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 static 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 ("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 ())
407 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding
408 can turn it off only if it's not explicit. */
409 warn_main
= value
* 2;
412 /* C++-specific warnings. */
413 warn_sign_compare
= value
;
414 warn_reorder
= value
;
415 warn_cxx0x_compat
= value
;
418 cpp_opts
->warn_trigraphs
= value
;
419 cpp_opts
->warn_comments
= value
;
420 cpp_opts
->warn_num_sign_change
= value
;
422 if (warn_pointer_sign
== -1)
423 warn_pointer_sign
= 1;
428 cpp_opts
->warn_comments
= value
;
431 case OPT_Wdeprecated
:
432 cpp_opts
->warn_deprecated
= value
;
435 case OPT_Wendif_labels
:
436 cpp_opts
->warn_endif_labels
= value
;
440 cpp_opts
->warnings_are_errors
= value
;
441 global_dc
->warning_as_error_requested
= value
;
444 case OPT_Werror_implicit_function_declaration
:
445 /* For backward compatibility, this is the same as
446 -Werror=implicit-function-declaration. */
447 enable_warning_as_error ("implicit-function-declaration", value
, CL_C
| CL_ObjC
);
455 set_Wformat (atoi (arg
));
459 set_Wimplicit (value
);
463 /* Silently ignore for now. */
466 case OPT_Winvalid_pch
:
467 cpp_opts
->warn_invalid_pch
= value
;
477 case OPT_Wmissing_include_dirs
:
478 cpp_opts
->warn_missing_include_dirs
= value
;
482 cpp_opts
->warn_multichar
= value
;
485 case OPT_Wnormalized_
:
486 if (!value
|| (arg
&& strcasecmp (arg
, "none") == 0))
487 cpp_opts
->warn_normalize
= normalized_none
;
488 else if (!arg
|| strcasecmp (arg
, "nfkc") == 0)
489 cpp_opts
->warn_normalize
= normalized_KC
;
490 else if (strcasecmp (arg
, "id") == 0)
491 cpp_opts
->warn_normalize
= normalized_identifier_C
;
492 else if (strcasecmp (arg
, "nfc") == 0)
493 cpp_opts
->warn_normalize
= normalized_C
;
495 error ("argument %qs to %<-Wnormalized%> not recognized", arg
);
498 case OPT_Wreturn_type
:
499 warn_return_type
= value
;
502 case OPT_Wstrict_null_sentinel
:
503 warn_strict_null_sentinel
= value
;
506 case OPT_Wsystem_headers
:
507 cpp_opts
->warn_system_headers
= value
;
510 case OPT_Wtraditional
:
511 cpp_opts
->warn_traditional
= value
;
515 cpp_opts
->warn_trigraphs
= value
;
519 cpp_opts
->warn_undef
= value
;
522 case OPT_Wunknown_pragmas
:
523 /* Set to greater than 1, so that even unknown pragmas in
524 system headers will be warned about. */
525 warn_unknown_pragmas
= value
* 2;
528 case OPT_Wunused_macros
:
529 warn_unused_macros
= value
;
532 case OPT_Wvariadic_macros
:
533 warn_variadic_macros
= value
;
536 case OPT_Wwrite_strings
:
537 warn_write_strings
= value
;
543 warn_nonvdtor
= true;
547 if (!c_dialect_cxx ())
548 set_std_c89 (false, true);
550 set_std_cxx98 (true);
557 case OPT_fcond_mismatch
:
558 if (!c_dialect_cxx ())
560 flag_cond_mismatch
= value
;
565 case OPT_fall_virtual
:
566 case OPT_falt_external_templates
:
567 case OPT_fenum_int_equiv
:
568 case OPT_fexternal_templates
:
569 case OPT_fguiding_decls
:
571 case OPT_fhuge_objects
:
573 case OPT_fname_mangling_version_
:
575 case OPT_fnonnull_objects
:
577 case OPT_fstrict_prototype
:
578 case OPT_fthis_is_variable
:
579 case OPT_fvtable_thunks
:
582 warning (0, "switch %qs is no longer supported", option
->opt_text
);
585 case OPT_faccess_control
:
586 flag_access_control
= value
;
590 flag_no_asm
= !value
;
594 flag_no_builtin
= !value
;
601 disable_builtin_function (arg
);
604 case OPT_fdirectives_only
:
605 cpp_opts
->directives_only
= value
;
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_flax_vector_conversions
:
709 flag_lax_vector_conversions
= value
;
712 case OPT_fms_extensions
:
713 flag_ms_extensions
= value
;
716 case OPT_fnext_runtime
:
717 flag_next_runtime
= value
;
720 case OPT_fnil_receivers
:
721 flag_nil_receivers
= value
;
724 case OPT_fnonansi_builtins
:
725 flag_no_nonansi_builtin
= !value
;
728 case OPT_foperator_names
:
729 cpp_opts
->operator_names
= value
;
732 case OPT_foptional_diags
:
733 flag_optional_diags
= value
;
737 cpp_opts
->restore_pch_deps
= value
;
740 case OPT_fpch_preprocess
:
741 flag_pch_preprocess
= value
;
744 case OPT_fpermissive
:
745 flag_permissive
= value
;
748 case OPT_fpreprocessed
:
749 cpp_opts
->preprocessed
= value
;
752 case OPT_freplace_objc_classes
:
753 flag_replace_objc_classes
= value
;
757 flag_use_repository
= value
;
759 flag_implicit_templates
= 0;
766 case OPT_fshow_column
:
767 cpp_opts
->show_column
= value
;
771 flag_detailed_statistics
= value
;
775 /* It is documented that we silently ignore silly values. */
776 if (value
>= 1 && value
<= 100)
777 cpp_opts
->tabstop
= value
;
780 case OPT_fexec_charset_
:
781 cpp_opts
->narrow_charset
= arg
;
784 case OPT_fwide_exec_charset_
:
785 cpp_opts
->wide_charset
= arg
;
788 case OPT_finput_charset_
:
789 cpp_opts
->input_charset
= arg
;
792 case OPT_ftemplate_depth_
:
793 max_tinst_depth
= value
;
796 case OPT_fuse_cxa_atexit
:
797 flag_use_cxa_atexit
= value
;
800 case OPT_fuse_cxa_get_exception_ptr
:
801 flag_use_cxa_get_exception_ptr
= value
;
804 case OPT_fvisibility_inlines_hidden
:
805 visibility_options
.inlines_hidden
= value
;
812 case OPT_fthreadsafe_statics
:
813 flag_threadsafe_statics
= value
;
817 flag_zero_link
= value
;
821 flag_gen_declaration
= 1;
824 case OPT_femit_struct_debug_baseonly
:
825 set_struct_debug_option ("base");
828 case OPT_femit_struct_debug_reduced
:
829 set_struct_debug_option ("dir:ord:sys,dir:gen:any,ind:base");
832 case OPT_femit_struct_debug_detailed_
:
833 set_struct_debug_option (arg
);
837 add_path (xstrdup (arg
), AFTER
, 0, true);
842 defer_opt (code
, arg
);
854 add_path (xstrdup (arg
), QUOTE
, 0, true);
862 add_path (xstrdup (arg
), SYSTEM
, 0, true);
865 case OPT_iwithprefix
:
866 add_prefixed_path (arg
, SYSTEM
);
869 case OPT_iwithprefixbefore
:
870 add_prefixed_path (arg
, BRACKET
);
874 cpp_set_lang (parse_in
, CLK_ASM
);
875 cpp_opts
->dollars_in_ident
= false;
894 error ("output filename specified twice");
897 /* We need to handle the -pedantic switches here, rather than in
898 c_common_post_options, so that a subsequent -Wno-endif-labels
899 is not overridden. */
900 case OPT_pedantic_errors
:
901 cpp_opts
->pedantic_errors
= 1;
904 cpp_opts
->pedantic
= 1;
905 cpp_opts
->warn_endif_labels
= 1;
906 if (warn_pointer_sign
== -1)
907 warn_pointer_sign
= 1;
908 if (warn_overlength_strings
== -1)
909 warn_overlength_strings
= 1;
912 case OPT_print_objc_runtime_info
:
913 print_struct_values
= 1;
916 case OPT_print_pch_checksum
:
917 c_common_print_pch_checksum (stdout
);
918 exit_after_options
= true;
926 case OPT_std_gnu__98
:
927 if (!preprocessing_asm_p
)
928 set_std_cxx98 (code
== OPT_std_c__98
/* ISO */);
932 case OPT_std_gnu__0x
:
933 if (!preprocessing_asm_p
)
934 set_std_cxx0x (code
== OPT_std_c__0x
/* ISO */);
938 case OPT_std_iso9899_1990
:
939 case OPT_std_iso9899_199409
:
940 if (!preprocessing_asm_p
)
941 set_std_c89 (code
== OPT_std_iso9899_199409
/* c94 */, true /* ISO */);
945 if (!preprocessing_asm_p
)
946 set_std_c89 (false /* c94 */, false /* ISO */);
951 case OPT_std_iso9899_1999
:
952 case OPT_std_iso9899_199x
:
953 if (!preprocessing_asm_p
)
954 set_std_c99 (true /* ISO */);
959 if (!preprocessing_asm_p
)
960 set_std_c99 (false /* ISO */);
964 cpp_opts
->trigraphs
= 1;
967 case OPT_traditional_cpp
:
968 cpp_opts
->traditional
= 1;
976 cpp_opts
->inhibit_warnings
= 1;
987 /* Post-switch processing. */
989 c_common_post_options (const char **pfilename
)
991 struct cpp_callbacks
*cb
;
993 /* Canonicalize the input and output filenames. */
994 if (in_fnames
== NULL
)
996 in_fnames
= XNEWVEC (const char *, 1);
999 else if (strcmp (in_fnames
[0], "-") == 0)
1002 if (out_fname
== NULL
|| !strcmp (out_fname
, "-"))
1005 if (cpp_opts
->deps
.style
== DEPS_NONE
)
1006 check_deps_environment_vars ();
1008 handle_deferred_opts ();
1010 sanitize_cpp_opts ();
1012 register_include_chains (parse_in
, sysroot
, iprefix
, imultilib
,
1013 std_inc
, std_cxx_inc
&& c_dialect_cxx (), verbose
);
1015 #ifdef C_COMMON_OVERRIDE_OPTIONS
1016 /* Some machines may reject certain combinations of C
1017 language-specific options. */
1018 C_COMMON_OVERRIDE_OPTIONS
;
1021 /* Use tree inlining. */
1022 if (!flag_no_inline
)
1025 /* By default we use C99 inline semantics in GNU99 or C99 mode. C99
1026 inline semantics are not supported in GNU89 or C89 mode. */
1027 if (flag_gnu89_inline
== -1)
1028 flag_gnu89_inline
= !flag_isoc99
;
1029 else if (!flag_gnu89_inline
&& !flag_isoc99
)
1030 error ("-fno-gnu89-inline is only supported in GNU99 or C99 mode");
1032 /* Default to ObjC sjlj exception handling if NeXT runtime. */
1033 if (flag_objc_sjlj_exceptions
< 0)
1034 flag_objc_sjlj_exceptions
= flag_next_runtime
;
1035 if (flag_objc_exceptions
&& !flag_objc_sjlj_exceptions
)
1036 flag_exceptions
= 1;
1038 /* -Wextra implies -Wtype-limits, -Wclobbered,
1039 -Wempty-body, -Wsign-compare,
1040 -Wmissing-field-initializers, -Wmissing-parameter-type
1041 -Wold-style-declaration, -Woverride-init and -Wignored-qualifiers
1042 but not if explicitly overridden. */
1043 if (warn_type_limits
== -1)
1044 warn_type_limits
= extra_warnings
;
1045 if (warn_clobbered
== -1)
1046 warn_clobbered
= extra_warnings
;
1047 if (warn_empty_body
== -1)
1048 warn_empty_body
= extra_warnings
;
1049 if (warn_sign_compare
== -1)
1050 warn_sign_compare
= extra_warnings
;
1051 if (warn_missing_field_initializers
== -1)
1052 warn_missing_field_initializers
= extra_warnings
;
1053 if (warn_missing_parameter_type
== -1)
1054 warn_missing_parameter_type
= extra_warnings
;
1055 if (warn_old_style_declaration
== -1)
1056 warn_old_style_declaration
= extra_warnings
;
1057 if (warn_override_init
== -1)
1058 warn_override_init
= extra_warnings
;
1059 if (warn_ignored_qualifiers
== -1)
1060 warn_ignored_qualifiers
= extra_warnings
;
1062 /* -Wpointer_sign is disabled by default, but it is enabled if any
1063 of -Wall or -pedantic are given. */
1064 if (warn_pointer_sign
== -1)
1065 warn_pointer_sign
= 0;
1067 if (warn_strict_aliasing
== -1)
1068 warn_strict_aliasing
= 0;
1069 if (warn_strict_overflow
== -1)
1070 warn_strict_overflow
= 0;
1072 /* -Woverlength-strings is off by default, but is enabled by -pedantic.
1073 It is never enabled in C++, as the minimum limit is not normative
1074 in that standard. */
1075 if (warn_overlength_strings
== -1 || c_dialect_cxx ())
1076 warn_overlength_strings
= 0;
1078 /* Adjust various flags for C++ based on command-line settings. */
1079 if (c_dialect_cxx ())
1081 if (!flag_no_inline
)
1085 /* In C, -Wconversion enables -Wsign-conversion (unless disabled
1086 through -Wno-sign-conversion). While in C++,
1087 -Wsign-conversion needs to be requested explicitly. */
1088 if (warn_sign_conversion
== -1)
1089 warn_sign_conversion
= (c_dialect_cxx ()) ? 0 : warn_conversion
;
1092 /* Special format checking options don't work without -Wformat; warn if
1096 warning (OPT_Wformat_y2k
,
1097 "-Wformat-y2k ignored without -Wformat");
1098 warning (OPT_Wformat_extra_args
,
1099 "-Wformat-extra-args ignored without -Wformat");
1100 warning (OPT_Wformat_zero_length
,
1101 "-Wformat-zero-length ignored without -Wformat");
1102 warning (OPT_Wformat_nonliteral
,
1103 "-Wformat-nonliteral ignored without -Wformat");
1104 warning (OPT_Wformat_contains_nul
,
1105 "-Wformat-contains-nul ignored without -Wformat");
1106 warning (OPT_Wformat_security
,
1107 "-Wformat-security ignored without -Wformat");
1110 /* -Wimplicit-function-declaration is enabled by default for C99. */
1111 if (warn_implicit_function_declaration
== -1)
1112 warn_implicit_function_declaration
= flag_isoc99
;
1114 /* If we're allowing C++0x constructs, don't warn about C++0x
1115 compatibility problems. */
1116 if (cxx_dialect
== cxx0x
)
1117 warn_cxx0x_compat
= 0;
1119 if (flag_preprocess_only
)
1121 /* Open the output now. We must do so even if flag_no_output is
1122 on, because there may be other output than from the actual
1123 preprocessing (e.g. from -dM). */
1124 if (out_fname
[0] == '\0')
1125 out_stream
= stdout
;
1127 out_stream
= fopen (out_fname
, "w");
1129 if (out_stream
== NULL
)
1131 fatal_error ("opening output file %s: %m", out_fname
);
1135 if (num_in_fnames
> 1)
1136 error ("too many filenames given. Type %s --help for usage",
1139 init_pp_output (out_stream
);
1145 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1146 input_location
= UNKNOWN_LOCATION
;
1149 cb
= cpp_get_callbacks (parse_in
);
1150 cb
->file_change
= cb_file_change
;
1151 cb
->dir_change
= cb_dir_change
;
1152 cpp_post_options (parse_in
);
1154 input_location
= UNKNOWN_LOCATION
;
1156 /* If an error has occurred in cpplib, note it so we fail
1158 errorcount
+= cpp_errors (parse_in
);
1160 *pfilename
= this_input_filename
1161 = cpp_read_main_file (parse_in
, in_fnames
[0]);
1162 /* Don't do any compilation or preprocessing if there is no input file. */
1163 if (this_input_filename
== NULL
)
1169 if (flag_working_directory
1170 && flag_preprocess_only
&& !flag_no_line_commands
)
1171 pp_dir_change (parse_in
, get_src_pwd ());
1173 return flag_preprocess_only
;
1176 /* Front end initialization common to C, ObjC and C++. */
1178 c_common_init (void)
1180 /* Set up preprocessor arithmetic. Must be done after call to
1181 c_common_nodes_and_builtins for type nodes to be good. */
1182 cpp_opts
->precision
= TYPE_PRECISION (intmax_type_node
);
1183 cpp_opts
->char_precision
= TYPE_PRECISION (char_type_node
);
1184 cpp_opts
->int_precision
= TYPE_PRECISION (integer_type_node
);
1185 cpp_opts
->wchar_precision
= TYPE_PRECISION (wchar_type_node
);
1186 cpp_opts
->unsigned_wchar
= TYPE_UNSIGNED (wchar_type_node
);
1187 cpp_opts
->bytes_big_endian
= BYTES_BIG_ENDIAN
;
1189 /* This can't happen until after wchar_precision and bytes_big_endian
1191 cpp_init_iconv (parse_in
);
1194 c_common_print_pch_checksum (stderr
);
1196 /* Has to wait until now so that cpplib has its hash table. */
1199 if (flag_preprocess_only
)
1202 preprocess_file (parse_in
);
1209 /* Initialize the integrated preprocessor after debug output has been
1210 initialized; loop over each input file. */
1212 c_common_parse_file (int set_yydebug
)
1220 warning(0, "The C parser does not support -dy, option ignored");
1224 "The Objective-C parser does not support -dy, option ignored");
1227 warning(0, "The C++ parser does not support -dy, option ignored");
1231 "The Objective-C++ parser does not support -dy, option ignored");
1240 /* Start the main input file, if the debug writer wants it. */
1241 if (debug_hooks
->start_end_main_source_file
)
1242 (*debug_hooks
->start_source_file
) (0, this_input_filename
);
1249 /* And end the main input file, if the debug writer wants it */
1250 if (debug_hooks
->start_end_main_source_file
)
1251 (*debug_hooks
->end_source_file
) (0);
1252 if (++i
>= num_in_fnames
)
1254 cpp_undef_all (parse_in
);
1255 cpp_clear_file_cache (parse_in
);
1257 = cpp_read_main_file (parse_in
, in_fnames
[i
]);
1258 /* If an input file is missing, abandon further compilation.
1259 cpplib has issued a diagnostic. */
1260 if (!this_input_filename
)
1265 /* Common finish hook for the C, ObjC and C++ front ends. */
1267 c_common_finish (void)
1269 FILE *deps_stream
= NULL
;
1271 if (cpp_opts
->deps
.style
!= DEPS_NONE
)
1273 /* If -M or -MM was seen without -MF, default output to the
1276 deps_stream
= out_stream
;
1279 deps_stream
= fopen (deps_file
, deps_append
? "a": "w");
1281 fatal_error ("opening dependency file %s: %m", deps_file
);
1285 /* For performance, avoid tearing down cpplib's internal structures
1286 with cpp_destroy (). */
1287 errorcount
+= cpp_finish (parse_in
, deps_stream
);
1289 if (deps_stream
&& deps_stream
!= out_stream
1290 && (ferror (deps_stream
) || fclose (deps_stream
)))
1291 fatal_error ("closing dependency file %s: %m", deps_file
);
1293 if (out_stream
&& (ferror (out_stream
) || fclose (out_stream
)))
1294 fatal_error ("when writing output to %s: %m", out_fname
);
1297 /* Either of two environment variables can specify output of
1298 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1299 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1300 and DEPS_TARGET is the target to mention in the deps. They also
1301 result in dependency information being appended to the output file
1302 rather than overwriting it, and like Sun's compiler
1303 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1305 check_deps_environment_vars (void)
1309 GET_ENVIRONMENT (spec
, "DEPENDENCIES_OUTPUT");
1311 cpp_opts
->deps
.style
= DEPS_USER
;
1314 GET_ENVIRONMENT (spec
, "SUNPRO_DEPENDENCIES");
1317 cpp_opts
->deps
.style
= DEPS_SYSTEM
;
1318 cpp_opts
->deps
.ignore_main_file
= true;
1324 /* Find the space before the DEPS_TARGET, if there is one. */
1325 char *s
= strchr (spec
, ' ');
1328 /* Let the caller perform MAKE quoting. */
1329 defer_opt (OPT_MT
, s
+ 1);
1333 /* Command line -MF overrides environment variables and default. */
1342 /* Handle deferred command line switches. */
1344 handle_deferred_opts (void)
1349 /* Avoid allocating the deps buffer if we don't need it.
1350 (This flag may be true without there having been -MT or -MQ
1351 options, but we'll still need the deps buffer.) */
1355 deps
= cpp_get_deps (parse_in
);
1357 for (i
= 0; i
< deferred_count
; i
++)
1359 struct deferred_opt
*opt
= &deferred_opts
[i
];
1361 if (opt
->code
== OPT_MT
|| opt
->code
== OPT_MQ
)
1362 deps_add_target (deps
, opt
->arg
, opt
->code
== OPT_MQ
);
1366 /* These settings are appropriate for GCC, but not necessarily so for
1367 cpplib as a library. */
1369 sanitize_cpp_opts (void)
1371 /* If we don't know what style of dependencies to output, complain
1372 if any other dependency switches have been given. */
1373 if (deps_seen
&& cpp_opts
->deps
.style
== DEPS_NONE
)
1374 error ("to generate dependencies you must specify either -M or -MM");
1376 /* -dM and dependencies suppress normal output; do it here so that
1377 the last -d[MDN] switch overrides earlier ones. */
1378 if (flag_dump_macros
== 'M')
1381 /* By default, -fdirectives-only implies -dD. This allows subsequent phases
1382 to perform proper macro expansion. */
1383 if (cpp_opts
->directives_only
&& !cpp_opts
->preprocessed
&& !flag_dump_macros
)
1384 flag_dump_macros
= 'D';
1386 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1387 -dM since at least glibc relies on -M -dM to work. */
1388 /* Also, flag_no_output implies flag_no_line_commands, always. */
1391 if (flag_dump_macros
!= 'M')
1392 flag_dump_macros
= 0;
1393 flag_dump_includes
= 0;
1394 flag_no_line_commands
= 1;
1396 else if (cpp_opts
->deps
.missing_files
)
1397 error ("-MG may only be used with -M or -MM");
1399 cpp_opts
->unsigned_char
= !flag_signed_char
;
1400 cpp_opts
->stdc_0_in_system_headers
= STDC_0_IN_SYSTEM_HEADERS
;
1402 /* We want -Wno-long-long to override -pedantic -std=non-c99
1403 and/or -Wtraditional, whatever the ordering. */
1404 cpp_opts
->warn_long_long
1405 = warn_long_long
&& ((pedantic
1406 && (c_dialect_cxx ()
1407 ? cxx_dialect
== cxx98
1409 || warn_traditional
);
1411 /* Similarly with -Wno-variadic-macros. No check for c99 here, since
1412 this also turns off warnings about GCCs extension. */
1413 cpp_opts
->warn_variadic_macros
1414 = warn_variadic_macros
&& (pedantic
|| warn_traditional
);
1416 /* If we're generating preprocessor output, emit current directory
1417 if explicitly requested or if debugging information is enabled.
1418 ??? Maybe we should only do it for debugging formats that
1419 actually output the current directory? */
1420 if (flag_working_directory
== -1)
1421 flag_working_directory
= (debug_info_level
!= DINFO_LEVEL_NONE
);
1423 if (cpp_opts
->directives_only
)
1425 if (warn_unused_macros
)
1426 error ("-fdirectives-only is incompatible with -Wunused_macros");
1427 if (cpp_opts
->traditional
)
1428 error ("-fdirectives-only is incompatible with -traditional");
1432 /* Add include path with a prefix at the front of its name. */
1434 add_prefixed_path (const char *suffix
, size_t chain
)
1438 size_t prefix_len
, suffix_len
;
1440 suffix_len
= strlen (suffix
);
1441 prefix
= iprefix
? iprefix
: cpp_GCC_INCLUDE_DIR
;
1442 prefix_len
= iprefix
? strlen (iprefix
) : cpp_GCC_INCLUDE_DIR_len
;
1444 path
= (char *) xmalloc (prefix_len
+ suffix_len
+ 1);
1445 memcpy (path
, prefix
, prefix_len
);
1446 memcpy (path
+ prefix_len
, suffix
, suffix_len
);
1447 path
[prefix_len
+ suffix_len
] = '\0';
1449 add_path (path
, chain
, 0, false);
1452 /* Handle -D, -U, -A, -imacros, and the first -include. */
1454 finish_options (void)
1456 if (!cpp_opts
->preprocessed
)
1460 cb_file_change (parse_in
,
1461 linemap_add (line_table
, LC_RENAME
, 0,
1462 _("<built-in>"), 0));
1464 cpp_init_builtins (parse_in
, flag_hosted
);
1465 c_cpp_builtins (parse_in
);
1467 /* We're about to send user input to cpplib, so make it warn for
1468 things that we previously (when we sent it internal definitions)
1469 told it to not warn.
1471 C99 permits implementation-defined characters in identifiers.
1472 The documented meaning of -std= is to turn off extensions that
1473 conflict with the specified standard, and since a strictly
1474 conforming program cannot contain a '$', we do not condition
1475 their acceptance on the -std= setting. */
1476 cpp_opts
->warn_dollars
= (cpp_opts
->pedantic
&& !cpp_opts
->c99
);
1478 cb_file_change (parse_in
,
1479 linemap_add (line_table
, LC_RENAME
, 0,
1480 _("<command-line>"), 0));
1482 for (i
= 0; i
< deferred_count
; i
++)
1484 struct deferred_opt
*opt
= &deferred_opts
[i
];
1486 if (opt
->code
== OPT_D
)
1487 cpp_define (parse_in
, opt
->arg
);
1488 else if (opt
->code
== OPT_U
)
1489 cpp_undef (parse_in
, opt
->arg
);
1490 else if (opt
->code
== OPT_A
)
1492 if (opt
->arg
[0] == '-')
1493 cpp_unassert (parse_in
, opt
->arg
+ 1);
1495 cpp_assert (parse_in
, opt
->arg
);
1499 /* Handle -imacros after -D and -U. */
1500 for (i
= 0; i
< deferred_count
; i
++)
1502 struct deferred_opt
*opt
= &deferred_opts
[i
];
1504 if (opt
->code
== OPT_imacros
1505 && cpp_push_include (parse_in
, opt
->arg
))
1507 /* Disable push_command_line_include callback for now. */
1508 include_cursor
= deferred_count
+ 1;
1509 cpp_scan_nooutput (parse_in
);
1513 else if (cpp_opts
->directives_only
)
1514 cpp_init_special_builtins (parse_in
);
1517 push_command_line_include ();
1520 /* Give CPP the next file given by -include, if any. */
1522 push_command_line_include (void)
1524 while (include_cursor
< deferred_count
)
1526 struct deferred_opt
*opt
= &deferred_opts
[include_cursor
++];
1528 if (!cpp_opts
->preprocessed
&& opt
->code
== OPT_include
1529 && cpp_push_include (parse_in
, opt
->arg
))
1533 if (include_cursor
== deferred_count
)
1536 /* -Wunused-macros should only warn about macros defined hereafter. */
1537 cpp_opts
->warn_unused_macros
= warn_unused_macros
;
1538 /* Restore the line map from <command line>. */
1539 if (!cpp_opts
->preprocessed
)
1540 cpp_change_file (parse_in
, LC_RENAME
, this_input_filename
);
1542 /* Set this here so the client can change the option if it wishes,
1543 and after stacking the main file so we don't trace the main file. */
1544 line_table
->trace_includes
= cpp_opts
->print_include_names
;
1548 /* File change callback. Has to handle -include files. */
1550 cb_file_change (cpp_reader
* ARG_UNUSED (pfile
),
1551 const struct line_map
*new_map
)
1553 if (flag_preprocess_only
)
1554 pp_file_change (new_map
);
1556 fe_file_change (new_map
);
1558 if (new_map
== 0 || (new_map
->reason
== LC_LEAVE
&& MAIN_FILE_P (new_map
)))
1559 push_command_line_include ();
1563 cb_dir_change (cpp_reader
* ARG_UNUSED (pfile
), const char *dir
)
1565 if (!set_src_pwd (dir
))
1566 warning (0, "too late for # directive to set debug directory");
1569 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1570 extensions if ISO). There is no concept of gnu94. */
1572 set_std_c89 (int c94
, int iso
)
1574 cpp_set_lang (parse_in
, c94
? CLK_STDC94
: iso
? CLK_STDC89
: CLK_GNUC89
);
1577 flag_no_gnu_keywords
= iso
;
1578 flag_no_nonansi_builtin
= iso
;
1583 /* Set the C 99 standard (without GNU extensions if ISO). */
1585 set_std_c99 (int iso
)
1587 cpp_set_lang (parse_in
, iso
? CLK_STDC99
: CLK_GNUC99
);
1589 flag_no_nonansi_builtin
= iso
;
1595 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1597 set_std_cxx98 (int iso
)
1599 cpp_set_lang (parse_in
, iso
? CLK_CXX98
: CLK_GNUCXX
);
1600 flag_no_gnu_keywords
= iso
;
1601 flag_no_nonansi_builtin
= iso
;
1603 cxx_dialect
= cxx98
;
1606 /* Set the C++ 0x working draft "standard" (without GNU extensions if ISO). */
1608 set_std_cxx0x (int iso
)
1610 cpp_set_lang (parse_in
, iso
? CLK_CXX0X
: CLK_GNUCXX0X
);
1611 flag_no_gnu_keywords
= iso
;
1612 flag_no_nonansi_builtin
= iso
;
1614 cxx_dialect
= cxx0x
;
1617 /* Handle setting implicit to ON. */
1619 set_Wimplicit (int on
)
1622 warn_implicit_int
= on
;
1623 warn_implicit_function_declaration
= on
;
1626 /* Args to -d specify what to dump. Silently ignore
1627 unrecognized options; they may be aimed at toplev.c. */
1629 handle_OPT_d (const char *arg
)
1633 while ((c
= *arg
++) != '\0')
1636 case 'M': /* Dump macros only. */
1637 case 'N': /* Dump names. */
1638 case 'D': /* Dump definitions. */
1639 case 'U': /* Dump used macros. */
1640 flag_dump_macros
= c
;
1644 flag_dump_includes
= 1;