* Args to -d specify what to dump. Silently ignore
1558 unrecognized options; they may be aimed at toplev.c. */
1560 handle_OPT_d (const char *arg)
1564 while ((c = *arg++) != '\0')
1567 case 'M': /* Dump macros only. */
1568 case 'N': /* Dump names. */
1569 case 'D': /* Dump definitions. */
1570 flag_dump_macros = c;
1574 flag_dump_includes = 1;