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);
390 set_Wimplicit (value);
391 warn_char_subscripts = value;
392 warn_missing_braces = value;
393 warn_parentheses = value;
394 warn_return_type = value;
395 warn_sequence_point = value; /* Was C only. */
396 if (c_dialect_cxx ())
397 warn_sign_compare = value;
399 set_warn_strict_aliasing (value);
400 warn_strict_overflow = value;
401 warn_address = 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;
424 cpp_opts->warn_trigraphs = value;
425 cpp_opts->warn_comments = value;
426 cpp_opts->warn_num_sign_change = value;
427 cpp_opts->warn_multichar = value; /* Was C++ only. */
429 if (warn_pointer_sign == -1)
430 warn_pointer_sign = 1;
435 cpp_opts->warn_comments = value;
438 case OPT_Wdeprecated:
439 cpp_opts->warn_deprecated = value;
442 case OPT_Wendif_labels:
443 cpp_opts->warn_endif_labels = value;
447 cpp_opts->warnings_are_errors = value;
448 global_dc->warning_as_error_requested = value;
451 case OPT_Werror_implicit_function_declaration:
452 mesg_implicit_function_declaration = 2;
460 set_Wformat (atoi (arg));
464 set_Wimplicit (value);
468 /* Silently ignore for now. */
471 case OPT_Winvalid_pch:
472 cpp_opts->warn_invalid_pch = value;
482 case OPT_Wmissing_include_dirs:
483 cpp_opts->warn_missing_include_dirs = value;
487 cpp_opts->warn_multichar = value;
490 case OPT_Wnormalized_:
491 if (!value || (arg && strcasecmp (arg, "none") == 0))
492 cpp_opts->warn_normalize = normalized_none;
493 else if (!arg || strcasecmp (arg, "nfkc") == 0)
494 cpp_opts->warn_normalize = normalized_KC;
495 else if (strcasecmp (arg, "id") == 0)
496 cpp_opts->warn_normalize = normalized_identifier_C;
497 else if (strcasecmp (arg, "nfc") == 0)
498 cpp_opts->warn_normalize = normalized_C;
500 error ("argument %qs to %<-Wnormalized%> not recognized", arg);
503 case OPT_Wreturn_type:
504 warn_return_type = value;
507 case OPT_Wstrict_null_sentinel:
508 warn_strict_null_sentinel = value;
511 case OPT_Wsystem_headers:
512 cpp_opts->warn_system_headers = value;
515 case OPT_Wtraditional:
516 cpp_opts->warn_traditional = value;
520 cpp_opts->warn_trigraphs = value;
524 cpp_opts->warn_undef = value;
527 case OPT_Wunknown_pragmas:
528 /* Set to greater than 1, so that even unknown pragmas in
529 system headers will be warned about. */
530 warn_unknown_pragmas = value * 2;
533 case OPT_Wunused_macros:
534 warn_unused_macros = value;
537 case OPT_Wvariadic_macros:
538 warn_variadic_macros = value;
541 case OPT_Wwrite_strings:
542 warn_write_strings = value;
548 warn_nonvdtor = true;
552 if (!c_dialect_cxx ())
553 set_std_c89 (false, true);
555 set_std_cxx98 (true);
562 case OPT_fcond_mismatch:
563 if (!c_dialect_cxx ())
565 flag_cond_mismatch = value;
570 case OPT_fall_virtual:
571 case OPT_falt_external_templates:
572 case OPT_fenum_int_equiv:
573 case OPT_fexternal_templates:
574 case OPT_fguiding_decls:
576 case OPT_fhuge_objects:
578 case OPT_fname_mangling_version_:
580 case OPT_fnonnull_objects:
582 case OPT_fstrict_prototype:
583 case OPT_fthis_is_variable:
584 case OPT_fvtable_thunks:
587 warning (0, "switch %qs is no longer supported", option->opt_text);
590 case OPT_faccess_control:
591 flag_access_control = value;
595 flag_no_asm = !value;
599 flag_no_builtin = !value;
606 disable_builtin_function (arg);
609 case OPT_fdirectives_only:
610 cpp_opts->directives_only = 1;
613 case OPT_fdollars_in_identifiers:
614 cpp_opts->dollars_in_ident = value;
617 case OPT_ffreestanding:
619 /* Fall through.... */
622 flag_no_builtin = !value;
623 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
624 if (!value && warn_main == 2)
628 case OPT_fshort_double:
629 flag_short_double = value;
632 case OPT_fshort_enums:
633 flag_short_enums = value;
636 case OPT_fshort_wchar:
637 flag_short_wchar = value;
640 case OPT_fsigned_bitfields:
641 flag_signed_bitfields = value;
644 case OPT_fsigned_char:
645 flag_signed_char = value;
648 case OPT_funsigned_bitfields:
649 flag_signed_bitfields = !value;
652 case OPT_funsigned_char:
653 flag_signed_char = !value;
657 flag_check_new = value;
660 case OPT_fconserve_space:
661 flag_conserve_space = value;
664 case OPT_fconstant_string_class_:
665 constant_string_class_name = arg;
668 case OPT_fdefault_inline:
669 flag_default_inline = value;
672 case OPT_felide_constructors:
673 flag_elide_constructors = value;
676 case OPT_fenforce_eh_specs:
677 flag_enforce_eh_specs = value;
680 case OPT_fextended_identifiers:
681 cpp_opts->extended_identifiers = value;
685 flag_new_for_scope = value;
688 case OPT_fgnu_keywords:
689 flag_no_gnu_keywords = !value;
692 case OPT_fgnu_runtime:
693 flag_next_runtime = !value;
696 case OPT_fhandle_exceptions:
697 warning (0, "-fhandle-exceptions has been renamed -fexceptions (and is now on by default)");
698 flag_exceptions = value;
701 case OPT_fimplement_inlines:
702 flag_implement_inlines = value;
705 case OPT_fimplicit_inline_templates:
706 flag_implicit_inline_templates = value;
709 case OPT_fimplicit_templates:
710 flag_implicit_templates = value;
713 case OPT_fms_extensions:
714 flag_ms_extensions = value;
717 case OPT_fnext_runtime:
718 flag_next_runtime = value;
721 case OPT_fnil_receivers:
722 flag_nil_receivers = value;
725 case OPT_fnonansi_builtins:
726 flag_no_nonansi_builtin = !value;
729 case OPT_foperator_names:
730 cpp_opts->operator_names = value;
733 case OPT_foptional_diags:
734 flag_optional_diags = value;
738 cpp_opts->restore_pch_deps = value;
741 case OPT_fpch_preprocess:
742 flag_pch_preprocess = value;
745 case OPT_fpermissive:
746 flag_permissive = value;
749 case OPT_fpreprocessed:
750 cpp_opts->preprocessed = value;
753 case OPT_freplace_objc_classes:
754 flag_replace_objc_classes = value;
758 flag_use_repository = value;
760 flag_implicit_templates = 0;
767 case OPT_fshow_column:
768 cpp_opts->show_column = value;
772 flag_detailed_statistics = value;
776 /* It is documented that we silently ignore silly values. */
777 if (value >= 1 && value <= 100)
778 cpp_opts->tabstop = value;
781 case OPT_fexec_charset_:
782 cpp_opts->narrow_charset = arg;
785 case OPT_fwide_exec_charset_:
786 cpp_opts->wide_charset = arg;
789 case OPT_finput_charset_:
790 cpp_opts->input_charset = arg;
793 case OPT_ftemplate_depth_:
794 max_tinst_depth = value;
797 case OPT_fuse_cxa_atexit:
798 flag_use_cxa_atexit = value;
801 case OPT_fuse_cxa_get_exception_ptr:
802 flag_use_cxa_get_exception_ptr = value;
805 case OPT_fvisibility_inlines_hidden:
806 visibility_options.inlines_hidden = value;
813 case OPT_fthreadsafe_statics:
814 flag_threadsafe_statics = value;
818 flag_zero_link = value;
822 flag_gen_declaration = 1;
825 case OPT_femit_struct_debug_baseonly:
826 set_struct_debug_option ("base");
829 case OPT_femit_struct_debug_reduced:
830 set_struct_debug_option ("dir:ord:sys,dir:gen:any,ind:base");
833 case OPT_femit_struct_debug_detailed_:
834 set_struct_debug_option (arg);
838 add_path (xstrdup (arg), AFTER, 0, true);
843 defer_opt (code, arg);
855 add_path (xstrdup (arg), QUOTE, 0, true);
863 add_path (xstrdup (arg), SYSTEM, 0, true);
866 case OPT_iwithprefix:
867 add_prefixed_path (arg, SYSTEM);
870 case OPT_iwithprefixbefore:
871 add_prefixed_path (arg, BRACKET);
875 cpp_set_lang (parse_in, CLK_ASM);
876 cpp_opts->dollars_in_ident = false;
879 case OPT_lang_fortran:
899 error ("output filename specified twice");
902 /* We need to handle the -pedantic switches here, rather than in
903 c_common_post_options, so that a subsequent -Wno-endif-labels
904 is not overridden. */
905 case OPT_pedantic_errors:
906 cpp_opts->pedantic_errors = 1;
909 cpp_opts->pedantic = 1;
910 cpp_opts->warn_endif_labels = 1;
911 if (warn_pointer_sign == -1)
912 warn_pointer_sign = 1;
913 if (warn_overlength_strings == -1)
914 warn_overlength_strings = 1;
917 case OPT_print_objc_runtime_info:
918 print_struct_values = 1;
921 case OPT_print_pch_checksum:
922 c_common_print_pch_checksum (stdout);
923 exit_after_options = true;
931 case OPT_std_gnu__98:
932 if (!preprocessing_asm_p)
933 set_std_cxx98 (code == OPT_std_c__98 /* ISO */);
937 case OPT_std_iso9899_1990:
938 case OPT_std_iso9899_199409:
939 if (!preprocessing_asm_p)
940 set_std_c89 (code == OPT_std_iso9899_199409 /* c94 */, true /* ISO */);
944 if (!preprocessing_asm_p)
945 set_std_c89 (false /* c94 */, false /* ISO */);
950 case OPT_std_iso9899_1999:
951 case OPT_std_iso9899_199x:
952 if (!preprocessing_asm_p)
953 set_std_c99 (true /* ISO */);
958 if (!preprocessing_asm_p)
959 set_std_c99 (false /* ISO */);
963 cpp_opts->trigraphs = 1;
966 case OPT_traditional_cpp:
967 cpp_opts->traditional = 1;
975 cpp_opts->inhibit_warnings = 1;
986 /* Post-switch processing. */
988 c_common_post_options (const char **pfilename)
990 struct cpp_callbacks *cb;
992 /* Canonicalize the input and output filenames. */
993 if (in_fnames == NULL)
995 in_fnames = XNEWVEC (const char *, 1);
998 else if (strcmp (in_fnames[0], "-") == 0)
1001 if (out_fname == NULL || !strcmp (out_fname, "-"))
1004 if (cpp_opts->deps.style == DEPS_NONE)
1005 check_deps_environment_vars ();
1007 handle_deferred_opts ();
1009 sanitize_cpp_opts ();
1011 register_include_chains (parse_in, sysroot, iprefix, imultilib,
1012 std_inc, std_cxx_inc && c_dialect_cxx (), verbose);
1014 #ifdef C_COMMON_OVERRIDE_OPTIONS
1015 /* Some machines may reject certain combinations of C
1016 language-specific options. */
1017 C_COMMON_OVERRIDE_OPTIONS;
1020 flag_inline_trees = 1;
1022 /* Use tree inlining. */
1023 if (!flag_no_inline)
1025 if (flag_inline_functions)
1026 flag_inline_trees = 2;
1028 /* By default we use C99 inline semantics in GNU99 or C99 mode. C99
1029 inline semantics are not supported in GNU89 or C89 mode. */
1030 if (flag_gnu89_inline == -1)
1031 flag_gnu89_inline = !flag_isoc99;
1032 else if (!flag_gnu89_inline && !flag_isoc99)
1033 error ("-fno-gnu89-inline is only supported in GNU99 or C99 mode");
1035 /* If we are given more than one input file, we must use
1036 unit-at-a-time mode. */
1037 if (num_in_fnames > 1)
1038 flag_unit_at_a_time = 1;
1040 /* Default to ObjC sjlj exception handling if NeXT runtime. */
1041 if (flag_objc_sjlj_exceptions < 0)
1042 flag_objc_sjlj_exceptions = flag_next_runtime;
1043 if (flag_objc_exceptions && !flag_objc_sjlj_exceptions)
1044 flag_exceptions = 1;
1046 /* -Wextra implies -Wsign-compare, -Wmissing-field-initializers and
1047 -Woverride-init, but not if explicitly overridden. */
1048 if (warn_sign_compare == -1)
1049 warn_sign_compare = extra_warnings;
1050 if (warn_missing_field_initializers == -1)
1051 warn_missing_field_initializers = extra_warnings;
1052 if (warn_override_init == -1)
1053 warn_override_init = extra_warnings;
1055 /* -Wpointer_sign is disabled by default, but it is enabled if any
1056 of -Wall or -pedantic are given. */
1057 if (warn_pointer_sign == -1)
1058 warn_pointer_sign = 0;
1060 /* -Woverlength-strings is off by default, but is enabled by -pedantic.
1061 It is never enabled in C++, as the minimum limit is not normative
1062 in that standard. */
1063 if (warn_overlength_strings == -1 || c_dialect_cxx ())
1064 warn_overlength_strings = 0;
1066 /* Special format checking options don't work without -Wformat; warn if
1070 warning (OPT_Wformat_y2k,
1071 "-Wformat-y2k ignored without -Wformat");
1072 warning (OPT_Wformat_extra_args,
1073 "-Wformat-extra-args ignored without -Wformat");
1074 warning (OPT_Wformat_zero_length,
1075 "-Wformat-zero-length ignored without -Wformat");
1076 warning (OPT_Wformat_nonliteral,
1077 "-Wformat-nonliteral ignored without -Wformat");
1078 warning (OPT_Wformat_security,
1079 "-Wformat-security ignored without -Wformat");
1082 /* C99 requires special handling of complex multiplication and division;
1083 -ffast-math and -fcx-limited-range are handled in process_options. */
1085 flag_complex_method = 2;
1087 if (flag_preprocess_only)
1089 /* Open the output now. We must do so even if flag_no_output is
1090 on, because there may be other output than from the actual
1091 preprocessing (e.g. from -dM). */
1092 if (out_fname[0] == '\0')
1093 out_stream = stdout;
1095 out_stream = fopen (out_fname, "w");
1097 if (out_stream == NULL)
1099 fatal_error ("opening output file %s: %m", out_fname);
1103 if (num_in_fnames > 1)
1104 error ("too many filenames given. Type %s --help for usage",
1107 init_pp_output (out_stream);
1113 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1114 input_location = UNKNOWN_LOCATION;
1117 cb = cpp_get_callbacks (parse_in);
1118 cb->file_change = cb_file_change;
1119 cb->dir_change = cb_dir_change;
1120 cpp_post_options (parse_in);
1122 input_location = UNKNOWN_LOCATION;
1124 /* If an error has occurred in cpplib, note it so we fail
1126 errorcount += cpp_errors (parse_in);
1128 *pfilename = this_input_filename
1129 = cpp_read_main_file (parse_in, in_fnames[0]);
1130 /* Don't do any compilation or preprocessing if there is no input file. */
1131 if (this_input_filename == NULL)
1137 if (flag_working_directory
1138 && flag_preprocess_only && !flag_no_line_commands)
1139 pp_dir_change (parse_in, get_src_pwd ());
1141 return flag_preprocess_only;
1144 /* Front end initialization common to C, ObjC and C++. */
1146 c_common_init (void)
1148 /* Set up preprocessor arithmetic. Must be done after call to
1149 c_common_nodes_and_builtins for type nodes to be good. */
1150 cpp_opts->precision = TYPE_PRECISION (intmax_type_node);
1151 cpp_opts->char_precision = TYPE_PRECISION (char_type_node);
1152 cpp_opts->int_precision = TYPE_PRECISION (integer_type_node);
1153 cpp_opts->wchar_precision = TYPE_PRECISION (wchar_type_node);
1154 cpp_opts->unsigned_wchar = TYPE_UNSIGNED (wchar_type_node);
1155 cpp_opts->bytes_big_endian = BYTES_BIG_ENDIAN;
1157 /* This can't happen until after wchar_precision and bytes_big_endian
1159 cpp_init_iconv (parse_in);
1162 c_common_print_pch_checksum (stderr);
1164 if (flag_preprocess_only)
1167 preprocess_file (parse_in);
1171 /* Has to wait until now so that cpplib has its hash table. */
1177 /* Initialize the integrated preprocessor after debug output has been
1178 initialized; loop over each input file. */
1180 c_common_parse_file (int set_yydebug)
1184 /* Enable parser debugging, if requested and we can. If requested
1185 and we can't, notify the user. */
1187 yydebug = set_yydebug;
1190 warning (0, "YYDEBUG was not defined at build time, -dy ignored");
1196 /* Start the main input file, if the debug writer wants it. */
1197 if (debug_hooks->start_end_main_source_file)
1198 (*debug_hooks->start_source_file) (0, this_input_filename);
1205 /* And end the main input file, if the debug writer wants it */
1206 if (debug_hooks->start_end_main_source_file)
1207 (*debug_hooks->end_source_file) (0);
1208 if (++i >= num_in_fnames)
1210 cpp_undef_all (parse_in);
1212 = cpp_read_main_file (parse_in, in_fnames[i]);
1213 /* If an input file is missing, abandon further compilation.
1214 cpplib has issued a diagnostic. */
1215 if (!this_input_filename)
1220 /* Common finish hook for the C, ObjC and C++ front ends. */
1222 c_common_finish (void)
1224 FILE *deps_stream = NULL;
1226 if (cpp_opts->deps.style != DEPS_NONE)
1228 /* If -M or -MM was seen without -MF, default output to the
1231 deps_stream = out_stream;
1234 deps_stream = fopen (deps_file, deps_append ? "a": "w");
1236 fatal_error ("opening dependency file %s: %m", deps_file);
1240 /* For performance, avoid tearing down cpplib's internal structures
1241 with cpp_destroy (). */
1242 errorcount += cpp_finish (parse_in, deps_stream);
1244 if (deps_stream && deps_stream != out_stream
1245 && (ferror (deps_stream) || fclose (deps_stream)))
1246 fatal_error ("closing dependency file %s: %m", deps_file);
1248 if (out_stream && (ferror (out_stream) || fclose (out_stream)))
1249 fatal_error ("when writing output to %s: %m", out_fname);
1252 /* Either of two environment variables can specify output of
1253 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1254 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1255 and DEPS_TARGET is the target to mention in the deps. They also
1256 result in dependency information being appended to the output file
1257 rather than overwriting it, and like Sun's compiler
1258 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1260 check_deps_environment_vars (void)
1264 GET_ENVIRONMENT (spec, "DEPENDENCIES_OUTPUT");
1266 cpp_opts->deps.style = DEPS_USER;
1269 GET_ENVIRONMENT (spec, "SUNPRO_DEPENDENCIES");
1272 cpp_opts->deps.style = DEPS_SYSTEM;
1273 cpp_opts->deps.ignore_main_file = true;
1279 /* Find the space before the DEPS_TARGET, if there is one. */
1280 char *s = strchr (spec, ' ');
1283 /* Let the caller perform MAKE quoting. */
1284 defer_opt (OPT_MT, s + 1);
1288 /* Command line -MF overrides environment variables and default. */
1297 /* Handle deferred command line switches. */
1299 handle_deferred_opts (void)
1304 /* Avoid allocating the deps buffer if we don't need it.
1305 (This flag may be true without there having been -MT or -MQ
1306 options, but we'll still need the deps buffer.) */
1310 deps = cpp_get_deps (parse_in);
1312 for (i = 0; i < deferred_count; i++)
1314 struct deferred_opt *opt = &deferred_opts[i];
1316 if (opt->code == OPT_MT || opt->code == OPT_MQ)
1317 deps_add_target (deps, opt->arg, opt->code == OPT_MQ);
1321 /* These settings are appropriate for GCC, but not necessarily so for
1322 cpplib as a library. */
1324 sanitize_cpp_opts (void)
1326 /* If we don't know what style of dependencies to output, complain
1327 if any other dependency switches have been given. */
1328 if (deps_seen && cpp_opts->deps.style == DEPS_NONE)
1329 error ("to generate dependencies you must specify either -M or -MM");
1331 /* -dM and dependencies suppress normal output; do it here so that
1332 the last -d[MDN] switch overrides earlier ones. */
1333 if (flag_dump_macros == 'M')
1336 /* By default, -fdirectives-only implies -dD. This allows subsequent phases
1337 to perform proper macro expansion. */
1338 if (cpp_opts->directives_only && !cpp_opts->preprocessed && !flag_dump_macros)
1339 flag_dump_macros = 'D';
1341 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1342 -dM since at least glibc relies on -M -dM to work. */
1343 /* Also, flag_no_output implies flag_no_line_commands, always. */
1346 if (flag_dump_macros != 'M')
1347 flag_dump_macros = 0;
1348 flag_dump_includes = 0;
1349 flag_no_line_commands = 1;
1352 cpp_opts->unsigned_char = !flag_signed_char;
1353 cpp_opts->stdc_0_in_system_headers = STDC_0_IN_SYSTEM_HEADERS;
1355 /* We want -Wno-long-long to override -pedantic -std=non-c99
1356 and/or -Wtraditional, whatever the ordering. */
1357 cpp_opts->warn_long_long
1358 = warn_long_long && ((!flag_isoc99 && pedantic) || warn_traditional);
1360 /* Similarly with -Wno-variadic-macros. No check for c99 here, since
1361 this also turns off warnings about GCCs extension. */
1362 cpp_opts->warn_variadic_macros
1363 = warn_variadic_macros && (pedantic || warn_traditional);
1365 /* If we're generating preprocessor output, emit current directory
1366 if explicitly requested or if debugging information is enabled.
1367 ??? Maybe we should only do it for debugging formats that
1368 actually output the current directory? */
1369 if (flag_working_directory == -1)
1370 flag_working_directory = (debug_info_level != DINFO_LEVEL_NONE);
1372 if (cpp_opts->directives_only)
1374 if (warn_unused_macros)
1375 error ("-fdirectives-only is incompatible with -Wunused_macros");
1376 if (cpp_opts->traditional)
1377 error ("-fdirectives-only is incompatible with -traditional");
1381 /* Add include path with a prefix at the front of its name. */
1383 add_prefixed_path (const char *suffix, size_t chain)
1387 size_t prefix_len, suffix_len;
1389 suffix_len = strlen (suffix);
1390 prefix = iprefix ? iprefix : cpp_GCC_INCLUDE_DIR;
1391 prefix_len = iprefix ? strlen (iprefix) : cpp_GCC_INCLUDE_DIR_len;
1393 path = (char *) xmalloc (prefix_len + suffix_len + 1);
1394 memcpy (path, prefix, prefix_len);
1395 memcpy (path + prefix_len, suffix, suffix_len);
1396 path[prefix_len + suffix_len] = '\0';
1398 add_path (path, chain, 0, false);
1401 /* Handle -D, -U, -A, -imacros, and the first -include. */
1403 finish_options (void)
1405 if (!cpp_opts->preprocessed)
1409 cb_file_change (parse_in,
1410 linemap_add (&line_table, LC_RENAME, 0,
1411 _("<built-in>"), 0));
1413 cpp_init_builtins (parse_in, flag_hosted);
1414 c_cpp_builtins (parse_in);
1416 /* We're about to send user input to cpplib, so make it warn for
1417 things that we previously (when we sent it internal definitions)
1418 told it to not warn.
1420 C99 permits implementation-defined characters in identifiers.
1421 The documented meaning of -std= is to turn off extensions that
1422 conflict with the specified standard, and since a strictly
1423 conforming program cannot contain a '$', we do not condition
1424 their acceptance on the -std= setting. */
1425 cpp_opts->warn_dollars = (cpp_opts->pedantic && !cpp_opts->c99);
1427 cb_file_change (parse_in,
1428 linemap_add (&line_table, LC_RENAME, 0,
1429 _("<command-line>"), 0));
1431 for (i = 0; i < deferred_count; i++)
1433 struct deferred_opt *opt = &deferred_opts[i];
1435 if (opt->code == OPT_D)
1436 cpp_define (parse_in, opt->arg);
1437 else if (opt->code == OPT_U)
1438 cpp_undef (parse_in, opt->arg);
1439 else if (opt->code == OPT_A)
1441 if (opt->arg[0] == '-')
1442 cpp_unassert (parse_in, opt->arg + 1);
1444 cpp_assert (parse_in, opt->arg);
1448 /* Handle -imacros after -D and -U. */
1449 for (i = 0; i < deferred_count; i++)
1451 struct deferred_opt *opt = &deferred_opts[i];
1453 if (opt->code == OPT_imacros
1454 && cpp_push_include (parse_in, opt->arg))
1456 /* Disable push_command_line_include callback for now. */
1457 include_cursor = deferred_count + 1;
1458 cpp_scan_nooutput (parse_in);
1462 else if (cpp_opts->directives_only)
1463 cpp_init_special_builtins (parse_in);
1466 push_command_line_include ();
1469 /* Give CPP the next file given by -include, if any. */
1471 push_command_line_include (void)
1473 while (include_cursor < deferred_count)
1475 struct deferred_opt *opt = &deferred_opts[include_cursor++];
1477 if (!cpp_opts->preprocessed && opt->code == OPT_include
1478 && cpp_push_include (parse_in, opt->arg))
1482 if (include_cursor == deferred_count)
1485 /* -Wunused-macros should only warn about macros defined hereafter. */
1486 cpp_opts->warn_unused_macros = warn_unused_macros;
1487 /* Restore the line map from <command line>. */
1488 if (!cpp_opts->preprocessed)
1489 cpp_change_file (parse_in, LC_RENAME, this_input_filename);
1491 /* Set this here so the client can change the option if it wishes,
1492 and after stacking the main file so we don't trace the main file. */
1493 line_table.trace_includes = cpp_opts->print_include_names;
1497 /* File change callback. Has to handle -include files. */
1499 cb_file_change (cpp_reader * ARG_UNUSED (pfile),
1500 const struct line_map *new_map)
1502 if (flag_preprocess_only)
1503 pp_file_change (new_map);
1505 fe_file_change (new_map);
1507 if (new_map == 0 || (new_map->reason == LC_LEAVE && MAIN_FILE_P (new_map)))
1508 push_command_line_include ();
1512 cb_dir_change (cpp_reader * ARG_UNUSED (pfile), const char *dir)
1514 if (!set_src_pwd (dir))
1515 warning (0, "too late for # directive to set debug directory");
1518 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1519 extensions if ISO). There is no concept of gnu94. */
1521 set_std_c89 (int c94, int iso)
1523 cpp_set_lang (parse_in, c94 ? CLK_STDC94: iso ? CLK_STDC89: CLK_GNUC89);
1526 flag_no_gnu_keywords = iso;
1527 flag_no_nonansi_builtin = iso;
1532 /* Set the C 99 standard (without GNU extensions if ISO). */
1534 set_std_c99 (int iso)
1536 cpp_set_lang (parse_in, iso ? CLK_STDC99: CLK_GNUC99);
1538 flag_no_nonansi_builtin = iso;
1544 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1546 set_std_cxx98 (int iso)
1548 cpp_set_lang (parse_in, iso ? CLK_CXX98: CLK_GNUCXX);
1549 flag_no_gnu_keywords = iso;
1550 flag_no_nonansi_builtin = iso;
1554 /* Handle setting implicit to ON. */
1556 set_Wimplicit (int on)
1559 warn_implicit_int = on;
1562 if (mesg_implicit_function_declaration != 2)
1563 mesg_implicit_function_declaration = 1;
1566 mesg_implicit_function_declaration = 0;
1569 /* Args to -d specify what to dump. Silently ignore
1570 unrecognized options; they may be aimed at toplev.c. */
1572 handle_OPT_d (const char *arg)
1576 while ((c = *arg++) != '\0')
1579 case 'M': /* Dump macros only. */
1580 case 'N': /* Dump names. */
1581 case 'D': /* Dump definitions. */
1582 flag_dump_macros = c;
1586 flag_dump_includes = 1;