1 /* C/ObjC/C++ command line option handling.
2 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
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. */
40 #include "tm.h" /* For BYTES_BIG_ENDIAN,
41 DOLLARS_IN_IDENTIFIERS,
42 STDC_0_IN_SYSTEM_HEADERS,
43 TARGET_FLT_EVAL_METHOD_NON_DEFAULT and
45 #include "tm_p.h" /* For C_COMMON_OVERRIDE_OPTIONS. */
47 #ifndef DOLLARS_IN_IDENTIFIERS
48 # define DOLLARS_IN_IDENTIFIERS true
51 #ifndef TARGET_SYSTEM_ROOT
52 # define TARGET_SYSTEM_ROOT NULL
56 #define TARGET_OPTF(ARG)
60 cpp_options
*cpp_opts
;
63 static const char *this_input_filename
;
65 /* Filename and stream for preprocessed output. */
66 static const char *out_fname
;
67 static FILE *out_stream
;
69 /* Append dependencies to deps_file. */
70 static bool deps_append
;
72 /* If dependency switches (-MF etc.) have been given. */
73 static bool deps_seen
;
78 /* Dependency output file. */
79 static const char *deps_file
;
81 /* The prefix given by -iprefix, if any. */
82 static const char *iprefix
;
84 /* The multilib directory given by -imultilib, if any. */
85 static const char *imultilib
;
87 /* The system root, if any. Overridden by -isysroot. */
88 static const char *sysroot
= TARGET_SYSTEM_ROOT
;
90 /* Zero disables all standard directories for headers. */
91 static bool std_inc
= true;
93 /* Zero disables the C++-specific standard directories for headers. */
94 static bool std_cxx_inc
= true;
96 /* If the quote chain has been split by -I-. */
97 static bool quote_chain_split
;
99 /* If -Wunused-macros. */
100 static bool warn_unused_macros
;
102 /* If -Wvariadic-macros. */
103 static bool warn_variadic_macros
= true;
105 /* Number of deferred options. */
106 static size_t deferred_count
;
108 /* Number of deferred options scanned for -include. */
109 static size_t include_cursor
;
111 static void handle_OPT_d (const char *);
112 static void set_std_cxx98 (int);
113 static void set_std_cxx11 (int);
114 static void set_std_cxx1y (int);
115 static void set_std_c89 (int, int);
116 static void set_std_c99 (int);
117 static void set_std_c11 (int);
118 static void check_deps_environment_vars (void);
119 static void handle_deferred_opts (void);
120 static void sanitize_cpp_opts (void);
121 static void add_prefixed_path (const char *, size_t);
122 static void push_command_line_include (void);
123 static void cb_file_change (cpp_reader
*, const struct line_map
*);
124 static void cb_dir_change (cpp_reader
*, const char *);
125 static void c_finish_options (void);
127 #ifndef STDC_0_IN_SYSTEM_HEADERS
128 #define STDC_0_IN_SYSTEM_HEADERS 0
131 /* Holds switches parsed by c_common_handle_option (), but whose
132 handling is deferred to c_common_post_options (). */
133 static void defer_opt (enum opt_code
, const char *);
134 static struct deferred_opt
141 extern const unsigned int
142 c_family_lang_mask
= (CL_C
| CL_CXX
| CL_ObjC
| CL_ObjCXX
);
144 /* Defer option CODE with argument ARG. */
146 defer_opt (enum opt_code code
, const char *arg
)
148 deferred_opts
[deferred_count
].code
= code
;
149 deferred_opts
[deferred_count
].arg
= arg
;
153 /* Return language mask for option parsing. */
155 c_common_option_lang_mask (void)
157 static const unsigned int lang_flags
[] = {CL_C
, CL_ObjC
, CL_CXX
, CL_ObjCXX
};
159 return lang_flags
[c_language
];
162 /* Common diagnostics initialization. */
164 c_common_initialize_diagnostics (diagnostic_context
*context
)
166 /* This is conditionalized only because that is the way the front
167 ends used to do it. Maybe this should be unconditional? */
168 if (c_dialect_cxx ())
170 /* By default wrap lines at 80 characters. Is getenv
171 ("COLUMNS") preferable? */
172 diagnostic_line_cutoff (context
) = 80;
173 /* By default, emit location information once for every
174 diagnostic message. */
175 diagnostic_prefixing_rule (context
) = DIAGNOSTICS_SHOW_PREFIX_ONCE
;
178 context
->opt_permissive
= OPT_fpermissive
;
181 /* Whether options from all C-family languages should be accepted
183 static bool accept_all_c_family_options
= false;
185 /* Return whether to complain about a wrong-language option. */
187 c_common_complain_wrong_lang_p (const struct cl_option
*option
)
189 if (accept_all_c_family_options
190 && (option
->flags
& c_family_lang_mask
))
196 /* Initialize options structure OPTS. */
198 c_common_init_options_struct (struct gcc_options
*opts
)
200 opts
->x_flag_exceptions
= c_dialect_cxx ();
201 opts
->x_warn_pointer_arith
= c_dialect_cxx ();
202 opts
->x_warn_write_strings
= c_dialect_cxx ();
203 opts
->x_flag_warn_unused_result
= true;
205 /* By default, C99-like requirements for complex multiply and divide. */
206 opts
->x_flag_complex_method
= 2;
209 /* Common initialization before calling option handlers. */
211 c_common_init_options (unsigned int decoded_options_count
,
212 struct cl_decoded_option
*decoded_options
)
215 struct cpp_callbacks
*cb
;
217 parse_in
= cpp_create_reader (c_dialect_cxx () ? CLK_GNUCXX
: CLK_GNUC89
,
218 ident_hash
, line_table
);
219 cb
= cpp_get_callbacks (parse_in
);
220 cb
->error
= c_cpp_error
;
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 deferred_opts
= XNEWVEC (struct deferred_opt
, decoded_options_count
);
232 if (c_language
== clk_c
)
234 /* If preprocessing assembly language, accept any of the C-family
235 front end options since the driver may pass them through. */
236 for (i
= 1; i
< decoded_options_count
; i
++)
237 if (decoded_options
[i
].opt_index
== OPT_lang_asm
)
239 accept_all_c_family_options
= true;
245 /* Handle switch SCODE with argument ARG. VALUE is true, unless no-
246 form of an -f or -W option was given. Returns false if the switch was
247 invalid, true if valid. Use HANDLERS in recursive handle_option calls. */
249 c_common_handle_option (size_t scode
, const char *arg
, int value
,
250 int kind
, location_t loc
,
251 const struct cl_option_handlers
*handlers
)
253 const struct cl_option
*option
= &cl_options
[scode
];
254 enum opt_code code
= (enum opt_code
) scode
;
257 /* Prevent resetting the language standard to a C dialect when the driver
258 has already determined that we're looking at assembler input. */
259 bool preprocessing_asm_p
= (cpp_get_options (parse_in
)->lang
== CLK_ASM
);
264 if (cl_options
[code
].flags
& c_family_lang_mask
)
266 if ((option
->flags
& CL_TARGET
)
267 && ! targetcm
.handle_c_option (scode
, arg
, value
))
274 case OPT__output_pch_
:
279 defer_opt (code
, arg
);
283 cpp_opts
->discard_comments
= 0;
287 cpp_opts
->discard_comments
= 0;
288 cpp_opts
->discard_comments_in_macro_exp
= 0;
292 defer_opt (code
, arg
);
296 cpp_opts
->print_include_names
= 1;
300 TARGET_OPTF (xstrdup (arg
));
304 if (strcmp (arg
, "-"))
305 add_path (xstrdup (arg
), BRACKET
, 0, true);
308 if (quote_chain_split
)
309 error ("-I- specified twice");
310 quote_chain_split
= true;
311 split_quote_chain ();
312 inform (input_location
, "obsolete option -I- used, please use -iquote instead");
318 /* When doing dependencies with -M or -MM, suppress normal
319 preprocessed output, but still do -dM etc. as software
320 depends on this. Preprocessed output does occur if -MD, -MMD
321 or environment var dependency generation is used. */
322 cpp_opts
->deps
.style
= (code
== OPT_M
? DEPS_SYSTEM
: DEPS_USER
);
328 cpp_opts
->deps
.style
= (code
== OPT_MD
? DEPS_SYSTEM
: DEPS_USER
);
329 cpp_opts
->deps
.need_preprocessor_output
= true;
340 cpp_opts
->deps
.missing_files
= true;
345 cpp_opts
->deps
.phony_targets
= true;
351 defer_opt (code
, arg
);
355 flag_no_line_commands
= 1;
359 defer_opt (code
, arg
);
365 handle_generated_option (&global_options
, &global_options_set
,
366 OPT_Wimplicit
, NULL
, value
,
367 c_family_lang_mask
, kind
, loc
,
368 handlers
, global_dc
);
369 warn_char_subscripts
= value
;
370 warn_missing_braces
= value
;
371 warn_parentheses
= value
;
372 warn_return_type
= value
;
373 warn_sequence_point
= value
; /* Was C only. */
375 if (warn_strict_aliasing
== -1)
376 set_Wstrict_aliasing (&global_options
, value
);
377 warn_address
= value
;
378 if (warn_strict_overflow
== -1)
379 warn_strict_overflow
= value
;
380 warn_array_bounds
= value
;
381 warn_volatile_register_var
= value
;
383 /* Only warn about unknown pragmas that are not in system
385 warn_unknown_pragmas
= value
;
387 warn_uninitialized
= value
;
388 warn_maybe_uninitialized
= value
;
390 if (!c_dialect_cxx ())
392 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding
393 can turn it off only if it's not explicit. */
395 warn_main
= (value
? 2 : 0);
397 /* In C, -Wall turns on -Wenum-compare, which we do here.
398 In C++ it is on by default, which is done in
399 c_common_post_options. */
400 if (warn_enum_compare
== -1)
401 warn_enum_compare
= value
;
405 /* C++-specific warnings. */
406 warn_sign_compare
= value
;
407 warn_reorder
= value
;
408 warn_cxx0x_compat
= value
;
409 warn_delnonvdtor
= value
;
410 warn_narrowing
= value
;
413 cpp_opts
->warn_trigraphs
= value
;
414 cpp_opts
->warn_comments
= value
;
415 cpp_opts
->warn_num_sign_change
= value
;
417 if (warn_pointer_sign
== -1)
418 warn_pointer_sign
= value
;
421 case OPT_Wbuiltin_macro_redefined
:
422 cpp_opts
->warn_builtin_macro_redefined
= value
;
426 cpp_opts
->warn_comments
= value
;
429 case OPT_Wc___compat
:
430 /* Because -Wenum-compare is the default in C++, -Wc++-compat
431 implies -Wenum-compare. */
432 if (warn_enum_compare
== -1 && value
)
433 warn_enum_compare
= value
;
434 /* Because C++ always warns about a goto which misses an
435 initialization, -Wc++-compat turns on -Wjump-misses-init. */
436 if (warn_jump_misses_init
== -1 && value
)
437 warn_jump_misses_init
= value
;
438 cpp_opts
->warn_cxx_operator_names
= value
;
441 case OPT_Wc__0x_compat
:
442 warn_narrowing
= value
;
445 case OPT_Wdeprecated
:
446 cpp_opts
->cpp_warn_deprecated
= value
;
449 case OPT_Wendif_labels
:
450 cpp_opts
->warn_endif_labels
= value
;
458 set_Wformat (atoi (arg
));
462 gcc_assert (value
== 0 || value
== 1);
463 if (warn_implicit_int
== -1)
464 handle_generated_option (&global_options
, &global_options_set
,
465 OPT_Wimplicit_int
, NULL
, value
,
466 c_family_lang_mask
, kind
, loc
, handlers
,
468 if (warn_implicit_function_declaration
== -1)
469 handle_generated_option (&global_options
, &global_options_set
,
470 OPT_Wimplicit_function_declaration
, NULL
,
471 value
, c_family_lang_mask
, kind
, loc
,
472 handlers
, global_dc
);
475 case OPT_Winvalid_pch
:
476 cpp_opts
->warn_invalid_pch
= value
;
480 cpp_opts
->cpp_warn_long_long
= value
;
483 case OPT_Wmissing_include_dirs
:
484 cpp_opts
->warn_missing_include_dirs
= value
;
488 cpp_opts
->warn_multichar
= value
;
491 case OPT_Wnormalized_
:
492 if (kind
== DK_ERROR
)
495 inform (input_location
, "-Werror=normalized=: set -Wnormalized=nfc");
496 cpp_opts
->warn_normalize
= normalized_C
;
500 if (!value
|| (arg
&& strcasecmp (arg
, "none") == 0))
501 cpp_opts
->warn_normalize
= normalized_none
;
502 else if (!arg
|| strcasecmp (arg
, "nfkc") == 0)
503 cpp_opts
->warn_normalize
= normalized_KC
;
504 else if (strcasecmp (arg
, "id") == 0)
505 cpp_opts
->warn_normalize
= normalized_identifier_C
;
506 else if (strcasecmp (arg
, "nfc") == 0)
507 cpp_opts
->warn_normalize
= normalized_C
;
509 error ("argument %qs to %<-Wnormalized%> not recognized", arg
);
513 case OPT_Wreturn_type
:
514 warn_return_type
= value
;
517 case OPT_Wtraditional
:
518 cpp_opts
->cpp_warn_traditional
= value
;
522 cpp_opts
->warn_trigraphs
= value
;
526 cpp_opts
->warn_undef
= value
;
529 case OPT_Wunknown_pragmas
:
530 /* Set to greater than 1, so that even unknown pragmas in
531 system headers will be warned about. */
532 warn_unknown_pragmas
= value
* 2;
535 case OPT_Wunused_macros
:
536 warn_unused_macros
= value
;
539 case OPT_Wvariadic_macros
:
540 warn_variadic_macros
= value
;
543 case OPT_Wwrite_strings
:
544 warn_write_strings
= value
;
550 warn_nonvdtor
= true;
554 if (!c_dialect_cxx ())
555 set_std_c89 (false, true);
557 set_std_cxx98 (true);
564 case OPT_fcond_mismatch
:
565 if (!c_dialect_cxx ())
567 flag_cond_mismatch
= value
;
570 warning (0, "switch %qs is no longer supported", option
->opt_text
);
577 disable_builtin_function (arg
);
580 case OPT_fdirectives_only
:
581 cpp_opts
->directives_only
= value
;
584 case OPT_fdollars_in_identifiers
:
585 cpp_opts
->dollars_in_ident
= value
;
588 case OPT_ffreestanding
:
590 /* Fall through.... */
593 flag_no_builtin
= !value
;
596 case OPT_fconstant_string_class_
:
597 constant_string_class_name
= arg
;
600 case OPT_fextended_identifiers
:
601 cpp_opts
->extended_identifiers
= value
;
604 case OPT_foperator_names
:
605 cpp_opts
->operator_names
= value
;
609 cpp_opts
->restore_pch_deps
= value
;
612 case OPT_fpch_preprocess
:
613 flag_pch_preprocess
= value
;
616 case OPT_fpermissive
:
617 flag_permissive
= value
;
618 global_dc
->permissive
= value
;
621 case OPT_fpreprocessed
:
622 cpp_opts
->preprocessed
= value
;
629 case OPT_ftrack_macro_expansion
:
634 case OPT_ftrack_macro_expansion_
:
635 if (arg
&& *arg
!= '\0')
636 cpp_opts
->track_macro_expansion
= value
;
638 cpp_opts
->track_macro_expansion
= 2;
642 flag_use_repository
= value
;
644 flag_implicit_templates
= 0;
648 /* It is documented that we silently ignore silly values. */
649 if (value
>= 1 && value
<= 100)
650 cpp_opts
->tabstop
= value
;
653 case OPT_fexec_charset_
:
654 cpp_opts
->narrow_charset
= arg
;
657 case OPT_fwide_exec_charset_
:
658 cpp_opts
->wide_charset
= arg
;
661 case OPT_finput_charset_
:
662 cpp_opts
->input_charset
= arg
;
665 case OPT_ftemplate_depth_
:
666 max_tinst_depth
= value
;
669 case OPT_fvisibility_inlines_hidden
:
670 visibility_options
.inlines_hidden
= value
;
673 case OPT_femit_struct_debug_baseonly
:
674 set_struct_debug_option (&global_options
, loc
, "base");
677 case OPT_femit_struct_debug_reduced
:
678 set_struct_debug_option (&global_options
, loc
,
679 "dir:ord:sys,dir:gen:any,ind:base");
682 case OPT_femit_struct_debug_detailed_
:
683 set_struct_debug_option (&global_options
, loc
, arg
);
687 add_path (xstrdup (arg
), AFTER
, 0, true);
692 defer_opt (code
, arg
);
704 add_path (xstrdup (arg
), QUOTE
, 0, true);
712 add_path (xstrdup (arg
), SYSTEM
, 0, true);
715 case OPT_iwithprefix
:
716 add_prefixed_path (arg
, SYSTEM
);
719 case OPT_iwithprefixbefore
:
720 add_prefixed_path (arg
, BRACKET
);
724 cpp_set_lang (parse_in
, CLK_ASM
);
725 cpp_opts
->dollars_in_ident
= false;
740 error ("output filename specified twice");
743 /* We need to handle the -Wpedantic switches here, rather than in
744 c_common_post_options, so that a subsequent -Wno-endif-labels
745 is not overridden. */
746 case OPT_pedantic_errors
:
748 cpp_opts
->cpp_pedantic
= 1;
749 cpp_opts
->warn_endif_labels
= 1;
750 if (warn_pointer_sign
== -1)
751 warn_pointer_sign
= 1;
752 if (warn_overlength_strings
== -1)
753 warn_overlength_strings
= 1;
758 case OPT_print_objc_runtime_info
:
759 print_struct_values
= 1;
767 case OPT_std_gnu__98
:
768 if (!preprocessing_asm_p
)
769 set_std_cxx98 (code
== OPT_std_c__98
/* ISO */);
773 case OPT_std_gnu__11
:
774 if (!preprocessing_asm_p
)
775 set_std_cxx11 (code
== OPT_std_c__11
/* ISO */);
779 case OPT_std_gnu__1y
:
780 if (!preprocessing_asm_p
)
781 set_std_cxx1y (code
== OPT_std_c__11
/* ISO */);
785 case OPT_std_iso9899_199409
:
786 if (!preprocessing_asm_p
)
787 set_std_c89 (code
== OPT_std_iso9899_199409
/* c94 */, true /* ISO */);
791 if (!preprocessing_asm_p
)
792 set_std_c89 (false /* c94 */, false /* ISO */);
796 if (!preprocessing_asm_p
)
797 set_std_c99 (true /* ISO */);
801 if (!preprocessing_asm_p
)
802 set_std_c99 (false /* ISO */);
806 if (!preprocessing_asm_p
)
807 set_std_c11 (true /* ISO */);
811 if (!preprocessing_asm_p
)
812 set_std_c11 (false /* ISO */);
816 cpp_opts
->trigraphs
= 1;
819 case OPT_traditional_cpp
:
820 cpp_opts
->traditional
= 1;
835 /* Default implementation of TARGET_HANDLE_C_OPTION. */
838 default_handle_c_option (size_t code ATTRIBUTE_UNUSED
,
839 const char *arg ATTRIBUTE_UNUSED
,
840 int value ATTRIBUTE_UNUSED
)
845 /* Post-switch processing. */
847 c_common_post_options (const char **pfilename
)
849 struct cpp_callbacks
*cb
;
851 /* Canonicalize the input and output filenames. */
852 if (in_fnames
== NULL
)
854 in_fnames
= XNEWVEC (const char *, 1);
857 else if (strcmp (in_fnames
[0], "-") == 0)
860 if (out_fname
== NULL
|| !strcmp (out_fname
, "-"))
863 if (cpp_opts
->deps
.style
== DEPS_NONE
)
864 check_deps_environment_vars ();
866 handle_deferred_opts ();
868 sanitize_cpp_opts ();
870 register_include_chains (parse_in
, sysroot
, iprefix
, imultilib
,
871 std_inc
, std_cxx_inc
&& c_dialect_cxx (), verbose
);
873 #ifdef C_COMMON_OVERRIDE_OPTIONS
874 /* Some machines may reject certain combinations of C
875 language-specific options. */
876 C_COMMON_OVERRIDE_OPTIONS
;
879 /* Excess precision other than "fast" requires front-end
881 if (c_dialect_cxx ())
883 if (flag_excess_precision_cmdline
== EXCESS_PRECISION_STANDARD
884 && TARGET_FLT_EVAL_METHOD_NON_DEFAULT
)
885 sorry ("-fexcess-precision=standard for C++");
886 flag_excess_precision_cmdline
= EXCESS_PRECISION_FAST
;
888 else if (flag_excess_precision_cmdline
== EXCESS_PRECISION_DEFAULT
)
889 flag_excess_precision_cmdline
= (flag_iso
890 ? EXCESS_PRECISION_STANDARD
891 : EXCESS_PRECISION_FAST
);
893 /* By default we use C99 inline semantics in GNU99 or C99 mode. C99
894 inline semantics are not supported in GNU89 or C89 mode. */
895 if (flag_gnu89_inline
== -1)
896 flag_gnu89_inline
= !flag_isoc99
;
897 else if (!flag_gnu89_inline
&& !flag_isoc99
)
898 error ("-fno-gnu89-inline is only supported in GNU99 or C99 mode");
900 /* Default to ObjC sjlj exception handling if NeXT runtime. */
901 if (flag_objc_sjlj_exceptions
< 0)
902 flag_objc_sjlj_exceptions
= flag_next_runtime
;
903 if (flag_objc_exceptions
&& !flag_objc_sjlj_exceptions
)
906 /* -Wextra implies the following flags
907 unless explicitly overridden. */
908 if (warn_type_limits
== -1)
909 warn_type_limits
= extra_warnings
;
910 if (warn_clobbered
== -1)
911 warn_clobbered
= extra_warnings
;
912 if (warn_empty_body
== -1)
913 warn_empty_body
= extra_warnings
;
914 if (warn_sign_compare
== -1)
915 warn_sign_compare
= extra_warnings
;
916 if (warn_missing_field_initializers
== -1)
917 warn_missing_field_initializers
= extra_warnings
;
918 if (warn_missing_parameter_type
== -1)
919 warn_missing_parameter_type
= extra_warnings
;
920 if (warn_old_style_declaration
== -1)
921 warn_old_style_declaration
= extra_warnings
;
922 if (warn_override_init
== -1)
923 warn_override_init
= extra_warnings
;
924 if (warn_ignored_qualifiers
== -1)
925 warn_ignored_qualifiers
= extra_warnings
;
927 /* -Wpointer-sign is disabled by default, but it is enabled if any
928 of -Wall or -Wpedantic are given. */
929 if (warn_pointer_sign
== -1)
930 warn_pointer_sign
= 0;
932 if (warn_strict_aliasing
== -1)
933 warn_strict_aliasing
= 0;
934 if (warn_strict_overflow
== -1)
935 warn_strict_overflow
= 0;
936 if (warn_jump_misses_init
== -1)
937 warn_jump_misses_init
= 0;
939 /* -Woverlength-strings is off by default, but is enabled by -Wpedantic.
940 It is never enabled in C++, as the minimum limit is not normative
942 if (warn_overlength_strings
== -1 || c_dialect_cxx ())
943 warn_overlength_strings
= 0;
945 /* Wmain is enabled by default in C++ but not in C. */
946 /* Wmain is disabled by default for -ffreestanding (!flag_hosted),
947 even if -Wall was given (warn_main will be 2 if set by -Wall, 1
948 if set by -Wmain). */
950 warn_main
= (c_dialect_cxx () && flag_hosted
) ? 1 : 0;
951 else if (warn_main
== 2)
952 warn_main
= flag_hosted
? 1 : 0;
954 /* In C, -Wconversion enables -Wsign-conversion (unless disabled
955 through -Wno-sign-conversion). While in C++,
956 -Wsign-conversion needs to be requested explicitly. */
957 if (warn_sign_conversion
== -1)
958 warn_sign_conversion
= (c_dialect_cxx ()) ? 0 : warn_conversion
;
960 /* In C, -Wall and -Wc++-compat enable -Wenum-compare, which we do
961 in c_common_handle_option; if it has not yet been set, it is
962 disabled by default. In C++, it is enabled by default. */
963 if (warn_enum_compare
== -1)
964 warn_enum_compare
= c_dialect_cxx () ? 1 : 0;
966 /* -Wpacked-bitfield-compat is on by default for the C languages. The
967 warning is issued in stor-layout.c which is not part of the front-end so
968 we need to selectively turn it on here. */
969 if (warn_packed_bitfield_compat
== -1)
970 warn_packed_bitfield_compat
= 1;
972 /* Special format checking options don't work without -Wformat; warn if
976 warning (OPT_Wformat_y2k
,
977 "-Wformat-y2k ignored without -Wformat");
978 warning (OPT_Wformat_extra_args
,
979 "-Wformat-extra-args ignored without -Wformat");
980 warning (OPT_Wformat_zero_length
,
981 "-Wformat-zero-length ignored without -Wformat");
982 warning (OPT_Wformat_nonliteral
,
983 "-Wformat-nonliteral ignored without -Wformat");
984 warning (OPT_Wformat_contains_nul
,
985 "-Wformat-contains-nul ignored without -Wformat");
986 warning (OPT_Wformat_security
,
987 "-Wformat-security ignored without -Wformat");
990 if (warn_implicit
== -1)
993 if (warn_implicit_int
== -1)
994 warn_implicit_int
= 0;
996 /* -Wimplicit-function-declaration is enabled by default for C99. */
997 if (warn_implicit_function_declaration
== -1)
998 warn_implicit_function_declaration
= flag_isoc99
;
1000 if (cxx_dialect
>= cxx0x
)
1002 /* If we're allowing C++0x constructs, don't warn about C++98
1003 identifiers which are keywords in C++0x. */
1004 warn_cxx0x_compat
= 0;
1006 if (warn_narrowing
== -1)
1009 else if (warn_narrowing
== -1)
1012 if (flag_preprocess_only
)
1014 /* Open the output now. We must do so even if flag_no_output is
1015 on, because there may be other output than from the actual
1016 preprocessing (e.g. from -dM). */
1017 if (out_fname
[0] == '\0')
1018 out_stream
= stdout
;
1020 out_stream
= fopen (out_fname
, "w");
1022 if (out_stream
== NULL
)
1024 fatal_error ("opening output file %s: %m", out_fname
);
1028 if (num_in_fnames
> 1)
1029 error ("too many filenames given. Type %s --help for usage",
1032 init_pp_output (out_stream
);
1038 /* When writing a PCH file, avoid reading some other PCH file,
1039 because the default address space slot then can't be used
1040 for the output PCH file. */
1042 c_common_no_more_pch ();
1044 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1045 input_location
= UNKNOWN_LOCATION
;
1048 cb
= cpp_get_callbacks (parse_in
);
1049 cb
->file_change
= cb_file_change
;
1050 cb
->dir_change
= cb_dir_change
;
1051 cpp_post_options (parse_in
);
1053 input_location
= UNKNOWN_LOCATION
;
1055 *pfilename
= this_input_filename
1056 = cpp_read_main_file (parse_in
, in_fnames
[0]);
1057 /* Don't do any compilation or preprocessing if there is no input file. */
1058 if (this_input_filename
== NULL
)
1064 if (flag_working_directory
1065 && flag_preprocess_only
&& !flag_no_line_commands
)
1066 pp_dir_change (parse_in
, get_src_pwd ());
1068 /* Disable LTO output when outputting a precompiled header. */
1069 if (pch_file
&& flag_lto
)
1072 flag_generate_lto
= 0;
1075 return flag_preprocess_only
;
1078 /* Front end initialization common to C, ObjC and C++. */
1080 c_common_init (void)
1082 /* Set up preprocessor arithmetic. Must be done after call to
1083 c_common_nodes_and_builtins for type nodes to be good. */
1084 cpp_opts
->precision
= TYPE_PRECISION (intmax_type_node
);
1085 cpp_opts
->char_precision
= TYPE_PRECISION (char_type_node
);
1086 cpp_opts
->int_precision
= TYPE_PRECISION (integer_type_node
);
1087 cpp_opts
->wchar_precision
= TYPE_PRECISION (wchar_type_node
);
1088 cpp_opts
->unsigned_wchar
= TYPE_UNSIGNED (wchar_type_node
);
1089 cpp_opts
->bytes_big_endian
= BYTES_BIG_ENDIAN
;
1091 /* This can't happen until after wchar_precision and bytes_big_endian
1093 cpp_init_iconv (parse_in
);
1096 c_common_print_pch_checksum (stderr
);
1098 /* Has to wait until now so that cpplib has its hash table. */
1101 if (flag_preprocess_only
)
1103 c_finish_options ();
1104 preprocess_file (parse_in
);
1111 /* Initialize the integrated preprocessor after debug output has been
1112 initialized; loop over each input file. */
1114 c_common_parse_file (void)
1121 c_finish_options ();
1126 /* And end the main input file, if the debug writer wants it */
1127 if (debug_hooks
->start_end_main_source_file
)
1128 (*debug_hooks
->end_source_file
) (0);
1129 if (++i
>= num_in_fnames
)
1131 cpp_undef_all (parse_in
);
1132 cpp_clear_file_cache (parse_in
);
1134 = cpp_read_main_file (parse_in
, in_fnames
[i
]);
1135 /* If an input file is missing, abandon further compilation.
1136 cpplib has issued a diagnostic. */
1137 if (!this_input_filename
)
1142 /* Common finish hook for the C, ObjC and C++ front ends. */
1144 c_common_finish (void)
1146 FILE *deps_stream
= NULL
;
1148 /* Don't write the deps file if there are errors. */
1149 if (cpp_opts
->deps
.style
!= DEPS_NONE
&& !seen_error ())
1151 /* If -M or -MM was seen without -MF, default output to the
1154 deps_stream
= out_stream
;
1157 deps_stream
= fopen (deps_file
, deps_append
? "a": "w");
1159 fatal_error ("opening dependency file %s: %m", deps_file
);
1163 /* For performance, avoid tearing down cpplib's internal structures
1164 with cpp_destroy (). */
1165 cpp_finish (parse_in
, deps_stream
);
1167 if (deps_stream
&& deps_stream
!= out_stream
1168 && (ferror (deps_stream
) || fclose (deps_stream
)))
1169 fatal_error ("closing dependency file %s: %m", deps_file
);
1171 if (out_stream
&& (ferror (out_stream
) || fclose (out_stream
)))
1172 fatal_error ("when writing output to %s: %m", out_fname
);
1175 /* Either of two environment variables can specify output of
1176 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1177 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1178 and DEPS_TARGET is the target to mention in the deps. They also
1179 result in dependency information being appended to the output file
1180 rather than overwriting it, and like Sun's compiler
1181 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1183 check_deps_environment_vars (void)
1187 spec
= getenv ("DEPENDENCIES_OUTPUT");
1189 cpp_opts
->deps
.style
= DEPS_USER
;
1192 spec
= getenv ("SUNPRO_DEPENDENCIES");
1195 cpp_opts
->deps
.style
= DEPS_SYSTEM
;
1196 cpp_opts
->deps
.ignore_main_file
= true;
1202 /* Find the space before the DEPS_TARGET, if there is one. */
1203 char *s
= strchr (spec
, ' ');
1206 /* Let the caller perform MAKE quoting. */
1207 defer_opt (OPT_MT
, s
+ 1);
1211 /* Command line -MF overrides environment variables and default. */
1220 /* Handle deferred command line switches. */
1222 handle_deferred_opts (void)
1227 /* Avoid allocating the deps buffer if we don't need it.
1228 (This flag may be true without there having been -MT or -MQ
1229 options, but we'll still need the deps buffer.) */
1233 deps
= cpp_get_deps (parse_in
);
1235 for (i
= 0; i
< deferred_count
; i
++)
1237 struct deferred_opt
*opt
= &deferred_opts
[i
];
1239 if (opt
->code
== OPT_MT
|| opt
->code
== OPT_MQ
)
1240 deps_add_target (deps
, opt
->arg
, opt
->code
== OPT_MQ
);
1244 /* These settings are appropriate for GCC, but not necessarily so for
1245 cpplib as a library. */
1247 sanitize_cpp_opts (void)
1249 /* If we don't know what style of dependencies to output, complain
1250 if any other dependency switches have been given. */
1251 if (deps_seen
&& cpp_opts
->deps
.style
== DEPS_NONE
)
1252 error ("to generate dependencies you must specify either -M or -MM");
1254 /* -dM and dependencies suppress normal output; do it here so that
1255 the last -d[MDN] switch overrides earlier ones. */
1256 if (flag_dump_macros
== 'M')
1259 /* By default, -fdirectives-only implies -dD. This allows subsequent phases
1260 to perform proper macro expansion. */
1261 if (cpp_opts
->directives_only
&& !cpp_opts
->preprocessed
&& !flag_dump_macros
)
1262 flag_dump_macros
= 'D';
1264 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1265 -dM since at least glibc relies on -M -dM to work. */
1266 /* Also, flag_no_output implies flag_no_line_commands, always. */
1269 if (flag_dump_macros
!= 'M')
1270 flag_dump_macros
= 0;
1271 flag_dump_includes
= 0;
1272 flag_no_line_commands
= 1;
1274 else if (cpp_opts
->deps
.missing_files
)
1275 error ("-MG may only be used with -M or -MM");
1277 cpp_opts
->unsigned_char
= !flag_signed_char
;
1278 cpp_opts
->stdc_0_in_system_headers
= STDC_0_IN_SYSTEM_HEADERS
;
1280 /* Wlong-long is disabled by default. It is enabled by:
1281 [-Wpedantic | -Wtraditional] -std=[gnu|c]++98 ; or
1282 [-Wpedantic | -Wtraditional] -std=non-c99 .
1284 Either -Wlong-long or -Wno-long-long override any other settings. */
1285 if (warn_long_long
== -1)
1286 warn_long_long
= ((pedantic
|| warn_traditional
)
1287 && (c_dialect_cxx () ? cxx_dialect
== cxx98
: !flag_isoc99
));
1288 cpp_opts
->cpp_warn_long_long
= warn_long_long
;
1290 /* Similarly with -Wno-variadic-macros. No check for c99 here, since
1291 this also turns off warnings about GCCs extension. */
1292 cpp_opts
->warn_variadic_macros
1293 = warn_variadic_macros
&& (pedantic
|| warn_traditional
);
1295 /* If we're generating preprocessor output, emit current directory
1296 if explicitly requested or if debugging information is enabled.
1297 ??? Maybe we should only do it for debugging formats that
1298 actually output the current directory? */
1299 if (flag_working_directory
== -1)
1300 flag_working_directory
= (debug_info_level
!= DINFO_LEVEL_NONE
);
1302 if (cpp_opts
->directives_only
)
1304 if (warn_unused_macros
)
1305 error ("-fdirectives-only is incompatible with -Wunused_macros");
1306 if (cpp_opts
->traditional
)
1307 error ("-fdirectives-only is incompatible with -traditional");
1311 /* Add include path with a prefix at the front of its name. */
1313 add_prefixed_path (const char *suffix
, size_t chain
)
1317 size_t prefix_len
, suffix_len
;
1319 suffix_len
= strlen (suffix
);
1320 prefix
= iprefix
? iprefix
: cpp_GCC_INCLUDE_DIR
;
1321 prefix_len
= iprefix
? strlen (iprefix
) : cpp_GCC_INCLUDE_DIR_len
;
1323 path
= (char *) xmalloc (prefix_len
+ suffix_len
+ 1);
1324 memcpy (path
, prefix
, prefix_len
);
1325 memcpy (path
+ prefix_len
, suffix
, suffix_len
);
1326 path
[prefix_len
+ suffix_len
] = '\0';
1328 add_path (path
, chain
, 0, false);
1331 /* Handle -D, -U, -A, -imacros, and the first -include. */
1333 c_finish_options (void)
1335 if (!cpp_opts
->preprocessed
)
1340 /* Make sure all of the builtins about to be declared have
1341 BUILTINS_LOCATION has their source_location. */
1342 source_location builtins_loc
= BUILTINS_LOCATION
;
1343 cpp_force_token_locations (parse_in
, &builtins_loc
);
1345 cpp_init_builtins (parse_in
, flag_hosted
);
1346 c_cpp_builtins (parse_in
);
1348 cpp_stop_forcing_token_locations (parse_in
);
1351 /* We're about to send user input to cpplib, so make it warn for
1352 things that we previously (when we sent it internal definitions)
1353 told it to not warn.
1355 C99 permits implementation-defined characters in identifiers.
1356 The documented meaning of -std= is to turn off extensions that
1357 conflict with the specified standard, and since a strictly
1358 conforming program cannot contain a '$', we do not condition
1359 their acceptance on the -std= setting. */
1360 cpp_opts
->warn_dollars
= (cpp_opts
->cpp_pedantic
&& !cpp_opts
->c99
);
1362 cb_file_change (parse_in
,
1363 linemap_add (line_table
, LC_RENAME
, 0,
1364 _("<command-line>"), 0));
1366 for (i
= 0; i
< deferred_count
; i
++)
1368 struct deferred_opt
*opt
= &deferred_opts
[i
];
1370 if (opt
->code
== OPT_D
)
1371 cpp_define (parse_in
, opt
->arg
);
1372 else if (opt
->code
== OPT_U
)
1373 cpp_undef (parse_in
, opt
->arg
);
1374 else if (opt
->code
== OPT_A
)
1376 if (opt
->arg
[0] == '-')
1377 cpp_unassert (parse_in
, opt
->arg
+ 1);
1379 cpp_assert (parse_in
, opt
->arg
);
1383 /* Start the main input file, if the debug writer wants it. */
1384 if (debug_hooks
->start_end_main_source_file
1385 && !flag_preprocess_only
)
1386 (*debug_hooks
->start_source_file
) (0, this_input_filename
);
1388 /* Handle -imacros after -D and -U. */
1389 for (i
= 0; i
< deferred_count
; i
++)
1391 struct deferred_opt
*opt
= &deferred_opts
[i
];
1393 if (opt
->code
== OPT_imacros
1394 && cpp_push_include (parse_in
, opt
->arg
))
1396 /* Disable push_command_line_include callback for now. */
1397 include_cursor
= deferred_count
+ 1;
1398 cpp_scan_nooutput (parse_in
);
1404 if (cpp_opts
->directives_only
)
1405 cpp_init_special_builtins (parse_in
);
1407 /* Start the main input file, if the debug writer wants it. */
1408 if (debug_hooks
->start_end_main_source_file
1409 && !flag_preprocess_only
)
1410 (*debug_hooks
->start_source_file
) (0, this_input_filename
);
1414 push_command_line_include ();
1417 /* Give CPP the next file given by -include, if any. */
1419 push_command_line_include (void)
1421 while (include_cursor
< deferred_count
)
1423 struct deferred_opt
*opt
= &deferred_opts
[include_cursor
++];
1425 if (!cpp_opts
->preprocessed
&& opt
->code
== OPT_include
1426 && cpp_push_include (parse_in
, opt
->arg
))
1430 if (include_cursor
== deferred_count
)
1433 /* -Wunused-macros should only warn about macros defined hereafter. */
1434 cpp_opts
->warn_unused_macros
= warn_unused_macros
;
1435 /* Restore the line map from <command line>. */
1436 if (!cpp_opts
->preprocessed
)
1437 cpp_change_file (parse_in
, LC_RENAME
, this_input_filename
);
1439 /* Set this here so the client can change the option if it wishes,
1440 and after stacking the main file so we don't trace the main file. */
1441 line_table
->trace_includes
= cpp_opts
->print_include_names
;
1445 /* File change callback. Has to handle -include files. */
1447 cb_file_change (cpp_reader
* ARG_UNUSED (pfile
),
1448 const struct line_map
*new_map
)
1450 if (flag_preprocess_only
)
1451 pp_file_change (new_map
);
1453 fe_file_change (new_map
);
1455 if (new_map
== 0 || (new_map
->reason
== LC_LEAVE
&& MAIN_FILE_P (new_map
)))
1456 push_command_line_include ();
1460 cb_dir_change (cpp_reader
* ARG_UNUSED (pfile
), const char *dir
)
1462 if (!set_src_pwd (dir
))
1463 warning (0, "too late for # directive to set debug directory");
1466 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1467 extensions if ISO). There is no concept of gnu94. */
1469 set_std_c89 (int c94
, int iso
)
1471 cpp_set_lang (parse_in
, c94
? CLK_STDC94
: iso
? CLK_STDC89
: CLK_GNUC89
);
1474 flag_no_gnu_keywords
= iso
;
1475 flag_no_nonansi_builtin
= iso
;
1481 /* Set the C 99 standard (without GNU extensions if ISO). */
1483 set_std_c99 (int iso
)
1485 cpp_set_lang (parse_in
, iso
? CLK_STDC99
: CLK_GNUC99
);
1487 flag_no_nonansi_builtin
= iso
;
1494 /* Set the C 11 standard (without GNU extensions if ISO). */
1496 set_std_c11 (int iso
)
1498 cpp_set_lang (parse_in
, iso
? CLK_STDC11
: CLK_GNUC11
);
1500 flag_no_nonansi_builtin
= iso
;
1507 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1509 set_std_cxx98 (int iso
)
1511 cpp_set_lang (parse_in
, iso
? CLK_CXX98
: CLK_GNUCXX
);
1512 flag_no_gnu_keywords
= iso
;
1513 flag_no_nonansi_builtin
= iso
;
1515 cxx_dialect
= cxx98
;
1518 /* Set the C++ 2011 standard (without GNU extensions if ISO). */
1520 set_std_cxx11 (int iso
)
1522 cpp_set_lang (parse_in
, iso
? CLK_CXX11
: CLK_GNUCXX11
);
1523 flag_no_gnu_keywords
= iso
;
1524 flag_no_nonansi_builtin
= iso
;
1526 /* C++11 includes the C99 standard library. */
1529 cxx_dialect
= cxx11
;
1532 /* Set the C++ 201y draft standard (without GNU extensions if ISO). */
1534 set_std_cxx1y (int iso
)
1536 cpp_set_lang (parse_in
, iso
? CLK_CXX11
: CLK_GNUCXX11
);
1537 flag_no_gnu_keywords
= iso
;
1538 flag_no_nonansi_builtin
= iso
;
1540 /* C++11 includes the C99 standard library. */
1543 cxx_dialect
= cxx1y
;
1546 /* Args to -d specify what to dump. Silently ignore
1547 unrecognized options; they may be aimed at toplev.c. */
1549 handle_OPT_d (const char *arg
)
1553 while ((c
= *arg
++) != '\0')
1556 case 'M': /* Dump macros only. */
1557 case 'N': /* Dump names. */
1558 case 'D': /* Dump definitions. */
1559 case 'U': /* Dump used macros. */
1560 flag_dump_macros
= c
;
1564 flag_dump_includes
= 1;