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
49 static int saved_lineno;
52 static cpp_options *cpp_opts;
55 static const char *in_fname;
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 print_help (void);
102 static void handle_OPT_d (const char *);
103 static void set_std_cxx98 (int);
104 static void set_std_c89 (int, int);
105 static void set_std_c99 (int);
106 static void check_deps_environment_vars (void);
107 static void handle_deferred_opts (void);
108 static void sanitize_cpp_opts (void);
109 static void add_prefixed_path (const char *, size_t);
110 static void push_command_line_include (void);
111 static void cb_file_change (cpp_reader *, const struct line_map *);
112 static void finish_options (void);
114 #ifndef STDC_0_IN_SYSTEM_HEADERS
115 #define STDC_0_IN_SYSTEM_HEADERS 0
118 /* Holds switches parsed by c_common_handle_option (), but whose
119 handling is deferred to c_common_post_options (). */
120 static void defer_opt (enum opt_code, const char *);
121 static struct deferred_opt
127 /* Complain that switch CODE expects an argument but none was
128 provided. OPT was the command-line option. Return FALSE to get
129 the default message in opts.c, TRUE if we provide a specialized
132 c_common_missing_argument (const char *opt, size_t code)
137 /* Pick up the default message. */
140 case OPT_fconstant_string_class_:
141 error ("no class name specified with \"%s\"", opt);
145 error ("assertion missing after \"%s\"", opt);
150 error ("macro name missing after \"%s\"", opt);
157 error ("missing path after \"%s\"", opt);
166 error ("missing filename after \"%s\"", opt);
171 error ("missing makefile target after \"%s\"", opt);
178 /* Defer option CODE with argument ARG. */
180 defer_opt (enum opt_code code, const char *arg)
182 deferred_opts[deferred_count].code = code;
183 deferred_opts[deferred_count].arg = arg;
187 /* Common initialization before parsing options. */
189 c_common_init_options (unsigned int argc, const char **argv ATTRIBUTE_UNUSED)
191 static const unsigned int lang_flags[] = {CL_C, CL_ObjC, CL_CXX, CL_ObjCXX};
194 /* This is conditionalized only because that is the way the front
195 ends used to do it. Maybe this should be unconditional? */
196 if (c_dialect_cxx ())
198 /* By default wrap lines at 80 characters. Is getenv
199 ("COLUMNS") preferable? */
200 diagnostic_line_cutoff (global_dc) = 80;
201 /* By default, emit location information once for every
202 diagnostic message. */
203 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
206 parse_in = cpp_create_reader (c_dialect_cxx () ? CLK_GNUCXX: CLK_GNUC89,
209 cpp_opts = cpp_get_options (parse_in);
210 cpp_opts->dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
211 cpp_opts->objc = c_dialect_objc ();
213 /* Reset to avoid warnings on internal definitions. We set it just
214 before passing on command-line options to cpplib. */
215 cpp_opts->warn_dollars = 0;
217 flag_const_strings = c_dialect_cxx ();
218 flag_exceptions = c_dialect_cxx ();
219 warn_pointer_arith = c_dialect_cxx ();
221 deferred_opts = (struct deferred_opt *)
222 xmalloc (argc * sizeof (struct deferred_opt));
224 result = lang_flags[c_language];
226 /* If potentially preprocessing Fortran we have to accept its front
227 end options since the driver passes most of them through. */
229 if (c_language == clk_c && argc > 2
230 && !strcmp (argv[2], "-traditional-cpp" ))
232 permit_fortran_options = true;
240 /* Handle switch SCODE with argument ARG. ON is true, unless no-
241 form of an -f or -W option was given. Returns 0 if the switch was
242 invalid, a negative number to prevent language-independent
243 processing in toplev.c (a hack necessary for the short-term). */
245 c_common_handle_option (size_t scode, const char *arg, int value)
247 const struct cl_option *option = &cl_options[scode];
248 enum opt_code code = (enum opt_code) scode;
254 result = permit_fortran_options;
261 case OPT__output_pch_:
266 defer_opt (code, arg);
270 cpp_opts->discard_comments = 0;
274 cpp_opts->discard_comments = 0;
275 cpp_opts->discard_comments_in_macro_exp = 0;
279 defer_opt (code, arg);
283 flag_preprocess_only = 1;
287 cpp_opts->print_include_names = 1;
291 if (strcmp (arg, "-"))
292 add_path (xstrdup (arg), BRACKET, 0);
295 if (quote_chain_split)
296 error ("-I- specified twice");
297 quote_chain_split = true;
298 split_quote_chain ();
304 /* When doing dependencies with -M or -MM, suppress normal
305 preprocessed output, but still do -dM etc. as software
306 depends on this. Preprocessed output does occur if -MD, -MMD
307 or environment var dependency generation is used. */
308 cpp_opts->deps.style = (code == OPT_M ? DEPS_SYSTEM: DEPS_USER);
310 cpp_opts->inhibit_warnings = 1;
315 cpp_opts->deps.style = (code == OPT_MD ? DEPS_SYSTEM: DEPS_USER);
326 cpp_opts->deps.missing_files = true;
331 cpp_opts->deps.phony_targets = true;
337 defer_opt (code, arg);
341 flag_no_line_commands = 1;
345 defer_opt (code, arg);
355 set_Wimplicit (value);
356 warn_char_subscripts = value;
357 warn_missing_braces = value;
358 warn_parentheses = value;
359 warn_return_type = value;
360 warn_sequence_point = value; /* Was C only. */
361 if (c_dialect_cxx ())
362 warn_sign_compare = value;
364 warn_strict_aliasing = value;
366 /* Only warn about unknown pragmas that are not in system
368 warn_unknown_pragmas = value;
370 /* We save the value of warn_uninitialized, since if they put
371 -Wuninitialized on the command line, we need to generate a
372 warning about not using it without also specifying -O. */
373 if (warn_uninitialized != 1)
374 warn_uninitialized = (value ? 2 : 0);
376 if (!c_dialect_cxx ())
377 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding
378 can turn it off only if it's not explicit. */
379 warn_main = value * 2;
382 /* C++-specific warnings. */
383 warn_nonvdtor = value;
384 warn_reorder = value;
385 warn_nontemplate_friend = value;
388 cpp_opts->warn_trigraphs = value;
389 cpp_opts->warn_comments = value;
390 cpp_opts->warn_num_sign_change = value;
391 cpp_opts->warn_multichar = value; /* Was C++ only. */
394 case OPT_Wbad_function_cast:
395 warn_bad_function_cast = value;
399 warn_cast_qual = value;
402 case OPT_Wchar_subscripts:
403 warn_char_subscripts = value;
408 cpp_opts->warn_comments = value;
411 case OPT_Wconversion:
412 warn_conversion = value;
415 case OPT_Wctor_dtor_privacy:
416 warn_ctor_dtor_privacy = value;
419 case OPT_Wdeprecated:
420 warn_deprecated = value;
421 cpp_opts->warn_deprecated = value;
424 case OPT_Wdiv_by_zero:
425 warn_div_by_zero = value;
432 case OPT_Wendif_labels:
433 cpp_opts->warn_endif_labels = value;
437 cpp_opts->warnings_are_errors = value;
440 case OPT_Werror_implicit_function_declaration:
441 mesg_implicit_function_declaration = 2;
444 case OPT_Wfloat_equal:
445 warn_float_equal = value;
453 set_Wformat (atoi (arg));
456 case OPT_Wformat_extra_args:
457 warn_format_extra_args = value;
460 case OPT_Wformat_nonliteral:
461 warn_format_nonliteral = value;
464 case OPT_Wformat_security:
465 warn_format_security = value;
468 case OPT_Wformat_y2k:
469 warn_format_y2k = value;
472 case OPT_Wformat_zero_length:
473 warn_format_zero_length = value;
477 set_Wimplicit (value);
480 case OPT_Wimplicit_function_declaration:
481 mesg_implicit_function_declaration = value;
484 case OPT_Wimplicit_int:
485 warn_implicit_int = value;
489 cpp_opts->warn_import = value;
492 case OPT_Winvalid_offsetof:
493 warn_invalid_offsetof = value;
496 case OPT_Winvalid_pch:
497 cpp_opts->warn_invalid_pch = value;
501 warn_long_long = value;
511 case OPT_Wmissing_braces:
512 warn_missing_braces = value;
515 case OPT_Wmissing_declarations:
516 warn_missing_declarations = value;
519 case OPT_Wmissing_format_attribute:
520 warn_missing_format_attribute = value;
523 case OPT_Wmissing_prototypes:
524 warn_missing_prototypes = value;
528 cpp_opts->warn_multichar = value;
531 case OPT_Wnested_externs:
532 warn_nested_externs = value;
535 case OPT_Wnon_template_friend:
536 warn_nontemplate_friend = value;
539 case OPT_Wnon_virtual_dtor:
540 warn_nonvdtor = value;
544 warn_nonnull = value;
547 case OPT_Wold_style_cast:
548 warn_old_style_cast = value;
551 case OPT_Woverloaded_virtual:
552 warn_overloaded_virtual = value;
555 case OPT_Wparentheses:
556 warn_parentheses = value;
559 case OPT_Wpmf_conversions:
560 warn_pmf2ptr = value;
563 case OPT_Wpointer_arith:
564 warn_pointer_arith = value;
568 warn_protocol = value;
572 warn_selector = value;
575 case OPT_Wredundant_decls:
576 warn_redundant_decls = value;
580 warn_reorder = value;
583 case OPT_Wreturn_type:
584 warn_return_type = value;
587 case OPT_Wsequence_point:
588 warn_sequence_point = value;
591 case OPT_Wsign_compare:
592 warn_sign_compare = value;
595 case OPT_Wsign_promo:
596 warn_sign_promo = value;
599 case OPT_Wstrict_prototypes:
600 warn_strict_prototypes = value;
607 case OPT_Wsystem_headers:
608 cpp_opts->warn_system_headers = value;
611 case OPT_Wtraditional:
612 warn_traditional = value;
613 cpp_opts->warn_traditional = value;
617 cpp_opts->warn_trigraphs = value;
620 case OPT_Wundeclared_selector:
621 warn_undeclared_selector = value;
625 cpp_opts->warn_undef = value;
628 case OPT_Wunknown_pragmas:
629 /* Set to greater than 1, so that even unknown pragmas in
630 system headers will be warned about. */
631 warn_unknown_pragmas = value * 2;
634 case OPT_Wunused_macros:
635 warn_unused_macros = value;
638 case OPT_Wwrite_strings:
639 if (!c_dialect_cxx ())
640 flag_const_strings = value;
642 warn_write_strings = value;
646 if (!c_dialect_cxx ())
647 set_std_c89 (false, true);
649 set_std_cxx98 (true);
656 case OPT_fcond_mismatch:
657 if (!c_dialect_cxx ())
659 flag_cond_mismatch = value;
664 case OPT_fall_virtual:
665 case OPT_fenum_int_equiv:
666 case OPT_fguiding_decls:
668 case OPT_fhuge_objects:
670 case OPT_fname_mangling_version_:
672 case OPT_fnonnull_objects:
674 case OPT_fstrict_prototype:
675 case OPT_fthis_is_variable:
676 case OPT_fvtable_thunks:
678 warning ("switch \"%s\" is no longer supported", option->opt_text);
681 case OPT_fabi_version_:
682 flag_abi_version = value;
685 case OPT_faccess_control:
686 flag_access_control = value;
689 case OPT_falt_external_templates:
690 flag_alt_external_templates = value;
692 flag_external_templates = true;
694 warning ("switch \"%s\" is deprecated, please see documentation "
695 "for details", option->opt_text);
699 flag_no_asm = !value;
703 flag_no_builtin = !value;
710 disable_builtin_function (arg);
713 case OPT_fdollars_in_identifiers:
714 cpp_opts->dollars_in_ident = value;
718 if (!dump_switch_p (arg))
722 case OPT_ffreestanding:
724 /* Fall through... */
727 flag_no_builtin = !value;
728 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
729 if (!value && warn_main == 2)
733 case OPT_fshort_double:
734 flag_short_double = value;
737 case OPT_fshort_enums:
738 flag_short_enums = value;
741 case OPT_fshort_wchar:
742 flag_short_wchar = value;
745 case OPT_fsigned_bitfields:
746 flag_signed_bitfields = value;
747 explicit_flag_signed_bitfields = 1;
750 case OPT_fsigned_char:
751 flag_signed_char = value;
754 case OPT_funsigned_bitfields:
755 flag_signed_bitfields = !value;
756 explicit_flag_signed_bitfields = 1;
759 case OPT_funsigned_char:
760 flag_signed_char = !value;
764 flag_check_new = value;
767 case OPT_fconserve_space:
768 flag_conserve_space = value;
771 case OPT_fconst_strings:
772 flag_const_strings = value;
775 case OPT_fconstant_string_class_:
776 constant_string_class_name = arg;
779 case OPT_fdefault_inline:
780 flag_default_inline = value;
783 case OPT_felide_constructors:
784 flag_elide_constructors = value;
787 case OPT_fenforce_eh_specs:
788 flag_enforce_eh_specs = value;
791 case OPT_fexternal_templates:
792 flag_external_templates = 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_fnonansi_builtins:
840 flag_no_nonansi_builtin = !value;
843 case OPT_foperator_names:
844 cpp_opts->operator_names = value;
847 case OPT_foptional_diags:
848 flag_optional_diags = value;
852 cpp_opts->restore_pch_deps = value;
855 case OPT_fpermissive:
856 flag_permissive = value;
859 case OPT_fpreprocessed:
860 cpp_opts->preprocessed = value;
864 flag_use_repository = value;
866 flag_implicit_templates = 0;
873 case OPT_fshow_column:
874 cpp_opts->show_column = value;
878 flag_detailed_statistics = value;
882 /* It is documented that we silently ignore silly values. */
883 if (value >= 1 && value <= 100)
884 cpp_opts->tabstop = value;
887 case OPT_fexec_charset_:
888 cpp_opts->narrow_charset = arg;
891 case OPT_fwide_exec_charset_:
892 cpp_opts->wide_charset = arg;
895 case OPT_ftemplate_depth_:
896 max_tinst_depth = value;
900 flag_vtable_gc = value;
903 case OPT_fuse_cxa_atexit:
904 flag_use_cxa_atexit = value;
912 flag_gen_declaration = 1;
916 add_path (xstrdup (arg), AFTER, 0);
921 defer_opt (code, arg);
933 add_path (xstrdup (arg), SYSTEM, 0);
936 case OPT_iwithprefix:
937 add_prefixed_path (arg, SYSTEM);
940 case OPT_iwithprefixbefore:
941 add_prefixed_path (arg, BRACKET);
945 cpp_set_lang (parse_in, CLK_ASM);
946 cpp_opts->dollars_in_ident = false;
965 error ("output filename specified twice");
968 /* We need to handle the -pedantic switches here, rather than in
969 c_common_post_options, so that a subsequent -Wno-endif-labels
970 is not overridden. */
971 case OPT_pedantic_errors:
972 cpp_opts->pedantic_errors = 1;
975 cpp_opts->pedantic = 1;
976 cpp_opts->warn_endif_labels = 1;
979 case OPT_print_objc_runtime_info:
980 print_struct_values = 1;
988 case OPT_std_gnu__98:
989 set_std_cxx98 (code == OPT_std_c__98 /* ISO */);
993 case OPT_std_iso9899_1990:
994 case OPT_std_iso9899_199409:
995 set_std_c89 (code == OPT_std_iso9899_199409 /* c94 */, true /* ISO */);
999 set_std_c89 (false /* c94 */, false /* ISO */);
1004 case OPT_std_iso9899_1999:
1005 case OPT_std_iso9899_199x:
1006 set_std_c99 (true /* ISO */);
1011 set_std_c99 (false /* ISO */);
1015 cpp_opts->trigraphs = 1;
1018 case OPT_traditional_cpp:
1019 cpp_opts->traditional = 1;
1027 cpp_opts->inhibit_warnings = 1;
1038 /* Handle FILENAME from the command line. */
1040 c_common_handle_filename (const char *filename)
1043 in_fname = filename;
1044 else if (!out_fname)
1045 out_fname = filename;
1047 error ("output filename specified twice");
1050 /* Post-switch processing. */
1052 c_common_post_options (const char **pfilename)
1054 /* Canonicalize the input and output filenames. */
1055 if (in_fname == NULL || !strcmp (in_fname, "-"))
1058 if (out_fname == NULL || !strcmp (out_fname, "-"))
1061 if (cpp_opts->deps.style == DEPS_NONE)
1062 check_deps_environment_vars ();
1064 handle_deferred_opts ();
1066 sanitize_cpp_opts ();
1068 register_include_chains (parse_in, sysroot, iprefix,
1069 std_inc, std_cxx_inc && c_dialect_cxx (), verbose);
1071 flag_inline_trees = 1;
1073 /* Use tree inlining if possible. Function instrumentation is only
1074 done in the RTL level, so we disable tree inlining. */
1075 if (! flag_instrument_function_entry_exit)
1077 if (!flag_no_inline)
1079 if (flag_inline_functions)
1081 flag_inline_trees = 2;
1082 flag_inline_functions = 0;
1086 /* -Wextra implies -Wsign-compare, but not if explicitly
1088 if (warn_sign_compare == -1)
1089 warn_sign_compare = extra_warnings;
1091 /* Special format checking options don't work without -Wformat; warn if
1093 if (warn_format_y2k && !warn_format)
1094 warning ("-Wformat-y2k ignored without -Wformat");
1095 if (warn_format_extra_args && !warn_format)
1096 warning ("-Wformat-extra-args ignored without -Wformat");
1097 if (warn_format_zero_length && !warn_format)
1098 warning ("-Wformat-zero-length ignored without -Wformat");
1099 if (warn_format_nonliteral && !warn_format)
1100 warning ("-Wformat-nonliteral ignored without -Wformat");
1101 if (warn_format_security && !warn_format)
1102 warning ("-Wformat-security ignored without -Wformat");
1103 if (warn_missing_format_attribute && !warn_format)
1104 warning ("-Wmissing-format-attribute ignored without -Wformat");
1106 if (flag_preprocess_only)
1108 /* Open the output now. We must do so even if flag_no_output is
1109 on, because there may be other output than from the actual
1110 preprocessing (e.g. from -dM). */
1111 if (out_fname[0] == '\0')
1112 out_stream = stdout;
1114 out_stream = fopen (out_fname, "w");
1116 if (out_stream == NULL)
1118 fatal_error ("opening output file %s: %m", out_fname);
1122 init_pp_output (out_stream);
1128 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1132 cpp_get_callbacks (parse_in)->file_change = cb_file_change;
1134 /* NOTE: we use in_fname here, not the one supplied. */
1135 *pfilename = cpp_read_main_file (parse_in, in_fname);
1137 saved_lineno = input_line;
1140 /* If an error has occurred in cpplib, note it so we fail
1142 errorcount += cpp_errors (parse_in);
1144 return flag_preprocess_only;
1147 /* Front end initialization common to C, ObjC and C++. */
1149 c_common_init (void)
1151 input_line = saved_lineno;
1153 /* Set up preprocessor arithmetic. Must be done after call to
1154 c_common_nodes_and_builtins for type nodes to be good. */
1155 cpp_opts->precision = TYPE_PRECISION (intmax_type_node);
1156 cpp_opts->char_precision = TYPE_PRECISION (char_type_node);
1157 cpp_opts->int_precision = TYPE_PRECISION (integer_type_node);
1158 cpp_opts->wchar_precision = TYPE_PRECISION (wchar_type_node);
1159 cpp_opts->unsigned_wchar = TREE_UNSIGNED (wchar_type_node);
1160 cpp_opts->bytes_big_endian = BYTES_BIG_ENDIAN;
1162 /* This can't happen until after wchar_precision and bytes_big_endian
1164 cpp_init_iconv (parse_in);
1166 if (flag_preprocess_only)
1169 preprocess_file (parse_in);
1173 /* Has to wait until now so that cpplib has its hash table. */
1179 /* A thin wrapper around the real parser that initializes the
1180 integrated preprocessor after debug output has been initialized.
1181 Also, make sure the start_source_file debug hook gets called for
1182 the primary source file. */
1184 c_common_parse_file (int set_yydebug ATTRIBUTE_UNUSED)
1187 yydebug = set_yydebug;
1189 warning ("YYDEBUG not defined");
1195 free_parser_stacks ();
1198 /* Common finish hook for the C, ObjC and C++ front ends. */
1200 c_common_finish (void)
1202 FILE *deps_stream = NULL;
1204 if (cpp_opts->deps.style != DEPS_NONE)
1206 /* If -M or -MM was seen without -MF, default output to the
1209 deps_stream = out_stream;
1212 deps_stream = fopen (deps_file, deps_append ? "a": "w");
1214 fatal_error ("opening dependency file %s: %m", deps_file);
1218 /* For performance, avoid tearing down cpplib's internal structures
1219 with cpp_destroy (). */
1220 errorcount += cpp_finish (parse_in, deps_stream);
1222 if (deps_stream && deps_stream != out_stream
1223 && (ferror (deps_stream) || fclose (deps_stream)))
1224 fatal_error ("closing dependency file %s: %m", deps_file);
1226 if (out_stream && (ferror (out_stream) || fclose (out_stream)))
1227 fatal_error ("when writing output to %s: %m", out_fname);
1230 /* Either of two environment variables can specify output of
1231 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1232 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1233 and DEPS_TARGET is the target to mention in the deps. They also
1234 result in dependency information being appended to the output file
1235 rather than overwriting it, and like Sun's compiler
1236 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1238 check_deps_environment_vars (void)
1242 GET_ENVIRONMENT (spec, "DEPENDENCIES_OUTPUT");
1244 cpp_opts->deps.style = DEPS_USER;
1247 GET_ENVIRONMENT (spec, "SUNPRO_DEPENDENCIES");
1250 cpp_opts->deps.style = DEPS_SYSTEM;
1251 cpp_opts->deps.ignore_main_file = true;
1257 /* Find the space before the DEPS_TARGET, if there is one. */
1258 char *s = strchr (spec, ' ');
1261 /* Let the caller perform MAKE quoting. */
1262 defer_opt (OPT_MT, s + 1);
1266 /* Command line -MF overrides environment variables and default. */
1274 /* Handle deferred command line switches. */
1276 handle_deferred_opts (void)
1280 for (i = 0; i < deferred_count; i++)
1282 struct deferred_opt *opt = &deferred_opts[i];
1284 if (opt->code == OPT_MT || opt->code == OPT_MQ)
1285 cpp_add_dependency_target (parse_in, opt->arg, opt->code == OPT_MQ);
1289 /* These settings are appropriate for GCC, but not necessarily so for
1290 cpplib as a library. */
1292 sanitize_cpp_opts (void)
1294 /* If we don't know what style of dependencies to output, complain
1295 if any other dependency switches have been given. */
1296 if (deps_seen && cpp_opts->deps.style == DEPS_NONE)
1297 error ("to generate dependencies you must specify either -M or -MM");
1299 /* -dM and dependencies suppress normal output; do it here so that
1300 the last -d[MDN] switch overrides earlier ones. */
1301 if (flag_dump_macros == 'M')
1304 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1305 -dM since at least glibc relies on -M -dM to work. */
1308 if (flag_dump_macros != 'M')
1309 flag_dump_macros = 0;
1310 flag_dump_includes = 0;
1313 cpp_opts->unsigned_char = !flag_signed_char;
1314 cpp_opts->stdc_0_in_system_headers = STDC_0_IN_SYSTEM_HEADERS;
1316 /* We want -Wno-long-long to override -pedantic -std=non-c99
1317 and/or -Wtraditional, whatever the ordering. */
1318 cpp_opts->warn_long_long
1319 = warn_long_long && ((!flag_isoc99 && pedantic) || warn_traditional);
1322 /* Add include path with a prefix at the front of its name. */
1324 add_prefixed_path (const char *suffix, size_t chain)
1328 size_t prefix_len, suffix_len;
1330 suffix_len = strlen (suffix);
1331 prefix = iprefix ? iprefix : cpp_GCC_INCLUDE_DIR;
1332 prefix_len = iprefix ? strlen (iprefix) : cpp_GCC_INCLUDE_DIR_len;
1334 path = xmalloc (prefix_len + suffix_len + 1);
1335 memcpy (path, prefix, prefix_len);
1336 memcpy (path + prefix_len, suffix, suffix_len);
1337 path[prefix_len + suffix_len] = '\0';
1339 add_path (path, chain, 0);
1342 /* Handle -D, -U, -A, -imacros, and the first -include. */
1344 finish_options (void)
1346 if (!cpp_opts->preprocessed)
1350 cpp_change_file (parse_in, LC_RENAME, _("<built-in>"));
1351 cpp_init_builtins (parse_in, flag_hosted);
1352 c_cpp_builtins (parse_in);
1354 /* We're about to send user input to cpplib, so make it warn for
1355 things that we previously (when we sent it internal definitions)
1356 told it to not warn.
1358 C99 permits implementation-defined characters in identifiers.
1359 The documented meaning of -std= is to turn off extensions that
1360 conflict with the specified standard, and since a strictly
1361 conforming program cannot contain a '$', we do not condition
1362 their acceptance on the -std= setting. */
1363 cpp_opts->warn_dollars = (cpp_opts->pedantic && !cpp_opts->c99);
1365 cpp_change_file (parse_in, LC_RENAME, _("<command line>"));
1366 for (i = 0; i < deferred_count; i++)
1368 struct deferred_opt *opt = &deferred_opts[i];
1370 if (opt->code == OPT_D)
1371 cpp_define (parse_in, opt->arg);
1372 else if (opt->code == OPT_U)
1373 cpp_undef (parse_in, opt->arg);
1374 else if (opt->code == OPT_A)
1376 if (opt->arg[0] == '-')
1377 cpp_unassert (parse_in, opt->arg + 1);
1379 cpp_assert (parse_in, opt->arg);
1383 /* Handle -imacros after -D and -U. */
1384 for (i = 0; i < deferred_count; i++)
1386 struct deferred_opt *opt = &deferred_opts[i];
1388 if (opt->code == OPT_imacros
1389 && cpp_push_include (parse_in, opt->arg))
1390 cpp_scan_nooutput (parse_in);
1394 push_command_line_include ();
1397 /* Give CPP the next file given by -include, if any. */
1399 push_command_line_include (void)
1401 if (cpp_opts->preprocessed)
1404 while (include_cursor < deferred_count)
1406 struct deferred_opt *opt = &deferred_opts[include_cursor++];
1408 if (opt->code == OPT_include && cpp_push_include (parse_in, opt->arg))
1412 if (include_cursor == deferred_count)
1414 free (deferred_opts);
1415 /* Restore the line map from <command line>. */
1416 cpp_change_file (parse_in, LC_RENAME, main_input_filename);
1417 /* -Wunused-macros should only warn about macros defined hereafter. */
1418 cpp_opts->warn_unused_macros = warn_unused_macros;
1423 /* File change callback. Has to handle -include files. */
1425 cb_file_change (cpp_reader *pfile ATTRIBUTE_UNUSED,
1426 const struct line_map *new_map)
1428 if (flag_preprocess_only)
1429 pp_file_change (new_map);
1431 fe_file_change (new_map);
1433 if (new_map->reason == LC_LEAVE && MAIN_FILE_P (new_map))
1434 push_command_line_include ();
1437 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1438 extensions if ISO). There is no concept of gnu94. */
1440 set_std_c89 (int c94, int iso)
1442 cpp_set_lang (parse_in, c94 ? CLK_STDC94: iso ? CLK_STDC89: CLK_GNUC89);
1445 flag_no_gnu_keywords = iso;
1446 flag_no_nonansi_builtin = iso;
1447 flag_noniso_default_format_attributes = !iso;
1450 flag_writable_strings = 0;
1453 /* Set the C 99 standard (without GNU extensions if ISO). */
1455 set_std_c99 (int iso)
1457 cpp_set_lang (parse_in, iso ? CLK_STDC99: CLK_GNUC99);
1459 flag_no_nonansi_builtin = iso;
1460 flag_noniso_default_format_attributes = !iso;
1464 flag_writable_strings = 0;
1467 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1469 set_std_cxx98 (int iso)
1471 cpp_set_lang (parse_in, iso ? CLK_CXX98: CLK_GNUCXX);
1472 flag_no_gnu_keywords = iso;
1473 flag_no_nonansi_builtin = iso;
1474 flag_noniso_default_format_attributes = !iso;
1478 /* Handle setting implicit to ON. */
1480 set_Wimplicit (int on)
1483 warn_implicit_int = on;
1486 if (mesg_implicit_function_declaration != 2)
1487 mesg_implicit_function_declaration = 1;
1490 mesg_implicit_function_declaration = 0;
1493 /* Args to -d specify what to dump. Silently ignore
1494 unrecognized options; they may be aimed at toplev.c. */
1496 handle_OPT_d (const char *arg)
1500 while ((c = *arg++) != '\0')
1503 case 'M': /* Dump macros only. */
1504 case 'N': /* Dump names. */
1505 case 'D': /* Dump definitions. */
1506 flag_dump_macros = c;
1510 flag_dump_includes = 1;
1515 /* Handle --help output. */
1519 /* To keep the lines from getting too long for some compilers, limit
1520 to about 500 characters (6 lines) per chunk. */
1523 -include <file> Include the contents of <file> before other files\n\
1524 -imacros <file> Accept definition of macros in <file>\n\
1525 -iprefix <path> Specify <path> as a prefix for next two options\n\
1526 -iwithprefix <dir> Add <dir> to the end of the system include path\n\
1527 -iwithprefixbefore <dir> Add <dir> to the end of the main include path\n\
1528 -isystem <dir> Add <dir> to the start of the system include path\n\
1531 -idirafter <dir> Add <dir> to the end of the system include path\n\
1532 -I <dir> Add <dir> to the end of the main include path\n\
1533 -I- Fine-grained include path control; see info docs\n\
1534 -nostdinc Do not search system include directories\n\
1535 (dirs specified with -isystem will still be used)\n\
1536 -nostdinc++ Do not search system include directories for C++\n\
1537 -o <file> Put output into <file>\n\
1540 -trigraphs Support ISO C trigraphs\n\
1541 -std=<std name> Specify the conformance standard; one of:\n\
1542 gnu89, gnu99, c89, c99, iso9899:1990,\n\
1543 iso9899:199409, iso9899:1999, c++98\n\
1544 -w Inhibit warning messages\n\
1545 -W[no-]trigraphs Warn if trigraphs are encountered\n\
1546 -W[no-]comment{s} Warn if one comment starts inside another\n\
1549 -W[no-]traditional Warn about features not present in traditional C\n\
1550 -W[no-]undef Warn if an undefined macro is used by #if\n\
1551 -W[no-]import Warn about the use of the #import directive\n\
1554 -W[no-]error Treat all warnings as errors\n\
1555 -W[no-]system-headers Do not suppress warnings from system headers\n\
1556 -W[no-]all Enable most preprocessor warnings\n\
1559 -M Generate make dependencies\n\
1560 -MM As -M, but ignore system header files\n\
1561 -MD Generate make dependencies and compile\n\
1562 -MMD As -MD, but ignore system header files\n\
1563 -MF <file> Write dependency output to the given file\n\
1564 -MG Treat missing header file as generated files\n\
1567 -MP Generate phony targets for all headers\n\
1568 -MQ <target> Add a MAKE-quoted target\n\
1569 -MT <target> Add an unquoted target\n\
1572 -D<macro> Define a <macro> with string '1' as its value\n\
1573 -D<macro>=<val> Define a <macro> with <val> as its value\n\
1574 -A<question>=<answer> Assert the <answer> to <question>\n\
1575 -A-<question>=<answer> Disable the <answer> to <question>\n\
1576 -U<macro> Undefine <macro> \n\
1577 -v Display the version number\n\
1580 -H Print the name of header files as they are used\n\
1581 -C Do not discard comments\n\
1582 -dM Display a list of macro definitions active at end\n\
1583 -dD Preserve macro definitions in output\n\
1584 -dN As -dD except that only the names are preserved\n\
1585 -dI Include #include directives in the output\n\
1588 -f[no-]preprocessed Treat the input file as already preprocessed\n\
1589 -ftabstop=<number> Distance between tab stops for column reporting\n\
1590 -ftarget-charset=<c> Convert all strings and character constants\n\
1591 to character set <c>\n\
1592 -ftarget-wide-charset=<c> Convert all wide strings and character constants\n\
1593 to character set <c>\n\
1596 -isysroot <dir> Set <dir> to be the system root directory\n\
1597 -P Do not generate #line directives\n\
1598 -remap Remap file names when including files\n\
1599 --help Display this information\n\