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_cxx0x (int);
113 static void set_std_c89 (int, int);
114 static void set_std_c99 (int);
115 static void check_deps_environment_vars (void);
116 static void handle_deferred_opts (void);
117 static void sanitize_cpp_opts (void);
118 static void add_prefixed_path (const char *, size_t);
119 static void push_command_line_include (void);
120 static void cb_file_change (cpp_reader *, const struct line_map *);
121 static void cb_dir_change (cpp_reader *, const char *);
122 static void finish_options (void);
124 #ifndef STDC_0_IN_SYSTEM_HEADERS
125 #define STDC_0_IN_SYSTEM_HEADERS 0
128 /* Holds switches parsed by c_common_handle_option (), but whose
129 handling is deferred to c_common_post_options (). */
130 static void defer_opt (enum opt_code, const char *);
131 static struct deferred_opt
137 /* Complain that switch CODE expects an argument but none was
138 provided. OPT was the command-line option. Return FALSE to get
139 the default message in opts.c, TRUE if we provide a specialized
142 c_common_missing_argument (const char *opt, size_t code)
147 /* Pick up the default message. */
150 case OPT_fconstant_string_class_:
151 error ("no class name specified with %qs", opt);
155 error ("assertion missing after %qs", opt);
160 error ("macro name missing after %qs", opt);
169 error ("missing path after %qs", opt);
178 error ("missing filename after %qs", opt);
183 error ("missing makefile target after %qs", opt);
190 /* Defer option CODE with argument ARG. */
192 defer_opt (enum opt_code code, const char *arg)
194 deferred_opts[deferred_count].code = code;
195 deferred_opts[deferred_count].arg = arg;
199 /* Common initialization before parsing options. */
201 c_common_init_options (unsigned int argc, const char **argv)
203 static const unsigned int lang_flags[] = {CL_C, CL_ObjC, CL_CXX, CL_ObjCXX};
204 unsigned int i, result;
206 /* This is conditionalized only because that is the way the front
207 ends used to do it. Maybe this should be unconditional? */
208 if (c_dialect_cxx ())
210 /* By default wrap lines at 80 characters. Is getenv
211 ("COLUMNS") preferable? */
212 diagnostic_line_cutoff (global_dc) = 80;
213 /* By default, emit location information once for every
214 diagnostic message. */
215 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
218 parse_in = cpp_create_reader (c_dialect_cxx () ? CLK_GNUCXX: CLK_GNUC89,
219 ident_hash, &line_table);
221 cpp_opts = cpp_get_options (parse_in);
222 cpp_opts->dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
223 cpp_opts->objc = c_dialect_objc ();
225 /* Reset to avoid warnings on internal definitions. We set it just
226 before passing on command-line options to cpplib. */
227 cpp_opts->warn_dollars = 0;
229 flag_exceptions = c_dialect_cxx ();
230 warn_pointer_arith = c_dialect_cxx ();
231 warn_write_strings = c_dialect_cxx();
233 deferred_opts = XNEWVEC (struct deferred_opt, argc);
235 result = lang_flags[c_language];
237 if (c_language == clk_c)
239 /* If preprocessing assembly language, accept any of the C-family
240 front end options since the driver may pass them through. */
241 for (i = 1; i < argc; i++)
242 if (! strcmp (argv[i], "-lang-asm"))
244 result |= CL_C | CL_ObjC | CL_CXX | CL_ObjCXX;
249 for (i = 1; i < argc; i++)
250 if (! strcmp (argv[i], "-lang-fortran"))
252 result |= CL_Fortran;
261 /* Handle switch SCODE with argument ARG. VALUE is true, unless no-
262 form of an -f or -W option was given. Returns 0 if the switch was
263 invalid, a negative number to prevent language-independent
264 processing in toplev.c (a hack necessary for the short-term). */
266 c_common_handle_option (size_t scode, const char *arg, int value)
268 const struct cl_option *option = &cl_options[scode];
269 enum opt_code code = (enum opt_code) scode;
272 /* Prevent resetting the language standard to a C dialect when the driver
273 has already determined that we're looking at assembler input. */
274 bool preprocessing_asm_p = (cpp_get_options (parse_in)->lang == CLK_ASM);
279 if (cl_options[code].flags & (CL_C | CL_CXX | CL_ObjC | CL_ObjCXX))
282 if (lang_fortran && (cl_options[code].flags & (CL_Fortran)))
288 case OPT__output_pch_:
293 defer_opt (code, arg);
297 cpp_opts->discard_comments = 0;
301 cpp_opts->discard_comments = 0;
302 cpp_opts->discard_comments_in_macro_exp = 0;
306 defer_opt (code, arg);
310 flag_preprocess_only = 1;
314 cpp_opts->print_include_names = 1;
318 TARGET_OPTF (xstrdup (arg));
322 if (strcmp (arg, "-"))
323 add_path (xstrdup (arg), BRACKET, 0, true);
326 if (quote_chain_split)
327 error ("-I- specified twice");
328 quote_chain_split = true;
329 split_quote_chain ();
330 inform ("obsolete option -I- used, please use -iquote instead");
336 /* When doing dependencies with -M or -MM, suppress normal
337 preprocessed output, but still do -dM etc. as software
338 depends on this. Preprocessed output does occur if -MD, -MMD
339 or environment var dependency generation is used. */
340 cpp_opts->deps.style = (code == OPT_M ? DEPS_SYSTEM: DEPS_USER);
342 cpp_opts->inhibit_warnings = 1;
347 cpp_opts->deps.style = (code == OPT_MD ? DEPS_SYSTEM: DEPS_USER);
358 cpp_opts->deps.missing_files = true;
363 cpp_opts->deps.phony_targets = true;
369 defer_opt (code, arg);
373 flag_no_line_commands = 1;
376 case OPT_fworking_directory:
377 flag_working_directory = value;
381 defer_opt (code, arg);
387 set_Wimplicit (value);
388 warn_char_subscripts = value;
389 warn_missing_braces = value;
390 warn_parentheses = value;
391 warn_return_type = value;
392 warn_sequence_point = value; /* Was C only. */
393 if (c_dialect_cxx ())
394 warn_sign_compare = value;
396 warn_strict_aliasing = value;
397 warn_string_literal_comparison = value;
398 warn_always_true = value;
400 /* Only warn about unknown pragmas that are not in system
402 warn_unknown_pragmas = value;
404 /* We save the value of warn_uninitialized, since if they put
405 -Wuninitialized on the command line, we need to generate a
406 warning about not using it without also specifying -O. */
407 if (warn_uninitialized != 1)
408 warn_uninitialized = (value ? 2 : 0);
410 if (!c_dialect_cxx ())
411 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding
412 can turn it off only if it's not explicit. */
413 warn_main = value * 2;
416 /* C++-specific warnings. */
417 warn_reorder = value;
418 warn_nontemplate_friend = value;
420 warn_write_strings = true;
423 cpp_opts->warn_trigraphs = value;
424 cpp_opts->warn_comments = value;
425 cpp_opts->warn_num_sign_change = value;
426 cpp_opts->warn_multichar = value; /* Was C++ only. */
428 if (warn_pointer_sign == -1)
429 warn_pointer_sign = 1;
434 cpp_opts->warn_comments = value;
437 case OPT_Wdeprecated:
438 cpp_opts->warn_deprecated = value;
441 case OPT_Wendif_labels:
442 cpp_opts->warn_endif_labels = value;
446 cpp_opts->warnings_are_errors = value;
447 global_dc->warning_as_error_requested = value;
450 case OPT_Werror_implicit_function_declaration:
451 mesg_implicit_function_declaration = 2;
459 set_Wformat (atoi (arg));
463 set_Wimplicit (value);
467 /* Silently ignore for now. */
470 case OPT_Winvalid_pch:
471 cpp_opts->warn_invalid_pch = value;
481 case OPT_Wmissing_include_dirs:
482 cpp_opts->warn_missing_include_dirs = value;
486 cpp_opts->warn_multichar = value;
489 case OPT_Wnormalized_:
490 if (!value || (arg && strcasecmp (arg, "none") == 0))
491 cpp_opts->warn_normalize = normalized_none;
492 else if (!arg || strcasecmp (arg, "nfkc") == 0)
493 cpp_opts->warn_normalize = normalized_KC;
494 else if (strcasecmp (arg, "id") == 0)
495 cpp_opts->warn_normalize = normalized_identifier_C;
496 else if (strcasecmp (arg, "nfc") == 0)
497 cpp_opts->warn_normalize = normalized_C;
499 error ("argument %qs to %<-Wnormalized%> not recognized", arg);
502 case OPT_Wreturn_type:
503 warn_return_type = value;
506 case OPT_Wstrict_null_sentinel:
507 warn_strict_null_sentinel = value;
510 case OPT_Wsystem_headers:
511 cpp_opts->warn_system_headers = value;
514 case OPT_Wtraditional:
515 cpp_opts->warn_traditional = value;
519 cpp_opts->warn_trigraphs = value;
523 cpp_opts->warn_undef = value;
526 case OPT_Wunknown_pragmas:
527 /* Set to greater than 1, so that even unknown pragmas in
528 system headers will be warned about. */
529 warn_unknown_pragmas = value * 2;
532 case OPT_Wunused_macros:
533 warn_unused_macros = value;
536 case OPT_Wvariadic_macros:
537 warn_variadic_macros = value;
540 case OPT_Wwrite_strings:
541 warn_write_strings = value;
547 warn_nonvdtor = true;
551 if (!c_dialect_cxx ())
552 set_std_c89 (false, true);
554 set_std_cxx98 (true);
561 case OPT_fcond_mismatch:
562 if (!c_dialect_cxx ())
564 flag_cond_mismatch = value;
569 case OPT_fall_virtual:
570 case OPT_falt_external_templates:
571 case OPT_fenum_int_equiv:
572 case OPT_fexternal_templates:
573 case OPT_fguiding_decls:
575 case OPT_fhuge_objects:
577 case OPT_fname_mangling_version_:
579 case OPT_fnonnull_objects:
581 case OPT_fstrict_prototype:
582 case OPT_fthis_is_variable:
583 case OPT_fvtable_thunks:
586 warning (0, "switch %qs is no longer supported", option->opt_text);
589 case OPT_faccess_control:
590 flag_access_control = value;
594 flag_no_asm = !value;
598 flag_no_builtin = !value;
605 disable_builtin_function (arg);
608 case OPT_fdollars_in_identifiers:
609 cpp_opts->dollars_in_ident = value;
612 case OPT_ffreestanding:
614 /* Fall through.... */
617 flag_no_builtin = !value;
618 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
619 if (!value && warn_main == 2)
623 case OPT_fshort_double:
624 flag_short_double = value;
627 case OPT_fshort_enums:
628 flag_short_enums = value;
631 case OPT_fshort_wchar:
632 flag_short_wchar = value;
635 case OPT_fsigned_bitfields:
636 flag_signed_bitfields = value;
639 case OPT_fsigned_char:
640 flag_signed_char = value;
643 case OPT_funsigned_bitfields:
644 flag_signed_bitfields = !value;
647 case OPT_funsigned_char:
648 flag_signed_char = !value;
652 flag_check_new = value;
655 case OPT_fconserve_space:
656 flag_conserve_space = value;
659 case OPT_fconstant_string_class_:
660 constant_string_class_name = arg;
663 case OPT_fdefault_inline:
664 flag_default_inline = value;
667 case OPT_felide_constructors:
668 flag_elide_constructors = value;
671 case OPT_fenforce_eh_specs:
672 flag_enforce_eh_specs = value;
675 case OPT_fextended_identifiers:
676 cpp_opts->extended_identifiers = value;
680 flag_new_for_scope = value;
683 case OPT_fgnu_keywords:
684 flag_no_gnu_keywords = !value;
687 case OPT_fgnu_runtime:
688 flag_next_runtime = !value;
691 case OPT_fhandle_exceptions:
692 warning (0, "-fhandle-exceptions has been renamed -fexceptions (and is now on by default)");
693 flag_exceptions = value;
696 case OPT_fimplement_inlines:
697 flag_implement_inlines = value;
700 case OPT_fimplicit_inline_templates:
701 flag_implicit_inline_templates = value;
704 case OPT_fimplicit_templates:
705 flag_implicit_templates = value;
708 case OPT_flax_vector_conversions:
709 flag_lax_vector_conversions = value;
712 case OPT_fms_extensions:
713 flag_ms_extensions = value;
716 case OPT_fnext_runtime:
717 flag_next_runtime = value;
720 case OPT_fnil_receivers:
721 flag_nil_receivers = value;
724 case OPT_fnonansi_builtins:
725 flag_no_nonansi_builtin = !value;
728 case OPT_foperator_names:
729 cpp_opts->operator_names = value;
732 case OPT_foptional_diags:
733 flag_optional_diags = value;
737 cpp_opts->restore_pch_deps = value;
740 case OPT_fpch_preprocess:
741 flag_pch_preprocess = value;
744 case OPT_fpermissive:
745 flag_permissive = value;
748 case OPT_fpreprocessed:
749 cpp_opts->preprocessed = value;
752 case OPT_freplace_objc_classes:
753 flag_replace_objc_classes = value;
757 flag_use_repository = value;
759 flag_implicit_templates = 0;
766 case OPT_fshow_column:
767 cpp_opts->show_column = value;
771 flag_detailed_statistics = value;
775 /* It is documented that we silently ignore silly values. */
776 if (value >= 1 && value <= 100)
777 cpp_opts->tabstop = value;
780 case OPT_fexec_charset_:
781 cpp_opts->narrow_charset = arg;
784 case OPT_fwide_exec_charset_:
785 cpp_opts->wide_charset = arg;
788 case OPT_finput_charset_:
789 cpp_opts->input_charset = arg;
792 case OPT_ftemplate_depth_:
793 max_tinst_depth = value;
796 case OPT_fuse_cxa_atexit:
797 flag_use_cxa_atexit = value;
800 case OPT_fuse_cxa_get_exception_ptr:
801 flag_use_cxa_get_exception_ptr = value;
804 case OPT_fvisibility_inlines_hidden:
805 visibility_options.inlines_hidden = value;
812 case OPT_fthreadsafe_statics:
813 flag_threadsafe_statics = value;
817 flag_zero_link = value;
821 flag_gen_declaration = 1;
825 add_path (xstrdup (arg), AFTER, 0, true);
830 defer_opt (code, arg);
842 add_path (xstrdup (arg), QUOTE, 0, true);
850 add_path (xstrdup (arg), SYSTEM, 0, true);
853 case OPT_iwithprefix:
854 add_prefixed_path (arg, SYSTEM);
857 case OPT_iwithprefixbefore:
858 add_prefixed_path (arg, BRACKET);
862 cpp_set_lang (parse_in, CLK_ASM);
863 cpp_opts->dollars_in_ident = false;
866 case OPT_lang_fortran:
886 error ("output filename specified twice");
889 /* We need to handle the -pedantic switches here, rather than in
890 c_common_post_options, so that a subsequent -Wno-endif-labels
891 is not overridden. */
892 case OPT_pedantic_errors:
893 cpp_opts->pedantic_errors = 1;
896 cpp_opts->pedantic = 1;
897 cpp_opts->warn_endif_labels = 1;
898 if (warn_pointer_sign == -1)
899 warn_pointer_sign = 1;
900 if (warn_overlength_strings == -1)
901 warn_overlength_strings = 1;
904 case OPT_print_objc_runtime_info:
905 print_struct_values = 1;
908 case OPT_print_pch_checksum:
909 c_common_print_pch_checksum (stdout);
910 exit_after_options = true;
918 case OPT_std_gnu__98:
919 if (!preprocessing_asm_p)
920 set_std_cxx98 (code == OPT_std_c__98 /* ISO */);
924 case OPT_std_gnu__0x:
925 if (!preprocessing_asm_p)
926 set_std_cxx0x (code == OPT_std_c__0x /* ISO */);
930 case OPT_std_iso9899_1990:
931 case OPT_std_iso9899_199409:
932 if (!preprocessing_asm_p)
933 set_std_c89 (code == OPT_std_iso9899_199409 /* c94 */, true /* ISO */);
937 if (!preprocessing_asm_p)
938 set_std_c89 (false /* c94 */, false /* ISO */);
943 case OPT_std_iso9899_1999:
944 case OPT_std_iso9899_199x:
945 if (!preprocessing_asm_p)
946 set_std_c99 (true /* ISO */);
951 if (!preprocessing_asm_p)
952 set_std_c99 (false /* ISO */);
956 cpp_opts->trigraphs = 1;
959 case OPT_traditional_cpp:
960 cpp_opts->traditional = 1;
968 cpp_opts->inhibit_warnings = 1;
979 /* Post-switch processing. */
981 c_common_post_options (const char **pfilename)
983 struct cpp_callbacks *cb;
985 /* Canonicalize the input and output filenames. */
986 if (in_fnames == NULL)
988 in_fnames = XNEWVEC (const char *, 1);
991 else if (strcmp (in_fnames[0], "-") == 0)
994 if (out_fname == NULL || !strcmp (out_fname, "-"))
997 if (cpp_opts->deps.style == DEPS_NONE)
998 check_deps_environment_vars ();
1000 handle_deferred_opts ();
1002 sanitize_cpp_opts ();
1004 register_include_chains (parse_in, sysroot, iprefix, imultilib,
1005 std_inc, std_cxx_inc && c_dialect_cxx (), verbose);
1007 #ifdef C_COMMON_OVERRIDE_OPTIONS
1008 /* Some machines may reject certain combinations of C
1009 language-specific options. */
1010 C_COMMON_OVERRIDE_OPTIONS;
1013 flag_inline_trees = 1;
1015 /* Use tree inlining. */
1016 if (!flag_no_inline)
1018 if (flag_inline_functions)
1019 flag_inline_trees = 2;
1021 /* If we are given more than one input file, we must use
1022 unit-at-a-time mode. */
1023 if (num_in_fnames > 1)
1024 flag_unit_at_a_time = 1;
1026 /* Default to ObjC sjlj exception handling if NeXT runtime. */
1027 if (flag_objc_sjlj_exceptions < 0)
1028 flag_objc_sjlj_exceptions = flag_next_runtime;
1029 if (flag_objc_exceptions && !flag_objc_sjlj_exceptions)
1030 flag_exceptions = 1;
1032 /* -Wextra implies -Wclobbered, -Wempty-body, -Wsign-compare,
1033 -Wmissing-field-initializers, -Wmissing-parameter-type
1034 -Wold-style-declaration, and -Woverride-init,
1035 but not if explicitly overridden. */
1036 if (warn_clobbered == -1)
1037 warn_clobbered = extra_warnings;
1038 if (warn_empty_body == -1)
1039 warn_empty_body = extra_warnings;
1040 if (warn_sign_compare == -1)
1041 warn_sign_compare = extra_warnings;
1042 if (warn_missing_field_initializers == -1)
1043 warn_missing_field_initializers = extra_warnings;
1044 if (warn_missing_parameter_type == -1)
1045 warn_missing_parameter_type = extra_warnings;
1046 if (warn_old_style_declaration == -1)
1047 warn_old_style_declaration = extra_warnings;
1048 if (warn_override_init == -1)
1049 warn_override_init = extra_warnings;
1051 /* -Wpointer_sign is disabled by default, but it is enabled if any
1052 of -Wall or -pedantic are given. */
1053 if (warn_pointer_sign == -1)
1054 warn_pointer_sign = 0;
1056 /* -Woverlength-strings is off by default, but is enabled by -pedantic.
1057 It is never enabled in C++, as the minimum limit is not normative
1058 in that standard. */
1059 if (warn_overlength_strings == -1 || c_dialect_cxx ())
1060 warn_overlength_strings = 0;
1062 /* Special format checking options don't work without -Wformat; warn if
1066 warning (OPT_Wformat_y2k,
1067 "-Wformat-y2k ignored without -Wformat");
1068 warning (OPT_Wformat_extra_args,
1069 "-Wformat-extra-args ignored without -Wformat");
1070 warning (OPT_Wformat_zero_length,
1071 "-Wformat-zero-length ignored without -Wformat");
1072 warning (OPT_Wformat_nonliteral,
1073 "-Wformat-nonliteral ignored without -Wformat");
1074 warning (OPT_Wformat_security,
1075 "-Wformat-security ignored without -Wformat");
1078 /* C99 requires special handling of complex multiplication and division;
1079 -ffast-math and -fcx-limited-range are handled in process_options. */
1081 flag_complex_method = 2;
1083 if (flag_preprocess_only)
1085 /* Open the output now. We must do so even if flag_no_output is
1086 on, because there may be other output than from the actual
1087 preprocessing (e.g. from -dM). */
1088 if (out_fname[0] == '\0')
1089 out_stream = stdout;
1091 out_stream = fopen (out_fname, "w");
1093 if (out_stream == NULL)
1095 fatal_error ("opening output file %s: %m", out_fname);
1099 if (num_in_fnames > 1)
1100 error ("too many filenames given. Type %s --help for usage",
1103 init_pp_output (out_stream);
1109 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1110 input_location = UNKNOWN_LOCATION;
1113 cb = cpp_get_callbacks (parse_in);
1114 cb->file_change = cb_file_change;
1115 cb->dir_change = cb_dir_change;
1116 cpp_post_options (parse_in);
1118 input_location = UNKNOWN_LOCATION;
1120 /* If an error has occurred in cpplib, note it so we fail
1122 errorcount += cpp_errors (parse_in);
1124 *pfilename = this_input_filename
1125 = cpp_read_main_file (parse_in, in_fnames[0]);
1126 /* Don't do any compilation or preprocessing if there is no input file. */
1127 if (this_input_filename == NULL)
1133 if (flag_working_directory
1134 && flag_preprocess_only && !flag_no_line_commands)
1135 pp_dir_change (parse_in, get_src_pwd ());
1137 return flag_preprocess_only;
1140 /* Front end initialization common to C, ObjC and C++. */
1142 c_common_init (void)
1144 /* Set up preprocessor arithmetic. Must be done after call to
1145 c_common_nodes_and_builtins for type nodes to be good. */
1146 cpp_opts->precision = TYPE_PRECISION (intmax_type_node);
1147 cpp_opts->char_precision = TYPE_PRECISION (char_type_node);
1148 cpp_opts->int_precision = TYPE_PRECISION (integer_type_node);
1149 cpp_opts->wchar_precision = TYPE_PRECISION (wchar_type_node);
1150 cpp_opts->unsigned_wchar = TYPE_UNSIGNED (wchar_type_node);
1151 cpp_opts->bytes_big_endian = BYTES_BIG_ENDIAN;
1153 /* This can't happen until after wchar_precision and bytes_big_endian
1155 cpp_init_iconv (parse_in);
1158 c_common_print_pch_checksum (stderr);
1160 if (flag_preprocess_only)
1163 preprocess_file (parse_in);
1167 /* Has to wait until now so that cpplib has its hash table. */
1173 /* Initialize the integrated preprocessor after debug output has been
1174 initialized; loop over each input file. */
1176 c_common_parse_file (int set_yydebug)
1184 warning(0, "The C parser does not support -dy, option ignored");
1188 "The Objective-C parser does not support -dy, option ignored");
1191 warning(0, "The C++ parser does not support -dy, option ignored");
1195 "The Objective-C++ parser does not support -dy, option ignored");
1204 /* Start the main input file, if the debug writer wants it. */
1205 if (debug_hooks->start_end_main_source_file)
1206 (*debug_hooks->start_source_file) (0, this_input_filename);
1213 /* And end the main input file, if the debug writer wants it */
1214 if (debug_hooks->start_end_main_source_file)
1215 (*debug_hooks->end_source_file) (0);
1216 if (++i >= num_in_fnames)
1218 cpp_undef_all (parse_in);
1220 = cpp_read_main_file (parse_in, in_fnames[i]);
1221 /* If an input file is missing, abandon further compilation.
1222 cpplib has issued a diagnostic. */
1223 if (!this_input_filename)
1228 /* Common finish hook for the C, ObjC and C++ front ends. */
1230 c_common_finish (void)
1232 FILE *deps_stream = NULL;
1234 if (cpp_opts->deps.style != DEPS_NONE)
1236 /* If -M or -MM was seen without -MF, default output to the
1239 deps_stream = out_stream;
1242 deps_stream = fopen (deps_file, deps_append ? "a": "w");
1244 fatal_error ("opening dependency file %s: %m", deps_file);
1248 /* For performance, avoid tearing down cpplib's internal structures
1249 with cpp_destroy (). */
1250 errorcount += cpp_finish (parse_in, deps_stream);
1252 if (deps_stream && deps_stream != out_stream
1253 && (ferror (deps_stream) || fclose (deps_stream)))
1254 fatal_error ("closing dependency file %s: %m", deps_file);
1256 if (out_stream && (ferror (out_stream) || fclose (out_stream)))
1257 fatal_error ("when writing output to %s: %m", out_fname);
1260 /* Either of two environment variables can specify output of
1261 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1262 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1263 and DEPS_TARGET is the target to mention in the deps. They also
1264 result in dependency information being appended to the output file
1265 rather than overwriting it, and like Sun's compiler
1266 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1268 check_deps_environment_vars (void)
1272 GET_ENVIRONMENT (spec, "DEPENDENCIES_OUTPUT");
1274 cpp_opts->deps.style = DEPS_USER;
1277 GET_ENVIRONMENT (spec, "SUNPRO_DEPENDENCIES");
1280 cpp_opts->deps.style = DEPS_SYSTEM;
1281 cpp_opts->deps.ignore_main_file = true;
1287 /* Find the space before the DEPS_TARGET, if there is one. */
1288 char *s = strchr (spec, ' ');
1291 /* Let the caller perform MAKE quoting. */
1292 defer_opt (OPT_MT, s + 1);
1296 /* Command line -MF overrides environment variables and default. */
1305 /* Handle deferred command line switches. */
1307 handle_deferred_opts (void)
1312 /* Avoid allocating the deps buffer if we don't need it.
1313 (This flag may be true without there having been -MT or -MQ
1314 options, but we'll still need the deps buffer.) */
1318 deps = cpp_get_deps (parse_in);
1320 for (i = 0; i < deferred_count; i++)
1322 struct deferred_opt *opt = &deferred_opts[i];
1324 if (opt->code == OPT_MT || opt->code == OPT_MQ)
1325 deps_add_target (deps, opt->arg, opt->code == OPT_MQ);
1329 /* These settings are appropriate for GCC, but not necessarily so for
1330 cpplib as a library. */
1332 sanitize_cpp_opts (void)
1334 /* If we don't know what style of dependencies to output, complain
1335 if any other dependency switches have been given. */
1336 if (deps_seen && cpp_opts->deps.style == DEPS_NONE)
1337 error ("to generate dependencies you must specify either -M or -MM");
1339 /* -dM and dependencies suppress normal output; do it here so that
1340 the last -d[MDN] switch overrides earlier ones. */
1341 if (flag_dump_macros == 'M')
1344 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1345 -dM since at least glibc relies on -M -dM to work. */
1346 /* Also, flag_no_output implies flag_no_line_commands, always. */
1349 if (flag_dump_macros != 'M')
1350 flag_dump_macros = 0;
1351 flag_dump_includes = 0;
1352 flag_no_line_commands = 1;
1355 cpp_opts->unsigned_char = !flag_signed_char;
1356 cpp_opts->stdc_0_in_system_headers = STDC_0_IN_SYSTEM_HEADERS;
1358 /* We want -Wno-long-long to override -pedantic -std=non-c99
1359 and/or -Wtraditional, whatever the ordering. */
1360 cpp_opts->warn_long_long
1361 = warn_long_long && ((!flag_isoc99 && pedantic) || warn_traditional);
1363 /* Similarly with -Wno-variadic-macros. No check for c99 here, since
1364 this also turns off warnings about GCCs extension. */
1365 cpp_opts->warn_variadic_macros
1366 = warn_variadic_macros && (pedantic || warn_traditional);
1368 /* If we're generating preprocessor output, emit current directory
1369 if explicitly requested or if debugging information is enabled.
1370 ??? Maybe we should only do it for debugging formats that
1371 actually output the current directory? */
1372 if (flag_working_directory == -1)
1373 flag_working_directory = (debug_info_level != DINFO_LEVEL_NONE);
1376 /* Add include path with a prefix at the front of its name. */
1378 add_prefixed_path (const char *suffix, size_t chain)
1382 size_t prefix_len, suffix_len;
1384 suffix_len = strlen (suffix);
1385 prefix = iprefix ? iprefix : cpp_GCC_INCLUDE_DIR;
1386 prefix_len = iprefix ? strlen (iprefix) : cpp_GCC_INCLUDE_DIR_len;
1388 path = (char *) xmalloc (prefix_len + suffix_len + 1);
1389 memcpy (path, prefix, prefix_len);
1390 memcpy (path + prefix_len, suffix, suffix_len);
1391 path[prefix_len + suffix_len] = '\0';
1393 add_path (path, chain, 0, false);
1396 /* Handle -D, -U, -A, -imacros, and the first -include. */
1398 finish_options (void)
1400 if (!cpp_opts->preprocessed)
1404 cb_file_change (parse_in,
1405 linemap_add (&line_table, LC_RENAME, 0,
1406 _("<built-in>"), 0));
1408 cpp_init_builtins (parse_in, flag_hosted);
1409 c_cpp_builtins (parse_in);
1411 /* We're about to send user input to cpplib, so make it warn for
1412 things that we previously (when we sent it internal definitions)
1413 told it to not warn.
1415 C99 permits implementation-defined characters in identifiers.
1416 The documented meaning of -std= is to turn off extensions that
1417 conflict with the specified standard, and since a strictly
1418 conforming program cannot contain a '$', we do not condition
1419 their acceptance on the -std= setting. */
1420 cpp_opts->warn_dollars = (cpp_opts->pedantic && !cpp_opts->c99);
1422 cb_file_change (parse_in,
1423 linemap_add (&line_table, LC_RENAME, 0,
1424 _("<command-line>"), 0));
1426 for (i = 0; i < deferred_count; i++)
1428 struct deferred_opt *opt = &deferred_opts[i];
1430 if (opt->code == OPT_D)
1431 cpp_define (parse_in, opt->arg);
1432 else if (opt->code == OPT_U)
1433 cpp_undef (parse_in, opt->arg);
1434 else if (opt->code == OPT_A)
1436 if (opt->arg[0] == '-')
1437 cpp_unassert (parse_in, opt->arg + 1);
1439 cpp_assert (parse_in, opt->arg);
1443 /* Handle -imacros after -D and -U. */
1444 for (i = 0; i < deferred_count; i++)
1446 struct deferred_opt *opt = &deferred_opts[i];
1448 if (opt->code == OPT_imacros
1449 && cpp_push_include (parse_in, opt->arg))
1451 /* Disable push_command_line_include callback for now. */
1452 include_cursor = deferred_count + 1;
1453 cpp_scan_nooutput (parse_in);
1459 push_command_line_include ();
1462 /* Give CPP the next file given by -include, if any. */
1464 push_command_line_include (void)
1466 while (include_cursor < deferred_count)
1468 struct deferred_opt *opt = &deferred_opts[include_cursor++];
1470 if (!cpp_opts->preprocessed && opt->code == OPT_include
1471 && cpp_push_include (parse_in, opt->arg))
1475 if (include_cursor == deferred_count)
1478 /* -Wunused-macros should only warn about macros defined hereafter. */
1479 cpp_opts->warn_unused_macros = warn_unused_macros;
1480 /* Restore the line map from <command line>. */
1481 if (!cpp_opts->preprocessed)
1482 cpp_change_file (parse_in, LC_RENAME, this_input_filename);
1484 /* Set this here so the client can change the option if it wishes,
1485 and after stacking the main file so we don't trace the main file. */
1486 line_table.trace_includes = cpp_opts->print_include_names;
1490 /* File change callback. Has to handle -include files. */
1492 cb_file_change (cpp_reader * ARG_UNUSED (pfile),
1493 const struct line_map *new_map)
1495 if (flag_preprocess_only)
1496 pp_file_change (new_map);
1498 fe_file_change (new_map);
1500 if (new_map == 0 || (new_map->reason == LC_LEAVE && MAIN_FILE_P (new_map)))
1501 push_command_line_include ();
1505 cb_dir_change (cpp_reader * ARG_UNUSED (pfile), const char *dir)
1507 if (!set_src_pwd (dir))
1508 warning (0, "too late for # directive to set debug directory");
1511 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1512 extensions if ISO). There is no concept of gnu94. */
1514 set_std_c89 (int c94, int iso)
1516 cpp_set_lang (parse_in, c94 ? CLK_STDC94: iso ? CLK_STDC89: CLK_GNUC89);
1519 flag_no_gnu_keywords = iso;
1520 flag_no_nonansi_builtin = iso;
1525 /* Set the C 99 standard (without GNU extensions if ISO). */
1527 set_std_c99 (int iso)
1529 cpp_set_lang (parse_in, iso ? CLK_STDC99: CLK_GNUC99);
1531 flag_no_nonansi_builtin = iso;
1537 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1539 set_std_cxx98 (int iso)
1541 cpp_set_lang (parse_in, iso ? CLK_CXX98: CLK_GNUCXX);
1542 flag_no_gnu_keywords = iso;
1543 flag_no_nonansi_builtin = iso;
1547 /* Set the C++ 0x working draft "standard" (without GNU extensions if ISO). */
1549 set_std_cxx0x (int iso)
1551 cpp_set_lang (parse_in, iso ? CLK_CXX0X: CLK_GNUCXX0X);
1552 flag_no_gnu_keywords = iso;
1553 flag_no_nonansi_builtin = iso;
1558 /* Handle setting implicit to ON. */
1560 set_Wimplicit (int on)
1563 warn_implicit_int = on;
1566 if (mesg_implicit_function_declaration != 2)
1567 mesg_implicit_function_declaration = 1;
1570 mesg_implicit_function_declaration = 0;
1573 /* Args to -d specify what to dump. Silently ignore
1574 unrecognized options; they may be aimed at toplev.c. */
1576 handle_OPT_d (const char *arg)
1580 while ((c = *arg++) != '\0')
1583 case 'M': /* Dump macros only. */
1584 case 'N': /* Dump names. */
1585 case 'D': /* Dump definitions. */
1586 flag_dump_macros = c;
1590 flag_dump_includes = 1;