1 /* C/ObjC/C++ command line option handling.
2 Copyright (C) 2002, 2003, 2004, 2005 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. */
42 #ifndef DOLLARS_IN_IDENTIFIERS
43 # define DOLLARS_IN_IDENTIFIERS true
46 #ifndef TARGET_SYSTEM_ROOT
47 # define TARGET_SYSTEM_ROOT NULL
51 #define TARGET_OPTF(ARG)
55 static cpp_options *cpp_opts;
58 static const char *this_input_filename;
60 /* Filename and stream for preprocessed output. */
61 static const char *out_fname;
62 static FILE *out_stream;
64 /* Append dependencies to deps_file. */
65 static bool deps_append;
67 /* If dependency switches (-MF etc.) have been given. */
68 static bool deps_seen;
73 /* Dependency output file. */
74 static const char *deps_file;
76 /* The prefix given by -iprefix, if any. */
77 static const char *iprefix;
79 /* The system root, if any. Overridden by -isysroot. */
80 static const char *sysroot = TARGET_SYSTEM_ROOT;
82 /* Zero disables all standard directories for headers. */
83 static bool std_inc = true;
85 /* Zero disables the C++-specific standard directories for headers. */
86 static bool std_cxx_inc = true;
88 /* If the quote chain has been split by -I-. */
89 static bool quote_chain_split;
91 /* If -Wunused-macros. */
92 static bool warn_unused_macros;
94 /* If -Wvariadic-macros. */
95 static bool warn_variadic_macros = true;
97 /* Number of deferred options. */
98 static size_t deferred_count;
100 /* Number of deferred options scanned for -include. */
101 static size_t include_cursor;
103 static void set_Wimplicit (int);
104 static void handle_OPT_d (const char *);
105 static void set_std_cxx98 (int);
106 static void set_std_c89 (int, int);
107 static void set_std_c99 (int);
108 static void check_deps_environment_vars (void);
109 static void handle_deferred_opts (void);
110 static void sanitize_cpp_opts (void);
111 static void add_prefixed_path (const char *, size_t);
112 static void push_command_line_include (void);
113 static void cb_file_change (cpp_reader *, const struct line_map *);
114 static void cb_dir_change (cpp_reader *, const char *);
115 static void finish_options (void);
117 #ifndef STDC_0_IN_SYSTEM_HEADERS
118 #define STDC_0_IN_SYSTEM_HEADERS 0
121 /* Holds switches parsed by c_common_handle_option (), but whose
122 handling is deferred to c_common_post_options (). */
123 static void defer_opt (enum opt_code, const char *);
124 static struct deferred_opt
130 /* Complain that switch CODE expects an argument but none was
131 provided. OPT was the command-line option. Return FALSE to get
132 the default message in opts.c, TRUE if we provide a specialized
135 c_common_missing_argument (const char *opt, size_t code)
140 /* Pick up the default message. */
143 case OPT_fconstant_string_class_:
144 error ("no class name specified with %qs", opt);
148 error ("assertion missing after %qs", opt);
153 error ("macro name missing after %qs", opt);
162 error ("missing path after %qs", opt);
171 error ("missing filename after %qs", opt);
176 error ("missing makefile target after %qs", opt);
183 /* Defer option CODE with argument ARG. */
185 defer_opt (enum opt_code code, const char *arg)
187 deferred_opts[deferred_count].code = code;
188 deferred_opts[deferred_count].arg = arg;
192 /* Common initialization before parsing options. */
194 c_common_init_options (unsigned int argc, const char **argv)
196 static const unsigned int lang_flags[] = {CL_C, CL_ObjC, CL_CXX, CL_ObjCXX};
197 unsigned int i, result;
199 /* This is conditionalized only because that is the way the front
200 ends used to do it. Maybe this should be unconditional? */
201 if (c_dialect_cxx ())
203 /* By default wrap lines at 80 characters. Is getenv
204 ("COLUMNS") preferable? */
205 diagnostic_line_cutoff (global_dc) = 80;
206 /* By default, emit location information once for every
207 diagnostic message. */
208 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
211 parse_in = cpp_create_reader (c_dialect_cxx () ? CLK_GNUCXX: CLK_GNUC89,
212 ident_hash, &line_table);
214 cpp_opts = cpp_get_options (parse_in);
215 cpp_opts->dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
216 cpp_opts->objc = c_dialect_objc ();
218 /* Reset to avoid warnings on internal definitions. We set it just
219 before passing on command-line options to cpplib. */
220 cpp_opts->warn_dollars = 0;
222 flag_const_strings = c_dialect_cxx ();
223 flag_exceptions = c_dialect_cxx ();
224 warn_pointer_arith = c_dialect_cxx ();
226 deferred_opts = XNEWVEC (struct deferred_opt, argc);
228 result = lang_flags[c_language];
230 if (c_language == clk_c)
232 /* If preprocessing assembly language, accept any of the C-family
233 front end options since the driver may pass them through. */
234 for (i = 1; i < argc; i++)
235 if (! strcmp (argv[i], "-lang-asm"))
237 result |= CL_C | CL_ObjC | CL_CXX | CL_ObjCXX;
245 /* Handle switch SCODE with argument ARG. VALUE is true, unless no-
246 form of an -f or -W option was given. Returns 0 if the switch was
247 invalid, a negative number to prevent language-independent
248 processing in toplev.c (a hack necessary for the short-term). */
250 c_common_handle_option (size_t scode, const char *arg, int value)
252 const struct cl_option *option = &cl_options[scode];
253 enum opt_code code = (enum opt_code) scode;
259 if (cl_options[code].flags & (CL_C | CL_CXX | CL_ObjC | CL_ObjCXX))
264 case OPT__output_pch_:
269 defer_opt (code, arg);
273 cpp_opts->discard_comments = 0;
277 cpp_opts->discard_comments = 0;
278 cpp_opts->discard_comments_in_macro_exp = 0;
282 defer_opt (code, arg);
286 flag_preprocess_only = 1;
290 cpp_opts->print_include_names = 1;
294 TARGET_OPTF (xstrdup (arg));
298 if (strcmp (arg, "-"))
299 add_path (xstrdup (arg), BRACKET, 0, true);
302 if (quote_chain_split)
303 error ("-I- specified twice");
304 quote_chain_split = true;
305 split_quote_chain ();
306 inform ("obsolete option -I- used, please use -iquote instead");
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;
352 case OPT_fworking_directory:
353 flag_working_directory = value;
357 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_dialect_cxx ())
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_dialect_cxx ())
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. */
404 cpp_opts->warn_comments = value;
407 case OPT_Wdeprecated:
408 cpp_opts->warn_deprecated = value;
411 case OPT_Wdiv_by_zero:
412 warn_div_by_zero = value;
415 case OPT_Wendif_labels:
416 cpp_opts->warn_endif_labels = value;
420 cpp_opts->warnings_are_errors = value;
421 global_dc->warning_as_error_requested = value;
424 case OPT_Werror_implicit_function_declaration:
425 mesg_implicit_function_declaration = 2;
433 set_Wformat (atoi (arg));
437 set_Wimplicit (value);
441 /* Silently ignore for now. */
444 case OPT_Winvalid_pch:
445 cpp_opts->warn_invalid_pch = value;
455 case OPT_Wmissing_include_dirs:
456 cpp_opts->warn_missing_include_dirs = value;
460 cpp_opts->warn_multichar = value;
463 case OPT_Wreturn_type:
464 warn_return_type = value;
467 case OPT_Wstrict_null_sentinel:
468 warn_strict_null_sentinel = value;
471 case OPT_Wsystem_headers:
472 cpp_opts->warn_system_headers = value;
475 case OPT_Wtraditional:
476 cpp_opts->warn_traditional = value;
480 cpp_opts->warn_trigraphs = value;
484 cpp_opts->warn_undef = value;
487 case OPT_Wunknown_pragmas:
488 /* Set to greater than 1, so that even unknown pragmas in
489 system headers will be warned about. */
490 warn_unknown_pragmas = value * 2;
493 case OPT_Wunused_macros:
494 warn_unused_macros = value;
497 case OPT_Wvariadic_macros:
498 warn_variadic_macros = value;
501 case OPT_Wwrite_strings:
502 if (!c_dialect_cxx ())
503 flag_const_strings = value;
505 warn_write_strings = value;
509 if (!c_dialect_cxx ())
510 set_std_c89 (false, true);
512 set_std_cxx98 (true);
519 case OPT_fcond_mismatch:
520 if (!c_dialect_cxx ())
522 flag_cond_mismatch = value;
527 case OPT_fall_virtual:
528 case OPT_falt_external_templates:
529 case OPT_fenum_int_equiv:
530 case OPT_fexternal_templates:
531 case OPT_fguiding_decls:
533 case OPT_fhuge_objects:
535 case OPT_fname_mangling_version_:
537 case OPT_fnonnull_objects:
539 case OPT_fstrict_prototype:
540 case OPT_fthis_is_variable:
541 case OPT_fvtable_thunks:
544 warning ("switch %qs is no longer supported", option->opt_text);
547 case OPT_faccess_control:
548 flag_access_control = value;
552 flag_no_asm = !value;
556 flag_no_builtin = !value;
563 disable_builtin_function (arg);
566 case OPT_fdollars_in_identifiers:
567 cpp_opts->dollars_in_ident = value;
570 case OPT_ffreestanding:
572 /* Fall through.... */
575 flag_no_builtin = !value;
576 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
577 if (!value && warn_main == 2)
581 case OPT_fshort_double:
582 flag_short_double = value;
585 case OPT_fshort_enums:
586 flag_short_enums = value;
589 case OPT_fshort_wchar:
590 flag_short_wchar = value;
593 case OPT_fsigned_bitfields:
594 flag_signed_bitfields = value;
597 case OPT_fsigned_char:
598 flag_signed_char = value;
601 case OPT_funsigned_bitfields:
602 flag_signed_bitfields = !value;
605 case OPT_funsigned_char:
606 flag_signed_char = !value;
610 flag_check_new = value;
613 case OPT_fconserve_space:
614 flag_conserve_space = value;
617 case OPT_fconst_strings:
618 flag_const_strings = value;
621 case OPT_fconstant_string_class_:
622 constant_string_class_name = arg;
625 case OPT_fdefault_inline:
626 flag_default_inline = value;
629 case OPT_felide_constructors:
630 flag_elide_constructors = value;
633 case OPT_fenforce_eh_specs:
634 flag_enforce_eh_specs = value;
637 case OPT_ffixed_form:
638 case OPT_ffixed_line_length_:
639 /* Fortran front end options ignored when preprocessing only. */
640 if (!flag_preprocess_only)
645 flag_new_for_scope = value;
648 case OPT_fgnu_keywords:
649 flag_no_gnu_keywords = !value;
652 case OPT_fgnu_runtime:
653 flag_next_runtime = !value;
656 case OPT_fhandle_exceptions:
657 warning ("-fhandle-exceptions has been renamed -fexceptions (and is now on by default)");
658 flag_exceptions = value;
661 case OPT_fimplement_inlines:
662 flag_implement_inlines = value;
665 case OPT_fimplicit_inline_templates:
666 flag_implicit_inline_templates = value;
669 case OPT_fimplicit_templates:
670 flag_implicit_templates = value;
673 case OPT_fms_extensions:
674 flag_ms_extensions = value;
677 case OPT_fnext_runtime:
678 flag_next_runtime = value;
681 case OPT_fnil_receivers:
682 flag_nil_receivers = value;
685 case OPT_fnonansi_builtins:
686 flag_no_nonansi_builtin = !value;
689 case OPT_fobjc_exceptions:
690 flag_objc_exceptions = value;
693 case OPT_fobjc_sjlj_exceptions:
694 flag_objc_sjlj_exceptions = value;
697 case OPT_foperator_names:
698 cpp_opts->operator_names = value;
701 case OPT_foptional_diags:
702 flag_optional_diags = value;
706 cpp_opts->restore_pch_deps = value;
709 case OPT_fpch_preprocess:
710 flag_pch_preprocess = value;
713 case OPT_fpermissive:
714 flag_permissive = value;
717 case OPT_fpreprocessed:
718 cpp_opts->preprocessed = value;
721 case OPT_freplace_objc_classes:
722 flag_replace_objc_classes = value;
726 flag_use_repository = value;
728 flag_implicit_templates = 0;
735 case OPT_fshow_column:
736 cpp_opts->show_column = value;
740 flag_detailed_statistics = value;
744 /* It is documented that we silently ignore silly values. */
745 if (value >= 1 && value <= 100)
746 cpp_opts->tabstop = value;
749 case OPT_fexec_charset_:
750 cpp_opts->narrow_charset = arg;
753 case OPT_fwide_exec_charset_:
754 cpp_opts->wide_charset = arg;
757 case OPT_finput_charset_:
758 cpp_opts->input_charset = arg;
761 case OPT_ftemplate_depth_:
762 max_tinst_depth = value;
765 case OPT_fuse_cxa_atexit:
766 flag_use_cxa_atexit = value;
769 case OPT_fvisibility_inlines_hidden:
770 visibility_options.inlines_hidden = value;
777 case OPT_fthreadsafe_statics:
778 flag_threadsafe_statics = value;
782 flag_zero_link = value;
786 flag_gen_declaration = 1;
790 add_path (xstrdup (arg), AFTER, 0, true);
795 defer_opt (code, arg);
803 add_path (xstrdup (arg), QUOTE, 0, true);
811 add_path (xstrdup (arg), SYSTEM, 0, true);
814 case OPT_iwithprefix:
815 add_prefixed_path (arg, SYSTEM);
818 case OPT_iwithprefixbefore:
819 add_prefixed_path (arg, BRACKET);
823 cpp_set_lang (parse_in, CLK_ASM);
824 cpp_opts->dollars_in_ident = false;
843 error ("output filename specified twice");
846 /* We need to handle the -pedantic switches here, rather than in
847 c_common_post_options, so that a subsequent -Wno-endif-labels
848 is not overridden. */
849 case OPT_pedantic_errors:
850 cpp_opts->pedantic_errors = 1;
853 cpp_opts->pedantic = 1;
854 cpp_opts->warn_endif_labels = 1;
857 case OPT_print_objc_runtime_info:
858 print_struct_values = 1;
866 case OPT_std_gnu__98:
867 set_std_cxx98 (code == OPT_std_c__98 /* ISO */);
871 case OPT_std_iso9899_1990:
872 case OPT_std_iso9899_199409:
873 set_std_c89 (code == OPT_std_iso9899_199409 /* c94 */, true /* ISO */);
877 set_std_c89 (false /* c94 */, false /* ISO */);
882 case OPT_std_iso9899_1999:
883 case OPT_std_iso9899_199x:
884 set_std_c99 (true /* ISO */);
889 set_std_c99 (false /* ISO */);
893 cpp_opts->trigraphs = 1;
896 case OPT_traditional_cpp:
897 cpp_opts->traditional = 1;
905 cpp_opts->inhibit_warnings = 1;
916 /* Post-switch processing. */
918 c_common_post_options (const char **pfilename)
920 struct cpp_callbacks *cb;
922 /* Canonicalize the input and output filenames. */
923 if (in_fnames == NULL)
925 in_fnames = XNEWVEC (const char *, 1);
928 else if (strcmp (in_fnames[0], "-") == 0)
931 if (out_fname == NULL || !strcmp (out_fname, "-"))
934 if (cpp_opts->deps.style == DEPS_NONE)
935 check_deps_environment_vars ();
937 handle_deferred_opts ();
939 sanitize_cpp_opts ();
941 register_include_chains (parse_in, sysroot, iprefix,
942 std_inc, std_cxx_inc && c_dialect_cxx (), verbose);
944 flag_inline_trees = 1;
946 /* Use tree inlining. */
949 if (flag_inline_functions)
950 flag_inline_trees = 2;
952 /* If we are given more than one input file, we must use
953 unit-at-a-time mode. */
954 if (num_in_fnames > 1)
955 flag_unit_at_a_time = 1;
957 /* Default to ObjC sjlj exception handling if NeXT runtime. */
958 if (flag_objc_sjlj_exceptions < 0)
959 flag_objc_sjlj_exceptions = flag_next_runtime;
960 if (flag_objc_exceptions && !flag_objc_sjlj_exceptions)
963 /* -Wextra implies -Wsign-compare and -Wmissing-field-initializers,
964 but not if explicitly overridden. */
965 if (warn_sign_compare == -1)
966 warn_sign_compare = extra_warnings;
967 if (warn_missing_field_initializers == -1)
968 warn_missing_field_initializers = extra_warnings;
970 /* Special format checking options don't work without -Wformat; warn if
972 if (warn_format_y2k && !warn_format)
973 warning ("-Wformat-y2k ignored without -Wformat");
974 if (warn_format_extra_args && !warn_format)
975 warning ("-Wformat-extra-args ignored without -Wformat");
976 if (warn_format_zero_length && !warn_format)
977 warning ("-Wformat-zero-length ignored without -Wformat");
978 if (warn_format_nonliteral && !warn_format)
979 warning ("-Wformat-nonliteral ignored without -Wformat");
980 if (warn_format_security && !warn_format)
981 warning ("-Wformat-security ignored without -Wformat");
982 if (warn_missing_format_attribute && !warn_format)
983 warning ("-Wmissing-format-attribute ignored without -Wformat");
985 /* C99 requires special handling of complex multiplication and division;
986 -ffast-math and -fcx-limited-range are handled in process_options. */
988 flag_complex_method = 2;
990 if (flag_preprocess_only)
992 /* Open the output now. We must do so even if flag_no_output is
993 on, because there may be other output than from the actual
994 preprocessing (e.g. from -dM). */
995 if (out_fname[0] == '\0')
998 out_stream = fopen (out_fname, "w");
1000 if (out_stream == NULL)
1002 fatal_error ("opening output file %s: %m", out_fname);
1006 if (num_in_fnames > 1)
1007 error ("too many filenames given. Type %s --help for usage",
1010 init_pp_output (out_stream);
1016 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1017 input_location = UNKNOWN_LOCATION;
1020 cb = cpp_get_callbacks (parse_in);
1021 cb->file_change = cb_file_change;
1022 cb->dir_change = cb_dir_change;
1023 cpp_post_options (parse_in);
1025 input_location = UNKNOWN_LOCATION;
1027 /* If an error has occurred in cpplib, note it so we fail
1029 errorcount += cpp_errors (parse_in);
1031 *pfilename = this_input_filename
1032 = cpp_read_main_file (parse_in, in_fnames[0]);
1033 /* Don't do any compilation or preprocessing if there is no input file. */
1034 if (this_input_filename == NULL)
1040 if (flag_working_directory
1041 && flag_preprocess_only && !flag_no_line_commands)
1042 pp_dir_change (parse_in, get_src_pwd ());
1044 return flag_preprocess_only;
1047 /* Front end initialization common to C, ObjC and C++. */
1049 c_common_init (void)
1051 /* Set up preprocessor arithmetic. Must be done after call to
1052 c_common_nodes_and_builtins for type nodes to be good. */
1053 cpp_opts->precision = TYPE_PRECISION (intmax_type_node);
1054 cpp_opts->char_precision = TYPE_PRECISION (char_type_node);
1055 cpp_opts->int_precision = TYPE_PRECISION (integer_type_node);
1056 cpp_opts->wchar_precision = TYPE_PRECISION (wchar_type_node);
1057 cpp_opts->unsigned_wchar = TYPE_UNSIGNED (wchar_type_node);
1058 cpp_opts->bytes_big_endian = BYTES_BIG_ENDIAN;
1060 /* This can't happen until after wchar_precision and bytes_big_endian
1062 cpp_init_iconv (parse_in);
1064 if (flag_preprocess_only)
1067 preprocess_file (parse_in);
1071 /* Has to wait until now so that cpplib has its hash table. */
1077 /* Initialize the integrated preprocessor after debug output has been
1078 initialized; loop over each input file. */
1080 c_common_parse_file (int set_yydebug)
1084 /* Enable parser debugging, if requested and we can. If requested
1085 and we can't, notify the user. */
1087 yydebug = set_yydebug;
1090 warning ("YYDEBUG was not defined at build time, -dy ignored");
1096 /* Start the main input file, if the debug writer wants it. */
1097 if (debug_hooks->start_end_main_source_file)
1098 (*debug_hooks->start_source_file) (0, this_input_filename);
1105 /* And end the main input file, if the debug writer wants it */
1106 if (debug_hooks->start_end_main_source_file)
1107 (*debug_hooks->end_source_file) (0);
1108 if (++i >= num_in_fnames)
1110 cpp_undef_all (parse_in);
1112 = cpp_read_main_file (parse_in, in_fnames[i]);
1113 /* If an input file is missing, abandon further compilation.
1114 cpplib has issued a diagnostic. */
1115 if (!this_input_filename)
1120 /* Common finish hook for the C, ObjC and C++ front ends. */
1122 c_common_finish (void)
1124 FILE *deps_stream = NULL;
1126 if (cpp_opts->deps.style != DEPS_NONE)
1128 /* If -M or -MM was seen without -MF, default output to the
1131 deps_stream = out_stream;
1134 deps_stream = fopen (deps_file, deps_append ? "a": "w");
1136 fatal_error ("opening dependency file %s: %m", deps_file);
1140 /* For performance, avoid tearing down cpplib's internal structures
1141 with cpp_destroy (). */
1142 errorcount += cpp_finish (parse_in, deps_stream);
1144 if (deps_stream && deps_stream != out_stream
1145 && (ferror (deps_stream) || fclose (deps_stream)))
1146 fatal_error ("closing dependency file %s: %m", deps_file);
1148 if (out_stream && (ferror (out_stream) || fclose (out_stream)))
1149 fatal_error ("when writing output to %s: %m", out_fname);
1152 /* Either of two environment variables can specify output of
1153 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1154 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1155 and DEPS_TARGET is the target to mention in the deps. They also
1156 result in dependency information being appended to the output file
1157 rather than overwriting it, and like Sun's compiler
1158 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1160 check_deps_environment_vars (void)
1164 GET_ENVIRONMENT (spec, "DEPENDENCIES_OUTPUT");
1166 cpp_opts->deps.style = DEPS_USER;
1169 GET_ENVIRONMENT (spec, "SUNPRO_DEPENDENCIES");
1172 cpp_opts->deps.style = DEPS_SYSTEM;
1173 cpp_opts->deps.ignore_main_file = true;
1179 /* Find the space before the DEPS_TARGET, if there is one. */
1180 char *s = strchr (spec, ' ');
1183 /* Let the caller perform MAKE quoting. */
1184 defer_opt (OPT_MT, s + 1);
1188 /* Command line -MF overrides environment variables and default. */
1197 /* Handle deferred command line switches. */
1199 handle_deferred_opts (void)
1204 /* Avoid allocating the deps buffer if we don't need it.
1205 (This flag may be true without there having been -MT or -MQ
1206 options, but we'll still need the deps buffer.) */
1210 deps = cpp_get_deps (parse_in);
1212 for (i = 0; i < deferred_count; i++)
1214 struct deferred_opt *opt = &deferred_opts[i];
1216 if (opt->code == OPT_MT || opt->code == OPT_MQ)
1217 deps_add_target (deps, opt->arg, opt->code == OPT_MQ);
1221 /* These settings are appropriate for GCC, but not necessarily so for
1222 cpplib as a library. */
1224 sanitize_cpp_opts (void)
1226 /* If we don't know what style of dependencies to output, complain
1227 if any other dependency switches have been given. */
1228 if (deps_seen && cpp_opts->deps.style == DEPS_NONE)
1229 error ("to generate dependencies you must specify either -M or -MM");
1231 /* -dM and dependencies suppress normal output; do it here so that
1232 the last -d[MDN] switch overrides earlier ones. */
1233 if (flag_dump_macros == 'M')
1236 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1237 -dM since at least glibc relies on -M -dM to work. */
1238 /* Also, flag_no_output implies flag_no_line_commands, always. */
1241 if (flag_dump_macros != 'M')
1242 flag_dump_macros = 0;
1243 flag_dump_includes = 0;
1244 flag_no_line_commands = 1;
1247 cpp_opts->unsigned_char = !flag_signed_char;
1248 cpp_opts->stdc_0_in_system_headers = STDC_0_IN_SYSTEM_HEADERS;
1250 /* We want -Wno-long-long to override -pedantic -std=non-c99
1251 and/or -Wtraditional, whatever the ordering. */
1252 cpp_opts->warn_long_long
1253 = warn_long_long && ((!flag_isoc99 && pedantic) || warn_traditional);
1255 /* Similarly with -Wno-variadic-macros. No check for c99 here, since
1256 this also turns off warnings about GCCs extension. */
1257 cpp_opts->warn_variadic_macros
1258 = warn_variadic_macros && (pedantic || warn_traditional);
1260 /* If we're generating preprocessor output, emit current directory
1261 if explicitly requested or if debugging information is enabled.
1262 ??? Maybe we should only do it for debugging formats that
1263 actually output the current directory? */
1264 if (flag_working_directory == -1)
1265 flag_working_directory = (debug_info_level != DINFO_LEVEL_NONE);
1268 /* Add include path with a prefix at the front of its name. */
1270 add_prefixed_path (const char *suffix, size_t chain)
1274 size_t prefix_len, suffix_len;
1276 suffix_len = strlen (suffix);
1277 prefix = iprefix ? iprefix : cpp_GCC_INCLUDE_DIR;
1278 prefix_len = iprefix ? strlen (iprefix) : cpp_GCC_INCLUDE_DIR_len;
1280 path = (char *) xmalloc (prefix_len + suffix_len + 1);
1281 memcpy (path, prefix, prefix_len);
1282 memcpy (path + prefix_len, suffix, suffix_len);
1283 path[prefix_len + suffix_len] = '\0';
1285 add_path (path, chain, 0, false);
1288 /* Handle -D, -U, -A, -imacros, and the first -include. */
1290 finish_options (void)
1292 if (!cpp_opts->preprocessed)
1296 cpp_change_file (parse_in, LC_RENAME, _("<built-in>"));
1297 cpp_init_builtins (parse_in, flag_hosted);
1298 c_cpp_builtins (parse_in);
1300 /* We're about to send user input to cpplib, so make it warn for
1301 things that we previously (when we sent it internal definitions)
1302 told it to not warn.
1304 C99 permits implementation-defined characters in identifiers.
1305 The documented meaning of -std= is to turn off extensions that
1306 conflict with the specified standard, and since a strictly
1307 conforming program cannot contain a '$', we do not condition
1308 their acceptance on the -std= setting. */
1309 cpp_opts->warn_dollars = (cpp_opts->pedantic && !cpp_opts->c99);
1311 cpp_change_file (parse_in, LC_RENAME, _("<command line>"));
1312 for (i = 0; i < deferred_count; i++)
1314 struct deferred_opt *opt = &deferred_opts[i];
1316 if (opt->code == OPT_D)
1317 cpp_define (parse_in, opt->arg);
1318 else if (opt->code == OPT_U)
1319 cpp_undef (parse_in, opt->arg);
1320 else if (opt->code == OPT_A)
1322 if (opt->arg[0] == '-')
1323 cpp_unassert (parse_in, opt->arg + 1);
1325 cpp_assert (parse_in, opt->arg);
1329 /* Handle -imacros after -D and -U. */
1330 for (i = 0; i < deferred_count; i++)
1332 struct deferred_opt *opt = &deferred_opts[i];
1334 if (opt->code == OPT_imacros
1335 && cpp_push_include (parse_in, opt->arg))
1337 /* Disable push_command_line_include callback for now. */
1338 include_cursor = deferred_count + 1;
1339 cpp_scan_nooutput (parse_in);
1345 push_command_line_include ();
1348 /* Give CPP the next file given by -include, if any. */
1350 push_command_line_include (void)
1352 while (include_cursor < deferred_count)
1354 struct deferred_opt *opt = &deferred_opts[include_cursor++];
1356 if (!cpp_opts->preprocessed && opt->code == OPT_include
1357 && cpp_push_include (parse_in, opt->arg))
1361 if (include_cursor == deferred_count)
1364 /* -Wunused-macros should only warn about macros defined hereafter. */
1365 cpp_opts->warn_unused_macros = warn_unused_macros;
1366 /* Restore the line map from <command line>. */
1367 if (!cpp_opts->preprocessed)
1368 cpp_change_file (parse_in, LC_RENAME, this_input_filename);
1370 /* Set this here so the client can change the option if it wishes,
1371 and after stacking the main file so we don't trace the main file. */
1372 line_table.trace_includes = cpp_opts->print_include_names;
1376 /* File change callback. Has to handle -include files. */
1378 cb_file_change (cpp_reader * ARG_UNUSED (pfile),
1379 const struct line_map *new_map)
1381 if (flag_preprocess_only)
1382 pp_file_change (new_map);
1384 fe_file_change (new_map);
1386 if (new_map == 0 || (new_map->reason == LC_LEAVE && MAIN_FILE_P (new_map)))
1387 push_command_line_include ();
1391 cb_dir_change (cpp_reader * ARG_UNUSED (pfile), const char *dir)
1393 if (!set_src_pwd (dir))
1394 warning ("too late for # directive to set debug directory");
1397 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1398 extensions if ISO). There is no concept of gnu94. */
1400 set_std_c89 (int c94, int iso)
1402 cpp_set_lang (parse_in, c94 ? CLK_STDC94: iso ? CLK_STDC89: CLK_GNUC89);
1405 flag_no_gnu_keywords = iso;
1406 flag_no_nonansi_builtin = iso;
1411 /* Set the C 99 standard (without GNU extensions if ISO). */
1413 set_std_c99 (int iso)
1415 cpp_set_lang (parse_in, iso ? CLK_STDC99: CLK_GNUC99);
1417 flag_no_nonansi_builtin = iso;
1423 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1425 set_std_cxx98 (int iso)
1427 cpp_set_lang (parse_in, iso ? CLK_CXX98: CLK_GNUCXX);
1428 flag_no_gnu_keywords = iso;
1429 flag_no_nonansi_builtin = iso;
1433 /* Handle setting implicit to ON. */
1435 set_Wimplicit (int on)
1438 warn_implicit_int = on;
1441 if (mesg_implicit_function_declaration != 2)
1442 mesg_implicit_function_declaration = 1;
1445 mesg_implicit_function_declaration = 0;
1448 /* Args to -d specify what to dump. Silently ignore
1449 unrecognized options; they may be aimed at toplev.c. */
1451 handle_OPT_d (const char *arg)
1455 while ((c = *arg++) != '\0')
1458 case 'M': /* Dump macros only. */
1459 case 'N': /* Dump names. */
1460 case 'D': /* Dump definitions. */
1461 flag_dump_macros = c;
1465 flag_dump_includes = 1;