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
)
170 diagnostic_show_locus (context
, diagnostic
->richloc
, diagnostic
->kind
);
171 /* By default print macro expansion contexts in the diagnostic
172 finalizer -- for tokens resulting from macro expansion. */
173 virt_loc_aware_diagnostic_finalizer (context
, diagnostic
);
174 pp_destroy_prefix (context
->printer
);
175 pp_flush (context
->printer
);
178 /* Common default settings for diagnostics. */
180 c_common_diagnostics_set_defaults (diagnostic_context
*context
)
182 diagnostic_finalizer (context
) = c_diagnostic_finalizer
;
183 context
->opt_permissive
= OPT_fpermissive
;
186 /* Whether options from all C-family languages should be accepted
188 static bool accept_all_c_family_options
= false;
190 /* Return whether to complain about a wrong-language option. */
192 c_common_complain_wrong_lang_p (const struct cl_option
*option
)
194 if (accept_all_c_family_options
195 && (option
->flags
& c_family_lang_mask
))
201 /* Initialize options structure OPTS. */
203 c_common_init_options_struct (struct gcc_options
*opts
)
205 opts
->x_flag_exceptions
= c_dialect_cxx ();
206 opts
->x_warn_pointer_arith
= c_dialect_cxx ();
207 opts
->x_warn_write_strings
= c_dialect_cxx ();
208 opts
->x_flag_warn_unused_result
= true;
210 /* By default, C99-like requirements for complex multiply and divide. */
211 opts
->x_flag_complex_method
= 2;
214 /* Common initialization before calling option handlers. */
216 c_common_init_options (unsigned int decoded_options_count
,
217 struct cl_decoded_option
*decoded_options
)
220 struct cpp_callbacks
*cb
;
223 = new (ggc_alloc
<string_concat_db
> ()) string_concat_db ();
225 parse_in
= cpp_create_reader (c_dialect_cxx () ? CLK_GNUCXX
: CLK_GNUC89
,
226 ident_hash
, line_table
);
227 cb
= cpp_get_callbacks (parse_in
);
228 cb
->diagnostic
= c_cpp_diagnostic
;
230 cpp_opts
= cpp_get_options (parse_in
);
231 cpp_opts
->dollars_in_ident
= DOLLARS_IN_IDENTIFIERS
;
232 cpp_opts
->objc
= c_dialect_objc ();
234 /* Reset to avoid warnings on internal definitions. We set it just
235 before passing on command-line options to cpplib. */
236 cpp_opts
->warn_dollars
= 0;
238 deferred_opts
= XNEWVEC (struct deferred_opt
, decoded_options_count
);
240 if (c_language
== clk_c
)
242 /* The default for C is gnu17. */
243 set_std_c17 (false /* ISO */);
245 /* If preprocessing assembly language, accept any of the C-family
246 front end options since the driver may pass them through. */
247 for (i
= 1; i
< decoded_options_count
; i
++)
248 if (decoded_options
[i
].opt_index
== OPT_lang_asm
)
250 accept_all_c_family_options
= true;
255 /* Set C++ standard to C++14 if not specified on the command line. */
256 if (c_dialect_cxx ())
257 set_std_cxx14 (/*ISO*/false);
259 global_dc
->colorize_source_p
= true;
262 /* Handle switch SCODE with argument ARG. VALUE is true, unless no-
263 form of an -f or -W option was given. Returns false if the switch was
264 invalid, true if valid. Use HANDLERS in recursive handle_option calls. */
266 c_common_handle_option (size_t scode
, const char *arg
, HOST_WIDE_INT value
,
267 int kind
, location_t loc
,
268 const struct cl_option_handlers
*handlers
)
270 const struct cl_option
*option
= &cl_options
[scode
];
271 enum opt_code code
= (enum opt_code
) scode
;
274 /* Prevent resetting the language standard to a C dialect when the driver
275 has already determined that we're looking at assembler input. */
276 bool preprocessing_asm_p
= (cpp_get_options (parse_in
)->lang
== CLK_ASM
);
281 if (cl_options
[code
].flags
& c_family_lang_mask
)
283 if ((option
->flags
& CL_TARGET
)
284 && ! targetcm
.handle_c_option (scode
, arg
, value
))
291 case OPT__output_pch_
:
296 defer_opt (code
, arg
);
300 cpp_opts
->discard_comments
= 0;
304 cpp_opts
->discard_comments
= 0;
305 cpp_opts
->discard_comments_in_macro_exp
= 0;
309 defer_opt (code
, arg
);
313 cpp_opts
->print_include_names
= 1;
317 TARGET_OPTF (xstrdup (arg
));
321 if (strcmp (arg
, "-"))
322 add_path (xstrdup (arg
), INC_BRACKET
, 0, true);
325 if (quote_chain_split
)
326 error ("-I- specified twice");
327 quote_chain_split
= true;
328 split_quote_chain ();
329 inform (input_location
, "obsolete option -I- used, please use -iquote instead");
335 /* When doing dependencies with -M or -MM, suppress normal
336 preprocessed output, but still do -dM etc. as software
337 depends on this. Preprocessed output does occur if -MD, -MMD
338 or environment var dependency generation is used. */
339 cpp_opts
->deps
.style
= (code
== OPT_M
? DEPS_SYSTEM
: DEPS_USER
);
345 cpp_opts
->deps
.style
= (code
== OPT_MD
? DEPS_SYSTEM
: DEPS_USER
);
346 cpp_opts
->deps
.need_preprocessor_output
= true;
357 cpp_opts
->deps
.missing_files
= true;
362 cpp_opts
->deps
.phony_targets
= true;
368 defer_opt (code
, arg
);
372 flag_no_line_commands
= 1;
376 defer_opt (code
, arg
);
380 /* ??? Don't add new options here. Use LangEnabledBy in c.opt. */
382 cpp_opts
->warn_num_sign_change
= value
;
385 case OPT_Wunknown_pragmas
:
386 /* Set to greater than 1, so that even unknown pragmas in
387 system headers will be warned about. */
388 /* ??? There is no way to handle this automatically for now. */
389 warn_unknown_pragmas
= value
* 2;
393 if (!c_dialect_cxx ())
394 set_std_c89 (false, true);
396 set_std_cxx98 (true);
407 warning (0, "%<-Wabi=1%> is not supported, using =2");
410 warn_abi_version
= value
;
413 case OPT_fcanonical_system_headers
:
414 cpp_opts
->canonical_system_headers
= value
;
417 case OPT_fcond_mismatch
:
418 if (!c_dialect_cxx ())
420 flag_cond_mismatch
= value
;
423 warning (0, "switch %qs is no longer supported", option
->opt_text
);
430 disable_builtin_function (arg
);
433 case OPT_fdirectives_only
:
434 cpp_opts
->directives_only
= value
;
437 case OPT_fdollars_in_identifiers
:
438 cpp_opts
->dollars_in_ident
= value
;
441 case OPT_fmacro_prefix_map_
:
442 add_macro_prefix_map (arg
);
445 case OPT_ffreestanding
:
450 flag_no_builtin
= !value
;
453 case OPT_fconstant_string_class_
:
454 constant_string_class_name
= arg
;
457 case OPT_fextended_identifiers
:
458 cpp_opts
->extended_identifiers
= value
;
461 case OPT_foperator_names
:
462 cpp_opts
->operator_names
= value
;
466 cpp_opts
->restore_pch_deps
= value
;
469 case OPT_fpch_preprocess
:
470 flag_pch_preprocess
= value
;
473 case OPT_fpermissive
:
474 flag_permissive
= value
;
475 global_dc
->permissive
= value
;
478 case OPT_fpreprocessed
:
479 cpp_opts
->preprocessed
= value
;
486 case OPT_ftrack_macro_expansion
:
491 case OPT_ftrack_macro_expansion_
:
492 if (arg
&& *arg
!= '\0')
493 cpp_opts
->track_macro_expansion
= value
;
495 cpp_opts
->track_macro_expansion
= 2;
499 flag_use_repository
= value
;
501 flag_implicit_templates
= 0;
505 /* It is documented that we silently ignore silly values. */
506 if (value
>= 1 && value
<= 100)
507 cpp_opts
->tabstop
= value
;
510 case OPT_fexec_charset_
:
511 cpp_opts
->narrow_charset
= arg
;
514 case OPT_fwide_exec_charset_
:
515 cpp_opts
->wide_charset
= arg
;
518 case OPT_finput_charset_
:
519 cpp_opts
->input_charset
= arg
;
522 case OPT_ftemplate_depth_
:
523 max_tinst_depth
= value
;
526 case OPT_fvisibility_inlines_hidden
:
527 visibility_options
.inlines_hidden
= value
;
530 case OPT_femit_struct_debug_baseonly
:
531 set_struct_debug_option (&global_options
, loc
, "base");
534 case OPT_femit_struct_debug_reduced
:
535 set_struct_debug_option (&global_options
, loc
,
536 "dir:ord:sys,dir:gen:any,ind:base");
539 case OPT_femit_struct_debug_detailed_
:
540 set_struct_debug_option (&global_options
, loc
, arg
);
543 case OPT_fext_numeric_literals
:
544 cpp_opts
->ext_numeric_literals
= value
;
548 add_path (xstrdup (arg
), INC_AFTER
, 0, true);
553 defer_opt (code
, arg
);
565 add_path (xstrdup (arg
), INC_QUOTE
, 0, true);
573 add_path (xstrdup (arg
), INC_SYSTEM
, 0, true);
576 case OPT_iwithprefix
:
577 add_prefixed_path (arg
, INC_SYSTEM
);
580 case OPT_iwithprefixbefore
:
581 add_prefixed_path (arg
, INC_BRACKET
);
585 cpp_set_lang (parse_in
, CLK_ASM
);
586 cpp_opts
->dollars_in_ident
= false;
601 error ("output filename specified twice");
604 case OPT_print_objc_runtime_info
:
605 print_struct_values
= 1;
613 case OPT_std_gnu__98
:
614 if (!preprocessing_asm_p
)
615 set_std_cxx98 (code
== OPT_std_c__98
/* ISO */);
619 case OPT_std_gnu__11
:
620 if (!preprocessing_asm_p
)
621 set_std_cxx11 (code
== OPT_std_c__11
/* ISO */);
625 case OPT_std_gnu__14
:
626 if (!preprocessing_asm_p
)
627 set_std_cxx14 (code
== OPT_std_c__14
/* ISO */);
631 case OPT_std_gnu__17
:
632 if (!preprocessing_asm_p
)
633 set_std_cxx17 (code
== OPT_std_c__17
/* ISO */);
637 case OPT_std_gnu__2a
:
638 if (!preprocessing_asm_p
)
639 set_std_cxx2a (code
== OPT_std_c__2a
/* ISO */);
643 case OPT_std_iso9899_199409
:
644 if (!preprocessing_asm_p
)
645 set_std_c89 (code
== OPT_std_iso9899_199409
/* c94 */, true /* ISO */);
649 if (!preprocessing_asm_p
)
650 set_std_c89 (false /* c94 */, false /* ISO */);
654 if (!preprocessing_asm_p
)
655 set_std_c99 (true /* ISO */);
659 if (!preprocessing_asm_p
)
660 set_std_c99 (false /* ISO */);
664 if (!preprocessing_asm_p
)
665 set_std_c11 (true /* ISO */);
669 if (!preprocessing_asm_p
)
670 set_std_c11 (false /* ISO */);
674 if (!preprocessing_asm_p
)
675 set_std_c17 (true /* ISO */);
679 if (!preprocessing_asm_p
)
680 set_std_c17 (false /* ISO */);
684 if (!preprocessing_asm_p
)
685 set_std_c2x (true /* ISO */);
689 if (!preprocessing_asm_p
)
690 set_std_c2x (false /* ISO */);
694 cpp_opts
->trigraphs
= 1;
697 case OPT_traditional_cpp
:
698 cpp_opts
->traditional
= 1;
709 C_handle_option_auto (&global_options
, &global_options_set
,
711 c_family_lang_mask
, kind
,
712 loc
, handlers
, global_dc
);
716 ObjC_handle_option_auto (&global_options
, &global_options_set
,
718 c_family_lang_mask
, kind
,
719 loc
, handlers
, global_dc
);
723 CXX_handle_option_auto (&global_options
, &global_options_set
,
725 c_family_lang_mask
, kind
,
726 loc
, handlers
, global_dc
);
730 ObjCXX_handle_option_auto (&global_options
, &global_options_set
,
732 c_family_lang_mask
, kind
,
733 loc
, handlers
, global_dc
);
740 cpp_handle_option_auto (&global_options
, scode
, cpp_opts
);
744 /* Default implementation of TARGET_HANDLE_C_OPTION. */
747 default_handle_c_option (size_t code ATTRIBUTE_UNUSED
,
748 const char *arg ATTRIBUTE_UNUSED
,
749 int value ATTRIBUTE_UNUSED
)
754 /* Post-switch processing. */
756 c_common_post_options (const char **pfilename
)
758 struct cpp_callbacks
*cb
;
760 /* Canonicalize the input and output filenames. */
761 if (in_fnames
== NULL
)
763 in_fnames
= XNEWVEC (const char *, 1);
766 else if (strcmp (in_fnames
[0], "-") == 0)
769 error ("cannot use %<-%> as input filename for a precompiled header");
774 if (out_fname
== NULL
|| !strcmp (out_fname
, "-"))
777 if (cpp_opts
->deps
.style
== DEPS_NONE
)
778 check_deps_environment_vars ();
780 handle_deferred_opts ();
782 sanitize_cpp_opts ();
784 register_include_chains (parse_in
, sysroot
, iprefix
, imultilib
,
785 std_inc
, std_cxx_inc
&& c_dialect_cxx (), verbose
);
787 #ifdef C_COMMON_OVERRIDE_OPTIONS
788 /* Some machines may reject certain combinations of C
789 language-specific options. */
790 C_COMMON_OVERRIDE_OPTIONS
;
793 /* Excess precision other than "fast" requires front-end
795 if (c_dialect_cxx ())
797 if (flag_excess_precision_cmdline
== EXCESS_PRECISION_STANDARD
)
798 sorry ("-fexcess-precision=standard for C++");
799 flag_excess_precision_cmdline
= EXCESS_PRECISION_FAST
;
801 else if (flag_excess_precision_cmdline
== EXCESS_PRECISION_DEFAULT
)
802 flag_excess_precision_cmdline
= (flag_iso
803 ? EXCESS_PRECISION_STANDARD
804 : EXCESS_PRECISION_FAST
);
806 /* ISO C restricts floating-point expression contraction to within
807 source-language expressions (-ffp-contract=on, currently an alias
808 for -ffp-contract=off). */
811 && (global_options_set
.x_flag_fp_contract_mode
812 == (enum fp_contract_mode
) 0)
813 && flag_unsafe_math_optimizations
== 0)
814 flag_fp_contract_mode
= FP_CONTRACT_OFF
;
816 /* If we are compiling C, and we are outside of a standards mode,
817 we can permit the new values from ISO/IEC TS 18661-3 for
818 FLT_EVAL_METHOD. Otherwise, we must restrict the possible values to
819 the set specified in ISO C99/C11. */
822 && (global_options_set
.x_flag_permitted_flt_eval_methods
823 == PERMITTED_FLT_EVAL_METHODS_DEFAULT
))
824 flag_permitted_flt_eval_methods
= PERMITTED_FLT_EVAL_METHODS_TS_18661
;
826 flag_permitted_flt_eval_methods
= PERMITTED_FLT_EVAL_METHODS_C11
;
828 /* By default we use C99 inline semantics in GNU99 or C99 mode. C99
829 inline semantics are not supported in GNU89 or C89 mode. */
830 if (flag_gnu89_inline
== -1)
831 flag_gnu89_inline
= !flag_isoc99
;
832 else if (!flag_gnu89_inline
&& !flag_isoc99
)
833 error ("-fno-gnu89-inline is only supported in GNU99 or C99 mode");
835 /* Default to ObjC sjlj exception handling if NeXT runtime. */
836 if (flag_objc_sjlj_exceptions
< 0)
837 flag_objc_sjlj_exceptions
= flag_next_runtime
;
838 if (flag_objc_exceptions
&& !flag_objc_sjlj_exceptions
)
841 /* If -ffreestanding, -fno-hosted or -fno-builtin then disable
842 pattern recognition. */
843 if (!global_options_set
.x_flag_tree_loop_distribute_patterns
845 flag_tree_loop_distribute_patterns
= 0;
847 /* -Woverlength-strings is off by default, but is enabled by -Wpedantic.
848 It is never enabled in C++, as the minimum limit is not normative
850 if (c_dialect_cxx ())
851 warn_overlength_strings
= 0;
853 /* Wmain is enabled by default in C++ but not in C. */
854 /* Wmain is disabled by default for -ffreestanding (!flag_hosted),
855 even if -Wall or -Wpedantic was given (warn_main will be 2 if set
856 by -Wall, 1 if set by -Wmain). */
858 warn_main
= (c_dialect_cxx () && flag_hosted
) ? 1 : 0;
859 else if (warn_main
== 2)
860 warn_main
= flag_hosted
? 1 : 0;
862 /* In C, -Wall and -Wc++-compat enable -Wenum-compare; if it has not
863 yet been set, it is disabled by default. In C++, it is enabled
865 if (warn_enum_compare
== -1)
866 warn_enum_compare
= c_dialect_cxx () ? 1 : 0;
868 /* -Wpacked-bitfield-compat is on by default for the C languages. The
869 warning is issued in stor-layout.c which is not part of the front-end so
870 we need to selectively turn it on here. */
871 if (warn_packed_bitfield_compat
== -1)
872 warn_packed_bitfield_compat
= 1;
874 /* Special format checking options don't work without -Wformat; warn if
878 warning (OPT_Wformat_y2k
,
879 "-Wformat-y2k ignored without -Wformat");
880 warning (OPT_Wformat_extra_args
,
881 "-Wformat-extra-args ignored without -Wformat");
882 warning (OPT_Wformat_zero_length
,
883 "-Wformat-zero-length ignored without -Wformat");
884 warning (OPT_Wformat_nonliteral
,
885 "-Wformat-nonliteral ignored without -Wformat");
886 warning (OPT_Wformat_contains_nul
,
887 "-Wformat-contains-nul ignored without -Wformat");
888 warning (OPT_Wformat_security
,
889 "-Wformat-security ignored without -Wformat");
892 /* -Wimplicit-function-declaration is enabled by default for C99. */
893 if (warn_implicit_function_declaration
== -1)
894 warn_implicit_function_declaration
= flag_isoc99
;
896 /* -Wimplicit-int is enabled by default for C99. */
897 if (warn_implicit_int
== -1)
898 warn_implicit_int
= flag_isoc99
;
900 /* -Wshift-overflow is enabled by default in C99 and C++11 modes. */
901 if (warn_shift_overflow
== -1)
902 warn_shift_overflow
= cxx_dialect
>= cxx11
|| flag_isoc99
;
904 /* -Wshift-negative-value is enabled by -Wextra in C99 and C++11 modes. */
905 if (warn_shift_negative_value
== -1)
906 warn_shift_negative_value
= (extra_warnings
907 && (cxx_dialect
>= cxx11
|| flag_isoc99
));
909 /* -Wregister is enabled by default in C++17. */
910 if (!global_options_set
.x_warn_register
)
911 warn_register
= cxx_dialect
>= cxx17
;
913 /* Declone C++ 'structors if -Os. */
914 if (flag_declone_ctor_dtor
== -1)
915 flag_declone_ctor_dtor
= optimize_size
;
917 if (flag_abi_compat_version
== 1)
919 warning (0, "%<-fabi-compat-version=1%> is not supported, using =2");
920 flag_abi_compat_version
= 2;
923 /* Change flag_abi_version to be the actual current ABI level, for the
924 benefit of c_cpp_builtins, and to make comparison simpler. */
925 const int latest_abi_version
= 13;
926 /* Generate compatibility aliases for ABI v11 (7.1) by default. */
927 const int abi_compat_default
= 11;
929 #define clamp(X) if (X == 0 || X > latest_abi_version) X = latest_abi_version
930 clamp (flag_abi_version
);
931 clamp (warn_abi_version
);
932 clamp (flag_abi_compat_version
);
935 /* Default -Wabi= or -fabi-compat-version= from each other. */
936 if (warn_abi_version
== -1 && flag_abi_compat_version
!= -1)
937 warn_abi_version
= flag_abi_compat_version
;
938 else if (flag_abi_compat_version
== -1 && warn_abi_version
!= -1)
939 flag_abi_compat_version
= warn_abi_version
;
940 else if (warn_abi_version
== -1 && flag_abi_compat_version
== -1)
942 warn_abi_version
= latest_abi_version
;
943 if (flag_abi_version
== latest_abi_version
)
945 auto_diagnostic_group d
;
946 if (warning (OPT_Wabi
, "-Wabi won't warn about anything"))
948 inform (input_location
, "-Wabi warns about differences "
949 "from the most up-to-date ABI, which is also used "
951 inform (input_location
, "use e.g. -Wabi=11 to warn about "
952 "changes from GCC 7");
954 flag_abi_compat_version
= abi_compat_default
;
957 flag_abi_compat_version
= latest_abi_version
;
960 /* By default, enable the new inheriting constructor semantics along with ABI
961 11. New and old should coexist fine, but it is a change in what
962 artificial symbols are generated. */
963 if (!global_options_set
.x_flag_new_inheriting_ctors
)
964 flag_new_inheriting_ctors
= abi_version_at_least (11);
966 /* For GCC 7, only enable DR150 resolution by default if -std=c++17. */
967 if (!global_options_set
.x_flag_new_ttp
)
968 flag_new_ttp
= (cxx_dialect
>= cxx17
);
970 if (cxx_dialect
>= cxx11
)
972 /* If we're allowing C++0x constructs, don't warn about C++98
973 identifiers which are keywords in C++0x. */
974 warn_cxx11_compat
= 0;
975 cpp_opts
->cpp_warn_cxx11_compat
= 0;
977 if (warn_narrowing
== -1)
980 /* Unless -f{,no-}ext-numeric-literals has been used explicitly,
981 for -std=c++{11,14,17,2a} default to -fno-ext-numeric-literals. */
982 if (flag_iso
&& !global_options_set
.x_flag_ext_numeric_literals
)
983 cpp_opts
->ext_numeric_literals
= 0;
985 else if (warn_narrowing
== -1)
988 /* C++17 has stricter evaluation order requirements; let's use some of them
989 for earlier C++ as well, so chaining works as expected. */
991 && flag_strong_eval_order
== -1)
992 flag_strong_eval_order
= (cxx_dialect
>= cxx17
? 2 : 1);
994 /* Global sized deallocation is new in C++14. */
995 if (flag_sized_deallocation
== -1)
996 flag_sized_deallocation
= (cxx_dialect
>= cxx14
);
998 if (flag_extern_tls_init
)
1000 if (!TARGET_SUPPORTS_ALIASES
|| !SUPPORTS_WEAK
)
1002 /* Lazy TLS initialization for a variable in another TU requires
1003 alias and weak reference support. */
1004 if (flag_extern_tls_init
> 0)
1005 sorry ("external TLS initialization functions not supported "
1008 flag_extern_tls_init
= 0;
1011 flag_extern_tls_init
= 1;
1014 /* Enable by default only for C++ and C++ with ObjC extensions. */
1015 if (warn_return_type
== -1 && c_dialect_cxx ())
1016 warn_return_type
= 1;
1018 if (num_in_fnames
> 1)
1019 error ("too many filenames given. Type %s --help for usage",
1022 if (flag_preprocess_only
)
1024 /* Open the output now. We must do so even if flag_no_output is
1025 on, because there may be other output than from the actual
1026 preprocessing (e.g. from -dM). */
1027 if (out_fname
[0] == '\0')
1028 out_stream
= stdout
;
1030 out_stream
= fopen (out_fname
, "w");
1032 if (out_stream
== NULL
)
1034 fatal_error (input_location
, "opening output file %s: %m", out_fname
);
1038 init_pp_output (out_stream
);
1044 /* When writing a PCH file, avoid reading some other PCH file,
1045 because the default address space slot then can't be used
1046 for the output PCH file. */
1049 c_common_no_more_pch ();
1050 /* Only -g0 and -gdwarf* are supported with PCH, for other
1051 debug formats we warn here and refuse to load any PCH files. */
1052 if (write_symbols
!= NO_DEBUG
&& write_symbols
!= DWARF2_DEBUG
)
1053 warning (OPT_Wdeprecated
,
1054 "the \"%s\" debug format cannot be used with "
1055 "pre-compiled headers", debug_type_names
[write_symbols
]);
1057 else if (write_symbols
!= NO_DEBUG
&& write_symbols
!= DWARF2_DEBUG
)
1058 c_common_no_more_pch ();
1060 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1061 input_location
= UNKNOWN_LOCATION
;
1064 cb
= cpp_get_callbacks (parse_in
);
1065 cb
->file_change
= cb_file_change
;
1066 cb
->dir_change
= cb_dir_change
;
1067 cpp_post_options (parse_in
);
1068 init_global_opts_from_cpp (&global_options
, cpp_get_options (parse_in
));
1070 input_location
= UNKNOWN_LOCATION
;
1072 *pfilename
= this_input_filename
1073 = cpp_read_main_file (parse_in
, in_fnames
[0]);
1074 /* Don't do any compilation or preprocessing if there is no input file. */
1075 if (this_input_filename
== NULL
)
1081 if (flag_working_directory
1082 && flag_preprocess_only
&& !flag_no_line_commands
)
1083 pp_dir_change (parse_in
, get_src_pwd ());
1085 /* Disable LTO output when outputting a precompiled header. */
1086 if (pch_file
&& flag_lto
)
1089 flag_generate_lto
= 0;
1092 return flag_preprocess_only
;
1095 /* Front end initialization common to C, ObjC and C++. */
1097 c_common_init (void)
1099 /* Set up preprocessor arithmetic. Must be done after call to
1100 c_common_nodes_and_builtins for type nodes to be good. */
1101 cpp_opts
->precision
= TYPE_PRECISION (intmax_type_node
);
1102 cpp_opts
->char_precision
= TYPE_PRECISION (char_type_node
);
1103 cpp_opts
->int_precision
= TYPE_PRECISION (integer_type_node
);
1104 cpp_opts
->wchar_precision
= TYPE_PRECISION (wchar_type_node
);
1105 cpp_opts
->unsigned_wchar
= TYPE_UNSIGNED (wchar_type_node
);
1106 cpp_opts
->bytes_big_endian
= BYTES_BIG_ENDIAN
;
1108 /* This can't happen until after wchar_precision and bytes_big_endian
1110 cpp_init_iconv (parse_in
);
1115 fputs ("Compiler executable checksum: ", stderr
);
1116 for (i
= 0; i
< 16; i
++)
1117 fprintf (stderr
, "%02x", executable_checksum
[i
]);
1118 putc ('\n', stderr
);
1121 /* Has to wait until now so that cpplib has its hash table. */
1124 if (flag_preprocess_only
)
1126 c_finish_options ();
1127 preprocess_file (parse_in
);
1134 /* Initialize the integrated preprocessor after debug output has been
1135 initialized; loop over each input file. */
1137 c_common_parse_file (void)
1144 c_finish_options ();
1145 /* Open the dump file to use for the original dump output
1146 here, to be used during parsing for the current file. */
1147 original_dump_file
= dump_begin (TDI_original
, &original_dump_flags
);
1152 /* And end the main input file, if the debug writer wants it */
1153 if (debug_hooks
->start_end_main_source_file
)
1154 (*debug_hooks
->end_source_file
) (0);
1155 if (++i
>= num_in_fnames
)
1157 cpp_undef_all (parse_in
);
1158 cpp_clear_file_cache (parse_in
);
1160 = cpp_read_main_file (parse_in
, in_fnames
[i
]);
1161 if (original_dump_file
)
1163 dump_end (TDI_original
, original_dump_file
);
1164 original_dump_file
= NULL
;
1166 /* If an input file is missing, abandon further compilation.
1167 cpplib has issued a diagnostic. */
1168 if (!this_input_filename
)
1172 c_parse_final_cleanups ();
1175 /* Returns the appropriate dump file for PHASE to dump with FLAGS. */
1178 get_dump_info (int phase
, dump_flags_t
*flags
)
1180 gcc_assert (phase
== TDI_original
);
1182 *flags
= original_dump_flags
;
1183 return original_dump_file
;
1186 /* Common finish hook for the C, ObjC and C++ front ends. */
1188 c_common_finish (void)
1190 FILE *deps_stream
= NULL
;
1192 /* Note that we write the dependencies even if there are errors. This is
1193 useful for handling outdated generated headers that now trigger errors
1194 (for example, with #error) which would be resolved by re-generating
1195 them. In a sense, this complements -MG. */
1196 if (cpp_opts
->deps
.style
!= DEPS_NONE
)
1198 /* If -M or -MM was seen without -MF, default output to the
1201 deps_stream
= out_stream
;
1202 else if (deps_file
[0] == '-' && deps_file
[1] == '\0')
1203 deps_stream
= stdout
;
1206 deps_stream
= fopen (deps_file
, deps_append
? "a": "w");
1208 fatal_error (input_location
, "opening dependency file %s: %m",
1213 /* For performance, avoid tearing down cpplib's internal structures
1214 with cpp_destroy (). */
1215 cpp_finish (parse_in
, deps_stream
);
1217 if (deps_stream
&& deps_stream
!= out_stream
&& deps_stream
!= stdout
1218 && (ferror (deps_stream
) || fclose (deps_stream
)))
1219 fatal_error (input_location
, "closing dependency file %s: %m", deps_file
);
1221 if (out_stream
&& (ferror (out_stream
) || fclose (out_stream
)))
1222 fatal_error (input_location
, "when writing output to %s: %m", out_fname
);
1225 /* Either of two environment variables can specify output of
1226 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1227 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1228 and DEPS_TARGET is the target to mention in the deps. They also
1229 result in dependency information being appended to the output file
1230 rather than overwriting it, and like Sun's compiler
1231 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1233 check_deps_environment_vars (void)
1237 spec
= getenv ("DEPENDENCIES_OUTPUT");
1239 cpp_opts
->deps
.style
= DEPS_USER
;
1242 spec
= getenv ("SUNPRO_DEPENDENCIES");
1245 cpp_opts
->deps
.style
= DEPS_SYSTEM
;
1246 cpp_opts
->deps
.ignore_main_file
= true;
1252 /* Find the space before the DEPS_TARGET, if there is one. */
1253 char *s
= strchr (spec
, ' ');
1256 /* Let the caller perform MAKE quoting. */
1257 defer_opt (OPT_MT
, s
+ 1);
1261 /* Command line -MF overrides environment variables and default. */
1270 /* Handle deferred command line switches. */
1272 handle_deferred_opts (void)
1277 /* Avoid allocating the deps buffer if we don't need it.
1278 (This flag may be true without there having been -MT or -MQ
1279 options, but we'll still need the deps buffer.) */
1283 deps
= cpp_get_deps (parse_in
);
1285 for (i
= 0; i
< deferred_count
; i
++)
1287 struct deferred_opt
*opt
= &deferred_opts
[i
];
1289 if (opt
->code
== OPT_MT
|| opt
->code
== OPT_MQ
)
1290 deps_add_target (deps
, opt
->arg
, opt
->code
== OPT_MQ
);
1294 /* These settings are appropriate for GCC, but not necessarily so for
1295 cpplib as a library. */
1297 sanitize_cpp_opts (void)
1299 /* If we don't know what style of dependencies to output, complain
1300 if any other dependency switches have been given. */
1301 if (deps_seen
&& cpp_opts
->deps
.style
== DEPS_NONE
)
1302 error ("to generate dependencies you must specify either -M or -MM");
1304 /* -dM and dependencies suppress normal output; do it here so that
1305 the last -d[MDN] switch overrides earlier ones. */
1306 if (flag_dump_macros
== 'M')
1309 /* By default, -fdirectives-only implies -dD. This allows subsequent phases
1310 to perform proper macro expansion. */
1311 if (cpp_opts
->directives_only
&& !cpp_opts
->preprocessed
&& !flag_dump_macros
)
1312 flag_dump_macros
= 'D';
1314 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1315 -dM since at least glibc relies on -M -dM to work. */
1316 /* Also, flag_no_output implies flag_no_line_commands, always. */
1319 if (flag_dump_macros
!= 'M')
1320 flag_dump_macros
= 0;
1321 flag_dump_includes
= 0;
1322 flag_no_line_commands
= 1;
1324 else if (cpp_opts
->deps
.missing_files
)
1325 error ("-MG may only be used with -M or -MM");
1327 cpp_opts
->unsigned_char
= !flag_signed_char
;
1328 cpp_opts
->stdc_0_in_system_headers
= STDC_0_IN_SYSTEM_HEADERS
;
1330 /* Wlong-long is disabled by default. It is enabled by:
1331 [-Wpedantic | -Wtraditional] -std=[gnu|c]++98 ; or
1332 [-Wpedantic | -Wtraditional] -std=non-c99
1334 Either -Wlong-long or -Wno-long-long override any other settings.
1335 ??? These conditions should be handled in c.opt. */
1336 if (warn_long_long
== -1)
1338 warn_long_long
= ((pedantic
|| warn_traditional
)
1339 && (c_dialect_cxx () ? cxx_dialect
== cxx98
: !flag_isoc99
));
1340 cpp_opts
->cpp_warn_long_long
= warn_long_long
;
1343 /* If we're generating preprocessor output, emit current directory
1344 if explicitly requested or if debugging information is enabled.
1345 ??? Maybe we should only do it for debugging formats that
1346 actually output the current directory? */
1347 if (flag_working_directory
== -1)
1348 flag_working_directory
= (debug_info_level
!= DINFO_LEVEL_NONE
);
1350 if (warn_implicit_fallthrough
< 5)
1351 cpp_opts
->cpp_warn_implicit_fallthrough
= warn_implicit_fallthrough
;
1353 cpp_opts
->cpp_warn_implicit_fallthrough
= 0;
1355 if (cpp_opts
->directives_only
)
1357 if (cpp_warn_unused_macros
)
1358 error ("-fdirectives-only is incompatible with -Wunused_macros");
1359 if (cpp_opts
->traditional
)
1360 error ("-fdirectives-only is incompatible with -traditional");
1364 /* Add include path with a prefix at the front of its name. */
1366 add_prefixed_path (const char *suffix
, incpath_kind chain
)
1370 size_t prefix_len
, suffix_len
;
1372 suffix_len
= strlen (suffix
);
1373 prefix
= iprefix
? iprefix
: cpp_GCC_INCLUDE_DIR
;
1374 prefix_len
= iprefix
? strlen (iprefix
) : cpp_GCC_INCLUDE_DIR_len
;
1376 path
= (char *) xmalloc (prefix_len
+ suffix_len
+ 1);
1377 memcpy (path
, prefix
, prefix_len
);
1378 memcpy (path
+ prefix_len
, suffix
, suffix_len
);
1379 path
[prefix_len
+ suffix_len
] = '\0';
1381 add_path (path
, chain
, 0, false);
1384 /* Handle -D, -U, -A, -imacros, and the first -include. */
1386 c_finish_options (void)
1388 if (!cpp_opts
->preprocessed
)
1392 cb_file_change (parse_in
,
1393 linemap_check_ordinary (linemap_add (line_table
,
1397 /* Make sure all of the builtins about to be declared have
1398 BUILTINS_LOCATION has their source_location. */
1399 cpp_force_token_locations (parse_in
, BUILTINS_LOCATION
);
1401 cpp_init_builtins (parse_in
, flag_hosted
);
1402 c_cpp_builtins (parse_in
);
1404 cpp_stop_forcing_token_locations (parse_in
);
1406 /* We're about to send user input to cpplib, so make it warn for
1407 things that we previously (when we sent it internal definitions)
1408 told it to not warn.
1410 C99 permits implementation-defined characters in identifiers.
1411 The documented meaning of -std= is to turn off extensions that
1412 conflict with the specified standard, and since a strictly
1413 conforming program cannot contain a '$', we do not condition
1414 their acceptance on the -std= setting. */
1415 cpp_opts
->warn_dollars
= (cpp_opts
->cpp_pedantic
&& !cpp_opts
->c99
);
1417 cb_file_change (parse_in
,
1418 linemap_check_ordinary (linemap_add (line_table
, LC_RENAME
, 0,
1419 _("<command-line>"), 0)));
1421 for (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 /* Start the main input file, if the debug writer wants it. */
1439 if (debug_hooks
->start_end_main_source_file
1440 && !flag_preprocess_only
)
1441 (*debug_hooks
->start_source_file
) (0, this_input_filename
);
1443 /* Handle -imacros after -D and -U. */
1444 for (i
= 0; i
< deferred_count
; i
++)
1446 struct deferred_opt
*opt
= &deferred_opts
[i
];
1448 if (opt
->code
== OPT_imacros
1449 && cpp_push_include (parse_in
, opt
->arg
))
1451 /* Disable push_command_line_include callback for now. */
1452 include_cursor
= deferred_count
+ 1;
1453 cpp_scan_nooutput (parse_in
);
1459 if (cpp_opts
->directives_only
)
1460 cpp_init_special_builtins (parse_in
);
1462 /* Start the main input file, if the debug writer wants it. */
1463 if (debug_hooks
->start_end_main_source_file
1464 && !flag_preprocess_only
)
1465 (*debug_hooks
->start_source_file
) (0, this_input_filename
);
1469 push_command_line_include ();
1472 /* Give CPP the next file given by -include, if any. */
1474 push_command_line_include (void)
1476 /* This can happen if disabled by -imacros for example.
1477 Punt so that we don't set "<command-line>" as the filename for
1479 if (include_cursor
> deferred_count
)
1482 if (!done_preinclude
)
1484 done_preinclude
= true;
1485 if (flag_hosted
&& std_inc
&& !cpp_opts
->preprocessed
)
1487 const char *preinc
= targetcm
.c_preinclude ();
1488 if (preinc
&& cpp_push_default_include (parse_in
, preinc
))
1493 pch_cpp_save_state ();
1495 while (include_cursor
< deferred_count
)
1497 struct deferred_opt
*opt
= &deferred_opts
[include_cursor
++];
1499 if (!cpp_opts
->preprocessed
&& opt
->code
== OPT_include
1500 && cpp_push_include (parse_in
, opt
->arg
))
1504 if (include_cursor
== deferred_count
)
1507 /* -Wunused-macros should only warn about macros defined hereafter. */
1508 cpp_opts
->warn_unused_macros
= cpp_warn_unused_macros
;
1509 /* Restore the line map from <command line>. */
1510 if (!cpp_opts
->preprocessed
)
1511 cpp_change_file (parse_in
, LC_RENAME
, this_input_filename
);
1513 /* Set this here so the client can change the option if it wishes,
1514 and after stacking the main file so we don't trace the main file. */
1515 line_table
->trace_includes
= cpp_opts
->print_include_names
;
1519 /* File change callback. Has to handle -include files. */
1521 cb_file_change (cpp_reader
* ARG_UNUSED (pfile
),
1522 const line_map_ordinary
*new_map
)
1524 if (flag_preprocess_only
)
1525 pp_file_change (new_map
);
1527 fe_file_change (new_map
);
1530 && (new_map
->reason
== LC_ENTER
|| new_map
->reason
== LC_RENAME
))
1532 /* Signal to plugins that a file is included. This could happen
1533 several times with the same file path, e.g. because of
1534 several '#include' or '#line' directives... */
1535 invoke_plugin_callbacks
1536 (PLUGIN_INCLUDE_FILE
,
1537 const_cast<char*> (ORDINARY_MAP_FILE_NAME (new_map
)));
1540 if (new_map
== 0 || (new_map
->reason
== LC_LEAVE
&& MAIN_FILE_P (new_map
)))
1542 pch_cpp_save_state ();
1543 push_command_line_include ();
1548 cb_dir_change (cpp_reader
* ARG_UNUSED (pfile
), const char *dir
)
1550 if (!set_src_pwd (dir
))
1551 warning (0, "too late for # directive to set debug directory");
1554 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1555 extensions if ISO). There is no concept of gnu94. */
1557 set_std_c89 (int c94
, int iso
)
1559 cpp_set_lang (parse_in
, c94
? CLK_STDC94
: iso
? CLK_STDC89
: CLK_GNUC89
);
1562 flag_no_gnu_keywords
= iso
;
1563 flag_no_nonansi_builtin
= iso
;
1568 lang_hooks
.name
= "GNU C89";
1571 /* Set the C 99 standard (without GNU extensions if ISO). */
1573 set_std_c99 (int iso
)
1575 cpp_set_lang (parse_in
, iso
? CLK_STDC99
: CLK_GNUC99
);
1577 flag_no_nonansi_builtin
= iso
;
1583 lang_hooks
.name
= "GNU C99";
1586 /* Set the C 11 standard (without GNU extensions if ISO). */
1588 set_std_c11 (int iso
)
1590 cpp_set_lang (parse_in
, iso
? CLK_STDC11
: CLK_GNUC11
);
1592 flag_no_nonansi_builtin
= iso
;
1598 lang_hooks
.name
= "GNU C11";
1601 /* Set the C 17 standard (without GNU extensions if ISO). */
1603 set_std_c17 (int iso
)
1605 cpp_set_lang (parse_in
, iso
? CLK_STDC17
: CLK_GNUC17
);
1607 flag_no_nonansi_builtin
= iso
;
1613 lang_hooks
.name
= "GNU C17";
1616 /* Set the C 2X standard (without GNU extensions if ISO). */
1618 set_std_c2x (int iso
)
1620 cpp_set_lang (parse_in
, iso
? CLK_STDC2X
: CLK_GNUC2X
);
1622 flag_no_nonansi_builtin
= iso
;
1628 lang_hooks
.name
= "GNU C2X";
1632 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1634 set_std_cxx98 (int iso
)
1636 cpp_set_lang (parse_in
, iso
? CLK_CXX98
: CLK_GNUCXX
);
1637 flag_no_gnu_keywords
= iso
;
1638 flag_no_nonansi_builtin
= iso
;
1642 cxx_dialect
= cxx98
;
1643 lang_hooks
.name
= "GNU C++98";
1646 /* Set the C++ 2011 standard (without GNU extensions if ISO). */
1648 set_std_cxx11 (int iso
)
1650 cpp_set_lang (parse_in
, iso
? CLK_CXX11
: CLK_GNUCXX11
);
1651 flag_no_gnu_keywords
= iso
;
1652 flag_no_nonansi_builtin
= iso
;
1654 /* C++11 includes the C99 standard library. */
1657 cxx_dialect
= cxx11
;
1658 lang_hooks
.name
= "GNU C++11";
1661 /* Set the C++ 2014 standard (without GNU extensions if ISO). */
1663 set_std_cxx14 (int iso
)
1665 cpp_set_lang (parse_in
, iso
? CLK_CXX14
: CLK_GNUCXX14
);
1666 flag_no_gnu_keywords
= iso
;
1667 flag_no_nonansi_builtin
= iso
;
1669 /* C++14 includes the C99 standard library. */
1672 cxx_dialect
= cxx14
;
1673 lang_hooks
.name
= "GNU C++14";
1676 /* Set the C++ 2017 standard (without GNU extensions if ISO). */
1678 set_std_cxx17 (int iso
)
1680 cpp_set_lang (parse_in
, iso
? CLK_CXX17
: CLK_GNUCXX17
);
1681 flag_no_gnu_keywords
= iso
;
1682 flag_no_nonansi_builtin
= iso
;
1684 /* C++17 includes the C11 standard library. */
1688 cxx_dialect
= cxx17
;
1689 lang_hooks
.name
= "GNU C++17";
1692 /* Set the C++ 202a draft standard (without GNU extensions if ISO). */
1694 set_std_cxx2a (int iso
)
1696 cpp_set_lang (parse_in
, iso
? CLK_CXX2A
: CLK_GNUCXX2A
);
1697 flag_no_gnu_keywords
= iso
;
1698 flag_no_nonansi_builtin
= iso
;
1700 /* C++17 includes the C11 standard library. */
1704 cxx_dialect
= cxx2a
;
1705 lang_hooks
.name
= "GNU C++17"; /* Pretend C++17 until standardization. */
1708 /* Args to -d specify what to dump. Silently ignore
1709 unrecognized options; they may be aimed at toplev.c. */
1711 handle_OPT_d (const char *arg
)
1715 while ((c
= *arg
++) != '\0')
1718 case 'M': /* Dump macros only. */
1719 case 'N': /* Dump names. */
1720 case 'D': /* Dump definitions. */
1721 case 'U': /* Dump used macros. */
1722 flag_dump_macros
= c
;
1726 flag_dump_includes
= 1;