1 /* C/ObjC/C++ command line option handling.
2 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007
3 Free Software Foundation, Inc.
4 Contributed by Neil Booth.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 2, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING. If not, write to the Free
20 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
25 #include "coretypes.h"
32 #include "langhooks.h"
33 #include "tree-inline.h"
34 #include "diagnostic.h"
36 #include "cppdefault.h"
37 #include "c-incpath.h"
38 #include "debug.h" /* For debug_hooks. */
43 #ifndef DOLLARS_IN_IDENTIFIERS
44 # define DOLLARS_IN_IDENTIFIERS true
47 #ifndef TARGET_SYSTEM_ROOT
48 # define TARGET_SYSTEM_ROOT NULL
52 #define TARGET_OPTF(ARG)
56 static cpp_options
*cpp_opts
;
59 static const char *this_input_filename
;
61 /* Filename and stream for preprocessed output. */
62 static const char *out_fname
;
63 static FILE *out_stream
;
65 /* Append dependencies to deps_file. */
66 static bool deps_append
;
68 /* If dependency switches (-MF etc.) have been given. */
69 static bool deps_seen
;
74 /* If -lang-fortran seen. */
75 static bool lang_fortran
= false;
77 /* Dependency output file. */
78 static const char *deps_file
;
80 /* The prefix given by -iprefix, if any. */
81 static const char *iprefix
;
83 /* The multilib directory given by -imultilib, if any. */
84 static const char *imultilib
;
86 /* The system root, if any. Overridden by -isysroot. */
87 static const char *sysroot
= TARGET_SYSTEM_ROOT
;
89 /* Zero disables all standard directories for headers. */
90 static bool std_inc
= true;
92 /* Zero disables the C++-specific standard directories for headers. */
93 static bool std_cxx_inc
= true;
95 /* If the quote chain has been split by -I-. */
96 static bool quote_chain_split
;
98 /* If -Wunused-macros. */
99 static bool warn_unused_macros
;
101 /* If -Wvariadic-macros. */
102 static bool warn_variadic_macros
= true;
104 /* Number of deferred options. */
105 static size_t deferred_count
;
107 /* Number of deferred options scanned for -include. */
108 static size_t include_cursor
;
110 static void set_Wimplicit (int);
111 static void handle_OPT_d (const char *);
112 static void set_std_cxx98 (int);
113 static void set_std_cxx0x (int);
114 static void set_std_c89 (int, int);
115 static void set_std_c99 (int);
116 static void check_deps_environment_vars (void);
117 static void handle_deferred_opts (void);
118 static void sanitize_cpp_opts (void);
119 static void add_prefixed_path (const char *, size_t);
120 static void push_command_line_include (void);
121 static void cb_file_change (cpp_reader
*, const struct line_map
*);
122 static void cb_dir_change (cpp_reader
*, const char *);
123 static void finish_options (void);
125 #ifndef STDC_0_IN_SYSTEM_HEADERS
126 #define STDC_0_IN_SYSTEM_HEADERS 0
129 /* Holds switches parsed by c_common_handle_option (), but whose
130 handling is deferred to c_common_post_options (). */
131 static void defer_opt (enum opt_code
, const char *);
132 static struct deferred_opt
138 /* Complain that switch CODE expects an argument but none was
139 provided. OPT was the command-line option. Return FALSE to get
140 the default message in opts.c, TRUE if we provide a specialized
143 c_common_missing_argument (const char *opt
, size_t code
)
148 /* Pick up the default message. */
151 case OPT_fconstant_string_class_
:
152 error ("no class name specified with %qs", opt
);
156 error ("assertion missing after %qs", opt
);
161 error ("macro name missing after %qs", opt
);
170 error ("missing path after %qs", opt
);
179 error ("missing filename after %qs", opt
);
184 error ("missing makefile target after %qs", opt
);
191 /* Defer option CODE with argument ARG. */
193 defer_opt (enum opt_code code
, const char *arg
)
195 deferred_opts
[deferred_count
].code
= code
;
196 deferred_opts
[deferred_count
].arg
= arg
;
200 /* Common initialization before parsing options. */
202 c_common_init_options (unsigned int argc
, const char **argv
)
204 static const unsigned int lang_flags
[] = {CL_C
, CL_ObjC
, CL_CXX
, CL_ObjCXX
};
205 unsigned int i
, result
;
207 /* This is conditionalized only because that is the way the front
208 ends used to do it. Maybe this should be unconditional? */
209 if (c_dialect_cxx ())
211 /* By default wrap lines at 80 characters. Is getenv
212 ("COLUMNS") preferable? */
213 diagnostic_line_cutoff (global_dc
) = 80;
214 /* By default, emit location information once for every
215 diagnostic message. */
216 diagnostic_prefixing_rule (global_dc
) = DIAGNOSTICS_SHOW_PREFIX_ONCE
;
219 parse_in
= cpp_create_reader (c_dialect_cxx () ? CLK_GNUCXX
: CLK_GNUC89
,
220 ident_hash
, &line_table
);
222 cpp_opts
= cpp_get_options (parse_in
);
223 cpp_opts
->dollars_in_ident
= DOLLARS_IN_IDENTIFIERS
;
224 cpp_opts
->objc
= c_dialect_objc ();
226 /* Reset to avoid warnings on internal definitions. We set it just
227 before passing on command-line options to cpplib. */
228 cpp_opts
->warn_dollars
= 0;
230 flag_exceptions
= c_dialect_cxx ();
231 warn_pointer_arith
= c_dialect_cxx ();
232 warn_write_strings
= c_dialect_cxx();
234 deferred_opts
= XNEWVEC (struct deferred_opt
, argc
);
236 result
= lang_flags
[c_language
];
238 if (c_language
== clk_c
)
240 /* If preprocessing assembly language, accept any of the C-family
241 front end options since the driver may pass them through. */
242 for (i
= 1; i
< argc
; i
++)
243 if (! strcmp (argv
[i
], "-lang-asm"))
245 result
|= CL_C
| CL_ObjC
| CL_CXX
| CL_ObjCXX
;
250 for (i
= 1; i
< argc
; i
++)
251 if (! strcmp (argv
[i
], "-lang-fortran"))
253 result
|= CL_Fortran
;
262 /* Handle switch SCODE with argument ARG. VALUE is true, unless no-
263 form of an -f or -W option was given. Returns 0 if the switch was
264 invalid, a negative number to prevent language-independent
265 processing in toplev.c (a hack necessary for the short-term). */
267 c_common_handle_option (size_t scode
, const char *arg
, int value
)
269 const struct cl_option
*option
= &cl_options
[scode
];
270 enum opt_code code
= (enum opt_code
) scode
;
273 /* Prevent resetting the language standard to a C dialect when the driver
274 has already determined that we're looking at assembler input. */
275 bool preprocessing_asm_p
= (cpp_get_options (parse_in
)->lang
== CLK_ASM
);
280 if (cl_options
[code
].flags
& (CL_C
| CL_CXX
| CL_ObjC
| CL_ObjCXX
))
283 if (lang_fortran
&& (cl_options
[code
].flags
& (CL_Fortran
)))
289 case OPT__output_pch_
:
294 defer_opt (code
, arg
);
298 cpp_opts
->discard_comments
= 0;
302 cpp_opts
->discard_comments
= 0;
303 cpp_opts
->discard_comments_in_macro_exp
= 0;
307 defer_opt (code
, arg
);
311 flag_preprocess_only
= 1;
315 cpp_opts
->print_include_names
= 1;
319 TARGET_OPTF (xstrdup (arg
));
323 if (strcmp (arg
, "-"))
324 add_path (xstrdup (arg
), BRACKET
, 0, true);
327 if (quote_chain_split
)
328 error ("-I- specified twice");
329 quote_chain_split
= true;
330 split_quote_chain ();
331 inform ("obsolete option -I- used, please use -iquote instead");
337 /* When doing dependencies with -M or -MM, suppress normal
338 preprocessed output, but still do -dM etc. as software
339 depends on this. Preprocessed output does occur if -MD, -MMD
340 or environment var dependency generation is used. */
341 cpp_opts
->deps
.style
= (code
== OPT_M
? DEPS_SYSTEM
: DEPS_USER
);
343 cpp_opts
->inhibit_warnings
= 1;
348 cpp_opts
->deps
.style
= (code
== OPT_MD
? DEPS_SYSTEM
: DEPS_USER
);
359 cpp_opts
->deps
.missing_files
= true;
364 cpp_opts
->deps
.phony_targets
= true;
370 defer_opt (code
, arg
);
374 flag_no_line_commands
= 1;
377 case OPT_fworking_directory
:
378 flag_working_directory
= value
;
382 defer_opt (code
, arg
);
388 set_Wimplicit (value
);
389 warn_char_subscripts
= value
;
390 warn_missing_braces
= value
;
391 warn_parentheses
= value
;
392 warn_return_type
= value
;
393 warn_sequence_point
= value
; /* Was C only. */
394 if (c_dialect_cxx ())
395 warn_sign_compare
= value
;
397 warn_strict_aliasing
= value
;
398 warn_address
= value
;
399 warn_strict_overflow
= value
;
400 warn_array_bounds
= value
;
402 /* Only warn about unknown pragmas that are not in system
404 warn_unknown_pragmas
= value
;
406 /* We save the value of warn_uninitialized, since if they put
407 -Wuninitialized on the command line, we need to generate a
408 warning about not using it without also specifying -O. */
409 if (warn_uninitialized
!= 1)
410 warn_uninitialized
= (value
? 2 : 0);
412 if (!c_dialect_cxx ())
413 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding
414 can turn it off only if it's not explicit. */
415 warn_main
= value
* 2;
418 /* C++-specific warnings. */
419 warn_reorder
= value
;
420 warn_nontemplate_friend
= value
;
421 warn_cxx0x_compat
= value
;
423 warn_write_strings
= true;
426 cpp_opts
->warn_trigraphs
= value
;
427 cpp_opts
->warn_comments
= value
;
428 cpp_opts
->warn_num_sign_change
= value
;
429 cpp_opts
->warn_multichar
= value
; /* Was C++ only. */
431 if (warn_pointer_sign
== -1)
432 warn_pointer_sign
= 1;
437 cpp_opts
->warn_comments
= value
;
440 case OPT_Wdeprecated
:
441 cpp_opts
->warn_deprecated
= value
;
444 case OPT_Wendif_labels
:
445 cpp_opts
->warn_endif_labels
= value
;
449 cpp_opts
->warnings_are_errors
= value
;
450 global_dc
->warning_as_error_requested
= value
;
453 case OPT_Werror_implicit_function_declaration
:
454 /* For backward compatibility, this is the same as
455 -Werror=implicit-function-declaration. */
456 enable_warning_as_error ("implicit-function-declaration", value
, CL_C
| CL_ObjC
);
464 set_Wformat (atoi (arg
));
468 set_Wimplicit (value
);
472 /* Silently ignore for now. */
475 case OPT_Winvalid_pch
:
476 cpp_opts
->warn_invalid_pch
= value
;
486 case OPT_Wmissing_include_dirs
:
487 cpp_opts
->warn_missing_include_dirs
= value
;
491 cpp_opts
->warn_multichar
= value
;
494 case OPT_Wnormalized_
:
495 if (!value
|| (arg
&& strcasecmp (arg
, "none") == 0))
496 cpp_opts
->warn_normalize
= normalized_none
;
497 else if (!arg
|| strcasecmp (arg
, "nfkc") == 0)
498 cpp_opts
->warn_normalize
= normalized_KC
;
499 else if (strcasecmp (arg
, "id") == 0)
500 cpp_opts
->warn_normalize
= normalized_identifier_C
;
501 else if (strcasecmp (arg
, "nfc") == 0)
502 cpp_opts
->warn_normalize
= normalized_C
;
504 error ("argument %qs to %<-Wnormalized%> not recognized", arg
);
507 case OPT_Wreturn_type
:
508 warn_return_type
= value
;
511 case OPT_Wstrict_null_sentinel
:
512 warn_strict_null_sentinel
= value
;
515 case OPT_Wsystem_headers
:
516 cpp_opts
->warn_system_headers
= value
;
519 case OPT_Wtraditional
:
520 cpp_opts
->warn_traditional
= value
;
524 cpp_opts
->warn_trigraphs
= value
;
528 cpp_opts
->warn_undef
= value
;
531 case OPT_Wunknown_pragmas
:
532 /* Set to greater than 1, so that even unknown pragmas in
533 system headers will be warned about. */
534 warn_unknown_pragmas
= value
* 2;
537 case OPT_Wunused_macros
:
538 warn_unused_macros
= value
;
541 case OPT_Wvariadic_macros
:
542 warn_variadic_macros
= value
;
545 case OPT_Wwrite_strings
:
546 warn_write_strings
= value
;
552 warn_nonvdtor
= true;
556 if (!c_dialect_cxx ())
557 set_std_c89 (false, true);
559 set_std_cxx98 (true);
566 case OPT_fcond_mismatch
:
567 if (!c_dialect_cxx ())
569 flag_cond_mismatch
= value
;
574 case OPT_fall_virtual
:
575 case OPT_falt_external_templates
:
576 case OPT_fenum_int_equiv
:
577 case OPT_fexternal_templates
:
578 case OPT_fguiding_decls
:
580 case OPT_fhuge_objects
:
582 case OPT_fname_mangling_version_
:
584 case OPT_fnonnull_objects
:
586 case OPT_fstrict_prototype
:
587 case OPT_fthis_is_variable
:
588 case OPT_fvtable_thunks
:
591 warning (0, "switch %qs is no longer supported", option
->opt_text
);
594 case OPT_faccess_control
:
595 flag_access_control
= value
;
599 flag_no_asm
= !value
;
603 flag_no_builtin
= !value
;
610 disable_builtin_function (arg
);
613 case OPT_fdollars_in_identifiers
:
614 cpp_opts
->dollars_in_ident
= value
;
617 case OPT_ffreestanding
:
619 /* Fall through.... */
622 flag_no_builtin
= !value
;
623 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
624 if (!value
&& warn_main
== 2)
628 case OPT_fshort_double
:
629 flag_short_double
= value
;
632 case OPT_fshort_enums
:
633 flag_short_enums
= value
;
636 case OPT_fshort_wchar
:
637 flag_short_wchar
= value
;
640 case OPT_fsigned_bitfields
:
641 flag_signed_bitfields
= value
;
644 case OPT_fsigned_char
:
645 flag_signed_char
= value
;
648 case OPT_funsigned_bitfields
:
649 flag_signed_bitfields
= !value
;
652 case OPT_funsigned_char
:
653 flag_signed_char
= !value
;
657 flag_check_new
= value
;
660 case OPT_fconserve_space
:
661 flag_conserve_space
= value
;
664 case OPT_fconstant_string_class_
:
665 constant_string_class_name
= arg
;
668 case OPT_fdefault_inline
:
669 flag_default_inline
= value
;
672 case OPT_felide_constructors
:
673 flag_elide_constructors
= value
;
676 case OPT_fenforce_eh_specs
:
677 flag_enforce_eh_specs
= value
;
680 case OPT_fextended_identifiers
:
681 cpp_opts
->extended_identifiers
= value
;
685 flag_new_for_scope
= value
;
688 case OPT_fgnu_keywords
:
689 flag_no_gnu_keywords
= !value
;
692 case OPT_fgnu_runtime
:
693 flag_next_runtime
= !value
;
696 case OPT_fhandle_exceptions
:
697 warning (0, "-fhandle-exceptions has been renamed -fexceptions (and is now on by default)");
698 flag_exceptions
= value
;
701 case OPT_fimplement_inlines
:
702 flag_implement_inlines
= value
;
705 case OPT_fimplicit_inline_templates
:
706 flag_implicit_inline_templates
= value
;
709 case OPT_fimplicit_templates
:
710 flag_implicit_templates
= value
;
713 case OPT_flax_vector_conversions
:
714 flag_lax_vector_conversions
= value
;
717 case OPT_fms_extensions
:
718 flag_ms_extensions
= value
;
721 case OPT_fnext_runtime
:
722 flag_next_runtime
= value
;
725 case OPT_fnil_receivers
:
726 flag_nil_receivers
= value
;
729 case OPT_fnonansi_builtins
:
730 flag_no_nonansi_builtin
= !value
;
733 case OPT_foperator_names
:
734 cpp_opts
->operator_names
= value
;
737 case OPT_foptional_diags
:
738 flag_optional_diags
= value
;
742 cpp_opts
->restore_pch_deps
= value
;
745 case OPT_fpch_preprocess
:
746 flag_pch_preprocess
= value
;
749 case OPT_fpermissive
:
750 flag_permissive
= value
;
753 case OPT_fpreprocessed
:
754 cpp_opts
->preprocessed
= value
;
757 case OPT_freplace_objc_classes
:
758 flag_replace_objc_classes
= value
;
762 flag_use_repository
= value
;
764 flag_implicit_templates
= 0;
771 case OPT_fshow_column
:
772 cpp_opts
->show_column
= value
;
776 flag_detailed_statistics
= value
;
780 /* It is documented that we silently ignore silly values. */
781 if (value
>= 1 && value
<= 100)
782 cpp_opts
->tabstop
= value
;
785 case OPT_fexec_charset_
:
786 cpp_opts
->narrow_charset
= arg
;
789 case OPT_fwide_exec_charset_
:
790 cpp_opts
->wide_charset
= arg
;
793 case OPT_finput_charset_
:
794 cpp_opts
->input_charset
= arg
;
797 case OPT_ftemplate_depth_
:
798 max_tinst_depth
= value
;
801 case OPT_fuse_cxa_atexit
:
802 flag_use_cxa_atexit
= value
;
805 case OPT_fuse_cxa_get_exception_ptr
:
806 flag_use_cxa_get_exception_ptr
= value
;
809 case OPT_fvisibility_inlines_hidden
:
810 visibility_options
.inlines_hidden
= value
;
817 case OPT_fthreadsafe_statics
:
818 flag_threadsafe_statics
= value
;
822 flag_zero_link
= value
;
826 flag_gen_declaration
= 1;
830 add_path (xstrdup (arg
), AFTER
, 0, true);
835 defer_opt (code
, arg
);
847 add_path (xstrdup (arg
), QUOTE
, 0, true);
855 add_path (xstrdup (arg
), SYSTEM
, 0, true);
858 case OPT_iwithprefix
:
859 add_prefixed_path (arg
, SYSTEM
);
862 case OPT_iwithprefixbefore
:
863 add_prefixed_path (arg
, BRACKET
);
867 cpp_set_lang (parse_in
, CLK_ASM
);
868 cpp_opts
->dollars_in_ident
= false;
871 case OPT_lang_fortran
:
891 error ("output filename specified twice");
894 /* We need to handle the -pedantic switches here, rather than in
895 c_common_post_options, so that a subsequent -Wno-endif-labels
896 is not overridden. */
897 case OPT_pedantic_errors
:
898 cpp_opts
->pedantic_errors
= 1;
901 cpp_opts
->pedantic
= 1;
902 cpp_opts
->warn_endif_labels
= 1;
903 if (warn_pointer_sign
== -1)
904 warn_pointer_sign
= 1;
905 if (warn_overlength_strings
== -1)
906 warn_overlength_strings
= 1;
909 case OPT_print_objc_runtime_info
:
910 print_struct_values
= 1;
913 case OPT_print_pch_checksum
:
914 c_common_print_pch_checksum (stdout
);
915 exit_after_options
= true;
923 case OPT_std_gnu__98
:
924 if (!preprocessing_asm_p
)
925 set_std_cxx98 (code
== OPT_std_c__98
/* ISO */);
929 case OPT_std_gnu__0x
:
930 if (!preprocessing_asm_p
)
931 set_std_cxx0x (code
== OPT_std_c__0x
/* ISO */);
935 case OPT_std_iso9899_1990
:
936 case OPT_std_iso9899_199409
:
937 if (!preprocessing_asm_p
)
938 set_std_c89 (code
== OPT_std_iso9899_199409
/* c94 */, true /* ISO */);
942 if (!preprocessing_asm_p
)
943 set_std_c89 (false /* c94 */, false /* ISO */);
948 case OPT_std_iso9899_1999
:
949 case OPT_std_iso9899_199x
:
950 if (!preprocessing_asm_p
)
951 set_std_c99 (true /* ISO */);
956 if (!preprocessing_asm_p
)
957 set_std_c99 (false /* ISO */);
961 cpp_opts
->trigraphs
= 1;
964 case OPT_traditional_cpp
:
965 cpp_opts
->traditional
= 1;
973 cpp_opts
->inhibit_warnings
= 1;
984 /* Post-switch processing. */
986 c_common_post_options (const char **pfilename
)
988 struct cpp_callbacks
*cb
;
990 /* Canonicalize the input and output filenames. */
991 if (in_fnames
== NULL
)
993 in_fnames
= XNEWVEC (const char *, 1);
996 else if (strcmp (in_fnames
[0], "-") == 0)
999 if (out_fname
== NULL
|| !strcmp (out_fname
, "-"))
1002 if (cpp_opts
->deps
.style
== DEPS_NONE
)
1003 check_deps_environment_vars ();
1005 handle_deferred_opts ();
1007 sanitize_cpp_opts ();
1009 register_include_chains (parse_in
, sysroot
, iprefix
, imultilib
,
1010 std_inc
, std_cxx_inc
&& c_dialect_cxx (), verbose
);
1012 #ifdef C_COMMON_OVERRIDE_OPTIONS
1013 /* Some machines may reject certain combinations of C
1014 language-specific options. */
1015 C_COMMON_OVERRIDE_OPTIONS
;
1018 flag_inline_trees
= 1;
1020 /* Use tree inlining. */
1021 if (!flag_no_inline
)
1023 if (flag_inline_functions
)
1024 flag_inline_trees
= 2;
1026 /* If we are given more than one input file, we must use
1027 unit-at-a-time mode. */
1028 if (num_in_fnames
> 1)
1029 flag_unit_at_a_time
= 1;
1031 /* Default to ObjC sjlj exception handling if NeXT runtime. */
1032 if (flag_objc_sjlj_exceptions
< 0)
1033 flag_objc_sjlj_exceptions
= flag_next_runtime
;
1034 if (flag_objc_exceptions
&& !flag_objc_sjlj_exceptions
)
1035 flag_exceptions
= 1;
1037 /* -Wextra implies -Wclobbered, -Wempty-body, -Wsign-compare,
1038 -Wmissing-field-initializers, -Wmissing-parameter-type
1039 -Wold-style-declaration, and -Woverride-init,
1040 but not if explicitly overridden. */
1041 if (warn_clobbered
== -1)
1042 warn_clobbered
= extra_warnings
;
1043 if (warn_empty_body
== -1)
1044 warn_empty_body
= extra_warnings
;
1045 if (warn_sign_compare
== -1)
1046 warn_sign_compare
= extra_warnings
;
1047 if (warn_missing_field_initializers
== -1)
1048 warn_missing_field_initializers
= extra_warnings
;
1049 if (warn_missing_parameter_type
== -1)
1050 warn_missing_parameter_type
= extra_warnings
;
1051 if (warn_old_style_declaration
== -1)
1052 warn_old_style_declaration
= extra_warnings
;
1053 if (warn_override_init
== -1)
1054 warn_override_init
= extra_warnings
;
1056 /* -Wpointer_sign is disabled by default, but it is enabled if any
1057 of -Wall or -pedantic are given. */
1058 if (warn_pointer_sign
== -1)
1059 warn_pointer_sign
= 0;
1061 /* -Woverlength-strings is off by default, but is enabled by -pedantic.
1062 It is never enabled in C++, as the minimum limit is not normative
1063 in that standard. */
1064 if (warn_overlength_strings
== -1 || c_dialect_cxx ())
1065 warn_overlength_strings
= 0;
1067 /* Special format checking options don't work without -Wformat; warn if
1071 warning (OPT_Wformat_y2k
,
1072 "-Wformat-y2k ignored without -Wformat");
1073 warning (OPT_Wformat_extra_args
,
1074 "-Wformat-extra-args ignored without -Wformat");
1075 warning (OPT_Wformat_zero_length
,
1076 "-Wformat-zero-length ignored without -Wformat");
1077 warning (OPT_Wformat_nonliteral
,
1078 "-Wformat-nonliteral ignored without -Wformat");
1079 warning (OPT_Wformat_security
,
1080 "-Wformat-security ignored without -Wformat");
1083 /* -Wimplicit-function-declaration is enabled by default for C99. */
1084 if (warn_implicit_function_declaration
== -1)
1085 warn_implicit_function_declaration
= flag_isoc99
;
1087 /* C99 requires special handling of complex multiplication and division;
1088 -ffast-math and -fcx-limited-range are handled in process_options. */
1090 flag_complex_method
= 2;
1092 /* If we're allowing C++0x constructs, don't warn about C++0x
1093 compatibility problems. */
1095 warn_cxx0x_compat
= 0;
1097 if (flag_preprocess_only
)
1099 /* Open the output now. We must do so even if flag_no_output is
1100 on, because there may be other output than from the actual
1101 preprocessing (e.g. from -dM). */
1102 if (out_fname
[0] == '\0')
1103 out_stream
= stdout
;
1105 out_stream
= fopen (out_fname
, "w");
1107 if (out_stream
== NULL
)
1109 fatal_error ("opening output file %s: %m", out_fname
);
1113 if (num_in_fnames
> 1)
1114 error ("too many filenames given. Type %s --help for usage",
1117 init_pp_output (out_stream
);
1123 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1124 input_location
= UNKNOWN_LOCATION
;
1127 cb
= cpp_get_callbacks (parse_in
);
1128 cb
->file_change
= cb_file_change
;
1129 cb
->dir_change
= cb_dir_change
;
1130 cpp_post_options (parse_in
);
1132 input_location
= UNKNOWN_LOCATION
;
1134 /* If an error has occurred in cpplib, note it so we fail
1136 errorcount
+= cpp_errors (parse_in
);
1138 *pfilename
= this_input_filename
1139 = cpp_read_main_file (parse_in
, in_fnames
[0]);
1140 /* Don't do any compilation or preprocessing if there is no input file. */
1141 if (this_input_filename
== NULL
)
1147 if (flag_working_directory
1148 && flag_preprocess_only
&& !flag_no_line_commands
)
1149 pp_dir_change (parse_in
, get_src_pwd ());
1151 return flag_preprocess_only
;
1154 /* Front end initialization common to C, ObjC and C++. */
1156 c_common_init (void)
1158 /* Set up preprocessor arithmetic. Must be done after call to
1159 c_common_nodes_and_builtins for type nodes to be good. */
1160 cpp_opts
->precision
= TYPE_PRECISION (intmax_type_node
);
1161 cpp_opts
->char_precision
= TYPE_PRECISION (char_type_node
);
1162 cpp_opts
->int_precision
= TYPE_PRECISION (integer_type_node
);
1163 cpp_opts
->wchar_precision
= TYPE_PRECISION (wchar_type_node
);
1164 cpp_opts
->unsigned_wchar
= TYPE_UNSIGNED (wchar_type_node
);
1165 cpp_opts
->bytes_big_endian
= BYTES_BIG_ENDIAN
;
1167 /* This can't happen until after wchar_precision and bytes_big_endian
1169 cpp_init_iconv (parse_in
);
1172 c_common_print_pch_checksum (stderr
);
1174 if (flag_preprocess_only
)
1177 preprocess_file (parse_in
);
1181 /* Has to wait until now so that cpplib has its hash table. */
1187 /* Initialize the integrated preprocessor after debug output has been
1188 initialized; loop over each input file. */
1190 c_common_parse_file (int set_yydebug
)
1198 warning(0, "The C parser does not support -dy, option ignored");
1202 "The Objective-C parser does not support -dy, option ignored");
1205 warning(0, "The C++ parser does not support -dy, option ignored");
1209 "The Objective-C++ parser does not support -dy, option ignored");
1218 /* Start the main input file, if the debug writer wants it. */
1219 if (debug_hooks
->start_end_main_source_file
)
1220 (*debug_hooks
->start_source_file
) (0, this_input_filename
);
1227 /* And end the main input file, if the debug writer wants it */
1228 if (debug_hooks
->start_end_main_source_file
)
1229 (*debug_hooks
->end_source_file
) (0);
1230 if (++i
>= num_in_fnames
)
1232 cpp_undef_all (parse_in
);
1234 = cpp_read_main_file (parse_in
, in_fnames
[i
]);
1235 /* If an input file is missing, abandon further compilation.
1236 cpplib has issued a diagnostic. */
1237 if (!this_input_filename
)
1242 /* Common finish hook for the C, ObjC and C++ front ends. */
1244 c_common_finish (void)
1246 FILE *deps_stream
= NULL
;
1248 if (cpp_opts
->deps
.style
!= DEPS_NONE
)
1250 /* If -M or -MM was seen without -MF, default output to the
1253 deps_stream
= out_stream
;
1256 deps_stream
= fopen (deps_file
, deps_append
? "a": "w");
1258 fatal_error ("opening dependency file %s: %m", deps_file
);
1262 /* For performance, avoid tearing down cpplib's internal structures
1263 with cpp_destroy (). */
1264 errorcount
+= cpp_finish (parse_in
, deps_stream
);
1266 if (deps_stream
&& deps_stream
!= out_stream
1267 && (ferror (deps_stream
) || fclose (deps_stream
)))
1268 fatal_error ("closing dependency file %s: %m", deps_file
);
1270 if (out_stream
&& (ferror (out_stream
) || fclose (out_stream
)))
1271 fatal_error ("when writing output to %s: %m", out_fname
);
1274 /* Either of two environment variables can specify output of
1275 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1276 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1277 and DEPS_TARGET is the target to mention in the deps. They also
1278 result in dependency information being appended to the output file
1279 rather than overwriting it, and like Sun's compiler
1280 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1282 check_deps_environment_vars (void)
1286 GET_ENVIRONMENT (spec
, "DEPENDENCIES_OUTPUT");
1288 cpp_opts
->deps
.style
= DEPS_USER
;
1291 GET_ENVIRONMENT (spec
, "SUNPRO_DEPENDENCIES");
1294 cpp_opts
->deps
.style
= DEPS_SYSTEM
;
1295 cpp_opts
->deps
.ignore_main_file
= true;
1301 /* Find the space before the DEPS_TARGET, if there is one. */
1302 char *s
= strchr (spec
, ' ');
1305 /* Let the caller perform MAKE quoting. */
1306 defer_opt (OPT_MT
, s
+ 1);
1310 /* Command line -MF overrides environment variables and default. */
1319 /* Handle deferred command line switches. */
1321 handle_deferred_opts (void)
1326 /* Avoid allocating the deps buffer if we don't need it.
1327 (This flag may be true without there having been -MT or -MQ
1328 options, but we'll still need the deps buffer.) */
1332 deps
= cpp_get_deps (parse_in
);
1334 for (i
= 0; i
< deferred_count
; i
++)
1336 struct deferred_opt
*opt
= &deferred_opts
[i
];
1338 if (opt
->code
== OPT_MT
|| opt
->code
== OPT_MQ
)
1339 deps_add_target (deps
, opt
->arg
, opt
->code
== OPT_MQ
);
1343 /* These settings are appropriate for GCC, but not necessarily so for
1344 cpplib as a library. */
1346 sanitize_cpp_opts (void)
1348 /* If we don't know what style of dependencies to output, complain
1349 if any other dependency switches have been given. */
1350 if (deps_seen
&& cpp_opts
->deps
.style
== DEPS_NONE
)
1351 error ("to generate dependencies you must specify either -M or -MM");
1353 /* -dM and dependencies suppress normal output; do it here so that
1354 the last -d[MDN] switch overrides earlier ones. */
1355 if (flag_dump_macros
== 'M')
1358 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1359 -dM since at least glibc relies on -M -dM to work. */
1360 /* Also, flag_no_output implies flag_no_line_commands, always. */
1363 if (flag_dump_macros
!= 'M')
1364 flag_dump_macros
= 0;
1365 flag_dump_includes
= 0;
1366 flag_no_line_commands
= 1;
1369 cpp_opts
->unsigned_char
= !flag_signed_char
;
1370 cpp_opts
->stdc_0_in_system_headers
= STDC_0_IN_SYSTEM_HEADERS
;
1372 /* We want -Wno-long-long to override -pedantic -std=non-c99
1373 and/or -Wtraditional, whatever the ordering. */
1374 cpp_opts
->warn_long_long
1375 = warn_long_long
&& ((!flag_isoc99
&& pedantic
) || warn_traditional
);
1377 /* Similarly with -Wno-variadic-macros. No check for c99 here, since
1378 this also turns off warnings about GCCs extension. */
1379 cpp_opts
->warn_variadic_macros
1380 = warn_variadic_macros
&& (pedantic
|| warn_traditional
);
1382 /* If we're generating preprocessor output, emit current directory
1383 if explicitly requested or if debugging information is enabled.
1384 ??? Maybe we should only do it for debugging formats that
1385 actually output the current directory? */
1386 if (flag_working_directory
== -1)
1387 flag_working_directory
= (debug_info_level
!= DINFO_LEVEL_NONE
);
1390 /* Add include path with a prefix at the front of its name. */
1392 add_prefixed_path (const char *suffix
, size_t chain
)
1396 size_t prefix_len
, suffix_len
;
1398 suffix_len
= strlen (suffix
);
1399 prefix
= iprefix
? iprefix
: cpp_GCC_INCLUDE_DIR
;
1400 prefix_len
= iprefix
? strlen (iprefix
) : cpp_GCC_INCLUDE_DIR_len
;
1402 path
= (char *) xmalloc (prefix_len
+ suffix_len
+ 1);
1403 memcpy (path
, prefix
, prefix_len
);
1404 memcpy (path
+ prefix_len
, suffix
, suffix_len
);
1405 path
[prefix_len
+ suffix_len
] = '\0';
1407 add_path (path
, chain
, 0, false);
1410 /* Handle -D, -U, -A, -imacros, and the first -include. */
1412 finish_options (void)
1414 if (!cpp_opts
->preprocessed
)
1418 cb_file_change (parse_in
,
1419 linemap_add (&line_table
, LC_RENAME
, 0,
1420 _("<built-in>"), 0));
1422 cpp_init_builtins (parse_in
, flag_hosted
);
1423 c_cpp_builtins (parse_in
);
1425 /* We're about to send user input to cpplib, so make it warn for
1426 things that we previously (when we sent it internal definitions)
1427 told it to not warn.
1429 C99 permits implementation-defined characters in identifiers.
1430 The documented meaning of -std= is to turn off extensions that
1431 conflict with the specified standard, and since a strictly
1432 conforming program cannot contain a '$', we do not condition
1433 their acceptance on the -std= setting. */
1434 cpp_opts
->warn_dollars
= (cpp_opts
->pedantic
&& !cpp_opts
->c99
);
1436 cb_file_change (parse_in
,
1437 linemap_add (&line_table
, LC_RENAME
, 0,
1438 _("<command-line>"), 0));
1440 for (i
= 0; i
< deferred_count
; i
++)
1442 struct deferred_opt
*opt
= &deferred_opts
[i
];
1444 if (opt
->code
== OPT_D
)
1445 cpp_define (parse_in
, opt
->arg
);
1446 else if (opt
->code
== OPT_U
)
1447 cpp_undef (parse_in
, opt
->arg
);
1448 else if (opt
->code
== OPT_A
)
1450 if (opt
->arg
[0] == '-')
1451 cpp_unassert (parse_in
, opt
->arg
+ 1);
1453 cpp_assert (parse_in
, opt
->arg
);
1457 /* Handle -imacros after -D and -U. */
1458 for (i
= 0; i
< deferred_count
; i
++)
1460 struct deferred_opt
*opt
= &deferred_opts
[i
];
1462 if (opt
->code
== OPT_imacros
1463 && cpp_push_include (parse_in
, opt
->arg
))
1465 /* Disable push_command_line_include callback for now. */
1466 include_cursor
= deferred_count
+ 1;
1467 cpp_scan_nooutput (parse_in
);
1473 push_command_line_include ();
1476 /* Give CPP the next file given by -include, if any. */
1478 push_command_line_include (void)
1480 while (include_cursor
< deferred_count
)
1482 struct deferred_opt
*opt
= &deferred_opts
[include_cursor
++];
1484 if (!cpp_opts
->preprocessed
&& opt
->code
== OPT_include
1485 && cpp_push_include (parse_in
, opt
->arg
))
1489 if (include_cursor
== deferred_count
)
1492 /* -Wunused-macros should only warn about macros defined hereafter. */
1493 cpp_opts
->warn_unused_macros
= warn_unused_macros
;
1494 /* Restore the line map from <command line>. */
1495 if (!cpp_opts
->preprocessed
)
1496 cpp_change_file (parse_in
, LC_RENAME
, this_input_filename
);
1498 /* Set this here so the client can change the option if it wishes,
1499 and after stacking the main file so we don't trace the main file. */
1500 line_table
.trace_includes
= cpp_opts
->print_include_names
;
1504 /* File change callback. Has to handle -include files. */
1506 cb_file_change (cpp_reader
* ARG_UNUSED (pfile
),
1507 const struct line_map
*new_map
)
1509 if (flag_preprocess_only
)
1510 pp_file_change (new_map
);
1512 fe_file_change (new_map
);
1514 if (new_map
== 0 || (new_map
->reason
== LC_LEAVE
&& MAIN_FILE_P (new_map
)))
1515 push_command_line_include ();
1519 cb_dir_change (cpp_reader
* ARG_UNUSED (pfile
), const char *dir
)
1521 if (!set_src_pwd (dir
))
1522 warning (0, "too late for # directive to set debug directory");
1525 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1526 extensions if ISO). There is no concept of gnu94. */
1528 set_std_c89 (int c94
, int iso
)
1530 cpp_set_lang (parse_in
, c94
? CLK_STDC94
: iso
? CLK_STDC89
: CLK_GNUC89
);
1533 flag_no_gnu_keywords
= iso
;
1534 flag_no_nonansi_builtin
= iso
;
1539 /* Set the C 99 standard (without GNU extensions if ISO). */
1541 set_std_c99 (int iso
)
1543 cpp_set_lang (parse_in
, iso
? CLK_STDC99
: CLK_GNUC99
);
1545 flag_no_nonansi_builtin
= iso
;
1551 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1553 set_std_cxx98 (int iso
)
1555 cpp_set_lang (parse_in
, iso
? CLK_CXX98
: CLK_GNUCXX
);
1556 flag_no_gnu_keywords
= iso
;
1557 flag_no_nonansi_builtin
= iso
;
1561 /* Set the C++ 0x working draft "standard" (without GNU extensions if ISO). */
1563 set_std_cxx0x (int iso
)
1565 cpp_set_lang (parse_in
, iso
? CLK_CXX0X
: CLK_GNUCXX0X
);
1566 flag_no_gnu_keywords
= iso
;
1567 flag_no_nonansi_builtin
= iso
;
1572 /* Handle setting implicit to ON. */
1574 set_Wimplicit (int on
)
1577 warn_implicit_int
= on
;
1578 warn_implicit_function_declaration
= on
;
1581 /* Args to -d specify what to dump. Silently ignore
1582 unrecognized options; they may be aimed at toplev.c. */
1584 handle_OPT_d (const char *arg
)
1588 while ((c
= *arg
++) != '\0')
1591 case 'M': /* Dump macros only. */
1592 case 'N': /* Dump names. */
1593 case 'D': /* Dump definitions. */
1594 flag_dump_macros
= c
;
1598 flag_dump_includes
= 1;