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
25 #include "coretypes.h"
32 #include "langhooks.h"
33 #include "tree-inline.h"
34 #include "diagnostic.h"
36 #include "cppdefault.h"
37 #include "c-incpath.h"
38 #include "debug.h" /* For debug_hooks. */
43 #ifndef DOLLARS_IN_IDENTIFIERS
44 # define DOLLARS_IN_IDENTIFIERS true
47 #ifndef TARGET_SYSTEM_ROOT
48 # define TARGET_SYSTEM_ROOT NULL
52 #define TARGET_OPTF(ARG)
56 static cpp_options
*cpp_opts
;
59 static const char *this_input_filename
;
61 /* Filename and stream for preprocessed output. */
62 static const char *out_fname
;
63 static FILE *out_stream
;
65 /* Append dependencies to deps_file. */
66 static bool deps_append
;
68 /* If dependency switches (-MF etc.) have been given. */
69 static bool deps_seen
;
74 /* If -lang-fortran seen. */
75 static bool lang_fortran
= false;
77 /* Dependency output file. */
78 static const char *deps_file
;
80 /* The prefix given by -iprefix, if any. */
81 static const char *iprefix
;
83 /* The multilib directory given by -imultilib, if any. */
84 static const char *imultilib
;
86 /* The system root, if any. Overridden by -isysroot. */
87 static const char *sysroot
= TARGET_SYSTEM_ROOT
;
89 /* Zero disables all standard directories for headers. */
90 static bool std_inc
= true;
92 /* Zero disables the C++-specific standard directories for headers. */
93 static bool std_cxx_inc
= true;
95 /* If the quote chain has been split by -I-. */
96 static bool quote_chain_split
;
98 /* If -Wunused-macros. */
99 static bool warn_unused_macros
;
101 /* If -Wvariadic-macros. */
102 static bool warn_variadic_macros
= true;
104 /* Number of deferred options. */
105 static size_t deferred_count
;
107 /* Number of deferred options scanned for -include. */
108 static size_t include_cursor
;
110 static void set_Wimplicit (int);
111 static void handle_OPT_d (const char *);
112 static void set_std_cxx98 (int);
113 static void set_std_cxx0x (int);
114 static void set_std_c89 (int, int);
115 static void set_std_c99 (int);
116 static void check_deps_environment_vars (void);
117 static void handle_deferred_opts (void);
118 static void sanitize_cpp_opts (void);
119 static void add_prefixed_path (const char *, size_t);
120 static void push_command_line_include (void);
121 static void cb_file_change (cpp_reader
*, const struct line_map
*);
122 static void cb_dir_change (cpp_reader
*, const char *);
123 static void finish_options (void);
125 #ifndef STDC_0_IN_SYSTEM_HEADERS
126 #define STDC_0_IN_SYSTEM_HEADERS 0
129 /* Holds switches parsed by c_common_handle_option (), but whose
130 handling is deferred to c_common_post_options (). */
131 static void defer_opt (enum opt_code
, const char *);
132 static struct deferred_opt
138 /* Complain that switch CODE expects an argument but none was
139 provided. OPT was the command-line option. Return FALSE to get
140 the default message in opts.c, TRUE if we provide a specialized
143 c_common_missing_argument (const char *opt
, size_t code
)
148 /* Pick up the default message. */
151 case OPT_fconstant_string_class_
:
152 error ("no class name specified with %qs", opt
);
156 error ("assertion missing after %qs", opt
);
161 error ("macro name missing after %qs", opt
);
170 error ("missing path after %qs", opt
);
179 error ("missing filename after %qs", opt
);
184 error ("missing makefile target after %qs", opt
);
191 /* Defer option CODE with argument ARG. */
193 defer_opt (enum opt_code code
, const char *arg
)
195 deferred_opts
[deferred_count
].code
= code
;
196 deferred_opts
[deferred_count
].arg
= arg
;
200 /* Common initialization before parsing options. */
202 c_common_init_options (unsigned int argc
, const char **argv
)
204 static const unsigned int lang_flags
[] = {CL_C
, CL_ObjC
, CL_CXX
, CL_ObjCXX
};
205 unsigned int i
, result
;
207 /* This is conditionalized only because that is the way the front
208 ends used to do it. Maybe this should be unconditional? */
209 if (c_dialect_cxx ())
211 /* By default wrap lines at 80 characters. Is getenv
212 ("COLUMNS") preferable? */
213 diagnostic_line_cutoff (global_dc
) = 80;
214 /* By default, emit location information once for every
215 diagnostic message. */
216 diagnostic_prefixing_rule (global_dc
) = DIAGNOSTICS_SHOW_PREFIX_ONCE
;
219 parse_in
= cpp_create_reader (c_dialect_cxx () ? CLK_GNUCXX
: CLK_GNUC89
,
220 ident_hash
, &line_table
);
222 cpp_opts
= cpp_get_options (parse_in
);
223 cpp_opts
->dollars_in_ident
= DOLLARS_IN_IDENTIFIERS
;
224 cpp_opts
->objc
= c_dialect_objc ();
226 /* Reset to avoid warnings on internal definitions. We set it just
227 before passing on command-line options to cpplib. */
228 cpp_opts
->warn_dollars
= 0;
230 flag_exceptions
= c_dialect_cxx ();
231 warn_pointer_arith
= c_dialect_cxx ();
232 warn_write_strings
= c_dialect_cxx();
234 deferred_opts
= XNEWVEC (struct deferred_opt
, argc
);
236 result
= lang_flags
[c_language
];
238 if (c_language
== clk_c
)
240 /* If preprocessing assembly language, accept any of the C-family
241 front end options since the driver may pass them through. */
242 for (i
= 1; i
< argc
; i
++)
243 if (! strcmp (argv
[i
], "-lang-asm"))
245 result
|= CL_C
| CL_ObjC
| CL_CXX
| CL_ObjCXX
;
250 for (i
= 1; i
< argc
; i
++)
251 if (! strcmp (argv
[i
], "-lang-fortran"))
253 result
|= CL_Fortran
;
262 /* Handle switch SCODE with argument ARG. VALUE is true, unless no-
263 form of an -f or -W option was given. Returns 0 if the switch was
264 invalid, a negative number to prevent language-independent
265 processing in toplev.c (a hack necessary for the short-term). */
267 c_common_handle_option (size_t scode
, const char *arg
, int value
)
269 const struct cl_option
*option
= &cl_options
[scode
];
270 enum opt_code code
= (enum opt_code
) scode
;
273 /* Prevent resetting the language standard to a C dialect when the driver
274 has already determined that we're looking at assembler input. */
275 bool preprocessing_asm_p
= (cpp_get_options (parse_in
)->lang
== CLK_ASM
);
280 if (cl_options
[code
].flags
& (CL_C
| CL_CXX
| CL_ObjC
| CL_ObjCXX
))
283 if (lang_fortran
&& (cl_options
[code
].flags
& (CL_Fortran
)))
289 case OPT__output_pch_
:
294 defer_opt (code
, arg
);
298 cpp_opts
->discard_comments
= 0;
302 cpp_opts
->discard_comments
= 0;
303 cpp_opts
->discard_comments_in_macro_exp
= 0;
307 defer_opt (code
, arg
);
311 flag_preprocess_only
= 1;
315 cpp_opts
->print_include_names
= 1;
319 TARGET_OPTF (xstrdup (arg
));
323 if (strcmp (arg
, "-"))
324 add_path (xstrdup (arg
), BRACKET
, 0, true);
327 if (quote_chain_split
)
328 error ("-I- specified twice");
329 quote_chain_split
= true;
330 split_quote_chain ();
331 inform ("obsolete option -I- used, please use -iquote instead");
337 /* When doing dependencies with -M or -MM, suppress normal
338 preprocessed output, but still do -dM etc. as software
339 depends on this. Preprocessed output does occur if -MD, -MMD
340 or environment var dependency generation is used. */
341 cpp_opts
->deps
.style
= (code
== OPT_M
? DEPS_SYSTEM
: DEPS_USER
);
343 cpp_opts
->inhibit_warnings
= 1;
348 cpp_opts
->deps
.style
= (code
== OPT_MD
? DEPS_SYSTEM
: DEPS_USER
);
359 cpp_opts
->deps
.missing_files
= true;
364 cpp_opts
->deps
.phony_targets
= true;
370 defer_opt (code
, arg
);
374 flag_no_line_commands
= 1;
377 case OPT_fworking_directory
:
378 flag_working_directory
= value
;
382 defer_opt (code
, arg
);
388 set_Wimplicit (value
);
389 warn_char_subscripts
= value
;
390 warn_missing_braces
= value
;
391 warn_parentheses
= value
;
392 warn_return_type
= value
;
393 warn_sequence_point
= value
; /* Was C only. */
394 if (c_dialect_cxx ())
395 warn_sign_compare
= value
;
397 warn_strict_aliasing
= value
;
398 warn_strict_overflow
= value
;
399 warn_string_literal_comparison
= value
;
400 warn_always_true
= value
;
401 warn_array_bounds
= 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
;
422 warn_cxx0x_compat
= value
;
424 warn_write_strings
= true;
427 cpp_opts
->warn_trigraphs
= value
;
428 cpp_opts
->warn_comments
= value
;
429 cpp_opts
->warn_num_sign_change
= value
;
430 cpp_opts
->warn_multichar
= value
; /* Was C++ only. */
432 if (warn_pointer_sign
== -1)
433 warn_pointer_sign
= 1;
438 cpp_opts
->warn_comments
= value
;
441 case OPT_Wdeprecated
:
442 cpp_opts
->warn_deprecated
= value
;
445 case OPT_Wendif_labels
:
446 cpp_opts
->warn_endif_labels
= value
;
450 cpp_opts
->warnings_are_errors
= value
;
451 global_dc
->warning_as_error_requested
= value
;
454 case OPT_Werror_implicit_function_declaration
:
455 mesg_implicit_function_declaration
= 2;
463 set_Wformat (atoi (arg
));
467 set_Wimplicit (value
);
471 /* Silently ignore for now. */
474 case OPT_Winvalid_pch
:
475 cpp_opts
->warn_invalid_pch
= value
;
485 case OPT_Wmissing_include_dirs
:
486 cpp_opts
->warn_missing_include_dirs
= value
;
490 cpp_opts
->warn_multichar
= value
;
493 case OPT_Wnormalized_
:
494 if (!value
|| (arg
&& strcasecmp (arg
, "none") == 0))
495 cpp_opts
->warn_normalize
= normalized_none
;
496 else if (!arg
|| strcasecmp (arg
, "nfkc") == 0)
497 cpp_opts
->warn_normalize
= normalized_KC
;
498 else if (strcasecmp (arg
, "id") == 0)
499 cpp_opts
->warn_normalize
= normalized_identifier_C
;
500 else if (strcasecmp (arg
, "nfc") == 0)
501 cpp_opts
->warn_normalize
= normalized_C
;
503 error ("argument %qs to %<-Wnormalized%> not recognized", arg
);
506 case OPT_Wreturn_type
:
507 warn_return_type
= value
;
510 case OPT_Wstrict_null_sentinel
:
511 warn_strict_null_sentinel
= value
;
514 case OPT_Wsystem_headers
:
515 cpp_opts
->warn_system_headers
= value
;
518 case OPT_Wtraditional
:
519 cpp_opts
->warn_traditional
= value
;
523 cpp_opts
->warn_trigraphs
= value
;
527 cpp_opts
->warn_undef
= value
;
530 case OPT_Wunknown_pragmas
:
531 /* Set to greater than 1, so that even unknown pragmas in
532 system headers will be warned about. */
533 warn_unknown_pragmas
= value
* 2;
536 case OPT_Wunused_macros
:
537 warn_unused_macros
= value
;
540 case OPT_Wvariadic_macros
:
541 warn_variadic_macros
= value
;
544 case OPT_Wwrite_strings
:
545 warn_write_strings
= value
;
551 warn_nonvdtor
= true;
555 if (!c_dialect_cxx ())
556 set_std_c89 (false, true);
558 set_std_cxx98 (true);
565 case OPT_fcond_mismatch
:
566 if (!c_dialect_cxx ())
568 flag_cond_mismatch
= value
;
573 case OPT_fall_virtual
:
574 case OPT_falt_external_templates
:
575 case OPT_fenum_int_equiv
:
576 case OPT_fexternal_templates
:
577 case OPT_fguiding_decls
:
579 case OPT_fhuge_objects
:
581 case OPT_fname_mangling_version_
:
583 case OPT_fnonnull_objects
:
585 case OPT_fstrict_prototype
:
586 case OPT_fthis_is_variable
:
587 case OPT_fvtable_thunks
:
590 warning (0, "switch %qs is no longer supported", option
->opt_text
);
593 case OPT_faccess_control
:
594 flag_access_control
= value
;
598 flag_no_asm
= !value
;
602 flag_no_builtin
= !value
;
609 disable_builtin_function (arg
);
612 case OPT_fdollars_in_identifiers
:
613 cpp_opts
->dollars_in_ident
= value
;
616 case OPT_ffreestanding
:
618 /* Fall through.... */
621 flag_no_builtin
= !value
;
622 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
623 if (!value
&& warn_main
== 2)
627 case OPT_fshort_double
:
628 flag_short_double
= value
;
631 case OPT_fshort_enums
:
632 flag_short_enums
= value
;
635 case OPT_fshort_wchar
:
636 flag_short_wchar
= value
;
639 case OPT_fsigned_bitfields
:
640 flag_signed_bitfields
= value
;
643 case OPT_fsigned_char
:
644 flag_signed_char
= value
;
647 case OPT_funsigned_bitfields
:
648 flag_signed_bitfields
= !value
;
651 case OPT_funsigned_char
:
652 flag_signed_char
= !value
;
656 flag_check_new
= value
;
659 case OPT_fconserve_space
:
660 flag_conserve_space
= value
;
663 case OPT_fconstant_string_class_
:
664 constant_string_class_name
= arg
;
667 case OPT_fdefault_inline
:
668 flag_default_inline
= value
;
671 case OPT_felide_constructors
:
672 flag_elide_constructors
= value
;
675 case OPT_fenforce_eh_specs
:
676 flag_enforce_eh_specs
= value
;
679 case OPT_fextended_identifiers
:
680 cpp_opts
->extended_identifiers
= value
;
684 flag_new_for_scope
= value
;
687 case OPT_fgnu_keywords
:
688 flag_no_gnu_keywords
= !value
;
691 case OPT_fgnu_runtime
:
692 flag_next_runtime
= !value
;
695 case OPT_fhandle_exceptions
:
696 warning (0, "-fhandle-exceptions has been renamed -fexceptions (and is now on by default)");
697 flag_exceptions
= value
;
700 case OPT_fimplement_inlines
:
701 flag_implement_inlines
= value
;
704 case OPT_fimplicit_inline_templates
:
705 flag_implicit_inline_templates
= value
;
708 case OPT_fimplicit_templates
:
709 flag_implicit_templates
= value
;
712 case OPT_flax_vector_conversions
:
713 flag_lax_vector_conversions
= value
;
716 case OPT_fms_extensions
:
717 flag_ms_extensions
= value
;
720 case OPT_fnext_runtime
:
721 flag_next_runtime
= value
;
724 case OPT_fnil_receivers
:
725 flag_nil_receivers
= value
;
728 case OPT_fnonansi_builtins
:
729 flag_no_nonansi_builtin
= !value
;
732 case OPT_foperator_names
:
733 cpp_opts
->operator_names
= value
;
736 case OPT_foptional_diags
:
737 flag_optional_diags
= value
;
741 cpp_opts
->restore_pch_deps
= value
;
744 case OPT_fpch_preprocess
:
745 flag_pch_preprocess
= value
;
748 case OPT_fpermissive
:
749 flag_permissive
= value
;
752 case OPT_fpreprocessed
:
753 cpp_opts
->preprocessed
= value
;
756 case OPT_freplace_objc_classes
:
757 flag_replace_objc_classes
= value
;
761 flag_use_repository
= value
;
763 flag_implicit_templates
= 0;
770 case OPT_fshow_column
:
771 cpp_opts
->show_column
= value
;
775 flag_detailed_statistics
= value
;
779 /* It is documented that we silently ignore silly values. */
780 if (value
>= 1 && value
<= 100)
781 cpp_opts
->tabstop
= value
;
784 case OPT_fexec_charset_
:
785 cpp_opts
->narrow_charset
= arg
;
788 case OPT_fwide_exec_charset_
:
789 cpp_opts
->wide_charset
= arg
;
792 case OPT_finput_charset_
:
793 cpp_opts
->input_charset
= arg
;
796 case OPT_ftemplate_depth_
:
797 max_tinst_depth
= value
;
800 case OPT_fuse_cxa_atexit
:
801 flag_use_cxa_atexit
= value
;
804 case OPT_fuse_cxa_get_exception_ptr
:
805 flag_use_cxa_get_exception_ptr
= value
;
808 case OPT_fvisibility_inlines_hidden
:
809 visibility_options
.inlines_hidden
= value
;
816 case OPT_fthreadsafe_statics
:
817 flag_threadsafe_statics
= value
;
821 flag_zero_link
= value
;
825 flag_gen_declaration
= 1;
829 add_path (xstrdup (arg
), AFTER
, 0, true);
834 defer_opt (code
, arg
);
846 add_path (xstrdup (arg
), QUOTE
, 0, true);
854 add_path (xstrdup (arg
), SYSTEM
, 0, true);
857 case OPT_iwithprefix
:
858 add_prefixed_path (arg
, SYSTEM
);
861 case OPT_iwithprefixbefore
:
862 add_prefixed_path (arg
, BRACKET
);
866 cpp_set_lang (parse_in
, CLK_ASM
);
867 cpp_opts
->dollars_in_ident
= false;
870 case OPT_lang_fortran
:
890 error ("output filename specified twice");
893 /* We need to handle the -pedantic switches here, rather than in
894 c_common_post_options, so that a subsequent -Wno-endif-labels
895 is not overridden. */
896 case OPT_pedantic_errors
:
897 cpp_opts
->pedantic_errors
= 1;
900 cpp_opts
->pedantic
= 1;
901 cpp_opts
->warn_endif_labels
= 1;
902 if (warn_pointer_sign
== -1)
903 warn_pointer_sign
= 1;
904 if (warn_overlength_strings
== -1)
905 warn_overlength_strings
= 1;
908 case OPT_print_objc_runtime_info
:
909 print_struct_values
= 1;
912 case OPT_print_pch_checksum
:
913 c_common_print_pch_checksum (stdout
);
914 exit_after_options
= true;
922 case OPT_std_gnu__98
:
923 if (!preprocessing_asm_p
)
924 set_std_cxx98 (code
== OPT_std_c__98
/* ISO */);
928 case OPT_std_gnu__0x
:
929 if (!preprocessing_asm_p
)
930 set_std_cxx0x (code
== OPT_std_c__0x
/* ISO */);
934 case OPT_std_iso9899_1990
:
935 case OPT_std_iso9899_199409
:
936 if (!preprocessing_asm_p
)
937 set_std_c89 (code
== OPT_std_iso9899_199409
/* c94 */, true /* ISO */);
941 if (!preprocessing_asm_p
)
942 set_std_c89 (false /* c94 */, false /* ISO */);
947 case OPT_std_iso9899_1999
:
948 case OPT_std_iso9899_199x
:
949 if (!preprocessing_asm_p
)
950 set_std_c99 (true /* ISO */);
955 if (!preprocessing_asm_p
)
956 set_std_c99 (false /* ISO */);
960 cpp_opts
->trigraphs
= 1;
963 case OPT_traditional_cpp
:
964 cpp_opts
->traditional
= 1;
972 cpp_opts
->inhibit_warnings
= 1;
983 /* Post-switch processing. */
985 c_common_post_options (const char **pfilename
)
987 struct cpp_callbacks
*cb
;
989 /* Canonicalize the input and output filenames. */
990 if (in_fnames
== NULL
)
992 in_fnames
= XNEWVEC (const char *, 1);
995 else if (strcmp (in_fnames
[0], "-") == 0)
998 if (out_fname
== NULL
|| !strcmp (out_fname
, "-"))
1001 if (cpp_opts
->deps
.style
== DEPS_NONE
)
1002 check_deps_environment_vars ();
1004 handle_deferred_opts ();
1006 sanitize_cpp_opts ();
1008 register_include_chains (parse_in
, sysroot
, iprefix
, imultilib
,
1009 std_inc
, std_cxx_inc
&& c_dialect_cxx (), verbose
);
1011 #ifdef C_COMMON_OVERRIDE_OPTIONS
1012 /* Some machines may reject certain combinations of C
1013 language-specific options. */
1014 C_COMMON_OVERRIDE_OPTIONS
;
1017 flag_inline_trees
= 1;
1019 /* Use tree inlining. */
1020 if (!flag_no_inline
)
1022 if (flag_inline_functions
)
1023 flag_inline_trees
= 2;
1025 /* If we are given more than one input file, we must use
1026 unit-at-a-time mode. */
1027 if (num_in_fnames
> 1)
1028 flag_unit_at_a_time
= 1;
1030 /* Default to ObjC sjlj exception handling if NeXT runtime. */
1031 if (flag_objc_sjlj_exceptions
< 0)
1032 flag_objc_sjlj_exceptions
= flag_next_runtime
;
1033 if (flag_objc_exceptions
&& !flag_objc_sjlj_exceptions
)
1034 flag_exceptions
= 1;
1036 /* -Wextra implies -Wclobbered, -Wempty-body, -Wsign-compare,
1037 -Wmissing-field-initializers, -Wmissing-parameter-type
1038 -Wold-style-declaration, and -Woverride-init,
1039 but not if explicitly overridden. */
1040 if (warn_clobbered
== -1)
1041 warn_clobbered
= extra_warnings
;
1042 if (warn_empty_body
== -1)
1043 warn_empty_body
= extra_warnings
;
1044 if (warn_sign_compare
== -1)
1045 warn_sign_compare
= extra_warnings
;
1046 if (warn_missing_field_initializers
== -1)
1047 warn_missing_field_initializers
= extra_warnings
;
1048 if (warn_missing_parameter_type
== -1)
1049 warn_missing_parameter_type
= extra_warnings
;
1050 if (warn_old_style_declaration
== -1)
1051 warn_old_style_declaration
= extra_warnings
;
1052 if (warn_override_init
== -1)
1053 warn_override_init
= extra_warnings
;
1055 /* -Wpointer_sign is disabled by default, but it is enabled if any
1056 of -Wall or -pedantic are given. */
1057 if (warn_pointer_sign
== -1)
1058 warn_pointer_sign
= 0;
1060 /* -Woverlength-strings is off by default, but is enabled by -pedantic.
1061 It is never enabled in C++, as the minimum limit is not normative
1062 in that standard. */
1063 if (warn_overlength_strings
== -1 || c_dialect_cxx ())
1064 warn_overlength_strings
= 0;
1066 /* Special format checking options don't work without -Wformat; warn if
1070 warning (OPT_Wformat_y2k
,
1071 "-Wformat-y2k ignored without -Wformat");
1072 warning (OPT_Wformat_extra_args
,
1073 "-Wformat-extra-args ignored without -Wformat");
1074 warning (OPT_Wformat_zero_length
,
1075 "-Wformat-zero-length ignored without -Wformat");
1076 warning (OPT_Wformat_nonliteral
,
1077 "-Wformat-nonliteral ignored without -Wformat");
1078 warning (OPT_Wformat_security
,
1079 "-Wformat-security ignored without -Wformat");
1082 /* C99 requires special handling of complex multiplication and division;
1083 -ffast-math and -fcx-limited-range are handled in process_options. */
1085 flag_complex_method
= 2;
1087 /* If we're allowing C++0x constructs, don't warn about C++0x
1088 compatibility problems. */
1090 warn_cxx0x_compat
= 0;
1092 if (flag_preprocess_only
)
1094 /* Open the output now. We must do so even if flag_no_output is
1095 on, because there may be other output than from the actual
1096 preprocessing (e.g. from -dM). */
1097 if (out_fname
[0] == '\0')
1098 out_stream
= stdout
;
1100 out_stream
= fopen (out_fname
, "w");
1102 if (out_stream
== NULL
)
1104 fatal_error ("opening output file %s: %m", out_fname
);
1108 if (num_in_fnames
> 1)
1109 error ("too many filenames given. Type %s --help for usage",
1112 init_pp_output (out_stream
);
1118 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1119 input_location
= UNKNOWN_LOCATION
;
1122 cb
= cpp_get_callbacks (parse_in
);
1123 cb
->file_change
= cb_file_change
;
1124 cb
->dir_change
= cb_dir_change
;
1125 cpp_post_options (parse_in
);
1127 input_location
= UNKNOWN_LOCATION
;
1129 /* If an error has occurred in cpplib, note it so we fail
1131 errorcount
+= cpp_errors (parse_in
);
1133 *pfilename
= this_input_filename
1134 = cpp_read_main_file (parse_in
, in_fnames
[0]);
1135 /* Don't do any compilation or preprocessing if there is no input file. */
1136 if (this_input_filename
== NULL
)
1142 if (flag_working_directory
1143 && flag_preprocess_only
&& !flag_no_line_commands
)
1144 pp_dir_change (parse_in
, get_src_pwd ());
1146 return flag_preprocess_only
;
1149 /* Front end initialization common to C, ObjC and C++. */
1151 c_common_init (void)
1153 /* Set up preprocessor arithmetic. Must be done after call to
1154 c_common_nodes_and_builtins for type nodes to be good. */
1155 cpp_opts
->precision
= TYPE_PRECISION (intmax_type_node
);
1156 cpp_opts
->char_precision
= TYPE_PRECISION (char_type_node
);
1157 cpp_opts
->int_precision
= TYPE_PRECISION (integer_type_node
);
1158 cpp_opts
->wchar_precision
= TYPE_PRECISION (wchar_type_node
);
1159 cpp_opts
->unsigned_wchar
= TYPE_UNSIGNED (wchar_type_node
);
1160 cpp_opts
->bytes_big_endian
= BYTES_BIG_ENDIAN
;
1162 /* This can't happen until after wchar_precision and bytes_big_endian
1164 cpp_init_iconv (parse_in
);
1167 c_common_print_pch_checksum (stderr
);
1169 if (flag_preprocess_only
)
1172 preprocess_file (parse_in
);
1176 /* Has to wait until now so that cpplib has its hash table. */
1182 /* Initialize the integrated preprocessor after debug output has been
1183 initialized; loop over each input file. */
1185 c_common_parse_file (int set_yydebug
)
1193 warning(0, "The C parser does not support -dy, option ignored");
1197 "The Objective-C parser does not support -dy, option ignored");
1200 warning(0, "The C++ parser does not support -dy, option ignored");
1204 "The Objective-C++ parser does not support -dy, option ignored");
1213 /* Start the main input file, if the debug writer wants it. */
1214 if (debug_hooks
->start_end_main_source_file
)
1215 (*debug_hooks
->start_source_file
) (0, this_input_filename
);
1222 /* And end the main input file, if the debug writer wants it */
1223 if (debug_hooks
->start_end_main_source_file
)
1224 (*debug_hooks
->end_source_file
) (0);
1225 if (++i
>= num_in_fnames
)
1227 cpp_undef_all (parse_in
);
1229 = cpp_read_main_file (parse_in
, in_fnames
[i
]);
1230 /* If an input file is missing, abandon further compilation.
1231 cpplib has issued a diagnostic. */
1232 if (!this_input_filename
)
1237 /* Common finish hook for the C, ObjC and C++ front ends. */
1239 c_common_finish (void)
1241 FILE *deps_stream
= NULL
;
1243 if (cpp_opts
->deps
.style
!= DEPS_NONE
)
1245 /* If -M or -MM was seen without -MF, default output to the
1248 deps_stream
= out_stream
;
1251 deps_stream
= fopen (deps_file
, deps_append
? "a": "w");
1253 fatal_error ("opening dependency file %s: %m", deps_file
);
1257 /* For performance, avoid tearing down cpplib's internal structures
1258 with cpp_destroy (). */
1259 errorcount
+= cpp_finish (parse_in
, deps_stream
);
1261 if (deps_stream
&& deps_stream
!= out_stream
1262 && (ferror (deps_stream
) || fclose (deps_stream
)))
1263 fatal_error ("closing dependency file %s: %m", deps_file
);
1265 if (out_stream
&& (ferror (out_stream
) || fclose (out_stream
)))
1266 fatal_error ("when writing output to %s: %m", out_fname
);
1269 /* Either of two environment variables can specify output of
1270 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1271 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1272 and DEPS_TARGET is the target to mention in the deps. They also
1273 result in dependency information being appended to the output file
1274 rather than overwriting it, and like Sun's compiler
1275 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1277 check_deps_environment_vars (void)
1281 GET_ENVIRONMENT (spec
, "DEPENDENCIES_OUTPUT");
1283 cpp_opts
->deps
.style
= DEPS_USER
;
1286 GET_ENVIRONMENT (spec
, "SUNPRO_DEPENDENCIES");
1289 cpp_opts
->deps
.style
= DEPS_SYSTEM
;
1290 cpp_opts
->deps
.ignore_main_file
= true;
1296 /* Find the space before the DEPS_TARGET, if there is one. */
1297 char *s
= strchr (spec
, ' ');
1300 /* Let the caller perform MAKE quoting. */
1301 defer_opt (OPT_MT
, s
+ 1);
1305 /* Command line -MF overrides environment variables and default. */
1314 /* Handle deferred command line switches. */
1316 handle_deferred_opts (void)
1321 /* Avoid allocating the deps buffer if we don't need it.
1322 (This flag may be true without there having been -MT or -MQ
1323 options, but we'll still need the deps buffer.) */
1327 deps
= cpp_get_deps (parse_in
);
1329 for (i
= 0; i
< deferred_count
; i
++)
1331 struct deferred_opt
*opt
= &deferred_opts
[i
];
1333 if (opt
->code
== OPT_MT
|| opt
->code
== OPT_MQ
)
1334 deps_add_target (deps
, opt
->arg
, opt
->code
== OPT_MQ
);
1338 /* These settings are appropriate for GCC, but not necessarily so for
1339 cpplib as a library. */
1341 sanitize_cpp_opts (void)
1343 /* If we don't know what style of dependencies to output, complain
1344 if any other dependency switches have been given. */
1345 if (deps_seen
&& cpp_opts
->deps
.style
== DEPS_NONE
)
1346 error ("to generate dependencies you must specify either -M or -MM");
1348 /* -dM and dependencies suppress normal output; do it here so that
1349 the last -d[MDN] switch overrides earlier ones. */
1350 if (flag_dump_macros
== 'M')
1353 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1354 -dM since at least glibc relies on -M -dM to work. */
1355 /* Also, flag_no_output implies flag_no_line_commands, always. */
1358 if (flag_dump_macros
!= 'M')
1359 flag_dump_macros
= 0;
1360 flag_dump_includes
= 0;
1361 flag_no_line_commands
= 1;
1364 cpp_opts
->unsigned_char
= !flag_signed_char
;
1365 cpp_opts
->stdc_0_in_system_headers
= STDC_0_IN_SYSTEM_HEADERS
;
1367 /* We want -Wno-long-long to override -pedantic -std=non-c99
1368 and/or -Wtraditional, whatever the ordering. */
1369 cpp_opts
->warn_long_long
1370 = warn_long_long
&& ((!flag_isoc99
&& pedantic
) || warn_traditional
);
1372 /* Similarly with -Wno-variadic-macros. No check for c99 here, since
1373 this also turns off warnings about GCCs extension. */
1374 cpp_opts
->warn_variadic_macros
1375 = warn_variadic_macros
&& (pedantic
|| warn_traditional
);
1377 /* If we're generating preprocessor output, emit current directory
1378 if explicitly requested or if debugging information is enabled.
1379 ??? Maybe we should only do it for debugging formats that
1380 actually output the current directory? */
1381 if (flag_working_directory
== -1)
1382 flag_working_directory
= (debug_info_level
!= DINFO_LEVEL_NONE
);
1385 /* Add include path with a prefix at the front of its name. */
1387 add_prefixed_path (const char *suffix
, size_t chain
)
1391 size_t prefix_len
, suffix_len
;
1393 suffix_len
= strlen (suffix
);
1394 prefix
= iprefix
? iprefix
: cpp_GCC_INCLUDE_DIR
;
1395 prefix_len
= iprefix
? strlen (iprefix
) : cpp_GCC_INCLUDE_DIR_len
;
1397 path
= (char *) xmalloc (prefix_len
+ suffix_len
+ 1);
1398 memcpy (path
, prefix
, prefix_len
);
1399 memcpy (path
+ prefix_len
, suffix
, suffix_len
);
1400 path
[prefix_len
+ suffix_len
] = '\0';
1402 add_path (path
, chain
, 0, false);
1405 /* Handle -D, -U, -A, -imacros, and the first -include. */
1407 finish_options (void)
1409 if (!cpp_opts
->preprocessed
)
1413 cb_file_change (parse_in
,
1414 linemap_add (&line_table
, LC_RENAME
, 0,
1415 _("<built-in>"), 0));
1417 cpp_init_builtins (parse_in
, flag_hosted
);
1418 c_cpp_builtins (parse_in
);
1420 /* We're about to send user input to cpplib, so make it warn for
1421 things that we previously (when we sent it internal definitions)
1422 told it to not warn.
1424 C99 permits implementation-defined characters in identifiers.
1425 The documented meaning of -std= is to turn off extensions that
1426 conflict with the specified standard, and since a strictly
1427 conforming program cannot contain a '$', we do not condition
1428 their acceptance on the -std= setting. */
1429 cpp_opts
->warn_dollars
= (cpp_opts
->pedantic
&& !cpp_opts
->c99
);
1431 cb_file_change (parse_in
,
1432 linemap_add (&line_table
, LC_RENAME
, 0,
1433 _("<command-line>"), 0));
1435 for (i
= 0; i
< deferred_count
; i
++)
1437 struct deferred_opt
*opt
= &deferred_opts
[i
];
1439 if (opt
->code
== OPT_D
)
1440 cpp_define (parse_in
, opt
->arg
);
1441 else if (opt
->code
== OPT_U
)
1442 cpp_undef (parse_in
, opt
->arg
);
1443 else if (opt
->code
== OPT_A
)
1445 if (opt
->arg
[0] == '-')
1446 cpp_unassert (parse_in
, opt
->arg
+ 1);
1448 cpp_assert (parse_in
, opt
->arg
);
1452 /* Handle -imacros after -D and -U. */
1453 for (i
= 0; i
< deferred_count
; i
++)
1455 struct deferred_opt
*opt
= &deferred_opts
[i
];
1457 if (opt
->code
== OPT_imacros
1458 && cpp_push_include (parse_in
, opt
->arg
))
1460 /* Disable push_command_line_include callback for now. */
1461 include_cursor
= deferred_count
+ 1;
1462 cpp_scan_nooutput (parse_in
);
1468 push_command_line_include ();
1471 /* Give CPP the next file given by -include, if any. */
1473 push_command_line_include (void)
1475 while (include_cursor
< deferred_count
)
1477 struct deferred_opt
*opt
= &deferred_opts
[include_cursor
++];
1479 if (!cpp_opts
->preprocessed
&& opt
->code
== OPT_include
1480 && cpp_push_include (parse_in
, opt
->arg
))
1484 if (include_cursor
== deferred_count
)
1487 /* -Wunused-macros should only warn about macros defined hereafter. */
1488 cpp_opts
->warn_unused_macros
= warn_unused_macros
;
1489 /* Restore the line map from <command line>. */
1490 if (!cpp_opts
->preprocessed
)
1491 cpp_change_file (parse_in
, LC_RENAME
, this_input_filename
);
1493 /* Set this here so the client can change the option if it wishes,
1494 and after stacking the main file so we don't trace the main file. */
1495 line_table
.trace_includes
= cpp_opts
->print_include_names
;
1499 /* File change callback. Has to handle -include files. */
1501 cb_file_change (cpp_reader
* ARG_UNUSED (pfile
),
1502 const struct line_map
*new_map
)
1504 if (flag_preprocess_only
)
1505 pp_file_change (new_map
);
1507 fe_file_change (new_map
);
1509 if (new_map
== 0 || (new_map
->reason
== LC_LEAVE
&& MAIN_FILE_P (new_map
)))
1510 push_command_line_include ();
1514 cb_dir_change (cpp_reader
* ARG_UNUSED (pfile
), const char *dir
)
1516 if (!set_src_pwd (dir
))
1517 warning (0, "too late for # directive to set debug directory");
1520 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1521 extensions if ISO). There is no concept of gnu94. */
1523 set_std_c89 (int c94
, int iso
)
1525 cpp_set_lang (parse_in
, c94
? CLK_STDC94
: iso
? CLK_STDC89
: CLK_GNUC89
);
1528 flag_no_gnu_keywords
= iso
;
1529 flag_no_nonansi_builtin
= iso
;
1534 /* Set the C 99 standard (without GNU extensions if ISO). */
1536 set_std_c99 (int iso
)
1538 cpp_set_lang (parse_in
, iso
? CLK_STDC99
: CLK_GNUC99
);
1540 flag_no_nonansi_builtin
= iso
;
1546 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1548 set_std_cxx98 (int iso
)
1550 cpp_set_lang (parse_in
, iso
? CLK_CXX98
: CLK_GNUCXX
);
1551 flag_no_gnu_keywords
= iso
;
1552 flag_no_nonansi_builtin
= iso
;
1556 /* Set the C++ 0x working draft "standard" (without GNU extensions if ISO). */
1558 set_std_cxx0x (int iso
)
1560 cpp_set_lang (parse_in
, iso
? CLK_CXX0X
: CLK_GNUCXX0X
);
1561 flag_no_gnu_keywords
= iso
;
1562 flag_no_nonansi_builtin
= iso
;
1567 /* Handle setting implicit to ON. */
1569 set_Wimplicit (int on
)
1572 warn_implicit_int
= on
;
1575 if (mesg_implicit_function_declaration
!= 2)
1576 mesg_implicit_function_declaration
= 1;
1579 mesg_implicit_function_declaration
= 0;
1582 /* Args to -d specify what to dump. Silently ignore
1583 unrecognized options; they may be aimed at toplev.c. */
1585 handle_OPT_d (const char *arg
)
1589 while ((c
= *arg
++) != '\0')
1592 case 'M': /* Dump macros only. */
1593 case 'N': /* Dump names. */
1594 case 'D': /* Dump definitions. */
1595 flag_dump_macros
= c
;
1599 flag_dump_includes
= 1;