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 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"
36 #include "c-incpath.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 /* If -lang-fortran seen. */
76 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 /* By default, C99-like requirements for complex multiply and divide. */
236 flag_complex_method
= 2;
238 deferred_opts
= XNEWVEC (struct deferred_opt
, argc
);
240 result
= lang_flags
[c_language
];
242 if (c_language
== clk_c
)
244 /* If preprocessing assembly language, accept any of the C-family
245 front end options since the driver may pass them through. */
246 for (i
= 1; i
< argc
; i
++)
247 if (! strcmp (argv
[i
], "-lang-asm"))
249 result
|= CL_C
| CL_ObjC
| CL_CXX
| CL_ObjCXX
;
254 for (i
= 1; i
< argc
; i
++)
255 if (! strcmp (argv
[i
], "-lang-fortran"))
257 result
|= CL_Fortran
;
266 /* Handle switch SCODE with argument ARG. VALUE is true, unless no-
267 form of an -f or -W option was given. Returns 0 if the switch was
268 invalid, a negative number to prevent language-independent
269 processing in toplev.c (a hack necessary for the short-term). */
271 c_common_handle_option (size_t scode
, const char *arg
, int value
)
273 const struct cl_option
*option
= &cl_options
[scode
];
274 enum opt_code code
= (enum opt_code
) scode
;
277 /* Prevent resetting the language standard to a C dialect when the driver
278 has already determined that we're looking at assembler input. */
279 bool preprocessing_asm_p
= (cpp_get_options (parse_in
)->lang
== CLK_ASM
);
284 if (cl_options
[code
].flags
& (CL_C
| CL_CXX
| CL_ObjC
| CL_ObjCXX
))
286 if ((option
->flags
& CL_TARGET
)
287 && ! targetcm
.handle_c_option (scode
, arg
, value
))
292 if (lang_fortran
&& (cl_options
[code
].flags
& (CL_Fortran
)))
298 case OPT__output_pch_
:
303 defer_opt (code
, arg
);
307 cpp_opts
->discard_comments
= 0;
311 cpp_opts
->discard_comments
= 0;
312 cpp_opts
->discard_comments_in_macro_exp
= 0;
316 defer_opt (code
, arg
);
320 flag_preprocess_only
= 1;
324 cpp_opts
->print_include_names
= 1;
328 TARGET_OPTF (xstrdup (arg
));
332 if (strcmp (arg
, "-"))
333 add_path (xstrdup (arg
), BRACKET
, 0, true);
336 if (quote_chain_split
)
337 error ("-I- specified twice");
338 quote_chain_split
= true;
339 split_quote_chain ();
340 inform ("obsolete option -I- used, please use -iquote instead");
346 /* When doing dependencies with -M or -MM, suppress normal
347 preprocessed output, but still do -dM etc. as software
348 depends on this. Preprocessed output does occur if -MD, -MMD
349 or environment var dependency generation is used. */
350 cpp_opts
->deps
.style
= (code
== OPT_M
? DEPS_SYSTEM
: DEPS_USER
);
352 cpp_opts
->inhibit_warnings
= 1;
357 cpp_opts
->deps
.style
= (code
== OPT_MD
? DEPS_SYSTEM
: DEPS_USER
);
368 cpp_opts
->deps
.missing_files
= true;
373 cpp_opts
->deps
.phony_targets
= true;
379 defer_opt (code
, arg
);
383 flag_no_line_commands
= 1;
386 case OPT_fworking_directory
:
387 flag_working_directory
= value
;
391 defer_opt (code
, arg
);
397 set_Wimplicit (value
);
398 warn_char_subscripts
= value
;
399 warn_missing_braces
= value
;
400 warn_parentheses
= value
;
401 warn_return_type
= value
;
402 warn_sequence_point
= value
; /* Was C only. */
404 set_Wstrict_aliasing (value
);
405 warn_address
= value
;
406 warn_strict_overflow
= value
;
407 warn_array_bounds
= value
;
409 /* Only warn about unknown pragmas that are not in system
411 warn_unknown_pragmas
= value
;
413 /* We save the value of warn_uninitialized, since if they put
414 -Wuninitialized on the command line, we need to generate a
415 warning about not using it without also specifying -O. */
416 if (warn_uninitialized
!= 1)
417 warn_uninitialized
= (value
? 2 : 0);
419 if (!c_dialect_cxx ())
420 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding
421 can turn it off only if it's not explicit. */
422 warn_main
= value
* 2;
425 /* C++-specific warnings. */
426 warn_sign_compare
= value
;
427 warn_reorder
= value
;
428 warn_cxx0x_compat
= value
;
431 cpp_opts
->warn_trigraphs
= value
;
432 cpp_opts
->warn_comments
= value
;
433 cpp_opts
->warn_num_sign_change
= value
;
435 if (warn_pointer_sign
== -1)
436 warn_pointer_sign
= 1;
441 cpp_opts
->warn_comments
= value
;
444 case OPT_Wdeprecated
:
445 cpp_opts
->warn_deprecated
= value
;
448 case OPT_Wendif_labels
:
449 cpp_opts
->warn_endif_labels
= value
;
453 cpp_opts
->warnings_are_errors
= value
;
454 global_dc
->warning_as_error_requested
= value
;
457 case OPT_Werror_implicit_function_declaration
:
458 /* For backward compatibility, this is the same as
459 -Werror=implicit-function-declaration. */
460 enable_warning_as_error ("implicit-function-declaration", value
, CL_C
| CL_ObjC
);
468 set_Wformat (atoi (arg
));
472 set_Wimplicit (value
);
476 /* Silently ignore for now. */
479 case OPT_Winvalid_pch
:
480 cpp_opts
->warn_invalid_pch
= value
;
490 case OPT_Wmissing_include_dirs
:
491 cpp_opts
->warn_missing_include_dirs
= value
;
495 cpp_opts
->warn_multichar
= value
;
498 case OPT_Wnormalized_
:
499 if (!value
|| (arg
&& strcasecmp (arg
, "none") == 0))
500 cpp_opts
->warn_normalize
= normalized_none
;
501 else if (!arg
|| strcasecmp (arg
, "nfkc") == 0)
502 cpp_opts
->warn_normalize
= normalized_KC
;
503 else if (strcasecmp (arg
, "id") == 0)
504 cpp_opts
->warn_normalize
= normalized_identifier_C
;
505 else if (strcasecmp (arg
, "nfc") == 0)
506 cpp_opts
->warn_normalize
= normalized_C
;
508 error ("argument %qs to %<-Wnormalized%> not recognized", arg
);
511 case OPT_Wreturn_type
:
512 warn_return_type
= value
;
515 case OPT_Wstrict_null_sentinel
:
516 warn_strict_null_sentinel
= value
;
519 case OPT_Wsystem_headers
:
520 cpp_opts
->warn_system_headers
= value
;
523 case OPT_Wtraditional
:
524 cpp_opts
->warn_traditional
= value
;
528 cpp_opts
->warn_trigraphs
= value
;
532 cpp_opts
->warn_undef
= value
;
535 case OPT_Wunknown_pragmas
:
536 /* Set to greater than 1, so that even unknown pragmas in
537 system headers will be warned about. */
538 warn_unknown_pragmas
= value
* 2;
541 case OPT_Wunused_macros
:
542 warn_unused_macros
= value
;
545 case OPT_Wvariadic_macros
:
546 warn_variadic_macros
= value
;
549 case OPT_Wwrite_strings
:
550 warn_write_strings
= value
;
556 warn_nonvdtor
= true;
560 if (!c_dialect_cxx ())
561 set_std_c89 (false, true);
563 set_std_cxx98 (true);
570 case OPT_fcond_mismatch
:
571 if (!c_dialect_cxx ())
573 flag_cond_mismatch
= value
;
578 case OPT_fall_virtual
:
579 case OPT_falt_external_templates
:
580 case OPT_fenum_int_equiv
:
581 case OPT_fexternal_templates
:
582 case OPT_fguiding_decls
:
584 case OPT_fhuge_objects
:
586 case OPT_fname_mangling_version_
:
588 case OPT_fnonnull_objects
:
590 case OPT_fstrict_prototype
:
591 case OPT_fthis_is_variable
:
592 case OPT_fvtable_thunks
:
595 warning (0, "switch %qs is no longer supported", option
->opt_text
);
598 case OPT_faccess_control
:
599 flag_access_control
= value
;
603 flag_no_asm
= !value
;
607 flag_no_builtin
= !value
;
614 disable_builtin_function (arg
);
617 case OPT_fdirectives_only
:
618 cpp_opts
->directives_only
= value
;
621 case OPT_fdollars_in_identifiers
:
622 cpp_opts
->dollars_in_ident
= value
;
625 case OPT_ffreestanding
:
627 /* Fall through.... */
630 flag_no_builtin
= !value
;
631 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
632 if (!value
&& warn_main
== 2)
636 case OPT_fshort_double
:
637 flag_short_double
= value
;
640 case OPT_fshort_enums
:
641 flag_short_enums
= value
;
644 case OPT_fshort_wchar
:
645 flag_short_wchar
= value
;
648 case OPT_fsigned_bitfields
:
649 flag_signed_bitfields
= value
;
652 case OPT_fsigned_char
:
653 flag_signed_char
= value
;
656 case OPT_funsigned_bitfields
:
657 flag_signed_bitfields
= !value
;
660 case OPT_funsigned_char
:
661 flag_signed_char
= !value
;
665 flag_check_new
= value
;
668 case OPT_fconserve_space
:
669 flag_conserve_space
= value
;
672 case OPT_fconstant_string_class_
:
673 constant_string_class_name
= arg
;
676 case OPT_fdefault_inline
:
677 flag_default_inline
= value
;
680 case OPT_felide_constructors
:
681 flag_elide_constructors
= value
;
684 case OPT_fenforce_eh_specs
:
685 flag_enforce_eh_specs
= value
;
688 case OPT_fextended_identifiers
:
689 cpp_opts
->extended_identifiers
= value
;
693 flag_new_for_scope
= value
;
696 case OPT_fgnu_keywords
:
697 flag_no_gnu_keywords
= !value
;
700 case OPT_fgnu_runtime
:
701 flag_next_runtime
= !value
;
704 case OPT_fhandle_exceptions
:
705 warning (0, "-fhandle-exceptions has been renamed -fexceptions (and is now on by default)");
706 flag_exceptions
= value
;
709 case OPT_fimplement_inlines
:
710 flag_implement_inlines
= value
;
713 case OPT_fimplicit_inline_templates
:
714 flag_implicit_inline_templates
= value
;
717 case OPT_fimplicit_templates
:
718 flag_implicit_templates
= value
;
721 case OPT_flax_vector_conversions
:
722 flag_lax_vector_conversions
= value
;
725 case OPT_fms_extensions
:
726 flag_ms_extensions
= value
;
729 case OPT_fnext_runtime
:
730 flag_next_runtime
= value
;
733 case OPT_fnil_receivers
:
734 flag_nil_receivers
= value
;
737 case OPT_fnonansi_builtins
:
738 flag_no_nonansi_builtin
= !value
;
741 case OPT_foperator_names
:
742 cpp_opts
->operator_names
= value
;
745 case OPT_foptional_diags
:
746 flag_optional_diags
= value
;
750 cpp_opts
->restore_pch_deps
= value
;
753 case OPT_fpch_preprocess
:
754 flag_pch_preprocess
= value
;
757 case OPT_fpermissive
:
758 flag_permissive
= value
;
761 case OPT_fpreprocessed
:
762 cpp_opts
->preprocessed
= value
;
765 case OPT_freplace_objc_classes
:
766 flag_replace_objc_classes
= value
;
770 flag_use_repository
= value
;
772 flag_implicit_templates
= 0;
779 case OPT_fshow_column
:
780 cpp_opts
->show_column
= value
;
784 flag_detailed_statistics
= value
;
788 /* It is documented that we silently ignore silly values. */
789 if (value
>= 1 && value
<= 100)
790 cpp_opts
->tabstop
= value
;
793 case OPT_fexec_charset_
:
794 cpp_opts
->narrow_charset
= arg
;
797 case OPT_fwide_exec_charset_
:
798 cpp_opts
->wide_charset
= arg
;
801 case OPT_finput_charset_
:
802 cpp_opts
->input_charset
= arg
;
805 case OPT_ftemplate_depth_
:
806 max_tinst_depth
= value
;
809 case OPT_fuse_cxa_atexit
:
810 flag_use_cxa_atexit
= value
;
813 case OPT_fuse_cxa_get_exception_ptr
:
814 flag_use_cxa_get_exception_ptr
= value
;
817 case OPT_fvisibility_inlines_hidden
:
818 visibility_options
.inlines_hidden
= value
;
825 case OPT_fthreadsafe_statics
:
826 flag_threadsafe_statics
= value
;
830 flag_zero_link
= value
;
834 flag_gen_declaration
= 1;
837 case OPT_femit_struct_debug_baseonly
:
838 set_struct_debug_option ("base");
841 case OPT_femit_struct_debug_reduced
:
842 set_struct_debug_option ("dir:ord:sys,dir:gen:any,ind:base");
845 case OPT_femit_struct_debug_detailed_
:
846 set_struct_debug_option (arg
);
850 add_path (xstrdup (arg
), AFTER
, 0, true);
855 defer_opt (code
, arg
);
867 add_path (xstrdup (arg
), QUOTE
, 0, true);
875 add_path (xstrdup (arg
), SYSTEM
, 0, true);
878 case OPT_iwithprefix
:
879 add_prefixed_path (arg
, SYSTEM
);
882 case OPT_iwithprefixbefore
:
883 add_prefixed_path (arg
, BRACKET
);
887 cpp_set_lang (parse_in
, CLK_ASM
);
888 cpp_opts
->dollars_in_ident
= false;
891 case OPT_lang_fortran
:
911 error ("output filename specified twice");
914 /* We need to handle the -pedantic switches here, rather than in
915 c_common_post_options, so that a subsequent -Wno-endif-labels
916 is not overridden. */
917 case OPT_pedantic_errors
:
918 cpp_opts
->pedantic_errors
= 1;
921 cpp_opts
->pedantic
= 1;
922 cpp_opts
->warn_endif_labels
= 1;
923 if (warn_pointer_sign
== -1)
924 warn_pointer_sign
= 1;
925 if (warn_overlength_strings
== -1)
926 warn_overlength_strings
= 1;
929 case OPT_print_objc_runtime_info
:
930 print_struct_values
= 1;
933 case OPT_print_pch_checksum
:
934 c_common_print_pch_checksum (stdout
);
935 exit_after_options
= true;
943 case OPT_std_gnu__98
:
944 if (!preprocessing_asm_p
)
945 set_std_cxx98 (code
== OPT_std_c__98
/* ISO */);
949 case OPT_std_gnu__0x
:
950 if (!preprocessing_asm_p
)
951 set_std_cxx0x (code
== OPT_std_c__0x
/* ISO */);
955 case OPT_std_iso9899_1990
:
956 case OPT_std_iso9899_199409
:
957 if (!preprocessing_asm_p
)
958 set_std_c89 (code
== OPT_std_iso9899_199409
/* c94 */, true /* ISO */);
962 if (!preprocessing_asm_p
)
963 set_std_c89 (false /* c94 */, false /* ISO */);
968 case OPT_std_iso9899_1999
:
969 case OPT_std_iso9899_199x
:
970 if (!preprocessing_asm_p
)
971 set_std_c99 (true /* ISO */);
976 if (!preprocessing_asm_p
)
977 set_std_c99 (false /* ISO */);
981 cpp_opts
->trigraphs
= 1;
984 case OPT_traditional_cpp
:
985 cpp_opts
->traditional
= 1;
993 cpp_opts
->inhibit_warnings
= 1;
1004 /* Post-switch processing. */
1006 c_common_post_options (const char **pfilename
)
1008 struct cpp_callbacks
*cb
;
1010 /* Canonicalize the input and output filenames. */
1011 if (in_fnames
== NULL
)
1013 in_fnames
= XNEWVEC (const char *, 1);
1016 else if (strcmp (in_fnames
[0], "-") == 0)
1019 if (out_fname
== NULL
|| !strcmp (out_fname
, "-"))
1022 if (cpp_opts
->deps
.style
== DEPS_NONE
)
1023 check_deps_environment_vars ();
1025 handle_deferred_opts ();
1027 sanitize_cpp_opts ();
1029 register_include_chains (parse_in
, sysroot
, iprefix
, imultilib
,
1030 std_inc
, std_cxx_inc
&& c_dialect_cxx (), verbose
);
1032 #ifdef C_COMMON_OVERRIDE_OPTIONS
1033 /* Some machines may reject certain combinations of C
1034 language-specific options. */
1035 C_COMMON_OVERRIDE_OPTIONS
;
1038 flag_inline_trees
= 1;
1040 /* Use tree inlining. */
1041 if (!flag_no_inline
)
1043 if (flag_inline_functions
)
1044 flag_inline_trees
= 2;
1046 /* By default we use C99 inline semantics in GNU99 or C99 mode. C99
1047 inline semantics are not supported in GNU89 or C89 mode. */
1048 if (flag_gnu89_inline
== -1)
1049 flag_gnu89_inline
= !flag_isoc99
;
1050 else if (!flag_gnu89_inline
&& !flag_isoc99
)
1051 error ("-fno-gnu89-inline is only supported in GNU99 or C99 mode");
1053 /* If we are given more than one input file, we must use
1054 unit-at-a-time mode. */
1055 if (num_in_fnames
> 1)
1056 flag_unit_at_a_time
= 1;
1058 /* Default to ObjC sjlj exception handling if NeXT runtime. */
1059 if (flag_objc_sjlj_exceptions
< 0)
1060 flag_objc_sjlj_exceptions
= flag_next_runtime
;
1061 if (flag_objc_exceptions
&& !flag_objc_sjlj_exceptions
)
1062 flag_exceptions
= 1;
1064 /* -Wextra implies -Wtype-limits, -Wclobbered,
1065 -Wempty-body, -Wsign-compare,
1066 -Wmissing-field-initializers, -Wmissing-parameter-type
1067 -Wold-style-declaration, and -Woverride-init,
1068 but not if explicitly overridden. */
1069 if (warn_type_limits
== -1)
1070 warn_type_limits
= extra_warnings
;
1071 if (warn_clobbered
== -1)
1072 warn_clobbered
= extra_warnings
;
1073 if (warn_empty_body
== -1)
1074 warn_empty_body
= extra_warnings
;
1075 if (warn_sign_compare
== -1)
1076 warn_sign_compare
= extra_warnings
;
1077 if (warn_missing_field_initializers
== -1)
1078 warn_missing_field_initializers
= extra_warnings
;
1079 if (warn_missing_parameter_type
== -1)
1080 warn_missing_parameter_type
= extra_warnings
;
1081 if (warn_old_style_declaration
== -1)
1082 warn_old_style_declaration
= extra_warnings
;
1083 if (warn_override_init
== -1)
1084 warn_override_init
= extra_warnings
;
1086 /* -Wpointer_sign is disabled by default, but it is enabled if any
1087 of -Wall or -pedantic are given. */
1088 if (warn_pointer_sign
== -1)
1089 warn_pointer_sign
= 0;
1091 /* -Woverlength-strings is off by default, but is enabled by -pedantic.
1092 It is never enabled in C++, as the minimum limit is not normative
1093 in that standard. */
1094 if (warn_overlength_strings
== -1 || c_dialect_cxx ())
1095 warn_overlength_strings
= 0;
1097 /* Adjust various flags for C++ based on command-line settings. */
1098 if (c_dialect_cxx ())
1100 if (!flag_permissive
)
1102 flag_pedantic_errors
= 1;
1103 cpp_opts
->pedantic_errors
= 1;
1105 if (!flag_no_inline
)
1107 flag_inline_trees
= 1;
1110 if (flag_inline_functions
)
1111 flag_inline_trees
= 2;
1114 /* In C, -Wconversion enables -Wsign-conversion (unless disabled
1115 through -Wno-sign-conversion). While in C++,
1116 -Wsign-conversion needs to be requested explicitly. */
1117 if (warn_sign_conversion
== -1)
1118 warn_sign_conversion
= (c_dialect_cxx ()) ? 0 : warn_conversion
;
1121 /* Special format checking options don't work without -Wformat; warn if
1125 warning (OPT_Wformat_y2k
,
1126 "-Wformat-y2k ignored without -Wformat");
1127 warning (OPT_Wformat_extra_args
,
1128 "-Wformat-extra-args ignored without -Wformat");
1129 warning (OPT_Wformat_zero_length
,
1130 "-Wformat-zero-length ignored without -Wformat");
1131 warning (OPT_Wformat_nonliteral
,
1132 "-Wformat-nonliteral ignored without -Wformat");
1133 warning (OPT_Wformat_contains_nul
,
1134 "-Wformat-contains-nul ignored without -Wformat");
1135 warning (OPT_Wformat_security
,
1136 "-Wformat-security ignored without -Wformat");
1139 /* -Wimplicit-function-declaration is enabled by default for C99. */
1140 if (warn_implicit_function_declaration
== -1)
1141 warn_implicit_function_declaration
= flag_isoc99
;
1143 /* If we're allowing C++0x constructs, don't warn about C++0x
1144 compatibility problems. */
1145 if (cxx_dialect
== cxx0x
)
1146 warn_cxx0x_compat
= 0;
1148 if (flag_preprocess_only
)
1150 /* Open the output now. We must do so even if flag_no_output is
1151 on, because there may be other output than from the actual
1152 preprocessing (e.g. from -dM). */
1153 if (out_fname
[0] == '\0')
1154 out_stream
= stdout
;
1156 out_stream
= fopen (out_fname
, "w");
1158 if (out_stream
== NULL
)
1160 fatal_error ("opening output file %s: %m", out_fname
);
1164 if (num_in_fnames
> 1)
1165 error ("too many filenames given. Type %s --help for usage",
1168 init_pp_output (out_stream
);
1174 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1175 input_location
= UNKNOWN_LOCATION
;
1178 cb
= cpp_get_callbacks (parse_in
);
1179 cb
->file_change
= cb_file_change
;
1180 cb
->dir_change
= cb_dir_change
;
1181 cpp_post_options (parse_in
);
1183 input_location
= UNKNOWN_LOCATION
;
1185 /* If an error has occurred in cpplib, note it so we fail
1187 errorcount
+= cpp_errors (parse_in
);
1189 *pfilename
= this_input_filename
1190 = cpp_read_main_file (parse_in
, in_fnames
[0]);
1191 /* Don't do any compilation or preprocessing if there is no input file. */
1192 if (this_input_filename
== NULL
)
1198 if (flag_working_directory
1199 && flag_preprocess_only
&& !flag_no_line_commands
)
1200 pp_dir_change (parse_in
, get_src_pwd ());
1202 return flag_preprocess_only
;
1205 /* Front end initialization common to C, ObjC and C++. */
1207 c_common_init (void)
1209 /* Set up preprocessor arithmetic. Must be done after call to
1210 c_common_nodes_and_builtins for type nodes to be good. */
1211 cpp_opts
->precision
= TYPE_PRECISION (intmax_type_node
);
1212 cpp_opts
->char_precision
= TYPE_PRECISION (char_type_node
);
1213 cpp_opts
->int_precision
= TYPE_PRECISION (integer_type_node
);
1214 cpp_opts
->wchar_precision
= TYPE_PRECISION (wchar_type_node
);
1215 cpp_opts
->unsigned_wchar
= TYPE_UNSIGNED (wchar_type_node
);
1216 cpp_opts
->bytes_big_endian
= BYTES_BIG_ENDIAN
;
1218 /* This can't happen until after wchar_precision and bytes_big_endian
1220 cpp_init_iconv (parse_in
);
1223 c_common_print_pch_checksum (stderr
);
1225 if (flag_preprocess_only
)
1228 preprocess_file (parse_in
);
1232 /* Has to wait until now so that cpplib has its hash table. */
1238 /* Initialize the integrated preprocessor after debug output has been
1239 initialized; loop over each input file. */
1241 c_common_parse_file (int set_yydebug
)
1249 warning(0, "The C parser does not support -dy, option ignored");
1253 "The Objective-C parser does not support -dy, option ignored");
1256 warning(0, "The C++ parser does not support -dy, option ignored");
1260 "The Objective-C++ parser does not support -dy, option ignored");
1269 /* Start the main input file, if the debug writer wants it. */
1270 if (debug_hooks
->start_end_main_source_file
)
1271 (*debug_hooks
->start_source_file
) (0, this_input_filename
);
1278 /* And end the main input file, if the debug writer wants it */
1279 if (debug_hooks
->start_end_main_source_file
)
1280 (*debug_hooks
->end_source_file
) (0);
1281 if (++i
>= num_in_fnames
)
1283 cpp_undef_all (parse_in
);
1285 = cpp_read_main_file (parse_in
, in_fnames
[i
]);
1286 /* If an input file is missing, abandon further compilation.
1287 cpplib has issued a diagnostic. */
1288 if (!this_input_filename
)
1293 /* Common finish hook for the C, ObjC and C++ front ends. */
1295 c_common_finish (void)
1297 FILE *deps_stream
= NULL
;
1299 if (cpp_opts
->deps
.style
!= DEPS_NONE
)
1301 /* If -M or -MM was seen without -MF, default output to the
1304 deps_stream
= out_stream
;
1307 deps_stream
= fopen (deps_file
, deps_append
? "a": "w");
1309 fatal_error ("opening dependency file %s: %m", deps_file
);
1313 /* For performance, avoid tearing down cpplib's internal structures
1314 with cpp_destroy (). */
1315 errorcount
+= cpp_finish (parse_in
, deps_stream
);
1317 if (deps_stream
&& deps_stream
!= out_stream
1318 && (ferror (deps_stream
) || fclose (deps_stream
)))
1319 fatal_error ("closing dependency file %s: %m", deps_file
);
1321 if (out_stream
&& (ferror (out_stream
) || fclose (out_stream
)))
1322 fatal_error ("when writing output to %s: %m", out_fname
);
1325 /* Either of two environment variables can specify output of
1326 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1327 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1328 and DEPS_TARGET is the target to mention in the deps. They also
1329 result in dependency information being appended to the output file
1330 rather than overwriting it, and like Sun's compiler
1331 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1333 check_deps_environment_vars (void)
1337 GET_ENVIRONMENT (spec
, "DEPENDENCIES_OUTPUT");
1339 cpp_opts
->deps
.style
= DEPS_USER
;
1342 GET_ENVIRONMENT (spec
, "SUNPRO_DEPENDENCIES");
1345 cpp_opts
->deps
.style
= DEPS_SYSTEM
;
1346 cpp_opts
->deps
.ignore_main_file
= true;
1352 /* Find the space before the DEPS_TARGET, if there is one. */
1353 char *s
= strchr (spec
, ' ');
1356 /* Let the caller perform MAKE quoting. */
1357 defer_opt (OPT_MT
, s
+ 1);
1361 /* Command line -MF overrides environment variables and default. */
1370 /* Handle deferred command line switches. */
1372 handle_deferred_opts (void)
1377 /* Avoid allocating the deps buffer if we don't need it.
1378 (This flag may be true without there having been -MT or -MQ
1379 options, but we'll still need the deps buffer.) */
1383 deps
= cpp_get_deps (parse_in
);
1385 for (i
= 0; i
< deferred_count
; i
++)
1387 struct deferred_opt
*opt
= &deferred_opts
[i
];
1389 if (opt
->code
== OPT_MT
|| opt
->code
== OPT_MQ
)
1390 deps_add_target (deps
, opt
->arg
, opt
->code
== OPT_MQ
);
1394 /* These settings are appropriate for GCC, but not necessarily so for
1395 cpplib as a library. */
1397 sanitize_cpp_opts (void)
1399 /* If we don't know what style of dependencies to output, complain
1400 if any other dependency switches have been given. */
1401 if (deps_seen
&& cpp_opts
->deps
.style
== DEPS_NONE
)
1402 error ("to generate dependencies you must specify either -M or -MM");
1404 /* -dM and dependencies suppress normal output; do it here so that
1405 the last -d[MDN] switch overrides earlier ones. */
1406 if (flag_dump_macros
== 'M')
1409 /* By default, -fdirectives-only implies -dD. This allows subsequent phases
1410 to perform proper macro expansion. */
1411 if (cpp_opts
->directives_only
&& !cpp_opts
->preprocessed
&& !flag_dump_macros
)
1412 flag_dump_macros
= 'D';
1414 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1415 -dM since at least glibc relies on -M -dM to work. */
1416 /* Also, flag_no_output implies flag_no_line_commands, always. */
1419 if (flag_dump_macros
!= 'M')
1420 flag_dump_macros
= 0;
1421 flag_dump_includes
= 0;
1422 flag_no_line_commands
= 1;
1425 cpp_opts
->unsigned_char
= !flag_signed_char
;
1426 cpp_opts
->stdc_0_in_system_headers
= STDC_0_IN_SYSTEM_HEADERS
;
1428 /* We want -Wno-long-long to override -pedantic -std=non-c99
1429 and/or -Wtraditional, whatever the ordering. */
1430 cpp_opts
->warn_long_long
1431 = warn_long_long
&& ((!flag_isoc99
&& pedantic
) || warn_traditional
);
1433 /* Similarly with -Wno-variadic-macros. No check for c99 here, since
1434 this also turns off warnings about GCCs extension. */
1435 cpp_opts
->warn_variadic_macros
1436 = warn_variadic_macros
&& (pedantic
|| warn_traditional
);
1438 /* If we're generating preprocessor output, emit current directory
1439 if explicitly requested or if debugging information is enabled.
1440 ??? Maybe we should only do it for debugging formats that
1441 actually output the current directory? */
1442 if (flag_working_directory
== -1)
1443 flag_working_directory
= (debug_info_level
!= DINFO_LEVEL_NONE
);
1445 if (cpp_opts
->directives_only
)
1447 if (warn_unused_macros
)
1448 error ("-fdirectives-only is incompatible with -Wunused_macros");
1449 if (cpp_opts
->traditional
)
1450 error ("-fdirectives-only is incompatible with -traditional");
1454 /* Add include path with a prefix at the front of its name. */
1456 add_prefixed_path (const char *suffix
, size_t chain
)
1460 size_t prefix_len
, suffix_len
;
1462 suffix_len
= strlen (suffix
);
1463 prefix
= iprefix
? iprefix
: cpp_GCC_INCLUDE_DIR
;
1464 prefix_len
= iprefix
? strlen (iprefix
) : cpp_GCC_INCLUDE_DIR_len
;
1466 path
= (char *) xmalloc (prefix_len
+ suffix_len
+ 1);
1467 memcpy (path
, prefix
, prefix_len
);
1468 memcpy (path
+ prefix_len
, suffix
, suffix_len
);
1469 path
[prefix_len
+ suffix_len
] = '\0';
1471 add_path (path
, chain
, 0, false);
1474 /* Handle -D, -U, -A, -imacros, and the first -include. */
1476 finish_options (void)
1478 if (!cpp_opts
->preprocessed
)
1482 cb_file_change (parse_in
,
1483 linemap_add (line_table
, LC_RENAME
, 0,
1484 _("<built-in>"), 0));
1486 cpp_init_builtins (parse_in
, flag_hosted
);
1487 c_cpp_builtins (parse_in
);
1489 /* We're about to send user input to cpplib, so make it warn for
1490 things that we previously (when we sent it internal definitions)
1491 told it to not warn.
1493 C99 permits implementation-defined characters in identifiers.
1494 The documented meaning of -std= is to turn off extensions that
1495 conflict with the specified standard, and since a strictly
1496 conforming program cannot contain a '$', we do not condition
1497 their acceptance on the -std= setting. */
1498 cpp_opts
->warn_dollars
= (cpp_opts
->pedantic
&& !cpp_opts
->c99
);
1500 cb_file_change (parse_in
,
1501 linemap_add (line_table
, LC_RENAME
, 0,
1502 _("<command-line>"), 0));
1504 for (i
= 0; i
< deferred_count
; i
++)
1506 struct deferred_opt
*opt
= &deferred_opts
[i
];
1508 if (opt
->code
== OPT_D
)
1509 cpp_define (parse_in
, opt
->arg
);
1510 else if (opt
->code
== OPT_U
)
1511 cpp_undef (parse_in
, opt
->arg
);
1512 else if (opt
->code
== OPT_A
)
1514 if (opt
->arg
[0] == '-')
1515 cpp_unassert (parse_in
, opt
->arg
+ 1);
1517 cpp_assert (parse_in
, opt
->arg
);
1521 /* Handle -imacros after -D and -U. */
1522 for (i
= 0; i
< deferred_count
; i
++)
1524 struct deferred_opt
*opt
= &deferred_opts
[i
];
1526 if (opt
->code
== OPT_imacros
1527 && cpp_push_include (parse_in
, opt
->arg
))
1529 /* Disable push_command_line_include callback for now. */
1530 include_cursor
= deferred_count
+ 1;
1531 cpp_scan_nooutput (parse_in
);
1535 else if (cpp_opts
->directives_only
)
1536 cpp_init_special_builtins (parse_in
);
1539 push_command_line_include ();
1542 /* Give CPP the next file given by -include, if any. */
1544 push_command_line_include (void)
1546 while (include_cursor
< deferred_count
)
1548 struct deferred_opt
*opt
= &deferred_opts
[include_cursor
++];
1550 if (!cpp_opts
->preprocessed
&& opt
->code
== OPT_include
1551 && cpp_push_include (parse_in
, opt
->arg
))
1555 if (include_cursor
== deferred_count
)
1558 /* -Wunused-macros should only warn about macros defined hereafter. */
1559 cpp_opts
->warn_unused_macros
= warn_unused_macros
;
1560 /* Restore the line map from <command line>. */
1561 if (!cpp_opts
->preprocessed
)
1562 cpp_change_file (parse_in
, LC_RENAME
, this_input_filename
);
1564 /* Set this here so the client can change the option if it wishes,
1565 and after stacking the main file so we don't trace the main file. */
1566 line_table
->trace_includes
= cpp_opts
->print_include_names
;
1570 /* File change callback. Has to handle -include files. */
1572 cb_file_change (cpp_reader
* ARG_UNUSED (pfile
),
1573 const struct line_map
*new_map
)
1575 if (flag_preprocess_only
)
1576 pp_file_change (new_map
);
1578 fe_file_change (new_map
);
1580 if (new_map
== 0 || (new_map
->reason
== LC_LEAVE
&& MAIN_FILE_P (new_map
)))
1581 push_command_line_include ();
1585 cb_dir_change (cpp_reader
* ARG_UNUSED (pfile
), const char *dir
)
1587 if (!set_src_pwd (dir
))
1588 warning (0, "too late for # directive to set debug directory");
1591 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1592 extensions if ISO). There is no concept of gnu94. */
1594 set_std_c89 (int c94
, int iso
)
1596 cpp_set_lang (parse_in
, c94
? CLK_STDC94
: iso
? CLK_STDC89
: CLK_GNUC89
);
1599 flag_no_gnu_keywords
= iso
;
1600 flag_no_nonansi_builtin
= iso
;
1605 /* Set the C 99 standard (without GNU extensions if ISO). */
1607 set_std_c99 (int iso
)
1609 cpp_set_lang (parse_in
, iso
? CLK_STDC99
: CLK_GNUC99
);
1611 flag_no_nonansi_builtin
= iso
;
1617 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1619 set_std_cxx98 (int iso
)
1621 cpp_set_lang (parse_in
, iso
? CLK_CXX98
: CLK_GNUCXX
);
1622 flag_no_gnu_keywords
= iso
;
1623 flag_no_nonansi_builtin
= iso
;
1625 cxx_dialect
= cxx98
;
1628 /* Set the C++ 0x working draft "standard" (without GNU extensions if ISO). */
1630 set_std_cxx0x (int iso
)
1632 cpp_set_lang (parse_in
, iso
? CLK_CXX0X
: CLK_GNUCXX0X
);
1633 flag_no_gnu_keywords
= iso
;
1634 flag_no_nonansi_builtin
= iso
;
1636 cxx_dialect
= cxx0x
;
1639 /* Handle setting implicit to ON. */
1641 set_Wimplicit (int on
)
1644 warn_implicit_int
= on
;
1645 warn_implicit_function_declaration
= on
;
1648 /* Args to -d specify what to dump. Silently ignore
1649 unrecognized options; they may be aimed at toplev.c. */
1651 handle_OPT_d (const char *arg
)
1655 while ((c
= *arg
++) != '\0')
1658 case 'M': /* Dump macros only. */
1659 case 'N': /* Dump names. */
1660 case 'D': /* Dump definitions. */
1661 flag_dump_macros
= c
;
1665 flag_dump_includes
= 1;