1 /* C/ObjC/C++ command line option handling.
2 Copyright (C) 2002-2020 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_cxx20 (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 char *saved_prefix
= pp_take_prefix (context
->printer
);
172 pp_set_prefix (context
->printer
, NULL
);
173 pp_newline (context
->printer
);
174 diagnostic_show_locus (context
, diagnostic
->richloc
, diagnostic
->kind
);
175 /* By default print macro expansion contexts in the diagnostic
176 finalizer -- for tokens resulting from macro expansion. */
177 virt_loc_aware_diagnostic_finalizer (context
, diagnostic
);
178 pp_set_prefix (context
->printer
, saved_prefix
);
179 pp_flush (context
->printer
);
182 /* Common default settings for diagnostics. */
184 c_common_diagnostics_set_defaults (diagnostic_context
*context
)
186 diagnostic_finalizer (context
) = c_diagnostic_finalizer
;
187 context
->opt_permissive
= OPT_fpermissive
;
190 /* Whether options from all C-family languages should be accepted
192 static bool accept_all_c_family_options
= false;
194 /* Return whether to complain about a wrong-language option. */
196 c_common_complain_wrong_lang_p (const struct cl_option
*option
)
198 if (accept_all_c_family_options
199 && (option
->flags
& c_family_lang_mask
))
205 /* Initialize options structure OPTS. */
207 c_common_init_options_struct (struct gcc_options
*opts
)
209 opts
->x_flag_exceptions
= c_dialect_cxx ();
210 opts
->x_warn_pointer_arith
= c_dialect_cxx ();
211 opts
->x_warn_write_strings
= c_dialect_cxx ();
212 opts
->x_flag_warn_unused_result
= true;
214 /* By default, C99-like requirements for complex multiply and divide. */
215 opts
->x_flag_complex_method
= 2;
218 /* Common initialization before calling option handlers. */
220 c_common_init_options (unsigned int decoded_options_count
,
221 struct cl_decoded_option
*decoded_options
)
224 struct cpp_callbacks
*cb
;
227 = new (ggc_alloc
<string_concat_db
> ()) string_concat_db ();
229 parse_in
= cpp_create_reader (c_dialect_cxx () ? CLK_GNUCXX
: CLK_GNUC89
,
230 ident_hash
, line_table
);
231 cb
= cpp_get_callbacks (parse_in
);
232 cb
->diagnostic
= c_cpp_diagnostic
;
234 cpp_opts
= cpp_get_options (parse_in
);
235 cpp_opts
->dollars_in_ident
= DOLLARS_IN_IDENTIFIERS
;
236 cpp_opts
->objc
= c_dialect_objc ();
238 /* Reset to avoid warnings on internal definitions. We set it just
239 before passing on command-line options to cpplib. */
240 cpp_opts
->warn_dollars
= 0;
242 deferred_opts
= XNEWVEC (struct deferred_opt
, decoded_options_count
);
244 if (c_language
== clk_c
)
246 /* The default for C is gnu17. */
247 set_std_c17 (false /* ISO */);
249 /* If preprocessing assembly language, accept any of the C-family
250 front end options since the driver may pass them through. */
251 for (i
= 1; i
< decoded_options_count
; i
++)
252 if (decoded_options
[i
].opt_index
== OPT_lang_asm
)
254 accept_all_c_family_options
= true;
259 /* Set C++ standard to C++17 if not specified on the command line. */
260 if (c_dialect_cxx ())
261 set_std_cxx17 (/*ISO*/false);
263 global_dc
->colorize_source_p
= true;
266 /* Handle switch SCODE with argument ARG. VALUE is true, unless no-
267 form of an -f or -W option was given. Returns false if the switch was
268 invalid, true if valid. Use HANDLERS in recursive handle_option calls. */
270 c_common_handle_option (size_t scode
, const char *arg
, HOST_WIDE_INT value
,
271 int kind
, location_t loc
,
272 const struct cl_option_handlers
*handlers
)
274 const struct cl_option
*option
= &cl_options
[scode
];
275 enum opt_code code
= (enum opt_code
) scode
;
278 /* Prevent resetting the language standard to a C dialect when the driver
279 has already determined that we're looking at assembler input. */
280 bool preprocessing_asm_p
= (cpp_get_options (parse_in
)->lang
== CLK_ASM
);
285 if (cl_options
[code
].flags
& c_family_lang_mask
)
287 if ((option
->flags
& CL_TARGET
)
288 && ! targetcm
.handle_c_option (scode
, arg
, value
))
295 case OPT__output_pch_
:
300 defer_opt (code
, arg
);
304 cpp_opts
->discard_comments
= 0;
308 cpp_opts
->discard_comments
= 0;
309 cpp_opts
->discard_comments_in_macro_exp
= 0;
313 defer_opt (code
, arg
);
317 cpp_opts
->print_include_names
= 1;
321 TARGET_OPTF (xstrdup (arg
));
325 if (strcmp (arg
, "-"))
326 add_path (xstrdup (arg
), INC_BRACKET
, 0, true);
329 if (quote_chain_split
)
330 error ("%<-I-%> specified twice");
331 quote_chain_split
= true;
332 split_quote_chain ();
333 inform (input_location
, "obsolete option %<-I-%> used, "
334 "please use %<-iquote%> instead");
340 /* When doing dependencies with -M or -MM, suppress normal
341 preprocessed output, but still do -dM etc. as software
342 depends on this. Preprocessed output does occur if -MD, -MMD
343 or environment var dependency generation is used. */
344 cpp_opts
->deps
.style
= (code
== OPT_M
? DEPS_SYSTEM
: DEPS_USER
);
350 cpp_opts
->deps
.style
= (code
== OPT_MD
? DEPS_SYSTEM
: DEPS_USER
);
351 cpp_opts
->deps
.need_preprocessor_output
= true;
362 cpp_opts
->deps
.missing_files
= true;
367 cpp_opts
->deps
.phony_targets
= true;
373 defer_opt (code
, arg
);
377 flag_no_line_commands
= 1;
381 defer_opt (code
, arg
);
385 /* ??? Don't add new options here. Use LangEnabledBy in c.opt. */
387 cpp_opts
->warn_num_sign_change
= value
;
390 case OPT_Wunknown_pragmas
:
391 /* Set to greater than 1, so that even unknown pragmas in
392 system headers will be warned about. */
393 /* ??? There is no way to handle this automatically for now. */
394 warn_unknown_pragmas
= value
* 2;
398 if (!c_dialect_cxx ())
399 set_std_c89 (false, true);
401 set_std_cxx98 (true);
412 warning (0, "%<-Wabi=1%> is not supported, using =2");
415 warn_abi_version
= value
;
418 case OPT_fcanonical_system_headers
:
419 cpp_opts
->canonical_system_headers
= value
;
422 case OPT_fcond_mismatch
:
423 if (!c_dialect_cxx ())
425 flag_cond_mismatch
= value
;
428 warning (0, "switch %qs is no longer supported", option
->opt_text
);
435 disable_builtin_function (arg
);
438 case OPT_fdirectives_only
:
439 cpp_opts
->directives_only
= value
;
442 case OPT_fdollars_in_identifiers
:
443 cpp_opts
->dollars_in_ident
= value
;
446 case OPT_fmacro_prefix_map_
:
447 add_macro_prefix_map (arg
);
450 case OPT_ffreestanding
:
455 flag_no_builtin
= !value
;
458 case OPT_fconstant_string_class_
:
459 constant_string_class_name
= arg
;
462 case OPT_fextended_identifiers
:
463 cpp_opts
->extended_identifiers
= value
;
466 case OPT_fmax_include_depth_
:
467 cpp_opts
->max_include_depth
= value
;
470 case OPT_foperator_names
:
471 cpp_opts
->operator_names
= value
;
475 cpp_opts
->restore_pch_deps
= value
;
478 case OPT_fpch_preprocess
:
479 flag_pch_preprocess
= value
;
482 case OPT_fpermissive
:
483 flag_permissive
= value
;
484 global_dc
->permissive
= value
;
487 case OPT_fpreprocessed
:
488 cpp_opts
->preprocessed
= value
;
495 case OPT_ftrack_macro_expansion
:
500 case OPT_ftrack_macro_expansion_
:
501 if (arg
&& *arg
!= '\0')
502 cpp_opts
->track_macro_expansion
= value
;
504 cpp_opts
->track_macro_expansion
= 2;
508 /* It is documented that we silently ignore silly values. */
509 if (value
>= 1 && value
<= 100)
510 cpp_opts
->tabstop
= value
;
513 case OPT_fexec_charset_
:
514 cpp_opts
->narrow_charset
= arg
;
517 case OPT_fwide_exec_charset_
:
518 cpp_opts
->wide_charset
= arg
;
521 case OPT_finput_charset_
:
522 cpp_opts
->input_charset
= arg
;
525 case OPT_ftemplate_depth_
:
526 max_tinst_depth
= value
;
529 case OPT_fvisibility_inlines_hidden
:
530 visibility_options
.inlines_hidden
= value
;
533 case OPT_femit_struct_debug_baseonly
:
534 set_struct_debug_option (&global_options
, loc
, "base");
537 case OPT_femit_struct_debug_reduced
:
538 set_struct_debug_option (&global_options
, loc
,
539 "dir:ord:sys,dir:gen:any,ind:base");
542 case OPT_femit_struct_debug_detailed_
:
543 set_struct_debug_option (&global_options
, loc
, arg
);
546 case OPT_fext_numeric_literals
:
547 cpp_opts
->ext_numeric_literals
= value
;
551 add_path (xstrdup (arg
), INC_AFTER
, 0, true);
556 defer_opt (code
, arg
);
568 add_path (xstrdup (arg
), INC_QUOTE
, 0, true);
576 add_path (xstrdup (arg
), INC_SYSTEM
, 0, true);
579 case OPT_iwithprefix
:
580 add_prefixed_path (arg
, INC_SYSTEM
);
583 case OPT_iwithprefixbefore
:
584 add_prefixed_path (arg
, INC_BRACKET
);
588 cpp_set_lang (parse_in
, CLK_ASM
);
589 cpp_opts
->dollars_in_ident
= false;
604 error ("output filename specified twice");
607 case OPT_print_objc_runtime_info
:
608 print_struct_values
= 1;
616 case OPT_std_gnu__98
:
617 if (!preprocessing_asm_p
)
618 set_std_cxx98 (code
== OPT_std_c__98
/* ISO */);
622 case OPT_std_gnu__11
:
623 if (!preprocessing_asm_p
)
624 set_std_cxx11 (code
== OPT_std_c__11
/* ISO */);
628 case OPT_std_gnu__14
:
629 if (!preprocessing_asm_p
)
630 set_std_cxx14 (code
== OPT_std_c__14
/* ISO */);
634 case OPT_std_gnu__17
:
635 if (!preprocessing_asm_p
)
636 set_std_cxx17 (code
== OPT_std_c__17
/* ISO */);
640 case OPT_std_gnu__20
:
641 if (!preprocessing_asm_p
)
642 set_std_cxx20 (code
== OPT_std_c__20
/* ISO */);
646 case OPT_std_iso9899_199409
:
647 if (!preprocessing_asm_p
)
648 set_std_c89 (code
== OPT_std_iso9899_199409
/* c94 */, true /* ISO */);
652 if (!preprocessing_asm_p
)
653 set_std_c89 (false /* c94 */, false /* ISO */);
657 if (!preprocessing_asm_p
)
658 set_std_c99 (true /* ISO */);
662 if (!preprocessing_asm_p
)
663 set_std_c99 (false /* ISO */);
667 if (!preprocessing_asm_p
)
668 set_std_c11 (true /* ISO */);
672 if (!preprocessing_asm_p
)
673 set_std_c11 (false /* ISO */);
677 if (!preprocessing_asm_p
)
678 set_std_c17 (true /* ISO */);
682 if (!preprocessing_asm_p
)
683 set_std_c17 (false /* ISO */);
687 if (!preprocessing_asm_p
)
688 set_std_c2x (true /* ISO */);
692 if (!preprocessing_asm_p
)
693 set_std_c2x (false /* ISO */);
697 cpp_opts
->trigraphs
= 1;
700 case OPT_traditional_cpp
:
701 cpp_opts
->traditional
= 1;
712 C_handle_option_auto (&global_options
, &global_options_set
,
714 c_family_lang_mask
, kind
,
715 loc
, handlers
, global_dc
);
719 ObjC_handle_option_auto (&global_options
, &global_options_set
,
721 c_family_lang_mask
, kind
,
722 loc
, handlers
, global_dc
);
726 CXX_handle_option_auto (&global_options
, &global_options_set
,
728 c_family_lang_mask
, kind
,
729 loc
, handlers
, global_dc
);
733 ObjCXX_handle_option_auto (&global_options
, &global_options_set
,
735 c_family_lang_mask
, kind
,
736 loc
, handlers
, global_dc
);
743 cpp_handle_option_auto (&global_options
, scode
, cpp_opts
);
747 /* Default implementation of TARGET_HANDLE_C_OPTION. */
750 default_handle_c_option (size_t code ATTRIBUTE_UNUSED
,
751 const char *arg ATTRIBUTE_UNUSED
,
752 int value ATTRIBUTE_UNUSED
)
757 /* Post-switch processing. */
759 c_common_post_options (const char **pfilename
)
761 struct cpp_callbacks
*cb
;
763 /* Canonicalize the input and output filenames. */
764 if (in_fnames
== NULL
)
766 in_fnames
= XNEWVEC (const char *, 1);
769 else if (strcmp (in_fnames
[0], "-") == 0)
772 error ("cannot use %<-%> as input filename for a precompiled header");
777 if (out_fname
== NULL
|| !strcmp (out_fname
, "-"))
780 if (cpp_opts
->deps
.style
== DEPS_NONE
)
781 check_deps_environment_vars ();
783 handle_deferred_opts ();
785 sanitize_cpp_opts ();
787 register_include_chains (parse_in
, sysroot
, iprefix
, imultilib
,
788 std_inc
, std_cxx_inc
&& c_dialect_cxx (), verbose
);
790 #ifdef C_COMMON_OVERRIDE_OPTIONS
791 /* Some machines may reject certain combinations of C
792 language-specific options. */
793 C_COMMON_OVERRIDE_OPTIONS
;
796 /* Excess precision other than "fast" requires front-end
798 if (c_dialect_cxx ())
800 if (flag_excess_precision
== EXCESS_PRECISION_STANDARD
)
801 sorry ("%<-fexcess-precision=standard%> for C++");
802 flag_excess_precision
= EXCESS_PRECISION_FAST
;
804 else if (flag_excess_precision
== EXCESS_PRECISION_DEFAULT
)
805 flag_excess_precision
= (flag_iso
? 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 /* C2X Annex F does not permit certain built-in functions to raise
833 SET_OPTION_IF_UNSET (&global_options
, &global_options_set
,
834 flag_fp_int_builtin_inexact
, 0);
836 /* By default we use C99 inline semantics in GNU99 or C99 mode. C99
837 inline semantics are not supported in GNU89 or C89 mode. */
838 if (flag_gnu89_inline
== -1)
839 flag_gnu89_inline
= !flag_isoc99
;
840 else if (!flag_gnu89_inline
&& !flag_isoc99
)
841 error ("%<-fno-gnu89-inline%> is only supported in GNU99 or C99 mode");
843 /* Default to ObjC sjlj exception handling if NeXT runtime. */
844 if (flag_objc_sjlj_exceptions
< 0)
845 flag_objc_sjlj_exceptions
= flag_next_runtime
;
846 if (flag_objc_exceptions
&& !flag_objc_sjlj_exceptions
)
849 /* If -ffreestanding, -fno-hosted or -fno-builtin then disable
850 pattern recognition. */
852 SET_OPTION_IF_UNSET (&global_options
, &global_options_set
,
853 flag_tree_loop_distribute_patterns
, 0);
855 /* -Woverlength-strings is off by default, but is enabled by -Wpedantic.
856 It is never enabled in C++, as the minimum limit is not normative
858 if (c_dialect_cxx ())
859 warn_overlength_strings
= 0;
861 /* Wmain is enabled by default in C++ but not in C. */
862 /* Wmain is disabled by default for -ffreestanding (!flag_hosted),
863 even if -Wall or -Wpedantic was given (warn_main will be 2 if set
864 by -Wall, 1 if set by -Wmain). */
866 warn_main
= (c_dialect_cxx () && flag_hosted
) ? 1 : 0;
867 else if (warn_main
== 2)
868 warn_main
= flag_hosted
? 1 : 0;
870 /* In C, -Wall and -Wc++-compat enable -Wenum-compare; if it has not
871 yet been set, it is disabled by default. In C++, it is enabled
873 if (warn_enum_compare
== -1)
874 warn_enum_compare
= c_dialect_cxx () ? 1 : 0;
876 /* -Wpacked-bitfield-compat is on by default for the C languages. The
877 warning is issued in stor-layout.c which is not part of the front-end so
878 we need to selectively turn it on here. */
879 if (warn_packed_bitfield_compat
== -1)
880 warn_packed_bitfield_compat
= 1;
882 /* Special format checking options don't work without -Wformat; warn if
886 warning (OPT_Wformat_y2k
,
887 "%<-Wformat-y2k%> ignored without %<-Wformat%>");
888 warning (OPT_Wformat_extra_args
,
889 "%<-Wformat-extra-args%> ignored without %<-Wformat%>");
890 warning (OPT_Wformat_zero_length
,
891 "%<-Wformat-zero-length%> ignored without %<-Wformat%>");
892 warning (OPT_Wformat_nonliteral
,
893 "%<-Wformat-nonliteral%> ignored without %<-Wformat%>");
894 warning (OPT_Wformat_contains_nul
,
895 "%<-Wformat-contains-nul%> ignored without %<-Wformat%>");
896 warning (OPT_Wformat_security
,
897 "%<-Wformat-security%> ignored without %<-Wformat%>");
900 /* -Wimplicit-function-declaration is enabled by default for C99. */
901 if (warn_implicit_function_declaration
== -1)
902 warn_implicit_function_declaration
= flag_isoc99
;
904 /* -Wimplicit-int is enabled by default for C99. */
905 if (warn_implicit_int
== -1)
906 warn_implicit_int
= flag_isoc99
;
908 /* -Wold-style-definition is enabled by default for C2X. */
909 if (warn_old_style_definition
== -1)
910 warn_old_style_definition
= flag_isoc2x
;
912 /* -Wshift-overflow is enabled by default in C99 and C++11 modes. */
913 if (warn_shift_overflow
== -1)
914 warn_shift_overflow
= cxx_dialect
>= cxx11
|| flag_isoc99
;
916 /* -Wshift-negative-value is enabled by -Wextra in C99 and C++11 modes. */
917 if (warn_shift_negative_value
== -1)
918 warn_shift_negative_value
= (extra_warnings
919 && (cxx_dialect
>= cxx11
|| flag_isoc99
));
921 /* -Wregister is enabled by default in C++17. */
922 SET_OPTION_IF_UNSET (&global_options
, &global_options_set
, warn_register
,
923 cxx_dialect
>= cxx17
);
925 /* -Wcomma-subscript is enabled by default in C++20. */
926 SET_OPTION_IF_UNSET (&global_options
, &global_options_set
,
927 warn_comma_subscript
,
928 cxx_dialect
>= cxx20
&& warn_deprecated
);
930 /* -Wvolatile is enabled by default in C++20. */
931 SET_OPTION_IF_UNSET (&global_options
, &global_options_set
, warn_volatile
,
932 cxx_dialect
>= cxx20
&& warn_deprecated
);
934 /* Declone C++ 'structors if -Os. */
935 if (flag_declone_ctor_dtor
== -1)
936 flag_declone_ctor_dtor
= optimize_size
;
938 if (flag_abi_compat_version
== 1)
940 warning (0, "%<-fabi-compat-version=1%> is not supported, using =2");
941 flag_abi_compat_version
= 2;
944 /* Change flag_abi_version to be the actual current ABI level, for the
945 benefit of c_cpp_builtins, and to make comparison simpler. */
946 const int latest_abi_version
= 14;
947 /* Generate compatibility aliases for ABI v11 (7.1) by default. */
948 const int abi_compat_default
= 11;
950 #define clamp(X) if (X == 0 || X > latest_abi_version) X = latest_abi_version
951 clamp (flag_abi_version
);
952 clamp (warn_abi_version
);
953 clamp (flag_abi_compat_version
);
956 /* Default -Wabi= or -fabi-compat-version= from each other. */
957 if (warn_abi_version
== -1 && flag_abi_compat_version
!= -1)
958 warn_abi_version
= flag_abi_compat_version
;
959 else if (flag_abi_compat_version
== -1 && warn_abi_version
!= -1)
960 flag_abi_compat_version
= warn_abi_version
;
961 else if (warn_abi_version
== -1 && flag_abi_compat_version
== -1)
963 warn_abi_version
= latest_abi_version
;
964 if (flag_abi_version
== latest_abi_version
)
966 auto_diagnostic_group d
;
967 if (warning (OPT_Wabi
, "%<-Wabi%> won%'t warn about anything"))
969 inform (input_location
, "%<-Wabi%> warns about differences "
970 "from the most up-to-date ABI, which is also used "
972 inform (input_location
, "use e.g. %<-Wabi=11%> to warn about "
973 "changes from GCC 7");
975 flag_abi_compat_version
= abi_compat_default
;
978 flag_abi_compat_version
= latest_abi_version
;
981 /* By default, enable the new inheriting constructor semantics along with ABI
982 11. New and old should coexist fine, but it is a change in what
983 artificial symbols are generated. */
984 SET_OPTION_IF_UNSET (&global_options
, &global_options_set
,
985 flag_new_inheriting_ctors
,
986 abi_version_at_least (11));
988 /* For GCC 7, only enable DR150 resolution by default if -std=c++17. */
989 SET_OPTION_IF_UNSET (&global_options
, &global_options_set
, flag_new_ttp
,
990 cxx_dialect
>= cxx17
);
992 /* C++11 guarantees forward progress. */
993 SET_OPTION_IF_UNSET (&global_options
, &global_options_set
, flag_finite_loops
,
994 optimize
>= 2 && cxx_dialect
>= cxx11
);
996 if (cxx_dialect
>= cxx11
)
998 /* If we're allowing C++0x constructs, don't warn about C++98
999 identifiers which are keywords in C++0x. */
1000 warn_cxx11_compat
= 0;
1001 cpp_opts
->cpp_warn_cxx11_compat
= 0;
1003 if (warn_narrowing
== -1)
1006 /* Unless -f{,no-}ext-numeric-literals has been used explicitly,
1007 for -std=c++{11,14,17,2a} default to -fno-ext-numeric-literals. */
1008 if (flag_iso
&& !global_options_set
.x_flag_ext_numeric_literals
)
1009 cpp_opts
->ext_numeric_literals
= 0;
1011 else if (warn_narrowing
== -1)
1014 /* C++17 has stricter evaluation order requirements; let's use some of them
1015 for earlier C++ as well, so chaining works as expected. */
1016 if (c_dialect_cxx ()
1017 && flag_strong_eval_order
== -1)
1018 flag_strong_eval_order
= (cxx_dialect
>= cxx17
? 2 : 1);
1020 /* Global sized deallocation is new in C++14. */
1021 if (flag_sized_deallocation
== -1)
1022 flag_sized_deallocation
= (cxx_dialect
>= cxx14
);
1024 /* char8_t support is new in C++20. */
1025 if (flag_char8_t
== -1)
1026 flag_char8_t
= (cxx_dialect
>= cxx20
);
1028 if (flag_extern_tls_init
)
1030 if (!TARGET_SUPPORTS_ALIASES
|| !SUPPORTS_WEAK
)
1032 /* Lazy TLS initialization for a variable in another TU requires
1033 alias and weak reference support. */
1034 if (flag_extern_tls_init
> 0)
1035 sorry ("external TLS initialization functions not supported "
1038 flag_extern_tls_init
= 0;
1041 flag_extern_tls_init
= 1;
1044 /* Enable by default only for C++ and C++ with ObjC extensions. */
1045 if (warn_return_type
== -1 && c_dialect_cxx ())
1046 warn_return_type
= 1;
1048 /* C++20 is the final version of concepts. We still use -fconcepts
1049 to know when concepts are enabled. Note that -fconcepts-ts can
1050 be used to include additional features, although modified to
1051 work with the standard. */
1052 if (cxx_dialect
>= cxx20
|| flag_concepts_ts
)
1054 else if (flag_concepts
)
1055 /* For -std=c++17 -fconcepts, imply -fconcepts-ts. */
1056 flag_concepts_ts
= 1;
1058 if (num_in_fnames
> 1)
1059 error ("too many filenames given; type %<%s %s%> for usage",
1060 progname
, "--help");
1062 if (flag_preprocess_only
)
1064 /* Open the output now. We must do so even if flag_no_output is
1065 on, because there may be other output than from the actual
1066 preprocessing (e.g. from -dM). */
1067 if (out_fname
[0] == '\0')
1068 out_stream
= stdout
;
1070 out_stream
= fopen (out_fname
, "w");
1072 if (out_stream
== NULL
)
1074 fatal_error (input_location
, "opening output file %s: %m", out_fname
);
1078 init_pp_output (out_stream
);
1084 /* When writing a PCH file, avoid reading some other PCH file,
1085 because the default address space slot then can't be used
1086 for the output PCH file. */
1089 c_common_no_more_pch ();
1090 /* Only -g0 and -gdwarf* are supported with PCH, for other
1091 debug formats we warn here and refuse to load any PCH files. */
1092 if (write_symbols
!= NO_DEBUG
&& write_symbols
!= DWARF2_DEBUG
)
1093 warning (OPT_Wdeprecated
,
1094 "the %qs debug format cannot be used with "
1095 "pre-compiled headers", debug_type_names
[write_symbols
]);
1097 else if (write_symbols
!= NO_DEBUG
&& write_symbols
!= DWARF2_DEBUG
)
1098 c_common_no_more_pch ();
1100 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1101 input_location
= UNKNOWN_LOCATION
;
1104 cb
= cpp_get_callbacks (parse_in
);
1105 cb
->file_change
= cb_file_change
;
1106 cb
->dir_change
= cb_dir_change
;
1107 cpp_post_options (parse_in
);
1108 init_global_opts_from_cpp (&global_options
, cpp_get_options (parse_in
));
1110 input_location
= UNKNOWN_LOCATION
;
1112 *pfilename
= this_input_filename
1113 = cpp_read_main_file (parse_in
, in_fnames
[0]);
1114 /* Don't do any compilation or preprocessing if there is no input file. */
1115 if (this_input_filename
== NULL
)
1121 if (flag_working_directory
1122 && flag_preprocess_only
&& !flag_no_line_commands
)
1123 pp_dir_change (parse_in
, get_src_pwd ());
1125 /* Disable LTO output when outputting a precompiled header. */
1126 if (pch_file
&& flag_lto
)
1129 flag_generate_lto
= 0;
1132 return flag_preprocess_only
;
1135 /* Front end initialization common to C, ObjC and C++. */
1137 c_common_init (void)
1139 /* Set up preprocessor arithmetic. Must be done after call to
1140 c_common_nodes_and_builtins for type nodes to be good. */
1141 cpp_opts
->precision
= TYPE_PRECISION (intmax_type_node
);
1142 cpp_opts
->char_precision
= TYPE_PRECISION (char_type_node
);
1143 cpp_opts
->int_precision
= TYPE_PRECISION (integer_type_node
);
1144 cpp_opts
->wchar_precision
= TYPE_PRECISION (wchar_type_node
);
1145 cpp_opts
->unsigned_wchar
= TYPE_UNSIGNED (wchar_type_node
);
1146 cpp_opts
->bytes_big_endian
= BYTES_BIG_ENDIAN
;
1148 /* This can't happen until after wchar_precision and bytes_big_endian
1150 cpp_init_iconv (parse_in
);
1155 fputs ("Compiler executable checksum: ", stderr
);
1156 for (i
= 0; i
< 16; i
++)
1157 fprintf (stderr
, "%02x", executable_checksum
[i
]);
1158 putc ('\n', stderr
);
1161 /* Has to wait until now so that cpplib has its hash table. */
1164 if (flag_preprocess_only
)
1166 c_finish_options ();
1167 preprocess_file (parse_in
);
1174 /* Initialize the integrated preprocessor after debug output has been
1175 initialized; loop over each input file. */
1177 c_common_parse_file (void)
1184 c_finish_options ();
1185 /* Open the dump file to use for the original dump output
1186 here, to be used during parsing for the current file. */
1187 original_dump_file
= dump_begin (TDI_original
, &original_dump_flags
);
1192 /* And end the main input file, if the debug writer wants it */
1193 if (debug_hooks
->start_end_main_source_file
)
1194 (*debug_hooks
->end_source_file
) (0);
1195 if (++i
>= num_in_fnames
)
1197 cpp_undef_all (parse_in
);
1198 cpp_clear_file_cache (parse_in
);
1200 = cpp_read_main_file (parse_in
, in_fnames
[i
]);
1201 if (original_dump_file
)
1203 dump_end (TDI_original
, original_dump_file
);
1204 original_dump_file
= NULL
;
1206 /* If an input file is missing, abandon further compilation.
1207 cpplib has issued a diagnostic. */
1208 if (!this_input_filename
)
1212 c_parse_final_cleanups ();
1215 /* Returns the appropriate dump file for PHASE to dump with FLAGS. */
1218 get_dump_info (int phase
, dump_flags_t
*flags
)
1220 gcc_assert (phase
== TDI_original
);
1222 *flags
= original_dump_flags
;
1223 return original_dump_file
;
1226 /* Common finish hook for the C, ObjC and C++ front ends. */
1228 c_common_finish (void)
1230 FILE *deps_stream
= NULL
;
1232 /* Note that we write the dependencies even if there are errors. This is
1233 useful for handling outdated generated headers that now trigger errors
1234 (for example, with #error) which would be resolved by re-generating
1235 them. In a sense, this complements -MG. */
1236 if (cpp_opts
->deps
.style
!= DEPS_NONE
)
1238 /* If -M or -MM was seen without -MF, default output to the
1241 deps_stream
= out_stream
;
1242 else if (deps_file
[0] == '-' && deps_file
[1] == '\0')
1243 deps_stream
= stdout
;
1246 deps_stream
= fopen (deps_file
, deps_append
? "a": "w");
1248 fatal_error (input_location
, "opening dependency file %s: %m",
1253 /* For performance, avoid tearing down cpplib's internal structures
1254 with cpp_destroy (). */
1255 cpp_finish (parse_in
, deps_stream
);
1257 if (deps_stream
&& deps_stream
!= out_stream
&& deps_stream
!= stdout
1258 && (ferror (deps_stream
) || fclose (deps_stream
)))
1259 fatal_error (input_location
, "closing dependency file %s: %m", deps_file
);
1261 if (out_stream
&& (ferror (out_stream
) || fclose (out_stream
)))
1262 fatal_error (input_location
, "when writing output to %s: %m", out_fname
);
1265 /* Either of two environment variables can specify output of
1266 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1267 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1268 and DEPS_TARGET is the target to mention in the deps. They also
1269 result in dependency information being appended to the output file
1270 rather than overwriting it, and like Sun's compiler
1271 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1273 check_deps_environment_vars (void)
1277 spec
= getenv ("DEPENDENCIES_OUTPUT");
1279 cpp_opts
->deps
.style
= DEPS_USER
;
1282 spec
= getenv ("SUNPRO_DEPENDENCIES");
1285 cpp_opts
->deps
.style
= DEPS_SYSTEM
;
1286 cpp_opts
->deps
.ignore_main_file
= true;
1292 /* Find the space before the DEPS_TARGET, if there is one. */
1293 char *s
= strchr (spec
, ' ');
1296 /* Let the caller perform MAKE quoting. */
1297 defer_opt (OPT_MT
, s
+ 1);
1301 /* Command line -MF overrides environment variables and default. */
1310 /* Handle deferred command line switches. */
1312 handle_deferred_opts (void)
1314 /* Avoid allocating the deps buffer if we don't need it.
1315 (This flag may be true without there having been -MT or -MQ
1316 options, but we'll still need the deps buffer.) */
1320 if (mkdeps
*deps
= cpp_get_deps (parse_in
))
1321 for (unsigned i
= 0; i
< deferred_count
; i
++)
1323 struct deferred_opt
*opt
= &deferred_opts
[i
];
1325 if (opt
->code
== OPT_MT
|| opt
->code
== OPT_MQ
)
1326 deps_add_target (deps
, opt
->arg
, opt
->code
== OPT_MQ
);
1330 /* These settings are appropriate for GCC, but not necessarily so for
1331 cpplib as a library. */
1333 sanitize_cpp_opts (void)
1335 /* If we don't know what style of dependencies to output, complain
1336 if any other dependency switches have been given. */
1337 if (deps_seen
&& cpp_opts
->deps
.style
== DEPS_NONE
)
1338 error ("to generate dependencies you must specify either %<-M%> "
1341 /* -dM and dependencies suppress normal output; do it here so that
1342 the last -d[MDN] switch overrides earlier ones. */
1343 if (flag_dump_macros
== 'M')
1346 /* By default, -fdirectives-only implies -dD. This allows subsequent phases
1347 to perform proper macro expansion. */
1348 if (cpp_opts
->directives_only
&& !cpp_opts
->preprocessed
&& !flag_dump_macros
)
1349 flag_dump_macros
= 'D';
1351 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1352 -dM since at least glibc relies on -M -dM to work. */
1353 /* Also, flag_no_output implies flag_no_line_commands, always. */
1356 if (flag_dump_macros
!= 'M')
1357 flag_dump_macros
= 0;
1358 flag_dump_includes
= 0;
1359 flag_no_line_commands
= 1;
1361 else if (cpp_opts
->deps
.missing_files
)
1362 error ("%<-MG%> may only be used with %<-M%> or %<-MM%>");
1364 cpp_opts
->unsigned_char
= !flag_signed_char
;
1365 cpp_opts
->stdc_0_in_system_headers
= STDC_0_IN_SYSTEM_HEADERS
;
1367 /* Wlong-long is disabled by default. It is enabled by:
1368 [-Wpedantic | -Wtraditional] -std=[gnu|c]++98 ; or
1369 [-Wpedantic | -Wtraditional] -std=non-c99
1371 Either -Wlong-long or -Wno-long-long override any other settings.
1372 ??? These conditions should be handled in c.opt. */
1373 if (warn_long_long
== -1)
1375 warn_long_long
= ((pedantic
|| warn_traditional
)
1376 && (c_dialect_cxx () ? cxx_dialect
== cxx98
: !flag_isoc99
));
1377 cpp_opts
->cpp_warn_long_long
= warn_long_long
;
1380 /* If we're generating preprocessor output, emit current directory
1381 if explicitly requested or if debugging information is enabled.
1382 ??? Maybe we should only do it for debugging formats that
1383 actually output the current directory? */
1384 if (flag_working_directory
== -1)
1385 flag_working_directory
= (debug_info_level
!= DINFO_LEVEL_NONE
);
1387 if (warn_implicit_fallthrough
< 5)
1388 cpp_opts
->cpp_warn_implicit_fallthrough
= warn_implicit_fallthrough
;
1390 cpp_opts
->cpp_warn_implicit_fallthrough
= 0;
1392 if (cpp_opts
->directives_only
)
1394 if (cpp_warn_unused_macros
)
1395 error ("%<-fdirectives-only%> is incompatible "
1396 "with %<-Wunused-macros%>");
1397 if (cpp_opts
->traditional
)
1398 error ("%<-fdirectives-only%> is incompatible with %<-traditional%>");
1402 /* Add include path with a prefix at the front of its name. */
1404 add_prefixed_path (const char *suffix
, incpath_kind chain
)
1408 size_t prefix_len
, suffix_len
;
1410 suffix_len
= strlen (suffix
);
1411 prefix
= iprefix
? iprefix
: cpp_GCC_INCLUDE_DIR
;
1412 prefix_len
= iprefix
? strlen (iprefix
) : cpp_GCC_INCLUDE_DIR_len
;
1414 path
= (char *) xmalloc (prefix_len
+ suffix_len
+ 1);
1415 memcpy (path
, prefix
, prefix_len
);
1416 memcpy (path
+ prefix_len
, suffix
, suffix_len
);
1417 path
[prefix_len
+ suffix_len
] = '\0';
1419 add_path (path
, chain
, 0, false);
1422 /* Handle -D, -U, -A, -imacros, and the first -include. */
1424 c_finish_options (void)
1426 if (!cpp_opts
->preprocessed
)
1428 const line_map_ordinary
*bltin_map
1429 = linemap_check_ordinary (linemap_add (line_table
, LC_RENAME
, 0,
1430 _("<built-in>"), 0));
1431 cb_file_change (parse_in
, bltin_map
);
1433 /* Make sure all of the builtins about to be declared have
1434 BUILTINS_LOCATION has their location_t. */
1435 cpp_force_token_locations (parse_in
, BUILTINS_LOCATION
);
1437 cpp_init_builtins (parse_in
, flag_hosted
);
1438 c_cpp_builtins (parse_in
);
1440 /* We're about to send user input to cpplib, so make it warn for
1441 things that we previously (when we sent it internal definitions)
1442 told it to not warn.
1444 C99 permits implementation-defined characters in identifiers.
1445 The documented meaning of -std= is to turn off extensions that
1446 conflict with the specified standard, and since a strictly
1447 conforming program cannot contain a '$', we do not condition
1448 their acceptance on the -std= setting. */
1449 cpp_opts
->warn_dollars
= (cpp_opts
->cpp_pedantic
&& !cpp_opts
->c99
);
1451 const line_map_ordinary
*cmd_map
1452 = linemap_check_ordinary (linemap_add (line_table
, LC_RENAME
, 0,
1453 _("<command-line>"), 0));
1454 cb_file_change (parse_in
, cmd_map
);
1456 /* All command line defines must have the same location. */
1457 cpp_force_token_locations (parse_in
, cmd_map
->start_location
);
1458 for (size_t i
= 0; i
< deferred_count
; i
++)
1460 struct deferred_opt
*opt
= &deferred_opts
[i
];
1462 if (opt
->code
== OPT_D
)
1463 cpp_define (parse_in
, opt
->arg
);
1464 else if (opt
->code
== OPT_U
)
1465 cpp_undef (parse_in
, opt
->arg
);
1466 else if (opt
->code
== OPT_A
)
1468 if (opt
->arg
[0] == '-')
1469 cpp_unassert (parse_in
, opt
->arg
+ 1);
1471 cpp_assert (parse_in
, opt
->arg
);
1475 cpp_stop_forcing_token_locations (parse_in
);
1477 else if (cpp_opts
->directives_only
)
1478 cpp_init_special_builtins (parse_in
);
1480 /* Start the main input file, if the debug writer wants it. */
1481 if (debug_hooks
->start_end_main_source_file
1482 && !flag_preprocess_only
)
1483 (*debug_hooks
->start_source_file
) (0, this_input_filename
);
1485 if (!cpp_opts
->preprocessed
)
1486 /* Handle -imacros after -D and -U. */
1487 for (size_t i
= 0; i
< deferred_count
; i
++)
1489 struct deferred_opt
*opt
= &deferred_opts
[i
];
1491 if (opt
->code
== OPT_imacros
1492 && cpp_push_include (parse_in
, opt
->arg
))
1494 /* Disable push_command_line_include callback for now. */
1495 include_cursor
= deferred_count
+ 1;
1496 cpp_scan_nooutput (parse_in
);
1501 push_command_line_include ();
1504 /* Give CPP the next file given by -include, if any. */
1506 push_command_line_include (void)
1508 /* This can happen if disabled by -imacros for example.
1509 Punt so that we don't set "<command-line>" as the filename for
1511 if (include_cursor
> deferred_count
)
1514 if (!done_preinclude
)
1516 done_preinclude
= true;
1517 if (flag_hosted
&& std_inc
&& !cpp_opts
->preprocessed
)
1519 const char *preinc
= targetcm
.c_preinclude ();
1520 if (preinc
&& cpp_push_default_include (parse_in
, preinc
))
1525 pch_cpp_save_state ();
1527 while (include_cursor
< deferred_count
)
1529 struct deferred_opt
*opt
= &deferred_opts
[include_cursor
++];
1531 if (!cpp_opts
->preprocessed
&& opt
->code
== OPT_include
1532 && cpp_push_include (parse_in
, opt
->arg
))
1536 if (include_cursor
== deferred_count
)
1539 /* -Wunused-macros should only warn about macros defined hereafter. */
1540 cpp_opts
->warn_unused_macros
= cpp_warn_unused_macros
;
1541 /* Restore the line map back to the main file. */
1542 if (!cpp_opts
->preprocessed
)
1543 cpp_change_file (parse_in
, LC_RENAME
, this_input_filename
);
1545 /* Set this here so the client can change the option if it wishes,
1546 and after stacking the main file so we don't trace the main file. */
1547 line_table
->trace_includes
= cpp_opts
->print_include_names
;
1551 /* File change callback. Has to handle -include files. */
1553 cb_file_change (cpp_reader
* ARG_UNUSED (pfile
),
1554 const line_map_ordinary
*new_map
)
1556 if (flag_preprocess_only
)
1557 pp_file_change (new_map
);
1559 fe_file_change (new_map
);
1562 && (new_map
->reason
== LC_ENTER
|| new_map
->reason
== LC_RENAME
))
1564 /* Signal to plugins that a file is included. This could happen
1565 several times with the same file path, e.g. because of
1566 several '#include' or '#line' directives... */
1567 invoke_plugin_callbacks
1568 (PLUGIN_INCLUDE_FILE
,
1569 const_cast<char*> (ORDINARY_MAP_FILE_NAME (new_map
)));
1572 if (new_map
== 0 || (new_map
->reason
== LC_LEAVE
&& MAIN_FILE_P (new_map
)))
1574 pch_cpp_save_state ();
1575 push_command_line_include ();
1580 cb_dir_change (cpp_reader
* ARG_UNUSED (pfile
), const char *dir
)
1582 if (!set_src_pwd (dir
))
1583 warning (0, "too late for # directive to set debug directory");
1586 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1587 extensions if ISO). There is no concept of gnu94. */
1589 set_std_c89 (int c94
, int iso
)
1591 cpp_set_lang (parse_in
, c94
? CLK_STDC94
: iso
? CLK_STDC89
: CLK_GNUC89
);
1594 flag_no_gnu_keywords
= iso
;
1595 flag_no_nonansi_builtin
= iso
;
1600 lang_hooks
.name
= "GNU C89";
1603 /* Set the C 99 standard (without GNU extensions if ISO). */
1605 set_std_c99 (int iso
)
1607 cpp_set_lang (parse_in
, iso
? CLK_STDC99
: CLK_GNUC99
);
1609 flag_no_nonansi_builtin
= iso
;
1615 lang_hooks
.name
= "GNU C99";
1618 /* Set the C 11 standard (without GNU extensions if ISO). */
1620 set_std_c11 (int iso
)
1622 cpp_set_lang (parse_in
, iso
? CLK_STDC11
: CLK_GNUC11
);
1624 flag_no_nonansi_builtin
= iso
;
1630 lang_hooks
.name
= "GNU C11";
1633 /* Set the C 17 standard (without GNU extensions if ISO). */
1635 set_std_c17 (int iso
)
1637 cpp_set_lang (parse_in
, iso
? CLK_STDC17
: CLK_GNUC17
);
1639 flag_no_nonansi_builtin
= iso
;
1645 lang_hooks
.name
= "GNU C17";
1648 /* Set the C 2X standard (without GNU extensions if ISO). */
1650 set_std_c2x (int iso
)
1652 cpp_set_lang (parse_in
, iso
? CLK_STDC2X
: CLK_GNUC2X
);
1654 flag_no_nonansi_builtin
= iso
;
1660 lang_hooks
.name
= "GNU C2X";
1664 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1666 set_std_cxx98 (int iso
)
1668 cpp_set_lang (parse_in
, iso
? CLK_CXX98
: CLK_GNUCXX
);
1669 flag_no_gnu_keywords
= iso
;
1670 flag_no_nonansi_builtin
= iso
;
1674 cxx_dialect
= cxx98
;
1675 lang_hooks
.name
= "GNU C++98";
1678 /* Set the C++ 2011 standard (without GNU extensions if ISO). */
1680 set_std_cxx11 (int iso
)
1682 cpp_set_lang (parse_in
, iso
? CLK_CXX11
: CLK_GNUCXX11
);
1683 flag_no_gnu_keywords
= iso
;
1684 flag_no_nonansi_builtin
= iso
;
1686 /* C++11 includes the C99 standard library. */
1689 cxx_dialect
= cxx11
;
1690 lang_hooks
.name
= "GNU C++11";
1693 /* Set the C++ 2014 standard (without GNU extensions if ISO). */
1695 set_std_cxx14 (int iso
)
1697 cpp_set_lang (parse_in
, iso
? CLK_CXX14
: CLK_GNUCXX14
);
1698 flag_no_gnu_keywords
= iso
;
1699 flag_no_nonansi_builtin
= iso
;
1701 /* C++14 includes the C99 standard library. */
1704 cxx_dialect
= cxx14
;
1705 lang_hooks
.name
= "GNU C++14";
1708 /* Set the C++ 2017 standard (without GNU extensions if ISO). */
1710 set_std_cxx17 (int iso
)
1712 cpp_set_lang (parse_in
, iso
? CLK_CXX17
: CLK_GNUCXX17
);
1713 flag_no_gnu_keywords
= iso
;
1714 flag_no_nonansi_builtin
= iso
;
1716 /* C++17 includes the C11 standard library. */
1720 cxx_dialect
= cxx17
;
1721 lang_hooks
.name
= "GNU C++17";
1724 /* Set the C++ 2020 standard (without GNU extensions if ISO). */
1726 set_std_cxx20 (int iso
)
1728 cpp_set_lang (parse_in
, iso
? CLK_CXX20
: CLK_GNUCXX20
);
1729 flag_no_gnu_keywords
= iso
;
1730 flag_no_nonansi_builtin
= iso
;
1732 /* C++17 includes the C11 standard library. */
1736 /* C++20 includes coroutines. */
1737 flag_coroutines
= true;
1738 cxx_dialect
= cxx20
;
1739 lang_hooks
.name
= "GNU C++20";
1742 /* Args to -d specify what to dump. Silently ignore
1743 unrecognized options; they may be aimed at toplev.c. */
1745 handle_OPT_d (const char *arg
)
1749 while ((c
= *arg
++) != '\0')
1752 case 'M': /* Dump macros only. */
1753 case 'N': /* Dump names. */
1754 case 'D': /* Dump definitions. */
1755 case 'U': /* Dump used macros. */
1756 flag_dump_macros
= c
;
1760 flag_dump_includes
= 1;