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 set_std_c2x (int);
121 static void check_deps_environment_vars (void);
122 static void handle_deferred_opts (void);
123 static void sanitize_cpp_opts (void);
124 static void add_prefixed_path (const char *, incpath_kind
);
125 static void push_command_line_include (void);
126 static void cb_file_change (cpp_reader
*, const line_map_ordinary
*);
127 static void cb_dir_change (cpp_reader
*, const char *);
128 static void c_finish_options (void);
130 #ifndef STDC_0_IN_SYSTEM_HEADERS
131 #define STDC_0_IN_SYSTEM_HEADERS 0
134 /* Holds switches parsed by c_common_handle_option (), but whose
135 handling is deferred to c_common_post_options (). */
136 static void defer_opt (enum opt_code
, const char *);
137 static struct deferred_opt
144 extern const unsigned int
145 c_family_lang_mask
= (CL_C
| CL_CXX
| CL_ObjC
| CL_ObjCXX
);
147 /* Defer option CODE with argument ARG. */
149 defer_opt (enum opt_code code
, const char *arg
)
151 deferred_opts
[deferred_count
].code
= code
;
152 deferred_opts
[deferred_count
].arg
= arg
;
156 /* Return language mask for option parsing. */
158 c_common_option_lang_mask (void)
160 static const unsigned int lang_flags
[] = {CL_C
, CL_ObjC
, CL_CXX
, CL_ObjCXX
};
162 return lang_flags
[c_language
];
165 /* Diagnostic finalizer for C/C++/Objective-C/Objective-C++. */
167 c_diagnostic_finalizer (diagnostic_context
*context
,
168 diagnostic_info
*diagnostic
,
171 diagnostic_show_locus (context
, diagnostic
->richloc
, diagnostic
->kind
);
172 /* By default print macro expansion contexts in the diagnostic
173 finalizer -- for tokens resulting from macro expansion. */
174 virt_loc_aware_diagnostic_finalizer (context
, diagnostic
);
175 pp_destroy_prefix (context
->printer
);
176 pp_flush (context
->printer
);
179 /* Common default settings for diagnostics. */
181 c_common_diagnostics_set_defaults (diagnostic_context
*context
)
183 diagnostic_finalizer (context
) = c_diagnostic_finalizer
;
184 context
->opt_permissive
= OPT_fpermissive
;
187 /* Whether options from all C-family languages should be accepted
189 static bool accept_all_c_family_options
= false;
191 /* Return whether to complain about a wrong-language option. */
193 c_common_complain_wrong_lang_p (const struct cl_option
*option
)
195 if (accept_all_c_family_options
196 && (option
->flags
& c_family_lang_mask
))
202 /* Initialize options structure OPTS. */
204 c_common_init_options_struct (struct gcc_options
*opts
)
206 opts
->x_flag_exceptions
= c_dialect_cxx ();
207 opts
->x_warn_pointer_arith
= c_dialect_cxx ();
208 opts
->x_warn_write_strings
= c_dialect_cxx ();
209 opts
->x_flag_warn_unused_result
= true;
211 /* By default, C99-like requirements for complex multiply and divide. */
212 opts
->x_flag_complex_method
= 2;
215 /* Common initialization before calling option handlers. */
217 c_common_init_options (unsigned int decoded_options_count
,
218 struct cl_decoded_option
*decoded_options
)
221 struct cpp_callbacks
*cb
;
224 = new (ggc_alloc
<string_concat_db
> ()) string_concat_db ();
226 parse_in
= cpp_create_reader (c_dialect_cxx () ? CLK_GNUCXX
: CLK_GNUC89
,
227 ident_hash
, line_table
);
228 cb
= cpp_get_callbacks (parse_in
);
229 cb
->diagnostic
= c_cpp_diagnostic
;
231 cpp_opts
= cpp_get_options (parse_in
);
232 cpp_opts
->dollars_in_ident
= DOLLARS_IN_IDENTIFIERS
;
233 cpp_opts
->objc
= c_dialect_objc ();
235 /* Reset to avoid warnings on internal definitions. We set it just
236 before passing on command-line options to cpplib. */
237 cpp_opts
->warn_dollars
= 0;
239 deferred_opts
= XNEWVEC (struct deferred_opt
, decoded_options_count
);
241 if (c_language
== clk_c
)
243 /* The default for C is gnu17. */
244 set_std_c17 (false /* ISO */);
246 /* If preprocessing assembly language, accept any of the C-family
247 front end options since the driver may pass them through. */
248 for (i
= 1; i
< decoded_options_count
; i
++)
249 if (decoded_options
[i
].opt_index
== OPT_lang_asm
)
251 accept_all_c_family_options
= true;
256 /* Set C++ standard to C++14 if not specified on the command line. */
257 if (c_dialect_cxx ())
258 set_std_cxx14 (/*ISO*/false);
260 global_dc
->colorize_source_p
= true;
263 /* Handle switch SCODE with argument ARG. VALUE is true, unless no-
264 form of an -f or -W option was given. Returns false if the switch was
265 invalid, true if valid. Use HANDLERS in recursive handle_option calls. */
267 c_common_handle_option (size_t scode
, const char *arg
, HOST_WIDE_INT value
,
268 int kind
, location_t loc
,
269 const struct cl_option_handlers
*handlers
)
271 const struct cl_option
*option
= &cl_options
[scode
];
272 enum opt_code code
= (enum opt_code
) scode
;
275 /* Prevent resetting the language standard to a C dialect when the driver
276 has already determined that we're looking at assembler input. */
277 bool preprocessing_asm_p
= (cpp_get_options (parse_in
)->lang
== CLK_ASM
);
282 if (cl_options
[code
].flags
& c_family_lang_mask
)
284 if ((option
->flags
& CL_TARGET
)
285 && ! targetcm
.handle_c_option (scode
, arg
, value
))
292 case OPT__output_pch_
:
297 defer_opt (code
, arg
);
301 cpp_opts
->discard_comments
= 0;
305 cpp_opts
->discard_comments
= 0;
306 cpp_opts
->discard_comments_in_macro_exp
= 0;
310 defer_opt (code
, arg
);
314 cpp_opts
->print_include_names
= 1;
318 TARGET_OPTF (xstrdup (arg
));
322 if (strcmp (arg
, "-"))
323 add_path (xstrdup (arg
), INC_BRACKET
, 0, true);
326 if (quote_chain_split
)
327 error ("-I- specified twice");
328 quote_chain_split
= true;
329 split_quote_chain ();
330 inform (input_location
, "obsolete option -I- used, please use -iquote instead");
336 /* When doing dependencies with -M or -MM, suppress normal
337 preprocessed output, but still do -dM etc. as software
338 depends on this. Preprocessed output does occur if -MD, -MMD
339 or environment var dependency generation is used. */
340 cpp_opts
->deps
.style
= (code
== OPT_M
? DEPS_SYSTEM
: DEPS_USER
);
346 cpp_opts
->deps
.style
= (code
== OPT_MD
? DEPS_SYSTEM
: DEPS_USER
);
347 cpp_opts
->deps
.need_preprocessor_output
= true;
358 cpp_opts
->deps
.missing_files
= true;
363 cpp_opts
->deps
.phony_targets
= true;
369 defer_opt (code
, arg
);
373 flag_no_line_commands
= 1;
377 defer_opt (code
, arg
);
381 /* ??? Don't add new options here. Use LangEnabledBy in c.opt. */
383 cpp_opts
->warn_num_sign_change
= value
;
386 case OPT_Wunknown_pragmas
:
387 /* Set to greater than 1, so that even unknown pragmas in
388 system headers will be warned about. */
389 /* ??? There is no way to handle this automatically for now. */
390 warn_unknown_pragmas
= value
* 2;
394 if (!c_dialect_cxx ())
395 set_std_c89 (false, true);
397 set_std_cxx98 (true);
408 warning (0, "%<-Wabi=1%> is not supported, using =2");
411 warn_abi_version
= value
;
414 case OPT_fcanonical_system_headers
:
415 cpp_opts
->canonical_system_headers
= value
;
418 case OPT_fcond_mismatch
:
419 if (!c_dialect_cxx ())
421 flag_cond_mismatch
= value
;
424 warning (0, "switch %qs is no longer supported", option
->opt_text
);
431 disable_builtin_function (arg
);
434 case OPT_fdirectives_only
:
435 cpp_opts
->directives_only
= value
;
438 case OPT_fdollars_in_identifiers
:
439 cpp_opts
->dollars_in_ident
= value
;
442 case OPT_fmacro_prefix_map_
:
443 add_macro_prefix_map (arg
);
446 case OPT_ffreestanding
:
451 flag_no_builtin
= !value
;
454 case OPT_fconstant_string_class_
:
455 constant_string_class_name
= arg
;
458 case OPT_fextended_identifiers
:
459 cpp_opts
->extended_identifiers
= value
;
462 case OPT_foperator_names
:
463 cpp_opts
->operator_names
= value
;
467 cpp_opts
->restore_pch_deps
= value
;
470 case OPT_fpch_preprocess
:
471 flag_pch_preprocess
= value
;
474 case OPT_fpermissive
:
475 flag_permissive
= value
;
476 global_dc
->permissive
= value
;
479 case OPT_fpreprocessed
:
480 cpp_opts
->preprocessed
= value
;
487 case OPT_ftrack_macro_expansion
:
492 case OPT_ftrack_macro_expansion_
:
493 if (arg
&& *arg
!= '\0')
494 cpp_opts
->track_macro_expansion
= value
;
496 cpp_opts
->track_macro_expansion
= 2;
500 flag_use_repository
= value
;
502 flag_implicit_templates
= 0;
506 /* It is documented that we silently ignore silly values. */
507 if (value
>= 1 && value
<= 100)
508 cpp_opts
->tabstop
= value
;
511 case OPT_fexec_charset_
:
512 cpp_opts
->narrow_charset
= arg
;
515 case OPT_fwide_exec_charset_
:
516 cpp_opts
->wide_charset
= arg
;
519 case OPT_finput_charset_
:
520 cpp_opts
->input_charset
= arg
;
523 case OPT_ftemplate_depth_
:
524 max_tinst_depth
= value
;
527 case OPT_fvisibility_inlines_hidden
:
528 visibility_options
.inlines_hidden
= value
;
531 case OPT_femit_struct_debug_baseonly
:
532 set_struct_debug_option (&global_options
, loc
, "base");
535 case OPT_femit_struct_debug_reduced
:
536 set_struct_debug_option (&global_options
, loc
,
537 "dir:ord:sys,dir:gen:any,ind:base");
540 case OPT_femit_struct_debug_detailed_
:
541 set_struct_debug_option (&global_options
, loc
, arg
);
544 case OPT_fext_numeric_literals
:
545 cpp_opts
->ext_numeric_literals
= value
;
549 add_path (xstrdup (arg
), INC_AFTER
, 0, true);
554 defer_opt (code
, arg
);
566 add_path (xstrdup (arg
), INC_QUOTE
, 0, true);
574 add_path (xstrdup (arg
), INC_SYSTEM
, 0, true);
577 case OPT_iwithprefix
:
578 add_prefixed_path (arg
, INC_SYSTEM
);
581 case OPT_iwithprefixbefore
:
582 add_prefixed_path (arg
, INC_BRACKET
);
586 cpp_set_lang (parse_in
, CLK_ASM
);
587 cpp_opts
->dollars_in_ident
= false;
602 error ("output filename specified twice");
605 case OPT_print_objc_runtime_info
:
606 print_struct_values
= 1;
614 case OPT_std_gnu__98
:
615 if (!preprocessing_asm_p
)
616 set_std_cxx98 (code
== OPT_std_c__98
/* ISO */);
620 case OPT_std_gnu__11
:
621 if (!preprocessing_asm_p
)
622 set_std_cxx11 (code
== OPT_std_c__11
/* ISO */);
626 case OPT_std_gnu__14
:
627 if (!preprocessing_asm_p
)
628 set_std_cxx14 (code
== OPT_std_c__14
/* ISO */);
632 case OPT_std_gnu__17
:
633 if (!preprocessing_asm_p
)
634 set_std_cxx17 (code
== OPT_std_c__17
/* ISO */);
638 case OPT_std_gnu__2a
:
639 if (!preprocessing_asm_p
)
640 set_std_cxx2a (code
== OPT_std_c__2a
/* ISO */);
644 case OPT_std_iso9899_199409
:
645 if (!preprocessing_asm_p
)
646 set_std_c89 (code
== OPT_std_iso9899_199409
/* c94 */, true /* ISO */);
650 if (!preprocessing_asm_p
)
651 set_std_c89 (false /* c94 */, false /* ISO */);
655 if (!preprocessing_asm_p
)
656 set_std_c99 (true /* ISO */);
660 if (!preprocessing_asm_p
)
661 set_std_c99 (false /* ISO */);
665 if (!preprocessing_asm_p
)
666 set_std_c11 (true /* ISO */);
670 if (!preprocessing_asm_p
)
671 set_std_c11 (false /* ISO */);
675 if (!preprocessing_asm_p
)
676 set_std_c17 (true /* ISO */);
680 if (!preprocessing_asm_p
)
681 set_std_c17 (false /* ISO */);
685 if (!preprocessing_asm_p
)
686 set_std_c2x (true /* ISO */);
690 if (!preprocessing_asm_p
)
691 set_std_c2x (false /* ISO */);
695 cpp_opts
->trigraphs
= 1;
698 case OPT_traditional_cpp
:
699 cpp_opts
->traditional
= 1;
710 C_handle_option_auto (&global_options
, &global_options_set
,
712 c_family_lang_mask
, kind
,
713 loc
, handlers
, global_dc
);
717 ObjC_handle_option_auto (&global_options
, &global_options_set
,
719 c_family_lang_mask
, kind
,
720 loc
, handlers
, global_dc
);
724 CXX_handle_option_auto (&global_options
, &global_options_set
,
726 c_family_lang_mask
, kind
,
727 loc
, handlers
, global_dc
);
731 ObjCXX_handle_option_auto (&global_options
, &global_options_set
,
733 c_family_lang_mask
, kind
,
734 loc
, handlers
, global_dc
);
741 cpp_handle_option_auto (&global_options
, scode
, cpp_opts
);
745 /* Default implementation of TARGET_HANDLE_C_OPTION. */
748 default_handle_c_option (size_t code ATTRIBUTE_UNUSED
,
749 const char *arg ATTRIBUTE_UNUSED
,
750 int value ATTRIBUTE_UNUSED
)
755 /* Post-switch processing. */
757 c_common_post_options (const char **pfilename
)
759 struct cpp_callbacks
*cb
;
761 /* Canonicalize the input and output filenames. */
762 if (in_fnames
== NULL
)
764 in_fnames
= XNEWVEC (const char *, 1);
767 else if (strcmp (in_fnames
[0], "-") == 0)
770 error ("cannot use %<-%> as input filename for a precompiled header");
775 if (out_fname
== NULL
|| !strcmp (out_fname
, "-"))
778 if (cpp_opts
->deps
.style
== DEPS_NONE
)
779 check_deps_environment_vars ();
781 handle_deferred_opts ();
783 sanitize_cpp_opts ();
785 register_include_chains (parse_in
, sysroot
, iprefix
, imultilib
,
786 std_inc
, std_cxx_inc
&& c_dialect_cxx (), verbose
);
788 #ifdef C_COMMON_OVERRIDE_OPTIONS
789 /* Some machines may reject certain combinations of C
790 language-specific options. */
791 C_COMMON_OVERRIDE_OPTIONS
;
794 /* Excess precision other than "fast" requires front-end
796 if (c_dialect_cxx ())
798 if (flag_excess_precision_cmdline
== EXCESS_PRECISION_STANDARD
)
799 sorry ("-fexcess-precision=standard for C++");
800 flag_excess_precision_cmdline
= EXCESS_PRECISION_FAST
;
802 else if (flag_excess_precision_cmdline
== EXCESS_PRECISION_DEFAULT
)
803 flag_excess_precision_cmdline
= (flag_iso
804 ? EXCESS_PRECISION_STANDARD
805 : EXCESS_PRECISION_FAST
);
807 /* ISO C restricts floating-point expression contraction to within
808 source-language expressions (-ffp-contract=on, currently an alias
809 for -ffp-contract=off). */
812 && (global_options_set
.x_flag_fp_contract_mode
813 == (enum fp_contract_mode
) 0)
814 && flag_unsafe_math_optimizations
== 0)
815 flag_fp_contract_mode
= FP_CONTRACT_OFF
;
817 /* If we are compiling C, and we are outside of a standards mode,
818 we can permit the new values from ISO/IEC TS 18661-3 for
819 FLT_EVAL_METHOD. Otherwise, we must restrict the possible values to
820 the set specified in ISO C99/C11. */
823 && (global_options_set
.x_flag_permitted_flt_eval_methods
824 == PERMITTED_FLT_EVAL_METHODS_DEFAULT
))
825 flag_permitted_flt_eval_methods
= PERMITTED_FLT_EVAL_METHODS_TS_18661
;
827 flag_permitted_flt_eval_methods
= PERMITTED_FLT_EVAL_METHODS_C11
;
829 /* By default we use C99 inline semantics in GNU99 or C99 mode. C99
830 inline semantics are not supported in GNU89 or C89 mode. */
831 if (flag_gnu89_inline
== -1)
832 flag_gnu89_inline
= !flag_isoc99
;
833 else if (!flag_gnu89_inline
&& !flag_isoc99
)
834 error ("-fno-gnu89-inline is only supported in GNU99 or C99 mode");
836 /* Default to ObjC sjlj exception handling if NeXT runtime. */
837 if (flag_objc_sjlj_exceptions
< 0)
838 flag_objc_sjlj_exceptions
= flag_next_runtime
;
839 if (flag_objc_exceptions
&& !flag_objc_sjlj_exceptions
)
842 /* If -ffreestanding, -fno-hosted or -fno-builtin then disable
843 pattern recognition. */
844 if (!global_options_set
.x_flag_tree_loop_distribute_patterns
846 flag_tree_loop_distribute_patterns
= 0;
848 /* -Woverlength-strings is off by default, but is enabled by -Wpedantic.
849 It is never enabled in C++, as the minimum limit is not normative
851 if (c_dialect_cxx ())
852 warn_overlength_strings
= 0;
854 /* Wmain is enabled by default in C++ but not in C. */
855 /* Wmain is disabled by default for -ffreestanding (!flag_hosted),
856 even if -Wall or -Wpedantic was given (warn_main will be 2 if set
857 by -Wall, 1 if set by -Wmain). */
859 warn_main
= (c_dialect_cxx () && flag_hosted
) ? 1 : 0;
860 else if (warn_main
== 2)
861 warn_main
= flag_hosted
? 1 : 0;
863 /* In C, -Wall and -Wc++-compat enable -Wenum-compare; if it has not
864 yet been set, it is disabled by default. In C++, it is enabled
866 if (warn_enum_compare
== -1)
867 warn_enum_compare
= c_dialect_cxx () ? 1 : 0;
869 /* -Wpacked-bitfield-compat is on by default for the C languages. The
870 warning is issued in stor-layout.c which is not part of the front-end so
871 we need to selectively turn it on here. */
872 if (warn_packed_bitfield_compat
== -1)
873 warn_packed_bitfield_compat
= 1;
875 /* Special format checking options don't work without -Wformat; warn if
879 warning (OPT_Wformat_y2k
,
880 "-Wformat-y2k ignored without -Wformat");
881 warning (OPT_Wformat_extra_args
,
882 "-Wformat-extra-args ignored without -Wformat");
883 warning (OPT_Wformat_zero_length
,
884 "-Wformat-zero-length ignored without -Wformat");
885 warning (OPT_Wformat_nonliteral
,
886 "-Wformat-nonliteral ignored without -Wformat");
887 warning (OPT_Wformat_contains_nul
,
888 "-Wformat-contains-nul ignored without -Wformat");
889 warning (OPT_Wformat_security
,
890 "-Wformat-security ignored without -Wformat");
893 /* -Wimplicit-function-declaration is enabled by default for C99. */
894 if (warn_implicit_function_declaration
== -1)
895 warn_implicit_function_declaration
= flag_isoc99
;
897 /* -Wimplicit-int is enabled by default for C99. */
898 if (warn_implicit_int
== -1)
899 warn_implicit_int
= flag_isoc99
;
901 /* -Wshift-overflow is enabled by default in C99 and C++11 modes. */
902 if (warn_shift_overflow
== -1)
903 warn_shift_overflow
= cxx_dialect
>= cxx11
|| flag_isoc99
;
905 /* -Wshift-negative-value is enabled by -Wextra in C99 and C++11 modes. */
906 if (warn_shift_negative_value
== -1)
907 warn_shift_negative_value
= (extra_warnings
908 && (cxx_dialect
>= cxx11
|| flag_isoc99
));
910 /* -Wregister is enabled by default in C++17. */
911 if (!global_options_set
.x_warn_register
)
912 warn_register
= cxx_dialect
>= cxx17
;
914 /* Declone C++ 'structors if -Os. */
915 if (flag_declone_ctor_dtor
== -1)
916 flag_declone_ctor_dtor
= optimize_size
;
918 if (flag_abi_compat_version
== 1)
920 warning (0, "%<-fabi-compat-version=1%> is not supported, using =2");
921 flag_abi_compat_version
= 2;
924 /* Change flag_abi_version to be the actual current ABI level, for the
925 benefit of c_cpp_builtins, and to make comparison simpler. */
926 const int latest_abi_version
= 13;
927 /* Generate compatibility aliases for ABI v11 (7.1) by default. */
928 const int abi_compat_default
= 11;
930 #define clamp(X) if (X == 0 || X > latest_abi_version) X = latest_abi_version
931 clamp (flag_abi_version
);
932 clamp (warn_abi_version
);
933 clamp (flag_abi_compat_version
);
936 /* Default -Wabi= or -fabi-compat-version= from each other. */
937 if (warn_abi_version
== -1 && flag_abi_compat_version
!= -1)
938 warn_abi_version
= flag_abi_compat_version
;
939 else if (flag_abi_compat_version
== -1 && warn_abi_version
!= -1)
940 flag_abi_compat_version
= warn_abi_version
;
941 else if (warn_abi_version
== -1 && flag_abi_compat_version
== -1)
943 warn_abi_version
= latest_abi_version
;
944 if (flag_abi_version
== latest_abi_version
)
946 auto_diagnostic_group d
;
947 if (warning (OPT_Wabi
, "-Wabi won't warn about anything"))
949 inform (input_location
, "-Wabi warns about differences "
950 "from the most up-to-date ABI, which is also used "
952 inform (input_location
, "use e.g. -Wabi=11 to warn about "
953 "changes from GCC 7");
955 flag_abi_compat_version
= abi_compat_default
;
958 flag_abi_compat_version
= latest_abi_version
;
961 /* By default, enable the new inheriting constructor semantics along with ABI
962 11. New and old should coexist fine, but it is a change in what
963 artificial symbols are generated. */
964 if (!global_options_set
.x_flag_new_inheriting_ctors
)
965 flag_new_inheriting_ctors
= abi_version_at_least (11);
967 /* For GCC 7, only enable DR150 resolution by default if -std=c++17. */
968 if (!global_options_set
.x_flag_new_ttp
)
969 flag_new_ttp
= (cxx_dialect
>= cxx17
);
971 if (cxx_dialect
>= cxx11
)
973 /* If we're allowing C++0x constructs, don't warn about C++98
974 identifiers which are keywords in C++0x. */
975 warn_cxx11_compat
= 0;
976 cpp_opts
->cpp_warn_cxx11_compat
= 0;
978 if (warn_narrowing
== -1)
981 /* Unless -f{,no-}ext-numeric-literals has been used explicitly,
982 for -std=c++{11,14,17,2a} default to -fno-ext-numeric-literals. */
983 if (flag_iso
&& !global_options_set
.x_flag_ext_numeric_literals
)
984 cpp_opts
->ext_numeric_literals
= 0;
986 else if (warn_narrowing
== -1)
989 /* C++17 has stricter evaluation order requirements; let's use some of them
990 for earlier C++ as well, so chaining works as expected. */
992 && flag_strong_eval_order
== -1)
993 flag_strong_eval_order
= (cxx_dialect
>= cxx17
? 2 : 1);
995 /* Global sized deallocation is new in C++14. */
996 if (flag_sized_deallocation
== -1)
997 flag_sized_deallocation
= (cxx_dialect
>= cxx14
);
999 if (flag_extern_tls_init
)
1001 if (!TARGET_SUPPORTS_ALIASES
|| !SUPPORTS_WEAK
)
1003 /* Lazy TLS initialization for a variable in another TU requires
1004 alias and weak reference support. */
1005 if (flag_extern_tls_init
> 0)
1006 sorry ("external TLS initialization functions not supported "
1009 flag_extern_tls_init
= 0;
1012 flag_extern_tls_init
= 1;
1015 /* Enable by default only for C++ and C++ with ObjC extensions. */
1016 if (warn_return_type
== -1 && c_dialect_cxx ())
1017 warn_return_type
= 1;
1019 if (num_in_fnames
> 1)
1020 error ("too many filenames given. Type %s --help for usage",
1023 if (flag_preprocess_only
)
1025 /* Open the output now. We must do so even if flag_no_output is
1026 on, because there may be other output than from the actual
1027 preprocessing (e.g. from -dM). */
1028 if (out_fname
[0] == '\0')
1029 out_stream
= stdout
;
1031 out_stream
= fopen (out_fname
, "w");
1033 if (out_stream
== NULL
)
1035 fatal_error (input_location
, "opening output file %s: %m", out_fname
);
1039 init_pp_output (out_stream
);
1045 /* When writing a PCH file, avoid reading some other PCH file,
1046 because the default address space slot then can't be used
1047 for the output PCH file. */
1050 c_common_no_more_pch ();
1051 /* Only -g0 and -gdwarf* are supported with PCH, for other
1052 debug formats we warn here and refuse to load any PCH files. */
1053 if (write_symbols
!= NO_DEBUG
&& write_symbols
!= DWARF2_DEBUG
)
1054 warning (OPT_Wdeprecated
,
1055 "the \"%s\" debug format cannot be used with "
1056 "pre-compiled headers", debug_type_names
[write_symbols
]);
1058 else if (write_symbols
!= NO_DEBUG
&& write_symbols
!= DWARF2_DEBUG
)
1059 c_common_no_more_pch ();
1061 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1062 input_location
= UNKNOWN_LOCATION
;
1065 cb
= cpp_get_callbacks (parse_in
);
1066 cb
->file_change
= cb_file_change
;
1067 cb
->dir_change
= cb_dir_change
;
1068 cpp_post_options (parse_in
);
1069 init_global_opts_from_cpp (&global_options
, cpp_get_options (parse_in
));
1071 input_location
= UNKNOWN_LOCATION
;
1073 *pfilename
= this_input_filename
1074 = cpp_read_main_file (parse_in
, in_fnames
[0]);
1075 /* Don't do any compilation or preprocessing if there is no input file. */
1076 if (this_input_filename
== NULL
)
1082 if (flag_working_directory
1083 && flag_preprocess_only
&& !flag_no_line_commands
)
1084 pp_dir_change (parse_in
, get_src_pwd ());
1086 /* Disable LTO output when outputting a precompiled header. */
1087 if (pch_file
&& flag_lto
)
1090 flag_generate_lto
= 0;
1093 return flag_preprocess_only
;
1096 /* Front end initialization common to C, ObjC and C++. */
1098 c_common_init (void)
1100 /* Set up preprocessor arithmetic. Must be done after call to
1101 c_common_nodes_and_builtins for type nodes to be good. */
1102 cpp_opts
->precision
= TYPE_PRECISION (intmax_type_node
);
1103 cpp_opts
->char_precision
= TYPE_PRECISION (char_type_node
);
1104 cpp_opts
->int_precision
= TYPE_PRECISION (integer_type_node
);
1105 cpp_opts
->wchar_precision
= TYPE_PRECISION (wchar_type_node
);
1106 cpp_opts
->unsigned_wchar
= TYPE_UNSIGNED (wchar_type_node
);
1107 cpp_opts
->bytes_big_endian
= BYTES_BIG_ENDIAN
;
1109 /* This can't happen until after wchar_precision and bytes_big_endian
1111 cpp_init_iconv (parse_in
);
1116 fputs ("Compiler executable checksum: ", stderr
);
1117 for (i
= 0; i
< 16; i
++)
1118 fprintf (stderr
, "%02x", executable_checksum
[i
]);
1119 putc ('\n', stderr
);
1122 /* Has to wait until now so that cpplib has its hash table. */
1125 if (flag_preprocess_only
)
1127 c_finish_options ();
1128 preprocess_file (parse_in
);
1135 /* Initialize the integrated preprocessor after debug output has been
1136 initialized; loop over each input file. */
1138 c_common_parse_file (void)
1145 c_finish_options ();
1146 /* Open the dump file to use for the original dump output
1147 here, to be used during parsing for the current file. */
1148 original_dump_file
= dump_begin (TDI_original
, &original_dump_flags
);
1153 /* And end the main input file, if the debug writer wants it */
1154 if (debug_hooks
->start_end_main_source_file
)
1155 (*debug_hooks
->end_source_file
) (0);
1156 if (++i
>= num_in_fnames
)
1158 cpp_undef_all (parse_in
);
1159 cpp_clear_file_cache (parse_in
);
1161 = cpp_read_main_file (parse_in
, in_fnames
[i
]);
1162 if (original_dump_file
)
1164 dump_end (TDI_original
, original_dump_file
);
1165 original_dump_file
= NULL
;
1167 /* If an input file is missing, abandon further compilation.
1168 cpplib has issued a diagnostic. */
1169 if (!this_input_filename
)
1173 c_parse_final_cleanups ();
1176 /* Returns the appropriate dump file for PHASE to dump with FLAGS. */
1179 get_dump_info (int phase
, dump_flags_t
*flags
)
1181 gcc_assert (phase
== TDI_original
);
1183 *flags
= original_dump_flags
;
1184 return original_dump_file
;
1187 /* Common finish hook for the C, ObjC and C++ front ends. */
1189 c_common_finish (void)
1191 FILE *deps_stream
= NULL
;
1193 /* Note that we write the dependencies even if there are errors. This is
1194 useful for handling outdated generated headers that now trigger errors
1195 (for example, with #error) which would be resolved by re-generating
1196 them. In a sense, this complements -MG. */
1197 if (cpp_opts
->deps
.style
!= DEPS_NONE
)
1199 /* If -M or -MM was seen without -MF, default output to the
1202 deps_stream
= out_stream
;
1203 else if (deps_file
[0] == '-' && deps_file
[1] == '\0')
1204 deps_stream
= stdout
;
1207 deps_stream
= fopen (deps_file
, deps_append
? "a": "w");
1209 fatal_error (input_location
, "opening dependency file %s: %m",
1214 /* For performance, avoid tearing down cpplib's internal structures
1215 with cpp_destroy (). */
1216 cpp_finish (parse_in
, deps_stream
);
1218 if (deps_stream
&& deps_stream
!= out_stream
&& deps_stream
!= stdout
1219 && (ferror (deps_stream
) || fclose (deps_stream
)))
1220 fatal_error (input_location
, "closing dependency file %s: %m", deps_file
);
1222 if (out_stream
&& (ferror (out_stream
) || fclose (out_stream
)))
1223 fatal_error (input_location
, "when writing output to %s: %m", out_fname
);
1226 /* Either of two environment variables can specify output of
1227 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1228 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1229 and DEPS_TARGET is the target to mention in the deps. They also
1230 result in dependency information being appended to the output file
1231 rather than overwriting it, and like Sun's compiler
1232 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1234 check_deps_environment_vars (void)
1238 spec
= getenv ("DEPENDENCIES_OUTPUT");
1240 cpp_opts
->deps
.style
= DEPS_USER
;
1243 spec
= getenv ("SUNPRO_DEPENDENCIES");
1246 cpp_opts
->deps
.style
= DEPS_SYSTEM
;
1247 cpp_opts
->deps
.ignore_main_file
= true;
1253 /* Find the space before the DEPS_TARGET, if there is one. */
1254 char *s
= strchr (spec
, ' ');
1257 /* Let the caller perform MAKE quoting. */
1258 defer_opt (OPT_MT
, s
+ 1);
1262 /* Command line -MF overrides environment variables and default. */
1271 /* Handle deferred command line switches. */
1273 handle_deferred_opts (void)
1278 /* Avoid allocating the deps buffer if we don't need it.
1279 (This flag may be true without there having been -MT or -MQ
1280 options, but we'll still need the deps buffer.) */
1284 deps
= cpp_get_deps (parse_in
);
1286 for (i
= 0; i
< deferred_count
; i
++)
1288 struct deferred_opt
*opt
= &deferred_opts
[i
];
1290 if (opt
->code
== OPT_MT
|| opt
->code
== OPT_MQ
)
1291 deps_add_target (deps
, opt
->arg
, opt
->code
== OPT_MQ
);
1295 /* These settings are appropriate for GCC, but not necessarily so for
1296 cpplib as a library. */
1298 sanitize_cpp_opts (void)
1300 /* If we don't know what style of dependencies to output, complain
1301 if any other dependency switches have been given. */
1302 if (deps_seen
&& cpp_opts
->deps
.style
== DEPS_NONE
)
1303 error ("to generate dependencies you must specify either -M or -MM");
1305 /* -dM and dependencies suppress normal output; do it here so that
1306 the last -d[MDN] switch overrides earlier ones. */
1307 if (flag_dump_macros
== 'M')
1310 /* By default, -fdirectives-only implies -dD. This allows subsequent phases
1311 to perform proper macro expansion. */
1312 if (cpp_opts
->directives_only
&& !cpp_opts
->preprocessed
&& !flag_dump_macros
)
1313 flag_dump_macros
= 'D';
1315 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1316 -dM since at least glibc relies on -M -dM to work. */
1317 /* Also, flag_no_output implies flag_no_line_commands, always. */
1320 if (flag_dump_macros
!= 'M')
1321 flag_dump_macros
= 0;
1322 flag_dump_includes
= 0;
1323 flag_no_line_commands
= 1;
1325 else if (cpp_opts
->deps
.missing_files
)
1326 error ("-MG may only be used with -M or -MM");
1328 cpp_opts
->unsigned_char
= !flag_signed_char
;
1329 cpp_opts
->stdc_0_in_system_headers
= STDC_0_IN_SYSTEM_HEADERS
;
1331 /* Wlong-long is disabled by default. It is enabled by:
1332 [-Wpedantic | -Wtraditional] -std=[gnu|c]++98 ; or
1333 [-Wpedantic | -Wtraditional] -std=non-c99
1335 Either -Wlong-long or -Wno-long-long override any other settings.
1336 ??? These conditions should be handled in c.opt. */
1337 if (warn_long_long
== -1)
1339 warn_long_long
= ((pedantic
|| warn_traditional
)
1340 && (c_dialect_cxx () ? cxx_dialect
== cxx98
: !flag_isoc99
));
1341 cpp_opts
->cpp_warn_long_long
= warn_long_long
;
1344 /* If we're generating preprocessor output, emit current directory
1345 if explicitly requested or if debugging information is enabled.
1346 ??? Maybe we should only do it for debugging formats that
1347 actually output the current directory? */
1348 if (flag_working_directory
== -1)
1349 flag_working_directory
= (debug_info_level
!= DINFO_LEVEL_NONE
);
1351 if (warn_implicit_fallthrough
< 5)
1352 cpp_opts
->cpp_warn_implicit_fallthrough
= warn_implicit_fallthrough
;
1354 cpp_opts
->cpp_warn_implicit_fallthrough
= 0;
1356 if (cpp_opts
->directives_only
)
1358 if (cpp_warn_unused_macros
)
1359 error ("-fdirectives-only is incompatible with -Wunused_macros");
1360 if (cpp_opts
->traditional
)
1361 error ("-fdirectives-only is incompatible with -traditional");
1365 /* Add include path with a prefix at the front of its name. */
1367 add_prefixed_path (const char *suffix
, incpath_kind chain
)
1371 size_t prefix_len
, suffix_len
;
1373 suffix_len
= strlen (suffix
);
1374 prefix
= iprefix
? iprefix
: cpp_GCC_INCLUDE_DIR
;
1375 prefix_len
= iprefix
? strlen (iprefix
) : cpp_GCC_INCLUDE_DIR_len
;
1377 path
= (char *) xmalloc (prefix_len
+ suffix_len
+ 1);
1378 memcpy (path
, prefix
, prefix_len
);
1379 memcpy (path
+ prefix_len
, suffix
, suffix_len
);
1380 path
[prefix_len
+ suffix_len
] = '\0';
1382 add_path (path
, chain
, 0, false);
1385 /* Handle -D, -U, -A, -imacros, and the first -include. */
1387 c_finish_options (void)
1389 if (!cpp_opts
->preprocessed
)
1391 const line_map_ordinary
*bltin_map
1392 = linemap_check_ordinary (linemap_add (line_table
, LC_RENAME
, 0,
1393 _("<built-in>"), 0));
1394 cb_file_change (parse_in
, bltin_map
);
1396 /* Make sure all of the builtins about to be declared have
1397 BUILTINS_LOCATION has their location_t. */
1398 cpp_force_token_locations (parse_in
, BUILTINS_LOCATION
);
1400 cpp_init_builtins (parse_in
, flag_hosted
);
1401 c_cpp_builtins (parse_in
);
1403 /* We're about to send user input to cpplib, so make it warn for
1404 things that we previously (when we sent it internal definitions)
1405 told it to not warn.
1407 C99 permits implementation-defined characters in identifiers.
1408 The documented meaning of -std= is to turn off extensions that
1409 conflict with the specified standard, and since a strictly
1410 conforming program cannot contain a '$', we do not condition
1411 their acceptance on the -std= setting. */
1412 cpp_opts
->warn_dollars
= (cpp_opts
->cpp_pedantic
&& !cpp_opts
->c99
);
1414 const line_map_ordinary
*cmd_map
1415 = linemap_check_ordinary (linemap_add (line_table
, LC_RENAME
, 0,
1416 _("<command-line>"), 0));
1417 cb_file_change (parse_in
, cmd_map
);
1419 /* All command line defines must have the same location. */
1420 cpp_force_token_locations (parse_in
, cmd_map
->start_location
);
1421 for (size_t i
= 0; i
< deferred_count
; i
++)
1423 struct deferred_opt
*opt
= &deferred_opts
[i
];
1425 if (opt
->code
== OPT_D
)
1426 cpp_define (parse_in
, opt
->arg
);
1427 else if (opt
->code
== OPT_U
)
1428 cpp_undef (parse_in
, opt
->arg
);
1429 else if (opt
->code
== OPT_A
)
1431 if (opt
->arg
[0] == '-')
1432 cpp_unassert (parse_in
, opt
->arg
+ 1);
1434 cpp_assert (parse_in
, opt
->arg
);
1438 cpp_stop_forcing_token_locations (parse_in
);
1440 else if (cpp_opts
->directives_only
)
1441 cpp_init_special_builtins (parse_in
);
1443 /* Start the main input file, if the debug writer wants it. */
1444 if (debug_hooks
->start_end_main_source_file
1445 && !flag_preprocess_only
)
1446 (*debug_hooks
->start_source_file
) (0, this_input_filename
);
1448 if (!cpp_opts
->preprocessed
)
1449 /* Handle -imacros after -D and -U. */
1450 for (size_t i
= 0; i
< deferred_count
; i
++)
1452 struct deferred_opt
*opt
= &deferred_opts
[i
];
1454 if (opt
->code
== OPT_imacros
1455 && cpp_push_include (parse_in
, opt
->arg
))
1457 /* Disable push_command_line_include callback for now. */
1458 include_cursor
= deferred_count
+ 1;
1459 cpp_scan_nooutput (parse_in
);
1464 push_command_line_include ();
1467 /* Give CPP the next file given by -include, if any. */
1469 push_command_line_include (void)
1471 /* This can happen if disabled by -imacros for example.
1472 Punt so that we don't set "<command-line>" as the filename for
1474 if (include_cursor
> deferred_count
)
1477 if (!done_preinclude
)
1479 done_preinclude
= true;
1480 if (flag_hosted
&& std_inc
&& !cpp_opts
->preprocessed
)
1482 const char *preinc
= targetcm
.c_preinclude ();
1483 if (preinc
&& cpp_push_default_include (parse_in
, preinc
))
1488 pch_cpp_save_state ();
1490 while (include_cursor
< deferred_count
)
1492 struct deferred_opt
*opt
= &deferred_opts
[include_cursor
++];
1494 if (!cpp_opts
->preprocessed
&& opt
->code
== OPT_include
1495 && cpp_push_include (parse_in
, opt
->arg
))
1499 if (include_cursor
== deferred_count
)
1502 /* -Wunused-macros should only warn about macros defined hereafter. */
1503 cpp_opts
->warn_unused_macros
= cpp_warn_unused_macros
;
1504 /* Restore the line map back to the main file. */
1505 if (!cpp_opts
->preprocessed
)
1506 cpp_change_file (parse_in
, LC_RENAME
, this_input_filename
);
1508 /* Set this here so the client can change the option if it wishes,
1509 and after stacking the main file so we don't trace the main file. */
1510 line_table
->trace_includes
= cpp_opts
->print_include_names
;
1514 /* File change callback. Has to handle -include files. */
1516 cb_file_change (cpp_reader
* ARG_UNUSED (pfile
),
1517 const line_map_ordinary
*new_map
)
1519 if (flag_preprocess_only
)
1520 pp_file_change (new_map
);
1522 fe_file_change (new_map
);
1525 && (new_map
->reason
== LC_ENTER
|| new_map
->reason
== LC_RENAME
))
1527 /* Signal to plugins that a file is included. This could happen
1528 several times with the same file path, e.g. because of
1529 several '#include' or '#line' directives... */
1530 invoke_plugin_callbacks
1531 (PLUGIN_INCLUDE_FILE
,
1532 const_cast<char*> (ORDINARY_MAP_FILE_NAME (new_map
)));
1535 if (new_map
== 0 || (new_map
->reason
== LC_LEAVE
&& MAIN_FILE_P (new_map
)))
1537 pch_cpp_save_state ();
1538 push_command_line_include ();
1543 cb_dir_change (cpp_reader
* ARG_UNUSED (pfile
), const char *dir
)
1545 if (!set_src_pwd (dir
))
1546 warning (0, "too late for # directive to set debug directory");
1549 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1550 extensions if ISO). There is no concept of gnu94. */
1552 set_std_c89 (int c94
, int iso
)
1554 cpp_set_lang (parse_in
, c94
? CLK_STDC94
: iso
? CLK_STDC89
: CLK_GNUC89
);
1557 flag_no_gnu_keywords
= iso
;
1558 flag_no_nonansi_builtin
= iso
;
1563 lang_hooks
.name
= "GNU C89";
1566 /* Set the C 99 standard (without GNU extensions if ISO). */
1568 set_std_c99 (int iso
)
1570 cpp_set_lang (parse_in
, iso
? CLK_STDC99
: CLK_GNUC99
);
1572 flag_no_nonansi_builtin
= iso
;
1578 lang_hooks
.name
= "GNU C99";
1581 /* Set the C 11 standard (without GNU extensions if ISO). */
1583 set_std_c11 (int iso
)
1585 cpp_set_lang (parse_in
, iso
? CLK_STDC11
: CLK_GNUC11
);
1587 flag_no_nonansi_builtin
= iso
;
1593 lang_hooks
.name
= "GNU C11";
1596 /* Set the C 17 standard (without GNU extensions if ISO). */
1598 set_std_c17 (int iso
)
1600 cpp_set_lang (parse_in
, iso
? CLK_STDC17
: CLK_GNUC17
);
1602 flag_no_nonansi_builtin
= iso
;
1608 lang_hooks
.name
= "GNU C17";
1611 /* Set the C 2X standard (without GNU extensions if ISO). */
1613 set_std_c2x (int iso
)
1615 cpp_set_lang (parse_in
, iso
? CLK_STDC2X
: CLK_GNUC2X
);
1617 flag_no_nonansi_builtin
= iso
;
1623 lang_hooks
.name
= "GNU C2X";
1627 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1629 set_std_cxx98 (int iso
)
1631 cpp_set_lang (parse_in
, iso
? CLK_CXX98
: CLK_GNUCXX
);
1632 flag_no_gnu_keywords
= iso
;
1633 flag_no_nonansi_builtin
= iso
;
1637 cxx_dialect
= cxx98
;
1638 lang_hooks
.name
= "GNU C++98";
1641 /* Set the C++ 2011 standard (without GNU extensions if ISO). */
1643 set_std_cxx11 (int iso
)
1645 cpp_set_lang (parse_in
, iso
? CLK_CXX11
: CLK_GNUCXX11
);
1646 flag_no_gnu_keywords
= iso
;
1647 flag_no_nonansi_builtin
= iso
;
1649 /* C++11 includes the C99 standard library. */
1652 cxx_dialect
= cxx11
;
1653 lang_hooks
.name
= "GNU C++11";
1656 /* Set the C++ 2014 standard (without GNU extensions if ISO). */
1658 set_std_cxx14 (int iso
)
1660 cpp_set_lang (parse_in
, iso
? CLK_CXX14
: CLK_GNUCXX14
);
1661 flag_no_gnu_keywords
= iso
;
1662 flag_no_nonansi_builtin
= iso
;
1664 /* C++14 includes the C99 standard library. */
1667 cxx_dialect
= cxx14
;
1668 lang_hooks
.name
= "GNU C++14";
1671 /* Set the C++ 2017 standard (without GNU extensions if ISO). */
1673 set_std_cxx17 (int iso
)
1675 cpp_set_lang (parse_in
, iso
? CLK_CXX17
: CLK_GNUCXX17
);
1676 flag_no_gnu_keywords
= iso
;
1677 flag_no_nonansi_builtin
= iso
;
1679 /* C++17 includes the C11 standard library. */
1683 cxx_dialect
= cxx17
;
1684 lang_hooks
.name
= "GNU C++17";
1687 /* Set the C++ 202a draft standard (without GNU extensions if ISO). */
1689 set_std_cxx2a (int iso
)
1691 cpp_set_lang (parse_in
, iso
? CLK_CXX2A
: CLK_GNUCXX2A
);
1692 flag_no_gnu_keywords
= iso
;
1693 flag_no_nonansi_builtin
= iso
;
1695 /* C++17 includes the C11 standard library. */
1699 cxx_dialect
= cxx2a
;
1700 lang_hooks
.name
= "GNU C++17"; /* Pretend C++17 until standardization. */
1703 /* Args to -d specify what to dump. Silently ignore
1704 unrecognized options; they may be aimed at toplev.c. */
1706 handle_OPT_d (const char *arg
)
1710 while ((c
= *arg
++) != '\0')
1713 case 'M': /* Dump macros only. */
1714 case 'N': /* Dump names. */
1715 case 'D': /* Dump definitions. */
1716 case 'U': /* Dump used macros. */
1717 flag_dump_macros
= c
;
1721 flag_dump_includes
= 1;