1 /* C/ObjC/C++ command line option handling.
2 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
3 Free Software Foundation, Inc.
4 Contributed by Neil Booth.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
24 #include "coretypes.h"
30 #include "langhooks.h"
31 #include "diagnostic.h"
33 #include "cppdefault.h"
35 #include "debug.h" /* For debug_hooks. */
39 #include "target.h" /* For gcc_targetcm. */
40 #include "tm_p.h" /* For C_COMMON_OVERRIDE_OPTIONS. */
42 #ifndef DOLLARS_IN_IDENTIFIERS
43 # define DOLLARS_IN_IDENTIFIERS true
46 #ifndef TARGET_SYSTEM_ROOT
47 # define TARGET_SYSTEM_ROOT NULL
51 #define TARGET_OPTF(ARG)
55 cpp_options *cpp_opts;
58 static const char *this_input_filename;
60 /* Filename and stream for preprocessed output. */
61 static const char *out_fname;
62 static FILE *out_stream;
64 /* Append dependencies to deps_file. */
65 static bool deps_append;
67 /* If dependency switches (-MF etc.) have been given. */
68 static bool deps_seen;
73 /* Dependency output file. */
74 static const char *deps_file;
76 /* The prefix given by -iprefix, if any. */
77 static const char *iprefix;
79 /* The multilib directory given by -imultilib, if any. */
80 static const char *imultilib;
82 /* The system root, if any. Overridden by -isysroot. */
83 static const char *sysroot = TARGET_SYSTEM_ROOT;
85 /* Zero disables all standard directories for headers. */
86 static bool std_inc = true;
88 /* Zero disables the C++-specific standard directories for headers. */
89 static bool std_cxx_inc = true;
91 /* If the quote chain has been split by -I-. */
92 static bool quote_chain_split;
94 /* If -Wunused-macros. */
95 static bool warn_unused_macros;
97 /* If -Wvariadic-macros. */
98 static bool warn_variadic_macros = true;
100 /* Number of deferred options. */
101 static size_t deferred_count;
103 /* Number of deferred options scanned for -include. */
104 static size_t include_cursor;
106 static void handle_OPT_d (const char *);
107 static void set_std_cxx98 (int);
108 static void set_std_cxx0x (int);
109 static void set_std_c89 (int, int);
110 static void set_std_c99 (int);
111 static void set_std_c1x (int);
112 static void check_deps_environment_vars (void);
113 static void handle_deferred_opts (void);
114 static void sanitize_cpp_opts (void);
115 static void add_prefixed_path (const char *, size_t);
116 static void push_command_line_include (void);
117 static void cb_file_change (cpp_reader *, const struct line_map *);
118 static void cb_dir_change (cpp_reader *, const char *);
119 static void finish_options (void);
121 #ifndef STDC_0_IN_SYSTEM_HEADERS
122 #define STDC_0_IN_SYSTEM_HEADERS 0
125 /* Holds switches parsed by c_common_handle_option (), but whose
126 handling is deferred to c_common_post_options (). */
127 static void defer_opt (enum opt_code, const char *);
128 static struct deferred_opt
135 static const unsigned int
136 c_family_lang_mask = (CL_C | CL_CXX | CL_ObjC | CL_ObjCXX);
138 /* Defer option CODE with argument ARG. */
140 defer_opt (enum opt_code code, const char *arg)
142 deferred_opts[deferred_count].code = code;
143 deferred_opts[deferred_count].arg = arg;
147 /* -Werror= may set a warning option to enable a warning that is emitted
148 by the preprocessor. Set any corresponding flag in cpp_opts. */
151 warning_as_error_callback (int option_index)
153 switch (option_index)
156 /* Ignore options not associated with the preprocessor. */
159 case OPT_Wdeprecated:
160 cpp_opts->warn_deprecated = 1;
165 cpp_opts->warn_comments = 1;
169 cpp_opts->warn_trigraphs = 1;
173 cpp_opts->warn_multichar = 1;
176 case OPT_Wtraditional:
177 cpp_opts->warn_traditional = 1;
181 cpp_opts->warn_long_long = 1;
184 case OPT_Wendif_labels:
185 cpp_opts->warn_endif_labels = 1;
188 case OPT_Wvariadic_macros:
189 /* Set the local flag that is used later to update cpp_opts. */
190 warn_variadic_macros = 1;
193 case OPT_Wbuiltin_macro_redefined:
194 cpp_opts->warn_builtin_macro_redefined = 1;
198 cpp_opts->warn_undef = 1;
201 case OPT_Wunused_macros:
202 /* Set the local flag that is used later to update cpp_opts. */
203 warn_unused_macros = 1;
206 case OPT_Wc___compat:
207 /* Add warnings in the same way as c_common_handle_option below. */
208 if (warn_enum_compare == -1)
209 warn_enum_compare = 1;
210 if (warn_jump_misses_init == -1)
211 warn_jump_misses_init = 1;
212 cpp_opts->warn_cxx_operator_names = 1;
215 case OPT_Wnormalized_:
216 inform (input_location, "-Werror=normalized=: Set -Wnormalized=nfc");
217 cpp_opts->warn_normalize = normalized_C;
220 case OPT_Winvalid_pch:
221 cpp_opts->warn_invalid_pch = 1;
225 /* Handled by standard diagnostics using the option's associated
231 /* Return language mask for option parsing. */
233 c_common_option_lang_mask (void)
235 static const unsigned int lang_flags[] = {CL_C, CL_ObjC, CL_CXX, CL_ObjCXX};
237 return lang_flags[c_language];
240 /* Common diagnostics initialization. */
242 c_common_initialize_diagnostics (diagnostic_context *context)
244 /* Register callback for warnings enabled by -Werror=. */
245 register_warning_as_error_callback (warning_as_error_callback);
247 /* This is conditionalized only because that is the way the front
248 ends used to do it. Maybe this should be unconditional? */
249 if (c_dialect_cxx ())
251 /* By default wrap lines at 80 characters. Is getenv
252 ("COLUMNS") preferable? */
253 diagnostic_line_cutoff (context) = 80;
254 /* By default, emit location information once for every
255 diagnostic message. */
256 diagnostic_prefixing_rule (context) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
259 context->opt_permissive = OPT_fpermissive;
262 /* Whether options from all C-family languages should be accepted
264 static bool accept_all_c_family_options = false;
266 /* Return whether to complain about a wrong-language option. */
268 c_common_complain_wrong_lang_p (const struct cl_option *option)
270 if (accept_all_c_family_options
271 && (option->flags & c_family_lang_mask))
277 /* Common initialization before calling option handlers. */
279 c_common_init_options (unsigned int decoded_options_count,
280 struct cl_decoded_option *decoded_options)
283 struct cpp_callbacks *cb;
285 parse_in = cpp_create_reader (c_dialect_cxx () ? CLK_GNUCXX: CLK_GNUC89,
286 ident_hash, line_table);
287 cb = cpp_get_callbacks (parse_in);
288 cb->error = c_cpp_error;
290 cpp_opts = cpp_get_options (parse_in);
291 cpp_opts->dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
292 cpp_opts->objc = c_dialect_objc ();
294 /* Reset to avoid warnings on internal definitions. We set it just
295 before passing on command-line options to cpplib. */
296 cpp_opts->warn_dollars = 0;
298 flag_exceptions = c_dialect_cxx ();
299 warn_pointer_arith = c_dialect_cxx ();
300 warn_write_strings = c_dialect_cxx();
301 flag_warn_unused_result = true;
303 /* By default, C99-like requirements for complex multiply and divide. */
304 flag_complex_method = 2;
306 deferred_opts = XNEWVEC (struct deferred_opt, decoded_options_count);
308 if (c_language == clk_c)
310 /* If preprocessing assembly language, accept any of the C-family
311 front end options since the driver may pass them through. */
312 for (i = 1; i < decoded_options_count; i++)
313 if (decoded_options[i].opt_index == OPT_lang_asm)
315 accept_all_c_family_options = true;
321 /* Handle switch SCODE with argument ARG. VALUE is true, unless no-
322 form of an -f or -W option was given. Returns false if the switch was
323 invalid, true if valid. Use HANDLERS in recursive handle_option calls. */
325 c_common_handle_option (size_t scode, const char *arg, int value,
326 int kind, const struct cl_option_handlers *handlers)
328 const struct cl_option *option = &cl_options[scode];
329 enum opt_code code = (enum opt_code) scode;
332 /* Prevent resetting the language standard to a C dialect when the driver
333 has already determined that we're looking at assembler input. */
334 bool preprocessing_asm_p = (cpp_get_options (parse_in)->lang == CLK_ASM);
339 if (cl_options[code].flags & c_family_lang_mask)
341 if ((option->flags & CL_TARGET)
342 && ! targetcm.handle_c_option (scode, arg, value))
349 case OPT__output_pch_:
354 defer_opt (code, arg);
358 cpp_opts->discard_comments = 0;
362 cpp_opts->discard_comments = 0;
363 cpp_opts->discard_comments_in_macro_exp = 0;
367 defer_opt (code, arg);
371 cpp_opts->print_include_names = 1;
375 TARGET_OPTF (xstrdup (arg));
379 if (strcmp (arg, "-"))
380 add_path (xstrdup (arg), BRACKET, 0, true);
383 if (quote_chain_split)
384 error ("-I- specified twice");
385 quote_chain_split = true;
386 split_quote_chain ();
387 inform (input_location, "obsolete option -I- used, please use -iquote instead");
393 /* When doing dependencies with -M or -MM, suppress normal
394 preprocessed output, but still do -dM etc. as software
395 depends on this. Preprocessed output does occur if -MD, -MMD
396 or environment var dependency generation is used. */
397 cpp_opts->deps.style = (code == OPT_M ? DEPS_SYSTEM: DEPS_USER);
403 cpp_opts->deps.style = (code == OPT_MD ? DEPS_SYSTEM: DEPS_USER);
404 cpp_opts->deps.need_preprocessor_output = true;
415 cpp_opts->deps.missing_files = true;
420 cpp_opts->deps.phony_targets = true;
426 defer_opt (code, arg);
430 flag_no_line_commands = 1;
434 defer_opt (code, arg);
440 handle_option (OPT_Wimplicit, NULL, value, c_family_lang_mask, kind,
442 warn_char_subscripts = value;
443 warn_missing_braces = value;
444 warn_parentheses = value;
445 warn_return_type = value;
446 warn_sequence_point = value; /* Was C only. */
448 if (warn_strict_aliasing == -1)
449 set_Wstrict_aliasing (value);
450 warn_address = value;
451 if (warn_strict_overflow == -1)
452 warn_strict_overflow = value;
453 warn_array_bounds = value;
454 warn_volatile_register_var = value;
456 /* Only warn about unknown pragmas that are not in system
458 warn_unknown_pragmas = value;
460 warn_uninitialized = value;
462 if (!c_dialect_cxx ())
464 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding
465 can turn it off only if it's not explicit. */
467 warn_main = (value ? 2 : 0);
469 /* In C, -Wall turns on -Wenum-compare, which we do here.
470 In C++ it is on by default, which is done in
471 c_common_post_options. */
472 if (warn_enum_compare == -1)
473 warn_enum_compare = value;
477 /* C++-specific warnings. */
478 warn_sign_compare = value;
479 warn_reorder = value;
480 warn_cxx0x_compat = value;
483 cpp_opts->warn_trigraphs = value;
484 cpp_opts->warn_comments = value;
485 cpp_opts->warn_num_sign_change = value;
487 if (warn_pointer_sign == -1)
488 warn_pointer_sign = value;
491 case OPT_Wbuiltin_macro_redefined:
492 cpp_opts->warn_builtin_macro_redefined = value;
497 cpp_opts->warn_comments = value;
500 case OPT_Wc___compat:
501 /* Because -Wenum-compare is the default in C++, -Wc++-compat
502 implies -Wenum-compare. */
503 if (warn_enum_compare == -1 && value)
504 warn_enum_compare = value;
505 /* Because C++ always warns about a goto which misses an
506 initialization, -Wc++-compat turns on -Wjump-misses-init. */
507 if (warn_jump_misses_init == -1 && value)
508 warn_jump_misses_init = value;
509 cpp_opts->warn_cxx_operator_names = value;
512 case OPT_Wdeprecated:
513 cpp_opts->warn_deprecated = value;
516 case OPT_Wendif_labels:
517 cpp_opts->warn_endif_labels = value;
521 global_dc->warning_as_error_requested = value;
524 case OPT_Werror_implicit_function_declaration:
525 /* For backward compatibility, this is the same as
526 -Werror=implicit-function-declaration. */
527 enable_warning_as_error ("implicit-function-declaration", value,
528 CL_C | CL_ObjC, handlers);
536 set_Wformat (atoi (arg));
540 gcc_assert (value == 0 || value == 1);
541 if (warn_implicit_int == -1)
542 handle_option (OPT_Wimplicit_int, NULL, value,
543 c_family_lang_mask, kind, handlers);
544 if (warn_implicit_function_declaration == -1)
545 handle_option (OPT_Wimplicit_function_declaration, NULL, value,
546 c_family_lang_mask, kind, handlers);
550 /* Silently ignore for now. */
553 case OPT_Winvalid_pch:
554 cpp_opts->warn_invalid_pch = value;
557 case OPT_Wmissing_include_dirs:
558 cpp_opts->warn_missing_include_dirs = value;
562 cpp_opts->warn_multichar = value;
565 case OPT_Wnormalized_:
566 if (!value || (arg && strcasecmp (arg, "none") == 0))
567 cpp_opts->warn_normalize = normalized_none;
568 else if (!arg || strcasecmp (arg, "nfkc") == 0)
569 cpp_opts->warn_normalize = normalized_KC;
570 else if (strcasecmp (arg, "id") == 0)
571 cpp_opts->warn_normalize = normalized_identifier_C;
572 else if (strcasecmp (arg, "nfc") == 0)
573 cpp_opts->warn_normalize = normalized_C;
575 error ("argument %qs to %<-Wnormalized%> not recognized", arg);
578 case OPT_Wreturn_type:
579 warn_return_type = value;
582 case OPT_Wtraditional:
583 cpp_opts->warn_traditional = value;
587 cpp_opts->warn_trigraphs = value;
591 cpp_opts->warn_undef = value;
594 case OPT_Wunknown_pragmas:
595 /* Set to greater than 1, so that even unknown pragmas in
596 system headers will be warned about. */
597 warn_unknown_pragmas = value * 2;
600 case OPT_Wunused_macros:
601 warn_unused_macros = value;
604 case OPT_Wvariadic_macros:
605 warn_variadic_macros = value;
608 case OPT_Wwrite_strings:
609 warn_write_strings = value;
615 warn_nonvdtor = true;
619 if (!c_dialect_cxx ())
620 set_std_c89 (false, true);
622 set_std_cxx98 (true);
629 case OPT_fcond_mismatch:
630 if (!c_dialect_cxx ())
632 flag_cond_mismatch = value;
637 case OPT_fall_virtual:
638 case OPT_falt_external_templates:
639 case OPT_fenum_int_equiv:
640 case OPT_fexternal_templates:
641 case OPT_fguiding_decls:
643 case OPT_fhuge_objects:
645 case OPT_fname_mangling_version_:
647 case OPT_fnonnull_objects:
649 case OPT_fstrict_prototype:
650 case OPT_fthis_is_variable:
651 case OPT_fvtable_thunks:
654 warning (0, "switch %qs is no longer supported", option->opt_text);
661 disable_builtin_function (arg);
664 case OPT_fdirectives_only:
665 cpp_opts->directives_only = value;
668 case OPT_fdollars_in_identifiers:
669 cpp_opts->dollars_in_ident = value;
672 case OPT_ffreestanding:
674 /* Fall through.... */
677 flag_no_builtin = !value;
680 case OPT_fconstant_string_class_:
681 constant_string_class_name = arg;
684 case OPT_fdefault_inline:
688 case OPT_fextended_identifiers:
689 cpp_opts->extended_identifiers = value;
692 case OPT_fgnu_runtime:
693 flag_next_runtime = !value;
696 case OPT_fhandle_exceptions:
697 warning (0, "-fhandle-exceptions has been renamed -fexceptions (and is now on by default)");
698 flag_exceptions = value;
701 case OPT_fnext_runtime:
702 flag_next_runtime = value;
705 case OPT_foperator_names:
706 cpp_opts->operator_names = value;
709 case OPT_foptional_diags:
714 cpp_opts->restore_pch_deps = value;
717 case OPT_fpch_preprocess:
718 flag_pch_preprocess = value;
721 case OPT_fpermissive:
722 flag_permissive = value;
723 global_dc->permissive = value;
726 case OPT_fpreprocessed:
727 cpp_opts->preprocessed = value;
731 flag_use_repository = value;
733 flag_implicit_templates = 0;
737 /* It is documented that we silently ignore silly values. */
738 if (value >= 1 && value <= 100)
739 cpp_opts->tabstop = value;
742 case OPT_fexec_charset_:
743 cpp_opts->narrow_charset = arg;
746 case OPT_fwide_exec_charset_:
747 cpp_opts->wide_charset = arg;
750 case OPT_finput_charset_:
751 cpp_opts->input_charset = arg;
754 case OPT_ftemplate_depth_:
755 /* Kept for backwards compatibility. */
756 case OPT_ftemplate_depth_eq:
757 max_tinst_depth = value;
760 case OPT_fvisibility_inlines_hidden:
761 visibility_options.inlines_hidden = value;
764 case OPT_femit_struct_debug_baseonly:
765 set_struct_debug_option ("base");
768 case OPT_femit_struct_debug_reduced:
769 set_struct_debug_option ("dir:ord:sys,dir:gen:any,ind:base");
772 case OPT_femit_struct_debug_detailed_:
773 set_struct_debug_option (arg);
777 add_path (xstrdup (arg), AFTER, 0, true);
782 defer_opt (code, arg);
794 add_path (xstrdup (arg), QUOTE, 0, true);
802 add_path (xstrdup (arg), SYSTEM, 0, true);
805 case OPT_iwithprefix:
806 add_prefixed_path (arg, SYSTEM);
809 case OPT_iwithprefixbefore:
810 add_prefixed_path (arg, BRACKET);
814 cpp_set_lang (parse_in, CLK_ASM);
815 cpp_opts->dollars_in_ident = false;
830 error ("output filename specified twice");
833 /* We need to handle the -pedantic switches here, rather than in
834 c_common_post_options, so that a subsequent -Wno-endif-labels
835 is not overridden. */
836 case OPT_pedantic_errors:
838 cpp_opts->pedantic = 1;
839 cpp_opts->warn_endif_labels = 1;
840 if (warn_pointer_sign == -1)
841 warn_pointer_sign = 1;
842 if (warn_overlength_strings == -1)
843 warn_overlength_strings = 1;
848 case OPT_print_objc_runtime_info:
849 print_struct_values = 1;
857 case OPT_std_gnu__98:
858 if (!preprocessing_asm_p)
859 set_std_cxx98 (code == OPT_std_c__98 /* ISO */);
863 case OPT_std_gnu__0x:
864 if (!preprocessing_asm_p)
865 set_std_cxx0x (code == OPT_std_c__0x /* ISO */);
870 case OPT_std_iso9899_1990:
871 case OPT_std_iso9899_199409:
872 if (!preprocessing_asm_p)
873 set_std_c89 (code == OPT_std_iso9899_199409 /* c94 */, true /* ISO */);
878 if (!preprocessing_asm_p)
879 set_std_c89 (false /* c94 */, false /* ISO */);
884 case OPT_std_iso9899_1999:
885 case OPT_std_iso9899_199x:
886 if (!preprocessing_asm_p)
887 set_std_c99 (true /* ISO */);
892 if (!preprocessing_asm_p)
893 set_std_c99 (false /* ISO */);
897 if (!preprocessing_asm_p)
898 set_std_c1x (true /* ISO */);
902 if (!preprocessing_asm_p)
903 set_std_c1x (false /* ISO */);
907 cpp_opts->trigraphs = 1;
910 case OPT_traditional_cpp:
911 cpp_opts->traditional = 1;
926 /* Post-switch processing. */
928 c_common_post_options (const char **pfilename)
930 struct cpp_callbacks *cb;
932 /* Canonicalize the input and output filenames. */
933 if (in_fnames == NULL)
935 in_fnames = XNEWVEC (const char *, 1);
938 else if (strcmp (in_fnames[0], "-") == 0)
941 if (out_fname == NULL || !strcmp (out_fname, "-"))
944 if (cpp_opts->deps.style == DEPS_NONE)
945 check_deps_environment_vars ();
947 handle_deferred_opts ();
949 sanitize_cpp_opts ();
951 register_include_chains (parse_in, sysroot, iprefix, imultilib,
952 std_inc, std_cxx_inc && c_dialect_cxx (), verbose);
954 #ifdef C_COMMON_OVERRIDE_OPTIONS
955 /* Some machines may reject certain combinations of C
956 language-specific options. */
957 C_COMMON_OVERRIDE_OPTIONS;
960 /* Excess precision other than "fast" requires front-end
962 if (c_dialect_cxx ())
964 if (flag_excess_precision_cmdline == EXCESS_PRECISION_STANDARD
965 && TARGET_FLT_EVAL_METHOD_NON_DEFAULT)
966 sorry ("-fexcess-precision=standard for C++");
967 flag_excess_precision_cmdline = EXCESS_PRECISION_FAST;
969 else if (flag_excess_precision_cmdline == EXCESS_PRECISION_DEFAULT)
970 flag_excess_precision_cmdline = (flag_iso
971 ? EXCESS_PRECISION_STANDARD
972 : EXCESS_PRECISION_FAST);
974 /* By default we use C99 inline semantics in GNU99 or C99 mode. C99
975 inline semantics are not supported in GNU89 or C89 mode. */
976 if (flag_gnu89_inline == -1)
977 flag_gnu89_inline = !flag_isoc99;
978 else if (!flag_gnu89_inline && !flag_isoc99)
979 error ("-fno-gnu89-inline is only supported in GNU99 or C99 mode");
981 /* Default to ObjC sjlj exception handling if NeXT runtime. */
982 if (flag_objc_sjlj_exceptions < 0)
983 flag_objc_sjlj_exceptions = flag_next_runtime;
984 if (flag_objc_exceptions && !flag_objc_sjlj_exceptions)
987 /* -Wextra implies the following flags
988 unless explicitly overridden. */
989 if (warn_type_limits == -1)
990 warn_type_limits = extra_warnings;
991 if (warn_clobbered == -1)
992 warn_clobbered = extra_warnings;
993 if (warn_empty_body == -1)
994 warn_empty_body = extra_warnings;
995 if (warn_sign_compare == -1)
996 warn_sign_compare = extra_warnings;
997 if (warn_missing_field_initializers == -1)
998 warn_missing_field_initializers = extra_warnings;
999 if (warn_missing_parameter_type == -1)
1000 warn_missing_parameter_type = extra_warnings;
1001 if (warn_old_style_declaration == -1)
1002 warn_old_style_declaration = extra_warnings;
1003 if (warn_override_init == -1)
1004 warn_override_init = extra_warnings;
1005 if (warn_ignored_qualifiers == -1)
1006 warn_ignored_qualifiers = extra_warnings;
1008 /* -Wpointer-sign is disabled by default, but it is enabled if any
1009 of -Wall or -pedantic are given. */
1010 if (warn_pointer_sign == -1)
1011 warn_pointer_sign = 0;
1013 if (warn_strict_aliasing == -1)
1014 warn_strict_aliasing = 0;
1015 if (warn_strict_overflow == -1)
1016 warn_strict_overflow = 0;
1017 if (warn_jump_misses_init == -1)
1018 warn_jump_misses_init = 0;
1020 /* -Woverlength-strings is off by default, but is enabled by -pedantic.
1021 It is never enabled in C++, as the minimum limit is not normative
1022 in that standard. */
1023 if (warn_overlength_strings == -1 || c_dialect_cxx ())
1024 warn_overlength_strings = 0;
1026 /* Wmain is enabled by default in C++ but not in C. */
1027 /* Wmain is disabled by default for -ffreestanding (!flag_hosted),
1028 even if -Wall was given (warn_main will be 2 if set by -Wall, 1
1029 if set by -Wmain). */
1030 if (warn_main == -1)
1031 warn_main = (c_dialect_cxx () && flag_hosted) ? 1 : 0;
1032 else if (warn_main == 2)
1033 warn_main = flag_hosted ? 1 : 0;
1035 /* In C, -Wconversion enables -Wsign-conversion (unless disabled
1036 through -Wno-sign-conversion). While in C++,
1037 -Wsign-conversion needs to be requested explicitly. */
1038 if (warn_sign_conversion == -1)
1039 warn_sign_conversion = (c_dialect_cxx ()) ? 0 : warn_conversion;
1041 /* In C, -Wall and -Wc++-compat enable -Wenum-compare, which we do
1042 in c_common_handle_option; if it has not yet been set, it is
1043 disabled by default. In C++, it is enabled by default. */
1044 if (warn_enum_compare == -1)
1045 warn_enum_compare = c_dialect_cxx () ? 1 : 0;
1047 /* -Wpacked-bitfield-compat is on by default for the C languages. The
1048 warning is issued in stor-layout.c which is not part of the front-end so
1049 we need to selectively turn it on here. */
1050 if (warn_packed_bitfield_compat == -1)
1051 warn_packed_bitfield_compat = 1;
1053 /* Special format checking options don't work without -Wformat; warn if
1057 warning (OPT_Wformat_y2k,
1058 "-Wformat-y2k ignored without -Wformat");
1059 warning (OPT_Wformat_extra_args,
1060 "-Wformat-extra-args ignored without -Wformat");
1061 warning (OPT_Wformat_zero_length,
1062 "-Wformat-zero-length ignored without -Wformat");
1063 warning (OPT_Wformat_nonliteral,
1064 "-Wformat-nonliteral ignored without -Wformat");
1065 warning (OPT_Wformat_contains_nul,
1066 "-Wformat-contains-nul ignored without -Wformat");
1067 warning (OPT_Wformat_security,
1068 "-Wformat-security ignored without -Wformat");
1071 if (warn_implicit == -1)
1074 if (warn_implicit_int == -1)
1075 warn_implicit_int = 0;
1077 /* -Wimplicit-function-declaration is enabled by default for C99. */
1078 if (warn_implicit_function_declaration == -1)
1079 warn_implicit_function_declaration = flag_isoc99;
1081 /* If we're allowing C++0x constructs, don't warn about C++0x
1082 compatibility problems. */
1083 if (cxx_dialect == cxx0x)
1084 warn_cxx0x_compat = 0;
1086 if (flag_preprocess_only)
1088 /* Open the output now. We must do so even if flag_no_output is
1089 on, because there may be other output than from the actual
1090 preprocessing (e.g. from -dM). */
1091 if (out_fname[0] == '\0')
1092 out_stream = stdout;
1094 out_stream = fopen (out_fname, "w");
1096 if (out_stream == NULL)
1098 fatal_error ("opening output file %s: %m", out_fname);
1102 if (num_in_fnames > 1)
1103 error ("too many filenames given. Type %s --help for usage",
1106 init_pp_output (out_stream);
1112 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1113 input_location = UNKNOWN_LOCATION;
1116 cb = cpp_get_callbacks (parse_in);
1117 cb->file_change = cb_file_change;
1118 cb->dir_change = cb_dir_change;
1119 cpp_post_options (parse_in);
1121 input_location = UNKNOWN_LOCATION;
1123 *pfilename = this_input_filename
1124 = cpp_read_main_file (parse_in, in_fnames[0]);
1125 /* Don't do any compilation or preprocessing if there is no input file. */
1126 if (this_input_filename == NULL)
1132 if (flag_working_directory
1133 && flag_preprocess_only && !flag_no_line_commands)
1134 pp_dir_change (parse_in, get_src_pwd ());
1136 return flag_preprocess_only;
1139 /* Front end initialization common to C, ObjC and C++. */
1141 c_common_init (void)
1143 /* Set up preprocessor arithmetic. Must be done after call to
1144 c_common_nodes_and_builtins for type nodes to be good. */
1145 cpp_opts->precision = TYPE_PRECISION (intmax_type_node);
1146 cpp_opts->char_precision = TYPE_PRECISION (char_type_node);
1147 cpp_opts->int_precision = TYPE_PRECISION (integer_type_node);
1148 cpp_opts->wchar_precision = TYPE_PRECISION (wchar_type_node);
1149 cpp_opts->unsigned_wchar = TYPE_UNSIGNED (wchar_type_node);
1150 cpp_opts->bytes_big_endian = BYTES_BIG_ENDIAN;
1152 /* This can't happen until after wchar_precision and bytes_big_endian
1154 cpp_init_iconv (parse_in);
1157 c_common_print_pch_checksum (stderr);
1159 /* Has to wait until now so that cpplib has its hash table. */
1162 if (flag_preprocess_only)
1165 preprocess_file (parse_in);
1172 /* Initialize the integrated preprocessor after debug output has been
1173 initialized; loop over each input file. */
1175 c_common_parse_file (int set_yydebug)
1183 warning(0, "The C parser does not support -dy, option ignored");
1187 "The Objective-C parser does not support -dy, option ignored");
1190 warning(0, "The C++ parser does not support -dy, option ignored");
1194 "The Objective-C++ parser does not support -dy, option ignored");
1209 /* And end the main input file, if the debug writer wants it */
1210 if (debug_hooks->start_end_main_source_file)
1211 (*debug_hooks->end_source_file) (0);
1212 if (++i >= num_in_fnames)
1214 cpp_undef_all (parse_in);
1215 cpp_clear_file_cache (parse_in);
1217 = cpp_read_main_file (parse_in, in_fnames[i]);
1218 /* If an input file is missing, abandon further compilation.
1219 cpplib has issued a diagnostic. */
1220 if (!this_input_filename)
1225 /* Common finish hook for the C, ObjC and C++ front ends. */
1227 c_common_finish (void)
1229 FILE *deps_stream = NULL;
1231 /* Don't write the deps file if there are errors. */
1232 if (cpp_opts->deps.style != DEPS_NONE && !seen_error ())
1234 /* If -M or -MM was seen without -MF, default output to the
1237 deps_stream = out_stream;
1240 deps_stream = fopen (deps_file, deps_append ? "a": "w");
1242 fatal_error ("opening dependency file %s: %m", deps_file);
1246 /* For performance, avoid tearing down cpplib's internal structures
1247 with cpp_destroy (). */
1248 cpp_finish (parse_in, deps_stream);
1250 if (deps_stream && deps_stream != out_stream
1251 && (ferror (deps_stream) || fclose (deps_stream)))
1252 fatal_error ("closing dependency file %s: %m", deps_file);
1254 if (out_stream && (ferror (out_stream) || fclose (out_stream)))
1255 fatal_error ("when writing output to %s: %m", out_fname);
1258 /* Either of two environment variables can specify output of
1259 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1260 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1261 and DEPS_TARGET is the target to mention in the deps. They also
1262 result in dependency information being appended to the output file
1263 rather than overwriting it, and like Sun's compiler
1264 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1266 check_deps_environment_vars (void)
1270 GET_ENVIRONMENT (spec, "DEPENDENCIES_OUTPUT");
1272 cpp_opts->deps.style = DEPS_USER;
1275 GET_ENVIRONMENT (spec, "SUNPRO_DEPENDENCIES");
1278 cpp_opts->deps.style = DEPS_SYSTEM;
1279 cpp_opts->deps.ignore_main_file = true;
1285 /* Find the space before the DEPS_TARGET, if there is one. */
1286 char *s = strchr (spec, ' ');
1289 /* Let the caller perform MAKE quoting. */
1290 defer_opt (OPT_MT, s + 1);
1294 /* Command line -MF overrides environment variables and default. */
1303 /* Handle deferred command line switches. */
1305 handle_deferred_opts (void)
1310 /* Avoid allocating the deps buffer if we don't need it.
1311 (This flag may be true without there having been -MT or -MQ
1312 options, but we'll still need the deps buffer.) */
1316 deps = cpp_get_deps (parse_in);
1318 for (i = 0; i < deferred_count; i++)
1320 struct deferred_opt *opt = &deferred_opts[i];
1322 if (opt->code == OPT_MT || opt->code == OPT_MQ)
1323 deps_add_target (deps, opt->arg, opt->code == OPT_MQ);
1327 /* These settings are appropriate for GCC, but not necessarily so for
1328 cpplib as a library. */
1330 sanitize_cpp_opts (void)
1332 /* If we don't know what style of dependencies to output, complain
1333 if any other dependency switches have been given. */
1334 if (deps_seen && cpp_opts->deps.style == DEPS_NONE)
1335 error ("to generate dependencies you must specify either -M or -MM");
1337 /* -dM and dependencies suppress normal output; do it here so that
1338 the last -d[MDN] switch overrides earlier ones. */
1339 if (flag_dump_macros == 'M')
1342 /* By default, -fdirectives-only implies -dD. This allows subsequent phases
1343 to perform proper macro expansion. */
1344 if (cpp_opts->directives_only && !cpp_opts->preprocessed && !flag_dump_macros)
1345 flag_dump_macros = 'D';
1347 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1348 -dM since at least glibc relies on -M -dM to work. */
1349 /* Also, flag_no_output implies flag_no_line_commands, always. */
1352 if (flag_dump_macros != 'M')
1353 flag_dump_macros = 0;
1354 flag_dump_includes = 0;
1355 flag_no_line_commands = 1;
1357 else if (cpp_opts->deps.missing_files)
1358 error ("-MG may only be used with -M or -MM");
1360 cpp_opts->unsigned_char = !flag_signed_char;
1361 cpp_opts->stdc_0_in_system_headers = STDC_0_IN_SYSTEM_HEADERS;
1363 /* Wlong-long is disabled by default. It is enabled by:
1364 [-pedantic | -Wtraditional] -std=[gnu|c]++98 ; or
1365 [-pedantic | -Wtraditional] -std=non-c99 .
1367 Either -Wlong-long or -Wno-long-long override any other settings. */
1368 if (warn_long_long == -1)
1369 warn_long_long = ((pedantic || warn_traditional)
1370 && (c_dialect_cxx () ? cxx_dialect == cxx98 : !flag_isoc99));
1371 cpp_opts->warn_long_long = warn_long_long;
1373 /* Similarly with -Wno-variadic-macros. No check for c99 here, since
1374 this also turns off warnings about GCCs extension. */
1375 cpp_opts->warn_variadic_macros
1376 = warn_variadic_macros && (pedantic || warn_traditional);
1378 /* If we're generating preprocessor output, emit current directory
1379 if explicitly requested or if debugging information is enabled.
1380 ??? Maybe we should only do it for debugging formats that
1381 actually output the current directory? */
1382 if (flag_working_directory == -1)
1383 flag_working_directory = (debug_info_level != DINFO_LEVEL_NONE);
1385 if (cpp_opts->directives_only)
1387 if (warn_unused_macros)
1388 error ("-fdirectives-only is incompatible with -Wunused_macros");
1389 if (cpp_opts->traditional)
1390 error ("-fdirectives-only is incompatible with -traditional");
1394 /* Add include path with a prefix at the front of its name. */
1396 add_prefixed_path (const char *suffix, size_t chain)
1400 size_t prefix_len, suffix_len;
1402 suffix_len = strlen (suffix);
1403 prefix = iprefix ? iprefix : cpp_GCC_INCLUDE_DIR;
1404 prefix_len = iprefix ? strlen (iprefix) : cpp_GCC_INCLUDE_DIR_len;
1406 path = (char *) xmalloc (prefix_len + suffix_len + 1);
1407 memcpy (path, prefix, prefix_len);
1408 memcpy (path + prefix_len, suffix, suffix_len);
1409 path[prefix_len + suffix_len] = '\0';
1411 add_path (path, chain, 0, false);
1414 /* Handle -D, -U, -A, -imacros, and the first -include. */
1416 finish_options (void)
1418 if (!cpp_opts->preprocessed)
1422 cb_file_change (parse_in,
1423 linemap_add (line_table, LC_RENAME, 0,
1424 _("<built-in>"), 0));
1426 cpp_init_builtins (parse_in, flag_hosted);
1427 c_cpp_builtins (parse_in);
1429 /* We're about to send user input to cpplib, so make it warn for
1430 things that we previously (when we sent it internal definitions)
1431 told it to not warn.
1433 C99 permits implementation-defined characters in identifiers.
1434 The documented meaning of -std= is to turn off extensions that
1435 conflict with the specified standard, and since a strictly
1436 conforming program cannot contain a '$', we do not condition
1437 their acceptance on the -std= setting. */
1438 cpp_opts->warn_dollars = (cpp_opts->pedantic && !cpp_opts->c99);
1440 cb_file_change (parse_in,
1441 linemap_add (line_table, LC_RENAME, 0,
1442 _("<command-line>"), 0));
1444 for (i = 0; i < deferred_count; i++)
1446 struct deferred_opt *opt = &deferred_opts[i];
1448 if (opt->code == OPT_D)
1449 cpp_define (parse_in, opt->arg);
1450 else if (opt->code == OPT_U)
1451 cpp_undef (parse_in, opt->arg);
1452 else if (opt->code == OPT_A)
1454 if (opt->arg[0] == '-')
1455 cpp_unassert (parse_in, opt->arg + 1);
1457 cpp_assert (parse_in, opt->arg);
1461 /* Start the main input file, if the debug writer wants it. */
1462 if (debug_hooks->start_end_main_source_file
1463 && !flag_preprocess_only)
1464 (*debug_hooks->start_source_file) (0, this_input_filename);
1466 /* Handle -imacros after -D and -U. */
1467 for (i = 0; i < deferred_count; i++)
1469 struct deferred_opt *opt = &deferred_opts[i];
1471 if (opt->code == OPT_imacros
1472 && cpp_push_include (parse_in, opt->arg))
1474 /* Disable push_command_line_include callback for now. */
1475 include_cursor = deferred_count + 1;
1476 cpp_scan_nooutput (parse_in);
1482 if (cpp_opts->directives_only)
1483 cpp_init_special_builtins (parse_in);
1485 /* Start the main input file, if the debug writer wants it. */
1486 if (debug_hooks->start_end_main_source_file
1487 && !flag_preprocess_only)
1488 (*debug_hooks->start_source_file) (0, this_input_filename);
1492 push_command_line_include ();
1495 /* Give CPP the next file given by -include, if any. */
1497 push_command_line_include (void)
1499 while (include_cursor < deferred_count)
1501 struct deferred_opt *opt = &deferred_opts[include_cursor++];
1503 if (!cpp_opts->preprocessed && opt->code == OPT_include
1504 && cpp_push_include (parse_in, opt->arg))
1508 if (include_cursor == deferred_count)
1511 /* -Wunused-macros should only warn about macros defined hereafter. */
1512 cpp_opts->warn_unused_macros = warn_unused_macros;
1513 /* Restore the line map from <command line>. */
1514 if (!cpp_opts->preprocessed)
1515 cpp_change_file (parse_in, LC_RENAME, this_input_filename);
1517 /* Set this here so the client can change the option if it wishes,
1518 and after stacking the main file so we don't trace the main file. */
1519 line_table->trace_includes = cpp_opts->print_include_names;
1523 /* File change callback. Has to handle -include files. */
1525 cb_file_change (cpp_reader * ARG_UNUSED (pfile),
1526 const struct line_map *new_map)
1528 if (flag_preprocess_only)
1529 pp_file_change (new_map);
1531 fe_file_change (new_map);
1533 if (new_map == 0 || (new_map->reason == LC_LEAVE && MAIN_FILE_P (new_map)))
1534 push_command_line_include ();
1538 cb_dir_change (cpp_reader * ARG_UNUSED (pfile), const char *dir)
1540 if (!set_src_pwd (dir))
1541 warning (0, "too late for # directive to set debug directory");
1544 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1545 extensions if ISO). There is no concept of gnu94. */
1547 set_std_c89 (int c94, int iso)
1549 cpp_set_lang (parse_in, c94 ? CLK_STDC94: iso ? CLK_STDC89: CLK_GNUC89);
1552 flag_no_gnu_keywords = iso;
1553 flag_no_nonansi_builtin = iso;
1559 /* Set the C 99 standard (without GNU extensions if ISO). */
1561 set_std_c99 (int iso)
1563 cpp_set_lang (parse_in, iso ? CLK_STDC99: CLK_GNUC99);
1565 flag_no_nonansi_builtin = iso;
1572 /* Set the C 1X standard draft (without GNU extensions if ISO). */
1574 set_std_c1x (int iso)
1576 cpp_set_lang (parse_in, iso ? CLK_STDC1X: CLK_GNUC1X);
1578 flag_no_nonansi_builtin = iso;
1585 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1587 set_std_cxx98 (int iso)
1589 cpp_set_lang (parse_in, iso ? CLK_CXX98: CLK_GNUCXX);
1590 flag_no_gnu_keywords = iso;
1591 flag_no_nonansi_builtin = iso;
1593 cxx_dialect = cxx98;
1596 /* Set the C++ 0x working draft "standard" (without GNU extensions if ISO). */
1598 set_std_cxx0x (int iso)
1600 cpp_set_lang (parse_in, iso ? CLK_CXX0X: CLK_GNUCXX0X);
1601 flag_no_gnu_keywords = iso;
1602 flag_no_nonansi_builtin = iso;
1604 cxx_dialect = cxx0x;
1607 /* Args to -d specify what to dump. Silently ignore
1608 unrecognized options; they may be aimed at toplev.c. */
1610 handle_OPT_d (const char *arg)
1614 while ((c = *arg++) != '\0')
1617 case 'M': /* Dump macros only. */
1618 case 'N': /* Dump names. */
1619 case 'D': /* Dump definitions. */
1620 case 'U': /* Dump used macros. */
1621 flag_dump_macros = c;
1625 flag_dump_includes = 1;