1 /* C/ObjC/C++ command line option handling.
2 Copyright (C) 2002-2019 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, "
331 "please use %<-iquote%> instead");
337 /* When doing dependencies with -M or -MM, suppress normal
338 preprocessed output, but still do -dM etc. as software
339 depends on this. Preprocessed output does occur if -MD, -MMD
340 or environment var dependency generation is used. */
341 cpp_opts
->deps
.style
= (code
== OPT_M
? DEPS_SYSTEM
: DEPS_USER
);
347 cpp_opts
->deps
.style
= (code
== OPT_MD
? DEPS_SYSTEM
: DEPS_USER
);
348 cpp_opts
->deps
.need_preprocessor_output
= true;
359 cpp_opts
->deps
.missing_files
= true;
364 cpp_opts
->deps
.phony_targets
= true;
370 defer_opt (code
, arg
);
374 flag_no_line_commands
= 1;
378 defer_opt (code
, arg
);
382 /* ??? Don't add new options here. Use LangEnabledBy in c.opt. */
384 cpp_opts
->warn_num_sign_change
= value
;
387 case OPT_Wunknown_pragmas
:
388 /* Set to greater than 1, so that even unknown pragmas in
389 system headers will be warned about. */
390 /* ??? There is no way to handle this automatically for now. */
391 warn_unknown_pragmas
= value
* 2;
395 if (!c_dialect_cxx ())
396 set_std_c89 (false, true);
398 set_std_cxx98 (true);
409 warning (0, "%<-Wabi=1%> is not supported, using =2");
412 warn_abi_version
= value
;
415 case OPT_fcanonical_system_headers
:
416 cpp_opts
->canonical_system_headers
= value
;
419 case OPT_fcond_mismatch
:
420 if (!c_dialect_cxx ())
422 flag_cond_mismatch
= value
;
425 warning (0, "switch %qs is no longer supported", option
->opt_text
);
432 disable_builtin_function (arg
);
435 case OPT_fdirectives_only
:
436 cpp_opts
->directives_only
= value
;
439 case OPT_fdollars_in_identifiers
:
440 cpp_opts
->dollars_in_ident
= value
;
443 case OPT_fmacro_prefix_map_
:
444 add_macro_prefix_map (arg
);
447 case OPT_ffreestanding
:
452 flag_no_builtin
= !value
;
455 case OPT_fconstant_string_class_
:
456 constant_string_class_name
= arg
;
459 case OPT_fextended_identifiers
:
460 cpp_opts
->extended_identifiers
= value
;
463 case OPT_foperator_names
:
464 cpp_opts
->operator_names
= value
;
468 cpp_opts
->restore_pch_deps
= value
;
471 case OPT_fpch_preprocess
:
472 flag_pch_preprocess
= value
;
475 case OPT_fpermissive
:
476 flag_permissive
= value
;
477 global_dc
->permissive
= value
;
480 case OPT_fpreprocessed
:
481 cpp_opts
->preprocessed
= value
;
488 case OPT_ftrack_macro_expansion
:
493 case OPT_ftrack_macro_expansion_
:
494 if (arg
&& *arg
!= '\0')
495 cpp_opts
->track_macro_expansion
= value
;
497 cpp_opts
->track_macro_expansion
= 2;
501 flag_use_repository
= value
;
503 flag_implicit_templates
= 0;
507 /* It is documented that we silently ignore silly values. */
508 if (value
>= 1 && value
<= 100)
509 cpp_opts
->tabstop
= value
;
512 case OPT_fexec_charset_
:
513 cpp_opts
->narrow_charset
= arg
;
516 case OPT_fwide_exec_charset_
:
517 cpp_opts
->wide_charset
= arg
;
520 case OPT_finput_charset_
:
521 cpp_opts
->input_charset
= arg
;
524 case OPT_ftemplate_depth_
:
525 max_tinst_depth
= value
;
528 case OPT_fvisibility_inlines_hidden
:
529 visibility_options
.inlines_hidden
= value
;
532 case OPT_femit_struct_debug_baseonly
:
533 set_struct_debug_option (&global_options
, loc
, "base");
536 case OPT_femit_struct_debug_reduced
:
537 set_struct_debug_option (&global_options
, loc
,
538 "dir:ord:sys,dir:gen:any,ind:base");
541 case OPT_femit_struct_debug_detailed_
:
542 set_struct_debug_option (&global_options
, loc
, arg
);
545 case OPT_fext_numeric_literals
:
546 cpp_opts
->ext_numeric_literals
= value
;
550 add_path (xstrdup (arg
), INC_AFTER
, 0, true);
555 defer_opt (code
, arg
);
567 add_path (xstrdup (arg
), INC_QUOTE
, 0, true);
575 add_path (xstrdup (arg
), INC_SYSTEM
, 0, true);
578 case OPT_iwithprefix
:
579 add_prefixed_path (arg
, INC_SYSTEM
);
582 case OPT_iwithprefixbefore
:
583 add_prefixed_path (arg
, INC_BRACKET
);
587 cpp_set_lang (parse_in
, CLK_ASM
);
588 cpp_opts
->dollars_in_ident
= false;
603 error ("output filename specified twice");
606 case OPT_print_objc_runtime_info
:
607 print_struct_values
= 1;
615 case OPT_std_gnu__98
:
616 if (!preprocessing_asm_p
)
617 set_std_cxx98 (code
== OPT_std_c__98
/* ISO */);
621 case OPT_std_gnu__11
:
622 if (!preprocessing_asm_p
)
623 set_std_cxx11 (code
== OPT_std_c__11
/* ISO */);
627 case OPT_std_gnu__14
:
628 if (!preprocessing_asm_p
)
629 set_std_cxx14 (code
== OPT_std_c__14
/* ISO */);
633 case OPT_std_gnu__17
:
634 if (!preprocessing_asm_p
)
635 set_std_cxx17 (code
== OPT_std_c__17
/* ISO */);
639 case OPT_std_gnu__2a
:
640 if (!preprocessing_asm_p
)
641 set_std_cxx2a (code
== OPT_std_c__2a
/* ISO */);
645 case OPT_std_iso9899_199409
:
646 if (!preprocessing_asm_p
)
647 set_std_c89 (code
== OPT_std_iso9899_199409
/* c94 */, true /* ISO */);
651 if (!preprocessing_asm_p
)
652 set_std_c89 (false /* c94 */, false /* ISO */);
656 if (!preprocessing_asm_p
)
657 set_std_c99 (true /* ISO */);
661 if (!preprocessing_asm_p
)
662 set_std_c99 (false /* ISO */);
666 if (!preprocessing_asm_p
)
667 set_std_c11 (true /* ISO */);
671 if (!preprocessing_asm_p
)
672 set_std_c11 (false /* ISO */);
676 if (!preprocessing_asm_p
)
677 set_std_c17 (true /* ISO */);
681 if (!preprocessing_asm_p
)
682 set_std_c17 (false /* ISO */);
686 if (!preprocessing_asm_p
)
687 set_std_c2x (true /* ISO */);
691 if (!preprocessing_asm_p
)
692 set_std_c2x (false /* ISO */);
696 cpp_opts
->trigraphs
= 1;
699 case OPT_traditional_cpp
:
700 cpp_opts
->traditional
= 1;
711 C_handle_option_auto (&global_options
, &global_options_set
,
713 c_family_lang_mask
, kind
,
714 loc
, handlers
, global_dc
);
718 ObjC_handle_option_auto (&global_options
, &global_options_set
,
720 c_family_lang_mask
, kind
,
721 loc
, handlers
, global_dc
);
725 CXX_handle_option_auto (&global_options
, &global_options_set
,
727 c_family_lang_mask
, kind
,
728 loc
, handlers
, global_dc
);
732 ObjCXX_handle_option_auto (&global_options
, &global_options_set
,
734 c_family_lang_mask
, kind
,
735 loc
, handlers
, global_dc
);
742 cpp_handle_option_auto (&global_options
, scode
, cpp_opts
);
746 /* Default implementation of TARGET_HANDLE_C_OPTION. */
749 default_handle_c_option (size_t code ATTRIBUTE_UNUSED
,
750 const char *arg ATTRIBUTE_UNUSED
,
751 int value ATTRIBUTE_UNUSED
)
756 /* Post-switch processing. */
758 c_common_post_options (const char **pfilename
)
760 struct cpp_callbacks
*cb
;
762 /* Canonicalize the input and output filenames. */
763 if (in_fnames
== NULL
)
765 in_fnames
= XNEWVEC (const char *, 1);
768 else if (strcmp (in_fnames
[0], "-") == 0)
771 error ("cannot use %<-%> as input filename for a precompiled header");
776 if (out_fname
== NULL
|| !strcmp (out_fname
, "-"))
779 if (cpp_opts
->deps
.style
== DEPS_NONE
)
780 check_deps_environment_vars ();
782 handle_deferred_opts ();
784 sanitize_cpp_opts ();
786 register_include_chains (parse_in
, sysroot
, iprefix
, imultilib
,
787 std_inc
, std_cxx_inc
&& c_dialect_cxx (), verbose
);
789 #ifdef C_COMMON_OVERRIDE_OPTIONS
790 /* Some machines may reject certain combinations of C
791 language-specific options. */
792 C_COMMON_OVERRIDE_OPTIONS
;
795 /* Excess precision other than "fast" requires front-end
797 if (c_dialect_cxx ())
799 if (flag_excess_precision_cmdline
== EXCESS_PRECISION_STANDARD
)
800 sorry ("%<-fexcess-precision=standard%> for C++");
801 flag_excess_precision_cmdline
= EXCESS_PRECISION_FAST
;
803 else if (flag_excess_precision_cmdline
== EXCESS_PRECISION_DEFAULT
)
804 flag_excess_precision_cmdline
= (flag_iso
805 ? EXCESS_PRECISION_STANDARD
806 : EXCESS_PRECISION_FAST
);
808 /* ISO C restricts floating-point expression contraction to within
809 source-language expressions (-ffp-contract=on, currently an alias
810 for -ffp-contract=off). */
813 && (global_options_set
.x_flag_fp_contract_mode
814 == (enum fp_contract_mode
) 0)
815 && flag_unsafe_math_optimizations
== 0)
816 flag_fp_contract_mode
= FP_CONTRACT_OFF
;
818 /* If we are compiling C, and we are outside of a standards mode,
819 we can permit the new values from ISO/IEC TS 18661-3 for
820 FLT_EVAL_METHOD. Otherwise, we must restrict the possible values to
821 the set specified in ISO C99/C11. */
824 && (global_options_set
.x_flag_permitted_flt_eval_methods
825 == PERMITTED_FLT_EVAL_METHODS_DEFAULT
))
826 flag_permitted_flt_eval_methods
= PERMITTED_FLT_EVAL_METHODS_TS_18661
;
828 flag_permitted_flt_eval_methods
= PERMITTED_FLT_EVAL_METHODS_C11
;
830 /* By default we use C99 inline semantics in GNU99 or C99 mode. C99
831 inline semantics are not supported in GNU89 or C89 mode. */
832 if (flag_gnu89_inline
== -1)
833 flag_gnu89_inline
= !flag_isoc99
;
834 else if (!flag_gnu89_inline
&& !flag_isoc99
)
835 error ("%<-fno-gnu89-inline%> is only supported in GNU99 or C99 mode");
837 /* Default to ObjC sjlj exception handling if NeXT runtime. */
838 if (flag_objc_sjlj_exceptions
< 0)
839 flag_objc_sjlj_exceptions
= flag_next_runtime
;
840 if (flag_objc_exceptions
&& !flag_objc_sjlj_exceptions
)
843 /* If -ffreestanding, -fno-hosted or -fno-builtin then disable
844 pattern recognition. */
845 if (!global_options_set
.x_flag_tree_loop_distribute_patterns
847 flag_tree_loop_distribute_patterns
= 0;
849 /* -Woverlength-strings is off by default, but is enabled by -Wpedantic.
850 It is never enabled in C++, as the minimum limit is not normative
852 if (c_dialect_cxx ())
853 warn_overlength_strings
= 0;
855 /* Wmain is enabled by default in C++ but not in C. */
856 /* Wmain is disabled by default for -ffreestanding (!flag_hosted),
857 even if -Wall or -Wpedantic was given (warn_main will be 2 if set
858 by -Wall, 1 if set by -Wmain). */
860 warn_main
= (c_dialect_cxx () && flag_hosted
) ? 1 : 0;
861 else if (warn_main
== 2)
862 warn_main
= flag_hosted
? 1 : 0;
864 /* In C, -Wall and -Wc++-compat enable -Wenum-compare; if it has not
865 yet been set, it is disabled by default. In C++, it is enabled
867 if (warn_enum_compare
== -1)
868 warn_enum_compare
= c_dialect_cxx () ? 1 : 0;
870 /* -Wpacked-bitfield-compat is on by default for the C languages. The
871 warning is issued in stor-layout.c which is not part of the front-end so
872 we need to selectively turn it on here. */
873 if (warn_packed_bitfield_compat
== -1)
874 warn_packed_bitfield_compat
= 1;
876 /* Special format checking options don't work without -Wformat; warn if
880 warning (OPT_Wformat_y2k
,
881 "%<-Wformat-y2k%> ignored without %<-Wformat%>");
882 warning (OPT_Wformat_extra_args
,
883 "%<-Wformat-extra-args%> ignored without %<-Wformat%>");
884 warning (OPT_Wformat_zero_length
,
885 "%<-Wformat-zero-length%> ignored without %<-Wformat%>");
886 warning (OPT_Wformat_nonliteral
,
887 "%<-Wformat-nonliteral%> ignored without %<-Wformat%>");
888 warning (OPT_Wformat_contains_nul
,
889 "%<-Wformat-contains-nul%> ignored without %<-Wformat%>");
890 warning (OPT_Wformat_security
,
891 "%<-Wformat-security%> ignored without %<-Wformat%>");
894 /* -Wimplicit-function-declaration is enabled by default for C99. */
895 if (warn_implicit_function_declaration
== -1)
896 warn_implicit_function_declaration
= flag_isoc99
;
898 /* -Wimplicit-int is enabled by default for C99. */
899 if (warn_implicit_int
== -1)
900 warn_implicit_int
= flag_isoc99
;
902 /* -Wshift-overflow is enabled by default in C99 and C++11 modes. */
903 if (warn_shift_overflow
== -1)
904 warn_shift_overflow
= cxx_dialect
>= cxx11
|| flag_isoc99
;
906 /* -Wshift-negative-value is enabled by -Wextra in C99 and C++11 modes. */
907 if (warn_shift_negative_value
== -1)
908 warn_shift_negative_value
= (extra_warnings
909 && (cxx_dialect
>= cxx11
|| flag_isoc99
));
911 /* -Wregister is enabled by default in C++17. */
912 if (!global_options_set
.x_warn_register
)
913 warn_register
= cxx_dialect
>= cxx17
;
915 /* Declone C++ 'structors if -Os. */
916 if (flag_declone_ctor_dtor
== -1)
917 flag_declone_ctor_dtor
= optimize_size
;
919 if (flag_abi_compat_version
== 1)
921 warning (0, "%<-fabi-compat-version=1%> is not supported, using =2");
922 flag_abi_compat_version
= 2;
925 /* Change flag_abi_version to be the actual current ABI level, for the
926 benefit of c_cpp_builtins, and to make comparison simpler. */
927 const int latest_abi_version
= 13;
928 /* Generate compatibility aliases for ABI v11 (7.1) by default. */
929 const int abi_compat_default
= 11;
931 #define clamp(X) if (X == 0 || X > latest_abi_version) X = latest_abi_version
932 clamp (flag_abi_version
);
933 clamp (warn_abi_version
);
934 clamp (flag_abi_compat_version
);
937 /* Default -Wabi= or -fabi-compat-version= from each other. */
938 if (warn_abi_version
== -1 && flag_abi_compat_version
!= -1)
939 warn_abi_version
= flag_abi_compat_version
;
940 else if (flag_abi_compat_version
== -1 && warn_abi_version
!= -1)
941 flag_abi_compat_version
= warn_abi_version
;
942 else if (warn_abi_version
== -1 && flag_abi_compat_version
== -1)
944 warn_abi_version
= latest_abi_version
;
945 if (flag_abi_version
== latest_abi_version
)
947 auto_diagnostic_group d
;
948 if (warning (OPT_Wabi
, "%<-Wabi%> won%'t warn about anything"))
950 inform (input_location
, "%<-Wabi%> warns about differences "
951 "from the most up-to-date ABI, which is also used "
953 inform (input_location
, "use e.g. %<-Wabi=11%> to warn about "
954 "changes from GCC 7");
956 flag_abi_compat_version
= abi_compat_default
;
959 flag_abi_compat_version
= latest_abi_version
;
962 /* By default, enable the new inheriting constructor semantics along with ABI
963 11. New and old should coexist fine, but it is a change in what
964 artificial symbols are generated. */
965 if (!global_options_set
.x_flag_new_inheriting_ctors
)
966 flag_new_inheriting_ctors
= abi_version_at_least (11);
968 /* For GCC 7, only enable DR150 resolution by default if -std=c++17. */
969 if (!global_options_set
.x_flag_new_ttp
)
970 flag_new_ttp
= (cxx_dialect
>= cxx17
);
972 if (cxx_dialect
>= cxx11
)
974 /* If we're allowing C++0x constructs, don't warn about C++98
975 identifiers which are keywords in C++0x. */
976 warn_cxx11_compat
= 0;
977 cpp_opts
->cpp_warn_cxx11_compat
= 0;
979 if (warn_narrowing
== -1)
982 /* Unless -f{,no-}ext-numeric-literals has been used explicitly,
983 for -std=c++{11,14,17,2a} default to -fno-ext-numeric-literals. */
984 if (flag_iso
&& !global_options_set
.x_flag_ext_numeric_literals
)
985 cpp_opts
->ext_numeric_literals
= 0;
987 else if (warn_narrowing
== -1)
990 /* C++17 has stricter evaluation order requirements; let's use some of them
991 for earlier C++ as well, so chaining works as expected. */
993 && flag_strong_eval_order
== -1)
994 flag_strong_eval_order
= (cxx_dialect
>= cxx17
? 2 : 1);
996 /* Global sized deallocation is new in C++14. */
997 if (flag_sized_deallocation
== -1)
998 flag_sized_deallocation
= (cxx_dialect
>= cxx14
);
1000 /* char8_t support is new in C++2A. */
1001 if (flag_char8_t
== -1)
1002 flag_char8_t
= (cxx_dialect
>= cxx2a
);
1004 if (flag_extern_tls_init
)
1006 if (!TARGET_SUPPORTS_ALIASES
|| !SUPPORTS_WEAK
)
1008 /* Lazy TLS initialization for a variable in another TU requires
1009 alias and weak reference support. */
1010 if (flag_extern_tls_init
> 0)
1011 sorry ("external TLS initialization functions not supported "
1014 flag_extern_tls_init
= 0;
1017 flag_extern_tls_init
= 1;
1020 /* Enable by default only for C++ and C++ with ObjC extensions. */
1021 if (warn_return_type
== -1 && c_dialect_cxx ())
1022 warn_return_type
= 1;
1024 if (num_in_fnames
> 1)
1025 error ("too many filenames given. Type %s --help for usage",
1028 if (flag_preprocess_only
)
1030 /* Open the output now. We must do so even if flag_no_output is
1031 on, because there may be other output than from the actual
1032 preprocessing (e.g. from -dM). */
1033 if (out_fname
[0] == '\0')
1034 out_stream
= stdout
;
1036 out_stream
= fopen (out_fname
, "w");
1038 if (out_stream
== NULL
)
1040 fatal_error (input_location
, "opening output file %s: %m", out_fname
);
1044 init_pp_output (out_stream
);
1050 /* When writing a PCH file, avoid reading some other PCH file,
1051 because the default address space slot then can't be used
1052 for the output PCH file. */
1055 c_common_no_more_pch ();
1056 /* Only -g0 and -gdwarf* are supported with PCH, for other
1057 debug formats we warn here and refuse to load any PCH files. */
1058 if (write_symbols
!= NO_DEBUG
&& write_symbols
!= DWARF2_DEBUG
)
1059 warning (OPT_Wdeprecated
,
1060 "the \"%s\" debug format cannot be used with "
1061 "pre-compiled headers", debug_type_names
[write_symbols
]);
1063 else if (write_symbols
!= NO_DEBUG
&& write_symbols
!= DWARF2_DEBUG
)
1064 c_common_no_more_pch ();
1066 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1067 input_location
= UNKNOWN_LOCATION
;
1070 cb
= cpp_get_callbacks (parse_in
);
1071 cb
->file_change
= cb_file_change
;
1072 cb
->dir_change
= cb_dir_change
;
1073 cpp_post_options (parse_in
);
1074 init_global_opts_from_cpp (&global_options
, cpp_get_options (parse_in
));
1076 input_location
= UNKNOWN_LOCATION
;
1078 *pfilename
= this_input_filename
1079 = cpp_read_main_file (parse_in
, in_fnames
[0]);
1080 /* Don't do any compilation or preprocessing if there is no input file. */
1081 if (this_input_filename
== NULL
)
1087 if (flag_working_directory
1088 && flag_preprocess_only
&& !flag_no_line_commands
)
1089 pp_dir_change (parse_in
, get_src_pwd ());
1091 /* Disable LTO output when outputting a precompiled header. */
1092 if (pch_file
&& flag_lto
)
1095 flag_generate_lto
= 0;
1098 return flag_preprocess_only
;
1101 /* Front end initialization common to C, ObjC and C++. */
1103 c_common_init (void)
1105 /* Set up preprocessor arithmetic. Must be done after call to
1106 c_common_nodes_and_builtins for type nodes to be good. */
1107 cpp_opts
->precision
= TYPE_PRECISION (intmax_type_node
);
1108 cpp_opts
->char_precision
= TYPE_PRECISION (char_type_node
);
1109 cpp_opts
->int_precision
= TYPE_PRECISION (integer_type_node
);
1110 cpp_opts
->wchar_precision
= TYPE_PRECISION (wchar_type_node
);
1111 cpp_opts
->unsigned_wchar
= TYPE_UNSIGNED (wchar_type_node
);
1112 cpp_opts
->bytes_big_endian
= BYTES_BIG_ENDIAN
;
1114 /* This can't happen until after wchar_precision and bytes_big_endian
1116 cpp_init_iconv (parse_in
);
1121 fputs ("Compiler executable checksum: ", stderr
);
1122 for (i
= 0; i
< 16; i
++)
1123 fprintf (stderr
, "%02x", executable_checksum
[i
]);
1124 putc ('\n', stderr
);
1127 /* Has to wait until now so that cpplib has its hash table. */
1130 if (flag_preprocess_only
)
1132 c_finish_options ();
1133 preprocess_file (parse_in
);
1140 /* Initialize the integrated preprocessor after debug output has been
1141 initialized; loop over each input file. */
1143 c_common_parse_file (void)
1150 c_finish_options ();
1151 /* Open the dump file to use for the original dump output
1152 here, to be used during parsing for the current file. */
1153 original_dump_file
= dump_begin (TDI_original
, &original_dump_flags
);
1158 /* And end the main input file, if the debug writer wants it */
1159 if (debug_hooks
->start_end_main_source_file
)
1160 (*debug_hooks
->end_source_file
) (0);
1161 if (++i
>= num_in_fnames
)
1163 cpp_undef_all (parse_in
);
1164 cpp_clear_file_cache (parse_in
);
1166 = cpp_read_main_file (parse_in
, in_fnames
[i
]);
1167 if (original_dump_file
)
1169 dump_end (TDI_original
, original_dump_file
);
1170 original_dump_file
= NULL
;
1172 /* If an input file is missing, abandon further compilation.
1173 cpplib has issued a diagnostic. */
1174 if (!this_input_filename
)
1178 c_parse_final_cleanups ();
1181 /* Returns the appropriate dump file for PHASE to dump with FLAGS. */
1184 get_dump_info (int phase
, dump_flags_t
*flags
)
1186 gcc_assert (phase
== TDI_original
);
1188 *flags
= original_dump_flags
;
1189 return original_dump_file
;
1192 /* Common finish hook for the C, ObjC and C++ front ends. */
1194 c_common_finish (void)
1196 FILE *deps_stream
= NULL
;
1198 /* Note that we write the dependencies even if there are errors. This is
1199 useful for handling outdated generated headers that now trigger errors
1200 (for example, with #error) which would be resolved by re-generating
1201 them. In a sense, this complements -MG. */
1202 if (cpp_opts
->deps
.style
!= DEPS_NONE
)
1204 /* If -M or -MM was seen without -MF, default output to the
1207 deps_stream
= out_stream
;
1208 else if (deps_file
[0] == '-' && deps_file
[1] == '\0')
1209 deps_stream
= stdout
;
1212 deps_stream
= fopen (deps_file
, deps_append
? "a": "w");
1214 fatal_error (input_location
, "opening dependency file %s: %m",
1219 /* For performance, avoid tearing down cpplib's internal structures
1220 with cpp_destroy (). */
1221 cpp_finish (parse_in
, deps_stream
);
1223 if (deps_stream
&& deps_stream
!= out_stream
&& deps_stream
!= stdout
1224 && (ferror (deps_stream
) || fclose (deps_stream
)))
1225 fatal_error (input_location
, "closing dependency file %s: %m", deps_file
);
1227 if (out_stream
&& (ferror (out_stream
) || fclose (out_stream
)))
1228 fatal_error (input_location
, "when writing output to %s: %m", out_fname
);
1231 /* Either of two environment variables can specify output of
1232 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1233 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1234 and DEPS_TARGET is the target to mention in the deps. They also
1235 result in dependency information being appended to the output file
1236 rather than overwriting it, and like Sun's compiler
1237 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1239 check_deps_environment_vars (void)
1243 spec
= getenv ("DEPENDENCIES_OUTPUT");
1245 cpp_opts
->deps
.style
= DEPS_USER
;
1248 spec
= getenv ("SUNPRO_DEPENDENCIES");
1251 cpp_opts
->deps
.style
= DEPS_SYSTEM
;
1252 cpp_opts
->deps
.ignore_main_file
= true;
1258 /* Find the space before the DEPS_TARGET, if there is one. */
1259 char *s
= strchr (spec
, ' ');
1262 /* Let the caller perform MAKE quoting. */
1263 defer_opt (OPT_MT
, s
+ 1);
1267 /* Command line -MF overrides environment variables and default. */
1276 /* Handle deferred command line switches. */
1278 handle_deferred_opts (void)
1283 /* Avoid allocating the deps buffer if we don't need it.
1284 (This flag may be true without there having been -MT or -MQ
1285 options, but we'll still need the deps buffer.) */
1289 deps
= cpp_get_deps (parse_in
);
1291 for (i
= 0; i
< deferred_count
; i
++)
1293 struct deferred_opt
*opt
= &deferred_opts
[i
];
1295 if (opt
->code
== OPT_MT
|| opt
->code
== OPT_MQ
)
1296 deps_add_target (deps
, opt
->arg
, opt
->code
== OPT_MQ
);
1300 /* These settings are appropriate for GCC, but not necessarily so for
1301 cpplib as a library. */
1303 sanitize_cpp_opts (void)
1305 /* If we don't know what style of dependencies to output, complain
1306 if any other dependency switches have been given. */
1307 if (deps_seen
&& cpp_opts
->deps
.style
== DEPS_NONE
)
1308 error ("to generate dependencies you must specify either %<-M%> "
1311 /* -dM and dependencies suppress normal output; do it here so that
1312 the last -d[MDN] switch overrides earlier ones. */
1313 if (flag_dump_macros
== 'M')
1316 /* By default, -fdirectives-only implies -dD. This allows subsequent phases
1317 to perform proper macro expansion. */
1318 if (cpp_opts
->directives_only
&& !cpp_opts
->preprocessed
&& !flag_dump_macros
)
1319 flag_dump_macros
= 'D';
1321 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1322 -dM since at least glibc relies on -M -dM to work. */
1323 /* Also, flag_no_output implies flag_no_line_commands, always. */
1326 if (flag_dump_macros
!= 'M')
1327 flag_dump_macros
= 0;
1328 flag_dump_includes
= 0;
1329 flag_no_line_commands
= 1;
1331 else if (cpp_opts
->deps
.missing_files
)
1332 error ("%<-MG%> may only be used with %<-M%> or %<-MM%>");
1334 cpp_opts
->unsigned_char
= !flag_signed_char
;
1335 cpp_opts
->stdc_0_in_system_headers
= STDC_0_IN_SYSTEM_HEADERS
;
1337 /* Wlong-long is disabled by default. It is enabled by:
1338 [-Wpedantic | -Wtraditional] -std=[gnu|c]++98 ; or
1339 [-Wpedantic | -Wtraditional] -std=non-c99
1341 Either -Wlong-long or -Wno-long-long override any other settings.
1342 ??? These conditions should be handled in c.opt. */
1343 if (warn_long_long
== -1)
1345 warn_long_long
= ((pedantic
|| warn_traditional
)
1346 && (c_dialect_cxx () ? cxx_dialect
== cxx98
: !flag_isoc99
));
1347 cpp_opts
->cpp_warn_long_long
= warn_long_long
;
1350 /* If we're generating preprocessor output, emit current directory
1351 if explicitly requested or if debugging information is enabled.
1352 ??? Maybe we should only do it for debugging formats that
1353 actually output the current directory? */
1354 if (flag_working_directory
== -1)
1355 flag_working_directory
= (debug_info_level
!= DINFO_LEVEL_NONE
);
1357 if (warn_implicit_fallthrough
< 5)
1358 cpp_opts
->cpp_warn_implicit_fallthrough
= warn_implicit_fallthrough
;
1360 cpp_opts
->cpp_warn_implicit_fallthrough
= 0;
1362 if (cpp_opts
->directives_only
)
1364 if (cpp_warn_unused_macros
)
1365 error ("%<-fdirectives-only%> is incompatible "
1366 "with %<-Wunused-macros%>");
1367 if (cpp_opts
->traditional
)
1368 error ("%<-fdirectives-only%> is incompatible with %<-traditional%>");
1372 /* Add include path with a prefix at the front of its name. */
1374 add_prefixed_path (const char *suffix
, incpath_kind chain
)
1378 size_t prefix_len
, suffix_len
;
1380 suffix_len
= strlen (suffix
);
1381 prefix
= iprefix
? iprefix
: cpp_GCC_INCLUDE_DIR
;
1382 prefix_len
= iprefix
? strlen (iprefix
) : cpp_GCC_INCLUDE_DIR_len
;
1384 path
= (char *) xmalloc (prefix_len
+ suffix_len
+ 1);
1385 memcpy (path
, prefix
, prefix_len
);
1386 memcpy (path
+ prefix_len
, suffix
, suffix_len
);
1387 path
[prefix_len
+ suffix_len
] = '\0';
1389 add_path (path
, chain
, 0, false);
1392 /* Handle -D, -U, -A, -imacros, and the first -include. */
1394 c_finish_options (void)
1396 if (!cpp_opts
->preprocessed
)
1398 const line_map_ordinary
*bltin_map
1399 = linemap_check_ordinary (linemap_add (line_table
, LC_RENAME
, 0,
1400 _("<built-in>"), 0));
1401 cb_file_change (parse_in
, bltin_map
);
1403 /* Make sure all of the builtins about to be declared have
1404 BUILTINS_LOCATION has their location_t. */
1405 cpp_force_token_locations (parse_in
, BUILTINS_LOCATION
);
1407 cpp_init_builtins (parse_in
, flag_hosted
);
1408 c_cpp_builtins (parse_in
);
1410 /* We're about to send user input to cpplib, so make it warn for
1411 things that we previously (when we sent it internal definitions)
1412 told it to not warn.
1414 C99 permits implementation-defined characters in identifiers.
1415 The documented meaning of -std= is to turn off extensions that
1416 conflict with the specified standard, and since a strictly
1417 conforming program cannot contain a '$', we do not condition
1418 their acceptance on the -std= setting. */
1419 cpp_opts
->warn_dollars
= (cpp_opts
->cpp_pedantic
&& !cpp_opts
->c99
);
1421 const line_map_ordinary
*cmd_map
1422 = linemap_check_ordinary (linemap_add (line_table
, LC_RENAME
, 0,
1423 _("<command-line>"), 0));
1424 cb_file_change (parse_in
, cmd_map
);
1426 /* All command line defines must have the same location. */
1427 cpp_force_token_locations (parse_in
, cmd_map
->start_location
);
1428 for (size_t i
= 0; i
< deferred_count
; i
++)
1430 struct deferred_opt
*opt
= &deferred_opts
[i
];
1432 if (opt
->code
== OPT_D
)
1433 cpp_define (parse_in
, opt
->arg
);
1434 else if (opt
->code
== OPT_U
)
1435 cpp_undef (parse_in
, opt
->arg
);
1436 else if (opt
->code
== OPT_A
)
1438 if (opt
->arg
[0] == '-')
1439 cpp_unassert (parse_in
, opt
->arg
+ 1);
1441 cpp_assert (parse_in
, opt
->arg
);
1445 cpp_stop_forcing_token_locations (parse_in
);
1447 else if (cpp_opts
->directives_only
)
1448 cpp_init_special_builtins (parse_in
);
1450 /* Start the main input file, if the debug writer wants it. */
1451 if (debug_hooks
->start_end_main_source_file
1452 && !flag_preprocess_only
)
1453 (*debug_hooks
->start_source_file
) (0, this_input_filename
);
1455 if (!cpp_opts
->preprocessed
)
1456 /* Handle -imacros after -D and -U. */
1457 for (size_t i
= 0; i
< deferred_count
; i
++)
1459 struct deferred_opt
*opt
= &deferred_opts
[i
];
1461 if (opt
->code
== OPT_imacros
1462 && cpp_push_include (parse_in
, opt
->arg
))
1464 /* Disable push_command_line_include callback for now. */
1465 include_cursor
= deferred_count
+ 1;
1466 cpp_scan_nooutput (parse_in
);
1471 push_command_line_include ();
1474 /* Give CPP the next file given by -include, if any. */
1476 push_command_line_include (void)
1478 /* This can happen if disabled by -imacros for example.
1479 Punt so that we don't set "<command-line>" as the filename for
1481 if (include_cursor
> deferred_count
)
1484 if (!done_preinclude
)
1486 done_preinclude
= true;
1487 if (flag_hosted
&& std_inc
&& !cpp_opts
->preprocessed
)
1489 const char *preinc
= targetcm
.c_preinclude ();
1490 if (preinc
&& cpp_push_default_include (parse_in
, preinc
))
1495 pch_cpp_save_state ();
1497 while (include_cursor
< deferred_count
)
1499 struct deferred_opt
*opt
= &deferred_opts
[include_cursor
++];
1501 if (!cpp_opts
->preprocessed
&& opt
->code
== OPT_include
1502 && cpp_push_include (parse_in
, opt
->arg
))
1506 if (include_cursor
== deferred_count
)
1509 /* -Wunused-macros should only warn about macros defined hereafter. */
1510 cpp_opts
->warn_unused_macros
= cpp_warn_unused_macros
;
1511 /* Restore the line map back to the main file. */
1512 if (!cpp_opts
->preprocessed
)
1513 cpp_change_file (parse_in
, LC_RENAME
, this_input_filename
);
1515 /* Set this here so the client can change the option if it wishes,
1516 and after stacking the main file so we don't trace the main file. */
1517 line_table
->trace_includes
= cpp_opts
->print_include_names
;
1521 /* File change callback. Has to handle -include files. */
1523 cb_file_change (cpp_reader
* ARG_UNUSED (pfile
),
1524 const line_map_ordinary
*new_map
)
1526 if (flag_preprocess_only
)
1527 pp_file_change (new_map
);
1529 fe_file_change (new_map
);
1532 && (new_map
->reason
== LC_ENTER
|| new_map
->reason
== LC_RENAME
))
1534 /* Signal to plugins that a file is included. This could happen
1535 several times with the same file path, e.g. because of
1536 several '#include' or '#line' directives... */
1537 invoke_plugin_callbacks
1538 (PLUGIN_INCLUDE_FILE
,
1539 const_cast<char*> (ORDINARY_MAP_FILE_NAME (new_map
)));
1542 if (new_map
== 0 || (new_map
->reason
== LC_LEAVE
&& MAIN_FILE_P (new_map
)))
1544 pch_cpp_save_state ();
1545 push_command_line_include ();
1550 cb_dir_change (cpp_reader
* ARG_UNUSED (pfile
), const char *dir
)
1552 if (!set_src_pwd (dir
))
1553 warning (0, "too late for # directive to set debug directory");
1556 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1557 extensions if ISO). There is no concept of gnu94. */
1559 set_std_c89 (int c94
, int iso
)
1561 cpp_set_lang (parse_in
, c94
? CLK_STDC94
: iso
? CLK_STDC89
: CLK_GNUC89
);
1564 flag_no_gnu_keywords
= iso
;
1565 flag_no_nonansi_builtin
= iso
;
1570 lang_hooks
.name
= "GNU C89";
1573 /* Set the C 99 standard (without GNU extensions if ISO). */
1575 set_std_c99 (int iso
)
1577 cpp_set_lang (parse_in
, iso
? CLK_STDC99
: CLK_GNUC99
);
1579 flag_no_nonansi_builtin
= iso
;
1585 lang_hooks
.name
= "GNU C99";
1588 /* Set the C 11 standard (without GNU extensions if ISO). */
1590 set_std_c11 (int iso
)
1592 cpp_set_lang (parse_in
, iso
? CLK_STDC11
: CLK_GNUC11
);
1594 flag_no_nonansi_builtin
= iso
;
1600 lang_hooks
.name
= "GNU C11";
1603 /* Set the C 17 standard (without GNU extensions if ISO). */
1605 set_std_c17 (int iso
)
1607 cpp_set_lang (parse_in
, iso
? CLK_STDC17
: CLK_GNUC17
);
1609 flag_no_nonansi_builtin
= iso
;
1615 lang_hooks
.name
= "GNU C17";
1618 /* Set the C 2X standard (without GNU extensions if ISO). */
1620 set_std_c2x (int iso
)
1622 cpp_set_lang (parse_in
, iso
? CLK_STDC2X
: CLK_GNUC2X
);
1624 flag_no_nonansi_builtin
= iso
;
1630 lang_hooks
.name
= "GNU C2X";
1634 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1636 set_std_cxx98 (int iso
)
1638 cpp_set_lang (parse_in
, iso
? CLK_CXX98
: CLK_GNUCXX
);
1639 flag_no_gnu_keywords
= iso
;
1640 flag_no_nonansi_builtin
= iso
;
1644 cxx_dialect
= cxx98
;
1645 lang_hooks
.name
= "GNU C++98";
1648 /* Set the C++ 2011 standard (without GNU extensions if ISO). */
1650 set_std_cxx11 (int iso
)
1652 cpp_set_lang (parse_in
, iso
? CLK_CXX11
: CLK_GNUCXX11
);
1653 flag_no_gnu_keywords
= iso
;
1654 flag_no_nonansi_builtin
= iso
;
1656 /* C++11 includes the C99 standard library. */
1659 cxx_dialect
= cxx11
;
1660 lang_hooks
.name
= "GNU C++11";
1663 /* Set the C++ 2014 standard (without GNU extensions if ISO). */
1665 set_std_cxx14 (int iso
)
1667 cpp_set_lang (parse_in
, iso
? CLK_CXX14
: CLK_GNUCXX14
);
1668 flag_no_gnu_keywords
= iso
;
1669 flag_no_nonansi_builtin
= iso
;
1671 /* C++14 includes the C99 standard library. */
1674 cxx_dialect
= cxx14
;
1675 lang_hooks
.name
= "GNU C++14";
1678 /* Set the C++ 2017 standard (without GNU extensions if ISO). */
1680 set_std_cxx17 (int iso
)
1682 cpp_set_lang (parse_in
, iso
? CLK_CXX17
: CLK_GNUCXX17
);
1683 flag_no_gnu_keywords
= iso
;
1684 flag_no_nonansi_builtin
= iso
;
1686 /* C++17 includes the C11 standard library. */
1690 cxx_dialect
= cxx17
;
1691 lang_hooks
.name
= "GNU C++17";
1694 /* Set the C++ 202a draft standard (without GNU extensions if ISO). */
1696 set_std_cxx2a (int iso
)
1698 cpp_set_lang (parse_in
, iso
? CLK_CXX2A
: CLK_GNUCXX2A
);
1699 flag_no_gnu_keywords
= iso
;
1700 flag_no_nonansi_builtin
= iso
;
1702 /* C++17 includes the C11 standard library. */
1706 cxx_dialect
= cxx2a
;
1707 lang_hooks
.name
= "GNU C++17"; /* Pretend C++17 until standardization. */
1710 /* Args to -d specify what to dump. Silently ignore
1711 unrecognized options; they may be aimed at toplev.c. */
1713 handle_OPT_d (const char *arg
)
1717 while ((c
= *arg
++) != '\0')
1720 case 'M': /* Dump macros only. */
1721 case 'N': /* Dump names. */
1722 case 'D': /* Dump definitions. */
1723 case 'U': /* Dump used macros. */
1724 flag_dump_macros
= c
;
1728 flag_dump_includes
= 1;