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();
236 /* By default, C99-like requirements for complex multiply and divide. */
237 flag_complex_method = 2;
239 deferred_opts = XNEWVEC (struct deferred_opt, argc);
241 result = lang_flags[c_language];
243 if (c_language == clk_c)
245 /* If preprocessing assembly language, accept any of the C-family
246 front end options since the driver may pass them through. */
247 for (i = 1; i < argc; i++)
248 if (! strcmp (argv[i], "-lang-asm"))
250 result |= CL_C | CL_ObjC | CL_CXX | CL_ObjCXX;
258 /* Handle switch SCODE with argument ARG. VALUE is true, unless no-
259 form of an -f or -W option was given. Returns 0 if the switch was
260 invalid, a negative number to prevent language-independent
261 processing in toplev.c (a hack necessary for the short-term). */
263 c_common_handle_option (size_t scode, const char *arg, int value)
265 const struct cl_option *option = &cl_options[scode];
266 enum opt_code code = (enum opt_code) scode;
269 /* Prevent resetting the language standard to a C dialect when the driver
270 has already determined that we're looking at assembler input. */
271 bool preprocessing_asm_p = (cpp_get_options (parse_in)->lang == CLK_ASM);
276 if (cl_options[code].flags & (CL_C | CL_CXX | CL_ObjC | CL_ObjCXX))
278 if ((option->flags & CL_TARGET)
279 && ! targetcm.handle_c_option (scode, arg, value))
286 case OPT__output_pch_:
291 defer_opt (code, arg);
295 cpp_opts->discard_comments = 0;
299 cpp_opts->discard_comments = 0;
300 cpp_opts->discard_comments_in_macro_exp = 0;
304 defer_opt (code, arg);
308 flag_preprocess_only = 1;
312 cpp_opts->print_include_names = 1;
316 TARGET_OPTF (xstrdup (arg));
320 if (strcmp (arg, "-"))
321 add_path (xstrdup (arg), BRACKET, 0, true);
324 if (quote_chain_split)
325 error ("-I- specified twice");
326 quote_chain_split = true;
327 split_quote_chain ();
328 inform (input_location, "obsolete option -I- used, please use -iquote instead");
334 /* When doing dependencies with -M or -MM, suppress normal
335 preprocessed output, but still do -dM etc. as software
336 depends on this. Preprocessed output does occur if -MD, -MMD
337 or environment var dependency generation is used. */
338 cpp_opts->deps.style = (code == OPT_M ? DEPS_SYSTEM: DEPS_USER);
344 cpp_opts->deps.style = (code == OPT_MD ? DEPS_SYSTEM: DEPS_USER);
355 cpp_opts->deps.missing_files = true;
360 cpp_opts->deps.phony_targets = true;
366 defer_opt (code, arg);
370 flag_no_line_commands = 1;
373 case OPT_fworking_directory:
374 flag_working_directory = value;
378 defer_opt (code, arg);
384 set_Wimplicit (value);
385 warn_char_subscripts = value;
386 warn_missing_braces = value;
387 warn_parentheses = value;
388 warn_return_type = value;
389 warn_sequence_point = value; /* Was C only. */
391 if (warn_strict_aliasing == -1)
392 set_Wstrict_aliasing (value);
393 warn_address = value;
394 if (warn_strict_overflow == -1)
395 warn_strict_overflow = value;
396 warn_array_bounds = value;
397 warn_volatile_register_var = value;
399 /* Only warn about unknown pragmas that are not in system
401 warn_unknown_pragmas = value;
403 /* We save the value of warn_uninitialized, since if they put
404 -Wuninitialized on the command line, we need to generate a
405 warning about not using it without also specifying -O. */
406 if (warn_uninitialized != 1)
407 warn_uninitialized = (value ? 2 : 0);
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;
454 case OPT_Wdeprecated:
455 cpp_opts->warn_deprecated = value;
458 case OPT_Wendif_labels:
459 cpp_opts->warn_endif_labels = value;
463 global_dc->warning_as_error_requested = value;
466 case OPT_Werror_implicit_function_declaration:
467 /* For backward compatibility, this is the same as
468 -Werror=implicit-function-declaration. */
469 enable_warning_as_error ("implicit-function-declaration", value, CL_C | CL_ObjC);
477 set_Wformat (atoi (arg));
481 set_Wimplicit (value);
485 /* Silently ignore for now. */
488 case OPT_Winvalid_pch:
489 cpp_opts->warn_invalid_pch = value;
492 case OPT_Wmissing_include_dirs:
493 cpp_opts->warn_missing_include_dirs = value;
497 cpp_opts->warn_multichar = value;
500 case OPT_Wnormalized_:
501 if (!value || (arg && strcasecmp (arg, "none") == 0))
502 cpp_opts->warn_normalize = normalized_none;
503 else if (!arg || strcasecmp (arg, "nfkc") == 0)
504 cpp_opts->warn_normalize = normalized_KC;
505 else if (strcasecmp (arg, "id") == 0)
506 cpp_opts->warn_normalize = normalized_identifier_C;
507 else if (strcasecmp (arg, "nfc") == 0)
508 cpp_opts->warn_normalize = normalized_C;
510 error ("argument %qs to %<-Wnormalized%> not recognized", arg);
513 case OPT_Wreturn_type:
514 warn_return_type = value;
517 case OPT_Wstrict_null_sentinel:
518 warn_strict_null_sentinel = value;
521 case OPT_Wtraditional:
522 cpp_opts->warn_traditional = value;
526 cpp_opts->warn_trigraphs = value;
530 cpp_opts->warn_undef = value;
533 case OPT_Wunknown_pragmas:
534 /* Set to greater than 1, so that even unknown pragmas in
535 system headers will be warned about. */
536 warn_unknown_pragmas = value * 2;
539 case OPT_Wunused_macros:
540 warn_unused_macros = value;
543 case OPT_Wvariadic_macros:
544 warn_variadic_macros = value;
547 case OPT_Wwrite_strings:
548 warn_write_strings = value;
554 warn_nonvdtor = true;
558 if (!c_dialect_cxx ())
559 set_std_c89 (false, true);
561 set_std_cxx98 (true);
568 case OPT_fcond_mismatch:
569 if (!c_dialect_cxx ())
571 flag_cond_mismatch = value;
576 case OPT_fall_virtual:
577 case OPT_falt_external_templates:
578 case OPT_fenum_int_equiv:
579 case OPT_fexternal_templates:
580 case OPT_fguiding_decls:
582 case OPT_fhuge_objects:
584 case OPT_fname_mangling_version_:
586 case OPT_fnonnull_objects:
588 case OPT_fstrict_prototype:
589 case OPT_fthis_is_variable:
590 case OPT_fvtable_thunks:
593 warning (0, "switch %qs is no longer supported", option->opt_text);
596 case OPT_faccess_control:
597 flag_access_control = value;
601 flag_no_asm = !value;
605 flag_no_builtin = !value;
612 disable_builtin_function (arg);
615 case OPT_fdirectives_only:
616 cpp_opts->directives_only = value;
619 case OPT_fdollars_in_identifiers:
620 cpp_opts->dollars_in_ident = value;
623 case OPT_ffreestanding:
625 /* Fall through.... */
628 flag_no_builtin = !value;
631 case OPT_fshort_double:
632 flag_short_double = value;
635 case OPT_fshort_enums:
636 flag_short_enums = value;
639 case OPT_fshort_wchar:
640 flag_short_wchar = value;
643 case OPT_fsigned_bitfields:
644 flag_signed_bitfields = value;
647 case OPT_fsigned_char:
648 flag_signed_char = value;
651 case OPT_funsigned_bitfields:
652 flag_signed_bitfields = !value;
655 case OPT_funsigned_char:
656 flag_signed_char = !value;
660 flag_check_new = value;
663 case OPT_fconserve_space:
664 flag_conserve_space = value;
667 case OPT_fconstant_string_class_:
668 constant_string_class_name = arg;
671 case OPT_fdefault_inline:
672 flag_default_inline = value;
675 case OPT_felide_constructors:
676 flag_elide_constructors = value;
679 case OPT_fenforce_eh_specs:
680 flag_enforce_eh_specs = value;
683 case OPT_fextended_identifiers:
684 cpp_opts->extended_identifiers = value;
688 flag_new_for_scope = value;
691 case OPT_fgnu_keywords:
692 flag_no_gnu_keywords = !value;
695 case OPT_fgnu_runtime:
696 flag_next_runtime = !value;
699 case OPT_fhandle_exceptions:
700 warning (0, "-fhandle-exceptions has been renamed -fexceptions (and is now on by default)");
701 flag_exceptions = value;
704 case OPT_fimplement_inlines:
705 flag_implement_inlines = value;
708 case OPT_fimplicit_inline_templates:
709 flag_implicit_inline_templates = value;
712 case OPT_fimplicit_templates:
713 flag_implicit_templates = value;
716 case OPT_flax_vector_conversions:
717 flag_lax_vector_conversions = value;
720 case OPT_fms_extensions:
721 flag_ms_extensions = value;
724 case OPT_fnext_runtime:
725 flag_next_runtime = value;
728 case OPT_fnil_receivers:
729 flag_nil_receivers = value;
732 case OPT_fnonansi_builtins:
733 flag_no_nonansi_builtin = !value;
736 case OPT_foperator_names:
737 cpp_opts->operator_names = value;
740 case OPT_foptional_diags:
741 flag_optional_diags = value;
745 cpp_opts->restore_pch_deps = value;
748 case OPT_fpch_preprocess:
749 flag_pch_preprocess = value;
752 case OPT_fpermissive:
753 flag_permissive = value;
756 case OPT_fpreprocessed:
757 cpp_opts->preprocessed = value;
760 case OPT_freplace_objc_classes:
761 flag_replace_objc_classes = value;
765 flag_use_repository = value;
767 flag_implicit_templates = 0;
774 case OPT_fshow_column:
775 cpp_opts->show_column = value;
779 flag_detailed_statistics = value;
783 /* It is documented that we silently ignore silly values. */
784 if (value >= 1 && value <= 100)
785 cpp_opts->tabstop = value;
788 case OPT_fexec_charset_:
789 cpp_opts->narrow_charset = arg;
792 case OPT_fwide_exec_charset_:
793 cpp_opts->wide_charset = arg;
796 case OPT_finput_charset_:
797 cpp_opts->input_charset = arg;
800 case OPT_ftemplate_depth_:
801 max_tinst_depth = value;
804 case OPT_fuse_cxa_atexit:
805 flag_use_cxa_atexit = value;
808 case OPT_fuse_cxa_get_exception_ptr:
809 flag_use_cxa_get_exception_ptr = value;
812 case OPT_fvisibility_inlines_hidden:
813 visibility_options.inlines_hidden = value;
820 case OPT_fthreadsafe_statics:
821 flag_threadsafe_statics = value;
824 case OPT_fpretty_templates:
825 flag_pretty_templates = value;
829 flag_zero_link = value;
833 flag_gen_declaration = 1;
836 case OPT_femit_struct_debug_baseonly:
837 set_struct_debug_option ("base");
840 case OPT_femit_struct_debug_reduced:
841 set_struct_debug_option ("dir:ord:sys,dir:gen:any,ind:base");
844 case OPT_femit_struct_debug_detailed_:
845 set_struct_debug_option (arg);
849 add_path (xstrdup (arg), AFTER, 0, true);
854 defer_opt (code, arg);
866 add_path (xstrdup (arg), QUOTE, 0, true);
874 add_path (xstrdup (arg), SYSTEM, 0, true);
877 case OPT_iwithprefix:
878 add_prefixed_path (arg, SYSTEM);
881 case OPT_iwithprefixbefore:
882 add_prefixed_path (arg, BRACKET);
886 cpp_set_lang (parse_in, CLK_ASM);
887 cpp_opts->dollars_in_ident = false;
906 error ("output filename specified twice");
909 /* We need to handle the -pedantic switches here, rather than in
910 c_common_post_options, so that a subsequent -Wno-endif-labels
911 is not overridden. */
912 case OPT_pedantic_errors:
914 cpp_opts->pedantic = 1;
915 cpp_opts->warn_endif_labels = 1;
916 if (warn_pointer_sign == -1)
917 warn_pointer_sign = 1;
918 if (warn_overlength_strings == -1)
919 warn_overlength_strings = 1;
924 case OPT_print_objc_runtime_info:
925 print_struct_values = 1;
928 case OPT_print_pch_checksum:
929 c_common_print_pch_checksum (stdout);
930 exit_after_options = true;
938 case OPT_std_gnu__98:
939 if (!preprocessing_asm_p)
940 set_std_cxx98 (code == OPT_std_c__98 /* ISO */);
944 case OPT_std_gnu__0x:
945 if (!preprocessing_asm_p)
946 set_std_cxx0x (code == OPT_std_c__0x /* ISO */);
950 case OPT_std_iso9899_1990:
951 case OPT_std_iso9899_199409:
952 if (!preprocessing_asm_p)
953 set_std_c89 (code == OPT_std_iso9899_199409 /* c94 */, true /* ISO */);
957 if (!preprocessing_asm_p)
958 set_std_c89 (false /* c94 */, false /* ISO */);
963 case OPT_std_iso9899_1999:
964 case OPT_std_iso9899_199x:
965 if (!preprocessing_asm_p)
966 set_std_c99 (true /* ISO */);
971 if (!preprocessing_asm_p)
972 set_std_c99 (false /* ISO */);
976 cpp_opts->trigraphs = 1;
979 case OPT_traditional_cpp:
980 cpp_opts->traditional = 1;
999 /* Post-switch processing. */
1001 c_common_post_options (const char **pfilename)
1003 struct cpp_callbacks *cb;
1005 /* Canonicalize the input and output filenames. */
1006 if (in_fnames == NULL)
1008 in_fnames = XNEWVEC (const char *, 1);
1011 else if (strcmp (in_fnames[0], "-") == 0)
1014 if (out_fname == NULL || !strcmp (out_fname, "-"))
1017 if (cpp_opts->deps.style == DEPS_NONE)
1018 check_deps_environment_vars ();
1020 handle_deferred_opts ();
1022 sanitize_cpp_opts ();
1024 register_include_chains (parse_in, sysroot, iprefix, imultilib,
1025 std_inc, std_cxx_inc && c_dialect_cxx (), verbose);
1027 #ifdef C_COMMON_OVERRIDE_OPTIONS
1028 /* Some machines may reject certain combinations of C
1029 language-specific options. */
1030 C_COMMON_OVERRIDE_OPTIONS;
1033 /* Excess precision other than "fast" requires front-end
1035 if (c_dialect_cxx ())
1037 if (flag_excess_precision_cmdline == EXCESS_PRECISION_STANDARD
1038 && TARGET_FLT_EVAL_METHOD_NON_DEFAULT)
1039 sorry ("-fexcess-precision=standard for C++");
1040 flag_excess_precision_cmdline = EXCESS_PRECISION_FAST;
1042 else if (flag_excess_precision_cmdline == EXCESS_PRECISION_DEFAULT)
1043 flag_excess_precision_cmdline = (flag_iso
1044 ? EXCESS_PRECISION_STANDARD
1045 : EXCESS_PRECISION_FAST);
1047 /* By default we use C99 inline semantics in GNU99 or C99 mode. C99
1048 inline semantics are not supported in GNU89 or C89 mode. */
1049 if (flag_gnu89_inline == -1)
1050 flag_gnu89_inline = !flag_isoc99;
1051 else if (!flag_gnu89_inline && !flag_isoc99)
1052 error ("-fno-gnu89-inline is only supported in GNU99 or C99 mode");
1054 /* Default to ObjC sjlj exception handling if NeXT runtime. */
1055 if (flag_objc_sjlj_exceptions < 0)
1056 flag_objc_sjlj_exceptions = flag_next_runtime;
1057 if (flag_objc_exceptions && !flag_objc_sjlj_exceptions)
1058 flag_exceptions = 1;
1060 /* -Wextra implies -Wtype-limits, -Wclobbered,
1061 -Wempty-body, -Wsign-compare,
1062 -Wmissing-field-initializers, -Wmissing-parameter-type
1063 -Wold-style-declaration, -Woverride-init and -Wignored-qualifiers
1064 but not if explicitly overridden. */
1065 if (warn_type_limits == -1)
1066 warn_type_limits = extra_warnings;
1067 if (warn_clobbered == -1)
1068 warn_clobbered = extra_warnings;
1069 if (warn_empty_body == -1)
1070 warn_empty_body = extra_warnings;
1071 if (warn_sign_compare == -1)
1072 warn_sign_compare = extra_warnings;
1073 if (warn_missing_field_initializers == -1)
1074 warn_missing_field_initializers = extra_warnings;
1075 if (warn_missing_parameter_type == -1)
1076 warn_missing_parameter_type = extra_warnings;
1077 if (warn_old_style_declaration == -1)
1078 warn_old_style_declaration = extra_warnings;
1079 if (warn_override_init == -1)
1080 warn_override_init = extra_warnings;
1081 if (warn_ignored_qualifiers == -1)
1082 warn_ignored_qualifiers = extra_warnings;
1083 if (warn_logical_op == -1)
1084 warn_logical_op = 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;
1096 /* -Woverlength-strings is off by default, but is enabled by -pedantic.
1097 It is never enabled in C++, as the minimum limit is not normative
1098 in that standard. */
1099 if (warn_overlength_strings == -1 || c_dialect_cxx ())
1100 warn_overlength_strings = 0;
1102 /* Wmain is enabled by default in C++ but not in C. */
1103 /* Wmain is disabled by default for -ffreestanding (!flag_hosted),
1104 even if -Wall was given (warn_main will be 2 if set by -Wall, 1
1105 if set by -Wmain). */
1106 if (warn_main == -1)
1107 warn_main = (c_dialect_cxx () && flag_hosted) ? 1 : 0;
1108 else if (warn_main == 2)
1109 warn_main = flag_hosted ? 1 : 0;
1111 /* In C, -Wconversion enables -Wsign-conversion (unless disabled
1112 through -Wno-sign-conversion). While in C++,
1113 -Wsign-conversion needs to be requested explicitly. */
1114 if (warn_sign_conversion == -1)
1115 warn_sign_conversion = (c_dialect_cxx ()) ? 0 : warn_conversion;
1117 /* In C, -Wall and -Wc++-compat enable -Wenum-compare, which we do
1118 in c_common_handle_option; if it has not yet been set, it is
1119 disabled by default. In C++, it is enabled by default. */
1120 if (warn_enum_compare == -1)
1121 warn_enum_compare = c_dialect_cxx () ? 1 : 0;
1123 /* -Wpacked-bitfield-compat is on by default for the C languages. The
1124 warning is issued in stor-layout.c which is not part of the front-end so
1125 we need to selectively turn it on here. */
1126 if (warn_packed_bitfield_compat == -1)
1127 warn_packed_bitfield_compat = 1;
1129 /* Special format checking options don't work without -Wformat; warn if
1133 warning (OPT_Wformat_y2k,
1134 "-Wformat-y2k ignored without -Wformat");
1135 warning (OPT_Wformat_extra_args,
1136 "-Wformat-extra-args ignored without -Wformat");
1137 warning (OPT_Wformat_zero_length,
1138 "-Wformat-zero-length ignored without -Wformat");
1139 warning (OPT_Wformat_nonliteral,
1140 "-Wformat-nonliteral ignored without -Wformat");
1141 warning (OPT_Wformat_contains_nul,
1142 "-Wformat-contains-nul ignored without -Wformat");
1143 warning (OPT_Wformat_security,
1144 "-Wformat-security ignored without -Wformat");
1147 /* -Wimplicit-function-declaration is enabled by default for C99. */
1148 if (warn_implicit_function_declaration == -1)
1149 warn_implicit_function_declaration = flag_isoc99;
1151 /* If we're allowing C++0x constructs, don't warn about C++0x
1152 compatibility problems. */
1153 if (cxx_dialect == cxx0x)
1154 warn_cxx0x_compat = 0;
1156 if (flag_preprocess_only)
1158 /* Open the output now. We must do so even if flag_no_output is
1159 on, because there may be other output than from the actual
1160 preprocessing (e.g. from -dM). */
1161 if (out_fname[0] == '\0')
1162 out_stream = stdout;
1164 out_stream = fopen (out_fname, "w");
1166 if (out_stream == NULL)
1168 fatal_error ("opening output file %s: %m", out_fname);
1172 if (num_in_fnames > 1)
1173 error ("too many filenames given. Type %s --help for usage",
1176 init_pp_output (out_stream);
1182 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1183 input_location = UNKNOWN_LOCATION;
1186 cb = cpp_get_callbacks (parse_in);
1187 cb->file_change = cb_file_change;
1188 cb->dir_change = cb_dir_change;
1189 cpp_post_options (parse_in);
1191 input_location = UNKNOWN_LOCATION;
1193 *pfilename = this_input_filename
1194 = cpp_read_main_file (parse_in, in_fnames[0]);
1195 /* Don't do any compilation or preprocessing if there is no input file. */
1196 if (this_input_filename == NULL)
1202 if (flag_working_directory
1203 && flag_preprocess_only && !flag_no_line_commands)
1204 pp_dir_change (parse_in, get_src_pwd ());
1206 return flag_preprocess_only;
1209 /* Front end initialization common to C, ObjC and C++. */
1211 c_common_init (void)
1213 /* Set up preprocessor arithmetic. Must be done after call to
1214 c_common_nodes_and_builtins for type nodes to be good. */
1215 cpp_opts->precision = TYPE_PRECISION (intmax_type_node);
1216 cpp_opts->char_precision = TYPE_PRECISION (char_type_node);
1217 cpp_opts->int_precision = TYPE_PRECISION (integer_type_node);
1218 cpp_opts->wchar_precision = TYPE_PRECISION (wchar_type_node);
1219 cpp_opts->unsigned_wchar = TYPE_UNSIGNED (wchar_type_node);
1220 cpp_opts->bytes_big_endian = BYTES_BIG_ENDIAN;
1222 /* This can't happen until after wchar_precision and bytes_big_endian
1224 cpp_init_iconv (parse_in);
1227 c_common_print_pch_checksum (stderr);
1229 /* Has to wait until now so that cpplib has its hash table. */
1232 if (flag_preprocess_only)
1235 preprocess_file (parse_in);
1242 /* Initialize the integrated preprocessor after debug output has been
1243 initialized; loop over each input file. */
1245 c_common_parse_file (int set_yydebug)
1253 warning(0, "The C parser does not support -dy, option ignored");
1257 "The Objective-C parser does not support -dy, option ignored");
1260 warning(0, "The C++ parser does not support -dy, option ignored");
1264 "The Objective-C++ parser does not support -dy, option ignored");
1273 /* Start the main input file, if the debug writer wants it. */
1274 if (debug_hooks->start_end_main_source_file)
1275 (*debug_hooks->start_source_file) (0, this_input_filename);
1282 /* And end the main input file, if the debug writer wants it */
1283 if (debug_hooks->start_end_main_source_file)
1284 (*debug_hooks->end_source_file) (0);
1285 if (++i >= num_in_fnames)
1287 cpp_undef_all (parse_in);
1288 cpp_clear_file_cache (parse_in);
1290 = cpp_read_main_file (parse_in, in_fnames[i]);
1291 /* If an input file is missing, abandon further compilation.
1292 cpplib has issued a diagnostic. */
1293 if (!this_input_filename)
1298 /* Common finish hook for the C, ObjC and C++ front ends. */
1300 c_common_finish (void)
1302 FILE *deps_stream = NULL;
1304 /* Don't write the deps file if there are errors. */
1305 if (cpp_opts->deps.style != DEPS_NONE && errorcount == 0)
1307 /* If -M or -MM was seen without -MF, default output to the
1310 deps_stream = out_stream;
1313 deps_stream = fopen (deps_file, deps_append ? "a": "w");
1315 fatal_error ("opening dependency file %s: %m", deps_file);
1319 /* For performance, avoid tearing down cpplib's internal structures
1320 with cpp_destroy (). */
1321 cpp_finish (parse_in, deps_stream);
1323 if (deps_stream && deps_stream != out_stream
1324 && (ferror (deps_stream) || fclose (deps_stream)))
1325 fatal_error ("closing dependency file %s: %m", deps_file);
1327 if (out_stream && (ferror (out_stream) || fclose (out_stream)))
1328 fatal_error ("when writing output to %s: %m", out_fname);
1331 /* Either of two environment variables can specify output of
1332 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1333 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1334 and DEPS_TARGET is the target to mention in the deps. They also
1335 result in dependency information being appended to the output file
1336 rather than overwriting it, and like Sun's compiler
1337 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1339 check_deps_environment_vars (void)
1343 GET_ENVIRONMENT (spec, "DEPENDENCIES_OUTPUT");
1345 cpp_opts->deps.style = DEPS_USER;
1348 GET_ENVIRONMENT (spec, "SUNPRO_DEPENDENCIES");
1351 cpp_opts->deps.style = DEPS_SYSTEM;
1352 cpp_opts->deps.ignore_main_file = true;
1358 /* Find the space before the DEPS_TARGET, if there is one. */
1359 char *s = strchr (spec, ' ');
1362 /* Let the caller perform MAKE quoting. */
1363 defer_opt (OPT_MT, s + 1);
1367 /* Command line -MF overrides environment variables and default. */
1376 /* Handle deferred command line switches. */
1378 handle_deferred_opts (void)
1383 /* Avoid allocating the deps buffer if we don't need it.
1384 (This flag may be true without there having been -MT or -MQ
1385 options, but we'll still need the deps buffer.) */
1389 deps = cpp_get_deps (parse_in);
1391 for (i = 0; i < deferred_count; i++)
1393 struct deferred_opt *opt = &deferred_opts[i];
1395 if (opt->code == OPT_MT || opt->code == OPT_MQ)
1396 deps_add_target (deps, opt->arg, opt->code == OPT_MQ);
1400 /* These settings are appropriate for GCC, but not necessarily so for
1401 cpplib as a library. */
1403 sanitize_cpp_opts (void)
1405 /* If we don't know what style of dependencies to output, complain
1406 if any other dependency switches have been given. */
1407 if (deps_seen && cpp_opts->deps.style == DEPS_NONE)
1408 error ("to generate dependencies you must specify either -M or -MM");
1410 /* -dM and dependencies suppress normal output; do it here so that
1411 the last -d[MDN] switch overrides earlier ones. */
1412 if (flag_dump_macros == 'M')
1415 /* By default, -fdirectives-only implies -dD. This allows subsequent phases
1416 to perform proper macro expansion. */
1417 if (cpp_opts->directives_only && !cpp_opts->preprocessed && !flag_dump_macros)
1418 flag_dump_macros = 'D';
1420 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1421 -dM since at least glibc relies on -M -dM to work. */
1422 /* Also, flag_no_output implies flag_no_line_commands, always. */
1425 if (flag_dump_macros != 'M')
1426 flag_dump_macros = 0;
1427 flag_dump_includes = 0;
1428 flag_no_line_commands = 1;
1430 else if (cpp_opts->deps.missing_files)
1431 error ("-MG may only be used with -M or -MM");
1433 cpp_opts->unsigned_char = !flag_signed_char;
1434 cpp_opts->stdc_0_in_system_headers = STDC_0_IN_SYSTEM_HEADERS;
1436 /* We want -Wno-long-long to override -pedantic -std=non-c99
1437 and/or -Wtraditional, whatever the ordering. */
1438 cpp_opts->warn_long_long
1439 = warn_long_long && ((pedantic
1440 && (c_dialect_cxx ()
1441 ? cxx_dialect == cxx98
1443 || warn_traditional);
1445 /* Similarly with -Wno-variadic-macros. No check for c99 here, since
1446 this also turns off warnings about GCCs extension. */
1447 cpp_opts->warn_variadic_macros
1448 = warn_variadic_macros && (pedantic || warn_traditional);
1450 /* If we're generating preprocessor output, emit current directory
1451 if explicitly requested or if debugging information is enabled.
1452 ??? Maybe we should only do it for debugging formats that
1453 actually output the current directory? */
1454 if (flag_working_directory == -1)
1455 flag_working_directory = (debug_info_level != DINFO_LEVEL_NONE);
1457 if (cpp_opts->directives_only)
1459 if (warn_unused_macros)
1460 error ("-fdirectives-only is incompatible with -Wunused_macros");
1461 if (cpp_opts->traditional)
1462 error ("-fdirectives-only is incompatible with -traditional");
1466 /* Add include path with a prefix at the front of its name. */
1468 add_prefixed_path (const char *suffix, size_t chain)
1472 size_t prefix_len, suffix_len;
1474 suffix_len = strlen (suffix);
1475 prefix = iprefix ? iprefix : cpp_GCC_INCLUDE_DIR;
1476 prefix_len = iprefix ? strlen (iprefix) : cpp_GCC_INCLUDE_DIR_len;
1478 path = (char *) xmalloc (prefix_len + suffix_len + 1);
1479 memcpy (path, prefix, prefix_len);
1480 memcpy (path + prefix_len, suffix, suffix_len);
1481 path[prefix_len + suffix_len] = '\0';
1483 add_path (path, chain, 0, false);
1486 /* Handle -D, -U, -A, -imacros, and the first -include. */
1488 finish_options (void)
1490 if (!cpp_opts->preprocessed)
1494 cb_file_change (parse_in,
1495 linemap_add (line_table, LC_RENAME, 0,
1496 _("<built-in>"), 0));
1498 cpp_init_builtins (parse_in, flag_hosted);
1499 c_cpp_builtins (parse_in);
1501 /* We're about to send user input to cpplib, so make it warn for
1502 things that we previously (when we sent it internal definitions)
1503 told it to not warn.
1505 C99 permits implementation-defined characters in identifiers.
1506 The documented meaning of -std= is to turn off extensions that
1507 conflict with the specified standard, and since a strictly
1508 conforming program cannot contain a '$', we do not condition
1509 their acceptance on the -std= setting. */
1510 cpp_opts->warn_dollars = (cpp_opts->pedantic && !cpp_opts->c99);
1512 cb_file_change (parse_in,
1513 linemap_add (line_table, LC_RENAME, 0,
1514 _("<command-line>"), 0));
1516 for (i = 0; i < deferred_count; i++)
1518 struct deferred_opt *opt = &deferred_opts[i];
1520 if (opt->code == OPT_D)
1521 cpp_define (parse_in, opt->arg);
1522 else if (opt->code == OPT_U)
1523 cpp_undef (parse_in, opt->arg);
1524 else if (opt->code == OPT_A)
1526 if (opt->arg[0] == '-')
1527 cpp_unassert (parse_in, opt->arg + 1);
1529 cpp_assert (parse_in, opt->arg);
1533 /* Handle -imacros after -D and -U. */
1534 for (i = 0; i < deferred_count; i++)
1536 struct deferred_opt *opt = &deferred_opts[i];
1538 if (opt->code == OPT_imacros
1539 && cpp_push_include (parse_in, opt->arg))
1541 /* Disable push_command_line_include callback for now. */
1542 include_cursor = deferred_count + 1;
1543 cpp_scan_nooutput (parse_in);
1547 else if (cpp_opts->directives_only)
1548 cpp_init_special_builtins (parse_in);
1551 push_command_line_include ();
1554 /* Give CPP the next file given by -include, if any. */
1556 push_command_line_include (void)
1558 while (include_cursor < deferred_count)
1560 struct deferred_opt *opt = &deferred_opts[include_cursor++];
1562 if (!cpp_opts->preprocessed && opt->code == OPT_include
1563 && cpp_push_include (parse_in, opt->arg))
1567 if (include_cursor == deferred_count)
1570 /* -Wunused-macros should only warn about macros defined hereafter. */
1571 cpp_opts->warn_unused_macros = warn_unused_macros;
1572 /* Restore the line map from <command line>. */
1573 if (!cpp_opts->preprocessed)
1574 cpp_change_file (parse_in, LC_RENAME, this_input_filename);
1576 /* Set this here so the client can change the option if it wishes,
1577 and after stacking the main file so we don't trace the main file. */
1578 line_table->trace_includes = cpp_opts->print_include_names;
1582 /* File change callback. Has to handle -include files. */
1584 cb_file_change (cpp_reader * ARG_UNUSED (pfile),
1585 const struct line_map *new_map)
1587 if (flag_preprocess_only)
1588 pp_file_change (new_map);
1590 fe_file_change (new_map);
1592 if (new_map == 0 || (new_map->reason == LC_LEAVE && MAIN_FILE_P (new_map)))
1593 push_command_line_include ();
1597 cb_dir_change (cpp_reader * ARG_UNUSED (pfile), const char *dir)
1599 if (!set_src_pwd (dir))
1600 warning (0, "too late for # directive to set debug directory");
1603 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1604 extensions if ISO). There is no concept of gnu94. */
1606 set_std_c89 (int c94, int iso)
1608 cpp_set_lang (parse_in, c94 ? CLK_STDC94: iso ? CLK_STDC89: CLK_GNUC89);
1611 flag_no_gnu_keywords = iso;
1612 flag_no_nonansi_builtin = iso;
1617 /* Set the C 99 standard (without GNU extensions if ISO). */
1619 set_std_c99 (int iso)
1621 cpp_set_lang (parse_in, iso ? CLK_STDC99: CLK_GNUC99);
1623 flag_no_nonansi_builtin = iso;
1629 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1631 set_std_cxx98 (int iso)
1633 cpp_set_lang (parse_in, iso ? CLK_CXX98: CLK_GNUCXX);
1634 flag_no_gnu_keywords = iso;
1635 flag_no_nonansi_builtin = iso;
1637 cxx_dialect = cxx98;
1640 /* Set the C++ 0x working draft "standard" (without GNU extensions if ISO). */
1642 set_std_cxx0x (int iso)
1644 cpp_set_lang (parse_in, iso ? CLK_CXX0X: CLK_GNUCXX0X);
1645 flag_no_gnu_keywords = iso;
1646 flag_no_nonansi_builtin = iso;
1648 cxx_dialect = cxx0x;
1651 /* Handle setting implicit to ON. */
1653 set_Wimplicit (int on)
1656 warn_implicit_int = on;
1657 warn_implicit_function_declaration = on;
1660 /* Args to -d specify what to dump. Silently ignore
1661 unrecognized options; they may be aimed at toplev.c. */
1663 handle_OPT_d (const char *arg)
1667 while ((c = *arg++) != '\0')
1670 case 'M': /* Dump macros only. */
1671 case 'N': /* Dump names. */
1672 case 'D': /* Dump definitions. */
1673 case 'U': /* Dump used macros. */
1674 flag_dump_macros = c;
1678 flag_dump_includes = 1;