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. */
43 #include "c-tree.h" /* For c_cpp_error. */
45 #ifndef DOLLARS_IN_IDENTIFIERS
46 # define DOLLARS_IN_IDENTIFIERS true
49 #ifndef TARGET_SYSTEM_ROOT
50 # define TARGET_SYSTEM_ROOT NULL
54 #define TARGET_OPTF(ARG)
58 cpp_options *cpp_opts;
61 static const char *this_input_filename;
63 /* Filename and stream for preprocessed output. */
64 static const char *out_fname;
65 static FILE *out_stream;
67 /* Append dependencies to deps_file. */
68 static bool deps_append;
70 /* If dependency switches (-MF etc.) have been given. */
71 static bool deps_seen;
76 /* Dependency output file. */
77 static const char *deps_file;
79 /* The prefix given by -iprefix, if any. */
80 static const char *iprefix;
82 /* The multilib directory given by -imultilib, if any. */
83 static const char *imultilib;
85 /* The system root, if any. Overridden by -isysroot. */
86 static const char *sysroot = TARGET_SYSTEM_ROOT;
88 /* Zero disables all standard directories for headers. */
89 static bool std_inc = true;
91 /* Zero disables the C++-specific standard directories for headers. */
92 static bool std_cxx_inc = true;
94 /* If the quote chain has been split by -I-. */
95 static bool quote_chain_split;
97 /* If -Wunused-macros. */
98 static bool warn_unused_macros;
100 /* If -Wvariadic-macros. */
101 static bool warn_variadic_macros = true;
103 /* Number of deferred options. */
104 static size_t deferred_count;
106 /* Number of deferred options scanned for -include. */
107 static size_t include_cursor;
109 static void set_Wimplicit (int);
110 static void handle_OPT_d (const char *);
111 static void set_std_cxx98 (int);
112 static void set_std_cxx0x (int);
113 static void set_std_c89 (int, int);
114 static void set_std_c99 (int);
115 static void check_deps_environment_vars (void);
116 static void handle_deferred_opts (void);
117 static void sanitize_cpp_opts (void);
118 static void add_prefixed_path (const char *, size_t);
119 static void push_command_line_include (void);
120 static void cb_file_change (cpp_reader *, const struct line_map *);
121 static void cb_dir_change (cpp_reader *, const char *);
122 static void finish_options (void);
124 #ifndef STDC_0_IN_SYSTEM_HEADERS
125 #define STDC_0_IN_SYSTEM_HEADERS 0
128 /* Holds switches parsed by c_common_handle_option (), but whose
129 handling is deferred to c_common_post_options (). */
130 static void defer_opt (enum opt_code, const char *);
131 static struct deferred_opt
137 /* Complain that switch CODE expects an argument but none was
138 provided. OPT was the command-line option. Return FALSE to get
139 the default message in opts.c, TRUE if we provide a specialized
142 c_common_missing_argument (const char *opt, size_t code)
147 /* Pick up the default message. */
150 case OPT_fconstant_string_class_:
151 error ("no class name specified with %qs", opt);
155 error ("assertion missing after %qs", opt);
160 error ("macro name missing after %qs", opt);
169 error ("missing path after %qs", opt);
178 error ("missing filename after %qs", opt);
183 error ("missing makefile target after %qs", opt);
190 /* Defer option CODE with argument ARG. */
192 defer_opt (enum opt_code code, const char *arg)
194 deferred_opts[deferred_count].code = code;
195 deferred_opts[deferred_count].arg = arg;
199 /* Common initialization before parsing options. */
201 c_common_init_options (unsigned int argc, const char **argv)
203 static const unsigned int lang_flags[] = {CL_C, CL_ObjC, CL_CXX, CL_ObjCXX};
204 unsigned int i, result;
205 struct cpp_callbacks *cb;
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);
221 cb = cpp_get_callbacks (parse_in);
222 cb->error = c_cpp_error;
224 cpp_opts = cpp_get_options (parse_in);
225 cpp_opts->dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
226 cpp_opts->objc = c_dialect_objc ();
228 /* Reset to avoid warnings on internal definitions. We set it just
229 before passing on command-line options to cpplib. */
230 cpp_opts->warn_dollars = 0;
232 flag_exceptions = c_dialect_cxx ();
233 warn_pointer_arith = c_dialect_cxx ();
234 warn_write_strings = c_dialect_cxx();
235 flag_warn_unused_result = true;
237 /* By default, C99-like requirements for complex multiply and divide. */
238 flag_complex_method = 2;
240 deferred_opts = XNEWVEC (struct deferred_opt, argc);
242 result = lang_flags[c_language];
244 if (c_language == clk_c)
246 /* If preprocessing assembly language, accept any of the C-family
247 front end options since the driver may pass them through. */
248 for (i = 1; i < argc; i++)
249 if (! strcmp (argv[i], "-lang-asm"))
251 result |= CL_C | CL_ObjC | CL_CXX | CL_ObjCXX;
259 /* Handle switch SCODE with argument ARG. VALUE is true, unless no-
260 form of an -f or -W option was given. Returns 0 if the switch was
261 invalid, a negative number to prevent language-independent
262 processing in toplev.c (a hack necessary for the short-term). */
264 c_common_handle_option (size_t scode, const char *arg, int value)
266 const struct cl_option *option = &cl_options[scode];
267 enum opt_code code = (enum opt_code) scode;
270 /* Prevent resetting the language standard to a C dialect when the driver
271 has already determined that we're looking at assembler input. */
272 bool preprocessing_asm_p = (cpp_get_options (parse_in)->lang == CLK_ASM);
277 if (cl_options[code].flags & (CL_C | CL_CXX | CL_ObjC | CL_ObjCXX))
279 if ((option->flags & CL_TARGET)
280 && ! targetcm.handle_c_option (scode, arg, value))
287 case OPT__output_pch_:
292 defer_opt (code, arg);
296 cpp_opts->discard_comments = 0;
300 cpp_opts->discard_comments = 0;
301 cpp_opts->discard_comments_in_macro_exp = 0;
305 defer_opt (code, arg);
309 flag_preprocess_only = 1;
313 cpp_opts->print_include_names = 1;
317 TARGET_OPTF (xstrdup (arg));
321 if (strcmp (arg, "-"))
322 add_path (xstrdup (arg), BRACKET, 0, true);
325 if (quote_chain_split)
326 error ("-I- specified twice");
327 quote_chain_split = true;
328 split_quote_chain ();
329 inform (input_location, "obsolete option -I- used, please use -iquote instead");
335 /* When doing dependencies with -M or -MM, suppress normal
336 preprocessed output, but still do -dM etc. as software
337 depends on this. Preprocessed output does occur if -MD, -MMD
338 or environment var dependency generation is used. */
339 cpp_opts->deps.style = (code == OPT_M ? DEPS_SYSTEM: DEPS_USER);
345 cpp_opts->deps.style = (code == OPT_MD ? DEPS_SYSTEM: DEPS_USER);
346 cpp_opts->deps.need_preprocessor_output = true;
357 cpp_opts->deps.missing_files = true;
362 cpp_opts->deps.phony_targets = true;
368 defer_opt (code, arg);
372 flag_no_line_commands = 1;
375 case OPT_fworking_directory:
376 flag_working_directory = value;
380 defer_opt (code, arg);
386 set_Wimplicit (value);
387 warn_char_subscripts = value;
388 warn_missing_braces = value;
389 warn_parentheses = value;
390 warn_return_type = value;
391 warn_sequence_point = value; /* Was C only. */
393 if (warn_strict_aliasing == -1)
394 set_Wstrict_aliasing (value);
395 warn_address = value;
396 if (warn_strict_overflow == -1)
397 warn_strict_overflow = value;
398 warn_array_bounds = value;
399 warn_volatile_register_var = value;
400 if (warn_jump_misses_init == -1)
401 warn_jump_misses_init = value;
403 /* Only warn about unknown pragmas that are not in system
405 warn_unknown_pragmas = value;
407 warn_uninitialized = value;
409 if (!c_dialect_cxx ())
411 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding
412 can turn it off only if it's not explicit. */
414 warn_main = (value ? 2 : 0);
416 /* In C, -Wall turns on -Wenum-compare, which we do here.
417 In C++ it is on by default, which is done in
418 c_common_post_options. */
419 if (warn_enum_compare == -1)
420 warn_enum_compare = value;
424 /* C++-specific warnings. */
425 warn_sign_compare = value;
426 warn_reorder = value;
427 warn_cxx0x_compat = value;
430 cpp_opts->warn_trigraphs = value;
431 cpp_opts->warn_comments = value;
432 cpp_opts->warn_num_sign_change = value;
434 if (warn_pointer_sign == -1)
435 warn_pointer_sign = value;
438 case OPT_Wbuiltin_macro_redefined:
439 cpp_opts->warn_builtin_macro_redefined = value;
444 cpp_opts->warn_comments = value;
447 case OPT_Wc___compat:
448 /* Because -Wenum-compare is the default in C++, -Wc++-compat
449 implies -Wenum-compare. */
450 if (warn_enum_compare == -1 && value)
451 warn_enum_compare = value;
452 /* Because C++ always warns about a goto which misses an
453 initialization, -Wc++-compat turns on -Wgoto-misses-init. */
454 if (warn_jump_misses_init == -1 && value)
455 warn_jump_misses_init = value;
456 cpp_opts->warn_cxx_operator_names = value;
459 case OPT_Wdeprecated:
460 cpp_opts->warn_deprecated = value;
463 case OPT_Wendif_labels:
464 cpp_opts->warn_endif_labels = value;
468 global_dc->warning_as_error_requested = value;
471 case OPT_Werror_implicit_function_declaration:
472 /* For backward compatibility, this is the same as
473 -Werror=implicit-function-declaration. */
474 enable_warning_as_error ("implicit-function-declaration", value, CL_C | CL_ObjC);
482 set_Wformat (atoi (arg));
486 set_Wimplicit (value);
490 /* Silently ignore for now. */
493 case OPT_Winvalid_pch:
494 cpp_opts->warn_invalid_pch = value;
497 case OPT_Wmissing_include_dirs:
498 cpp_opts->warn_missing_include_dirs = value;
502 cpp_opts->warn_multichar = value;
505 case OPT_Wnormalized_:
506 if (!value || (arg && strcasecmp (arg, "none") == 0))
507 cpp_opts->warn_normalize = normalized_none;
508 else if (!arg || strcasecmp (arg, "nfkc") == 0)
509 cpp_opts->warn_normalize = normalized_KC;
510 else if (strcasecmp (arg, "id") == 0)
511 cpp_opts->warn_normalize = normalized_identifier_C;
512 else if (strcasecmp (arg, "nfc") == 0)
513 cpp_opts->warn_normalize = normalized_C;
515 error ("argument %qs to %<-Wnormalized%> not recognized", arg);
518 case OPT_Wreturn_type:
519 warn_return_type = value;
522 case OPT_Wstrict_null_sentinel:
523 warn_strict_null_sentinel = value;
526 case OPT_Wtraditional:
527 cpp_opts->warn_traditional = value;
531 cpp_opts->warn_trigraphs = value;
535 cpp_opts->warn_undef = value;
538 case OPT_Wunknown_pragmas:
539 /* Set to greater than 1, so that even unknown pragmas in
540 system headers will be warned about. */
541 warn_unknown_pragmas = value * 2;
544 case OPT_Wunused_macros:
545 warn_unused_macros = value;
548 case OPT_Wvariadic_macros:
549 warn_variadic_macros = value;
552 case OPT_Wwrite_strings:
553 warn_write_strings = value;
559 warn_nonvdtor = true;
563 if (!c_dialect_cxx ())
564 set_std_c89 (false, true);
566 set_std_cxx98 (true);
573 case OPT_fcond_mismatch:
574 if (!c_dialect_cxx ())
576 flag_cond_mismatch = value;
581 case OPT_fall_virtual:
582 case OPT_falt_external_templates:
583 case OPT_fenum_int_equiv:
584 case OPT_fexternal_templates:
585 case OPT_fguiding_decls:
587 case OPT_fhuge_objects:
589 case OPT_fname_mangling_version_:
591 case OPT_fnonnull_objects:
593 case OPT_fstrict_prototype:
594 case OPT_fthis_is_variable:
595 case OPT_fvtable_thunks:
598 warning (0, "switch %qs is no longer supported", option->opt_text);
601 case OPT_faccess_control:
602 flag_access_control = value;
606 flag_no_asm = !value;
610 flag_no_builtin = !value;
617 disable_builtin_function (arg);
620 case OPT_fdirectives_only:
621 cpp_opts->directives_only = value;
624 case OPT_fdollars_in_identifiers:
625 cpp_opts->dollars_in_ident = value;
628 case OPT_ffreestanding:
630 /* Fall through.... */
633 flag_no_builtin = !value;
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;
829 case OPT_fpretty_templates:
830 flag_pretty_templates = 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;
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:
919 cpp_opts->pedantic = 1;
920 cpp_opts->warn_endif_labels = 1;
921 if (warn_pointer_sign == -1)
922 warn_pointer_sign = 1;
923 if (warn_overlength_strings == -1)
924 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;
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 /* Excess precision other than "fast" requires front-end
1040 if (c_dialect_cxx ())
1042 if (flag_excess_precision_cmdline == EXCESS_PRECISION_STANDARD
1043 && TARGET_FLT_EVAL_METHOD_NON_DEFAULT)
1044 sorry ("-fexcess-precision=standard for C++");
1045 flag_excess_precision_cmdline = EXCESS_PRECISION_FAST;
1047 else if (flag_excess_precision_cmdline == EXCESS_PRECISION_DEFAULT)
1048 flag_excess_precision_cmdline = (flag_iso
1049 ? EXCESS_PRECISION_STANDARD
1050 : EXCESS_PRECISION_FAST);
1052 /* By default we use C99 inline semantics in GNU99 or C99 mode. C99
1053 inline semantics are not supported in GNU89 or C89 mode. */
1054 if (flag_gnu89_inline == -1)
1055 flag_gnu89_inline = !flag_isoc99;
1056 else if (!flag_gnu89_inline && !flag_isoc99)
1057 error ("-fno-gnu89-inline is only supported in GNU99 or C99 mode");
1059 /* Default to ObjC sjlj exception handling if NeXT runtime. */
1060 if (flag_objc_sjlj_exceptions < 0)
1061 flag_objc_sjlj_exceptions = flag_next_runtime;
1062 if (flag_objc_exceptions && !flag_objc_sjlj_exceptions)
1063 flag_exceptions = 1;
1065 /* -Wextra implies the following flags
1066 unless explicitly overridden. */
1067 if (warn_type_limits == -1)
1068 warn_type_limits = extra_warnings;
1069 if (warn_clobbered == -1)
1070 warn_clobbered = extra_warnings;
1071 if (warn_empty_body == -1)
1072 warn_empty_body = extra_warnings;
1073 if (warn_sign_compare == -1)
1074 warn_sign_compare = extra_warnings;
1075 if (warn_missing_field_initializers == -1)
1076 warn_missing_field_initializers = extra_warnings;
1077 if (warn_missing_parameter_type == -1)
1078 warn_missing_parameter_type = extra_warnings;
1079 if (warn_old_style_declaration == -1)
1080 warn_old_style_declaration = extra_warnings;
1081 if (warn_override_init == -1)
1082 warn_override_init = extra_warnings;
1083 if (warn_ignored_qualifiers == -1)
1084 warn_ignored_qualifiers = 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 if (warn_strict_aliasing == -1)
1092 warn_strict_aliasing = 0;
1093 if (warn_strict_overflow == -1)
1094 warn_strict_overflow = 0;
1095 if (warn_jump_misses_init == -1)
1096 warn_jump_misses_init = 0;
1098 /* -Woverlength-strings is off by default, but is enabled by -pedantic.
1099 It is never enabled in C++, as the minimum limit is not normative
1100 in that standard. */
1101 if (warn_overlength_strings == -1 || c_dialect_cxx ())
1102 warn_overlength_strings = 0;
1104 /* Wmain is enabled by default in C++ but not in C. */
1105 /* Wmain is disabled by default for -ffreestanding (!flag_hosted),
1106 even if -Wall was given (warn_main will be 2 if set by -Wall, 1
1107 if set by -Wmain). */
1108 if (warn_main == -1)
1109 warn_main = (c_dialect_cxx () && flag_hosted) ? 1 : 0;
1110 else if (warn_main == 2)
1111 warn_main = flag_hosted ? 1 : 0;
1113 /* In C, -Wconversion enables -Wsign-conversion (unless disabled
1114 through -Wno-sign-conversion). While in C++,
1115 -Wsign-conversion needs to be requested explicitly. */
1116 if (warn_sign_conversion == -1)
1117 warn_sign_conversion = (c_dialect_cxx ()) ? 0 : warn_conversion;
1119 /* In C, -Wall and -Wc++-compat enable -Wenum-compare, which we do
1120 in c_common_handle_option; if it has not yet been set, it is
1121 disabled by default. In C++, it is enabled by default. */
1122 if (warn_enum_compare == -1)
1123 warn_enum_compare = c_dialect_cxx () ? 1 : 0;
1125 /* -Wpacked-bitfield-compat is on by default for the C languages. The
1126 warning is issued in stor-layout.c which is not part of the front-end so
1127 we need to selectively turn it on here. */
1128 if (warn_packed_bitfield_compat == -1)
1129 warn_packed_bitfield_compat = 1;
1131 /* Special format checking options don't work without -Wformat; warn if
1135 warning (OPT_Wformat_y2k,
1136 "-Wformat-y2k ignored without -Wformat");
1137 warning (OPT_Wformat_extra_args,
1138 "-Wformat-extra-args ignored without -Wformat");
1139 warning (OPT_Wformat_zero_length,
1140 "-Wformat-zero-length ignored without -Wformat");
1141 warning (OPT_Wformat_nonliteral,
1142 "-Wformat-nonliteral ignored without -Wformat");
1143 warning (OPT_Wformat_contains_nul,
1144 "-Wformat-contains-nul ignored without -Wformat");
1145 warning (OPT_Wformat_security,
1146 "-Wformat-security ignored without -Wformat");
1149 /* -Wimplicit-function-declaration is enabled by default for C99. */
1150 if (warn_implicit_function_declaration == -1)
1151 warn_implicit_function_declaration = flag_isoc99;
1153 /* If we're allowing C++0x constructs, don't warn about C++0x
1154 compatibility problems. */
1155 if (cxx_dialect == cxx0x)
1156 warn_cxx0x_compat = 0;
1158 if (flag_preprocess_only)
1160 /* Open the output now. We must do so even if flag_no_output is
1161 on, because there may be other output than from the actual
1162 preprocessing (e.g. from -dM). */
1163 if (out_fname[0] == '\0')
1164 out_stream = stdout;
1166 out_stream = fopen (out_fname, "w");
1168 if (out_stream == NULL)
1170 fatal_error ("opening output file %s: %m", out_fname);
1174 if (num_in_fnames > 1)
1175 error ("too many filenames given. Type %s --help for usage",
1178 init_pp_output (out_stream);
1184 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1185 input_location = UNKNOWN_LOCATION;
1188 cb = cpp_get_callbacks (parse_in);
1189 cb->file_change = cb_file_change;
1190 cb->dir_change = cb_dir_change;
1191 cpp_post_options (parse_in);
1193 input_location = UNKNOWN_LOCATION;
1195 *pfilename = this_input_filename
1196 = cpp_read_main_file (parse_in, in_fnames[0]);
1197 /* Don't do any compilation or preprocessing if there is no input file. */
1198 if (this_input_filename == NULL)
1204 if (flag_working_directory
1205 && flag_preprocess_only && !flag_no_line_commands)
1206 pp_dir_change (parse_in, get_src_pwd ());
1208 return flag_preprocess_only;
1211 /* Front end initialization common to C, ObjC and C++. */
1213 c_common_init (void)
1215 /* Set up preprocessor arithmetic. Must be done after call to
1216 c_common_nodes_and_builtins for type nodes to be good. */
1217 cpp_opts->precision = TYPE_PRECISION (intmax_type_node);
1218 cpp_opts->char_precision = TYPE_PRECISION (char_type_node);
1219 cpp_opts->int_precision = TYPE_PRECISION (integer_type_node);
1220 cpp_opts->wchar_precision = TYPE_PRECISION (wchar_type_node);
1221 cpp_opts->unsigned_wchar = TYPE_UNSIGNED (wchar_type_node);
1222 cpp_opts->bytes_big_endian = BYTES_BIG_ENDIAN;
1224 /* This can't happen until after wchar_precision and bytes_big_endian
1226 cpp_init_iconv (parse_in);
1229 c_common_print_pch_checksum (stderr);
1231 /* Has to wait until now so that cpplib has its hash table. */
1234 if (flag_preprocess_only)
1237 preprocess_file (parse_in);
1244 /* Initialize the integrated preprocessor after debug output has been
1245 initialized; loop over each input file. */
1247 c_common_parse_file (int set_yydebug)
1255 warning(0, "The C parser does not support -dy, option ignored");
1259 "The Objective-C parser does not support -dy, option ignored");
1262 warning(0, "The C++ parser does not support -dy, option ignored");
1266 "The Objective-C++ parser does not support -dy, option ignored");
1275 /* Start the main input file, if the debug writer wants it. */
1276 if (debug_hooks->start_end_main_source_file)
1277 (*debug_hooks->start_source_file) (0, this_input_filename);
1284 /* And end the main input file, if the debug writer wants it */
1285 if (debug_hooks->start_end_main_source_file)
1286 (*debug_hooks->end_source_file) (0);
1287 if (++i >= num_in_fnames)
1289 cpp_undef_all (parse_in);
1290 cpp_clear_file_cache (parse_in);
1292 = cpp_read_main_file (parse_in, in_fnames[i]);
1293 /* If an input file is missing, abandon further compilation.
1294 cpplib has issued a diagnostic. */
1295 if (!this_input_filename)
1300 /* Common finish hook for the C, ObjC and C++ front ends. */
1302 c_common_finish (void)
1304 FILE *deps_stream = NULL;
1306 /* Don't write the deps file if there are errors. */
1307 if (cpp_opts->deps.style != DEPS_NONE && errorcount == 0)
1309 /* If -M or -MM was seen without -MF, default output to the
1312 deps_stream = out_stream;
1315 deps_stream = fopen (deps_file, deps_append ? "a": "w");
1317 fatal_error ("opening dependency file %s: %m", deps_file);
1321 /* For performance, avoid tearing down cpplib's internal structures
1322 with cpp_destroy (). */
1323 cpp_finish (parse_in, deps_stream);
1325 if (deps_stream && deps_stream != out_stream
1326 && (ferror (deps_stream) || fclose (deps_stream)))
1327 fatal_error ("closing dependency file %s: %m", deps_file);
1329 if (out_stream && (ferror (out_stream) || fclose (out_stream)))
1330 fatal_error ("when writing output to %s: %m", out_fname);
1333 /* Either of two environment variables can specify output of
1334 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1335 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1336 and DEPS_TARGET is the target to mention in the deps. They also
1337 result in dependency information being appended to the output file
1338 rather than overwriting it, and like Sun's compiler
1339 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1341 check_deps_environment_vars (void)
1345 GET_ENVIRONMENT (spec, "DEPENDENCIES_OUTPUT");
1347 cpp_opts->deps.style = DEPS_USER;
1350 GET_ENVIRONMENT (spec, "SUNPRO_DEPENDENCIES");
1353 cpp_opts->deps.style = DEPS_SYSTEM;
1354 cpp_opts->deps.ignore_main_file = true;
1360 /* Find the space before the DEPS_TARGET, if there is one. */
1361 char *s = strchr (spec, ' ');
1364 /* Let the caller perform MAKE quoting. */
1365 defer_opt (OPT_MT, s + 1);
1369 /* Command line -MF overrides environment variables and default. */
1378 /* Handle deferred command line switches. */
1380 handle_deferred_opts (void)
1385 /* Avoid allocating the deps buffer if we don't need it.
1386 (This flag may be true without there having been -MT or -MQ
1387 options, but we'll still need the deps buffer.) */
1391 deps = cpp_get_deps (parse_in);
1393 for (i = 0; i < deferred_count; i++)
1395 struct deferred_opt *opt = &deferred_opts[i];
1397 if (opt->code == OPT_MT || opt->code == OPT_MQ)
1398 deps_add_target (deps, opt->arg, opt->code == OPT_MQ);
1402 /* These settings are appropriate for GCC, but not necessarily so for
1403 cpplib as a library. */
1405 sanitize_cpp_opts (void)
1407 /* If we don't know what style of dependencies to output, complain
1408 if any other dependency switches have been given. */
1409 if (deps_seen && cpp_opts->deps.style == DEPS_NONE)
1410 error ("to generate dependencies you must specify either -M or -MM");
1412 /* -dM and dependencies suppress normal output; do it here so that
1413 the last -d[MDN] switch overrides earlier ones. */
1414 if (flag_dump_macros == 'M')
1417 /* By default, -fdirectives-only implies -dD. This allows subsequent phases
1418 to perform proper macro expansion. */
1419 if (cpp_opts->directives_only && !cpp_opts->preprocessed && !flag_dump_macros)
1420 flag_dump_macros = 'D';
1422 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1423 -dM since at least glibc relies on -M -dM to work. */
1424 /* Also, flag_no_output implies flag_no_line_commands, always. */
1427 if (flag_dump_macros != 'M')
1428 flag_dump_macros = 0;
1429 flag_dump_includes = 0;
1430 flag_no_line_commands = 1;
1432 else if (cpp_opts->deps.missing_files)
1433 error ("-MG may only be used with -M or -MM");
1435 cpp_opts->unsigned_char = !flag_signed_char;
1436 cpp_opts->stdc_0_in_system_headers = STDC_0_IN_SYSTEM_HEADERS;
1438 /* Wlong-long is disabled by default. It is enabled by:
1439 [-pedantic | -Wtraditional] -std=[gnu|c]++98 ; or
1440 [-pedantic | -Wtraditional] -std=non-c99 .
1442 Either -Wlong-long or -Wno-long-long override any other settings. */
1443 if (warn_long_long == -1)
1444 warn_long_long = ((pedantic || warn_traditional)
1445 && (c_dialect_cxx () ? cxx_dialect == cxx98 : !flag_isoc99));
1446 cpp_opts->warn_long_long = warn_long_long;
1448 /* Similarly with -Wno-variadic-macros. No check for c99 here, since
1449 this also turns off warnings about GCCs extension. */
1450 cpp_opts->warn_variadic_macros
1451 = warn_variadic_macros && (pedantic || warn_traditional);
1453 /* If we're generating preprocessor output, emit current directory
1454 if explicitly requested or if debugging information is enabled.
1455 ??? Maybe we should only do it for debugging formats that
1456 actually output the current directory? */
1457 if (flag_working_directory == -1)
1458 flag_working_directory = (debug_info_level != DINFO_LEVEL_NONE);
1460 if (cpp_opts->directives_only)
1462 if (warn_unused_macros)
1463 error ("-fdirectives-only is incompatible with -Wunused_macros");
1464 if (cpp_opts->traditional)
1465 error ("-fdirectives-only is incompatible with -traditional");
1469 /* Add include path with a prefix at the front of its name. */
1471 add_prefixed_path (const char *suffix, size_t chain)
1475 size_t prefix_len, suffix_len;
1477 suffix_len = strlen (suffix);
1478 prefix = iprefix ? iprefix : cpp_GCC_INCLUDE_DIR;
1479 prefix_len = iprefix ? strlen (iprefix) : cpp_GCC_INCLUDE_DIR_len;
1481 path = (char *) xmalloc (prefix_len + suffix_len + 1);
1482 memcpy (path, prefix, prefix_len);
1483 memcpy (path + prefix_len, suffix, suffix_len);
1484 path[prefix_len + suffix_len] = '\0';
1486 add_path (path, chain, 0, false);
1489 /* Handle -D, -U, -A, -imacros, and the first -include. */
1491 finish_options (void)
1493 if (!cpp_opts->preprocessed)
1497 cb_file_change (parse_in,
1498 linemap_add (line_table, LC_RENAME, 0,
1499 _("<built-in>"), 0));
1501 cpp_init_builtins (parse_in, flag_hosted);
1502 c_cpp_builtins (parse_in);
1504 /* We're about to send user input to cpplib, so make it warn for
1505 things that we previously (when we sent it internal definitions)
1506 told it to not warn.
1508 C99 permits implementation-defined characters in identifiers.
1509 The documented meaning of -std= is to turn off extensions that
1510 conflict with the specified standard, and since a strictly
1511 conforming program cannot contain a '$', we do not condition
1512 their acceptance on the -std= setting. */
1513 cpp_opts->warn_dollars = (cpp_opts->pedantic && !cpp_opts->c99);
1515 cb_file_change (parse_in,
1516 linemap_add (line_table, LC_RENAME, 0,
1517 _("<command-line>"), 0));
1519 for (i = 0; i < deferred_count; i++)
1521 struct deferred_opt *opt = &deferred_opts[i];
1523 if (opt->code == OPT_D)
1524 cpp_define (parse_in, opt->arg);
1525 else if (opt->code == OPT_U)
1526 cpp_undef (parse_in, opt->arg);
1527 else if (opt->code == OPT_A)
1529 if (opt->arg[0] == '-')
1530 cpp_unassert (parse_in, opt->arg + 1);
1532 cpp_assert (parse_in, opt->arg);
1536 /* Handle -imacros after -D and -U. */
1537 for (i = 0; i < deferred_count; i++)
1539 struct deferred_opt *opt = &deferred_opts[i];
1541 if (opt->code == OPT_imacros
1542 && cpp_push_include (parse_in, opt->arg))
1544 /* Disable push_command_line_include callback for now. */
1545 include_cursor = deferred_count + 1;
1546 cpp_scan_nooutput (parse_in);
1550 else if (cpp_opts->directives_only)
1551 cpp_init_special_builtins (parse_in);
1554 push_command_line_include ();
1557 /* Give CPP the next file given by -include, if any. */
1559 push_command_line_include (void)
1561 while (include_cursor < deferred_count)
1563 struct deferred_opt *opt = &deferred_opts[include_cursor++];
1565 if (!cpp_opts->preprocessed && opt->code == OPT_include
1566 && cpp_push_include (parse_in, opt->arg))
1570 if (include_cursor == deferred_count)
1573 /* -Wunused-macros should only warn about macros defined hereafter. */
1574 cpp_opts->warn_unused_macros = warn_unused_macros;
1575 /* Restore the line map from <command line>. */
1576 if (!cpp_opts->preprocessed)
1577 cpp_change_file (parse_in, LC_RENAME, this_input_filename);
1579 /* Set this here so the client can change the option if it wishes,
1580 and after stacking the main file so we don't trace the main file. */
1581 line_table->trace_includes = cpp_opts->print_include_names;
1585 /* File change callback. Has to handle -include files. */
1587 cb_file_change (cpp_reader * ARG_UNUSED (pfile),
1588 const struct line_map *new_map)
1590 if (flag_preprocess_only)
1591 pp_file_change (new_map);
1593 fe_file_change (new_map);
1595 if (new_map == 0 || (new_map->reason == LC_LEAVE && MAIN_FILE_P (new_map)))
1596 push_command_line_include ();
1600 cb_dir_change (cpp_reader * ARG_UNUSED (pfile), const char *dir)
1602 if (!set_src_pwd (dir))
1603 warning (0, "too late for # directive to set debug directory");
1606 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1607 extensions if ISO). There is no concept of gnu94. */
1609 set_std_c89 (int c94, int iso)
1611 cpp_set_lang (parse_in, c94 ? CLK_STDC94: iso ? CLK_STDC89: CLK_GNUC89);
1614 flag_no_gnu_keywords = iso;
1615 flag_no_nonansi_builtin = iso;
1620 /* Set the C 99 standard (without GNU extensions if ISO). */
1622 set_std_c99 (int iso)
1624 cpp_set_lang (parse_in, iso ? CLK_STDC99: CLK_GNUC99);
1626 flag_no_nonansi_builtin = iso;
1632 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1634 set_std_cxx98 (int iso)
1636 cpp_set_lang (parse_in, iso ? CLK_CXX98: CLK_GNUCXX);
1637 flag_no_gnu_keywords = iso;
1638 flag_no_nonansi_builtin = iso;
1640 cxx_dialect = cxx98;
1643 /* Set the C++ 0x working draft "standard" (without GNU extensions if ISO). */
1645 set_std_cxx0x (int iso)
1647 cpp_set_lang (parse_in, iso ? CLK_CXX0X: CLK_GNUCXX0X);
1648 flag_no_gnu_keywords = iso;
1649 flag_no_nonansi_builtin = iso;
1651 cxx_dialect = cxx0x;
1654 /* Handle setting implicit to ON. */
1656 set_Wimplicit (int on)
1659 warn_implicit_int = on;
1660 warn_implicit_function_declaration = on;
1663 /* Args to -d specify what to dump. Silently ignore
1664 unrecognized options; they may be aimed at toplev.c. */
1666 handle_OPT_d (const char *arg)
1670 while ((c = *arg++) != '\0')
1673 case 'M': /* Dump macros only. */
1674 case 'N': /* Dump names. */
1675 case 'D': /* Dump definitions. */
1676 case 'U': /* Dump used macros. */
1677 flag_dump_macros = c;
1681 flag_dump_includes = 1;