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_cxx0x (int);
113 static void set_std_c89 (int, int);
114 static void set_std_c99 (int);
115 static void check_deps_environment_vars (void);
116 static void handle_deferred_opts (void);
117 static void sanitize_cpp_opts (void);
118 static void add_prefixed_path (const char *, size_t);
119 static void push_command_line_include (void);
120 static void cb_file_change (cpp_reader
*, const struct line_map
*);
121 static void cb_dir_change (cpp_reader
*, const char *);
122 static void finish_options (void);
124 #ifndef STDC_0_IN_SYSTEM_HEADERS
125 #define STDC_0_IN_SYSTEM_HEADERS 0
128 /* Holds switches parsed by c_common_handle_option (), but whose
129 handling is deferred to c_common_post_options (). */
130 static void defer_opt (enum opt_code
, const char *);
131 static struct deferred_opt
137 /* Complain that switch CODE expects an argument but none was
138 provided. OPT was the command-line option. Return FALSE to get
139 the default message in opts.c, TRUE if we provide a specialized
142 c_common_missing_argument (const char *opt
, size_t code
)
147 /* Pick up the default message. */
150 case OPT_fconstant_string_class_
:
151 error ("no class name specified with %qs", opt
);
155 error ("assertion missing after %qs", opt
);
160 error ("macro name missing after %qs", opt
);
169 error ("missing path after %qs", opt
);
178 error ("missing filename after %qs", opt
);
183 error ("missing makefile target after %qs", opt
);
190 /* Defer option CODE with argument ARG. */
192 defer_opt (enum opt_code code
, const char *arg
)
194 deferred_opts
[deferred_count
].code
= code
;
195 deferred_opts
[deferred_count
].arg
= arg
;
199 /* Common initialization before parsing options. */
201 c_common_init_options (unsigned int argc
, const char **argv
)
203 static const unsigned int lang_flags
[] = {CL_C
, CL_ObjC
, CL_CXX
, CL_ObjCXX
};
204 unsigned int i
, result
;
206 /* This is conditionalized only because that is the way the front
207 ends used to do it. Maybe this should be unconditional? */
208 if (c_dialect_cxx ())
210 /* By default wrap lines at 80 characters. Is getenv
211 ("COLUMNS") preferable? */
212 diagnostic_line_cutoff (global_dc
) = 80;
213 /* By default, emit location information once for every
214 diagnostic message. */
215 diagnostic_prefixing_rule (global_dc
) = DIAGNOSTICS_SHOW_PREFIX_ONCE
;
218 parse_in
= cpp_create_reader (c_dialect_cxx () ? CLK_GNUCXX
: CLK_GNUC89
,
219 ident_hash
, &line_table
);
221 cpp_opts
= cpp_get_options (parse_in
);
222 cpp_opts
->dollars_in_ident
= DOLLARS_IN_IDENTIFIERS
;
223 cpp_opts
->objc
= c_dialect_objc ();
225 /* Reset to avoid warnings on internal definitions. We set it just
226 before passing on command-line options to cpplib. */
227 cpp_opts
->warn_dollars
= 0;
229 flag_exceptions
= c_dialect_cxx ();
230 warn_pointer_arith
= c_dialect_cxx ();
231 warn_write_strings
= c_dialect_cxx();
233 deferred_opts
= XNEWVEC (struct deferred_opt
, argc
);
235 result
= lang_flags
[c_language
];
237 if (c_language
== clk_c
)
239 /* If preprocessing assembly language, accept any of the C-family
240 front end options since the driver may pass them through. */
241 for (i
= 1; i
< argc
; i
++)
242 if (! strcmp (argv
[i
], "-lang-asm"))
244 result
|= CL_C
| CL_ObjC
| CL_CXX
| CL_ObjCXX
;
249 for (i
= 1; i
< argc
; i
++)
250 if (! strcmp (argv
[i
], "-lang-fortran"))
252 result
|= CL_Fortran
;
261 /* Handle switch SCODE with argument ARG. VALUE is true, unless no-
262 form of an -f or -W option was given. Returns 0 if the switch was
263 invalid, a negative number to prevent language-independent
264 processing in toplev.c (a hack necessary for the short-term). */
266 c_common_handle_option (size_t scode
, const char *arg
, int value
)
268 const struct cl_option
*option
= &cl_options
[scode
];
269 enum opt_code code
= (enum opt_code
) scode
;
272 /* Prevent resetting the language standard to a C dialect when the driver
273 has already determined that we're looking at assembler input. */
274 bool preprocessing_asm_p
= (cpp_get_options (parse_in
)->lang
== CLK_ASM
);
279 if (cl_options
[code
].flags
& (CL_C
| CL_CXX
| CL_ObjC
| CL_ObjCXX
))
282 if (lang_fortran
&& (cl_options
[code
].flags
& (CL_Fortran
)))
288 case OPT__output_pch_
:
293 defer_opt (code
, arg
);
297 cpp_opts
->discard_comments
= 0;
301 cpp_opts
->discard_comments
= 0;
302 cpp_opts
->discard_comments_in_macro_exp
= 0;
306 defer_opt (code
, arg
);
310 flag_preprocess_only
= 1;
314 cpp_opts
->print_include_names
= 1;
318 TARGET_OPTF (xstrdup (arg
));
322 if (strcmp (arg
, "-"))
323 add_path (xstrdup (arg
), BRACKET
, 0, true);
326 if (quote_chain_split
)
327 error ("-I- specified twice");
328 quote_chain_split
= true;
329 split_quote_chain ();
330 inform ("obsolete option -I- used, please use -iquote instead");
336 /* When doing dependencies with -M or -MM, suppress normal
337 preprocessed output, but still do -dM etc. as software
338 depends on this. Preprocessed output does occur if -MD, -MMD
339 or environment var dependency generation is used. */
340 cpp_opts
->deps
.style
= (code
== OPT_M
? DEPS_SYSTEM
: DEPS_USER
);
342 cpp_opts
->inhibit_warnings
= 1;
347 cpp_opts
->deps
.style
= (code
== OPT_MD
? DEPS_SYSTEM
: DEPS_USER
);
358 cpp_opts
->deps
.missing_files
= true;
363 cpp_opts
->deps
.phony_targets
= true;
369 defer_opt (code
, arg
);
373 flag_no_line_commands
= 1;
376 case OPT_fworking_directory
:
377 flag_working_directory
= value
;
381 defer_opt (code
, arg
);
387 set_Wimplicit (value
);
388 warn_char_subscripts
= value
;
389 warn_missing_braces
= value
;
390 warn_parentheses
= value
;
391 warn_return_type
= value
;
392 warn_sequence_point
= value
; /* Was C only. */
393 if (c_dialect_cxx ())
394 warn_sign_compare
= value
;
396 warn_strict_aliasing
= value
;
397 warn_string_literal_comparison
= value
;
398 warn_always_true
= value
;
400 /* Only warn about unknown pragmas that are not in system
402 warn_unknown_pragmas
= value
;
404 /* We save the value of warn_uninitialized, since if they put
405 -Wuninitialized on the command line, we need to generate a
406 warning about not using it without also specifying -O. */
407 if (warn_uninitialized
!= 1)
408 warn_uninitialized
= (value
? 2 : 0);
410 if (!c_dialect_cxx ())
411 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding
412 can turn it off only if it's not explicit. */
413 warn_main
= value
* 2;
416 /* C++-specific warnings. */
417 warn_reorder
= value
;
418 warn_nontemplate_friend
= value
;
420 warn_write_strings
= true;
423 cpp_opts
->warn_trigraphs
= value
;
424 cpp_opts
->warn_comments
= value
;
425 cpp_opts
->warn_num_sign_change
= value
;
426 cpp_opts
->warn_multichar
= value
; /* Was C++ only. */
428 if (warn_pointer_sign
== -1)
429 warn_pointer_sign
= 1;
434 cpp_opts
->warn_comments
= value
;
437 case OPT_Wdeprecated
:
438 cpp_opts
->warn_deprecated
= value
;
441 case OPT_Wendif_labels
:
442 cpp_opts
->warn_endif_labels
= value
;
446 cpp_opts
->warnings_are_errors
= value
;
447 global_dc
->warning_as_error_requested
= value
;
450 case OPT_Werror_implicit_function_declaration
:
451 mesg_implicit_function_declaration
= 2;
459 set_Wformat (atoi (arg
));
463 set_Wimplicit (value
);
467 /* Silently ignore for now. */
470 case OPT_Winvalid_pch
:
471 cpp_opts
->warn_invalid_pch
= value
;
481 case OPT_Wmissing_include_dirs
:
482 cpp_opts
->warn_missing_include_dirs
= value
;
486 cpp_opts
->warn_multichar
= value
;
489 case OPT_Wnormalized_
:
490 if (!value
|| (arg
&& strcasecmp (arg
, "none") == 0))
491 cpp_opts
->warn_normalize
= normalized_none
;
492 else if (!arg
|| strcasecmp (arg
, "nfkc") == 0)
493 cpp_opts
->warn_normalize
= normalized_KC
;
494 else if (strcasecmp (arg
, "id") == 0)
495 cpp_opts
->warn_normalize
= normalized_identifier_C
;
496 else if (strcasecmp (arg
, "nfc") == 0)
497 cpp_opts
->warn_normalize
= normalized_C
;
499 error ("argument %qs to %<-Wnormalized%> not recognized", arg
);
502 case OPT_Wreturn_type
:
503 warn_return_type
= value
;
506 case OPT_Wstrict_null_sentinel
:
507 warn_strict_null_sentinel
= value
;
510 case OPT_Wsystem_headers
:
511 cpp_opts
->warn_system_headers
= value
;
514 case OPT_Wtraditional
:
515 cpp_opts
->warn_traditional
= value
;
519 cpp_opts
->warn_trigraphs
= value
;
523 cpp_opts
->warn_undef
= value
;
526 case OPT_Wunknown_pragmas
:
527 /* Set to greater than 1, so that even unknown pragmas in
528 system headers will be warned about. */
529 warn_unknown_pragmas
= value
* 2;
532 case OPT_Wunused_macros
:
533 warn_unused_macros
= value
;
536 case OPT_Wvariadic_macros
:
537 warn_variadic_macros
= value
;
540 case OPT_Wwrite_strings
:
541 warn_write_strings
= value
;
547 warn_nonvdtor
= true;
551 if (!c_dialect_cxx ())
552 set_std_c89 (false, true);
554 set_std_cxx98 (true);
561 case OPT_fcond_mismatch
:
562 if (!c_dialect_cxx ())
564 flag_cond_mismatch
= value
;
569 case OPT_fall_virtual
:
570 case OPT_falt_external_templates
:
571 case OPT_fenum_int_equiv
:
572 case OPT_fexternal_templates
:
573 case OPT_fguiding_decls
:
575 case OPT_fhuge_objects
:
577 case OPT_fname_mangling_version_
:
579 case OPT_fnonnull_objects
:
581 case OPT_fstrict_prototype
:
582 case OPT_fthis_is_variable
:
583 case OPT_fvtable_thunks
:
586 warning (0, "switch %qs is no longer supported", option
->opt_text
);
589 case OPT_faccess_control
:
590 flag_access_control
= value
;
594 flag_no_asm
= !value
;
598 flag_no_builtin
= !value
;
605 disable_builtin_function (arg
);
608 case OPT_fdollars_in_identifiers
:
609 cpp_opts
->dollars_in_ident
= value
;
612 case OPT_ffreestanding
:
614 /* Fall through.... */
617 flag_no_builtin
= !value
;
618 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
619 if (!value
&& warn_main
== 2)
623 case OPT_fshort_double
:
624 flag_short_double
= value
;
627 case OPT_fshort_enums
:
628 flag_short_enums
= value
;
631 case OPT_fshort_wchar
:
632 flag_short_wchar
= value
;
635 case OPT_fsigned_bitfields
:
636 flag_signed_bitfields
= value
;
639 case OPT_fsigned_char
:
640 flag_signed_char
= value
;
643 case OPT_funsigned_bitfields
:
644 flag_signed_bitfields
= !value
;
647 case OPT_funsigned_char
:
648 flag_signed_char
= !value
;
652 flag_check_new
= value
;
655 case OPT_fconserve_space
:
656 flag_conserve_space
= 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_fuse_cxa_get_exception_ptr
:
797 flag_use_cxa_get_exception_ptr
= value
;
800 case OPT_fvisibility_inlines_hidden
:
801 visibility_options
.inlines_hidden
= value
;
808 case OPT_fthreadsafe_statics
:
809 flag_threadsafe_statics
= value
;
813 flag_zero_link
= value
;
817 flag_gen_declaration
= 1;
821 add_path (xstrdup (arg
), AFTER
, 0, true);
826 defer_opt (code
, arg
);
838 add_path (xstrdup (arg
), QUOTE
, 0, true);
846 add_path (xstrdup (arg
), SYSTEM
, 0, true);
849 case OPT_iwithprefix
:
850 add_prefixed_path (arg
, SYSTEM
);
853 case OPT_iwithprefixbefore
:
854 add_prefixed_path (arg
, BRACKET
);
858 cpp_set_lang (parse_in
, CLK_ASM
);
859 cpp_opts
->dollars_in_ident
= false;
862 case OPT_lang_fortran
:
882 error ("output filename specified twice");
885 /* We need to handle the -pedantic switches here, rather than in
886 c_common_post_options, so that a subsequent -Wno-endif-labels
887 is not overridden. */
888 case OPT_pedantic_errors
:
889 cpp_opts
->pedantic_errors
= 1;
892 cpp_opts
->pedantic
= 1;
893 cpp_opts
->warn_endif_labels
= 1;
894 if (warn_pointer_sign
== -1)
895 warn_pointer_sign
= 1;
896 if (warn_overlength_strings
== -1)
897 warn_overlength_strings
= 1;
900 case OPT_print_objc_runtime_info
:
901 print_struct_values
= 1;
904 case OPT_print_pch_checksum
:
905 c_common_print_pch_checksum (stdout
);
906 exit_after_options
= true;
914 case OPT_std_gnu__98
:
915 if (!preprocessing_asm_p
)
916 set_std_cxx98 (code
== OPT_std_c__98
/* ISO */);
920 case OPT_std_gnu__0x
:
921 if (!preprocessing_asm_p
)
922 set_std_cxx0x (code
== OPT_std_c__0x
/* ISO */);
926 case OPT_std_iso9899_1990
:
927 case OPT_std_iso9899_199409
:
928 if (!preprocessing_asm_p
)
929 set_std_c89 (code
== OPT_std_iso9899_199409
/* c94 */, true /* ISO */);
933 if (!preprocessing_asm_p
)
934 set_std_c89 (false /* c94 */, false /* ISO */);
939 case OPT_std_iso9899_1999
:
940 case OPT_std_iso9899_199x
:
941 if (!preprocessing_asm_p
)
942 set_std_c99 (true /* ISO */);
947 if (!preprocessing_asm_p
)
948 set_std_c99 (false /* ISO */);
952 cpp_opts
->trigraphs
= 1;
955 case OPT_traditional_cpp
:
956 cpp_opts
->traditional
= 1;
964 cpp_opts
->inhibit_warnings
= 1;
975 /* Post-switch processing. */
977 c_common_post_options (const char **pfilename
)
979 struct cpp_callbacks
*cb
;
981 /* Canonicalize the input and output filenames. */
982 if (in_fnames
== NULL
)
984 in_fnames
= XNEWVEC (const char *, 1);
987 else if (strcmp (in_fnames
[0], "-") == 0)
990 if (out_fname
== NULL
|| !strcmp (out_fname
, "-"))
993 if (cpp_opts
->deps
.style
== DEPS_NONE
)
994 check_deps_environment_vars ();
996 handle_deferred_opts ();
998 sanitize_cpp_opts ();
1000 register_include_chains (parse_in
, sysroot
, iprefix
, imultilib
,
1001 std_inc
, std_cxx_inc
&& c_dialect_cxx (), verbose
);
1003 #ifdef C_COMMON_OVERRIDE_OPTIONS
1004 /* Some machines may reject certain combinations of C
1005 language-specific options. */
1006 C_COMMON_OVERRIDE_OPTIONS
;
1009 flag_inline_trees
= 1;
1011 /* Use tree inlining. */
1012 if (!flag_no_inline
)
1014 if (flag_inline_functions
)
1015 flag_inline_trees
= 2;
1017 /* If we are given more than one input file, we must use
1018 unit-at-a-time mode. */
1019 if (num_in_fnames
> 1)
1020 flag_unit_at_a_time
= 1;
1022 /* Default to ObjC sjlj exception handling if NeXT runtime. */
1023 if (flag_objc_sjlj_exceptions
< 0)
1024 flag_objc_sjlj_exceptions
= flag_next_runtime
;
1025 if (flag_objc_exceptions
&& !flag_objc_sjlj_exceptions
)
1026 flag_exceptions
= 1;
1028 /* -Wextra implies -Wclobbered, -Wempty-body, -Wsign-compare,
1029 -Wmissing-field-initializers, -Wmissing-parameter-type
1030 -Wold-style-declaration, and -Woverride-init,
1031 but not if explicitly overridden. */
1032 if (warn_clobbered
== -1)
1033 warn_clobbered
= extra_warnings
;
1034 if (warn_empty_body
== -1)
1035 warn_empty_body
= extra_warnings
;
1036 if (warn_sign_compare
== -1)
1037 warn_sign_compare
= extra_warnings
;
1038 if (warn_missing_field_initializers
== -1)
1039 warn_missing_field_initializers
= extra_warnings
;
1040 if (warn_missing_parameter_type
== -1)
1041 warn_missing_parameter_type
= extra_warnings
;
1042 if (warn_old_style_declaration
== -1)
1043 warn_old_style_declaration
= extra_warnings
;
1044 if (warn_override_init
== -1)
1045 warn_override_init
= extra_warnings
;
1047 /* -Wpointer_sign is disabled by default, but it is enabled if any
1048 of -Wall or -pedantic are given. */
1049 if (warn_pointer_sign
== -1)
1050 warn_pointer_sign
= 0;
1052 /* -Woverlength-strings is off by default, but is enabled by -pedantic.
1053 It is never enabled in C++, as the minimum limit is not normative
1054 in that standard. */
1055 if (warn_overlength_strings
== -1 || c_dialect_cxx ())
1056 warn_overlength_strings
= 0;
1058 /* Special format checking options don't work without -Wformat; warn if
1062 warning (OPT_Wformat_y2k
,
1063 "-Wformat-y2k ignored without -Wformat");
1064 warning (OPT_Wformat_extra_args
,
1065 "-Wformat-extra-args ignored without -Wformat");
1066 warning (OPT_Wformat_zero_length
,
1067 "-Wformat-zero-length ignored without -Wformat");
1068 warning (OPT_Wformat_nonliteral
,
1069 "-Wformat-nonliteral ignored without -Wformat");
1070 warning (OPT_Wformat_security
,
1071 "-Wformat-security ignored without -Wformat");
1074 /* C99 requires special handling of complex multiplication and division;
1075 -ffast-math and -fcx-limited-range are handled in process_options. */
1077 flag_complex_method
= 2;
1079 if (flag_preprocess_only
)
1081 /* Open the output now. We must do so even if flag_no_output is
1082 on, because there may be other output than from the actual
1083 preprocessing (e.g. from -dM). */
1084 if (out_fname
[0] == '\0')
1085 out_stream
= stdout
;
1087 out_stream
= fopen (out_fname
, "w");
1089 if (out_stream
== NULL
)
1091 fatal_error ("opening output file %s: %m", out_fname
);
1095 if (num_in_fnames
> 1)
1096 error ("too many filenames given. Type %s --help for usage",
1099 init_pp_output (out_stream
);
1105 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1106 input_location
= UNKNOWN_LOCATION
;
1109 cb
= cpp_get_callbacks (parse_in
);
1110 cb
->file_change
= cb_file_change
;
1111 cb
->dir_change
= cb_dir_change
;
1112 cpp_post_options (parse_in
);
1114 input_location
= UNKNOWN_LOCATION
;
1116 /* If an error has occurred in cpplib, note it so we fail
1118 errorcount
+= cpp_errors (parse_in
);
1120 *pfilename
= this_input_filename
1121 = cpp_read_main_file (parse_in
, in_fnames
[0]);
1122 /* Don't do any compilation or preprocessing if there is no input file. */
1123 if (this_input_filename
== NULL
)
1129 if (flag_working_directory
1130 && flag_preprocess_only
&& !flag_no_line_commands
)
1131 pp_dir_change (parse_in
, get_src_pwd ());
1133 return flag_preprocess_only
;
1136 /* Front end initialization common to C, ObjC and C++. */
1138 c_common_init (void)
1140 /* Set up preprocessor arithmetic. Must be done after call to
1141 c_common_nodes_and_builtins for type nodes to be good. */
1142 cpp_opts
->precision
= TYPE_PRECISION (intmax_type_node
);
1143 cpp_opts
->char_precision
= TYPE_PRECISION (char_type_node
);
1144 cpp_opts
->int_precision
= TYPE_PRECISION (integer_type_node
);
1145 cpp_opts
->wchar_precision
= TYPE_PRECISION (wchar_type_node
);
1146 cpp_opts
->unsigned_wchar
= TYPE_UNSIGNED (wchar_type_node
);
1147 cpp_opts
->bytes_big_endian
= BYTES_BIG_ENDIAN
;
1149 /* This can't happen until after wchar_precision and bytes_big_endian
1151 cpp_init_iconv (parse_in
);
1154 c_common_print_pch_checksum (stderr
);
1156 if (flag_preprocess_only
)
1159 preprocess_file (parse_in
);
1163 /* Has to wait until now so that cpplib has its hash table. */
1169 /* Initialize the integrated preprocessor after debug output has been
1170 initialized; loop over each input file. */
1172 c_common_parse_file (int set_yydebug
)
1180 warning(0, "The C parser does not support -dy, option ignored");
1184 "The Objective-C parser does not support -dy, option ignored");
1187 warning(0, "The C++ parser does not support -dy, option ignored");
1191 "The Objective-C++ parser does not support -dy, option ignored");
1200 /* Start the main input file, if the debug writer wants it. */
1201 if (debug_hooks
->start_end_main_source_file
)
1202 (*debug_hooks
->start_source_file
) (0, this_input_filename
);
1209 /* And end the main input file, if the debug writer wants it */
1210 if (debug_hooks
->start_end_main_source_file
)
1211 (*debug_hooks
->end_source_file
) (0);
1212 if (++i
>= num_in_fnames
)
1214 cpp_undef_all (parse_in
);
1216 = cpp_read_main_file (parse_in
, in_fnames
[i
]);
1217 /* If an input file is missing, abandon further compilation.
1218 cpplib has issued a diagnostic. */
1219 if (!this_input_filename
)
1224 /* Common finish hook for the C, ObjC and C++ front ends. */
1226 c_common_finish (void)
1228 FILE *deps_stream
= NULL
;
1230 if (cpp_opts
->deps
.style
!= DEPS_NONE
)
1232 /* If -M or -MM was seen without -MF, default output to the
1235 deps_stream
= out_stream
;
1238 deps_stream
= fopen (deps_file
, deps_append
? "a": "w");
1240 fatal_error ("opening dependency file %s: %m", deps_file
);
1244 /* For performance, avoid tearing down cpplib's internal structures
1245 with cpp_destroy (). */
1246 errorcount
+= cpp_finish (parse_in
, deps_stream
);
1248 if (deps_stream
&& deps_stream
!= out_stream
1249 && (ferror (deps_stream
) || fclose (deps_stream
)))
1250 fatal_error ("closing dependency file %s: %m", deps_file
);
1252 if (out_stream
&& (ferror (out_stream
) || fclose (out_stream
)))
1253 fatal_error ("when writing output to %s: %m", out_fname
);
1256 /* Either of two environment variables can specify output of
1257 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1258 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1259 and DEPS_TARGET is the target to mention in the deps. They also
1260 result in dependency information being appended to the output file
1261 rather than overwriting it, and like Sun's compiler
1262 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1264 check_deps_environment_vars (void)
1268 GET_ENVIRONMENT (spec
, "DEPENDENCIES_OUTPUT");
1270 cpp_opts
->deps
.style
= DEPS_USER
;
1273 GET_ENVIRONMENT (spec
, "SUNPRO_DEPENDENCIES");
1276 cpp_opts
->deps
.style
= DEPS_SYSTEM
;
1277 cpp_opts
->deps
.ignore_main_file
= true;
1283 /* Find the space before the DEPS_TARGET, if there is one. */
1284 char *s
= strchr (spec
, ' ');
1287 /* Let the caller perform MAKE quoting. */
1288 defer_opt (OPT_MT
, s
+ 1);
1292 /* Command line -MF overrides environment variables and default. */
1301 /* Handle deferred command line switches. */
1303 handle_deferred_opts (void)
1308 /* Avoid allocating the deps buffer if we don't need it.
1309 (This flag may be true without there having been -MT or -MQ
1310 options, but we'll still need the deps buffer.) */
1314 deps
= cpp_get_deps (parse_in
);
1316 for (i
= 0; i
< deferred_count
; i
++)
1318 struct deferred_opt
*opt
= &deferred_opts
[i
];
1320 if (opt
->code
== OPT_MT
|| opt
->code
== OPT_MQ
)
1321 deps_add_target (deps
, opt
->arg
, opt
->code
== OPT_MQ
);
1325 /* These settings are appropriate for GCC, but not necessarily so for
1326 cpplib as a library. */
1328 sanitize_cpp_opts (void)
1330 /* If we don't know what style of dependencies to output, complain
1331 if any other dependency switches have been given. */
1332 if (deps_seen
&& cpp_opts
->deps
.style
== DEPS_NONE
)
1333 error ("to generate dependencies you must specify either -M or -MM");
1335 /* -dM and dependencies suppress normal output; do it here so that
1336 the last -d[MDN] switch overrides earlier ones. */
1337 if (flag_dump_macros
== 'M')
1340 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1341 -dM since at least glibc relies on -M -dM to work. */
1342 /* Also, flag_no_output implies flag_no_line_commands, always. */
1345 if (flag_dump_macros
!= 'M')
1346 flag_dump_macros
= 0;
1347 flag_dump_includes
= 0;
1348 flag_no_line_commands
= 1;
1351 cpp_opts
->unsigned_char
= !flag_signed_char
;
1352 cpp_opts
->stdc_0_in_system_headers
= STDC_0_IN_SYSTEM_HEADERS
;
1354 /* We want -Wno-long-long to override -pedantic -std=non-c99
1355 and/or -Wtraditional, whatever the ordering. */
1356 cpp_opts
->warn_long_long
1357 = warn_long_long
&& ((!flag_isoc99
&& pedantic
) || warn_traditional
);
1359 /* Similarly with -Wno-variadic-macros. No check for c99 here, since
1360 this also turns off warnings about GCCs extension. */
1361 cpp_opts
->warn_variadic_macros
1362 = warn_variadic_macros
&& (pedantic
|| warn_traditional
);
1364 /* If we're generating preprocessor output, emit current directory
1365 if explicitly requested or if debugging information is enabled.
1366 ??? Maybe we should only do it for debugging formats that
1367 actually output the current directory? */
1368 if (flag_working_directory
== -1)
1369 flag_working_directory
= (debug_info_level
!= DINFO_LEVEL_NONE
);
1372 /* Add include path with a prefix at the front of its name. */
1374 add_prefixed_path (const char *suffix
, size_t chain
)
1378 size_t prefix_len
, suffix_len
;
1380 suffix_len
= strlen (suffix
);
1381 prefix
= iprefix
? iprefix
: cpp_GCC_INCLUDE_DIR
;
1382 prefix_len
= iprefix
? strlen (iprefix
) : cpp_GCC_INCLUDE_DIR_len
;
1384 path
= (char *) xmalloc (prefix_len
+ suffix_len
+ 1);
1385 memcpy (path
, prefix
, prefix_len
);
1386 memcpy (path
+ prefix_len
, suffix
, suffix_len
);
1387 path
[prefix_len
+ suffix_len
] = '\0';
1389 add_path (path
, chain
, 0, false);
1392 /* Handle -D, -U, -A, -imacros, and the first -include. */
1394 finish_options (void)
1396 if (!cpp_opts
->preprocessed
)
1400 cb_file_change (parse_in
,
1401 linemap_add (&line_table
, LC_RENAME
, 0,
1402 _("<built-in>"), 0));
1404 cpp_init_builtins (parse_in
, flag_hosted
);
1405 c_cpp_builtins (parse_in
);
1407 /* We're about to send user input to cpplib, so make it warn for
1408 things that we previously (when we sent it internal definitions)
1409 told it to not warn.
1411 C99 permits implementation-defined characters in identifiers.
1412 The documented meaning of -std= is to turn off extensions that
1413 conflict with the specified standard, and since a strictly
1414 conforming program cannot contain a '$', we do not condition
1415 their acceptance on the -std= setting. */
1416 cpp_opts
->warn_dollars
= (cpp_opts
->pedantic
&& !cpp_opts
->c99
);
1418 cb_file_change (parse_in
,
1419 linemap_add (&line_table
, LC_RENAME
, 0,
1420 _("<command-line>"), 0));
1422 for (i
= 0; i
< deferred_count
; i
++)
1424 struct deferred_opt
*opt
= &deferred_opts
[i
];
1426 if (opt
->code
== OPT_D
)
1427 cpp_define (parse_in
, opt
->arg
);
1428 else if (opt
->code
== OPT_U
)
1429 cpp_undef (parse_in
, opt
->arg
);
1430 else if (opt
->code
== OPT_A
)
1432 if (opt
->arg
[0] == '-')
1433 cpp_unassert (parse_in
, opt
->arg
+ 1);
1435 cpp_assert (parse_in
, opt
->arg
);
1439 /* Handle -imacros after -D and -U. */
1440 for (i
= 0; i
< deferred_count
; i
++)
1442 struct deferred_opt
*opt
= &deferred_opts
[i
];
1444 if (opt
->code
== OPT_imacros
1445 && cpp_push_include (parse_in
, opt
->arg
))
1447 /* Disable push_command_line_include callback for now. */
1448 include_cursor
= deferred_count
+ 1;
1449 cpp_scan_nooutput (parse_in
);
1455 push_command_line_include ();
1458 /* Give CPP the next file given by -include, if any. */
1460 push_command_line_include (void)
1462 while (include_cursor
< deferred_count
)
1464 struct deferred_opt
*opt
= &deferred_opts
[include_cursor
++];
1466 if (!cpp_opts
->preprocessed
&& opt
->code
== OPT_include
1467 && cpp_push_include (parse_in
, opt
->arg
))
1471 if (include_cursor
== deferred_count
)
1474 /* -Wunused-macros should only warn about macros defined hereafter. */
1475 cpp_opts
->warn_unused_macros
= warn_unused_macros
;
1476 /* Restore the line map from <command line>. */
1477 if (!cpp_opts
->preprocessed
)
1478 cpp_change_file (parse_in
, LC_RENAME
, this_input_filename
);
1480 /* Set this here so the client can change the option if it wishes,
1481 and after stacking the main file so we don't trace the main file. */
1482 line_table
.trace_includes
= cpp_opts
->print_include_names
;
1486 /* File change callback. Has to handle -include files. */
1488 cb_file_change (cpp_reader
* ARG_UNUSED (pfile
),
1489 const struct line_map
*new_map
)
1491 if (flag_preprocess_only
)
1492 pp_file_change (new_map
);
1494 fe_file_change (new_map
);
1496 if (new_map
== 0 || (new_map
->reason
== LC_LEAVE
&& MAIN_FILE_P (new_map
)))
1497 push_command_line_include ();
1501 cb_dir_change (cpp_reader
* ARG_UNUSED (pfile
), const char *dir
)
1503 if (!set_src_pwd (dir
))
1504 warning (0, "too late for # directive to set debug directory");
1507 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1508 extensions if ISO). There is no concept of gnu94. */
1510 set_std_c89 (int c94
, int iso
)
1512 cpp_set_lang (parse_in
, c94
? CLK_STDC94
: iso
? CLK_STDC89
: CLK_GNUC89
);
1515 flag_no_gnu_keywords
= iso
;
1516 flag_no_nonansi_builtin
= iso
;
1521 /* Set the C 99 standard (without GNU extensions if ISO). */
1523 set_std_c99 (int iso
)
1525 cpp_set_lang (parse_in
, iso
? CLK_STDC99
: CLK_GNUC99
);
1527 flag_no_nonansi_builtin
= iso
;
1533 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1535 set_std_cxx98 (int iso
)
1537 cpp_set_lang (parse_in
, iso
? CLK_CXX98
: CLK_GNUCXX
);
1538 flag_no_gnu_keywords
= iso
;
1539 flag_no_nonansi_builtin
= iso
;
1543 /* Set the C++ 0x working draft "standard" (without GNU extensions if ISO). */
1545 set_std_cxx0x (int iso
)
1547 cpp_set_lang (parse_in
, iso
? CLK_CXX0X
: CLK_GNUCXX0X
);
1548 flag_no_gnu_keywords
= iso
;
1549 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;