1 /* C/ObjC/C++ command line option handling.
2 Copyright (C) 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
3 Contributed by Neil Booth.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
24 #include "coretypes.h"
31 #include "langhooks.h"
32 #include "tree-inline.h"
33 #include "diagnostic.h"
35 #include "cppdefault.h"
36 #include "c-incpath.h"
37 #include "debug.h" /* For debug_hooks. */
42 #ifndef DOLLARS_IN_IDENTIFIERS
43 # define DOLLARS_IN_IDENTIFIERS true
46 #ifndef TARGET_SYSTEM_ROOT
47 # define TARGET_SYSTEM_ROOT NULL
51 #define TARGET_OPTF(ARG)
55 static cpp_options *cpp_opts;
58 static const char *this_input_filename;
60 /* Filename and stream for preprocessed output. */
61 static const char *out_fname;
62 static FILE *out_stream;
64 /* Append dependencies to deps_file. */
65 static bool deps_append;
67 /* If dependency switches (-MF etc.) have been given. */
68 static bool deps_seen;
73 /* If -lang-fortran seen. */
74 static bool lang_fortran = false;
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 system root, if any. Overridden by -isysroot. */
83 static const char *sysroot = TARGET_SYSTEM_ROOT;
85 /* Zero disables all standard directories for headers. */
86 static bool std_inc = true;
88 /* Zero disables the C++-specific standard directories for headers. */
89 static bool std_cxx_inc = true;
91 /* If the quote chain has been split by -I-. */
92 static bool quote_chain_split;
94 /* If -Wunused-macros. */
95 static bool warn_unused_macros;
97 /* If -Wvariadic-macros. */
98 static bool warn_variadic_macros = true;
100 /* Number of deferred options. */
101 static size_t deferred_count;
103 /* Number of deferred options scanned for -include. */
104 static size_t include_cursor;
106 static void set_Wimplicit (int);
107 static void handle_OPT_d (const char *);
108 static void set_std_cxx98 (int);
109 static void set_std_c89 (int, int);
110 static void set_std_c99 (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
133 /* Complain that switch CODE expects an argument but none was
134 provided. OPT was the command-line option. Return FALSE to get
135 the default message in opts.c, TRUE if we provide a specialized
138 c_common_missing_argument (const char *opt, size_t code)
143 /* Pick up the default message. */
146 case OPT_fconstant_string_class_:
147 error ("no class name specified with %qs", opt);
151 error ("assertion missing after %qs", opt);
156 error ("macro name missing after %qs", opt);
165 error ("missing path after %qs", opt);
174 error ("missing filename after %qs", opt);
179 error ("missing makefile target after %qs", opt);
186 /* Defer option CODE with argument ARG. */
188 defer_opt (enum opt_code code, const char *arg)
190 deferred_opts[deferred_count].code = code;
191 deferred_opts[deferred_count].arg = arg;
195 /* Common initialization before parsing options. */
197 c_common_init_options (unsigned int argc, const char **argv)
199 static const unsigned int lang_flags[] = {CL_C, CL_ObjC, CL_CXX, CL_ObjCXX};
200 unsigned int i, result;
202 /* This is conditionalized only because that is the way the front
203 ends used to do it. Maybe this should be unconditional? */
204 if (c_dialect_cxx ())
206 /* By default wrap lines at 80 characters. Is getenv
207 ("COLUMNS") preferable? */
208 diagnostic_line_cutoff (global_dc) = 80;
209 /* By default, emit location information once for every
210 diagnostic message. */
211 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
214 parse_in = cpp_create_reader (c_dialect_cxx () ? CLK_GNUCXX: CLK_GNUC89,
215 ident_hash, &line_table);
217 cpp_opts = cpp_get_options (parse_in);
218 cpp_opts->dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
219 cpp_opts->objc = c_dialect_objc ();
221 /* Reset to avoid warnings on internal definitions. We set it just
222 before passing on command-line options to cpplib. */
223 cpp_opts->warn_dollars = 0;
225 flag_const_strings = c_dialect_cxx ();
226 flag_exceptions = c_dialect_cxx ();
227 warn_pointer_arith = c_dialect_cxx ();
229 deferred_opts = XNEWVEC (struct deferred_opt, argc);
231 result = lang_flags[c_language];
233 if (c_language == clk_c)
235 /* If preprocessing assembly language, accept any of the C-family
236 front end options since the driver may pass them through. */
237 for (i = 1; i < argc; i++)
238 if (! strcmp (argv[i], "-lang-asm"))
240 result |= CL_C | CL_ObjC | CL_CXX | CL_ObjCXX;
245 for (i = 1; i < argc; i++)
246 if (! strcmp (argv[i], "-lang-fortran"))
248 result |= CL_Fortran;
257 /* Handle switch SCODE with argument ARG. VALUE is true, unless no-
258 form of an -f or -W option was given. Returns 0 if the switch was
259 invalid, a negative number to prevent language-independent
260 processing in toplev.c (a hack necessary for the short-term). */
262 c_common_handle_option (size_t scode, const char *arg, int value)
264 const struct cl_option *option = &cl_options[scode];
265 enum opt_code code = (enum opt_code) scode;
268 /* Prevent resetting the language standard to a C dialect when the driver
269 has already determined that we're looking at assembler input. */
270 bool preprocessing_asm_p = (cpp_get_options (parse_in)->lang == CLK_ASM);
275 if (cl_options[code].flags & (CL_C | CL_CXX | CL_ObjC | CL_ObjCXX))
278 if (lang_fortran && (cl_options[code].flags & (CL_Fortran)))
284 case OPT__output_pch_:
289 defer_opt (code, arg);
293 cpp_opts->discard_comments = 0;
297 cpp_opts->discard_comments = 0;
298 cpp_opts->discard_comments_in_macro_exp = 0;
302 defer_opt (code, arg);
306 flag_preprocess_only = 1;
310 cpp_opts->print_include_names = 1;
314 TARGET_OPTF (xstrdup (arg));
318 if (strcmp (arg, "-"))
319 add_path (xstrdup (arg), BRACKET, 0, true);
322 if (quote_chain_split)
323 error ("-I- specified twice");
324 quote_chain_split = true;
325 split_quote_chain ();
326 inform ("obsolete option -I- used, please use -iquote instead");
332 /* When doing dependencies with -M or -MM, suppress normal
333 preprocessed output, but still do -dM etc. as software
334 depends on this. Preprocessed output does occur if -MD, -MMD
335 or environment var dependency generation is used. */
336 cpp_opts->deps.style = (code == OPT_M ? DEPS_SYSTEM: DEPS_USER);
338 cpp_opts->inhibit_warnings = 1;
343 cpp_opts->deps.style = (code == OPT_MD ? DEPS_SYSTEM: DEPS_USER);
354 cpp_opts->deps.missing_files = true;
359 cpp_opts->deps.phony_targets = true;
365 defer_opt (code, arg);
369 flag_no_line_commands = 1;
372 case OPT_fworking_directory:
373 flag_working_directory = value;
377 defer_opt (code, arg);
383 set_Wimplicit (value);
384 warn_char_subscripts = value;
385 warn_missing_braces = value;
386 warn_parentheses = value;
387 warn_return_type = value;
388 warn_sequence_point = value; /* Was C only. */
389 if (c_dialect_cxx ())
390 warn_sign_compare = value;
392 warn_strict_aliasing = value;
394 /* Only warn about unknown pragmas that are not in system
396 warn_unknown_pragmas = value;
398 /* We save the value of warn_uninitialized, since if they put
399 -Wuninitialized on the command line, we need to generate a
400 warning about not using it without also specifying -O. */
401 if (warn_uninitialized != 1)
402 warn_uninitialized = (value ? 2 : 0);
404 if (!c_dialect_cxx ())
405 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding
406 can turn it off only if it's not explicit. */
407 warn_main = value * 2;
410 /* C++-specific warnings. */
411 warn_nonvdtor = value;
412 warn_reorder = value;
413 warn_nontemplate_friend = value;
416 cpp_opts->warn_trigraphs = value;
417 cpp_opts->warn_comments = value;
418 cpp_opts->warn_num_sign_change = value;
419 cpp_opts->warn_multichar = value; /* Was C++ only. */
421 if (warn_pointer_sign == -1)
422 warn_pointer_sign = 1;
427 cpp_opts->warn_comments = value;
430 case OPT_Wdeprecated:
431 cpp_opts->warn_deprecated = value;
434 case OPT_Wdiv_by_zero:
435 warn_div_by_zero = value;
438 case OPT_Wendif_labels:
439 cpp_opts->warn_endif_labels = value;
443 cpp_opts->warnings_are_errors = value;
444 global_dc->warning_as_error_requested = value;
447 case OPT_Werror_implicit_function_declaration:
448 mesg_implicit_function_declaration = 2;
456 set_Wformat (atoi (arg));
460 set_Wimplicit (value);
464 /* Silently ignore for now. */
467 case OPT_Winvalid_pch:
468 cpp_opts->warn_invalid_pch = value;
478 case OPT_Wmissing_include_dirs:
479 cpp_opts->warn_missing_include_dirs = value;
483 cpp_opts->warn_multichar = value;
486 case OPT_Wnormalized_:
487 if (!value || (arg && strcasecmp (arg, "none") == 0))
488 cpp_opts->warn_normalize = normalized_none;
489 else if (!arg || strcasecmp (arg, "nfkc") == 0)
490 cpp_opts->warn_normalize = normalized_KC;
491 else if (strcasecmp (arg, "id") == 0)
492 cpp_opts->warn_normalize = normalized_identifier_C;
493 else if (strcasecmp (arg, "nfc") == 0)
494 cpp_opts->warn_normalize = normalized_C;
496 error ("argument %qs to %<-Wnormalized%> not recognized", arg);
499 case OPT_Wreturn_type:
500 warn_return_type = value;
503 case OPT_Wstrict_null_sentinel:
504 warn_strict_null_sentinel = value;
507 case OPT_Wsystem_headers:
508 cpp_opts->warn_system_headers = value;
511 case OPT_Wtraditional:
512 cpp_opts->warn_traditional = value;
516 cpp_opts->warn_trigraphs = value;
520 cpp_opts->warn_undef = value;
523 case OPT_Wunknown_pragmas:
524 /* Set to greater than 1, so that even unknown pragmas in
525 system headers will be warned about. */
526 warn_unknown_pragmas = value * 2;
529 case OPT_Wunused_macros:
530 warn_unused_macros = value;
533 case OPT_Wvariadic_macros:
534 warn_variadic_macros = value;
537 case OPT_Wwrite_strings:
538 if (!c_dialect_cxx ())
539 flag_const_strings = value;
541 warn_write_strings = value;
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_fdollars_in_identifiers:
603 cpp_opts->dollars_in_ident = value;
606 case OPT_ffreestanding:
608 /* Fall through.... */
611 flag_no_builtin = !value;
612 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
613 if (!value && warn_main == 2)
617 case OPT_fshort_double:
618 flag_short_double = value;
621 case OPT_fshort_enums:
622 flag_short_enums = value;
625 case OPT_fshort_wchar:
626 flag_short_wchar = value;
629 case OPT_fsigned_bitfields:
630 flag_signed_bitfields = value;
633 case OPT_fsigned_char:
634 flag_signed_char = value;
637 case OPT_funsigned_bitfields:
638 flag_signed_bitfields = !value;
641 case OPT_funsigned_char:
642 flag_signed_char = !value;
646 flag_check_new = value;
649 case OPT_fconserve_space:
650 flag_conserve_space = value;
653 case OPT_fconst_strings:
654 flag_const_strings = value;
657 case OPT_fconstant_string_class_:
658 constant_string_class_name = arg;
661 case OPT_fdefault_inline:
662 flag_default_inline = value;
665 case OPT_felide_constructors:
666 flag_elide_constructors = value;
669 case OPT_fenforce_eh_specs:
670 flag_enforce_eh_specs = value;
673 case OPT_fextended_identifiers:
674 cpp_opts->extended_identifiers = value;
678 flag_new_for_scope = value;
681 case OPT_fgnu_keywords:
682 flag_no_gnu_keywords = !value;
685 case OPT_fgnu_runtime:
686 flag_next_runtime = !value;
689 case OPT_fhandle_exceptions:
690 warning (0, "-fhandle-exceptions has been renamed -fexceptions (and is now on by default)");
691 flag_exceptions = value;
694 case OPT_fimplement_inlines:
695 flag_implement_inlines = value;
698 case OPT_fimplicit_inline_templates:
699 flag_implicit_inline_templates = value;
702 case OPT_fimplicit_templates:
703 flag_implicit_templates = value;
706 case OPT_fms_extensions:
707 flag_ms_extensions = value;
710 case OPT_fnext_runtime:
711 flag_next_runtime = value;
714 case OPT_fnil_receivers:
715 flag_nil_receivers = value;
718 case OPT_fnonansi_builtins:
719 flag_no_nonansi_builtin = !value;
722 case OPT_foperator_names:
723 cpp_opts->operator_names = value;
726 case OPT_foptional_diags:
727 flag_optional_diags = value;
731 cpp_opts->restore_pch_deps = value;
734 case OPT_fpch_preprocess:
735 flag_pch_preprocess = value;
738 case OPT_fpermissive:
739 flag_permissive = value;
742 case OPT_fpreprocessed:
743 cpp_opts->preprocessed = value;
746 case OPT_freplace_objc_classes:
747 flag_replace_objc_classes = value;
751 flag_use_repository = value;
753 flag_implicit_templates = 0;
760 case OPT_fshow_column:
761 cpp_opts->show_column = value;
765 flag_detailed_statistics = value;
769 /* It is documented that we silently ignore silly values. */
770 if (value >= 1 && value <= 100)
771 cpp_opts->tabstop = value;
774 case OPT_fexec_charset_:
775 cpp_opts->narrow_charset = arg;
778 case OPT_fwide_exec_charset_:
779 cpp_opts->wide_charset = arg;
782 case OPT_finput_charset_:
783 cpp_opts->input_charset = arg;
786 case OPT_ftemplate_depth_:
787 max_tinst_depth = value;
790 case OPT_fuse_cxa_atexit:
791 flag_use_cxa_atexit = value;
794 case OPT_fvisibility_inlines_hidden:
795 visibility_options.inlines_hidden = value;
802 case OPT_fthreadsafe_statics:
803 flag_threadsafe_statics = value;
807 flag_zero_link = value;
811 flag_gen_declaration = 1;
815 add_path (xstrdup (arg), AFTER, 0, true);
820 defer_opt (code, arg);
828 add_path (xstrdup (arg), QUOTE, 0, true);
836 add_path (xstrdup (arg), SYSTEM, 0, true);
839 case OPT_iwithprefix:
840 add_prefixed_path (arg, SYSTEM);
843 case OPT_iwithprefixbefore:
844 add_prefixed_path (arg, BRACKET);
848 cpp_set_lang (parse_in, CLK_ASM);
849 cpp_opts->dollars_in_ident = false;
852 case OPT_lang_fortran:
872 error ("output filename specified twice");
875 /* We need to handle the -pedantic switches here, rather than in
876 c_common_post_options, so that a subsequent -Wno-endif-labels
877 is not overridden. */
878 case OPT_pedantic_errors:
879 cpp_opts->pedantic_errors = 1;
882 cpp_opts->pedantic = 1;
883 cpp_opts->warn_endif_labels = 1;
884 if (warn_pointer_sign == -1)
885 warn_pointer_sign = 1;
888 case OPT_print_objc_runtime_info:
889 print_struct_values = 1;
892 case OPT_print_pch_checksum:
893 c_common_print_pch_checksum (stdout);
894 exit_after_options = true;
902 case OPT_std_gnu__98:
903 if (!preprocessing_asm_p)
904 set_std_cxx98 (code == OPT_std_c__98 /* ISO */);
908 case OPT_std_iso9899_1990:
909 case OPT_std_iso9899_199409:
910 if (!preprocessing_asm_p)
911 set_std_c89 (code == OPT_std_iso9899_199409 /* c94 */, true /* ISO */);
915 if (!preprocessing_asm_p)
916 set_std_c89 (false /* c94 */, false /* ISO */);
921 case OPT_std_iso9899_1999:
922 case OPT_std_iso9899_199x:
923 if (!preprocessing_asm_p)
924 set_std_c99 (true /* ISO */);
929 if (!preprocessing_asm_p)
930 set_std_c99 (false /* ISO */);
934 cpp_opts->trigraphs = 1;
937 case OPT_traditional_cpp:
938 cpp_opts->traditional = 1;
946 cpp_opts->inhibit_warnings = 1;
957 /* Post-switch processing. */
959 c_common_post_options (const char **pfilename)
961 struct cpp_callbacks *cb;
963 /* Canonicalize the input and output filenames. */
964 if (in_fnames == NULL)
966 in_fnames = XNEWVEC (const char *, 1);
969 else if (strcmp (in_fnames[0], "-") == 0)
972 if (out_fname == NULL || !strcmp (out_fname, "-"))
975 if (cpp_opts->deps.style == DEPS_NONE)
976 check_deps_environment_vars ();
978 handle_deferred_opts ();
980 sanitize_cpp_opts ();
982 register_include_chains (parse_in, sysroot, iprefix,
983 std_inc, std_cxx_inc && c_dialect_cxx (), verbose);
985 flag_inline_trees = 1;
987 /* Use tree inlining. */
990 if (flag_inline_functions)
991 flag_inline_trees = 2;
993 /* If we are given more than one input file, we must use
994 unit-at-a-time mode. */
995 if (num_in_fnames > 1)
996 flag_unit_at_a_time = 1;
998 /* Default to ObjC sjlj exception handling if NeXT runtime. */
999 if (flag_objc_sjlj_exceptions < 0)
1000 flag_objc_sjlj_exceptions = flag_next_runtime;
1001 if (flag_objc_exceptions && !flag_objc_sjlj_exceptions)
1002 flag_exceptions = 1;
1004 /* -Wextra implies -Wsign-compare and -Wmissing-field-initializers,
1005 but not if explicitly overridden. */
1006 if (warn_sign_compare == -1)
1007 warn_sign_compare = extra_warnings;
1008 if (warn_missing_field_initializers == -1)
1009 warn_missing_field_initializers = extra_warnings;
1011 /* -Wpointer_sign is disabled by default, but it is enabled if any
1012 of -Wall or -pedantic are given. */
1013 if (warn_pointer_sign == -1)
1014 warn_pointer_sign = 0;
1016 /* Special format checking options don't work without -Wformat; warn if
1020 warning (OPT_Wformat_y2k,
1021 "-Wformat-y2k ignored without -Wformat");
1022 warning (OPT_Wformat_extra_args,
1023 "-Wformat-extra-args ignored without -Wformat");
1024 warning (OPT_Wformat_zero_length,
1025 "-Wformat-zero-length ignored without -Wformat");
1026 warning (OPT_Wformat_nonliteral,
1027 "-Wformat-nonliteral ignored without -Wformat");
1028 warning (OPT_Wformat_security,
1029 "-Wformat-security ignored without -Wformat");
1032 /* C99 requires special handling of complex multiplication and division;
1033 -ffast-math and -fcx-limited-range are handled in process_options. */
1035 flag_complex_method = 2;
1037 if (flag_preprocess_only)
1039 /* Open the output now. We must do so even if flag_no_output is
1040 on, because there may be other output than from the actual
1041 preprocessing (e.g. from -dM). */
1042 if (out_fname[0] == '\0')
1043 out_stream = stdout;
1045 out_stream = fopen (out_fname, "w");
1047 if (out_stream == NULL)
1049 fatal_error ("opening output file %s: %m", out_fname);
1053 if (num_in_fnames > 1)
1054 error ("too many filenames given. Type %s --help for usage",
1057 init_pp_output (out_stream);
1063 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1064 input_location = UNKNOWN_LOCATION;
1067 cb = cpp_get_callbacks (parse_in);
1068 cb->file_change = cb_file_change;
1069 cb->dir_change = cb_dir_change;
1070 cpp_post_options (parse_in);
1072 input_location = UNKNOWN_LOCATION;
1074 /* If an error has occurred in cpplib, note it so we fail
1076 errorcount += cpp_errors (parse_in);
1078 *pfilename = this_input_filename
1079 = cpp_read_main_file (parse_in, in_fnames[0]);
1080 /* Don't do any compilation or preprocessing if there is no input file. */
1081 if (this_input_filename == NULL)
1087 if (flag_working_directory
1088 && flag_preprocess_only && !flag_no_line_commands)
1089 pp_dir_change (parse_in, get_src_pwd ());
1091 return flag_preprocess_only;
1094 /* Front end initialization common to C, ObjC and C++. */
1096 c_common_init (void)
1098 /* Set up preprocessor arithmetic. Must be done after call to
1099 c_common_nodes_and_builtins for type nodes to be good. */
1100 cpp_opts->precision = TYPE_PRECISION (intmax_type_node);
1101 cpp_opts->char_precision = TYPE_PRECISION (char_type_node);
1102 cpp_opts->int_precision = TYPE_PRECISION (integer_type_node);
1103 cpp_opts->wchar_precision = TYPE_PRECISION (wchar_type_node);
1104 cpp_opts->unsigned_wchar = TYPE_UNSIGNED (wchar_type_node);
1105 cpp_opts->bytes_big_endian = BYTES_BIG_ENDIAN;
1107 /* This can't happen until after wchar_precision and bytes_big_endian
1109 cpp_init_iconv (parse_in);
1112 c_common_print_pch_checksum (stderr);
1114 if (flag_preprocess_only)
1117 preprocess_file (parse_in);
1121 /* Has to wait until now so that cpplib has its hash table. */
1127 /* Initialize the integrated preprocessor after debug output has been
1128 initialized; loop over each input file. */
1130 c_common_parse_file (int set_yydebug)
1134 /* Enable parser debugging, if requested and we can. If requested
1135 and we can't, notify the user. */
1137 yydebug = set_yydebug;
1140 warning (0, "YYDEBUG was not defined at build time, -dy ignored");
1146 /* Start the main input file, if the debug writer wants it. */
1147 if (debug_hooks->start_end_main_source_file)
1148 (*debug_hooks->start_source_file) (0, this_input_filename);
1155 /* And end the main input file, if the debug writer wants it */
1156 if (debug_hooks->start_end_main_source_file)
1157 (*debug_hooks->end_source_file) (0);
1158 if (++i >= num_in_fnames)
1160 cpp_undef_all (parse_in);
1162 = cpp_read_main_file (parse_in, in_fnames[i]);
1163 /* If an input file is missing, abandon further compilation.
1164 cpplib has issued a diagnostic. */
1165 if (!this_input_filename)
1170 /* Common finish hook for the C, ObjC and C++ front ends. */
1172 c_common_finish (void)
1174 FILE *deps_stream = NULL;
1176 if (cpp_opts->deps.style != DEPS_NONE)
1178 /* If -M or -MM was seen without -MF, default output to the
1181 deps_stream = out_stream;
1184 deps_stream = fopen (deps_file, deps_append ? "a": "w");
1186 fatal_error ("opening dependency file %s: %m", deps_file);
1190 /* For performance, avoid tearing down cpplib's internal structures
1191 with cpp_destroy (). */
1192 errorcount += cpp_finish (parse_in, deps_stream);
1194 if (deps_stream && deps_stream != out_stream
1195 && (ferror (deps_stream) || fclose (deps_stream)))
1196 fatal_error ("closing dependency file %s: %m", deps_file);
1198 if (out_stream && (ferror (out_stream) || fclose (out_stream)))
1199 fatal_error ("when writing output to %s: %m", out_fname);
1202 /* Either of two environment variables can specify output of
1203 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1204 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1205 and DEPS_TARGET is the target to mention in the deps. They also
1206 result in dependency information being appended to the output file
1207 rather than overwriting it, and like Sun's compiler
1208 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1210 check_deps_environment_vars (void)
1214 GET_ENVIRONMENT (spec, "DEPENDENCIES_OUTPUT");
1216 cpp_opts->deps.style = DEPS_USER;
1219 GET_ENVIRONMENT (spec, "SUNPRO_DEPENDENCIES");
1222 cpp_opts->deps.style = DEPS_SYSTEM;
1223 cpp_opts->deps.ignore_main_file = true;
1229 /* Find the space before the DEPS_TARGET, if there is one. */
1230 char *s = strchr (spec, ' ');
1233 /* Let the caller perform MAKE quoting. */
1234 defer_opt (OPT_MT, s + 1);
1238 /* Command line -MF overrides environment variables and default. */
1247 /* Handle deferred command line switches. */
1249 handle_deferred_opts (void)
1254 /* Avoid allocating the deps buffer if we don't need it.
1255 (This flag may be true without there having been -MT or -MQ
1256 options, but we'll still need the deps buffer.) */
1260 deps = cpp_get_deps (parse_in);
1262 for (i = 0; i < deferred_count; i++)
1264 struct deferred_opt *opt = &deferred_opts[i];
1266 if (opt->code == OPT_MT || opt->code == OPT_MQ)
1267 deps_add_target (deps, opt->arg, opt->code == OPT_MQ);
1271 /* These settings are appropriate for GCC, but not necessarily so for
1272 cpplib as a library. */
1274 sanitize_cpp_opts (void)
1276 /* If we don't know what style of dependencies to output, complain
1277 if any other dependency switches have been given. */
1278 if (deps_seen && cpp_opts->deps.style == DEPS_NONE)
1279 error ("to generate dependencies you must specify either -M or -MM");
1281 /* -dM and dependencies suppress normal output; do it here so that
1282 the last -d[MDN] switch overrides earlier ones. */
1283 if (flag_dump_macros == 'M')
1286 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1287 -dM since at least glibc relies on -M -dM to work. */
1288 /* Also, flag_no_output implies flag_no_line_commands, always. */
1291 if (flag_dump_macros != 'M')
1292 flag_dump_macros = 0;
1293 flag_dump_includes = 0;
1294 flag_no_line_commands = 1;
1297 cpp_opts->unsigned_char = !flag_signed_char;
1298 cpp_opts->stdc_0_in_system_headers = STDC_0_IN_SYSTEM_HEADERS;
1300 /* We want -Wno-long-long to override -pedantic -std=non-c99
1301 and/or -Wtraditional, whatever the ordering. */
1302 cpp_opts->warn_long_long
1303 = warn_long_long && ((!flag_isoc99 && pedantic) || warn_traditional);
1305 /* Similarly with -Wno-variadic-macros. No check for c99 here, since
1306 this also turns off warnings about GCCs extension. */
1307 cpp_opts->warn_variadic_macros
1308 = warn_variadic_macros && (pedantic || warn_traditional);
1310 /* If we're generating preprocessor output, emit current directory
1311 if explicitly requested or if debugging information is enabled.
1312 ??? Maybe we should only do it for debugging formats that
1313 actually output the current directory? */
1314 if (flag_working_directory == -1)
1315 flag_working_directory = (debug_info_level != DINFO_LEVEL_NONE);
1318 /* Add include path with a prefix at the front of its name. */
1320 add_prefixed_path (const char *suffix, size_t chain)
1324 size_t prefix_len, suffix_len;
1326 suffix_len = strlen (suffix);
1327 prefix = iprefix ? iprefix : cpp_GCC_INCLUDE_DIR;
1328 prefix_len = iprefix ? strlen (iprefix) : cpp_GCC_INCLUDE_DIR_len;
1330 path = (char *) xmalloc (prefix_len + suffix_len + 1);
1331 memcpy (path, prefix, prefix_len);
1332 memcpy (path + prefix_len, suffix, suffix_len);
1333 path[prefix_len + suffix_len] = '\0';
1335 add_path (path, chain, 0, false);
1338 /* Handle -D, -U, -A, -imacros, and the first -include. */
1340 finish_options (void)
1342 if (!cpp_opts->preprocessed)
1346 cb_file_change (parse_in,
1347 linemap_add (&line_table, LC_RENAME, 0,
1348 _("<built-in>"), 0));
1350 cpp_init_builtins (parse_in, flag_hosted);
1351 c_cpp_builtins (parse_in);
1353 /* We're about to send user input to cpplib, so make it warn for
1354 things that we previously (when we sent it internal definitions)
1355 told it to not warn.
1357 C99 permits implementation-defined characters in identifiers.
1358 The documented meaning of -std= is to turn off extensions that
1359 conflict with the specified standard, and since a strictly
1360 conforming program cannot contain a '$', we do not condition
1361 their acceptance on the -std= setting. */
1362 cpp_opts->warn_dollars = (cpp_opts->pedantic && !cpp_opts->c99);
1364 cpp_change_file (parse_in, LC_RENAME, _("<command line>"));
1365 for (i = 0; i < deferred_count; i++)
1367 struct deferred_opt *opt = &deferred_opts[i];
1369 if (opt->code == OPT_D)
1370 cpp_define (parse_in, opt->arg);
1371 else if (opt->code == OPT_U)
1372 cpp_undef (parse_in, opt->arg);
1373 else if (opt->code == OPT_A)
1375 if (opt->arg[0] == '-')
1376 cpp_unassert (parse_in, opt->arg + 1);
1378 cpp_assert (parse_in, opt->arg);
1382 /* Handle -imacros after -D and -U. */
1383 for (i = 0; i < deferred_count; i++)
1385 struct deferred_opt *opt = &deferred_opts[i];
1387 if (opt->code == OPT_imacros
1388 && cpp_push_include (parse_in, opt->arg))
1390 /* Disable push_command_line_include callback for now. */
1391 include_cursor = deferred_count + 1;
1392 cpp_scan_nooutput (parse_in);
1398 push_command_line_include ();
1401 /* Give CPP the next file given by -include, if any. */
1403 push_command_line_include (void)
1405 while (include_cursor < deferred_count)
1407 struct deferred_opt *opt = &deferred_opts[include_cursor++];
1409 if (!cpp_opts->preprocessed && opt->code == OPT_include
1410 && cpp_push_include (parse_in, opt->arg))
1414 if (include_cursor == deferred_count)
1417 /* -Wunused-macros should only warn about macros defined hereafter. */
1418 cpp_opts->warn_unused_macros = warn_unused_macros;
1419 /* Restore the line map from <command line>. */
1420 if (!cpp_opts->preprocessed)
1421 cpp_change_file (parse_in, LC_RENAME, this_input_filename);
1423 /* Set this here so the client can change the option if it wishes,
1424 and after stacking the main file so we don't trace the main file. */
1425 line_table.trace_includes = cpp_opts->print_include_names;
1429 /* File change callback. Has to handle -include files. */
1431 cb_file_change (cpp_reader * ARG_UNUSED (pfile),
1432 const struct line_map *new_map)
1434 if (flag_preprocess_only)
1435 pp_file_change (new_map);
1437 fe_file_change (new_map);
1439 if (new_map == 0 || (new_map->reason == LC_LEAVE && MAIN_FILE_P (new_map)))
1440 push_command_line_include ();
1444 cb_dir_change (cpp_reader * ARG_UNUSED (pfile), const char *dir)
1446 if (!set_src_pwd (dir))
1447 warning (0, "too late for # directive to set debug directory");
1450 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1451 extensions if ISO). There is no concept of gnu94. */
1453 set_std_c89 (int c94, int iso)
1455 cpp_set_lang (parse_in, c94 ? CLK_STDC94: iso ? CLK_STDC89: CLK_GNUC89);
1458 flag_no_gnu_keywords = iso;
1459 flag_no_nonansi_builtin = iso;
1464 /* Set the C 99 standard (without GNU extensions if ISO). */
1466 set_std_c99 (int iso)
1468 cpp_set_lang (parse_in, iso ? CLK_STDC99: CLK_GNUC99);
1470 flag_no_nonansi_builtin = iso;
1476 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1478 set_std_cxx98 (int iso)
1480 cpp_set_lang (parse_in, iso ? CLK_CXX98: CLK_GNUCXX);
1481 flag_no_gnu_keywords = iso;
1482 flag_no_nonansi_builtin = iso;
1486 /* Handle setting implicit to ON. */
1488 set_Wimplicit (int on)
1491 warn_implicit_int = on;
1494 if (mesg_implicit_function_declaration != 2)
1495 mesg_implicit_function_declaration = 1;
1498 mesg_implicit_function_declaration = 0;
1501 /* Args to -d specify what to dump. Silently ignore
1502 unrecognized options; they may be aimed at toplev.c. */
1504 handle_OPT_d (const char *arg)
1508 while ((c = *arg++) != '\0')
1511 case 'M': /* Dump macros only. */
1512 case 'N': /* Dump names. */
1513 case 'D': /* Dump definitions. */
1514 flag_dump_macros = c;
1518 flag_dump_includes = 1;