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 system root, if any. Overridden by -isysroot. */
83 static const char *sysroot = TARGET_SYSTEM_ROOT;
85 /* Zero disables all standard directories for headers. */
86 static bool std_inc = true;
88 /* Zero disables the C++-specific standard directories for headers. */
89 static bool std_cxx_inc = true;
91 /* If the quote chain has been split by -I-. */
92 static bool quote_chain_split;
94 /* If -Wunused-macros. */
95 static bool warn_unused_macros;
97 /* If -Wvariadic-macros. */
98 static bool warn_variadic_macros = true;
100 /* Number of deferred options. */
101 static size_t deferred_count;
103 /* Number of deferred options scanned for -include. */
104 static size_t include_cursor;
106 static void set_Wimplicit (int);
107 static void handle_OPT_d (const char *);
108 static void set_std_cxx98 (int);
109 static void set_std_c89 (int, int);
110 static void set_std_c99 (int);
111 static void check_deps_environment_vars (void);
112 static void handle_deferred_opts (void);
113 static void sanitize_cpp_opts (void);
114 static void add_prefixed_path (const char *, size_t);
115 static void push_command_line_include (void);
116 static void cb_file_change (cpp_reader *, const struct line_map *);
117 static void cb_dir_change (cpp_reader *, const char *);
118 static void finish_options (void);
120 #ifndef STDC_0_IN_SYSTEM_HEADERS
121 #define STDC_0_IN_SYSTEM_HEADERS 0
124 /* Holds switches parsed by c_common_handle_option (), but whose
125 handling is deferred to c_common_post_options (). */
126 static void defer_opt (enum opt_code, const char *);
127 static struct deferred_opt
133 /* Complain that switch CODE expects an argument but none was
134 provided. OPT was the command-line option. Return FALSE to get
135 the default message in opts.c, TRUE if we provide a specialized
138 c_common_missing_argument (const char *opt, size_t code)
143 /* Pick up the default message. */
146 case OPT_fconstant_string_class_:
147 error ("no class name specified with %qs", opt);
151 error ("assertion missing after %qs", opt);
156 error ("macro name missing after %qs", opt);
165 error ("missing path after %qs", opt);
174 error ("missing filename after %qs", opt);
179 error ("missing makefile target after %qs", opt);
186 /* Defer option CODE with argument ARG. */
188 defer_opt (enum opt_code code, const char *arg)
190 deferred_opts[deferred_count].code = code;
191 deferred_opts[deferred_count].arg = arg;
195 /* Common initialization before parsing options. */
197 c_common_init_options (unsigned int argc, const char **argv)
199 static const unsigned int lang_flags[] = {CL_C, CL_ObjC, CL_CXX, CL_ObjCXX};
200 unsigned int i, result;
202 /* This is conditionalized only because that is the way the front
203 ends used to do it. Maybe this should be unconditional? */
204 if (c_dialect_cxx ())
206 /* By default wrap lines at 80 characters. Is getenv
207 ("COLUMNS") preferable? */
208 diagnostic_line_cutoff (global_dc) = 80;
209 /* By default, emit location information once for every
210 diagnostic message. */
211 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
214 parse_in = cpp_create_reader (c_dialect_cxx () ? CLK_GNUCXX: CLK_GNUC89,
215 ident_hash, &line_table);
217 cpp_opts = cpp_get_options (parse_in);
218 cpp_opts->dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
219 cpp_opts->objc = c_dialect_objc ();
221 /* Reset to avoid warnings on internal definitions. We set it just
222 before passing on command-line options to cpplib. */
223 cpp_opts->warn_dollars = 0;
225 flag_const_strings = c_dialect_cxx ();
226 flag_exceptions = c_dialect_cxx ();
227 warn_pointer_arith = c_dialect_cxx ();
229 deferred_opts = XNEWVEC (struct deferred_opt, argc);
231 result = lang_flags[c_language];
233 if (c_language == clk_c)
235 /* If preprocessing assembly language, accept any of the C-family
236 front end options since the driver may pass them through. */
237 for (i = 1; i < argc; i++)
238 if (! strcmp (argv[i], "-lang-asm"))
240 result |= CL_C | CL_ObjC | CL_CXX | CL_ObjCXX;
245 for (i = 1; i < argc; i++)
246 if (! strcmp (argv[i], "-lang-fortran"))
248 result |= CL_Fortran;
257 /* Handle switch SCODE with argument ARG. VALUE is true, unless no-
258 form of an -f or -W option was given. Returns 0 if the switch was
259 invalid, a negative number to prevent language-independent
260 processing in toplev.c (a hack necessary for the short-term). */
262 c_common_handle_option (size_t scode, const char *arg, int value)
264 const struct cl_option *option = &cl_options[scode];
265 enum opt_code code = (enum opt_code) scode;
271 if (cl_options[code].flags & (CL_C | CL_CXX | CL_ObjC | CL_ObjCXX))
274 if (lang_fortran && (cl_options[code].flags & (CL_Fortran)))
280 case OPT__output_pch_:
285 defer_opt (code, arg);
289 cpp_opts->discard_comments = 0;
293 cpp_opts->discard_comments = 0;
294 cpp_opts->discard_comments_in_macro_exp = 0;
298 defer_opt (code, arg);
302 flag_preprocess_only = 1;
306 cpp_opts->print_include_names = 1;
310 TARGET_OPTF (xstrdup (arg));
314 if (strcmp (arg, "-"))
315 add_path (xstrdup (arg), BRACKET, 0, true);
318 if (quote_chain_split)
319 error ("-I- specified twice");
320 quote_chain_split = true;
321 split_quote_chain ();
322 inform ("obsolete option -I- used, please use -iquote instead");
328 /* When doing dependencies with -M or -MM, suppress normal
329 preprocessed output, but still do -dM etc. as software
330 depends on this. Preprocessed output does occur if -MD, -MMD
331 or environment var dependency generation is used. */
332 cpp_opts->deps.style = (code == OPT_M ? DEPS_SYSTEM: DEPS_USER);
334 cpp_opts->inhibit_warnings = 1;
339 cpp_opts->deps.style = (code == OPT_MD ? DEPS_SYSTEM: DEPS_USER);
350 cpp_opts->deps.missing_files = true;
355 cpp_opts->deps.phony_targets = true;
361 defer_opt (code, arg);
365 flag_no_line_commands = 1;
368 case OPT_fworking_directory:
369 flag_working_directory = value;
373 defer_opt (code, arg);
379 set_Wimplicit (value);
380 warn_char_subscripts = value;
381 warn_missing_braces = value;
382 warn_parentheses = value;
383 warn_return_type = value;
384 warn_sequence_point = value; /* Was C only. */
385 if (c_dialect_cxx ())
386 warn_sign_compare = value;
388 warn_strict_aliasing = value;
390 /* Only warn about unknown pragmas that are not in system
392 warn_unknown_pragmas = value;
394 /* We save the value of warn_uninitialized, since if they put
395 -Wuninitialized on the command line, we need to generate a
396 warning about not using it without also specifying -O. */
397 if (warn_uninitialized != 1)
398 warn_uninitialized = (value ? 2 : 0);
400 if (!c_dialect_cxx ())
401 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding
402 can turn it off only if it's not explicit. */
403 warn_main = value * 2;
406 /* C++-specific warnings. */
407 warn_nonvdtor = value;
408 warn_reorder = value;
409 warn_nontemplate_friend = value;
412 cpp_opts->warn_trigraphs = value;
413 cpp_opts->warn_comments = value;
414 cpp_opts->warn_num_sign_change = value;
415 cpp_opts->warn_multichar = value; /* Was C++ only. */
417 if (warn_pointer_sign == -1)
418 warn_pointer_sign = 1;
423 cpp_opts->warn_comments = value;
426 case OPT_Wdeprecated:
427 cpp_opts->warn_deprecated = value;
430 case OPT_Wdiv_by_zero:
431 warn_div_by_zero = value;
434 case OPT_Wendif_labels:
435 cpp_opts->warn_endif_labels = value;
439 cpp_opts->warnings_are_errors = value;
440 global_dc->warning_as_error_requested = value;
443 case OPT_Werror_implicit_function_declaration:
444 mesg_implicit_function_declaration = 2;
452 set_Wformat (atoi (arg));
456 set_Wimplicit (value);
460 /* Silently ignore for now. */
463 case OPT_Winvalid_pch:
464 cpp_opts->warn_invalid_pch = value;
474 case OPT_Wmissing_include_dirs:
475 cpp_opts->warn_missing_include_dirs = value;
479 cpp_opts->warn_multichar = value;
482 case OPT_Wnormalized_:
483 if (!value || (arg && strcasecmp (arg, "none") == 0))
484 cpp_opts->warn_normalize = normalized_none;
485 else if (!arg || strcasecmp (arg, "nfkc") == 0)
486 cpp_opts->warn_normalize = normalized_KC;
487 else if (strcasecmp (arg, "id") == 0)
488 cpp_opts->warn_normalize = normalized_identifier_C;
489 else if (strcasecmp (arg, "nfc") == 0)
490 cpp_opts->warn_normalize = normalized_C;
492 error ("argument %qs to %<-Wnormalized%> not recognized", arg);
495 case OPT_Wreturn_type:
496 warn_return_type = value;
499 case OPT_Wstrict_null_sentinel:
500 warn_strict_null_sentinel = value;
503 case OPT_Wsystem_headers:
504 cpp_opts->warn_system_headers = value;
507 case OPT_Wtraditional:
508 cpp_opts->warn_traditional = value;
512 cpp_opts->warn_trigraphs = value;
516 cpp_opts->warn_undef = value;
519 case OPT_Wunknown_pragmas:
520 /* Set to greater than 1, so that even unknown pragmas in
521 system headers will be warned about. */
522 warn_unknown_pragmas = value * 2;
525 case OPT_Wunused_macros:
526 warn_unused_macros = value;
529 case OPT_Wvariadic_macros:
530 warn_variadic_macros = value;
533 case OPT_Wwrite_strings:
534 if (!c_dialect_cxx ())
535 flag_const_strings = value;
537 warn_write_strings = value;
541 if (!c_dialect_cxx ())
542 set_std_c89 (false, true);
544 set_std_cxx98 (true);
551 case OPT_fcond_mismatch:
552 if (!c_dialect_cxx ())
554 flag_cond_mismatch = value;
559 case OPT_fall_virtual:
560 case OPT_falt_external_templates:
561 case OPT_fenum_int_equiv:
562 case OPT_fexternal_templates:
563 case OPT_fguiding_decls:
565 case OPT_fhuge_objects:
567 case OPT_fname_mangling_version_:
569 case OPT_fnonnull_objects:
571 case OPT_fstrict_prototype:
572 case OPT_fthis_is_variable:
573 case OPT_fvtable_thunks:
576 warning (0, "switch %qs is no longer supported", option->opt_text);
579 case OPT_faccess_control:
580 flag_access_control = value;
584 flag_no_asm = !value;
588 flag_no_builtin = !value;
595 disable_builtin_function (arg);
598 case OPT_fdollars_in_identifiers:
599 cpp_opts->dollars_in_ident = value;
602 case OPT_ffreestanding:
604 /* Fall through.... */
607 flag_no_builtin = !value;
608 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
609 if (!value && warn_main == 2)
613 case OPT_fshort_double:
614 flag_short_double = value;
617 case OPT_fshort_enums:
618 flag_short_enums = value;
621 case OPT_fshort_wchar:
622 flag_short_wchar = value;
625 case OPT_fsigned_bitfields:
626 flag_signed_bitfields = value;
629 case OPT_fsigned_char:
630 flag_signed_char = value;
633 case OPT_funsigned_bitfields:
634 flag_signed_bitfields = !value;
637 case OPT_funsigned_char:
638 flag_signed_char = !value;
642 flag_check_new = value;
645 case OPT_fconserve_space:
646 flag_conserve_space = value;
649 case OPT_fconst_strings:
650 flag_const_strings = value;
653 case OPT_fconstant_string_class_:
654 constant_string_class_name = arg;
657 case OPT_fdefault_inline:
658 flag_default_inline = value;
661 case OPT_felide_constructors:
662 flag_elide_constructors = value;
665 case OPT_fenforce_eh_specs:
666 flag_enforce_eh_specs = value;
669 case OPT_fextended_identifiers:
670 cpp_opts->extended_identifiers = value;
674 flag_new_for_scope = value;
677 case OPT_fgnu_keywords:
678 flag_no_gnu_keywords = !value;
681 case OPT_fgnu_runtime:
682 flag_next_runtime = !value;
685 case OPT_fhandle_exceptions:
686 warning (0, "-fhandle-exceptions has been renamed -fexceptions (and is now on by default)");
687 flag_exceptions = value;
690 case OPT_fimplement_inlines:
691 flag_implement_inlines = value;
694 case OPT_fimplicit_inline_templates:
695 flag_implicit_inline_templates = value;
698 case OPT_fimplicit_templates:
699 flag_implicit_templates = value;
702 case OPT_fms_extensions:
703 flag_ms_extensions = value;
706 case OPT_fnext_runtime:
707 flag_next_runtime = value;
710 case OPT_fnil_receivers:
711 flag_nil_receivers = value;
714 case OPT_fnonansi_builtins:
715 flag_no_nonansi_builtin = !value;
718 case OPT_foperator_names:
719 cpp_opts->operator_names = value;
722 case OPT_foptional_diags:
723 flag_optional_diags = value;
727 cpp_opts->restore_pch_deps = value;
730 case OPT_fpch_preprocess:
731 flag_pch_preprocess = value;
734 case OPT_fpermissive:
735 flag_permissive = value;
738 case OPT_fpreprocessed:
739 cpp_opts->preprocessed = value;
742 case OPT_freplace_objc_classes:
743 flag_replace_objc_classes = value;
747 flag_use_repository = value;
749 flag_implicit_templates = 0;
756 case OPT_fshow_column:
757 cpp_opts->show_column = value;
761 flag_detailed_statistics = value;
765 /* It is documented that we silently ignore silly values. */
766 if (value >= 1 && value <= 100)
767 cpp_opts->tabstop = value;
770 case OPT_fexec_charset_:
771 cpp_opts->narrow_charset = arg;
774 case OPT_fwide_exec_charset_:
775 cpp_opts->wide_charset = arg;
778 case OPT_finput_charset_:
779 cpp_opts->input_charset = arg;
782 case OPT_ftemplate_depth_:
783 max_tinst_depth = value;
786 case OPT_fuse_cxa_atexit:
787 flag_use_cxa_atexit = value;
790 case OPT_fvisibility_inlines_hidden:
791 visibility_options.inlines_hidden = value;
798 case OPT_fthreadsafe_statics:
799 flag_threadsafe_statics = value;
803 flag_zero_link = value;
807 flag_gen_declaration = 1;
811 add_path (xstrdup (arg), AFTER, 0, true);
816 defer_opt (code, arg);
824 add_path (xstrdup (arg), QUOTE, 0, true);
832 add_path (xstrdup (arg), SYSTEM, 0, true);
835 case OPT_iwithprefix:
836 add_prefixed_path (arg, SYSTEM);
839 case OPT_iwithprefixbefore:
840 add_prefixed_path (arg, BRACKET);
844 cpp_set_lang (parse_in, CLK_ASM);
845 cpp_opts->dollars_in_ident = false;
848 case OPT_lang_fortran:
868 error ("output filename specified twice");
871 /* We need to handle the -pedantic switches here, rather than in
872 c_common_post_options, so that a subsequent -Wno-endif-labels
873 is not overridden. */
874 case OPT_pedantic_errors:
875 cpp_opts->pedantic_errors = 1;
878 cpp_opts->pedantic = 1;
879 cpp_opts->warn_endif_labels = 1;
880 if (warn_pointer_sign == -1)
881 warn_pointer_sign = 1;
884 case OPT_print_objc_runtime_info:
885 print_struct_values = 1;
888 case OPT_print_pch_checksum:
889 c_common_print_pch_checksum (stdout);
890 exit_after_options = true;
898 case OPT_std_gnu__98:
899 set_std_cxx98 (code == OPT_std_c__98 /* ISO */);
903 case OPT_std_iso9899_1990:
904 case OPT_std_iso9899_199409:
905 set_std_c89 (code == OPT_std_iso9899_199409 /* c94 */, true /* ISO */);
909 set_std_c89 (false /* c94 */, false /* ISO */);
914 case OPT_std_iso9899_1999:
915 case OPT_std_iso9899_199x:
916 set_std_c99 (true /* ISO */);
921 set_std_c99 (false /* ISO */);
925 cpp_opts->trigraphs = 1;
928 case OPT_traditional_cpp:
929 cpp_opts->traditional = 1;
937 cpp_opts->inhibit_warnings = 1;
948 /* Post-switch processing. */
950 c_common_post_options (const char **pfilename)
952 struct cpp_callbacks *cb;
954 /* Canonicalize the input and output filenames. */
955 if (in_fnames == NULL)
957 in_fnames = XNEWVEC (const char *, 1);
960 else if (strcmp (in_fnames[0], "-") == 0)
963 if (out_fname == NULL || !strcmp (out_fname, "-"))
966 if (cpp_opts->deps.style == DEPS_NONE)
967 check_deps_environment_vars ();
969 handle_deferred_opts ();
971 sanitize_cpp_opts ();
973 register_include_chains (parse_in, sysroot, iprefix,
974 std_inc, std_cxx_inc && c_dialect_cxx (), verbose);
976 flag_inline_trees = 1;
978 /* Use tree inlining. */
981 if (flag_inline_functions)
982 flag_inline_trees = 2;
984 /* If we are given more than one input file, we must use
985 unit-at-a-time mode. */
986 if (num_in_fnames > 1)
987 flag_unit_at_a_time = 1;
989 /* Default to ObjC sjlj exception handling if NeXT runtime. */
990 if (flag_objc_sjlj_exceptions < 0)
991 flag_objc_sjlj_exceptions = flag_next_runtime;
992 if (flag_objc_exceptions && !flag_objc_sjlj_exceptions)
995 /* -Wextra implies -Wsign-compare and -Wmissing-field-initializers,
996 but not if explicitly overridden. */
997 if (warn_sign_compare == -1)
998 warn_sign_compare = extra_warnings;
999 if (warn_missing_field_initializers == -1)
1000 warn_missing_field_initializers = extra_warnings;
1002 /* -Wpointer_sign is disabled by default, but it is enabled if any
1003 of -Wall or -pedantic are given. */
1004 if (warn_pointer_sign == -1)
1005 warn_pointer_sign = 0;
1007 /* Special format checking options don't work without -Wformat; warn if
1011 warning (OPT_Wformat_y2k,
1012 "-Wformat-y2k ignored without -Wformat");
1013 warning (OPT_Wformat_extra_args,
1014 "-Wformat-extra-args ignored without -Wformat");
1015 warning (OPT_Wformat_zero_length,
1016 "-Wformat-zero-length ignored without -Wformat");
1017 warning (OPT_Wformat_nonliteral,
1018 "-Wformat-nonliteral ignored without -Wformat");
1019 warning (OPT_Wformat_security,
1020 "-Wformat-security ignored without -Wformat");
1023 /* C99 requires special handling of complex multiplication and division;
1024 -ffast-math and -fcx-limited-range are handled in process_options. */
1026 flag_complex_method = 2;
1028 if (flag_preprocess_only)
1030 /* Open the output now. We must do so even if flag_no_output is
1031 on, because there may be other output than from the actual
1032 preprocessing (e.g. from -dM). */
1033 if (out_fname[0] == '\0')
1034 out_stream = stdout;
1036 out_stream = fopen (out_fname, "w");
1038 if (out_stream == NULL)
1040 fatal_error ("opening output file %s: %m", out_fname);
1044 if (num_in_fnames > 1)
1045 error ("too many filenames given. Type %s --help for usage",
1048 init_pp_output (out_stream);
1054 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1055 input_location = UNKNOWN_LOCATION;
1058 cb = cpp_get_callbacks (parse_in);
1059 cb->file_change = cb_file_change;
1060 cb->dir_change = cb_dir_change;
1061 cpp_post_options (parse_in);
1063 input_location = UNKNOWN_LOCATION;
1065 /* If an error has occurred in cpplib, note it so we fail
1067 errorcount += cpp_errors (parse_in);
1069 *pfilename = this_input_filename
1070 = cpp_read_main_file (parse_in, in_fnames[0]);
1071 /* Don't do any compilation or preprocessing if there is no input file. */
1072 if (this_input_filename == NULL)
1078 if (flag_working_directory
1079 && flag_preprocess_only && !flag_no_line_commands)
1080 pp_dir_change (parse_in, get_src_pwd ());
1082 return flag_preprocess_only;
1085 /* Front end initialization common to C, ObjC and C++. */
1087 c_common_init (void)
1089 /* Set up preprocessor arithmetic. Must be done after call to
1090 c_common_nodes_and_builtins for type nodes to be good. */
1091 cpp_opts->precision = TYPE_PRECISION (intmax_type_node);
1092 cpp_opts->char_precision = TYPE_PRECISION (char_type_node);
1093 cpp_opts->int_precision = TYPE_PRECISION (integer_type_node);
1094 cpp_opts->wchar_precision = TYPE_PRECISION (wchar_type_node);
1095 cpp_opts->unsigned_wchar = TYPE_UNSIGNED (wchar_type_node);
1096 cpp_opts->bytes_big_endian = BYTES_BIG_ENDIAN;
1098 /* This can't happen until after wchar_precision and bytes_big_endian
1100 cpp_init_iconv (parse_in);
1103 c_common_print_pch_checksum (stderr);
1105 if (flag_preprocess_only)
1108 preprocess_file (parse_in);
1112 /* Has to wait until now so that cpplib has its hash table. */
1118 /* Initialize the integrated preprocessor after debug output has been
1119 initialized; loop over each input file. */
1121 c_common_parse_file (int set_yydebug)
1125 /* Enable parser debugging, if requested and we can. If requested
1126 and we can't, notify the user. */
1128 yydebug = set_yydebug;
1131 warning (0, "YYDEBUG was not defined at build time, -dy ignored");
1137 /* Start the main input file, if the debug writer wants it. */
1138 if (debug_hooks->start_end_main_source_file)
1139 (*debug_hooks->start_source_file) (0, this_input_filename);
1146 /* And end the main input file, if the debug writer wants it */
1147 if (debug_hooks->start_end_main_source_file)
1148 (*debug_hooks->end_source_file) (0);
1149 if (++i >= num_in_fnames)
1151 cpp_undef_all (parse_in);
1153 = cpp_read_main_file (parse_in, in_fnames[i]);
1154 /* If an input file is missing, abandon further compilation.
1155 cpplib has issued a diagnostic. */
1156 if (!this_input_filename)
1161 /* Common finish hook for the C, ObjC and C++ front ends. */
1163 c_common_finish (void)
1165 FILE *deps_stream = NULL;
1167 if (cpp_opts->deps.style != DEPS_NONE)
1169 /* If -M or -MM was seen without -MF, default output to the
1172 deps_stream = out_stream;
1175 deps_stream = fopen (deps_file, deps_append ? "a": "w");
1177 fatal_error ("opening dependency file %s: %m", deps_file);
1181 /* For performance, avoid tearing down cpplib's internal structures
1182 with cpp_destroy (). */
1183 errorcount += cpp_finish (parse_in, deps_stream);
1185 if (deps_stream && deps_stream != out_stream
1186 && (ferror (deps_stream) || fclose (deps_stream)))
1187 fatal_error ("closing dependency file %s: %m", deps_file);
1189 if (out_stream && (ferror (out_stream) || fclose (out_stream)))
1190 fatal_error ("when writing output to %s: %m", out_fname);
1193 /* Either of two environment variables can specify output of
1194 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1195 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1196 and DEPS_TARGET is the target to mention in the deps. They also
1197 result in dependency information being appended to the output file
1198 rather than overwriting it, and like Sun's compiler
1199 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1201 check_deps_environment_vars (void)
1205 GET_ENVIRONMENT (spec, "DEPENDENCIES_OUTPUT");
1207 cpp_opts->deps.style = DEPS_USER;
1210 GET_ENVIRONMENT (spec, "SUNPRO_DEPENDENCIES");
1213 cpp_opts->deps.style = DEPS_SYSTEM;
1214 cpp_opts->deps.ignore_main_file = true;
1220 /* Find the space before the DEPS_TARGET, if there is one. */
1221 char *s = strchr (spec, ' ');
1224 /* Let the caller perform MAKE quoting. */
1225 defer_opt (OPT_MT, s + 1);
1229 /* Command line -MF overrides environment variables and default. */
1238 /* Handle deferred command line switches. */
1240 handle_deferred_opts (void)
1245 /* Avoid allocating the deps buffer if we don't need it.
1246 (This flag may be true without there having been -MT or -MQ
1247 options, but we'll still need the deps buffer.) */
1251 deps = cpp_get_deps (parse_in);
1253 for (i = 0; i < deferred_count; i++)
1255 struct deferred_opt *opt = &deferred_opts[i];
1257 if (opt->code == OPT_MT || opt->code == OPT_MQ)
1258 deps_add_target (deps, opt->arg, opt->code == OPT_MQ);
1262 /* These settings are appropriate for GCC, but not necessarily so for
1263 cpplib as a library. */
1265 sanitize_cpp_opts (void)
1267 /* If we don't know what style of dependencies to output, complain
1268 if any other dependency switches have been given. */
1269 if (deps_seen && cpp_opts->deps.style == DEPS_NONE)
1270 error ("to generate dependencies you must specify either -M or -MM");
1272 /* -dM and dependencies suppress normal output; do it here so that
1273 the last -d[MDN] switch overrides earlier ones. */
1274 if (flag_dump_macros == 'M')
1277 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1278 -dM since at least glibc relies on -M -dM to work. */
1279 /* Also, flag_no_output implies flag_no_line_commands, always. */
1282 if (flag_dump_macros != 'M')
1283 flag_dump_macros = 0;
1284 flag_dump_includes = 0;
1285 flag_no_line_commands = 1;
1288 cpp_opts->unsigned_char = !flag_signed_char;
1289 cpp_opts->stdc_0_in_system_headers = STDC_0_IN_SYSTEM_HEADERS;
1291 /* We want -Wno-long-long to override -pedantic -std=non-c99
1292 and/or -Wtraditional, whatever the ordering. */
1293 cpp_opts->warn_long_long
1294 = warn_long_long && ((!flag_isoc99 && pedantic) || warn_traditional);
1296 /* Similarly with -Wno-variadic-macros. No check for c99 here, since
1297 this also turns off warnings about GCCs extension. */
1298 cpp_opts->warn_variadic_macros
1299 = warn_variadic_macros && (pedantic || warn_traditional);
1301 /* If we're generating preprocessor output, emit current directory
1302 if explicitly requested or if debugging information is enabled.
1303 ??? Maybe we should only do it for debugging formats that
1304 actually output the current directory? */
1305 if (flag_working_directory == -1)
1306 flag_working_directory = (debug_info_level != DINFO_LEVEL_NONE);
1309 /* Add include path with a prefix at the front of its name. */
1311 add_prefixed_path (const char *suffix, size_t chain)
1315 size_t prefix_len, suffix_len;
1317 suffix_len = strlen (suffix);
1318 prefix = iprefix ? iprefix : cpp_GCC_INCLUDE_DIR;
1319 prefix_len = iprefix ? strlen (iprefix) : cpp_GCC_INCLUDE_DIR_len;
1321 path = (char *) xmalloc (prefix_len + suffix_len + 1);
1322 memcpy (path, prefix, prefix_len);
1323 memcpy (path + prefix_len, suffix, suffix_len);
1324 path[prefix_len + suffix_len] = '\0';
1326 add_path (path, chain, 0, false);
1329 /* Handle -D, -U, -A, -imacros, and the first -include. */
1331 finish_options (void)
1333 if (!cpp_opts->preprocessed)
1337 cb_file_change (parse_in,
1338 linemap_add (&line_table, LC_RENAME, 0,
1339 _("<built-in>"), 0));
1341 cpp_init_builtins (parse_in, flag_hosted);
1342 c_cpp_builtins (parse_in);
1344 /* We're about to send user input to cpplib, so make it warn for
1345 things that we previously (when we sent it internal definitions)
1346 told it to not warn.
1348 C99 permits implementation-defined characters in identifiers.
1349 The documented meaning of -std= is to turn off extensions that
1350 conflict with the specified standard, and since a strictly
1351 conforming program cannot contain a '$', we do not condition
1352 their acceptance on the -std= setting. */
1353 cpp_opts->warn_dollars = (cpp_opts->pedantic && !cpp_opts->c99);
1355 cpp_change_file (parse_in, LC_RENAME, _("<command line>"));
1356 for (i = 0; i < deferred_count; i++)
1358 struct deferred_opt *opt = &deferred_opts[i];
1360 if (opt->code == OPT_D)
1361 cpp_define (parse_in, opt->arg);
1362 else if (opt->code == OPT_U)
1363 cpp_undef (parse_in, opt->arg);
1364 else if (opt->code == OPT_A)
1366 if (opt->arg[0] == '-')
1367 cpp_unassert (parse_in, opt->arg + 1);
1369 cpp_assert (parse_in, opt->arg);
1373 /* Handle -imacros after -D and -U. */
1374 for (i = 0; i < deferred_count; i++)
1376 struct deferred_opt *opt = &deferred_opts[i];
1378 if (opt->code == OPT_imacros
1379 && cpp_push_include (parse_in, opt->arg))
1381 /* Disable push_command_line_include callback for now. */
1382 include_cursor = deferred_count + 1;
1383 cpp_scan_nooutput (parse_in);
1389 push_command_line_include ();
1392 /* Give CPP the next file given by -include, if any. */
1394 push_command_line_include (void)
1396 while (include_cursor < deferred_count)
1398 struct deferred_opt *opt = &deferred_opts[include_cursor++];
1400 if (!cpp_opts->preprocessed && opt->code == OPT_include
1401 && cpp_push_include (parse_in, opt->arg))
1405 if (include_cursor == deferred_count)
1408 /* -Wunused-macros should only warn about macros defined hereafter. */
1409 cpp_opts->warn_unused_macros = warn_unused_macros;
1410 /* Restore the line map from <command line>. */
1411 if (!cpp_opts->preprocessed)
1412 cpp_change_file (parse_in, LC_RENAME, this_input_filename);
1414 /* Set this here so the client can change the option if it wishes,
1415 and after stacking the main file so we don't trace the main file. */
1416 line_table.trace_includes = cpp_opts->print_include_names;
1420 /* File change callback. Has to handle -include files. */
1422 cb_file_change (cpp_reader * ARG_UNUSED (pfile),
1423 const struct line_map *new_map)
1425 if (flag_preprocess_only)
1426 pp_file_change (new_map);
1428 fe_file_change (new_map);
1430 if (new_map == 0 || (new_map->reason == LC_LEAVE && MAIN_FILE_P (new_map)))
1431 push_command_line_include ();
1435 cb_dir_change (cpp_reader * ARG_UNUSED (pfile), const char *dir)
1437 if (!set_src_pwd (dir))
1438 warning (0, "too late for # directive to set debug directory");
1441 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1442 extensions if ISO). There is no concept of gnu94. */
1444 set_std_c89 (int c94, int iso)
1446 cpp_set_lang (parse_in, c94 ? CLK_STDC94: iso ? CLK_STDC89: CLK_GNUC89);
1449 flag_no_gnu_keywords = iso;
1450 flag_no_nonansi_builtin = iso;
1455 /* Set the C 99 standard (without GNU extensions if ISO). */
1457 set_std_c99 (int iso)
1459 cpp_set_lang (parse_in, iso ? CLK_STDC99: CLK_GNUC99);
1461 flag_no_nonansi_builtin = iso;
1467 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1469 set_std_cxx98 (int iso)
1471 cpp_set_lang (parse_in, iso ? CLK_CXX98: CLK_GNUCXX);
1472 flag_no_gnu_keywords = iso;
1473 flag_no_nonansi_builtin = iso;
1477 /* Handle setting implicit to ON. */
1479 set_Wimplicit (int on)
1482 warn_implicit_int = on;
1485 if (mesg_implicit_function_declaration != 2)
1486 mesg_implicit_function_declaration = 1;
1489 mesg_implicit_function_declaration = 0;
1492 /* Args to -d specify what to dump. Silently ignore
1493 unrecognized options; they may be aimed at toplev.c. */
1495 handle_OPT_d (const char *arg)
1499 while ((c = *arg++) != '\0')
1502 case 'M': /* Dump macros only. */
1503 case 'N': /* Dump names. */
1504 case 'D': /* Dump definitions. */
1505 flag_dump_macros = c;
1509 flag_dump_includes = 1;