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_fdollars_in_identifiers:
622 cpp_opts->dollars_in_ident = value;
625 case OPT_ffreestanding:
627 /* Fall through.... */
630 flag_no_builtin = !value;
631 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
632 if (!value && warn_main == 2)
636 case OPT_fshort_double:
637 flag_short_double = value;
640 case OPT_fshort_enums:
641 flag_short_enums = value;
644 case OPT_fshort_wchar:
645 flag_short_wchar = value;
648 case OPT_fsigned_bitfields:
649 flag_signed_bitfields = value;
652 case OPT_fsigned_char:
653 flag_signed_char = value;
656 case OPT_funsigned_bitfields:
657 flag_signed_bitfields = !value;
660 case OPT_funsigned_char:
661 flag_signed_char = !value;
665 flag_check_new = value;
668 case OPT_fconserve_space:
669 flag_conserve_space = value;
672 case OPT_fconstant_string_class_:
673 constant_string_class_name = arg;
676 case OPT_fdefault_inline:
677 flag_default_inline = value;
680 case OPT_felide_constructors:
681 flag_elide_constructors = value;
684 case OPT_fenforce_eh_specs:
685 flag_enforce_eh_specs = value;
688 case OPT_fextended_identifiers:
689 cpp_opts->extended_identifiers = value;
693 flag_new_for_scope = value;
696 case OPT_fgnu_keywords:
697 flag_no_gnu_keywords = !value;
700 case OPT_fgnu_runtime:
701 flag_next_runtime = !value;
704 case OPT_fhandle_exceptions:
705 warning (0, "-fhandle-exceptions has been renamed -fexceptions (and is now on by default)");
706 flag_exceptions = value;
709 case OPT_fimplement_inlines:
710 flag_implement_inlines = value;
713 case OPT_fimplicit_inline_templates:
714 flag_implicit_inline_templates = value;
717 case OPT_fimplicit_templates:
718 flag_implicit_templates = value;
721 case OPT_flax_vector_conversions:
722 flag_lax_vector_conversions = value;
725 case OPT_fms_extensions:
726 flag_ms_extensions = value;
729 case OPT_fnext_runtime:
730 flag_next_runtime = value;
733 case OPT_fnil_receivers:
734 flag_nil_receivers = value;
737 case OPT_fnonansi_builtins:
738 flag_no_nonansi_builtin = !value;
741 case OPT_foperator_names:
742 cpp_opts->operator_names = value;
745 case OPT_foptional_diags:
746 flag_optional_diags = value;
750 cpp_opts->restore_pch_deps = value;
753 case OPT_fpch_preprocess:
754 flag_pch_preprocess = value;
757 case OPT_fpermissive:
758 flag_permissive = value;
761 case OPT_fpreprocessed:
762 cpp_opts->preprocessed = value;
765 case OPT_freplace_objc_classes:
766 flag_replace_objc_classes = value;
770 flag_use_repository = value;
772 flag_implicit_templates = 0;
779 case OPT_fshow_column:
780 cpp_opts->show_column = value;
784 flag_detailed_statistics = value;
788 /* It is documented that we silently ignore silly values. */
789 if (value >= 1 && value <= 100)
790 cpp_opts->tabstop = value;
793 case OPT_fexec_charset_:
794 cpp_opts->narrow_charset = arg;
797 case OPT_fwide_exec_charset_:
798 cpp_opts->wide_charset = arg;
801 case OPT_finput_charset_:
802 cpp_opts->input_charset = arg;
805 case OPT_ftemplate_depth_:
806 max_tinst_depth = value;
809 case OPT_fuse_cxa_atexit:
810 flag_use_cxa_atexit = value;
813 case OPT_fuse_cxa_get_exception_ptr:
814 flag_use_cxa_get_exception_ptr = value;
817 case OPT_fvisibility_inlines_hidden:
818 visibility_options.inlines_hidden = value;
825 case OPT_fthreadsafe_statics:
826 flag_threadsafe_statics = value;
830 flag_zero_link = value;
834 flag_gen_declaration = 1;
837 case OPT_femit_struct_debug_baseonly:
838 set_struct_debug_option ("base");
841 case OPT_femit_struct_debug_reduced:
842 set_struct_debug_option ("dir:ord:sys,dir:gen:any,ind:base");
845 case OPT_femit_struct_debug_detailed_:
846 set_struct_debug_option (arg);
850 add_path (xstrdup (arg), AFTER, 0, true);
855 defer_opt (code, arg);
867 add_path (xstrdup (arg), QUOTE, 0, true);
875 add_path (xstrdup (arg), SYSTEM, 0, true);
878 case OPT_iwithprefix:
879 add_prefixed_path (arg, SYSTEM);
882 case OPT_iwithprefixbefore:
883 add_prefixed_path (arg, BRACKET);
887 cpp_set_lang (parse_in, CLK_ASM);
888 cpp_opts->dollars_in_ident = false;
891 case OPT_lang_fortran:
911 error ("output filename specified twice");
914 /* We need to handle the -pedantic switches here, rather than in
915 c_common_post_options, so that a subsequent -Wno-endif-labels
916 is not overridden. */
917 case OPT_pedantic_errors:
918 cpp_opts->pedantic_errors = 1;
921 cpp_opts->pedantic = 1;
922 cpp_opts->warn_endif_labels = 1;
923 if (warn_pointer_sign == -1)
924 warn_pointer_sign = 1;
925 if (warn_overlength_strings == -1)
926 warn_overlength_strings = 1;
929 case OPT_print_objc_runtime_info:
930 print_struct_values = 1;
933 case OPT_print_pch_checksum:
934 c_common_print_pch_checksum (stdout);
935 exit_after_options = true;
943 case OPT_std_gnu__98:
944 if (!preprocessing_asm_p)
945 set_std_cxx98 (code == OPT_std_c__98 /* ISO */);
949 case OPT_std_gnu__0x:
950 if (!preprocessing_asm_p)
951 set_std_cxx0x (code == OPT_std_c__0x /* ISO */);
955 case OPT_std_iso9899_1990:
956 case OPT_std_iso9899_199409:
957 if (!preprocessing_asm_p)
958 set_std_c89 (code == OPT_std_iso9899_199409 /* c94 */, true /* ISO */);
962 if (!preprocessing_asm_p)
963 set_std_c89 (false /* c94 */, false /* ISO */);
968 case OPT_std_iso9899_1999:
969 case OPT_std_iso9899_199x:
970 if (!preprocessing_asm_p)
971 set_std_c99 (true /* ISO */);
976 if (!preprocessing_asm_p)
977 set_std_c99 (false /* ISO */);
981 cpp_opts->trigraphs = 1;
984 case OPT_traditional_cpp:
985 cpp_opts->traditional = 1;
993 cpp_opts->inhibit_warnings = 1;
1004 /* Post-switch processing. */
1006 c_common_post_options (const char **pfilename)
1008 struct cpp_callbacks *cb;
1010 /* Canonicalize the input and output filenames. */
1011 if (in_fnames == NULL)
1013 in_fnames = XNEWVEC (const char *, 1);
1016 else if (strcmp (in_fnames[0], "-") == 0)
1019 if (out_fname == NULL || !strcmp (out_fname, "-"))
1022 if (cpp_opts->deps.style == DEPS_NONE)
1023 check_deps_environment_vars ();
1025 handle_deferred_opts ();
1027 sanitize_cpp_opts ();
1029 register_include_chains (parse_in, sysroot, iprefix, imultilib,
1030 std_inc, std_cxx_inc && c_dialect_cxx (), verbose);
1032 #ifdef C_COMMON_OVERRIDE_OPTIONS
1033 /* Some machines may reject certain combinations of C
1034 language-specific options. */
1035 C_COMMON_OVERRIDE_OPTIONS;
1038 flag_inline_trees = 1;
1040 /* Use tree inlining. */
1041 if (!flag_no_inline)
1043 if (flag_inline_functions)
1044 flag_inline_trees = 2;
1046 /* By default we use C99 inline semantics in GNU99 or C99 mode. C99
1047 inline semantics are not supported in GNU89 or C89 mode. */
1048 if (flag_gnu89_inline == -1)
1049 flag_gnu89_inline = !flag_isoc99;
1050 else if (!flag_gnu89_inline && !flag_isoc99)
1051 error ("-fno-gnu89-inline is only supported in GNU99 or C99 mode");
1053 /* If we are given more than one input file, we must use
1054 unit-at-a-time mode. */
1055 if (num_in_fnames > 1)
1056 flag_unit_at_a_time = 1;
1058 /* Default to ObjC sjlj exception handling if NeXT runtime. */
1059 if (flag_objc_sjlj_exceptions < 0)
1060 flag_objc_sjlj_exceptions = flag_next_runtime;
1061 if (flag_objc_exceptions && !flag_objc_sjlj_exceptions)
1062 flag_exceptions = 1;
1064 /* -Wextra implies -Wtype-limits, -Wclobbered,
1065 -Wempty-body, -Wsign-compare,
1066 -Wmissing-field-initializers, -Wmissing-parameter-type
1067 -Wold-style-declaration, and -Woverride-init,
1068 but not if explicitly overridden. */
1069 if (warn_type_limits == -1)
1070 warn_type_limits = extra_warnings;
1071 if (warn_clobbered == -1)
1072 warn_clobbered = extra_warnings;
1073 if (warn_empty_body == -1)
1074 warn_empty_body = extra_warnings;
1075 if (warn_sign_compare == -1)
1076 warn_sign_compare = extra_warnings;
1077 if (warn_missing_field_initializers == -1)
1078 warn_missing_field_initializers = extra_warnings;
1079 if (warn_missing_parameter_type == -1)
1080 warn_missing_parameter_type = extra_warnings;
1081 if (warn_old_style_declaration == -1)
1082 warn_old_style_declaration = extra_warnings;
1083 if (warn_override_init == -1)
1084 warn_override_init = extra_warnings;
1086 /* -Wpointer_sign is disabled by default, but it is enabled if any
1087 of -Wall or -pedantic are given. */
1088 if (warn_pointer_sign == -1)
1089 warn_pointer_sign = 0;
1091 /* -Woverlength-strings is off by default, but is enabled by -pedantic.
1092 It is never enabled in C++, as the minimum limit is not normative
1093 in that standard. */
1094 if (warn_overlength_strings == -1 || c_dialect_cxx ())
1095 warn_overlength_strings = 0;
1097 /* Adjust various flags for C++ based on command-line settings. */
1098 if (c_dialect_cxx ())
1100 if (!flag_permissive)
1102 flag_pedantic_errors = 1;
1103 cpp_opts->pedantic_errors = 1;
1105 if (!flag_no_inline)
1107 flag_inline_trees = 1;
1110 if (flag_inline_functions)
1111 flag_inline_trees = 2;
1114 /* In C, -Wconversion enables -Wsign-conversion (unless disabled
1115 through -Wno-sign-conversion). While in C++,
1116 -Wsign-conversion needs to be requested explicitly. */
1117 if (warn_sign_conversion == -1)
1118 warn_sign_conversion = (c_dialect_cxx ()) ? 0 : warn_conversion;
1121 /* Special format checking options don't work without -Wformat; warn if
1125 warning (OPT_Wformat_y2k,
1126 "-Wformat-y2k ignored without -Wformat");
1127 warning (OPT_Wformat_extra_args,
1128 "-Wformat-extra-args ignored without -Wformat");
1129 warning (OPT_Wformat_zero_length,
1130 "-Wformat-zero-length ignored without -Wformat");
1131 warning (OPT_Wformat_nonliteral,
1132 "-Wformat-nonliteral ignored without -Wformat");
1133 warning (OPT_Wformat_contains_nul,
1134 "-Wformat-contains-nul ignored without -Wformat");
1135 warning (OPT_Wformat_security,
1136 "-Wformat-security ignored without -Wformat");
1139 /* -Wimplicit-function-declaration is enabled by default for C99. */
1140 if (warn_implicit_function_declaration == -1)
1141 warn_implicit_function_declaration = flag_isoc99;
1143 /* If we're allowing C++0x constructs, don't warn about C++0x
1144 compatibility problems. */
1145 if (cxx_dialect == cxx0x)
1146 warn_cxx0x_compat = 0;
1148 if (flag_preprocess_only)
1150 /* Open the output now. We must do so even if flag_no_output is
1151 on, because there may be other output than from the actual
1152 preprocessing (e.g. from -dM). */
1153 if (out_fname[0] == '\0')
1154 out_stream = stdout;
1156 out_stream = fopen (out_fname, "w");
1158 if (out_stream == NULL)
1160 fatal_error ("opening output file %s: %m", out_fname);
1164 if (num_in_fnames > 1)
1165 error ("too many filenames given. Type %s --help for usage",
1168 init_pp_output (out_stream);
1174 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1175 input_location = UNKNOWN_LOCATION;
1178 cb = cpp_get_callbacks (parse_in);
1179 cb->file_change = cb_file_change;
1180 cb->dir_change = cb_dir_change;
1181 cpp_post_options (parse_in);
1183 input_location = UNKNOWN_LOCATION;
1185 /* If an error has occurred in cpplib, note it so we fail
1187 errorcount += cpp_errors (parse_in);
1189 *pfilename = this_input_filename
1190 = cpp_read_main_file (parse_in, in_fnames[0]);
1191 /* Don't do any compilation or preprocessing if there is no input file. */
1192 if (this_input_filename == NULL)
1198 if (flag_working_directory
1199 && flag_preprocess_only && !flag_no_line_commands)
1200 pp_dir_change (parse_in, get_src_pwd ());
1202 return flag_preprocess_only;
1205 /* Front end initialization common to C, ObjC and C++. */
1207 c_common_init (void)
1209 /* Set up preprocessor arithmetic. Must be done after call to
1210 c_common_nodes_and_builtins for type nodes to be good. */
1211 cpp_opts->precision = TYPE_PRECISION (intmax_type_node);
1212 cpp_opts->char_precision = TYPE_PRECISION (char_type_node);
1213 cpp_opts->int_precision = TYPE_PRECISION (integer_type_node);
1214 cpp_opts->wchar_precision = TYPE_PRECISION (wchar_type_node);
1215 cpp_opts->unsigned_wchar = TYPE_UNSIGNED (wchar_type_node);
1216 cpp_opts->bytes_big_endian = BYTES_BIG_ENDIAN;
1218 /* This can't happen until after wchar_precision and bytes_big_endian
1220 cpp_init_iconv (parse_in);
1223 c_common_print_pch_checksum (stderr);
1225 if (flag_preprocess_only)
1228 preprocess_file (parse_in);
1232 /* Has to wait until now so that cpplib has its hash table. */
1238 /* Initialize the integrated preprocessor after debug output has been
1239 initialized; loop over each input file. */
1241 c_common_parse_file (int set_yydebug)
1249 warning(0, "The C parser does not support -dy, option ignored");
1253 "The Objective-C parser does not support -dy, option ignored");
1256 warning(0, "The C++ parser does not support -dy, option ignored");
1260 "The Objective-C++ parser does not support -dy, option ignored");
1269 /* Start the main input file, if the debug writer wants it. */
1270 if (debug_hooks->start_end_main_source_file)
1271 (*debug_hooks->start_source_file) (0, this_input_filename);
1278 /* And end the main input file, if the debug writer wants it */
1279 if (debug_hooks->start_end_main_source_file)
1280 (*debug_hooks->end_source_file) (0);
1281 if (++i >= num_in_fnames)
1283 cpp_undef_all (parse_in);
1285 = cpp_read_main_file (parse_in, in_fnames[i]);
1286 /* If an input file is missing, abandon further compilation.
1287 cpplib has issued a diagnostic. */
1288 if (!this_input_filename)
1293 /* Common finish hook for the C, ObjC and C++ front ends. */
1295 c_common_finish (void)
1297 FILE *deps_stream = NULL;
1299 if (cpp_opts->deps.style != DEPS_NONE)
1301 /* If -M or -MM was seen without -MF, default output to the
1304 deps_stream = out_stream;
1307 deps_stream = fopen (deps_file, deps_append ? "a": "w");
1309 fatal_error ("opening dependency file %s: %m", deps_file);
1313 /* For performance, avoid tearing down cpplib's internal structures
1314 with cpp_destroy (). */
1315 errorcount += cpp_finish (parse_in, deps_stream);
1317 if (deps_stream && deps_stream != out_stream
1318 && (ferror (deps_stream) || fclose (deps_stream)))
1319 fatal_error ("closing dependency file %s: %m", deps_file);
1321 if (out_stream && (ferror (out_stream) || fclose (out_stream)))
1322 fatal_error ("when writing output to %s: %m", out_fname);
1325 /* Either of two environment variables can specify output of
1326 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1327 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1328 and DEPS_TARGET is the target to mention in the deps. They also
1329 result in dependency information being appended to the output file
1330 rather than overwriting it, and like Sun's compiler
1331 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1333 check_deps_environment_vars (void)
1337 GET_ENVIRONMENT (spec, "DEPENDENCIES_OUTPUT");
1339 cpp_opts->deps.style = DEPS_USER;
1342 GET_ENVIRONMENT (spec, "SUNPRO_DEPENDENCIES");
1345 cpp_opts->deps.style = DEPS_SYSTEM;
1346 cpp_opts->deps.ignore_main_file = true;
1352 /* Find the space before the DEPS_TARGET, if there is one. */
1353 char *s = strchr (spec, ' ');
1356 /* Let the caller perform MAKE quoting. */
1357 defer_opt (OPT_MT, s + 1);
1361 /* Command line -MF overrides environment variables and default. */
1370 /* Handle deferred command line switches. */
1372 handle_deferred_opts (void)
1377 /* Avoid allocating the deps buffer if we don't need it.
1378 (This flag may be true without there having been -MT or -MQ
1379 options, but we'll still need the deps buffer.) */
1383 deps = cpp_get_deps (parse_in);
1385 for (i = 0; i < deferred_count; i++)
1387 struct deferred_opt *opt = &deferred_opts[i];
1389 if (opt->code == OPT_MT || opt->code == OPT_MQ)
1390 deps_add_target (deps, opt->arg, opt->code == OPT_MQ);
1394 /* These settings are appropriate for GCC, but not necessarily so for
1395 cpplib as a library. */
1397 sanitize_cpp_opts (void)
1399 /* If we don't know what style of dependencies to output, complain
1400 if any other dependency switches have been given. */
1401 if (deps_seen && cpp_opts->deps.style == DEPS_NONE)
1402 error ("to generate dependencies you must specify either -M or -MM");
1404 /* -dM and dependencies suppress normal output; do it here so that
1405 the last -d[MDN] switch overrides earlier ones. */
1406 if (flag_dump_macros == 'M')
1409 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1410 -dM since at least glibc relies on -M -dM to work. */
1411 /* Also, flag_no_output implies flag_no_line_commands, always. */
1414 if (flag_dump_macros != 'M')
1415 flag_dump_macros = 0;
1416 flag_dump_includes = 0;
1417 flag_no_line_commands = 1;
1420 cpp_opts->unsigned_char = !flag_signed_char;
1421 cpp_opts->stdc_0_in_system_headers = STDC_0_IN_SYSTEM_HEADERS;
1423 /* We want -Wno-long-long to override -pedantic -std=non-c99
1424 and/or -Wtraditional, whatever the ordering. */
1425 cpp_opts->warn_long_long
1426 = warn_long_long && ((!flag_isoc99 && pedantic) || warn_traditional);
1428 /* Similarly with -Wno-variadic-macros. No check for c99 here, since
1429 this also turns off warnings about GCCs extension. */
1430 cpp_opts->warn_variadic_macros
1431 = warn_variadic_macros && (pedantic || warn_traditional);
1433 /* If we're generating preprocessor output, emit current directory
1434 if explicitly requested or if debugging information is enabled.
1435 ??? Maybe we should only do it for debugging formats that
1436 actually output the current directory? */
1437 if (flag_working_directory == -1)
1438 flag_working_directory = (debug_info_level != DINFO_LEVEL_NONE);
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);
1524 push_command_line_include ();
1527 /* Give CPP the next file given by -include, if any. */
1529 push_command_line_include (void)
1531 while (include_cursor < deferred_count)
1533 struct deferred_opt *opt = &deferred_opts[include_cursor++];
1535 if (!cpp_opts->preprocessed && opt->code == OPT_include
1536 && cpp_push_include (parse_in, opt->arg))
1540 if (include_cursor == deferred_count)
1543 /* -Wunused-macros should only warn about macros defined hereafter. */
1544 cpp_opts->warn_unused_macros = warn_unused_macros;
1545 /* Restore the line map from <command line>. */
1546 if (!cpp_opts->preprocessed)
1547 cpp_change_file (parse_in, LC_RENAME, this_input_filename);
1549 /* Set this here so the client can change the option if it wishes,
1550 and after stacking the main file so we don't trace the main file. */
1551 line_table.trace_includes = cpp_opts->print_include_names;
1555 /* File change callback. Has to handle -include files. */
1557 cb_file_change (cpp_reader * ARG_UNUSED (pfile),
1558 const struct line_map *new_map)
1560 if (flag_preprocess_only)
1561 pp_file_change (new_map);
1563 fe_file_change (new_map);
1565 if (new_map == 0 || (new_map->reason == LC_LEAVE && MAIN_FILE_P (new_map)))
1566 push_command_line_include ();
1570 cb_dir_change (cpp_reader * ARG_UNUSED (pfile), const char *dir)
1572 if (!set_src_pwd (dir))
1573 warning (0, "too late for # directive to set debug directory");
1576 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1577 extensions if ISO). There is no concept of gnu94. */
1579 set_std_c89 (int c94, int iso)
1581 cpp_set_lang (parse_in, c94 ? CLK_STDC94: iso ? CLK_STDC89: CLK_GNUC89);
1584 flag_no_gnu_keywords = iso;
1585 flag_no_nonansi_builtin = iso;
1590 /* Set the C 99 standard (without GNU extensions if ISO). */
1592 set_std_c99 (int iso)
1594 cpp_set_lang (parse_in, iso ? CLK_STDC99: CLK_GNUC99);
1596 flag_no_nonansi_builtin = iso;
1602 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1604 set_std_cxx98 (int iso)
1606 cpp_set_lang (parse_in, iso ? CLK_CXX98: CLK_GNUCXX);
1607 flag_no_gnu_keywords = iso;
1608 flag_no_nonansi_builtin = iso;
1610 cxx_dialect = cxx98;
1613 /* Set the C++ 0x working draft "standard" (without GNU extensions if ISO). */
1615 set_std_cxx0x (int iso)
1617 cpp_set_lang (parse_in, iso ? CLK_CXX0X: CLK_GNUCXX0X);
1618 flag_no_gnu_keywords = iso;
1619 flag_no_nonansi_builtin = iso;
1621 cxx_dialect = cxx0x;
1624 /* Handle setting implicit to ON. */
1626 set_Wimplicit (int on)
1629 warn_implicit_int = on;
1630 warn_implicit_function_declaration = on;
1633 /* Args to -d specify what to dump. Silently ignore
1634 unrecognized options; they may be aimed at toplev.c. */
1636 handle_OPT_d (const char *arg)
1640 while ((c = *arg++) != '\0')
1643 case 'M': /* Dump macros only. */
1644 case 'N': /* Dump names. */
1645 case 'D': /* Dump definitions. */
1646 flag_dump_macros = c;
1650 flag_dump_includes = 1;