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;
507 case OPT_fexec_charset_
:
508 cpp_opts
->narrow_charset
= arg
;
511 case OPT_fwide_exec_charset_
:
512 cpp_opts
->wide_charset
= arg
;
515 case OPT_finput_charset_
:
516 cpp_opts
->input_charset
= arg
;
519 case OPT_ftemplate_depth_
:
520 max_tinst_depth
= value
;
523 case OPT_fvisibility_inlines_hidden
:
524 visibility_options
.inlines_hidden
= value
;
527 case OPT_femit_struct_debug_baseonly
:
528 set_struct_debug_option (&global_options
, loc
, "base");
531 case OPT_femit_struct_debug_reduced
:
532 set_struct_debug_option (&global_options
, loc
,
533 "dir:ord:sys,dir:gen:any,ind:base");
536 case OPT_femit_struct_debug_detailed_
:
537 set_struct_debug_option (&global_options
, loc
, arg
);
540 case OPT_fext_numeric_literals
:
541 cpp_opts
->ext_numeric_literals
= value
;
545 add_path (xstrdup (arg
), INC_AFTER
, 0, true);
550 defer_opt (code
, arg
);
562 add_path (xstrdup (arg
), INC_QUOTE
, 0, true);
570 add_path (xstrdup (arg
), INC_SYSTEM
, 0, true);
573 case OPT_iwithprefix
:
574 add_prefixed_path (arg
, INC_SYSTEM
);
577 case OPT_iwithprefixbefore
:
578 add_prefixed_path (arg
, INC_BRACKET
);
582 cpp_set_lang (parse_in
, CLK_ASM
);
583 cpp_opts
->dollars_in_ident
= false;
598 error ("output filename specified twice");
601 case OPT_print_objc_runtime_info
:
602 print_struct_values
= 1;
610 case OPT_std_gnu__98
:
611 if (!preprocessing_asm_p
)
612 set_std_cxx98 (code
== OPT_std_c__98
/* ISO */);
616 case OPT_std_gnu__11
:
617 if (!preprocessing_asm_p
)
618 set_std_cxx11 (code
== OPT_std_c__11
/* ISO */);
622 case OPT_std_gnu__14
:
623 if (!preprocessing_asm_p
)
624 set_std_cxx14 (code
== OPT_std_c__14
/* ISO */);
628 case OPT_std_gnu__17
:
629 if (!preprocessing_asm_p
)
630 set_std_cxx17 (code
== OPT_std_c__17
/* ISO */);
634 case OPT_std_gnu__20
:
635 if (!preprocessing_asm_p
)
636 set_std_cxx20 (code
== OPT_std_c__20
/* ISO */);
640 case OPT_std_iso9899_199409
:
641 if (!preprocessing_asm_p
)
642 set_std_c89 (code
== OPT_std_iso9899_199409
/* c94 */, true /* ISO */);
646 if (!preprocessing_asm_p
)
647 set_std_c89 (false /* c94 */, false /* ISO */);
651 if (!preprocessing_asm_p
)
652 set_std_c99 (true /* ISO */);
656 if (!preprocessing_asm_p
)
657 set_std_c99 (false /* ISO */);
661 if (!preprocessing_asm_p
)
662 set_std_c11 (true /* ISO */);
666 if (!preprocessing_asm_p
)
667 set_std_c11 (false /* ISO */);
671 if (!preprocessing_asm_p
)
672 set_std_c17 (true /* ISO */);
676 if (!preprocessing_asm_p
)
677 set_std_c17 (false /* ISO */);
681 if (!preprocessing_asm_p
)
682 set_std_c2x (true /* ISO */);
686 if (!preprocessing_asm_p
)
687 set_std_c2x (false /* ISO */);
691 cpp_opts
->trigraphs
= 1;
694 case OPT_traditional_cpp
:
695 cpp_opts
->traditional
= 1;
706 C_handle_option_auto (&global_options
, &global_options_set
,
708 c_family_lang_mask
, kind
,
709 loc
, handlers
, global_dc
);
713 ObjC_handle_option_auto (&global_options
, &global_options_set
,
715 c_family_lang_mask
, kind
,
716 loc
, handlers
, global_dc
);
720 CXX_handle_option_auto (&global_options
, &global_options_set
,
722 c_family_lang_mask
, kind
,
723 loc
, handlers
, global_dc
);
727 ObjCXX_handle_option_auto (&global_options
, &global_options_set
,
729 c_family_lang_mask
, kind
,
730 loc
, handlers
, global_dc
);
737 cpp_handle_option_auto (&global_options
, scode
, cpp_opts
);
741 /* Default implementation of TARGET_HANDLE_C_OPTION. */
744 default_handle_c_option (size_t code ATTRIBUTE_UNUSED
,
745 const char *arg ATTRIBUTE_UNUSED
,
746 int value ATTRIBUTE_UNUSED
)
751 /* Post-switch processing. */
753 c_common_post_options (const char **pfilename
)
755 struct cpp_callbacks
*cb
;
757 /* Canonicalize the input and output filenames. */
758 if (in_fnames
== NULL
)
760 in_fnames
= XNEWVEC (const char *, 1);
763 else if (strcmp (in_fnames
[0], "-") == 0)
766 error ("cannot use %<-%> as input filename for a precompiled header");
771 if (out_fname
== NULL
|| !strcmp (out_fname
, "-"))
774 if (cpp_opts
->deps
.style
== DEPS_NONE
)
775 check_deps_environment_vars ();
777 handle_deferred_opts ();
779 sanitize_cpp_opts ();
781 register_include_chains (parse_in
, sysroot
, iprefix
, imultilib
,
782 std_inc
, std_cxx_inc
&& c_dialect_cxx (), verbose
);
784 #ifdef C_COMMON_OVERRIDE_OPTIONS
785 /* Some machines may reject certain combinations of C
786 language-specific options. */
787 C_COMMON_OVERRIDE_OPTIONS
;
790 /* Excess precision other than "fast" requires front-end
792 if (c_dialect_cxx ())
794 if (flag_excess_precision
== EXCESS_PRECISION_STANDARD
)
795 sorry ("%<-fexcess-precision=standard%> for C++");
796 flag_excess_precision
= EXCESS_PRECISION_FAST
;
798 else if (flag_excess_precision
== EXCESS_PRECISION_DEFAULT
)
799 flag_excess_precision
= (flag_iso
? EXCESS_PRECISION_STANDARD
800 : EXCESS_PRECISION_FAST
);
802 /* ISO C restricts floating-point expression contraction to within
803 source-language expressions (-ffp-contract=on, currently an alias
804 for -ffp-contract=off). */
807 && (global_options_set
.x_flag_fp_contract_mode
808 == (enum fp_contract_mode
) 0)
809 && flag_unsafe_math_optimizations
== 0)
810 flag_fp_contract_mode
= FP_CONTRACT_OFF
;
812 /* If we are compiling C, and we are outside of a standards mode,
813 we can permit the new values from ISO/IEC TS 18661-3 for
814 FLT_EVAL_METHOD. Otherwise, we must restrict the possible values to
815 the set specified in ISO C99/C11. */
818 && (global_options_set
.x_flag_permitted_flt_eval_methods
819 == PERMITTED_FLT_EVAL_METHODS_DEFAULT
))
820 flag_permitted_flt_eval_methods
= PERMITTED_FLT_EVAL_METHODS_TS_18661
;
822 flag_permitted_flt_eval_methods
= PERMITTED_FLT_EVAL_METHODS_C11
;
824 /* C2X Annex F does not permit certain built-in functions to raise
827 SET_OPTION_IF_UNSET (&global_options
, &global_options_set
,
828 flag_fp_int_builtin_inexact
, 0);
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. */
846 SET_OPTION_IF_UNSET (&global_options
, &global_options_set
,
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 /* -Wold-style-definition is enabled by default for C2X. */
903 if (warn_old_style_definition
== -1)
904 warn_old_style_definition
= flag_isoc2x
;
906 /* -Wshift-overflow is enabled by default in C99 and C++11 modes. */
907 if (warn_shift_overflow
== -1)
908 warn_shift_overflow
= cxx_dialect
>= cxx11
|| flag_isoc99
;
910 /* -Wshift-negative-value is enabled by -Wextra in C99 and C++11 modes. */
911 if (warn_shift_negative_value
== -1)
912 warn_shift_negative_value
= (extra_warnings
913 && (cxx_dialect
>= cxx11
|| flag_isoc99
));
915 /* -Wregister is enabled by default in C++17. */
916 SET_OPTION_IF_UNSET (&global_options
, &global_options_set
, warn_register
,
917 cxx_dialect
>= cxx17
);
919 /* -Wcomma-subscript is enabled by default in C++20. */
920 SET_OPTION_IF_UNSET (&global_options
, &global_options_set
,
921 warn_comma_subscript
,
922 cxx_dialect
>= cxx20
&& warn_deprecated
);
924 /* -Wvolatile is enabled by default in C++20. */
925 SET_OPTION_IF_UNSET (&global_options
, &global_options_set
, warn_volatile
,
926 cxx_dialect
>= cxx20
&& warn_deprecated
);
928 /* -Wdeprecated-enum-enum-conversion is enabled by default in C++20. */
929 SET_OPTION_IF_UNSET (&global_options
, &global_options_set
,
930 warn_deprecated_enum_enum_conv
,
931 cxx_dialect
>= cxx20
&& warn_deprecated
);
933 /* -Wdeprecated-enum-float-conversion is enabled by default in C++20. */
934 SET_OPTION_IF_UNSET (&global_options
, &global_options_set
,
935 warn_deprecated_enum_float_conv
,
936 cxx_dialect
>= cxx20
&& warn_deprecated
);
938 /* Declone C++ 'structors if -Os. */
939 if (flag_declone_ctor_dtor
== -1)
940 flag_declone_ctor_dtor
= optimize_size
;
942 if (flag_abi_compat_version
== 1)
944 warning (0, "%<-fabi-compat-version=1%> is not supported, using =2");
945 flag_abi_compat_version
= 2;
948 /* Change flag_abi_version to be the actual current ABI level, for the
949 benefit of c_cpp_builtins, and to make comparison simpler. */
950 const int latest_abi_version
= 14;
951 /* Generate compatibility aliases for ABI v11 (7.1) by default. */
952 const int abi_compat_default
= 11;
954 #define clamp(X) if (X == 0 || X > latest_abi_version) X = latest_abi_version
955 clamp (flag_abi_version
);
956 clamp (warn_abi_version
);
957 clamp (flag_abi_compat_version
);
960 /* Default -Wabi= or -fabi-compat-version= from each other. */
961 if (warn_abi_version
== -1 && flag_abi_compat_version
!= -1)
962 warn_abi_version
= flag_abi_compat_version
;
963 else if (flag_abi_compat_version
== -1 && warn_abi_version
!= -1)
964 flag_abi_compat_version
= warn_abi_version
;
965 else if (warn_abi_version
== -1 && flag_abi_compat_version
== -1)
967 warn_abi_version
= latest_abi_version
;
968 if (flag_abi_version
== latest_abi_version
)
970 auto_diagnostic_group d
;
971 if (warning (OPT_Wabi
, "%<-Wabi%> won%'t warn about anything"))
973 inform (input_location
, "%<-Wabi%> warns about differences "
974 "from the most up-to-date ABI, which is also used "
976 inform (input_location
, "use e.g. %<-Wabi=11%> to warn about "
977 "changes from GCC 7");
979 flag_abi_compat_version
= abi_compat_default
;
982 flag_abi_compat_version
= latest_abi_version
;
985 /* By default, enable the new inheriting constructor semantics along with ABI
986 11. New and old should coexist fine, but it is a change in what
987 artificial symbols are generated. */
988 SET_OPTION_IF_UNSET (&global_options
, &global_options_set
,
989 flag_new_inheriting_ctors
,
990 abi_version_at_least (11));
992 /* For GCC 7, only enable DR150 resolution by default if -std=c++17. */
993 SET_OPTION_IF_UNSET (&global_options
, &global_options_set
, flag_new_ttp
,
994 cxx_dialect
>= cxx17
);
996 /* C++11 guarantees forward progress. */
997 SET_OPTION_IF_UNSET (&global_options
, &global_options_set
, flag_finite_loops
,
998 optimize
>= 2 && cxx_dialect
>= cxx11
);
1000 if (cxx_dialect
>= cxx11
)
1002 /* If we're allowing C++0x constructs, don't warn about C++98
1003 identifiers which are keywords in C++0x. */
1004 warn_cxx11_compat
= 0;
1005 cpp_opts
->cpp_warn_cxx11_compat
= 0;
1007 if (warn_narrowing
== -1)
1010 /* Unless -f{,no-}ext-numeric-literals has been used explicitly,
1011 for -std=c++{11,14,17,2a} default to -fno-ext-numeric-literals. */
1012 if (flag_iso
&& !global_options_set
.x_flag_ext_numeric_literals
)
1013 cpp_opts
->ext_numeric_literals
= 0;
1015 else if (warn_narrowing
== -1)
1018 /* C++17 has stricter evaluation order requirements; let's use some of them
1019 for earlier C++ as well, so chaining works as expected. */
1020 if (c_dialect_cxx ()
1021 && flag_strong_eval_order
== -1)
1022 flag_strong_eval_order
= (cxx_dialect
>= cxx17
? 2 : 1);
1024 /* Global sized deallocation is new in C++14. */
1025 if (flag_sized_deallocation
== -1)
1026 flag_sized_deallocation
= (cxx_dialect
>= cxx14
);
1028 /* char8_t support is new in C++20. */
1029 if (flag_char8_t
== -1)
1030 flag_char8_t
= (cxx_dialect
>= cxx20
);
1032 if (flag_extern_tls_init
)
1034 if (!TARGET_SUPPORTS_ALIASES
|| !SUPPORTS_WEAK
)
1036 /* Lazy TLS initialization for a variable in another TU requires
1037 alias and weak reference support. */
1038 if (flag_extern_tls_init
> 0)
1039 sorry ("external TLS initialization functions not supported "
1042 flag_extern_tls_init
= 0;
1045 flag_extern_tls_init
= 1;
1048 /* Enable by default only for C++ and C++ with ObjC extensions. */
1049 if (warn_return_type
== -1 && c_dialect_cxx ())
1050 warn_return_type
= 1;
1052 /* C++20 is the final version of concepts. We still use -fconcepts
1053 to know when concepts are enabled. Note that -fconcepts-ts can
1054 be used to include additional features, although modified to
1055 work with the standard. */
1056 if (cxx_dialect
>= cxx20
|| flag_concepts_ts
)
1058 else if (flag_concepts
)
1059 /* For -std=c++17 -fconcepts, imply -fconcepts-ts. */
1060 flag_concepts_ts
= 1;
1062 if (num_in_fnames
> 1)
1063 error ("too many filenames given; type %<%s %s%> for usage",
1064 progname
, "--help");
1066 if (flag_preprocess_only
)
1068 /* Open the output now. We must do so even if flag_no_output is
1069 on, because there may be other output than from the actual
1070 preprocessing (e.g. from -dM). */
1071 if (out_fname
[0] == '\0')
1072 out_stream
= stdout
;
1074 out_stream
= fopen (out_fname
, "w");
1076 if (out_stream
== NULL
)
1078 fatal_error (input_location
, "opening output file %s: %m", out_fname
);
1082 init_pp_output (out_stream
);
1088 /* When writing a PCH file, avoid reading some other PCH file,
1089 because the default address space slot then can't be used
1090 for the output PCH file. */
1093 c_common_no_more_pch ();
1094 /* Only -g0 and -gdwarf* are supported with PCH, for other
1095 debug formats we warn here and refuse to load any PCH files. */
1096 if (write_symbols
!= NO_DEBUG
&& write_symbols
!= DWARF2_DEBUG
)
1097 warning (OPT_Wdeprecated
,
1098 "the %qs debug format cannot be used with "
1099 "pre-compiled headers", debug_type_names
[write_symbols
]);
1101 else if (write_symbols
!= NO_DEBUG
&& write_symbols
!= DWARF2_DEBUG
)
1102 c_common_no_more_pch ();
1104 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1105 input_location
= UNKNOWN_LOCATION
;
1108 cb
= cpp_get_callbacks (parse_in
);
1109 cb
->file_change
= cb_file_change
;
1110 cb
->dir_change
= cb_dir_change
;
1111 cpp_post_options (parse_in
);
1112 init_global_opts_from_cpp (&global_options
, cpp_get_options (parse_in
));
1114 input_location
= UNKNOWN_LOCATION
;
1116 *pfilename
= this_input_filename
1117 = cpp_read_main_file (parse_in
, in_fnames
[0],
1118 /* We'll inject preamble pieces if this is
1119 not preprocessed. */
1120 !cpp_opts
->preprocessed
);
1122 /* Don't do any compilation or preprocessing if there is no input file. */
1123 if (this_input_filename
== NULL
)
1129 if (flag_working_directory
1130 && flag_preprocess_only
&& !flag_no_line_commands
)
1131 pp_dir_change (parse_in
, get_src_pwd ());
1133 /* Disable LTO output when outputting a precompiled header. */
1134 if (pch_file
&& flag_lto
)
1137 flag_generate_lto
= 0;
1140 return flag_preprocess_only
;
1143 /* Front end initialization common to C, ObjC and C++. */
1145 c_common_init (void)
1147 /* Set up preprocessor arithmetic. Must be done after call to
1148 c_common_nodes_and_builtins for type nodes to be good. */
1149 cpp_opts
->precision
= TYPE_PRECISION (intmax_type_node
);
1150 cpp_opts
->char_precision
= TYPE_PRECISION (char_type_node
);
1151 cpp_opts
->int_precision
= TYPE_PRECISION (integer_type_node
);
1152 cpp_opts
->wchar_precision
= TYPE_PRECISION (wchar_type_node
);
1153 cpp_opts
->unsigned_wchar
= TYPE_UNSIGNED (wchar_type_node
);
1154 cpp_opts
->bytes_big_endian
= BYTES_BIG_ENDIAN
;
1156 /* This can't happen until after wchar_precision and bytes_big_endian
1158 cpp_init_iconv (parse_in
);
1163 fputs ("Compiler executable checksum: ", stderr
);
1164 for (i
= 0; i
< 16; i
++)
1165 fprintf (stderr
, "%02x", executable_checksum
[i
]);
1166 putc ('\n', stderr
);
1169 /* Has to wait until now so that cpplib has its hash table. */
1172 if (flag_preprocess_only
)
1174 c_finish_options ();
1175 preprocess_file (parse_in
);
1182 /* Initialize the integrated preprocessor after debug output has been
1183 initialized; loop over each input file. */
1185 c_common_parse_file (void)
1192 c_finish_options ();
1193 /* Open the dump file to use for the original dump output
1194 here, to be used during parsing for the current file. */
1195 original_dump_file
= dump_begin (TDI_original
, &original_dump_flags
);
1200 /* And end the main input file, if the debug writer wants it */
1201 if (debug_hooks
->start_end_main_source_file
)
1202 (*debug_hooks
->end_source_file
) (0);
1203 if (++i
>= num_in_fnames
)
1205 cpp_undef_all (parse_in
);
1206 cpp_clear_file_cache (parse_in
);
1208 = cpp_read_main_file (parse_in
, in_fnames
[i
]);
1209 if (original_dump_file
)
1211 dump_end (TDI_original
, original_dump_file
);
1212 original_dump_file
= NULL
;
1214 /* If an input file is missing, abandon further compilation.
1215 cpplib has issued a diagnostic. */
1216 if (!this_input_filename
)
1220 c_parse_final_cleanups ();
1223 /* Returns the appropriate dump file for PHASE to dump with FLAGS. */
1226 get_dump_info (int phase
, dump_flags_t
*flags
)
1228 gcc_assert (phase
== TDI_original
);
1230 *flags
= original_dump_flags
;
1231 return original_dump_file
;
1234 /* Common finish hook for the C, ObjC and C++ front ends. */
1236 c_common_finish (void)
1238 FILE *deps_stream
= NULL
;
1240 /* Note that we write the dependencies even if there are errors. This is
1241 useful for handling outdated generated headers that now trigger errors
1242 (for example, with #error) which would be resolved by re-generating
1243 them. In a sense, this complements -MG. */
1244 if (cpp_opts
->deps
.style
!= DEPS_NONE
)
1246 /* If -M or -MM was seen without -MF, default output to the
1249 deps_stream
= out_stream
;
1250 else if (deps_file
[0] == '-' && deps_file
[1] == '\0')
1251 deps_stream
= stdout
;
1254 deps_stream
= fopen (deps_file
, deps_append
? "a": "w");
1256 fatal_error (input_location
, "opening dependency file %s: %m",
1261 /* For performance, avoid tearing down cpplib's internal structures
1262 with cpp_destroy (). */
1263 cpp_finish (parse_in
, deps_stream
);
1265 if (deps_stream
&& deps_stream
!= out_stream
&& deps_stream
!= stdout
1266 && (ferror (deps_stream
) || fclose (deps_stream
)))
1267 fatal_error (input_location
, "closing dependency file %s: %m", deps_file
);
1269 if (out_stream
&& (ferror (out_stream
) || fclose (out_stream
)))
1270 fatal_error (input_location
, "when writing output to %s: %m", out_fname
);
1273 /* Either of two environment variables can specify output of
1274 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1275 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1276 and DEPS_TARGET is the target to mention in the deps. They also
1277 result in dependency information being appended to the output file
1278 rather than overwriting it, and like Sun's compiler
1279 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1281 check_deps_environment_vars (void)
1285 spec
= getenv ("DEPENDENCIES_OUTPUT");
1287 cpp_opts
->deps
.style
= DEPS_USER
;
1290 spec
= getenv ("SUNPRO_DEPENDENCIES");
1293 cpp_opts
->deps
.style
= DEPS_SYSTEM
;
1294 cpp_opts
->deps
.ignore_main_file
= true;
1300 /* Find the space before the DEPS_TARGET, if there is one. */
1301 char *s
= strchr (spec
, ' ');
1304 /* Let the caller perform MAKE quoting. */
1305 defer_opt (OPT_MT
, s
+ 1);
1309 /* Command line -MF overrides environment variables and default. */
1318 /* Handle deferred command line switches. */
1320 handle_deferred_opts (void)
1322 /* Avoid allocating the deps buffer if we don't need it.
1323 (This flag may be true without there having been -MT or -MQ
1324 options, but we'll still need the deps buffer.) */
1328 if (mkdeps
*deps
= cpp_get_deps (parse_in
))
1329 for (unsigned i
= 0; i
< deferred_count
; i
++)
1331 struct deferred_opt
*opt
= &deferred_opts
[i
];
1333 if (opt
->code
== OPT_MT
|| opt
->code
== OPT_MQ
)
1334 deps_add_target (deps
, opt
->arg
, opt
->code
== OPT_MQ
);
1338 /* These settings are appropriate for GCC, but not necessarily so for
1339 cpplib as a library. */
1341 sanitize_cpp_opts (void)
1343 /* If we don't know what style of dependencies to output, complain
1344 if any other dependency switches have been given. */
1345 if (deps_seen
&& cpp_opts
->deps
.style
== DEPS_NONE
)
1346 error ("to generate dependencies you must specify either %<-M%> "
1349 /* -dM and dependencies suppress normal output; do it here so that
1350 the last -d[MDN] switch overrides earlier ones. */
1351 if (flag_dump_macros
== 'M')
1354 /* By default, -fdirectives-only implies -dD. This allows subsequent phases
1355 to perform proper macro expansion. */
1356 if (cpp_opts
->directives_only
&& !cpp_opts
->preprocessed
&& !flag_dump_macros
)
1357 flag_dump_macros
= 'D';
1359 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1360 -dM since at least glibc relies on -M -dM to work. */
1361 /* Also, flag_no_output implies flag_no_line_commands, always. */
1364 if (flag_dump_macros
!= 'M')
1365 flag_dump_macros
= 0;
1366 flag_dump_includes
= 0;
1367 flag_no_line_commands
= 1;
1369 else if (cpp_opts
->deps
.missing_files
)
1370 error ("%<-MG%> may only be used with %<-M%> or %<-MM%>");
1372 cpp_opts
->unsigned_char
= !flag_signed_char
;
1373 cpp_opts
->stdc_0_in_system_headers
= STDC_0_IN_SYSTEM_HEADERS
;
1375 /* Wlong-long is disabled by default. It is enabled by:
1376 [-Wpedantic | -Wtraditional] -std=[gnu|c]++98 ; or
1377 [-Wpedantic | -Wtraditional] -std=non-c99
1379 Either -Wlong-long or -Wno-long-long override any other settings.
1380 ??? These conditions should be handled in c.opt. */
1381 if (warn_long_long
== -1)
1383 warn_long_long
= ((pedantic
|| warn_traditional
)
1384 && (c_dialect_cxx () ? cxx_dialect
== cxx98
: !flag_isoc99
));
1385 cpp_opts
->cpp_warn_long_long
= warn_long_long
;
1388 /* If we're generating preprocessor output, emit current directory
1389 if explicitly requested or if debugging information is enabled.
1390 ??? Maybe we should only do it for debugging formats that
1391 actually output the current directory? */
1392 if (flag_working_directory
== -1)
1393 flag_working_directory
= (debug_info_level
!= DINFO_LEVEL_NONE
);
1395 if (warn_implicit_fallthrough
< 5)
1396 cpp_opts
->cpp_warn_implicit_fallthrough
= warn_implicit_fallthrough
;
1398 cpp_opts
->cpp_warn_implicit_fallthrough
= 0;
1400 if (cpp_opts
->directives_only
)
1402 if (cpp_warn_unused_macros
)
1403 error ("%<-fdirectives-only%> is incompatible "
1404 "with %<-Wunused-macros%>");
1405 if (cpp_opts
->traditional
)
1406 error ("%<-fdirectives-only%> is incompatible with %<-traditional%>");
1410 /* Add include path with a prefix at the front of its name. */
1412 add_prefixed_path (const char *suffix
, incpath_kind chain
)
1416 size_t prefix_len
, suffix_len
;
1418 suffix_len
= strlen (suffix
);
1419 prefix
= iprefix
? iprefix
: cpp_GCC_INCLUDE_DIR
;
1420 prefix_len
= iprefix
? strlen (iprefix
) : cpp_GCC_INCLUDE_DIR_len
;
1422 path
= (char *) xmalloc (prefix_len
+ suffix_len
+ 1);
1423 memcpy (path
, prefix
, prefix_len
);
1424 memcpy (path
+ prefix_len
, suffix
, suffix_len
);
1425 path
[prefix_len
+ suffix_len
] = '\0';
1427 add_path (path
, chain
, 0, false);
1430 /* Handle -D, -U, -A, -imacros, and the first -include. */
1432 c_finish_options (void)
1434 if (!cpp_opts
->preprocessed
)
1436 const line_map_ordinary
*bltin_map
1437 = linemap_check_ordinary (linemap_add (line_table
, LC_RENAME
, 0,
1438 _("<built-in>"), 0));
1439 cb_file_change (parse_in
, bltin_map
);
1440 linemap_line_start (line_table
, 0, 1);
1442 /* Make sure all of the builtins about to be declared have
1443 BUILTINS_LOCATION has their location_t. */
1444 cpp_force_token_locations (parse_in
, BUILTINS_LOCATION
);
1446 cpp_init_builtins (parse_in
, flag_hosted
);
1447 c_cpp_builtins (parse_in
);
1449 /* We're about to send user input to cpplib, so make it warn for
1450 things that we previously (when we sent it internal definitions)
1451 told it to not warn.
1453 C99 permits implementation-defined characters in identifiers.
1454 The documented meaning of -std= is to turn off extensions that
1455 conflict with the specified standard, and since a strictly
1456 conforming program cannot contain a '$', we do not condition
1457 their acceptance on the -std= setting. */
1458 cpp_opts
->warn_dollars
= (cpp_opts
->cpp_pedantic
&& !cpp_opts
->c99
);
1460 const line_map_ordinary
*cmd_map
1461 = linemap_check_ordinary (linemap_add (line_table
, LC_RENAME
, 0,
1462 _("<command-line>"), 0));
1463 cb_file_change (parse_in
, cmd_map
);
1464 linemap_line_start (line_table
, 0, 1);
1466 /* All command line defines must have the same location. */
1467 cpp_force_token_locations (parse_in
, line_table
->highest_line
);
1468 for (size_t i
= 0; i
< deferred_count
; i
++)
1470 struct deferred_opt
*opt
= &deferred_opts
[i
];
1472 if (opt
->code
== OPT_D
)
1473 cpp_define (parse_in
, opt
->arg
);
1474 else if (opt
->code
== OPT_U
)
1475 cpp_undef (parse_in
, opt
->arg
);
1476 else if (opt
->code
== OPT_A
)
1478 if (opt
->arg
[0] == '-')
1479 cpp_unassert (parse_in
, opt
->arg
+ 1);
1481 cpp_assert (parse_in
, opt
->arg
);
1485 cpp_stop_forcing_token_locations (parse_in
);
1487 else if (cpp_opts
->directives_only
)
1488 cpp_init_special_builtins (parse_in
);
1490 /* Start the main input file, if the debug writer wants it. */
1491 if (debug_hooks
->start_end_main_source_file
1492 && !flag_preprocess_only
)
1493 (*debug_hooks
->start_source_file
) (0, this_input_filename
);
1495 if (!cpp_opts
->preprocessed
)
1496 /* Handle -imacros after -D and -U. */
1497 for (size_t i
= 0; i
< deferred_count
; i
++)
1499 struct deferred_opt
*opt
= &deferred_opts
[i
];
1501 if (opt
->code
== OPT_imacros
1502 && cpp_push_include (parse_in
, opt
->arg
))
1504 /* Disable push_command_line_include callback for now. */
1505 include_cursor
= deferred_count
+ 1;
1506 cpp_scan_nooutput (parse_in
);
1511 push_command_line_include ();
1514 /* Give CPP the next file given by -include, if any. */
1516 push_command_line_include (void)
1518 /* This can happen if disabled by -imacros for example.
1519 Punt so that we don't set "<command-line>" as the filename for
1521 if (include_cursor
> deferred_count
)
1524 if (!done_preinclude
)
1526 done_preinclude
= true;
1527 if (flag_hosted
&& std_inc
&& !cpp_opts
->preprocessed
)
1529 const char *preinc
= targetcm
.c_preinclude ();
1530 if (preinc
&& cpp_push_default_include (parse_in
, preinc
))
1535 pch_cpp_save_state ();
1537 while (include_cursor
< deferred_count
)
1539 struct deferred_opt
*opt
= &deferred_opts
[include_cursor
++];
1541 if (!cpp_opts
->preprocessed
&& opt
->code
== OPT_include
1542 && cpp_push_include (parse_in
, opt
->arg
))
1546 if (include_cursor
== deferred_count
)
1549 /* -Wunused-macros should only warn about macros defined hereafter. */
1550 cpp_opts
->warn_unused_macros
= cpp_warn_unused_macros
;
1551 /* Restore the line map back to the main file. */
1552 if (!cpp_opts
->preprocessed
)
1553 cpp_change_file (parse_in
, LC_RENAME
, this_input_filename
);
1555 /* Set this here so the client can change the option if it wishes,
1556 and after stacking the main file so we don't trace the main file. */
1557 line_table
->trace_includes
= cpp_opts
->print_include_names
;
1561 /* File change callback. Has to handle -include files. */
1563 cb_file_change (cpp_reader
* ARG_UNUSED (pfile
),
1564 const line_map_ordinary
*new_map
)
1566 if (flag_preprocess_only
)
1567 pp_file_change (new_map
);
1569 fe_file_change (new_map
);
1572 && (new_map
->reason
== LC_ENTER
|| new_map
->reason
== LC_RENAME
))
1574 /* Signal to plugins that a file is included. This could happen
1575 several times with the same file path, e.g. because of
1576 several '#include' or '#line' directives... */
1577 invoke_plugin_callbacks
1578 (PLUGIN_INCLUDE_FILE
,
1579 const_cast<char*> (ORDINARY_MAP_FILE_NAME (new_map
)));
1582 if (new_map
== 0 || (new_map
->reason
== LC_LEAVE
&& MAIN_FILE_P (new_map
)))
1584 pch_cpp_save_state ();
1585 push_command_line_include ();
1590 cb_dir_change (cpp_reader
* ARG_UNUSED (pfile
), const char *dir
)
1592 if (!set_src_pwd (dir
))
1593 warning (0, "too late for # directive to set debug directory");
1596 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1597 extensions if ISO). There is no concept of gnu94. */
1599 set_std_c89 (int c94
, int iso
)
1601 cpp_set_lang (parse_in
, c94
? CLK_STDC94
: iso
? CLK_STDC89
: CLK_GNUC89
);
1604 flag_no_gnu_keywords
= iso
;
1605 flag_no_nonansi_builtin
= iso
;
1610 lang_hooks
.name
= "GNU C89";
1613 /* Set the C 99 standard (without GNU extensions if ISO). */
1615 set_std_c99 (int iso
)
1617 cpp_set_lang (parse_in
, iso
? CLK_STDC99
: CLK_GNUC99
);
1619 flag_no_nonansi_builtin
= iso
;
1625 lang_hooks
.name
= "GNU C99";
1628 /* Set the C 11 standard (without GNU extensions if ISO). */
1630 set_std_c11 (int iso
)
1632 cpp_set_lang (parse_in
, iso
? CLK_STDC11
: CLK_GNUC11
);
1634 flag_no_nonansi_builtin
= iso
;
1640 lang_hooks
.name
= "GNU C11";
1643 /* Set the C 17 standard (without GNU extensions if ISO). */
1645 set_std_c17 (int iso
)
1647 cpp_set_lang (parse_in
, iso
? CLK_STDC17
: CLK_GNUC17
);
1649 flag_no_nonansi_builtin
= iso
;
1655 lang_hooks
.name
= "GNU C17";
1658 /* Set the C 2X standard (without GNU extensions if ISO). */
1660 set_std_c2x (int iso
)
1662 cpp_set_lang (parse_in
, iso
? CLK_STDC2X
: CLK_GNUC2X
);
1664 flag_no_nonansi_builtin
= iso
;
1670 lang_hooks
.name
= "GNU C2X";
1674 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1676 set_std_cxx98 (int iso
)
1678 cpp_set_lang (parse_in
, iso
? CLK_CXX98
: CLK_GNUCXX
);
1679 flag_no_gnu_keywords
= iso
;
1680 flag_no_nonansi_builtin
= iso
;
1684 cxx_dialect
= cxx98
;
1685 lang_hooks
.name
= "GNU C++98";
1688 /* Set the C++ 2011 standard (without GNU extensions if ISO). */
1690 set_std_cxx11 (int iso
)
1692 cpp_set_lang (parse_in
, iso
? CLK_CXX11
: CLK_GNUCXX11
);
1693 flag_no_gnu_keywords
= iso
;
1694 flag_no_nonansi_builtin
= iso
;
1696 /* C++11 includes the C99 standard library. */
1699 cxx_dialect
= cxx11
;
1700 lang_hooks
.name
= "GNU C++11";
1703 /* Set the C++ 2014 standard (without GNU extensions if ISO). */
1705 set_std_cxx14 (int iso
)
1707 cpp_set_lang (parse_in
, iso
? CLK_CXX14
: CLK_GNUCXX14
);
1708 flag_no_gnu_keywords
= iso
;
1709 flag_no_nonansi_builtin
= iso
;
1711 /* C++14 includes the C99 standard library. */
1714 cxx_dialect
= cxx14
;
1715 lang_hooks
.name
= "GNU C++14";
1718 /* Set the C++ 2017 standard (without GNU extensions if ISO). */
1720 set_std_cxx17 (int iso
)
1722 cpp_set_lang (parse_in
, iso
? CLK_CXX17
: CLK_GNUCXX17
);
1723 flag_no_gnu_keywords
= iso
;
1724 flag_no_nonansi_builtin
= iso
;
1726 /* C++17 includes the C11 standard library. */
1730 cxx_dialect
= cxx17
;
1731 lang_hooks
.name
= "GNU C++17";
1734 /* Set the C++ 2020 standard (without GNU extensions if ISO). */
1736 set_std_cxx20 (int iso
)
1738 cpp_set_lang (parse_in
, iso
? CLK_CXX20
: CLK_GNUCXX20
);
1739 flag_no_gnu_keywords
= iso
;
1740 flag_no_nonansi_builtin
= iso
;
1742 /* C++17 includes the C11 standard library. */
1746 /* C++20 includes coroutines. */
1747 flag_coroutines
= true;
1748 cxx_dialect
= cxx20
;
1749 lang_hooks
.name
= "GNU C++20";
1752 /* Args to -d specify what to dump. Silently ignore
1753 unrecognized options; they may be aimed at toplev.c. */
1755 handle_OPT_d (const char *arg
)
1759 while ((c
= *arg
++) != '\0')
1762 case 'M': /* Dump macros only. */
1763 case 'N': /* Dump names. */
1764 case 'D': /* Dump definitions. */
1765 case 'U': /* Dump used macros. */
1766 flag_dump_macros
= c
;
1770 flag_dump_includes
= 1;