1 /* C/ObjC/C++ command line option handling.
2 Copyright (C) 2002, 2003 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, 59 Temple Place - Suite 330, 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. */
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_EBCDIC 0
53 static const int lang_flags[] = {CL_C, CL_ObjC, CL_CXX, CL_ObjCXX};
55 static int saved_lineno;
58 static cpp_options *cpp_opts;
61 static const char *in_fname;
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 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 /* Number of deferred options, deferred options array size. */
98 static size_t deferred_count, deferred_size;
100 /* Number of deferred options scanned for -include. */
101 static size_t include_cursor;
103 void missing_arg (enum opt_code);
104 static void set_Wimplicit (int);
105 static void print_help (void);
106 static void handle_OPT_d (const char *);
107 static void set_std_cxx98 (int);
108 static void set_std_c89 (int, int);
109 static void set_std_c99 (int);
110 static void check_deps_environment_vars (void);
111 static void handle_deferred_opts (void);
112 static void sanitize_cpp_opts (void);
113 static void add_prefixed_path (const char *, size_t);
114 static void push_command_line_include (void);
115 static void cb_file_change (cpp_reader *, const struct line_map *);
116 static void finish_options (void);
118 #ifndef STDC_0_IN_SYSTEM_HEADERS
119 #define STDC_0_IN_SYSTEM_HEADERS 0
122 /* Holds switches parsed by c_common_handle_option (), but whose
123 handling is deferred to c_common_post_options (). */
124 static void defer_opt (enum opt_code, const char *);
125 static struct deferred_opt
131 /* Complain that switch OPT_INDEX expects an argument but none was
134 missing_arg (enum opt_code code)
136 const char *opt_text = cl_options[code].opt_text;
140 case OPT__output_pch_:
143 case OPT_fabi_version_:
146 case OPT_fname_mangling_version_:
148 case OPT_ftemplate_depth_:
150 case OPT_iwithprefix:
151 case OPT_iwithprefixbefore:
153 error ("missing argument to \"-%s\"", opt_text);
156 case OPT_fconstant_string_class_:
157 error ("no class name specified with \"-%s\"", opt_text);
161 error ("assertion missing after \"-%s\"", opt_text);
166 error ("macro name missing after \"-%s\"", opt_text);
173 error ("missing path after \"-%s\"", opt_text);
182 error ("missing filename after \"-%s\"", opt_text);
187 error ("missing target after \"-%s\"", opt_text);
192 /* Defer option CODE with argument ARG. */
194 defer_opt (enum opt_code code, const char *arg)
196 /* FIXME: this should be in c_common_init_options, which should take
200 extern int save_argc;
201 deferred_size = save_argc;
202 deferred_opts = (struct deferred_opt *)
203 xmalloc (deferred_size * sizeof (struct deferred_opt));
206 if (deferred_count == deferred_size)
209 deferred_opts[deferred_count].code = code;
210 deferred_opts[deferred_count].arg = arg;
214 /* Common initialization before parsing options. */
216 c_common_init_options (enum c_language_kind lang)
219 parse_in = cpp_create_reader (lang == clk_c ? CLK_GNUC89 : CLK_GNUCXX,
221 cpp_opts = cpp_get_options (parse_in);
222 cpp_opts->dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
224 /* Reset to avoid warnings on internal definitions. We set it just
225 before passing on command-line options to cpplib. */
226 cpp_opts->warn_dollars = 0;
231 flag_const_strings = (lang == clk_cplusplus);
232 warn_pointer_arith = (lang == clk_cplusplus);
234 return lang_flags[(c_language << 1) + flag_objc];
237 /* Handle switch SCODE with argument ARG. ON is true, unless no-
238 form of an -f or -W option was given. Returns 0 if the switch was
239 invalid, a negative number to prevent language-independent
240 processing in toplev.c (a hack necessary for the short-term). */
242 c_common_handle_option (size_t scode, const char *arg, int value)
244 const struct cl_option *option = &cl_options[scode];
245 enum opt_code code = (enum opt_code) scode;
255 error ("too many filenames given. Type %s --help for usage",
269 case OPT__output_pch_:
274 defer_opt (code, arg);
278 cpp_opts->discard_comments = 0;
282 cpp_opts->discard_comments = 0;
283 cpp_opts->discard_comments_in_macro_exp = 0;
287 defer_opt (code, arg);
291 flag_preprocess_only = 1;
295 cpp_opts->print_include_names = 1;
299 if (strcmp (arg, "-"))
300 add_path (xstrdup (arg), BRACKET, 0);
303 if (quote_chain_split)
304 error ("-I- specified twice");
305 quote_chain_split = true;
306 split_quote_chain ();
312 /* When doing dependencies with -M or -MM, suppress normal
313 preprocessed output, but still do -dM etc. as software
314 depends on this. Preprocessed output does occur if -MD, -MMD
315 or environment var dependency generation is used. */
316 cpp_opts->deps.style = (code == OPT_M ? DEPS_SYSTEM: DEPS_USER);
318 cpp_opts->inhibit_warnings = 1;
323 cpp_opts->deps.style = (code == OPT_MD ? DEPS_SYSTEM: DEPS_USER);
334 cpp_opts->deps.missing_files = true;
339 cpp_opts->deps.phony_targets = true;
345 defer_opt (code, arg);
349 flag_no_line_commands = 1;
353 defer_opt (code, arg);
363 set_Wimplicit (value);
364 warn_char_subscripts = value;
365 warn_missing_braces = value;
366 warn_parentheses = value;
367 warn_return_type = value;
368 warn_sequence_point = value; /* Was C only. */
369 if (c_language == clk_cplusplus)
370 warn_sign_compare = value;
372 warn_strict_aliasing = value;
374 /* Only warn about unknown pragmas that are not in system
376 warn_unknown_pragmas = value;
378 /* We save the value of warn_uninitialized, since if they put
379 -Wuninitialized on the command line, we need to generate a
380 warning about not using it without also specifying -O. */
381 if (warn_uninitialized != 1)
382 warn_uninitialized = (value ? 2 : 0);
384 if (c_language == clk_c)
385 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding
386 can turn it off only if it's not explicit. */
387 warn_main = value * 2;
390 /* C++-specific warnings. */
391 warn_nonvdtor = value;
392 warn_reorder = value;
393 warn_nontemplate_friend = value;
396 cpp_opts->warn_trigraphs = value;
397 cpp_opts->warn_comments = value;
398 cpp_opts->warn_num_sign_change = value;
399 cpp_opts->warn_multichar = value; /* Was C++ only. */
402 case OPT_Wbad_function_cast:
403 warn_bad_function_cast = value;
407 warn_cast_qual = value;
410 case OPT_Wchar_subscripts:
411 warn_char_subscripts = value;
416 cpp_opts->warn_comments = value;
419 case OPT_Wconversion:
420 warn_conversion = value;
423 case OPT_Wctor_dtor_privacy:
424 warn_ctor_dtor_privacy = value;
427 case OPT_Wdeprecated:
428 warn_deprecated = value;
429 cpp_opts->warn_deprecated = value;
432 case OPT_Wdiv_by_zero:
433 warn_div_by_zero = value;
440 case OPT_Wendif_labels:
441 cpp_opts->warn_endif_labels = value;
445 cpp_opts->warnings_are_errors = value;
448 case OPT_Werror_implicit_function_declaration:
449 mesg_implicit_function_declaration = 2;
452 case OPT_Wfloat_equal:
453 warn_float_equal = value;
461 set_Wformat (atoi (arg));
464 case OPT_Wformat_extra_args:
465 warn_format_extra_args = value;
468 case OPT_Wformat_nonliteral:
469 warn_format_nonliteral = value;
472 case OPT_Wformat_security:
473 warn_format_security = value;
476 case OPT_Wformat_y2k:
477 warn_format_y2k = value;
480 case OPT_Wformat_zero_length:
481 warn_format_zero_length = value;
485 set_Wimplicit (value);
488 case OPT_Wimplicit_function_declaration:
489 mesg_implicit_function_declaration = value;
492 case OPT_Wimplicit_int:
493 warn_implicit_int = value;
497 cpp_opts->warn_import = value;
500 case OPT_Winvalid_offsetof:
501 warn_invalid_offsetof = value;
504 case OPT_Winvalid_pch:
505 cpp_opts->warn_invalid_pch = value;
509 warn_long_long = value;
519 case OPT_Wmissing_braces:
520 warn_missing_braces = value;
523 case OPT_Wmissing_declarations:
524 warn_missing_declarations = value;
527 case OPT_Wmissing_format_attribute:
528 warn_missing_format_attribute = value;
531 case OPT_Wmissing_prototypes:
532 warn_missing_prototypes = value;
536 cpp_opts->warn_multichar = value;
539 case OPT_Wnested_externs:
540 warn_nested_externs = value;
543 case OPT_Wnon_template_friend:
544 warn_nontemplate_friend = value;
547 case OPT_Wnon_virtual_dtor:
548 warn_nonvdtor = value;
552 warn_nonnull = value;
555 case OPT_Wold_style_cast:
556 warn_old_style_cast = value;
559 case OPT_Woverloaded_virtual:
560 warn_overloaded_virtual = value;
563 case OPT_Wparentheses:
564 warn_parentheses = value;
567 case OPT_Wpmf_conversions:
568 warn_pmf2ptr = value;
571 case OPT_Wpointer_arith:
572 warn_pointer_arith = value;
576 warn_protocol = value;
580 warn_selector = value;
583 case OPT_Wredundant_decls:
584 warn_redundant_decls = value;
588 warn_reorder = value;
591 case OPT_Wreturn_type:
592 warn_return_type = value;
595 case OPT_Wsequence_point:
596 warn_sequence_point = value;
599 case OPT_Wsign_compare:
600 warn_sign_compare = value;
603 case OPT_Wsign_promo:
604 warn_sign_promo = value;
607 case OPT_Wstrict_prototypes:
608 warn_strict_prototypes = value;
615 case OPT_Wsystem_headers:
616 cpp_opts->warn_system_headers = value;
619 case OPT_Wtraditional:
620 warn_traditional = value;
621 cpp_opts->warn_traditional = value;
625 cpp_opts->warn_trigraphs = value;
628 case OPT_Wundeclared_selector:
629 warn_undeclared_selector = value;
633 cpp_opts->warn_undef = value;
636 case OPT_Wunknown_pragmas:
637 /* Set to greater than 1, so that even unknown pragmas in
638 system headers will be warned about. */
639 warn_unknown_pragmas = value * 2;
642 case OPT_Wunused_macros:
643 warn_unused_macros = value;
646 case OPT_Wwrite_strings:
647 if (c_language == clk_c)
648 flag_const_strings = value;
650 warn_write_strings = value;
654 if (c_language == clk_c)
655 set_std_c89 (false, true);
657 set_std_cxx98 (true);
664 case OPT_fcond_mismatch:
665 if (c_language == clk_c)
667 flag_cond_mismatch = value;
672 case OPT_fall_virtual:
673 case OPT_fenum_int_equiv:
674 case OPT_fguiding_decls:
676 case OPT_fhuge_objects:
678 case OPT_fname_mangling_version_:
680 case OPT_fnonnull_objects:
682 case OPT_fstrict_prototype:
683 case OPT_fthis_is_variable:
684 case OPT_fvtable_thunks:
686 warning ("switch \"%s\" is no longer supported", option->opt_text);
689 case OPT_fabi_version_:
690 flag_abi_version = value;
693 case OPT_faccess_control:
694 flag_access_control = value;
697 case OPT_falt_external_templates:
698 flag_alt_external_templates = value;
700 flag_external_templates = true;
702 warning ("switch \"%s\" is deprecated, please see documentation for details", option->opt_text);
706 flag_no_asm = !value;
710 flag_no_builtin = !value;
717 disable_builtin_function (arg);
720 case OPT_fdollars_in_identifiers:
721 cpp_opts->dollars_in_ident = value;
725 if (!dump_switch_p (arg))
729 case OPT_ffreestanding:
731 /* Fall through... */
734 flag_no_builtin = !value;
735 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
736 if (!value && warn_main == 2)
740 case OPT_fshort_double:
741 flag_short_double = value;
744 case OPT_fshort_enums:
745 flag_short_enums = value;
748 case OPT_fshort_wchar:
749 flag_short_wchar = value;
752 case OPT_fsigned_bitfields:
753 flag_signed_bitfields = value;
754 explicit_flag_signed_bitfields = 1;
757 case OPT_fsigned_char:
758 flag_signed_char = value;
761 case OPT_funsigned_bitfields:
762 flag_signed_bitfields = !value;
763 explicit_flag_signed_bitfields = 1;
766 case OPT_funsigned_char:
767 flag_signed_char = !value;
771 flag_check_new = value;
774 case OPT_fconserve_space:
775 flag_conserve_space = value;
778 case OPT_fconst_strings:
779 flag_const_strings = value;
782 case OPT_fconstant_string_class_:
783 constant_string_class_name = arg;
786 case OPT_fdefault_inline:
787 flag_default_inline = value;
790 case OPT_felide_constructors:
791 flag_elide_constructors = value;
794 case OPT_fenforce_eh_specs:
795 flag_enforce_eh_specs = value;
798 case OPT_fexternal_templates:
799 flag_external_templates = value;
802 case OPT_ffixed_form:
803 case OPT_ffixed_line_length_:
804 /* Fortran front end options ignored when preprocessing only. */
805 if (!flag_preprocess_only)
810 flag_new_for_scope = value;
813 case OPT_fgnu_keywords:
814 flag_no_gnu_keywords = !value;
817 case OPT_fgnu_runtime:
818 flag_next_runtime = !value;
821 case OPT_fhandle_exceptions:
822 warning ("-fhandle-exceptions has been renamed -fexceptions (and is now on by default)");
823 flag_exceptions = value;
826 case OPT_fimplement_inlines:
827 flag_implement_inlines = value;
830 case OPT_fimplicit_inline_templates:
831 flag_implicit_inline_templates = value;
834 case OPT_fimplicit_templates:
835 flag_implicit_templates = value;
838 case OPT_fms_extensions:
839 flag_ms_extensions = value;
842 case OPT_fnext_runtime:
843 flag_next_runtime = value;
846 case OPT_fnonansi_builtins:
847 flag_no_nonansi_builtin = !value;
850 case OPT_foperator_names:
851 cpp_opts->operator_names = value;
854 case OPT_foptional_diags:
855 flag_optional_diags = value;
859 cpp_opts->restore_pch_deps = value;
862 case OPT_fpermissive:
863 flag_permissive = value;
866 case OPT_fpreprocessed:
867 cpp_opts->preprocessed = value;
871 flag_use_repository = value;
873 flag_implicit_templates = 0;
880 case OPT_fshow_column:
881 cpp_opts->show_column = value;
885 flag_detailed_statistics = value;
889 /* It is documented that we silently ignore silly values. */
890 if (value >= 1 && value <= 100)
891 cpp_opts->tabstop = value;
894 case OPT_ftemplate_depth_:
895 max_tinst_depth = value;
899 flag_vtable_gc = value;
902 case OPT_fuse_cxa_atexit:
903 flag_use_cxa_atexit = value;
911 flag_gen_declaration = 1;
915 add_path (xstrdup (arg), AFTER, 0);
920 defer_opt (code, arg);
932 add_path (xstrdup (arg), SYSTEM, 0);
935 case OPT_iwithprefix:
936 add_prefixed_path (arg, SYSTEM);
939 case OPT_iwithprefixbefore:
940 add_prefixed_path (arg, BRACKET);
944 cpp_set_lang (parse_in, CLK_ASM);
945 cpp_opts->dollars_in_ident = false;
964 error ("output filename specified twice");
967 /* We need to handle the -pedantic switches here, rather than in
968 c_common_post_options, so that a subsequent -Wno-endif-labels
969 is not overridden. */
970 case OPT_pedantic_errors:
971 cpp_opts->pedantic_errors = 1;
974 cpp_opts->pedantic = 1;
975 cpp_opts->warn_endif_labels = 1;
978 case OPT_print_objc_runtime_info:
979 print_struct_values = 1;
987 case OPT_std_gnu__98:
988 set_std_cxx98 (code == OPT_std_c__98 /* ISO */);
992 case OPT_std_iso9899_1990:
993 case OPT_std_iso9899_199409:
994 set_std_c89 (code == OPT_std_iso9899_199409 /* c94 */, true /* ISO */);
998 set_std_c89 (false /* c94 */, false /* ISO */);
1003 case OPT_std_iso9899_1999:
1004 case OPT_std_iso9899_199x:
1005 set_std_c99 (true /* ISO */);
1010 set_std_c99 (false /* ISO */);
1014 cpp_opts->trigraphs = 1;
1017 case OPT_traditional_cpp:
1018 cpp_opts->traditional = 1;
1026 cpp_opts->inhibit_warnings = 1;
1037 /* Post-switch processing. */
1039 c_common_post_options (const char **pfilename)
1041 /* Canonicalize the input and output filenames. */
1042 if (in_fname == NULL || !strcmp (in_fname, "-"))
1045 if (out_fname == NULL || !strcmp (out_fname, "-"))
1048 if (cpp_opts->deps.style == DEPS_NONE)
1049 check_deps_environment_vars ();
1051 handle_deferred_opts ();
1053 sanitize_cpp_opts ();
1055 register_include_chains (parse_in, sysroot, iprefix,
1056 std_inc, std_cxx_inc && c_language == clk_cplusplus,
1059 flag_inline_trees = 1;
1061 /* Use tree inlining if possible. Function instrumentation is only
1062 done in the RTL level, so we disable tree inlining. */
1063 if (! flag_instrument_function_entry_exit)
1065 if (!flag_no_inline)
1067 if (flag_inline_functions)
1069 flag_inline_trees = 2;
1070 flag_inline_functions = 0;
1074 /* -Wextra implies -Wsign-compare, but not if explicitly
1076 if (warn_sign_compare == -1)
1077 warn_sign_compare = extra_warnings;
1079 /* Special format checking options don't work without -Wformat; warn if
1081 if (warn_format_y2k && !warn_format)
1082 warning ("-Wformat-y2k ignored without -Wformat");
1083 if (warn_format_extra_args && !warn_format)
1084 warning ("-Wformat-extra-args ignored without -Wformat");
1085 if (warn_format_zero_length && !warn_format)
1086 warning ("-Wformat-zero-length ignored without -Wformat");
1087 if (warn_format_nonliteral && !warn_format)
1088 warning ("-Wformat-nonliteral ignored without -Wformat");
1089 if (warn_format_security && !warn_format)
1090 warning ("-Wformat-security ignored without -Wformat");
1091 if (warn_missing_format_attribute && !warn_format)
1092 warning ("-Wmissing-format-attribute ignored without -Wformat");
1094 if (flag_preprocess_only)
1096 /* Open the output now. We must do so even if flag_no_output is
1097 on, because there may be other output than from the actual
1098 preprocessing (e.g. from -dM). */
1099 if (out_fname[0] == '\0')
1100 out_stream = stdout;
1102 out_stream = fopen (out_fname, "w");
1104 if (out_stream == NULL)
1106 fatal_error ("opening output file %s: %m", out_fname);
1110 init_pp_output (out_stream);
1116 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1120 cpp_get_callbacks (parse_in)->file_change = cb_file_change;
1122 /* NOTE: we use in_fname here, not the one supplied. */
1123 *pfilename = cpp_read_main_file (parse_in, in_fname);
1125 saved_lineno = input_line;
1128 /* If an error has occurred in cpplib, note it so we fail
1130 errorcount += cpp_errors (parse_in);
1132 return flag_preprocess_only;
1135 /* Front end initialization common to C, ObjC and C++. */
1137 c_common_init (void)
1139 input_line = saved_lineno;
1141 /* Set up preprocessor arithmetic. Must be done after call to
1142 c_common_nodes_and_builtins for type nodes to be good. */
1143 cpp_opts->precision = TYPE_PRECISION (intmax_type_node);
1144 cpp_opts->char_precision = TYPE_PRECISION (char_type_node);
1145 cpp_opts->int_precision = TYPE_PRECISION (integer_type_node);
1146 cpp_opts->wchar_precision = TYPE_PRECISION (wchar_type_node);
1147 cpp_opts->unsigned_wchar = TREE_UNSIGNED (wchar_type_node);
1148 cpp_opts->EBCDIC = TARGET_EBCDIC;
1150 if (flag_preprocess_only)
1153 preprocess_file (parse_in);
1157 /* Has to wait until now so that cpplib has its hash table. */
1163 /* A thin wrapper around the real parser that initializes the
1164 integrated preprocessor after debug output has been initialized.
1165 Also, make sure the start_source_file debug hook gets called for
1166 the primary source file. */
1168 c_common_parse_file (int set_yydebug ATTRIBUTE_UNUSED)
1171 yydebug = set_yydebug;
1173 warning ("YYDEBUG not defined");
1176 (*debug_hooks->start_source_file) (input_line, input_filename);
1180 free_parser_stacks ();
1183 /* Common finish hook for the C, ObjC and C++ front ends. */
1185 c_common_finish (void)
1187 FILE *deps_stream = NULL;
1189 if (cpp_opts->deps.style != DEPS_NONE)
1191 /* If -M or -MM was seen without -MF, default output to the
1194 deps_stream = out_stream;
1197 deps_stream = fopen (deps_file, deps_append ? "a": "w");
1199 fatal_error ("opening dependency file %s: %m", deps_file);
1203 /* For performance, avoid tearing down cpplib's internal structures
1204 with cpp_destroy (). */
1205 errorcount += cpp_finish (parse_in, deps_stream);
1207 if (deps_stream && deps_stream != out_stream
1208 && (ferror (deps_stream) || fclose (deps_stream)))
1209 fatal_error ("closing dependency file %s: %m", deps_file);
1211 if (out_stream && (ferror (out_stream) || fclose (out_stream)))
1212 fatal_error ("when writing output to %s: %m", out_fname);
1215 /* Either of two environment variables can specify output of
1216 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1217 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1218 and DEPS_TARGET is the target to mention in the deps. They also
1219 result in dependency information being appended to the output file
1220 rather than overwriting it, and like Sun's compiler
1221 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1223 check_deps_environment_vars (void)
1227 GET_ENVIRONMENT (spec, "DEPENDENCIES_OUTPUT");
1229 cpp_opts->deps.style = DEPS_USER;
1232 GET_ENVIRONMENT (spec, "SUNPRO_DEPENDENCIES");
1235 cpp_opts->deps.style = DEPS_SYSTEM;
1236 cpp_opts->deps.ignore_main_file = true;
1242 /* Find the space before the DEPS_TARGET, if there is one. */
1243 char *s = strchr (spec, ' ');
1246 /* Let the caller perform MAKE quoting. */
1247 defer_opt (OPT_MT, s + 1);
1251 /* Command line -MF overrides environment variables and default. */
1259 /* Handle deferred command line switches. */
1261 handle_deferred_opts (void)
1265 for (i = 0; i < deferred_count; i++)
1267 struct deferred_opt *opt = &deferred_opts[i];
1269 if (opt->code == OPT_MT || opt->code == OPT_MQ)
1270 cpp_add_dependency_target (parse_in, opt->arg, opt->code == OPT_MQ);
1274 /* These settings are appropriate for GCC, but not necessarily so for
1275 cpplib as a library. */
1277 sanitize_cpp_opts (void)
1279 /* If we don't know what style of dependencies to output, complain
1280 if any other dependency switches have been given. */
1281 if (deps_seen && cpp_opts->deps.style == DEPS_NONE)
1282 error ("to generate dependencies you must specify either -M or -MM");
1284 /* -dM and dependencies suppress normal output; do it here so that
1285 the last -d[MDN] switch overrides earlier ones. */
1286 if (flag_dump_macros == 'M')
1289 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1290 -dM since at least glibc relies on -M -dM to work. */
1293 if (flag_dump_macros != 'M')
1294 flag_dump_macros = 0;
1295 flag_dump_includes = 0;
1298 cpp_opts->unsigned_char = !flag_signed_char;
1299 cpp_opts->stdc_0_in_system_headers = STDC_0_IN_SYSTEM_HEADERS;
1301 /* We want -Wno-long-long to override -pedantic -std=non-c99
1302 and/or -Wtraditional, whatever the ordering. */
1303 cpp_opts->warn_long_long
1304 = warn_long_long && ((!flag_isoc99 && pedantic) || warn_traditional);
1307 /* Add include path with a prefix at the front of its name. */
1309 add_prefixed_path (const char *suffix, size_t chain)
1313 size_t prefix_len, suffix_len;
1315 suffix_len = strlen (suffix);
1316 prefix = iprefix ? iprefix : cpp_GCC_INCLUDE_DIR;
1317 prefix_len = iprefix ? strlen (iprefix) : cpp_GCC_INCLUDE_DIR_len;
1319 path = xmalloc (prefix_len + suffix_len + 1);
1320 memcpy (path, prefix, prefix_len);
1321 memcpy (path + prefix_len, suffix, suffix_len);
1322 path[prefix_len + suffix_len] = '\0';
1324 add_path (path, chain, 0);
1327 /* Handle -D, -U, -A, -imacros, and the first -include. */
1329 finish_options (void)
1331 if (!cpp_opts->preprocessed)
1335 cpp_change_file (parse_in, LC_RENAME, _("<built-in>"));
1336 cpp_init_builtins (parse_in, flag_hosted);
1337 c_cpp_builtins (parse_in);
1339 /* We're about to send user input to cpplib, so make it warn for
1340 things that we previously (when we sent it internal definitions)
1341 told it to not warn.
1343 C99 permits implementation-defined characters in identifiers.
1344 The documented meaning of -std= is to turn off extensions that
1345 conflict with the specified standard, and since a strictly
1346 conforming program cannot contain a '$', we do not condition
1347 their acceptance on the -std= setting. */
1348 cpp_opts->warn_dollars = (cpp_opts->pedantic && !cpp_opts->c99);
1350 cpp_change_file (parse_in, LC_RENAME, _("<command line>"));
1351 for (i = 0; i < deferred_count; i++)
1353 struct deferred_opt *opt = &deferred_opts[i];
1355 if (opt->code == OPT_D)
1356 cpp_define (parse_in, opt->arg);
1357 else if (opt->code == OPT_U)
1358 cpp_undef (parse_in, opt->arg);
1359 else if (opt->code == OPT_A)
1361 if (opt->arg[0] == '-')
1362 cpp_unassert (parse_in, opt->arg + 1);
1364 cpp_assert (parse_in, opt->arg);
1368 /* Handle -imacros after -D and -U. */
1369 for (i = 0; i < deferred_count; i++)
1371 struct deferred_opt *opt = &deferred_opts[i];
1373 if (opt->code == OPT_imacros
1374 && cpp_push_include (parse_in, opt->arg))
1375 cpp_scan_nooutput (parse_in);
1379 push_command_line_include ();
1382 /* Give CPP the next file given by -include, if any. */
1384 push_command_line_include (void)
1386 if (cpp_opts->preprocessed)
1389 while (include_cursor < deferred_count)
1391 struct deferred_opt *opt = &deferred_opts[include_cursor++];
1393 if (opt->code == OPT_include && cpp_push_include (parse_in, opt->arg))
1397 if (include_cursor == deferred_count)
1399 /* Restore the line map from <command line>. */
1400 cpp_change_file (parse_in, LC_RENAME, main_input_filename);
1401 /* -Wunused-macros should only warn about macros defined hereafter. */
1402 cpp_opts->warn_unused_macros = warn_unused_macros;
1407 /* File change callback. Has to handle -include files. */
1409 cb_file_change (cpp_reader *pfile ATTRIBUTE_UNUSED,
1410 const struct line_map *new_map)
1412 if (flag_preprocess_only)
1413 pp_file_change (new_map);
1415 fe_file_change (new_map);
1417 if (new_map->reason == LC_LEAVE && MAIN_FILE_P (new_map))
1418 push_command_line_include ();
1421 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1422 extensions if ISO). There is no concept of gnu94. */
1424 set_std_c89 (int c94, int iso)
1426 cpp_set_lang (parse_in, c94 ? CLK_STDC94: iso ? CLK_STDC89: CLK_GNUC89);
1429 flag_no_gnu_keywords = iso;
1430 flag_no_nonansi_builtin = iso;
1431 flag_noniso_default_format_attributes = !iso;
1434 flag_writable_strings = 0;
1437 /* Set the C 99 standard (without GNU extensions if ISO). */
1439 set_std_c99 (int iso)
1441 cpp_set_lang (parse_in, iso ? CLK_STDC99: CLK_GNUC99);
1443 flag_no_nonansi_builtin = iso;
1444 flag_noniso_default_format_attributes = !iso;
1448 flag_writable_strings = 0;
1451 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1453 set_std_cxx98 (int iso)
1455 cpp_set_lang (parse_in, iso ? CLK_CXX98: CLK_GNUCXX);
1456 flag_no_gnu_keywords = iso;
1457 flag_no_nonansi_builtin = iso;
1458 flag_noniso_default_format_attributes = !iso;
1462 /* Handle setting implicit to ON. */
1464 set_Wimplicit (int on)
1467 warn_implicit_int = on;
1470 if (mesg_implicit_function_declaration != 2)
1471 mesg_implicit_function_declaration = 1;
1474 mesg_implicit_function_declaration = 0;
1477 /* Args to -d specify what to dump. Silently ignore
1478 unrecognized options; they may be aimed at toplev.c. */
1480 handle_OPT_d (const char *arg)
1484 while ((c = *arg++) != '\0')
1487 case 'M': /* Dump macros only. */
1488 case 'N': /* Dump names. */
1489 case 'D': /* Dump definitions. */
1490 flag_dump_macros = c;
1494 flag_dump_includes = 1;
1499 /* Handle --help output. */
1503 /* To keep the lines from getting too long for some compilers, limit
1504 to about 500 characters (6 lines) per chunk. */
1507 -include <file> Include the contents of <file> before other files\n\
1508 -imacros <file> Accept definition of macros in <file>\n\
1509 -iprefix <path> Specify <path> as a prefix for next two options\n\
1510 -iwithprefix <dir> Add <dir> to the end of the system include path\n\
1511 -iwithprefixbefore <dir> Add <dir> to the end of the main include path\n\
1512 -isystem <dir> Add <dir> to the start of the system include path\n\
1515 -idirafter <dir> Add <dir> to the end of the system include path\n\
1516 -I <dir> Add <dir> to the end of the main include path\n\
1517 -I- Fine-grained include path control; see info docs\n\
1518 -nostdinc Do not search system include directories\n\
1519 (dirs specified with -isystem will still be used)\n\
1520 -nostdinc++ Do not search system include directories for C++\n\
1521 -o <file> Put output into <file>\n\
1524 -trigraphs Support ISO C trigraphs\n\
1525 -std=<std name> Specify the conformance standard; one of:\n\
1526 gnu89, gnu99, c89, c99, iso9899:1990,\n\
1527 iso9899:199409, iso9899:1999, c++98\n\
1528 -w Inhibit warning messages\n\
1529 -W[no-]trigraphs Warn if trigraphs are encountered\n\
1530 -W[no-]comment{s} Warn if one comment starts inside another\n\
1533 -W[no-]traditional Warn about features not present in traditional C\n\
1534 -W[no-]undef Warn if an undefined macro is used by #if\n\
1535 -W[no-]import Warn about the use of the #import directive\n\
1538 -W[no-]error Treat all warnings as errors\n\
1539 -W[no-]system-headers Do not suppress warnings from system headers\n\
1540 -W[no-]all Enable most preprocessor warnings\n\
1543 -M Generate make dependencies\n\
1544 -MM As -M, but ignore system header files\n\
1545 -MD Generate make dependencies and compile\n\
1546 -MMD As -MD, but ignore system header files\n\
1547 -MF <file> Write dependency output to the given file\n\
1548 -MG Treat missing header file as generated files\n\
1551 -MP Generate phony targets for all headers\n\
1552 -MQ <target> Add a MAKE-quoted target\n\
1553 -MT <target> Add an unquoted target\n\
1556 -D<macro> Define a <macro> with string '1' as its value\n\
1557 -D<macro>=<val> Define a <macro> with <val> as its value\n\
1558 -A<question>=<answer> Assert the <answer> to <question>\n\
1559 -A-<question>=<answer> Disable the <answer> to <question>\n\
1560 -U<macro> Undefine <macro> \n\
1561 -v Display the version number\n\
1564 -H Print the name of header files as they are used\n\
1565 -C Do not discard comments\n\
1566 -dM Display a list of macro definitions active at end\n\
1567 -dD Preserve macro definitions in output\n\
1568 -dN As -dD except that only the names are preserved\n\
1569 -dI Include #include directives in the output\n\
1572 -f[no-]preprocessed Treat the input file as already preprocessed\n\
1573 -ftabstop=<number> Distance between tab stops for column reporting\n\
1574 -isysroot <dir> Set <dir> to be the system root directory\n\
1575 -P Do not generate #line directives\n\
1576 -remap Remap file names when including files\n\
1577 --help Display this information\n\