1 /* C/ObjC/C++ command line option handling.
2 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007
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"
36 #include "c-incpath.h"
37 #include "debug.h" /* For debug_hooks. */
43 #ifndef DOLLARS_IN_IDENTIFIERS
44 # define DOLLARS_IN_IDENTIFIERS true
47 #ifndef TARGET_SYSTEM_ROOT
48 # define TARGET_SYSTEM_ROOT NULL
52 #define TARGET_OPTF(ARG)
56 static cpp_options *cpp_opts;
59 static const char *this_input_filename;
61 /* Filename and stream for preprocessed output. */
62 static const char *out_fname;
63 static FILE *out_stream;
65 /* Append dependencies to deps_file. */
66 static bool deps_append;
68 /* If dependency switches (-MF etc.) have been given. */
69 static bool deps_seen;
74 /* If -lang-fortran seen. */
75 bool lang_fortran = false;
77 /* Dependency output file. */
78 static const char *deps_file;
80 /* The prefix given by -iprefix, if any. */
81 static const char *iprefix;
83 /* The multilib directory given by -imultilib, if any. */
84 static const char *imultilib;
86 /* The system root, if any. Overridden by -isysroot. */
87 static const char *sysroot = TARGET_SYSTEM_ROOT;
89 /* Zero disables all standard directories for headers. */
90 static bool std_inc = true;
92 /* Zero disables the C++-specific standard directories for headers. */
93 static bool std_cxx_inc = true;
95 /* If the quote chain has been split by -I-. */
96 static bool quote_chain_split;
98 /* If -Wunused-macros. */
99 static bool warn_unused_macros;
101 /* If -Wvariadic-macros. */
102 static bool warn_variadic_macros = true;
104 /* Number of deferred options. */
105 static size_t deferred_count;
107 /* Number of deferred options scanned for -include. */
108 static size_t include_cursor;
110 static void set_Wimplicit (int);
111 static void handle_OPT_d (const char *);
112 static void set_std_cxx98 (int);
113 static void set_std_cxx0x (int);
114 static void set_std_c89 (int, int);
115 static void set_std_c99 (int);
116 static void check_deps_environment_vars (void);
117 static void handle_deferred_opts (void);
118 static void sanitize_cpp_opts (void);
119 static void add_prefixed_path (const char *, size_t);
120 static void push_command_line_include (void);
121 static void cb_file_change (cpp_reader *, const struct line_map *);
122 static void cb_dir_change (cpp_reader *, const char *);
123 static void finish_options (void);
125 #ifndef STDC_0_IN_SYSTEM_HEADERS
126 #define STDC_0_IN_SYSTEM_HEADERS 0
129 /* Holds switches parsed by c_common_handle_option (), but whose
130 handling is deferred to c_common_post_options (). */
131 static void defer_opt (enum opt_code, const char *);
132 static struct deferred_opt
138 /* Complain that switch CODE expects an argument but none was
139 provided. OPT was the command-line option. Return FALSE to get
140 the default message in opts.c, TRUE if we provide a specialized
143 c_common_missing_argument (const char *opt, size_t code)
148 /* Pick up the default message. */
151 case OPT_fconstant_string_class_:
152 error ("no class name specified with %qs", opt);
156 error ("assertion missing after %qs", opt);
161 error ("macro name missing after %qs", opt);
170 error ("missing path after %qs", opt);
179 error ("missing filename after %qs", opt);
184 error ("missing makefile target after %qs", opt);
191 /* Defer option CODE with argument ARG. */
193 defer_opt (enum opt_code code, const char *arg)
195 deferred_opts[deferred_count].code = code;
196 deferred_opts[deferred_count].arg = arg;
200 /* Common initialization before parsing options. */
202 c_common_init_options (unsigned int argc, const char **argv)
204 static const unsigned int lang_flags[] = {CL_C, CL_ObjC, CL_CXX, CL_ObjCXX};
205 unsigned int i, result;
207 /* This is conditionalized only because that is the way the front
208 ends used to do it. Maybe this should be unconditional? */
209 if (c_dialect_cxx ())
211 /* By default wrap lines at 80 characters. Is getenv
212 ("COLUMNS") preferable? */
213 diagnostic_line_cutoff (global_dc) = 80;
214 /* By default, emit location information once for every
215 diagnostic message. */
216 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
219 parse_in = cpp_create_reader (c_dialect_cxx () ? CLK_GNUCXX: CLK_GNUC89,
220 ident_hash, &line_table);
222 cpp_opts = cpp_get_options (parse_in);
223 cpp_opts->dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
224 cpp_opts->objc = c_dialect_objc ();
226 /* Reset to avoid warnings on internal definitions. We set it just
227 before passing on command-line options to cpplib. */
228 cpp_opts->warn_dollars = 0;
230 flag_exceptions = c_dialect_cxx ();
231 warn_pointer_arith = c_dialect_cxx ();
232 warn_write_strings = c_dialect_cxx();
234 /* By default, C99-like requirements for complex multiply and divide. */
235 flag_complex_method = 2;
237 deferred_opts = XNEWVEC (struct deferred_opt, argc);
239 result = lang_flags[c_language];
241 if (c_language == clk_c)
243 /* If preprocessing assembly language, accept any of the C-family
244 front end options since the driver may pass them through. */
245 for (i = 1; i < argc; i++)
246 if (! strcmp (argv[i], "-lang-asm"))
248 result |= CL_C | CL_ObjC | CL_CXX | CL_ObjCXX;
253 for (i = 1; i < argc; i++)
254 if (! strcmp (argv[i], "-lang-fortran"))
256 result |= CL_Fortran;
265 /* Handle switch SCODE with argument ARG. VALUE is true, unless no-
266 form of an -f or -W option was given. Returns 0 if the switch was
267 invalid, a negative number to prevent language-independent
268 processing in toplev.c (a hack necessary for the short-term). */
270 c_common_handle_option (size_t scode, const char *arg, int value)
272 const struct cl_option *option = &cl_options[scode];
273 enum opt_code code = (enum opt_code) scode;
276 /* Prevent resetting the language standard to a C dialect when the driver
277 has already determined that we're looking at assembler input. */
278 bool preprocessing_asm_p = (cpp_get_options (parse_in)->lang == CLK_ASM);
283 if (cl_options[code].flags & (CL_C | CL_CXX | CL_ObjC | CL_ObjCXX))
285 if ((option->flags & CL_TARGET)
286 && ! targetcm.handle_c_option (scode, arg, value))
291 if (lang_fortran && (cl_options[code].flags & (CL_Fortran)))
297 case OPT__output_pch_:
302 defer_opt (code, arg);
306 cpp_opts->discard_comments = 0;
310 cpp_opts->discard_comments = 0;
311 cpp_opts->discard_comments_in_macro_exp = 0;
315 defer_opt (code, arg);
319 flag_preprocess_only = 1;
323 cpp_opts->print_include_names = 1;
327 TARGET_OPTF (xstrdup (arg));
331 if (strcmp (arg, "-"))
332 add_path (xstrdup (arg), BRACKET, 0, true);
335 if (quote_chain_split)
336 error ("-I- specified twice");
337 quote_chain_split = true;
338 split_quote_chain ();
339 inform ("obsolete option -I- used, please use -iquote instead");
345 /* When doing dependencies with -M or -MM, suppress normal
346 preprocessed output, but still do -dM etc. as software
347 depends on this. Preprocessed output does occur if -MD, -MMD
348 or environment var dependency generation is used. */
349 cpp_opts->deps.style = (code == OPT_M ? DEPS_SYSTEM: DEPS_USER);
351 cpp_opts->inhibit_warnings = 1;
356 cpp_opts->deps.style = (code == OPT_MD ? DEPS_SYSTEM: DEPS_USER);
367 cpp_opts->deps.missing_files = true;
372 cpp_opts->deps.phony_targets = true;
378 defer_opt (code, arg);
382 flag_no_line_commands = 1;
385 case OPT_fworking_directory:
386 flag_working_directory = value;
390 defer_opt (code, arg);
396 set_Wimplicit (value);
397 warn_char_subscripts = value;
398 warn_missing_braces = value;
399 warn_parentheses = value;
400 warn_return_type = value;
401 warn_sequence_point = value; /* Was C only. */
402 if (c_dialect_cxx ())
403 warn_sign_compare = value;
405 set_Wstrict_aliasing (value);
406 warn_address = value;
407 warn_strict_overflow = value;
408 warn_array_bounds = value;
410 /* Only warn about unknown pragmas that are not in system
412 warn_unknown_pragmas = value;
414 /* We save the value of warn_uninitialized, since if they put
415 -Wuninitialized on the command line, we need to generate a
416 warning about not using it without also specifying -O. */
417 if (warn_uninitialized != 1)
418 warn_uninitialized = (value ? 2 : 0);
420 if (!c_dialect_cxx ())
421 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding
422 can turn it off only if it's not explicit. */
423 warn_main = value * 2;
426 /* C++-specific warnings. */
427 warn_reorder = value;
428 warn_nontemplate_friend = value;
429 warn_cxx0x_compat = value;
431 warn_write_strings = true;
434 cpp_opts->warn_trigraphs = value;
435 cpp_opts->warn_comments = value;
436 cpp_opts->warn_num_sign_change = value;
437 cpp_opts->warn_multichar = value; /* Was C++ only. */
439 if (warn_pointer_sign == -1)
440 warn_pointer_sign = 1;
445 cpp_opts->warn_comments = value;
448 case OPT_Wdeprecated:
449 cpp_opts->warn_deprecated = value;
452 case OPT_Wendif_labels:
453 cpp_opts->warn_endif_labels = value;
457 cpp_opts->warnings_are_errors = value;
458 global_dc->warning_as_error_requested = value;
461 case OPT_Werror_implicit_function_declaration:
462 /* For backward compatibility, this is the same as
463 -Werror=implicit-function-declaration. */
464 enable_warning_as_error ("implicit-function-declaration", value, CL_C | CL_ObjC);
472 set_Wformat (atoi (arg));
476 set_Wimplicit (value);
480 /* Silently ignore for now. */
483 case OPT_Winvalid_pch:
484 cpp_opts->warn_invalid_pch = value;
494 case OPT_Wmissing_include_dirs:
495 cpp_opts->warn_missing_include_dirs = value;
499 cpp_opts->warn_multichar = value;
502 case OPT_Wnormalized_:
503 if (!value || (arg && strcasecmp (arg, "none") == 0))
504 cpp_opts->warn_normalize = normalized_none;
505 else if (!arg || strcasecmp (arg, "nfkc") == 0)
506 cpp_opts->warn_normalize = normalized_KC;
507 else if (strcasecmp (arg, "id") == 0)
508 cpp_opts->warn_normalize = normalized_identifier_C;
509 else if (strcasecmp (arg, "nfc") == 0)
510 cpp_opts->warn_normalize = normalized_C;
512 error ("argument %qs to %<-Wnormalized%> not recognized", arg);
515 case OPT_Wreturn_type:
516 warn_return_type = value;
519 case OPT_Wstrict_null_sentinel:
520 warn_strict_null_sentinel = value;
523 case OPT_Wsystem_headers:
524 cpp_opts->warn_system_headers = value;
527 case OPT_Wtraditional:
528 cpp_opts->warn_traditional = value;
532 cpp_opts->warn_trigraphs = value;
536 cpp_opts->warn_undef = value;
539 case OPT_Wunknown_pragmas:
540 /* Set to greater than 1, so that even unknown pragmas in
541 system headers will be warned about. */
542 warn_unknown_pragmas = value * 2;
545 case OPT_Wunused_macros:
546 warn_unused_macros = value;
549 case OPT_Wvariadic_macros:
550 warn_variadic_macros = value;
553 case OPT_Wwrite_strings:
554 warn_write_strings = value;
560 warn_nonvdtor = true;
564 if (!c_dialect_cxx ())
565 set_std_c89 (false, true);
567 set_std_cxx98 (true);
574 case OPT_fcond_mismatch:
575 if (!c_dialect_cxx ())
577 flag_cond_mismatch = value;
582 case OPT_fall_virtual:
583 case OPT_falt_external_templates:
584 case OPT_fenum_int_equiv:
585 case OPT_fexternal_templates:
586 case OPT_fguiding_decls:
588 case OPT_fhuge_objects:
590 case OPT_fname_mangling_version_:
592 case OPT_fnonnull_objects:
594 case OPT_fstrict_prototype:
595 case OPT_fthis_is_variable:
596 case OPT_fvtable_thunks:
599 warning (0, "switch %qs is no longer supported", option->opt_text);
602 case OPT_faccess_control:
603 flag_access_control = value;
607 flag_no_asm = !value;
611 flag_no_builtin = !value;
618 disable_builtin_function (arg);
621 case OPT_fdirectives_only:
622 cpp_opts->directives_only = 1;
625 case OPT_fdollars_in_identifiers:
626 cpp_opts->dollars_in_ident = value;
629 case OPT_ffreestanding:
631 /* Fall through.... */
634 flag_no_builtin = !value;
635 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
636 if (!value && warn_main == 2)
640 case OPT_fshort_double:
641 flag_short_double = value;
644 case OPT_fshort_enums:
645 flag_short_enums = value;
648 case OPT_fshort_wchar:
649 flag_short_wchar = value;
652 case OPT_fsigned_bitfields:
653 flag_signed_bitfields = value;
656 case OPT_fsigned_char:
657 flag_signed_char = value;
660 case OPT_funsigned_bitfields:
661 flag_signed_bitfields = !value;
664 case OPT_funsigned_char:
665 flag_signed_char = !value;
669 flag_check_new = value;
672 case OPT_fconserve_space:
673 flag_conserve_space = value;
676 case OPT_fconstant_string_class_:
677 constant_string_class_name = arg;
680 case OPT_fdefault_inline:
681 flag_default_inline = value;
684 case OPT_felide_constructors:
685 flag_elide_constructors = value;
688 case OPT_fenforce_eh_specs:
689 flag_enforce_eh_specs = value;
692 case OPT_fextended_identifiers:
693 cpp_opts->extended_identifiers = value;
697 flag_new_for_scope = value;
700 case OPT_fgnu_keywords:
701 flag_no_gnu_keywords = !value;
704 case OPT_fgnu_runtime:
705 flag_next_runtime = !value;
708 case OPT_fhandle_exceptions:
709 warning (0, "-fhandle-exceptions has been renamed -fexceptions (and is now on by default)");
710 flag_exceptions = value;
713 case OPT_fimplement_inlines:
714 flag_implement_inlines = value;
717 case OPT_fimplicit_inline_templates:
718 flag_implicit_inline_templates = value;
721 case OPT_fimplicit_templates:
722 flag_implicit_templates = value;
725 case OPT_flax_vector_conversions:
726 flag_lax_vector_conversions = value;
729 case OPT_fms_extensions:
730 flag_ms_extensions = value;
733 case OPT_fnext_runtime:
734 flag_next_runtime = value;
737 case OPT_fnil_receivers:
738 flag_nil_receivers = value;
741 case OPT_fnonansi_builtins:
742 flag_no_nonansi_builtin = !value;
745 case OPT_foperator_names:
746 cpp_opts->operator_names = value;
749 case OPT_foptional_diags:
750 flag_optional_diags = value;
754 cpp_opts->restore_pch_deps = value;
757 case OPT_fpch_preprocess:
758 flag_pch_preprocess = value;
761 case OPT_fpermissive:
762 flag_permissive = value;
765 case OPT_fpreprocessed:
766 cpp_opts->preprocessed = value;
769 case OPT_freplace_objc_classes:
770 flag_replace_objc_classes = value;
774 flag_use_repository = value;
776 flag_implicit_templates = 0;
783 case OPT_fshow_column:
784 cpp_opts->show_column = value;
788 flag_detailed_statistics = value;
792 /* It is documented that we silently ignore silly values. */
793 if (value >= 1 && value <= 100)
794 cpp_opts->tabstop = value;
797 case OPT_fexec_charset_:
798 cpp_opts->narrow_charset = arg;
801 case OPT_fwide_exec_charset_:
802 cpp_opts->wide_charset = arg;
805 case OPT_finput_charset_:
806 cpp_opts->input_charset = arg;
809 case OPT_ftemplate_depth_:
810 max_tinst_depth = value;
813 case OPT_fuse_cxa_atexit:
814 flag_use_cxa_atexit = value;
817 case OPT_fuse_cxa_get_exception_ptr:
818 flag_use_cxa_get_exception_ptr = value;
821 case OPT_fvisibility_inlines_hidden:
822 visibility_options.inlines_hidden = value;
829 case OPT_fthreadsafe_statics:
830 flag_threadsafe_statics = value;
834 flag_zero_link = value;
838 flag_gen_declaration = 1;
841 case OPT_femit_struct_debug_baseonly:
842 set_struct_debug_option ("base");
845 case OPT_femit_struct_debug_reduced:
846 set_struct_debug_option ("dir:ord:sys,dir:gen:any,ind:base");
849 case OPT_femit_struct_debug_detailed_:
850 set_struct_debug_option (arg);
854 add_path (xstrdup (arg), AFTER, 0, true);
859 defer_opt (code, arg);
871 add_path (xstrdup (arg), QUOTE, 0, true);
879 add_path (xstrdup (arg), SYSTEM, 0, true);
882 case OPT_iwithprefix:
883 add_prefixed_path (arg, SYSTEM);
886 case OPT_iwithprefixbefore:
887 add_prefixed_path (arg, BRACKET);
891 cpp_set_lang (parse_in, CLK_ASM);
892 cpp_opts->dollars_in_ident = false;
895 case OPT_lang_fortran:
915 error ("output filename specified twice");
918 /* We need to handle the -pedantic switches here, rather than in
919 c_common_post_options, so that a subsequent -Wno-endif-labels
920 is not overridden. */
921 case OPT_pedantic_errors:
922 cpp_opts->pedantic_errors = 1;
925 cpp_opts->pedantic = 1;
926 cpp_opts->warn_endif_labels = 1;
927 if (warn_pointer_sign == -1)
928 warn_pointer_sign = 1;
929 if (warn_overlength_strings == -1)
930 warn_overlength_strings = 1;
933 case OPT_print_objc_runtime_info:
934 print_struct_values = 1;
937 case OPT_print_pch_checksum:
938 c_common_print_pch_checksum (stdout);
939 exit_after_options = true;
947 case OPT_std_gnu__98:
948 if (!preprocessing_asm_p)
949 set_std_cxx98 (code == OPT_std_c__98 /* ISO */);
953 case OPT_std_gnu__0x:
954 if (!preprocessing_asm_p)
955 set_std_cxx0x (code == OPT_std_c__0x /* ISO */);
959 case OPT_std_iso9899_1990:
960 case OPT_std_iso9899_199409:
961 if (!preprocessing_asm_p)
962 set_std_c89 (code == OPT_std_iso9899_199409 /* c94 */, true /* ISO */);
966 if (!preprocessing_asm_p)
967 set_std_c89 (false /* c94 */, false /* ISO */);
972 case OPT_std_iso9899_1999:
973 case OPT_std_iso9899_199x:
974 if (!preprocessing_asm_p)
975 set_std_c99 (true /* ISO */);
980 if (!preprocessing_asm_p)
981 set_std_c99 (false /* ISO */);
985 cpp_opts->trigraphs = 1;
988 case OPT_traditional_cpp:
989 cpp_opts->traditional = 1;
997 cpp_opts->inhibit_warnings = 1;
1008 /* Post-switch processing. */
1010 c_common_post_options (const char **pfilename)
1012 struct cpp_callbacks *cb;
1014 /* Canonicalize the input and output filenames. */
1015 if (in_fnames == NULL)
1017 in_fnames = XNEWVEC (const char *, 1);
1020 else if (strcmp (in_fnames[0], "-") == 0)
1023 if (out_fname == NULL || !strcmp (out_fname, "-"))
1026 if (cpp_opts->deps.style == DEPS_NONE)
1027 check_deps_environment_vars ();
1029 handle_deferred_opts ();
1031 sanitize_cpp_opts ();
1033 register_include_chains (parse_in, sysroot, iprefix, imultilib,
1034 std_inc, std_cxx_inc && c_dialect_cxx (), verbose);
1036 #ifdef C_COMMON_OVERRIDE_OPTIONS
1037 /* Some machines may reject certain combinations of C
1038 language-specific options. */
1039 C_COMMON_OVERRIDE_OPTIONS;
1042 flag_inline_trees = 1;
1044 /* Use tree inlining. */
1045 if (!flag_no_inline)
1047 if (flag_inline_functions)
1048 flag_inline_trees = 2;
1050 /* By default we use C99 inline semantics in GNU99 or C99 mode. C99
1051 inline semantics are not supported in GNU89 or C89 mode. */
1052 if (flag_gnu89_inline == -1)
1053 flag_gnu89_inline = !flag_isoc99;
1054 else if (!flag_gnu89_inline && !flag_isoc99)
1055 error ("-fno-gnu89-inline is only supported in GNU99 or C99 mode");
1057 /* If we are given more than one input file, we must use
1058 unit-at-a-time mode. */
1059 if (num_in_fnames > 1)
1060 flag_unit_at_a_time = 1;
1062 /* Default to ObjC sjlj exception handling if NeXT runtime. */
1063 if (flag_objc_sjlj_exceptions < 0)
1064 flag_objc_sjlj_exceptions = flag_next_runtime;
1065 if (flag_objc_exceptions && !flag_objc_sjlj_exceptions)
1066 flag_exceptions = 1;
1068 /* -Wextra implies -Wtype-limits, -Wclobbered,
1069 -Wempty-body, -Wsign-compare,
1070 -Wmissing-field-initializers, -Wmissing-parameter-type
1071 -Wold-style-declaration, and -Woverride-init,
1072 but not if explicitly overridden. */
1073 if (warn_type_limits == -1)
1074 warn_type_limits = extra_warnings;
1075 if (warn_clobbered == -1)
1076 warn_clobbered = extra_warnings;
1077 if (warn_empty_body == -1)
1078 warn_empty_body = extra_warnings;
1079 if (warn_sign_compare == -1)
1080 warn_sign_compare = extra_warnings;
1081 if (warn_missing_field_initializers == -1)
1082 warn_missing_field_initializers = extra_warnings;
1083 if (warn_missing_parameter_type == -1)
1084 warn_missing_parameter_type = extra_warnings;
1085 if (warn_old_style_declaration == -1)
1086 warn_old_style_declaration = extra_warnings;
1087 if (warn_override_init == -1)
1088 warn_override_init = extra_warnings;
1090 /* -Wpointer_sign is disabled by default, but it is enabled if any
1091 of -Wall or -pedantic are given. */
1092 if (warn_pointer_sign == -1)
1093 warn_pointer_sign = 0;
1095 /* -Woverlength-strings is off by default, but is enabled by -pedantic.
1096 It is never enabled in C++, as the minimum limit is not normative
1097 in that standard. */
1098 if (warn_overlength_strings == -1 || c_dialect_cxx ())
1099 warn_overlength_strings = 0;
1101 /* Adjust various flags for C++ based on command-line settings. */
1102 if (c_dialect_cxx ())
1104 if (!flag_permissive)
1106 flag_pedantic_errors = 1;
1107 cpp_opts->pedantic_errors = 1;
1109 if (!flag_no_inline)
1111 flag_inline_trees = 1;
1114 if (flag_inline_functions)
1115 flag_inline_trees = 2;
1118 /* In C, -Wconversion enables -Wsign-conversion (unless disabled
1119 through -Wno-sign-conversion). While in C++,
1120 -Wsign-conversion needs to be requested explicitly. */
1121 if (warn_sign_conversion == -1)
1122 warn_sign_conversion = (c_dialect_cxx ()) ? 0 : warn_conversion;
1125 /* Special format checking options don't work without -Wformat; warn if
1129 warning (OPT_Wformat_y2k,
1130 "-Wformat-y2k ignored without -Wformat");
1131 warning (OPT_Wformat_extra_args,
1132 "-Wformat-extra-args ignored without -Wformat");
1133 warning (OPT_Wformat_zero_length,
1134 "-Wformat-zero-length ignored without -Wformat");
1135 warning (OPT_Wformat_nonliteral,
1136 "-Wformat-nonliteral ignored without -Wformat");
1137 warning (OPT_Wformat_contains_nul,
1138 "-Wformat-contains-nul ignored without -Wformat");
1139 warning (OPT_Wformat_security,
1140 "-Wformat-security ignored without -Wformat");
1143 /* -Wimplicit-function-declaration is enabled by default for C99. */
1144 if (warn_implicit_function_declaration == -1)
1145 warn_implicit_function_declaration = flag_isoc99;
1147 /* If we're allowing C++0x constructs, don't warn about C++0x
1148 compatibility problems. */
1149 if (cxx_dialect == cxx0x)
1150 warn_cxx0x_compat = 0;
1152 if (flag_preprocess_only)
1154 /* Open the output now. We must do so even if flag_no_output is
1155 on, because there may be other output than from the actual
1156 preprocessing (e.g. from -dM). */
1157 if (out_fname[0] == '\0')
1158 out_stream = stdout;
1160 out_stream = fopen (out_fname, "w");
1162 if (out_stream == NULL)
1164 fatal_error ("opening output file %s: %m", out_fname);
1168 if (num_in_fnames > 1)
1169 error ("too many filenames given. Type %s --help for usage",
1172 init_pp_output (out_stream);
1178 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1179 input_location = UNKNOWN_LOCATION;
1182 cb = cpp_get_callbacks (parse_in);
1183 cb->file_change = cb_file_change;
1184 cb->dir_change = cb_dir_change;
1185 cpp_post_options (parse_in);
1187 input_location = UNKNOWN_LOCATION;
1189 /* If an error has occurred in cpplib, note it so we fail
1191 errorcount += cpp_errors (parse_in);
1193 *pfilename = this_input_filename
1194 = cpp_read_main_file (parse_in, in_fnames[0]);
1195 /* Don't do any compilation or preprocessing if there is no input file. */
1196 if (this_input_filename == NULL)
1202 if (flag_working_directory
1203 && flag_preprocess_only && !flag_no_line_commands)
1204 pp_dir_change (parse_in, get_src_pwd ());
1206 return flag_preprocess_only;
1209 /* Front end initialization common to C, ObjC and C++. */
1211 c_common_init (void)
1213 /* Set up preprocessor arithmetic. Must be done after call to
1214 c_common_nodes_and_builtins for type nodes to be good. */
1215 cpp_opts->precision = TYPE_PRECISION (intmax_type_node);
1216 cpp_opts->char_precision = TYPE_PRECISION (char_type_node);
1217 cpp_opts->int_precision = TYPE_PRECISION (integer_type_node);
1218 cpp_opts->wchar_precision = TYPE_PRECISION (wchar_type_node);
1219 cpp_opts->unsigned_wchar = TYPE_UNSIGNED (wchar_type_node);
1220 cpp_opts->bytes_big_endian = BYTES_BIG_ENDIAN;
1222 /* This can't happen until after wchar_precision and bytes_big_endian
1224 cpp_init_iconv (parse_in);
1227 c_common_print_pch_checksum (stderr);
1229 if (flag_preprocess_only)
1232 preprocess_file (parse_in);
1236 /* Has to wait until now so that cpplib has its hash table. */
1242 /* Initialize the integrated preprocessor after debug output has been
1243 initialized; loop over each input file. */
1245 c_common_parse_file (int set_yydebug)
1253 warning(0, "The C parser does not support -dy, option ignored");
1257 "The Objective-C parser does not support -dy, option ignored");
1260 warning(0, "The C++ parser does not support -dy, option ignored");
1264 "The Objective-C++ parser does not support -dy, option ignored");
1273 /* Start the main input file, if the debug writer wants it. */
1274 if (debug_hooks->start_end_main_source_file)
1275 (*debug_hooks->start_source_file) (0, this_input_filename);
1282 /* And end the main input file, if the debug writer wants it */
1283 if (debug_hooks->start_end_main_source_file)
1284 (*debug_hooks->end_source_file) (0);
1285 if (++i >= num_in_fnames)
1287 cpp_undef_all (parse_in);
1289 = cpp_read_main_file (parse_in, in_fnames[i]);
1290 /* If an input file is missing, abandon further compilation.
1291 cpplib has issued a diagnostic. */
1292 if (!this_input_filename)
1297 /* Common finish hook for the C, ObjC and C++ front ends. */
1299 c_common_finish (void)
1301 FILE *deps_stream = NULL;
1303 if (cpp_opts->deps.style != DEPS_NONE)
1305 /* If -M or -MM was seen without -MF, default output to the
1308 deps_stream = out_stream;
1311 deps_stream = fopen (deps_file, deps_append ? "a": "w");
1313 fatal_error ("opening dependency file %s: %m", deps_file);
1317 /* For performance, avoid tearing down cpplib's internal structures
1318 with cpp_destroy (). */
1319 errorcount += cpp_finish (parse_in, deps_stream);
1321 if (deps_stream && deps_stream != out_stream
1322 && (ferror (deps_stream) || fclose (deps_stream)))
1323 fatal_error ("closing dependency file %s: %m", deps_file);
1325 if (out_stream && (ferror (out_stream) || fclose (out_stream)))
1326 fatal_error ("when writing output to %s: %m", out_fname);
1329 /* Either of two environment variables can specify output of
1330 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1331 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1332 and DEPS_TARGET is the target to mention in the deps. They also
1333 result in dependency information being appended to the output file
1334 rather than overwriting it, and like Sun's compiler
1335 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1337 check_deps_environment_vars (void)
1341 GET_ENVIRONMENT (spec, "DEPENDENCIES_OUTPUT");
1343 cpp_opts->deps.style = DEPS_USER;
1346 GET_ENVIRONMENT (spec, "SUNPRO_DEPENDENCIES");
1349 cpp_opts->deps.style = DEPS_SYSTEM;
1350 cpp_opts->deps.ignore_main_file = true;
1356 /* Find the space before the DEPS_TARGET, if there is one. */
1357 char *s = strchr (spec, ' ');
1360 /* Let the caller perform MAKE quoting. */
1361 defer_opt (OPT_MT, s + 1);
1365 /* Command line -MF overrides environment variables and default. */
1374 /* Handle deferred command line switches. */
1376 handle_deferred_opts (void)
1381 /* Avoid allocating the deps buffer if we don't need it.
1382 (This flag may be true without there having been -MT or -MQ
1383 options, but we'll still need the deps buffer.) */
1387 deps = cpp_get_deps (parse_in);
1389 for (i = 0; i < deferred_count; i++)
1391 struct deferred_opt *opt = &deferred_opts[i];
1393 if (opt->code == OPT_MT || opt->code == OPT_MQ)
1394 deps_add_target (deps, opt->arg, opt->code == OPT_MQ);
1398 /* These settings are appropriate for GCC, but not necessarily so for
1399 cpplib as a library. */
1401 sanitize_cpp_opts (void)
1403 /* If we don't know what style of dependencies to output, complain
1404 if any other dependency switches have been given. */
1405 if (deps_seen && cpp_opts->deps.style == DEPS_NONE)
1406 error ("to generate dependencies you must specify either -M or -MM");
1408 /* -dM and dependencies suppress normal output; do it here so that
1409 the last -d[MDN] switch overrides earlier ones. */
1410 if (flag_dump_macros == 'M')
1413 /* By default, -fdirectives-only implies -dD. This allows subsequent phases
1414 to perform proper macro expansion. */
1415 if (cpp_opts->directives_only && !cpp_opts->preprocessed && !flag_dump_macros)
1416 flag_dump_macros = 'D';
1418 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1419 -dM since at least glibc relies on -M -dM to work. */
1420 /* Also, flag_no_output implies flag_no_line_commands, always. */
1423 if (flag_dump_macros != 'M')
1424 flag_dump_macros = 0;
1425 flag_dump_includes = 0;
1426 flag_no_line_commands = 1;
1429 cpp_opts->unsigned_char = !flag_signed_char;
1430 cpp_opts->stdc_0_in_system_headers = STDC_0_IN_SYSTEM_HEADERS;
1432 /* We want -Wno-long-long to override -pedantic -std=non-c99
1433 and/or -Wtraditional, whatever the ordering. */
1434 cpp_opts->warn_long_long
1435 = warn_long_long && ((!flag_isoc99 && pedantic) || warn_traditional);
1437 /* Similarly with -Wno-variadic-macros. No check for c99 here, since
1438 this also turns off warnings about GCCs extension. */
1439 cpp_opts->warn_variadic_macros
1440 = warn_variadic_macros && (pedantic || warn_traditional);
1442 /* If we're generating preprocessor output, emit current directory
1443 if explicitly requested or if debugging information is enabled.
1444 ??? Maybe we should only do it for debugging formats that
1445 actually output the current directory? */
1446 if (flag_working_directory == -1)
1447 flag_working_directory = (debug_info_level != DINFO_LEVEL_NONE);
1449 if (cpp_opts->directives_only)
1451 if (warn_unused_macros)
1452 error ("-fdirectives-only is incompatible with -Wunused_macros");
1453 if (cpp_opts->traditional)
1454 error ("-fdirectives-only is incompatible with -traditional");
1458 /* Add include path with a prefix at the front of its name. */
1460 add_prefixed_path (const char *suffix, size_t chain)
1464 size_t prefix_len, suffix_len;
1466 suffix_len = strlen (suffix);
1467 prefix = iprefix ? iprefix : cpp_GCC_INCLUDE_DIR;
1468 prefix_len = iprefix ? strlen (iprefix) : cpp_GCC_INCLUDE_DIR_len;
1470 path = (char *) xmalloc (prefix_len + suffix_len + 1);
1471 memcpy (path, prefix, prefix_len);
1472 memcpy (path + prefix_len, suffix, suffix_len);
1473 path[prefix_len + suffix_len] = '\0';
1475 add_path (path, chain, 0, false);
1478 /* Handle -D, -U, -A, -imacros, and the first -include. */
1480 finish_options (void)
1482 if (!cpp_opts->preprocessed)
1486 cb_file_change (parse_in,
1487 linemap_add (&line_table, LC_RENAME, 0,
1488 _("<built-in>"), 0));
1490 cpp_init_builtins (parse_in, flag_hosted);
1491 c_cpp_builtins (parse_in);
1493 /* We're about to send user input to cpplib, so make it warn for
1494 things that we previously (when we sent it internal definitions)
1495 told it to not warn.
1497 C99 permits implementation-defined characters in identifiers.
1498 The documented meaning of -std= is to turn off extensions that
1499 conflict with the specified standard, and since a strictly
1500 conforming program cannot contain a '$', we do not condition
1501 their acceptance on the -std= setting. */
1502 cpp_opts->warn_dollars = (cpp_opts->pedantic && !cpp_opts->c99);
1504 cb_file_change (parse_in,
1505 linemap_add (&line_table, LC_RENAME, 0,
1506 _("<command-line>"), 0));
1508 for (i = 0; i < deferred_count; i++)
1510 struct deferred_opt *opt = &deferred_opts[i];
1512 if (opt->code == OPT_D)
1513 cpp_define (parse_in, opt->arg);
1514 else if (opt->code == OPT_U)
1515 cpp_undef (parse_in, opt->arg);
1516 else if (opt->code == OPT_A)
1518 if (opt->arg[0] == '-')
1519 cpp_unassert (parse_in, opt->arg + 1);
1521 cpp_assert (parse_in, opt->arg);
1525 /* Handle -imacros after -D and -U. */
1526 for (i = 0; i < deferred_count; i++)
1528 struct deferred_opt *opt = &deferred_opts[i];
1530 if (opt->code == OPT_imacros
1531 && cpp_push_include (parse_in, opt->arg))
1533 /* Disable push_command_line_include callback for now. */
1534 include_cursor = deferred_count + 1;
1535 cpp_scan_nooutput (parse_in);
1539 else if (cpp_opts->directives_only)
1540 cpp_init_special_builtins (parse_in);
1543 push_command_line_include ();
1546 /* Give CPP the next file given by -include, if any. */
1548 push_command_line_include (void)
1550 while (include_cursor < deferred_count)
1552 struct deferred_opt *opt = &deferred_opts[include_cursor++];
1554 if (!cpp_opts->preprocessed && opt->code == OPT_include
1555 && cpp_push_include (parse_in, opt->arg))
1559 if (include_cursor == deferred_count)
1562 /* -Wunused-macros should only warn about macros defined hereafter. */
1563 cpp_opts->warn_unused_macros = warn_unused_macros;
1564 /* Restore the line map from <command line>. */
1565 if (!cpp_opts->preprocessed)
1566 cpp_change_file (parse_in, LC_RENAME, this_input_filename);
1568 /* Set this here so the client can change the option if it wishes,
1569 and after stacking the main file so we don't trace the main file. */
1570 line_table.trace_includes = cpp_opts->print_include_names;
1574 /* File change callback. Has to handle -include files. */
1576 cb_file_change (cpp_reader * ARG_UNUSED (pfile),
1577 const struct line_map *new_map)
1579 if (flag_preprocess_only)
1580 pp_file_change (new_map);
1582 fe_file_change (new_map);
1584 if (new_map == 0 || (new_map->reason == LC_LEAVE && MAIN_FILE_P (new_map)))
1585 push_command_line_include ();
1589 cb_dir_change (cpp_reader * ARG_UNUSED (pfile), const char *dir)
1591 if (!set_src_pwd (dir))
1592 warning (0, "too late for # directive to set debug directory");
1595 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1596 extensions if ISO). There is no concept of gnu94. */
1598 set_std_c89 (int c94, int iso)
1600 cpp_set_lang (parse_in, c94 ? CLK_STDC94: iso ? CLK_STDC89: CLK_GNUC89);
1603 flag_no_gnu_keywords = iso;
1604 flag_no_nonansi_builtin = iso;
1609 /* Set the C 99 standard (without GNU extensions if ISO). */
1611 set_std_c99 (int iso)
1613 cpp_set_lang (parse_in, iso ? CLK_STDC99: CLK_GNUC99);
1615 flag_no_nonansi_builtin = iso;
1621 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1623 set_std_cxx98 (int iso)
1625 cpp_set_lang (parse_in, iso ? CLK_CXX98: CLK_GNUCXX);
1626 flag_no_gnu_keywords = iso;
1627 flag_no_nonansi_builtin = iso;
1629 cxx_dialect = cxx98;
1632 /* Set the C++ 0x working draft "standard" (without GNU extensions if ISO). */
1634 set_std_cxx0x (int iso)
1636 cpp_set_lang (parse_in, iso ? CLK_CXX0X: CLK_GNUCXX0X);
1637 flag_no_gnu_keywords = iso;
1638 flag_no_nonansi_builtin = iso;
1640 cxx_dialect = cxx0x;
1643 /* Handle setting implicit to ON. */
1645 set_Wimplicit (int on)
1648 warn_implicit_int = on;
1649 warn_implicit_function_declaration = on;
1652 /* Args to -d specify what to dump. Silently ignore
1653 unrecognized options; they may be aimed at toplev.c. */
1655 handle_OPT_d (const char *arg)
1659 while ((c = *arg++) != '\0')
1662 case 'M': /* Dump macros only. */
1663 case 'N': /* Dump names. */
1664 case 'D': /* Dump definitions. */
1665 flag_dump_macros = c;
1669 flag_dump_includes = 1;