1 /* C/ObjC/C++ command line option handling.
2 Copyright (C) 2002, 2003, 2004 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
49 static int saved_lineno;
52 static cpp_options *cpp_opts;
55 static const char *this_input_filename;
57 /* Filename and stream for preprocessed output. */
58 static const char *out_fname;
59 static FILE *out_stream;
61 /* Append dependencies to deps_file. */
62 static bool deps_append;
64 /* If dependency switches (-MF etc.) have been given. */
65 static bool deps_seen;
70 /* Dependency output file. */
71 static const char *deps_file;
73 /* The prefix given by -iprefix, if any. */
74 static const char *iprefix;
76 /* The system root, if any. Overridden by -isysroot. */
77 static const char *sysroot = TARGET_SYSTEM_ROOT;
79 /* Zero disables all standard directories for headers. */
80 static bool std_inc = true;
82 /* Zero disables the C++-specific standard directories for headers. */
83 static bool std_cxx_inc = true;
85 /* If the quote chain has been split by -I-. */
86 static bool quote_chain_split;
88 /* If -Wunused-macros. */
89 static bool warn_unused_macros;
91 /* Number of deferred options. */
92 static size_t deferred_count;
94 /* Number of deferred options scanned for -include. */
95 static size_t include_cursor;
97 /* Permit Fotran front-end options. */
98 static bool permit_fortran_options;
100 static void set_Wimplicit (int);
101 static void handle_OPT_d (const char *);
102 static void set_std_cxx98 (int);
103 static void set_std_c89 (int, int);
104 static void set_std_c99 (int);
105 static void check_deps_environment_vars (void);
106 static void handle_deferred_opts (void);
107 static void sanitize_cpp_opts (void);
108 static void add_prefixed_path (const char *, size_t);
109 static void push_command_line_include (void);
110 static void cb_file_change (cpp_reader *, const struct line_map *);
111 static bool finish_options (const char *);
113 #ifndef STDC_0_IN_SYSTEM_HEADERS
114 #define STDC_0_IN_SYSTEM_HEADERS 0
117 /* Holds switches parsed by c_common_handle_option (), but whose
118 handling is deferred to c_common_post_options (). */
119 static void defer_opt (enum opt_code, const char *);
120 static struct deferred_opt
126 /* Complain that switch CODE expects an argument but none was
127 provided. OPT was the command-line option. Return FALSE to get
128 the default message in opts.c, TRUE if we provide a specialized
131 c_common_missing_argument (const char *opt, size_t code)
136 /* Pick up the default message. */
139 case OPT_fconstant_string_class_:
140 error ("no class name specified with \"%s\"", opt);
144 error ("assertion missing after \"%s\"", opt);
149 error ("macro name missing after \"%s\"", opt);
156 error ("missing path after \"%s\"", opt);
165 error ("missing filename after \"%s\"", opt);
170 error ("missing makefile target after \"%s\"", opt);
177 /* Defer option CODE with argument ARG. */
179 defer_opt (enum opt_code code, const char *arg)
181 deferred_opts[deferred_count].code = code;
182 deferred_opts[deferred_count].arg = arg;
186 /* Common initialization before parsing options. */
188 c_common_init_options (unsigned int argc, const char **argv ATTRIBUTE_UNUSED)
190 static const unsigned int lang_flags[] = {CL_C, CL_ObjC, CL_CXX, CL_ObjCXX};
193 /* This is conditionalized only because that is the way the front
194 ends used to do it. Maybe this should be unconditional? */
195 if (c_dialect_cxx ())
197 /* By default wrap lines at 80 characters. Is getenv
198 ("COLUMNS") preferable? */
199 diagnostic_line_cutoff (global_dc) = 80;
200 /* By default, emit location information once for every
201 diagnostic message. */
202 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
205 parse_in = cpp_create_reader (c_dialect_cxx () ? CLK_GNUCXX: CLK_GNUC89,
206 ident_hash, &line_table);
208 cpp_opts = cpp_get_options (parse_in);
209 cpp_opts->dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
210 cpp_opts->objc = c_dialect_objc ();
212 /* Reset to avoid warnings on internal definitions. We set it just
213 before passing on command-line options to cpplib. */
214 cpp_opts->warn_dollars = 0;
216 flag_const_strings = c_dialect_cxx ();
217 flag_exceptions = c_dialect_cxx ();
218 warn_pointer_arith = c_dialect_cxx ();
220 deferred_opts = xmalloc (argc * sizeof (struct deferred_opt));
222 result = lang_flags[c_language];
224 /* If potentially preprocessing Fortran we have to accept its front
225 end options since the driver passes most of them through. */
227 if (c_language == clk_c && argc > 2
228 && !strcmp (argv[2], "-traditional-cpp" ))
230 permit_fortran_options = true;
238 /* Handle switch SCODE with argument ARG. VALUE is true, unless no-
239 form of an -f or -W option was given. Returns 0 if the switch was
240 invalid, a negative number to prevent language-independent
241 processing in toplev.c (a hack necessary for the short-term). */
243 c_common_handle_option (size_t scode, const char *arg, int value)
245 const struct cl_option *option = &cl_options[scode];
246 enum opt_code code = (enum opt_code) scode;
252 result = permit_fortran_options;
255 case OPT__output_pch_:
260 defer_opt (code, arg);
264 cpp_opts->discard_comments = 0;
268 cpp_opts->discard_comments = 0;
269 cpp_opts->discard_comments_in_macro_exp = 0;
273 defer_opt (code, arg);
277 flag_preprocess_only = 1;
281 cpp_opts->print_include_names = 1;
285 if (strcmp (arg, "-"))
286 add_path (xstrdup (arg), BRACKET, 0);
289 if (quote_chain_split)
290 error ("-I- specified twice");
291 quote_chain_split = true;
292 split_quote_chain ();
298 /* When doing dependencies with -M or -MM, suppress normal
299 preprocessed output, but still do -dM etc. as software
300 depends on this. Preprocessed output does occur if -MD, -MMD
301 or environment var dependency generation is used. */
302 cpp_opts->deps.style = (code == OPT_M ? DEPS_SYSTEM: DEPS_USER);
304 cpp_opts->inhibit_warnings = 1;
309 cpp_opts->deps.style = (code == OPT_MD ? DEPS_SYSTEM: DEPS_USER);
320 cpp_opts->deps.missing_files = true;
325 cpp_opts->deps.phony_targets = true;
331 defer_opt (code, arg);
335 flag_no_line_commands = 1;
338 case OPT_fworking_directory:
339 flag_working_directory = value;
343 defer_opt (code, arg);
353 set_Wimplicit (value);
354 warn_char_subscripts = value;
355 warn_missing_braces = value;
356 warn_parentheses = value;
357 warn_return_type = value;
358 warn_sequence_point = value; /* Was C only. */
359 if (c_dialect_cxx ())
360 warn_sign_compare = value;
362 warn_strict_aliasing = value;
364 /* Only warn about unknown pragmas that are not in system
366 warn_unknown_pragmas = value;
368 /* We save the value of warn_uninitialized, since if they put
369 -Wuninitialized on the command line, we need to generate a
370 warning about not using it without also specifying -O. */
371 if (warn_uninitialized != 1)
372 warn_uninitialized = (value ? 2 : 0);
374 if (!c_dialect_cxx ())
375 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding
376 can turn it off only if it's not explicit. */
377 warn_main = value * 2;
380 /* C++-specific warnings. */
381 warn_nonvdtor = value;
382 warn_reorder = value;
383 warn_nontemplate_friend = value;
386 cpp_opts->warn_trigraphs = value;
387 cpp_opts->warn_comments = value;
388 cpp_opts->warn_num_sign_change = value;
389 cpp_opts->warn_multichar = value; /* Was C++ only. */
392 case OPT_Wbad_function_cast:
393 warn_bad_function_cast = value;
397 warn_cast_qual = value;
400 case OPT_Wchar_subscripts:
401 warn_char_subscripts = value;
406 cpp_opts->warn_comments = value;
409 case OPT_Wconversion:
410 warn_conversion = value;
413 case OPT_Wctor_dtor_privacy:
414 warn_ctor_dtor_privacy = value;
417 case OPT_Wdeclaration_after_statement:
418 warn_declaration_after_statement = value;
421 case OPT_Wdeprecated:
422 warn_deprecated = value;
423 cpp_opts->warn_deprecated = value;
426 case OPT_Wdiv_by_zero:
427 warn_div_by_zero = value;
434 case OPT_Wendif_labels:
435 cpp_opts->warn_endif_labels = value;
439 cpp_opts->warnings_are_errors = value;
442 case OPT_Werror_implicit_function_declaration:
443 mesg_implicit_function_declaration = 2;
446 case OPT_Wfloat_equal:
447 warn_float_equal = value;
455 set_Wformat (atoi (arg));
458 case OPT_Wformat_extra_args:
459 warn_format_extra_args = value;
462 case OPT_Wformat_nonliteral:
463 warn_format_nonliteral = value;
466 case OPT_Wformat_security:
467 warn_format_security = value;
470 case OPT_Wformat_y2k:
471 warn_format_y2k = value;
474 case OPT_Wformat_zero_length:
475 warn_format_zero_length = value;
479 warn_init_self = value;
483 set_Wimplicit (value);
486 case OPT_Wimplicit_function_declaration:
487 mesg_implicit_function_declaration = value;
490 case OPT_Wimplicit_int:
491 warn_implicit_int = value;
495 /* Silently ignore for now. */
498 case OPT_Winvalid_offsetof:
499 warn_invalid_offsetof = value;
502 case OPT_Winvalid_pch:
503 cpp_opts->warn_invalid_pch = value;
507 warn_long_long = value;
517 case OPT_Wmissing_braces:
518 warn_missing_braces = value;
521 case OPT_Wmissing_declarations:
522 warn_missing_declarations = value;
525 case OPT_Wmissing_format_attribute:
526 warn_missing_format_attribute = value;
529 case OPT_Wmissing_prototypes:
530 warn_missing_prototypes = value;
534 cpp_opts->warn_multichar = value;
537 case OPT_Wnested_externs:
538 warn_nested_externs = value;
541 case OPT_Wnon_template_friend:
542 warn_nontemplate_friend = value;
545 case OPT_Wnon_virtual_dtor:
546 warn_nonvdtor = value;
550 warn_nonnull = value;
553 case OPT_Wold_style_definition:
554 warn_old_style_definition = value;
557 case OPT_Wold_style_cast:
558 warn_old_style_cast = value;
561 case OPT_Woverloaded_virtual:
562 warn_overloaded_virtual = value;
565 case OPT_Wparentheses:
566 warn_parentheses = value;
569 case OPT_Wpmf_conversions:
570 warn_pmf2ptr = value;
573 case OPT_Wpointer_arith:
574 warn_pointer_arith = value;
578 warn_protocol = value;
582 warn_selector = value;
585 case OPT_Wredundant_decls:
586 warn_redundant_decls = value;
590 warn_reorder = value;
593 case OPT_Wreturn_type:
594 warn_return_type = value;
597 case OPT_Wsequence_point:
598 warn_sequence_point = value;
601 case OPT_Wsign_compare:
602 warn_sign_compare = value;
605 case OPT_Wsign_promo:
606 warn_sign_promo = value;
609 case OPT_Wstrict_prototypes:
610 warn_strict_prototypes = value;
617 case OPT_Wsystem_headers:
618 cpp_opts->warn_system_headers = value;
621 case OPT_Wtraditional:
622 warn_traditional = value;
623 cpp_opts->warn_traditional = value;
627 cpp_opts->warn_trigraphs = value;
630 case OPT_Wundeclared_selector:
631 warn_undeclared_selector = value;
635 cpp_opts->warn_undef = value;
638 case OPT_Wunknown_pragmas:
639 /* Set to greater than 1, so that even unknown pragmas in
640 system headers will be warned about. */
641 warn_unknown_pragmas = value * 2;
644 case OPT_Wunused_macros:
645 warn_unused_macros = value;
648 case OPT_Wwrite_strings:
649 if (!c_dialect_cxx ())
650 flag_const_strings = value;
652 warn_write_strings = value;
656 if (!c_dialect_cxx ())
657 set_std_c89 (false, true);
659 set_std_cxx98 (true);
666 case OPT_fcond_mismatch:
667 if (!c_dialect_cxx ())
669 flag_cond_mismatch = value;
674 case OPT_fall_virtual:
675 case OPT_falt_external_templates:
676 case OPT_fenum_int_equiv:
677 case OPT_fexternal_templates:
678 case OPT_fguiding_decls:
680 case OPT_fhuge_objects:
682 case OPT_fname_mangling_version_:
684 case OPT_fnonnull_objects:
686 case OPT_fstrict_prototype:
687 case OPT_fthis_is_variable:
688 case OPT_fvtable_thunks:
691 warning ("switch \"%s\" is no longer supported", option->opt_text);
694 case OPT_fabi_version_:
695 flag_abi_version = value;
698 case OPT_faccess_control:
699 flag_access_control = value;
703 flag_no_asm = !value;
707 flag_no_builtin = !value;
714 disable_builtin_function (arg);
717 case OPT_fdollars_in_identifiers:
718 cpp_opts->dollars_in_ident = value;
722 if (!dump_switch_p (arg))
726 case OPT_ffreestanding:
728 /* Fall through.... */
731 flag_no_builtin = !value;
732 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
733 if (!value && warn_main == 2)
737 case OPT_fshort_double:
738 flag_short_double = value;
741 case OPT_fshort_enums:
742 flag_short_enums = value;
745 case OPT_fshort_wchar:
746 flag_short_wchar = value;
749 case OPT_fsigned_bitfields:
750 flag_signed_bitfields = value;
751 explicit_flag_signed_bitfields = 1;
754 case OPT_fsigned_char:
755 flag_signed_char = value;
758 case OPT_funsigned_bitfields:
759 flag_signed_bitfields = !value;
760 explicit_flag_signed_bitfields = 1;
763 case OPT_funsigned_char:
764 flag_signed_char = !value;
768 flag_check_new = value;
771 case OPT_fconserve_space:
772 flag_conserve_space = value;
775 case OPT_fconst_strings:
776 flag_const_strings = value;
779 case OPT_fconstant_string_class_:
780 constant_string_class_name = arg;
783 case OPT_fdefault_inline:
784 flag_default_inline = value;
787 case OPT_felide_constructors:
788 flag_elide_constructors = value;
791 case OPT_fenforce_eh_specs:
792 flag_enforce_eh_specs = value;
795 case OPT_ffixed_form:
796 case OPT_ffixed_line_length_:
797 /* Fortran front end options ignored when preprocessing only. */
798 if (!flag_preprocess_only)
803 flag_new_for_scope = value;
806 case OPT_fgnu_keywords:
807 flag_no_gnu_keywords = !value;
810 case OPT_fgnu_runtime:
811 flag_next_runtime = !value;
814 case OPT_fhandle_exceptions:
815 warning ("-fhandle-exceptions has been renamed -fexceptions (and is now on by default)");
816 flag_exceptions = value;
819 case OPT_fimplement_inlines:
820 flag_implement_inlines = value;
823 case OPT_fimplicit_inline_templates:
824 flag_implicit_inline_templates = value;
827 case OPT_fimplicit_templates:
828 flag_implicit_templates = value;
831 case OPT_fms_extensions:
832 flag_ms_extensions = value;
835 case OPT_fnext_runtime:
836 flag_next_runtime = value;
839 case OPT_fnil_receivers:
840 flag_nil_receivers = value;
843 case OPT_fnonansi_builtins:
844 flag_no_nonansi_builtin = !value;
847 case OPT_fobjc_exceptions:
848 flag_objc_exceptions = value;
851 case OPT_foperator_names:
852 cpp_opts->operator_names = value;
855 case OPT_foptional_diags:
856 flag_optional_diags = value;
860 cpp_opts->restore_pch_deps = value;
863 case OPT_fpermissive:
864 flag_permissive = value;
867 case OPT_fpreprocessed:
868 cpp_opts->preprocessed = value;
871 case OPT_freplace_objc_classes:
872 flag_replace_objc_classes = value;
876 flag_use_repository = value;
878 flag_implicit_templates = 0;
885 case OPT_fshow_column:
886 cpp_opts->show_column = value;
890 flag_detailed_statistics = value;
894 /* It is documented that we silently ignore silly values. */
895 if (value >= 1 && value <= 100)
896 cpp_opts->tabstop = value;
899 case OPT_fexec_charset_:
900 cpp_opts->narrow_charset = arg;
903 case OPT_fwide_exec_charset_:
904 cpp_opts->wide_charset = arg;
907 case OPT_finput_charset_:
908 cpp_opts->input_charset = arg;
911 case OPT_ftemplate_depth_:
912 max_tinst_depth = value;
915 case OPT_fuse_cxa_atexit:
916 flag_use_cxa_atexit = value;
924 flag_zero_link = value;
928 flag_gen_declaration = 1;
932 add_path (xstrdup (arg), AFTER, 0);
937 defer_opt (code, arg);
949 add_path (xstrdup (arg), SYSTEM, 0);
952 case OPT_iwithprefix:
953 add_prefixed_path (arg, SYSTEM);
956 case OPT_iwithprefixbefore:
957 add_prefixed_path (arg, BRACKET);
961 cpp_set_lang (parse_in, CLK_ASM);
962 cpp_opts->dollars_in_ident = false;
981 error ("output filename specified twice");
984 /* We need to handle the -pedantic switches here, rather than in
985 c_common_post_options, so that a subsequent -Wno-endif-labels
986 is not overridden. */
987 case OPT_pedantic_errors:
988 cpp_opts->pedantic_errors = 1;
991 cpp_opts->pedantic = 1;
992 cpp_opts->warn_endif_labels = 1;
995 case OPT_print_objc_runtime_info:
996 print_struct_values = 1;
1000 cpp_opts->remap = 1;
1004 case OPT_std_gnu__98:
1005 set_std_cxx98 (code == OPT_std_c__98 /* ISO */);
1009 case OPT_std_iso9899_1990:
1010 case OPT_std_iso9899_199409:
1011 set_std_c89 (code == OPT_std_iso9899_199409 /* c94 */, true /* ISO */);
1015 set_std_c89 (false /* c94 */, false /* ISO */);
1020 case OPT_std_iso9899_1999:
1021 case OPT_std_iso9899_199x:
1022 set_std_c99 (true /* ISO */);
1027 set_std_c99 (false /* ISO */);
1031 cpp_opts->trigraphs = 1;
1034 case OPT_traditional_cpp:
1035 cpp_opts->traditional = 1;
1043 cpp_opts->inhibit_warnings = 1;
1054 /* Post-switch processing. */
1056 c_common_post_options (const char **pfilename ATTRIBUTE_UNUSED)
1058 /* Canonicalize the input and output filenames. */
1059 if (in_fnames == NULL)
1061 in_fnames = xmalloc (sizeof (in_fnames[0]));
1064 else if (strcmp (in_fnames[0], "-") == 0)
1067 if (out_fname == NULL || !strcmp (out_fname, "-"))
1070 if (cpp_opts->deps.style == DEPS_NONE)
1071 check_deps_environment_vars ();
1073 handle_deferred_opts ();
1075 sanitize_cpp_opts ();
1077 register_include_chains (parse_in, sysroot, iprefix,
1078 std_inc, std_cxx_inc && c_dialect_cxx (), verbose);
1080 flag_inline_trees = 1;
1082 /* Use tree inlining if possible. Function instrumentation is only
1083 done in the RTL level, so we disable tree inlining. */
1084 if (! flag_instrument_function_entry_exit)
1086 if (!flag_no_inline)
1088 if (flag_inline_functions)
1090 flag_inline_trees = 2;
1091 flag_inline_functions = 0;
1095 /* -Wextra implies -Wsign-compare, but not if explicitly
1097 if (warn_sign_compare == -1)
1098 warn_sign_compare = extra_warnings;
1100 /* Special format checking options don't work without -Wformat; warn if
1102 if (warn_format_y2k && !warn_format)
1103 warning ("-Wformat-y2k ignored without -Wformat");
1104 if (warn_format_extra_args && !warn_format)
1105 warning ("-Wformat-extra-args ignored without -Wformat");
1106 if (warn_format_zero_length && !warn_format)
1107 warning ("-Wformat-zero-length ignored without -Wformat");
1108 if (warn_format_nonliteral && !warn_format)
1109 warning ("-Wformat-nonliteral ignored without -Wformat");
1110 if (warn_format_security && !warn_format)
1111 warning ("-Wformat-security ignored without -Wformat");
1112 if (warn_missing_format_attribute && !warn_format)
1113 warning ("-Wmissing-format-attribute ignored without -Wformat");
1115 if (flag_preprocess_only)
1117 /* Open the output now. We must do so even if flag_no_output is
1118 on, because there may be other output than from the actual
1119 preprocessing (e.g. from -dM). */
1120 if (out_fname[0] == '\0')
1121 out_stream = stdout;
1123 out_stream = fopen (out_fname, "w");
1125 if (out_stream == NULL)
1127 fatal_error ("opening output file %s: %m", out_fname);
1131 if (num_in_fnames > 1)
1132 error ("too many filenames given. Type %s --help for usage",
1135 init_pp_output (out_stream);
1141 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1145 cpp_get_callbacks (parse_in)->file_change = cb_file_change;
1146 cpp_post_options (parse_in);
1148 saved_lineno = input_line;
1151 /* If an error has occurred in cpplib, note it so we fail
1153 errorcount += cpp_errors (parse_in);
1155 return flag_preprocess_only;
1158 /* Front end initialization common to C, ObjC and C++. */
1160 c_common_init (void)
1162 input_line = saved_lineno;
1164 /* Set up preprocessor arithmetic. Must be done after call to
1165 c_common_nodes_and_builtins for type nodes to be good. */
1166 cpp_opts->precision = TYPE_PRECISION (intmax_type_node);
1167 cpp_opts->char_precision = TYPE_PRECISION (char_type_node);
1168 cpp_opts->int_precision = TYPE_PRECISION (integer_type_node);
1169 cpp_opts->wchar_precision = TYPE_PRECISION (wchar_type_node);
1170 cpp_opts->unsigned_wchar = TREE_UNSIGNED (wchar_type_node);
1171 cpp_opts->bytes_big_endian = BYTES_BIG_ENDIAN;
1173 /* This can't happen until after wchar_precision and bytes_big_endian
1175 cpp_init_iconv (parse_in);
1177 if (flag_preprocess_only)
1179 if (finish_options (in_fnames[0]))
1180 preprocess_file (parse_in);
1184 /* Has to wait until now so that cpplib has its hash table. */
1190 /* Initialize the integrated preprocessor after debug output has been
1191 initialized; loop over each input file. */
1193 c_common_parse_file (int set_yydebug ATTRIBUTE_UNUSED)
1195 unsigned file_index;
1198 yydebug = set_yydebug;
1200 warning ("YYDEBUG not defined");
1209 /* Reset the state of the parser. */
1212 /* Reset cpplib's macros and start a new file. */
1213 cpp_undef_all (parse_in);
1216 if (! finish_options(in_fnames[file_index]))
1218 if (file_index == 0)
1223 } while (file_index < num_in_fnames);
1225 free_parser_stacks ();
1229 /* Common finish hook for the C, ObjC and C++ front ends. */
1231 c_common_finish (void)
1233 FILE *deps_stream = NULL;
1235 if (cpp_opts->deps.style != DEPS_NONE)
1237 /* If -M or -MM was seen without -MF, default output to the
1240 deps_stream = out_stream;
1243 deps_stream = fopen (deps_file, deps_append ? "a": "w");
1245 fatal_error ("opening dependency file %s: %m", deps_file);
1249 /* For performance, avoid tearing down cpplib's internal structures
1250 with cpp_destroy (). */
1251 errorcount += cpp_finish (parse_in, deps_stream);
1253 if (deps_stream && deps_stream != out_stream
1254 && (ferror (deps_stream) || fclose (deps_stream)))
1255 fatal_error ("closing dependency file %s: %m", deps_file);
1257 if (out_stream && (ferror (out_stream) || fclose (out_stream)))
1258 fatal_error ("when writing output to %s: %m", out_fname);
1261 /* Either of two environment variables can specify output of
1262 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1263 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1264 and DEPS_TARGET is the target to mention in the deps. They also
1265 result in dependency information being appended to the output file
1266 rather than overwriting it, and like Sun's compiler
1267 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1269 check_deps_environment_vars (void)
1273 GET_ENVIRONMENT (spec, "DEPENDENCIES_OUTPUT");
1275 cpp_opts->deps.style = DEPS_USER;
1278 GET_ENVIRONMENT (spec, "SUNPRO_DEPENDENCIES");
1281 cpp_opts->deps.style = DEPS_SYSTEM;
1282 cpp_opts->deps.ignore_main_file = true;
1288 /* Find the space before the DEPS_TARGET, if there is one. */
1289 char *s = strchr (spec, ' ');
1292 /* Let the caller perform MAKE quoting. */
1293 defer_opt (OPT_MT, s + 1);
1297 /* Command line -MF overrides environment variables and default. */
1305 /* Handle deferred command line switches. */
1307 handle_deferred_opts (void)
1311 for (i = 0; i < deferred_count; i++)
1313 struct deferred_opt *opt = &deferred_opts[i];
1315 if (opt->code == OPT_MT || opt->code == OPT_MQ)
1316 cpp_add_dependency_target (parse_in, opt->arg, opt->code == OPT_MQ);
1320 /* These settings are appropriate for GCC, but not necessarily so for
1321 cpplib as a library. */
1323 sanitize_cpp_opts (void)
1325 /* If we don't know what style of dependencies to output, complain
1326 if any other dependency switches have been given. */
1327 if (deps_seen && cpp_opts->deps.style == DEPS_NONE)
1328 error ("to generate dependencies you must specify either -M or -MM");
1330 /* -dM and dependencies suppress normal output; do it here so that
1331 the last -d[MDN] switch overrides earlier ones. */
1332 if (flag_dump_macros == 'M')
1335 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1336 -dM since at least glibc relies on -M -dM to work. */
1339 if (flag_dump_macros != 'M')
1340 flag_dump_macros = 0;
1341 flag_dump_includes = 0;
1344 cpp_opts->unsigned_char = !flag_signed_char;
1345 cpp_opts->stdc_0_in_system_headers = STDC_0_IN_SYSTEM_HEADERS;
1347 /* We want -Wno-long-long to override -pedantic -std=non-c99
1348 and/or -Wtraditional, whatever the ordering. */
1349 cpp_opts->warn_long_long
1350 = warn_long_long && ((!flag_isoc99 && pedantic) || warn_traditional);
1352 /* If we're generating preprocessor output, emit current directory
1353 if explicitly requested or if debugging information is enabled.
1354 ??? Maybe we should only do it for debugging formats that
1355 actually output the current directory? */
1356 if (flag_working_directory == -1)
1357 flag_working_directory = (debug_info_level != DINFO_LEVEL_NONE);
1358 cpp_opts->working_directory
1359 = flag_preprocess_only && flag_working_directory;
1362 /* Add include path with a prefix at the front of its name. */
1364 add_prefixed_path (const char *suffix, size_t chain)
1368 size_t prefix_len, suffix_len;
1370 suffix_len = strlen (suffix);
1371 prefix = iprefix ? iprefix : cpp_GCC_INCLUDE_DIR;
1372 prefix_len = iprefix ? strlen (iprefix) : cpp_GCC_INCLUDE_DIR_len;
1374 path = xmalloc (prefix_len + suffix_len + 1);
1375 memcpy (path, prefix, prefix_len);
1376 memcpy (path + prefix_len, suffix, suffix_len);
1377 path[prefix_len + suffix_len] = '\0';
1379 add_path (path, chain, 0);
1382 /* Handle -D, -U, -A, -imacros, and the first -include.
1383 TIF is the input file to which we will return after processing all
1384 the includes. Returns true on success. */
1386 finish_options (const char *tif)
1388 this_input_filename = tif;
1389 if (! cpp_find_main_file (parse_in, this_input_filename))
1392 if (!cpp_opts->preprocessed)
1396 cpp_change_file (parse_in, LC_ENTER, _("<built-in>"));
1397 cpp_init_builtins (parse_in, flag_hosted);
1398 c_cpp_builtins (parse_in);
1400 /* We're about to send user input to cpplib, so make it warn for
1401 things that we previously (when we sent it internal definitions)
1402 told it to not warn.
1404 C99 permits implementation-defined characters in identifiers.
1405 The documented meaning of -std= is to turn off extensions that
1406 conflict with the specified standard, and since a strictly
1407 conforming program cannot contain a '$', we do not condition
1408 their acceptance on the -std= setting. */
1409 cpp_opts->warn_dollars = (cpp_opts->pedantic && !cpp_opts->c99);
1411 cpp_change_file (parse_in, LC_RENAME, _("<command line>"));
1412 for (i = 0; i < deferred_count; i++)
1414 struct deferred_opt *opt = &deferred_opts[i];
1416 if (opt->code == OPT_D)
1417 cpp_define (parse_in, opt->arg);
1418 else if (opt->code == OPT_U)
1419 cpp_undef (parse_in, opt->arg);
1420 else if (opt->code == OPT_A)
1422 if (opt->arg[0] == '-')
1423 cpp_unassert (parse_in, opt->arg + 1);
1425 cpp_assert (parse_in, opt->arg);
1429 /* Handle -imacros after -D and -U. */
1430 for (i = 0; i < deferred_count; i++)
1432 struct deferred_opt *opt = &deferred_opts[i];
1434 if (opt->code == OPT_imacros
1435 && cpp_push_include (parse_in, opt->arg))
1437 /* Disable push_command_line_include callback for now. */
1438 include_cursor = deferred_count + 1;
1439 cpp_scan_nooutput (parse_in);
1445 push_command_line_include ();
1449 /* Give CPP the next file given by -include, if any. */
1451 push_command_line_include (void)
1453 while (include_cursor < deferred_count)
1455 struct deferred_opt *opt = &deferred_opts[include_cursor++];
1457 if (! cpp_opts->preprocessed && opt->code == OPT_include
1458 && cpp_push_include (parse_in, opt->arg))
1462 if (include_cursor == deferred_count)
1465 /* Restore the line map from <command line>. */
1466 if (! cpp_opts->preprocessed)
1467 cpp_change_file (parse_in, LC_LEAVE, NULL);
1468 /* -Wunused-macros should only warn about macros defined hereafter. */
1469 cpp_opts->warn_unused_macros = warn_unused_macros;
1470 cpp_push_main_file (parse_in);
1474 /* File change callback. Has to handle -include files. */
1476 cb_file_change (cpp_reader *pfile ATTRIBUTE_UNUSED,
1477 const struct line_map *new_map)
1479 if (flag_preprocess_only)
1480 pp_file_change (new_map);
1482 fe_file_change (new_map);
1484 if (new_map == 0 || (new_map->reason == LC_LEAVE && MAIN_FILE_P (new_map)))
1485 push_command_line_include ();
1488 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1489 extensions if ISO). There is no concept of gnu94. */
1491 set_std_c89 (int c94, int iso)
1493 cpp_set_lang (parse_in, c94 ? CLK_STDC94: iso ? CLK_STDC89: CLK_GNUC89);
1496 flag_no_gnu_keywords = iso;
1497 flag_no_nonansi_builtin = iso;
1500 flag_writable_strings = 0;
1503 /* Set the C 99 standard (without GNU extensions if ISO). */
1505 set_std_c99 (int iso)
1507 cpp_set_lang (parse_in, iso ? CLK_STDC99: CLK_GNUC99);
1509 flag_no_nonansi_builtin = iso;
1513 flag_writable_strings = 0;
1516 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1518 set_std_cxx98 (int iso)
1520 cpp_set_lang (parse_in, iso ? CLK_CXX98: CLK_GNUCXX);
1521 flag_no_gnu_keywords = iso;
1522 flag_no_nonansi_builtin = iso;
1526 /* Handle setting implicit to ON. */
1528 set_Wimplicit (int on)
1531 warn_implicit_int = on;
1534 if (mesg_implicit_function_declaration != 2)
1535 mesg_implicit_function_declaration = 1;
1538 mesg_implicit_function_declaration = 0;
1541 /* Args to -d specify what to dump. Silently ignore
1542 unrecognized options; they may be aimed at toplev.c. */
1544 handle_OPT_d (const char *arg)
1548 while ((c = *arg++) != '\0')
1551 case 'M': /* Dump macros only. */
1552 case 'N': /* Dump names. */
1553 case 'D': /* Dump definitions. */
1554 flag_dump_macros = c;
1558 flag_dump_includes = 1;