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
24 /* Merged C99 inline changes from gcc trunk 122565 2007-03-05 */
28 #include "coretypes.h"
35 #include "langhooks.h"
36 #include "tree-inline.h"
37 #include "diagnostic.h"
39 #include "cppdefault.h"
40 #include "c-incpath.h"
41 #include "debug.h" /* For debug_hooks. */
46 #ifndef DOLLARS_IN_IDENTIFIERS
47 # define DOLLARS_IN_IDENTIFIERS true
50 #ifndef TARGET_SYSTEM_ROOT
51 # define TARGET_SYSTEM_ROOT NULL
55 #define TARGET_OPTF(ARG)
59 static cpp_options *cpp_opts;
62 static const char *this_input_filename;
64 /* Filename and stream for preprocessed output. */
65 static const char *out_fname;
66 static FILE *out_stream;
68 /* Append dependencies to deps_file. */
69 static bool deps_append;
71 /* If dependency switches (-MF etc.) have been given. */
72 static bool deps_seen;
77 /* If -lang-fortran seen. */
78 static bool lang_fortran = false;
80 /* Dependency output file. */
81 static const char *deps_file;
83 /* The prefix given by -iprefix, if any. */
84 static const char *iprefix;
86 /* The multilib directory given by -imultilib, if any. */
87 static const char *imultilib;
89 /* The system root, if any. Overridden by -isysroot. */
90 static const char *sysroot = TARGET_SYSTEM_ROOT;
92 /* Zero disables all standard directories for headers. */
93 static bool std_inc = true;
95 /* Zero disables the C++-specific standard directories for headers. */
96 static bool std_cxx_inc = true;
98 /* If the quote chain has been split by -I-. */
99 static bool quote_chain_split;
101 /* If -Wunused-macros. */
102 static bool warn_unused_macros;
104 /* If -Wvariadic-macros. */
105 static bool warn_variadic_macros = true;
107 /* Number of deferred options. */
108 static size_t deferred_count;
110 /* Number of deferred options scanned for -include. */
111 static size_t include_cursor;
113 static void set_Wimplicit (int);
114 static void handle_OPT_d (const char *);
115 static void set_std_cxx98 (int);
116 static void set_std_c89 (int, int);
117 static void set_std_c99 (int);
118 static void check_deps_environment_vars (void);
119 static void handle_deferred_opts (void);
120 static void sanitize_cpp_opts (void);
121 static void add_prefixed_path (const char *, size_t);
122 static void push_command_line_include (void);
123 static void cb_file_change (cpp_reader *, const struct line_map *);
124 static void cb_dir_change (cpp_reader *, const char *);
125 static void finish_options (void);
127 #ifndef STDC_0_IN_SYSTEM_HEADERS
128 #define STDC_0_IN_SYSTEM_HEADERS 0
131 /* Holds switches parsed by c_common_handle_option (), but whose
132 handling is deferred to c_common_post_options (). */
133 static void defer_opt (enum opt_code, const char *);
134 static struct deferred_opt
140 /* Complain that switch CODE expects an argument but none was
141 provided. OPT was the command-line option. Return FALSE to get
142 the default message in opts.c, TRUE if we provide a specialized
145 c_common_missing_argument (const char *opt, size_t code)
150 /* Pick up the default message. */
153 case OPT_fconstant_string_class_:
154 error ("no class name specified with %qs", opt);
158 error ("assertion missing after %qs", opt);
163 error ("macro name missing after %qs", opt);
172 error ("missing path after %qs", opt);
181 error ("missing filename after %qs", opt);
186 error ("missing makefile target after %qs", opt);
193 /* Defer option CODE with argument ARG. */
195 defer_opt (enum opt_code code, const char *arg)
197 deferred_opts[deferred_count].code = code;
198 deferred_opts[deferred_count].arg = arg;
202 /* Common initialization before parsing options. */
204 c_common_init_options (unsigned int argc, const char **argv)
206 static const unsigned int lang_flags[] = {CL_C, CL_ObjC, CL_CXX, CL_ObjCXX};
207 unsigned int i, result;
209 /* This is conditionalized only because that is the way the front
210 ends used to do it. Maybe this should be unconditional? */
211 if (c_dialect_cxx ())
213 /* By default wrap lines at 80 characters. Is getenv
214 ("COLUMNS") preferable? */
215 diagnostic_line_cutoff (global_dc) = 80;
216 /* By default, emit location information once for every
217 diagnostic message. */
218 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
221 parse_in = cpp_create_reader (c_dialect_cxx () ? CLK_GNUCXX: CLK_GNUC89,
222 ident_hash, &line_table);
224 cpp_opts = cpp_get_options (parse_in);
225 cpp_opts->dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
226 cpp_opts->objc = c_dialect_objc ();
228 /* Reset to avoid warnings on internal definitions. We set it just
229 before passing on command-line options to cpplib. */
230 cpp_opts->warn_dollars = 0;
232 flag_exceptions = c_dialect_cxx ();
233 warn_pointer_arith = c_dialect_cxx ();
234 warn_write_strings = c_dialect_cxx();
236 deferred_opts = XNEWVEC (struct deferred_opt, argc);
238 result = lang_flags[c_language];
240 if (c_language == clk_c)
242 /* If preprocessing assembly language, accept any of the C-family
243 front end options since the driver may pass them through. */
244 for (i = 1; i < argc; i++)
245 if (! strcmp (argv[i], "-lang-asm"))
247 result |= CL_C | CL_ObjC | CL_CXX | CL_ObjCXX;
252 for (i = 1; i < argc; i++)
253 if (! strcmp (argv[i], "-lang-fortran"))
255 result |= CL_Fortran;
264 /* Handle switch SCODE with argument ARG. VALUE is true, unless no-
265 form of an -f or -W option was given. Returns 0 if the switch was
266 invalid, a negative number to prevent language-independent
267 processing in toplev.c (a hack necessary for the short-term). */
269 c_common_handle_option (size_t scode, const char *arg, int value)
271 const struct cl_option *option = &cl_options[scode];
272 enum opt_code code = (enum opt_code) scode;
275 /* Prevent resetting the language standard to a C dialect when the driver
276 has already determined that we're looking at assembler input. */
277 bool preprocessing_asm_p = (cpp_get_options (parse_in)->lang == CLK_ASM);
282 if (cl_options[code].flags & (CL_C | CL_CXX | CL_ObjC | CL_ObjCXX))
285 if (lang_fortran && (cl_options[code].flags & (CL_Fortran)))
291 case OPT__output_pch_:
296 defer_opt (code, arg);
300 cpp_opts->discard_comments = 0;
304 cpp_opts->discard_comments = 0;
305 cpp_opts->discard_comments_in_macro_exp = 0;
309 defer_opt (code, arg);
313 flag_preprocess_only = 1;
317 cpp_opts->print_include_names = 1;
321 TARGET_OPTF (xstrdup (arg));
325 if (strcmp (arg, "-"))
326 add_path (xstrdup (arg), BRACKET, 0, true);
329 if (quote_chain_split)
330 error ("-I- specified twice");
331 quote_chain_split = true;
332 split_quote_chain ();
333 inform ("obsolete option -I- used, please use -iquote instead");
339 /* When doing dependencies with -M or -MM, suppress normal
340 preprocessed output, but still do -dM etc. as software
341 depends on this. Preprocessed output does occur if -MD, -MMD
342 or environment var dependency generation is used. */
343 cpp_opts->deps.style = (code == OPT_M ? DEPS_SYSTEM: DEPS_USER);
345 cpp_opts->inhibit_warnings = 1;
350 cpp_opts->deps.style = (code == OPT_MD ? DEPS_SYSTEM: DEPS_USER);
361 cpp_opts->deps.missing_files = true;
366 cpp_opts->deps.phony_targets = true;
372 defer_opt (code, arg);
376 flag_no_line_commands = 1;
379 case OPT_fworking_directory:
380 flag_working_directory = value;
384 defer_opt (code, arg);
388 /* APPLE LOCAL -Wmost */
392 set_Wimplicit (value);
393 warn_char_subscripts = value;
394 warn_missing_braces = value;
395 /* APPLE LOCAL begin -Wmost --dpatel */
396 if (code != OPT_Wmost)
397 warn_parentheses = value;
398 /* APPLE LOCAL end -Wmost --dpatel */
399 warn_return_type = value;
400 warn_sequence_point = value; /* Was C only. */
401 if (c_dialect_cxx ())
402 warn_sign_compare = value;
404 warn_strict_aliasing = value;
405 warn_strict_overflow = value;
406 warn_address = value;
408 /* Only warn about unknown pragmas that are not in system
410 warn_unknown_pragmas = value;
412 /* We save the value of warn_uninitialized, since if they put
413 -Wuninitialized on the command line, we need to generate a
414 warning about not using it without also specifying -O. */
415 if (warn_uninitialized != 1)
416 warn_uninitialized = (value ? 2 : 0);
418 if (!c_dialect_cxx ())
419 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding
420 can turn it off only if it's not explicit. */
421 warn_main = value * 2;
424 /* C++-specific warnings. */
425 warn_reorder = value;
426 warn_nontemplate_friend = value;
429 cpp_opts->warn_trigraphs = value;
430 cpp_opts->warn_comments = value;
431 cpp_opts->warn_num_sign_change = value;
432 cpp_opts->warn_multichar = value; /* Was C++ only. */
434 if (warn_pointer_sign == -1)
435 warn_pointer_sign = 1;
440 cpp_opts->warn_comments = value;
443 case OPT_Wdeprecated:
444 cpp_opts->warn_deprecated = value;
447 case OPT_Wendif_labels:
448 cpp_opts->warn_endif_labels = value;
452 cpp_opts->warnings_are_errors = value;
453 global_dc->warning_as_error_requested = value;
456 case OPT_Werror_implicit_function_declaration:
457 mesg_implicit_function_declaration = 2;
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_fms_extensions:
715 flag_ms_extensions = value;
718 case OPT_fnext_runtime:
719 flag_next_runtime = value;
722 case OPT_fnil_receivers:
723 flag_nil_receivers = value;
726 case OPT_fnonansi_builtins:
727 flag_no_nonansi_builtin = !value;
730 case OPT_foperator_names:
731 cpp_opts->operator_names = value;
734 case OPT_foptional_diags:
735 flag_optional_diags = value;
739 cpp_opts->restore_pch_deps = value;
742 case OPT_fpch_preprocess:
743 flag_pch_preprocess = value;
746 case OPT_fpermissive:
747 flag_permissive = value;
750 case OPT_fpreprocessed:
751 cpp_opts->preprocessed = value;
754 case OPT_freplace_objc_classes:
755 flag_replace_objc_classes = value;
759 flag_use_repository = value;
761 flag_implicit_templates = 0;
768 case OPT_fshow_column:
769 cpp_opts->show_column = value;
773 flag_detailed_statistics = value;
777 /* It is documented that we silently ignore silly values. */
778 if (value >= 1 && value <= 100)
779 cpp_opts->tabstop = value;
782 case OPT_fexec_charset_:
783 cpp_opts->narrow_charset = arg;
786 case OPT_fwide_exec_charset_:
787 cpp_opts->wide_charset = arg;
790 case OPT_finput_charset_:
791 cpp_opts->input_charset = arg;
794 case OPT_ftemplate_depth_:
795 max_tinst_depth = value;
798 case OPT_fuse_cxa_atexit:
799 flag_use_cxa_atexit = value;
802 case OPT_fuse_cxa_get_exception_ptr:
803 flag_use_cxa_get_exception_ptr = value;
806 case OPT_fvisibility_inlines_hidden:
807 visibility_options.inlines_hidden = value;
814 case OPT_fthreadsafe_statics:
815 flag_threadsafe_statics = value;
819 flag_zero_link = value;
823 flag_gen_declaration = 1;
826 case OPT_femit_struct_debug_baseonly:
827 set_struct_debug_option ("base");
830 case OPT_femit_struct_debug_reduced:
831 set_struct_debug_option ("dir:ord:sys,dir:gen:any,ind:base");
834 case OPT_femit_struct_debug_detailed_:
835 set_struct_debug_option (arg);
839 add_path (xstrdup (arg), AFTER, 0, true);
844 defer_opt (code, arg);
856 add_path (xstrdup (arg), QUOTE, 0, true);
864 add_path (xstrdup (arg), SYSTEM, 0, true);
867 case OPT_iwithprefix:
868 add_prefixed_path (arg, SYSTEM);
871 case OPT_iwithprefixbefore:
872 add_prefixed_path (arg, BRACKET);
876 cpp_set_lang (parse_in, CLK_ASM);
877 cpp_opts->dollars_in_ident = false;
880 case OPT_lang_fortran:
900 error ("output filename specified twice");
903 /* We need to handle the -pedantic switches here, rather than in
904 c_common_post_options, so that a subsequent -Wno-endif-labels
905 is not overridden. */
906 case OPT_pedantic_errors:
907 cpp_opts->pedantic_errors = 1;
910 cpp_opts->pedantic = 1;
911 cpp_opts->warn_endif_labels = 1;
912 if (warn_pointer_sign == -1)
913 warn_pointer_sign = 1;
914 if (warn_overlength_strings == -1)
915 warn_overlength_strings = 1;
918 case OPT_print_objc_runtime_info:
919 print_struct_values = 1;
922 case OPT_print_pch_checksum:
923 c_common_print_pch_checksum (stdout);
924 exit_after_options = true;
932 case OPT_std_gnu__98:
933 if (!preprocessing_asm_p)
934 set_std_cxx98 (code == OPT_std_c__98 /* ISO */);
938 case OPT_std_iso9899_1990:
939 case OPT_std_iso9899_199409:
940 if (!preprocessing_asm_p)
941 set_std_c89 (code == OPT_std_iso9899_199409 /* c94 */, true /* ISO */);
945 if (!preprocessing_asm_p)
946 set_std_c89 (false /* c94 */, false /* ISO */);
951 case OPT_std_iso9899_1999:
952 case OPT_std_iso9899_199x:
953 if (!preprocessing_asm_p)
954 set_std_c99 (true /* ISO */);
959 if (!preprocessing_asm_p)
960 set_std_c99 (false /* ISO */);
964 cpp_opts->trigraphs = 1;
967 case OPT_traditional_cpp:
968 cpp_opts->traditional = 1;
976 cpp_opts->inhibit_warnings = 1;
987 /* Post-switch processing. */
989 c_common_post_options (const char **pfilename)
991 struct cpp_callbacks *cb;
993 /* Canonicalize the input and output filenames. */
994 if (in_fnames == NULL)
996 in_fnames = XNEWVEC (const char *, 1);
999 else if (strcmp (in_fnames[0], "-") == 0)
1002 if (out_fname == NULL || !strcmp (out_fname, "-"))
1005 if (cpp_opts->deps.style == DEPS_NONE)
1006 check_deps_environment_vars ();
1008 handle_deferred_opts ();
1010 sanitize_cpp_opts ();
1012 register_include_chains (parse_in, sysroot, iprefix, imultilib,
1013 std_inc, std_cxx_inc && c_dialect_cxx (), verbose);
1015 #ifdef C_COMMON_OVERRIDE_OPTIONS
1016 /* Some machines may reject certain combinations of C
1017 language-specific options. */
1018 C_COMMON_OVERRIDE_OPTIONS;
1021 flag_inline_trees = 1;
1023 /* Use tree inlining. */
1024 if (!flag_no_inline)
1026 if (flag_inline_functions)
1027 flag_inline_trees = 2;
1029 /* By default we use C99 inline semantics in GNU99 or C99 mode. C99
1030 inline semantics are not supported in GNU89 or C89 mode. */
1031 if (flag_gnu89_inline == -1)
1032 flag_gnu89_inline = !flag_isoc99;
1033 else if (!flag_gnu89_inline && !flag_isoc99)
1034 error ("-fno-gnu89-inline is only supported in GNU99 or C99 mode");
1036 /* If we are given more than one input file, we must use
1037 unit-at-a-time mode. */
1038 if (num_in_fnames > 1)
1039 flag_unit_at_a_time = 1;
1041 /* Default to ObjC sjlj exception handling if NeXT runtime. */
1042 if (flag_objc_sjlj_exceptions < 0)
1043 flag_objc_sjlj_exceptions = flag_next_runtime;
1044 if (flag_objc_exceptions && !flag_objc_sjlj_exceptions)
1045 flag_exceptions = 1;
1047 /* -Wextra implies -Wsign-compare, -Wmissing-field-initializers and
1048 -Woverride-init, but not if explicitly overridden. */
1049 if (warn_sign_compare == -1)
1050 warn_sign_compare = extra_warnings;
1051 if (warn_missing_field_initializers == -1)
1052 warn_missing_field_initializers = extra_warnings;
1053 if (warn_override_init == -1)
1054 warn_override_init = extra_warnings;
1056 /* -Wpointer_sign is disabled by default, but it is enabled if any
1057 of -Wall or -pedantic are given. */
1058 if (warn_pointer_sign == -1)
1059 warn_pointer_sign = 0;
1061 /* -Woverlength-strings is off by default, but is enabled by -pedantic.
1062 It is never enabled in C++, as the minimum limit is not normative
1063 in that standard. */
1064 if (warn_overlength_strings == -1 || c_dialect_cxx ())
1065 warn_overlength_strings = 0;
1067 /* Special format checking options don't work without -Wformat; warn if
1071 warning (OPT_Wformat_y2k,
1072 "-Wformat-y2k ignored without -Wformat");
1073 warning (OPT_Wformat_extra_args,
1074 "-Wformat-extra-args ignored without -Wformat");
1075 warning (OPT_Wformat_zero_length,
1076 "-Wformat-zero-length ignored without -Wformat");
1077 warning (OPT_Wformat_nonliteral,
1078 "-Wformat-nonliteral ignored without -Wformat");
1079 warning (OPT_Wformat_security,
1080 "-Wformat-security ignored without -Wformat");
1083 /* C99 requires special handling of complex multiplication and division;
1084 -ffast-math and -fcx-limited-range are handled in process_options. */
1086 flag_complex_method = 2;
1088 if (flag_preprocess_only)
1090 /* Open the output now. We must do so even if flag_no_output is
1091 on, because there may be other output than from the actual
1092 preprocessing (e.g. from -dM). */
1093 if (out_fname[0] == '\0')
1094 out_stream = stdout;
1096 out_stream = fopen (out_fname, "w");
1098 if (out_stream == NULL)
1100 fatal_error ("opening output file %s: %m", out_fname);
1104 if (num_in_fnames > 1)
1105 error ("too many filenames given. Type %s --help for usage",
1108 init_pp_output (out_stream);
1114 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1115 input_location = UNKNOWN_LOCATION;
1118 cb = cpp_get_callbacks (parse_in);
1119 cb->file_change = cb_file_change;
1120 cb->dir_change = cb_dir_change;
1121 cpp_post_options (parse_in);
1123 input_location = UNKNOWN_LOCATION;
1125 /* If an error has occurred in cpplib, note it so we fail
1127 errorcount += cpp_errors (parse_in);
1129 *pfilename = this_input_filename
1130 = cpp_read_main_file (parse_in, in_fnames[0]);
1131 /* Don't do any compilation or preprocessing if there is no input file. */
1132 if (this_input_filename == NULL)
1138 if (flag_working_directory
1139 && flag_preprocess_only && !flag_no_line_commands)
1140 pp_dir_change (parse_in, get_src_pwd ());
1142 return flag_preprocess_only;
1145 /* Front end initialization common to C, ObjC and C++. */
1147 c_common_init (void)
1149 /* Set up preprocessor arithmetic. Must be done after call to
1150 c_common_nodes_and_builtins for type nodes to be good. */
1151 cpp_opts->precision = TYPE_PRECISION (intmax_type_node);
1152 cpp_opts->char_precision = TYPE_PRECISION (char_type_node);
1153 cpp_opts->int_precision = TYPE_PRECISION (integer_type_node);
1154 cpp_opts->wchar_precision = TYPE_PRECISION (wchar_type_node);
1155 cpp_opts->unsigned_wchar = TYPE_UNSIGNED (wchar_type_node);
1156 cpp_opts->bytes_big_endian = BYTES_BIG_ENDIAN;
1158 /* This can't happen until after wchar_precision and bytes_big_endian
1160 cpp_init_iconv (parse_in);
1163 c_common_print_pch_checksum (stderr);
1165 if (flag_preprocess_only)
1168 preprocess_file (parse_in);
1172 /* Has to wait until now so that cpplib has its hash table. */
1178 /* Initialize the integrated preprocessor after debug output has been
1179 initialized; loop over each input file. */
1181 c_common_parse_file (int set_yydebug)
1185 /* Enable parser debugging, if requested and we can. If requested
1186 and we can't, notify the user. */
1188 yydebug = set_yydebug;
1191 warning (0, "YYDEBUG was not defined at build time, -dy ignored");
1197 /* Start the main input file, if the debug writer wants it. */
1198 if (debug_hooks->start_end_main_source_file)
1199 (*debug_hooks->start_source_file) (0, this_input_filename);
1206 /* And end the main input file, if the debug writer wants it */
1207 if (debug_hooks->start_end_main_source_file)
1208 (*debug_hooks->end_source_file) (0);
1209 if (++i >= num_in_fnames)
1211 cpp_undef_all (parse_in);
1213 = cpp_read_main_file (parse_in, in_fnames[i]);
1214 /* If an input file is missing, abandon further compilation.
1215 cpplib has issued a diagnostic. */
1216 if (!this_input_filename)
1221 /* Common finish hook for the C, ObjC and C++ front ends. */
1223 c_common_finish (void)
1225 FILE *deps_stream = NULL;
1227 if (cpp_opts->deps.style != DEPS_NONE)
1229 /* If -M or -MM was seen without -MF, default output to the
1232 deps_stream = out_stream;
1235 deps_stream = fopen (deps_file, deps_append ? "a": "w");
1237 fatal_error ("opening dependency file %s: %m", deps_file);
1241 /* For performance, avoid tearing down cpplib's internal structures
1242 with cpp_destroy (). */
1243 errorcount += cpp_finish (parse_in, deps_stream);
1245 if (deps_stream && deps_stream != out_stream
1246 && (ferror (deps_stream) || fclose (deps_stream)))
1247 fatal_error ("closing dependency file %s: %m", deps_file);
1249 if (out_stream && (ferror (out_stream) || fclose (out_stream)))
1250 fatal_error ("when writing output to %s: %m", out_fname);
1253 /* Either of two environment variables can specify output of
1254 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1255 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1256 and DEPS_TARGET is the target to mention in the deps. They also
1257 result in dependency information being appended to the output file
1258 rather than overwriting it, and like Sun's compiler
1259 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1261 check_deps_environment_vars (void)
1265 GET_ENVIRONMENT (spec, "DEPENDENCIES_OUTPUT");
1267 cpp_opts->deps.style = DEPS_USER;
1270 GET_ENVIRONMENT (spec, "SUNPRO_DEPENDENCIES");
1273 cpp_opts->deps.style = DEPS_SYSTEM;
1274 cpp_opts->deps.ignore_main_file = true;
1280 /* Find the space before the DEPS_TARGET, if there is one. */
1281 char *s = strchr (spec, ' ');
1284 /* Let the caller perform MAKE quoting. */
1285 defer_opt (OPT_MT, s + 1);
1289 /* Command line -MF overrides environment variables and default. */
1298 /* Handle deferred command line switches. */
1300 handle_deferred_opts (void)
1305 /* Avoid allocating the deps buffer if we don't need it.
1306 (This flag may be true without there having been -MT or -MQ
1307 options, but we'll still need the deps buffer.) */
1311 deps = cpp_get_deps (parse_in);
1313 for (i = 0; i < deferred_count; i++)
1315 struct deferred_opt *opt = &deferred_opts[i];
1317 if (opt->code == OPT_MT || opt->code == OPT_MQ)
1318 deps_add_target (deps, opt->arg, opt->code == OPT_MQ);
1322 /* These settings are appropriate for GCC, but not necessarily so for
1323 cpplib as a library. */
1325 sanitize_cpp_opts (void)
1327 /* If we don't know what style of dependencies to output, complain
1328 if any other dependency switches have been given. */
1329 if (deps_seen && cpp_opts->deps.style == DEPS_NONE)
1330 error ("to generate dependencies you must specify either -M or -MM");
1332 /* -dM and dependencies suppress normal output; do it here so that
1333 the last -d[MDN] switch overrides earlier ones. */
1334 if (flag_dump_macros == 'M')
1337 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1338 -dM since at least glibc relies on -M -dM to work. */
1339 /* Also, flag_no_output implies flag_no_line_commands, always. */
1342 if (flag_dump_macros != 'M')
1343 flag_dump_macros = 0;
1344 flag_dump_includes = 0;
1345 flag_no_line_commands = 1;
1348 cpp_opts->unsigned_char = !flag_signed_char;
1349 cpp_opts->stdc_0_in_system_headers = STDC_0_IN_SYSTEM_HEADERS;
1351 /* We want -Wno-long-long to override -pedantic -std=non-c99
1352 and/or -Wtraditional, whatever the ordering. */
1353 cpp_opts->warn_long_long
1354 = warn_long_long && ((!flag_isoc99 && pedantic) || warn_traditional);
1356 /* Similarly with -Wno-variadic-macros. No check for c99 here, since
1357 this also turns off warnings about GCCs extension. */
1358 cpp_opts->warn_variadic_macros
1359 = warn_variadic_macros && (pedantic || warn_traditional);
1361 /* If we're generating preprocessor output, emit current directory
1362 if explicitly requested or if debugging information is enabled.
1363 ??? Maybe we should only do it for debugging formats that
1364 actually output the current directory? */
1365 if (flag_working_directory == -1)
1366 flag_working_directory = (debug_info_level != DINFO_LEVEL_NONE);
1369 /* Add include path with a prefix at the front of its name. */
1371 add_prefixed_path (const char *suffix, size_t chain)
1375 size_t prefix_len, suffix_len;
1377 suffix_len = strlen (suffix);
1378 prefix = iprefix ? iprefix : cpp_GCC_INCLUDE_DIR;
1379 prefix_len = iprefix ? strlen (iprefix) : cpp_GCC_INCLUDE_DIR_len;
1381 path = (char *) xmalloc (prefix_len + suffix_len + 1);
1382 memcpy (path, prefix, prefix_len);
1383 memcpy (path + prefix_len, suffix, suffix_len);
1384 path[prefix_len + suffix_len] = '\0';
1386 add_path (path, chain, 0, false);
1389 /* Handle -D, -U, -A, -imacros, and the first -include. */
1391 finish_options (void)
1393 if (!cpp_opts->preprocessed)
1397 cb_file_change (parse_in,
1398 linemap_add (&line_table, LC_RENAME, 0,
1399 _("<built-in>"), 0));
1401 cpp_init_builtins (parse_in, flag_hosted);
1402 c_cpp_builtins (parse_in);
1404 /* We're about to send user input to cpplib, so make it warn for
1405 things that we previously (when we sent it internal definitions)
1406 told it to not warn.
1408 C99 permits implementation-defined characters in identifiers.
1409 The documented meaning of -std= is to turn off extensions that
1410 conflict with the specified standard, and since a strictly
1411 conforming program cannot contain a '$', we do not condition
1412 their acceptance on the -std= setting. */
1413 cpp_opts->warn_dollars = (cpp_opts->pedantic && !cpp_opts->c99);
1415 cb_file_change (parse_in,
1416 linemap_add (&line_table, LC_RENAME, 0,
1417 _("<command-line>"), 0));
1419 for (i = 0; i < deferred_count; i++)
1421 struct deferred_opt *opt = &deferred_opts[i];
1423 if (opt->code == OPT_D)
1424 cpp_define (parse_in, opt->arg);
1425 else if (opt->code == OPT_U)
1426 cpp_undef (parse_in, opt->arg);
1427 else if (opt->code == OPT_A)
1429 if (opt->arg[0] == '-')
1430 cpp_unassert (parse_in, opt->arg + 1);
1432 cpp_assert (parse_in, opt->arg);
1436 /* Handle -imacros after -D and -U. */
1437 for (i = 0; i < deferred_count; i++)
1439 struct deferred_opt *opt = &deferred_opts[i];
1441 if (opt->code == OPT_imacros
1442 && cpp_push_include (parse_in, opt->arg))
1444 /* Disable push_command_line_include callback for now. */
1445 include_cursor = deferred_count + 1;
1446 cpp_scan_nooutput (parse_in);
1452 push_command_line_include ();
1455 /* Give CPP the next file given by -include, if any. */
1457 push_command_line_include (void)
1459 while (include_cursor < deferred_count)
1461 struct deferred_opt *opt = &deferred_opts[include_cursor++];
1463 if (!cpp_opts->preprocessed && opt->code == OPT_include
1464 && cpp_push_include (parse_in, opt->arg))
1468 if (include_cursor == deferred_count)
1471 /* -Wunused-macros should only warn about macros defined hereafter. */
1472 cpp_opts->warn_unused_macros = warn_unused_macros;
1473 /* Restore the line map from <command line>. */
1474 if (!cpp_opts->preprocessed)
1475 cpp_change_file (parse_in, LC_RENAME, this_input_filename);
1477 /* Set this here so the client can change the option if it wishes,
1478 and after stacking the main file so we don't trace the main file. */
1479 line_table.trace_includes = cpp_opts->print_include_names;
1483 /* File change callback. Has to handle -include files. */
1485 cb_file_change (cpp_reader * ARG_UNUSED (pfile),
1486 const struct line_map *new_map)
1488 if (flag_preprocess_only)
1489 pp_file_change (new_map);
1491 fe_file_change (new_map);
1493 if (new_map == 0 || (new_map->reason == LC_LEAVE && MAIN_FILE_P (new_map)))
1494 push_command_line_include ();
1498 cb_dir_change (cpp_reader * ARG_UNUSED (pfile), const char *dir)
1500 if (!set_src_pwd (dir))
1501 warning (0, "too late for # directive to set debug directory");
1504 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1505 extensions if ISO). There is no concept of gnu94. */
1507 set_std_c89 (int c94, int iso)
1509 cpp_set_lang (parse_in, c94 ? CLK_STDC94: iso ? CLK_STDC89: CLK_GNUC89);
1512 flag_no_gnu_keywords = iso;
1513 flag_no_nonansi_builtin = iso;
1518 /* Set the C 99 standard (without GNU extensions if ISO). */
1520 set_std_c99 (int iso)
1522 cpp_set_lang (parse_in, iso ? CLK_STDC99: CLK_GNUC99);
1524 flag_no_nonansi_builtin = iso;
1530 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1532 set_std_cxx98 (int iso)
1534 cpp_set_lang (parse_in, iso ? CLK_CXX98: CLK_GNUCXX);
1535 flag_no_gnu_keywords = iso;
1536 flag_no_nonansi_builtin = iso;
1540 /* Handle setting implicit to ON. */
1542 set_Wimplicit (int on)
1545 warn_implicit_int = on;
1548 if (mesg_implicit_function_declaration != 2)
1549 mesg_implicit_function_declaration = 1;
1552 mesg_implicit_function_declaration = 0;
1555 /* Args to -d specify what to dump. Silently ignore
1556 unrecognized options; they may be aimed at toplev.c. */
1558 handle_OPT_d (const char *arg)
1562 while ((c = *arg++) != '\0')
1565 case 'M': /* Dump macros only. */
1566 case 'N': /* Dump names. */
1567 case 'D': /* Dump definitions. */
1568 flag_dump_macros = c;
1572 flag_dump_includes = 1;