1 /* C/ObjC/C++ command line option handling.
2 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
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"
30 #include "langhooks.h"
31 #include "diagnostic.h"
33 #include "cppdefault.h"
35 #include "debug.h" /* For debug_hooks. */
39 #include "target.h" /* For gcc_targetcm. */
40 #include "tm_p.h" /* For C_COMMON_OVERRIDE_OPTIONS. */
42 #ifndef DOLLARS_IN_IDENTIFIERS
43 # define DOLLARS_IN_IDENTIFIERS true
46 #ifndef TARGET_SYSTEM_ROOT
47 # define TARGET_SYSTEM_ROOT NULL
51 #define TARGET_OPTF(ARG)
55 cpp_options
*cpp_opts
;
58 static const char *this_input_filename
;
60 /* Filename and stream for preprocessed output. */
61 static const char *out_fname
;
62 static FILE *out_stream
;
64 /* Append dependencies to deps_file. */
65 static bool deps_append
;
67 /* If dependency switches (-MF etc.) have been given. */
68 static bool deps_seen
;
73 /* Dependency output file. */
74 static const char *deps_file
;
76 /* The prefix given by -iprefix, if any. */
77 static const char *iprefix
;
79 /* The multilib directory given by -imultilib, if any. */
80 static const char *imultilib
;
82 /* The system root, if any. Overridden by -isysroot. */
83 static const char *sysroot
= TARGET_SYSTEM_ROOT
;
85 /* Zero disables all standard directories for headers. */
86 static bool std_inc
= true;
88 /* Zero disables the C++-specific standard directories for headers. */
89 static bool std_cxx_inc
= true;
91 /* If the quote chain has been split by -I-. */
92 static bool quote_chain_split
;
94 /* If -Wunused-macros. */
95 static bool warn_unused_macros
;
97 /* If -Wvariadic-macros. */
98 static bool warn_variadic_macros
= true;
100 /* Number of deferred options. */
101 static size_t deferred_count
;
103 /* Number of deferred options scanned for -include. */
104 static size_t include_cursor
;
106 static void handle_OPT_d (const char *);
107 static void set_std_cxx98 (int);
108 static void set_std_cxx0x (int);
109 static void set_std_c89 (int, int);
110 static void set_std_c99 (int);
111 static void set_std_c1x (int);
112 static void check_deps_environment_vars (void);
113 static void handle_deferred_opts (void);
114 static void sanitize_cpp_opts (void);
115 static void add_prefixed_path (const char *, size_t);
116 static void push_command_line_include (void);
117 static void cb_file_change (cpp_reader
*, const struct line_map
*);
118 static void cb_dir_change (cpp_reader
*, const char *);
119 static void finish_options (void);
121 #ifndef STDC_0_IN_SYSTEM_HEADERS
122 #define STDC_0_IN_SYSTEM_HEADERS 0
125 /* Holds switches parsed by c_common_handle_option (), but whose
126 handling is deferred to c_common_post_options (). */
127 static void defer_opt (enum opt_code
, const char *);
128 static struct deferred_opt
135 static const unsigned int
136 c_family_lang_mask
= (CL_C
| CL_CXX
| CL_ObjC
| CL_ObjCXX
);
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 /* -Werror= may set a warning option to enable a warning that is emitted
201 by the preprocessor. Set any corresponding flag in cpp_opts. */
204 warning_as_error_callback (int option_index
)
206 switch (option_index
)
209 /* Ignore options not associated with the preprocessor. */
212 case OPT_Wdeprecated
:
213 cpp_opts
->warn_deprecated
= 1;
218 cpp_opts
->warn_comments
= 1;
222 cpp_opts
->warn_trigraphs
= 1;
226 cpp_opts
->warn_multichar
= 1;
229 case OPT_Wtraditional
:
230 cpp_opts
->warn_traditional
= 1;
234 cpp_opts
->warn_long_long
= 1;
237 case OPT_Wendif_labels
:
238 cpp_opts
->warn_endif_labels
= 1;
241 case OPT_Wvariadic_macros
:
242 /* Set the local flag that is used later to update cpp_opts. */
243 warn_variadic_macros
= 1;
246 case OPT_Wbuiltin_macro_redefined
:
247 cpp_opts
->warn_builtin_macro_redefined
= 1;
251 cpp_opts
->warn_undef
= 1;
254 case OPT_Wunused_macros
:
255 /* Set the local flag that is used later to update cpp_opts. */
256 warn_unused_macros
= 1;
259 case OPT_Wc___compat
:
260 /* Add warnings in the same way as c_common_handle_option below. */
261 if (warn_enum_compare
== -1)
262 warn_enum_compare
= 1;
263 if (warn_jump_misses_init
== -1)
264 warn_jump_misses_init
= 1;
265 cpp_opts
->warn_cxx_operator_names
= 1;
268 case OPT_Wnormalized_
:
269 inform (input_location
, "-Werror=normalized=: Set -Wnormalized=nfc");
270 cpp_opts
->warn_normalize
= normalized_C
;
273 case OPT_Winvalid_pch
:
274 cpp_opts
->warn_invalid_pch
= 1;
278 /* Handled by standard diagnostics using the option's associated
284 /* Return language mask for option parsing. */
286 c_common_option_lang_mask (void)
288 static const unsigned int lang_flags
[] = {CL_C
, CL_ObjC
, CL_CXX
, CL_ObjCXX
};
290 return lang_flags
[c_language
];
293 /* Common diagnostics initialization. */
295 c_common_initialize_diagnostics (diagnostic_context
*context
)
297 /* Register callback for warnings enabled by -Werror=. */
298 register_warning_as_error_callback (warning_as_error_callback
);
300 /* This is conditionalized only because that is the way the front
301 ends used to do it. Maybe this should be unconditional? */
302 if (c_dialect_cxx ())
304 /* By default wrap lines at 80 characters. Is getenv
305 ("COLUMNS") preferable? */
306 diagnostic_line_cutoff (context
) = 80;
307 /* By default, emit location information once for every
308 diagnostic message. */
309 diagnostic_prefixing_rule (context
) = DIAGNOSTICS_SHOW_PREFIX_ONCE
;
312 context
->opt_permissive
= OPT_fpermissive
;
315 /* Whether options from all C-family languages should be accepted
317 static bool accept_all_c_family_options
= false;
319 /* Return whether to complain about a wrong-language option. */
321 c_common_complain_wrong_lang_p (const struct cl_option
*option
)
323 if (accept_all_c_family_options
324 && (option
->flags
& c_family_lang_mask
))
330 /* Common initialization before calling option handlers. */
332 c_common_init_options (unsigned int decoded_options_count
,
333 struct cl_decoded_option
*decoded_options
)
336 struct cpp_callbacks
*cb
;
338 parse_in
= cpp_create_reader (c_dialect_cxx () ? CLK_GNUCXX
: CLK_GNUC89
,
339 ident_hash
, line_table
);
340 cb
= cpp_get_callbacks (parse_in
);
341 cb
->error
= c_cpp_error
;
343 cpp_opts
= cpp_get_options (parse_in
);
344 cpp_opts
->dollars_in_ident
= DOLLARS_IN_IDENTIFIERS
;
345 cpp_opts
->objc
= c_dialect_objc ();
347 /* Reset to avoid warnings on internal definitions. We set it just
348 before passing on command-line options to cpplib. */
349 cpp_opts
->warn_dollars
= 0;
351 flag_exceptions
= c_dialect_cxx ();
352 warn_pointer_arith
= c_dialect_cxx ();
353 warn_write_strings
= c_dialect_cxx();
354 flag_warn_unused_result
= true;
356 /* By default, C99-like requirements for complex multiply and divide. */
357 flag_complex_method
= 2;
359 deferred_opts
= XNEWVEC (struct deferred_opt
, decoded_options_count
);
361 if (c_language
== clk_c
)
363 /* If preprocessing assembly language, accept any of the C-family
364 front end options since the driver may pass them through. */
365 for (i
= 1; i
< decoded_options_count
; i
++)
366 if (decoded_options
[i
].opt_index
== OPT_lang_asm
)
368 accept_all_c_family_options
= true;
374 /* Handle switch SCODE with argument ARG. VALUE is true, unless no-
375 form of an -f or -W option was given. Returns 0 if the switch was
376 invalid, a negative number to prevent language-independent
377 processing in toplev.c (a hack necessary for the short-term). */
379 c_common_handle_option (size_t scode
, const char *arg
, int value
,
382 const struct cl_option
*option
= &cl_options
[scode
];
383 enum opt_code code
= (enum opt_code
) scode
;
386 /* Prevent resetting the language standard to a C dialect when the driver
387 has already determined that we're looking at assembler input. */
388 bool preprocessing_asm_p
= (cpp_get_options (parse_in
)->lang
== CLK_ASM
);
393 if (cl_options
[code
].flags
& c_family_lang_mask
)
395 if ((option
->flags
& CL_TARGET
)
396 && ! targetcm
.handle_c_option (scode
, arg
, value
))
403 case OPT__output_pch_
:
408 defer_opt (code
, arg
);
412 cpp_opts
->discard_comments
= 0;
416 cpp_opts
->discard_comments
= 0;
417 cpp_opts
->discard_comments_in_macro_exp
= 0;
421 defer_opt (code
, arg
);
425 cpp_opts
->print_include_names
= 1;
429 TARGET_OPTF (xstrdup (arg
));
433 if (strcmp (arg
, "-"))
434 add_path (xstrdup (arg
), BRACKET
, 0, true);
437 if (quote_chain_split
)
438 error ("-I- specified twice");
439 quote_chain_split
= true;
440 split_quote_chain ();
441 inform (input_location
, "obsolete option -I- used, please use -iquote instead");
447 /* When doing dependencies with -M or -MM, suppress normal
448 preprocessed output, but still do -dM etc. as software
449 depends on this. Preprocessed output does occur if -MD, -MMD
450 or environment var dependency generation is used. */
451 cpp_opts
->deps
.style
= (code
== OPT_M
? DEPS_SYSTEM
: DEPS_USER
);
457 cpp_opts
->deps
.style
= (code
== OPT_MD
? DEPS_SYSTEM
: DEPS_USER
);
458 cpp_opts
->deps
.need_preprocessor_output
= true;
469 cpp_opts
->deps
.missing_files
= true;
474 cpp_opts
->deps
.phony_targets
= true;
480 defer_opt (code
, arg
);
484 flag_no_line_commands
= 1;
488 defer_opt (code
, arg
);
494 handle_option (OPT_Wimplicit
, value
, NULL
, c_family_lang_mask
, kind
);
495 warn_char_subscripts
= value
;
496 warn_missing_braces
= value
;
497 warn_parentheses
= value
;
498 warn_return_type
= value
;
499 warn_sequence_point
= value
; /* Was C only. */
501 if (warn_strict_aliasing
== -1)
502 set_Wstrict_aliasing (value
);
503 warn_address
= value
;
504 if (warn_strict_overflow
== -1)
505 warn_strict_overflow
= value
;
506 warn_array_bounds
= value
;
507 warn_volatile_register_var
= value
;
509 /* Only warn about unknown pragmas that are not in system
511 warn_unknown_pragmas
= value
;
513 warn_uninitialized
= value
;
515 if (!c_dialect_cxx ())
517 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding
518 can turn it off only if it's not explicit. */
520 warn_main
= (value
? 2 : 0);
522 /* In C, -Wall turns on -Wenum-compare, which we do here.
523 In C++ it is on by default, which is done in
524 c_common_post_options. */
525 if (warn_enum_compare
== -1)
526 warn_enum_compare
= value
;
530 /* C++-specific warnings. */
531 warn_sign_compare
= value
;
532 warn_reorder
= value
;
533 warn_cxx0x_compat
= value
;
536 cpp_opts
->warn_trigraphs
= value
;
537 cpp_opts
->warn_comments
= value
;
538 cpp_opts
->warn_num_sign_change
= value
;
540 if (warn_pointer_sign
== -1)
541 warn_pointer_sign
= value
;
544 case OPT_Wbuiltin_macro_redefined
:
545 cpp_opts
->warn_builtin_macro_redefined
= value
;
550 cpp_opts
->warn_comments
= value
;
553 case OPT_Wc___compat
:
554 /* Because -Wenum-compare is the default in C++, -Wc++-compat
555 implies -Wenum-compare. */
556 if (warn_enum_compare
== -1 && value
)
557 warn_enum_compare
= value
;
558 /* Because C++ always warns about a goto which misses an
559 initialization, -Wc++-compat turns on -Wjump-misses-init. */
560 if (warn_jump_misses_init
== -1 && value
)
561 warn_jump_misses_init
= value
;
562 cpp_opts
->warn_cxx_operator_names
= value
;
565 case OPT_Wdeprecated
:
566 cpp_opts
->warn_deprecated
= value
;
569 case OPT_Wendif_labels
:
570 cpp_opts
->warn_endif_labels
= value
;
574 global_dc
->warning_as_error_requested
= value
;
577 case OPT_Werror_implicit_function_declaration
:
578 /* For backward compatibility, this is the same as
579 -Werror=implicit-function-declaration. */
580 enable_warning_as_error ("implicit-function-declaration", value
, CL_C
| CL_ObjC
);
588 set_Wformat (atoi (arg
));
592 gcc_assert (value
== 0 || value
== 1);
593 if (warn_implicit_int
== -1)
594 handle_option (OPT_Wimplicit_int
, value
, NULL
,
595 c_family_lang_mask
, kind
);
596 if (warn_implicit_function_declaration
== -1)
597 handle_option (OPT_Wimplicit_function_declaration
, value
, NULL
,
598 c_family_lang_mask
, kind
);
602 /* Silently ignore for now. */
605 case OPT_Winvalid_pch
:
606 cpp_opts
->warn_invalid_pch
= value
;
609 case OPT_Wmissing_include_dirs
:
610 cpp_opts
->warn_missing_include_dirs
= value
;
614 cpp_opts
->warn_multichar
= value
;
617 case OPT_Wnormalized_
:
618 if (!value
|| (arg
&& strcasecmp (arg
, "none") == 0))
619 cpp_opts
->warn_normalize
= normalized_none
;
620 else if (!arg
|| strcasecmp (arg
, "nfkc") == 0)
621 cpp_opts
->warn_normalize
= normalized_KC
;
622 else if (strcasecmp (arg
, "id") == 0)
623 cpp_opts
->warn_normalize
= normalized_identifier_C
;
624 else if (strcasecmp (arg
, "nfc") == 0)
625 cpp_opts
->warn_normalize
= normalized_C
;
627 error ("argument %qs to %<-Wnormalized%> not recognized", arg
);
630 case OPT_Wreturn_type
:
631 warn_return_type
= value
;
634 case OPT_Wtraditional
:
635 cpp_opts
->warn_traditional
= value
;
639 cpp_opts
->warn_trigraphs
= value
;
643 cpp_opts
->warn_undef
= value
;
646 case OPT_Wunknown_pragmas
:
647 /* Set to greater than 1, so that even unknown pragmas in
648 system headers will be warned about. */
649 warn_unknown_pragmas
= value
* 2;
652 case OPT_Wunused_macros
:
653 warn_unused_macros
= value
;
656 case OPT_Wvariadic_macros
:
657 warn_variadic_macros
= value
;
660 case OPT_Wwrite_strings
:
661 warn_write_strings
= value
;
667 warn_nonvdtor
= true;
671 if (!c_dialect_cxx ())
672 set_std_c89 (false, true);
674 set_std_cxx98 (true);
681 case OPT_fcond_mismatch
:
682 if (!c_dialect_cxx ())
684 flag_cond_mismatch
= value
;
689 case OPT_fall_virtual
:
690 case OPT_falt_external_templates
:
691 case OPT_fenum_int_equiv
:
692 case OPT_fexternal_templates
:
693 case OPT_fguiding_decls
:
695 case OPT_fhuge_objects
:
697 case OPT_fname_mangling_version_
:
699 case OPT_fnonnull_objects
:
701 case OPT_fstrict_prototype
:
702 case OPT_fthis_is_variable
:
703 case OPT_fvtable_thunks
:
706 warning (0, "switch %qs is no longer supported", option
->opt_text
);
713 disable_builtin_function (arg
);
716 case OPT_fdirectives_only
:
717 cpp_opts
->directives_only
= value
;
720 case OPT_fdollars_in_identifiers
:
721 cpp_opts
->dollars_in_ident
= value
;
724 case OPT_ffreestanding
:
726 /* Fall through.... */
729 flag_no_builtin
= !value
;
732 case OPT_fconstant_string_class_
:
733 constant_string_class_name
= arg
;
736 case OPT_fdefault_inline
:
740 case OPT_fextended_identifiers
:
741 cpp_opts
->extended_identifiers
= value
;
744 case OPT_fgnu_runtime
:
745 flag_next_runtime
= !value
;
748 case OPT_fhandle_exceptions
:
749 warning (0, "-fhandle-exceptions has been renamed -fexceptions (and is now on by default)");
750 flag_exceptions
= value
;
753 case OPT_fnext_runtime
:
754 flag_next_runtime
= value
;
757 case OPT_foperator_names
:
758 cpp_opts
->operator_names
= value
;
761 case OPT_foptional_diags
:
766 cpp_opts
->restore_pch_deps
= value
;
769 case OPT_fpch_preprocess
:
770 flag_pch_preprocess
= value
;
773 case OPT_fpermissive
:
774 flag_permissive
= value
;
775 global_dc
->permissive
= value
;
778 case OPT_fpreprocessed
:
779 cpp_opts
->preprocessed
= value
;
783 flag_use_repository
= value
;
785 flag_implicit_templates
= 0;
789 /* It is documented that we silently ignore silly values. */
790 if (value
>= 1 && value
<= 100)
791 cpp_opts
->tabstop
= value
;
794 case OPT_fexec_charset_
:
795 cpp_opts
->narrow_charset
= arg
;
798 case OPT_fwide_exec_charset_
:
799 cpp_opts
->wide_charset
= arg
;
802 case OPT_finput_charset_
:
803 cpp_opts
->input_charset
= arg
;
806 case OPT_ftemplate_depth_
:
807 /* Kept for backwards compatibility. */
808 case OPT_ftemplate_depth_eq
:
809 max_tinst_depth
= value
;
812 case OPT_fvisibility_inlines_hidden
:
813 visibility_options
.inlines_hidden
= value
;
816 case OPT_femit_struct_debug_baseonly
:
817 set_struct_debug_option ("base");
820 case OPT_femit_struct_debug_reduced
:
821 set_struct_debug_option ("dir:ord:sys,dir:gen:any,ind:base");
824 case OPT_femit_struct_debug_detailed_
:
825 set_struct_debug_option (arg
);
829 add_path (xstrdup (arg
), AFTER
, 0, true);
834 defer_opt (code
, arg
);
846 add_path (xstrdup (arg
), QUOTE
, 0, true);
854 add_path (xstrdup (arg
), SYSTEM
, 0, true);
857 case OPT_iwithprefix
:
858 add_prefixed_path (arg
, SYSTEM
);
861 case OPT_iwithprefixbefore
:
862 add_prefixed_path (arg
, BRACKET
);
866 cpp_set_lang (parse_in
, CLK_ASM
);
867 cpp_opts
->dollars_in_ident
= false;
882 error ("output filename specified twice");
885 /* We need to handle the -pedantic switches here, rather than in
886 c_common_post_options, so that a subsequent -Wno-endif-labels
887 is not overridden. */
888 case OPT_pedantic_errors
:
890 cpp_opts
->pedantic
= 1;
891 cpp_opts
->warn_endif_labels
= 1;
892 if (warn_pointer_sign
== -1)
893 warn_pointer_sign
= 1;
894 if (warn_overlength_strings
== -1)
895 warn_overlength_strings
= 1;
900 case OPT_print_objc_runtime_info
:
901 print_struct_values
= 1;
904 case OPT_print_pch_checksum
:
905 c_common_print_pch_checksum (stdout
);
906 exit_after_options
= true;
914 case OPT_std_gnu__98
:
915 if (!preprocessing_asm_p
)
916 set_std_cxx98 (code
== OPT_std_c__98
/* ISO */);
920 case OPT_std_gnu__0x
:
921 if (!preprocessing_asm_p
)
922 set_std_cxx0x (code
== OPT_std_c__0x
/* ISO */);
927 case OPT_std_iso9899_1990
:
928 case OPT_std_iso9899_199409
:
929 if (!preprocessing_asm_p
)
930 set_std_c89 (code
== OPT_std_iso9899_199409
/* c94 */, true /* ISO */);
935 if (!preprocessing_asm_p
)
936 set_std_c89 (false /* c94 */, false /* ISO */);
941 case OPT_std_iso9899_1999
:
942 case OPT_std_iso9899_199x
:
943 if (!preprocessing_asm_p
)
944 set_std_c99 (true /* ISO */);
949 if (!preprocessing_asm_p
)
950 set_std_c99 (false /* ISO */);
954 if (!preprocessing_asm_p
)
955 set_std_c1x (true /* ISO */);
959 if (!preprocessing_asm_p
)
960 set_std_c1x (false /* ISO */);
964 cpp_opts
->trigraphs
= 1;
967 case OPT_traditional_cpp
:
968 cpp_opts
->traditional
= 1;
983 /* Post-switch processing. */
985 c_common_post_options (const char **pfilename
)
987 struct cpp_callbacks
*cb
;
989 /* Canonicalize the input and output filenames. */
990 if (in_fnames
== NULL
)
992 in_fnames
= XNEWVEC (const char *, 1);
995 else if (strcmp (in_fnames
[0], "-") == 0)
998 if (out_fname
== NULL
|| !strcmp (out_fname
, "-"))
1001 if (cpp_opts
->deps
.style
== DEPS_NONE
)
1002 check_deps_environment_vars ();
1004 handle_deferred_opts ();
1006 sanitize_cpp_opts ();
1008 register_include_chains (parse_in
, sysroot
, iprefix
, imultilib
,
1009 std_inc
, std_cxx_inc
&& c_dialect_cxx (), verbose
);
1011 #ifdef C_COMMON_OVERRIDE_OPTIONS
1012 /* Some machines may reject certain combinations of C
1013 language-specific options. */
1014 C_COMMON_OVERRIDE_OPTIONS
;
1017 /* Excess precision other than "fast" requires front-end
1019 if (c_dialect_cxx ())
1021 if (flag_excess_precision_cmdline
== EXCESS_PRECISION_STANDARD
1022 && TARGET_FLT_EVAL_METHOD_NON_DEFAULT
)
1023 sorry ("-fexcess-precision=standard for C++");
1024 flag_excess_precision_cmdline
= EXCESS_PRECISION_FAST
;
1026 else if (flag_excess_precision_cmdline
== EXCESS_PRECISION_DEFAULT
)
1027 flag_excess_precision_cmdline
= (flag_iso
1028 ? EXCESS_PRECISION_STANDARD
1029 : EXCESS_PRECISION_FAST
);
1031 /* By default we use C99 inline semantics in GNU99 or C99 mode. C99
1032 inline semantics are not supported in GNU89 or C89 mode. */
1033 if (flag_gnu89_inline
== -1)
1034 flag_gnu89_inline
= !flag_isoc99
;
1035 else if (!flag_gnu89_inline
&& !flag_isoc99
)
1036 error ("-fno-gnu89-inline is only supported in GNU99 or C99 mode");
1038 /* Default to ObjC sjlj exception handling if NeXT runtime. */
1039 if (flag_objc_sjlj_exceptions
< 0)
1040 flag_objc_sjlj_exceptions
= flag_next_runtime
;
1041 if (flag_objc_exceptions
&& !flag_objc_sjlj_exceptions
)
1042 flag_exceptions
= 1;
1044 /* -Wextra implies the following flags
1045 unless explicitly overridden. */
1046 if (warn_type_limits
== -1)
1047 warn_type_limits
= extra_warnings
;
1048 if (warn_clobbered
== -1)
1049 warn_clobbered
= extra_warnings
;
1050 if (warn_empty_body
== -1)
1051 warn_empty_body
= extra_warnings
;
1052 if (warn_sign_compare
== -1)
1053 warn_sign_compare
= extra_warnings
;
1054 if (warn_missing_field_initializers
== -1)
1055 warn_missing_field_initializers
= extra_warnings
;
1056 if (warn_missing_parameter_type
== -1)
1057 warn_missing_parameter_type
= extra_warnings
;
1058 if (warn_old_style_declaration
== -1)
1059 warn_old_style_declaration
= extra_warnings
;
1060 if (warn_override_init
== -1)
1061 warn_override_init
= extra_warnings
;
1062 if (warn_ignored_qualifiers
== -1)
1063 warn_ignored_qualifiers
= extra_warnings
;
1065 /* -Wpointer-sign is disabled by default, but it is enabled if any
1066 of -Wall or -pedantic are given. */
1067 if (warn_pointer_sign
== -1)
1068 warn_pointer_sign
= 0;
1070 if (warn_strict_aliasing
== -1)
1071 warn_strict_aliasing
= 0;
1072 if (warn_strict_overflow
== -1)
1073 warn_strict_overflow
= 0;
1074 if (warn_jump_misses_init
== -1)
1075 warn_jump_misses_init
= 0;
1077 /* -Woverlength-strings is off by default, but is enabled by -pedantic.
1078 It is never enabled in C++, as the minimum limit is not normative
1079 in that standard. */
1080 if (warn_overlength_strings
== -1 || c_dialect_cxx ())
1081 warn_overlength_strings
= 0;
1083 /* Wmain is enabled by default in C++ but not in C. */
1084 /* Wmain is disabled by default for -ffreestanding (!flag_hosted),
1085 even if -Wall was given (warn_main will be 2 if set by -Wall, 1
1086 if set by -Wmain). */
1087 if (warn_main
== -1)
1088 warn_main
= (c_dialect_cxx () && flag_hosted
) ? 1 : 0;
1089 else if (warn_main
== 2)
1090 warn_main
= flag_hosted
? 1 : 0;
1092 /* In C, -Wconversion enables -Wsign-conversion (unless disabled
1093 through -Wno-sign-conversion). While in C++,
1094 -Wsign-conversion needs to be requested explicitly. */
1095 if (warn_sign_conversion
== -1)
1096 warn_sign_conversion
= (c_dialect_cxx ()) ? 0 : warn_conversion
;
1098 /* In C, -Wall and -Wc++-compat enable -Wenum-compare, which we do
1099 in c_common_handle_option; if it has not yet been set, it is
1100 disabled by default. In C++, it is enabled by default. */
1101 if (warn_enum_compare
== -1)
1102 warn_enum_compare
= c_dialect_cxx () ? 1 : 0;
1104 /* -Wpacked-bitfield-compat is on by default for the C languages. The
1105 warning is issued in stor-layout.c which is not part of the front-end so
1106 we need to selectively turn it on here. */
1107 if (warn_packed_bitfield_compat
== -1)
1108 warn_packed_bitfield_compat
= 1;
1110 /* Special format checking options don't work without -Wformat; warn if
1114 warning (OPT_Wformat_y2k
,
1115 "-Wformat-y2k ignored without -Wformat");
1116 warning (OPT_Wformat_extra_args
,
1117 "-Wformat-extra-args ignored without -Wformat");
1118 warning (OPT_Wformat_zero_length
,
1119 "-Wformat-zero-length ignored without -Wformat");
1120 warning (OPT_Wformat_nonliteral
,
1121 "-Wformat-nonliteral ignored without -Wformat");
1122 warning (OPT_Wformat_contains_nul
,
1123 "-Wformat-contains-nul ignored without -Wformat");
1124 warning (OPT_Wformat_security
,
1125 "-Wformat-security ignored without -Wformat");
1128 if (warn_implicit
== -1)
1131 if (warn_implicit_int
== -1)
1132 warn_implicit_int
= 0;
1134 /* -Wimplicit-function-declaration is enabled by default for C99. */
1135 if (warn_implicit_function_declaration
== -1)
1136 warn_implicit_function_declaration
= flag_isoc99
;
1138 /* If we're allowing C++0x constructs, don't warn about C++0x
1139 compatibility problems. */
1140 if (cxx_dialect
== cxx0x
)
1141 warn_cxx0x_compat
= 0;
1143 if (flag_preprocess_only
)
1145 /* Open the output now. We must do so even if flag_no_output is
1146 on, because there may be other output than from the actual
1147 preprocessing (e.g. from -dM). */
1148 if (out_fname
[0] == '\0')
1149 out_stream
= stdout
;
1151 out_stream
= fopen (out_fname
, "w");
1153 if (out_stream
== NULL
)
1155 fatal_error ("opening output file %s: %m", out_fname
);
1159 if (num_in_fnames
> 1)
1160 error ("too many filenames given. Type %s --help for usage",
1163 init_pp_output (out_stream
);
1169 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1170 input_location
= UNKNOWN_LOCATION
;
1173 cb
= cpp_get_callbacks (parse_in
);
1174 cb
->file_change
= cb_file_change
;
1175 cb
->dir_change
= cb_dir_change
;
1176 cpp_post_options (parse_in
);
1178 input_location
= UNKNOWN_LOCATION
;
1180 *pfilename
= this_input_filename
1181 = cpp_read_main_file (parse_in
, in_fnames
[0]);
1182 /* Don't do any compilation or preprocessing if there is no input file. */
1183 if (this_input_filename
== NULL
)
1189 if (flag_working_directory
1190 && flag_preprocess_only
&& !flag_no_line_commands
)
1191 pp_dir_change (parse_in
, get_src_pwd ());
1193 return flag_preprocess_only
;
1196 /* Front end initialization common to C, ObjC and C++. */
1198 c_common_init (void)
1200 /* Set up preprocessor arithmetic. Must be done after call to
1201 c_common_nodes_and_builtins for type nodes to be good. */
1202 cpp_opts
->precision
= TYPE_PRECISION (intmax_type_node
);
1203 cpp_opts
->char_precision
= TYPE_PRECISION (char_type_node
);
1204 cpp_opts
->int_precision
= TYPE_PRECISION (integer_type_node
);
1205 cpp_opts
->wchar_precision
= TYPE_PRECISION (wchar_type_node
);
1206 cpp_opts
->unsigned_wchar
= TYPE_UNSIGNED (wchar_type_node
);
1207 cpp_opts
->bytes_big_endian
= BYTES_BIG_ENDIAN
;
1209 /* This can't happen until after wchar_precision and bytes_big_endian
1211 cpp_init_iconv (parse_in
);
1214 c_common_print_pch_checksum (stderr
);
1216 /* Has to wait until now so that cpplib has its hash table. */
1219 if (flag_preprocess_only
)
1222 preprocess_file (parse_in
);
1229 /* Initialize the integrated preprocessor after debug output has been
1230 initialized; loop over each input file. */
1232 c_common_parse_file (int set_yydebug
)
1240 warning(0, "The C parser does not support -dy, option ignored");
1244 "The Objective-C parser does not support -dy, option ignored");
1247 warning(0, "The C++ parser does not support -dy, option ignored");
1251 "The Objective-C++ parser does not support -dy, option ignored");
1266 /* And end the main input file, if the debug writer wants it */
1267 if (debug_hooks
->start_end_main_source_file
)
1268 (*debug_hooks
->end_source_file
) (0);
1269 if (++i
>= num_in_fnames
)
1271 cpp_undef_all (parse_in
);
1272 cpp_clear_file_cache (parse_in
);
1274 = cpp_read_main_file (parse_in
, in_fnames
[i
]);
1275 /* If an input file is missing, abandon further compilation.
1276 cpplib has issued a diagnostic. */
1277 if (!this_input_filename
)
1282 /* Common finish hook for the C, ObjC and C++ front ends. */
1284 c_common_finish (void)
1286 FILE *deps_stream
= NULL
;
1288 /* Don't write the deps file if there are errors. */
1289 if (cpp_opts
->deps
.style
!= DEPS_NONE
&& !seen_error ())
1291 /* If -M or -MM was seen without -MF, default output to the
1294 deps_stream
= out_stream
;
1297 deps_stream
= fopen (deps_file
, deps_append
? "a": "w");
1299 fatal_error ("opening dependency file %s: %m", deps_file
);
1303 /* For performance, avoid tearing down cpplib's internal structures
1304 with cpp_destroy (). */
1305 cpp_finish (parse_in
, deps_stream
);
1307 if (deps_stream
&& deps_stream
!= out_stream
1308 && (ferror (deps_stream
) || fclose (deps_stream
)))
1309 fatal_error ("closing dependency file %s: %m", deps_file
);
1311 if (out_stream
&& (ferror (out_stream
) || fclose (out_stream
)))
1312 fatal_error ("when writing output to %s: %m", out_fname
);
1315 /* Either of two environment variables can specify output of
1316 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1317 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1318 and DEPS_TARGET is the target to mention in the deps. They also
1319 result in dependency information being appended to the output file
1320 rather than overwriting it, and like Sun's compiler
1321 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1323 check_deps_environment_vars (void)
1327 GET_ENVIRONMENT (spec
, "DEPENDENCIES_OUTPUT");
1329 cpp_opts
->deps
.style
= DEPS_USER
;
1332 GET_ENVIRONMENT (spec
, "SUNPRO_DEPENDENCIES");
1335 cpp_opts
->deps
.style
= DEPS_SYSTEM
;
1336 cpp_opts
->deps
.ignore_main_file
= true;
1342 /* Find the space before the DEPS_TARGET, if there is one. */
1343 char *s
= strchr (spec
, ' ');
1346 /* Let the caller perform MAKE quoting. */
1347 defer_opt (OPT_MT
, s
+ 1);
1351 /* Command line -MF overrides environment variables and default. */
1360 /* Handle deferred command line switches. */
1362 handle_deferred_opts (void)
1367 /* Avoid allocating the deps buffer if we don't need it.
1368 (This flag may be true without there having been -MT or -MQ
1369 options, but we'll still need the deps buffer.) */
1373 deps
= cpp_get_deps (parse_in
);
1375 for (i
= 0; i
< deferred_count
; i
++)
1377 struct deferred_opt
*opt
= &deferred_opts
[i
];
1379 if (opt
->code
== OPT_MT
|| opt
->code
== OPT_MQ
)
1380 deps_add_target (deps
, opt
->arg
, opt
->code
== OPT_MQ
);
1384 /* These settings are appropriate for GCC, but not necessarily so for
1385 cpplib as a library. */
1387 sanitize_cpp_opts (void)
1389 /* If we don't know what style of dependencies to output, complain
1390 if any other dependency switches have been given. */
1391 if (deps_seen
&& cpp_opts
->deps
.style
== DEPS_NONE
)
1392 error ("to generate dependencies you must specify either -M or -MM");
1394 /* -dM and dependencies suppress normal output; do it here so that
1395 the last -d[MDN] switch overrides earlier ones. */
1396 if (flag_dump_macros
== 'M')
1399 /* By default, -fdirectives-only implies -dD. This allows subsequent phases
1400 to perform proper macro expansion. */
1401 if (cpp_opts
->directives_only
&& !cpp_opts
->preprocessed
&& !flag_dump_macros
)
1402 flag_dump_macros
= 'D';
1404 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1405 -dM since at least glibc relies on -M -dM to work. */
1406 /* Also, flag_no_output implies flag_no_line_commands, always. */
1409 if (flag_dump_macros
!= 'M')
1410 flag_dump_macros
= 0;
1411 flag_dump_includes
= 0;
1412 flag_no_line_commands
= 1;
1414 else if (cpp_opts
->deps
.missing_files
)
1415 error ("-MG may only be used with -M or -MM");
1417 cpp_opts
->unsigned_char
= !flag_signed_char
;
1418 cpp_opts
->stdc_0_in_system_headers
= STDC_0_IN_SYSTEM_HEADERS
;
1420 /* Wlong-long is disabled by default. It is enabled by:
1421 [-pedantic | -Wtraditional] -std=[gnu|c]++98 ; or
1422 [-pedantic | -Wtraditional] -std=non-c99 .
1424 Either -Wlong-long or -Wno-long-long override any other settings. */
1425 if (warn_long_long
== -1)
1426 warn_long_long
= ((pedantic
|| warn_traditional
)
1427 && (c_dialect_cxx () ? cxx_dialect
== cxx98
: !flag_isoc99
));
1428 cpp_opts
->warn_long_long
= warn_long_long
;
1430 /* Similarly with -Wno-variadic-macros. No check for c99 here, since
1431 this also turns off warnings about GCCs extension. */
1432 cpp_opts
->warn_variadic_macros
1433 = warn_variadic_macros
&& (pedantic
|| warn_traditional
);
1435 /* If we're generating preprocessor output, emit current directory
1436 if explicitly requested or if debugging information is enabled.
1437 ??? Maybe we should only do it for debugging formats that
1438 actually output the current directory? */
1439 if (flag_working_directory
== -1)
1440 flag_working_directory
= (debug_info_level
!= DINFO_LEVEL_NONE
);
1442 if (cpp_opts
->directives_only
)
1444 if (warn_unused_macros
)
1445 error ("-fdirectives-only is incompatible with -Wunused_macros");
1446 if (cpp_opts
->traditional
)
1447 error ("-fdirectives-only is incompatible with -traditional");
1451 /* Add include path with a prefix at the front of its name. */
1453 add_prefixed_path (const char *suffix
, size_t chain
)
1457 size_t prefix_len
, suffix_len
;
1459 suffix_len
= strlen (suffix
);
1460 prefix
= iprefix
? iprefix
: cpp_GCC_INCLUDE_DIR
;
1461 prefix_len
= iprefix
? strlen (iprefix
) : cpp_GCC_INCLUDE_DIR_len
;
1463 path
= (char *) xmalloc (prefix_len
+ suffix_len
+ 1);
1464 memcpy (path
, prefix
, prefix_len
);
1465 memcpy (path
+ prefix_len
, suffix
, suffix_len
);
1466 path
[prefix_len
+ suffix_len
] = '\0';
1468 add_path (path
, chain
, 0, false);
1471 /* Handle -D, -U, -A, -imacros, and the first -include. */
1473 finish_options (void)
1475 if (!cpp_opts
->preprocessed
)
1479 cb_file_change (parse_in
,
1480 linemap_add (line_table
, LC_RENAME
, 0,
1481 _("<built-in>"), 0));
1483 cpp_init_builtins (parse_in
, flag_hosted
);
1484 c_cpp_builtins (parse_in
);
1486 /* We're about to send user input to cpplib, so make it warn for
1487 things that we previously (when we sent it internal definitions)
1488 told it to not warn.
1490 C99 permits implementation-defined characters in identifiers.
1491 The documented meaning of -std= is to turn off extensions that
1492 conflict with the specified standard, and since a strictly
1493 conforming program cannot contain a '$', we do not condition
1494 their acceptance on the -std= setting. */
1495 cpp_opts
->warn_dollars
= (cpp_opts
->pedantic
&& !cpp_opts
->c99
);
1497 cb_file_change (parse_in
,
1498 linemap_add (line_table
, LC_RENAME
, 0,
1499 _("<command-line>"), 0));
1501 for (i
= 0; i
< deferred_count
; i
++)
1503 struct deferred_opt
*opt
= &deferred_opts
[i
];
1505 if (opt
->code
== OPT_D
)
1506 cpp_define (parse_in
, opt
->arg
);
1507 else if (opt
->code
== OPT_U
)
1508 cpp_undef (parse_in
, opt
->arg
);
1509 else if (opt
->code
== OPT_A
)
1511 if (opt
->arg
[0] == '-')
1512 cpp_unassert (parse_in
, opt
->arg
+ 1);
1514 cpp_assert (parse_in
, opt
->arg
);
1518 /* Start the main input file, if the debug writer wants it. */
1519 if (debug_hooks
->start_end_main_source_file
1520 && !flag_preprocess_only
)
1521 (*debug_hooks
->start_source_file
) (0, this_input_filename
);
1523 /* Handle -imacros after -D and -U. */
1524 for (i
= 0; i
< deferred_count
; i
++)
1526 struct deferred_opt
*opt
= &deferred_opts
[i
];
1528 if (opt
->code
== OPT_imacros
1529 && cpp_push_include (parse_in
, opt
->arg
))
1531 /* Disable push_command_line_include callback for now. */
1532 include_cursor
= deferred_count
+ 1;
1533 cpp_scan_nooutput (parse_in
);
1539 if (cpp_opts
->directives_only
)
1540 cpp_init_special_builtins (parse_in
);
1542 /* Start the main input file, if the debug writer wants it. */
1543 if (debug_hooks
->start_end_main_source_file
1544 && !flag_preprocess_only
)
1545 (*debug_hooks
->start_source_file
) (0, this_input_filename
);
1549 push_command_line_include ();
1552 /* Give CPP the next file given by -include, if any. */
1554 push_command_line_include (void)
1556 while (include_cursor
< deferred_count
)
1558 struct deferred_opt
*opt
= &deferred_opts
[include_cursor
++];
1560 if (!cpp_opts
->preprocessed
&& opt
->code
== OPT_include
1561 && cpp_push_include (parse_in
, opt
->arg
))
1565 if (include_cursor
== deferred_count
)
1568 /* -Wunused-macros should only warn about macros defined hereafter. */
1569 cpp_opts
->warn_unused_macros
= warn_unused_macros
;
1570 /* Restore the line map from <command line>. */
1571 if (!cpp_opts
->preprocessed
)
1572 cpp_change_file (parse_in
, LC_RENAME
, this_input_filename
);
1574 /* Set this here so the client can change the option if it wishes,
1575 and after stacking the main file so we don't trace the main file. */
1576 line_table
->trace_includes
= cpp_opts
->print_include_names
;
1580 /* File change callback. Has to handle -include files. */
1582 cb_file_change (cpp_reader
* ARG_UNUSED (pfile
),
1583 const struct line_map
*new_map
)
1585 if (flag_preprocess_only
)
1586 pp_file_change (new_map
);
1588 fe_file_change (new_map
);
1590 if (new_map
== 0 || (new_map
->reason
== LC_LEAVE
&& MAIN_FILE_P (new_map
)))
1591 push_command_line_include ();
1595 cb_dir_change (cpp_reader
* ARG_UNUSED (pfile
), const char *dir
)
1597 if (!set_src_pwd (dir
))
1598 warning (0, "too late for # directive to set debug directory");
1601 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1602 extensions if ISO). There is no concept of gnu94. */
1604 set_std_c89 (int c94
, int iso
)
1606 cpp_set_lang (parse_in
, c94
? CLK_STDC94
: iso
? CLK_STDC89
: CLK_GNUC89
);
1609 flag_no_gnu_keywords
= iso
;
1610 flag_no_nonansi_builtin
= iso
;
1616 /* Set the C 99 standard (without GNU extensions if ISO). */
1618 set_std_c99 (int iso
)
1620 cpp_set_lang (parse_in
, iso
? CLK_STDC99
: CLK_GNUC99
);
1622 flag_no_nonansi_builtin
= iso
;
1629 /* Set the C 1X standard draft (without GNU extensions if ISO). */
1631 set_std_c1x (int iso
)
1633 cpp_set_lang (parse_in
, iso
? CLK_STDC1X
: CLK_GNUC1X
);
1635 flag_no_nonansi_builtin
= iso
;
1642 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1644 set_std_cxx98 (int iso
)
1646 cpp_set_lang (parse_in
, iso
? CLK_CXX98
: CLK_GNUCXX
);
1647 flag_no_gnu_keywords
= iso
;
1648 flag_no_nonansi_builtin
= iso
;
1650 cxx_dialect
= cxx98
;
1653 /* Set the C++ 0x working draft "standard" (without GNU extensions if ISO). */
1655 set_std_cxx0x (int iso
)
1657 cpp_set_lang (parse_in
, iso
? CLK_CXX0X
: CLK_GNUCXX0X
);
1658 flag_no_gnu_keywords
= iso
;
1659 flag_no_nonansi_builtin
= iso
;
1661 cxx_dialect
= cxx0x
;
1664 /* Args to -d specify what to dump. Silently ignore
1665 unrecognized options; they may be aimed at toplev.c. */
1667 handle_OPT_d (const char *arg
)
1671 while ((c
= *arg
++) != '\0')
1674 case 'M': /* Dump macros only. */
1675 case 'N': /* Dump names. */
1676 case 'D': /* Dump definitions. */
1677 case 'U': /* Dump used macros. */
1678 flag_dump_macros
= c
;
1682 flag_dump_includes
= 1;