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 /* Common initialization before parsing options. */
286 c_common_init_options (unsigned int argc
, const char **argv
)
288 static const unsigned int lang_flags
[] = {CL_C
, CL_ObjC
, CL_CXX
, CL_ObjCXX
};
289 unsigned int i
, result
;
290 struct cpp_callbacks
*cb
;
292 /* Register callback for warnings enabled by -Werror=. */
293 register_warning_as_error_callback (warning_as_error_callback
);
295 /* This is conditionalized only because that is the way the front
296 ends used to do it. Maybe this should be unconditional? */
297 if (c_dialect_cxx ())
299 /* By default wrap lines at 80 characters. Is getenv
300 ("COLUMNS") preferable? */
301 diagnostic_line_cutoff (global_dc
) = 80;
302 /* By default, emit location information once for every
303 diagnostic message. */
304 diagnostic_prefixing_rule (global_dc
) = DIAGNOSTICS_SHOW_PREFIX_ONCE
;
307 global_dc
->opt_permissive
= OPT_fpermissive
;
309 parse_in
= cpp_create_reader (c_dialect_cxx () ? CLK_GNUCXX
: CLK_GNUC89
,
310 ident_hash
, line_table
);
311 cb
= cpp_get_callbacks (parse_in
);
312 cb
->error
= c_cpp_error
;
314 cpp_opts
= cpp_get_options (parse_in
);
315 cpp_opts
->dollars_in_ident
= DOLLARS_IN_IDENTIFIERS
;
316 cpp_opts
->objc
= c_dialect_objc ();
318 /* Reset to avoid warnings on internal definitions. We set it just
319 before passing on command-line options to cpplib. */
320 cpp_opts
->warn_dollars
= 0;
322 flag_exceptions
= c_dialect_cxx ();
323 warn_pointer_arith
= c_dialect_cxx ();
324 warn_write_strings
= c_dialect_cxx();
325 flag_warn_unused_result
= true;
327 /* By default, C99-like requirements for complex multiply and divide. */
328 flag_complex_method
= 2;
330 deferred_opts
= XNEWVEC (struct deferred_opt
, argc
);
332 result
= lang_flags
[c_language
];
334 if (c_language
== clk_c
)
336 /* If preprocessing assembly language, accept any of the C-family
337 front end options since the driver may pass them through. */
338 for (i
= 1; i
< argc
; i
++)
339 if (! strcmp (argv
[i
], "-lang-asm"))
341 result
|= CL_C
| CL_ObjC
| CL_CXX
| CL_ObjCXX
;
349 /* Handle switch SCODE with argument ARG. VALUE is true, unless no-
350 form of an -f or -W option was given. Returns 0 if the switch was
351 invalid, a negative number to prevent language-independent
352 processing in toplev.c (a hack necessary for the short-term). */
354 c_common_handle_option (size_t scode
, const char *arg
, int value
,
357 const struct cl_option
*option
= &cl_options
[scode
];
358 enum opt_code code
= (enum opt_code
) scode
;
361 /* Prevent resetting the language standard to a C dialect when the driver
362 has already determined that we're looking at assembler input. */
363 bool preprocessing_asm_p
= (cpp_get_options (parse_in
)->lang
== CLK_ASM
);
368 if (cl_options
[code
].flags
& c_family_lang_mask
)
370 if ((option
->flags
& CL_TARGET
)
371 && ! targetcm
.handle_c_option (scode
, arg
, value
))
378 case OPT__output_pch_
:
383 defer_opt (code
, arg
);
387 cpp_opts
->discard_comments
= 0;
391 cpp_opts
->discard_comments
= 0;
392 cpp_opts
->discard_comments_in_macro_exp
= 0;
396 defer_opt (code
, arg
);
400 cpp_opts
->print_include_names
= 1;
404 TARGET_OPTF (xstrdup (arg
));
408 if (strcmp (arg
, "-"))
409 add_path (xstrdup (arg
), BRACKET
, 0, true);
412 if (quote_chain_split
)
413 error ("-I- specified twice");
414 quote_chain_split
= true;
415 split_quote_chain ();
416 inform (input_location
, "obsolete option -I- used, please use -iquote instead");
422 /* When doing dependencies with -M or -MM, suppress normal
423 preprocessed output, but still do -dM etc. as software
424 depends on this. Preprocessed output does occur if -MD, -MMD
425 or environment var dependency generation is used. */
426 cpp_opts
->deps
.style
= (code
== OPT_M
? DEPS_SYSTEM
: DEPS_USER
);
432 cpp_opts
->deps
.style
= (code
== OPT_MD
? DEPS_SYSTEM
: DEPS_USER
);
433 cpp_opts
->deps
.need_preprocessor_output
= true;
444 cpp_opts
->deps
.missing_files
= true;
449 cpp_opts
->deps
.phony_targets
= true;
455 defer_opt (code
, arg
);
459 flag_no_line_commands
= 1;
463 defer_opt (code
, arg
);
469 handle_option (OPT_Wimplicit
, value
, NULL
, c_family_lang_mask
, kind
);
470 warn_char_subscripts
= value
;
471 warn_missing_braces
= value
;
472 warn_parentheses
= value
;
473 warn_return_type
= value
;
474 warn_sequence_point
= value
; /* Was C only. */
476 if (warn_strict_aliasing
== -1)
477 set_Wstrict_aliasing (value
);
478 warn_address
= value
;
479 if (warn_strict_overflow
== -1)
480 warn_strict_overflow
= value
;
481 warn_array_bounds
= value
;
482 warn_volatile_register_var
= value
;
484 /* Only warn about unknown pragmas that are not in system
486 warn_unknown_pragmas
= value
;
488 warn_uninitialized
= value
;
490 if (!c_dialect_cxx ())
492 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding
493 can turn it off only if it's not explicit. */
495 warn_main
= (value
? 2 : 0);
497 /* In C, -Wall turns on -Wenum-compare, which we do here.
498 In C++ it is on by default, which is done in
499 c_common_post_options. */
500 if (warn_enum_compare
== -1)
501 warn_enum_compare
= value
;
505 /* C++-specific warnings. */
506 warn_sign_compare
= value
;
507 warn_reorder
= value
;
508 warn_cxx0x_compat
= value
;
511 cpp_opts
->warn_trigraphs
= value
;
512 cpp_opts
->warn_comments
= value
;
513 cpp_opts
->warn_num_sign_change
= value
;
515 if (warn_pointer_sign
== -1)
516 warn_pointer_sign
= value
;
519 case OPT_Wbuiltin_macro_redefined
:
520 cpp_opts
->warn_builtin_macro_redefined
= value
;
525 cpp_opts
->warn_comments
= value
;
528 case OPT_Wc___compat
:
529 /* Because -Wenum-compare is the default in C++, -Wc++-compat
530 implies -Wenum-compare. */
531 if (warn_enum_compare
== -1 && value
)
532 warn_enum_compare
= value
;
533 /* Because C++ always warns about a goto which misses an
534 initialization, -Wc++-compat turns on -Wjump-misses-init. */
535 if (warn_jump_misses_init
== -1 && value
)
536 warn_jump_misses_init
= value
;
537 cpp_opts
->warn_cxx_operator_names
= value
;
540 case OPT_Wdeprecated
:
541 cpp_opts
->warn_deprecated
= value
;
544 case OPT_Wendif_labels
:
545 cpp_opts
->warn_endif_labels
= value
;
549 global_dc
->warning_as_error_requested
= value
;
552 case OPT_Werror_implicit_function_declaration
:
553 /* For backward compatibility, this is the same as
554 -Werror=implicit-function-declaration. */
555 enable_warning_as_error ("implicit-function-declaration", value
, CL_C
| CL_ObjC
);
563 set_Wformat (atoi (arg
));
567 gcc_assert (value
== 0 || value
== 1);
568 if (warn_implicit_int
== -1)
569 handle_option (OPT_Wimplicit_int
, value
, NULL
,
570 c_family_lang_mask
, kind
);
571 if (warn_implicit_function_declaration
== -1)
572 handle_option (OPT_Wimplicit_function_declaration
, value
, NULL
,
573 c_family_lang_mask
, kind
);
577 /* Silently ignore for now. */
580 case OPT_Winvalid_pch
:
581 cpp_opts
->warn_invalid_pch
= value
;
584 case OPT_Wmissing_include_dirs
:
585 cpp_opts
->warn_missing_include_dirs
= value
;
589 cpp_opts
->warn_multichar
= value
;
592 case OPT_Wnormalized_
:
593 if (!value
|| (arg
&& strcasecmp (arg
, "none") == 0))
594 cpp_opts
->warn_normalize
= normalized_none
;
595 else if (!arg
|| strcasecmp (arg
, "nfkc") == 0)
596 cpp_opts
->warn_normalize
= normalized_KC
;
597 else if (strcasecmp (arg
, "id") == 0)
598 cpp_opts
->warn_normalize
= normalized_identifier_C
;
599 else if (strcasecmp (arg
, "nfc") == 0)
600 cpp_opts
->warn_normalize
= normalized_C
;
602 error ("argument %qs to %<-Wnormalized%> not recognized", arg
);
605 case OPT_Wreturn_type
:
606 warn_return_type
= value
;
609 case OPT_Wtraditional
:
610 cpp_opts
->warn_traditional
= value
;
614 cpp_opts
->warn_trigraphs
= value
;
618 cpp_opts
->warn_undef
= value
;
621 case OPT_Wunknown_pragmas
:
622 /* Set to greater than 1, so that even unknown pragmas in
623 system headers will be warned about. */
624 warn_unknown_pragmas
= value
* 2;
627 case OPT_Wunused_macros
:
628 warn_unused_macros
= value
;
631 case OPT_Wvariadic_macros
:
632 warn_variadic_macros
= value
;
635 case OPT_Wwrite_strings
:
636 warn_write_strings
= value
;
642 warn_nonvdtor
= true;
646 if (!c_dialect_cxx ())
647 set_std_c89 (false, true);
649 set_std_cxx98 (true);
656 case OPT_fcond_mismatch
:
657 if (!c_dialect_cxx ())
659 flag_cond_mismatch
= value
;
664 case OPT_fall_virtual
:
665 case OPT_falt_external_templates
:
666 case OPT_fenum_int_equiv
:
667 case OPT_fexternal_templates
:
668 case OPT_fguiding_decls
:
670 case OPT_fhuge_objects
:
672 case OPT_fname_mangling_version_
:
674 case OPT_fnonnull_objects
:
676 case OPT_fstrict_prototype
:
677 case OPT_fthis_is_variable
:
678 case OPT_fvtable_thunks
:
681 warning (0, "switch %qs is no longer supported", option
->opt_text
);
688 disable_builtin_function (arg
);
691 case OPT_fdirectives_only
:
692 cpp_opts
->directives_only
= value
;
695 case OPT_fdollars_in_identifiers
:
696 cpp_opts
->dollars_in_ident
= value
;
699 case OPT_ffreestanding
:
701 /* Fall through.... */
704 flag_no_builtin
= !value
;
707 case OPT_fconstant_string_class_
:
708 constant_string_class_name
= arg
;
711 case OPT_fdefault_inline
:
715 case OPT_fextended_identifiers
:
716 cpp_opts
->extended_identifiers
= value
;
719 case OPT_fgnu_runtime
:
720 flag_next_runtime
= !value
;
723 case OPT_fhandle_exceptions
:
724 warning (0, "-fhandle-exceptions has been renamed -fexceptions (and is now on by default)");
725 flag_exceptions
= value
;
728 case OPT_fnext_runtime
:
729 flag_next_runtime
= value
;
732 case OPT_foperator_names
:
733 cpp_opts
->operator_names
= value
;
736 case OPT_foptional_diags
:
741 cpp_opts
->restore_pch_deps
= value
;
744 case OPT_fpch_preprocess
:
745 flag_pch_preprocess
= value
;
748 case OPT_fpermissive
:
749 flag_permissive
= value
;
750 global_dc
->permissive
= value
;
753 case OPT_fpreprocessed
:
754 cpp_opts
->preprocessed
= value
;
758 flag_use_repository
= value
;
760 flag_implicit_templates
= 0;
764 /* It is documented that we silently ignore silly values. */
765 if (value
>= 1 && value
<= 100)
766 cpp_opts
->tabstop
= value
;
769 case OPT_fexec_charset_
:
770 cpp_opts
->narrow_charset
= arg
;
773 case OPT_fwide_exec_charset_
:
774 cpp_opts
->wide_charset
= arg
;
777 case OPT_finput_charset_
:
778 cpp_opts
->input_charset
= arg
;
781 case OPT_ftemplate_depth_
:
782 /* Kept for backwards compatibility. */
783 case OPT_ftemplate_depth_eq
:
784 max_tinst_depth
= value
;
787 case OPT_fvisibility_inlines_hidden
:
788 visibility_options
.inlines_hidden
= value
;
791 case OPT_femit_struct_debug_baseonly
:
792 set_struct_debug_option ("base");
795 case OPT_femit_struct_debug_reduced
:
796 set_struct_debug_option ("dir:ord:sys,dir:gen:any,ind:base");
799 case OPT_femit_struct_debug_detailed_
:
800 set_struct_debug_option (arg
);
804 add_path (xstrdup (arg
), AFTER
, 0, true);
809 defer_opt (code
, arg
);
821 add_path (xstrdup (arg
), QUOTE
, 0, true);
829 add_path (xstrdup (arg
), SYSTEM
, 0, true);
832 case OPT_iwithprefix
:
833 add_prefixed_path (arg
, SYSTEM
);
836 case OPT_iwithprefixbefore
:
837 add_prefixed_path (arg
, BRACKET
);
841 cpp_set_lang (parse_in
, CLK_ASM
);
842 cpp_opts
->dollars_in_ident
= false;
857 error ("output filename specified twice");
860 /* We need to handle the -pedantic switches here, rather than in
861 c_common_post_options, so that a subsequent -Wno-endif-labels
862 is not overridden. */
863 case OPT_pedantic_errors
:
865 cpp_opts
->pedantic
= 1;
866 cpp_opts
->warn_endif_labels
= 1;
867 if (warn_pointer_sign
== -1)
868 warn_pointer_sign
= 1;
869 if (warn_overlength_strings
== -1)
870 warn_overlength_strings
= 1;
875 case OPT_print_objc_runtime_info
:
876 print_struct_values
= 1;
879 case OPT_print_pch_checksum
:
880 c_common_print_pch_checksum (stdout
);
881 exit_after_options
= true;
889 case OPT_std_gnu__98
:
890 if (!preprocessing_asm_p
)
891 set_std_cxx98 (code
== OPT_std_c__98
/* ISO */);
895 case OPT_std_gnu__0x
:
896 if (!preprocessing_asm_p
)
897 set_std_cxx0x (code
== OPT_std_c__0x
/* ISO */);
902 case OPT_std_iso9899_1990
:
903 case OPT_std_iso9899_199409
:
904 if (!preprocessing_asm_p
)
905 set_std_c89 (code
== OPT_std_iso9899_199409
/* c94 */, true /* ISO */);
910 if (!preprocessing_asm_p
)
911 set_std_c89 (false /* c94 */, false /* ISO */);
916 case OPT_std_iso9899_1999
:
917 case OPT_std_iso9899_199x
:
918 if (!preprocessing_asm_p
)
919 set_std_c99 (true /* ISO */);
924 if (!preprocessing_asm_p
)
925 set_std_c99 (false /* ISO */);
929 if (!preprocessing_asm_p
)
930 set_std_c1x (true /* ISO */);
934 if (!preprocessing_asm_p
)
935 set_std_c1x (false /* ISO */);
939 cpp_opts
->trigraphs
= 1;
942 case OPT_traditional_cpp
:
943 cpp_opts
->traditional
= 1;
958 /* Post-switch processing. */
960 c_common_post_options (const char **pfilename
)
962 struct cpp_callbacks
*cb
;
964 /* Canonicalize the input and output filenames. */
965 if (in_fnames
== NULL
)
967 in_fnames
= XNEWVEC (const char *, 1);
970 else if (strcmp (in_fnames
[0], "-") == 0)
973 if (out_fname
== NULL
|| !strcmp (out_fname
, "-"))
976 if (cpp_opts
->deps
.style
== DEPS_NONE
)
977 check_deps_environment_vars ();
979 handle_deferred_opts ();
981 sanitize_cpp_opts ();
983 register_include_chains (parse_in
, sysroot
, iprefix
, imultilib
,
984 std_inc
, std_cxx_inc
&& c_dialect_cxx (), verbose
);
986 #ifdef C_COMMON_OVERRIDE_OPTIONS
987 /* Some machines may reject certain combinations of C
988 language-specific options. */
989 C_COMMON_OVERRIDE_OPTIONS
;
992 /* Excess precision other than "fast" requires front-end
994 if (c_dialect_cxx ())
996 if (flag_excess_precision_cmdline
== EXCESS_PRECISION_STANDARD
997 && TARGET_FLT_EVAL_METHOD_NON_DEFAULT
)
998 sorry ("-fexcess-precision=standard for C++");
999 flag_excess_precision_cmdline
= EXCESS_PRECISION_FAST
;
1001 else if (flag_excess_precision_cmdline
== EXCESS_PRECISION_DEFAULT
)
1002 flag_excess_precision_cmdline
= (flag_iso
1003 ? EXCESS_PRECISION_STANDARD
1004 : EXCESS_PRECISION_FAST
);
1006 /* By default we use C99 inline semantics in GNU99 or C99 mode. C99
1007 inline semantics are not supported in GNU89 or C89 mode. */
1008 if (flag_gnu89_inline
== -1)
1009 flag_gnu89_inline
= !flag_isoc99
;
1010 else if (!flag_gnu89_inline
&& !flag_isoc99
)
1011 error ("-fno-gnu89-inline is only supported in GNU99 or C99 mode");
1013 /* Default to ObjC sjlj exception handling if NeXT runtime. */
1014 if (flag_objc_sjlj_exceptions
< 0)
1015 flag_objc_sjlj_exceptions
= flag_next_runtime
;
1016 if (flag_objc_exceptions
&& !flag_objc_sjlj_exceptions
)
1017 flag_exceptions
= 1;
1019 /* -Wextra implies the following flags
1020 unless explicitly overridden. */
1021 if (warn_type_limits
== -1)
1022 warn_type_limits
= extra_warnings
;
1023 if (warn_clobbered
== -1)
1024 warn_clobbered
= extra_warnings
;
1025 if (warn_empty_body
== -1)
1026 warn_empty_body
= extra_warnings
;
1027 if (warn_sign_compare
== -1)
1028 warn_sign_compare
= extra_warnings
;
1029 if (warn_missing_field_initializers
== -1)
1030 warn_missing_field_initializers
= extra_warnings
;
1031 if (warn_missing_parameter_type
== -1)
1032 warn_missing_parameter_type
= extra_warnings
;
1033 if (warn_old_style_declaration
== -1)
1034 warn_old_style_declaration
= extra_warnings
;
1035 if (warn_override_init
== -1)
1036 warn_override_init
= extra_warnings
;
1037 if (warn_ignored_qualifiers
== -1)
1038 warn_ignored_qualifiers
= extra_warnings
;
1040 /* -Wpointer-sign is disabled by default, but it is enabled if any
1041 of -Wall or -pedantic are given. */
1042 if (warn_pointer_sign
== -1)
1043 warn_pointer_sign
= 0;
1045 if (warn_strict_aliasing
== -1)
1046 warn_strict_aliasing
= 0;
1047 if (warn_strict_overflow
== -1)
1048 warn_strict_overflow
= 0;
1049 if (warn_jump_misses_init
== -1)
1050 warn_jump_misses_init
= 0;
1052 /* -Woverlength-strings is off by default, but is enabled by -pedantic.
1053 It is never enabled in C++, as the minimum limit is not normative
1054 in that standard. */
1055 if (warn_overlength_strings
== -1 || c_dialect_cxx ())
1056 warn_overlength_strings
= 0;
1058 /* Wmain is enabled by default in C++ but not in C. */
1059 /* Wmain is disabled by default for -ffreestanding (!flag_hosted),
1060 even if -Wall was given (warn_main will be 2 if set by -Wall, 1
1061 if set by -Wmain). */
1062 if (warn_main
== -1)
1063 warn_main
= (c_dialect_cxx () && flag_hosted
) ? 1 : 0;
1064 else if (warn_main
== 2)
1065 warn_main
= flag_hosted
? 1 : 0;
1067 /* In C, -Wconversion enables -Wsign-conversion (unless disabled
1068 through -Wno-sign-conversion). While in C++,
1069 -Wsign-conversion needs to be requested explicitly. */
1070 if (warn_sign_conversion
== -1)
1071 warn_sign_conversion
= (c_dialect_cxx ()) ? 0 : warn_conversion
;
1073 /* In C, -Wall and -Wc++-compat enable -Wenum-compare, which we do
1074 in c_common_handle_option; if it has not yet been set, it is
1075 disabled by default. In C++, it is enabled by default. */
1076 if (warn_enum_compare
== -1)
1077 warn_enum_compare
= c_dialect_cxx () ? 1 : 0;
1079 /* -Wpacked-bitfield-compat is on by default for the C languages. The
1080 warning is issued in stor-layout.c which is not part of the front-end so
1081 we need to selectively turn it on here. */
1082 if (warn_packed_bitfield_compat
== -1)
1083 warn_packed_bitfield_compat
= 1;
1085 /* Special format checking options don't work without -Wformat; warn if
1089 warning (OPT_Wformat_y2k
,
1090 "-Wformat-y2k ignored without -Wformat");
1091 warning (OPT_Wformat_extra_args
,
1092 "-Wformat-extra-args ignored without -Wformat");
1093 warning (OPT_Wformat_zero_length
,
1094 "-Wformat-zero-length ignored without -Wformat");
1095 warning (OPT_Wformat_nonliteral
,
1096 "-Wformat-nonliteral ignored without -Wformat");
1097 warning (OPT_Wformat_contains_nul
,
1098 "-Wformat-contains-nul ignored without -Wformat");
1099 warning (OPT_Wformat_security
,
1100 "-Wformat-security ignored without -Wformat");
1103 if (warn_implicit
== -1)
1106 if (warn_implicit_int
== -1)
1107 warn_implicit_int
= 0;
1109 /* -Wimplicit-function-declaration is enabled by default for C99. */
1110 if (warn_implicit_function_declaration
== -1)
1111 warn_implicit_function_declaration
= flag_isoc99
;
1113 /* If we're allowing C++0x constructs, don't warn about C++0x
1114 compatibility problems. */
1115 if (cxx_dialect
== cxx0x
)
1116 warn_cxx0x_compat
= 0;
1118 if (flag_preprocess_only
)
1120 /* Open the output now. We must do so even if flag_no_output is
1121 on, because there may be other output than from the actual
1122 preprocessing (e.g. from -dM). */
1123 if (out_fname
[0] == '\0')
1124 out_stream
= stdout
;
1126 out_stream
= fopen (out_fname
, "w");
1128 if (out_stream
== NULL
)
1130 fatal_error ("opening output file %s: %m", out_fname
);
1134 if (num_in_fnames
> 1)
1135 error ("too many filenames given. Type %s --help for usage",
1138 init_pp_output (out_stream
);
1144 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1145 input_location
= UNKNOWN_LOCATION
;
1148 cb
= cpp_get_callbacks (parse_in
);
1149 cb
->file_change
= cb_file_change
;
1150 cb
->dir_change
= cb_dir_change
;
1151 cpp_post_options (parse_in
);
1153 input_location
= UNKNOWN_LOCATION
;
1155 *pfilename
= this_input_filename
1156 = cpp_read_main_file (parse_in
, in_fnames
[0]);
1157 /* Don't do any compilation or preprocessing if there is no input file. */
1158 if (this_input_filename
== NULL
)
1164 if (flag_working_directory
1165 && flag_preprocess_only
&& !flag_no_line_commands
)
1166 pp_dir_change (parse_in
, get_src_pwd ());
1168 return flag_preprocess_only
;
1171 /* Front end initialization common to C, ObjC and C++. */
1173 c_common_init (void)
1175 /* Set up preprocessor arithmetic. Must be done after call to
1176 c_common_nodes_and_builtins for type nodes to be good. */
1177 cpp_opts
->precision
= TYPE_PRECISION (intmax_type_node
);
1178 cpp_opts
->char_precision
= TYPE_PRECISION (char_type_node
);
1179 cpp_opts
->int_precision
= TYPE_PRECISION (integer_type_node
);
1180 cpp_opts
->wchar_precision
= TYPE_PRECISION (wchar_type_node
);
1181 cpp_opts
->unsigned_wchar
= TYPE_UNSIGNED (wchar_type_node
);
1182 cpp_opts
->bytes_big_endian
= BYTES_BIG_ENDIAN
;
1184 /* This can't happen until after wchar_precision and bytes_big_endian
1186 cpp_init_iconv (parse_in
);
1189 c_common_print_pch_checksum (stderr
);
1191 /* Has to wait until now so that cpplib has its hash table. */
1194 if (flag_preprocess_only
)
1197 preprocess_file (parse_in
);
1204 /* Initialize the integrated preprocessor after debug output has been
1205 initialized; loop over each input file. */
1207 c_common_parse_file (int set_yydebug
)
1215 warning(0, "The C parser does not support -dy, option ignored");
1219 "The Objective-C parser does not support -dy, option ignored");
1222 warning(0, "The C++ parser does not support -dy, option ignored");
1226 "The Objective-C++ parser does not support -dy, option ignored");
1241 /* And end the main input file, if the debug writer wants it */
1242 if (debug_hooks
->start_end_main_source_file
)
1243 (*debug_hooks
->end_source_file
) (0);
1244 if (++i
>= num_in_fnames
)
1246 cpp_undef_all (parse_in
);
1247 cpp_clear_file_cache (parse_in
);
1249 = cpp_read_main_file (parse_in
, in_fnames
[i
]);
1250 /* If an input file is missing, abandon further compilation.
1251 cpplib has issued a diagnostic. */
1252 if (!this_input_filename
)
1257 /* Common finish hook for the C, ObjC and C++ front ends. */
1259 c_common_finish (void)
1261 FILE *deps_stream
= NULL
;
1263 /* Don't write the deps file if there are errors. */
1264 if (cpp_opts
->deps
.style
!= DEPS_NONE
&& !seen_error ())
1266 /* If -M or -MM was seen without -MF, default output to the
1269 deps_stream
= out_stream
;
1272 deps_stream
= fopen (deps_file
, deps_append
? "a": "w");
1274 fatal_error ("opening dependency file %s: %m", deps_file
);
1278 /* For performance, avoid tearing down cpplib's internal structures
1279 with cpp_destroy (). */
1280 cpp_finish (parse_in
, deps_stream
);
1282 if (deps_stream
&& deps_stream
!= out_stream
1283 && (ferror (deps_stream
) || fclose (deps_stream
)))
1284 fatal_error ("closing dependency file %s: %m", deps_file
);
1286 if (out_stream
&& (ferror (out_stream
) || fclose (out_stream
)))
1287 fatal_error ("when writing output to %s: %m", out_fname
);
1290 /* Either of two environment variables can specify output of
1291 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1292 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1293 and DEPS_TARGET is the target to mention in the deps. They also
1294 result in dependency information being appended to the output file
1295 rather than overwriting it, and like Sun's compiler
1296 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1298 check_deps_environment_vars (void)
1302 GET_ENVIRONMENT (spec
, "DEPENDENCIES_OUTPUT");
1304 cpp_opts
->deps
.style
= DEPS_USER
;
1307 GET_ENVIRONMENT (spec
, "SUNPRO_DEPENDENCIES");
1310 cpp_opts
->deps
.style
= DEPS_SYSTEM
;
1311 cpp_opts
->deps
.ignore_main_file
= true;
1317 /* Find the space before the DEPS_TARGET, if there is one. */
1318 char *s
= strchr (spec
, ' ');
1321 /* Let the caller perform MAKE quoting. */
1322 defer_opt (OPT_MT
, s
+ 1);
1326 /* Command line -MF overrides environment variables and default. */
1335 /* Handle deferred command line switches. */
1337 handle_deferred_opts (void)
1342 /* Avoid allocating the deps buffer if we don't need it.
1343 (This flag may be true without there having been -MT or -MQ
1344 options, but we'll still need the deps buffer.) */
1348 deps
= cpp_get_deps (parse_in
);
1350 for (i
= 0; i
< deferred_count
; i
++)
1352 struct deferred_opt
*opt
= &deferred_opts
[i
];
1354 if (opt
->code
== OPT_MT
|| opt
->code
== OPT_MQ
)
1355 deps_add_target (deps
, opt
->arg
, opt
->code
== OPT_MQ
);
1359 /* These settings are appropriate for GCC, but not necessarily so for
1360 cpplib as a library. */
1362 sanitize_cpp_opts (void)
1364 /* If we don't know what style of dependencies to output, complain
1365 if any other dependency switches have been given. */
1366 if (deps_seen
&& cpp_opts
->deps
.style
== DEPS_NONE
)
1367 error ("to generate dependencies you must specify either -M or -MM");
1369 /* -dM and dependencies suppress normal output; do it here so that
1370 the last -d[MDN] switch overrides earlier ones. */
1371 if (flag_dump_macros
== 'M')
1374 /* By default, -fdirectives-only implies -dD. This allows subsequent phases
1375 to perform proper macro expansion. */
1376 if (cpp_opts
->directives_only
&& !cpp_opts
->preprocessed
&& !flag_dump_macros
)
1377 flag_dump_macros
= 'D';
1379 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1380 -dM since at least glibc relies on -M -dM to work. */
1381 /* Also, flag_no_output implies flag_no_line_commands, always. */
1384 if (flag_dump_macros
!= 'M')
1385 flag_dump_macros
= 0;
1386 flag_dump_includes
= 0;
1387 flag_no_line_commands
= 1;
1389 else if (cpp_opts
->deps
.missing_files
)
1390 error ("-MG may only be used with -M or -MM");
1392 cpp_opts
->unsigned_char
= !flag_signed_char
;
1393 cpp_opts
->stdc_0_in_system_headers
= STDC_0_IN_SYSTEM_HEADERS
;
1395 /* Wlong-long is disabled by default. It is enabled by:
1396 [-pedantic | -Wtraditional] -std=[gnu|c]++98 ; or
1397 [-pedantic | -Wtraditional] -std=non-c99 .
1399 Either -Wlong-long or -Wno-long-long override any other settings. */
1400 if (warn_long_long
== -1)
1401 warn_long_long
= ((pedantic
|| warn_traditional
)
1402 && (c_dialect_cxx () ? cxx_dialect
== cxx98
: !flag_isoc99
));
1403 cpp_opts
->warn_long_long
= warn_long_long
;
1405 /* Similarly with -Wno-variadic-macros. No check for c99 here, since
1406 this also turns off warnings about GCCs extension. */
1407 cpp_opts
->warn_variadic_macros
1408 = warn_variadic_macros
&& (pedantic
|| warn_traditional
);
1410 /* If we're generating preprocessor output, emit current directory
1411 if explicitly requested or if debugging information is enabled.
1412 ??? Maybe we should only do it for debugging formats that
1413 actually output the current directory? */
1414 if (flag_working_directory
== -1)
1415 flag_working_directory
= (debug_info_level
!= DINFO_LEVEL_NONE
);
1417 if (cpp_opts
->directives_only
)
1419 if (warn_unused_macros
)
1420 error ("-fdirectives-only is incompatible with -Wunused_macros");
1421 if (cpp_opts
->traditional
)
1422 error ("-fdirectives-only is incompatible with -traditional");
1426 /* Add include path with a prefix at the front of its name. */
1428 add_prefixed_path (const char *suffix
, size_t chain
)
1432 size_t prefix_len
, suffix_len
;
1434 suffix_len
= strlen (suffix
);
1435 prefix
= iprefix
? iprefix
: cpp_GCC_INCLUDE_DIR
;
1436 prefix_len
= iprefix
? strlen (iprefix
) : cpp_GCC_INCLUDE_DIR_len
;
1438 path
= (char *) xmalloc (prefix_len
+ suffix_len
+ 1);
1439 memcpy (path
, prefix
, prefix_len
);
1440 memcpy (path
+ prefix_len
, suffix
, suffix_len
);
1441 path
[prefix_len
+ suffix_len
] = '\0';
1443 add_path (path
, chain
, 0, false);
1446 /* Handle -D, -U, -A, -imacros, and the first -include. */
1448 finish_options (void)
1450 if (!cpp_opts
->preprocessed
)
1454 cb_file_change (parse_in
,
1455 linemap_add (line_table
, LC_RENAME
, 0,
1456 _("<built-in>"), 0));
1458 cpp_init_builtins (parse_in
, flag_hosted
);
1459 c_cpp_builtins (parse_in
);
1461 /* We're about to send user input to cpplib, so make it warn for
1462 things that we previously (when we sent it internal definitions)
1463 told it to not warn.
1465 C99 permits implementation-defined characters in identifiers.
1466 The documented meaning of -std= is to turn off extensions that
1467 conflict with the specified standard, and since a strictly
1468 conforming program cannot contain a '$', we do not condition
1469 their acceptance on the -std= setting. */
1470 cpp_opts
->warn_dollars
= (cpp_opts
->pedantic
&& !cpp_opts
->c99
);
1472 cb_file_change (parse_in
,
1473 linemap_add (line_table
, LC_RENAME
, 0,
1474 _("<command-line>"), 0));
1476 for (i
= 0; i
< deferred_count
; i
++)
1478 struct deferred_opt
*opt
= &deferred_opts
[i
];
1480 if (opt
->code
== OPT_D
)
1481 cpp_define (parse_in
, opt
->arg
);
1482 else if (opt
->code
== OPT_U
)
1483 cpp_undef (parse_in
, opt
->arg
);
1484 else if (opt
->code
== OPT_A
)
1486 if (opt
->arg
[0] == '-')
1487 cpp_unassert (parse_in
, opt
->arg
+ 1);
1489 cpp_assert (parse_in
, opt
->arg
);
1493 /* Start the main input file, if the debug writer wants it. */
1494 if (debug_hooks
->start_end_main_source_file
1495 && !flag_preprocess_only
)
1496 (*debug_hooks
->start_source_file
) (0, this_input_filename
);
1498 /* Handle -imacros after -D and -U. */
1499 for (i
= 0; i
< deferred_count
; i
++)
1501 struct deferred_opt
*opt
= &deferred_opts
[i
];
1503 if (opt
->code
== OPT_imacros
1504 && cpp_push_include (parse_in
, opt
->arg
))
1506 /* Disable push_command_line_include callback for now. */
1507 include_cursor
= deferred_count
+ 1;
1508 cpp_scan_nooutput (parse_in
);
1514 if (cpp_opts
->directives_only
)
1515 cpp_init_special_builtins (parse_in
);
1517 /* Start the main input file, if the debug writer wants it. */
1518 if (debug_hooks
->start_end_main_source_file
1519 && !flag_preprocess_only
)
1520 (*debug_hooks
->start_source_file
) (0, this_input_filename
);
1524 push_command_line_include ();
1527 /* Give CPP the next file given by -include, if any. */
1529 push_command_line_include (void)
1531 while (include_cursor
< deferred_count
)
1533 struct deferred_opt
*opt
= &deferred_opts
[include_cursor
++];
1535 if (!cpp_opts
->preprocessed
&& opt
->code
== OPT_include
1536 && cpp_push_include (parse_in
, opt
->arg
))
1540 if (include_cursor
== deferred_count
)
1543 /* -Wunused-macros should only warn about macros defined hereafter. */
1544 cpp_opts
->warn_unused_macros
= warn_unused_macros
;
1545 /* Restore the line map from <command line>. */
1546 if (!cpp_opts
->preprocessed
)
1547 cpp_change_file (parse_in
, LC_RENAME
, this_input_filename
);
1549 /* Set this here so the client can change the option if it wishes,
1550 and after stacking the main file so we don't trace the main file. */
1551 line_table
->trace_includes
= cpp_opts
->print_include_names
;
1555 /* File change callback. Has to handle -include files. */
1557 cb_file_change (cpp_reader
* ARG_UNUSED (pfile
),
1558 const struct line_map
*new_map
)
1560 if (flag_preprocess_only
)
1561 pp_file_change (new_map
);
1563 fe_file_change (new_map
);
1565 if (new_map
== 0 || (new_map
->reason
== LC_LEAVE
&& MAIN_FILE_P (new_map
)))
1566 push_command_line_include ();
1570 cb_dir_change (cpp_reader
* ARG_UNUSED (pfile
), const char *dir
)
1572 if (!set_src_pwd (dir
))
1573 warning (0, "too late for # directive to set debug directory");
1576 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1577 extensions if ISO). There is no concept of gnu94. */
1579 set_std_c89 (int c94
, int iso
)
1581 cpp_set_lang (parse_in
, c94
? CLK_STDC94
: iso
? CLK_STDC89
: CLK_GNUC89
);
1584 flag_no_gnu_keywords
= iso
;
1585 flag_no_nonansi_builtin
= iso
;
1591 /* Set the C 99 standard (without GNU extensions if ISO). */
1593 set_std_c99 (int iso
)
1595 cpp_set_lang (parse_in
, iso
? CLK_STDC99
: CLK_GNUC99
);
1597 flag_no_nonansi_builtin
= iso
;
1604 /* Set the C 1X standard draft (without GNU extensions if ISO). */
1606 set_std_c1x (int iso
)
1608 cpp_set_lang (parse_in
, iso
? CLK_STDC1X
: CLK_GNUC1X
);
1610 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 /* Args to -d specify what to dump. Silently ignore
1640 unrecognized options; they may be aimed at toplev.c. */
1642 handle_OPT_d (const char *arg
)
1646 while ((c
= *arg
++) != '\0')
1649 case 'M': /* Dump macros only. */
1650 case 'N': /* Dump names. */
1651 case 'D': /* Dump definitions. */
1652 case 'U': /* Dump used macros. */
1653 flag_dump_macros
= c
;
1657 flag_dump_includes
= 1;