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 "c-tree.h" /* For c_cpp_error. */
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 /* Complain that switch CODE expects an argument but none was
139 provided. OPT was the command-line option. Return FALSE to get
140 the default message in opts.c, TRUE if we provide a specialized
143 c_common_missing_argument (const char *opt, size_t code)
148 /* Pick up the default message. */
151 case OPT_fconstant_string_class_:
152 error ("no class name specified with %qs", opt);
156 error ("assertion missing after %qs", opt);
161 error ("macro name missing after %qs", opt);
170 error ("missing path after %qs", opt);
179 error ("missing filename after %qs", opt);
184 error ("missing makefile target after %qs", opt);
191 /* Defer option CODE with argument ARG. */
193 defer_opt (enum opt_code code, const char *arg)
195 deferred_opts[deferred_count].code = code;
196 deferred_opts[deferred_count].arg = arg;
200 /* -Werror= may set a warning option to enable a warning that is emitted
201 by the preprocessor. Set any corresponding flag in cpp_opts. */
204 warning_as_error_callback (int option_index)
206 switch (option_index)
209 /* Ignore options not associated with the preprocessor. */
212 case OPT_Wdeprecated:
213 cpp_opts->warn_deprecated = 1;
218 cpp_opts->warn_comments = 1;
222 cpp_opts->warn_trigraphs = 1;
226 cpp_opts->warn_multichar = 1;
229 case OPT_Wtraditional:
230 cpp_opts->warn_traditional = 1;
234 cpp_opts->warn_long_long = 1;
237 case OPT_Wendif_labels:
238 cpp_opts->warn_endif_labels = 1;
241 case OPT_Wvariadic_macros:
242 /* Set the local flag that is used later to update cpp_opts. */
243 warn_variadic_macros = 1;
246 case OPT_Wbuiltin_macro_redefined:
247 cpp_opts->warn_builtin_macro_redefined = 1;
251 cpp_opts->warn_undef = 1;
254 case OPT_Wunused_macros:
255 /* Set the local flag that is used later to update cpp_opts. */
256 warn_unused_macros = 1;
259 case OPT_Wc___compat:
260 /* Add warnings in the same way as c_common_handle_option below. */
261 if (warn_enum_compare == -1)
262 warn_enum_compare = 1;
263 if (warn_jump_misses_init == -1)
264 warn_jump_misses_init = 1;
265 cpp_opts->warn_cxx_operator_names = 1;
268 case OPT_Wnormalized_:
269 inform (input_location, "-Werror=normalized=: Set -Wnormalized=nfc");
270 cpp_opts->warn_normalize = normalized_C;
273 case OPT_Winvalid_pch:
274 cpp_opts->warn_invalid_pch = 1;
278 /* Handled by standard diagnostics using the option's associated
284 /* Common initialization before parsing options. */
286 c_common_init_options (unsigned int argc, const char **argv)
288 static const unsigned int lang_flags[] = {CL_C, CL_ObjC, CL_CXX, CL_ObjCXX};
289 unsigned int i, result;
290 struct cpp_callbacks *cb;
292 /* Register callback for warnings enabled by -Werror=. */
293 register_warning_as_error_callback (warning_as_error_callback);
295 /* This is conditionalized only because that is the way the front
296 ends used to do it. Maybe this should be unconditional? */
297 if (c_dialect_cxx ())
299 /* By default wrap lines at 80 characters. Is getenv
300 ("COLUMNS") preferable? */
301 diagnostic_line_cutoff (global_dc) = 80;
302 /* By default, emit location information once for every
303 diagnostic message. */
304 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
307 parse_in = cpp_create_reader (c_dialect_cxx () ? CLK_GNUCXX: CLK_GNUC89,
308 ident_hash, line_table);
309 cb = cpp_get_callbacks (parse_in);
310 cb->error = c_cpp_error;
312 cpp_opts = cpp_get_options (parse_in);
313 cpp_opts->dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
314 cpp_opts->objc = c_dialect_objc ();
316 /* Reset to avoid warnings on internal definitions. We set it just
317 before passing on command-line options to cpplib. */
318 cpp_opts->warn_dollars = 0;
320 flag_exceptions = c_dialect_cxx ();
321 warn_pointer_arith = c_dialect_cxx ();
322 warn_write_strings = c_dialect_cxx();
323 flag_warn_unused_result = true;
325 /* By default, C99-like requirements for complex multiply and divide. */
326 flag_complex_method = 2;
328 deferred_opts = XNEWVEC (struct deferred_opt, argc);
330 result = lang_flags[c_language];
332 if (c_language == clk_c)
334 /* If preprocessing assembly language, accept any of the C-family
335 front end options since the driver may pass them through. */
336 for (i = 1; i < argc; i++)
337 if (! strcmp (argv[i], "-lang-asm"))
339 result |= CL_C | CL_ObjC | CL_CXX | CL_ObjCXX;
347 /* Handle switch SCODE with argument ARG. VALUE is true, unless no-
348 form of an -f or -W option was given. Returns 0 if the switch was
349 invalid, a negative number to prevent language-independent
350 processing in toplev.c (a hack necessary for the short-term). */
352 c_common_handle_option (size_t scode, const char *arg, int value,
355 const struct cl_option *option = &cl_options[scode];
356 enum opt_code code = (enum opt_code) scode;
359 /* Prevent resetting the language standard to a C dialect when the driver
360 has already determined that we're looking at assembler input. */
361 bool preprocessing_asm_p = (cpp_get_options (parse_in)->lang == CLK_ASM);
366 if (cl_options[code].flags & c_family_lang_mask)
368 if ((option->flags & CL_TARGET)
369 && ! targetcm.handle_c_option (scode, arg, value))
376 case OPT__output_pch_:
381 defer_opt (code, arg);
385 cpp_opts->discard_comments = 0;
389 cpp_opts->discard_comments = 0;
390 cpp_opts->discard_comments_in_macro_exp = 0;
394 defer_opt (code, arg);
398 flag_preprocess_only = 1;
402 cpp_opts->print_include_names = 1;
406 TARGET_OPTF (xstrdup (arg));
410 if (strcmp (arg, "-"))
411 add_path (xstrdup (arg), BRACKET, 0, true);
414 if (quote_chain_split)
415 error ("-I- specified twice");
416 quote_chain_split = true;
417 split_quote_chain ();
418 inform (input_location, "obsolete option -I- used, please use -iquote instead");
424 /* When doing dependencies with -M or -MM, suppress normal
425 preprocessed output, but still do -dM etc. as software
426 depends on this. Preprocessed output does occur if -MD, -MMD
427 or environment var dependency generation is used. */
428 cpp_opts->deps.style = (code == OPT_M ? DEPS_SYSTEM: DEPS_USER);
434 cpp_opts->deps.style = (code == OPT_MD ? DEPS_SYSTEM: DEPS_USER);
435 cpp_opts->deps.need_preprocessor_output = true;
446 cpp_opts->deps.missing_files = true;
451 cpp_opts->deps.phony_targets = true;
457 defer_opt (code, arg);
461 flag_no_line_commands = 1;
464 case OPT_fworking_directory:
465 flag_working_directory = value;
469 defer_opt (code, arg);
475 handle_option (OPT_Wimplicit, value, NULL, c_family_lang_mask, kind);
476 warn_char_subscripts = value;
477 warn_missing_braces = value;
478 warn_parentheses = value;
479 warn_return_type = value;
480 warn_sequence_point = value; /* Was C only. */
482 if (warn_strict_aliasing == -1)
483 set_Wstrict_aliasing (value);
484 warn_address = value;
485 if (warn_strict_overflow == -1)
486 warn_strict_overflow = value;
487 warn_array_bounds = value;
488 warn_volatile_register_var = value;
490 /* Only warn about unknown pragmas that are not in system
492 warn_unknown_pragmas = value;
494 warn_uninitialized = value;
496 if (!c_dialect_cxx ())
498 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding
499 can turn it off only if it's not explicit. */
501 warn_main = (value ? 2 : 0);
503 /* In C, -Wall turns on -Wenum-compare, which we do here.
504 In C++ it is on by default, which is done in
505 c_common_post_options. */
506 if (warn_enum_compare == -1)
507 warn_enum_compare = value;
511 /* C++-specific warnings. */
512 warn_sign_compare = value;
513 warn_reorder = value;
514 warn_cxx0x_compat = value;
517 cpp_opts->warn_trigraphs = value;
518 cpp_opts->warn_comments = value;
519 cpp_opts->warn_num_sign_change = value;
521 if (warn_pointer_sign == -1)
522 warn_pointer_sign = value;
525 case OPT_Wbuiltin_macro_redefined:
526 cpp_opts->warn_builtin_macro_redefined = value;
531 cpp_opts->warn_comments = value;
534 case OPT_Wc___compat:
535 /* Because -Wenum-compare is the default in C++, -Wc++-compat
536 implies -Wenum-compare. */
537 if (warn_enum_compare == -1 && value)
538 warn_enum_compare = value;
539 /* Because C++ always warns about a goto which misses an
540 initialization, -Wc++-compat turns on -Wjump-misses-init. */
541 if (warn_jump_misses_init == -1 && value)
542 warn_jump_misses_init = value;
543 cpp_opts->warn_cxx_operator_names = value;
546 case OPT_Wdeprecated:
547 cpp_opts->warn_deprecated = value;
550 case OPT_Wendif_labels:
551 cpp_opts->warn_endif_labels = value;
555 global_dc->warning_as_error_requested = value;
558 case OPT_Werror_implicit_function_declaration:
559 /* For backward compatibility, this is the same as
560 -Werror=implicit-function-declaration. */
561 enable_warning_as_error ("implicit-function-declaration", value, CL_C | CL_ObjC);
569 set_Wformat (atoi (arg));
573 gcc_assert (value == 0 || value == 1);
574 if (warn_implicit_int == -1)
575 handle_option (OPT_Wimplicit_int, value, NULL,
576 c_family_lang_mask, kind);
577 if (warn_implicit_function_declaration == -1)
578 handle_option (OPT_Wimplicit_function_declaration, value, NULL,
579 c_family_lang_mask, kind);
583 /* Silently ignore for now. */
586 case OPT_Winvalid_pch:
587 cpp_opts->warn_invalid_pch = value;
590 case OPT_Wmissing_include_dirs:
591 cpp_opts->warn_missing_include_dirs = value;
595 cpp_opts->warn_multichar = value;
598 case OPT_Wnormalized_:
599 if (!value || (arg && strcasecmp (arg, "none") == 0))
600 cpp_opts->warn_normalize = normalized_none;
601 else if (!arg || strcasecmp (arg, "nfkc") == 0)
602 cpp_opts->warn_normalize = normalized_KC;
603 else if (strcasecmp (arg, "id") == 0)
604 cpp_opts->warn_normalize = normalized_identifier_C;
605 else if (strcasecmp (arg, "nfc") == 0)
606 cpp_opts->warn_normalize = normalized_C;
608 error ("argument %qs to %<-Wnormalized%> not recognized", arg);
611 case OPT_Wreturn_type:
612 warn_return_type = value;
615 case OPT_Wstrict_null_sentinel:
616 warn_strict_null_sentinel = value;
619 case OPT_Wtraditional:
620 cpp_opts->warn_traditional = value;
624 cpp_opts->warn_trigraphs = value;
628 cpp_opts->warn_undef = value;
631 case OPT_Wunknown_pragmas:
632 /* Set to greater than 1, so that even unknown pragmas in
633 system headers will be warned about. */
634 warn_unknown_pragmas = value * 2;
637 case OPT_Wunused_macros:
638 warn_unused_macros = value;
641 case OPT_Wvariadic_macros:
642 warn_variadic_macros = value;
645 case OPT_Wwrite_strings:
646 warn_write_strings = value;
652 warn_nonvdtor = true;
656 if (!c_dialect_cxx ())
657 set_std_c89 (false, true);
659 set_std_cxx98 (true);
666 case OPT_fcond_mismatch:
667 if (!c_dialect_cxx ())
669 flag_cond_mismatch = value;
674 case OPT_fall_virtual:
675 case OPT_falt_external_templates:
676 case OPT_fenum_int_equiv:
677 case OPT_fexternal_templates:
678 case OPT_fguiding_decls:
680 case OPT_fhuge_objects:
682 case OPT_fname_mangling_version_:
684 case OPT_fnonnull_objects:
686 case OPT_fstrict_prototype:
687 case OPT_fthis_is_variable:
688 case OPT_fvtable_thunks:
691 warning (0, "switch %qs is no longer supported", option->opt_text);
694 case OPT_faccess_control:
695 flag_access_control = value;
699 flag_no_asm = !value;
703 flag_no_builtin = !value;
710 disable_builtin_function (arg);
713 case OPT_fdirectives_only:
714 cpp_opts->directives_only = value;
717 case OPT_fdollars_in_identifiers:
718 cpp_opts->dollars_in_ident = value;
721 case OPT_ffreestanding:
723 /* Fall through.... */
726 flag_no_builtin = !value;
729 case OPT_fshort_double:
730 flag_short_double = value;
733 case OPT_fshort_enums:
734 flag_short_enums = value;
737 case OPT_fshort_wchar:
738 flag_short_wchar = value;
741 case OPT_fsigned_bitfields:
742 flag_signed_bitfields = value;
745 case OPT_fsigned_char:
746 flag_signed_char = value;
749 case OPT_funsigned_bitfields:
750 flag_signed_bitfields = !value;
753 case OPT_funsigned_char:
754 flag_signed_char = !value;
758 flag_check_new = value;
761 case OPT_fconserve_space:
762 flag_conserve_space = value;
765 case OPT_fconstant_string_class_:
766 constant_string_class_name = arg;
769 case OPT_fdefault_inline:
770 flag_default_inline = value;
773 case OPT_felide_constructors:
774 flag_elide_constructors = value;
777 case OPT_fenforce_eh_specs:
778 flag_enforce_eh_specs = value;
781 case OPT_fextended_identifiers:
782 cpp_opts->extended_identifiers = value;
786 flag_new_for_scope = value;
789 case OPT_fgnu_keywords:
790 flag_no_gnu_keywords = !value;
793 case OPT_fgnu_runtime:
794 flag_next_runtime = !value;
797 case OPT_fhandle_exceptions:
798 warning (0, "-fhandle-exceptions has been renamed -fexceptions (and is now on by default)");
799 flag_exceptions = value;
802 case OPT_fimplement_inlines:
803 flag_implement_inlines = value;
806 case OPT_fimplicit_inline_templates:
807 flag_implicit_inline_templates = value;
810 case OPT_fimplicit_templates:
811 flag_implicit_templates = value;
814 case OPT_flax_vector_conversions:
815 flag_lax_vector_conversions = value;
818 case OPT_fms_extensions:
819 flag_ms_extensions = value;
822 case OPT_fnext_runtime:
823 flag_next_runtime = value;
826 case OPT_fnil_receivers:
827 flag_nil_receivers = value;
830 case OPT_fnonansi_builtins:
831 flag_no_nonansi_builtin = !value;
834 case OPT_foperator_names:
835 cpp_opts->operator_names = value;
838 case OPT_foptional_diags:
839 flag_optional_diags = value;
843 cpp_opts->restore_pch_deps = value;
846 case OPT_fpch_preprocess:
847 flag_pch_preprocess = value;
850 case OPT_fpermissive:
851 flag_permissive = value;
854 case OPT_fpreprocessed:
855 cpp_opts->preprocessed = value;
858 case OPT_freplace_objc_classes:
859 flag_replace_objc_classes = value;
863 flag_use_repository = value;
865 flag_implicit_templates = 0;
872 case OPT_fshow_column:
873 cpp_opts->show_column = value;
877 flag_detailed_statistics = value;
881 /* It is documented that we silently ignore silly values. */
882 if (value >= 1 && value <= 100)
883 cpp_opts->tabstop = value;
886 case OPT_fexec_charset_:
887 cpp_opts->narrow_charset = arg;
890 case OPT_fwide_exec_charset_:
891 cpp_opts->wide_charset = arg;
894 case OPT_finput_charset_:
895 cpp_opts->input_charset = arg;
898 case OPT_ftemplate_depth_:
899 /* Kept for backwards compatibility. */
900 case OPT_ftemplate_depth_eq:
901 max_tinst_depth = value;
904 case OPT_fuse_cxa_atexit:
905 flag_use_cxa_atexit = value;
908 case OPT_fuse_cxa_get_exception_ptr:
909 flag_use_cxa_get_exception_ptr = value;
912 case OPT_fvisibility_inlines_hidden:
913 visibility_options.inlines_hidden = value;
920 case OPT_fthreadsafe_statics:
921 flag_threadsafe_statics = value;
924 case OPT_fpretty_templates:
925 flag_pretty_templates = value;
929 flag_zero_link = value;
933 flag_gen_declaration = 1;
936 case OPT_femit_struct_debug_baseonly:
937 set_struct_debug_option ("base");
940 case OPT_femit_struct_debug_reduced:
941 set_struct_debug_option ("dir:ord:sys,dir:gen:any,ind:base");
944 case OPT_femit_struct_debug_detailed_:
945 set_struct_debug_option (arg);
949 add_path (xstrdup (arg), AFTER, 0, true);
954 defer_opt (code, arg);
966 add_path (xstrdup (arg), QUOTE, 0, true);
974 add_path (xstrdup (arg), SYSTEM, 0, true);
977 case OPT_iwithprefix:
978 add_prefixed_path (arg, SYSTEM);
981 case OPT_iwithprefixbefore:
982 add_prefixed_path (arg, BRACKET);
986 cpp_set_lang (parse_in, CLK_ASM);
987 cpp_opts->dollars_in_ident = false;
1006 error ("output filename specified twice");
1009 /* We need to handle the -pedantic switches here, rather than in
1010 c_common_post_options, so that a subsequent -Wno-endif-labels
1011 is not overridden. */
1012 case OPT_pedantic_errors:
1014 cpp_opts->pedantic = 1;
1015 cpp_opts->warn_endif_labels = 1;
1016 if (warn_pointer_sign == -1)
1017 warn_pointer_sign = 1;
1018 if (warn_overlength_strings == -1)
1019 warn_overlength_strings = 1;
1020 if (warn_main == -1)
1024 case OPT_print_objc_runtime_info:
1025 print_struct_values = 1;
1028 case OPT_print_pch_checksum:
1029 c_common_print_pch_checksum (stdout);
1030 exit_after_options = true;
1034 cpp_opts->remap = 1;
1038 case OPT_std_gnu__98:
1039 if (!preprocessing_asm_p)
1040 set_std_cxx98 (code == OPT_std_c__98 /* ISO */);
1044 case OPT_std_gnu__0x:
1045 if (!preprocessing_asm_p)
1046 set_std_cxx0x (code == OPT_std_c__0x /* ISO */);
1051 case OPT_std_iso9899_1990:
1052 case OPT_std_iso9899_199409:
1053 if (!preprocessing_asm_p)
1054 set_std_c89 (code == OPT_std_iso9899_199409 /* c94 */, true /* ISO */);
1059 if (!preprocessing_asm_p)
1060 set_std_c89 (false /* c94 */, false /* ISO */);
1065 case OPT_std_iso9899_1999:
1066 case OPT_std_iso9899_199x:
1067 if (!preprocessing_asm_p)
1068 set_std_c99 (true /* ISO */);
1073 if (!preprocessing_asm_p)
1074 set_std_c99 (false /* ISO */);
1078 if (!preprocessing_asm_p)
1079 set_std_c1x (true /* ISO */);
1083 if (!preprocessing_asm_p)
1084 set_std_c1x (false /* ISO */);
1088 cpp_opts->trigraphs = 1;
1091 case OPT_traditional_cpp:
1092 cpp_opts->traditional = 1;
1111 /* Post-switch processing. */
1113 c_common_post_options (const char **pfilename)
1115 struct cpp_callbacks *cb;
1117 /* Canonicalize the input and output filenames. */
1118 if (in_fnames == NULL)
1120 in_fnames = XNEWVEC (const char *, 1);
1123 else if (strcmp (in_fnames[0], "-") == 0)
1126 if (out_fname == NULL || !strcmp (out_fname, "-"))
1129 if (cpp_opts->deps.style == DEPS_NONE)
1130 check_deps_environment_vars ();
1132 handle_deferred_opts ();
1134 sanitize_cpp_opts ();
1136 register_include_chains (parse_in, sysroot, iprefix, imultilib,
1137 std_inc, std_cxx_inc && c_dialect_cxx (), verbose);
1139 #ifdef C_COMMON_OVERRIDE_OPTIONS
1140 /* Some machines may reject certain combinations of C
1141 language-specific options. */
1142 C_COMMON_OVERRIDE_OPTIONS;
1145 /* Excess precision other than "fast" requires front-end
1147 if (c_dialect_cxx ())
1149 if (flag_excess_precision_cmdline == EXCESS_PRECISION_STANDARD
1150 && TARGET_FLT_EVAL_METHOD_NON_DEFAULT)
1151 sorry ("-fexcess-precision=standard for C++");
1152 flag_excess_precision_cmdline = EXCESS_PRECISION_FAST;
1154 else if (flag_excess_precision_cmdline == EXCESS_PRECISION_DEFAULT)
1155 flag_excess_precision_cmdline = (flag_iso
1156 ? EXCESS_PRECISION_STANDARD
1157 : EXCESS_PRECISION_FAST);
1159 /* By default we use C99 inline semantics in GNU99 or C99 mode. C99
1160 inline semantics are not supported in GNU89 or C89 mode. */
1161 if (flag_gnu89_inline == -1)
1162 flag_gnu89_inline = !flag_isoc99;
1163 else if (!flag_gnu89_inline && !flag_isoc99)
1164 error ("-fno-gnu89-inline is only supported in GNU99 or C99 mode");
1166 /* Default to ObjC sjlj exception handling if NeXT runtime. */
1167 if (flag_objc_sjlj_exceptions < 0)
1168 flag_objc_sjlj_exceptions = flag_next_runtime;
1169 if (flag_objc_exceptions && !flag_objc_sjlj_exceptions)
1170 flag_exceptions = 1;
1172 /* -Wextra implies the following flags
1173 unless explicitly overridden. */
1174 if (warn_type_limits == -1)
1175 warn_type_limits = extra_warnings;
1176 if (warn_clobbered == -1)
1177 warn_clobbered = extra_warnings;
1178 if (warn_empty_body == -1)
1179 warn_empty_body = extra_warnings;
1180 if (warn_sign_compare == -1)
1181 warn_sign_compare = extra_warnings;
1182 if (warn_missing_field_initializers == -1)
1183 warn_missing_field_initializers = extra_warnings;
1184 if (warn_missing_parameter_type == -1)
1185 warn_missing_parameter_type = extra_warnings;
1186 if (warn_old_style_declaration == -1)
1187 warn_old_style_declaration = extra_warnings;
1188 if (warn_override_init == -1)
1189 warn_override_init = extra_warnings;
1190 if (warn_ignored_qualifiers == -1)
1191 warn_ignored_qualifiers = extra_warnings;
1193 /* -Wpointer-sign is disabled by default, but it is enabled if any
1194 of -Wall or -pedantic are given. */
1195 if (warn_pointer_sign == -1)
1196 warn_pointer_sign = 0;
1198 if (warn_strict_aliasing == -1)
1199 warn_strict_aliasing = 0;
1200 if (warn_strict_overflow == -1)
1201 warn_strict_overflow = 0;
1202 if (warn_jump_misses_init == -1)
1203 warn_jump_misses_init = 0;
1205 /* -Woverlength-strings is off by default, but is enabled by -pedantic.
1206 It is never enabled in C++, as the minimum limit is not normative
1207 in that standard. */
1208 if (warn_overlength_strings == -1 || c_dialect_cxx ())
1209 warn_overlength_strings = 0;
1211 /* Wmain is enabled by default in C++ but not in C. */
1212 /* Wmain is disabled by default for -ffreestanding (!flag_hosted),
1213 even if -Wall was given (warn_main will be 2 if set by -Wall, 1
1214 if set by -Wmain). */
1215 if (warn_main == -1)
1216 warn_main = (c_dialect_cxx () && flag_hosted) ? 1 : 0;
1217 else if (warn_main == 2)
1218 warn_main = flag_hosted ? 1 : 0;
1220 /* In C, -Wconversion enables -Wsign-conversion (unless disabled
1221 through -Wno-sign-conversion). While in C++,
1222 -Wsign-conversion needs to be requested explicitly. */
1223 if (warn_sign_conversion == -1)
1224 warn_sign_conversion = (c_dialect_cxx ()) ? 0 : warn_conversion;
1226 /* In C, -Wall and -Wc++-compat enable -Wenum-compare, which we do
1227 in c_common_handle_option; if it has not yet been set, it is
1228 disabled by default. In C++, it is enabled by default. */
1229 if (warn_enum_compare == -1)
1230 warn_enum_compare = c_dialect_cxx () ? 1 : 0;
1232 /* -Wpacked-bitfield-compat is on by default for the C languages. The
1233 warning is issued in stor-layout.c which is not part of the front-end so
1234 we need to selectively turn it on here. */
1235 if (warn_packed_bitfield_compat == -1)
1236 warn_packed_bitfield_compat = 1;
1238 /* Special format checking options don't work without -Wformat; warn if
1242 warning (OPT_Wformat_y2k,
1243 "-Wformat-y2k ignored without -Wformat");
1244 warning (OPT_Wformat_extra_args,
1245 "-Wformat-extra-args ignored without -Wformat");
1246 warning (OPT_Wformat_zero_length,
1247 "-Wformat-zero-length ignored without -Wformat");
1248 warning (OPT_Wformat_nonliteral,
1249 "-Wformat-nonliteral ignored without -Wformat");
1250 warning (OPT_Wformat_contains_nul,
1251 "-Wformat-contains-nul ignored without -Wformat");
1252 warning (OPT_Wformat_security,
1253 "-Wformat-security ignored without -Wformat");
1256 if (warn_implicit == -1)
1259 if (warn_implicit_int == -1)
1260 warn_implicit_int = 0;
1262 /* -Wimplicit-function-declaration is enabled by default for C99. */
1263 if (warn_implicit_function_declaration == -1)
1264 warn_implicit_function_declaration = flag_isoc99;
1266 /* If we're allowing C++0x constructs, don't warn about C++0x
1267 compatibility problems. */
1268 if (cxx_dialect == cxx0x)
1269 warn_cxx0x_compat = 0;
1271 if (flag_preprocess_only)
1273 /* Open the output now. We must do so even if flag_no_output is
1274 on, because there may be other output than from the actual
1275 preprocessing (e.g. from -dM). */
1276 if (out_fname[0] == '\0')
1277 out_stream = stdout;
1279 out_stream = fopen (out_fname, "w");
1281 if (out_stream == NULL)
1283 fatal_error ("opening output file %s: %m", out_fname);
1287 if (num_in_fnames > 1)
1288 error ("too many filenames given. Type %s --help for usage",
1291 init_pp_output (out_stream);
1297 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1298 input_location = UNKNOWN_LOCATION;
1301 cb = cpp_get_callbacks (parse_in);
1302 cb->file_change = cb_file_change;
1303 cb->dir_change = cb_dir_change;
1304 cpp_post_options (parse_in);
1306 input_location = UNKNOWN_LOCATION;
1308 *pfilename = this_input_filename
1309 = cpp_read_main_file (parse_in, in_fnames[0]);
1310 /* Don't do any compilation or preprocessing if there is no input file. */
1311 if (this_input_filename == NULL)
1317 if (flag_working_directory
1318 && flag_preprocess_only && !flag_no_line_commands)
1319 pp_dir_change (parse_in, get_src_pwd ());
1321 return flag_preprocess_only;
1324 /* Front end initialization common to C, ObjC and C++. */
1326 c_common_init (void)
1328 /* Set up preprocessor arithmetic. Must be done after call to
1329 c_common_nodes_and_builtins for type nodes to be good. */
1330 cpp_opts->precision = TYPE_PRECISION (intmax_type_node);
1331 cpp_opts->char_precision = TYPE_PRECISION (char_type_node);
1332 cpp_opts->int_precision = TYPE_PRECISION (integer_type_node);
1333 cpp_opts->wchar_precision = TYPE_PRECISION (wchar_type_node);
1334 cpp_opts->unsigned_wchar = TYPE_UNSIGNED (wchar_type_node);
1335 cpp_opts->bytes_big_endian = BYTES_BIG_ENDIAN;
1337 /* This can't happen until after wchar_precision and bytes_big_endian
1339 cpp_init_iconv (parse_in);
1342 c_common_print_pch_checksum (stderr);
1344 /* Has to wait until now so that cpplib has its hash table. */
1347 if (flag_preprocess_only)
1350 preprocess_file (parse_in);
1357 /* Initialize the integrated preprocessor after debug output has been
1358 initialized; loop over each input file. */
1360 c_common_parse_file (int set_yydebug)
1368 warning(0, "The C parser does not support -dy, option ignored");
1372 "The Objective-C parser does not support -dy, option ignored");
1375 warning(0, "The C++ parser does not support -dy, option ignored");
1379 "The Objective-C++ parser does not support -dy, option ignored");
1394 /* And end the main input file, if the debug writer wants it */
1395 if (debug_hooks->start_end_main_source_file)
1396 (*debug_hooks->end_source_file) (0);
1397 if (++i >= num_in_fnames)
1399 cpp_undef_all (parse_in);
1400 cpp_clear_file_cache (parse_in);
1402 = cpp_read_main_file (parse_in, in_fnames[i]);
1403 /* If an input file is missing, abandon further compilation.
1404 cpplib has issued a diagnostic. */
1405 if (!this_input_filename)
1410 /* Common finish hook for the C, ObjC and C++ front ends. */
1412 c_common_finish (void)
1414 FILE *deps_stream = NULL;
1416 /* Don't write the deps file if there are errors. */
1417 if (cpp_opts->deps.style != DEPS_NONE && errorcount == 0)
1419 /* If -M or -MM was seen without -MF, default output to the
1422 deps_stream = out_stream;
1425 deps_stream = fopen (deps_file, deps_append ? "a": "w");
1427 fatal_error ("opening dependency file %s: %m", deps_file);
1431 /* For performance, avoid tearing down cpplib's internal structures
1432 with cpp_destroy (). */
1433 cpp_finish (parse_in, deps_stream);
1435 if (deps_stream && deps_stream != out_stream
1436 && (ferror (deps_stream) || fclose (deps_stream)))
1437 fatal_error ("closing dependency file %s: %m", deps_file);
1439 if (out_stream && (ferror (out_stream) || fclose (out_stream)))
1440 fatal_error ("when writing output to %s: %m", out_fname);
1443 /* Either of two environment variables can specify output of
1444 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1445 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1446 and DEPS_TARGET is the target to mention in the deps. They also
1447 result in dependency information being appended to the output file
1448 rather than overwriting it, and like Sun's compiler
1449 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1451 check_deps_environment_vars (void)
1455 GET_ENVIRONMENT (spec, "DEPENDENCIES_OUTPUT");
1457 cpp_opts->deps.style = DEPS_USER;
1460 GET_ENVIRONMENT (spec, "SUNPRO_DEPENDENCIES");
1463 cpp_opts->deps.style = DEPS_SYSTEM;
1464 cpp_opts->deps.ignore_main_file = true;
1470 /* Find the space before the DEPS_TARGET, if there is one. */
1471 char *s = strchr (spec, ' ');
1474 /* Let the caller perform MAKE quoting. */
1475 defer_opt (OPT_MT, s + 1);
1479 /* Command line -MF overrides environment variables and default. */
1488 /* Handle deferred command line switches. */
1490 handle_deferred_opts (void)
1495 /* Avoid allocating the deps buffer if we don't need it.
1496 (This flag may be true without there having been -MT or -MQ
1497 options, but we'll still need the deps buffer.) */
1501 deps = cpp_get_deps (parse_in);
1503 for (i = 0; i < deferred_count; i++)
1505 struct deferred_opt *opt = &deferred_opts[i];
1507 if (opt->code == OPT_MT || opt->code == OPT_MQ)
1508 deps_add_target (deps, opt->arg, opt->code == OPT_MQ);
1512 /* These settings are appropriate for GCC, but not necessarily so for
1513 cpplib as a library. */
1515 sanitize_cpp_opts (void)
1517 /* If we don't know what style of dependencies to output, complain
1518 if any other dependency switches have been given. */
1519 if (deps_seen && cpp_opts->deps.style == DEPS_NONE)
1520 error ("to generate dependencies you must specify either -M or -MM");
1522 /* -dM and dependencies suppress normal output; do it here so that
1523 the last -d[MDN] switch overrides earlier ones. */
1524 if (flag_dump_macros == 'M')
1527 /* By default, -fdirectives-only implies -dD. This allows subsequent phases
1528 to perform proper macro expansion. */
1529 if (cpp_opts->directives_only && !cpp_opts->preprocessed && !flag_dump_macros)
1530 flag_dump_macros = 'D';
1532 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1533 -dM since at least glibc relies on -M -dM to work. */
1534 /* Also, flag_no_output implies flag_no_line_commands, always. */
1537 if (flag_dump_macros != 'M')
1538 flag_dump_macros = 0;
1539 flag_dump_includes = 0;
1540 flag_no_line_commands = 1;
1542 else if (cpp_opts->deps.missing_files)
1543 error ("-MG may only be used with -M or -MM");
1545 cpp_opts->unsigned_char = !flag_signed_char;
1546 cpp_opts->stdc_0_in_system_headers = STDC_0_IN_SYSTEM_HEADERS;
1548 /* Wlong-long is disabled by default. It is enabled by:
1549 [-pedantic | -Wtraditional] -std=[gnu|c]++98 ; or
1550 [-pedantic | -Wtraditional] -std=non-c99 .
1552 Either -Wlong-long or -Wno-long-long override any other settings. */
1553 if (warn_long_long == -1)
1554 warn_long_long = ((pedantic || warn_traditional)
1555 && (c_dialect_cxx () ? cxx_dialect == cxx98 : !flag_isoc99));
1556 cpp_opts->warn_long_long = warn_long_long;
1558 /* Similarly with -Wno-variadic-macros. No check for c99 here, since
1559 this also turns off warnings about GCCs extension. */
1560 cpp_opts->warn_variadic_macros
1561 = warn_variadic_macros && (pedantic || warn_traditional);
1563 /* If we're generating preprocessor output, emit current directory
1564 if explicitly requested or if debugging information is enabled.
1565 ??? Maybe we should only do it for debugging formats that
1566 actually output the current directory? */
1567 if (flag_working_directory == -1)
1568 flag_working_directory = (debug_info_level != DINFO_LEVEL_NONE);
1570 if (cpp_opts->directives_only)
1572 if (warn_unused_macros)
1573 error ("-fdirectives-only is incompatible with -Wunused_macros");
1574 if (cpp_opts->traditional)
1575 error ("-fdirectives-only is incompatible with -traditional");
1579 /* Add include path with a prefix at the front of its name. */
1581 add_prefixed_path (const char *suffix, size_t chain)
1585 size_t prefix_len, suffix_len;
1587 suffix_len = strlen (suffix);
1588 prefix = iprefix ? iprefix : cpp_GCC_INCLUDE_DIR;
1589 prefix_len = iprefix ? strlen (iprefix) : cpp_GCC_INCLUDE_DIR_len;
1591 path = (char *) xmalloc (prefix_len + suffix_len + 1);
1592 memcpy (path, prefix, prefix_len);
1593 memcpy (path + prefix_len, suffix, suffix_len);
1594 path[prefix_len + suffix_len] = '\0';
1596 add_path (path, chain, 0, false);
1599 /* Handle -D, -U, -A, -imacros, and the first -include. */
1601 finish_options (void)
1603 if (!cpp_opts->preprocessed)
1607 cb_file_change (parse_in,
1608 linemap_add (line_table, LC_RENAME, 0,
1609 _("<built-in>"), 0));
1611 cpp_init_builtins (parse_in, flag_hosted);
1612 c_cpp_builtins (parse_in);
1614 /* We're about to send user input to cpplib, so make it warn for
1615 things that we previously (when we sent it internal definitions)
1616 told it to not warn.
1618 C99 permits implementation-defined characters in identifiers.
1619 The documented meaning of -std= is to turn off extensions that
1620 conflict with the specified standard, and since a strictly
1621 conforming program cannot contain a '$', we do not condition
1622 their acceptance on the -std= setting. */
1623 cpp_opts->warn_dollars = (cpp_opts->pedantic && !cpp_opts->c99);
1625 cb_file_change (parse_in,
1626 linemap_add (line_table, LC_RENAME, 0,
1627 _("<command-line>"), 0));
1629 for (i = 0; i < deferred_count; i++)
1631 struct deferred_opt *opt = &deferred_opts[i];
1633 if (opt->code == OPT_D)
1634 cpp_define (parse_in, opt->arg);
1635 else if (opt->code == OPT_U)
1636 cpp_undef (parse_in, opt->arg);
1637 else if (opt->code == OPT_A)
1639 if (opt->arg[0] == '-')
1640 cpp_unassert (parse_in, opt->arg + 1);
1642 cpp_assert (parse_in, opt->arg);
1646 /* Start the main input file, if the debug writer wants it. */
1647 if (debug_hooks->start_end_main_source_file
1648 && !flag_preprocess_only)
1649 (*debug_hooks->start_source_file) (0, this_input_filename);
1651 /* Handle -imacros after -D and -U. */
1652 for (i = 0; i < deferred_count; i++)
1654 struct deferred_opt *opt = &deferred_opts[i];
1656 if (opt->code == OPT_imacros
1657 && cpp_push_include (parse_in, opt->arg))
1659 /* Disable push_command_line_include callback for now. */
1660 include_cursor = deferred_count + 1;
1661 cpp_scan_nooutput (parse_in);
1667 if (cpp_opts->directives_only)
1668 cpp_init_special_builtins (parse_in);
1670 /* Start the main input file, if the debug writer wants it. */
1671 if (debug_hooks->start_end_main_source_file
1672 && !flag_preprocess_only)
1673 (*debug_hooks->start_source_file) (0, this_input_filename);
1677 push_command_line_include ();
1680 /* Give CPP the next file given by -include, if any. */
1682 push_command_line_include (void)
1684 while (include_cursor < deferred_count)
1686 struct deferred_opt *opt = &deferred_opts[include_cursor++];
1688 if (!cpp_opts->preprocessed && opt->code == OPT_include
1689 && cpp_push_include (parse_in, opt->arg))
1693 if (include_cursor == deferred_count)
1696 /* -Wunused-macros should only warn about macros defined hereafter. */
1697 cpp_opts->warn_unused_macros = warn_unused_macros;
1698 /* Restore the line map from <command line>. */
1699 if (!cpp_opts->preprocessed)
1700 cpp_change_file (parse_in, LC_RENAME, this_input_filename);
1702 /* Set this here so the client can change the option if it wishes,
1703 and after stacking the main file so we don't trace the main file. */
1704 line_table->trace_includes = cpp_opts->print_include_names;
1708 /* File change callback. Has to handle -include files. */
1710 cb_file_change (cpp_reader * ARG_UNUSED (pfile),
1711 const struct line_map *new_map)
1713 if (flag_preprocess_only)
1714 pp_file_change (new_map);
1716 fe_file_change (new_map);
1718 if (new_map == 0 || (new_map->reason == LC_LEAVE && MAIN_FILE_P (new_map)))
1719 push_command_line_include ();
1723 cb_dir_change (cpp_reader * ARG_UNUSED (pfile), const char *dir)
1725 if (!set_src_pwd (dir))
1726 warning (0, "too late for # directive to set debug directory");
1729 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1730 extensions if ISO). There is no concept of gnu94. */
1732 set_std_c89 (int c94, int iso)
1734 cpp_set_lang (parse_in, c94 ? CLK_STDC94: iso ? CLK_STDC89: CLK_GNUC89);
1737 flag_no_gnu_keywords = iso;
1738 flag_no_nonansi_builtin = iso;
1744 /* Set the C 99 standard (without GNU extensions if ISO). */
1746 set_std_c99 (int iso)
1748 cpp_set_lang (parse_in, iso ? CLK_STDC99: CLK_GNUC99);
1750 flag_no_nonansi_builtin = iso;
1757 /* Set the C 1X standard draft (without GNU extensions if ISO). */
1759 set_std_c1x (int iso)
1761 cpp_set_lang (parse_in, iso ? CLK_STDC1X: CLK_GNUC1X);
1763 flag_no_nonansi_builtin = iso;
1770 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1772 set_std_cxx98 (int iso)
1774 cpp_set_lang (parse_in, iso ? CLK_CXX98: CLK_GNUCXX);
1775 flag_no_gnu_keywords = iso;
1776 flag_no_nonansi_builtin = iso;
1778 cxx_dialect = cxx98;
1781 /* Set the C++ 0x working draft "standard" (without GNU extensions if ISO). */
1783 set_std_cxx0x (int iso)
1785 cpp_set_lang (parse_in, iso ? CLK_CXX0X: CLK_GNUCXX0X);
1786 flag_no_gnu_keywords = iso;
1787 flag_no_nonansi_builtin = iso;
1789 cxx_dialect = cxx0x;
1792 /* Args to -d specify what to dump. Silently ignore
1793 unrecognized options; they may be aimed at toplev.c. */
1795 handle_OPT_d (const char *arg)
1799 while ((c = *arg++) != '\0')
1802 case 'M': /* Dump macros only. */
1803 case 'N': /* Dump names. */
1804 case 'D': /* Dump definitions. */
1805 case 'U': /* Dump used macros. */
1806 flag_dump_macros = c;
1810 flag_dump_includes = 1;