1 /* C/ObjC/C++ command line option handling.
2 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007
3 Free Software Foundation, Inc.
4 Contributed by Neil Booth.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 2, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING. If not, write to the Free
20 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
25 #include "coretypes.h"
32 #include "langhooks.h"
33 #include "tree-inline.h"
34 #include "diagnostic.h"
36 #include "cppdefault.h"
37 #include "c-incpath.h"
38 #include "debug.h" /* For debug_hooks. */
43 #ifndef DOLLARS_IN_IDENTIFIERS
44 # define DOLLARS_IN_IDENTIFIERS true
47 #ifndef TARGET_SYSTEM_ROOT
48 # define TARGET_SYSTEM_ROOT NULL
52 #define TARGET_OPTF(ARG)
56 static cpp_options *cpp_opts;
59 static const char *this_input_filename;
61 /* Filename and stream for preprocessed output. */
62 static const char *out_fname;
63 static FILE *out_stream;
65 /* Append dependencies to deps_file. */
66 static bool deps_append;
68 /* If dependency switches (-MF etc.) have been given. */
69 static bool deps_seen;
74 /* If -lang-fortran seen. */
75 static bool lang_fortran = false;
77 /* Dependency output file. */
78 static const char *deps_file;
80 /* The prefix given by -iprefix, if any. */
81 static const char *iprefix;
83 /* The multilib directory given by -imultilib, if any. */
84 static const char *imultilib;
86 /* The system root, if any. Overridden by -isysroot. */
87 static const char *sysroot = TARGET_SYSTEM_ROOT;
89 /* Zero disables all standard directories for headers. */
90 static bool std_inc = true;
92 /* Zero disables the C++-specific standard directories for headers. */
93 static bool std_cxx_inc = true;
95 /* If the quote chain has been split by -I-. */
96 static bool quote_chain_split;
98 /* If -Wunused-macros. */
99 static bool warn_unused_macros;
101 /* If -Wvariadic-macros. */
102 static bool warn_variadic_macros = true;
104 /* Number of deferred options. */
105 static size_t deferred_count;
107 /* Number of deferred options scanned for -include. */
108 static size_t include_cursor;
110 static void set_Wimplicit (int);
111 static void handle_OPT_d (const char *);
112 static void set_std_cxx98 (int);
113 static void set_std_cxx0x (int);
114 static void set_std_c89 (int, int);
115 static void set_std_c99 (int);
116 static void check_deps_environment_vars (void);
117 static void handle_deferred_opts (void);
118 static void sanitize_cpp_opts (void);
119 static void add_prefixed_path (const char *, size_t);
120 static void push_command_line_include (void);
121 static void cb_file_change (cpp_reader *, const struct line_map *);
122 static void cb_dir_change (cpp_reader *, const char *);
123 static void finish_options (void);
125 #ifndef STDC_0_IN_SYSTEM_HEADERS
126 #define STDC_0_IN_SYSTEM_HEADERS 0
129 /* Holds switches parsed by c_common_handle_option (), but whose
130 handling is deferred to c_common_post_options (). */
131 static void defer_opt (enum opt_code, const char *);
132 static struct deferred_opt
138 /* Complain that switch CODE expects an argument but none was
139 provided. OPT was the command-line option. Return FALSE to get
140 the default message in opts.c, TRUE if we provide a specialized
143 c_common_missing_argument (const char *opt, size_t code)
148 /* Pick up the default message. */
151 case OPT_fconstant_string_class_:
152 error ("no class name specified with %qs", opt);
156 error ("assertion missing after %qs", opt);
161 error ("macro name missing after %qs", opt);
170 error ("missing path after %qs", opt);
179 error ("missing filename after %qs", opt);
184 error ("missing makefile target after %qs", opt);
191 /* Defer option CODE with argument ARG. */
193 defer_opt (enum opt_code code, const char *arg)
195 deferred_opts[deferred_count].code = code;
196 deferred_opts[deferred_count].arg = arg;
200 /* Common initialization before parsing options. */
202 c_common_init_options (unsigned int argc, const char **argv)
204 static const unsigned int lang_flags[] = {CL_C, CL_ObjC, CL_CXX, CL_ObjCXX};
205 unsigned int i, result;
207 /* This is conditionalized only because that is the way the front
208 ends used to do it. Maybe this should be unconditional? */
209 if (c_dialect_cxx ())
211 /* By default wrap lines at 80 characters. Is getenv
212 ("COLUMNS") preferable? */
213 diagnostic_line_cutoff (global_dc) = 80;
214 /* By default, emit location information once for every
215 diagnostic message. */
216 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
219 parse_in = cpp_create_reader (c_dialect_cxx () ? CLK_GNUCXX: CLK_GNUC89,
220 ident_hash, &line_table);
222 cpp_opts = cpp_get_options (parse_in);
223 cpp_opts->dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
224 cpp_opts->objc = c_dialect_objc ();
226 /* Reset to avoid warnings on internal definitions. We set it just
227 before passing on command-line options to cpplib. */
228 cpp_opts->warn_dollars = 0;
230 flag_exceptions = c_dialect_cxx ();
231 warn_pointer_arith = c_dialect_cxx ();
232 warn_write_strings = c_dialect_cxx();
234 deferred_opts = XNEWVEC (struct deferred_opt, argc);
236 result = lang_flags[c_language];
238 if (c_language == clk_c)
240 /* If preprocessing assembly language, accept any of the C-family
241 front end options since the driver may pass them through. */
242 for (i = 1; i < argc; i++)
243 if (! strcmp (argv[i], "-lang-asm"))
245 result |= CL_C | CL_ObjC | CL_CXX | CL_ObjCXX;
250 for (i = 1; i < argc; i++)
251 if (! strcmp (argv[i], "-lang-fortran"))
253 result |= CL_Fortran;
262 /* Handle switch SCODE with argument ARG. VALUE is true, unless no-
263 form of an -f or -W option was given. Returns 0 if the switch was
264 invalid, a negative number to prevent language-independent
265 processing in toplev.c (a hack necessary for the short-term). */
267 c_common_handle_option (size_t scode, const char *arg, int value)
269 const struct cl_option *option = &cl_options[scode];
270 enum opt_code code = (enum opt_code) scode;
273 /* Prevent resetting the language standard to a C dialect when the driver
274 has already determined that we're looking at assembler input. */
275 bool preprocessing_asm_p = (cpp_get_options (parse_in)->lang == CLK_ASM);
280 if (cl_options[code].flags & (CL_C | CL_CXX | CL_ObjC | CL_ObjCXX))
283 if (lang_fortran && (cl_options[code].flags & (CL_Fortran)))
289 case OPT__output_pch_:
294 defer_opt (code, arg);
298 cpp_opts->discard_comments = 0;
302 cpp_opts->discard_comments = 0;
303 cpp_opts->discard_comments_in_macro_exp = 0;
307 defer_opt (code, arg);
311 flag_preprocess_only = 1;
315 cpp_opts->print_include_names = 1;
319 TARGET_OPTF (xstrdup (arg));
323 if (strcmp (arg, "-"))
324 add_path (xstrdup (arg), BRACKET, 0, true);
327 if (quote_chain_split)
328 error ("-I- specified twice");
329 quote_chain_split = true;
330 split_quote_chain ();
331 inform ("obsolete option -I- used, please use -iquote instead");
337 /* When doing dependencies with -M or -MM, suppress normal
338 preprocessed output, but still do -dM etc. as software
339 depends on this. Preprocessed output does occur if -MD, -MMD
340 or environment var dependency generation is used. */
341 cpp_opts->deps.style = (code == OPT_M ? DEPS_SYSTEM: DEPS_USER);
343 cpp_opts->inhibit_warnings = 1;
348 cpp_opts->deps.style = (code == OPT_MD ? DEPS_SYSTEM: DEPS_USER);
359 cpp_opts->deps.missing_files = true;
364 cpp_opts->deps.phony_targets = true;
370 defer_opt (code, arg);
374 flag_no_line_commands = 1;
377 case OPT_fworking_directory:
378 flag_working_directory = value;
382 defer_opt (code, arg);
388 set_Wimplicit (value);
389 warn_char_subscripts = value;
390 warn_missing_braces = value;
391 warn_parentheses = value;
392 warn_return_type = value;
393 warn_sequence_point = value; /* Was C only. */
394 if (c_dialect_cxx ())
395 warn_sign_compare = value;
397 warn_strict_aliasing = value;
398 warn_strict_overflow = value;
399 warn_string_literal_comparison = value;
400 warn_always_true = value;
401 warn_array_bounds = value;
403 /* Only warn about unknown pragmas that are not in system
405 warn_unknown_pragmas = value;
407 /* We save the value of warn_uninitialized, since if they put
408 -Wuninitialized on the command line, we need to generate a
409 warning about not using it without also specifying -O. */
410 if (warn_uninitialized != 1)
411 warn_uninitialized = (value ? 2 : 0);
413 if (!c_dialect_cxx ())
414 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding
415 can turn it off only if it's not explicit. */
416 warn_main = value * 2;
419 /* C++-specific warnings. */
420 warn_reorder = value;
421 warn_nontemplate_friend = value;
422 warn_cxx0x_compat = value;
424 warn_write_strings = true;
427 cpp_opts->warn_trigraphs = value;
428 cpp_opts->warn_comments = value;
429 cpp_opts->warn_num_sign_change = value;
430 cpp_opts->warn_multichar = value; /* Was C++ only. */
432 if (warn_pointer_sign == -1)
433 warn_pointer_sign = 1;
438 cpp_opts->warn_comments = value;
441 case OPT_Wdeprecated:
442 cpp_opts->warn_deprecated = value;
445 case OPT_Wendif_labels:
446 cpp_opts->warn_endif_labels = value;
450 cpp_opts->warnings_are_errors = value;
451 global_dc->warning_as_error_requested = value;
454 case OPT_Werror_implicit_function_declaration:
455 /* For backward compatibility, this is the same as
456 -Werror=implicit-function-declaration. */
457 enable_warning_as_error ("implicit-function-declaration", value, CL_C | CL_ObjC);
465 set_Wformat (atoi (arg));
469 set_Wimplicit (value);
473 /* Silently ignore for now. */
476 case OPT_Winvalid_pch:
477 cpp_opts->warn_invalid_pch = value;
487 case OPT_Wmissing_include_dirs:
488 cpp_opts->warn_missing_include_dirs = value;
492 cpp_opts->warn_multichar = value;
495 case OPT_Wnormalized_:
496 if (!value || (arg && strcasecmp (arg, "none") == 0))
497 cpp_opts->warn_normalize = normalized_none;
498 else if (!arg || strcasecmp (arg, "nfkc") == 0)
499 cpp_opts->warn_normalize = normalized_KC;
500 else if (strcasecmp (arg, "id") == 0)
501 cpp_opts->warn_normalize = normalized_identifier_C;
502 else if (strcasecmp (arg, "nfc") == 0)
503 cpp_opts->warn_normalize = normalized_C;
505 error ("argument %qs to %<-Wnormalized%> not recognized", arg);
508 case OPT_Wreturn_type:
509 warn_return_type = value;
512 case OPT_Wstrict_null_sentinel:
513 warn_strict_null_sentinel = value;
516 case OPT_Wsystem_headers:
517 cpp_opts->warn_system_headers = value;
520 case OPT_Wtraditional:
521 cpp_opts->warn_traditional = value;
525 cpp_opts->warn_trigraphs = value;
529 cpp_opts->warn_undef = value;
532 case OPT_Wunknown_pragmas:
533 /* Set to greater than 1, so that even unknown pragmas in
534 system headers will be warned about. */
535 warn_unknown_pragmas = value * 2;
538 case OPT_Wunused_macros:
539 warn_unused_macros = value;
542 case OPT_Wvariadic_macros:
543 warn_variadic_macros = value;
546 case OPT_Wwrite_strings:
547 warn_write_strings = value;
553 warn_nonvdtor = true;
557 if (!c_dialect_cxx ())
558 set_std_c89 (false, true);
560 set_std_cxx98 (true);
567 case OPT_fcond_mismatch:
568 if (!c_dialect_cxx ())
570 flag_cond_mismatch = value;
575 case OPT_fall_virtual:
576 case OPT_falt_external_templates:
577 case OPT_fenum_int_equiv:
578 case OPT_fexternal_templates:
579 case OPT_fguiding_decls:
581 case OPT_fhuge_objects:
583 case OPT_fname_mangling_version_:
585 case OPT_fnonnull_objects:
587 case OPT_fstrict_prototype:
588 case OPT_fthis_is_variable:
589 case OPT_fvtable_thunks:
592 warning (0, "switch %qs is no longer supported", option->opt_text);
595 case OPT_faccess_control:
596 flag_access_control = value;
600 flag_no_asm = !value;
604 flag_no_builtin = !value;
611 disable_builtin_function (arg);
614 case OPT_fdollars_in_identifiers:
615 cpp_opts->dollars_in_ident = value;
618 case OPT_ffreestanding:
620 /* Fall through.... */
623 flag_no_builtin = !value;
624 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
625 if (!value && warn_main == 2)
629 case OPT_fshort_double:
630 flag_short_double = value;
633 case OPT_fshort_enums:
634 flag_short_enums = value;
637 case OPT_fshort_wchar:
638 flag_short_wchar = value;
641 case OPT_fsigned_bitfields:
642 flag_signed_bitfields = value;
645 case OPT_fsigned_char:
646 flag_signed_char = value;
649 case OPT_funsigned_bitfields:
650 flag_signed_bitfields = !value;
653 case OPT_funsigned_char:
654 flag_signed_char = !value;
658 flag_check_new = value;
661 case OPT_fconserve_space:
662 flag_conserve_space = value;
665 case OPT_fconstant_string_class_:
666 constant_string_class_name = arg;
669 case OPT_fdefault_inline:
670 flag_default_inline = value;
673 case OPT_felide_constructors:
674 flag_elide_constructors = value;
677 case OPT_fenforce_eh_specs:
678 flag_enforce_eh_specs = value;
681 case OPT_fextended_identifiers:
682 cpp_opts->extended_identifiers = value;
686 flag_new_for_scope = value;
689 case OPT_fgnu_keywords:
690 flag_no_gnu_keywords = !value;
693 case OPT_fgnu_runtime:
694 flag_next_runtime = !value;
697 case OPT_fhandle_exceptions:
698 warning (0, "-fhandle-exceptions has been renamed -fexceptions (and is now on by default)");
699 flag_exceptions = value;
702 case OPT_fimplement_inlines:
703 flag_implement_inlines = value;
706 case OPT_fimplicit_inline_templates:
707 flag_implicit_inline_templates = value;
710 case OPT_fimplicit_templates:
711 flag_implicit_templates = value;
714 case OPT_flax_vector_conversions:
715 flag_lax_vector_conversions = value;
718 case OPT_fms_extensions:
719 flag_ms_extensions = value;
722 case OPT_fnext_runtime:
723 flag_next_runtime = value;
726 case OPT_fnil_receivers:
727 flag_nil_receivers = value;
730 case OPT_fnonansi_builtins:
731 flag_no_nonansi_builtin = !value;
734 case OPT_foperator_names:
735 cpp_opts->operator_names = value;
738 case OPT_foptional_diags:
739 flag_optional_diags = value;
743 cpp_opts->restore_pch_deps = value;
746 case OPT_fpch_preprocess:
747 flag_pch_preprocess = value;
750 case OPT_fpermissive:
751 flag_permissive = value;
754 case OPT_fpreprocessed:
755 cpp_opts->preprocessed = value;
758 case OPT_freplace_objc_classes:
759 flag_replace_objc_classes = value;
763 flag_use_repository = value;
765 flag_implicit_templates = 0;
772 case OPT_fshow_column:
773 cpp_opts->show_column = value;
777 flag_detailed_statistics = value;
781 /* It is documented that we silently ignore silly values. */
782 if (value >= 1 && value <= 100)
783 cpp_opts->tabstop = value;
786 case OPT_fexec_charset_:
787 cpp_opts->narrow_charset = arg;
790 case OPT_fwide_exec_charset_:
791 cpp_opts->wide_charset = arg;
794 case OPT_finput_charset_:
795 cpp_opts->input_charset = arg;
798 case OPT_ftemplate_depth_:
799 max_tinst_depth = value;
802 case OPT_fuse_cxa_atexit:
803 flag_use_cxa_atexit = value;
806 case OPT_fuse_cxa_get_exception_ptr:
807 flag_use_cxa_get_exception_ptr = value;
810 case OPT_fvisibility_inlines_hidden:
811 visibility_options.inlines_hidden = value;
818 case OPT_fthreadsafe_statics:
819 flag_threadsafe_statics = value;
823 flag_zero_link = value;
827 flag_gen_declaration = 1;
831 add_path (xstrdup (arg), AFTER, 0, true);
836 defer_opt (code, arg);
848 add_path (xstrdup (arg), QUOTE, 0, true);
856 add_path (xstrdup (arg), SYSTEM, 0, true);
859 case OPT_iwithprefix:
860 add_prefixed_path (arg, SYSTEM);
863 case OPT_iwithprefixbefore:
864 add_prefixed_path (arg, BRACKET);
868 cpp_set_lang (parse_in, CLK_ASM);
869 cpp_opts->dollars_in_ident = false;
872 case OPT_lang_fortran:
892 error ("output filename specified twice");
895 /* We need to handle the -pedantic switches here, rather than in
896 c_common_post_options, so that a subsequent -Wno-endif-labels
897 is not overridden. */
898 case OPT_pedantic_errors:
899 cpp_opts->pedantic_errors = 1;
902 cpp_opts->pedantic = 1;
903 cpp_opts->warn_endif_labels = 1;
904 if (warn_pointer_sign == -1)
905 warn_pointer_sign = 1;
906 if (warn_overlength_strings == -1)
907 warn_overlength_strings = 1;
910 case OPT_print_objc_runtime_info:
911 print_struct_values = 1;
914 case OPT_print_pch_checksum:
915 c_common_print_pch_checksum (stdout);
916 exit_after_options = true;
924 case OPT_std_gnu__98:
925 if (!preprocessing_asm_p)
926 set_std_cxx98 (code == OPT_std_c__98 /* ISO */);
930 case OPT_std_gnu__0x:
931 if (!preprocessing_asm_p)
932 set_std_cxx0x (code == OPT_std_c__0x /* ISO */);
936 case OPT_std_iso9899_1990:
937 case OPT_std_iso9899_199409:
938 if (!preprocessing_asm_p)
939 set_std_c89 (code == OPT_std_iso9899_199409 /* c94 */, true /* ISO */);
943 if (!preprocessing_asm_p)
944 set_std_c89 (false /* c94 */, false /* ISO */);
949 case OPT_std_iso9899_1999:
950 case OPT_std_iso9899_199x:
951 if (!preprocessing_asm_p)
952 set_std_c99 (true /* ISO */);
957 if (!preprocessing_asm_p)
958 set_std_c99 (false /* ISO */);
962 cpp_opts->trigraphs = 1;
965 case OPT_traditional_cpp:
966 cpp_opts->traditional = 1;
974 cpp_opts->inhibit_warnings = 1;
985 /* Post-switch processing. */
987 c_common_post_options (const char **pfilename)
989 struct cpp_callbacks *cb;
991 /* Canonicalize the input and output filenames. */
992 if (in_fnames == NULL)
994 in_fnames = XNEWVEC (const char *, 1);
997 else if (strcmp (in_fnames[0], "-") == 0)
1000 if (out_fname == NULL || !strcmp (out_fname, "-"))
1003 if (cpp_opts->deps.style == DEPS_NONE)
1004 check_deps_environment_vars ();
1006 handle_deferred_opts ();
1008 sanitize_cpp_opts ();
1010 register_include_chains (parse_in, sysroot, iprefix, imultilib,
1011 std_inc, std_cxx_inc && c_dialect_cxx (), verbose);
1013 #ifdef C_COMMON_OVERRIDE_OPTIONS
1014 /* Some machines may reject certain combinations of C
1015 language-specific options. */
1016 C_COMMON_OVERRIDE_OPTIONS;
1019 flag_inline_trees = 1;
1021 /* Use tree inlining. */
1022 if (!flag_no_inline)
1024 if (flag_inline_functions)
1025 flag_inline_trees = 2;
1027 /* If we are given more than one input file, we must use
1028 unit-at-a-time mode. */
1029 if (num_in_fnames > 1)
1030 flag_unit_at_a_time = 1;
1032 /* Default to ObjC sjlj exception handling if NeXT runtime. */
1033 if (flag_objc_sjlj_exceptions < 0)
1034 flag_objc_sjlj_exceptions = flag_next_runtime;
1035 if (flag_objc_exceptions && !flag_objc_sjlj_exceptions)
1036 flag_exceptions = 1;
1038 /* -Wextra implies -Wclobbered, -Wempty-body, -Wsign-compare,
1039 -Wmissing-field-initializers, -Wmissing-parameter-type
1040 -Wold-style-declaration, and -Woverride-init,
1041 but not if explicitly overridden. */
1042 if (warn_clobbered == -1)
1043 warn_clobbered = extra_warnings;
1044 if (warn_empty_body == -1)
1045 warn_empty_body = extra_warnings;
1046 if (warn_sign_compare == -1)
1047 warn_sign_compare = extra_warnings;
1048 if (warn_missing_field_initializers == -1)
1049 warn_missing_field_initializers = extra_warnings;
1050 if (warn_missing_parameter_type == -1)
1051 warn_missing_parameter_type = extra_warnings;
1052 if (warn_old_style_declaration == -1)
1053 warn_old_style_declaration = extra_warnings;
1054 if (warn_override_init == -1)
1055 warn_override_init = extra_warnings;
1057 /* -Wpointer_sign is disabled by default, but it is enabled if any
1058 of -Wall or -pedantic are given. */
1059 if (warn_pointer_sign == -1)
1060 warn_pointer_sign = 0;
1062 /* -Woverlength-strings is off by default, but is enabled by -pedantic.
1063 It is never enabled in C++, as the minimum limit is not normative
1064 in that standard. */
1065 if (warn_overlength_strings == -1 || c_dialect_cxx ())
1066 warn_overlength_strings = 0;
1068 /* Special format checking options don't work without -Wformat; warn if
1072 warning (OPT_Wformat_y2k,
1073 "-Wformat-y2k ignored without -Wformat");
1074 warning (OPT_Wformat_extra_args,
1075 "-Wformat-extra-args ignored without -Wformat");
1076 warning (OPT_Wformat_zero_length,
1077 "-Wformat-zero-length ignored without -Wformat");
1078 warning (OPT_Wformat_nonliteral,
1079 "-Wformat-nonliteral ignored without -Wformat");
1080 warning (OPT_Wformat_security,
1081 "-Wformat-security ignored without -Wformat");
1084 /* -Wimplicit-function-declaration is enabled by default for C99. */
1085 if (warn_implicit_function_declaration == -1)
1086 warn_implicit_function_declaration = flag_isoc99;
1088 /* C99 requires special handling of complex multiplication and division;
1089 -ffast-math and -fcx-limited-range are handled in process_options. */
1091 flag_complex_method = 2;
1093 /* If we're allowing C++0x constructs, don't warn about C++0x
1094 compatibility problems. */
1096 warn_cxx0x_compat = 0;
1098 if (flag_preprocess_only)
1100 /* Open the output now. We must do so even if flag_no_output is
1101 on, because there may be other output than from the actual
1102 preprocessing (e.g. from -dM). */
1103 if (out_fname[0] == '\0')
1104 out_stream = stdout;
1106 out_stream = fopen (out_fname, "w");
1108 if (out_stream == NULL)
1110 fatal_error ("opening output file %s: %m", out_fname);
1114 if (num_in_fnames > 1)
1115 error ("too many filenames given. Type %s --help for usage",
1118 init_pp_output (out_stream);
1124 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1125 input_location = UNKNOWN_LOCATION;
1128 cb = cpp_get_callbacks (parse_in);
1129 cb->file_change = cb_file_change;
1130 cb->dir_change = cb_dir_change;
1131 cpp_post_options (parse_in);
1133 input_location = UNKNOWN_LOCATION;
1135 /* If an error has occurred in cpplib, note it so we fail
1137 errorcount += cpp_errors (parse_in);
1139 *pfilename = this_input_filename
1140 = cpp_read_main_file (parse_in, in_fnames[0]);
1141 /* Don't do any compilation or preprocessing if there is no input file. */
1142 if (this_input_filename == NULL)
1148 if (flag_working_directory
1149 && flag_preprocess_only && !flag_no_line_commands)
1150 pp_dir_change (parse_in, get_src_pwd ());
1152 return flag_preprocess_only;
1155 /* Front end initialization common to C, ObjC and C++. */
1157 c_common_init (void)
1159 /* Set up preprocessor arithmetic. Must be done after call to
1160 c_common_nodes_and_builtins for type nodes to be good. */
1161 cpp_opts->precision = TYPE_PRECISION (intmax_type_node);
1162 cpp_opts->char_precision = TYPE_PRECISION (char_type_node);
1163 cpp_opts->int_precision = TYPE_PRECISION (integer_type_node);
1164 cpp_opts->wchar_precision = TYPE_PRECISION (wchar_type_node);
1165 cpp_opts->unsigned_wchar = TYPE_UNSIGNED (wchar_type_node);
1166 cpp_opts->bytes_big_endian = BYTES_BIG_ENDIAN;
1168 /* This can't happen until after wchar_precision and bytes_big_endian
1170 cpp_init_iconv (parse_in);
1173 c_common_print_pch_checksum (stderr);
1175 if (flag_preprocess_only)
1178 preprocess_file (parse_in);
1182 /* Has to wait until now so that cpplib has its hash table. */
1188 /* Initialize the integrated preprocessor after debug output has been
1189 initialized; loop over each input file. */
1191 c_common_parse_file (int set_yydebug)
1199 warning(0, "The C parser does not support -dy, option ignored");
1203 "The Objective-C parser does not support -dy, option ignored");
1206 warning(0, "The C++ parser does not support -dy, option ignored");
1210 "The Objective-C++ parser does not support -dy, option ignored");
1219 /* Start the main input file, if the debug writer wants it. */
1220 if (debug_hooks->start_end_main_source_file)
1221 (*debug_hooks->start_source_file) (0, this_input_filename);
1228 /* And end the main input file, if the debug writer wants it */
1229 if (debug_hooks->start_end_main_source_file)
1230 (*debug_hooks->end_source_file) (0);
1231 if (++i >= num_in_fnames)
1233 cpp_undef_all (parse_in);
1235 = cpp_read_main_file (parse_in, in_fnames[i]);
1236 /* If an input file is missing, abandon further compilation.
1237 cpplib has issued a diagnostic. */
1238 if (!this_input_filename)
1243 /* Common finish hook for the C, ObjC and C++ front ends. */
1245 c_common_finish (void)
1247 FILE *deps_stream = NULL;
1249 if (cpp_opts->deps.style != DEPS_NONE)
1251 /* If -M or -MM was seen without -MF, default output to the
1254 deps_stream = out_stream;
1257 deps_stream = fopen (deps_file, deps_append ? "a": "w");
1259 fatal_error ("opening dependency file %s: %m", deps_file);
1263 /* For performance, avoid tearing down cpplib's internal structures
1264 with cpp_destroy (). */
1265 errorcount += cpp_finish (parse_in, deps_stream);
1267 if (deps_stream && deps_stream != out_stream
1268 && (ferror (deps_stream) || fclose (deps_stream)))
1269 fatal_error ("closing dependency file %s: %m", deps_file);
1271 if (out_stream && (ferror (out_stream) || fclose (out_stream)))
1272 fatal_error ("when writing output to %s: %m", out_fname);
1275 /* Either of two environment variables can specify output of
1276 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1277 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1278 and DEPS_TARGET is the target to mention in the deps. They also
1279 result in dependency information being appended to the output file
1280 rather than overwriting it, and like Sun's compiler
1281 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1283 check_deps_environment_vars (void)
1287 GET_ENVIRONMENT (spec, "DEPENDENCIES_OUTPUT");
1289 cpp_opts->deps.style = DEPS_USER;
1292 GET_ENVIRONMENT (spec, "SUNPRO_DEPENDENCIES");
1295 cpp_opts->deps.style = DEPS_SYSTEM;
1296 cpp_opts->deps.ignore_main_file = true;
1302 /* Find the space before the DEPS_TARGET, if there is one. */
1303 char *s = strchr (spec, ' ');
1306 /* Let the caller perform MAKE quoting. */
1307 defer_opt (OPT_MT, s + 1);
1311 /* Command line -MF overrides environment variables and default. */
1320 /* Handle deferred command line switches. */
1322 handle_deferred_opts (void)
1327 /* Avoid allocating the deps buffer if we don't need it.
1328 (This flag may be true without there having been -MT or -MQ
1329 options, but we'll still need the deps buffer.) */
1333 deps = cpp_get_deps (parse_in);
1335 for (i = 0; i < deferred_count; i++)
1337 struct deferred_opt *opt = &deferred_opts[i];
1339 if (opt->code == OPT_MT || opt->code == OPT_MQ)
1340 deps_add_target (deps, opt->arg, opt->code == OPT_MQ);
1344 /* These settings are appropriate for GCC, but not necessarily so for
1345 cpplib as a library. */
1347 sanitize_cpp_opts (void)
1349 /* If we don't know what style of dependencies to output, complain
1350 if any other dependency switches have been given. */
1351 if (deps_seen && cpp_opts->deps.style == DEPS_NONE)
1352 error ("to generate dependencies you must specify either -M or -MM");
1354 /* -dM and dependencies suppress normal output; do it here so that
1355 the last -d[MDN] switch overrides earlier ones. */
1356 if (flag_dump_macros == 'M')
1359 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1360 -dM since at least glibc relies on -M -dM to work. */
1361 /* Also, flag_no_output implies flag_no_line_commands, always. */
1364 if (flag_dump_macros != 'M')
1365 flag_dump_macros = 0;
1366 flag_dump_includes = 0;
1367 flag_no_line_commands = 1;
1370 cpp_opts->unsigned_char = !flag_signed_char;
1371 cpp_opts->stdc_0_in_system_headers = STDC_0_IN_SYSTEM_HEADERS;
1373 /* We want -Wno-long-long to override -pedantic -std=non-c99
1374 and/or -Wtraditional, whatever the ordering. */
1375 cpp_opts->warn_long_long
1376 = warn_long_long && ((!flag_isoc99 && pedantic) || warn_traditional);
1378 /* Similarly with -Wno-variadic-macros. No check for c99 here, since
1379 this also turns off warnings about GCCs extension. */
1380 cpp_opts->warn_variadic_macros
1381 = warn_variadic_macros && (pedantic || warn_traditional);
1383 /* If we're generating preprocessor output, emit current directory
1384 if explicitly requested or if debugging information is enabled.
1385 ??? Maybe we should only do it for debugging formats that
1386 actually output the current directory? */
1387 if (flag_working_directory == -1)
1388 flag_working_directory = (debug_info_level != DINFO_LEVEL_NONE);
1391 /* Add include path with a prefix at the front of its name. */
1393 add_prefixed_path (const char *suffix, size_t chain)
1397 size_t prefix_len, suffix_len;
1399 suffix_len = strlen (suffix);
1400 prefix = iprefix ? iprefix : cpp_GCC_INCLUDE_DIR;
1401 prefix_len = iprefix ? strlen (iprefix) : cpp_GCC_INCLUDE_DIR_len;
1403 path = (char *) xmalloc (prefix_len + suffix_len + 1);
1404 memcpy (path, prefix, prefix_len);
1405 memcpy (path + prefix_len, suffix, suffix_len);
1406 path[prefix_len + suffix_len] = '\0';
1408 add_path (path, chain, 0, false);
1411 /* Handle -D, -U, -A, -imacros, and the first -include. */
1413 finish_options (void)
1415 if (!cpp_opts->preprocessed)
1419 cb_file_change (parse_in,
1420 linemap_add (&line_table, LC_RENAME, 0,
1421 _("<built-in>"), 0));
1423 cpp_init_builtins (parse_in, flag_hosted);
1424 c_cpp_builtins (parse_in);
1426 /* We're about to send user input to cpplib, so make it warn for
1427 things that we previously (when we sent it internal definitions)
1428 told it to not warn.
1430 C99 permits implementation-defined characters in identifiers.
1431 The documented meaning of -std= is to turn off extensions that
1432 conflict with the specified standard, and since a strictly
1433 conforming program cannot contain a '$', we do not condition
1434 their acceptance on the -std= setting. */
1435 cpp_opts->warn_dollars = (cpp_opts->pedantic && !cpp_opts->c99);
1437 cb_file_change (parse_in,
1438 linemap_add (&line_table, LC_RENAME, 0,
1439 _("<command-line>"), 0));
1441 for (i = 0; i < deferred_count; i++)
1443 struct deferred_opt *opt = &deferred_opts[i];
1445 if (opt->code == OPT_D)
1446 cpp_define (parse_in, opt->arg);
1447 else if (opt->code == OPT_U)
1448 cpp_undef (parse_in, opt->arg);
1449 else if (opt->code == OPT_A)
1451 if (opt->arg[0] == '-')
1452 cpp_unassert (parse_in, opt->arg + 1);
1454 cpp_assert (parse_in, opt->arg);
1458 /* Handle -imacros after -D and -U. */
1459 for (i = 0; i < deferred_count; i++)
1461 struct deferred_opt *opt = &deferred_opts[i];
1463 if (opt->code == OPT_imacros
1464 && cpp_push_include (parse_in, opt->arg))
1466 /* Disable push_command_line_include callback for now. */
1467 include_cursor = deferred_count + 1;
1468 cpp_scan_nooutput (parse_in);
1474 push_command_line_include ();
1477 /* Give CPP the next file given by -include, if any. */
1479 push_command_line_include (void)
1481 while (include_cursor < deferred_count)
1483 struct deferred_opt *opt = &deferred_opts[include_cursor++];
1485 if (!cpp_opts->preprocessed && opt->code == OPT_include
1486 && cpp_push_include (parse_in, opt->arg))
1490 if (include_cursor == deferred_count)
1493 /* -Wunused-macros should only warn about macros defined hereafter. */
1494 cpp_opts->warn_unused_macros = warn_unused_macros;
1495 /* Restore the line map from <command line>. */
1496 if (!cpp_opts->preprocessed)
1497 cpp_change_file (parse_in, LC_RENAME, this_input_filename);
1499 /* Set this here so the client can change the option if it wishes,
1500 and after stacking the main file so we don't trace the main file. */
1501 line_table.trace_includes = cpp_opts->print_include_names;
1505 /* File change callback. Has to handle -include files. */
1507 cb_file_change (cpp_reader * ARG_UNUSED (pfile),
1508 const struct line_map *new_map)
1510 if (flag_preprocess_only)
1511 pp_file_change (new_map);
1513 fe_file_change (new_map);
1515 if (new_map == 0 || (new_map->reason == LC_LEAVE && MAIN_FILE_P (new_map)))
1516 push_command_line_include ();
1520 cb_dir_change (cpp_reader * ARG_UNUSED (pfile), const char *dir)
1522 if (!set_src_pwd (dir))
1523 warning (0, "too late for # directive to set debug directory");
1526 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1527 extensions if ISO). There is no concept of gnu94. */
1529 set_std_c89 (int c94, int iso)
1531 cpp_set_lang (parse_in, c94 ? CLK_STDC94: iso ? CLK_STDC89: CLK_GNUC89);
1534 flag_no_gnu_keywords = iso;
1535 flag_no_nonansi_builtin = iso;
1540 /* Set the C 99 standard (without GNU extensions if ISO). */
1542 set_std_c99 (int iso)
1544 cpp_set_lang (parse_in, iso ? CLK_STDC99: CLK_GNUC99);
1546 flag_no_nonansi_builtin = iso;
1552 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1554 set_std_cxx98 (int iso)
1556 cpp_set_lang (parse_in, iso ? CLK_CXX98: CLK_GNUCXX);
1557 flag_no_gnu_keywords = iso;
1558 flag_no_nonansi_builtin = iso;
1562 /* Set the C++ 0x working draft "standard" (without GNU extensions if ISO). */
1564 set_std_cxx0x (int iso)
1566 cpp_set_lang (parse_in, iso ? CLK_CXX0X: CLK_GNUCXX0X);
1567 flag_no_gnu_keywords = iso;
1568 flag_no_nonansi_builtin = iso;
1573 /* Handle setting implicit to ON. */
1575 set_Wimplicit (int on)
1578 warn_implicit_int = on;
1579 warn_implicit_function_declaration = on;
1582 /* Args to -d specify what to dump. Silently ignore
1583 unrecognized options; they may be aimed at toplev.c. */
1585 handle_OPT_d (const char *arg)
1589 while ((c = *arg++) != '\0')
1592 case 'M': /* Dump macros only. */
1593 case 'N': /* Dump names. */
1594 case 'D': /* Dump definitions. */
1595 flag_dump_macros = c;
1599 flag_dump_includes = 1;