1 /* C/ObjC/C++ command line option handling.
2 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
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. */
44 #ifndef DOLLARS_IN_IDENTIFIERS
45 # define DOLLARS_IN_IDENTIFIERS true
48 #ifndef TARGET_SYSTEM_ROOT
49 # define TARGET_SYSTEM_ROOT NULL
53 #define TARGET_OPTF(ARG)
57 cpp_options *cpp_opts;
60 static const char *this_input_filename;
62 /* Filename and stream for preprocessed output. */
63 static const char *out_fname;
64 static FILE *out_stream;
66 /* Append dependencies to deps_file. */
67 static bool deps_append;
69 /* If dependency switches (-MF etc.) have been given. */
70 static bool deps_seen;
75 /* Dependency output file. */
76 static const char *deps_file;
78 /* The prefix given by -iprefix, if any. */
79 static const char *iprefix;
81 /* The multilib directory given by -imultilib, if any. */
82 static const char *imultilib;
84 /* The system root, if any. Overridden by -isysroot. */
85 static const char *sysroot = TARGET_SYSTEM_ROOT;
87 /* Zero disables all standard directories for headers. */
88 static bool std_inc = true;
90 /* Zero disables the C++-specific standard directories for headers. */
91 static bool std_cxx_inc = true;
93 /* If the quote chain has been split by -I-. */
94 static bool quote_chain_split;
96 /* If -Wunused-macros. */
97 static bool warn_unused_macros;
99 /* If -Wvariadic-macros. */
100 static bool warn_variadic_macros = true;
102 /* Number of deferred options. */
103 static size_t deferred_count;
105 /* Number of deferred options scanned for -include. */
106 static size_t include_cursor;
108 static void set_Wimplicit (int);
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 check_deps_environment_vars (void);
115 static void handle_deferred_opts (void);
116 static void sanitize_cpp_opts (void);
117 static void add_prefixed_path (const char *, size_t);
118 static void push_command_line_include (void);
119 static void cb_file_change (cpp_reader *, const struct line_map *);
120 static void cb_dir_change (cpp_reader *, const char *);
121 static void finish_options (void);
123 #ifndef STDC_0_IN_SYSTEM_HEADERS
124 #define STDC_0_IN_SYSTEM_HEADERS 0
127 /* Holds switches parsed by c_common_handle_option (), but whose
128 handling is deferred to c_common_post_options (). */
129 static void defer_opt (enum opt_code, const char *);
130 static struct deferred_opt
136 /* Complain that switch CODE expects an argument but none was
137 provided. OPT was the command-line option. Return FALSE to get
138 the default message in opts.c, TRUE if we provide a specialized
141 c_common_missing_argument (const char *opt, size_t code)
146 /* Pick up the default message. */
149 case OPT_fconstant_string_class_:
150 error ("no class name specified with %qs", opt);
154 error ("assertion missing after %qs", opt);
159 error ("macro name missing after %qs", opt);
168 error ("missing path after %qs", opt);
177 error ("missing filename after %qs", opt);
182 error ("missing makefile target after %qs", opt);
189 /* Defer option CODE with argument ARG. */
191 defer_opt (enum opt_code code, const char *arg)
193 deferred_opts[deferred_count].code = code;
194 deferred_opts[deferred_count].arg = arg;
198 /* Common initialization before parsing options. */
200 c_common_init_options (unsigned int argc, const char **argv)
202 static const unsigned int lang_flags[] = {CL_C, CL_ObjC, CL_CXX, CL_ObjCXX};
203 unsigned int i, result;
205 /* This is conditionalized only because that is the way the front
206 ends used to do it. Maybe this should be unconditional? */
207 if (c_dialect_cxx ())
209 /* By default wrap lines at 80 characters. Is getenv
210 ("COLUMNS") preferable? */
211 diagnostic_line_cutoff (global_dc) = 80;
212 /* By default, emit location information once for every
213 diagnostic message. */
214 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
217 parse_in = cpp_create_reader (c_dialect_cxx () ? CLK_GNUCXX: CLK_GNUC89,
218 ident_hash, line_table);
220 cpp_opts = cpp_get_options (parse_in);
221 cpp_opts->dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
222 cpp_opts->objc = c_dialect_objc ();
224 /* Reset to avoid warnings on internal definitions. We set it just
225 before passing on command-line options to cpplib. */
226 cpp_opts->warn_dollars = 0;
228 flag_exceptions = c_dialect_cxx ();
229 warn_pointer_arith = c_dialect_cxx ();
230 warn_write_strings = c_dialect_cxx();
232 /* By default, C99-like requirements for complex multiply and divide. */
233 flag_complex_method = 2;
235 deferred_opts = XNEWVEC (struct deferred_opt, argc);
237 result = lang_flags[c_language];
239 if (c_language == clk_c)
241 /* If preprocessing assembly language, accept any of the C-family
242 front end options since the driver may pass them through. */
243 for (i = 1; i < argc; i++)
244 if (! strcmp (argv[i], "-lang-asm"))
246 result |= CL_C | CL_ObjC | CL_CXX | CL_ObjCXX;
254 /* Handle switch SCODE with argument ARG. VALUE is true, unless no-
255 form of an -f or -W option was given. Returns 0 if the switch was
256 invalid, a negative number to prevent language-independent
257 processing in toplev.c (a hack necessary for the short-term). */
259 c_common_handle_option (size_t scode, const char *arg, int value)
261 const struct cl_option *option = &cl_options[scode];
262 enum opt_code code = (enum opt_code) scode;
265 /* Prevent resetting the language standard to a C dialect when the driver
266 has already determined that we're looking at assembler input. */
267 bool preprocessing_asm_p = (cpp_get_options (parse_in)->lang == CLK_ASM);
272 if (cl_options[code].flags & (CL_C | CL_CXX | CL_ObjC | CL_ObjCXX))
274 if ((option->flags & CL_TARGET)
275 && ! targetcm.handle_c_option (scode, arg, value))
282 case OPT__output_pch_:
287 defer_opt (code, arg);
291 cpp_opts->discard_comments = 0;
295 cpp_opts->discard_comments = 0;
296 cpp_opts->discard_comments_in_macro_exp = 0;
300 defer_opt (code, arg);
304 flag_preprocess_only = 1;
308 cpp_opts->print_include_names = 1;
312 TARGET_OPTF (xstrdup (arg));
316 if (strcmp (arg, "-"))
317 add_path (xstrdup (arg), BRACKET, 0, true);
320 if (quote_chain_split)
321 error ("-I- specified twice");
322 quote_chain_split = true;
323 split_quote_chain ();
324 inform (input_location, "obsolete option -I- used, please use -iquote instead");
330 /* When doing dependencies with -M or -MM, suppress normal
331 preprocessed output, but still do -dM etc. as software
332 depends on this. Preprocessed output does occur if -MD, -MMD
333 or environment var dependency generation is used. */
334 cpp_opts->deps.style = (code == OPT_M ? DEPS_SYSTEM: DEPS_USER);
336 cpp_opts->inhibit_warnings = 1;
341 cpp_opts->deps.style = (code == OPT_MD ? DEPS_SYSTEM: DEPS_USER);
352 cpp_opts->deps.missing_files = true;
357 cpp_opts->deps.phony_targets = true;
363 defer_opt (code, arg);
367 flag_no_line_commands = 1;
370 case OPT_fworking_directory:
371 flag_working_directory = value;
375 defer_opt (code, arg);
381 set_Wimplicit (value);
382 warn_char_subscripts = value;
383 warn_missing_braces = value;
384 warn_parentheses = value;
385 warn_return_type = value;
386 warn_sequence_point = value; /* Was C only. */
388 if (warn_strict_aliasing == -1)
389 set_Wstrict_aliasing (value);
390 warn_address = value;
391 if (warn_strict_overflow == -1)
392 warn_strict_overflow = value;
393 warn_array_bounds = value;
394 warn_volatile_register_var = value;
396 /* Only warn about unknown pragmas that are not in system
398 warn_unknown_pragmas = value;
400 /* We save the value of warn_uninitialized, since if they put
401 -Wuninitialized on the command line, we need to generate a
402 warning about not using it without also specifying -O. */
403 if (warn_uninitialized != 1)
404 warn_uninitialized = (value ? 2 : 0);
406 if (!c_dialect_cxx ())
408 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding
409 can turn it off only if it's not explicit. */
411 warn_main = (value ? 2 : 0);
415 /* C++-specific warnings. */
416 warn_sign_compare = value;
417 warn_reorder = value;
418 warn_cxx0x_compat = value;
421 cpp_opts->warn_trigraphs = value;
422 cpp_opts->warn_comments = value;
423 cpp_opts->warn_num_sign_change = value;
426 /* DragonFly: disabled in -Wall */
427 if (warn_pointer_sign == -1)
428 warn_pointer_sign = value;
432 case OPT_Wbuiltin_macro_redefined:
433 cpp_opts->warn_builtin_macro_redefined = value;
438 cpp_opts->warn_comments = value;
441 case OPT_Wdeprecated:
442 cpp_opts->warn_deprecated = value;
445 case OPT_Wendif_labels:
446 cpp_opts->warn_endif_labels = value;
450 cpp_opts->warnings_are_errors = value;
451 global_dc->warning_as_error_requested = value;
454 case OPT_Werror_implicit_function_declaration:
455 /* For backward compatibility, this is the same as
456 -Werror=implicit-function-declaration. */
457 enable_warning_as_error ("implicit-function-declaration", value, CL_C | CL_ObjC);
465 set_Wformat (atoi (arg));
469 set_Wimplicit (value);
473 /* Silently ignore for now. */
476 case OPT_Winvalid_pch:
477 cpp_opts->warn_invalid_pch = value;
480 case OPT_Wmissing_include_dirs:
481 cpp_opts->warn_missing_include_dirs = value;
485 cpp_opts->warn_multichar = value;
488 case OPT_Wnormalized_:
489 if (!value || (arg && strcasecmp (arg, "none") == 0))
490 cpp_opts->warn_normalize = normalized_none;
491 else if (!arg || strcasecmp (arg, "nfkc") == 0)
492 cpp_opts->warn_normalize = normalized_KC;
493 else if (strcasecmp (arg, "id") == 0)
494 cpp_opts->warn_normalize = normalized_identifier_C;
495 else if (strcasecmp (arg, "nfc") == 0)
496 cpp_opts->warn_normalize = normalized_C;
498 error ("argument %qs to %<-Wnormalized%> not recognized", arg);
501 case OPT_Wreturn_type:
502 warn_return_type = value;
505 case OPT_Wstrict_null_sentinel:
506 warn_strict_null_sentinel = value;
509 case OPT_Wsystem_headers:
510 cpp_opts->warn_system_headers = value;
513 case OPT_Wtraditional:
514 cpp_opts->warn_traditional = value;
518 cpp_opts->warn_trigraphs = value;
522 cpp_opts->warn_undef = value;
525 case OPT_Wunknown_pragmas:
526 /* Set to greater than 1, so that even unknown pragmas in
527 system headers will be warned about. */
528 warn_unknown_pragmas = value * 2;
531 case OPT_Wunused_macros:
532 warn_unused_macros = value;
535 case OPT_Wvariadic_macros:
536 warn_variadic_macros = value;
539 case OPT_Wwrite_strings:
540 warn_write_strings = value;
546 warn_nonvdtor = true;
550 if (!c_dialect_cxx ())
551 set_std_c89 (false, true);
553 set_std_cxx98 (true);
560 case OPT_fcond_mismatch:
561 if (!c_dialect_cxx ())
563 flag_cond_mismatch = value;
568 case OPT_fall_virtual:
569 case OPT_falt_external_templates:
570 case OPT_fenum_int_equiv:
571 case OPT_fexternal_templates:
572 case OPT_fguiding_decls:
574 case OPT_fhuge_objects:
576 case OPT_fname_mangling_version_:
578 case OPT_fnonnull_objects:
580 case OPT_fstrict_prototype:
581 case OPT_fthis_is_variable:
582 case OPT_fvtable_thunks:
585 warning (0, "switch %qs is no longer supported", option->opt_text);
588 case OPT_faccess_control:
589 flag_access_control = value;
593 flag_no_asm = !value;
597 flag_no_builtin = !value;
604 disable_builtin_function (arg);
607 case OPT_fdirectives_only:
608 cpp_opts->directives_only = value;
611 case OPT_fdollars_in_identifiers:
612 cpp_opts->dollars_in_ident = value;
615 case OPT_ffreestanding:
617 /* Fall through.... */
620 flag_no_builtin = !value;
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;
824 case OPT_femit_struct_debug_baseonly:
825 set_struct_debug_option ("base");
828 case OPT_femit_struct_debug_reduced:
829 set_struct_debug_option ("dir:ord:sys,dir:gen:any,ind:base");
832 case OPT_femit_struct_debug_detailed_:
833 set_struct_debug_option (arg);
837 add_path (xstrdup (arg), AFTER, 0, true);
842 defer_opt (code, arg);
854 add_path (xstrdup (arg), QUOTE, 0, true);
862 add_path (xstrdup (arg), SYSTEM, 0, true);
865 case OPT_iwithprefix:
866 add_prefixed_path (arg, SYSTEM);
869 case OPT_iwithprefixbefore:
870 add_prefixed_path (arg, BRACKET);
874 cpp_set_lang (parse_in, CLK_ASM);
875 cpp_opts->dollars_in_ident = false;
894 error ("output filename specified twice");
897 /* We need to handle the -pedantic switches here, rather than in
898 c_common_post_options, so that a subsequent -Wno-endif-labels
899 is not overridden. */
900 case OPT_pedantic_errors:
901 cpp_opts->pedantic_errors = 1;
904 cpp_opts->pedantic = 1;
905 cpp_opts->warn_endif_labels = 1;
906 if (warn_pointer_sign == -1)
907 warn_pointer_sign = 1;
908 if (warn_overlength_strings == -1)
909 warn_overlength_strings = 1;
914 case OPT_print_objc_runtime_info:
915 print_struct_values = 1;
918 case OPT_print_pch_checksum:
919 c_common_print_pch_checksum (stdout);
920 exit_after_options = true;
928 case OPT_std_gnu__98:
929 if (!preprocessing_asm_p)
930 set_std_cxx98 (code == OPT_std_c__98 /* ISO */);
934 case OPT_std_gnu__0x:
935 if (!preprocessing_asm_p)
936 set_std_cxx0x (code == OPT_std_c__0x /* ISO */);
940 case OPT_std_iso9899_1990:
941 case OPT_std_iso9899_199409:
942 if (!preprocessing_asm_p)
943 set_std_c89 (code == OPT_std_iso9899_199409 /* c94 */, true /* ISO */);
947 if (!preprocessing_asm_p)
948 set_std_c89 (false /* c94 */, false /* ISO */);
953 case OPT_std_iso9899_1999:
954 case OPT_std_iso9899_199x:
955 if (!preprocessing_asm_p)
956 set_std_c99 (true /* ISO */);
961 if (!preprocessing_asm_p)
962 set_std_c99 (false /* ISO */);
966 cpp_opts->trigraphs = 1;
969 case OPT_traditional_cpp:
970 cpp_opts->traditional = 1;
978 cpp_opts->inhibit_warnings = 1;
993 /* Post-switch processing. */
995 c_common_post_options (const char **pfilename)
997 struct cpp_callbacks *cb;
999 /* Canonicalize the input and output filenames. */
1000 if (in_fnames == NULL)
1002 in_fnames = XNEWVEC (const char *, 1);
1005 else if (strcmp (in_fnames[0], "-") == 0)
1008 if (out_fname == NULL || !strcmp (out_fname, "-"))
1011 if (cpp_opts->deps.style == DEPS_NONE)
1012 check_deps_environment_vars ();
1014 handle_deferred_opts ();
1016 sanitize_cpp_opts ();
1018 register_include_chains (parse_in, sysroot, iprefix, imultilib,
1019 std_inc, std_cxx_inc && c_dialect_cxx (), verbose);
1021 #ifdef C_COMMON_OVERRIDE_OPTIONS
1022 /* Some machines may reject certain combinations of C
1023 language-specific options. */
1024 C_COMMON_OVERRIDE_OPTIONS;
1027 /* By default we use C99 inline semantics in GNU99 or C99 mode. C99
1028 inline semantics are not supported in GNU89 or C89 mode. */
1029 if (flag_gnu89_inline == -1)
1030 flag_gnu89_inline = !flag_isoc99;
1031 else if (!flag_gnu89_inline && !flag_isoc99)
1032 error ("-fno-gnu89-inline is only supported in GNU99 or C99 mode");
1034 /* Default to ObjC sjlj exception handling if NeXT runtime. */
1035 if (flag_objc_sjlj_exceptions < 0)
1036 flag_objc_sjlj_exceptions = flag_next_runtime;
1037 if (flag_objc_exceptions && !flag_objc_sjlj_exceptions)
1038 flag_exceptions = 1;
1040 /* -Wextra implies -Wtype-limits, -Wclobbered,
1041 -Wempty-body, -Wsign-compare,
1042 -Wmissing-field-initializers, -Wmissing-parameter-type
1043 -Wold-style-declaration, -Woverride-init and -Wignored-qualifiers
1044 but not if explicitly overridden. */
1045 if (warn_type_limits == -1)
1046 warn_type_limits = extra_warnings;
1047 if (warn_clobbered == -1)
1048 warn_clobbered = extra_warnings;
1049 if (warn_empty_body == -1)
1050 warn_empty_body = extra_warnings;
1051 if (warn_sign_compare == -1)
1052 warn_sign_compare = extra_warnings;
1053 if (warn_missing_field_initializers == -1)
1054 warn_missing_field_initializers = extra_warnings;
1055 if (warn_missing_parameter_type == -1)
1056 warn_missing_parameter_type = extra_warnings;
1057 if (warn_old_style_declaration == -1)
1058 warn_old_style_declaration = extra_warnings;
1059 if (warn_override_init == -1)
1060 warn_override_init = extra_warnings;
1061 if (warn_ignored_qualifiers == -1)
1062 warn_ignored_qualifiers = extra_warnings;
1064 /* -Wpointer-sign is disabled by default, but it is enabled if any
1065 of -Wall or -pedantic are given. */
1066 if (warn_pointer_sign == -1)
1067 warn_pointer_sign = 0;
1069 if (warn_strict_aliasing == -1)
1070 warn_strict_aliasing = 0;
1071 if (warn_strict_overflow == -1)
1072 warn_strict_overflow = 0;
1074 /* -Woverlength-strings is off by default, but is enabled by -pedantic.
1075 It is never enabled in C++, as the minimum limit is not normative
1076 in that standard. */
1077 if (warn_overlength_strings == -1 || c_dialect_cxx ())
1078 warn_overlength_strings = 0;
1080 /* Wmain is enabled by default in C++ but not in C. */
1081 /* Wmain is disabled by default for -ffreestanding (!flag_hosted),
1082 even if -Wall was given (warn_main will be 2 if set by -Wall, 1
1083 if set by -Wmain). */
1084 if (warn_main == -1)
1085 warn_main = (c_dialect_cxx () && flag_hosted) ? 1 : 0;
1086 else if (warn_main == 2)
1087 warn_main = flag_hosted ? 1 : 0;
1089 /* In C, -Wconversion enables -Wsign-conversion (unless disabled
1090 through -Wno-sign-conversion). While in C++,
1091 -Wsign-conversion needs to be requested explicitly. */
1092 if (warn_sign_conversion == -1)
1093 warn_sign_conversion = (c_dialect_cxx ()) ? 0 : warn_conversion;
1095 /* -Wpacked-bitfield-compat is on by default for the C languages. The
1096 warning is issued in stor-layout.c which is not part of the front-end so
1097 we need to selectively turn it on here. */
1098 if (warn_packed_bitfield_compat == -1)
1099 warn_packed_bitfield_compat = 1;
1101 /* Special format checking options don't work without -Wformat; warn if
1105 warning (OPT_Wformat_y2k,
1106 "-Wformat-y2k ignored without -Wformat");
1107 warning (OPT_Wformat_extra_args,
1108 "-Wformat-extra-args ignored without -Wformat");
1109 warning (OPT_Wformat_zero_length,
1110 "-Wformat-zero-length ignored without -Wformat");
1111 warning (OPT_Wformat_nonliteral,
1112 "-Wformat-nonliteral ignored without -Wformat");
1113 warning (OPT_Wformat_contains_nul,
1114 "-Wformat-contains-nul ignored without -Wformat");
1115 warning (OPT_Wformat_security,
1116 "-Wformat-security ignored without -Wformat");
1119 /* -Wimplicit-function-declaration is enabled by default for C99. */
1120 if (warn_implicit_function_declaration == -1)
1121 warn_implicit_function_declaration = flag_isoc99;
1123 /* If we're allowing C++0x constructs, don't warn about C++0x
1124 compatibility problems. */
1125 if (cxx_dialect == cxx0x)
1126 warn_cxx0x_compat = 0;
1128 if (flag_preprocess_only)
1130 /* Open the output now. We must do so even if flag_no_output is
1131 on, because there may be other output than from the actual
1132 preprocessing (e.g. from -dM). */
1133 if (out_fname[0] == '\0')
1134 out_stream = stdout;
1136 out_stream = fopen (out_fname, "w");
1138 if (out_stream == NULL)
1140 fatal_error ("opening output file %s: %m", out_fname);
1144 if (num_in_fnames > 1)
1145 error ("too many filenames given. Type %s --help for usage",
1148 init_pp_output (out_stream);
1154 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1155 input_location = UNKNOWN_LOCATION;
1158 cb = cpp_get_callbacks (parse_in);
1159 cb->file_change = cb_file_change;
1160 cb->dir_change = cb_dir_change;
1161 cpp_post_options (parse_in);
1163 input_location = UNKNOWN_LOCATION;
1165 /* If an error has occurred in cpplib, note it so we fail
1167 errorcount += cpp_errors (parse_in);
1169 *pfilename = this_input_filename
1170 = cpp_read_main_file (parse_in, in_fnames[0]);
1171 /* Don't do any compilation or preprocessing if there is no input file. */
1172 if (this_input_filename == NULL)
1178 if (flag_working_directory
1179 && flag_preprocess_only && !flag_no_line_commands)
1180 pp_dir_change (parse_in, get_src_pwd ());
1182 return flag_preprocess_only;
1185 /* Front end initialization common to C, ObjC and C++. */
1187 c_common_init (void)
1189 /* Set up preprocessor arithmetic. Must be done after call to
1190 c_common_nodes_and_builtins for type nodes to be good. */
1191 cpp_opts->precision = TYPE_PRECISION (intmax_type_node);
1192 cpp_opts->char_precision = TYPE_PRECISION (char_type_node);
1193 cpp_opts->int_precision = TYPE_PRECISION (integer_type_node);
1194 cpp_opts->wchar_precision = TYPE_PRECISION (wchar_type_node);
1195 cpp_opts->unsigned_wchar = TYPE_UNSIGNED (wchar_type_node);
1196 cpp_opts->bytes_big_endian = BYTES_BIG_ENDIAN;
1198 /* This can't happen until after wchar_precision and bytes_big_endian
1200 cpp_init_iconv (parse_in);
1203 c_common_print_pch_checksum (stderr);
1205 /* Has to wait until now so that cpplib has its hash table. */
1208 if (flag_preprocess_only)
1211 preprocess_file (parse_in);
1218 /* Initialize the integrated preprocessor after debug output has been
1219 initialized; loop over each input file. */
1221 c_common_parse_file (int set_yydebug)
1229 warning(0, "The C parser does not support -dy, option ignored");
1233 "The Objective-C parser does not support -dy, option ignored");
1236 warning(0, "The C++ parser does not support -dy, option ignored");
1240 "The Objective-C++ parser does not support -dy, option ignored");
1249 /* Start the main input file, if the debug writer wants it. */
1250 if (debug_hooks->start_end_main_source_file)
1251 (*debug_hooks->start_source_file) (0, this_input_filename);
1258 /* And end the main input file, if the debug writer wants it */
1259 if (debug_hooks->start_end_main_source_file)
1260 (*debug_hooks->end_source_file) (0);
1261 if (++i >= num_in_fnames)
1263 cpp_undef_all (parse_in);
1264 cpp_clear_file_cache (parse_in);
1266 = cpp_read_main_file (parse_in, in_fnames[i]);
1267 /* If an input file is missing, abandon further compilation.
1268 cpplib has issued a diagnostic. */
1269 if (!this_input_filename)
1274 /* Common finish hook for the C, ObjC and C++ front ends. */
1276 c_common_finish (void)
1278 FILE *deps_stream = NULL;
1280 if (cpp_opts->deps.style != DEPS_NONE)
1282 /* If -M or -MM was seen without -MF, default output to the
1285 deps_stream = out_stream;
1288 deps_stream = fopen (deps_file, deps_append ? "a": "w");
1290 fatal_error ("opening dependency file %s: %m", deps_file);
1294 /* For performance, avoid tearing down cpplib's internal structures
1295 with cpp_destroy (). */
1296 errorcount += cpp_finish (parse_in, deps_stream);
1298 if (deps_stream && deps_stream != out_stream
1299 && (ferror (deps_stream) || fclose (deps_stream)))
1300 fatal_error ("closing dependency file %s: %m", deps_file);
1302 if (out_stream && (ferror (out_stream) || fclose (out_stream)))
1303 fatal_error ("when writing output to %s: %m", out_fname);
1306 /* Either of two environment variables can specify output of
1307 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1308 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1309 and DEPS_TARGET is the target to mention in the deps. They also
1310 result in dependency information being appended to the output file
1311 rather than overwriting it, and like Sun's compiler
1312 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1314 check_deps_environment_vars (void)
1318 GET_ENVIRONMENT (spec, "DEPENDENCIES_OUTPUT");
1320 cpp_opts->deps.style = DEPS_USER;
1323 GET_ENVIRONMENT (spec, "SUNPRO_DEPENDENCIES");
1326 cpp_opts->deps.style = DEPS_SYSTEM;
1327 cpp_opts->deps.ignore_main_file = true;
1333 /* Find the space before the DEPS_TARGET, if there is one. */
1334 char *s = strchr (spec, ' ');
1337 /* Let the caller perform MAKE quoting. */
1338 defer_opt (OPT_MT, s + 1);
1342 /* Command line -MF overrides environment variables and default. */
1351 /* Handle deferred command line switches. */
1353 handle_deferred_opts (void)
1358 /* Avoid allocating the deps buffer if we don't need it.
1359 (This flag may be true without there having been -MT or -MQ
1360 options, but we'll still need the deps buffer.) */
1364 deps = cpp_get_deps (parse_in);
1366 for (i = 0; i < deferred_count; i++)
1368 struct deferred_opt *opt = &deferred_opts[i];
1370 if (opt->code == OPT_MT || opt->code == OPT_MQ)
1371 deps_add_target (deps, opt->arg, opt->code == OPT_MQ);
1375 /* These settings are appropriate for GCC, but not necessarily so for
1376 cpplib as a library. */
1378 sanitize_cpp_opts (void)
1380 /* If we don't know what style of dependencies to output, complain
1381 if any other dependency switches have been given. */
1382 if (deps_seen && cpp_opts->deps.style == DEPS_NONE)
1383 error ("to generate dependencies you must specify either -M or -MM");
1385 /* -dM and dependencies suppress normal output; do it here so that
1386 the last -d[MDN] switch overrides earlier ones. */
1387 if (flag_dump_macros == 'M')
1390 /* By default, -fdirectives-only implies -dD. This allows subsequent phases
1391 to perform proper macro expansion. */
1392 if (cpp_opts->directives_only && !cpp_opts->preprocessed && !flag_dump_macros)
1393 flag_dump_macros = 'D';
1395 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1396 -dM since at least glibc relies on -M -dM to work. */
1397 /* Also, flag_no_output implies flag_no_line_commands, always. */
1400 if (flag_dump_macros != 'M')
1401 flag_dump_macros = 0;
1402 flag_dump_includes = 0;
1403 flag_no_line_commands = 1;
1405 else if (cpp_opts->deps.missing_files)
1406 error ("-MG may only be used with -M or -MM");
1408 cpp_opts->unsigned_char = !flag_signed_char;
1409 cpp_opts->stdc_0_in_system_headers = STDC_0_IN_SYSTEM_HEADERS;
1411 /* We want -Wno-long-long to override -pedantic -std=non-c99
1412 and/or -Wtraditional, whatever the ordering. */
1413 cpp_opts->warn_long_long
1414 = warn_long_long && ((pedantic
1415 && (c_dialect_cxx ()
1416 ? cxx_dialect == cxx98
1418 || warn_traditional);
1420 /* Similarly with -Wno-variadic-macros. No check for c99 here, since
1421 this also turns off warnings about GCCs extension. */
1422 cpp_opts->warn_variadic_macros
1423 = warn_variadic_macros && (pedantic || warn_traditional);
1425 /* If we're generating preprocessor output, emit current directory
1426 if explicitly requested or if debugging information is enabled.
1427 ??? Maybe we should only do it for debugging formats that
1428 actually output the current directory? */
1429 if (flag_working_directory == -1)
1430 flag_working_directory = (debug_info_level != DINFO_LEVEL_NONE);
1432 if (cpp_opts->directives_only)
1434 if (warn_unused_macros)
1435 error ("-fdirectives-only is incompatible with -Wunused_macros");
1436 if (cpp_opts->traditional)
1437 error ("-fdirectives-only is incompatible with -traditional");
1441 /* Add include path with a prefix at the front of its name. */
1443 add_prefixed_path (const char *suffix, size_t chain)
1447 size_t prefix_len, suffix_len;
1449 suffix_len = strlen (suffix);
1450 prefix = iprefix ? iprefix : cpp_GCC_INCLUDE_DIR;
1451 prefix_len = iprefix ? strlen (iprefix) : cpp_GCC_INCLUDE_DIR_len;
1453 path = (char *) xmalloc (prefix_len + suffix_len + 1);
1454 memcpy (path, prefix, prefix_len);
1455 memcpy (path + prefix_len, suffix, suffix_len);
1456 path[prefix_len + suffix_len] = '\0';
1458 add_path (path, chain, 0, false);
1461 /* Handle -D, -U, -A, -imacros, and the first -include. */
1463 finish_options (void)
1465 if (!cpp_opts->preprocessed)
1469 cb_file_change (parse_in,
1470 linemap_add (line_table, LC_RENAME, 0,
1471 _("<built-in>"), 0));
1473 cpp_init_builtins (parse_in, flag_hosted);
1474 c_cpp_builtins (parse_in);
1476 /* We're about to send user input to cpplib, so make it warn for
1477 things that we previously (when we sent it internal definitions)
1478 told it to not warn.
1480 C99 permits implementation-defined characters in identifiers.
1481 The documented meaning of -std= is to turn off extensions that
1482 conflict with the specified standard, and since a strictly
1483 conforming program cannot contain a '$', we do not condition
1484 their acceptance on the -std= setting. */
1485 cpp_opts->warn_dollars = (cpp_opts->pedantic && !cpp_opts->c99);
1487 cb_file_change (parse_in,
1488 linemap_add (line_table, LC_RENAME, 0,
1489 _("<command-line>"), 0));
1491 for (i = 0; i < deferred_count; i++)
1493 struct deferred_opt *opt = &deferred_opts[i];
1495 if (opt->code == OPT_D)
1496 cpp_define (parse_in, opt->arg);
1497 else if (opt->code == OPT_U)
1498 cpp_undef (parse_in, opt->arg);
1499 else if (opt->code == OPT_A)
1501 if (opt->arg[0] == '-')
1502 cpp_unassert (parse_in, opt->arg + 1);
1504 cpp_assert (parse_in, opt->arg);
1508 /* Handle -imacros after -D and -U. */
1509 for (i = 0; i < deferred_count; i++)
1511 struct deferred_opt *opt = &deferred_opts[i];
1513 if (opt->code == OPT_imacros
1514 && cpp_push_include (parse_in, opt->arg))
1516 /* Disable push_command_line_include callback for now. */
1517 include_cursor = deferred_count + 1;
1518 cpp_scan_nooutput (parse_in);
1522 else if (cpp_opts->directives_only)
1523 cpp_init_special_builtins (parse_in);
1526 push_command_line_include ();
1529 /* Give CPP the next file given by -include, if any. */
1531 push_command_line_include (void)
1533 while (include_cursor < deferred_count)
1535 struct deferred_opt *opt = &deferred_opts[include_cursor++];
1537 if (!cpp_opts->preprocessed && opt->code == OPT_include
1538 && cpp_push_include (parse_in, opt->arg))
1542 if (include_cursor == deferred_count)
1545 /* -Wunused-macros should only warn about macros defined hereafter. */
1546 cpp_opts->warn_unused_macros = warn_unused_macros;
1547 /* Restore the line map from <command line>. */
1548 if (!cpp_opts->preprocessed)
1549 cpp_change_file (parse_in, LC_RENAME, this_input_filename);
1551 /* Set this here so the client can change the option if it wishes,
1552 and after stacking the main file so we don't trace the main file. */
1553 line_table->trace_includes = cpp_opts->print_include_names;
1557 /* File change callback. Has to handle -include files. */
1559 cb_file_change (cpp_reader * ARG_UNUSED (pfile),
1560 const struct line_map *new_map)
1562 if (flag_preprocess_only)
1563 pp_file_change (new_map);
1565 fe_file_change (new_map);
1567 if (new_map == 0 || (new_map->reason == LC_LEAVE && MAIN_FILE_P (new_map)))
1568 push_command_line_include ();
1572 cb_dir_change (cpp_reader * ARG_UNUSED (pfile), const char *dir)
1574 if (!set_src_pwd (dir))
1575 warning (0, "too late for # directive to set debug directory");
1578 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1579 extensions if ISO). There is no concept of gnu94. */
1581 set_std_c89 (int c94, int iso)
1583 cpp_set_lang (parse_in, c94 ? CLK_STDC94: iso ? CLK_STDC89: CLK_GNUC89);
1586 flag_no_gnu_keywords = iso;
1587 flag_no_nonansi_builtin = iso;
1592 /* Set the C 99 standard (without GNU extensions if ISO). */
1594 set_std_c99 (int iso)
1596 cpp_set_lang (parse_in, iso ? CLK_STDC99: CLK_GNUC99);
1598 flag_no_nonansi_builtin = iso;
1604 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1606 set_std_cxx98 (int iso)
1608 cpp_set_lang (parse_in, iso ? CLK_CXX98: CLK_GNUCXX);
1609 flag_no_gnu_keywords = iso;
1610 flag_no_nonansi_builtin = iso;
1612 cxx_dialect = cxx98;
1615 /* Set the C++ 0x working draft "standard" (without GNU extensions if ISO). */
1617 set_std_cxx0x (int iso)
1619 cpp_set_lang (parse_in, iso ? CLK_CXX0X: CLK_GNUCXX0X);
1620 flag_no_gnu_keywords = iso;
1621 flag_no_nonansi_builtin = iso;
1623 cxx_dialect = cxx0x;
1626 /* Handle setting implicit to ON. */
1628 set_Wimplicit (int on)
1631 warn_implicit_int = on;
1632 warn_implicit_function_declaration = on;
1635 /* Args to -d specify what to dump. Silently ignore
1636 unrecognized options; they may be aimed at toplev.c. */
1638 handle_OPT_d (const char *arg)
1642 while ((c = *arg++) != '\0')
1645 case 'M': /* Dump macros only. */
1646 case 'N': /* Dump names. */
1647 case 'D': /* Dump definitions. */
1648 case 'U': /* Dump used macros. */
1649 flag_dump_macros = c;
1653 flag_dump_includes = 1;