1 /* C/ObjC/C++ command line option handling.
2 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
3 Free Software Foundation, Inc.
4 Contributed by Neil Booth.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
24 #include "coretypes.h"
31 #include "langhooks.h"
32 #include "tree-inline.h"
33 #include "diagnostic.h"
35 #include "cppdefault.h"
37 #include "debug.h" /* For debug_hooks. */
43 #include "c-tree.h" /* For c_cpp_error. */
45 #ifndef DOLLARS_IN_IDENTIFIERS
46 # define DOLLARS_IN_IDENTIFIERS true
49 #ifndef TARGET_SYSTEM_ROOT
50 # define TARGET_SYSTEM_ROOT NULL
54 #define TARGET_OPTF(ARG)
58 cpp_options *cpp_opts;
61 static const char *this_input_filename;
63 /* Filename and stream for preprocessed output. */
64 static const char *out_fname;
65 static FILE *out_stream;
67 /* Append dependencies to deps_file. */
68 static bool deps_append;
70 /* If dependency switches (-MF etc.) have been given. */
71 static bool deps_seen;
76 /* Dependency output file. */
77 static const char *deps_file;
79 /* The prefix given by -iprefix, if any. */
80 static const char *iprefix;
82 /* The multilib directory given by -imultilib, if any. */
83 static const char *imultilib;
85 /* The system root, if any. Overridden by -isysroot. */
86 static const char *sysroot = TARGET_SYSTEM_ROOT;
88 /* Zero disables all standard directories for headers. */
89 static bool std_inc = true;
91 /* Zero disables the C++-specific standard directories for headers. */
92 static bool std_cxx_inc = true;
94 /* If the quote chain has been split by -I-. */
95 static bool quote_chain_split;
97 /* If -Wunused-macros. */
98 static bool warn_unused_macros;
100 /* If -Wvariadic-macros. */
101 static bool warn_variadic_macros = true;
103 /* Number of deferred options. */
104 static size_t deferred_count;
106 /* Number of deferred options scanned for -include. */
107 static size_t include_cursor;
109 static void set_Wimplicit (int);
110 static void handle_OPT_d (const char *);
111 static void set_std_cxx98 (int);
112 static void set_std_cxx0x (int);
113 static void set_std_c89 (int, int);
114 static void set_std_c99 (int);
115 static void check_deps_environment_vars (void);
116 static void handle_deferred_opts (void);
117 static void sanitize_cpp_opts (void);
118 static void add_prefixed_path (const char *, size_t);
119 static void push_command_line_include (void);
120 static void cb_file_change (cpp_reader *, const struct line_map *);
121 static void cb_dir_change (cpp_reader *, const char *);
122 static void finish_options (void);
124 #ifndef STDC_0_IN_SYSTEM_HEADERS
125 #define STDC_0_IN_SYSTEM_HEADERS 0
128 /* Holds switches parsed by c_common_handle_option (), but whose
129 handling is deferred to c_common_post_options (). */
130 static void defer_opt (enum opt_code, const char *);
131 static struct deferred_opt
137 /* Complain that switch CODE expects an argument but none was
138 provided. OPT was the command-line option. Return FALSE to get
139 the default message in opts.c, TRUE if we provide a specialized
142 c_common_missing_argument (const char *opt, size_t code)
147 /* Pick up the default message. */
150 case OPT_fconstant_string_class_:
151 error ("no class name specified with %qs", opt);
155 error ("assertion missing after %qs", opt);
160 error ("macro name missing after %qs", opt);
169 error ("missing path after %qs", opt);
178 error ("missing filename after %qs", opt);
183 error ("missing makefile target after %qs", opt);
190 /* Defer option CODE with argument ARG. */
192 defer_opt (enum opt_code code, const char *arg)
194 deferred_opts[deferred_count].code = code;
195 deferred_opts[deferred_count].arg = arg;
199 /* Common initialization before parsing options. */
201 c_common_init_options (unsigned int argc, const char **argv)
203 static const unsigned int lang_flags[] = {CL_C, CL_ObjC, CL_CXX, CL_ObjCXX};
204 unsigned int i, result;
205 struct cpp_callbacks *cb;
207 /* This is conditionalized only because that is the way the front
208 ends used to do it. Maybe this should be unconditional? */
209 if (c_dialect_cxx ())
211 /* By default wrap lines at 80 characters. Is getenv
212 ("COLUMNS") preferable? */
213 diagnostic_line_cutoff (global_dc) = 80;
214 /* By default, emit location information once for every
215 diagnostic message. */
216 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
219 parse_in = cpp_create_reader (c_dialect_cxx () ? CLK_GNUCXX: CLK_GNUC89,
220 ident_hash, line_table);
221 cb = cpp_get_callbacks (parse_in);
222 cb->error = c_cpp_error;
224 cpp_opts = cpp_get_options (parse_in);
225 cpp_opts->dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
226 cpp_opts->objc = c_dialect_objc ();
228 /* Reset to avoid warnings on internal definitions. We set it just
229 before passing on command-line options to cpplib. */
230 cpp_opts->warn_dollars = 0;
232 flag_exceptions = c_dialect_cxx ();
233 warn_pointer_arith = c_dialect_cxx ();
234 warn_write_strings = c_dialect_cxx();
236 /* By default, C99-like requirements for complex multiply and divide. */
237 flag_complex_method = 2;
239 deferred_opts = XNEWVEC (struct deferred_opt, argc);
241 result = lang_flags[c_language];
243 if (c_language == clk_c)
245 /* If preprocessing assembly language, accept any of the C-family
246 front end options since the driver may pass them through. */
247 for (i = 1; i < argc; i++)
248 if (! strcmp (argv[i], "-lang-asm"))
250 result |= CL_C | CL_ObjC | CL_CXX | CL_ObjCXX;
258 /* Handle switch SCODE with argument ARG. VALUE is true, unless no-
259 form of an -f or -W option was given. Returns 0 if the switch was
260 invalid, a negative number to prevent language-independent
261 processing in toplev.c (a hack necessary for the short-term). */
263 c_common_handle_option (size_t scode, const char *arg, int value)
265 const struct cl_option *option = &cl_options[scode];
266 enum opt_code code = (enum opt_code) scode;
269 /* Prevent resetting the language standard to a C dialect when the driver
270 has already determined that we're looking at assembler input. */
271 bool preprocessing_asm_p = (cpp_get_options (parse_in)->lang == CLK_ASM);
276 if (cl_options[code].flags & (CL_C | CL_CXX | CL_ObjC | CL_ObjCXX))
278 if ((option->flags & CL_TARGET)
279 && ! targetcm.handle_c_option (scode, arg, value))
286 case OPT__output_pch_:
291 defer_opt (code, arg);
295 cpp_opts->discard_comments = 0;
299 cpp_opts->discard_comments = 0;
300 cpp_opts->discard_comments_in_macro_exp = 0;
304 defer_opt (code, arg);
308 flag_preprocess_only = 1;
312 cpp_opts->print_include_names = 1;
316 TARGET_OPTF (xstrdup (arg));
320 if (strcmp (arg, "-"))
321 add_path (xstrdup (arg), BRACKET, 0, true);
324 if (quote_chain_split)
325 error ("-I- specified twice");
326 quote_chain_split = true;
327 split_quote_chain ();
328 inform (input_location, "obsolete option -I- used, please use -iquote instead");
334 /* When doing dependencies with -M or -MM, suppress normal
335 preprocessed output, but still do -dM etc. as software
336 depends on this. Preprocessed output does occur if -MD, -MMD
337 or environment var dependency generation is used. */
338 cpp_opts->deps.style = (code == OPT_M ? DEPS_SYSTEM: DEPS_USER);
344 cpp_opts->deps.style = (code == OPT_MD ? DEPS_SYSTEM: DEPS_USER);
355 cpp_opts->deps.missing_files = true;
360 cpp_opts->deps.phony_targets = true;
366 defer_opt (code, arg);
370 flag_no_line_commands = 1;
373 case OPT_fworking_directory:
374 flag_working_directory = value;
378 defer_opt (code, arg);
384 set_Wimplicit (value);
385 warn_char_subscripts = value;
386 warn_missing_braces = value;
387 warn_parentheses = value;
388 warn_return_type = value;
389 warn_sequence_point = value; /* Was C only. */
391 if (warn_strict_aliasing == -1)
392 set_Wstrict_aliasing (value);
393 warn_address = value;
394 if (warn_strict_overflow == -1)
395 warn_strict_overflow = value;
396 warn_array_bounds = value;
397 warn_volatile_register_var = value;
399 /* Only warn about unknown pragmas that are not in system
401 warn_unknown_pragmas = value;
403 /* We save the value of warn_uninitialized, since if they put
404 -Wuninitialized on the command line, we need to generate a
405 warning about not using it without also specifying -O. */
406 if (warn_uninitialized != 1)
407 warn_uninitialized = (value ? 2 : 0);
409 if (!c_dialect_cxx ())
411 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding
412 can turn it off only if it's not explicit. */
414 warn_main = (value ? 2 : 0);
418 /* C++-specific warnings. */
419 warn_sign_compare = value;
420 warn_reorder = value;
421 warn_cxx0x_compat = value;
424 cpp_opts->warn_trigraphs = value;
425 cpp_opts->warn_comments = value;
426 cpp_opts->warn_num_sign_change = value;
428 if (warn_pointer_sign == -1)
429 warn_pointer_sign = value;
432 case OPT_Wbuiltin_macro_redefined:
433 cpp_opts->warn_builtin_macro_redefined = value;
438 cpp_opts->warn_comments = value;
441 case OPT_Wdeprecated:
442 cpp_opts->warn_deprecated = value;
445 case OPT_Wendif_labels:
446 cpp_opts->warn_endif_labels = value;
450 global_dc->warning_as_error_requested = value;
453 case OPT_Werror_implicit_function_declaration:
454 /* For backward compatibility, this is the same as
455 -Werror=implicit-function-declaration. */
456 enable_warning_as_error ("implicit-function-declaration", value, CL_C | CL_ObjC);
464 set_Wformat (atoi (arg));
468 set_Wimplicit (value);
472 /* Silently ignore for now. */
475 case OPT_Winvalid_pch:
476 cpp_opts->warn_invalid_pch = value;
479 case OPT_Wmissing_include_dirs:
480 cpp_opts->warn_missing_include_dirs = value;
484 cpp_opts->warn_multichar = value;
487 case OPT_Wnormalized_:
488 if (!value || (arg && strcasecmp (arg, "none") == 0))
489 cpp_opts->warn_normalize = normalized_none;
490 else if (!arg || strcasecmp (arg, "nfkc") == 0)
491 cpp_opts->warn_normalize = normalized_KC;
492 else if (strcasecmp (arg, "id") == 0)
493 cpp_opts->warn_normalize = normalized_identifier_C;
494 else if (strcasecmp (arg, "nfc") == 0)
495 cpp_opts->warn_normalize = normalized_C;
497 error ("argument %qs to %<-Wnormalized%> not recognized", arg);
500 case OPT_Wreturn_type:
501 warn_return_type = value;
504 case OPT_Wstrict_null_sentinel:
505 warn_strict_null_sentinel = value;
508 case OPT_Wtraditional:
509 cpp_opts->warn_traditional = value;
513 cpp_opts->warn_trigraphs = value;
517 cpp_opts->warn_undef = value;
520 case OPT_Wunknown_pragmas:
521 /* Set to greater than 1, so that even unknown pragmas in
522 system headers will be warned about. */
523 warn_unknown_pragmas = value * 2;
526 case OPT_Wunused_macros:
527 warn_unused_macros = value;
530 case OPT_Wvariadic_macros:
531 warn_variadic_macros = value;
534 case OPT_Wwrite_strings:
535 warn_write_strings = value;
541 warn_nonvdtor = true;
545 if (!c_dialect_cxx ())
546 set_std_c89 (false, true);
548 set_std_cxx98 (true);
555 case OPT_fcond_mismatch:
556 if (!c_dialect_cxx ())
558 flag_cond_mismatch = value;
563 case OPT_fall_virtual:
564 case OPT_falt_external_templates:
565 case OPT_fenum_int_equiv:
566 case OPT_fexternal_templates:
567 case OPT_fguiding_decls:
569 case OPT_fhuge_objects:
571 case OPT_fname_mangling_version_:
573 case OPT_fnonnull_objects:
575 case OPT_fstrict_prototype:
576 case OPT_fthis_is_variable:
577 case OPT_fvtable_thunks:
580 warning (0, "switch %qs is no longer supported", option->opt_text);
583 case OPT_faccess_control:
584 flag_access_control = value;
588 flag_no_asm = !value;
592 flag_no_builtin = !value;
599 disable_builtin_function (arg);
602 case OPT_fdirectives_only:
603 cpp_opts->directives_only = value;
606 case OPT_fdollars_in_identifiers:
607 cpp_opts->dollars_in_ident = value;
610 case OPT_ffreestanding:
612 /* Fall through.... */
615 flag_no_builtin = !value;
618 case OPT_fshort_double:
619 flag_short_double = value;
622 case OPT_fshort_enums:
623 flag_short_enums = value;
626 case OPT_fshort_wchar:
627 flag_short_wchar = value;
630 case OPT_fsigned_bitfields:
631 flag_signed_bitfields = value;
634 case OPT_fsigned_char:
635 flag_signed_char = value;
638 case OPT_funsigned_bitfields:
639 flag_signed_bitfields = !value;
642 case OPT_funsigned_char:
643 flag_signed_char = !value;
647 flag_check_new = value;
650 case OPT_fconserve_space:
651 flag_conserve_space = value;
654 case OPT_fconstant_string_class_:
655 constant_string_class_name = arg;
658 case OPT_fdefault_inline:
659 flag_default_inline = value;
662 case OPT_felide_constructors:
663 flag_elide_constructors = value;
666 case OPT_fenforce_eh_specs:
667 flag_enforce_eh_specs = value;
670 case OPT_fextended_identifiers:
671 cpp_opts->extended_identifiers = value;
675 flag_new_for_scope = value;
678 case OPT_fgnu_keywords:
679 flag_no_gnu_keywords = !value;
682 case OPT_fgnu_runtime:
683 flag_next_runtime = !value;
686 case OPT_fhandle_exceptions:
687 warning (0, "-fhandle-exceptions has been renamed -fexceptions (and is now on by default)");
688 flag_exceptions = value;
691 case OPT_fimplement_inlines:
692 flag_implement_inlines = value;
695 case OPT_fimplicit_inline_templates:
696 flag_implicit_inline_templates = value;
699 case OPT_fimplicit_templates:
700 flag_implicit_templates = value;
703 case OPT_flax_vector_conversions:
704 flag_lax_vector_conversions = value;
707 case OPT_fms_extensions:
708 flag_ms_extensions = value;
711 case OPT_fnext_runtime:
712 flag_next_runtime = value;
715 case OPT_fnil_receivers:
716 flag_nil_receivers = value;
719 case OPT_fnonansi_builtins:
720 flag_no_nonansi_builtin = !value;
723 case OPT_foperator_names:
724 cpp_opts->operator_names = value;
727 case OPT_foptional_diags:
728 flag_optional_diags = value;
732 cpp_opts->restore_pch_deps = value;
735 case OPT_fpch_preprocess:
736 flag_pch_preprocess = value;
739 case OPT_fpermissive:
740 flag_permissive = value;
743 case OPT_fpreprocessed:
744 cpp_opts->preprocessed = value;
747 case OPT_freplace_objc_classes:
748 flag_replace_objc_classes = value;
752 flag_use_repository = value;
754 flag_implicit_templates = 0;
761 case OPT_fshow_column:
762 cpp_opts->show_column = value;
766 flag_detailed_statistics = value;
770 /* It is documented that we silently ignore silly values. */
771 if (value >= 1 && value <= 100)
772 cpp_opts->tabstop = value;
775 case OPT_fexec_charset_:
776 cpp_opts->narrow_charset = arg;
779 case OPT_fwide_exec_charset_:
780 cpp_opts->wide_charset = arg;
783 case OPT_finput_charset_:
784 cpp_opts->input_charset = arg;
787 case OPT_ftemplate_depth_:
788 max_tinst_depth = value;
791 case OPT_fuse_cxa_atexit:
792 flag_use_cxa_atexit = value;
795 case OPT_fuse_cxa_get_exception_ptr:
796 flag_use_cxa_get_exception_ptr = value;
799 case OPT_fvisibility_inlines_hidden:
800 visibility_options.inlines_hidden = value;
807 case OPT_fthreadsafe_statics:
808 flag_threadsafe_statics = value;
812 flag_zero_link = value;
816 flag_gen_declaration = 1;
819 case OPT_femit_struct_debug_baseonly:
820 set_struct_debug_option ("base");
823 case OPT_femit_struct_debug_reduced:
824 set_struct_debug_option ("dir:ord:sys,dir:gen:any,ind:base");
827 case OPT_femit_struct_debug_detailed_:
828 set_struct_debug_option (arg);
832 add_path (xstrdup (arg), AFTER, 0, true);
837 defer_opt (code, arg);
849 add_path (xstrdup (arg), QUOTE, 0, true);
857 add_path (xstrdup (arg), SYSTEM, 0, true);
860 case OPT_iwithprefix:
861 add_prefixed_path (arg, SYSTEM);
864 case OPT_iwithprefixbefore:
865 add_prefixed_path (arg, BRACKET);
869 cpp_set_lang (parse_in, CLK_ASM);
870 cpp_opts->dollars_in_ident = false;
889 error ("output filename specified twice");
892 /* We need to handle the -pedantic switches here, rather than in
893 c_common_post_options, so that a subsequent -Wno-endif-labels
894 is not overridden. */
895 case OPT_pedantic_errors:
897 cpp_opts->pedantic = 1;
898 cpp_opts->warn_endif_labels = 1;
899 if (warn_pointer_sign == -1)
900 warn_pointer_sign = 1;
901 if (warn_overlength_strings == -1)
902 warn_overlength_strings = 1;
907 case OPT_print_objc_runtime_info:
908 print_struct_values = 1;
911 case OPT_print_pch_checksum:
912 c_common_print_pch_checksum (stdout);
913 exit_after_options = true;
921 case OPT_std_gnu__98:
922 if (!preprocessing_asm_p)
923 set_std_cxx98 (code == OPT_std_c__98 /* ISO */);
927 case OPT_std_gnu__0x:
928 if (!preprocessing_asm_p)
929 set_std_cxx0x (code == OPT_std_c__0x /* ISO */);
933 case OPT_std_iso9899_1990:
934 case OPT_std_iso9899_199409:
935 if (!preprocessing_asm_p)
936 set_std_c89 (code == OPT_std_iso9899_199409 /* c94 */, true /* ISO */);
940 if (!preprocessing_asm_p)
941 set_std_c89 (false /* c94 */, false /* ISO */);
946 case OPT_std_iso9899_1999:
947 case OPT_std_iso9899_199x:
948 if (!preprocessing_asm_p)
949 set_std_c99 (true /* ISO */);
954 if (!preprocessing_asm_p)
955 set_std_c99 (false /* ISO */);
959 cpp_opts->trigraphs = 1;
962 case OPT_traditional_cpp:
963 cpp_opts->traditional = 1;
982 /* Post-switch processing. */
984 c_common_post_options (const char **pfilename)
986 struct cpp_callbacks *cb;
988 /* Canonicalize the input and output filenames. */
989 if (in_fnames == NULL)
991 in_fnames = XNEWVEC (const char *, 1);
994 else if (strcmp (in_fnames[0], "-") == 0)
997 if (out_fname == NULL || !strcmp (out_fname, "-"))
1000 if (cpp_opts->deps.style == DEPS_NONE)
1001 check_deps_environment_vars ();
1003 handle_deferred_opts ();
1005 sanitize_cpp_opts ();
1007 register_include_chains (parse_in, sysroot, iprefix, imultilib,
1008 std_inc, std_cxx_inc && c_dialect_cxx (), verbose);
1010 #ifdef C_COMMON_OVERRIDE_OPTIONS
1011 /* Some machines may reject certain combinations of C
1012 language-specific options. */
1013 C_COMMON_OVERRIDE_OPTIONS;
1016 /* By default we use C99 inline semantics in GNU99 or C99 mode. C99
1017 inline semantics are not supported in GNU89 or C89 mode. */
1018 if (flag_gnu89_inline == -1)
1019 flag_gnu89_inline = !flag_isoc99;
1020 else if (!flag_gnu89_inline && !flag_isoc99)
1021 error ("-fno-gnu89-inline is only supported in GNU99 or C99 mode");
1023 /* Default to ObjC sjlj exception handling if NeXT runtime. */
1024 if (flag_objc_sjlj_exceptions < 0)
1025 flag_objc_sjlj_exceptions = flag_next_runtime;
1026 if (flag_objc_exceptions && !flag_objc_sjlj_exceptions)
1027 flag_exceptions = 1;
1029 /* -Wextra implies -Wtype-limits, -Wclobbered,
1030 -Wempty-body, -Wsign-compare,
1031 -Wmissing-field-initializers, -Wmissing-parameter-type
1032 -Wold-style-declaration, -Woverride-init and -Wignored-qualifiers
1033 but not if explicitly overridden. */
1034 if (warn_type_limits == -1)
1035 warn_type_limits = extra_warnings;
1036 if (warn_clobbered == -1)
1037 warn_clobbered = extra_warnings;
1038 if (warn_empty_body == -1)
1039 warn_empty_body = extra_warnings;
1040 if (warn_sign_compare == -1)
1041 warn_sign_compare = extra_warnings;
1042 if (warn_missing_field_initializers == -1)
1043 warn_missing_field_initializers = extra_warnings;
1044 if (warn_missing_parameter_type == -1)
1045 warn_missing_parameter_type = extra_warnings;
1046 if (warn_old_style_declaration == -1)
1047 warn_old_style_declaration = extra_warnings;
1048 if (warn_override_init == -1)
1049 warn_override_init = extra_warnings;
1050 if (warn_ignored_qualifiers == -1)
1051 warn_ignored_qualifiers = extra_warnings;
1053 /* -Wpointer-sign is disabled by default, but it is enabled if any
1054 of -Wall or -pedantic are given. */
1055 if (warn_pointer_sign == -1)
1056 warn_pointer_sign = 0;
1058 if (warn_strict_aliasing == -1)
1059 warn_strict_aliasing = 0;
1060 if (warn_strict_overflow == -1)
1061 warn_strict_overflow = 0;
1063 /* -Woverlength-strings is off by default, but is enabled by -pedantic.
1064 It is never enabled in C++, as the minimum limit is not normative
1065 in that standard. */
1066 if (warn_overlength_strings == -1 || c_dialect_cxx ())
1067 warn_overlength_strings = 0;
1069 /* Wmain is enabled by default in C++ but not in C. */
1070 /* Wmain is disabled by default for -ffreestanding (!flag_hosted),
1071 even if -Wall was given (warn_main will be 2 if set by -Wall, 1
1072 if set by -Wmain). */
1073 if (warn_main == -1)
1074 warn_main = (c_dialect_cxx () && flag_hosted) ? 1 : 0;
1075 else if (warn_main == 2)
1076 warn_main = flag_hosted ? 1 : 0;
1078 /* In C, -Wconversion enables -Wsign-conversion (unless disabled
1079 through -Wno-sign-conversion). While in C++,
1080 -Wsign-conversion needs to be requested explicitly. */
1081 if (warn_sign_conversion == -1)
1082 warn_sign_conversion = (c_dialect_cxx ()) ? 0 : warn_conversion;
1084 /* -Wpacked-bitfield-compat is on by default for the C languages. The
1085 warning is issued in stor-layout.c which is not part of the front-end so
1086 we need to selectively turn it on here. */
1087 if (warn_packed_bitfield_compat == -1)
1088 warn_packed_bitfield_compat = 1;
1090 /* Special format checking options don't work without -Wformat; warn if
1094 warning (OPT_Wformat_y2k,
1095 "-Wformat-y2k ignored without -Wformat");
1096 warning (OPT_Wformat_extra_args,
1097 "-Wformat-extra-args ignored without -Wformat");
1098 warning (OPT_Wformat_zero_length,
1099 "-Wformat-zero-length ignored without -Wformat");
1100 warning (OPT_Wformat_nonliteral,
1101 "-Wformat-nonliteral ignored without -Wformat");
1102 warning (OPT_Wformat_contains_nul,
1103 "-Wformat-contains-nul ignored without -Wformat");
1104 warning (OPT_Wformat_security,
1105 "-Wformat-security ignored without -Wformat");
1108 /* -Wimplicit-function-declaration is enabled by default for C99. */
1109 if (warn_implicit_function_declaration == -1)
1110 warn_implicit_function_declaration = flag_isoc99;
1112 /* If we're allowing C++0x constructs, don't warn about C++0x
1113 compatibility problems. */
1114 if (cxx_dialect == cxx0x)
1115 warn_cxx0x_compat = 0;
1117 if (flag_preprocess_only)
1119 /* Open the output now. We must do so even if flag_no_output is
1120 on, because there may be other output than from the actual
1121 preprocessing (e.g. from -dM). */
1122 if (out_fname[0] == '\0')
1123 out_stream = stdout;
1125 out_stream = fopen (out_fname, "w");
1127 if (out_stream == NULL)
1129 fatal_error ("opening output file %s: %m", out_fname);
1133 if (num_in_fnames > 1)
1134 error ("too many filenames given. Type %s --help for usage",
1137 init_pp_output (out_stream);
1143 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1144 input_location = UNKNOWN_LOCATION;
1147 cb = cpp_get_callbacks (parse_in);
1148 cb->file_change = cb_file_change;
1149 cb->dir_change = cb_dir_change;
1150 cpp_post_options (parse_in);
1152 input_location = UNKNOWN_LOCATION;
1154 *pfilename = this_input_filename
1155 = cpp_read_main_file (parse_in, in_fnames[0]);
1156 /* Don't do any compilation or preprocessing if there is no input file. */
1157 if (this_input_filename == NULL)
1163 if (flag_working_directory
1164 && flag_preprocess_only && !flag_no_line_commands)
1165 pp_dir_change (parse_in, get_src_pwd ());
1167 return flag_preprocess_only;
1170 /* Front end initialization common to C, ObjC and C++. */
1172 c_common_init (void)
1174 /* Set up preprocessor arithmetic. Must be done after call to
1175 c_common_nodes_and_builtins for type nodes to be good. */
1176 cpp_opts->precision = TYPE_PRECISION (intmax_type_node);
1177 cpp_opts->char_precision = TYPE_PRECISION (char_type_node);
1178 cpp_opts->int_precision = TYPE_PRECISION (integer_type_node);
1179 cpp_opts->wchar_precision = TYPE_PRECISION (wchar_type_node);
1180 cpp_opts->unsigned_wchar = TYPE_UNSIGNED (wchar_type_node);
1181 cpp_opts->bytes_big_endian = BYTES_BIG_ENDIAN;
1183 /* This can't happen until after wchar_precision and bytes_big_endian
1185 cpp_init_iconv (parse_in);
1188 c_common_print_pch_checksum (stderr);
1190 /* Has to wait until now so that cpplib has its hash table. */
1193 if (flag_preprocess_only)
1196 preprocess_file (parse_in);
1203 /* Initialize the integrated preprocessor after debug output has been
1204 initialized; loop over each input file. */
1206 c_common_parse_file (int set_yydebug)
1214 warning(0, "The C parser does not support -dy, option ignored");
1218 "The Objective-C parser does not support -dy, option ignored");
1221 warning(0, "The C++ parser does not support -dy, option ignored");
1225 "The Objective-C++ parser does not support -dy, option ignored");
1234 /* Start the main input file, if the debug writer wants it. */
1235 if (debug_hooks->start_end_main_source_file)
1236 (*debug_hooks->start_source_file) (0, this_input_filename);
1243 /* And end the main input file, if the debug writer wants it */
1244 if (debug_hooks->start_end_main_source_file)
1245 (*debug_hooks->end_source_file) (0);
1246 if (++i >= num_in_fnames)
1248 cpp_undef_all (parse_in);
1249 cpp_clear_file_cache (parse_in);
1251 = cpp_read_main_file (parse_in, in_fnames[i]);
1252 /* If an input file is missing, abandon further compilation.
1253 cpplib has issued a diagnostic. */
1254 if (!this_input_filename)
1259 /* Common finish hook for the C, ObjC and C++ front ends. */
1261 c_common_finish (void)
1263 FILE *deps_stream = NULL;
1265 /* Don't write the deps file if there are errors. */
1266 if (cpp_opts->deps.style != DEPS_NONE && errorcount == 0)
1268 /* If -M or -MM was seen without -MF, default output to the
1271 deps_stream = out_stream;
1274 deps_stream = fopen (deps_file, deps_append ? "a": "w");
1276 fatal_error ("opening dependency file %s: %m", deps_file);
1280 /* For performance, avoid tearing down cpplib's internal structures
1281 with cpp_destroy (). */
1282 cpp_finish (parse_in, deps_stream);
1284 if (deps_stream && deps_stream != out_stream
1285 && (ferror (deps_stream) || fclose (deps_stream)))
1286 fatal_error ("closing dependency file %s: %m", deps_file);
1288 if (out_stream && (ferror (out_stream) || fclose (out_stream)))
1289 fatal_error ("when writing output to %s: %m", out_fname);
1292 /* Either of two environment variables can specify output of
1293 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1294 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1295 and DEPS_TARGET is the target to mention in the deps. They also
1296 result in dependency information being appended to the output file
1297 rather than overwriting it, and like Sun's compiler
1298 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1300 check_deps_environment_vars (void)
1304 GET_ENVIRONMENT (spec, "DEPENDENCIES_OUTPUT");
1306 cpp_opts->deps.style = DEPS_USER;
1309 GET_ENVIRONMENT (spec, "SUNPRO_DEPENDENCIES");
1312 cpp_opts->deps.style = DEPS_SYSTEM;
1313 cpp_opts->deps.ignore_main_file = true;
1319 /* Find the space before the DEPS_TARGET, if there is one. */
1320 char *s = strchr (spec, ' ');
1323 /* Let the caller perform MAKE quoting. */
1324 defer_opt (OPT_MT, s + 1);
1328 /* Command line -MF overrides environment variables and default. */
1337 /* Handle deferred command line switches. */
1339 handle_deferred_opts (void)
1344 /* Avoid allocating the deps buffer if we don't need it.
1345 (This flag may be true without there having been -MT or -MQ
1346 options, but we'll still need the deps buffer.) */
1350 deps = cpp_get_deps (parse_in);
1352 for (i = 0; i < deferred_count; i++)
1354 struct deferred_opt *opt = &deferred_opts[i];
1356 if (opt->code == OPT_MT || opt->code == OPT_MQ)
1357 deps_add_target (deps, opt->arg, opt->code == OPT_MQ);
1361 /* These settings are appropriate for GCC, but not necessarily so for
1362 cpplib as a library. */
1364 sanitize_cpp_opts (void)
1366 /* If we don't know what style of dependencies to output, complain
1367 if any other dependency switches have been given. */
1368 if (deps_seen && cpp_opts->deps.style == DEPS_NONE)
1369 error ("to generate dependencies you must specify either -M or -MM");
1371 /* -dM and dependencies suppress normal output; do it here so that
1372 the last -d[MDN] switch overrides earlier ones. */
1373 if (flag_dump_macros == 'M')
1376 /* By default, -fdirectives-only implies -dD. This allows subsequent phases
1377 to perform proper macro expansion. */
1378 if (cpp_opts->directives_only && !cpp_opts->preprocessed && !flag_dump_macros)
1379 flag_dump_macros = 'D';
1381 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1382 -dM since at least glibc relies on -M -dM to work. */
1383 /* Also, flag_no_output implies flag_no_line_commands, always. */
1386 if (flag_dump_macros != 'M')
1387 flag_dump_macros = 0;
1388 flag_dump_includes = 0;
1389 flag_no_line_commands = 1;
1391 else if (cpp_opts->deps.missing_files)
1392 error ("-MG may only be used with -M or -MM");
1394 cpp_opts->unsigned_char = !flag_signed_char;
1395 cpp_opts->stdc_0_in_system_headers = STDC_0_IN_SYSTEM_HEADERS;
1397 /* We want -Wno-long-long to override -pedantic -std=non-c99
1398 and/or -Wtraditional, whatever the ordering. */
1399 cpp_opts->warn_long_long
1400 = warn_long_long && ((pedantic
1401 && (c_dialect_cxx ()
1402 ? cxx_dialect == cxx98
1404 || warn_traditional);
1406 /* Similarly with -Wno-variadic-macros. No check for c99 here, since
1407 this also turns off warnings about GCCs extension. */
1408 cpp_opts->warn_variadic_macros
1409 = warn_variadic_macros && (pedantic || warn_traditional);
1411 /* If we're generating preprocessor output, emit current directory
1412 if explicitly requested or if debugging information is enabled.
1413 ??? Maybe we should only do it for debugging formats that
1414 actually output the current directory? */
1415 if (flag_working_directory == -1)
1416 flag_working_directory = (debug_info_level != DINFO_LEVEL_NONE);
1418 if (cpp_opts->directives_only)
1420 if (warn_unused_macros)
1421 error ("-fdirectives-only is incompatible with -Wunused_macros");
1422 if (cpp_opts->traditional)
1423 error ("-fdirectives-only is incompatible with -traditional");
1427 /* Add include path with a prefix at the front of its name. */
1429 add_prefixed_path (const char *suffix, size_t chain)
1433 size_t prefix_len, suffix_len;
1435 suffix_len = strlen (suffix);
1436 prefix = iprefix ? iprefix : cpp_GCC_INCLUDE_DIR;
1437 prefix_len = iprefix ? strlen (iprefix) : cpp_GCC_INCLUDE_DIR_len;
1439 path = (char *) xmalloc (prefix_len + suffix_len + 1);
1440 memcpy (path, prefix, prefix_len);
1441 memcpy (path + prefix_len, suffix, suffix_len);
1442 path[prefix_len + suffix_len] = '\0';
1444 add_path (path, chain, 0, false);
1447 /* Handle -D, -U, -A, -imacros, and the first -include. */
1449 finish_options (void)
1451 if (!cpp_opts->preprocessed)
1455 cb_file_change (parse_in,
1456 linemap_add (line_table, LC_RENAME, 0,
1457 _("<built-in>"), 0));
1459 cpp_init_builtins (parse_in, flag_hosted);
1460 c_cpp_builtins (parse_in);
1462 /* We're about to send user input to cpplib, so make it warn for
1463 things that we previously (when we sent it internal definitions)
1464 told it to not warn.
1466 C99 permits implementation-defined characters in identifiers.
1467 The documented meaning of -std= is to turn off extensions that
1468 conflict with the specified standard, and since a strictly
1469 conforming program cannot contain a '$', we do not condition
1470 their acceptance on the -std= setting. */
1471 cpp_opts->warn_dollars = (cpp_opts->pedantic && !cpp_opts->c99);
1473 cb_file_change (parse_in,
1474 linemap_add (line_table, LC_RENAME, 0,
1475 _("<command-line>"), 0));
1477 for (i = 0; i < deferred_count; i++)
1479 struct deferred_opt *opt = &deferred_opts[i];
1481 if (opt->code == OPT_D)
1482 cpp_define (parse_in, opt->arg);
1483 else if (opt->code == OPT_U)
1484 cpp_undef (parse_in, opt->arg);
1485 else if (opt->code == OPT_A)
1487 if (opt->arg[0] == '-')
1488 cpp_unassert (parse_in, opt->arg + 1);
1490 cpp_assert (parse_in, opt->arg);
1494 /* Handle -imacros after -D and -U. */
1495 for (i = 0; i < deferred_count; i++)
1497 struct deferred_opt *opt = &deferred_opts[i];
1499 if (opt->code == OPT_imacros
1500 && cpp_push_include (parse_in, opt->arg))
1502 /* Disable push_command_line_include callback for now. */
1503 include_cursor = deferred_count + 1;
1504 cpp_scan_nooutput (parse_in);
1508 else if (cpp_opts->directives_only)
1509 cpp_init_special_builtins (parse_in);
1512 push_command_line_include ();
1515 /* Give CPP the next file given by -include, if any. */
1517 push_command_line_include (void)
1519 while (include_cursor < deferred_count)
1521 struct deferred_opt *opt = &deferred_opts[include_cursor++];
1523 if (!cpp_opts->preprocessed && opt->code == OPT_include
1524 && cpp_push_include (parse_in, opt->arg))
1528 if (include_cursor == deferred_count)
1531 /* -Wunused-macros should only warn about macros defined hereafter. */
1532 cpp_opts->warn_unused_macros = warn_unused_macros;
1533 /* Restore the line map from <command line>. */
1534 if (!cpp_opts->preprocessed)
1535 cpp_change_file (parse_in, LC_RENAME, this_input_filename);
1537 /* Set this here so the client can change the option if it wishes,
1538 and after stacking the main file so we don't trace the main file. */
1539 line_table->trace_includes = cpp_opts->print_include_names;
1543 /* File change callback. Has to handle -include files. */
1545 cb_file_change (cpp_reader * ARG_UNUSED (pfile),
1546 const struct line_map *new_map)
1548 if (flag_preprocess_only)
1549 pp_file_change (new_map);
1551 fe_file_change (new_map);
1553 if (new_map == 0 || (new_map->reason == LC_LEAVE && MAIN_FILE_P (new_map)))
1554 push_command_line_include ();
1558 cb_dir_change (cpp_reader * ARG_UNUSED (pfile), const char *dir)
1560 if (!set_src_pwd (dir))
1561 warning (0, "too late for # directive to set debug directory");
1564 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1565 extensions if ISO). There is no concept of gnu94. */
1567 set_std_c89 (int c94, int iso)
1569 cpp_set_lang (parse_in, c94 ? CLK_STDC94: iso ? CLK_STDC89: CLK_GNUC89);
1572 flag_no_gnu_keywords = iso;
1573 flag_no_nonansi_builtin = iso;
1578 /* Set the C 99 standard (without GNU extensions if ISO). */
1580 set_std_c99 (int iso)
1582 cpp_set_lang (parse_in, iso ? CLK_STDC99: CLK_GNUC99);
1584 flag_no_nonansi_builtin = iso;
1590 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1592 set_std_cxx98 (int iso)
1594 cpp_set_lang (parse_in, iso ? CLK_CXX98: CLK_GNUCXX);
1595 flag_no_gnu_keywords = iso;
1596 flag_no_nonansi_builtin = iso;
1598 cxx_dialect = cxx98;
1601 /* Set the C++ 0x working draft "standard" (without GNU extensions if ISO). */
1603 set_std_cxx0x (int iso)
1605 cpp_set_lang (parse_in, iso ? CLK_CXX0X: CLK_GNUCXX0X);
1606 flag_no_gnu_keywords = iso;
1607 flag_no_nonansi_builtin = iso;
1609 cxx_dialect = cxx0x;
1612 /* Handle setting implicit to ON. */
1614 set_Wimplicit (int on)
1617 warn_implicit_int = on;
1618 warn_implicit_function_declaration = on;
1621 /* Args to -d specify what to dump. Silently ignore
1622 unrecognized options; they may be aimed at toplev.c. */
1624 handle_OPT_d (const char *arg)
1628 while ((c = *arg++) != '\0')
1631 case 'M': /* Dump macros only. */
1632 case 'N': /* Dump names. */
1633 case 'D': /* Dump definitions. */
1634 case 'U': /* Dump used macros. */
1635 flag_dump_macros = c;
1639 flag_dump_includes = 1;