1 /* C/ObjC/C++ command line option handling.
2 Copyright (C) 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
3 Contributed by Neil Booth.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
24 #include "coretypes.h"
31 #include "langhooks.h"
32 #include "tree-inline.h"
33 #include "diagnostic.h"
35 #include "cppdefault.h"
36 #include "c-incpath.h"
37 #include "debug.h" /* For debug_hooks. */
42 #ifndef DOLLARS_IN_IDENTIFIERS
43 # define DOLLARS_IN_IDENTIFIERS true
46 #ifndef TARGET_SYSTEM_ROOT
47 # define TARGET_SYSTEM_ROOT NULL
51 #define TARGET_OPTF(ARG)
55 static cpp_options
*cpp_opts
;
58 static const char *this_input_filename
;
60 /* Filename and stream for preprocessed output. */
61 static const char *out_fname
;
62 static FILE *out_stream
;
64 /* Append dependencies to deps_file. */
65 static bool deps_append
;
67 /* If dependency switches (-MF etc.) have been given. */
68 static bool deps_seen
;
73 /* If -lang-fortran seen. */
74 static bool lang_fortran
= false;
76 /* Dependency output file. */
77 static const char *deps_file
;
79 /* The prefix given by -iprefix, if any. */
80 static const char *iprefix
;
82 /* The multilib directory given by -imultilib, if any. */
83 static const char *imultilib
;
85 /* The system root, if any. Overridden by -isysroot. */
86 static const char *sysroot
= TARGET_SYSTEM_ROOT
;
88 /* Zero disables all standard directories for headers. */
89 static bool std_inc
= true;
91 /* Zero disables the C++-specific standard directories for headers. */
92 static bool std_cxx_inc
= true;
94 /* If the quote chain has been split by -I-. */
95 static bool quote_chain_split
;
97 /* If -Wunused-macros. */
98 static bool warn_unused_macros
;
100 /* If -Wvariadic-macros. */
101 static bool warn_variadic_macros
= true;
103 /* Number of deferred options. */
104 static size_t deferred_count
;
106 /* Number of deferred options scanned for -include. */
107 static size_t include_cursor
;
109 static void set_Wimplicit (int);
110 static void handle_OPT_d (const char *);
111 static void set_std_cxx98 (int);
112 static void set_std_c89 (int, int);
113 static void set_std_c99 (int);
114 static void check_deps_environment_vars (void);
115 static void handle_deferred_opts (void);
116 static void sanitize_cpp_opts (void);
117 static void add_prefixed_path (const char *, size_t);
118 static void push_command_line_include (void);
119 static void cb_file_change (cpp_reader
*, const struct line_map
*);
120 static void cb_dir_change (cpp_reader
*, const char *);
121 static void finish_options (void);
123 #ifndef STDC_0_IN_SYSTEM_HEADERS
124 #define STDC_0_IN_SYSTEM_HEADERS 0
127 /* Holds switches parsed by c_common_handle_option (), but whose
128 handling is deferred to c_common_post_options (). */
129 static void defer_opt (enum opt_code
, const char *);
130 static struct deferred_opt
136 /* Complain that switch CODE expects an argument but none was
137 provided. OPT was the command-line option. Return FALSE to get
138 the default message in opts.c, TRUE if we provide a specialized
141 c_common_missing_argument (const char *opt
, size_t code
)
146 /* Pick up the default message. */
149 case OPT_fconstant_string_class_
:
150 error ("no class name specified with %qs", opt
);
154 error ("assertion missing after %qs", opt
);
159 error ("macro name missing after %qs", opt
);
168 error ("missing path after %qs", opt
);
177 error ("missing filename after %qs", opt
);
182 error ("missing makefile target after %qs", opt
);
189 /* Defer option CODE with argument ARG. */
191 defer_opt (enum opt_code code
, const char *arg
)
193 deferred_opts
[deferred_count
].code
= code
;
194 deferred_opts
[deferred_count
].arg
= arg
;
198 /* Common initialization before parsing options. */
200 c_common_init_options (unsigned int argc
, const char **argv
)
202 static const unsigned int lang_flags
[] = {CL_C
, CL_ObjC
, CL_CXX
, CL_ObjCXX
};
203 unsigned int i
, result
;
205 /* This is conditionalized only because that is the way the front
206 ends used to do it. Maybe this should be unconditional? */
207 if (c_dialect_cxx ())
209 /* By default wrap lines at 80 characters. Is getenv
210 ("COLUMNS") preferable? */
211 diagnostic_line_cutoff (global_dc
) = 80;
212 /* By default, emit location information once for every
213 diagnostic message. */
214 diagnostic_prefixing_rule (global_dc
) = DIAGNOSTICS_SHOW_PREFIX_ONCE
;
217 parse_in
= cpp_create_reader (c_dialect_cxx () ? CLK_GNUCXX
: CLK_GNUC89
,
218 ident_hash
, &line_table
);
220 cpp_opts
= cpp_get_options (parse_in
);
221 cpp_opts
->dollars_in_ident
= DOLLARS_IN_IDENTIFIERS
;
222 cpp_opts
->objc
= c_dialect_objc ();
224 /* Reset to avoid warnings on internal definitions. We set it just
225 before passing on command-line options to cpplib. */
226 cpp_opts
->warn_dollars
= 0;
228 flag_const_strings
= c_dialect_cxx ();
229 flag_exceptions
= c_dialect_cxx ();
230 warn_pointer_arith
= c_dialect_cxx ();
232 deferred_opts
= XNEWVEC (struct deferred_opt
, argc
);
234 result
= lang_flags
[c_language
];
236 if (c_language
== clk_c
)
238 /* If preprocessing assembly language, accept any of the C-family
239 front end options since the driver may pass them through. */
240 for (i
= 1; i
< argc
; i
++)
241 if (! strcmp (argv
[i
], "-lang-asm"))
243 result
|= CL_C
| CL_ObjC
| CL_CXX
| CL_ObjCXX
;
248 for (i
= 1; i
< argc
; i
++)
249 if (! strcmp (argv
[i
], "-lang-fortran"))
251 result
|= CL_Fortran
;
260 /* Handle switch SCODE with argument ARG. VALUE is true, unless no-
261 form of an -f or -W option was given. Returns 0 if the switch was
262 invalid, a negative number to prevent language-independent
263 processing in toplev.c (a hack necessary for the short-term). */
265 c_common_handle_option (size_t scode
, const char *arg
, int value
)
267 const struct cl_option
*option
= &cl_options
[scode
];
268 enum opt_code code
= (enum opt_code
) scode
;
274 if (cl_options
[code
].flags
& (CL_C
| CL_CXX
| CL_ObjC
| CL_ObjCXX
))
277 if (lang_fortran
&& (cl_options
[code
].flags
& (CL_Fortran
)))
283 case OPT__output_pch_
:
288 defer_opt (code
, arg
);
292 cpp_opts
->discard_comments
= 0;
296 cpp_opts
->discard_comments
= 0;
297 cpp_opts
->discard_comments_in_macro_exp
= 0;
301 defer_opt (code
, arg
);
305 flag_preprocess_only
= 1;
309 cpp_opts
->print_include_names
= 1;
313 TARGET_OPTF (xstrdup (arg
));
317 if (strcmp (arg
, "-"))
318 add_path (xstrdup (arg
), BRACKET
, 0, true);
321 if (quote_chain_split
)
322 error ("-I- specified twice");
323 quote_chain_split
= true;
324 split_quote_chain ();
325 inform ("obsolete option -I- used, please use -iquote instead");
331 /* When doing dependencies with -M or -MM, suppress normal
332 preprocessed output, but still do -dM etc. as software
333 depends on this. Preprocessed output does occur if -MD, -MMD
334 or environment var dependency generation is used. */
335 cpp_opts
->deps
.style
= (code
== OPT_M
? DEPS_SYSTEM
: DEPS_USER
);
337 cpp_opts
->inhibit_warnings
= 1;
342 cpp_opts
->deps
.style
= (code
== OPT_MD
? DEPS_SYSTEM
: DEPS_USER
);
353 cpp_opts
->deps
.missing_files
= true;
358 cpp_opts
->deps
.phony_targets
= true;
364 defer_opt (code
, arg
);
368 flag_no_line_commands
= 1;
371 case OPT_fworking_directory
:
372 flag_working_directory
= value
;
376 defer_opt (code
, arg
);
382 set_Wimplicit (value
);
383 warn_char_subscripts
= value
;
384 warn_missing_braces
= value
;
385 warn_parentheses
= value
;
386 warn_return_type
= value
;
387 warn_sequence_point
= value
; /* Was C only. */
388 if (c_dialect_cxx ())
389 warn_sign_compare
= value
;
391 warn_strict_aliasing
= value
;
392 warn_string_literal_comparison
= value
;
393 warn_always_true
= value
;
395 /* Only warn about unknown pragmas that are not in system
397 warn_unknown_pragmas
= value
;
399 /* We save the value of warn_uninitialized, since if they put
400 -Wuninitialized on the command line, we need to generate a
401 warning about not using it without also specifying -O. */
402 if (warn_uninitialized
!= 1)
403 warn_uninitialized
= (value
? 2 : 0);
405 if (!c_dialect_cxx ())
406 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding
407 can turn it off only if it's not explicit. */
408 warn_main
= value
* 2;
411 /* C++-specific warnings. */
412 warn_reorder
= value
;
413 warn_nontemplate_friend
= value
;
416 cpp_opts
->warn_trigraphs
= value
;
417 cpp_opts
->warn_comments
= value
;
418 cpp_opts
->warn_num_sign_change
= value
;
419 cpp_opts
->warn_multichar
= value
; /* Was C++ only. */
421 if (warn_pointer_sign
== -1)
422 warn_pointer_sign
= 1;
427 cpp_opts
->warn_comments
= value
;
430 case OPT_Wdeprecated
:
431 cpp_opts
->warn_deprecated
= value
;
434 case OPT_Wendif_labels
:
435 cpp_opts
->warn_endif_labels
= value
;
439 cpp_opts
->warnings_are_errors
= value
;
440 global_dc
->warning_as_error_requested
= value
;
443 case OPT_Werror_implicit_function_declaration
:
444 mesg_implicit_function_declaration
= 2;
452 set_Wformat (atoi (arg
));
456 set_Wimplicit (value
);
460 /* Silently ignore for now. */
463 case OPT_Winvalid_pch
:
464 cpp_opts
->warn_invalid_pch
= value
;
474 case OPT_Wmissing_include_dirs
:
475 cpp_opts
->warn_missing_include_dirs
= value
;
479 cpp_opts
->warn_multichar
= value
;
482 case OPT_Wnormalized_
:
483 if (!value
|| (arg
&& strcasecmp (arg
, "none") == 0))
484 cpp_opts
->warn_normalize
= normalized_none
;
485 else if (!arg
|| strcasecmp (arg
, "nfkc") == 0)
486 cpp_opts
->warn_normalize
= normalized_KC
;
487 else if (strcasecmp (arg
, "id") == 0)
488 cpp_opts
->warn_normalize
= normalized_identifier_C
;
489 else if (strcasecmp (arg
, "nfc") == 0)
490 cpp_opts
->warn_normalize
= normalized_C
;
492 error ("argument %qs to %<-Wnormalized%> not recognized", arg
);
495 case OPT_Wreturn_type
:
496 warn_return_type
= value
;
499 case OPT_Wstrict_null_sentinel
:
500 warn_strict_null_sentinel
= value
;
503 case OPT_Wsystem_headers
:
504 cpp_opts
->warn_system_headers
= value
;
507 case OPT_Wtraditional
:
508 cpp_opts
->warn_traditional
= value
;
512 cpp_opts
->warn_trigraphs
= value
;
516 cpp_opts
->warn_undef
= value
;
519 case OPT_Wunknown_pragmas
:
520 /* Set to greater than 1, so that even unknown pragmas in
521 system headers will be warned about. */
522 warn_unknown_pragmas
= value
* 2;
525 case OPT_Wunused_macros
:
526 warn_unused_macros
= value
;
529 case OPT_Wvariadic_macros
:
530 warn_variadic_macros
= value
;
533 case OPT_Wwrite_strings
:
534 if (!c_dialect_cxx ())
535 flag_const_strings
= value
;
537 warn_write_strings
= value
;
543 warn_nonvdtor
= true;
547 if (!c_dialect_cxx ())
548 set_std_c89 (false, true);
550 set_std_cxx98 (true);
557 case OPT_fcond_mismatch
:
558 if (!c_dialect_cxx ())
560 flag_cond_mismatch
= value
;
565 case OPT_fall_virtual
:
566 case OPT_falt_external_templates
:
567 case OPT_fenum_int_equiv
:
568 case OPT_fexternal_templates
:
569 case OPT_fguiding_decls
:
571 case OPT_fhuge_objects
:
573 case OPT_fname_mangling_version_
:
575 case OPT_fnonnull_objects
:
577 case OPT_fstrict_prototype
:
578 case OPT_fthis_is_variable
:
579 case OPT_fvtable_thunks
:
582 warning (0, "switch %qs is no longer supported", option
->opt_text
);
585 case OPT_faccess_control
:
586 flag_access_control
= value
;
590 flag_no_asm
= !value
;
594 flag_no_builtin
= !value
;
601 disable_builtin_function (arg
);
604 case OPT_fdollars_in_identifiers
:
605 cpp_opts
->dollars_in_ident
= value
;
608 case OPT_ffreestanding
:
610 /* Fall through.... */
613 flag_no_builtin
= !value
;
614 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
615 if (!value
&& warn_main
== 2)
619 case OPT_fshort_double
:
620 flag_short_double
= value
;
623 case OPT_fshort_enums
:
624 flag_short_enums
= value
;
627 case OPT_fshort_wchar
:
628 flag_short_wchar
= value
;
631 case OPT_fsigned_bitfields
:
632 flag_signed_bitfields
= value
;
635 case OPT_fsigned_char
:
636 flag_signed_char
= value
;
639 case OPT_funsigned_bitfields
:
640 flag_signed_bitfields
= !value
;
643 case OPT_funsigned_char
:
644 flag_signed_char
= !value
;
648 flag_check_new
= value
;
651 case OPT_fconserve_space
:
652 flag_conserve_space
= value
;
655 case OPT_fconst_strings
:
656 flag_const_strings
= value
;
659 case OPT_fconstant_string_class_
:
660 constant_string_class_name
= arg
;
663 case OPT_fdefault_inline
:
664 flag_default_inline
= value
;
667 case OPT_felide_constructors
:
668 flag_elide_constructors
= value
;
671 case OPT_fenforce_eh_specs
:
672 flag_enforce_eh_specs
= value
;
675 case OPT_fextended_identifiers
:
676 cpp_opts
->extended_identifiers
= value
;
680 flag_new_for_scope
= value
;
683 case OPT_fgnu_keywords
:
684 flag_no_gnu_keywords
= !value
;
687 case OPT_fgnu_runtime
:
688 flag_next_runtime
= !value
;
691 case OPT_fhandle_exceptions
:
692 warning (0, "-fhandle-exceptions has been renamed -fexceptions (and is now on by default)");
693 flag_exceptions
= value
;
696 case OPT_fimplement_inlines
:
697 flag_implement_inlines
= value
;
700 case OPT_fimplicit_inline_templates
:
701 flag_implicit_inline_templates
= value
;
704 case OPT_fimplicit_templates
:
705 flag_implicit_templates
= value
;
708 case OPT_fms_extensions
:
709 flag_ms_extensions
= value
;
712 case OPT_fnext_runtime
:
713 flag_next_runtime
= value
;
716 case OPT_fnil_receivers
:
717 flag_nil_receivers
= value
;
720 case OPT_fnonansi_builtins
:
721 flag_no_nonansi_builtin
= !value
;
724 case OPT_foperator_names
:
725 cpp_opts
->operator_names
= value
;
728 case OPT_foptional_diags
:
729 flag_optional_diags
= value
;
733 cpp_opts
->restore_pch_deps
= value
;
736 case OPT_fpch_preprocess
:
737 flag_pch_preprocess
= value
;
740 case OPT_fpermissive
:
741 flag_permissive
= value
;
744 case OPT_fpreprocessed
:
745 cpp_opts
->preprocessed
= value
;
748 case OPT_freplace_objc_classes
:
749 flag_replace_objc_classes
= value
;
753 flag_use_repository
= value
;
755 flag_implicit_templates
= 0;
762 case OPT_fshow_column
:
763 cpp_opts
->show_column
= value
;
767 flag_detailed_statistics
= value
;
771 /* It is documented that we silently ignore silly values. */
772 if (value
>= 1 && value
<= 100)
773 cpp_opts
->tabstop
= value
;
776 case OPT_fexec_charset_
:
777 cpp_opts
->narrow_charset
= arg
;
780 case OPT_fwide_exec_charset_
:
781 cpp_opts
->wide_charset
= arg
;
784 case OPT_finput_charset_
:
785 cpp_opts
->input_charset
= arg
;
788 case OPT_ftemplate_depth_
:
789 max_tinst_depth
= value
;
792 case OPT_fuse_cxa_atexit
:
793 flag_use_cxa_atexit
= value
;
796 case OPT_fvisibility_inlines_hidden
:
797 visibility_options
.inlines_hidden
= value
;
804 case OPT_fthreadsafe_statics
:
805 flag_threadsafe_statics
= value
;
809 flag_zero_link
= value
;
813 flag_gen_declaration
= 1;
817 add_path (xstrdup (arg
), AFTER
, 0, true);
822 defer_opt (code
, arg
);
834 add_path (xstrdup (arg
), QUOTE
, 0, true);
842 add_path (xstrdup (arg
), SYSTEM
, 0, true);
845 case OPT_iwithprefix
:
846 add_prefixed_path (arg
, SYSTEM
);
849 case OPT_iwithprefixbefore
:
850 add_prefixed_path (arg
, BRACKET
);
854 cpp_set_lang (parse_in
, CLK_ASM
);
855 cpp_opts
->dollars_in_ident
= false;
858 case OPT_lang_fortran
:
878 error ("output filename specified twice");
881 /* We need to handle the -pedantic switches here, rather than in
882 c_common_post_options, so that a subsequent -Wno-endif-labels
883 is not overridden. */
884 case OPT_pedantic_errors
:
885 cpp_opts
->pedantic_errors
= 1;
888 cpp_opts
->pedantic
= 1;
889 cpp_opts
->warn_endif_labels
= 1;
890 if (warn_pointer_sign
== -1)
891 warn_pointer_sign
= 1;
892 if (warn_overlength_strings
== -1)
893 warn_overlength_strings
= 1;
896 case OPT_print_objc_runtime_info
:
897 print_struct_values
= 1;
900 case OPT_print_pch_checksum
:
901 c_common_print_pch_checksum (stdout
);
902 exit_after_options
= true;
910 case OPT_std_gnu__98
:
911 set_std_cxx98 (code
== OPT_std_c__98
/* ISO */);
915 case OPT_std_iso9899_1990
:
916 case OPT_std_iso9899_199409
:
917 set_std_c89 (code
== OPT_std_iso9899_199409
/* c94 */, true /* ISO */);
921 set_std_c89 (false /* c94 */, false /* ISO */);
926 case OPT_std_iso9899_1999
:
927 case OPT_std_iso9899_199x
:
928 set_std_c99 (true /* ISO */);
933 set_std_c99 (false /* ISO */);
937 cpp_opts
->trigraphs
= 1;
940 case OPT_traditional_cpp
:
941 cpp_opts
->traditional
= 1;
949 cpp_opts
->inhibit_warnings
= 1;
960 /* Post-switch processing. */
962 c_common_post_options (const char **pfilename
)
964 struct cpp_callbacks
*cb
;
966 /* Canonicalize the input and output filenames. */
967 if (in_fnames
== NULL
)
969 in_fnames
= XNEWVEC (const char *, 1);
972 else if (strcmp (in_fnames
[0], "-") == 0)
975 if (out_fname
== NULL
|| !strcmp (out_fname
, "-"))
978 if (cpp_opts
->deps
.style
== DEPS_NONE
)
979 check_deps_environment_vars ();
981 handle_deferred_opts ();
983 sanitize_cpp_opts ();
985 register_include_chains (parse_in
, sysroot
, iprefix
, imultilib
,
986 std_inc
, std_cxx_inc
&& c_dialect_cxx (), verbose
);
988 flag_inline_trees
= 1;
990 /* Use tree inlining. */
993 if (flag_inline_functions
)
994 flag_inline_trees
= 2;
996 /* If we are given more than one input file, we must use
997 unit-at-a-time mode. */
998 if (num_in_fnames
> 1)
999 flag_unit_at_a_time
= 1;
1001 /* Default to ObjC sjlj exception handling if NeXT runtime. */
1002 if (flag_objc_sjlj_exceptions
< 0)
1003 flag_objc_sjlj_exceptions
= flag_next_runtime
;
1004 if (flag_objc_exceptions
&& !flag_objc_sjlj_exceptions
)
1005 flag_exceptions
= 1;
1007 /* -Wextra implies -Wsign-compare and -Wmissing-field-initializers,
1008 but not if explicitly overridden. */
1009 if (warn_sign_compare
== -1)
1010 warn_sign_compare
= extra_warnings
;
1011 if (warn_missing_field_initializers
== -1)
1012 warn_missing_field_initializers
= extra_warnings
;
1014 /* -Wpointer_sign is disabled by default, but it is enabled if any
1015 of -Wall or -pedantic are given. */
1016 if (warn_pointer_sign
== -1)
1017 warn_pointer_sign
= 0;
1019 /* -Woverlength-strings is off by default, but is enabled by -pedantic.
1020 It is never enabled in C++, as the minimum limit is not normative
1021 in that standard. */
1022 if (warn_overlength_strings
== -1 || c_dialect_cxx ())
1023 warn_overlength_strings
= 0;
1025 /* Special format checking options don't work without -Wformat; warn if
1029 warning (OPT_Wformat_y2k
,
1030 "-Wformat-y2k ignored without -Wformat");
1031 warning (OPT_Wformat_extra_args
,
1032 "-Wformat-extra-args ignored without -Wformat");
1033 warning (OPT_Wformat_zero_length
,
1034 "-Wformat-zero-length ignored without -Wformat");
1035 warning (OPT_Wformat_nonliteral
,
1036 "-Wformat-nonliteral ignored without -Wformat");
1037 warning (OPT_Wformat_security
,
1038 "-Wformat-security ignored without -Wformat");
1041 /* C99 requires special handling of complex multiplication and division;
1042 -ffast-math and -fcx-limited-range are handled in process_options. */
1044 flag_complex_method
= 2;
1046 if (flag_preprocess_only
)
1048 /* Open the output now. We must do so even if flag_no_output is
1049 on, because there may be other output than from the actual
1050 preprocessing (e.g. from -dM). */
1051 if (out_fname
[0] == '\0')
1052 out_stream
= stdout
;
1054 out_stream
= fopen (out_fname
, "w");
1056 if (out_stream
== NULL
)
1058 fatal_error ("opening output file %s: %m", out_fname
);
1062 if (num_in_fnames
> 1)
1063 error ("too many filenames given. Type %s --help for usage",
1066 init_pp_output (out_stream
);
1072 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1073 input_location
= UNKNOWN_LOCATION
;
1076 cb
= cpp_get_callbacks (parse_in
);
1077 cb
->file_change
= cb_file_change
;
1078 cb
->dir_change
= cb_dir_change
;
1079 cpp_post_options (parse_in
);
1081 input_location
= UNKNOWN_LOCATION
;
1083 /* If an error has occurred in cpplib, note it so we fail
1085 errorcount
+= cpp_errors (parse_in
);
1087 *pfilename
= this_input_filename
1088 = cpp_read_main_file (parse_in
, in_fnames
[0]);
1089 /* Don't do any compilation or preprocessing if there is no input file. */
1090 if (this_input_filename
== NULL
)
1096 if (flag_working_directory
1097 && flag_preprocess_only
&& !flag_no_line_commands
)
1098 pp_dir_change (parse_in
, get_src_pwd ());
1100 return flag_preprocess_only
;
1103 /* Front end initialization common to C, ObjC and C++. */
1105 c_common_init (void)
1107 /* Set up preprocessor arithmetic. Must be done after call to
1108 c_common_nodes_and_builtins for type nodes to be good. */
1109 cpp_opts
->precision
= TYPE_PRECISION (intmax_type_node
);
1110 cpp_opts
->char_precision
= TYPE_PRECISION (char_type_node
);
1111 cpp_opts
->int_precision
= TYPE_PRECISION (integer_type_node
);
1112 cpp_opts
->wchar_precision
= TYPE_PRECISION (wchar_type_node
);
1113 cpp_opts
->unsigned_wchar
= TYPE_UNSIGNED (wchar_type_node
);
1114 cpp_opts
->bytes_big_endian
= BYTES_BIG_ENDIAN
;
1116 /* This can't happen until after wchar_precision and bytes_big_endian
1118 cpp_init_iconv (parse_in
);
1121 c_common_print_pch_checksum (stderr
);
1123 if (flag_preprocess_only
)
1126 preprocess_file (parse_in
);
1130 /* Has to wait until now so that cpplib has its hash table. */
1136 /* Initialize the integrated preprocessor after debug output has been
1137 initialized; loop over each input file. */
1139 c_common_parse_file (int set_yydebug
)
1143 /* Enable parser debugging, if requested and we can. If requested
1144 and we can't, notify the user. */
1146 yydebug
= set_yydebug
;
1149 warning (0, "YYDEBUG was not defined at build time, -dy ignored");
1155 /* Start the main input file, if the debug writer wants it. */
1156 if (debug_hooks
->start_end_main_source_file
)
1157 (*debug_hooks
->start_source_file
) (0, this_input_filename
);
1164 /* And end the main input file, if the debug writer wants it */
1165 if (debug_hooks
->start_end_main_source_file
)
1166 (*debug_hooks
->end_source_file
) (0);
1167 if (++i
>= num_in_fnames
)
1169 cpp_undef_all (parse_in
);
1171 = cpp_read_main_file (parse_in
, in_fnames
[i
]);
1172 /* If an input file is missing, abandon further compilation.
1173 cpplib has issued a diagnostic. */
1174 if (!this_input_filename
)
1179 /* Common finish hook for the C, ObjC and C++ front ends. */
1181 c_common_finish (void)
1183 FILE *deps_stream
= NULL
;
1185 if (cpp_opts
->deps
.style
!= DEPS_NONE
)
1187 /* If -M or -MM was seen without -MF, default output to the
1190 deps_stream
= out_stream
;
1193 deps_stream
= fopen (deps_file
, deps_append
? "a": "w");
1195 fatal_error ("opening dependency file %s: %m", deps_file
);
1199 /* For performance, avoid tearing down cpplib's internal structures
1200 with cpp_destroy (). */
1201 errorcount
+= cpp_finish (parse_in
, deps_stream
);
1203 if (deps_stream
&& deps_stream
!= out_stream
1204 && (ferror (deps_stream
) || fclose (deps_stream
)))
1205 fatal_error ("closing dependency file %s: %m", deps_file
);
1207 if (out_stream
&& (ferror (out_stream
) || fclose (out_stream
)))
1208 fatal_error ("when writing output to %s: %m", out_fname
);
1211 /* Either of two environment variables can specify output of
1212 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1213 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1214 and DEPS_TARGET is the target to mention in the deps. They also
1215 result in dependency information being appended to the output file
1216 rather than overwriting it, and like Sun's compiler
1217 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1219 check_deps_environment_vars (void)
1223 GET_ENVIRONMENT (spec
, "DEPENDENCIES_OUTPUT");
1225 cpp_opts
->deps
.style
= DEPS_USER
;
1228 GET_ENVIRONMENT (spec
, "SUNPRO_DEPENDENCIES");
1231 cpp_opts
->deps
.style
= DEPS_SYSTEM
;
1232 cpp_opts
->deps
.ignore_main_file
= true;
1238 /* Find the space before the DEPS_TARGET, if there is one. */
1239 char *s
= strchr (spec
, ' ');
1242 /* Let the caller perform MAKE quoting. */
1243 defer_opt (OPT_MT
, s
+ 1);
1247 /* Command line -MF overrides environment variables and default. */
1256 /* Handle deferred command line switches. */
1258 handle_deferred_opts (void)
1263 /* Avoid allocating the deps buffer if we don't need it.
1264 (This flag may be true without there having been -MT or -MQ
1265 options, but we'll still need the deps buffer.) */
1269 deps
= cpp_get_deps (parse_in
);
1271 for (i
= 0; i
< deferred_count
; i
++)
1273 struct deferred_opt
*opt
= &deferred_opts
[i
];
1275 if (opt
->code
== OPT_MT
|| opt
->code
== OPT_MQ
)
1276 deps_add_target (deps
, opt
->arg
, opt
->code
== OPT_MQ
);
1280 /* These settings are appropriate for GCC, but not necessarily so for
1281 cpplib as a library. */
1283 sanitize_cpp_opts (void)
1285 /* If we don't know what style of dependencies to output, complain
1286 if any other dependency switches have been given. */
1287 if (deps_seen
&& cpp_opts
->deps
.style
== DEPS_NONE
)
1288 error ("to generate dependencies you must specify either -M or -MM");
1290 /* -dM and dependencies suppress normal output; do it here so that
1291 the last -d[MDN] switch overrides earlier ones. */
1292 if (flag_dump_macros
== 'M')
1295 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1296 -dM since at least glibc relies on -M -dM to work. */
1297 /* Also, flag_no_output implies flag_no_line_commands, always. */
1300 if (flag_dump_macros
!= 'M')
1301 flag_dump_macros
= 0;
1302 flag_dump_includes
= 0;
1303 flag_no_line_commands
= 1;
1306 cpp_opts
->unsigned_char
= !flag_signed_char
;
1307 cpp_opts
->stdc_0_in_system_headers
= STDC_0_IN_SYSTEM_HEADERS
;
1309 /* We want -Wno-long-long to override -pedantic -std=non-c99
1310 and/or -Wtraditional, whatever the ordering. */
1311 cpp_opts
->warn_long_long
1312 = warn_long_long
&& ((!flag_isoc99
&& pedantic
) || warn_traditional
);
1314 /* Similarly with -Wno-variadic-macros. No check for c99 here, since
1315 this also turns off warnings about GCCs extension. */
1316 cpp_opts
->warn_variadic_macros
1317 = warn_variadic_macros
&& (pedantic
|| warn_traditional
);
1319 /* If we're generating preprocessor output, emit current directory
1320 if explicitly requested or if debugging information is enabled.
1321 ??? Maybe we should only do it for debugging formats that
1322 actually output the current directory? */
1323 if (flag_working_directory
== -1)
1324 flag_working_directory
= (debug_info_level
!= DINFO_LEVEL_NONE
);
1327 /* Add include path with a prefix at the front of its name. */
1329 add_prefixed_path (const char *suffix
, size_t chain
)
1333 size_t prefix_len
, suffix_len
;
1335 suffix_len
= strlen (suffix
);
1336 prefix
= iprefix
? iprefix
: cpp_GCC_INCLUDE_DIR
;
1337 prefix_len
= iprefix
? strlen (iprefix
) : cpp_GCC_INCLUDE_DIR_len
;
1339 path
= (char *) xmalloc (prefix_len
+ suffix_len
+ 1);
1340 memcpy (path
, prefix
, prefix_len
);
1341 memcpy (path
+ prefix_len
, suffix
, suffix_len
);
1342 path
[prefix_len
+ suffix_len
] = '\0';
1344 add_path (path
, chain
, 0, false);
1347 /* Handle -D, -U, -A, -imacros, and the first -include. */
1349 finish_options (void)
1351 if (!cpp_opts
->preprocessed
)
1355 cb_file_change (parse_in
,
1356 linemap_add (&line_table
, LC_RENAME
, 0,
1357 _("<built-in>"), 0));
1359 cpp_init_builtins (parse_in
, flag_hosted
);
1360 c_cpp_builtins (parse_in
);
1362 /* We're about to send user input to cpplib, so make it warn for
1363 things that we previously (when we sent it internal definitions)
1364 told it to not warn.
1366 C99 permits implementation-defined characters in identifiers.
1367 The documented meaning of -std= is to turn off extensions that
1368 conflict with the specified standard, and since a strictly
1369 conforming program cannot contain a '$', we do not condition
1370 their acceptance on the -std= setting. */
1371 cpp_opts
->warn_dollars
= (cpp_opts
->pedantic
&& !cpp_opts
->c99
);
1373 cpp_change_file (parse_in
, LC_RENAME
, _("<command line>"));
1374 for (i
= 0; i
< deferred_count
; i
++)
1376 struct deferred_opt
*opt
= &deferred_opts
[i
];
1378 if (opt
->code
== OPT_D
)
1379 cpp_define (parse_in
, opt
->arg
);
1380 else if (opt
->code
== OPT_U
)
1381 cpp_undef (parse_in
, opt
->arg
);
1382 else if (opt
->code
== OPT_A
)
1384 if (opt
->arg
[0] == '-')
1385 cpp_unassert (parse_in
, opt
->arg
+ 1);
1387 cpp_assert (parse_in
, opt
->arg
);
1391 /* Handle -imacros after -D and -U. */
1392 for (i
= 0; i
< deferred_count
; i
++)
1394 struct deferred_opt
*opt
= &deferred_opts
[i
];
1396 if (opt
->code
== OPT_imacros
1397 && cpp_push_include (parse_in
, opt
->arg
))
1399 /* Disable push_command_line_include callback for now. */
1400 include_cursor
= deferred_count
+ 1;
1401 cpp_scan_nooutput (parse_in
);
1407 push_command_line_include ();
1410 /* Give CPP the next file given by -include, if any. */
1412 push_command_line_include (void)
1414 while (include_cursor
< deferred_count
)
1416 struct deferred_opt
*opt
= &deferred_opts
[include_cursor
++];
1418 if (!cpp_opts
->preprocessed
&& opt
->code
== OPT_include
1419 && cpp_push_include (parse_in
, opt
->arg
))
1423 if (include_cursor
== deferred_count
)
1426 /* -Wunused-macros should only warn about macros defined hereafter. */
1427 cpp_opts
->warn_unused_macros
= warn_unused_macros
;
1428 /* Restore the line map from <command line>. */
1429 if (!cpp_opts
->preprocessed
)
1430 cpp_change_file (parse_in
, LC_RENAME
, this_input_filename
);
1432 /* Set this here so the client can change the option if it wishes,
1433 and after stacking the main file so we don't trace the main file. */
1434 line_table
.trace_includes
= cpp_opts
->print_include_names
;
1438 /* File change callback. Has to handle -include files. */
1440 cb_file_change (cpp_reader
* ARG_UNUSED (pfile
),
1441 const struct line_map
*new_map
)
1443 if (flag_preprocess_only
)
1444 pp_file_change (new_map
);
1446 fe_file_change (new_map
);
1448 if (new_map
== 0 || (new_map
->reason
== LC_LEAVE
&& MAIN_FILE_P (new_map
)))
1449 push_command_line_include ();
1453 cb_dir_change (cpp_reader
* ARG_UNUSED (pfile
), const char *dir
)
1455 if (!set_src_pwd (dir
))
1456 warning (0, "too late for # directive to set debug directory");
1459 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1460 extensions if ISO). There is no concept of gnu94. */
1462 set_std_c89 (int c94
, int iso
)
1464 cpp_set_lang (parse_in
, c94
? CLK_STDC94
: iso
? CLK_STDC89
: CLK_GNUC89
);
1467 flag_no_gnu_keywords
= iso
;
1468 flag_no_nonansi_builtin
= iso
;
1473 /* Set the C 99 standard (without GNU extensions if ISO). */
1475 set_std_c99 (int iso
)
1477 cpp_set_lang (parse_in
, iso
? CLK_STDC99
: CLK_GNUC99
);
1479 flag_no_nonansi_builtin
= iso
;
1485 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1487 set_std_cxx98 (int iso
)
1489 cpp_set_lang (parse_in
, iso
? CLK_CXX98
: CLK_GNUCXX
);
1490 flag_no_gnu_keywords
= iso
;
1491 flag_no_nonansi_builtin
= iso
;
1495 /* Handle setting implicit to ON. */
1497 set_Wimplicit (int on
)
1500 warn_implicit_int
= on
;
1503 if (mesg_implicit_function_declaration
!= 2)
1504 mesg_implicit_function_declaration
= 1;
1507 mesg_implicit_function_declaration
= 0;
1510 /* Args to -d specify what to dump. Silently ignore
1511 unrecognized options; they may be aimed at toplev.c. */
1513 handle_OPT_d (const char *arg
)
1517 while ((c
= *arg
++) != '\0')
1520 case 'M': /* Dump macros only. */
1521 case 'N': /* Dump names. */
1522 case 'D': /* Dump definitions. */
1523 flag_dump_macros
= c
;
1527 flag_dump_includes
= 1;