1 /* C/ObjC/C++ command line option handling.
2 Copyright (C) 2002-2018 Free Software Foundation, Inc.
3 Contributed by Neil Booth.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 3, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
23 #include "coretypes.h"
28 #include "tm_p.h" /* For C_COMMON_OVERRIDE_OPTIONS. */
29 #include "diagnostic.h"
33 #include "langhooks.h"
34 #include "tree-diagnostic.h" /* for virt_loc_aware_diagnostic_finalizer */
36 #include "cppdefault.h"
38 #include "debug.h" /* For debug_hooks. */
40 #include "plugin.h" /* For PLUGIN_INCLUDE_FILE event. */
43 #include "file-prefix-map.h" /* add_*_prefix_map() */
45 #ifndef DOLLARS_IN_IDENTIFIERS
46 # define DOLLARS_IN_IDENTIFIERS true
49 #ifndef TARGET_SYSTEM_ROOT
50 # define TARGET_SYSTEM_ROOT NULL
54 #define TARGET_OPTF(ARG)
58 cpp_options
*cpp_opts
;
61 static const char *this_input_filename
;
63 /* Filename and stream for preprocessed output. */
64 static const char *out_fname
;
65 static FILE *out_stream
;
67 /* Append dependencies to deps_file. */
68 static bool deps_append
;
70 /* If dependency switches (-MF etc.) have been given. */
71 static bool deps_seen
;
76 /* Dependency output file. */
77 static const char *deps_file
;
79 /* The prefix given by -iprefix, if any. */
80 static const char *iprefix
;
82 /* The multilib directory given by -imultilib, if any. */
83 static const char *imultilib
;
85 /* The system root, if any. Overridden by -isysroot. */
86 static const char *sysroot
= TARGET_SYSTEM_ROOT
;
88 /* Zero disables all standard directories for headers. */
89 static bool std_inc
= true;
91 /* Zero disables the C++-specific standard directories for headers. */
92 static bool std_cxx_inc
= true;
94 /* If the quote chain has been split by -I-. */
95 static bool quote_chain_split
;
97 /* Number of deferred options. */
98 static size_t deferred_count
;
100 /* Number of deferred options scanned for -include. */
101 static size_t include_cursor
;
103 /* Dump files/flags to use during parsing. */
104 static FILE *original_dump_file
= NULL
;
105 static dump_flags_t original_dump_flags
;
107 /* Whether any standard preincluded header has been preincluded. */
108 static bool done_preinclude
;
110 static void handle_OPT_d (const char *);
111 static void set_std_cxx98 (int);
112 static void set_std_cxx11 (int);
113 static void set_std_cxx14 (int);
114 static void set_std_cxx17 (int);
115 static void set_std_cxx2a (int);
116 static void set_std_c89 (int, int);
117 static void set_std_c99 (int);
118 static void set_std_c11 (int);
119 static void set_std_c17 (int);
120 static void check_deps_environment_vars (void);
121 static void handle_deferred_opts (void);
122 static void sanitize_cpp_opts (void);
123 static void add_prefixed_path (const char *, incpath_kind
);
124 static void push_command_line_include (void);
125 static void cb_file_change (cpp_reader
*, const line_map_ordinary
*);
126 static void cb_dir_change (cpp_reader
*, const char *);
127 static void c_finish_options (void);
129 #ifndef STDC_0_IN_SYSTEM_HEADERS
130 #define STDC_0_IN_SYSTEM_HEADERS 0
133 /* Holds switches parsed by c_common_handle_option (), but whose
134 handling is deferred to c_common_post_options (). */
135 static void defer_opt (enum opt_code
, const char *);
136 static struct deferred_opt
143 extern const unsigned int
144 c_family_lang_mask
= (CL_C
| CL_CXX
| CL_ObjC
| CL_ObjCXX
);
146 /* Defer option CODE with argument ARG. */
148 defer_opt (enum opt_code code
, const char *arg
)
150 deferred_opts
[deferred_count
].code
= code
;
151 deferred_opts
[deferred_count
].arg
= arg
;
155 /* Return language mask for option parsing. */
157 c_common_option_lang_mask (void)
159 static const unsigned int lang_flags
[] = {CL_C
, CL_ObjC
, CL_CXX
, CL_ObjCXX
};
161 return lang_flags
[c_language
];
164 /* Diagnostic finalizer for C/C++/Objective-C/Objective-C++. */
166 c_diagnostic_finalizer (diagnostic_context
*context
,
167 diagnostic_info
*diagnostic
)
169 diagnostic_show_locus (context
, diagnostic
->richloc
, diagnostic
->kind
);
170 /* By default print macro expansion contexts in the diagnostic
171 finalizer -- for tokens resulting from macro expansion. */
172 virt_loc_aware_diagnostic_finalizer (context
, diagnostic
);
173 pp_destroy_prefix (context
->printer
);
174 pp_flush (context
->printer
);
177 /* Common default settings for diagnostics. */
179 c_common_diagnostics_set_defaults (diagnostic_context
*context
)
181 diagnostic_finalizer (context
) = c_diagnostic_finalizer
;
182 context
->opt_permissive
= OPT_fpermissive
;
185 /* Whether options from all C-family languages should be accepted
187 static bool accept_all_c_family_options
= false;
189 /* Return whether to complain about a wrong-language option. */
191 c_common_complain_wrong_lang_p (const struct cl_option
*option
)
193 if (accept_all_c_family_options
194 && (option
->flags
& c_family_lang_mask
))
200 /* Initialize options structure OPTS. */
202 c_common_init_options_struct (struct gcc_options
*opts
)
204 opts
->x_flag_exceptions
= c_dialect_cxx ();
205 opts
->x_warn_pointer_arith
= c_dialect_cxx ();
206 opts
->x_warn_write_strings
= c_dialect_cxx ();
207 opts
->x_flag_warn_unused_result
= true;
209 /* By default, C99-like requirements for complex multiply and divide. */
210 opts
->x_flag_complex_method
= 2;
213 /* Common initialization before calling option handlers. */
215 c_common_init_options (unsigned int decoded_options_count
,
216 struct cl_decoded_option
*decoded_options
)
219 struct cpp_callbacks
*cb
;
222 = new (ggc_alloc
<string_concat_db
> ()) string_concat_db ();
224 parse_in
= cpp_create_reader (c_dialect_cxx () ? CLK_GNUCXX
: CLK_GNUC89
,
225 ident_hash
, line_table
);
226 cb
= cpp_get_callbacks (parse_in
);
227 cb
->error
= c_cpp_error
;
229 cpp_opts
= cpp_get_options (parse_in
);
230 cpp_opts
->dollars_in_ident
= DOLLARS_IN_IDENTIFIERS
;
231 cpp_opts
->objc
= c_dialect_objc ();
233 /* Reset to avoid warnings on internal definitions. We set it just
234 before passing on command-line options to cpplib. */
235 cpp_opts
->warn_dollars
= 0;
237 deferred_opts
= XNEWVEC (struct deferred_opt
, decoded_options_count
);
239 if (c_language
== clk_c
)
241 /* The default for C is gnu17. */
242 set_std_c17 (false /* ISO */);
244 /* If preprocessing assembly language, accept any of the C-family
245 front end options since the driver may pass them through. */
246 for (i
= 1; i
< decoded_options_count
; i
++)
247 if (decoded_options
[i
].opt_index
== OPT_lang_asm
)
249 accept_all_c_family_options
= true;
254 /* Set C++ standard to C++14 if not specified on the command line. */
255 if (c_dialect_cxx ())
256 set_std_cxx14 (/*ISO*/false);
258 global_dc
->colorize_source_p
= true;
261 /* Handle switch SCODE with argument ARG. VALUE is true, unless no-
262 form of an -f or -W option was given. Returns false if the switch was
263 invalid, true if valid. Use HANDLERS in recursive handle_option calls. */
265 c_common_handle_option (size_t scode
, const char *arg
, int value
,
266 int kind
, location_t loc
,
267 const struct cl_option_handlers
*handlers
)
269 const struct cl_option
*option
= &cl_options
[scode
];
270 enum opt_code code
= (enum opt_code
) scode
;
273 /* Prevent resetting the language standard to a C dialect when the driver
274 has already determined that we're looking at assembler input. */
275 bool preprocessing_asm_p
= (cpp_get_options (parse_in
)->lang
== CLK_ASM
);
280 if (cl_options
[code
].flags
& c_family_lang_mask
)
282 if ((option
->flags
& CL_TARGET
)
283 && ! targetcm
.handle_c_option (scode
, arg
, value
))
290 case OPT__output_pch_
:
295 defer_opt (code
, arg
);
299 cpp_opts
->discard_comments
= 0;
303 cpp_opts
->discard_comments
= 0;
304 cpp_opts
->discard_comments_in_macro_exp
= 0;
308 defer_opt (code
, arg
);
312 cpp_opts
->print_include_names
= 1;
316 TARGET_OPTF (xstrdup (arg
));
320 if (strcmp (arg
, "-"))
321 add_path (xstrdup (arg
), INC_BRACKET
, 0, true);
324 if (quote_chain_split
)
325 error ("-I- specified twice");
326 quote_chain_split
= true;
327 split_quote_chain ();
328 inform (input_location
, "obsolete option -I- used, please use -iquote instead");
334 /* When doing dependencies with -M or -MM, suppress normal
335 preprocessed output, but still do -dM etc. as software
336 depends on this. Preprocessed output does occur if -MD, -MMD
337 or environment var dependency generation is used. */
338 cpp_opts
->deps
.style
= (code
== OPT_M
? DEPS_SYSTEM
: DEPS_USER
);
344 cpp_opts
->deps
.style
= (code
== OPT_MD
? DEPS_SYSTEM
: DEPS_USER
);
345 cpp_opts
->deps
.need_preprocessor_output
= true;
356 cpp_opts
->deps
.missing_files
= true;
361 cpp_opts
->deps
.phony_targets
= true;
367 defer_opt (code
, arg
);
371 flag_no_line_commands
= 1;
375 defer_opt (code
, arg
);
379 /* ??? Don't add new options here. Use LangEnabledBy in c.opt. */
381 cpp_opts
->warn_num_sign_change
= value
;
384 case OPT_Walloca_larger_than_
:
386 inform (loc
, "-Walloca-larger-than=0 is meaningless");
389 case OPT_Wvla_larger_than_
:
391 inform (loc
, "-Wvla-larger-than=0 is meaningless");
394 case OPT_Wunknown_pragmas
:
395 /* Set to greater than 1, so that even unknown pragmas in
396 system headers will be warned about. */
397 /* ??? There is no way to handle this automatically for now. */
398 warn_unknown_pragmas
= value
* 2;
402 if (!c_dialect_cxx ())
403 set_std_c89 (false, true);
405 set_std_cxx98 (true);
416 warning (0, "%<-Wabi=1%> is not supported, using =2");
419 warn_abi_version
= value
;
422 case OPT_fcanonical_system_headers
:
423 cpp_opts
->canonical_system_headers
= value
;
426 case OPT_fcond_mismatch
:
427 if (!c_dialect_cxx ())
429 flag_cond_mismatch
= value
;
432 warning (0, "switch %qs is no longer supported", option
->opt_text
);
439 disable_builtin_function (arg
);
442 case OPT_fdirectives_only
:
443 cpp_opts
->directives_only
= value
;
446 case OPT_fdollars_in_identifiers
:
447 cpp_opts
->dollars_in_ident
= value
;
450 case OPT_fmacro_prefix_map_
:
451 add_macro_prefix_map (arg
);
454 case OPT_ffreestanding
:
459 flag_no_builtin
= !value
;
462 case OPT_fconstant_string_class_
:
463 constant_string_class_name
= arg
;
466 case OPT_fextended_identifiers
:
467 cpp_opts
->extended_identifiers
= value
;
470 case OPT_foperator_names
:
471 cpp_opts
->operator_names
= value
;
475 cpp_opts
->restore_pch_deps
= value
;
478 case OPT_fpch_preprocess
:
479 flag_pch_preprocess
= value
;
482 case OPT_fpermissive
:
483 flag_permissive
= value
;
484 global_dc
->permissive
= value
;
487 case OPT_fpreprocessed
:
488 cpp_opts
->preprocessed
= value
;
495 case OPT_ftrack_macro_expansion
:
500 case OPT_ftrack_macro_expansion_
:
501 if (arg
&& *arg
!= '\0')
502 cpp_opts
->track_macro_expansion
= value
;
504 cpp_opts
->track_macro_expansion
= 2;
508 flag_use_repository
= value
;
510 flag_implicit_templates
= 0;
514 /* It is documented that we silently ignore silly values. */
515 if (value
>= 1 && value
<= 100)
516 cpp_opts
->tabstop
= value
;
519 case OPT_fexec_charset_
:
520 cpp_opts
->narrow_charset
= arg
;
523 case OPT_fwide_exec_charset_
:
524 cpp_opts
->wide_charset
= arg
;
527 case OPT_finput_charset_
:
528 cpp_opts
->input_charset
= arg
;
531 case OPT_ftemplate_depth_
:
532 max_tinst_depth
= value
;
535 case OPT_fvisibility_inlines_hidden
:
536 visibility_options
.inlines_hidden
= value
;
539 case OPT_femit_struct_debug_baseonly
:
540 set_struct_debug_option (&global_options
, loc
, "base");
543 case OPT_femit_struct_debug_reduced
:
544 set_struct_debug_option (&global_options
, loc
,
545 "dir:ord:sys,dir:gen:any,ind:base");
548 case OPT_femit_struct_debug_detailed_
:
549 set_struct_debug_option (&global_options
, loc
, arg
);
552 case OPT_fext_numeric_literals
:
553 cpp_opts
->ext_numeric_literals
= value
;
557 add_path (xstrdup (arg
), INC_AFTER
, 0, true);
562 defer_opt (code
, arg
);
574 add_path (xstrdup (arg
), INC_QUOTE
, 0, true);
582 add_path (xstrdup (arg
), INC_SYSTEM
, 0, true);
585 case OPT_iwithprefix
:
586 add_prefixed_path (arg
, INC_SYSTEM
);
589 case OPT_iwithprefixbefore
:
590 add_prefixed_path (arg
, INC_BRACKET
);
594 cpp_set_lang (parse_in
, CLK_ASM
);
595 cpp_opts
->dollars_in_ident
= false;
610 error ("output filename specified twice");
613 case OPT_print_objc_runtime_info
:
614 print_struct_values
= 1;
622 case OPT_std_gnu__98
:
623 if (!preprocessing_asm_p
)
624 set_std_cxx98 (code
== OPT_std_c__98
/* ISO */);
628 case OPT_std_gnu__11
:
629 if (!preprocessing_asm_p
)
630 set_std_cxx11 (code
== OPT_std_c__11
/* ISO */);
634 case OPT_std_gnu__14
:
635 if (!preprocessing_asm_p
)
636 set_std_cxx14 (code
== OPT_std_c__14
/* ISO */);
640 case OPT_std_gnu__17
:
641 if (!preprocessing_asm_p
)
642 set_std_cxx17 (code
== OPT_std_c__17
/* ISO */);
646 case OPT_std_gnu__2a
:
647 if (!preprocessing_asm_p
)
648 set_std_cxx2a (code
== OPT_std_c__2a
/* ISO */);
652 case OPT_std_iso9899_199409
:
653 if (!preprocessing_asm_p
)
654 set_std_c89 (code
== OPT_std_iso9899_199409
/* c94 */, true /* ISO */);
658 if (!preprocessing_asm_p
)
659 set_std_c89 (false /* c94 */, false /* ISO */);
663 if (!preprocessing_asm_p
)
664 set_std_c99 (true /* ISO */);
668 if (!preprocessing_asm_p
)
669 set_std_c99 (false /* ISO */);
673 if (!preprocessing_asm_p
)
674 set_std_c11 (true /* ISO */);
678 if (!preprocessing_asm_p
)
679 set_std_c11 (false /* ISO */);
683 if (!preprocessing_asm_p
)
684 set_std_c17 (true /* ISO */);
688 if (!preprocessing_asm_p
)
689 set_std_c17 (false /* ISO */);
693 cpp_opts
->trigraphs
= 1;
696 case OPT_traditional_cpp
:
697 cpp_opts
->traditional
= 1;
708 C_handle_option_auto (&global_options
, &global_options_set
,
710 c_family_lang_mask
, kind
,
711 loc
, handlers
, global_dc
);
715 ObjC_handle_option_auto (&global_options
, &global_options_set
,
717 c_family_lang_mask
, kind
,
718 loc
, handlers
, global_dc
);
722 CXX_handle_option_auto (&global_options
, &global_options_set
,
724 c_family_lang_mask
, kind
,
725 loc
, handlers
, global_dc
);
729 ObjCXX_handle_option_auto (&global_options
, &global_options_set
,
731 c_family_lang_mask
, kind
,
732 loc
, handlers
, global_dc
);
739 cpp_handle_option_auto (&global_options
, scode
, cpp_opts
);
743 /* Default implementation of TARGET_HANDLE_C_OPTION. */
746 default_handle_c_option (size_t code ATTRIBUTE_UNUSED
,
747 const char *arg ATTRIBUTE_UNUSED
,
748 int value ATTRIBUTE_UNUSED
)
753 /* Post-switch processing. */
755 c_common_post_options (const char **pfilename
)
757 struct cpp_callbacks
*cb
;
759 /* Canonicalize the input and output filenames. */
760 if (in_fnames
== NULL
)
762 in_fnames
= XNEWVEC (const char *, 1);
765 else if (strcmp (in_fnames
[0], "-") == 0)
768 error ("cannot use %<-%> as input filename for a precompiled header");
773 if (out_fname
== NULL
|| !strcmp (out_fname
, "-"))
776 if (cpp_opts
->deps
.style
== DEPS_NONE
)
777 check_deps_environment_vars ();
779 handle_deferred_opts ();
781 sanitize_cpp_opts ();
783 register_include_chains (parse_in
, sysroot
, iprefix
, imultilib
,
784 std_inc
, std_cxx_inc
&& c_dialect_cxx (), verbose
);
786 #ifdef C_COMMON_OVERRIDE_OPTIONS
787 /* Some machines may reject certain combinations of C
788 language-specific options. */
789 C_COMMON_OVERRIDE_OPTIONS
;
792 /* Excess precision other than "fast" requires front-end
794 if (c_dialect_cxx ())
796 if (flag_excess_precision_cmdline
== EXCESS_PRECISION_STANDARD
)
797 sorry ("-fexcess-precision=standard for C++");
798 flag_excess_precision_cmdline
= EXCESS_PRECISION_FAST
;
800 else if (flag_excess_precision_cmdline
== EXCESS_PRECISION_DEFAULT
)
801 flag_excess_precision_cmdline
= (flag_iso
802 ? EXCESS_PRECISION_STANDARD
803 : EXCESS_PRECISION_FAST
);
805 /* ISO C restricts floating-point expression contraction to within
806 source-language expressions (-ffp-contract=on, currently an alias
807 for -ffp-contract=off). */
810 && (global_options_set
.x_flag_fp_contract_mode
811 == (enum fp_contract_mode
) 0)
812 && flag_unsafe_math_optimizations
== 0)
813 flag_fp_contract_mode
= FP_CONTRACT_OFF
;
815 /* If we are compiling C, and we are outside of a standards mode,
816 we can permit the new values from ISO/IEC TS 18661-3 for
817 FLT_EVAL_METHOD. Otherwise, we must restrict the possible values to
818 the set specified in ISO C99/C11. */
821 && (global_options_set
.x_flag_permitted_flt_eval_methods
822 == PERMITTED_FLT_EVAL_METHODS_DEFAULT
))
823 flag_permitted_flt_eval_methods
= PERMITTED_FLT_EVAL_METHODS_TS_18661
;
825 flag_permitted_flt_eval_methods
= PERMITTED_FLT_EVAL_METHODS_C11
;
827 /* By default we use C99 inline semantics in GNU99 or C99 mode. C99
828 inline semantics are not supported in GNU89 or C89 mode. */
829 if (flag_gnu89_inline
== -1)
830 flag_gnu89_inline
= !flag_isoc99
;
831 else if (!flag_gnu89_inline
&& !flag_isoc99
)
832 error ("-fno-gnu89-inline is only supported in GNU99 or C99 mode");
834 /* Default to ObjC sjlj exception handling if NeXT runtime. */
835 if (flag_objc_sjlj_exceptions
< 0)
836 flag_objc_sjlj_exceptions
= flag_next_runtime
;
837 if (flag_objc_exceptions
&& !flag_objc_sjlj_exceptions
)
840 /* If -ffreestanding, -fno-hosted or -fno-builtin then disable
841 pattern recognition. */
842 if (!global_options_set
.x_flag_tree_loop_distribute_patterns
844 flag_tree_loop_distribute_patterns
= 0;
846 /* -Woverlength-strings is off by default, but is enabled by -Wpedantic.
847 It is never enabled in C++, as the minimum limit is not normative
849 if (c_dialect_cxx ())
850 warn_overlength_strings
= 0;
852 /* Wmain is enabled by default in C++ but not in C. */
853 /* Wmain is disabled by default for -ffreestanding (!flag_hosted),
854 even if -Wall or -Wpedantic was given (warn_main will be 2 if set
855 by -Wall, 1 if set by -Wmain). */
857 warn_main
= (c_dialect_cxx () && flag_hosted
) ? 1 : 0;
858 else if (warn_main
== 2)
859 warn_main
= flag_hosted
? 1 : 0;
861 /* In C, -Wall and -Wc++-compat enable -Wenum-compare; if it has not
862 yet been set, it is disabled by default. In C++, it is enabled
864 if (warn_enum_compare
== -1)
865 warn_enum_compare
= c_dialect_cxx () ? 1 : 0;
867 /* -Wpacked-bitfield-compat is on by default for the C languages. The
868 warning is issued in stor-layout.c which is not part of the front-end so
869 we need to selectively turn it on here. */
870 if (warn_packed_bitfield_compat
== -1)
871 warn_packed_bitfield_compat
= 1;
873 /* Special format checking options don't work without -Wformat; warn if
877 warning (OPT_Wformat_y2k
,
878 "-Wformat-y2k ignored without -Wformat");
879 warning (OPT_Wformat_extra_args
,
880 "-Wformat-extra-args ignored without -Wformat");
881 warning (OPT_Wformat_zero_length
,
882 "-Wformat-zero-length ignored without -Wformat");
883 warning (OPT_Wformat_nonliteral
,
884 "-Wformat-nonliteral ignored without -Wformat");
885 warning (OPT_Wformat_contains_nul
,
886 "-Wformat-contains-nul ignored without -Wformat");
887 warning (OPT_Wformat_security
,
888 "-Wformat-security ignored without -Wformat");
891 /* -Wimplicit-function-declaration is enabled by default for C99. */
892 if (warn_implicit_function_declaration
== -1)
893 warn_implicit_function_declaration
= flag_isoc99
;
895 /* -Wimplicit-int is enabled by default for C99. */
896 if (warn_implicit_int
== -1)
897 warn_implicit_int
= flag_isoc99
;
899 /* -Wshift-overflow is enabled by default in C99 and C++11 modes. */
900 if (warn_shift_overflow
== -1)
901 warn_shift_overflow
= cxx_dialect
>= cxx11
|| flag_isoc99
;
903 /* -Wshift-negative-value is enabled by -Wextra in C99 and C++11 modes. */
904 if (warn_shift_negative_value
== -1)
905 warn_shift_negative_value
= (extra_warnings
906 && (cxx_dialect
>= cxx11
|| flag_isoc99
));
908 /* -Wregister is enabled by default in C++17. */
909 if (!global_options_set
.x_warn_register
)
910 warn_register
= cxx_dialect
>= cxx17
;
912 /* Declone C++ 'structors if -Os. */
913 if (flag_declone_ctor_dtor
== -1)
914 flag_declone_ctor_dtor
= optimize_size
;
916 if (flag_abi_compat_version
== 1)
918 warning (0, "%<-fabi-compat-version=1%> is not supported, using =2");
919 flag_abi_compat_version
= 2;
922 /* Change flag_abi_version to be the actual current ABI level, for the
923 benefit of c_cpp_builtins, and to make comparison simpler. */
924 const int latest_abi_version
= 13;
925 /* Generate compatibility aliases for ABI v11 (7.1) by default. */
926 const int abi_compat_default
= 11;
928 #define clamp(X) if (X == 0 || X > latest_abi_version) X = latest_abi_version
929 clamp (flag_abi_version
);
930 clamp (warn_abi_version
);
931 clamp (flag_abi_compat_version
);
934 /* Default -Wabi= or -fabi-compat-version= from each other. */
935 if (warn_abi_version
== -1 && flag_abi_compat_version
!= -1)
936 warn_abi_version
= flag_abi_compat_version
;
937 else if (flag_abi_compat_version
== -1 && warn_abi_version
!= -1)
938 flag_abi_compat_version
= warn_abi_version
;
939 else if (warn_abi_version
== -1 && flag_abi_compat_version
== -1)
941 warn_abi_version
= latest_abi_version
;
942 if (flag_abi_version
== latest_abi_version
)
944 if (warning (OPT_Wabi
, "-Wabi won't warn about anything"))
946 inform (input_location
, "-Wabi warns about differences "
947 "from the most up-to-date ABI, which is also used "
949 inform (input_location
, "use e.g. -Wabi=11 to warn about "
950 "changes from GCC 7");
952 flag_abi_compat_version
= abi_compat_default
;
955 flag_abi_compat_version
= latest_abi_version
;
958 /* By default, enable the new inheriting constructor semantics along with ABI
959 11. New and old should coexist fine, but it is a change in what
960 artificial symbols are generated. */
961 if (!global_options_set
.x_flag_new_inheriting_ctors
)
962 flag_new_inheriting_ctors
= abi_version_at_least (11);
964 /* For GCC 7, only enable DR150 resolution by default if -std=c++17. */
965 if (!global_options_set
.x_flag_new_ttp
)
966 flag_new_ttp
= (cxx_dialect
>= cxx17
);
968 if (cxx_dialect
>= cxx11
)
970 /* If we're allowing C++0x constructs, don't warn about C++98
971 identifiers which are keywords in C++0x. */
972 warn_cxx11_compat
= 0;
973 cpp_opts
->cpp_warn_cxx11_compat
= 0;
975 if (warn_narrowing
== -1)
978 /* Unless -f{,no-}ext-numeric-literals has been used explicitly,
979 for -std=c++{11,14,17,2a} default to -fno-ext-numeric-literals. */
980 if (flag_iso
&& !global_options_set
.x_flag_ext_numeric_literals
)
981 cpp_opts
->ext_numeric_literals
= 0;
983 else if (warn_narrowing
== -1)
986 /* C++17 has stricter evaluation order requirements; let's use some of them
987 for earlier C++ as well, so chaining works as expected. */
989 && flag_strong_eval_order
== -1)
990 flag_strong_eval_order
= (cxx_dialect
>= cxx17
? 2 : 1);
992 /* Global sized deallocation is new in C++14. */
993 if (flag_sized_deallocation
== -1)
994 flag_sized_deallocation
= (cxx_dialect
>= cxx14
);
996 if (flag_extern_tls_init
)
998 if (!TARGET_SUPPORTS_ALIASES
|| !SUPPORTS_WEAK
)
1000 /* Lazy TLS initialization for a variable in another TU requires
1001 alias and weak reference support. */
1002 if (flag_extern_tls_init
> 0)
1003 sorry ("external TLS initialization functions not supported "
1006 flag_extern_tls_init
= 0;
1009 flag_extern_tls_init
= 1;
1012 /* Enable by default only for C++ and C++ with ObjC extensions. */
1013 if (warn_return_type
== -1 && c_dialect_cxx ())
1014 warn_return_type
= 1;
1016 if (num_in_fnames
> 1)
1017 error ("too many filenames given. Type %s --help for usage",
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 (input_location
, "opening output file %s: %m", out_fname
);
1036 init_pp_output (out_stream
);
1042 /* When writing a PCH file, avoid reading some other PCH file,
1043 because the default address space slot then can't be used
1044 for the output PCH file. */
1047 c_common_no_more_pch ();
1048 /* Only -g0 and -gdwarf* are supported with PCH, for other
1049 debug formats we warn here and refuse to load any PCH files. */
1050 if (write_symbols
!= NO_DEBUG
&& write_symbols
!= DWARF2_DEBUG
)
1051 warning (OPT_Wdeprecated
,
1052 "the \"%s\" debug format cannot be used with "
1053 "pre-compiled headers", debug_type_names
[write_symbols
]);
1055 else if (write_symbols
!= NO_DEBUG
&& write_symbols
!= DWARF2_DEBUG
)
1056 c_common_no_more_pch ();
1058 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1059 input_location
= UNKNOWN_LOCATION
;
1062 cb
= cpp_get_callbacks (parse_in
);
1063 cb
->file_change
= cb_file_change
;
1064 cb
->dir_change
= cb_dir_change
;
1065 cpp_post_options (parse_in
);
1066 init_global_opts_from_cpp (&global_options
, cpp_get_options (parse_in
));
1068 input_location
= UNKNOWN_LOCATION
;
1070 *pfilename
= this_input_filename
1071 = cpp_read_main_file (parse_in
, in_fnames
[0]);
1072 /* Don't do any compilation or preprocessing if there is no input file. */
1073 if (this_input_filename
== NULL
)
1079 if (flag_working_directory
1080 && flag_preprocess_only
&& !flag_no_line_commands
)
1081 pp_dir_change (parse_in
, get_src_pwd ());
1083 /* Disable LTO output when outputting a precompiled header. */
1084 if (pch_file
&& flag_lto
)
1087 flag_generate_lto
= 0;
1090 return flag_preprocess_only
;
1093 /* Front end initialization common to C, ObjC and C++. */
1095 c_common_init (void)
1097 /* Set up preprocessor arithmetic. Must be done after call to
1098 c_common_nodes_and_builtins for type nodes to be good. */
1099 cpp_opts
->precision
= TYPE_PRECISION (intmax_type_node
);
1100 cpp_opts
->char_precision
= TYPE_PRECISION (char_type_node
);
1101 cpp_opts
->int_precision
= TYPE_PRECISION (integer_type_node
);
1102 cpp_opts
->wchar_precision
= TYPE_PRECISION (wchar_type_node
);
1103 cpp_opts
->unsigned_wchar
= TYPE_UNSIGNED (wchar_type_node
);
1104 cpp_opts
->bytes_big_endian
= BYTES_BIG_ENDIAN
;
1106 /* This can't happen until after wchar_precision and bytes_big_endian
1108 cpp_init_iconv (parse_in
);
1113 fputs ("Compiler executable checksum: ", stderr
);
1114 for (i
= 0; i
< 16; i
++)
1115 fprintf (stderr
, "%02x", executable_checksum
[i
]);
1116 putc ('\n', stderr
);
1119 /* Has to wait until now so that cpplib has its hash table. */
1122 if (flag_preprocess_only
)
1124 c_finish_options ();
1125 preprocess_file (parse_in
);
1132 /* Initialize the integrated preprocessor after debug output has been
1133 initialized; loop over each input file. */
1135 c_common_parse_file (void)
1142 c_finish_options ();
1143 /* Open the dump file to use for the original dump output
1144 here, to be used during parsing for the current file. */
1145 original_dump_file
= dump_begin (TDI_original
, &original_dump_flags
);
1150 /* And end the main input file, if the debug writer wants it */
1151 if (debug_hooks
->start_end_main_source_file
)
1152 (*debug_hooks
->end_source_file
) (0);
1153 if (++i
>= num_in_fnames
)
1155 cpp_undef_all (parse_in
);
1156 cpp_clear_file_cache (parse_in
);
1158 = cpp_read_main_file (parse_in
, in_fnames
[i
]);
1159 if (original_dump_file
)
1161 dump_end (TDI_original
, original_dump_file
);
1162 original_dump_file
= NULL
;
1164 /* If an input file is missing, abandon further compilation.
1165 cpplib has issued a diagnostic. */
1166 if (!this_input_filename
)
1170 c_parse_final_cleanups ();
1173 /* Returns the appropriate dump file for PHASE to dump with FLAGS. */
1176 get_dump_info (int phase
, dump_flags_t
*flags
)
1178 gcc_assert (phase
== TDI_original
);
1180 *flags
= original_dump_flags
;
1181 return original_dump_file
;
1184 /* Common finish hook for the C, ObjC and C++ front ends. */
1186 c_common_finish (void)
1188 FILE *deps_stream
= NULL
;
1190 /* Note that we write the dependencies even if there are errors. This is
1191 useful for handling outdated generated headers that now trigger errors
1192 (for example, with #error) which would be resolved by re-generating
1193 them. In a sense, this complements -MG. */
1194 if (cpp_opts
->deps
.style
!= DEPS_NONE
)
1196 /* If -M or -MM was seen without -MF, default output to the
1199 deps_stream
= out_stream
;
1200 else if (deps_file
[0] == '-' && deps_file
[1] == '\0')
1201 deps_stream
= stdout
;
1204 deps_stream
= fopen (deps_file
, deps_append
? "a": "w");
1206 fatal_error (input_location
, "opening dependency file %s: %m",
1211 /* For performance, avoid tearing down cpplib's internal structures
1212 with cpp_destroy (). */
1213 cpp_finish (parse_in
, deps_stream
);
1215 if (deps_stream
&& deps_stream
!= out_stream
&& deps_stream
!= stdout
1216 && (ferror (deps_stream
) || fclose (deps_stream
)))
1217 fatal_error (input_location
, "closing dependency file %s: %m", deps_file
);
1219 if (out_stream
&& (ferror (out_stream
) || fclose (out_stream
)))
1220 fatal_error (input_location
, "when writing output to %s: %m", out_fname
);
1223 /* Either of two environment variables can specify output of
1224 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1225 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1226 and DEPS_TARGET is the target to mention in the deps. They also
1227 result in dependency information being appended to the output file
1228 rather than overwriting it, and like Sun's compiler
1229 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1231 check_deps_environment_vars (void)
1235 spec
= getenv ("DEPENDENCIES_OUTPUT");
1237 cpp_opts
->deps
.style
= DEPS_USER
;
1240 spec
= getenv ("SUNPRO_DEPENDENCIES");
1243 cpp_opts
->deps
.style
= DEPS_SYSTEM
;
1244 cpp_opts
->deps
.ignore_main_file
= true;
1250 /* Find the space before the DEPS_TARGET, if there is one. */
1251 char *s
= strchr (spec
, ' ');
1254 /* Let the caller perform MAKE quoting. */
1255 defer_opt (OPT_MT
, s
+ 1);
1259 /* Command line -MF overrides environment variables and default. */
1268 /* Handle deferred command line switches. */
1270 handle_deferred_opts (void)
1275 /* Avoid allocating the deps buffer if we don't need it.
1276 (This flag may be true without there having been -MT or -MQ
1277 options, but we'll still need the deps buffer.) */
1281 deps
= cpp_get_deps (parse_in
);
1283 for (i
= 0; i
< deferred_count
; i
++)
1285 struct deferred_opt
*opt
= &deferred_opts
[i
];
1287 if (opt
->code
== OPT_MT
|| opt
->code
== OPT_MQ
)
1288 deps_add_target (deps
, opt
->arg
, opt
->code
== OPT_MQ
);
1292 /* These settings are appropriate for GCC, but not necessarily so for
1293 cpplib as a library. */
1295 sanitize_cpp_opts (void)
1297 /* If we don't know what style of dependencies to output, complain
1298 if any other dependency switches have been given. */
1299 if (deps_seen
&& cpp_opts
->deps
.style
== DEPS_NONE
)
1300 error ("to generate dependencies you must specify either -M or -MM");
1302 /* -dM and dependencies suppress normal output; do it here so that
1303 the last -d[MDN] switch overrides earlier ones. */
1304 if (flag_dump_macros
== 'M')
1307 /* By default, -fdirectives-only implies -dD. This allows subsequent phases
1308 to perform proper macro expansion. */
1309 if (cpp_opts
->directives_only
&& !cpp_opts
->preprocessed
&& !flag_dump_macros
)
1310 flag_dump_macros
= 'D';
1312 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1313 -dM since at least glibc relies on -M -dM to work. */
1314 /* Also, flag_no_output implies flag_no_line_commands, always. */
1317 if (flag_dump_macros
!= 'M')
1318 flag_dump_macros
= 0;
1319 flag_dump_includes
= 0;
1320 flag_no_line_commands
= 1;
1322 else if (cpp_opts
->deps
.missing_files
)
1323 error ("-MG may only be used with -M or -MM");
1325 cpp_opts
->unsigned_char
= !flag_signed_char
;
1326 cpp_opts
->stdc_0_in_system_headers
= STDC_0_IN_SYSTEM_HEADERS
;
1328 /* Wlong-long is disabled by default. It is enabled by:
1329 [-Wpedantic | -Wtraditional] -std=[gnu|c]++98 ; or
1330 [-Wpedantic | -Wtraditional] -std=non-c99
1332 Either -Wlong-long or -Wno-long-long override any other settings.
1333 ??? These conditions should be handled in c.opt. */
1334 if (warn_long_long
== -1)
1336 warn_long_long
= ((pedantic
|| warn_traditional
)
1337 && (c_dialect_cxx () ? cxx_dialect
== cxx98
: !flag_isoc99
));
1338 cpp_opts
->cpp_warn_long_long
= warn_long_long
;
1341 /* If we're generating preprocessor output, emit current directory
1342 if explicitly requested or if debugging information is enabled.
1343 ??? Maybe we should only do it for debugging formats that
1344 actually output the current directory? */
1345 if (flag_working_directory
== -1)
1346 flag_working_directory
= (debug_info_level
!= DINFO_LEVEL_NONE
);
1348 if (warn_implicit_fallthrough
< 5)
1349 cpp_opts
->cpp_warn_implicit_fallthrough
= warn_implicit_fallthrough
;
1351 cpp_opts
->cpp_warn_implicit_fallthrough
= 0;
1353 if (cpp_opts
->directives_only
)
1355 if (cpp_warn_unused_macros
)
1356 error ("-fdirectives-only is incompatible with -Wunused_macros");
1357 if (cpp_opts
->traditional
)
1358 error ("-fdirectives-only is incompatible with -traditional");
1362 /* Add include path with a prefix at the front of its name. */
1364 add_prefixed_path (const char *suffix
, incpath_kind chain
)
1368 size_t prefix_len
, suffix_len
;
1370 suffix_len
= strlen (suffix
);
1371 prefix
= iprefix
? iprefix
: cpp_GCC_INCLUDE_DIR
;
1372 prefix_len
= iprefix
? strlen (iprefix
) : cpp_GCC_INCLUDE_DIR_len
;
1374 path
= (char *) xmalloc (prefix_len
+ suffix_len
+ 1);
1375 memcpy (path
, prefix
, prefix_len
);
1376 memcpy (path
+ prefix_len
, suffix
, suffix_len
);
1377 path
[prefix_len
+ suffix_len
] = '\0';
1379 add_path (path
, chain
, 0, false);
1382 /* Handle -D, -U, -A, -imacros, and the first -include. */
1384 c_finish_options (void)
1386 if (!cpp_opts
->preprocessed
)
1390 cb_file_change (parse_in
,
1391 linemap_check_ordinary (linemap_add (line_table
,
1395 /* Make sure all of the builtins about to be declared have
1396 BUILTINS_LOCATION has their source_location. */
1397 source_location builtins_loc
= BUILTINS_LOCATION
;
1398 cpp_force_token_locations (parse_in
, &builtins_loc
);
1400 cpp_init_builtins (parse_in
, flag_hosted
);
1401 c_cpp_builtins (parse_in
);
1403 cpp_stop_forcing_token_locations (parse_in
);
1405 /* We're about to send user input to cpplib, so make it warn for
1406 things that we previously (when we sent it internal definitions)
1407 told it to not warn.
1409 C99 permits implementation-defined characters in identifiers.
1410 The documented meaning of -std= is to turn off extensions that
1411 conflict with the specified standard, and since a strictly
1412 conforming program cannot contain a '$', we do not condition
1413 their acceptance on the -std= setting. */
1414 cpp_opts
->warn_dollars
= (cpp_opts
->cpp_pedantic
&& !cpp_opts
->c99
);
1416 cb_file_change (parse_in
,
1417 linemap_check_ordinary (linemap_add (line_table
, LC_RENAME
, 0,
1418 _("<command-line>"), 0)));
1420 for (i
= 0; i
< deferred_count
; i
++)
1422 struct deferred_opt
*opt
= &deferred_opts
[i
];
1424 if (opt
->code
== OPT_D
)
1425 cpp_define (parse_in
, opt
->arg
);
1426 else if (opt
->code
== OPT_U
)
1427 cpp_undef (parse_in
, opt
->arg
);
1428 else if (opt
->code
== OPT_A
)
1430 if (opt
->arg
[0] == '-')
1431 cpp_unassert (parse_in
, opt
->arg
+ 1);
1433 cpp_assert (parse_in
, opt
->arg
);
1437 /* Start the main input file, if the debug writer wants it. */
1438 if (debug_hooks
->start_end_main_source_file
1439 && !flag_preprocess_only
)
1440 (*debug_hooks
->start_source_file
) (0, this_input_filename
);
1442 /* Handle -imacros after -D and -U. */
1443 for (i
= 0; i
< deferred_count
; i
++)
1445 struct deferred_opt
*opt
= &deferred_opts
[i
];
1447 if (opt
->code
== OPT_imacros
1448 && cpp_push_include (parse_in
, opt
->arg
))
1450 /* Disable push_command_line_include callback for now. */
1451 include_cursor
= deferred_count
+ 1;
1452 cpp_scan_nooutput (parse_in
);
1458 if (cpp_opts
->directives_only
)
1459 cpp_init_special_builtins (parse_in
);
1461 /* Start the main input file, if the debug writer wants it. */
1462 if (debug_hooks
->start_end_main_source_file
1463 && !flag_preprocess_only
)
1464 (*debug_hooks
->start_source_file
) (0, this_input_filename
);
1468 push_command_line_include ();
1471 /* Give CPP the next file given by -include, if any. */
1473 push_command_line_include (void)
1475 /* This can happen if disabled by -imacros for example.
1476 Punt so that we don't set "<command-line>" as the filename for
1478 if (include_cursor
> deferred_count
)
1481 if (!done_preinclude
)
1483 done_preinclude
= true;
1484 if (flag_hosted
&& std_inc
&& !cpp_opts
->preprocessed
)
1486 const char *preinc
= targetcm
.c_preinclude ();
1487 if (preinc
&& cpp_push_default_include (parse_in
, preinc
))
1492 pch_cpp_save_state ();
1494 while (include_cursor
< deferred_count
)
1496 struct deferred_opt
*opt
= &deferred_opts
[include_cursor
++];
1498 if (!cpp_opts
->preprocessed
&& opt
->code
== OPT_include
1499 && cpp_push_include (parse_in
, opt
->arg
))
1503 if (include_cursor
== deferred_count
)
1506 /* -Wunused-macros should only warn about macros defined hereafter. */
1507 cpp_opts
->warn_unused_macros
= cpp_warn_unused_macros
;
1508 /* Restore the line map from <command line>. */
1509 if (!cpp_opts
->preprocessed
)
1510 cpp_change_file (parse_in
, LC_RENAME
, this_input_filename
);
1512 /* Set this here so the client can change the option if it wishes,
1513 and after stacking the main file so we don't trace the main file. */
1514 line_table
->trace_includes
= cpp_opts
->print_include_names
;
1518 /* File change callback. Has to handle -include files. */
1520 cb_file_change (cpp_reader
* ARG_UNUSED (pfile
),
1521 const line_map_ordinary
*new_map
)
1523 if (flag_preprocess_only
)
1524 pp_file_change (new_map
);
1526 fe_file_change (new_map
);
1529 && (new_map
->reason
== LC_ENTER
|| new_map
->reason
== LC_RENAME
))
1531 /* Signal to plugins that a file is included. This could happen
1532 several times with the same file path, e.g. because of
1533 several '#include' or '#line' directives... */
1534 invoke_plugin_callbacks
1535 (PLUGIN_INCLUDE_FILE
,
1536 const_cast<char*> (ORDINARY_MAP_FILE_NAME (new_map
)));
1539 if (new_map
== 0 || (new_map
->reason
== LC_LEAVE
&& MAIN_FILE_P (new_map
)))
1541 pch_cpp_save_state ();
1542 push_command_line_include ();
1547 cb_dir_change (cpp_reader
* ARG_UNUSED (pfile
), const char *dir
)
1549 if (!set_src_pwd (dir
))
1550 warning (0, "too late for # directive to set debug directory");
1553 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1554 extensions if ISO). There is no concept of gnu94. */
1556 set_std_c89 (int c94
, int iso
)
1558 cpp_set_lang (parse_in
, c94
? CLK_STDC94
: iso
? CLK_STDC89
: CLK_GNUC89
);
1561 flag_no_gnu_keywords
= iso
;
1562 flag_no_nonansi_builtin
= iso
;
1566 lang_hooks
.name
= "GNU C89";
1569 /* Set the C 99 standard (without GNU extensions if ISO). */
1571 set_std_c99 (int iso
)
1573 cpp_set_lang (parse_in
, iso
? CLK_STDC99
: CLK_GNUC99
);
1575 flag_no_nonansi_builtin
= iso
;
1580 lang_hooks
.name
= "GNU C99";
1583 /* Set the C 11 standard (without GNU extensions if ISO). */
1585 set_std_c11 (int iso
)
1587 cpp_set_lang (parse_in
, iso
? CLK_STDC11
: CLK_GNUC11
);
1589 flag_no_nonansi_builtin
= iso
;
1594 lang_hooks
.name
= "GNU C11";
1597 /* Set the C 17 standard (without GNU extensions if ISO). */
1599 set_std_c17 (int iso
)
1601 cpp_set_lang (parse_in
, iso
? CLK_STDC17
: CLK_GNUC17
);
1603 flag_no_nonansi_builtin
= iso
;
1608 lang_hooks
.name
= "GNU C17";
1612 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1614 set_std_cxx98 (int iso
)
1616 cpp_set_lang (parse_in
, iso
? CLK_CXX98
: CLK_GNUCXX
);
1617 flag_no_gnu_keywords
= iso
;
1618 flag_no_nonansi_builtin
= iso
;
1622 cxx_dialect
= cxx98
;
1623 lang_hooks
.name
= "GNU C++98";
1626 /* Set the C++ 2011 standard (without GNU extensions if ISO). */
1628 set_std_cxx11 (int iso
)
1630 cpp_set_lang (parse_in
, iso
? CLK_CXX11
: CLK_GNUCXX11
);
1631 flag_no_gnu_keywords
= iso
;
1632 flag_no_nonansi_builtin
= iso
;
1634 /* C++11 includes the C99 standard library. */
1637 cxx_dialect
= cxx11
;
1638 lang_hooks
.name
= "GNU C++11";
1641 /* Set the C++ 2014 standard (without GNU extensions if ISO). */
1643 set_std_cxx14 (int iso
)
1645 cpp_set_lang (parse_in
, iso
? CLK_CXX14
: CLK_GNUCXX14
);
1646 flag_no_gnu_keywords
= iso
;
1647 flag_no_nonansi_builtin
= iso
;
1649 /* C++14 includes the C99 standard library. */
1652 cxx_dialect
= cxx14
;
1653 lang_hooks
.name
= "GNU C++14";
1656 /* Set the C++ 2017 standard (without GNU extensions if ISO). */
1658 set_std_cxx17 (int iso
)
1660 cpp_set_lang (parse_in
, iso
? CLK_CXX17
: CLK_GNUCXX17
);
1661 flag_no_gnu_keywords
= iso
;
1662 flag_no_nonansi_builtin
= iso
;
1664 /* C++17 includes the C11 standard library. */
1668 cxx_dialect
= cxx17
;
1669 lang_hooks
.name
= "GNU C++17";
1672 /* Set the C++ 202a draft standard (without GNU extensions if ISO). */
1674 set_std_cxx2a (int iso
)
1676 cpp_set_lang (parse_in
, iso
? CLK_CXX2A
: CLK_GNUCXX2A
);
1677 flag_no_gnu_keywords
= iso
;
1678 flag_no_nonansi_builtin
= iso
;
1680 /* C++17 includes the C11 standard library. */
1684 cxx_dialect
= cxx2a
;
1685 lang_hooks
.name
= "GNU C++17"; /* Pretend C++17 until standardization. */
1688 /* Args to -d specify what to dump. Silently ignore
1689 unrecognized options; they may be aimed at toplev.c. */
1691 handle_OPT_d (const char *arg
)
1695 while ((c
= *arg
++) != '\0')
1698 case 'M': /* Dump macros only. */
1699 case 'N': /* Dump names. */
1700 case 'D': /* Dump definitions. */
1701 case 'U': /* Dump used macros. */
1702 flag_dump_macros
= c
;
1706 flag_dump_includes
= 1;