1 /* C/ObjC/C++ command line option handling.
2 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
3 Free Software Foundation, Inc.
4 Contributed by Neil Booth.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
24 #include "coretypes.h"
31 #include "langhooks.h"
32 #include "tree-inline.h"
33 #include "diagnostic.h"
35 #include "cppdefault.h"
37 #include "debug.h" /* For debug_hooks. */
43 #include "c-tree.h" /* For c_cpp_error. */
45 #ifndef DOLLARS_IN_IDENTIFIERS
46 # define DOLLARS_IN_IDENTIFIERS true
49 #ifndef TARGET_SYSTEM_ROOT
50 # define TARGET_SYSTEM_ROOT NULL
54 #define TARGET_OPTF(ARG)
58 cpp_options *cpp_opts;
61 static const char *this_input_filename;
63 /* Filename and stream for preprocessed output. */
64 static const char *out_fname;
65 static FILE *out_stream;
67 /* Append dependencies to deps_file. */
68 static bool deps_append;
70 /* If dependency switches (-MF etc.) have been given. */
71 static bool deps_seen;
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 handle_OPT_d (const char *);
110 static void set_std_cxx98 (int);
111 static void set_std_cxx0x (int);
112 static void set_std_c89 (int, int);
113 static void set_std_c99 (int);
114 static void set_std_c1x (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
138 static const unsigned int
139 c_family_lang_mask = (CL_C | CL_CXX | CL_ObjC | CL_ObjCXX);
141 /* Complain that switch CODE expects an argument but none was
142 provided. OPT was the command-line option. Return FALSE to get
143 the default message in opts.c, TRUE if we provide a specialized
146 c_common_missing_argument (const char *opt, size_t code)
151 /* Pick up the default message. */
154 case OPT_fconstant_string_class_:
155 error ("no class name specified with %qs", opt);
159 error ("assertion missing after %qs", opt);
164 error ("macro name missing after %qs", opt);
173 error ("missing path after %qs", opt);
182 error ("missing filename after %qs", opt);
187 error ("missing makefile target after %qs", opt);
194 /* Defer option CODE with argument ARG. */
196 defer_opt (enum opt_code code, const char *arg)
198 deferred_opts[deferred_count].code = code;
199 deferred_opts[deferred_count].arg = arg;
203 /* -Werror= may set a warning option to enable a warning that is emitted
204 by the preprocessor. Set any corresponding flag in cpp_opts. */
207 warning_as_error_callback (int option_index)
209 switch (option_index)
212 /* Ignore options not associated with the preprocessor. */
215 case OPT_Wdeprecated:
216 cpp_opts->warn_deprecated = 1;
221 cpp_opts->warn_comments = 1;
225 cpp_opts->warn_trigraphs = 1;
229 cpp_opts->warn_multichar = 1;
232 case OPT_Wtraditional:
233 cpp_opts->warn_traditional = 1;
237 cpp_opts->warn_long_long = 1;
240 case OPT_Wendif_labels:
241 cpp_opts->warn_endif_labels = 1;
244 case OPT_Wvariadic_macros:
245 /* Set the local flag that is used later to update cpp_opts. */
246 warn_variadic_macros = 1;
249 case OPT_Wbuiltin_macro_redefined:
250 cpp_opts->warn_builtin_macro_redefined = 1;
254 cpp_opts->warn_undef = 1;
257 case OPT_Wunused_macros:
258 /* Set the local flag that is used later to update cpp_opts. */
259 warn_unused_macros = 1;
262 case OPT_Wc___compat:
263 /* Add warnings in the same way as c_common_handle_option below. */
264 if (warn_enum_compare == -1)
265 warn_enum_compare = 1;
266 if (warn_jump_misses_init == -1)
267 warn_jump_misses_init = 1;
268 cpp_opts->warn_cxx_operator_names = 1;
271 case OPT_Wnormalized_:
272 inform (input_location, "-Werror=normalized=: Set -Wnormalized=nfc");
273 cpp_opts->warn_normalize = normalized_C;
276 case OPT_Winvalid_pch:
277 cpp_opts->warn_invalid_pch = 1;
281 /* Handled by standard diagnostics using the option's associated
287 /* Common initialization before parsing options. */
289 c_common_init_options (unsigned int argc, const char **argv)
291 static const unsigned int lang_flags[] = {CL_C, CL_ObjC, CL_CXX, CL_ObjCXX};
292 unsigned int i, result;
293 struct cpp_callbacks *cb;
295 /* Register callback for warnings enabled by -Werror=. */
296 register_warning_as_error_callback (warning_as_error_callback);
298 /* This is conditionalized only because that is the way the front
299 ends used to do it. Maybe this should be unconditional? */
300 if (c_dialect_cxx ())
302 /* By default wrap lines at 80 characters. Is getenv
303 ("COLUMNS") preferable? */
304 diagnostic_line_cutoff (global_dc) = 80;
305 /* By default, emit location information once for every
306 diagnostic message. */
307 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
310 parse_in = cpp_create_reader (c_dialect_cxx () ? CLK_GNUCXX: CLK_GNUC89,
311 ident_hash, line_table);
312 cb = cpp_get_callbacks (parse_in);
313 cb->error = c_cpp_error;
315 cpp_opts = cpp_get_options (parse_in);
316 cpp_opts->dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
317 cpp_opts->objc = c_dialect_objc ();
319 /* Reset to avoid warnings on internal definitions. We set it just
320 before passing on command-line options to cpplib. */
321 cpp_opts->warn_dollars = 0;
323 flag_exceptions = c_dialect_cxx ();
324 warn_pointer_arith = c_dialect_cxx ();
325 warn_write_strings = c_dialect_cxx();
326 flag_warn_unused_result = true;
328 /* By default, C99-like requirements for complex multiply and divide. */
329 flag_complex_method = 2;
331 deferred_opts = XNEWVEC (struct deferred_opt, argc);
333 result = lang_flags[c_language];
335 if (c_language == clk_c)
337 /* If preprocessing assembly language, accept any of the C-family
338 front end options since the driver may pass them through. */
339 for (i = 1; i < argc; i++)
340 if (! strcmp (argv[i], "-lang-asm"))
342 result |= CL_C | CL_ObjC | CL_CXX | CL_ObjCXX;
350 /* Handle switch SCODE with argument ARG. VALUE is true, unless no-
351 form of an -f or -W option was given. Returns 0 if the switch was
352 invalid, a negative number to prevent language-independent
353 processing in toplev.c (a hack necessary for the short-term). */
355 c_common_handle_option (size_t scode, const char *arg, int value,
358 const struct cl_option *option = &cl_options[scode];
359 enum opt_code code = (enum opt_code) scode;
362 /* Prevent resetting the language standard to a C dialect when the driver
363 has already determined that we're looking at assembler input. */
364 bool preprocessing_asm_p = (cpp_get_options (parse_in)->lang == CLK_ASM);
369 if (cl_options[code].flags & c_family_lang_mask)
371 if ((option->flags & CL_TARGET)
372 && ! targetcm.handle_c_option (scode, arg, value))
379 case OPT__output_pch_:
384 defer_opt (code, arg);
388 cpp_opts->discard_comments = 0;
392 cpp_opts->discard_comments = 0;
393 cpp_opts->discard_comments_in_macro_exp = 0;
397 defer_opt (code, arg);
401 flag_preprocess_only = 1;
405 cpp_opts->print_include_names = 1;
409 TARGET_OPTF (xstrdup (arg));
413 if (strcmp (arg, "-"))
414 add_path (xstrdup (arg), BRACKET, 0, true);
417 if (quote_chain_split)
418 error ("-I- specified twice");
419 quote_chain_split = true;
420 split_quote_chain ();
421 inform (input_location, "obsolete option -I- used, please use -iquote instead");
427 /* When doing dependencies with -M or -MM, suppress normal
428 preprocessed output, but still do -dM etc. as software
429 depends on this. Preprocessed output does occur if -MD, -MMD
430 or environment var dependency generation is used. */
431 cpp_opts->deps.style = (code == OPT_M ? DEPS_SYSTEM: DEPS_USER);
437 cpp_opts->deps.style = (code == OPT_MD ? DEPS_SYSTEM: DEPS_USER);
438 cpp_opts->deps.need_preprocessor_output = true;
449 cpp_opts->deps.missing_files = true;
454 cpp_opts->deps.phony_targets = true;
460 defer_opt (code, arg);
464 flag_no_line_commands = 1;
467 case OPT_fworking_directory:
468 flag_working_directory = value;
472 defer_opt (code, arg);
478 handle_option (OPT_Wimplicit, value, NULL, c_family_lang_mask, kind);
479 warn_char_subscripts = value;
480 warn_missing_braces = value;
481 warn_parentheses = value;
482 warn_return_type = value;
483 warn_sequence_point = value; /* Was C only. */
485 if (warn_strict_aliasing == -1)
486 set_Wstrict_aliasing (value);
487 warn_address = value;
488 if (warn_strict_overflow == -1)
489 warn_strict_overflow = value;
490 warn_array_bounds = value;
491 warn_volatile_register_var = value;
493 /* Only warn about unknown pragmas that are not in system
495 warn_unknown_pragmas = value;
497 warn_uninitialized = value;
499 if (!c_dialect_cxx ())
501 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding
502 can turn it off only if it's not explicit. */
504 warn_main = (value ? 2 : 0);
506 /* In C, -Wall turns on -Wenum-compare, which we do here.
507 In C++ it is on by default, which is done in
508 c_common_post_options. */
509 if (warn_enum_compare == -1)
510 warn_enum_compare = value;
514 /* C++-specific warnings. */
515 warn_sign_compare = value;
516 warn_reorder = value;
517 warn_cxx0x_compat = value;
520 cpp_opts->warn_trigraphs = value;
521 cpp_opts->warn_comments = value;
522 cpp_opts->warn_num_sign_change = value;
524 if (warn_pointer_sign == -1)
525 warn_pointer_sign = value;
528 case OPT_Wbuiltin_macro_redefined:
529 cpp_opts->warn_builtin_macro_redefined = value;
534 cpp_opts->warn_comments = value;
537 case OPT_Wc___compat:
538 /* Because -Wenum-compare is the default in C++, -Wc++-compat
539 implies -Wenum-compare. */
540 if (warn_enum_compare == -1 && value)
541 warn_enum_compare = value;
542 /* Because C++ always warns about a goto which misses an
543 initialization, -Wc++-compat turns on -Wjump-misses-init. */
544 if (warn_jump_misses_init == -1 && value)
545 warn_jump_misses_init = value;
546 cpp_opts->warn_cxx_operator_names = value;
549 case OPT_Wdeprecated:
550 cpp_opts->warn_deprecated = value;
553 case OPT_Wendif_labels:
554 cpp_opts->warn_endif_labels = value;
558 global_dc->warning_as_error_requested = value;
561 case OPT_Werror_implicit_function_declaration:
562 /* For backward compatibility, this is the same as
563 -Werror=implicit-function-declaration. */
564 enable_warning_as_error ("implicit-function-declaration", value, CL_C | CL_ObjC);
572 set_Wformat (atoi (arg));
576 gcc_assert (value == 0 || value == 1);
577 if (warn_implicit_int == -1)
578 handle_option (OPT_Wimplicit_int, value, NULL,
579 c_family_lang_mask, kind);
580 if (warn_implicit_function_declaration == -1)
581 handle_option (OPT_Wimplicit_function_declaration, value, NULL,
582 c_family_lang_mask, kind);
586 /* Silently ignore for now. */
589 case OPT_Winvalid_pch:
590 cpp_opts->warn_invalid_pch = value;
593 case OPT_Wmissing_include_dirs:
594 cpp_opts->warn_missing_include_dirs = value;
598 cpp_opts->warn_multichar = value;
601 case OPT_Wnormalized_:
602 if (!value || (arg && strcasecmp (arg, "none") == 0))
603 cpp_opts->warn_normalize = normalized_none;
604 else if (!arg || strcasecmp (arg, "nfkc") == 0)
605 cpp_opts->warn_normalize = normalized_KC;
606 else if (strcasecmp (arg, "id") == 0)
607 cpp_opts->warn_normalize = normalized_identifier_C;
608 else if (strcasecmp (arg, "nfc") == 0)
609 cpp_opts->warn_normalize = normalized_C;
611 error ("argument %qs to %<-Wnormalized%> not recognized", arg);
614 case OPT_Wreturn_type:
615 warn_return_type = value;
618 case OPT_Wstrict_null_sentinel:
619 warn_strict_null_sentinel = value;
622 case OPT_Wtraditional:
623 cpp_opts->warn_traditional = value;
627 cpp_opts->warn_trigraphs = value;
631 cpp_opts->warn_undef = value;
634 case OPT_Wunknown_pragmas:
635 /* Set to greater than 1, so that even unknown pragmas in
636 system headers will be warned about. */
637 warn_unknown_pragmas = value * 2;
640 case OPT_Wunused_macros:
641 warn_unused_macros = value;
644 case OPT_Wvariadic_macros:
645 warn_variadic_macros = value;
648 case OPT_Wwrite_strings:
649 warn_write_strings = value;
655 warn_nonvdtor = true;
659 if (!c_dialect_cxx ())
660 set_std_c89 (false, true);
662 set_std_cxx98 (true);
669 case OPT_fcond_mismatch:
670 if (!c_dialect_cxx ())
672 flag_cond_mismatch = value;
677 case OPT_fall_virtual:
678 case OPT_falt_external_templates:
679 case OPT_fenum_int_equiv:
680 case OPT_fexternal_templates:
681 case OPT_fguiding_decls:
683 case OPT_fhuge_objects:
685 case OPT_fname_mangling_version_:
687 case OPT_fnonnull_objects:
689 case OPT_fstrict_prototype:
690 case OPT_fthis_is_variable:
691 case OPT_fvtable_thunks:
694 warning (0, "switch %qs is no longer supported", option->opt_text);
697 case OPT_faccess_control:
698 flag_access_control = value;
702 flag_no_asm = !value;
706 flag_no_builtin = !value;
713 disable_builtin_function (arg);
716 case OPT_fdirectives_only:
717 cpp_opts->directives_only = value;
720 case OPT_fdollars_in_identifiers:
721 cpp_opts->dollars_in_ident = value;
724 case OPT_ffreestanding:
726 /* Fall through.... */
729 flag_no_builtin = !value;
732 case OPT_fshort_double:
733 flag_short_double = value;
736 case OPT_fshort_enums:
737 flag_short_enums = value;
740 case OPT_fshort_wchar:
741 flag_short_wchar = value;
744 case OPT_fsigned_bitfields:
745 flag_signed_bitfields = value;
748 case OPT_fsigned_char:
749 flag_signed_char = value;
752 case OPT_funsigned_bitfields:
753 flag_signed_bitfields = !value;
756 case OPT_funsigned_char:
757 flag_signed_char = !value;
761 flag_check_new = value;
764 case OPT_fconserve_space:
765 flag_conserve_space = value;
768 case OPT_fconstant_string_class_:
769 constant_string_class_name = arg;
772 case OPT_fdefault_inline:
773 flag_default_inline = value;
776 case OPT_felide_constructors:
777 flag_elide_constructors = value;
780 case OPT_fenforce_eh_specs:
781 flag_enforce_eh_specs = value;
784 case OPT_fextended_identifiers:
785 cpp_opts->extended_identifiers = value;
789 flag_new_for_scope = value;
792 case OPT_fgnu_keywords:
793 flag_no_gnu_keywords = !value;
796 case OPT_fgnu_runtime:
797 flag_next_runtime = !value;
800 case OPT_fhandle_exceptions:
801 warning (0, "-fhandle-exceptions has been renamed -fexceptions (and is now on by default)");
802 flag_exceptions = value;
805 case OPT_fimplement_inlines:
806 flag_implement_inlines = value;
809 case OPT_fimplicit_inline_templates:
810 flag_implicit_inline_templates = value;
813 case OPT_fimplicit_templates:
814 flag_implicit_templates = value;
817 case OPT_flax_vector_conversions:
818 flag_lax_vector_conversions = value;
821 case OPT_fms_extensions:
822 flag_ms_extensions = value;
825 case OPT_fnext_runtime:
826 flag_next_runtime = value;
829 case OPT_fnil_receivers:
830 flag_nil_receivers = value;
833 case OPT_fnonansi_builtins:
834 flag_no_nonansi_builtin = !value;
837 case OPT_foperator_names:
838 cpp_opts->operator_names = value;
841 case OPT_foptional_diags:
842 flag_optional_diags = value;
846 cpp_opts->restore_pch_deps = value;
849 case OPT_fpch_preprocess:
850 flag_pch_preprocess = value;
853 case OPT_fpermissive:
854 flag_permissive = value;
857 case OPT_fpreprocessed:
858 cpp_opts->preprocessed = value;
861 case OPT_freplace_objc_classes:
862 flag_replace_objc_classes = value;
866 flag_use_repository = value;
868 flag_implicit_templates = 0;
875 case OPT_fshow_column:
876 cpp_opts->show_column = value;
880 flag_detailed_statistics = value;
884 /* It is documented that we silently ignore silly values. */
885 if (value >= 1 && value <= 100)
886 cpp_opts->tabstop = value;
889 case OPT_fexec_charset_:
890 cpp_opts->narrow_charset = arg;
893 case OPT_fwide_exec_charset_:
894 cpp_opts->wide_charset = arg;
897 case OPT_finput_charset_:
898 cpp_opts->input_charset = arg;
901 case OPT_ftemplate_depth_:
902 /* Kept for backwards compatibility. */
903 case OPT_ftemplate_depth_eq:
904 max_tinst_depth = value;
907 case OPT_fuse_cxa_atexit:
908 flag_use_cxa_atexit = value;
911 case OPT_fuse_cxa_get_exception_ptr:
912 flag_use_cxa_get_exception_ptr = value;
915 case OPT_fvisibility_inlines_hidden:
916 visibility_options.inlines_hidden = value;
923 case OPT_fthreadsafe_statics:
924 flag_threadsafe_statics = value;
927 case OPT_fpretty_templates:
928 flag_pretty_templates = value;
932 flag_zero_link = value;
936 flag_gen_declaration = 1;
939 case OPT_femit_struct_debug_baseonly:
940 set_struct_debug_option ("base");
943 case OPT_femit_struct_debug_reduced:
944 set_struct_debug_option ("dir:ord:sys,dir:gen:any,ind:base");
947 case OPT_femit_struct_debug_detailed_:
948 set_struct_debug_option (arg);
952 add_path (xstrdup (arg), AFTER, 0, true);
957 defer_opt (code, arg);
969 add_path (xstrdup (arg), QUOTE, 0, true);
977 add_path (xstrdup (arg), SYSTEM, 0, true);
980 case OPT_iwithprefix:
981 add_prefixed_path (arg, SYSTEM);
984 case OPT_iwithprefixbefore:
985 add_prefixed_path (arg, BRACKET);
989 cpp_set_lang (parse_in, CLK_ASM);
990 cpp_opts->dollars_in_ident = false;
1001 case OPT_nostdinc__:
1002 std_cxx_inc = false;
1009 error ("output filename specified twice");
1012 /* We need to handle the -pedantic switches here, rather than in
1013 c_common_post_options, so that a subsequent -Wno-endif-labels
1014 is not overridden. */
1015 case OPT_pedantic_errors:
1017 cpp_opts->pedantic = 1;
1018 cpp_opts->warn_endif_labels = 1;
1019 if (warn_pointer_sign == -1)
1020 warn_pointer_sign = 1;
1021 if (warn_overlength_strings == -1)
1022 warn_overlength_strings = 1;
1023 if (warn_main == -1)
1027 case OPT_print_objc_runtime_info:
1028 print_struct_values = 1;
1031 case OPT_print_pch_checksum:
1032 c_common_print_pch_checksum (stdout);
1033 exit_after_options = true;
1037 cpp_opts->remap = 1;
1041 case OPT_std_gnu__98:
1042 if (!preprocessing_asm_p)
1043 set_std_cxx98 (code == OPT_std_c__98 /* ISO */);
1047 case OPT_std_gnu__0x:
1048 if (!preprocessing_asm_p)
1049 set_std_cxx0x (code == OPT_std_c__0x /* ISO */);
1054 case OPT_std_iso9899_1990:
1055 case OPT_std_iso9899_199409:
1056 if (!preprocessing_asm_p)
1057 set_std_c89 (code == OPT_std_iso9899_199409 /* c94 */, true /* ISO */);
1062 if (!preprocessing_asm_p)
1063 set_std_c89 (false /* c94 */, false /* ISO */);
1068 case OPT_std_iso9899_1999:
1069 case OPT_std_iso9899_199x:
1070 if (!preprocessing_asm_p)
1071 set_std_c99 (true /* ISO */);
1076 if (!preprocessing_asm_p)
1077 set_std_c99 (false /* ISO */);
1081 if (!preprocessing_asm_p)
1082 set_std_c1x (true /* ISO */);
1086 if (!preprocessing_asm_p)
1087 set_std_c1x (false /* ISO */);
1091 cpp_opts->trigraphs = 1;
1094 case OPT_traditional_cpp:
1095 cpp_opts->traditional = 1;
1114 /* Post-switch processing. */
1116 c_common_post_options (const char **pfilename)
1118 struct cpp_callbacks *cb;
1120 /* Canonicalize the input and output filenames. */
1121 if (in_fnames == NULL)
1123 in_fnames = XNEWVEC (const char *, 1);
1126 else if (strcmp (in_fnames[0], "-") == 0)
1129 if (out_fname == NULL || !strcmp (out_fname, "-"))
1132 if (cpp_opts->deps.style == DEPS_NONE)
1133 check_deps_environment_vars ();
1135 handle_deferred_opts ();
1137 sanitize_cpp_opts ();
1139 register_include_chains (parse_in, sysroot, iprefix, imultilib,
1140 std_inc, std_cxx_inc && c_dialect_cxx (), verbose);
1142 #ifdef C_COMMON_OVERRIDE_OPTIONS
1143 /* Some machines may reject certain combinations of C
1144 language-specific options. */
1145 C_COMMON_OVERRIDE_OPTIONS;
1148 /* Excess precision other than "fast" requires front-end
1150 if (c_dialect_cxx ())
1152 if (flag_excess_precision_cmdline == EXCESS_PRECISION_STANDARD
1153 && TARGET_FLT_EVAL_METHOD_NON_DEFAULT)
1154 sorry ("-fexcess-precision=standard for C++");
1155 flag_excess_precision_cmdline = EXCESS_PRECISION_FAST;
1157 else if (flag_excess_precision_cmdline == EXCESS_PRECISION_DEFAULT)
1158 flag_excess_precision_cmdline = (flag_iso
1159 ? EXCESS_PRECISION_STANDARD
1160 : EXCESS_PRECISION_FAST);
1162 /* By default we use C99 inline semantics in GNU99 or C99 mode. C99
1163 inline semantics are not supported in GNU89 or C89 mode. */
1164 if (flag_gnu89_inline == -1)
1165 flag_gnu89_inline = !flag_isoc99;
1166 else if (!flag_gnu89_inline && !flag_isoc99)
1167 error ("-fno-gnu89-inline is only supported in GNU99 or C99 mode");
1169 /* Default to ObjC sjlj exception handling if NeXT runtime. */
1170 if (flag_objc_sjlj_exceptions < 0)
1171 flag_objc_sjlj_exceptions = flag_next_runtime;
1172 if (flag_objc_exceptions && !flag_objc_sjlj_exceptions)
1173 flag_exceptions = 1;
1175 /* -Wextra implies the following flags
1176 unless explicitly overridden. */
1177 if (warn_type_limits == -1)
1178 warn_type_limits = extra_warnings;
1179 if (warn_clobbered == -1)
1180 warn_clobbered = extra_warnings;
1181 if (warn_empty_body == -1)
1182 warn_empty_body = extra_warnings;
1183 if (warn_sign_compare == -1)
1184 warn_sign_compare = extra_warnings;
1185 if (warn_missing_field_initializers == -1)
1186 warn_missing_field_initializers = extra_warnings;
1187 if (warn_missing_parameter_type == -1)
1188 warn_missing_parameter_type = extra_warnings;
1189 if (warn_old_style_declaration == -1)
1190 warn_old_style_declaration = extra_warnings;
1191 if (warn_override_init == -1)
1192 warn_override_init = extra_warnings;
1193 if (warn_ignored_qualifiers == -1)
1194 warn_ignored_qualifiers = extra_warnings;
1196 /* -Wpointer-sign is disabled by default, but it is enabled if any
1197 of -Wall or -pedantic are given. */
1198 if (warn_pointer_sign == -1)
1199 warn_pointer_sign = 0;
1201 if (warn_strict_aliasing == -1)
1202 warn_strict_aliasing = 0;
1203 if (warn_strict_overflow == -1)
1204 warn_strict_overflow = 0;
1205 if (warn_jump_misses_init == -1)
1206 warn_jump_misses_init = 0;
1208 /* -Woverlength-strings is off by default, but is enabled by -pedantic.
1209 It is never enabled in C++, as the minimum limit is not normative
1210 in that standard. */
1211 if (warn_overlength_strings == -1 || c_dialect_cxx ())
1212 warn_overlength_strings = 0;
1214 /* Wmain is enabled by default in C++ but not in C. */
1215 /* Wmain is disabled by default for -ffreestanding (!flag_hosted),
1216 even if -Wall was given (warn_main will be 2 if set by -Wall, 1
1217 if set by -Wmain). */
1218 if (warn_main == -1)
1219 warn_main = (c_dialect_cxx () && flag_hosted) ? 1 : 0;
1220 else if (warn_main == 2)
1221 warn_main = flag_hosted ? 1 : 0;
1223 /* In C, -Wconversion enables -Wsign-conversion (unless disabled
1224 through -Wno-sign-conversion). While in C++,
1225 -Wsign-conversion needs to be requested explicitly. */
1226 if (warn_sign_conversion == -1)
1227 warn_sign_conversion = (c_dialect_cxx ()) ? 0 : warn_conversion;
1229 /* In C, -Wall and -Wc++-compat enable -Wenum-compare, which we do
1230 in c_common_handle_option; if it has not yet been set, it is
1231 disabled by default. In C++, it is enabled by default. */
1232 if (warn_enum_compare == -1)
1233 warn_enum_compare = c_dialect_cxx () ? 1 : 0;
1235 /* -Wpacked-bitfield-compat is on by default for the C languages. The
1236 warning is issued in stor-layout.c which is not part of the front-end so
1237 we need to selectively turn it on here. */
1238 if (warn_packed_bitfield_compat == -1)
1239 warn_packed_bitfield_compat = 1;
1241 /* Special format checking options don't work without -Wformat; warn if
1245 warning (OPT_Wformat_y2k,
1246 "-Wformat-y2k ignored without -Wformat");
1247 warning (OPT_Wformat_extra_args,
1248 "-Wformat-extra-args ignored without -Wformat");
1249 warning (OPT_Wformat_zero_length,
1250 "-Wformat-zero-length ignored without -Wformat");
1251 warning (OPT_Wformat_nonliteral,
1252 "-Wformat-nonliteral ignored without -Wformat");
1253 warning (OPT_Wformat_contains_nul,
1254 "-Wformat-contains-nul ignored without -Wformat");
1255 warning (OPT_Wformat_security,
1256 "-Wformat-security ignored without -Wformat");
1259 if (warn_implicit == -1)
1262 if (warn_implicit_int == -1)
1263 warn_implicit_int = 0;
1265 /* -Wimplicit-function-declaration is enabled by default for C99. */
1266 if (warn_implicit_function_declaration == -1)
1267 warn_implicit_function_declaration = flag_isoc99;
1269 /* If we're allowing C++0x constructs, don't warn about C++0x
1270 compatibility problems. */
1271 if (cxx_dialect == cxx0x)
1272 warn_cxx0x_compat = 0;
1274 if (flag_preprocess_only)
1276 /* Open the output now. We must do so even if flag_no_output is
1277 on, because there may be other output than from the actual
1278 preprocessing (e.g. from -dM). */
1279 if (out_fname[0] == '\0')
1280 out_stream = stdout;
1282 out_stream = fopen (out_fname, "w");
1284 if (out_stream == NULL)
1286 fatal_error ("opening output file %s: %m", out_fname);
1290 if (num_in_fnames > 1)
1291 error ("too many filenames given. Type %s --help for usage",
1294 init_pp_output (out_stream);
1300 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1301 input_location = UNKNOWN_LOCATION;
1304 cb = cpp_get_callbacks (parse_in);
1305 cb->file_change = cb_file_change;
1306 cb->dir_change = cb_dir_change;
1307 cpp_post_options (parse_in);
1309 input_location = UNKNOWN_LOCATION;
1311 *pfilename = this_input_filename
1312 = cpp_read_main_file (parse_in, in_fnames[0]);
1313 /* Don't do any compilation or preprocessing if there is no input file. */
1314 if (this_input_filename == NULL)
1320 if (flag_working_directory
1321 && flag_preprocess_only && !flag_no_line_commands)
1322 pp_dir_change (parse_in, get_src_pwd ());
1324 return flag_preprocess_only;
1327 /* Front end initialization common to C, ObjC and C++. */
1329 c_common_init (void)
1331 /* Set up preprocessor arithmetic. Must be done after call to
1332 c_common_nodes_and_builtins for type nodes to be good. */
1333 cpp_opts->precision = TYPE_PRECISION (intmax_type_node);
1334 cpp_opts->char_precision = TYPE_PRECISION (char_type_node);
1335 cpp_opts->int_precision = TYPE_PRECISION (integer_type_node);
1336 cpp_opts->wchar_precision = TYPE_PRECISION (wchar_type_node);
1337 cpp_opts->unsigned_wchar = TYPE_UNSIGNED (wchar_type_node);
1338 cpp_opts->bytes_big_endian = BYTES_BIG_ENDIAN;
1340 /* This can't happen until after wchar_precision and bytes_big_endian
1342 cpp_init_iconv (parse_in);
1345 c_common_print_pch_checksum (stderr);
1347 /* Has to wait until now so that cpplib has its hash table. */
1350 if (flag_preprocess_only)
1353 preprocess_file (parse_in);
1360 /* Initialize the integrated preprocessor after debug output has been
1361 initialized; loop over each input file. */
1363 c_common_parse_file (int set_yydebug)
1371 warning(0, "The C parser does not support -dy, option ignored");
1375 "The Objective-C parser does not support -dy, option ignored");
1378 warning(0, "The C++ parser does not support -dy, option ignored");
1382 "The Objective-C++ parser does not support -dy, option ignored");
1397 /* And end the main input file, if the debug writer wants it */
1398 if (debug_hooks->start_end_main_source_file)
1399 (*debug_hooks->end_source_file) (0);
1400 if (++i >= num_in_fnames)
1402 cpp_undef_all (parse_in);
1403 cpp_clear_file_cache (parse_in);
1405 = cpp_read_main_file (parse_in, in_fnames[i]);
1406 /* If an input file is missing, abandon further compilation.
1407 cpplib has issued a diagnostic. */
1408 if (!this_input_filename)
1413 /* Common finish hook for the C, ObjC and C++ front ends. */
1415 c_common_finish (void)
1417 FILE *deps_stream = NULL;
1419 /* Don't write the deps file if there are errors. */
1420 if (cpp_opts->deps.style != DEPS_NONE && errorcount == 0)
1422 /* If -M or -MM was seen without -MF, default output to the
1425 deps_stream = out_stream;
1428 deps_stream = fopen (deps_file, deps_append ? "a": "w");
1430 fatal_error ("opening dependency file %s: %m", deps_file);
1434 /* For performance, avoid tearing down cpplib's internal structures
1435 with cpp_destroy (). */
1436 cpp_finish (parse_in, deps_stream);
1438 if (deps_stream && deps_stream != out_stream
1439 && (ferror (deps_stream) || fclose (deps_stream)))
1440 fatal_error ("closing dependency file %s: %m", deps_file);
1442 if (out_stream && (ferror (out_stream) || fclose (out_stream)))
1443 fatal_error ("when writing output to %s: %m", out_fname);
1446 /* Either of two environment variables can specify output of
1447 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1448 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1449 and DEPS_TARGET is the target to mention in the deps. They also
1450 result in dependency information being appended to the output file
1451 rather than overwriting it, and like Sun's compiler
1452 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1454 check_deps_environment_vars (void)
1458 GET_ENVIRONMENT (spec, "DEPENDENCIES_OUTPUT");
1460 cpp_opts->deps.style = DEPS_USER;
1463 GET_ENVIRONMENT (spec, "SUNPRO_DEPENDENCIES");
1466 cpp_opts->deps.style = DEPS_SYSTEM;
1467 cpp_opts->deps.ignore_main_file = true;
1473 /* Find the space before the DEPS_TARGET, if there is one. */
1474 char *s = strchr (spec, ' ');
1477 /* Let the caller perform MAKE quoting. */
1478 defer_opt (OPT_MT, s + 1);
1482 /* Command line -MF overrides environment variables and default. */
1491 /* Handle deferred command line switches. */
1493 handle_deferred_opts (void)
1498 /* Avoid allocating the deps buffer if we don't need it.
1499 (This flag may be true without there having been -MT or -MQ
1500 options, but we'll still need the deps buffer.) */
1504 deps = cpp_get_deps (parse_in);
1506 for (i = 0; i < deferred_count; i++)
1508 struct deferred_opt *opt = &deferred_opts[i];
1510 if (opt->code == OPT_MT || opt->code == OPT_MQ)
1511 deps_add_target (deps, opt->arg, opt->code == OPT_MQ);
1515 /* These settings are appropriate for GCC, but not necessarily so for
1516 cpplib as a library. */
1518 sanitize_cpp_opts (void)
1520 /* If we don't know what style of dependencies to output, complain
1521 if any other dependency switches have been given. */
1522 if (deps_seen && cpp_opts->deps.style == DEPS_NONE)
1523 error ("to generate dependencies you must specify either -M or -MM");
1525 /* -dM and dependencies suppress normal output; do it here so that
1526 the last -d[MDN] switch overrides earlier ones. */
1527 if (flag_dump_macros == 'M')
1530 /* By default, -fdirectives-only implies -dD. This allows subsequent phases
1531 to perform proper macro expansion. */
1532 if (cpp_opts->directives_only && !cpp_opts->preprocessed && !flag_dump_macros)
1533 flag_dump_macros = 'D';
1535 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1536 -dM since at least glibc relies on -M -dM to work. */
1537 /* Also, flag_no_output implies flag_no_line_commands, always. */
1540 if (flag_dump_macros != 'M')
1541 flag_dump_macros = 0;
1542 flag_dump_includes = 0;
1543 flag_no_line_commands = 1;
1545 else if (cpp_opts->deps.missing_files)
1546 error ("-MG may only be used with -M or -MM");
1548 cpp_opts->unsigned_char = !flag_signed_char;
1549 cpp_opts->stdc_0_in_system_headers = STDC_0_IN_SYSTEM_HEADERS;
1551 /* Wlong-long is disabled by default. It is enabled by:
1552 [-pedantic | -Wtraditional] -std=[gnu|c]++98 ; or
1553 [-pedantic | -Wtraditional] -std=non-c99 .
1555 Either -Wlong-long or -Wno-long-long override any other settings. */
1556 if (warn_long_long == -1)
1557 warn_long_long = ((pedantic || warn_traditional)
1558 && (c_dialect_cxx () ? cxx_dialect == cxx98 : !flag_isoc99));
1559 cpp_opts->warn_long_long = warn_long_long;
1561 /* Similarly with -Wno-variadic-macros. No check for c99 here, since
1562 this also turns off warnings about GCCs extension. */
1563 cpp_opts->warn_variadic_macros
1564 = warn_variadic_macros && (pedantic || warn_traditional);
1566 /* If we're generating preprocessor output, emit current directory
1567 if explicitly requested or if debugging information is enabled.
1568 ??? Maybe we should only do it for debugging formats that
1569 actually output the current directory? */
1570 if (flag_working_directory == -1)
1571 flag_working_directory = (debug_info_level != DINFO_LEVEL_NONE);
1573 if (cpp_opts->directives_only)
1575 if (warn_unused_macros)
1576 error ("-fdirectives-only is incompatible with -Wunused_macros");
1577 if (cpp_opts->traditional)
1578 error ("-fdirectives-only is incompatible with -traditional");
1582 /* Add include path with a prefix at the front of its name. */
1584 add_prefixed_path (const char *suffix, size_t chain)
1588 size_t prefix_len, suffix_len;
1590 suffix_len = strlen (suffix);
1591 prefix = iprefix ? iprefix : cpp_GCC_INCLUDE_DIR;
1592 prefix_len = iprefix ? strlen (iprefix) : cpp_GCC_INCLUDE_DIR_len;
1594 path = (char *) xmalloc (prefix_len + suffix_len + 1);
1595 memcpy (path, prefix, prefix_len);
1596 memcpy (path + prefix_len, suffix, suffix_len);
1597 path[prefix_len + suffix_len] = '\0';
1599 add_path (path, chain, 0, false);
1602 /* Handle -D, -U, -A, -imacros, and the first -include. */
1604 finish_options (void)
1606 if (!cpp_opts->preprocessed)
1610 cb_file_change (parse_in,
1611 linemap_add (line_table, LC_RENAME, 0,
1612 _("<built-in>"), 0));
1614 cpp_init_builtins (parse_in, flag_hosted);
1615 c_cpp_builtins (parse_in);
1617 /* We're about to send user input to cpplib, so make it warn for
1618 things that we previously (when we sent it internal definitions)
1619 told it to not warn.
1621 C99 permits implementation-defined characters in identifiers.
1622 The documented meaning of -std= is to turn off extensions that
1623 conflict with the specified standard, and since a strictly
1624 conforming program cannot contain a '$', we do not condition
1625 their acceptance on the -std= setting. */
1626 cpp_opts->warn_dollars = (cpp_opts->pedantic && !cpp_opts->c99);
1628 cb_file_change (parse_in,
1629 linemap_add (line_table, LC_RENAME, 0,
1630 _("<command-line>"), 0));
1632 for (i = 0; i < deferred_count; i++)
1634 struct deferred_opt *opt = &deferred_opts[i];
1636 if (opt->code == OPT_D)
1637 cpp_define (parse_in, opt->arg);
1638 else if (opt->code == OPT_U)
1639 cpp_undef (parse_in, opt->arg);
1640 else if (opt->code == OPT_A)
1642 if (opt->arg[0] == '-')
1643 cpp_unassert (parse_in, opt->arg + 1);
1645 cpp_assert (parse_in, opt->arg);
1649 /* Start the main input file, if the debug writer wants it. */
1650 if (debug_hooks->start_end_main_source_file
1651 && !flag_preprocess_only)
1652 (*debug_hooks->start_source_file) (0, this_input_filename);
1654 /* Handle -imacros after -D and -U. */
1655 for (i = 0; i < deferred_count; i++)
1657 struct deferred_opt *opt = &deferred_opts[i];
1659 if (opt->code == OPT_imacros
1660 && cpp_push_include (parse_in, opt->arg))
1662 /* Disable push_command_line_include callback for now. */
1663 include_cursor = deferred_count + 1;
1664 cpp_scan_nooutput (parse_in);
1670 if (cpp_opts->directives_only)
1671 cpp_init_special_builtins (parse_in);
1673 /* Start the main input file, if the debug writer wants it. */
1674 if (debug_hooks->start_end_main_source_file
1675 && !flag_preprocess_only)
1676 (*debug_hooks->start_source_file) (0, this_input_filename);
1680 push_command_line_include ();
1683 /* Give CPP the next file given by -include, if any. */
1685 push_command_line_include (void)
1687 while (include_cursor < deferred_count)
1689 struct deferred_opt *opt = &deferred_opts[include_cursor++];
1691 if (!cpp_opts->preprocessed && opt->code == OPT_include
1692 && cpp_push_include (parse_in, opt->arg))
1696 if (include_cursor == deferred_count)
1699 /* -Wunused-macros should only warn about macros defined hereafter. */
1700 cpp_opts->warn_unused_macros = warn_unused_macros;
1701 /* Restore the line map from <command line>. */
1702 if (!cpp_opts->preprocessed)
1703 cpp_change_file (parse_in, LC_RENAME, this_input_filename);
1705 /* Set this here so the client can change the option if it wishes,
1706 and after stacking the main file so we don't trace the main file. */
1707 line_table->trace_includes = cpp_opts->print_include_names;
1711 /* File change callback. Has to handle -include files. */
1713 cb_file_change (cpp_reader * ARG_UNUSED (pfile),
1714 const struct line_map *new_map)
1716 if (flag_preprocess_only)
1717 pp_file_change (new_map);
1719 fe_file_change (new_map);
1721 if (new_map == 0 || (new_map->reason == LC_LEAVE && MAIN_FILE_P (new_map)))
1722 push_command_line_include ();
1726 cb_dir_change (cpp_reader * ARG_UNUSED (pfile), const char *dir)
1728 if (!set_src_pwd (dir))
1729 warning (0, "too late for # directive to set debug directory");
1732 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1733 extensions if ISO). There is no concept of gnu94. */
1735 set_std_c89 (int c94, int iso)
1737 cpp_set_lang (parse_in, c94 ? CLK_STDC94: iso ? CLK_STDC89: CLK_GNUC89);
1740 flag_no_gnu_keywords = iso;
1741 flag_no_nonansi_builtin = iso;
1747 /* Set the C 99 standard (without GNU extensions if ISO). */
1749 set_std_c99 (int iso)
1751 cpp_set_lang (parse_in, iso ? CLK_STDC99: CLK_GNUC99);
1753 flag_no_nonansi_builtin = iso;
1760 /* Set the C 1X standard draft (without GNU extensions if ISO). */
1762 set_std_c1x (int iso)
1764 cpp_set_lang (parse_in, iso ? CLK_STDC1X: CLK_GNUC1X);
1766 flag_no_nonansi_builtin = iso;
1773 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1775 set_std_cxx98 (int iso)
1777 cpp_set_lang (parse_in, iso ? CLK_CXX98: CLK_GNUCXX);
1778 flag_no_gnu_keywords = iso;
1779 flag_no_nonansi_builtin = iso;
1781 cxx_dialect = cxx98;
1784 /* Set the C++ 0x working draft "standard" (without GNU extensions if ISO). */
1786 set_std_cxx0x (int iso)
1788 cpp_set_lang (parse_in, iso ? CLK_CXX0X: CLK_GNUCXX0X);
1789 flag_no_gnu_keywords = iso;
1790 flag_no_nonansi_builtin = iso;
1792 cxx_dialect = cxx0x;
1795 /* Args to -d specify what to dump. Silently ignore
1796 unrecognized options; they may be aimed at toplev.c. */
1798 handle_OPT_d (const char *arg)
1802 while ((c = *arg++) != '\0')
1805 case 'M': /* Dump macros only. */
1806 case 'N': /* Dump names. */
1807 case 'D': /* Dump definitions. */
1808 case 'U': /* Dump used macros. */
1809 flag_dump_macros = c;
1813 flag_dump_includes = 1;