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 /* APPLE LOCAL begin -Wnewline-eof */
491 case OPT_Wnewline_eof:
492 cpp_opts->warn_newline_at_eof = value;
494 /* APPLE LOCAL end -Wnewline-eof */
496 case OPT_Wnormalized_:
497 if (!value || (arg && strcasecmp (arg, "none") == 0))
498 cpp_opts->warn_normalize = normalized_none;
499 else if (!arg || strcasecmp (arg, "nfkc") == 0)
500 cpp_opts->warn_normalize = normalized_KC;
501 else if (strcasecmp (arg, "id") == 0)
502 cpp_opts->warn_normalize = normalized_identifier_C;
503 else if (strcasecmp (arg, "nfc") == 0)
504 cpp_opts->warn_normalize = normalized_C;
506 error ("argument %qs to %<-Wnormalized%> not recognized", arg);
509 case OPT_Wreturn_type:
510 warn_return_type = value;
513 case OPT_Wstrict_null_sentinel:
514 warn_strict_null_sentinel = value;
517 case OPT_Wsystem_headers:
518 cpp_opts->warn_system_headers = value;
521 case OPT_Wtraditional:
522 cpp_opts->warn_traditional = value;
526 cpp_opts->warn_trigraphs = value;
530 cpp_opts->warn_undef = value;
533 case OPT_Wunknown_pragmas:
534 /* Set to greater than 1, so that even unknown pragmas in
535 system headers will be warned about. */
536 warn_unknown_pragmas = value * 2;
539 case OPT_Wunused_macros:
540 warn_unused_macros = value;
543 case OPT_Wvariadic_macros:
544 warn_variadic_macros = value;
547 case OPT_Wwrite_strings:
548 warn_write_strings = value;
554 warn_nonvdtor = true;
558 if (!c_dialect_cxx ())
559 set_std_c89 (false, true);
561 set_std_cxx98 (true);
568 case OPT_fcond_mismatch:
569 if (!c_dialect_cxx ())
571 flag_cond_mismatch = value;
576 case OPT_fall_virtual:
577 case OPT_falt_external_templates:
578 case OPT_fenum_int_equiv:
579 case OPT_fexternal_templates:
580 case OPT_fguiding_decls:
582 case OPT_fhuge_objects:
584 case OPT_fname_mangling_version_:
586 case OPT_fnonnull_objects:
588 case OPT_fstrict_prototype:
589 case OPT_fthis_is_variable:
590 case OPT_fvtable_thunks:
593 warning (0, "switch %qs is no longer supported", option->opt_text);
596 case OPT_faccess_control:
597 flag_access_control = value;
601 flag_no_asm = !value;
605 flag_no_builtin = !value;
612 disable_builtin_function (arg);
615 case OPT_fdirectives_only:
616 cpp_opts->directives_only = 1;
619 case OPT_fdollars_in_identifiers:
620 cpp_opts->dollars_in_ident = value;
623 case OPT_ffreestanding:
625 /* Fall through.... */
628 flag_no_builtin = !value;
629 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
630 if (!value && warn_main == 2)
634 case OPT_fshort_double:
635 flag_short_double = value;
638 case OPT_fshort_enums:
639 flag_short_enums = value;
642 case OPT_fshort_wchar:
643 flag_short_wchar = value;
646 case OPT_fsigned_bitfields:
647 flag_signed_bitfields = value;
650 case OPT_fsigned_char:
651 flag_signed_char = value;
654 case OPT_funsigned_bitfields:
655 flag_signed_bitfields = !value;
658 case OPT_funsigned_char:
659 flag_signed_char = !value;
663 flag_check_new = value;
666 case OPT_fconserve_space:
667 flag_conserve_space = value;
670 case OPT_fconstant_string_class_:
671 constant_string_class_name = arg;
674 case OPT_fdefault_inline:
675 flag_default_inline = value;
678 case OPT_felide_constructors:
679 flag_elide_constructors = value;
682 case OPT_fenforce_eh_specs:
683 flag_enforce_eh_specs = value;
686 case OPT_fextended_identifiers:
687 cpp_opts->extended_identifiers = value;
691 flag_new_for_scope = value;
694 case OPT_fgnu_keywords:
695 flag_no_gnu_keywords = !value;
698 case OPT_fgnu_runtime:
699 flag_next_runtime = !value;
702 case OPT_fhandle_exceptions:
703 warning (0, "-fhandle-exceptions has been renamed -fexceptions (and is now on by default)");
704 flag_exceptions = value;
707 case OPT_fimplement_inlines:
708 flag_implement_inlines = value;
711 case OPT_fimplicit_inline_templates:
712 flag_implicit_inline_templates = value;
715 case OPT_fimplicit_templates:
716 flag_implicit_templates = value;
719 case OPT_flax_vector_conversions:
720 flag_lax_vector_conversions = value;
723 case OPT_fms_extensions:
724 flag_ms_extensions = value;
727 case OPT_fnext_runtime:
728 flag_next_runtime = value;
731 case OPT_fnil_receivers:
732 flag_nil_receivers = value;
735 case OPT_fnonansi_builtins:
736 flag_no_nonansi_builtin = !value;
739 case OPT_foperator_names:
740 cpp_opts->operator_names = value;
743 case OPT_foptional_diags:
744 flag_optional_diags = value;
748 cpp_opts->restore_pch_deps = value;
751 case OPT_fpch_preprocess:
752 flag_pch_preprocess = value;
755 case OPT_fpermissive:
756 flag_permissive = value;
759 case OPT_fpreprocessed:
760 cpp_opts->preprocessed = value;
763 case OPT_freplace_objc_classes:
764 flag_replace_objc_classes = value;
768 flag_use_repository = value;
770 flag_implicit_templates = 0;
777 case OPT_fshow_column:
778 cpp_opts->show_column = value;
782 flag_detailed_statistics = value;
786 /* It is documented that we silently ignore silly values. */
787 if (value >= 1 && value <= 100)
788 cpp_opts->tabstop = value;
791 case OPT_fexec_charset_:
792 cpp_opts->narrow_charset = arg;
795 case OPT_fwide_exec_charset_:
796 cpp_opts->wide_charset = arg;
799 case OPT_finput_charset_:
800 cpp_opts->input_charset = arg;
803 case OPT_ftemplate_depth_:
804 max_tinst_depth = value;
807 case OPT_fuse_cxa_atexit:
808 flag_use_cxa_atexit = value;
811 case OPT_fuse_cxa_get_exception_ptr:
812 flag_use_cxa_get_exception_ptr = value;
815 case OPT_fvisibility_inlines_hidden:
816 visibility_options.inlines_hidden = value;
823 case OPT_fthreadsafe_statics:
824 flag_threadsafe_statics = value;
828 flag_zero_link = value;
832 flag_gen_declaration = 1;
835 case OPT_femit_struct_debug_baseonly:
836 set_struct_debug_option ("base");
839 case OPT_femit_struct_debug_reduced:
840 set_struct_debug_option ("dir:ord:sys,dir:gen:any,ind:base");
843 case OPT_femit_struct_debug_detailed_:
844 set_struct_debug_option (arg);
848 add_path (xstrdup (arg), AFTER, 0, true);
853 defer_opt (code, arg);
865 add_path (xstrdup (arg), QUOTE, 0, true);
873 add_path (xstrdup (arg), SYSTEM, 0, true);
876 case OPT_iwithprefix:
877 add_prefixed_path (arg, SYSTEM);
880 case OPT_iwithprefixbefore:
881 add_prefixed_path (arg, BRACKET);
885 cpp_set_lang (parse_in, CLK_ASM);
886 cpp_opts->dollars_in_ident = false;
889 case OPT_lang_fortran:
909 error ("output filename specified twice");
912 /* We need to handle the -pedantic switches here, rather than in
913 c_common_post_options, so that a subsequent -Wno-endif-labels
914 is not overridden. */
915 case OPT_pedantic_errors:
916 cpp_opts->pedantic_errors = 1;
919 cpp_opts->pedantic = 1;
920 cpp_opts->warn_endif_labels = 1;
921 if (warn_pointer_sign == -1)
922 warn_pointer_sign = 1;
923 if (warn_overlength_strings == -1)
924 warn_overlength_strings = 1;
927 case OPT_print_objc_runtime_info:
928 print_struct_values = 1;
931 case OPT_print_pch_checksum:
932 c_common_print_pch_checksum (stdout);
933 exit_after_options = true;
941 case OPT_std_gnu__98:
942 if (!preprocessing_asm_p)
943 set_std_cxx98 (code == OPT_std_c__98 /* ISO */);
947 case OPT_std_iso9899_1990:
948 case OPT_std_iso9899_199409:
949 if (!preprocessing_asm_p)
950 set_std_c89 (code == OPT_std_iso9899_199409 /* c94 */, true /* ISO */);
954 if (!preprocessing_asm_p)
955 set_std_c89 (false /* c94 */, false /* ISO */);
960 case OPT_std_iso9899_1999:
961 case OPT_std_iso9899_199x:
962 if (!preprocessing_asm_p)
963 set_std_c99 (true /* ISO */);
968 if (!preprocessing_asm_p)
969 set_std_c99 (false /* ISO */);
973 cpp_opts->trigraphs = 1;
976 case OPT_traditional_cpp:
977 cpp_opts->traditional = 1;
985 cpp_opts->inhibit_warnings = 1;
996 /* Post-switch processing. */
998 c_common_post_options (const char **pfilename)
1000 struct cpp_callbacks *cb;
1002 /* Canonicalize the input and output filenames. */
1003 if (in_fnames == NULL)
1005 in_fnames = XNEWVEC (const char *, 1);
1008 else if (strcmp (in_fnames[0], "-") == 0)
1011 if (out_fname == NULL || !strcmp (out_fname, "-"))
1014 if (cpp_opts->deps.style == DEPS_NONE)
1015 check_deps_environment_vars ();
1017 handle_deferred_opts ();
1019 sanitize_cpp_opts ();
1021 register_include_chains (parse_in, sysroot, iprefix, imultilib,
1022 std_inc, std_cxx_inc && c_dialect_cxx (), verbose);
1024 #ifdef C_COMMON_OVERRIDE_OPTIONS
1025 /* Some machines may reject certain combinations of C
1026 language-specific options. */
1027 C_COMMON_OVERRIDE_OPTIONS;
1030 flag_inline_trees = 1;
1032 /* Use tree inlining. */
1033 if (!flag_no_inline)
1035 if (flag_inline_functions)
1036 flag_inline_trees = 2;
1038 /* By default we use C99 inline semantics in GNU99 or C99 mode. C99
1039 inline semantics are not supported in GNU89 or C89 mode. */
1040 if (flag_gnu89_inline == -1)
1041 flag_gnu89_inline = !flag_isoc99;
1042 else if (!flag_gnu89_inline && !flag_isoc99)
1043 error ("-fno-gnu89-inline is only supported in GNU99 or C99 mode");
1045 /* If we are given more than one input file, we must use
1046 unit-at-a-time mode. */
1047 if (num_in_fnames > 1)
1048 flag_unit_at_a_time = 1;
1050 /* Default to ObjC sjlj exception handling if NeXT runtime. */
1051 if (flag_objc_sjlj_exceptions < 0)
1052 flag_objc_sjlj_exceptions = flag_next_runtime;
1053 if (flag_objc_exceptions && !flag_objc_sjlj_exceptions)
1054 flag_exceptions = 1;
1056 /* -Wextra implies -Wsign-compare, -Wmissing-field-initializers and
1057 -Woverride-init, but not if explicitly overridden. */
1058 if (warn_sign_compare == -1)
1059 warn_sign_compare = extra_warnings;
1060 if (warn_missing_field_initializers == -1)
1061 warn_missing_field_initializers = extra_warnings;
1062 if (warn_override_init == -1)
1063 warn_override_init = extra_warnings;
1065 /* -Wpointer_sign is disabled by default, but it is enabled if any
1066 of -Wall or -pedantic are given. */
1067 if (warn_pointer_sign == -1)
1068 warn_pointer_sign = 0;
1070 /* -Woverlength-strings is off by default, but is enabled by -pedantic.
1071 It is never enabled in C++, as the minimum limit is not normative
1072 in that standard. */
1073 if (warn_overlength_strings == -1 || c_dialect_cxx ())
1074 warn_overlength_strings = 0;
1076 /* Special format checking options don't work without -Wformat; warn if
1080 warning (OPT_Wformat_y2k,
1081 "-Wformat-y2k ignored without -Wformat");
1082 warning (OPT_Wformat_extra_args,
1083 "-Wformat-extra-args ignored without -Wformat");
1084 warning (OPT_Wformat_zero_length,
1085 "-Wformat-zero-length ignored without -Wformat");
1086 warning (OPT_Wformat_nonliteral,
1087 "-Wformat-nonliteral ignored without -Wformat");
1088 warning (OPT_Wformat_security,
1089 "-Wformat-security ignored without -Wformat");
1092 /* C99 requires special handling of complex multiplication and division;
1093 -ffast-math and -fcx-limited-range are handled in process_options. */
1095 flag_complex_method = 2;
1097 if (flag_preprocess_only)
1099 /* Open the output now. We must do so even if flag_no_output is
1100 on, because there may be other output than from the actual
1101 preprocessing (e.g. from -dM). */
1102 if (out_fname[0] == '\0')
1103 out_stream = stdout;
1105 out_stream = fopen (out_fname, "w");
1107 if (out_stream == NULL)
1109 fatal_error ("opening output file %s: %m", out_fname);
1113 if (num_in_fnames > 1)
1114 error ("too many filenames given. Type %s --help for usage",
1117 init_pp_output (out_stream);
1123 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1124 input_location = UNKNOWN_LOCATION;
1127 cb = cpp_get_callbacks (parse_in);
1128 cb->file_change = cb_file_change;
1129 cb->dir_change = cb_dir_change;
1130 cpp_post_options (parse_in);
1132 input_location = UNKNOWN_LOCATION;
1134 /* If an error has occurred in cpplib, note it so we fail
1136 errorcount += cpp_errors (parse_in);
1138 *pfilename = this_input_filename
1139 = cpp_read_main_file (parse_in, in_fnames[0]);
1140 /* Don't do any compilation or preprocessing if there is no input file. */
1141 if (this_input_filename == NULL)
1147 if (flag_working_directory
1148 && flag_preprocess_only && !flag_no_line_commands)
1149 pp_dir_change (parse_in, get_src_pwd ());
1151 return flag_preprocess_only;
1154 /* Front end initialization common to C, ObjC and C++. */
1156 c_common_init (void)
1158 /* Set up preprocessor arithmetic. Must be done after call to
1159 c_common_nodes_and_builtins for type nodes to be good. */
1160 cpp_opts->precision = TYPE_PRECISION (intmax_type_node);
1161 cpp_opts->char_precision = TYPE_PRECISION (char_type_node);
1162 cpp_opts->int_precision = TYPE_PRECISION (integer_type_node);
1163 cpp_opts->wchar_precision = TYPE_PRECISION (wchar_type_node);
1164 cpp_opts->unsigned_wchar = TYPE_UNSIGNED (wchar_type_node);
1165 cpp_opts->bytes_big_endian = BYTES_BIG_ENDIAN;
1167 /* This can't happen until after wchar_precision and bytes_big_endian
1169 cpp_init_iconv (parse_in);
1172 c_common_print_pch_checksum (stderr);
1174 if (flag_preprocess_only)
1177 preprocess_file (parse_in);
1181 /* Has to wait until now so that cpplib has its hash table. */
1187 /* Initialize the integrated preprocessor after debug output has been
1188 initialized; loop over each input file. */
1190 c_common_parse_file (int set_yydebug)
1194 /* Enable parser debugging, if requested and we can. If requested
1195 and we can't, notify the user. */
1197 yydebug = set_yydebug;
1200 warning (0, "YYDEBUG was not defined at build time, -dy ignored");
1206 /* Start the main input file, if the debug writer wants it. */
1207 if (debug_hooks->start_end_main_source_file)
1208 (*debug_hooks->start_source_file) (0, this_input_filename);
1215 /* And end the main input file, if the debug writer wants it */
1216 if (debug_hooks->start_end_main_source_file)
1217 (*debug_hooks->end_source_file) (0);
1218 if (++i >= num_in_fnames)
1220 cpp_undef_all (parse_in);
1222 = cpp_read_main_file (parse_in, in_fnames[i]);
1223 /* If an input file is missing, abandon further compilation.
1224 cpplib has issued a diagnostic. */
1225 if (!this_input_filename)
1230 /* Common finish hook for the C, ObjC and C++ front ends. */
1232 c_common_finish (void)
1234 FILE *deps_stream = NULL;
1236 if (cpp_opts->deps.style != DEPS_NONE)
1238 /* If -M or -MM was seen without -MF, default output to the
1241 deps_stream = out_stream;
1244 deps_stream = fopen (deps_file, deps_append ? "a": "w");
1246 fatal_error ("opening dependency file %s: %m", deps_file);
1250 /* For performance, avoid tearing down cpplib's internal structures
1251 with cpp_destroy (). */
1252 errorcount += cpp_finish (parse_in, deps_stream);
1254 if (deps_stream && deps_stream != out_stream
1255 && (ferror (deps_stream) || fclose (deps_stream)))
1256 fatal_error ("closing dependency file %s: %m", deps_file);
1258 if (out_stream && (ferror (out_stream) || fclose (out_stream)))
1259 fatal_error ("when writing output to %s: %m", out_fname);
1262 /* Either of two environment variables can specify output of
1263 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1264 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1265 and DEPS_TARGET is the target to mention in the deps. They also
1266 result in dependency information being appended to the output file
1267 rather than overwriting it, and like Sun's compiler
1268 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1270 check_deps_environment_vars (void)
1274 GET_ENVIRONMENT (spec, "DEPENDENCIES_OUTPUT");
1276 cpp_opts->deps.style = DEPS_USER;
1279 GET_ENVIRONMENT (spec, "SUNPRO_DEPENDENCIES");
1282 cpp_opts->deps.style = DEPS_SYSTEM;
1283 cpp_opts->deps.ignore_main_file = true;
1289 /* Find the space before the DEPS_TARGET, if there is one. */
1290 char *s = strchr (spec, ' ');
1293 /* Let the caller perform MAKE quoting. */
1294 defer_opt (OPT_MT, s + 1);
1298 /* Command line -MF overrides environment variables and default. */
1307 /* Handle deferred command line switches. */
1309 handle_deferred_opts (void)
1314 /* Avoid allocating the deps buffer if we don't need it.
1315 (This flag may be true without there having been -MT or -MQ
1316 options, but we'll still need the deps buffer.) */
1320 deps = cpp_get_deps (parse_in);
1322 for (i = 0; i < deferred_count; i++)
1324 struct deferred_opt *opt = &deferred_opts[i];
1326 if (opt->code == OPT_MT || opt->code == OPT_MQ)
1327 deps_add_target (deps, opt->arg, opt->code == OPT_MQ);
1331 /* These settings are appropriate for GCC, but not necessarily so for
1332 cpplib as a library. */
1334 sanitize_cpp_opts (void)
1336 /* If we don't know what style of dependencies to output, complain
1337 if any other dependency switches have been given. */
1338 if (deps_seen && cpp_opts->deps.style == DEPS_NONE)
1339 error ("to generate dependencies you must specify either -M or -MM");
1341 /* -dM and dependencies suppress normal output; do it here so that
1342 the last -d[MDN] switch overrides earlier ones. */
1343 if (flag_dump_macros == 'M')
1346 /* By default, -fdirectives-only implies -dD. This allows subsequent phases
1347 to perform proper macro expansion. */
1348 if (cpp_opts->directives_only && !cpp_opts->preprocessed && !flag_dump_macros)
1349 flag_dump_macros = 'D';
1351 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1352 -dM since at least glibc relies on -M -dM to work. */
1353 /* Also, flag_no_output implies flag_no_line_commands, always. */
1356 if (flag_dump_macros != 'M')
1357 flag_dump_macros = 0;
1358 flag_dump_includes = 0;
1359 flag_no_line_commands = 1;
1362 cpp_opts->unsigned_char = !flag_signed_char;
1363 cpp_opts->stdc_0_in_system_headers = STDC_0_IN_SYSTEM_HEADERS;
1365 /* We want -Wno-long-long to override -pedantic -std=non-c99
1366 and/or -Wtraditional, whatever the ordering. */
1367 cpp_opts->warn_long_long
1368 = warn_long_long && ((!flag_isoc99 && pedantic) || warn_traditional);
1370 /* Similarly with -Wno-variadic-macros. No check for c99 here, since
1371 this also turns off warnings about GCCs extension. */
1372 cpp_opts->warn_variadic_macros
1373 = warn_variadic_macros && (pedantic || warn_traditional);
1375 /* If we're generating preprocessor output, emit current directory
1376 if explicitly requested or if debugging information is enabled.
1377 ??? Maybe we should only do it for debugging formats that
1378 actually output the current directory? */
1379 if (flag_working_directory == -1)
1380 flag_working_directory = (debug_info_level != DINFO_LEVEL_NONE);
1382 if (cpp_opts->directives_only)
1384 if (warn_unused_macros)
1385 error ("-fdirectives-only is incompatible with -Wunused_macros");
1386 if (cpp_opts->traditional)
1387 error ("-fdirectives-only is incompatible with -traditional");
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);
1472 else if (cpp_opts->directives_only)
1473 cpp_init_special_builtins (parse_in);
1476 push_command_line_include ();
1479 /* Give CPP the next file given by -include, if any. */
1481 push_command_line_include (void)
1483 while (include_cursor < deferred_count)
1485 struct deferred_opt *opt = &deferred_opts[include_cursor++];
1487 if (!cpp_opts->preprocessed && opt->code == OPT_include
1488 && cpp_push_include (parse_in, opt->arg))
1492 if (include_cursor == deferred_count)
1495 /* -Wunused-macros should only warn about macros defined hereafter. */
1496 cpp_opts->warn_unused_macros = warn_unused_macros;
1497 /* Restore the line map from <command line>. */
1498 if (!cpp_opts->preprocessed)
1499 cpp_change_file (parse_in, LC_RENAME, this_input_filename);
1501 /* Set this here so the client can change the option if it wishes,
1502 and after stacking the main file so we don't trace the main file. */
1503 line_table.trace_includes = cpp_opts->print_include_names;
1507 /* File change callback. Has to handle -include files. */
1509 cb_file_change (cpp_reader * ARG_UNUSED (pfile),
1510 const struct line_map *new_map)
1512 if (flag_preprocess_only)
1513 pp_file_change (new_map);
1515 fe_file_change (new_map);
1517 if (new_map == 0 || (new_map->reason == LC_LEAVE && MAIN_FILE_P (new_map)))
1518 push_command_line_include ();
1522 cb_dir_change (cpp_reader * ARG_UNUSED (pfile), const char *dir)
1524 if (!set_src_pwd (dir))
1525 warning (0, "too late for # directive to set debug directory");
1528 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1529 extensions if ISO). There is no concept of gnu94. */
1531 set_std_c89 (int c94, int iso)
1533 cpp_set_lang (parse_in, c94 ? CLK_STDC94: iso ? CLK_STDC89: CLK_GNUC89);
1536 flag_no_gnu_keywords = iso;
1537 flag_no_nonansi_builtin = iso;
1542 /* Set the C 99 standard (without GNU extensions if ISO). */
1544 set_std_c99 (int iso)
1546 cpp_set_lang (parse_in, iso ? CLK_STDC99: CLK_GNUC99);
1548 flag_no_nonansi_builtin = iso;
1554 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1556 set_std_cxx98 (int iso)
1558 cpp_set_lang (parse_in, iso ? CLK_CXX98: CLK_GNUCXX);
1559 flag_no_gnu_keywords = iso;
1560 flag_no_nonansi_builtin = iso;
1564 /* Handle setting implicit to ON. */
1566 set_Wimplicit (int on)
1569 warn_implicit_int = on;
1572 if (mesg_implicit_function_declaration != 2)
1573 mesg_implicit_function_declaration = 1;
1576 mesg_implicit_function_declaration = 0;
1579 /* Args to -d specify what to dump. Silently ignore
1580 unrecognized options; they may be aimed at toplev.c. */
1582 handle_OPT_d (const char *arg)
1586 while ((c = *arg++) != '\0')
1589 case 'M': /* Dump macros only. */
1590 case 'N': /* Dump names. */
1591 case 'D': /* Dump definitions. */
1592 flag_dump_macros = c;
1596 flag_dump_includes = 1;