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. */
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 /* If -lang-fortran seen. */
76 static bool lang_fortran
= false;
78 /* Dependency output file. */
79 static const char *deps_file
;
81 /* The prefix given by -iprefix, if any. */
82 static const char *iprefix
;
84 /* The multilib directory given by -imultilib, if any. */
85 static const char *imultilib
;
87 /* The system root, if any. Overridden by -isysroot. */
88 static const char *sysroot
= TARGET_SYSTEM_ROOT
;
90 /* Zero disables all standard directories for headers. */
91 static bool std_inc
= true;
93 /* Zero disables the C++-specific standard directories for headers. */
94 static bool std_cxx_inc
= true;
96 /* If the quote chain has been split by -I-. */
97 static bool quote_chain_split
;
99 /* If -Wunused-macros. */
100 static bool warn_unused_macros
;
102 /* If -Wvariadic-macros. */
103 static bool warn_variadic_macros
= true;
105 /* Number of deferred options. */
106 static size_t deferred_count
;
108 /* Number of deferred options scanned for -include. */
109 static size_t include_cursor
;
111 static void set_Wimplicit (int);
112 static void handle_OPT_d (const char *);
113 static void set_std_cxx98 (int);
114 static void set_std_cxx0x (int);
115 static void set_std_c89 (int, int);
116 static void set_std_c99 (int);
117 static void check_deps_environment_vars (void);
118 static void handle_deferred_opts (void);
119 static void sanitize_cpp_opts (void);
120 static void add_prefixed_path (const char *, size_t);
121 static void push_command_line_include (void);
122 static void cb_file_change (cpp_reader
*, const struct line_map
*);
123 static void cb_dir_change (cpp_reader
*, const char *);
124 static void finish_options (void);
126 #ifndef STDC_0_IN_SYSTEM_HEADERS
127 #define STDC_0_IN_SYSTEM_HEADERS 0
130 /* Holds switches parsed by c_common_handle_option (), but whose
131 handling is deferred to c_common_post_options (). */
132 static void defer_opt (enum opt_code
, const char *);
133 static struct deferred_opt
139 /* Complain that switch CODE expects an argument but none was
140 provided. OPT was the command-line option. Return FALSE to get
141 the default message in opts.c, TRUE if we provide a specialized
144 c_common_missing_argument (const char *opt
, size_t code
)
149 /* Pick up the default message. */
152 case OPT_fconstant_string_class_
:
153 error ("no class name specified with %qs", opt
);
157 error ("assertion missing after %qs", opt
);
162 error ("macro name missing after %qs", opt
);
171 error ("missing path after %qs", opt
);
180 error ("missing filename after %qs", opt
);
185 error ("missing makefile target after %qs", opt
);
192 /* Defer option CODE with argument ARG. */
194 defer_opt (enum opt_code code
, const char *arg
)
196 deferred_opts
[deferred_count
].code
= code
;
197 deferred_opts
[deferred_count
].arg
= arg
;
201 /* Common initialization before parsing options. */
203 c_common_init_options (unsigned int argc
, const char **argv
)
205 static const unsigned int lang_flags
[] = {CL_C
, CL_ObjC
, CL_CXX
, CL_ObjCXX
};
206 unsigned int i
, result
;
208 /* This is conditionalized only because that is the way the front
209 ends used to do it. Maybe this should be unconditional? */
210 if (c_dialect_cxx ())
212 /* By default wrap lines at 80 characters. Is getenv
213 ("COLUMNS") preferable? */
214 diagnostic_line_cutoff (global_dc
) = 80;
215 /* By default, emit location information once for every
216 diagnostic message. */
217 diagnostic_prefixing_rule (global_dc
) = DIAGNOSTICS_SHOW_PREFIX_ONCE
;
220 parse_in
= cpp_create_reader (c_dialect_cxx () ? CLK_GNUCXX
: CLK_GNUC89
,
221 ident_hash
, &line_table
);
223 cpp_opts
= cpp_get_options (parse_in
);
224 cpp_opts
->dollars_in_ident
= DOLLARS_IN_IDENTIFIERS
;
225 cpp_opts
->objc
= c_dialect_objc ();
227 /* Reset to avoid warnings on internal definitions. We set it just
228 before passing on command-line options to cpplib. */
229 cpp_opts
->warn_dollars
= 0;
231 flag_exceptions
= c_dialect_cxx ();
232 warn_pointer_arith
= c_dialect_cxx ();
233 warn_write_strings
= c_dialect_cxx();
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
;
251 for (i
= 1; i
< argc
; i
++)
252 if (! strcmp (argv
[i
], "-lang-fortran"))
254 result
|= CL_Fortran
;
263 /* Handle switch SCODE with argument ARG. VALUE is true, unless no-
264 form of an -f or -W option was given. Returns 0 if the switch was
265 invalid, a negative number to prevent language-independent
266 processing in toplev.c (a hack necessary for the short-term). */
268 c_common_handle_option (size_t scode
, const char *arg
, int value
)
270 const struct cl_option
*option
= &cl_options
[scode
];
271 enum opt_code code
= (enum opt_code
) scode
;
274 /* Prevent resetting the language standard to a C dialect when the driver
275 has already determined that we're looking at assembler input. */
276 bool preprocessing_asm_p
= (cpp_get_options (parse_in
)->lang
== CLK_ASM
);
281 if (cl_options
[code
].flags
& (CL_C
| CL_CXX
| CL_ObjC
| CL_ObjCXX
))
283 if ((option
->flags
& CL_TARGET
)
284 && ! targetcm
.handle_c_option (scode
, arg
, value
))
289 if (lang_fortran
&& (cl_options
[code
].flags
& (CL_Fortran
)))
295 case OPT__output_pch_
:
300 defer_opt (code
, arg
);
304 cpp_opts
->discard_comments
= 0;
308 cpp_opts
->discard_comments
= 0;
309 cpp_opts
->discard_comments_in_macro_exp
= 0;
313 defer_opt (code
, arg
);
317 flag_preprocess_only
= 1;
321 cpp_opts
->print_include_names
= 1;
325 TARGET_OPTF (xstrdup (arg
));
329 if (strcmp (arg
, "-"))
330 add_path (xstrdup (arg
), BRACKET
, 0, true);
333 if (quote_chain_split
)
334 error ("-I- specified twice");
335 quote_chain_split
= true;
336 split_quote_chain ();
337 inform ("obsolete option -I- used, please use -iquote instead");
343 /* When doing dependencies with -M or -MM, suppress normal
344 preprocessed output, but still do -dM etc. as software
345 depends on this. Preprocessed output does occur if -MD, -MMD
346 or environment var dependency generation is used. */
347 cpp_opts
->deps
.style
= (code
== OPT_M
? DEPS_SYSTEM
: DEPS_USER
);
349 cpp_opts
->inhibit_warnings
= 1;
354 cpp_opts
->deps
.style
= (code
== OPT_MD
? DEPS_SYSTEM
: DEPS_USER
);
365 cpp_opts
->deps
.missing_files
= true;
370 cpp_opts
->deps
.phony_targets
= true;
376 defer_opt (code
, arg
);
380 flag_no_line_commands
= 1;
383 case OPT_fworking_directory
:
384 flag_working_directory
= value
;
388 defer_opt (code
, arg
);
394 set_Wimplicit (value
);
395 warn_char_subscripts
= value
;
396 warn_missing_braces
= value
;
397 warn_parentheses
= value
;
398 warn_return_type
= value
;
399 warn_sequence_point
= value
; /* Was C only. */
400 if (c_dialect_cxx ())
401 warn_sign_compare
= value
;
403 warn_strict_aliasing
= value
;
404 warn_address
= value
;
405 warn_strict_overflow
= value
;
406 warn_array_bounds
= value
;
408 /* Only warn about unknown pragmas that are not in system
410 warn_unknown_pragmas
= value
;
412 /* We save the value of warn_uninitialized, since if they put
413 -Wuninitialized on the command line, we need to generate a
414 warning about not using it without also specifying -O. */
415 if (warn_uninitialized
!= 1)
416 warn_uninitialized
= (value
? 2 : 0);
418 if (!c_dialect_cxx ())
419 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding
420 can turn it off only if it's not explicit. */
421 warn_main
= value
* 2;
424 /* C++-specific warnings. */
425 warn_reorder
= value
;
426 warn_nontemplate_friend
= value
;
427 warn_cxx0x_compat
= value
;
429 warn_write_strings
= true;
432 cpp_opts
->warn_trigraphs
= value
;
433 cpp_opts
->warn_comments
= value
;
434 cpp_opts
->warn_num_sign_change
= value
;
435 cpp_opts
->warn_multichar
= value
; /* Was C++ only. */
437 if (warn_pointer_sign
== -1)
438 warn_pointer_sign
= 1;
443 cpp_opts
->warn_comments
= value
;
446 case OPT_Wdeprecated
:
447 cpp_opts
->warn_deprecated
= value
;
450 case OPT_Wendif_labels
:
451 cpp_opts
->warn_endif_labels
= value
;
455 cpp_opts
->warnings_are_errors
= value
;
456 global_dc
->warning_as_error_requested
= value
;
459 case OPT_Werror_implicit_function_declaration
:
460 /* For backward compatibility, this is the same as
461 -Werror=implicit-function-declaration. */
462 enable_warning_as_error ("implicit-function-declaration", value
, CL_C
| CL_ObjC
);
470 set_Wformat (atoi (arg
));
474 set_Wimplicit (value
);
478 /* Silently ignore for now. */
481 case OPT_Winvalid_pch
:
482 cpp_opts
->warn_invalid_pch
= value
;
492 case OPT_Wmissing_include_dirs
:
493 cpp_opts
->warn_missing_include_dirs
= value
;
497 cpp_opts
->warn_multichar
= value
;
500 case OPT_Wnormalized_
:
501 if (!value
|| (arg
&& strcasecmp (arg
, "none") == 0))
502 cpp_opts
->warn_normalize
= normalized_none
;
503 else if (!arg
|| strcasecmp (arg
, "nfkc") == 0)
504 cpp_opts
->warn_normalize
= normalized_KC
;
505 else if (strcasecmp (arg
, "id") == 0)
506 cpp_opts
->warn_normalize
= normalized_identifier_C
;
507 else if (strcasecmp (arg
, "nfc") == 0)
508 cpp_opts
->warn_normalize
= normalized_C
;
510 error ("argument %qs to %<-Wnormalized%> not recognized", arg
);
513 case OPT_Wreturn_type
:
514 warn_return_type
= value
;
517 case OPT_Wstrict_null_sentinel
:
518 warn_strict_null_sentinel
= value
;
521 case OPT_Wsystem_headers
:
522 cpp_opts
->warn_system_headers
= value
;
525 case OPT_Wtraditional
:
526 cpp_opts
->warn_traditional
= value
;
530 cpp_opts
->warn_trigraphs
= value
;
534 cpp_opts
->warn_undef
= value
;
537 case OPT_Wunknown_pragmas
:
538 /* Set to greater than 1, so that even unknown pragmas in
539 system headers will be warned about. */
540 warn_unknown_pragmas
= value
* 2;
543 case OPT_Wunused_macros
:
544 warn_unused_macros
= value
;
547 case OPT_Wvariadic_macros
:
548 warn_variadic_macros
= value
;
551 case OPT_Wwrite_strings
:
552 warn_write_strings
= value
;
558 warn_nonvdtor
= true;
562 if (!c_dialect_cxx ())
563 set_std_c89 (false, true);
565 set_std_cxx98 (true);
572 case OPT_fcond_mismatch
:
573 if (!c_dialect_cxx ())
575 flag_cond_mismatch
= value
;
580 case OPT_fall_virtual
:
581 case OPT_falt_external_templates
:
582 case OPT_fenum_int_equiv
:
583 case OPT_fexternal_templates
:
584 case OPT_fguiding_decls
:
586 case OPT_fhuge_objects
:
588 case OPT_fname_mangling_version_
:
590 case OPT_fnonnull_objects
:
592 case OPT_fstrict_prototype
:
593 case OPT_fthis_is_variable
:
594 case OPT_fvtable_thunks
:
597 warning (0, "switch %qs is no longer supported", option
->opt_text
);
600 case OPT_faccess_control
:
601 flag_access_control
= value
;
605 flag_no_asm
= !value
;
609 flag_no_builtin
= !value
;
616 disable_builtin_function (arg
);
619 case OPT_fdollars_in_identifiers
:
620 cpp_opts
->dollars_in_ident
= value
;
623 case OPT_ffreestanding
:
625 /* Fall through.... */
628 flag_no_builtin
= !value
;
629 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
630 if (!value
&& warn_main
== 2)
634 case OPT_fshort_double
:
635 flag_short_double
= value
;
638 case OPT_fshort_enums
:
639 flag_short_enums
= value
;
642 case OPT_fshort_wchar
:
643 flag_short_wchar
= value
;
646 case OPT_fsigned_bitfields
:
647 flag_signed_bitfields
= value
;
650 case OPT_fsigned_char
:
651 flag_signed_char
= value
;
654 case OPT_funsigned_bitfields
:
655 flag_signed_bitfields
= !value
;
658 case OPT_funsigned_char
:
659 flag_signed_char
= !value
;
663 flag_check_new
= value
;
666 case OPT_fconserve_space
:
667 flag_conserve_space
= value
;
670 case OPT_fconstant_string_class_
:
671 constant_string_class_name
= arg
;
674 case OPT_fdefault_inline
:
675 flag_default_inline
= value
;
678 case OPT_felide_constructors
:
679 flag_elide_constructors
= value
;
682 case OPT_fenforce_eh_specs
:
683 flag_enforce_eh_specs
= value
;
686 case OPT_fextended_identifiers
:
687 cpp_opts
->extended_identifiers
= value
;
691 flag_new_for_scope
= value
;
694 case OPT_fgnu_keywords
:
695 flag_no_gnu_keywords
= !value
;
698 case OPT_fgnu_runtime
:
699 flag_next_runtime
= !value
;
702 case OPT_fhandle_exceptions
:
703 warning (0, "-fhandle-exceptions has been renamed -fexceptions (and is now on by default)");
704 flag_exceptions
= value
;
707 case OPT_fimplement_inlines
:
708 flag_implement_inlines
= value
;
711 case OPT_fimplicit_inline_templates
:
712 flag_implicit_inline_templates
= value
;
715 case OPT_fimplicit_templates
:
716 flag_implicit_templates
= value
;
719 case OPT_flax_vector_conversions
:
720 flag_lax_vector_conversions
= value
;
723 case OPT_fms_extensions
:
724 flag_ms_extensions
= value
;
727 case OPT_fnext_runtime
:
728 flag_next_runtime
= value
;
731 case OPT_fnil_receivers
:
732 flag_nil_receivers
= value
;
735 case OPT_fnonansi_builtins
:
736 flag_no_nonansi_builtin
= !value
;
739 case OPT_foperator_names
:
740 cpp_opts
->operator_names
= value
;
743 case OPT_foptional_diags
:
744 flag_optional_diags
= value
;
748 cpp_opts
->restore_pch_deps
= value
;
751 case OPT_fpch_preprocess
:
752 flag_pch_preprocess
= value
;
755 case OPT_fpermissive
:
756 flag_permissive
= value
;
759 case OPT_fpreprocessed
:
760 cpp_opts
->preprocessed
= value
;
763 case OPT_freplace_objc_classes
:
764 flag_replace_objc_classes
= value
;
768 flag_use_repository
= value
;
770 flag_implicit_templates
= 0;
777 case OPT_fshow_column
:
778 cpp_opts
->show_column
= value
;
782 flag_detailed_statistics
= value
;
786 /* It is documented that we silently ignore silly values. */
787 if (value
>= 1 && value
<= 100)
788 cpp_opts
->tabstop
= value
;
791 case OPT_fexec_charset_
:
792 cpp_opts
->narrow_charset
= arg
;
795 case OPT_fwide_exec_charset_
:
796 cpp_opts
->wide_charset
= arg
;
799 case OPT_finput_charset_
:
800 cpp_opts
->input_charset
= arg
;
803 case OPT_ftemplate_depth_
:
804 max_tinst_depth
= value
;
807 case OPT_fuse_cxa_atexit
:
808 flag_use_cxa_atexit
= value
;
811 case OPT_fuse_cxa_get_exception_ptr
:
812 flag_use_cxa_get_exception_ptr
= value
;
815 case OPT_fvisibility_inlines_hidden
:
816 visibility_options
.inlines_hidden
= value
;
823 case OPT_fthreadsafe_statics
:
824 flag_threadsafe_statics
= value
;
828 flag_zero_link
= value
;
832 flag_gen_declaration
= 1;
835 case OPT_femit_struct_debug_baseonly
:
836 set_struct_debug_option ("base");
839 case OPT_femit_struct_debug_reduced
:
840 set_struct_debug_option ("dir:ord:sys,dir:gen:any,ind:base");
843 case OPT_femit_struct_debug_detailed_
:
844 set_struct_debug_option (arg
);
848 add_path (xstrdup (arg
), AFTER
, 0, true);
853 defer_opt (code
, arg
);
865 add_path (xstrdup (arg
), QUOTE
, 0, true);
873 add_path (xstrdup (arg
), SYSTEM
, 0, true);
876 case OPT_iwithprefix
:
877 add_prefixed_path (arg
, SYSTEM
);
880 case OPT_iwithprefixbefore
:
881 add_prefixed_path (arg
, BRACKET
);
885 cpp_set_lang (parse_in
, CLK_ASM
);
886 cpp_opts
->dollars_in_ident
= false;
889 case OPT_lang_fortran
:
909 error ("output filename specified twice");
912 /* We need to handle the -pedantic switches here, rather than in
913 c_common_post_options, so that a subsequent -Wno-endif-labels
914 is not overridden. */
915 case OPT_pedantic_errors
:
916 cpp_opts
->pedantic_errors
= 1;
919 cpp_opts
->pedantic
= 1;
920 cpp_opts
->warn_endif_labels
= 1;
921 if (warn_pointer_sign
== -1)
922 warn_pointer_sign
= 1;
923 if (warn_overlength_strings
== -1)
924 warn_overlength_strings
= 1;
927 case OPT_print_objc_runtime_info
:
928 print_struct_values
= 1;
931 case OPT_print_pch_checksum
:
932 c_common_print_pch_checksum (stdout
);
933 exit_after_options
= true;
941 case OPT_std_gnu__98
:
942 if (!preprocessing_asm_p
)
943 set_std_cxx98 (code
== OPT_std_c__98
/* ISO */);
947 case OPT_std_gnu__0x
:
948 if (!preprocessing_asm_p
)
949 set_std_cxx0x (code
== OPT_std_c__0x
/* ISO */);
953 case OPT_std_iso9899_1990
:
954 case OPT_std_iso9899_199409
:
955 if (!preprocessing_asm_p
)
956 set_std_c89 (code
== OPT_std_iso9899_199409
/* c94 */, true /* ISO */);
960 if (!preprocessing_asm_p
)
961 set_std_c89 (false /* c94 */, false /* ISO */);
966 case OPT_std_iso9899_1999
:
967 case OPT_std_iso9899_199x
:
968 if (!preprocessing_asm_p
)
969 set_std_c99 (true /* ISO */);
974 if (!preprocessing_asm_p
)
975 set_std_c99 (false /* ISO */);
979 cpp_opts
->trigraphs
= 1;
982 case OPT_traditional_cpp
:
983 cpp_opts
->traditional
= 1;
991 cpp_opts
->inhibit_warnings
= 1;
1002 /* Post-switch processing. */
1004 c_common_post_options (const char **pfilename
)
1006 struct cpp_callbacks
*cb
;
1008 /* Canonicalize the input and output filenames. */
1009 if (in_fnames
== NULL
)
1011 in_fnames
= XNEWVEC (const char *, 1);
1014 else if (strcmp (in_fnames
[0], "-") == 0)
1017 if (out_fname
== NULL
|| !strcmp (out_fname
, "-"))
1020 if (cpp_opts
->deps
.style
== DEPS_NONE
)
1021 check_deps_environment_vars ();
1023 handle_deferred_opts ();
1025 sanitize_cpp_opts ();
1027 register_include_chains (parse_in
, sysroot
, iprefix
, imultilib
,
1028 std_inc
, std_cxx_inc
&& c_dialect_cxx (), verbose
);
1030 #ifdef C_COMMON_OVERRIDE_OPTIONS
1031 /* Some machines may reject certain combinations of C
1032 language-specific options. */
1033 C_COMMON_OVERRIDE_OPTIONS
;
1036 flag_inline_trees
= 1;
1038 /* Use tree inlining. */
1039 if (!flag_no_inline
)
1041 if (flag_inline_functions
)
1042 flag_inline_trees
= 2;
1044 /* By default we use C99 inline semantics in GNU99 or C99 mode. C99
1045 inline semantics are not supported in GNU89 or C89 mode. */
1046 if (flag_gnu89_inline
== -1)
1047 flag_gnu89_inline
= !flag_isoc99
;
1048 else if (!flag_gnu89_inline
&& !flag_isoc99
)
1049 error ("-fno-gnu89-inline is only supported in GNU99 or C99 mode");
1051 /* If we are given more than one input file, we must use
1052 unit-at-a-time mode. */
1053 if (num_in_fnames
> 1)
1054 flag_unit_at_a_time
= 1;
1056 /* Default to ObjC sjlj exception handling if NeXT runtime. */
1057 if (flag_objc_sjlj_exceptions
< 0)
1058 flag_objc_sjlj_exceptions
= flag_next_runtime
;
1059 if (flag_objc_exceptions
&& !flag_objc_sjlj_exceptions
)
1060 flag_exceptions
= 1;
1062 /* -Wextra implies -Wclobbered, -Wempty-body, -Wsign-compare,
1063 -Wmissing-field-initializers, -Wmissing-parameter-type
1064 -Wold-style-declaration, and -Woverride-init,
1065 but not if explicitly overridden. */
1066 if (warn_clobbered
== -1)
1067 warn_clobbered
= extra_warnings
;
1068 if (warn_empty_body
== -1)
1069 warn_empty_body
= extra_warnings
;
1070 if (warn_sign_compare
== -1)
1071 warn_sign_compare
= extra_warnings
;
1072 if (warn_missing_field_initializers
== -1)
1073 warn_missing_field_initializers
= extra_warnings
;
1074 if (warn_missing_parameter_type
== -1)
1075 warn_missing_parameter_type
= extra_warnings
;
1076 if (warn_old_style_declaration
== -1)
1077 warn_old_style_declaration
= extra_warnings
;
1078 if (warn_override_init
== -1)
1079 warn_override_init
= extra_warnings
;
1081 /* -Wpointer_sign is disabled by default, but it is enabled if any
1082 of -Wall or -pedantic are given. */
1083 if (warn_pointer_sign
== -1)
1084 warn_pointer_sign
= 0;
1086 /* -Woverlength-strings is off by default, but is enabled by -pedantic.
1087 It is never enabled in C++, as the minimum limit is not normative
1088 in that standard. */
1089 if (warn_overlength_strings
== -1 || c_dialect_cxx ())
1090 warn_overlength_strings
= 0;
1092 /* Adjust various flags for C++ based on command-line settings. */
1093 if (c_dialect_cxx ())
1095 if (!flag_permissive
)
1097 flag_pedantic_errors
= 1;
1098 cpp_opts
->pedantic_errors
= 1;
1100 if (!flag_no_inline
)
1102 flag_inline_trees
= 1;
1105 if (flag_inline_functions
)
1106 flag_inline_trees
= 2;
1109 /* Special format checking options don't work without -Wformat; warn if
1113 warning (OPT_Wformat_y2k
,
1114 "-Wformat-y2k ignored without -Wformat");
1115 warning (OPT_Wformat_extra_args
,
1116 "-Wformat-extra-args ignored without -Wformat");
1117 warning (OPT_Wformat_zero_length
,
1118 "-Wformat-zero-length ignored without -Wformat");
1119 warning (OPT_Wformat_nonliteral
,
1120 "-Wformat-nonliteral ignored without -Wformat");
1121 warning (OPT_Wformat_contains_nul
,
1122 "-Wformat-contains-nul ignored without -Wformat");
1123 warning (OPT_Wformat_security
,
1124 "-Wformat-security ignored without -Wformat");
1127 /* -Wimplicit-function-declaration is enabled by default for C99. */
1128 if (warn_implicit_function_declaration
== -1)
1129 warn_implicit_function_declaration
= flag_isoc99
;
1131 /* C99 requires special handling of complex multiplication and division;
1132 -ffast-math and -fcx-limited-range are handled in process_options. */
1134 flag_complex_method
= 2;
1136 /* If we're allowing C++0x constructs, don't warn about C++0x
1137 compatibility problems. */
1139 warn_cxx0x_compat
= 0;
1141 if (flag_preprocess_only
)
1143 /* Open the output now. We must do so even if flag_no_output is
1144 on, because there may be other output than from the actual
1145 preprocessing (e.g. from -dM). */
1146 if (out_fname
[0] == '\0')
1147 out_stream
= stdout
;
1149 out_stream
= fopen (out_fname
, "w");
1151 if (out_stream
== NULL
)
1153 fatal_error ("opening output file %s: %m", out_fname
);
1157 if (num_in_fnames
> 1)
1158 error ("too many filenames given. Type %s --help for usage",
1161 init_pp_output (out_stream
);
1167 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1168 input_location
= UNKNOWN_LOCATION
;
1171 cb
= cpp_get_callbacks (parse_in
);
1172 cb
->file_change
= cb_file_change
;
1173 cb
->dir_change
= cb_dir_change
;
1174 cpp_post_options (parse_in
);
1176 input_location
= UNKNOWN_LOCATION
;
1178 /* If an error has occurred in cpplib, note it so we fail
1180 errorcount
+= cpp_errors (parse_in
);
1182 *pfilename
= this_input_filename
1183 = cpp_read_main_file (parse_in
, in_fnames
[0]);
1184 /* Don't do any compilation or preprocessing if there is no input file. */
1185 if (this_input_filename
== NULL
)
1191 if (flag_working_directory
1192 && flag_preprocess_only
&& !flag_no_line_commands
)
1193 pp_dir_change (parse_in
, get_src_pwd ());
1195 return flag_preprocess_only
;
1198 /* Front end initialization common to C, ObjC and C++. */
1200 c_common_init (void)
1202 /* Set up preprocessor arithmetic. Must be done after call to
1203 c_common_nodes_and_builtins for type nodes to be good. */
1204 cpp_opts
->precision
= TYPE_PRECISION (intmax_type_node
);
1205 cpp_opts
->char_precision
= TYPE_PRECISION (char_type_node
);
1206 cpp_opts
->int_precision
= TYPE_PRECISION (integer_type_node
);
1207 cpp_opts
->wchar_precision
= TYPE_PRECISION (wchar_type_node
);
1208 cpp_opts
->unsigned_wchar
= TYPE_UNSIGNED (wchar_type_node
);
1209 cpp_opts
->bytes_big_endian
= BYTES_BIG_ENDIAN
;
1211 /* This can't happen until after wchar_precision and bytes_big_endian
1213 cpp_init_iconv (parse_in
);
1216 c_common_print_pch_checksum (stderr
);
1218 if (flag_preprocess_only
)
1221 preprocess_file (parse_in
);
1225 /* Has to wait until now so that cpplib has its hash table. */
1231 /* Initialize the integrated preprocessor after debug output has been
1232 initialized; loop over each input file. */
1234 c_common_parse_file (int set_yydebug
)
1242 warning(0, "The C parser does not support -dy, option ignored");
1246 "The Objective-C parser does not support -dy, option ignored");
1249 warning(0, "The C++ parser does not support -dy, option ignored");
1253 "The Objective-C++ parser does not support -dy, option ignored");
1262 /* Start the main input file, if the debug writer wants it. */
1263 if (debug_hooks
->start_end_main_source_file
)
1264 (*debug_hooks
->start_source_file
) (0, this_input_filename
);
1271 /* And end the main input file, if the debug writer wants it */
1272 if (debug_hooks
->start_end_main_source_file
)
1273 (*debug_hooks
->end_source_file
) (0);
1274 if (++i
>= num_in_fnames
)
1276 cpp_undef_all (parse_in
);
1278 = cpp_read_main_file (parse_in
, in_fnames
[i
]);
1279 /* If an input file is missing, abandon further compilation.
1280 cpplib has issued a diagnostic. */
1281 if (!this_input_filename
)
1286 /* Common finish hook for the C, ObjC and C++ front ends. */
1288 c_common_finish (void)
1290 FILE *deps_stream
= NULL
;
1292 if (cpp_opts
->deps
.style
!= DEPS_NONE
)
1294 /* If -M or -MM was seen without -MF, default output to the
1297 deps_stream
= out_stream
;
1300 deps_stream
= fopen (deps_file
, deps_append
? "a": "w");
1302 fatal_error ("opening dependency file %s: %m", deps_file
);
1306 /* For performance, avoid tearing down cpplib's internal structures
1307 with cpp_destroy (). */
1308 errorcount
+= cpp_finish (parse_in
, deps_stream
);
1310 if (deps_stream
&& deps_stream
!= out_stream
1311 && (ferror (deps_stream
) || fclose (deps_stream
)))
1312 fatal_error ("closing dependency file %s: %m", deps_file
);
1314 if (out_stream
&& (ferror (out_stream
) || fclose (out_stream
)))
1315 fatal_error ("when writing output to %s: %m", out_fname
);
1318 /* Either of two environment variables can specify output of
1319 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1320 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1321 and DEPS_TARGET is the target to mention in the deps. They also
1322 result in dependency information being appended to the output file
1323 rather than overwriting it, and like Sun's compiler
1324 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1326 check_deps_environment_vars (void)
1330 GET_ENVIRONMENT (spec
, "DEPENDENCIES_OUTPUT");
1332 cpp_opts
->deps
.style
= DEPS_USER
;
1335 GET_ENVIRONMENT (spec
, "SUNPRO_DEPENDENCIES");
1338 cpp_opts
->deps
.style
= DEPS_SYSTEM
;
1339 cpp_opts
->deps
.ignore_main_file
= true;
1345 /* Find the space before the DEPS_TARGET, if there is one. */
1346 char *s
= strchr (spec
, ' ');
1349 /* Let the caller perform MAKE quoting. */
1350 defer_opt (OPT_MT
, s
+ 1);
1354 /* Command line -MF overrides environment variables and default. */
1363 /* Handle deferred command line switches. */
1365 handle_deferred_opts (void)
1370 /* Avoid allocating the deps buffer if we don't need it.
1371 (This flag may be true without there having been -MT or -MQ
1372 options, but we'll still need the deps buffer.) */
1376 deps
= cpp_get_deps (parse_in
);
1378 for (i
= 0; i
< deferred_count
; i
++)
1380 struct deferred_opt
*opt
= &deferred_opts
[i
];
1382 if (opt
->code
== OPT_MT
|| opt
->code
== OPT_MQ
)
1383 deps_add_target (deps
, opt
->arg
, opt
->code
== OPT_MQ
);
1387 /* These settings are appropriate for GCC, but not necessarily so for
1388 cpplib as a library. */
1390 sanitize_cpp_opts (void)
1392 /* If we don't know what style of dependencies to output, complain
1393 if any other dependency switches have been given. */
1394 if (deps_seen
&& cpp_opts
->deps
.style
== DEPS_NONE
)
1395 error ("to generate dependencies you must specify either -M or -MM");
1397 /* -dM and dependencies suppress normal output; do it here so that
1398 the last -d[MDN] switch overrides earlier ones. */
1399 if (flag_dump_macros
== 'M')
1402 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1403 -dM since at least glibc relies on -M -dM to work. */
1404 /* Also, flag_no_output implies flag_no_line_commands, always. */
1407 if (flag_dump_macros
!= 'M')
1408 flag_dump_macros
= 0;
1409 flag_dump_includes
= 0;
1410 flag_no_line_commands
= 1;
1413 cpp_opts
->unsigned_char
= !flag_signed_char
;
1414 cpp_opts
->stdc_0_in_system_headers
= STDC_0_IN_SYSTEM_HEADERS
;
1416 /* We want -Wno-long-long to override -pedantic -std=non-c99
1417 and/or -Wtraditional, whatever the ordering. */
1418 cpp_opts
->warn_long_long
1419 = warn_long_long
&& ((!flag_isoc99
&& pedantic
) || warn_traditional
);
1421 /* Similarly with -Wno-variadic-macros. No check for c99 here, since
1422 this also turns off warnings about GCCs extension. */
1423 cpp_opts
->warn_variadic_macros
1424 = warn_variadic_macros
&& (pedantic
|| warn_traditional
);
1426 /* If we're generating preprocessor output, emit current directory
1427 if explicitly requested or if debugging information is enabled.
1428 ??? Maybe we should only do it for debugging formats that
1429 actually output the current directory? */
1430 if (flag_working_directory
== -1)
1431 flag_working_directory
= (debug_info_level
!= DINFO_LEVEL_NONE
);
1434 /* Add include path with a prefix at the front of its name. */
1436 add_prefixed_path (const char *suffix
, size_t chain
)
1440 size_t prefix_len
, suffix_len
;
1442 suffix_len
= strlen (suffix
);
1443 prefix
= iprefix
? iprefix
: cpp_GCC_INCLUDE_DIR
;
1444 prefix_len
= iprefix
? strlen (iprefix
) : cpp_GCC_INCLUDE_DIR_len
;
1446 path
= (char *) xmalloc (prefix_len
+ suffix_len
+ 1);
1447 memcpy (path
, prefix
, prefix_len
);
1448 memcpy (path
+ prefix_len
, suffix
, suffix_len
);
1449 path
[prefix_len
+ suffix_len
] = '\0';
1451 add_path (path
, chain
, 0, false);
1454 /* Handle -D, -U, -A, -imacros, and the first -include. */
1456 finish_options (void)
1458 if (!cpp_opts
->preprocessed
)
1462 cb_file_change (parse_in
,
1463 linemap_add (&line_table
, LC_RENAME
, 0,
1464 _("<built-in>"), 0));
1466 cpp_init_builtins (parse_in
, flag_hosted
);
1467 c_cpp_builtins (parse_in
);
1469 /* We're about to send user input to cpplib, so make it warn for
1470 things that we previously (when we sent it internal definitions)
1471 told it to not warn.
1473 C99 permits implementation-defined characters in identifiers.
1474 The documented meaning of -std= is to turn off extensions that
1475 conflict with the specified standard, and since a strictly
1476 conforming program cannot contain a '$', we do not condition
1477 their acceptance on the -std= setting. */
1478 cpp_opts
->warn_dollars
= (cpp_opts
->pedantic
&& !cpp_opts
->c99
);
1480 cb_file_change (parse_in
,
1481 linemap_add (&line_table
, LC_RENAME
, 0,
1482 _("<command-line>"), 0));
1484 for (i
= 0; i
< deferred_count
; i
++)
1486 struct deferred_opt
*opt
= &deferred_opts
[i
];
1488 if (opt
->code
== OPT_D
)
1489 cpp_define (parse_in
, opt
->arg
);
1490 else if (opt
->code
== OPT_U
)
1491 cpp_undef (parse_in
, opt
->arg
);
1492 else if (opt
->code
== OPT_A
)
1494 if (opt
->arg
[0] == '-')
1495 cpp_unassert (parse_in
, opt
->arg
+ 1);
1497 cpp_assert (parse_in
, opt
->arg
);
1501 /* Handle -imacros after -D and -U. */
1502 for (i
= 0; i
< deferred_count
; i
++)
1504 struct deferred_opt
*opt
= &deferred_opts
[i
];
1506 if (opt
->code
== OPT_imacros
1507 && cpp_push_include (parse_in
, opt
->arg
))
1509 /* Disable push_command_line_include callback for now. */
1510 include_cursor
= deferred_count
+ 1;
1511 cpp_scan_nooutput (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
;
1605 /* Set the C++ 0x working draft "standard" (without GNU extensions if ISO). */
1607 set_std_cxx0x (int iso
)
1609 cpp_set_lang (parse_in
, iso
? CLK_CXX0X
: CLK_GNUCXX0X
);
1610 flag_no_gnu_keywords
= iso
;
1611 flag_no_nonansi_builtin
= iso
;
1616 /* Handle setting implicit to ON. */
1618 set_Wimplicit (int on
)
1621 warn_implicit_int
= on
;
1622 warn_implicit_function_declaration
= on
;
1625 /* Args to -d specify what to dump. Silently ignore
1626 unrecognized options; they may be aimed at toplev.c. */
1628 handle_OPT_d (const char *arg
)
1632 while ((c
= *arg
++) != '\0')
1635 case 'M': /* Dump macros only. */
1636 case 'N': /* Dump names. */
1637 case 'D': /* Dump definitions. */
1638 flag_dump_macros
= c
;
1642 flag_dump_includes
= 1;