1 /* C/ObjC/C++ command line option handling.
2 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011,
3 2012 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
);
363 handle_generated_option (&global_options
, &global_options_set
,
364 OPT_Wunused
, NULL
, value
,
365 c_family_lang_mask
, kind
, loc
,
366 handlers
, global_dc
);
368 handle_generated_option (&global_options
, &global_options_set
,
369 OPT_Wimplicit
, NULL
, value
,
370 c_family_lang_mask
, kind
, loc
,
371 handlers
, global_dc
);
372 warn_char_subscripts
= value
;
373 warn_parentheses
= value
;
374 warn_return_type
= value
;
375 warn_sequence_point
= value
; /* Was C only. */
377 warn_sizeof_pointer_memaccess
= value
;
378 if (warn_strict_aliasing
== -1)
379 set_Wstrict_aliasing (&global_options
, value
);
380 warn_address
= value
;
381 if (warn_strict_overflow
== -1)
382 warn_strict_overflow
= value
;
383 warn_array_bounds
= value
;
384 warn_volatile_register_var
= value
;
386 /* Only warn about unknown pragmas that are not in system
388 warn_unknown_pragmas
= value
;
390 warn_uninitialized
= value
;
391 warn_maybe_uninitialized
= value
;
393 if (!c_dialect_cxx ())
395 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding
396 can turn it off only if it's not explicit. */
398 warn_main
= (value
? 2 : 0);
400 /* In C, -Wall and -Wc++-compat turns on -Wenum-compare,
401 which we do here. In C++ it is on by default, which is
402 done in c_common_post_options. */
403 if (warn_enum_compare
== -1)
404 warn_enum_compare
= value
;
408 /* C++-specific warnings. */
409 warn_sign_compare
= 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 cpp_opts
->warn_cxx_operator_names
= value
;
437 case OPT_Wc__0x_compat
:
438 warn_narrowing
= value
;
441 case OPT_Wdeprecated
:
442 cpp_opts
->cpp_warn_deprecated
= value
;
445 case OPT_Wendif_labels
:
446 cpp_opts
->warn_endif_labels
= value
;
454 set_Wformat (atoi (arg
));
458 gcc_assert (value
== 0 || value
== 1);
459 if (warn_implicit_int
== -1)
460 handle_generated_option (&global_options
, &global_options_set
,
461 OPT_Wimplicit_int
, NULL
, value
,
462 c_family_lang_mask
, kind
, loc
, handlers
,
464 if (warn_implicit_function_declaration
== -1)
465 handle_generated_option (&global_options
, &global_options_set
,
466 OPT_Wimplicit_function_declaration
, NULL
,
467 value
, c_family_lang_mask
, kind
, loc
,
468 handlers
, global_dc
);
471 case OPT_Winvalid_pch
:
472 cpp_opts
->warn_invalid_pch
= value
;
475 case OPT_Wliteral_suffix
:
476 cpp_opts
->warn_literal_suffix
= 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_Wtraditional
:
514 cpp_opts
->cpp_warn_traditional
= value
;
518 cpp_opts
->warn_trigraphs
= value
;
522 cpp_opts
->warn_undef
= value
;
525 case OPT_Wunknown_pragmas
:
526 /* Set to greater than 1, so that even unknown pragmas in
527 system headers will be warned about. */
528 warn_unknown_pragmas
= value
* 2;
531 case OPT_Wunused_macros
:
532 warn_unused_macros
= value
;
535 case OPT_Wvariadic_macros
:
536 warn_variadic_macros
= value
;
541 warn_nonvdtor
= true;
545 if (!c_dialect_cxx ())
546 set_std_c89 (false, true);
548 set_std_cxx98 (true);
555 case OPT_fcond_mismatch
:
556 if (!c_dialect_cxx ())
558 flag_cond_mismatch
= value
;
561 warning (0, "switch %qs is no longer supported", option
->opt_text
);
568 disable_builtin_function (arg
);
571 case OPT_fdirectives_only
:
572 cpp_opts
->directives_only
= value
;
575 case OPT_fdollars_in_identifiers
:
576 cpp_opts
->dollars_in_ident
= value
;
579 case OPT_ffreestanding
:
581 /* Fall through.... */
584 flag_no_builtin
= !value
;
587 case OPT_fconstant_string_class_
:
588 constant_string_class_name
= arg
;
591 case OPT_fextended_identifiers
:
592 cpp_opts
->extended_identifiers
= value
;
595 case OPT_foperator_names
:
596 cpp_opts
->operator_names
= value
;
600 cpp_opts
->restore_pch_deps
= value
;
603 case OPT_fpch_preprocess
:
604 flag_pch_preprocess
= value
;
607 case OPT_fpermissive
:
608 flag_permissive
= value
;
609 global_dc
->permissive
= value
;
612 case OPT_fpreprocessed
:
613 cpp_opts
->preprocessed
= value
;
620 case OPT_ftrack_macro_expansion
:
625 case OPT_ftrack_macro_expansion_
:
626 if (arg
&& *arg
!= '\0')
627 cpp_opts
->track_macro_expansion
= value
;
629 cpp_opts
->track_macro_expansion
= 2;
633 flag_use_repository
= value
;
635 flag_implicit_templates
= 0;
639 /* It is documented that we silently ignore silly values. */
640 if (value
>= 1 && value
<= 100)
641 cpp_opts
->tabstop
= value
;
644 case OPT_fexec_charset_
:
645 cpp_opts
->narrow_charset
= arg
;
648 case OPT_fwide_exec_charset_
:
649 cpp_opts
->wide_charset
= arg
;
652 case OPT_finput_charset_
:
653 cpp_opts
->input_charset
= arg
;
656 case OPT_ftemplate_depth_
:
657 max_tinst_depth
= value
;
660 case OPT_fvisibility_inlines_hidden
:
661 visibility_options
.inlines_hidden
= value
;
664 case OPT_femit_struct_debug_baseonly
:
665 set_struct_debug_option (&global_options
, loc
, "base");
668 case OPT_femit_struct_debug_reduced
:
669 set_struct_debug_option (&global_options
, loc
,
670 "dir:ord:sys,dir:gen:any,ind:base");
673 case OPT_femit_struct_debug_detailed_
:
674 set_struct_debug_option (&global_options
, loc
, arg
);
678 add_path (xstrdup (arg
), AFTER
, 0, true);
683 defer_opt (code
, arg
);
695 add_path (xstrdup (arg
), QUOTE
, 0, true);
703 add_path (xstrdup (arg
), SYSTEM
, 0, true);
706 case OPT_iwithprefix
:
707 add_prefixed_path (arg
, SYSTEM
);
710 case OPT_iwithprefixbefore
:
711 add_prefixed_path (arg
, BRACKET
);
715 cpp_set_lang (parse_in
, CLK_ASM
);
716 cpp_opts
->dollars_in_ident
= false;
731 error ("output filename specified twice");
734 /* We need to handle the -Wpedantic switch here, rather than in
735 c_common_post_options, so that a subsequent -Wno-endif-labels
736 is not overridden. */
738 cpp_opts
->cpp_pedantic
= 1;
739 cpp_opts
->warn_endif_labels
= 1;
740 if (warn_pointer_sign
== -1)
741 warn_pointer_sign
= 1;
742 if (warn_overlength_strings
== -1)
743 warn_overlength_strings
= 1;
748 case OPT_print_objc_runtime_info
:
749 print_struct_values
= 1;
757 case OPT_std_gnu__98
:
758 if (!preprocessing_asm_p
)
759 set_std_cxx98 (code
== OPT_std_c__98
/* ISO */);
763 case OPT_std_gnu__11
:
764 if (!preprocessing_asm_p
)
765 set_std_cxx11 (code
== OPT_std_c__11
/* ISO */);
769 case OPT_std_gnu__1y
:
770 if (!preprocessing_asm_p
)
771 set_std_cxx1y (code
== OPT_std_c__11
/* ISO */);
775 case OPT_std_iso9899_199409
:
776 if (!preprocessing_asm_p
)
777 set_std_c89 (code
== OPT_std_iso9899_199409
/* c94 */, true /* ISO */);
781 if (!preprocessing_asm_p
)
782 set_std_c89 (false /* c94 */, false /* ISO */);
786 if (!preprocessing_asm_p
)
787 set_std_c99 (true /* ISO */);
791 if (!preprocessing_asm_p
)
792 set_std_c99 (false /* ISO */);
796 if (!preprocessing_asm_p
)
797 set_std_c11 (true /* ISO */);
801 if (!preprocessing_asm_p
)
802 set_std_c11 (false /* ISO */);
806 cpp_opts
->trigraphs
= 1;
809 case OPT_traditional_cpp
:
810 cpp_opts
->traditional
= 1;
825 C_handle_option_auto (&global_options
, &global_options_set
,
827 c_family_lang_mask
, kind
,
828 loc
, handlers
, global_dc
);
832 ObjC_handle_option_auto (&global_options
, &global_options_set
,
834 c_family_lang_mask
, kind
,
835 loc
, handlers
, global_dc
);
839 CXX_handle_option_auto (&global_options
, &global_options_set
,
841 c_family_lang_mask
, kind
,
842 loc
, handlers
, global_dc
);
846 ObjCXX_handle_option_auto (&global_options
, &global_options_set
,
848 c_family_lang_mask
, kind
,
849 loc
, handlers
, global_dc
);
859 /* Default implementation of TARGET_HANDLE_C_OPTION. */
862 default_handle_c_option (size_t code ATTRIBUTE_UNUSED
,
863 const char *arg ATTRIBUTE_UNUSED
,
864 int value ATTRIBUTE_UNUSED
)
869 /* Post-switch processing. */
871 c_common_post_options (const char **pfilename
)
873 struct cpp_callbacks
*cb
;
875 /* Canonicalize the input and output filenames. */
876 if (in_fnames
== NULL
)
878 in_fnames
= XNEWVEC (const char *, 1);
881 else if (strcmp (in_fnames
[0], "-") == 0)
884 if (out_fname
== NULL
|| !strcmp (out_fname
, "-"))
887 if (cpp_opts
->deps
.style
== DEPS_NONE
)
888 check_deps_environment_vars ();
890 handle_deferred_opts ();
892 sanitize_cpp_opts ();
894 register_include_chains (parse_in
, sysroot
, iprefix
, imultilib
,
895 std_inc
, std_cxx_inc
&& c_dialect_cxx (), verbose
);
897 #ifdef C_COMMON_OVERRIDE_OPTIONS
898 /* Some machines may reject certain combinations of C
899 language-specific options. */
900 C_COMMON_OVERRIDE_OPTIONS
;
903 /* Excess precision other than "fast" requires front-end
905 if (c_dialect_cxx ())
907 if (flag_excess_precision_cmdline
== EXCESS_PRECISION_STANDARD
908 && TARGET_FLT_EVAL_METHOD_NON_DEFAULT
)
909 sorry ("-fexcess-precision=standard for C++");
910 flag_excess_precision_cmdline
= EXCESS_PRECISION_FAST
;
912 else if (flag_excess_precision_cmdline
== EXCESS_PRECISION_DEFAULT
)
913 flag_excess_precision_cmdline
= (flag_iso
914 ? EXCESS_PRECISION_STANDARD
915 : EXCESS_PRECISION_FAST
);
917 /* By default we use C99 inline semantics in GNU99 or C99 mode. C99
918 inline semantics are not supported in GNU89 or C89 mode. */
919 if (flag_gnu89_inline
== -1)
920 flag_gnu89_inline
= !flag_isoc99
;
921 else if (!flag_gnu89_inline
&& !flag_isoc99
)
922 error ("-fno-gnu89-inline is only supported in GNU99 or C99 mode");
924 /* Default to ObjC sjlj exception handling if NeXT runtime. */
925 if (flag_objc_sjlj_exceptions
< 0)
926 flag_objc_sjlj_exceptions
= flag_next_runtime
;
927 if (flag_objc_exceptions
&& !flag_objc_sjlj_exceptions
)
930 /* -Wextra implies the following flags
931 unless explicitly overridden. */
933 /* Wsign-compare is also enabled by -Wall in C++. */
934 if (warn_sign_compare
== -1)
935 warn_sign_compare
= extra_warnings
;
937 /* -Wpointer-sign is disabled by default, but it is enabled if any
938 of -Wall or -Wpedantic are given. */
939 if (warn_pointer_sign
== -1)
940 warn_pointer_sign
= 0;
942 if (warn_strict_aliasing
== -1)
943 warn_strict_aliasing
= 0;
944 if (warn_strict_overflow
== -1)
945 warn_strict_overflow
= 0;
947 /* -Woverlength-strings is off by default, but is enabled by -Wpedantic.
948 It is never enabled in C++, as the minimum limit is not normative
950 if (warn_overlength_strings
== -1 || c_dialect_cxx ())
951 warn_overlength_strings
= 0;
953 /* Wmain is enabled by default in C++ but not in C. */
954 /* Wmain is disabled by default for -ffreestanding (!flag_hosted),
955 even if -Wall was given (warn_main will be 2 if set by -Wall, 1
956 if set by -Wmain). */
958 warn_main
= (c_dialect_cxx () && flag_hosted
) ? 1 : 0;
959 else if (warn_main
== 2)
960 warn_main
= flag_hosted
? 1 : 0;
962 /* In C, -Wconversion enables -Wsign-conversion (unless disabled
963 through -Wno-sign-conversion). While in C++,
964 -Wsign-conversion needs to be requested explicitly. */
965 if (warn_sign_conversion
== -1)
966 warn_sign_conversion
= (c_dialect_cxx ()) ? 0 : warn_conversion
;
968 /* In C, -Wall and -Wc++-compat enable -Wenum-compare, which we do
969 in c_common_handle_option; if it has not yet been set, it is
970 disabled by default. In C++, it is enabled by default. */
971 if (warn_enum_compare
== -1)
972 warn_enum_compare
= c_dialect_cxx () ? 1 : 0;
974 /* -Wpacked-bitfield-compat is on by default for the C languages. The
975 warning is issued in stor-layout.c which is not part of the front-end so
976 we need to selectively turn it on here. */
977 if (warn_packed_bitfield_compat
== -1)
978 warn_packed_bitfield_compat
= 1;
980 /* Special format checking options don't work without -Wformat; warn if
984 warning (OPT_Wformat_y2k
,
985 "-Wformat-y2k ignored without -Wformat");
986 warning (OPT_Wformat_extra_args
,
987 "-Wformat-extra-args ignored without -Wformat");
988 warning (OPT_Wformat_zero_length
,
989 "-Wformat-zero-length ignored without -Wformat");
990 warning (OPT_Wformat_nonliteral
,
991 "-Wformat-nonliteral ignored without -Wformat");
992 warning (OPT_Wformat_contains_nul
,
993 "-Wformat-contains-nul ignored without -Wformat");
994 warning (OPT_Wformat_security
,
995 "-Wformat-security ignored without -Wformat");
998 if (warn_implicit
== -1)
1001 if (warn_implicit_int
== -1)
1002 warn_implicit_int
= 0;
1004 /* -Wimplicit-function-declaration is enabled by default for C99. */
1005 if (warn_implicit_function_declaration
== -1)
1006 warn_implicit_function_declaration
= flag_isoc99
;
1008 if (cxx_dialect
>= cxx0x
)
1010 /* If we're allowing C++0x constructs, don't warn about C++98
1011 identifiers which are keywords in C++0x. */
1012 warn_cxx0x_compat
= 0;
1014 if (warn_narrowing
== -1)
1017 else if (warn_narrowing
== -1)
1020 if (flag_preprocess_only
)
1022 /* Open the output now. We must do so even if flag_no_output is
1023 on, because there may be other output than from the actual
1024 preprocessing (e.g. from -dM). */
1025 if (out_fname
[0] == '\0')
1026 out_stream
= stdout
;
1028 out_stream
= fopen (out_fname
, "w");
1030 if (out_stream
== NULL
)
1032 fatal_error ("opening output file %s: %m", out_fname
);
1036 if (num_in_fnames
> 1)
1037 error ("too many filenames given. Type %s --help for usage",
1040 init_pp_output (out_stream
);
1046 /* When writing a PCH file, avoid reading some other PCH file,
1047 because the default address space slot then can't be used
1048 for the output PCH file. */
1050 c_common_no_more_pch ();
1052 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1053 input_location
= UNKNOWN_LOCATION
;
1056 cb
= cpp_get_callbacks (parse_in
);
1057 cb
->file_change
= cb_file_change
;
1058 cb
->dir_change
= cb_dir_change
;
1059 cpp_post_options (parse_in
);
1061 input_location
= UNKNOWN_LOCATION
;
1063 *pfilename
= this_input_filename
1064 = cpp_read_main_file (parse_in
, in_fnames
[0]);
1065 /* Don't do any compilation or preprocessing if there is no input file. */
1066 if (this_input_filename
== NULL
)
1072 if (flag_working_directory
1073 && flag_preprocess_only
&& !flag_no_line_commands
)
1074 pp_dir_change (parse_in
, get_src_pwd ());
1076 /* Disable LTO output when outputting a precompiled header. */
1077 if (pch_file
&& flag_lto
)
1080 flag_generate_lto
= 0;
1083 return flag_preprocess_only
;
1086 /* Front end initialization common to C, ObjC and C++. */
1088 c_common_init (void)
1090 /* Set up preprocessor arithmetic. Must be done after call to
1091 c_common_nodes_and_builtins for type nodes to be good. */
1092 cpp_opts
->precision
= TYPE_PRECISION (intmax_type_node
);
1093 cpp_opts
->char_precision
= TYPE_PRECISION (char_type_node
);
1094 cpp_opts
->int_precision
= TYPE_PRECISION (integer_type_node
);
1095 cpp_opts
->wchar_precision
= TYPE_PRECISION (wchar_type_node
);
1096 cpp_opts
->unsigned_wchar
= TYPE_UNSIGNED (wchar_type_node
);
1097 cpp_opts
->bytes_big_endian
= BYTES_BIG_ENDIAN
;
1099 /* This can't happen until after wchar_precision and bytes_big_endian
1101 cpp_init_iconv (parse_in
);
1106 fputs ("Compiler executable checksum: ", stderr
);
1107 for (i
= 0; i
< 16; i
++)
1108 fprintf (stderr
, "%02x", executable_checksum
[i
]);
1109 putc ('\n', stderr
);
1112 /* Has to wait until now so that cpplib has its hash table. */
1115 if (flag_preprocess_only
)
1117 c_finish_options ();
1118 preprocess_file (parse_in
);
1125 /* Initialize the integrated preprocessor after debug output has been
1126 initialized; loop over each input file. */
1128 c_common_parse_file (void)
1135 c_finish_options ();
1140 /* And end the main input file, if the debug writer wants it */
1141 if (debug_hooks
->start_end_main_source_file
)
1142 (*debug_hooks
->end_source_file
) (0);
1143 if (++i
>= num_in_fnames
)
1145 cpp_undef_all (parse_in
);
1146 cpp_clear_file_cache (parse_in
);
1148 = cpp_read_main_file (parse_in
, in_fnames
[i
]);
1149 /* If an input file is missing, abandon further compilation.
1150 cpplib has issued a diagnostic. */
1151 if (!this_input_filename
)
1156 /* Common finish hook for the C, ObjC and C++ front ends. */
1158 c_common_finish (void)
1160 FILE *deps_stream
= NULL
;
1162 /* Don't write the deps file if there are errors. */
1163 if (cpp_opts
->deps
.style
!= DEPS_NONE
&& !seen_error ())
1165 /* If -M or -MM was seen without -MF, default output to the
1168 deps_stream
= out_stream
;
1171 deps_stream
= fopen (deps_file
, deps_append
? "a": "w");
1173 fatal_error ("opening dependency file %s: %m", deps_file
);
1177 /* For performance, avoid tearing down cpplib's internal structures
1178 with cpp_destroy (). */
1179 cpp_finish (parse_in
, deps_stream
);
1181 if (deps_stream
&& deps_stream
!= out_stream
1182 && (ferror (deps_stream
) || fclose (deps_stream
)))
1183 fatal_error ("closing dependency file %s: %m", deps_file
);
1185 if (out_stream
&& (ferror (out_stream
) || fclose (out_stream
)))
1186 fatal_error ("when writing output to %s: %m", out_fname
);
1189 /* Either of two environment variables can specify output of
1190 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1191 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1192 and DEPS_TARGET is the target to mention in the deps. They also
1193 result in dependency information being appended to the output file
1194 rather than overwriting it, and like Sun's compiler
1195 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1197 check_deps_environment_vars (void)
1201 spec
= getenv ("DEPENDENCIES_OUTPUT");
1203 cpp_opts
->deps
.style
= DEPS_USER
;
1206 spec
= getenv ("SUNPRO_DEPENDENCIES");
1209 cpp_opts
->deps
.style
= DEPS_SYSTEM
;
1210 cpp_opts
->deps
.ignore_main_file
= true;
1216 /* Find the space before the DEPS_TARGET, if there is one. */
1217 char *s
= strchr (spec
, ' ');
1220 /* Let the caller perform MAKE quoting. */
1221 defer_opt (OPT_MT
, s
+ 1);
1225 /* Command line -MF overrides environment variables and default. */
1234 /* Handle deferred command line switches. */
1236 handle_deferred_opts (void)
1241 /* Avoid allocating the deps buffer if we don't need it.
1242 (This flag may be true without there having been -MT or -MQ
1243 options, but we'll still need the deps buffer.) */
1247 deps
= cpp_get_deps (parse_in
);
1249 for (i
= 0; i
< deferred_count
; i
++)
1251 struct deferred_opt
*opt
= &deferred_opts
[i
];
1253 if (opt
->code
== OPT_MT
|| opt
->code
== OPT_MQ
)
1254 deps_add_target (deps
, opt
->arg
, opt
->code
== OPT_MQ
);
1258 /* These settings are appropriate for GCC, but not necessarily so for
1259 cpplib as a library. */
1261 sanitize_cpp_opts (void)
1263 /* If we don't know what style of dependencies to output, complain
1264 if any other dependency switches have been given. */
1265 if (deps_seen
&& cpp_opts
->deps
.style
== DEPS_NONE
)
1266 error ("to generate dependencies you must specify either -M or -MM");
1268 /* -dM and dependencies suppress normal output; do it here so that
1269 the last -d[MDN] switch overrides earlier ones. */
1270 if (flag_dump_macros
== 'M')
1273 /* By default, -fdirectives-only implies -dD. This allows subsequent phases
1274 to perform proper macro expansion. */
1275 if (cpp_opts
->directives_only
&& !cpp_opts
->preprocessed
&& !flag_dump_macros
)
1276 flag_dump_macros
= 'D';
1278 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1279 -dM since at least glibc relies on -M -dM to work. */
1280 /* Also, flag_no_output implies flag_no_line_commands, always. */
1283 if (flag_dump_macros
!= 'M')
1284 flag_dump_macros
= 0;
1285 flag_dump_includes
= 0;
1286 flag_no_line_commands
= 1;
1288 else if (cpp_opts
->deps
.missing_files
)
1289 error ("-MG may only be used with -M or -MM");
1291 cpp_opts
->unsigned_char
= !flag_signed_char
;
1292 cpp_opts
->stdc_0_in_system_headers
= STDC_0_IN_SYSTEM_HEADERS
;
1294 /* Wlong-long is disabled by default. It is enabled by:
1295 [-Wpedantic | -Wtraditional] -std=[gnu|c]++98 ; or
1296 [-Wpedantic | -Wtraditional] -std=non-c99 .
1298 Either -Wlong-long or -Wno-long-long override any other settings. */
1299 if (warn_long_long
== -1)
1300 warn_long_long
= ((pedantic
|| warn_traditional
)
1301 && (c_dialect_cxx () ? cxx_dialect
== cxx98
: !flag_isoc99
));
1302 cpp_opts
->cpp_warn_long_long
= warn_long_long
;
1304 /* Similarly with -Wno-variadic-macros. No check for c99 here, since
1305 this also turns off warnings about GCCs extension. */
1306 cpp_opts
->warn_variadic_macros
1307 = warn_variadic_macros
&& (pedantic
|| warn_traditional
);
1309 /* If we're generating preprocessor output, emit current directory
1310 if explicitly requested or if debugging information is enabled.
1311 ??? Maybe we should only do it for debugging formats that
1312 actually output the current directory? */
1313 if (flag_working_directory
== -1)
1314 flag_working_directory
= (debug_info_level
!= DINFO_LEVEL_NONE
);
1316 if (cpp_opts
->directives_only
)
1318 if (warn_unused_macros
)
1319 error ("-fdirectives-only is incompatible with -Wunused_macros");
1320 if (cpp_opts
->traditional
)
1321 error ("-fdirectives-only is incompatible with -traditional");
1325 /* Add include path with a prefix at the front of its name. */
1327 add_prefixed_path (const char *suffix
, size_t chain
)
1331 size_t prefix_len
, suffix_len
;
1333 suffix_len
= strlen (suffix
);
1334 prefix
= iprefix
? iprefix
: cpp_GCC_INCLUDE_DIR
;
1335 prefix_len
= iprefix
? strlen (iprefix
) : cpp_GCC_INCLUDE_DIR_len
;
1337 path
= (char *) xmalloc (prefix_len
+ suffix_len
+ 1);
1338 memcpy (path
, prefix
, prefix_len
);
1339 memcpy (path
+ prefix_len
, suffix
, suffix_len
);
1340 path
[prefix_len
+ suffix_len
] = '\0';
1342 add_path (path
, chain
, 0, false);
1345 /* Handle -D, -U, -A, -imacros, and the first -include. */
1347 c_finish_options (void)
1349 if (!cpp_opts
->preprocessed
)
1354 /* Make sure all of the builtins about to be declared have
1355 BUILTINS_LOCATION has their source_location. */
1356 source_location builtins_loc
= BUILTINS_LOCATION
;
1357 cpp_force_token_locations (parse_in
, &builtins_loc
);
1359 cpp_init_builtins (parse_in
, flag_hosted
);
1360 c_cpp_builtins (parse_in
);
1362 cpp_stop_forcing_token_locations (parse_in
);
1365 /* We're about to send user input to cpplib, so make it warn for
1366 things that we previously (when we sent it internal definitions)
1367 told it to not warn.
1369 C99 permits implementation-defined characters in identifiers.
1370 The documented meaning of -std= is to turn off extensions that
1371 conflict with the specified standard, and since a strictly
1372 conforming program cannot contain a '$', we do not condition
1373 their acceptance on the -std= setting. */
1374 cpp_opts
->warn_dollars
= (cpp_opts
->cpp_pedantic
&& !cpp_opts
->c99
);
1376 cb_file_change (parse_in
,
1377 linemap_add (line_table
, LC_RENAME
, 0,
1378 _("<command-line>"), 0));
1380 for (i
= 0; i
< deferred_count
; i
++)
1382 struct deferred_opt
*opt
= &deferred_opts
[i
];
1384 if (opt
->code
== OPT_D
)
1385 cpp_define (parse_in
, opt
->arg
);
1386 else if (opt
->code
== OPT_U
)
1387 cpp_undef (parse_in
, opt
->arg
);
1388 else if (opt
->code
== OPT_A
)
1390 if (opt
->arg
[0] == '-')
1391 cpp_unassert (parse_in
, opt
->arg
+ 1);
1393 cpp_assert (parse_in
, opt
->arg
);
1397 /* Start the main input file, if the debug writer wants it. */
1398 if (debug_hooks
->start_end_main_source_file
1399 && !flag_preprocess_only
)
1400 (*debug_hooks
->start_source_file
) (0, this_input_filename
);
1402 /* Handle -imacros after -D and -U. */
1403 for (i
= 0; i
< deferred_count
; i
++)
1405 struct deferred_opt
*opt
= &deferred_opts
[i
];
1407 if (opt
->code
== OPT_imacros
1408 && cpp_push_include (parse_in
, opt
->arg
))
1410 /* Disable push_command_line_include callback for now. */
1411 include_cursor
= deferred_count
+ 1;
1412 cpp_scan_nooutput (parse_in
);
1418 if (cpp_opts
->directives_only
)
1419 cpp_init_special_builtins (parse_in
);
1421 /* Start the main input file, if the debug writer wants it. */
1422 if (debug_hooks
->start_end_main_source_file
1423 && !flag_preprocess_only
)
1424 (*debug_hooks
->start_source_file
) (0, this_input_filename
);
1428 push_command_line_include ();
1431 /* Give CPP the next file given by -include, if any. */
1433 push_command_line_include (void)
1435 while (include_cursor
< deferred_count
)
1437 struct deferred_opt
*opt
= &deferred_opts
[include_cursor
++];
1439 if (!cpp_opts
->preprocessed
&& opt
->code
== OPT_include
1440 && cpp_push_include (parse_in
, opt
->arg
))
1444 if (include_cursor
== deferred_count
)
1447 /* -Wunused-macros should only warn about macros defined hereafter. */
1448 cpp_opts
->warn_unused_macros
= warn_unused_macros
;
1449 /* Restore the line map from <command line>. */
1450 if (!cpp_opts
->preprocessed
)
1451 cpp_change_file (parse_in
, LC_RENAME
, this_input_filename
);
1453 /* Set this here so the client can change the option if it wishes,
1454 and after stacking the main file so we don't trace the main file. */
1455 line_table
->trace_includes
= cpp_opts
->print_include_names
;
1459 /* File change callback. Has to handle -include files. */
1461 cb_file_change (cpp_reader
* ARG_UNUSED (pfile
),
1462 const struct line_map
*new_map
)
1464 if (flag_preprocess_only
)
1465 pp_file_change (new_map
);
1467 fe_file_change (new_map
);
1469 if (new_map
== 0 || (new_map
->reason
== LC_LEAVE
&& MAIN_FILE_P (new_map
)))
1470 push_command_line_include ();
1474 cb_dir_change (cpp_reader
* ARG_UNUSED (pfile
), const char *dir
)
1476 if (!set_src_pwd (dir
))
1477 warning (0, "too late for # directive to set debug directory");
1480 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1481 extensions if ISO). There is no concept of gnu94. */
1483 set_std_c89 (int c94
, int iso
)
1485 cpp_set_lang (parse_in
, c94
? CLK_STDC94
: iso
? CLK_STDC89
: CLK_GNUC89
);
1488 flag_no_gnu_keywords
= iso
;
1489 flag_no_nonansi_builtin
= iso
;
1495 /* Set the C 99 standard (without GNU extensions if ISO). */
1497 set_std_c99 (int iso
)
1499 cpp_set_lang (parse_in
, iso
? CLK_STDC99
: CLK_GNUC99
);
1501 flag_no_nonansi_builtin
= iso
;
1508 /* Set the C 11 standard (without GNU extensions if ISO). */
1510 set_std_c11 (int iso
)
1512 cpp_set_lang (parse_in
, iso
? CLK_STDC11
: CLK_GNUC11
);
1514 flag_no_nonansi_builtin
= iso
;
1521 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1523 set_std_cxx98 (int iso
)
1525 cpp_set_lang (parse_in
, iso
? CLK_CXX98
: CLK_GNUCXX
);
1526 flag_no_gnu_keywords
= iso
;
1527 flag_no_nonansi_builtin
= iso
;
1529 cxx_dialect
= cxx98
;
1532 /* Set the C++ 2011 standard (without GNU extensions if ISO). */
1534 set_std_cxx11 (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
= cxx11
;
1546 /* Set the C++ 201y draft standard (without GNU extensions if ISO). */
1548 set_std_cxx1y (int iso
)
1550 cpp_set_lang (parse_in
, iso
? CLK_CXX11
: CLK_GNUCXX11
);
1551 flag_no_gnu_keywords
= iso
;
1552 flag_no_nonansi_builtin
= iso
;
1554 /* C++11 includes the C99 standard library. */
1557 cxx_dialect
= cxx1y
;
1560 /* Args to -d specify what to dump. Silently ignore
1561 unrecognized options; they may be aimed at toplev.c. */
1563 handle_OPT_d (const char *arg
)
1567 while ((c
= *arg
++) != '\0')
1570 case 'M': /* Dump macros only. */
1571 case 'N': /* Dump names. */
1572 case 'D': /* Dump definitions. */
1573 case 'U': /* Dump used macros. */
1574 flag_dump_macros
= c
;
1578 flag_dump_includes
= 1;