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. */
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 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 (input_location, "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 ())
408 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding
409 can turn it off only if it's not explicit. */
411 warn_main = (value ? 2 : 0);
415 /* C++-specific warnings. */
416 warn_sign_compare = value;
417 warn_reorder = value;
418 warn_cxx0x_compat = value;
421 cpp_opts->warn_trigraphs = value;
422 cpp_opts->warn_comments = value;
423 cpp_opts->warn_num_sign_change = value;
425 if (warn_pointer_sign == -1)
426 warn_pointer_sign = value;
429 case OPT_Wbuiltin_macro_redefined:
430 cpp_opts->warn_builtin_macro_redefined = value;
435 cpp_opts->warn_comments = value;
438 case OPT_Wdeprecated:
439 cpp_opts->warn_deprecated = value;
442 case OPT_Wendif_labels:
443 cpp_opts->warn_endif_labels = value;
447 cpp_opts->warnings_are_errors = value;
448 global_dc->warning_as_error_requested = value;
451 case OPT_Werror_implicit_function_declaration:
452 /* For backward compatibility, this is the same as
453 -Werror=implicit-function-declaration. */
454 enable_warning_as_error ("implicit-function-declaration", value, CL_C | CL_ObjC);
462 set_Wformat (atoi (arg));
466 set_Wimplicit (value);
470 /* Silently ignore for now. */
473 case OPT_Winvalid_pch:
474 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;
620 case OPT_fshort_double:
621 flag_short_double = value;
624 case OPT_fshort_enums:
625 flag_short_enums = value;
628 case OPT_fshort_wchar:
629 flag_short_wchar = value;
632 case OPT_fsigned_bitfields:
633 flag_signed_bitfields = value;
636 case OPT_fsigned_char:
637 flag_signed_char = value;
640 case OPT_funsigned_bitfields:
641 flag_signed_bitfields = !value;
644 case OPT_funsigned_char:
645 flag_signed_char = !value;
649 flag_check_new = value;
652 case OPT_fconserve_space:
653 flag_conserve_space = value;
656 case OPT_fconstant_string_class_:
657 constant_string_class_name = arg;
660 case OPT_fdefault_inline:
661 flag_default_inline = value;
664 case OPT_felide_constructors:
665 flag_elide_constructors = value;
668 case OPT_fenforce_eh_specs:
669 flag_enforce_eh_specs = value;
672 case OPT_fextended_identifiers:
673 cpp_opts->extended_identifiers = value;
677 flag_new_for_scope = value;
680 case OPT_fgnu_keywords:
681 flag_no_gnu_keywords = !value;
684 case OPT_fgnu_runtime:
685 flag_next_runtime = !value;
688 case OPT_fhandle_exceptions:
689 warning (0, "-fhandle-exceptions has been renamed -fexceptions (and is now on by default)");
690 flag_exceptions = value;
693 case OPT_fimplement_inlines:
694 flag_implement_inlines = value;
697 case OPT_fimplicit_inline_templates:
698 flag_implicit_inline_templates = value;
701 case OPT_fimplicit_templates:
702 flag_implicit_templates = value;
705 case OPT_flax_vector_conversions:
706 flag_lax_vector_conversions = value;
709 case OPT_fms_extensions:
710 flag_ms_extensions = value;
713 case OPT_fnext_runtime:
714 flag_next_runtime = value;
717 case OPT_fnil_receivers:
718 flag_nil_receivers = value;
721 case OPT_fnonansi_builtins:
722 flag_no_nonansi_builtin = !value;
725 case OPT_foperator_names:
726 cpp_opts->operator_names = value;
729 case OPT_foptional_diags:
730 flag_optional_diags = value;
734 cpp_opts->restore_pch_deps = value;
737 case OPT_fpch_preprocess:
738 flag_pch_preprocess = value;
741 case OPT_fpermissive:
742 flag_permissive = value;
745 case OPT_fpreprocessed:
746 cpp_opts->preprocessed = value;
749 case OPT_freplace_objc_classes:
750 flag_replace_objc_classes = value;
754 flag_use_repository = value;
756 flag_implicit_templates = 0;
763 case OPT_fshow_column:
764 cpp_opts->show_column = value;
768 flag_detailed_statistics = value;
772 /* It is documented that we silently ignore silly values. */
773 if (value >= 1 && value <= 100)
774 cpp_opts->tabstop = value;
777 case OPT_fexec_charset_:
778 cpp_opts->narrow_charset = arg;
781 case OPT_fwide_exec_charset_:
782 cpp_opts->wide_charset = arg;
785 case OPT_finput_charset_:
786 cpp_opts->input_charset = arg;
789 case OPT_ftemplate_depth_:
790 max_tinst_depth = value;
793 case OPT_fuse_cxa_atexit:
794 flag_use_cxa_atexit = value;
797 case OPT_fuse_cxa_get_exception_ptr:
798 flag_use_cxa_get_exception_ptr = value;
801 case OPT_fvisibility_inlines_hidden:
802 visibility_options.inlines_hidden = value;
809 case OPT_fthreadsafe_statics:
810 flag_threadsafe_statics = value;
814 flag_zero_link = value;
818 flag_gen_declaration = 1;
821 case OPT_femit_struct_debug_baseonly:
822 set_struct_debug_option ("base");
825 case OPT_femit_struct_debug_reduced:
826 set_struct_debug_option ("dir:ord:sys,dir:gen:any,ind:base");
829 case OPT_femit_struct_debug_detailed_:
830 set_struct_debug_option (arg);
834 add_path (xstrdup (arg), AFTER, 0, true);
839 defer_opt (code, arg);
851 add_path (xstrdup (arg), QUOTE, 0, true);
859 add_path (xstrdup (arg), SYSTEM, 0, true);
862 case OPT_iwithprefix:
863 add_prefixed_path (arg, SYSTEM);
866 case OPT_iwithprefixbefore:
867 add_prefixed_path (arg, BRACKET);
871 cpp_set_lang (parse_in, CLK_ASM);
872 cpp_opts->dollars_in_ident = false;
891 error ("output filename specified twice");
894 /* We need to handle the -pedantic switches here, rather than in
895 c_common_post_options, so that a subsequent -Wno-endif-labels
896 is not overridden. */
897 case OPT_pedantic_errors:
898 cpp_opts->pedantic_errors = 1;
901 cpp_opts->pedantic = 1;
902 cpp_opts->warn_endif_labels = 1;
903 if (warn_pointer_sign == -1)
904 warn_pointer_sign = 1;
905 if (warn_overlength_strings == -1)
906 warn_overlength_strings = 1;
911 case OPT_print_objc_runtime_info:
912 print_struct_values = 1;
915 case OPT_print_pch_checksum:
916 c_common_print_pch_checksum (stdout);
917 exit_after_options = true;
925 case OPT_std_gnu__98:
926 if (!preprocessing_asm_p)
927 set_std_cxx98 (code == OPT_std_c__98 /* ISO */);
931 case OPT_std_gnu__0x:
932 if (!preprocessing_asm_p)
933 set_std_cxx0x (code == OPT_std_c__0x /* ISO */);
937 case OPT_std_iso9899_1990:
938 case OPT_std_iso9899_199409:
939 if (!preprocessing_asm_p)
940 set_std_c89 (code == OPT_std_iso9899_199409 /* c94 */, true /* ISO */);
944 if (!preprocessing_asm_p)
945 set_std_c89 (false /* c94 */, false /* ISO */);
950 case OPT_std_iso9899_1999:
951 case OPT_std_iso9899_199x:
952 if (!preprocessing_asm_p)
953 set_std_c99 (true /* ISO */);
958 if (!preprocessing_asm_p)
959 set_std_c99 (false /* ISO */);
963 cpp_opts->trigraphs = 1;
966 case OPT_traditional_cpp:
967 cpp_opts->traditional = 1;
975 cpp_opts->inhibit_warnings = 1;
990 /* Post-switch processing. */
992 c_common_post_options (const char **pfilename)
994 struct cpp_callbacks *cb;
996 /* Canonicalize the input and output filenames. */
997 if (in_fnames == NULL)
999 in_fnames = XNEWVEC (const char *, 1);
1002 else if (strcmp (in_fnames[0], "-") == 0)
1005 if (out_fname == NULL || !strcmp (out_fname, "-"))
1008 if (cpp_opts->deps.style == DEPS_NONE)
1009 check_deps_environment_vars ();
1011 handle_deferred_opts ();
1013 sanitize_cpp_opts ();
1015 register_include_chains (parse_in, sysroot, iprefix, imultilib,
1016 std_inc, std_cxx_inc && c_dialect_cxx (), verbose);
1018 #ifdef C_COMMON_OVERRIDE_OPTIONS
1019 /* Some machines may reject certain combinations of C
1020 language-specific options. */
1021 C_COMMON_OVERRIDE_OPTIONS;
1024 /* By default we use C99 inline semantics in GNU99 or C99 mode. C99
1025 inline semantics are not supported in GNU89 or C89 mode. */
1026 if (flag_gnu89_inline == -1)
1027 flag_gnu89_inline = !flag_isoc99;
1028 else if (!flag_gnu89_inline && !flag_isoc99)
1029 error ("-fno-gnu89-inline is only supported in GNU99 or C99 mode");
1031 /* Default to ObjC sjlj exception handling if NeXT runtime. */
1032 if (flag_objc_sjlj_exceptions < 0)
1033 flag_objc_sjlj_exceptions = flag_next_runtime;
1034 if (flag_objc_exceptions && !flag_objc_sjlj_exceptions)
1035 flag_exceptions = 1;
1037 /* -Wextra implies -Wtype-limits, -Wclobbered,
1038 -Wempty-body, -Wsign-compare,
1039 -Wmissing-field-initializers, -Wmissing-parameter-type
1040 -Wold-style-declaration, -Woverride-init and -Wignored-qualifiers
1041 but not if explicitly overridden. */
1042 if (warn_type_limits == -1)
1043 warn_type_limits = extra_warnings;
1044 if (warn_clobbered == -1)
1045 warn_clobbered = extra_warnings;
1046 if (warn_empty_body == -1)
1047 warn_empty_body = extra_warnings;
1048 if (warn_sign_compare == -1)
1049 warn_sign_compare = extra_warnings;
1050 if (warn_missing_field_initializers == -1)
1051 warn_missing_field_initializers = extra_warnings;
1052 if (warn_missing_parameter_type == -1)
1053 warn_missing_parameter_type = extra_warnings;
1054 if (warn_old_style_declaration == -1)
1055 warn_old_style_declaration = extra_warnings;
1056 if (warn_override_init == -1)
1057 warn_override_init = extra_warnings;
1058 if (warn_ignored_qualifiers == -1)
1059 warn_ignored_qualifiers = extra_warnings;
1061 /* -Wpointer-sign is disabled by default, but it is enabled if any
1062 of -Wall or -pedantic are given. */
1063 if (warn_pointer_sign == -1)
1064 warn_pointer_sign = 0;
1066 if (warn_strict_aliasing == -1)
1067 warn_strict_aliasing = 0;
1068 if (warn_strict_overflow == -1)
1069 warn_strict_overflow = 0;
1071 /* -Woverlength-strings is off by default, but is enabled by -pedantic.
1072 It is never enabled in C++, as the minimum limit is not normative
1073 in that standard. */
1074 if (warn_overlength_strings == -1 || c_dialect_cxx ())
1075 warn_overlength_strings = 0;
1077 /* Wmain is enabled by default in C++ but not in C. */
1078 /* Wmain is disabled by default for -ffreestanding (!flag_hosted),
1079 even if -Wall was given (warn_main will be 2 if set by -Wall, 1
1080 if set by -Wmain). */
1081 if (warn_main == -1)
1082 warn_main = (c_dialect_cxx () && flag_hosted) ? 1 : 0;
1083 else if (warn_main == 2)
1084 warn_main = flag_hosted ? 1 : 0;
1086 /* In C, -Wconversion enables -Wsign-conversion (unless disabled
1087 through -Wno-sign-conversion). While in C++,
1088 -Wsign-conversion needs to be requested explicitly. */
1089 if (warn_sign_conversion == -1)
1090 warn_sign_conversion = (c_dialect_cxx ()) ? 0 : warn_conversion;
1092 /* -Wpacked-bitfield-compat is on by default for the C languages. The
1093 warning is issued in stor-layout.c which is not part of the front-end so
1094 we need to selectively turn it on here. */
1095 if (warn_packed_bitfield_compat == -1)
1096 warn_packed_bitfield_compat = 1;
1098 /* Special format checking options don't work without -Wformat; warn if
1102 warning (OPT_Wformat_y2k,
1103 "-Wformat-y2k ignored without -Wformat");
1104 warning (OPT_Wformat_extra_args,
1105 "-Wformat-extra-args ignored without -Wformat");
1106 warning (OPT_Wformat_zero_length,
1107 "-Wformat-zero-length ignored without -Wformat");
1108 warning (OPT_Wformat_nonliteral,
1109 "-Wformat-nonliteral ignored without -Wformat");
1110 warning (OPT_Wformat_contains_nul,
1111 "-Wformat-contains-nul ignored without -Wformat");
1112 warning (OPT_Wformat_security,
1113 "-Wformat-security ignored without -Wformat");
1116 /* -Wimplicit-function-declaration is enabled by default for C99. */
1117 if (warn_implicit_function_declaration == -1)
1118 warn_implicit_function_declaration = flag_isoc99;
1120 /* If we're allowing C++0x constructs, don't warn about C++0x
1121 compatibility problems. */
1122 if (cxx_dialect == cxx0x)
1123 warn_cxx0x_compat = 0;
1125 if (flag_preprocess_only)
1127 /* Open the output now. We must do so even if flag_no_output is
1128 on, because there may be other output than from the actual
1129 preprocessing (e.g. from -dM). */
1130 if (out_fname[0] == '\0')
1131 out_stream = stdout;
1133 out_stream = fopen (out_fname, "w");
1135 if (out_stream == NULL)
1137 fatal_error ("opening output file %s: %m", out_fname);
1141 if (num_in_fnames > 1)
1142 error ("too many filenames given. Type %s --help for usage",
1145 init_pp_output (out_stream);
1151 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1152 input_location = UNKNOWN_LOCATION;
1155 cb = cpp_get_callbacks (parse_in);
1156 cb->file_change = cb_file_change;
1157 cb->dir_change = cb_dir_change;
1158 cpp_post_options (parse_in);
1160 input_location = UNKNOWN_LOCATION;
1162 /* If an error has occurred in cpplib, note it so we fail
1164 errorcount += cpp_errors (parse_in);
1166 *pfilename = this_input_filename
1167 = cpp_read_main_file (parse_in, in_fnames[0]);
1168 /* Don't do any compilation or preprocessing if there is no input file. */
1169 if (this_input_filename == NULL)
1175 if (flag_working_directory
1176 && flag_preprocess_only && !flag_no_line_commands)
1177 pp_dir_change (parse_in, get_src_pwd ());
1179 return flag_preprocess_only;
1182 /* Front end initialization common to C, ObjC and C++. */
1184 c_common_init (void)
1186 /* Set up preprocessor arithmetic. Must be done after call to
1187 c_common_nodes_and_builtins for type nodes to be good. */
1188 cpp_opts->precision = TYPE_PRECISION (intmax_type_node);
1189 cpp_opts->char_precision = TYPE_PRECISION (char_type_node);
1190 cpp_opts->int_precision = TYPE_PRECISION (integer_type_node);
1191 cpp_opts->wchar_precision = TYPE_PRECISION (wchar_type_node);
1192 cpp_opts->unsigned_wchar = TYPE_UNSIGNED (wchar_type_node);
1193 cpp_opts->bytes_big_endian = BYTES_BIG_ENDIAN;
1195 /* This can't happen until after wchar_precision and bytes_big_endian
1197 cpp_init_iconv (parse_in);
1200 c_common_print_pch_checksum (stderr);
1202 /* Has to wait until now so that cpplib has its hash table. */
1205 if (flag_preprocess_only)
1208 preprocess_file (parse_in);
1215 /* Initialize the integrated preprocessor after debug output has been
1216 initialized; loop over each input file. */
1218 c_common_parse_file (int set_yydebug)
1226 warning(0, "The C parser does not support -dy, option ignored");
1230 "The Objective-C parser does not support -dy, option ignored");
1233 warning(0, "The C++ parser does not support -dy, option ignored");
1237 "The Objective-C++ parser does not support -dy, option ignored");
1246 /* Start the main input file, if the debug writer wants it. */
1247 if (debug_hooks->start_end_main_source_file)
1248 (*debug_hooks->start_source_file) (0, this_input_filename);
1255 /* And end the main input file, if the debug writer wants it */
1256 if (debug_hooks->start_end_main_source_file)
1257 (*debug_hooks->end_source_file) (0);
1258 if (++i >= num_in_fnames)
1260 cpp_undef_all (parse_in);
1261 cpp_clear_file_cache (parse_in);
1263 = cpp_read_main_file (parse_in, in_fnames[i]);
1264 /* If an input file is missing, abandon further compilation.
1265 cpplib has issued a diagnostic. */
1266 if (!this_input_filename)
1271 /* Common finish hook for the C, ObjC and C++ front ends. */
1273 c_common_finish (void)
1275 FILE *deps_stream = NULL;
1277 if (cpp_opts->deps.style != DEPS_NONE)
1279 /* If -M or -MM was seen without -MF, default output to the
1282 deps_stream = out_stream;
1285 deps_stream = fopen (deps_file, deps_append ? "a": "w");
1287 fatal_error ("opening dependency file %s: %m", deps_file);
1291 /* For performance, avoid tearing down cpplib's internal structures
1292 with cpp_destroy (). */
1293 errorcount += cpp_finish (parse_in, deps_stream);
1295 if (deps_stream && deps_stream != out_stream
1296 && (ferror (deps_stream) || fclose (deps_stream)))
1297 fatal_error ("closing dependency file %s: %m", deps_file);
1299 if (out_stream && (ferror (out_stream) || fclose (out_stream)))
1300 fatal_error ("when writing output to %s: %m", out_fname);
1303 /* Either of two environment variables can specify output of
1304 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1305 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1306 and DEPS_TARGET is the target to mention in the deps. They also
1307 result in dependency information being appended to the output file
1308 rather than overwriting it, and like Sun's compiler
1309 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1311 check_deps_environment_vars (void)
1315 GET_ENVIRONMENT (spec, "DEPENDENCIES_OUTPUT");
1317 cpp_opts->deps.style = DEPS_USER;
1320 GET_ENVIRONMENT (spec, "SUNPRO_DEPENDENCIES");
1323 cpp_opts->deps.style = DEPS_SYSTEM;
1324 cpp_opts->deps.ignore_main_file = true;
1330 /* Find the space before the DEPS_TARGET, if there is one. */
1331 char *s = strchr (spec, ' ');
1334 /* Let the caller perform MAKE quoting. */
1335 defer_opt (OPT_MT, s + 1);
1339 /* Command line -MF overrides environment variables and default. */
1348 /* Handle deferred command line switches. */
1350 handle_deferred_opts (void)
1355 /* Avoid allocating the deps buffer if we don't need it.
1356 (This flag may be true without there having been -MT or -MQ
1357 options, but we'll still need the deps buffer.) */
1361 deps = cpp_get_deps (parse_in);
1363 for (i = 0; i < deferred_count; i++)
1365 struct deferred_opt *opt = &deferred_opts[i];
1367 if (opt->code == OPT_MT || opt->code == OPT_MQ)
1368 deps_add_target (deps, opt->arg, opt->code == OPT_MQ);
1372 /* These settings are appropriate for GCC, but not necessarily so for
1373 cpplib as a library. */
1375 sanitize_cpp_opts (void)
1377 /* If we don't know what style of dependencies to output, complain
1378 if any other dependency switches have been given. */
1379 if (deps_seen && cpp_opts->deps.style == DEPS_NONE)
1380 error ("to generate dependencies you must specify either -M or -MM");
1382 /* -dM and dependencies suppress normal output; do it here so that
1383 the last -d[MDN] switch overrides earlier ones. */
1384 if (flag_dump_macros == 'M')
1387 /* By default, -fdirectives-only implies -dD. This allows subsequent phases
1388 to perform proper macro expansion. */
1389 if (cpp_opts->directives_only && !cpp_opts->preprocessed && !flag_dump_macros)
1390 flag_dump_macros = 'D';
1392 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1393 -dM since at least glibc relies on -M -dM to work. */
1394 /* Also, flag_no_output implies flag_no_line_commands, always. */
1397 if (flag_dump_macros != 'M')
1398 flag_dump_macros = 0;
1399 flag_dump_includes = 0;
1400 flag_no_line_commands = 1;
1402 else if (cpp_opts->deps.missing_files)
1403 error ("-MG may only be used with -M or -MM");
1405 cpp_opts->unsigned_char = !flag_signed_char;
1406 cpp_opts->stdc_0_in_system_headers = STDC_0_IN_SYSTEM_HEADERS;
1408 /* We want -Wno-long-long to override -pedantic -std=non-c99
1409 and/or -Wtraditional, whatever the ordering. */
1410 cpp_opts->warn_long_long
1411 = warn_long_long && ((pedantic
1412 && (c_dialect_cxx ()
1413 ? cxx_dialect == cxx98
1415 || warn_traditional);
1417 /* Similarly with -Wno-variadic-macros. No check for c99 here, since
1418 this also turns off warnings about GCCs extension. */
1419 cpp_opts->warn_variadic_macros
1420 = warn_variadic_macros && (pedantic || warn_traditional);
1422 /* If we're generating preprocessor output, emit current directory
1423 if explicitly requested or if debugging information is enabled.
1424 ??? Maybe we should only do it for debugging formats that
1425 actually output the current directory? */
1426 if (flag_working_directory == -1)
1427 flag_working_directory = (debug_info_level != DINFO_LEVEL_NONE);
1429 if (cpp_opts->directives_only)
1431 if (warn_unused_macros)
1432 error ("-fdirectives-only is incompatible with -Wunused_macros");
1433 if (cpp_opts->traditional)
1434 error ("-fdirectives-only is incompatible with -traditional");
1438 /* Add include path with a prefix at the front of its name. */
1440 add_prefixed_path (const char *suffix, size_t chain)
1444 size_t prefix_len, suffix_len;
1446 suffix_len = strlen (suffix);
1447 prefix = iprefix ? iprefix : cpp_GCC_INCLUDE_DIR;
1448 prefix_len = iprefix ? strlen (iprefix) : cpp_GCC_INCLUDE_DIR_len;
1450 path = (char *) xmalloc (prefix_len + suffix_len + 1);
1451 memcpy (path, prefix, prefix_len);
1452 memcpy (path + prefix_len, suffix, suffix_len);
1453 path[prefix_len + suffix_len] = '\0';
1455 add_path (path, chain, 0, false);
1458 /* Handle -D, -U, -A, -imacros, and the first -include. */
1460 finish_options (void)
1462 if (!cpp_opts->preprocessed)
1466 cb_file_change (parse_in,
1467 linemap_add (line_table, LC_RENAME, 0,
1468 _("<built-in>"), 0));
1470 cpp_init_builtins (parse_in, flag_hosted);
1471 c_cpp_builtins (parse_in);
1473 /* We're about to send user input to cpplib, so make it warn for
1474 things that we previously (when we sent it internal definitions)
1475 told it to not warn.
1477 C99 permits implementation-defined characters in identifiers.
1478 The documented meaning of -std= is to turn off extensions that
1479 conflict with the specified standard, and since a strictly
1480 conforming program cannot contain a '$', we do not condition
1481 their acceptance on the -std= setting. */
1482 cpp_opts->warn_dollars = (cpp_opts->pedantic && !cpp_opts->c99);
1484 cb_file_change (parse_in,
1485 linemap_add (line_table, LC_RENAME, 0,
1486 _("<command-line>"), 0));
1488 for (i = 0; i < deferred_count; i++)
1490 struct deferred_opt *opt = &deferred_opts[i];
1492 if (opt->code == OPT_D)
1493 cpp_define (parse_in, opt->arg);
1494 else if (opt->code == OPT_U)
1495 cpp_undef (parse_in, opt->arg);
1496 else if (opt->code == OPT_A)
1498 if (opt->arg[0] == '-')
1499 cpp_unassert (parse_in, opt->arg + 1);
1501 cpp_assert (parse_in, opt->arg);
1505 /* Handle -imacros after -D and -U. */
1506 for (i = 0; i < deferred_count; i++)
1508 struct deferred_opt *opt = &deferred_opts[i];
1510 if (opt->code == OPT_imacros
1511 && cpp_push_include (parse_in, opt->arg))
1513 /* Disable push_command_line_include callback for now. */
1514 include_cursor = deferred_count + 1;
1515 cpp_scan_nooutput (parse_in);
1519 else if (cpp_opts->directives_only)
1520 cpp_init_special_builtins (parse_in);
1523 push_command_line_include ();
1526 /* Give CPP the next file given by -include, if any. */
1528 push_command_line_include (void)
1530 while (include_cursor < deferred_count)
1532 struct deferred_opt *opt = &deferred_opts[include_cursor++];
1534 if (!cpp_opts->preprocessed && opt->code == OPT_include
1535 && cpp_push_include (parse_in, opt->arg))
1539 if (include_cursor == deferred_count)
1542 /* -Wunused-macros should only warn about macros defined hereafter. */
1543 cpp_opts->warn_unused_macros = warn_unused_macros;
1544 /* Restore the line map from <command line>. */
1545 if (!cpp_opts->preprocessed)
1546 cpp_change_file (parse_in, LC_RENAME, this_input_filename);
1548 /* Set this here so the client can change the option if it wishes,
1549 and after stacking the main file so we don't trace the main file. */
1550 line_table->trace_includes = cpp_opts->print_include_names;
1554 /* File change callback. Has to handle -include files. */
1556 cb_file_change (cpp_reader * ARG_UNUSED (pfile),
1557 const struct line_map *new_map)
1559 if (flag_preprocess_only)
1560 pp_file_change (new_map);
1562 fe_file_change (new_map);
1564 if (new_map == 0 || (new_map->reason == LC_LEAVE && MAIN_FILE_P (new_map)))
1565 push_command_line_include ();
1569 cb_dir_change (cpp_reader * ARG_UNUSED (pfile), const char *dir)
1571 if (!set_src_pwd (dir))
1572 warning (0, "too late for # directive to set debug directory");
1575 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1576 extensions if ISO). There is no concept of gnu94. */
1578 set_std_c89 (int c94, int iso)
1580 cpp_set_lang (parse_in, c94 ? CLK_STDC94: iso ? CLK_STDC89: CLK_GNUC89);
1583 flag_no_gnu_keywords = iso;
1584 flag_no_nonansi_builtin = iso;
1589 /* Set the C 99 standard (without GNU extensions if ISO). */
1591 set_std_c99 (int iso)
1593 cpp_set_lang (parse_in, iso ? CLK_STDC99: CLK_GNUC99);
1595 flag_no_nonansi_builtin = iso;
1601 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1603 set_std_cxx98 (int iso)
1605 cpp_set_lang (parse_in, iso ? CLK_CXX98: CLK_GNUCXX);
1606 flag_no_gnu_keywords = iso;
1607 flag_no_nonansi_builtin = iso;
1609 cxx_dialect = cxx98;
1612 /* Set the C++ 0x working draft "standard" (without GNU extensions if ISO). */
1614 set_std_cxx0x (int iso)
1616 cpp_set_lang (parse_in, iso ? CLK_CXX0X: CLK_GNUCXX0X);
1617 flag_no_gnu_keywords = iso;
1618 flag_no_nonansi_builtin = iso;
1620 cxx_dialect = cxx0x;
1623 /* Handle setting implicit to ON. */
1625 set_Wimplicit (int on)
1628 warn_implicit_int = on;
1629 warn_implicit_function_declaration = on;
1632 /* Args to -d specify what to dump. Silently ignore
1633 unrecognized options; they may be aimed at toplev.c. */
1635 handle_OPT_d (const char *arg)
1639 while ((c = *arg++) != '\0')
1642 case 'M': /* Dump macros only. */
1643 case 'N': /* Dump names. */
1644 case 'D': /* Dump definitions. */
1645 case 'U': /* Dump used macros. */
1646 flag_dump_macros = c;
1650 flag_dump_includes = 1;