1 /* C/ObjC/C++ command line option handling.
2 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008
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 3, 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 COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
24 #include "coretypes.h"
31 #include "langhooks.h"
32 #include "tree-inline.h"
33 #include "diagnostic.h"
35 #include "cppdefault.h"
37 #include "debug.h" /* For debug_hooks. */
44 #ifndef DOLLARS_IN_IDENTIFIERS
45 # define DOLLARS_IN_IDENTIFIERS true
48 #ifndef TARGET_SYSTEM_ROOT
49 # define TARGET_SYSTEM_ROOT NULL
53 #define TARGET_OPTF(ARG)
57 cpp_options
*cpp_opts
;
60 static const char *this_input_filename
;
62 /* Filename and stream for preprocessed output. */
63 static const char *out_fname
;
64 static FILE *out_stream
;
66 /* Append dependencies to deps_file. */
67 static bool deps_append
;
69 /* If dependency switches (-MF etc.) have been given. */
70 static bool deps_seen
;
75 /* Dependency output file. */
76 static const char *deps_file
;
78 /* The prefix given by -iprefix, if any. */
79 static const char *iprefix
;
81 /* The multilib directory given by -imultilib, if any. */
82 static const char *imultilib
;
84 /* The system root, if any. Overridden by -isysroot. */
85 static const char *sysroot
= TARGET_SYSTEM_ROOT
;
87 /* Zero disables all standard directories for headers. */
88 static bool std_inc
= true;
90 /* Zero disables the C++-specific standard directories for headers. */
91 static bool std_cxx_inc
= true;
93 /* If the quote chain has been split by -I-. */
94 static bool quote_chain_split
;
96 /* If -Wunused-macros. */
97 static bool warn_unused_macros
;
99 /* If -Wvariadic-macros. */
100 static bool warn_variadic_macros
= true;
102 /* Number of deferred options. */
103 static size_t deferred_count
;
105 /* Number of deferred options scanned for -include. */
106 static size_t include_cursor
;
108 static void set_Wimplicit (int);
109 static void handle_OPT_d (const char *);
110 static void set_std_cxx98 (int);
111 static void set_std_cxx0x (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_exceptions
= c_dialect_cxx ();
229 warn_pointer_arith
= c_dialect_cxx ();
230 warn_write_strings
= c_dialect_cxx();
232 /* By default, C99-like requirements for complex multiply and divide. */
233 flag_complex_method
= 2;
235 deferred_opts
= XNEWVEC (struct deferred_opt
, argc
);
237 result
= lang_flags
[c_language
];
239 if (c_language
== clk_c
)
241 /* If preprocessing assembly language, accept any of the C-family
242 front end options since the driver may pass them through. */
243 for (i
= 1; i
< argc
; i
++)
244 if (! strcmp (argv
[i
], "-lang-asm"))
246 result
|= CL_C
| CL_ObjC
| CL_CXX
| CL_ObjCXX
;
254 /* Handle switch SCODE with argument ARG. VALUE is true, unless no-
255 form of an -f or -W option was given. Returns 0 if the switch was
256 invalid, a negative number to prevent language-independent
257 processing in toplev.c (a hack necessary for the short-term). */
259 c_common_handle_option (size_t scode
, const char *arg
, int value
)
261 const struct cl_option
*option
= &cl_options
[scode
];
262 enum opt_code code
= (enum opt_code
) scode
;
265 /* Prevent resetting the language standard to a C dialect when the driver
266 has already determined that we're looking at assembler input. */
267 bool preprocessing_asm_p
= (cpp_get_options (parse_in
)->lang
== CLK_ASM
);
272 if (cl_options
[code
].flags
& (CL_C
| CL_CXX
| CL_ObjC
| CL_ObjCXX
))
274 if ((option
->flags
& CL_TARGET
)
275 && ! targetcm
.handle_c_option (scode
, arg
, value
))
282 case OPT__output_pch_
:
287 defer_opt (code
, arg
);
291 cpp_opts
->discard_comments
= 0;
295 cpp_opts
->discard_comments
= 0;
296 cpp_opts
->discard_comments_in_macro_exp
= 0;
300 defer_opt (code
, arg
);
304 flag_preprocess_only
= 1;
308 cpp_opts
->print_include_names
= 1;
312 TARGET_OPTF (xstrdup (arg
));
316 if (strcmp (arg
, "-"))
317 add_path (xstrdup (arg
), BRACKET
, 0, true);
320 if (quote_chain_split
)
321 error ("-I- specified twice");
322 quote_chain_split
= true;
323 split_quote_chain ();
324 inform (input_location
, "obsolete option -I- used, please use -iquote instead");
330 /* When doing dependencies with -M or -MM, suppress normal
331 preprocessed output, but still do -dM etc. as software
332 depends on this. Preprocessed output does occur if -MD, -MMD
333 or environment var dependency generation is used. */
334 cpp_opts
->deps
.style
= (code
== OPT_M
? DEPS_SYSTEM
: DEPS_USER
);
336 cpp_opts
->inhibit_warnings
= 1;
341 cpp_opts
->deps
.style
= (code
== OPT_MD
? DEPS_SYSTEM
: DEPS_USER
);
352 cpp_opts
->deps
.missing_files
= true;
357 cpp_opts
->deps
.phony_targets
= true;
363 defer_opt (code
, arg
);
367 flag_no_line_commands
= 1;
370 case OPT_fworking_directory
:
371 flag_working_directory
= value
;
375 defer_opt (code
, arg
);
381 set_Wimplicit (value
);
382 warn_char_subscripts
= value
;
383 warn_missing_braces
= value
;
384 warn_parentheses
= value
;
385 warn_return_type
= value
;
386 warn_sequence_point
= value
; /* Was C only. */
388 if (warn_strict_aliasing
== -1)
389 set_Wstrict_aliasing (value
);
390 warn_address
= value
;
391 if (warn_strict_overflow
== -1)
392 warn_strict_overflow
= value
;
393 warn_array_bounds
= value
;
394 warn_volatile_register_var
= value
;
396 /* Only warn about unknown pragmas that are not in system
398 warn_unknown_pragmas
= value
;
400 /* We save the value of warn_uninitialized, since if they put
401 -Wuninitialized on the command line, we need to generate a
402 warning about not using it without also specifying -O. */
403 if (warn_uninitialized
!= 1)
404 warn_uninitialized
= (value
? 2 : 0);
406 if (!c_dialect_cxx ())
408 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding
409 can turn it off only if it's not explicit. */
411 warn_main
= (value
? 2 : 0);
415 /* C++-specific warnings. */
416 warn_sign_compare
= value
;
417 warn_reorder
= value
;
418 warn_cxx0x_compat
= value
;
421 cpp_opts
->warn_trigraphs
= value
;
422 cpp_opts
->warn_comments
= value
;
423 cpp_opts
->warn_num_sign_change
= value
;
425 if (warn_pointer_sign
== -1)
426 warn_pointer_sign
= 1;
431 cpp_opts
->warn_comments
= value
;
434 case OPT_Wdeprecated
:
435 cpp_opts
->warn_deprecated
= value
;
438 case OPT_Wendif_labels
:
439 cpp_opts
->warn_endif_labels
= value
;
443 cpp_opts
->warnings_are_errors
= value
;
444 global_dc
->warning_as_error_requested
= value
;
447 case OPT_Werror_implicit_function_declaration
:
448 /* For backward compatibility, this is the same as
449 -Werror=implicit-function-declaration. */
450 enable_warning_as_error ("implicit-function-declaration", value
, CL_C
| CL_ObjC
);
458 set_Wformat (atoi (arg
));
462 set_Wimplicit (value
);
466 /* Silently ignore for now. */
469 case OPT_Winvalid_pch
:
470 cpp_opts
->warn_invalid_pch
= value
;
473 case OPT_Wmissing_include_dirs
:
474 cpp_opts
->warn_missing_include_dirs
= value
;
478 cpp_opts
->warn_multichar
= value
;
481 case OPT_Wnormalized_
:
482 if (!value
|| (arg
&& strcasecmp (arg
, "none") == 0))
483 cpp_opts
->warn_normalize
= normalized_none
;
484 else if (!arg
|| strcasecmp (arg
, "nfkc") == 0)
485 cpp_opts
->warn_normalize
= normalized_KC
;
486 else if (strcasecmp (arg
, "id") == 0)
487 cpp_opts
->warn_normalize
= normalized_identifier_C
;
488 else if (strcasecmp (arg
, "nfc") == 0)
489 cpp_opts
->warn_normalize
= normalized_C
;
491 error ("argument %qs to %<-Wnormalized%> not recognized", arg
);
494 case OPT_Wreturn_type
:
495 warn_return_type
= value
;
498 case OPT_Wstrict_null_sentinel
:
499 warn_strict_null_sentinel
= value
;
502 case OPT_Wsystem_headers
:
503 cpp_opts
->warn_system_headers
= value
;
506 case OPT_Wtraditional
:
507 cpp_opts
->warn_traditional
= value
;
511 cpp_opts
->warn_trigraphs
= value
;
515 cpp_opts
->warn_undef
= value
;
518 case OPT_Wunknown_pragmas
:
519 /* Set to greater than 1, so that even unknown pragmas in
520 system headers will be warned about. */
521 warn_unknown_pragmas
= value
* 2;
524 case OPT_Wunused_macros
:
525 warn_unused_macros
= value
;
528 case OPT_Wvariadic_macros
:
529 warn_variadic_macros
= value
;
532 case OPT_Wwrite_strings
:
533 warn_write_strings
= value
;
539 warn_nonvdtor
= true;
543 if (!c_dialect_cxx ())
544 set_std_c89 (false, true);
546 set_std_cxx98 (true);
553 case OPT_fcond_mismatch
:
554 if (!c_dialect_cxx ())
556 flag_cond_mismatch
= value
;
561 case OPT_fall_virtual
:
562 case OPT_falt_external_templates
:
563 case OPT_fenum_int_equiv
:
564 case OPT_fexternal_templates
:
565 case OPT_fguiding_decls
:
567 case OPT_fhuge_objects
:
569 case OPT_fname_mangling_version_
:
571 case OPT_fnonnull_objects
:
573 case OPT_fstrict_prototype
:
574 case OPT_fthis_is_variable
:
575 case OPT_fvtable_thunks
:
578 warning (0, "switch %qs is no longer supported", option
->opt_text
);
581 case OPT_faccess_control
:
582 flag_access_control
= value
;
586 flag_no_asm
= !value
;
590 flag_no_builtin
= !value
;
597 disable_builtin_function (arg
);
600 case OPT_fdirectives_only
:
601 cpp_opts
->directives_only
= value
;
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
;
616 case OPT_fshort_double
:
617 flag_short_double
= value
;
620 case OPT_fshort_enums
:
621 flag_short_enums
= value
;
624 case OPT_fshort_wchar
:
625 flag_short_wchar
= value
;
628 case OPT_fsigned_bitfields
:
629 flag_signed_bitfields
= value
;
632 case OPT_fsigned_char
:
633 flag_signed_char
= value
;
636 case OPT_funsigned_bitfields
:
637 flag_signed_bitfields
= !value
;
640 case OPT_funsigned_char
:
641 flag_signed_char
= !value
;
645 flag_check_new
= value
;
648 case OPT_fconserve_space
:
649 flag_conserve_space
= value
;
652 case OPT_fconstant_string_class_
:
653 constant_string_class_name
= arg
;
656 case OPT_fdefault_inline
:
657 flag_default_inline
= value
;
660 case OPT_felide_constructors
:
661 flag_elide_constructors
= value
;
664 case OPT_fenforce_eh_specs
:
665 flag_enforce_eh_specs
= value
;
668 case OPT_fextended_identifiers
:
669 cpp_opts
->extended_identifiers
= value
;
673 flag_new_for_scope
= value
;
676 case OPT_fgnu_keywords
:
677 flag_no_gnu_keywords
= !value
;
680 case OPT_fgnu_runtime
:
681 flag_next_runtime
= !value
;
684 case OPT_fhandle_exceptions
:
685 warning (0, "-fhandle-exceptions has been renamed -fexceptions (and is now on by default)");
686 flag_exceptions
= value
;
689 case OPT_fimplement_inlines
:
690 flag_implement_inlines
= value
;
693 case OPT_fimplicit_inline_templates
:
694 flag_implicit_inline_templates
= value
;
697 case OPT_fimplicit_templates
:
698 flag_implicit_templates
= value
;
701 case OPT_flax_vector_conversions
:
702 flag_lax_vector_conversions
= value
;
705 case OPT_fms_extensions
:
706 flag_ms_extensions
= value
;
709 case OPT_fnext_runtime
:
710 flag_next_runtime
= value
;
713 case OPT_fnil_receivers
:
714 flag_nil_receivers
= value
;
717 case OPT_fnonansi_builtins
:
718 flag_no_nonansi_builtin
= !value
;
721 case OPT_foperator_names
:
722 cpp_opts
->operator_names
= value
;
725 case OPT_foptional_diags
:
726 flag_optional_diags
= value
;
730 cpp_opts
->restore_pch_deps
= value
;
733 case OPT_fpch_preprocess
:
734 flag_pch_preprocess
= value
;
737 case OPT_fpermissive
:
738 flag_permissive
= value
;
741 case OPT_fpreprocessed
:
742 cpp_opts
->preprocessed
= value
;
745 case OPT_freplace_objc_classes
:
746 flag_replace_objc_classes
= value
;
750 flag_use_repository
= value
;
752 flag_implicit_templates
= 0;
759 case OPT_fshow_column
:
760 cpp_opts
->show_column
= value
;
764 flag_detailed_statistics
= value
;
768 /* It is documented that we silently ignore silly values. */
769 if (value
>= 1 && value
<= 100)
770 cpp_opts
->tabstop
= value
;
773 case OPT_fexec_charset_
:
774 cpp_opts
->narrow_charset
= arg
;
777 case OPT_fwide_exec_charset_
:
778 cpp_opts
->wide_charset
= arg
;
781 case OPT_finput_charset_
:
782 cpp_opts
->input_charset
= arg
;
785 case OPT_ftemplate_depth_
:
786 max_tinst_depth
= value
;
789 case OPT_fuse_cxa_atexit
:
790 flag_use_cxa_atexit
= value
;
793 case OPT_fuse_cxa_get_exception_ptr
:
794 flag_use_cxa_get_exception_ptr
= value
;
797 case OPT_fvisibility_inlines_hidden
:
798 visibility_options
.inlines_hidden
= value
;
805 case OPT_fthreadsafe_statics
:
806 flag_threadsafe_statics
= value
;
810 flag_zero_link
= value
;
814 flag_gen_declaration
= 1;
817 case OPT_femit_struct_debug_baseonly
:
818 set_struct_debug_option ("base");
821 case OPT_femit_struct_debug_reduced
:
822 set_struct_debug_option ("dir:ord:sys,dir:gen:any,ind:base");
825 case OPT_femit_struct_debug_detailed_
:
826 set_struct_debug_option (arg
);
830 add_path (xstrdup (arg
), AFTER
, 0, true);
835 defer_opt (code
, arg
);
847 add_path (xstrdup (arg
), QUOTE
, 0, true);
855 add_path (xstrdup (arg
), SYSTEM
, 0, true);
858 case OPT_iwithprefix
:
859 add_prefixed_path (arg
, SYSTEM
);
862 case OPT_iwithprefixbefore
:
863 add_prefixed_path (arg
, BRACKET
);
867 cpp_set_lang (parse_in
, CLK_ASM
);
868 cpp_opts
->dollars_in_ident
= false;
887 error ("output filename specified twice");
890 /* We need to handle the -pedantic switches here, rather than in
891 c_common_post_options, so that a subsequent -Wno-endif-labels
892 is not overridden. */
893 case OPT_pedantic_errors
:
894 cpp_opts
->pedantic_errors
= 1;
897 cpp_opts
->pedantic
= 1;
898 cpp_opts
->warn_endif_labels
= 1;
899 if (warn_pointer_sign
== -1)
900 warn_pointer_sign
= 1;
901 if (warn_overlength_strings
== -1)
902 warn_overlength_strings
= 1;
907 case OPT_print_objc_runtime_info
:
908 print_struct_values
= 1;
911 case OPT_print_pch_checksum
:
912 c_common_print_pch_checksum (stdout
);
913 exit_after_options
= true;
921 case OPT_std_gnu__98
:
922 if (!preprocessing_asm_p
)
923 set_std_cxx98 (code
== OPT_std_c__98
/* ISO */);
927 case OPT_std_gnu__0x
:
928 if (!preprocessing_asm_p
)
929 set_std_cxx0x (code
== OPT_std_c__0x
/* ISO */);
933 case OPT_std_iso9899_1990
:
934 case OPT_std_iso9899_199409
:
935 if (!preprocessing_asm_p
)
936 set_std_c89 (code
== OPT_std_iso9899_199409
/* c94 */, true /* ISO */);
940 if (!preprocessing_asm_p
)
941 set_std_c89 (false /* c94 */, false /* ISO */);
946 case OPT_std_iso9899_1999
:
947 case OPT_std_iso9899_199x
:
948 if (!preprocessing_asm_p
)
949 set_std_c99 (true /* ISO */);
954 if (!preprocessing_asm_p
)
955 set_std_c99 (false /* ISO */);
959 cpp_opts
->trigraphs
= 1;
962 case OPT_traditional_cpp
:
963 cpp_opts
->traditional
= 1;
971 cpp_opts
->inhibit_warnings
= 1;
982 /* Post-switch processing. */
984 c_common_post_options (const char **pfilename
)
986 struct cpp_callbacks
*cb
;
988 /* Canonicalize the input and output filenames. */
989 if (in_fnames
== NULL
)
991 in_fnames
= XNEWVEC (const char *, 1);
994 else if (strcmp (in_fnames
[0], "-") == 0)
997 if (out_fname
== NULL
|| !strcmp (out_fname
, "-"))
1000 if (cpp_opts
->deps
.style
== DEPS_NONE
)
1001 check_deps_environment_vars ();
1003 handle_deferred_opts ();
1005 sanitize_cpp_opts ();
1007 register_include_chains (parse_in
, sysroot
, iprefix
, imultilib
,
1008 std_inc
, std_cxx_inc
&& c_dialect_cxx (), verbose
);
1010 #ifdef C_COMMON_OVERRIDE_OPTIONS
1011 /* Some machines may reject certain combinations of C
1012 language-specific options. */
1013 C_COMMON_OVERRIDE_OPTIONS
;
1016 /* By default we use C99 inline semantics in GNU99 or C99 mode. C99
1017 inline semantics are not supported in GNU89 or C89 mode. */
1018 if (flag_gnu89_inline
== -1)
1019 flag_gnu89_inline
= !flag_isoc99
;
1020 else if (!flag_gnu89_inline
&& !flag_isoc99
)
1021 error ("-fno-gnu89-inline is only supported in GNU99 or C99 mode");
1023 /* Default to ObjC sjlj exception handling if NeXT runtime. */
1024 if (flag_objc_sjlj_exceptions
< 0)
1025 flag_objc_sjlj_exceptions
= flag_next_runtime
;
1026 if (flag_objc_exceptions
&& !flag_objc_sjlj_exceptions
)
1027 flag_exceptions
= 1;
1029 /* -Wextra implies -Wtype-limits, -Wclobbered,
1030 -Wempty-body, -Wsign-compare,
1031 -Wmissing-field-initializers, -Wmissing-parameter-type
1032 -Wold-style-declaration, -Woverride-init and -Wignored-qualifiers
1033 but not if explicitly overridden. */
1034 if (warn_type_limits
== -1)
1035 warn_type_limits
= extra_warnings
;
1036 if (warn_clobbered
== -1)
1037 warn_clobbered
= extra_warnings
;
1038 if (warn_empty_body
== -1)
1039 warn_empty_body
= extra_warnings
;
1040 if (warn_sign_compare
== -1)
1041 warn_sign_compare
= extra_warnings
;
1042 if (warn_missing_field_initializers
== -1)
1043 warn_missing_field_initializers
= extra_warnings
;
1044 if (warn_missing_parameter_type
== -1)
1045 warn_missing_parameter_type
= extra_warnings
;
1046 if (warn_old_style_declaration
== -1)
1047 warn_old_style_declaration
= extra_warnings
;
1048 if (warn_override_init
== -1)
1049 warn_override_init
= extra_warnings
;
1050 if (warn_ignored_qualifiers
== -1)
1051 warn_ignored_qualifiers
= extra_warnings
;
1053 /* -Wpointer_sign is disabled by default, but it is enabled if any
1054 of -Wall or -pedantic are given. */
1055 if (warn_pointer_sign
== -1)
1056 warn_pointer_sign
= 0;
1058 if (warn_strict_aliasing
== -1)
1059 warn_strict_aliasing
= 0;
1060 if (warn_strict_overflow
== -1)
1061 warn_strict_overflow
= 0;
1063 /* -Woverlength-strings is off by default, but is enabled by -pedantic.
1064 It is never enabled in C++, as the minimum limit is not normative
1065 in that standard. */
1066 if (warn_overlength_strings
== -1 || c_dialect_cxx ())
1067 warn_overlength_strings
= 0;
1069 /* Wmain is enabled by default in C++ but not in C. */
1070 /* Wmain is disabled by default for -ffreestanding (!flag_hosted),
1071 even if -Wall was given (warn_main will be 2 if set by -Wall, 1
1072 if set by -Wmain). */
1073 if (warn_main
== -1)
1074 warn_main
= (c_dialect_cxx () && flag_hosted
) ? 1 : 0;
1075 else if (warn_main
== 2)
1076 warn_main
= flag_hosted
? 1 : 0;
1078 /* In C, -Wconversion enables -Wsign-conversion (unless disabled
1079 through -Wno-sign-conversion). While in C++,
1080 -Wsign-conversion needs to be requested explicitly. */
1081 if (warn_sign_conversion
== -1)
1082 warn_sign_conversion
= (c_dialect_cxx ()) ? 0 : warn_conversion
;
1085 /* Special format checking options don't work without -Wformat; warn if
1089 warning (OPT_Wformat_y2k
,
1090 "-Wformat-y2k ignored without -Wformat");
1091 warning (OPT_Wformat_extra_args
,
1092 "-Wformat-extra-args ignored without -Wformat");
1093 warning (OPT_Wformat_zero_length
,
1094 "-Wformat-zero-length ignored without -Wformat");
1095 warning (OPT_Wformat_nonliteral
,
1096 "-Wformat-nonliteral ignored without -Wformat");
1097 warning (OPT_Wformat_contains_nul
,
1098 "-Wformat-contains-nul ignored without -Wformat");
1099 warning (OPT_Wformat_security
,
1100 "-Wformat-security ignored without -Wformat");
1103 /* -Wimplicit-function-declaration is enabled by default for C99. */
1104 if (warn_implicit_function_declaration
== -1)
1105 warn_implicit_function_declaration
= flag_isoc99
;
1107 /* If we're allowing C++0x constructs, don't warn about C++0x
1108 compatibility problems. */
1109 if (cxx_dialect
== cxx0x
)
1110 warn_cxx0x_compat
= 0;
1112 if (flag_preprocess_only
)
1114 /* Open the output now. We must do so even if flag_no_output is
1115 on, because there may be other output than from the actual
1116 preprocessing (e.g. from -dM). */
1117 if (out_fname
[0] == '\0')
1118 out_stream
= stdout
;
1120 out_stream
= fopen (out_fname
, "w");
1122 if (out_stream
== NULL
)
1124 fatal_error ("opening output file %s: %m", out_fname
);
1128 if (num_in_fnames
> 1)
1129 error ("too many filenames given. Type %s --help for usage",
1132 init_pp_output (out_stream
);
1138 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1139 input_location
= UNKNOWN_LOCATION
;
1142 cb
= cpp_get_callbacks (parse_in
);
1143 cb
->file_change
= cb_file_change
;
1144 cb
->dir_change
= cb_dir_change
;
1145 cpp_post_options (parse_in
);
1147 input_location
= UNKNOWN_LOCATION
;
1149 /* If an error has occurred in cpplib, note it so we fail
1151 errorcount
+= cpp_errors (parse_in
);
1153 *pfilename
= this_input_filename
1154 = cpp_read_main_file (parse_in
, in_fnames
[0]);
1155 /* Don't do any compilation or preprocessing if there is no input file. */
1156 if (this_input_filename
== NULL
)
1162 if (flag_working_directory
1163 && flag_preprocess_only
&& !flag_no_line_commands
)
1164 pp_dir_change (parse_in
, get_src_pwd ());
1166 return flag_preprocess_only
;
1169 /* Front end initialization common to C, ObjC and C++. */
1171 c_common_init (void)
1173 /* Set up preprocessor arithmetic. Must be done after call to
1174 c_common_nodes_and_builtins for type nodes to be good. */
1175 cpp_opts
->precision
= TYPE_PRECISION (intmax_type_node
);
1176 cpp_opts
->char_precision
= TYPE_PRECISION (char_type_node
);
1177 cpp_opts
->int_precision
= TYPE_PRECISION (integer_type_node
);
1178 cpp_opts
->wchar_precision
= TYPE_PRECISION (wchar_type_node
);
1179 cpp_opts
->unsigned_wchar
= TYPE_UNSIGNED (wchar_type_node
);
1180 cpp_opts
->bytes_big_endian
= BYTES_BIG_ENDIAN
;
1182 /* This can't happen until after wchar_precision and bytes_big_endian
1184 cpp_init_iconv (parse_in
);
1187 c_common_print_pch_checksum (stderr
);
1189 /* Has to wait until now so that cpplib has its hash table. */
1192 if (flag_preprocess_only
)
1195 preprocess_file (parse_in
);
1202 /* Initialize the integrated preprocessor after debug output has been
1203 initialized; loop over each input file. */
1205 c_common_parse_file (int set_yydebug
)
1213 warning(0, "The C parser does not support -dy, option ignored");
1217 "The Objective-C parser does not support -dy, option ignored");
1220 warning(0, "The C++ parser does not support -dy, option ignored");
1224 "The Objective-C++ parser does not support -dy, option ignored");
1233 /* Start the main input file, if the debug writer wants it. */
1234 if (debug_hooks
->start_end_main_source_file
)
1235 (*debug_hooks
->start_source_file
) (0, this_input_filename
);
1242 /* And end the main input file, if the debug writer wants it */
1243 if (debug_hooks
->start_end_main_source_file
)
1244 (*debug_hooks
->end_source_file
) (0);
1245 if (++i
>= num_in_fnames
)
1247 cpp_undef_all (parse_in
);
1248 cpp_clear_file_cache (parse_in
);
1250 = cpp_read_main_file (parse_in
, in_fnames
[i
]);
1251 /* If an input file is missing, abandon further compilation.
1252 cpplib has issued a diagnostic. */
1253 if (!this_input_filename
)
1258 /* Common finish hook for the C, ObjC and C++ front ends. */
1260 c_common_finish (void)
1262 FILE *deps_stream
= NULL
;
1264 if (cpp_opts
->deps
.style
!= DEPS_NONE
)
1266 /* If -M or -MM was seen without -MF, default output to the
1269 deps_stream
= out_stream
;
1272 deps_stream
= fopen (deps_file
, deps_append
? "a": "w");
1274 fatal_error ("opening dependency file %s: %m", deps_file
);
1278 /* For performance, avoid tearing down cpplib's internal structures
1279 with cpp_destroy (). */
1280 errorcount
+= cpp_finish (parse_in
, deps_stream
);
1282 if (deps_stream
&& deps_stream
!= out_stream
1283 && (ferror (deps_stream
) || fclose (deps_stream
)))
1284 fatal_error ("closing dependency file %s: %m", deps_file
);
1286 if (out_stream
&& (ferror (out_stream
) || fclose (out_stream
)))
1287 fatal_error ("when writing output to %s: %m", out_fname
);
1290 /* Either of two environment variables can specify output of
1291 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1292 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1293 and DEPS_TARGET is the target to mention in the deps. They also
1294 result in dependency information being appended to the output file
1295 rather than overwriting it, and like Sun's compiler
1296 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1298 check_deps_environment_vars (void)
1302 GET_ENVIRONMENT (spec
, "DEPENDENCIES_OUTPUT");
1304 cpp_opts
->deps
.style
= DEPS_USER
;
1307 GET_ENVIRONMENT (spec
, "SUNPRO_DEPENDENCIES");
1310 cpp_opts
->deps
.style
= DEPS_SYSTEM
;
1311 cpp_opts
->deps
.ignore_main_file
= true;
1317 /* Find the space before the DEPS_TARGET, if there is one. */
1318 char *s
= strchr (spec
, ' ');
1321 /* Let the caller perform MAKE quoting. */
1322 defer_opt (OPT_MT
, s
+ 1);
1326 /* Command line -MF overrides environment variables and default. */
1335 /* Handle deferred command line switches. */
1337 handle_deferred_opts (void)
1342 /* Avoid allocating the deps buffer if we don't need it.
1343 (This flag may be true without there having been -MT or -MQ
1344 options, but we'll still need the deps buffer.) */
1348 deps
= cpp_get_deps (parse_in
);
1350 for (i
= 0; i
< deferred_count
; i
++)
1352 struct deferred_opt
*opt
= &deferred_opts
[i
];
1354 if (opt
->code
== OPT_MT
|| opt
->code
== OPT_MQ
)
1355 deps_add_target (deps
, opt
->arg
, opt
->code
== OPT_MQ
);
1359 /* These settings are appropriate for GCC, but not necessarily so for
1360 cpplib as a library. */
1362 sanitize_cpp_opts (void)
1364 /* If we don't know what style of dependencies to output, complain
1365 if any other dependency switches have been given. */
1366 if (deps_seen
&& cpp_opts
->deps
.style
== DEPS_NONE
)
1367 error ("to generate dependencies you must specify either -M or -MM");
1369 /* -dM and dependencies suppress normal output; do it here so that
1370 the last -d[MDN] switch overrides earlier ones. */
1371 if (flag_dump_macros
== 'M')
1374 /* By default, -fdirectives-only implies -dD. This allows subsequent phases
1375 to perform proper macro expansion. */
1376 if (cpp_opts
->directives_only
&& !cpp_opts
->preprocessed
&& !flag_dump_macros
)
1377 flag_dump_macros
= 'D';
1379 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1380 -dM since at least glibc relies on -M -dM to work. */
1381 /* Also, flag_no_output implies flag_no_line_commands, always. */
1384 if (flag_dump_macros
!= 'M')
1385 flag_dump_macros
= 0;
1386 flag_dump_includes
= 0;
1387 flag_no_line_commands
= 1;
1389 else if (cpp_opts
->deps
.missing_files
)
1390 error ("-MG may only be used with -M or -MM");
1392 cpp_opts
->unsigned_char
= !flag_signed_char
;
1393 cpp_opts
->stdc_0_in_system_headers
= STDC_0_IN_SYSTEM_HEADERS
;
1395 /* We want -Wno-long-long to override -pedantic -std=non-c99
1396 and/or -Wtraditional, whatever the ordering. */
1397 cpp_opts
->warn_long_long
1398 = warn_long_long
&& ((pedantic
1399 && (c_dialect_cxx ()
1400 ? cxx_dialect
== cxx98
1402 || warn_traditional
);
1404 /* Similarly with -Wno-variadic-macros. No check for c99 here, since
1405 this also turns off warnings about GCCs extension. */
1406 cpp_opts
->warn_variadic_macros
1407 = warn_variadic_macros
&& (pedantic
|| warn_traditional
);
1409 /* If we're generating preprocessor output, emit current directory
1410 if explicitly requested or if debugging information is enabled.
1411 ??? Maybe we should only do it for debugging formats that
1412 actually output the current directory? */
1413 if (flag_working_directory
== -1)
1414 flag_working_directory
= (debug_info_level
!= DINFO_LEVEL_NONE
);
1416 if (cpp_opts
->directives_only
)
1418 if (warn_unused_macros
)
1419 error ("-fdirectives-only is incompatible with -Wunused_macros");
1420 if (cpp_opts
->traditional
)
1421 error ("-fdirectives-only is incompatible with -traditional");
1425 /* Add include path with a prefix at the front of its name. */
1427 add_prefixed_path (const char *suffix
, size_t chain
)
1431 size_t prefix_len
, suffix_len
;
1433 suffix_len
= strlen (suffix
);
1434 prefix
= iprefix
? iprefix
: cpp_GCC_INCLUDE_DIR
;
1435 prefix_len
= iprefix
? strlen (iprefix
) : cpp_GCC_INCLUDE_DIR_len
;
1437 path
= (char *) xmalloc (prefix_len
+ suffix_len
+ 1);
1438 memcpy (path
, prefix
, prefix_len
);
1439 memcpy (path
+ prefix_len
, suffix
, suffix_len
);
1440 path
[prefix_len
+ suffix_len
] = '\0';
1442 add_path (path
, chain
, 0, false);
1445 /* Handle -D, -U, -A, -imacros, and the first -include. */
1447 finish_options (void)
1449 if (!cpp_opts
->preprocessed
)
1453 cb_file_change (parse_in
,
1454 linemap_add (line_table
, LC_RENAME
, 0,
1455 _("<built-in>"), 0));
1457 cpp_init_builtins (parse_in
, flag_hosted
);
1458 c_cpp_builtins (parse_in
);
1460 /* We're about to send user input to cpplib, so make it warn for
1461 things that we previously (when we sent it internal definitions)
1462 told it to not warn.
1464 C99 permits implementation-defined characters in identifiers.
1465 The documented meaning of -std= is to turn off extensions that
1466 conflict with the specified standard, and since a strictly
1467 conforming program cannot contain a '$', we do not condition
1468 their acceptance on the -std= setting. */
1469 cpp_opts
->warn_dollars
= (cpp_opts
->pedantic
&& !cpp_opts
->c99
);
1471 cb_file_change (parse_in
,
1472 linemap_add (line_table
, LC_RENAME
, 0,
1473 _("<command-line>"), 0));
1475 for (i
= 0; i
< deferred_count
; i
++)
1477 struct deferred_opt
*opt
= &deferred_opts
[i
];
1479 if (opt
->code
== OPT_D
)
1480 cpp_define (parse_in
, opt
->arg
);
1481 else if (opt
->code
== OPT_U
)
1482 cpp_undef (parse_in
, opt
->arg
);
1483 else if (opt
->code
== OPT_A
)
1485 if (opt
->arg
[0] == '-')
1486 cpp_unassert (parse_in
, opt
->arg
+ 1);
1488 cpp_assert (parse_in
, opt
->arg
);
1492 /* Handle -imacros after -D and -U. */
1493 for (i
= 0; i
< deferred_count
; i
++)
1495 struct deferred_opt
*opt
= &deferred_opts
[i
];
1497 if (opt
->code
== OPT_imacros
1498 && cpp_push_include (parse_in
, opt
->arg
))
1500 /* Disable push_command_line_include callback for now. */
1501 include_cursor
= deferred_count
+ 1;
1502 cpp_scan_nooutput (parse_in
);
1506 else if (cpp_opts
->directives_only
)
1507 cpp_init_special_builtins (parse_in
);
1510 push_command_line_include ();
1513 /* Give CPP the next file given by -include, if any. */
1515 push_command_line_include (void)
1517 while (include_cursor
< deferred_count
)
1519 struct deferred_opt
*opt
= &deferred_opts
[include_cursor
++];
1521 if (!cpp_opts
->preprocessed
&& opt
->code
== OPT_include
1522 && cpp_push_include (parse_in
, opt
->arg
))
1526 if (include_cursor
== deferred_count
)
1529 /* -Wunused-macros should only warn about macros defined hereafter. */
1530 cpp_opts
->warn_unused_macros
= warn_unused_macros
;
1531 /* Restore the line map from <command line>. */
1532 if (!cpp_opts
->preprocessed
)
1533 cpp_change_file (parse_in
, LC_RENAME
, this_input_filename
);
1535 /* Set this here so the client can change the option if it wishes,
1536 and after stacking the main file so we don't trace the main file. */
1537 line_table
->trace_includes
= cpp_opts
->print_include_names
;
1541 /* File change callback. Has to handle -include files. */
1543 cb_file_change (cpp_reader
* ARG_UNUSED (pfile
),
1544 const struct line_map
*new_map
)
1546 if (flag_preprocess_only
)
1547 pp_file_change (new_map
);
1549 fe_file_change (new_map
);
1551 if (new_map
== 0 || (new_map
->reason
== LC_LEAVE
&& MAIN_FILE_P (new_map
)))
1552 push_command_line_include ();
1556 cb_dir_change (cpp_reader
* ARG_UNUSED (pfile
), const char *dir
)
1558 if (!set_src_pwd (dir
))
1559 warning (0, "too late for # directive to set debug directory");
1562 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1563 extensions if ISO). There is no concept of gnu94. */
1565 set_std_c89 (int c94
, int iso
)
1567 cpp_set_lang (parse_in
, c94
? CLK_STDC94
: iso
? CLK_STDC89
: CLK_GNUC89
);
1570 flag_no_gnu_keywords
= iso
;
1571 flag_no_nonansi_builtin
= iso
;
1576 /* Set the C 99 standard (without GNU extensions if ISO). */
1578 set_std_c99 (int iso
)
1580 cpp_set_lang (parse_in
, iso
? CLK_STDC99
: CLK_GNUC99
);
1582 flag_no_nonansi_builtin
= iso
;
1588 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1590 set_std_cxx98 (int iso
)
1592 cpp_set_lang (parse_in
, iso
? CLK_CXX98
: CLK_GNUCXX
);
1593 flag_no_gnu_keywords
= iso
;
1594 flag_no_nonansi_builtin
= iso
;
1596 cxx_dialect
= cxx98
;
1599 /* Set the C++ 0x working draft "standard" (without GNU extensions if ISO). */
1601 set_std_cxx0x (int iso
)
1603 cpp_set_lang (parse_in
, iso
? CLK_CXX0X
: CLK_GNUCXX0X
);
1604 flag_no_gnu_keywords
= iso
;
1605 flag_no_nonansi_builtin
= iso
;
1607 cxx_dialect
= cxx0x
;
1610 /* Handle setting implicit to ON. */
1612 set_Wimplicit (int on
)
1615 warn_implicit_int
= on
;
1616 warn_implicit_function_declaration
= on
;
1619 /* Args to -d specify what to dump. Silently ignore
1620 unrecognized options; they may be aimed at toplev.c. */
1622 handle_OPT_d (const char *arg
)
1626 while ((c
= *arg
++) != '\0')
1629 case 'M': /* Dump macros only. */
1630 case 'N': /* Dump names. */
1631 case 'D': /* Dump definitions. */
1632 case 'U': /* Dump used macros. */
1633 flag_dump_macros
= c
;
1637 flag_dump_includes
= 1;