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 warn_uninitialized = value;
405 if (!c_dialect_cxx ())
407 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding
408 can turn it off only if it's not explicit. */
410 warn_main = (value ? 2 : 0);
412 /* In C, -Wall turns on -Wenum-compare, which we do here.
413 In C++ it is on by default, which is done in
414 c_common_post_options. */
415 if (warn_enum_compare == -1)
416 warn_enum_compare = value;
420 /* C++-specific warnings. */
421 warn_sign_compare = value;
422 warn_reorder = value;
423 warn_cxx0x_compat = value;
426 cpp_opts->warn_trigraphs = value;
427 cpp_opts->warn_comments = value;
428 cpp_opts->warn_num_sign_change = value;
430 if (warn_pointer_sign == -1)
431 warn_pointer_sign = value;
434 case OPT_Wbuiltin_macro_redefined:
435 cpp_opts->warn_builtin_macro_redefined = value;
440 cpp_opts->warn_comments = value;
443 case OPT_Wc___compat:
444 /* Because -Wenum-compare is the default in C++, -Wc++-compat
445 implies -Wenum-compare. */
446 if (warn_enum_compare == -1 && value)
447 warn_enum_compare = value;
450 case OPT_Wdeprecated:
451 cpp_opts->warn_deprecated = value;
454 case OPT_Wendif_labels:
455 cpp_opts->warn_endif_labels = value;
459 global_dc->warning_as_error_requested = value;
462 case OPT_Werror_implicit_function_declaration:
463 /* For backward compatibility, this is the same as
464 -Werror=implicit-function-declaration. */
465 enable_warning_as_error ("implicit-function-declaration", value, CL_C | CL_ObjC);
473 set_Wformat (atoi (arg));
477 set_Wimplicit (value);
481 /* Silently ignore for now. */
484 case OPT_Winvalid_pch:
485 cpp_opts->warn_invalid_pch = value;
488 case OPT_Wmissing_include_dirs:
489 cpp_opts->warn_missing_include_dirs = value;
493 cpp_opts->warn_multichar = value;
496 case OPT_Wnormalized_:
497 if (!value || (arg && strcasecmp (arg, "none") == 0))
498 cpp_opts->warn_normalize = normalized_none;
499 else if (!arg || strcasecmp (arg, "nfkc") == 0)
500 cpp_opts->warn_normalize = normalized_KC;
501 else if (strcasecmp (arg, "id") == 0)
502 cpp_opts->warn_normalize = normalized_identifier_C;
503 else if (strcasecmp (arg, "nfc") == 0)
504 cpp_opts->warn_normalize = normalized_C;
506 error ("argument %qs to %<-Wnormalized%> not recognized", arg);
509 case OPT_Wreturn_type:
510 warn_return_type = value;
513 case OPT_Wstrict_null_sentinel:
514 warn_strict_null_sentinel = value;
517 case OPT_Wtraditional:
518 cpp_opts->warn_traditional = value;
522 cpp_opts->warn_trigraphs = value;
526 cpp_opts->warn_undef = value;
529 case OPT_Wunknown_pragmas:
530 /* Set to greater than 1, so that even unknown pragmas in
531 system headers will be warned about. */
532 warn_unknown_pragmas = value * 2;
535 case OPT_Wunused_macros:
536 warn_unused_macros = value;
539 case OPT_Wvariadic_macros:
540 warn_variadic_macros = value;
543 case OPT_Wwrite_strings:
544 warn_write_strings = value;
550 warn_nonvdtor = true;
554 if (!c_dialect_cxx ())
555 set_std_c89 (false, true);
557 set_std_cxx98 (true);
564 case OPT_fcond_mismatch:
565 if (!c_dialect_cxx ())
567 flag_cond_mismatch = value;
572 case OPT_fall_virtual:
573 case OPT_falt_external_templates:
574 case OPT_fenum_int_equiv:
575 case OPT_fexternal_templates:
576 case OPT_fguiding_decls:
578 case OPT_fhuge_objects:
580 case OPT_fname_mangling_version_:
582 case OPT_fnonnull_objects:
584 case OPT_fstrict_prototype:
585 case OPT_fthis_is_variable:
586 case OPT_fvtable_thunks:
589 warning (0, "switch %qs is no longer supported", option->opt_text);
592 case OPT_faccess_control:
593 flag_access_control = value;
597 flag_no_asm = !value;
601 flag_no_builtin = !value;
608 disable_builtin_function (arg);
611 case OPT_fdirectives_only:
612 cpp_opts->directives_only = value;
615 case OPT_fdollars_in_identifiers:
616 cpp_opts->dollars_in_ident = value;
619 case OPT_ffreestanding:
621 /* Fall through.... */
624 flag_no_builtin = !value;
627 case OPT_fshort_double:
628 flag_short_double = value;
631 case OPT_fshort_enums:
632 flag_short_enums = value;
635 case OPT_fshort_wchar:
636 flag_short_wchar = value;
639 case OPT_fsigned_bitfields:
640 flag_signed_bitfields = value;
643 case OPT_fsigned_char:
644 flag_signed_char = value;
647 case OPT_funsigned_bitfields:
648 flag_signed_bitfields = !value;
651 case OPT_funsigned_char:
652 flag_signed_char = !value;
656 flag_check_new = value;
659 case OPT_fconserve_space:
660 flag_conserve_space = value;
663 case OPT_fconstant_string_class_:
664 constant_string_class_name = arg;
667 case OPT_fdefault_inline:
668 flag_default_inline = value;
671 case OPT_felide_constructors:
672 flag_elide_constructors = value;
675 case OPT_fenforce_eh_specs:
676 flag_enforce_eh_specs = value;
679 case OPT_fextended_identifiers:
680 cpp_opts->extended_identifiers = value;
684 flag_new_for_scope = value;
687 case OPT_fgnu_keywords:
688 flag_no_gnu_keywords = !value;
691 case OPT_fgnu_runtime:
692 flag_next_runtime = !value;
695 case OPT_fhandle_exceptions:
696 warning (0, "-fhandle-exceptions has been renamed -fexceptions (and is now on by default)");
697 flag_exceptions = value;
700 case OPT_fimplement_inlines:
701 flag_implement_inlines = value;
704 case OPT_fimplicit_inline_templates:
705 flag_implicit_inline_templates = value;
708 case OPT_fimplicit_templates:
709 flag_implicit_templates = value;
712 case OPT_flax_vector_conversions:
713 flag_lax_vector_conversions = value;
716 case OPT_fms_extensions:
717 flag_ms_extensions = value;
720 case OPT_fnext_runtime:
721 flag_next_runtime = value;
724 case OPT_fnil_receivers:
725 flag_nil_receivers = value;
728 case OPT_fnonansi_builtins:
729 flag_no_nonansi_builtin = !value;
732 case OPT_foperator_names:
733 cpp_opts->operator_names = value;
736 case OPT_foptional_diags:
737 flag_optional_diags = value;
741 cpp_opts->restore_pch_deps = value;
744 case OPT_fpch_preprocess:
745 flag_pch_preprocess = value;
748 case OPT_fpermissive:
749 flag_permissive = value;
752 case OPT_fpreprocessed:
753 cpp_opts->preprocessed = value;
756 case OPT_freplace_objc_classes:
757 flag_replace_objc_classes = value;
761 flag_use_repository = value;
763 flag_implicit_templates = 0;
770 case OPT_fshow_column:
771 cpp_opts->show_column = value;
775 flag_detailed_statistics = value;
779 /* It is documented that we silently ignore silly values. */
780 if (value >= 1 && value <= 100)
781 cpp_opts->tabstop = value;
784 case OPT_fexec_charset_:
785 cpp_opts->narrow_charset = arg;
788 case OPT_fwide_exec_charset_:
789 cpp_opts->wide_charset = arg;
792 case OPT_finput_charset_:
793 cpp_opts->input_charset = arg;
796 case OPT_ftemplate_depth_:
797 max_tinst_depth = value;
800 case OPT_fuse_cxa_atexit:
801 flag_use_cxa_atexit = value;
804 case OPT_fuse_cxa_get_exception_ptr:
805 flag_use_cxa_get_exception_ptr = value;
808 case OPT_fvisibility_inlines_hidden:
809 visibility_options.inlines_hidden = value;
816 case OPT_fthreadsafe_statics:
817 flag_threadsafe_statics = value;
820 case OPT_fpretty_templates:
821 flag_pretty_templates = value;
825 flag_zero_link = value;
829 flag_gen_declaration = 1;
832 case OPT_femit_struct_debug_baseonly:
833 set_struct_debug_option ("base");
836 case OPT_femit_struct_debug_reduced:
837 set_struct_debug_option ("dir:ord:sys,dir:gen:any,ind:base");
840 case OPT_femit_struct_debug_detailed_:
841 set_struct_debug_option (arg);
845 add_path (xstrdup (arg), AFTER, 0, true);
850 defer_opt (code, arg);
862 add_path (xstrdup (arg), QUOTE, 0, true);
870 add_path (xstrdup (arg), SYSTEM, 0, true);
873 case OPT_iwithprefix:
874 add_prefixed_path (arg, SYSTEM);
877 case OPT_iwithprefixbefore:
878 add_prefixed_path (arg, BRACKET);
882 cpp_set_lang (parse_in, CLK_ASM);
883 cpp_opts->dollars_in_ident = false;
902 error ("output filename specified twice");
905 /* We need to handle the -pedantic switches here, rather than in
906 c_common_post_options, so that a subsequent -Wno-endif-labels
907 is not overridden. */
908 case OPT_pedantic_errors:
910 cpp_opts->pedantic = 1;
911 cpp_opts->warn_endif_labels = 1;
912 if (warn_pointer_sign == -1)
913 warn_pointer_sign = 1;
914 if (warn_overlength_strings == -1)
915 warn_overlength_strings = 1;
920 case OPT_print_objc_runtime_info:
921 print_struct_values = 1;
924 case OPT_print_pch_checksum:
925 c_common_print_pch_checksum (stdout);
926 exit_after_options = true;
934 case OPT_std_gnu__98:
935 if (!preprocessing_asm_p)
936 set_std_cxx98 (code == OPT_std_c__98 /* ISO */);
940 case OPT_std_gnu__0x:
941 if (!preprocessing_asm_p)
942 set_std_cxx0x (code == OPT_std_c__0x /* ISO */);
946 case OPT_std_iso9899_1990:
947 case OPT_std_iso9899_199409:
948 if (!preprocessing_asm_p)
949 set_std_c89 (code == OPT_std_iso9899_199409 /* c94 */, true /* ISO */);
953 if (!preprocessing_asm_p)
954 set_std_c89 (false /* c94 */, false /* ISO */);
959 case OPT_std_iso9899_1999:
960 case OPT_std_iso9899_199x:
961 if (!preprocessing_asm_p)
962 set_std_c99 (true /* ISO */);
967 if (!preprocessing_asm_p)
968 set_std_c99 (false /* ISO */);
972 cpp_opts->trigraphs = 1;
975 case OPT_traditional_cpp:
976 cpp_opts->traditional = 1;
995 /* Post-switch processing. */
997 c_common_post_options (const char **pfilename)
999 struct cpp_callbacks *cb;
1001 /* Canonicalize the input and output filenames. */
1002 if (in_fnames == NULL)
1004 in_fnames = XNEWVEC (const char *, 1);
1007 else if (strcmp (in_fnames[0], "-") == 0)
1010 if (out_fname == NULL || !strcmp (out_fname, "-"))
1013 if (cpp_opts->deps.style == DEPS_NONE)
1014 check_deps_environment_vars ();
1016 handle_deferred_opts ();
1018 sanitize_cpp_opts ();
1020 register_include_chains (parse_in, sysroot, iprefix, imultilib,
1021 std_inc, std_cxx_inc && c_dialect_cxx (), verbose);
1023 #ifdef C_COMMON_OVERRIDE_OPTIONS
1024 /* Some machines may reject certain combinations of C
1025 language-specific options. */
1026 C_COMMON_OVERRIDE_OPTIONS;
1029 /* Excess precision other than "fast" requires front-end
1031 if (c_dialect_cxx ())
1033 if (flag_excess_precision_cmdline == EXCESS_PRECISION_STANDARD
1034 && TARGET_FLT_EVAL_METHOD_NON_DEFAULT)
1035 sorry ("-fexcess-precision=standard for C++");
1036 flag_excess_precision_cmdline = EXCESS_PRECISION_FAST;
1038 else if (flag_excess_precision_cmdline == EXCESS_PRECISION_DEFAULT)
1039 flag_excess_precision_cmdline = (flag_iso
1040 ? EXCESS_PRECISION_STANDARD
1041 : EXCESS_PRECISION_FAST);
1043 /* By default we use C99 inline semantics in GNU99 or C99 mode. C99
1044 inline semantics are not supported in GNU89 or C89 mode. */
1045 if (flag_gnu89_inline == -1)
1046 flag_gnu89_inline = !flag_isoc99;
1047 else if (!flag_gnu89_inline && !flag_isoc99)
1048 error ("-fno-gnu89-inline is only supported in GNU99 or C99 mode");
1050 /* Default to ObjC sjlj exception handling if NeXT runtime. */
1051 if (flag_objc_sjlj_exceptions < 0)
1052 flag_objc_sjlj_exceptions = flag_next_runtime;
1053 if (flag_objc_exceptions && !flag_objc_sjlj_exceptions)
1054 flag_exceptions = 1;
1056 /* -Wextra implies the following flags
1057 unless explicitly overridden. */
1058 if (warn_type_limits == -1)
1059 warn_type_limits = extra_warnings;
1060 if (warn_clobbered == -1)
1061 warn_clobbered = extra_warnings;
1062 if (warn_empty_body == -1)
1063 warn_empty_body = extra_warnings;
1064 if (warn_sign_compare == -1)
1065 warn_sign_compare = extra_warnings;
1066 if (warn_missing_field_initializers == -1)
1067 warn_missing_field_initializers = extra_warnings;
1068 if (warn_missing_parameter_type == -1)
1069 warn_missing_parameter_type = extra_warnings;
1070 if (warn_old_style_declaration == -1)
1071 warn_old_style_declaration = extra_warnings;
1072 if (warn_override_init == -1)
1073 warn_override_init = extra_warnings;
1074 if (warn_ignored_qualifiers == -1)
1075 warn_ignored_qualifiers = extra_warnings;
1076 if (warn_logical_op == -1)
1077 warn_logical_op = extra_warnings;
1079 /* -Wpointer-sign is disabled by default, but it is enabled if any
1080 of -Wall or -pedantic are given. */
1081 if (warn_pointer_sign == -1)
1082 warn_pointer_sign = 0;
1084 if (warn_strict_aliasing == -1)
1085 warn_strict_aliasing = 0;
1086 if (warn_strict_overflow == -1)
1087 warn_strict_overflow = 0;
1089 /* -Woverlength-strings is off by default, but is enabled by -pedantic.
1090 It is never enabled in C++, as the minimum limit is not normative
1091 in that standard. */
1092 if (warn_overlength_strings == -1 || c_dialect_cxx ())
1093 warn_overlength_strings = 0;
1095 /* Wmain is enabled by default in C++ but not in C. */
1096 /* Wmain is disabled by default for -ffreestanding (!flag_hosted),
1097 even if -Wall was given (warn_main will be 2 if set by -Wall, 1
1098 if set by -Wmain). */
1099 if (warn_main == -1)
1100 warn_main = (c_dialect_cxx () && flag_hosted) ? 1 : 0;
1101 else if (warn_main == 2)
1102 warn_main = flag_hosted ? 1 : 0;
1104 /* In C, -Wconversion enables -Wsign-conversion (unless disabled
1105 through -Wno-sign-conversion). While in C++,
1106 -Wsign-conversion needs to be requested explicitly. */
1107 if (warn_sign_conversion == -1)
1108 warn_sign_conversion = (c_dialect_cxx ()) ? 0 : warn_conversion;
1110 /* In C, -Wall and -Wc++-compat enable -Wenum-compare, which we do
1111 in c_common_handle_option; if it has not yet been set, it is
1112 disabled by default. In C++, it is enabled by default. */
1113 if (warn_enum_compare == -1)
1114 warn_enum_compare = c_dialect_cxx () ? 1 : 0;
1116 /* -Wpacked-bitfield-compat is on by default for the C languages. The
1117 warning is issued in stor-layout.c which is not part of the front-end so
1118 we need to selectively turn it on here. */
1119 if (warn_packed_bitfield_compat == -1)
1120 warn_packed_bitfield_compat = 1;
1122 /* Special format checking options don't work without -Wformat; warn if
1126 warning (OPT_Wformat_y2k,
1127 "-Wformat-y2k ignored without -Wformat");
1128 warning (OPT_Wformat_extra_args,
1129 "-Wformat-extra-args ignored without -Wformat");
1130 warning (OPT_Wformat_zero_length,
1131 "-Wformat-zero-length ignored without -Wformat");
1132 warning (OPT_Wformat_nonliteral,
1133 "-Wformat-nonliteral ignored without -Wformat");
1134 warning (OPT_Wformat_contains_nul,
1135 "-Wformat-contains-nul ignored without -Wformat");
1136 warning (OPT_Wformat_security,
1137 "-Wformat-security ignored without -Wformat");
1140 /* -Wimplicit-function-declaration is enabled by default for C99. */
1141 if (warn_implicit_function_declaration == -1)
1142 warn_implicit_function_declaration = flag_isoc99;
1144 /* If we're allowing C++0x constructs, don't warn about C++0x
1145 compatibility problems. */
1146 if (cxx_dialect == cxx0x)
1147 warn_cxx0x_compat = 0;
1149 if (flag_preprocess_only)
1151 /* Open the output now. We must do so even if flag_no_output is
1152 on, because there may be other output than from the actual
1153 preprocessing (e.g. from -dM). */
1154 if (out_fname[0] == '\0')
1155 out_stream = stdout;
1157 out_stream = fopen (out_fname, "w");
1159 if (out_stream == NULL)
1161 fatal_error ("opening output file %s: %m", out_fname);
1165 if (num_in_fnames > 1)
1166 error ("too many filenames given. Type %s --help for usage",
1169 init_pp_output (out_stream);
1175 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1176 input_location = UNKNOWN_LOCATION;
1179 cb = cpp_get_callbacks (parse_in);
1180 cb->file_change = cb_file_change;
1181 cb->dir_change = cb_dir_change;
1182 cpp_post_options (parse_in);
1184 input_location = UNKNOWN_LOCATION;
1186 *pfilename = this_input_filename
1187 = cpp_read_main_file (parse_in, in_fnames[0]);
1188 /* Don't do any compilation or preprocessing if there is no input file. */
1189 if (this_input_filename == NULL)
1195 if (flag_working_directory
1196 && flag_preprocess_only && !flag_no_line_commands)
1197 pp_dir_change (parse_in, get_src_pwd ());
1199 return flag_preprocess_only;
1202 /* Front end initialization common to C, ObjC and C++. */
1204 c_common_init (void)
1206 /* Set up preprocessor arithmetic. Must be done after call to
1207 c_common_nodes_and_builtins for type nodes to be good. */
1208 cpp_opts->precision = TYPE_PRECISION (intmax_type_node);
1209 cpp_opts->char_precision = TYPE_PRECISION (char_type_node);
1210 cpp_opts->int_precision = TYPE_PRECISION (integer_type_node);
1211 cpp_opts->wchar_precision = TYPE_PRECISION (wchar_type_node);
1212 cpp_opts->unsigned_wchar = TYPE_UNSIGNED (wchar_type_node);
1213 cpp_opts->bytes_big_endian = BYTES_BIG_ENDIAN;
1215 /* This can't happen until after wchar_precision and bytes_big_endian
1217 cpp_init_iconv (parse_in);
1220 c_common_print_pch_checksum (stderr);
1222 /* Has to wait until now so that cpplib has its hash table. */
1225 if (flag_preprocess_only)
1228 preprocess_file (parse_in);
1235 /* Initialize the integrated preprocessor after debug output has been
1236 initialized; loop over each input file. */
1238 c_common_parse_file (int set_yydebug)
1246 warning(0, "The C parser does not support -dy, option ignored");
1250 "The Objective-C parser does not support -dy, option ignored");
1253 warning(0, "The C++ parser does not support -dy, option ignored");
1257 "The Objective-C++ parser does not support -dy, option ignored");
1266 /* Start the main input file, if the debug writer wants it. */
1267 if (debug_hooks->start_end_main_source_file)
1268 (*debug_hooks->start_source_file) (0, this_input_filename);
1275 /* And end the main input file, if the debug writer wants it */
1276 if (debug_hooks->start_end_main_source_file)
1277 (*debug_hooks->end_source_file) (0);
1278 if (++i >= num_in_fnames)
1280 cpp_undef_all (parse_in);
1281 cpp_clear_file_cache (parse_in);
1283 = cpp_read_main_file (parse_in, in_fnames[i]);
1284 /* If an input file is missing, abandon further compilation.
1285 cpplib has issued a diagnostic. */
1286 if (!this_input_filename)
1291 /* Common finish hook for the C, ObjC and C++ front ends. */
1293 c_common_finish (void)
1295 FILE *deps_stream = NULL;
1297 /* Don't write the deps file if there are errors. */
1298 if (cpp_opts->deps.style != DEPS_NONE && errorcount == 0)
1300 /* If -M or -MM was seen without -MF, default output to the
1303 deps_stream = out_stream;
1306 deps_stream = fopen (deps_file, deps_append ? "a": "w");
1308 fatal_error ("opening dependency file %s: %m", deps_file);
1312 /* For performance, avoid tearing down cpplib's internal structures
1313 with cpp_destroy (). */
1314 cpp_finish (parse_in, deps_stream);
1316 if (deps_stream && deps_stream != out_stream
1317 && (ferror (deps_stream) || fclose (deps_stream)))
1318 fatal_error ("closing dependency file %s: %m", deps_file);
1320 if (out_stream && (ferror (out_stream) || fclose (out_stream)))
1321 fatal_error ("when writing output to %s: %m", out_fname);
1324 /* Either of two environment variables can specify output of
1325 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1326 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1327 and DEPS_TARGET is the target to mention in the deps. They also
1328 result in dependency information being appended to the output file
1329 rather than overwriting it, and like Sun's compiler
1330 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1332 check_deps_environment_vars (void)
1336 GET_ENVIRONMENT (spec, "DEPENDENCIES_OUTPUT");
1338 cpp_opts->deps.style = DEPS_USER;
1341 GET_ENVIRONMENT (spec, "SUNPRO_DEPENDENCIES");
1344 cpp_opts->deps.style = DEPS_SYSTEM;
1345 cpp_opts->deps.ignore_main_file = true;
1351 /* Find the space before the DEPS_TARGET, if there is one. */
1352 char *s = strchr (spec, ' ');
1355 /* Let the caller perform MAKE quoting. */
1356 defer_opt (OPT_MT, s + 1);
1360 /* Command line -MF overrides environment variables and default. */
1369 /* Handle deferred command line switches. */
1371 handle_deferred_opts (void)
1376 /* Avoid allocating the deps buffer if we don't need it.
1377 (This flag may be true without there having been -MT or -MQ
1378 options, but we'll still need the deps buffer.) */
1382 deps = cpp_get_deps (parse_in);
1384 for (i = 0; i < deferred_count; i++)
1386 struct deferred_opt *opt = &deferred_opts[i];
1388 if (opt->code == OPT_MT || opt->code == OPT_MQ)
1389 deps_add_target (deps, opt->arg, opt->code == OPT_MQ);
1393 /* These settings are appropriate for GCC, but not necessarily so for
1394 cpplib as a library. */
1396 sanitize_cpp_opts (void)
1398 /* If we don't know what style of dependencies to output, complain
1399 if any other dependency switches have been given. */
1400 if (deps_seen && cpp_opts->deps.style == DEPS_NONE)
1401 error ("to generate dependencies you must specify either -M or -MM");
1403 /* -dM and dependencies suppress normal output; do it here so that
1404 the last -d[MDN] switch overrides earlier ones. */
1405 if (flag_dump_macros == 'M')
1408 /* By default, -fdirectives-only implies -dD. This allows subsequent phases
1409 to perform proper macro expansion. */
1410 if (cpp_opts->directives_only && !cpp_opts->preprocessed && !flag_dump_macros)
1411 flag_dump_macros = 'D';
1413 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1414 -dM since at least glibc relies on -M -dM to work. */
1415 /* Also, flag_no_output implies flag_no_line_commands, always. */
1418 if (flag_dump_macros != 'M')
1419 flag_dump_macros = 0;
1420 flag_dump_includes = 0;
1421 flag_no_line_commands = 1;
1423 else if (cpp_opts->deps.missing_files)
1424 error ("-MG may only be used with -M or -MM");
1426 cpp_opts->unsigned_char = !flag_signed_char;
1427 cpp_opts->stdc_0_in_system_headers = STDC_0_IN_SYSTEM_HEADERS;
1429 /* Wlong-long is disabled by default. It is enabled by:
1430 [-pedantic | -Wtraditional] -std=[gnu|c]++98 ; or
1431 [-pedantic | -Wtraditional] -std=non-c99 .
1433 Either -Wlong-long or -Wno-long-long override any other settings. */
1434 if (warn_long_long == -1)
1435 warn_long_long = ((pedantic || warn_traditional)
1436 && (c_dialect_cxx () ? cxx_dialect == cxx98 : !flag_isoc99));
1437 cpp_opts->warn_long_long = warn_long_long;
1439 /* Similarly with -Wno-variadic-macros. No check for c99 here, since
1440 this also turns off warnings about GCCs extension. */
1441 cpp_opts->warn_variadic_macros
1442 = warn_variadic_macros && (pedantic || warn_traditional);
1444 /* If we're generating preprocessor output, emit current directory
1445 if explicitly requested or if debugging information is enabled.
1446 ??? Maybe we should only do it for debugging formats that
1447 actually output the current directory? */
1448 if (flag_working_directory == -1)
1449 flag_working_directory = (debug_info_level != DINFO_LEVEL_NONE);
1451 if (cpp_opts->directives_only)
1453 if (warn_unused_macros)
1454 error ("-fdirectives-only is incompatible with -Wunused_macros");
1455 if (cpp_opts->traditional)
1456 error ("-fdirectives-only is incompatible with -traditional");
1460 /* Add include path with a prefix at the front of its name. */
1462 add_prefixed_path (const char *suffix, size_t chain)
1466 size_t prefix_len, suffix_len;
1468 suffix_len = strlen (suffix);
1469 prefix = iprefix ? iprefix : cpp_GCC_INCLUDE_DIR;
1470 prefix_len = iprefix ? strlen (iprefix) : cpp_GCC_INCLUDE_DIR_len;
1472 path = (char *) xmalloc (prefix_len + suffix_len + 1);
1473 memcpy (path, prefix, prefix_len);
1474 memcpy (path + prefix_len, suffix, suffix_len);
1475 path[prefix_len + suffix_len] = '\0';
1477 add_path (path, chain, 0, false);
1480 /* Handle -D, -U, -A, -imacros, and the first -include. */
1482 finish_options (void)
1484 if (!cpp_opts->preprocessed)
1488 cb_file_change (parse_in,
1489 linemap_add (line_table, LC_RENAME, 0,
1490 _("<built-in>"), 0));
1492 cpp_init_builtins (parse_in, flag_hosted);
1493 c_cpp_builtins (parse_in);
1495 /* We're about to send user input to cpplib, so make it warn for
1496 things that we previously (when we sent it internal definitions)
1497 told it to not warn.
1499 C99 permits implementation-defined characters in identifiers.
1500 The documented meaning of -std= is to turn off extensions that
1501 conflict with the specified standard, and since a strictly
1502 conforming program cannot contain a '$', we do not condition
1503 their acceptance on the -std= setting. */
1504 cpp_opts->warn_dollars = (cpp_opts->pedantic && !cpp_opts->c99);
1506 cb_file_change (parse_in,
1507 linemap_add (line_table, LC_RENAME, 0,
1508 _("<command-line>"), 0));
1510 for (i = 0; i < deferred_count; i++)
1512 struct deferred_opt *opt = &deferred_opts[i];
1514 if (opt->code == OPT_D)
1515 cpp_define (parse_in, opt->arg);
1516 else if (opt->code == OPT_U)
1517 cpp_undef (parse_in, opt->arg);
1518 else if (opt->code == OPT_A)
1520 if (opt->arg[0] == '-')
1521 cpp_unassert (parse_in, opt->arg + 1);
1523 cpp_assert (parse_in, opt->arg);
1527 /* Handle -imacros after -D and -U. */
1528 for (i = 0; i < deferred_count; i++)
1530 struct deferred_opt *opt = &deferred_opts[i];
1532 if (opt->code == OPT_imacros
1533 && cpp_push_include (parse_in, opt->arg))
1535 /* Disable push_command_line_include callback for now. */
1536 include_cursor = deferred_count + 1;
1537 cpp_scan_nooutput (parse_in);
1541 else if (cpp_opts->directives_only)
1542 cpp_init_special_builtins (parse_in);
1545 push_command_line_include ();
1548 /* Give CPP the next file given by -include, if any. */
1550 push_command_line_include (void)
1552 while (include_cursor < deferred_count)
1554 struct deferred_opt *opt = &deferred_opts[include_cursor++];
1556 if (!cpp_opts->preprocessed && opt->code == OPT_include
1557 && cpp_push_include (parse_in, opt->arg))
1561 if (include_cursor == deferred_count)
1564 /* -Wunused-macros should only warn about macros defined hereafter. */
1565 cpp_opts->warn_unused_macros = warn_unused_macros;
1566 /* Restore the line map from <command line>. */
1567 if (!cpp_opts->preprocessed)
1568 cpp_change_file (parse_in, LC_RENAME, this_input_filename);
1570 /* Set this here so the client can change the option if it wishes,
1571 and after stacking the main file so we don't trace the main file. */
1572 line_table->trace_includes = cpp_opts->print_include_names;
1576 /* File change callback. Has to handle -include files. */
1578 cb_file_change (cpp_reader * ARG_UNUSED (pfile),
1579 const struct line_map *new_map)
1581 if (flag_preprocess_only)
1582 pp_file_change (new_map);
1584 fe_file_change (new_map);
1586 if (new_map == 0 || (new_map->reason == LC_LEAVE && MAIN_FILE_P (new_map)))
1587 push_command_line_include ();
1591 cb_dir_change (cpp_reader * ARG_UNUSED (pfile), const char *dir)
1593 if (!set_src_pwd (dir))
1594 warning (0, "too late for # directive to set debug directory");
1597 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1598 extensions if ISO). There is no concept of gnu94. */
1600 set_std_c89 (int c94, int iso)
1602 cpp_set_lang (parse_in, c94 ? CLK_STDC94: iso ? CLK_STDC89: CLK_GNUC89);
1605 flag_no_gnu_keywords = iso;
1606 flag_no_nonansi_builtin = iso;
1611 /* Set the C 99 standard (without GNU extensions if ISO). */
1613 set_std_c99 (int iso)
1615 cpp_set_lang (parse_in, iso ? CLK_STDC99: CLK_GNUC99);
1617 flag_no_nonansi_builtin = iso;
1623 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1625 set_std_cxx98 (int iso)
1627 cpp_set_lang (parse_in, iso ? CLK_CXX98: CLK_GNUCXX);
1628 flag_no_gnu_keywords = iso;
1629 flag_no_nonansi_builtin = iso;
1631 cxx_dialect = cxx98;
1634 /* Set the C++ 0x working draft "standard" (without GNU extensions if ISO). */
1636 set_std_cxx0x (int iso)
1638 cpp_set_lang (parse_in, iso ? CLK_CXX0X: CLK_GNUCXX0X);
1639 flag_no_gnu_keywords = iso;
1640 flag_no_nonansi_builtin = iso;
1642 cxx_dialect = cxx0x;
1645 /* Handle setting implicit to ON. */
1647 set_Wimplicit (int on)
1650 warn_implicit_int = on;
1651 warn_implicit_function_declaration = on;
1654 /* Args to -d specify what to dump. Silently ignore
1655 unrecognized options; they may be aimed at toplev.c. */
1657 handle_OPT_d (const char *arg)
1661 while ((c = *arg++) != '\0')
1664 case 'M': /* Dump macros only. */
1665 case 'N': /* Dump names. */
1666 case 'D': /* Dump definitions. */
1667 case 'U': /* Dump used macros. */
1668 flag_dump_macros = c;
1672 flag_dump_includes = 1;