1 /* C/ObjC/C++ command line option handling.
2 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
3 Free Software Foundation, Inc.
4 Contributed by Neil Booth.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
24 #include "coretypes.h"
30 #include "langhooks.h"
31 #include "diagnostic.h"
33 #include "cppdefault.h"
35 #include "debug.h" /* For debug_hooks. */
39 #include "target.h" /* For gcc_targetcm. */
41 #ifndef DOLLARS_IN_IDENTIFIERS
42 # define DOLLARS_IN_IDENTIFIERS true
45 #ifndef TARGET_SYSTEM_ROOT
46 # define TARGET_SYSTEM_ROOT NULL
50 #define TARGET_OPTF(ARG)
54 cpp_options *cpp_opts;
57 static const char *this_input_filename;
59 /* Filename and stream for preprocessed output. */
60 static const char *out_fname;
61 static FILE *out_stream;
63 /* Append dependencies to deps_file. */
64 static bool deps_append;
66 /* If dependency switches (-MF etc.) have been given. */
67 static bool deps_seen;
72 /* Dependency output file. */
73 static const char *deps_file;
75 /* The prefix given by -iprefix, if any. */
76 static const char *iprefix;
78 /* The multilib directory given by -imultilib, if any. */
79 static const char *imultilib;
81 /* The system root, if any. Overridden by -isysroot. */
82 static const char *sysroot = TARGET_SYSTEM_ROOT;
84 /* Zero disables all standard directories for headers. */
85 static bool std_inc = true;
87 /* Zero disables the C++-specific standard directories for headers. */
88 static bool std_cxx_inc = true;
90 /* If the quote chain has been split by -I-. */
91 static bool quote_chain_split;
93 /* If -Wunused-macros. */
94 static bool warn_unused_macros;
96 /* If -Wvariadic-macros. */
97 static bool warn_variadic_macros = true;
99 /* Number of deferred options. */
100 static size_t deferred_count;
102 /* Number of deferred options scanned for -include. */
103 static size_t include_cursor;
105 static void handle_OPT_d (const char *);
106 static void set_std_cxx98 (int);
107 static void set_std_cxx0x (int);
108 static void set_std_c89 (int, int);
109 static void set_std_c99 (int);
110 static void set_std_c1x (int);
111 static void check_deps_environment_vars (void);
112 static void handle_deferred_opts (void);
113 static void sanitize_cpp_opts (void);
114 static void add_prefixed_path (const char *, size_t);
115 static void push_command_line_include (void);
116 static void cb_file_change (cpp_reader *, const struct line_map *);
117 static void cb_dir_change (cpp_reader *, const char *);
118 static void finish_options (void);
120 #ifndef STDC_0_IN_SYSTEM_HEADERS
121 #define STDC_0_IN_SYSTEM_HEADERS 0
124 /* Holds switches parsed by c_common_handle_option (), but whose
125 handling is deferred to c_common_post_options (). */
126 static void defer_opt (enum opt_code, const char *);
127 static struct deferred_opt
134 static const unsigned int
135 c_family_lang_mask = (CL_C | CL_CXX | CL_ObjC | CL_ObjCXX);
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 /* -Werror= may set a warning option to enable a warning that is emitted
200 by the preprocessor. Set any corresponding flag in cpp_opts. */
203 warning_as_error_callback (int option_index)
205 switch (option_index)
208 /* Ignore options not associated with the preprocessor. */
211 case OPT_Wdeprecated:
212 cpp_opts->warn_deprecated = 1;
217 cpp_opts->warn_comments = 1;
221 cpp_opts->warn_trigraphs = 1;
225 cpp_opts->warn_multichar = 1;
228 case OPT_Wtraditional:
229 cpp_opts->warn_traditional = 1;
233 cpp_opts->warn_long_long = 1;
236 case OPT_Wendif_labels:
237 cpp_opts->warn_endif_labels = 1;
240 case OPT_Wvariadic_macros:
241 /* Set the local flag that is used later to update cpp_opts. */
242 warn_variadic_macros = 1;
245 case OPT_Wbuiltin_macro_redefined:
246 cpp_opts->warn_builtin_macro_redefined = 1;
250 cpp_opts->warn_undef = 1;
253 case OPT_Wunused_macros:
254 /* Set the local flag that is used later to update cpp_opts. */
255 warn_unused_macros = 1;
258 case OPT_Wc___compat:
259 /* Add warnings in the same way as c_common_handle_option below. */
260 if (warn_enum_compare == -1)
261 warn_enum_compare = 1;
262 if (warn_jump_misses_init == -1)
263 warn_jump_misses_init = 1;
264 cpp_opts->warn_cxx_operator_names = 1;
267 case OPT_Wnormalized_:
268 inform (input_location, "-Werror=normalized=: Set -Wnormalized=nfc");
269 cpp_opts->warn_normalize = normalized_C;
272 case OPT_Winvalid_pch:
273 cpp_opts->warn_invalid_pch = 1;
277 /* Handled by standard diagnostics using the option's associated
283 /* Common initialization before parsing options. */
285 c_common_init_options (unsigned int argc, const char **argv)
287 static const unsigned int lang_flags[] = {CL_C, CL_ObjC, CL_CXX, CL_ObjCXX};
288 unsigned int i, result;
289 struct cpp_callbacks *cb;
291 /* Register callback for warnings enabled by -Werror=. */
292 register_warning_as_error_callback (warning_as_error_callback);
294 /* This is conditionalized only because that is the way the front
295 ends used to do it. Maybe this should be unconditional? */
296 if (c_dialect_cxx ())
298 /* By default wrap lines at 80 characters. Is getenv
299 ("COLUMNS") preferable? */
300 diagnostic_line_cutoff (global_dc) = 80;
301 /* By default, emit location information once for every
302 diagnostic message. */
303 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
306 global_dc->opt_permissive = OPT_fpermissive;
308 parse_in = cpp_create_reader (c_dialect_cxx () ? CLK_GNUCXX: CLK_GNUC89,
309 ident_hash, line_table);
310 cb = cpp_get_callbacks (parse_in);
311 cb->error = c_cpp_error;
313 cpp_opts = cpp_get_options (parse_in);
314 cpp_opts->dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
315 cpp_opts->objc = c_dialect_objc ();
317 /* Reset to avoid warnings on internal definitions. We set it just
318 before passing on command-line options to cpplib. */
319 cpp_opts->warn_dollars = 0;
321 flag_exceptions = c_dialect_cxx ();
322 warn_pointer_arith = c_dialect_cxx ();
323 warn_write_strings = c_dialect_cxx();
324 flag_warn_unused_result = true;
326 /* By default, C99-like requirements for complex multiply and divide. */
327 flag_complex_method = 2;
329 deferred_opts = XNEWVEC (struct deferred_opt, argc);
331 result = lang_flags[c_language];
333 if (c_language == clk_c)
335 /* If preprocessing assembly language, accept any of the C-family
336 front end options since the driver may pass them through. */
337 for (i = 1; i < argc; i++)
338 if (! strcmp (argv[i], "-lang-asm"))
340 result |= CL_C | CL_ObjC | CL_CXX | CL_ObjCXX;
348 /* Handle switch SCODE with argument ARG. VALUE is true, unless no-
349 form of an -f or -W option was given. Returns 0 if the switch was
350 invalid, a negative number to prevent language-independent
351 processing in toplev.c (a hack necessary for the short-term). */
353 c_common_handle_option (size_t scode, const char *arg, int value,
356 const struct cl_option *option = &cl_options[scode];
357 enum opt_code code = (enum opt_code) scode;
360 /* Prevent resetting the language standard to a C dialect when the driver
361 has already determined that we're looking at assembler input. */
362 bool preprocessing_asm_p = (cpp_get_options (parse_in)->lang == CLK_ASM);
367 if (cl_options[code].flags & c_family_lang_mask)
369 if ((option->flags & CL_TARGET)
370 && ! targetcm.handle_c_option (scode, arg, value))
377 case OPT__output_pch_:
382 defer_opt (code, arg);
386 cpp_opts->discard_comments = 0;
390 cpp_opts->discard_comments = 0;
391 cpp_opts->discard_comments_in_macro_exp = 0;
395 defer_opt (code, arg);
399 cpp_opts->print_include_names = 1;
403 TARGET_OPTF (xstrdup (arg));
407 if (strcmp (arg, "-"))
408 add_path (xstrdup (arg), BRACKET, 0, true);
411 if (quote_chain_split)
412 error ("-I- specified twice");
413 quote_chain_split = true;
414 split_quote_chain ();
415 inform (input_location, "obsolete option -I- used, please use -iquote instead");
421 /* When doing dependencies with -M or -MM, suppress normal
422 preprocessed output, but still do -dM etc. as software
423 depends on this. Preprocessed output does occur if -MD, -MMD
424 or environment var dependency generation is used. */
425 cpp_opts->deps.style = (code == OPT_M ? DEPS_SYSTEM: DEPS_USER);
431 cpp_opts->deps.style = (code == OPT_MD ? DEPS_SYSTEM: DEPS_USER);
432 cpp_opts->deps.need_preprocessor_output = true;
443 cpp_opts->deps.missing_files = true;
448 cpp_opts->deps.phony_targets = true;
454 defer_opt (code, arg);
458 flag_no_line_commands = 1;
462 defer_opt (code, arg);
468 handle_option (OPT_Wimplicit, value, NULL, c_family_lang_mask, kind);
469 warn_char_subscripts = value;
470 warn_missing_braces = value;
471 warn_parentheses = value;
472 warn_return_type = value;
473 warn_sequence_point = value; /* Was C only. */
475 if (warn_strict_aliasing == -1)
476 set_Wstrict_aliasing (value);
477 warn_address = value;
478 if (warn_strict_overflow == -1)
479 warn_strict_overflow = value;
480 warn_array_bounds = value;
481 warn_volatile_register_var = value;
483 /* Only warn about unknown pragmas that are not in system
485 warn_unknown_pragmas = value;
487 warn_uninitialized = value;
489 if (!c_dialect_cxx ())
491 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding
492 can turn it off only if it's not explicit. */
494 warn_main = (value ? 2 : 0);
496 /* In C, -Wall turns on -Wenum-compare, which we do here.
497 In C++ it is on by default, which is done in
498 c_common_post_options. */
499 if (warn_enum_compare == -1)
500 warn_enum_compare = value;
504 /* C++-specific warnings. */
505 warn_sign_compare = value;
506 warn_reorder = value;
507 warn_cxx0x_compat = value;
510 cpp_opts->warn_trigraphs = value;
511 cpp_opts->warn_comments = value;
512 cpp_opts->warn_num_sign_change = value;
514 if (warn_pointer_sign == -1)
515 warn_pointer_sign = value;
518 case OPT_Wbuiltin_macro_redefined:
519 cpp_opts->warn_builtin_macro_redefined = value;
524 cpp_opts->warn_comments = value;
527 case OPT_Wc___compat:
528 /* Because -Wenum-compare is the default in C++, -Wc++-compat
529 implies -Wenum-compare. */
530 if (warn_enum_compare == -1 && value)
531 warn_enum_compare = value;
532 /* Because C++ always warns about a goto which misses an
533 initialization, -Wc++-compat turns on -Wjump-misses-init. */
534 if (warn_jump_misses_init == -1 && value)
535 warn_jump_misses_init = value;
536 cpp_opts->warn_cxx_operator_names = value;
539 case OPT_Wdeprecated:
540 cpp_opts->warn_deprecated = value;
543 case OPT_Wendif_labels:
544 cpp_opts->warn_endif_labels = value;
548 global_dc->warning_as_error_requested = value;
551 case OPT_Werror_implicit_function_declaration:
552 /* For backward compatibility, this is the same as
553 -Werror=implicit-function-declaration. */
554 enable_warning_as_error ("implicit-function-declaration", value, CL_C | CL_ObjC);
562 set_Wformat (atoi (arg));
566 gcc_assert (value == 0 || value == 1);
567 if (warn_implicit_int == -1)
568 handle_option (OPT_Wimplicit_int, value, NULL,
569 c_family_lang_mask, kind);
570 if (warn_implicit_function_declaration == -1)
571 handle_option (OPT_Wimplicit_function_declaration, value, NULL,
572 c_family_lang_mask, kind);
576 /* Silently ignore for now. */
579 case OPT_Winvalid_pch:
580 cpp_opts->warn_invalid_pch = value;
583 case OPT_Wmissing_include_dirs:
584 cpp_opts->warn_missing_include_dirs = value;
588 cpp_opts->warn_multichar = value;
591 case OPT_Wnormalized_:
592 if (!value || (arg && strcasecmp (arg, "none") == 0))
593 cpp_opts->warn_normalize = normalized_none;
594 else if (!arg || strcasecmp (arg, "nfkc") == 0)
595 cpp_opts->warn_normalize = normalized_KC;
596 else if (strcasecmp (arg, "id") == 0)
597 cpp_opts->warn_normalize = normalized_identifier_C;
598 else if (strcasecmp (arg, "nfc") == 0)
599 cpp_opts->warn_normalize = normalized_C;
601 error ("argument %qs to %<-Wnormalized%> not recognized", arg);
604 case OPT_Wreturn_type:
605 warn_return_type = value;
608 case OPT_Wtraditional:
609 cpp_opts->warn_traditional = value;
613 cpp_opts->warn_trigraphs = value;
617 cpp_opts->warn_undef = value;
620 case OPT_Wunknown_pragmas:
621 /* Set to greater than 1, so that even unknown pragmas in
622 system headers will be warned about. */
623 warn_unknown_pragmas = value * 2;
626 case OPT_Wunused_macros:
627 warn_unused_macros = value;
630 case OPT_Wvariadic_macros:
631 warn_variadic_macros = value;
634 case OPT_Wwrite_strings:
635 warn_write_strings = value;
641 warn_nonvdtor = true;
645 if (!c_dialect_cxx ())
646 set_std_c89 (false, true);
648 set_std_cxx98 (true);
655 case OPT_fcond_mismatch:
656 if (!c_dialect_cxx ())
658 flag_cond_mismatch = value;
663 case OPT_fall_virtual:
664 case OPT_falt_external_templates:
665 case OPT_fenum_int_equiv:
666 case OPT_fexternal_templates:
667 case OPT_fguiding_decls:
669 case OPT_fhuge_objects:
671 case OPT_fname_mangling_version_:
673 case OPT_fnonnull_objects:
675 case OPT_fstrict_prototype:
676 case OPT_fthis_is_variable:
677 case OPT_fvtable_thunks:
680 warning (0, "switch %qs is no longer supported", option->opt_text);
687 disable_builtin_function (arg);
690 case OPT_fdirectives_only:
691 cpp_opts->directives_only = value;
694 case OPT_fdollars_in_identifiers:
695 cpp_opts->dollars_in_ident = value;
698 case OPT_ffreestanding:
700 /* Fall through.... */
703 flag_no_builtin = !value;
706 case OPT_fconstant_string_class_:
707 constant_string_class_name = arg;
710 case OPT_fdefault_inline:
714 case OPT_fextended_identifiers:
715 cpp_opts->extended_identifiers = value;
718 case OPT_fgnu_runtime:
719 flag_next_runtime = !value;
722 case OPT_fhandle_exceptions:
723 warning (0, "-fhandle-exceptions has been renamed -fexceptions (and is now on by default)");
724 flag_exceptions = value;
727 case OPT_fnext_runtime:
728 flag_next_runtime = value;
731 case OPT_foperator_names:
732 cpp_opts->operator_names = value;
735 case OPT_foptional_diags:
740 cpp_opts->restore_pch_deps = value;
743 case OPT_fpch_preprocess:
744 flag_pch_preprocess = value;
747 case OPT_fpermissive:
748 flag_permissive = value;
749 global_dc->permissive = value;
752 case OPT_fpreprocessed:
753 cpp_opts->preprocessed = value;
757 flag_use_repository = value;
759 flag_implicit_templates = 0;
762 case OPT_fshow_column:
763 cpp_opts->show_column = value;
767 /* It is documented that we silently ignore silly values. */
768 if (value >= 1 && value <= 100)
769 cpp_opts->tabstop = value;
772 case OPT_fexec_charset_:
773 cpp_opts->narrow_charset = arg;
776 case OPT_fwide_exec_charset_:
777 cpp_opts->wide_charset = arg;
780 case OPT_finput_charset_:
781 cpp_opts->input_charset = arg;
784 case OPT_ftemplate_depth_:
785 /* Kept for backwards compatibility. */
786 case OPT_ftemplate_depth_eq:
787 max_tinst_depth = value;
790 case OPT_fvisibility_inlines_hidden:
791 visibility_options.inlines_hidden = value;
794 case OPT_femit_struct_debug_baseonly:
795 set_struct_debug_option ("base");
798 case OPT_femit_struct_debug_reduced:
799 set_struct_debug_option ("dir:ord:sys,dir:gen:any,ind:base");
802 case OPT_femit_struct_debug_detailed_:
803 set_struct_debug_option (arg);
807 add_path (xstrdup (arg), AFTER, 0, true);
812 defer_opt (code, arg);
824 add_path (xstrdup (arg), QUOTE, 0, true);
832 add_path (xstrdup (arg), SYSTEM, 0, true);
835 case OPT_iwithprefix:
836 add_prefixed_path (arg, SYSTEM);
839 case OPT_iwithprefixbefore:
840 add_prefixed_path (arg, BRACKET);
844 cpp_set_lang (parse_in, CLK_ASM);
845 cpp_opts->dollars_in_ident = false;
864 error ("output filename specified twice");
867 /* We need to handle the -pedantic switches here, rather than in
868 c_common_post_options, so that a subsequent -Wno-endif-labels
869 is not overridden. */
870 case OPT_pedantic_errors:
872 cpp_opts->pedantic = 1;
873 cpp_opts->warn_endif_labels = 1;
874 if (warn_pointer_sign == -1)
875 warn_pointer_sign = 1;
876 if (warn_overlength_strings == -1)
877 warn_overlength_strings = 1;
882 case OPT_print_objc_runtime_info:
883 print_struct_values = 1;
886 case OPT_print_pch_checksum:
887 c_common_print_pch_checksum (stdout);
888 exit_after_options = true;
896 case OPT_std_gnu__98:
897 if (!preprocessing_asm_p)
898 set_std_cxx98 (code == OPT_std_c__98 /* ISO */);
902 case OPT_std_gnu__0x:
903 if (!preprocessing_asm_p)
904 set_std_cxx0x (code == OPT_std_c__0x /* ISO */);
909 case OPT_std_iso9899_1990:
910 case OPT_std_iso9899_199409:
911 if (!preprocessing_asm_p)
912 set_std_c89 (code == OPT_std_iso9899_199409 /* c94 */, true /* ISO */);
917 if (!preprocessing_asm_p)
918 set_std_c89 (false /* c94 */, false /* ISO */);
923 case OPT_std_iso9899_1999:
924 case OPT_std_iso9899_199x:
925 if (!preprocessing_asm_p)
926 set_std_c99 (true /* ISO */);
931 if (!preprocessing_asm_p)
932 set_std_c99 (false /* ISO */);
936 if (!preprocessing_asm_p)
937 set_std_c1x (true /* ISO */);
941 if (!preprocessing_asm_p)
942 set_std_c1x (false /* ISO */);
946 cpp_opts->trigraphs = 1;
949 case OPT_traditional_cpp:
950 cpp_opts->traditional = 1;
965 /* Post-switch processing. */
967 c_common_post_options (const char **pfilename)
969 struct cpp_callbacks *cb;
971 /* Canonicalize the input and output filenames. */
972 if (in_fnames == NULL)
974 in_fnames = XNEWVEC (const char *, 1);
977 else if (strcmp (in_fnames[0], "-") == 0)
980 if (out_fname == NULL || !strcmp (out_fname, "-"))
983 if (cpp_opts->deps.style == DEPS_NONE)
984 check_deps_environment_vars ();
986 handle_deferred_opts ();
988 sanitize_cpp_opts ();
990 register_include_chains (parse_in, sysroot, iprefix, imultilib,
991 std_inc, std_cxx_inc && c_dialect_cxx (), verbose);
993 #ifdef C_COMMON_OVERRIDE_OPTIONS
994 /* Some machines may reject certain combinations of C
995 language-specific options. */
996 C_COMMON_OVERRIDE_OPTIONS;
999 /* Excess precision other than "fast" requires front-end
1001 if (c_dialect_cxx ())
1003 if (flag_excess_precision_cmdline == EXCESS_PRECISION_STANDARD
1004 && TARGET_FLT_EVAL_METHOD_NON_DEFAULT)
1005 sorry ("-fexcess-precision=standard for C++");
1006 flag_excess_precision_cmdline = EXCESS_PRECISION_FAST;
1008 else if (flag_excess_precision_cmdline == EXCESS_PRECISION_DEFAULT)
1009 flag_excess_precision_cmdline = (flag_iso
1010 ? EXCESS_PRECISION_STANDARD
1011 : EXCESS_PRECISION_FAST);
1013 /* By default we use C99 inline semantics in GNU99 or C99 mode. C99
1014 inline semantics are not supported in GNU89 or C89 mode. */
1015 if (flag_gnu89_inline == -1)
1016 flag_gnu89_inline = !flag_isoc99;
1017 else if (!flag_gnu89_inline && !flag_isoc99)
1018 error ("-fno-gnu89-inline is only supported in GNU99 or C99 mode");
1020 /* Default to ObjC sjlj exception handling if NeXT runtime. */
1021 if (flag_objc_sjlj_exceptions < 0)
1022 flag_objc_sjlj_exceptions = flag_next_runtime;
1023 if (flag_objc_exceptions && !flag_objc_sjlj_exceptions)
1024 flag_exceptions = 1;
1026 /* -Wextra implies the following flags
1027 unless explicitly overridden. */
1028 if (warn_type_limits == -1)
1029 warn_type_limits = extra_warnings;
1030 if (warn_clobbered == -1)
1031 warn_clobbered = extra_warnings;
1032 if (warn_empty_body == -1)
1033 warn_empty_body = extra_warnings;
1034 if (warn_sign_compare == -1)
1035 warn_sign_compare = extra_warnings;
1036 if (warn_missing_field_initializers == -1)
1037 warn_missing_field_initializers = extra_warnings;
1038 if (warn_missing_parameter_type == -1)
1039 warn_missing_parameter_type = extra_warnings;
1040 if (warn_old_style_declaration == -1)
1041 warn_old_style_declaration = extra_warnings;
1042 if (warn_override_init == -1)
1043 warn_override_init = extra_warnings;
1044 if (warn_ignored_qualifiers == -1)
1045 warn_ignored_qualifiers = extra_warnings;
1047 /* -Wpointer-sign is disabled by default, but it is enabled if any
1048 of -Wall or -pedantic are given. */
1049 if (warn_pointer_sign == -1)
1050 warn_pointer_sign = 0;
1052 if (warn_strict_aliasing == -1)
1053 warn_strict_aliasing = 0;
1054 if (warn_strict_overflow == -1)
1055 warn_strict_overflow = 0;
1056 if (warn_jump_misses_init == -1)
1057 warn_jump_misses_init = 0;
1059 /* -Woverlength-strings is off by default, but is enabled by -pedantic.
1060 It is never enabled in C++, as the minimum limit is not normative
1061 in that standard. */
1062 if (warn_overlength_strings == -1 || c_dialect_cxx ())
1063 warn_overlength_strings = 0;
1065 /* Wmain is enabled by default in C++ but not in C. */
1066 /* Wmain is disabled by default for -ffreestanding (!flag_hosted),
1067 even if -Wall was given (warn_main will be 2 if set by -Wall, 1
1068 if set by -Wmain). */
1069 if (warn_main == -1)
1070 warn_main = (c_dialect_cxx () && flag_hosted) ? 1 : 0;
1071 else if (warn_main == 2)
1072 warn_main = flag_hosted ? 1 : 0;
1074 /* In C, -Wconversion enables -Wsign-conversion (unless disabled
1075 through -Wno-sign-conversion). While in C++,
1076 -Wsign-conversion needs to be requested explicitly. */
1077 if (warn_sign_conversion == -1)
1078 warn_sign_conversion = (c_dialect_cxx ()) ? 0 : warn_conversion;
1080 /* In C, -Wall and -Wc++-compat enable -Wenum-compare, which we do
1081 in c_common_handle_option; if it has not yet been set, it is
1082 disabled by default. In C++, it is enabled by default. */
1083 if (warn_enum_compare == -1)
1084 warn_enum_compare = c_dialect_cxx () ? 1 : 0;
1086 /* -Wpacked-bitfield-compat is on by default for the C languages. The
1087 warning is issued in stor-layout.c which is not part of the front-end so
1088 we need to selectively turn it on here. */
1089 if (warn_packed_bitfield_compat == -1)
1090 warn_packed_bitfield_compat = 1;
1092 /* Special format checking options don't work without -Wformat; warn if
1096 warning (OPT_Wformat_y2k,
1097 "-Wformat-y2k ignored without -Wformat");
1098 warning (OPT_Wformat_extra_args,
1099 "-Wformat-extra-args ignored without -Wformat");
1100 warning (OPT_Wformat_zero_length,
1101 "-Wformat-zero-length ignored without -Wformat");
1102 warning (OPT_Wformat_nonliteral,
1103 "-Wformat-nonliteral ignored without -Wformat");
1104 warning (OPT_Wformat_contains_nul,
1105 "-Wformat-contains-nul ignored without -Wformat");
1106 warning (OPT_Wformat_security,
1107 "-Wformat-security ignored without -Wformat");
1110 if (warn_implicit == -1)
1113 if (warn_implicit_int == -1)
1114 warn_implicit_int = 0;
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 *pfilename = this_input_filename
1163 = cpp_read_main_file (parse_in, in_fnames[0]);
1164 /* Don't do any compilation or preprocessing if there is no input file. */
1165 if (this_input_filename == NULL)
1171 if (flag_working_directory
1172 && flag_preprocess_only && !flag_no_line_commands)
1173 pp_dir_change (parse_in, get_src_pwd ());
1175 return flag_preprocess_only;
1178 /* Front end initialization common to C, ObjC and C++. */
1180 c_common_init (void)
1182 /* Set up preprocessor arithmetic. Must be done after call to
1183 c_common_nodes_and_builtins for type nodes to be good. */
1184 cpp_opts->precision = TYPE_PRECISION (intmax_type_node);
1185 cpp_opts->char_precision = TYPE_PRECISION (char_type_node);
1186 cpp_opts->int_precision = TYPE_PRECISION (integer_type_node);
1187 cpp_opts->wchar_precision = TYPE_PRECISION (wchar_type_node);
1188 cpp_opts->unsigned_wchar = TYPE_UNSIGNED (wchar_type_node);
1189 cpp_opts->bytes_big_endian = BYTES_BIG_ENDIAN;
1191 /* This can't happen until after wchar_precision and bytes_big_endian
1193 cpp_init_iconv (parse_in);
1196 c_common_print_pch_checksum (stderr);
1198 /* Has to wait until now so that cpplib has its hash table. */
1201 if (flag_preprocess_only)
1204 preprocess_file (parse_in);
1211 /* Initialize the integrated preprocessor after debug output has been
1212 initialized; loop over each input file. */
1214 c_common_parse_file (int set_yydebug)
1222 warning(0, "The C parser does not support -dy, option ignored");
1226 "The Objective-C parser does not support -dy, option ignored");
1229 warning(0, "The C++ parser does not support -dy, option ignored");
1233 "The Objective-C++ parser does not support -dy, option ignored");
1248 /* And end the main input file, if the debug writer wants it */
1249 if (debug_hooks->start_end_main_source_file)
1250 (*debug_hooks->end_source_file) (0);
1251 if (++i >= num_in_fnames)
1253 cpp_undef_all (parse_in);
1254 cpp_clear_file_cache (parse_in);
1256 = cpp_read_main_file (parse_in, in_fnames[i]);
1257 /* If an input file is missing, abandon further compilation.
1258 cpplib has issued a diagnostic. */
1259 if (!this_input_filename)
1264 /* Common finish hook for the C, ObjC and C++ front ends. */
1266 c_common_finish (void)
1268 FILE *deps_stream = NULL;
1270 /* Don't write the deps file if there are errors. */
1271 if (cpp_opts->deps.style != DEPS_NONE && !seen_error ())
1273 /* If -M or -MM was seen without -MF, default output to the
1276 deps_stream = out_stream;
1279 deps_stream = fopen (deps_file, deps_append ? "a": "w");
1281 fatal_error ("opening dependency file %s: %m", deps_file);
1285 /* For performance, avoid tearing down cpplib's internal structures
1286 with cpp_destroy (). */
1287 cpp_finish (parse_in, deps_stream);
1289 if (deps_stream && deps_stream != out_stream
1290 && (ferror (deps_stream) || fclose (deps_stream)))
1291 fatal_error ("closing dependency file %s: %m", deps_file);
1293 if (out_stream && (ferror (out_stream) || fclose (out_stream)))
1294 fatal_error ("when writing output to %s: %m", out_fname);
1297 /* Either of two environment variables can specify output of
1298 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1299 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1300 and DEPS_TARGET is the target to mention in the deps. They also
1301 result in dependency information being appended to the output file
1302 rather than overwriting it, and like Sun's compiler
1303 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1305 check_deps_environment_vars (void)
1309 GET_ENVIRONMENT (spec, "DEPENDENCIES_OUTPUT");
1311 cpp_opts->deps.style = DEPS_USER;
1314 GET_ENVIRONMENT (spec, "SUNPRO_DEPENDENCIES");
1317 cpp_opts->deps.style = DEPS_SYSTEM;
1318 cpp_opts->deps.ignore_main_file = true;
1324 /* Find the space before the DEPS_TARGET, if there is one. */
1325 char *s = strchr (spec, ' ');
1328 /* Let the caller perform MAKE quoting. */
1329 defer_opt (OPT_MT, s + 1);
1333 /* Command line -MF overrides environment variables and default. */
1342 /* Handle deferred command line switches. */
1344 handle_deferred_opts (void)
1349 /* Avoid allocating the deps buffer if we don't need it.
1350 (This flag may be true without there having been -MT or -MQ
1351 options, but we'll still need the deps buffer.) */
1355 deps = cpp_get_deps (parse_in);
1357 for (i = 0; i < deferred_count; i++)
1359 struct deferred_opt *opt = &deferred_opts[i];
1361 if (opt->code == OPT_MT || opt->code == OPT_MQ)
1362 deps_add_target (deps, opt->arg, opt->code == OPT_MQ);
1366 /* These settings are appropriate for GCC, but not necessarily so for
1367 cpplib as a library. */
1369 sanitize_cpp_opts (void)
1371 /* If we don't know what style of dependencies to output, complain
1372 if any other dependency switches have been given. */
1373 if (deps_seen && cpp_opts->deps.style == DEPS_NONE)
1374 error ("to generate dependencies you must specify either -M or -MM");
1376 /* -dM and dependencies suppress normal output; do it here so that
1377 the last -d[MDN] switch overrides earlier ones. */
1378 if (flag_dump_macros == 'M')
1381 /* By default, -fdirectives-only implies -dD. This allows subsequent phases
1382 to perform proper macro expansion. */
1383 if (cpp_opts->directives_only && !cpp_opts->preprocessed && !flag_dump_macros)
1384 flag_dump_macros = 'D';
1386 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1387 -dM since at least glibc relies on -M -dM to work. */
1388 /* Also, flag_no_output implies flag_no_line_commands, always. */
1391 if (flag_dump_macros != 'M')
1392 flag_dump_macros = 0;
1393 flag_dump_includes = 0;
1394 flag_no_line_commands = 1;
1396 else if (cpp_opts->deps.missing_files)
1397 error ("-MG may only be used with -M or -MM");
1399 cpp_opts->unsigned_char = !flag_signed_char;
1400 cpp_opts->stdc_0_in_system_headers = STDC_0_IN_SYSTEM_HEADERS;
1402 /* Wlong-long is disabled by default. It is enabled by:
1403 [-pedantic | -Wtraditional] -std=[gnu|c]++98 ; or
1404 [-pedantic | -Wtraditional] -std=non-c99 .
1406 Either -Wlong-long or -Wno-long-long override any other settings. */
1407 if (warn_long_long == -1)
1408 warn_long_long = ((pedantic || warn_traditional)
1409 && (c_dialect_cxx () ? cxx_dialect == cxx98 : !flag_isoc99));
1410 cpp_opts->warn_long_long = warn_long_long;
1412 /* Similarly with -Wno-variadic-macros. No check for c99 here, since
1413 this also turns off warnings about GCCs extension. */
1414 cpp_opts->warn_variadic_macros
1415 = warn_variadic_macros && (pedantic || warn_traditional);
1417 /* If we're generating preprocessor output, emit current directory
1418 if explicitly requested or if debugging information is enabled.
1419 ??? Maybe we should only do it for debugging formats that
1420 actually output the current directory? */
1421 if (flag_working_directory == -1)
1422 flag_working_directory = (debug_info_level != DINFO_LEVEL_NONE);
1424 if (cpp_opts->directives_only)
1426 if (warn_unused_macros)
1427 error ("-fdirectives-only is incompatible with -Wunused_macros");
1428 if (cpp_opts->traditional)
1429 error ("-fdirectives-only is incompatible with -traditional");
1433 /* Add include path with a prefix at the front of its name. */
1435 add_prefixed_path (const char *suffix, size_t chain)
1439 size_t prefix_len, suffix_len;
1441 suffix_len = strlen (suffix);
1442 prefix = iprefix ? iprefix : cpp_GCC_INCLUDE_DIR;
1443 prefix_len = iprefix ? strlen (iprefix) : cpp_GCC_INCLUDE_DIR_len;
1445 path = (char *) xmalloc (prefix_len + suffix_len + 1);
1446 memcpy (path, prefix, prefix_len);
1447 memcpy (path + prefix_len, suffix, suffix_len);
1448 path[prefix_len + suffix_len] = '\0';
1450 add_path (path, chain, 0, false);
1453 /* Handle -D, -U, -A, -imacros, and the first -include. */
1455 finish_options (void)
1457 if (!cpp_opts->preprocessed)
1461 cb_file_change (parse_in,
1462 linemap_add (line_table, LC_RENAME, 0,
1463 _("<built-in>"), 0));
1465 cpp_init_builtins (parse_in, flag_hosted);
1466 c_cpp_builtins (parse_in);
1468 /* We're about to send user input to cpplib, so make it warn for
1469 things that we previously (when we sent it internal definitions)
1470 told it to not warn.
1472 C99 permits implementation-defined characters in identifiers.
1473 The documented meaning of -std= is to turn off extensions that
1474 conflict with the specified standard, and since a strictly
1475 conforming program cannot contain a '$', we do not condition
1476 their acceptance on the -std= setting. */
1477 cpp_opts->warn_dollars = (cpp_opts->pedantic && !cpp_opts->c99);
1479 cb_file_change (parse_in,
1480 linemap_add (line_table, LC_RENAME, 0,
1481 _("<command-line>"), 0));
1483 for (i = 0; i < deferred_count; i++)
1485 struct deferred_opt *opt = &deferred_opts[i];
1487 if (opt->code == OPT_D)
1488 cpp_define (parse_in, opt->arg);
1489 else if (opt->code == OPT_U)
1490 cpp_undef (parse_in, opt->arg);
1491 else if (opt->code == OPT_A)
1493 if (opt->arg[0] == '-')
1494 cpp_unassert (parse_in, opt->arg + 1);
1496 cpp_assert (parse_in, opt->arg);
1500 /* Start the main input file, if the debug writer wants it. */
1501 if (debug_hooks->start_end_main_source_file
1502 && !flag_preprocess_only)
1503 (*debug_hooks->start_source_file) (0, this_input_filename);
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);
1521 if (cpp_opts->directives_only)
1522 cpp_init_special_builtins (parse_in);
1524 /* Start the main input file, if the debug writer wants it. */
1525 if (debug_hooks->start_end_main_source_file
1526 && !flag_preprocess_only)
1527 (*debug_hooks->start_source_file) (0, this_input_filename);
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;
1598 /* Set the C 99 standard (without GNU extensions if ISO). */
1600 set_std_c99 (int iso)
1602 cpp_set_lang (parse_in, iso ? CLK_STDC99: CLK_GNUC99);
1604 flag_no_nonansi_builtin = iso;
1611 /* Set the C 1X standard draft (without GNU extensions if ISO). */
1613 set_std_c1x (int iso)
1615 cpp_set_lang (parse_in, iso ? CLK_STDC1X: CLK_GNUC1X);
1617 flag_no_nonansi_builtin = iso;
1624 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1626 set_std_cxx98 (int iso)
1628 cpp_set_lang (parse_in, iso ? CLK_CXX98: CLK_GNUCXX);
1629 flag_no_gnu_keywords = iso;
1630 flag_no_nonansi_builtin = iso;
1632 cxx_dialect = cxx98;
1635 /* Set the C++ 0x working draft "standard" (without GNU extensions if ISO). */
1637 set_std_cxx0x (int iso)
1639 cpp_set_lang (parse_in, iso ? CLK_CXX0X: CLK_GNUCXX0X);
1640 flag_no_gnu_keywords = iso;
1641 flag_no_nonansi_builtin = iso;
1643 cxx_dialect = cxx0x;
1646 /* Args to -d specify what to dump. Silently ignore
1647 unrecognized options; they may be aimed at toplev.c. */
1649 handle_OPT_d (const char *arg)
1653 while ((c = *arg++) != '\0')
1656 case 'M': /* Dump macros only. */
1657 case 'N': /* Dump names. */
1658 case 'D': /* Dump definitions. */
1659 case 'U': /* Dump used macros. */
1660 flag_dump_macros = c;
1664 flag_dump_includes = 1;