1 /* C/ObjC/C++ command line option handling.
2 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008
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. */
44 #ifndef DOLLARS_IN_IDENTIFIERS
45 # define DOLLARS_IN_IDENTIFIERS true
48 #ifndef TARGET_SYSTEM_ROOT
49 # define TARGET_SYSTEM_ROOT NULL
53 #define TARGET_OPTF(ARG)
57 static cpp_options *cpp_opts;
60 static const char *this_input_filename;
62 /* Filename and stream for preprocessed output. */
63 static const char *out_fname;
64 static FILE *out_stream;
66 /* Append dependencies to deps_file. */
67 static bool deps_append;
69 /* If dependency switches (-MF etc.) have been given. */
70 static bool deps_seen;
75 /* Dependency output file. */
76 static const char *deps_file;
78 /* The prefix given by -iprefix, if any. */
79 static const char *iprefix;
81 /* The multilib directory given by -imultilib, if any. */
82 static const char *imultilib;
84 /* The system root, if any. Overridden by -isysroot. */
85 static const char *sysroot = TARGET_SYSTEM_ROOT;
87 /* Zero disables all standard directories for headers. */
88 static bool std_inc = true;
90 /* Zero disables the C++-specific standard directories for headers. */
91 static bool std_cxx_inc = true;
93 /* If the quote chain has been split by -I-. */
94 static bool quote_chain_split;
96 /* If -Wunused-macros. */
97 static bool warn_unused_macros;
99 /* If -Wvariadic-macros. */
100 static bool warn_variadic_macros = true;
102 /* Number of deferred options. */
103 static size_t deferred_count;
105 /* Number of deferred options scanned for -include. */
106 static size_t include_cursor;
108 static void set_Wimplicit (int);
109 static void handle_OPT_d (const char *);
110 static void set_std_cxx98 (int);
111 static void set_std_cxx0x (int);
112 static void set_std_c89 (int, int);
113 static void set_std_c99 (int);
114 static void check_deps_environment_vars (void);
115 static void handle_deferred_opts (void);
116 static void sanitize_cpp_opts (void);
117 static void add_prefixed_path (const char *, size_t);
118 static void push_command_line_include (void);
119 static void cb_file_change (cpp_reader *, const struct line_map *);
120 static void cb_dir_change (cpp_reader *, const char *);
121 static void finish_options (void);
123 #ifndef STDC_0_IN_SYSTEM_HEADERS
124 #define STDC_0_IN_SYSTEM_HEADERS 0
127 /* Holds switches parsed by c_common_handle_option (), but whose
128 handling is deferred to c_common_post_options (). */
129 static void defer_opt (enum opt_code, const char *);
130 static struct deferred_opt
136 /* Complain that switch CODE expects an argument but none was
137 provided. OPT was the command-line option. Return FALSE to get
138 the default message in opts.c, TRUE if we provide a specialized
141 c_common_missing_argument (const char *opt, size_t code)
146 /* Pick up the default message. */
149 case OPT_fconstant_string_class_:
150 error ("no class name specified with %qs", opt);
154 error ("assertion missing after %qs", opt);
159 error ("macro name missing after %qs", opt);
168 error ("missing path after %qs", opt);
177 error ("missing filename after %qs", opt);
182 error ("missing makefile target after %qs", opt);
189 /* Defer option CODE with argument ARG. */
191 defer_opt (enum opt_code code, const char *arg)
193 deferred_opts[deferred_count].code = code;
194 deferred_opts[deferred_count].arg = arg;
198 /* Common initialization before parsing options. */
200 c_common_init_options (unsigned int argc, const char **argv)
202 static const unsigned int lang_flags[] = {CL_C, CL_ObjC, CL_CXX, CL_ObjCXX};
203 unsigned int i, result;
205 /* This is conditionalized only because that is the way the front
206 ends used to do it. Maybe this should be unconditional? */
207 if (c_dialect_cxx ())
209 /* By default wrap lines at 80 characters. Is getenv
210 ("COLUMNS") preferable? */
211 diagnostic_line_cutoff (global_dc) = 80;
212 /* By default, emit location information once for every
213 diagnostic message. */
214 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
217 parse_in = cpp_create_reader (c_dialect_cxx () ? CLK_GNUCXX: CLK_GNUC89,
218 ident_hash, line_table);
220 cpp_opts = cpp_get_options (parse_in);
221 cpp_opts->dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
222 cpp_opts->objc = c_dialect_objc ();
224 /* Reset to avoid warnings on internal definitions. We set it just
225 before passing on command-line options to cpplib. */
226 cpp_opts->warn_dollars = 0;
228 flag_exceptions = c_dialect_cxx ();
229 warn_pointer_arith = c_dialect_cxx ();
230 warn_write_strings = c_dialect_cxx();
232 /* By default, C99-like requirements for complex multiply and divide. */
233 flag_complex_method = 2;
235 deferred_opts = XNEWVEC (struct deferred_opt, argc);
237 result = lang_flags[c_language];
239 if (c_language == clk_c)
241 /* If preprocessing assembly language, accept any of the C-family
242 front end options since the driver may pass them through. */
243 for (i = 1; i < argc; i++)
244 if (! strcmp (argv[i], "-lang-asm"))
246 result |= CL_C | CL_ObjC | CL_CXX | CL_ObjCXX;
254 /* Handle switch SCODE with argument ARG. VALUE is true, unless no-
255 form of an -f or -W option was given. Returns 0 if the switch was
256 invalid, a negative number to prevent language-independent
257 processing in toplev.c (a hack necessary for the short-term). */
259 c_common_handle_option (size_t scode, const char *arg, int value)
261 const struct cl_option *option = &cl_options[scode];
262 enum opt_code code = (enum opt_code) scode;
265 /* Prevent resetting the language standard to a C dialect when the driver
266 has already determined that we're looking at assembler input. */
267 bool preprocessing_asm_p = (cpp_get_options (parse_in)->lang == CLK_ASM);
272 if (cl_options[code].flags & (CL_C | CL_CXX | CL_ObjC | CL_ObjCXX))
274 if ((option->flags & CL_TARGET)
275 && ! targetcm.handle_c_option (scode, arg, value))
282 case OPT__output_pch_:
287 defer_opt (code, arg);
291 cpp_opts->discard_comments = 0;
295 cpp_opts->discard_comments = 0;
296 cpp_opts->discard_comments_in_macro_exp = 0;
300 defer_opt (code, arg);
304 flag_preprocess_only = 1;
308 cpp_opts->print_include_names = 1;
312 TARGET_OPTF (xstrdup (arg));
316 if (strcmp (arg, "-"))
317 add_path (xstrdup (arg), BRACKET, 0, true);
320 if (quote_chain_split)
321 error ("-I- specified twice");
322 quote_chain_split = true;
323 split_quote_chain ();
324 inform ("obsolete option -I- used, please use -iquote instead");
330 /* When doing dependencies with -M or -MM, suppress normal
331 preprocessed output, but still do -dM etc. as software
332 depends on this. Preprocessed output does occur if -MD, -MMD
333 or environment var dependency generation is used. */
334 cpp_opts->deps.style = (code == OPT_M ? DEPS_SYSTEM: DEPS_USER);
336 cpp_opts->inhibit_warnings = 1;
341 cpp_opts->deps.style = (code == OPT_MD ? DEPS_SYSTEM: DEPS_USER);
352 cpp_opts->deps.missing_files = true;
357 cpp_opts->deps.phony_targets = true;
363 defer_opt (code, arg);
367 flag_no_line_commands = 1;
370 case OPT_fworking_directory:
371 flag_working_directory = value;
375 defer_opt (code, arg);
381 set_Wimplicit (value);
382 warn_char_subscripts = value;
383 warn_missing_braces = value;
384 warn_parentheses = value;
385 warn_return_type = value;
386 warn_sequence_point = value; /* Was C only. */
388 if (warn_strict_aliasing == -1)
389 set_Wstrict_aliasing (value);
390 warn_address = value;
391 if (warn_strict_overflow == -1)
392 warn_strict_overflow = value;
393 warn_array_bounds = value;
394 warn_volatile_register_var = value;
396 /* Only warn about unknown pragmas that are not in system
398 warn_unknown_pragmas = value;
400 /* We save the value of warn_uninitialized, since if they put
401 -Wuninitialized on the command line, we need to generate a
402 warning about not using it without also specifying -O. */
403 if (warn_uninitialized != 1)
404 warn_uninitialized = (value ? 2 : 0);
406 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. */
409 warn_main = value * 2;
412 /* C++-specific warnings. */
413 warn_sign_compare = value;
414 warn_reorder = value;
415 warn_cxx0x_compat = value;
418 cpp_opts->warn_trigraphs = value;
419 cpp_opts->warn_comments = value;
420 cpp_opts->warn_num_sign_change = value;
422 if (warn_pointer_sign == -1)
423 warn_pointer_sign = 1;
428 cpp_opts->warn_comments = value;
431 case OPT_Wdeprecated:
432 cpp_opts->warn_deprecated = value;
435 case OPT_Wendif_labels:
436 cpp_opts->warn_endif_labels = value;
440 cpp_opts->warnings_are_errors = value;
441 global_dc->warning_as_error_requested = value;
444 case OPT_Werror_implicit_function_declaration:
445 /* For backward compatibility, this is the same as
446 -Werror=implicit-function-declaration. */
447 enable_warning_as_error ("implicit-function-declaration", value, CL_C | CL_ObjC);
455 set_Wformat (atoi (arg));
459 set_Wimplicit (value);
463 /* Silently ignore for now. */
466 case OPT_Winvalid_pch:
467 cpp_opts->warn_invalid_pch = value;
477 case OPT_Wmissing_include_dirs:
478 cpp_opts->warn_missing_include_dirs = value;
482 cpp_opts->warn_multichar = value;
485 case OPT_Wnormalized_:
486 if (!value || (arg && strcasecmp (arg, "none") == 0))
487 cpp_opts->warn_normalize = normalized_none;
488 else if (!arg || strcasecmp (arg, "nfkc") == 0)
489 cpp_opts->warn_normalize = normalized_KC;
490 else if (strcasecmp (arg, "id") == 0)
491 cpp_opts->warn_normalize = normalized_identifier_C;
492 else if (strcasecmp (arg, "nfc") == 0)
493 cpp_opts->warn_normalize = normalized_C;
495 error ("argument %qs to %<-Wnormalized%> not recognized", arg);
498 case OPT_Wreturn_type:
499 warn_return_type = value;
502 case OPT_Wstrict_null_sentinel:
503 warn_strict_null_sentinel = value;
506 case OPT_Wsystem_headers:
507 cpp_opts->warn_system_headers = value;
510 case OPT_Wtraditional:
511 cpp_opts->warn_traditional = value;
515 cpp_opts->warn_trigraphs = value;
519 cpp_opts->warn_undef = value;
522 case OPT_Wunknown_pragmas:
523 /* Set to greater than 1, so that even unknown pragmas in
524 system headers will be warned about. */
525 warn_unknown_pragmas = value * 2;
528 case OPT_Wunused_macros:
529 warn_unused_macros = value;
532 case OPT_Wvariadic_macros:
533 warn_variadic_macros = value;
536 case OPT_Wwrite_strings:
537 warn_write_strings = value;
543 warn_nonvdtor = true;
547 if (!c_dialect_cxx ())
548 set_std_c89 (false, true);
550 set_std_cxx98 (true);
557 case OPT_fcond_mismatch:
558 if (!c_dialect_cxx ())
560 flag_cond_mismatch = value;
565 case OPT_fall_virtual:
566 case OPT_falt_external_templates:
567 case OPT_fenum_int_equiv:
568 case OPT_fexternal_templates:
569 case OPT_fguiding_decls:
571 case OPT_fhuge_objects:
573 case OPT_fname_mangling_version_:
575 case OPT_fnonnull_objects:
577 case OPT_fstrict_prototype:
578 case OPT_fthis_is_variable:
579 case OPT_fvtable_thunks:
582 warning (0, "switch %qs is no longer supported", option->opt_text);
585 case OPT_faccess_control:
586 flag_access_control = value;
590 flag_no_asm = !value;
594 flag_no_builtin = !value;
601 disable_builtin_function (arg);
604 case OPT_fdirectives_only:
605 cpp_opts->directives_only = value;
608 case OPT_fdollars_in_identifiers:
609 cpp_opts->dollars_in_ident = value;
612 case OPT_ffreestanding:
614 /* Fall through.... */
617 flag_no_builtin = !value;
618 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
619 if (!value && warn_main == 2)
623 case OPT_fshort_double:
624 flag_short_double = value;
627 case OPT_fshort_enums:
628 flag_short_enums = value;
631 case OPT_fshort_wchar:
632 flag_short_wchar = value;
635 case OPT_fsigned_bitfields:
636 flag_signed_bitfields = value;
639 case OPT_fsigned_char:
640 flag_signed_char = value;
643 case OPT_funsigned_bitfields:
644 flag_signed_bitfields = !value;
647 case OPT_funsigned_char:
648 flag_signed_char = !value;
652 flag_check_new = value;
655 case OPT_fconserve_space:
656 flag_conserve_space = value;
659 case OPT_fconstant_string_class_:
660 constant_string_class_name = arg;
663 case OPT_fdefault_inline:
664 flag_default_inline = value;
667 case OPT_felide_constructors:
668 flag_elide_constructors = value;
671 case OPT_fenforce_eh_specs:
672 flag_enforce_eh_specs = value;
675 case OPT_fextended_identifiers:
676 cpp_opts->extended_identifiers = value;
680 flag_new_for_scope = value;
683 case OPT_fgnu_keywords:
684 flag_no_gnu_keywords = !value;
687 case OPT_fgnu_runtime:
688 flag_next_runtime = !value;
691 case OPT_fhandle_exceptions:
692 warning (0, "-fhandle-exceptions has been renamed -fexceptions (and is now on by default)");
693 flag_exceptions = value;
696 case OPT_fimplement_inlines:
697 flag_implement_inlines = value;
700 case OPT_fimplicit_inline_templates:
701 flag_implicit_inline_templates = value;
704 case OPT_fimplicit_templates:
705 flag_implicit_templates = value;
708 case OPT_flax_vector_conversions:
709 flag_lax_vector_conversions = value;
712 case OPT_fms_extensions:
713 flag_ms_extensions = value;
716 case OPT_fnext_runtime:
717 flag_next_runtime = value;
720 case OPT_fnil_receivers:
721 flag_nil_receivers = value;
724 case OPT_fnonansi_builtins:
725 flag_no_nonansi_builtin = !value;
728 case OPT_foperator_names:
729 cpp_opts->operator_names = value;
732 case OPT_foptional_diags:
733 flag_optional_diags = value;
737 cpp_opts->restore_pch_deps = value;
740 case OPT_fpch_preprocess:
741 flag_pch_preprocess = value;
744 case OPT_fpermissive:
745 flag_permissive = value;
748 case OPT_fpreprocessed:
749 cpp_opts->preprocessed = value;
752 case OPT_freplace_objc_classes:
753 flag_replace_objc_classes = value;
757 flag_use_repository = value;
759 flag_implicit_templates = 0;
766 case OPT_fshow_column:
767 cpp_opts->show_column = value;
771 flag_detailed_statistics = value;
775 /* It is documented that we silently ignore silly values. */
776 if (value >= 1 && value <= 100)
777 cpp_opts->tabstop = value;
780 case OPT_fexec_charset_:
781 cpp_opts->narrow_charset = arg;
784 case OPT_fwide_exec_charset_:
785 cpp_opts->wide_charset = arg;
788 case OPT_finput_charset_:
789 cpp_opts->input_charset = arg;
792 case OPT_ftemplate_depth_:
793 max_tinst_depth = value;
796 case OPT_fuse_cxa_atexit:
797 flag_use_cxa_atexit = value;
800 case OPT_fuse_cxa_get_exception_ptr:
801 flag_use_cxa_get_exception_ptr = value;
804 case OPT_fvisibility_inlines_hidden:
805 visibility_options.inlines_hidden = value;
812 case OPT_fthreadsafe_statics:
813 flag_threadsafe_statics = value;
817 flag_zero_link = value;
821 flag_gen_declaration = 1;
824 case OPT_femit_struct_debug_baseonly:
825 set_struct_debug_option ("base");
828 case OPT_femit_struct_debug_reduced:
829 set_struct_debug_option ("dir:ord:sys,dir:gen:any,ind:base");
832 case OPT_femit_struct_debug_detailed_:
833 set_struct_debug_option (arg);
837 add_path (xstrdup (arg), AFTER, 0, true);
842 defer_opt (code, arg);
854 add_path (xstrdup (arg), QUOTE, 0, true);
862 add_path (xstrdup (arg), SYSTEM, 0, true);
865 case OPT_iwithprefix:
866 add_prefixed_path (arg, SYSTEM);
869 case OPT_iwithprefixbefore:
870 add_prefixed_path (arg, BRACKET);
874 cpp_set_lang (parse_in, CLK_ASM);
875 cpp_opts->dollars_in_ident = false;
894 error ("output filename specified twice");
897 /* We need to handle the -pedantic switches here, rather than in
898 c_common_post_options, so that a subsequent -Wno-endif-labels
899 is not overridden. */
900 case OPT_pedantic_errors:
901 cpp_opts->pedantic_errors = 1;
904 cpp_opts->pedantic = 1;
905 cpp_opts->warn_endif_labels = 1;
906 if (warn_pointer_sign == -1)
907 warn_pointer_sign = 1;
908 if (warn_overlength_strings == -1)
909 warn_overlength_strings = 1;
912 case OPT_print_objc_runtime_info:
913 print_struct_values = 1;
916 case OPT_print_pch_checksum:
917 c_common_print_pch_checksum (stdout);
918 exit_after_options = true;
926 case OPT_std_gnu__98:
927 if (!preprocessing_asm_p)
928 set_std_cxx98 (code == OPT_std_c__98 /* ISO */);
932 case OPT_std_gnu__0x:
933 if (!preprocessing_asm_p)
934 set_std_cxx0x (code == OPT_std_c__0x /* ISO */);
938 case OPT_std_iso9899_1990:
939 case OPT_std_iso9899_199409:
940 if (!preprocessing_asm_p)
941 set_std_c89 (code == OPT_std_iso9899_199409 /* c94 */, true /* ISO */);
945 if (!preprocessing_asm_p)
946 set_std_c89 (false /* c94 */, false /* ISO */);
951 case OPT_std_iso9899_1999:
952 case OPT_std_iso9899_199x:
953 if (!preprocessing_asm_p)
954 set_std_c99 (true /* ISO */);
959 if (!preprocessing_asm_p)
960 set_std_c99 (false /* ISO */);
964 cpp_opts->trigraphs = 1;
967 case OPT_traditional_cpp:
968 cpp_opts->traditional = 1;
976 cpp_opts->inhibit_warnings = 1;
987 /* Post-switch processing. */
989 c_common_post_options (const char **pfilename)
991 struct cpp_callbacks *cb;
993 /* Canonicalize the input and output filenames. */
994 if (in_fnames == NULL)
996 in_fnames = XNEWVEC (const char *, 1);
999 else if (strcmp (in_fnames[0], "-") == 0)
1002 if (out_fname == NULL || !strcmp (out_fname, "-"))
1005 if (cpp_opts->deps.style == DEPS_NONE)
1006 check_deps_environment_vars ();
1008 handle_deferred_opts ();
1010 sanitize_cpp_opts ();
1012 register_include_chains (parse_in, sysroot, iprefix, imultilib,
1013 std_inc, std_cxx_inc && c_dialect_cxx (), verbose);
1015 #ifdef C_COMMON_OVERRIDE_OPTIONS
1016 /* Some machines may reject certain combinations of C
1017 language-specific options. */
1018 C_COMMON_OVERRIDE_OPTIONS;
1021 flag_inline_trees = 1;
1023 /* Use tree inlining. */
1024 if (!flag_no_inline)
1026 if (flag_inline_functions)
1027 flag_inline_trees = 2;
1029 /* By default we use C99 inline semantics in GNU99 or C99 mode. C99
1030 inline semantics are not supported in GNU89 or C89 mode. */
1031 if (flag_gnu89_inline == -1)
1032 flag_gnu89_inline = !flag_isoc99;
1033 else if (!flag_gnu89_inline && !flag_isoc99)
1034 error ("-fno-gnu89-inline is only supported in GNU99 or C99 mode");
1036 /* If we are given more than one input file, we must use
1037 unit-at-a-time mode. */
1038 if (num_in_fnames > 1)
1039 flag_unit_at_a_time = 1;
1041 /* Default to ObjC sjlj exception handling if NeXT runtime. */
1042 if (flag_objc_sjlj_exceptions < 0)
1043 flag_objc_sjlj_exceptions = flag_next_runtime;
1044 if (flag_objc_exceptions && !flag_objc_sjlj_exceptions)
1045 flag_exceptions = 1;
1047 /* -Wextra implies -Wtype-limits, -Wclobbered,
1048 -Wempty-body, -Wsign-compare,
1049 -Wmissing-field-initializers, -Wmissing-parameter-type
1050 -Wold-style-declaration, -Woverride-init and -Wignored-qualifiers
1051 but not if explicitly overridden. */
1052 if (warn_type_limits == -1)
1053 warn_type_limits = extra_warnings;
1054 if (warn_clobbered == -1)
1055 warn_clobbered = extra_warnings;
1056 if (warn_empty_body == -1)
1057 warn_empty_body = extra_warnings;
1058 if (warn_sign_compare == -1)
1059 warn_sign_compare = extra_warnings;
1060 if (warn_missing_field_initializers == -1)
1061 warn_missing_field_initializers = extra_warnings;
1062 if (warn_missing_parameter_type == -1)
1063 warn_missing_parameter_type = extra_warnings;
1064 if (warn_old_style_declaration == -1)
1065 warn_old_style_declaration = extra_warnings;
1066 if (warn_override_init == -1)
1067 warn_override_init = extra_warnings;
1068 if (warn_ignored_qualifiers == -1)
1069 warn_ignored_qualifiers = extra_warnings;
1071 /* -Wpointer_sign is disabled by default, but it is enabled if any
1072 of -Wall or -pedantic are given. */
1073 if (warn_pointer_sign == -1)
1074 warn_pointer_sign = 0;
1076 if (warn_strict_aliasing == -1)
1077 warn_strict_aliasing = 0;
1078 if (warn_strict_overflow == -1)
1079 warn_strict_overflow = 0;
1081 /* -Woverlength-strings is off by default, but is enabled by -pedantic.
1082 It is never enabled in C++, as the minimum limit is not normative
1083 in that standard. */
1084 if (warn_overlength_strings == -1 || c_dialect_cxx ())
1085 warn_overlength_strings = 0;
1087 /* Adjust various flags for C++ based on command-line settings. */
1088 if (c_dialect_cxx ())
1090 if (!flag_no_inline)
1092 flag_inline_trees = 1;
1095 if (flag_inline_functions)
1096 flag_inline_trees = 2;
1099 /* In C, -Wconversion enables -Wsign-conversion (unless disabled
1100 through -Wno-sign-conversion). While in C++,
1101 -Wsign-conversion needs to be requested explicitly. */
1102 if (warn_sign_conversion == -1)
1103 warn_sign_conversion = (c_dialect_cxx ()) ? 0 : warn_conversion;
1106 /* Special format checking options don't work without -Wformat; warn if
1110 warning (OPT_Wformat_y2k,
1111 "-Wformat-y2k ignored without -Wformat");
1112 warning (OPT_Wformat_extra_args,
1113 "-Wformat-extra-args ignored without -Wformat");
1114 warning (OPT_Wformat_zero_length,
1115 "-Wformat-zero-length ignored without -Wformat");
1116 warning (OPT_Wformat_nonliteral,
1117 "-Wformat-nonliteral ignored without -Wformat");
1118 warning (OPT_Wformat_contains_nul,
1119 "-Wformat-contains-nul ignored without -Wformat");
1120 warning (OPT_Wformat_security,
1121 "-Wformat-security ignored without -Wformat");
1124 /* -Wimplicit-function-declaration is enabled by default for C99. */
1125 if (warn_implicit_function_declaration == -1)
1126 warn_implicit_function_declaration = flag_isoc99;
1128 /* If we're allowing C++0x constructs, don't warn about C++0x
1129 compatibility problems. */
1130 if (cxx_dialect == cxx0x)
1131 warn_cxx0x_compat = 0;
1133 if (flag_preprocess_only)
1135 /* Open the output now. We must do so even if flag_no_output is
1136 on, because there may be other output than from the actual
1137 preprocessing (e.g. from -dM). */
1138 if (out_fname[0] == '\0')
1139 out_stream = stdout;
1141 out_stream = fopen (out_fname, "w");
1143 if (out_stream == NULL)
1145 fatal_error ("opening output file %s: %m", out_fname);
1149 if (num_in_fnames > 1)
1150 error ("too many filenames given. Type %s --help for usage",
1153 init_pp_output (out_stream);
1159 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1160 input_location = UNKNOWN_LOCATION;
1163 cb = cpp_get_callbacks (parse_in);
1164 cb->file_change = cb_file_change;
1165 cb->dir_change = cb_dir_change;
1166 cpp_post_options (parse_in);
1168 input_location = UNKNOWN_LOCATION;
1170 /* If an error has occurred in cpplib, note it so we fail
1172 errorcount += cpp_errors (parse_in);
1174 *pfilename = this_input_filename
1175 = cpp_read_main_file (parse_in, in_fnames[0]);
1176 /* Don't do any compilation or preprocessing if there is no input file. */
1177 if (this_input_filename == NULL)
1183 if (flag_working_directory
1184 && flag_preprocess_only && !flag_no_line_commands)
1185 pp_dir_change (parse_in, get_src_pwd ());
1187 return flag_preprocess_only;
1190 /* Front end initialization common to C, ObjC and C++. */
1192 c_common_init (void)
1194 /* Set up preprocessor arithmetic. Must be done after call to
1195 c_common_nodes_and_builtins for type nodes to be good. */
1196 cpp_opts->precision = TYPE_PRECISION (intmax_type_node);
1197 cpp_opts->char_precision = TYPE_PRECISION (char_type_node);
1198 cpp_opts->int_precision = TYPE_PRECISION (integer_type_node);
1199 cpp_opts->wchar_precision = TYPE_PRECISION (wchar_type_node);
1200 cpp_opts->unsigned_wchar = TYPE_UNSIGNED (wchar_type_node);
1201 cpp_opts->bytes_big_endian = BYTES_BIG_ENDIAN;
1203 /* This can't happen until after wchar_precision and bytes_big_endian
1205 cpp_init_iconv (parse_in);
1208 c_common_print_pch_checksum (stderr);
1210 /* Has to wait until now so that cpplib has its hash table. */
1213 if (flag_preprocess_only)
1216 preprocess_file (parse_in);
1223 /* Initialize the integrated preprocessor after debug output has been
1224 initialized; loop over each input file. */
1226 c_common_parse_file (int set_yydebug)
1234 warning(0, "The C parser does not support -dy, option ignored");
1238 "The Objective-C parser does not support -dy, option ignored");
1241 warning(0, "The C++ parser does not support -dy, option ignored");
1245 "The Objective-C++ parser does not support -dy, option ignored");
1254 /* Start the main input file, if the debug writer wants it. */
1255 if (debug_hooks->start_end_main_source_file)
1256 (*debug_hooks->start_source_file) (0, this_input_filename);
1263 /* And end the main input file, if the debug writer wants it */
1264 if (debug_hooks->start_end_main_source_file)
1265 (*debug_hooks->end_source_file) (0);
1266 if (++i >= num_in_fnames)
1268 cpp_undef_all (parse_in);
1269 cpp_clear_file_cache (parse_in);
1271 = cpp_read_main_file (parse_in, in_fnames[i]);
1272 /* If an input file is missing, abandon further compilation.
1273 cpplib has issued a diagnostic. */
1274 if (!this_input_filename)
1279 /* Common finish hook for the C, ObjC and C++ front ends. */
1281 c_common_finish (void)
1283 FILE *deps_stream = NULL;
1285 if (cpp_opts->deps.style != DEPS_NONE)
1287 /* If -M or -MM was seen without -MF, default output to the
1290 deps_stream = out_stream;
1293 deps_stream = fopen (deps_file, deps_append ? "a": "w");
1295 fatal_error ("opening dependency file %s: %m", deps_file);
1299 /* For performance, avoid tearing down cpplib's internal structures
1300 with cpp_destroy (). */
1301 errorcount += cpp_finish (parse_in, deps_stream);
1303 if (deps_stream && deps_stream != out_stream
1304 && (ferror (deps_stream) || fclose (deps_stream)))
1305 fatal_error ("closing dependency file %s: %m", deps_file);
1307 if (out_stream && (ferror (out_stream) || fclose (out_stream)))
1308 fatal_error ("when writing output to %s: %m", out_fname);
1311 /* Either of two environment variables can specify output of
1312 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1313 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1314 and DEPS_TARGET is the target to mention in the deps. They also
1315 result in dependency information being appended to the output file
1316 rather than overwriting it, and like Sun's compiler
1317 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1319 check_deps_environment_vars (void)
1323 GET_ENVIRONMENT (spec, "DEPENDENCIES_OUTPUT");
1325 cpp_opts->deps.style = DEPS_USER;
1328 GET_ENVIRONMENT (spec, "SUNPRO_DEPENDENCIES");
1331 cpp_opts->deps.style = DEPS_SYSTEM;
1332 cpp_opts->deps.ignore_main_file = true;
1338 /* Find the space before the DEPS_TARGET, if there is one. */
1339 char *s = strchr (spec, ' ');
1342 /* Let the caller perform MAKE quoting. */
1343 defer_opt (OPT_MT, s + 1);
1347 /* Command line -MF overrides environment variables and default. */
1356 /* Handle deferred command line switches. */
1358 handle_deferred_opts (void)
1363 /* Avoid allocating the deps buffer if we don't need it.
1364 (This flag may be true without there having been -MT or -MQ
1365 options, but we'll still need the deps buffer.) */
1369 deps = cpp_get_deps (parse_in);
1371 for (i = 0; i < deferred_count; i++)
1373 struct deferred_opt *opt = &deferred_opts[i];
1375 if (opt->code == OPT_MT || opt->code == OPT_MQ)
1376 deps_add_target (deps, opt->arg, opt->code == OPT_MQ);
1380 /* These settings are appropriate for GCC, but not necessarily so for
1381 cpplib as a library. */
1383 sanitize_cpp_opts (void)
1385 /* If we don't know what style of dependencies to output, complain
1386 if any other dependency switches have been given. */
1387 if (deps_seen && cpp_opts->deps.style == DEPS_NONE)
1388 error ("to generate dependencies you must specify either -M or -MM");
1390 /* -dM and dependencies suppress normal output; do it here so that
1391 the last -d[MDN] switch overrides earlier ones. */
1392 if (flag_dump_macros == 'M')
1395 /* By default, -fdirectives-only implies -dD. This allows subsequent phases
1396 to perform proper macro expansion. */
1397 if (cpp_opts->directives_only && !cpp_opts->preprocessed && !flag_dump_macros)
1398 flag_dump_macros = 'D';
1400 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1401 -dM since at least glibc relies on -M -dM to work. */
1402 /* Also, flag_no_output implies flag_no_line_commands, always. */
1405 if (flag_dump_macros != 'M')
1406 flag_dump_macros = 0;
1407 flag_dump_includes = 0;
1408 flag_no_line_commands = 1;
1410 else if (cpp_opts->deps.missing_files)
1411 error ("-MG may only be used with -M or -MM");
1413 cpp_opts->unsigned_char = !flag_signed_char;
1414 cpp_opts->stdc_0_in_system_headers = STDC_0_IN_SYSTEM_HEADERS;
1416 /* We want -Wno-long-long to override -pedantic -std=non-c99
1417 and/or -Wtraditional, whatever the ordering. */
1418 cpp_opts->warn_long_long
1419 = warn_long_long && ((pedantic
1420 && (c_dialect_cxx ()
1421 ? cxx_dialect == cxx98
1423 || warn_traditional);
1425 /* Similarly with -Wno-variadic-macros. No check for c99 here, since
1426 this also turns off warnings about GCCs extension. */
1427 cpp_opts->warn_variadic_macros
1428 = warn_variadic_macros && (pedantic || warn_traditional);
1430 /* If we're generating preprocessor output, emit current directory
1431 if explicitly requested or if debugging information is enabled.
1432 ??? Maybe we should only do it for debugging formats that
1433 actually output the current directory? */
1434 if (flag_working_directory == -1)
1435 flag_working_directory = (debug_info_level != DINFO_LEVEL_NONE);
1437 if (cpp_opts->directives_only)
1439 if (warn_unused_macros)
1440 error ("-fdirectives-only is incompatible with -Wunused_macros");
1441 if (cpp_opts->traditional)
1442 error ("-fdirectives-only is incompatible with -traditional");
1446 /* Add include path with a prefix at the front of its name. */
1448 add_prefixed_path (const char *suffix, size_t chain)
1452 size_t prefix_len, suffix_len;
1454 suffix_len = strlen (suffix);
1455 prefix = iprefix ? iprefix : cpp_GCC_INCLUDE_DIR;
1456 prefix_len = iprefix ? strlen (iprefix) : cpp_GCC_INCLUDE_DIR_len;
1458 path = (char *) xmalloc (prefix_len + suffix_len + 1);
1459 memcpy (path, prefix, prefix_len);
1460 memcpy (path + prefix_len, suffix, suffix_len);
1461 path[prefix_len + suffix_len] = '\0';
1463 add_path (path, chain, 0, false);
1466 /* Handle -D, -U, -A, -imacros, and the first -include. */
1468 finish_options (void)
1470 if (!cpp_opts->preprocessed)
1474 cb_file_change (parse_in,
1475 linemap_add (line_table, LC_RENAME, 0,
1476 _("<built-in>"), 0));
1478 cpp_init_builtins (parse_in, flag_hosted);
1479 c_cpp_builtins (parse_in);
1481 /* We're about to send user input to cpplib, so make it warn for
1482 things that we previously (when we sent it internal definitions)
1483 told it to not warn.
1485 C99 permits implementation-defined characters in identifiers.
1486 The documented meaning of -std= is to turn off extensions that
1487 conflict with the specified standard, and since a strictly
1488 conforming program cannot contain a '$', we do not condition
1489 their acceptance on the -std= setting. */
1490 cpp_opts->warn_dollars = (cpp_opts->pedantic && !cpp_opts->c99);
1492 cb_file_change (parse_in,
1493 linemap_add (line_table, LC_RENAME, 0,
1494 _("<command-line>"), 0));
1496 for (i = 0; i < deferred_count; i++)
1498 struct deferred_opt *opt = &deferred_opts[i];
1500 if (opt->code == OPT_D)
1501 cpp_define (parse_in, opt->arg);
1502 else if (opt->code == OPT_U)
1503 cpp_undef (parse_in, opt->arg);
1504 else if (opt->code == OPT_A)
1506 if (opt->arg[0] == '-')
1507 cpp_unassert (parse_in, opt->arg + 1);
1509 cpp_assert (parse_in, opt->arg);
1513 /* Handle -imacros after -D and -U. */
1514 for (i = 0; i < deferred_count; i++)
1516 struct deferred_opt *opt = &deferred_opts[i];
1518 if (opt->code == OPT_imacros
1519 && cpp_push_include (parse_in, opt->arg))
1521 /* Disable push_command_line_include callback for now. */
1522 include_cursor = deferred_count + 1;
1523 cpp_scan_nooutput (parse_in);
1527 else if (cpp_opts->directives_only)
1528 cpp_init_special_builtins (parse_in);
1531 push_command_line_include ();
1534 /* Give CPP the next file given by -include, if any. */
1536 push_command_line_include (void)
1538 while (include_cursor < deferred_count)
1540 struct deferred_opt *opt = &deferred_opts[include_cursor++];
1542 if (!cpp_opts->preprocessed && opt->code == OPT_include
1543 && cpp_push_include (parse_in, opt->arg))
1547 if (include_cursor == deferred_count)
1550 /* -Wunused-macros should only warn about macros defined hereafter. */
1551 cpp_opts->warn_unused_macros = warn_unused_macros;
1552 /* Restore the line map from <command line>. */
1553 if (!cpp_opts->preprocessed)
1554 cpp_change_file (parse_in, LC_RENAME, this_input_filename);
1556 /* Set this here so the client can change the option if it wishes,
1557 and after stacking the main file so we don't trace the main file. */
1558 line_table->trace_includes = cpp_opts->print_include_names;
1562 /* File change callback. Has to handle -include files. */
1564 cb_file_change (cpp_reader * ARG_UNUSED (pfile),
1565 const struct line_map *new_map)
1567 if (flag_preprocess_only)
1568 pp_file_change (new_map);
1570 fe_file_change (new_map);
1572 if (new_map == 0 || (new_map->reason == LC_LEAVE && MAIN_FILE_P (new_map)))
1573 push_command_line_include ();
1577 cb_dir_change (cpp_reader * ARG_UNUSED (pfile), const char *dir)
1579 if (!set_src_pwd (dir))
1580 warning (0, "too late for # directive to set debug directory");
1583 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1584 extensions if ISO). There is no concept of gnu94. */
1586 set_std_c89 (int c94, int iso)
1588 cpp_set_lang (parse_in, c94 ? CLK_STDC94: iso ? CLK_STDC89: CLK_GNUC89);
1591 flag_no_gnu_keywords = iso;
1592 flag_no_nonansi_builtin = iso;
1597 /* Set the C 99 standard (without GNU extensions if ISO). */
1599 set_std_c99 (int iso)
1601 cpp_set_lang (parse_in, iso ? CLK_STDC99: CLK_GNUC99);
1603 flag_no_nonansi_builtin = iso;
1609 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1611 set_std_cxx98 (int iso)
1613 cpp_set_lang (parse_in, iso ? CLK_CXX98: CLK_GNUCXX);
1614 flag_no_gnu_keywords = iso;
1615 flag_no_nonansi_builtin = iso;
1617 cxx_dialect = cxx98;
1620 /* Set the C++ 0x working draft "standard" (without GNU extensions if ISO). */
1622 set_std_cxx0x (int iso)
1624 cpp_set_lang (parse_in, iso ? CLK_CXX0X: CLK_GNUCXX0X);
1625 flag_no_gnu_keywords = iso;
1626 flag_no_nonansi_builtin = iso;
1628 cxx_dialect = cxx0x;
1631 /* Handle setting implicit to ON. */
1633 set_Wimplicit (int on)
1636 warn_implicit_int = on;
1637 warn_implicit_function_declaration = on;
1640 /* Args to -d specify what to dump. Silently ignore
1641 unrecognized options; they may be aimed at toplev.c. */
1643 handle_OPT_d (const char *arg)
1647 while ((c = *arg++) != '\0')
1650 case 'M': /* Dump macros only. */
1651 case 'N': /* Dump names. */
1652 case 'D': /* Dump definitions. */
1653 case 'U': /* Dump used macros. */
1654 flag_dump_macros = c;
1658 flag_dump_includes = 1;