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 char *saved_prefix
= pp_take_prefix (context
->printer
);
172 pp_set_prefix (context
->printer
, NULL
);
173 diagnostic_show_locus (context
, diagnostic
->richloc
, diagnostic
->kind
);
174 /* By default print macro expansion contexts in the diagnostic
175 finalizer -- for tokens resulting from macro expansion. */
176 virt_loc_aware_diagnostic_finalizer (context
, diagnostic
);
177 pp_set_prefix (context
->printer
, saved_prefix
);
178 pp_flush (context
->printer
);
181 /* Common default settings for diagnostics. */
183 c_common_diagnostics_set_defaults (diagnostic_context
*context
)
185 diagnostic_finalizer (context
) = c_diagnostic_finalizer
;
186 context
->opt_permissive
= OPT_fpermissive
;
189 /* Whether options from all C-family languages should be accepted
191 static bool accept_all_c_family_options
= false;
193 /* Return whether to complain about a wrong-language option. */
195 c_common_complain_wrong_lang_p (const struct cl_option
*option
)
197 if (accept_all_c_family_options
198 && (option
->flags
& c_family_lang_mask
))
204 /* Initialize options structure OPTS. */
206 c_common_init_options_struct (struct gcc_options
*opts
)
208 opts
->x_flag_exceptions
= c_dialect_cxx ();
209 opts
->x_warn_pointer_arith
= c_dialect_cxx ();
210 opts
->x_warn_write_strings
= c_dialect_cxx ();
211 opts
->x_flag_warn_unused_result
= true;
213 /* By default, C99-like requirements for complex multiply and divide. */
214 opts
->x_flag_complex_method
= 2;
217 /* Common initialization before calling option handlers. */
219 c_common_init_options (unsigned int decoded_options_count
,
220 struct cl_decoded_option
*decoded_options
)
223 struct cpp_callbacks
*cb
;
226 = new (ggc_alloc
<string_concat_db
> ()) string_concat_db ();
228 parse_in
= cpp_create_reader (c_dialect_cxx () ? CLK_GNUCXX
: CLK_GNUC89
,
229 ident_hash
, line_table
);
230 cb
= cpp_get_callbacks (parse_in
);
231 cb
->diagnostic
= c_cpp_diagnostic
;
233 cpp_opts
= cpp_get_options (parse_in
);
234 cpp_opts
->dollars_in_ident
= DOLLARS_IN_IDENTIFIERS
;
235 cpp_opts
->objc
= c_dialect_objc ();
237 /* Reset to avoid warnings on internal definitions. We set it just
238 before passing on command-line options to cpplib. */
239 cpp_opts
->warn_dollars
= 0;
241 deferred_opts
= XNEWVEC (struct deferred_opt
, decoded_options_count
);
243 if (c_language
== clk_c
)
245 /* The default for C is gnu17. */
246 set_std_c17 (false /* ISO */);
248 /* If preprocessing assembly language, accept any of the C-family
249 front end options since the driver may pass them through. */
250 for (i
= 1; i
< decoded_options_count
; i
++)
251 if (decoded_options
[i
].opt_index
== OPT_lang_asm
)
253 accept_all_c_family_options
= true;
258 /* Set C++ standard to C++14 if not specified on the command line. */
259 if (c_dialect_cxx ())
260 set_std_cxx14 (/*ISO*/false);
262 global_dc
->colorize_source_p
= true;
265 /* Handle switch SCODE with argument ARG. VALUE is true, unless no-
266 form of an -f or -W option was given. Returns false if the switch was
267 invalid, true if valid. Use HANDLERS in recursive handle_option calls. */
269 c_common_handle_option (size_t scode
, const char *arg
, HOST_WIDE_INT value
,
270 int kind
, location_t loc
,
271 const struct cl_option_handlers
*handlers
)
273 const struct cl_option
*option
= &cl_options
[scode
];
274 enum opt_code code
= (enum opt_code
) scode
;
277 /* Prevent resetting the language standard to a C dialect when the driver
278 has already determined that we're looking at assembler input. */
279 bool preprocessing_asm_p
= (cpp_get_options (parse_in
)->lang
== CLK_ASM
);
284 if (cl_options
[code
].flags
& c_family_lang_mask
)
286 if ((option
->flags
& CL_TARGET
)
287 && ! targetcm
.handle_c_option (scode
, arg
, value
))
294 case OPT__output_pch_
:
299 defer_opt (code
, arg
);
303 cpp_opts
->discard_comments
= 0;
307 cpp_opts
->discard_comments
= 0;
308 cpp_opts
->discard_comments_in_macro_exp
= 0;
312 defer_opt (code
, arg
);
316 cpp_opts
->print_include_names
= 1;
320 TARGET_OPTF (xstrdup (arg
));
324 if (strcmp (arg
, "-"))
325 add_path (xstrdup (arg
), INC_BRACKET
, 0, true);
328 if (quote_chain_split
)
329 error ("%<-I-%> specified twice");
330 quote_chain_split
= true;
331 split_quote_chain ();
332 inform (input_location
, "obsolete option %<-I-%> used, "
333 "please use %<-iquote%> instead");
339 /* When doing dependencies with -M or -MM, suppress normal
340 preprocessed output, but still do -dM etc. as software
341 depends on this. Preprocessed output does occur if -MD, -MMD
342 or environment var dependency generation is used. */
343 cpp_opts
->deps
.style
= (code
== OPT_M
? DEPS_SYSTEM
: DEPS_USER
);
349 cpp_opts
->deps
.style
= (code
== OPT_MD
? DEPS_SYSTEM
: DEPS_USER
);
350 cpp_opts
->deps
.need_preprocessor_output
= true;
361 cpp_opts
->deps
.missing_files
= true;
366 cpp_opts
->deps
.phony_targets
= true;
372 defer_opt (code
, arg
);
376 flag_no_line_commands
= 1;
380 defer_opt (code
, arg
);
384 /* ??? Don't add new options here. Use LangEnabledBy in c.opt. */
386 cpp_opts
->warn_num_sign_change
= value
;
389 case OPT_Wunknown_pragmas
:
390 /* Set to greater than 1, so that even unknown pragmas in
391 system headers will be warned about. */
392 /* ??? There is no way to handle this automatically for now. */
393 warn_unknown_pragmas
= value
* 2;
397 if (!c_dialect_cxx ())
398 set_std_c89 (false, true);
400 set_std_cxx98 (true);
411 warning (0, "%<-Wabi=1%> is not supported, using =2");
414 warn_abi_version
= value
;
417 case OPT_fcanonical_system_headers
:
418 cpp_opts
->canonical_system_headers
= value
;
421 case OPT_fcond_mismatch
:
422 if (!c_dialect_cxx ())
424 flag_cond_mismatch
= value
;
427 warning (0, "switch %qs is no longer supported", option
->opt_text
);
434 disable_builtin_function (arg
);
437 case OPT_fdirectives_only
:
438 cpp_opts
->directives_only
= value
;
441 case OPT_fdollars_in_identifiers
:
442 cpp_opts
->dollars_in_ident
= value
;
445 case OPT_fmacro_prefix_map_
:
446 add_macro_prefix_map (arg
);
449 case OPT_ffreestanding
:
454 flag_no_builtin
= !value
;
457 case OPT_fconstant_string_class_
:
458 constant_string_class_name
= arg
;
461 case OPT_fextended_identifiers
:
462 cpp_opts
->extended_identifiers
= value
;
465 case OPT_fmax_include_depth_
:
466 cpp_opts
->max_include_depth
= value
;
469 case OPT_foperator_names
:
470 cpp_opts
->operator_names
= value
;
474 cpp_opts
->restore_pch_deps
= value
;
477 case OPT_fpch_preprocess
:
478 flag_pch_preprocess
= value
;
481 case OPT_fpermissive
:
482 flag_permissive
= value
;
483 global_dc
->permissive
= value
;
486 case OPT_fpreprocessed
:
487 cpp_opts
->preprocessed
= value
;
494 case OPT_ftrack_macro_expansion
:
499 case OPT_ftrack_macro_expansion_
:
500 if (arg
&& *arg
!= '\0')
501 cpp_opts
->track_macro_expansion
= value
;
503 cpp_opts
->track_macro_expansion
= 2;
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
== EXCESS_PRECISION_STANDARD
)
800 sorry ("%<-fexcess-precision=standard%> for C++");
801 flag_excess_precision
= EXCESS_PRECISION_FAST
;
803 else if (flag_excess_precision
== EXCESS_PRECISION_DEFAULT
)
804 flag_excess_precision
= (flag_iso
? EXCESS_PRECISION_STANDARD
805 : EXCESS_PRECISION_FAST
);
807 /* ISO C restricts floating-point expression contraction to within
808 source-language expressions (-ffp-contract=on, currently an alias
809 for -ffp-contract=off). */
812 && (global_options_set
.x_flag_fp_contract_mode
813 == (enum fp_contract_mode
) 0)
814 && flag_unsafe_math_optimizations
== 0)
815 flag_fp_contract_mode
= FP_CONTRACT_OFF
;
817 /* If we are compiling C, and we are outside of a standards mode,
818 we can permit the new values from ISO/IEC TS 18661-3 for
819 FLT_EVAL_METHOD. Otherwise, we must restrict the possible values to
820 the set specified in ISO C99/C11. */
823 && (global_options_set
.x_flag_permitted_flt_eval_methods
824 == PERMITTED_FLT_EVAL_METHODS_DEFAULT
))
825 flag_permitted_flt_eval_methods
= PERMITTED_FLT_EVAL_METHODS_TS_18661
;
827 flag_permitted_flt_eval_methods
= PERMITTED_FLT_EVAL_METHODS_C11
;
829 /* C2X Annex F does not permit certain built-in functions to raise
832 SET_OPTION_IF_UNSET (&global_options
, &global_options_set
,
833 flag_fp_int_builtin_inexact
, 0);
835 /* By default we use C99 inline semantics in GNU99 or C99 mode. C99
836 inline semantics are not supported in GNU89 or C89 mode. */
837 if (flag_gnu89_inline
== -1)
838 flag_gnu89_inline
= !flag_isoc99
;
839 else if (!flag_gnu89_inline
&& !flag_isoc99
)
840 error ("%<-fno-gnu89-inline%> is only supported in GNU99 or C99 mode");
842 /* Default to ObjC sjlj exception handling if NeXT runtime. */
843 if (flag_objc_sjlj_exceptions
< 0)
844 flag_objc_sjlj_exceptions
= flag_next_runtime
;
845 if (flag_objc_exceptions
&& !flag_objc_sjlj_exceptions
)
848 /* If -ffreestanding, -fno-hosted or -fno-builtin then disable
849 pattern recognition. */
851 SET_OPTION_IF_UNSET (&global_options
, &global_options_set
,
852 flag_tree_loop_distribute_patterns
, 0);
854 /* -Woverlength-strings is off by default, but is enabled by -Wpedantic.
855 It is never enabled in C++, as the minimum limit is not normative
857 if (c_dialect_cxx ())
858 warn_overlength_strings
= 0;
860 /* Wmain is enabled by default in C++ but not in C. */
861 /* Wmain is disabled by default for -ffreestanding (!flag_hosted),
862 even if -Wall or -Wpedantic was given (warn_main will be 2 if set
863 by -Wall, 1 if set by -Wmain). */
865 warn_main
= (c_dialect_cxx () && flag_hosted
) ? 1 : 0;
866 else if (warn_main
== 2)
867 warn_main
= flag_hosted
? 1 : 0;
869 /* In C, -Wall and -Wc++-compat enable -Wenum-compare; if it has not
870 yet been set, it is disabled by default. In C++, it is enabled
872 if (warn_enum_compare
== -1)
873 warn_enum_compare
= c_dialect_cxx () ? 1 : 0;
875 /* -Wpacked-bitfield-compat is on by default for the C languages. The
876 warning is issued in stor-layout.c which is not part of the front-end so
877 we need to selectively turn it on here. */
878 if (warn_packed_bitfield_compat
== -1)
879 warn_packed_bitfield_compat
= 1;
881 /* Special format checking options don't work without -Wformat; warn if
885 warning (OPT_Wformat_y2k
,
886 "%<-Wformat-y2k%> ignored without %<-Wformat%>");
887 warning (OPT_Wformat_extra_args
,
888 "%<-Wformat-extra-args%> ignored without %<-Wformat%>");
889 warning (OPT_Wformat_zero_length
,
890 "%<-Wformat-zero-length%> ignored without %<-Wformat%>");
891 warning (OPT_Wformat_nonliteral
,
892 "%<-Wformat-nonliteral%> ignored without %<-Wformat%>");
893 warning (OPT_Wformat_contains_nul
,
894 "%<-Wformat-contains-nul%> ignored without %<-Wformat%>");
895 warning (OPT_Wformat_security
,
896 "%<-Wformat-security%> ignored without %<-Wformat%>");
899 /* -Wimplicit-function-declaration is enabled by default for C99. */
900 if (warn_implicit_function_declaration
== -1)
901 warn_implicit_function_declaration
= flag_isoc99
;
903 /* -Wimplicit-int is enabled by default for C99. */
904 if (warn_implicit_int
== -1)
905 warn_implicit_int
= flag_isoc99
;
907 /* -Wold-style-definition is enabled by default for C2X. */
908 if (warn_old_style_definition
== -1)
909 warn_old_style_definition
= flag_isoc2x
;
911 /* -Wshift-overflow is enabled by default in C99 and C++11 modes. */
912 if (warn_shift_overflow
== -1)
913 warn_shift_overflow
= cxx_dialect
>= cxx11
|| flag_isoc99
;
915 /* -Wshift-negative-value is enabled by -Wextra in C99 and C++11 modes. */
916 if (warn_shift_negative_value
== -1)
917 warn_shift_negative_value
= (extra_warnings
918 && (cxx_dialect
>= cxx11
|| flag_isoc99
));
920 /* -Wregister is enabled by default in C++17. */
921 SET_OPTION_IF_UNSET (&global_options
, &global_options_set
, warn_register
,
922 cxx_dialect
>= cxx17
);
924 /* -Wcomma-subscript is enabled by default in C++20. */
925 SET_OPTION_IF_UNSET (&global_options
, &global_options_set
,
926 warn_comma_subscript
,
927 cxx_dialect
>= cxx2a
&& warn_deprecated
);
929 /* -Wvolatile is enabled by default in C++20. */
930 SET_OPTION_IF_UNSET (&global_options
, &global_options_set
, warn_volatile
,
931 cxx_dialect
>= cxx2a
&& warn_deprecated
);
933 /* Declone C++ 'structors if -Os. */
934 if (flag_declone_ctor_dtor
== -1)
935 flag_declone_ctor_dtor
= optimize_size
;
937 if (flag_abi_compat_version
== 1)
939 warning (0, "%<-fabi-compat-version=1%> is not supported, using =2");
940 flag_abi_compat_version
= 2;
943 /* Change flag_abi_version to be the actual current ABI level, for the
944 benefit of c_cpp_builtins, and to make comparison simpler. */
945 const int latest_abi_version
= 14;
946 /* Generate compatibility aliases for ABI v11 (7.1) by default. */
947 const int abi_compat_default
= 11;
949 #define clamp(X) if (X == 0 || X > latest_abi_version) X = latest_abi_version
950 clamp (flag_abi_version
);
951 clamp (warn_abi_version
);
952 clamp (flag_abi_compat_version
);
955 /* Default -Wabi= or -fabi-compat-version= from each other. */
956 if (warn_abi_version
== -1 && flag_abi_compat_version
!= -1)
957 warn_abi_version
= flag_abi_compat_version
;
958 else if (flag_abi_compat_version
== -1 && warn_abi_version
!= -1)
959 flag_abi_compat_version
= warn_abi_version
;
960 else if (warn_abi_version
== -1 && flag_abi_compat_version
== -1)
962 warn_abi_version
= latest_abi_version
;
963 if (flag_abi_version
== latest_abi_version
)
965 auto_diagnostic_group d
;
966 if (warning (OPT_Wabi
, "%<-Wabi%> won%'t warn about anything"))
968 inform (input_location
, "%<-Wabi%> warns about differences "
969 "from the most up-to-date ABI, which is also used "
971 inform (input_location
, "use e.g. %<-Wabi=11%> to warn about "
972 "changes from GCC 7");
974 flag_abi_compat_version
= abi_compat_default
;
977 flag_abi_compat_version
= latest_abi_version
;
980 /* By default, enable the new inheriting constructor semantics along with ABI
981 11. New and old should coexist fine, but it is a change in what
982 artificial symbols are generated. */
983 SET_OPTION_IF_UNSET (&global_options
, &global_options_set
,
984 flag_new_inheriting_ctors
,
985 abi_version_at_least (11));
987 /* For GCC 7, only enable DR150 resolution by default if -std=c++17. */
988 SET_OPTION_IF_UNSET (&global_options
, &global_options_set
, flag_new_ttp
,
989 cxx_dialect
>= cxx17
);
991 if (cxx_dialect
>= cxx11
)
993 /* If we're allowing C++0x constructs, don't warn about C++98
994 identifiers which are keywords in C++0x. */
995 warn_cxx11_compat
= 0;
996 cpp_opts
->cpp_warn_cxx11_compat
= 0;
998 if (warn_narrowing
== -1)
1001 /* Unless -f{,no-}ext-numeric-literals has been used explicitly,
1002 for -std=c++{11,14,17,2a} default to -fno-ext-numeric-literals. */
1003 if (flag_iso
&& !global_options_set
.x_flag_ext_numeric_literals
)
1004 cpp_opts
->ext_numeric_literals
= 0;
1006 else if (warn_narrowing
== -1)
1009 /* C++17 has stricter evaluation order requirements; let's use some of them
1010 for earlier C++ as well, so chaining works as expected. */
1011 if (c_dialect_cxx ()
1012 && flag_strong_eval_order
== -1)
1013 flag_strong_eval_order
= (cxx_dialect
>= cxx17
? 2 : 1);
1015 /* Global sized deallocation is new in C++14. */
1016 if (flag_sized_deallocation
== -1)
1017 flag_sized_deallocation
= (cxx_dialect
>= cxx14
);
1019 /* char8_t support is new in C++2A. */
1020 if (flag_char8_t
== -1)
1021 flag_char8_t
= (cxx_dialect
>= cxx2a
);
1023 if (flag_extern_tls_init
)
1025 if (!TARGET_SUPPORTS_ALIASES
|| !SUPPORTS_WEAK
)
1027 /* Lazy TLS initialization for a variable in another TU requires
1028 alias and weak reference support. */
1029 if (flag_extern_tls_init
> 0)
1030 sorry ("external TLS initialization functions not supported "
1033 flag_extern_tls_init
= 0;
1036 flag_extern_tls_init
= 1;
1039 /* Enable by default only for C++ and C++ with ObjC extensions. */
1040 if (warn_return_type
== -1 && c_dialect_cxx ())
1041 warn_return_type
= 1;
1043 /* C++2a is the final version of concepts. We still use -fconcepts
1044 to know when concepts are enabled. Note that -fconcepts-ts can
1045 be used to include additional features, although modified to
1046 work with the standard. */
1047 if (cxx_dialect
>= cxx2a
|| flag_concepts_ts
)
1049 else if (flag_concepts
)
1050 /* For -std=c++17 -fconcepts, imply -fconcepts-ts. */
1051 flag_concepts_ts
= 1;
1053 if (num_in_fnames
> 1)
1054 error ("too many filenames given; type %<%s %s%> for usage",
1055 progname
, "--help");
1057 if (flag_preprocess_only
)
1059 /* Open the output now. We must do so even if flag_no_output is
1060 on, because there may be other output than from the actual
1061 preprocessing (e.g. from -dM). */
1062 if (out_fname
[0] == '\0')
1063 out_stream
= stdout
;
1065 out_stream
= fopen (out_fname
, "w");
1067 if (out_stream
== NULL
)
1069 fatal_error (input_location
, "opening output file %s: %m", out_fname
);
1073 init_pp_output (out_stream
);
1079 /* When writing a PCH file, avoid reading some other PCH file,
1080 because the default address space slot then can't be used
1081 for the output PCH file. */
1084 c_common_no_more_pch ();
1085 /* Only -g0 and -gdwarf* are supported with PCH, for other
1086 debug formats we warn here and refuse to load any PCH files. */
1087 if (write_symbols
!= NO_DEBUG
&& write_symbols
!= DWARF2_DEBUG
)
1088 warning (OPT_Wdeprecated
,
1089 "the %qs debug format cannot be used with "
1090 "pre-compiled headers", debug_type_names
[write_symbols
]);
1092 else if (write_symbols
!= NO_DEBUG
&& write_symbols
!= DWARF2_DEBUG
)
1093 c_common_no_more_pch ();
1095 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1096 input_location
= UNKNOWN_LOCATION
;
1099 cb
= cpp_get_callbacks (parse_in
);
1100 cb
->file_change
= cb_file_change
;
1101 cb
->dir_change
= cb_dir_change
;
1102 cpp_post_options (parse_in
);
1103 init_global_opts_from_cpp (&global_options
, cpp_get_options (parse_in
));
1105 input_location
= UNKNOWN_LOCATION
;
1107 *pfilename
= this_input_filename
1108 = cpp_read_main_file (parse_in
, in_fnames
[0]);
1109 /* Don't do any compilation or preprocessing if there is no input file. */
1110 if (this_input_filename
== NULL
)
1116 if (flag_working_directory
1117 && flag_preprocess_only
&& !flag_no_line_commands
)
1118 pp_dir_change (parse_in
, get_src_pwd ());
1120 /* Disable LTO output when outputting a precompiled header. */
1121 if (pch_file
&& flag_lto
)
1124 flag_generate_lto
= 0;
1127 return flag_preprocess_only
;
1130 /* Front end initialization common to C, ObjC and C++. */
1132 c_common_init (void)
1134 /* Set up preprocessor arithmetic. Must be done after call to
1135 c_common_nodes_and_builtins for type nodes to be good. */
1136 cpp_opts
->precision
= TYPE_PRECISION (intmax_type_node
);
1137 cpp_opts
->char_precision
= TYPE_PRECISION (char_type_node
);
1138 cpp_opts
->int_precision
= TYPE_PRECISION (integer_type_node
);
1139 cpp_opts
->wchar_precision
= TYPE_PRECISION (wchar_type_node
);
1140 cpp_opts
->unsigned_wchar
= TYPE_UNSIGNED (wchar_type_node
);
1141 cpp_opts
->bytes_big_endian
= BYTES_BIG_ENDIAN
;
1143 /* This can't happen until after wchar_precision and bytes_big_endian
1145 cpp_init_iconv (parse_in
);
1150 fputs ("Compiler executable checksum: ", stderr
);
1151 for (i
= 0; i
< 16; i
++)
1152 fprintf (stderr
, "%02x", executable_checksum
[i
]);
1153 putc ('\n', stderr
);
1156 /* Has to wait until now so that cpplib has its hash table. */
1159 if (flag_preprocess_only
)
1161 c_finish_options ();
1162 preprocess_file (parse_in
);
1169 /* Initialize the integrated preprocessor after debug output has been
1170 initialized; loop over each input file. */
1172 c_common_parse_file (void)
1179 c_finish_options ();
1180 /* Open the dump file to use for the original dump output
1181 here, to be used during parsing for the current file. */
1182 original_dump_file
= dump_begin (TDI_original
, &original_dump_flags
);
1187 /* And end the main input file, if the debug writer wants it */
1188 if (debug_hooks
->start_end_main_source_file
)
1189 (*debug_hooks
->end_source_file
) (0);
1190 if (++i
>= num_in_fnames
)
1192 cpp_undef_all (parse_in
);
1193 cpp_clear_file_cache (parse_in
);
1195 = cpp_read_main_file (parse_in
, in_fnames
[i
]);
1196 if (original_dump_file
)
1198 dump_end (TDI_original
, original_dump_file
);
1199 original_dump_file
= NULL
;
1201 /* If an input file is missing, abandon further compilation.
1202 cpplib has issued a diagnostic. */
1203 if (!this_input_filename
)
1207 c_parse_final_cleanups ();
1210 /* Returns the appropriate dump file for PHASE to dump with FLAGS. */
1213 get_dump_info (int phase
, dump_flags_t
*flags
)
1215 gcc_assert (phase
== TDI_original
);
1217 *flags
= original_dump_flags
;
1218 return original_dump_file
;
1221 /* Common finish hook for the C, ObjC and C++ front ends. */
1223 c_common_finish (void)
1225 FILE *deps_stream
= NULL
;
1227 /* Note that we write the dependencies even if there are errors. This is
1228 useful for handling outdated generated headers that now trigger errors
1229 (for example, with #error) which would be resolved by re-generating
1230 them. In a sense, this complements -MG. */
1231 if (cpp_opts
->deps
.style
!= DEPS_NONE
)
1233 /* If -M or -MM was seen without -MF, default output to the
1236 deps_stream
= out_stream
;
1237 else if (deps_file
[0] == '-' && deps_file
[1] == '\0')
1238 deps_stream
= stdout
;
1241 deps_stream
= fopen (deps_file
, deps_append
? "a": "w");
1243 fatal_error (input_location
, "opening dependency file %s: %m",
1248 /* For performance, avoid tearing down cpplib's internal structures
1249 with cpp_destroy (). */
1250 cpp_finish (parse_in
, deps_stream
);
1252 if (deps_stream
&& deps_stream
!= out_stream
&& deps_stream
!= stdout
1253 && (ferror (deps_stream
) || fclose (deps_stream
)))
1254 fatal_error (input_location
, "closing dependency file %s: %m", deps_file
);
1256 if (out_stream
&& (ferror (out_stream
) || fclose (out_stream
)))
1257 fatal_error (input_location
, "when writing output to %s: %m", out_fname
);
1260 /* Either of two environment variables can specify output of
1261 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1262 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1263 and DEPS_TARGET is the target to mention in the deps. They also
1264 result in dependency information being appended to the output file
1265 rather than overwriting it, and like Sun's compiler
1266 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1268 check_deps_environment_vars (void)
1272 spec
= getenv ("DEPENDENCIES_OUTPUT");
1274 cpp_opts
->deps
.style
= DEPS_USER
;
1277 spec
= getenv ("SUNPRO_DEPENDENCIES");
1280 cpp_opts
->deps
.style
= DEPS_SYSTEM
;
1281 cpp_opts
->deps
.ignore_main_file
= true;
1287 /* Find the space before the DEPS_TARGET, if there is one. */
1288 char *s
= strchr (spec
, ' ');
1291 /* Let the caller perform MAKE quoting. */
1292 defer_opt (OPT_MT
, s
+ 1);
1296 /* Command line -MF overrides environment variables and default. */
1305 /* Handle deferred command line switches. */
1307 handle_deferred_opts (void)
1309 /* Avoid allocating the deps buffer if we don't need it.
1310 (This flag may be true without there having been -MT or -MQ
1311 options, but we'll still need the deps buffer.) */
1315 mkdeps
*deps
= cpp_get_deps (parse_in
);
1317 for (size_t i
= 0; i
< deferred_count
; i
++)
1319 struct deferred_opt
*opt
= &deferred_opts
[i
];
1321 if (opt
->code
== OPT_MT
|| opt
->code
== OPT_MQ
)
1322 deps_add_target (deps
, opt
->arg
, opt
->code
== OPT_MQ
);
1326 /* These settings are appropriate for GCC, but not necessarily so for
1327 cpplib as a library. */
1329 sanitize_cpp_opts (void)
1331 /* If we don't know what style of dependencies to output, complain
1332 if any other dependency switches have been given. */
1333 if (deps_seen
&& cpp_opts
->deps
.style
== DEPS_NONE
)
1334 error ("to generate dependencies you must specify either %<-M%> "
1337 /* -dM and dependencies suppress normal output; do it here so that
1338 the last -d[MDN] switch overrides earlier ones. */
1339 if (flag_dump_macros
== 'M')
1342 /* By default, -fdirectives-only implies -dD. This allows subsequent phases
1343 to perform proper macro expansion. */
1344 if (cpp_opts
->directives_only
&& !cpp_opts
->preprocessed
&& !flag_dump_macros
)
1345 flag_dump_macros
= 'D';
1347 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1348 -dM since at least glibc relies on -M -dM to work. */
1349 /* Also, flag_no_output implies flag_no_line_commands, always. */
1352 if (flag_dump_macros
!= 'M')
1353 flag_dump_macros
= 0;
1354 flag_dump_includes
= 0;
1355 flag_no_line_commands
= 1;
1357 else if (cpp_opts
->deps
.missing_files
)
1358 error ("%<-MG%> may only be used with %<-M%> or %<-MM%>");
1360 cpp_opts
->unsigned_char
= !flag_signed_char
;
1361 cpp_opts
->stdc_0_in_system_headers
= STDC_0_IN_SYSTEM_HEADERS
;
1363 /* Wlong-long is disabled by default. It is enabled by:
1364 [-Wpedantic | -Wtraditional] -std=[gnu|c]++98 ; or
1365 [-Wpedantic | -Wtraditional] -std=non-c99
1367 Either -Wlong-long or -Wno-long-long override any other settings.
1368 ??? These conditions should be handled in c.opt. */
1369 if (warn_long_long
== -1)
1371 warn_long_long
= ((pedantic
|| warn_traditional
)
1372 && (c_dialect_cxx () ? cxx_dialect
== cxx98
: !flag_isoc99
));
1373 cpp_opts
->cpp_warn_long_long
= warn_long_long
;
1376 /* If we're generating preprocessor output, emit current directory
1377 if explicitly requested or if debugging information is enabled.
1378 ??? Maybe we should only do it for debugging formats that
1379 actually output the current directory? */
1380 if (flag_working_directory
== -1)
1381 flag_working_directory
= (debug_info_level
!= DINFO_LEVEL_NONE
);
1383 if (warn_implicit_fallthrough
< 5)
1384 cpp_opts
->cpp_warn_implicit_fallthrough
= warn_implicit_fallthrough
;
1386 cpp_opts
->cpp_warn_implicit_fallthrough
= 0;
1388 if (cpp_opts
->directives_only
)
1390 if (cpp_warn_unused_macros
)
1391 error ("%<-fdirectives-only%> is incompatible "
1392 "with %<-Wunused-macros%>");
1393 if (cpp_opts
->traditional
)
1394 error ("%<-fdirectives-only%> is incompatible with %<-traditional%>");
1398 /* Add include path with a prefix at the front of its name. */
1400 add_prefixed_path (const char *suffix
, incpath_kind chain
)
1404 size_t prefix_len
, suffix_len
;
1406 suffix_len
= strlen (suffix
);
1407 prefix
= iprefix
? iprefix
: cpp_GCC_INCLUDE_DIR
;
1408 prefix_len
= iprefix
? strlen (iprefix
) : cpp_GCC_INCLUDE_DIR_len
;
1410 path
= (char *) xmalloc (prefix_len
+ suffix_len
+ 1);
1411 memcpy (path
, prefix
, prefix_len
);
1412 memcpy (path
+ prefix_len
, suffix
, suffix_len
);
1413 path
[prefix_len
+ suffix_len
] = '\0';
1415 add_path (path
, chain
, 0, false);
1418 /* Handle -D, -U, -A, -imacros, and the first -include. */
1420 c_finish_options (void)
1422 if (!cpp_opts
->preprocessed
)
1424 const line_map_ordinary
*bltin_map
1425 = linemap_check_ordinary (linemap_add (line_table
, LC_RENAME
, 0,
1426 _("<built-in>"), 0));
1427 cb_file_change (parse_in
, bltin_map
);
1429 /* Make sure all of the builtins about to be declared have
1430 BUILTINS_LOCATION has their location_t. */
1431 cpp_force_token_locations (parse_in
, BUILTINS_LOCATION
);
1433 cpp_init_builtins (parse_in
, flag_hosted
);
1434 c_cpp_builtins (parse_in
);
1436 /* We're about to send user input to cpplib, so make it warn for
1437 things that we previously (when we sent it internal definitions)
1438 told it to not warn.
1440 C99 permits implementation-defined characters in identifiers.
1441 The documented meaning of -std= is to turn off extensions that
1442 conflict with the specified standard, and since a strictly
1443 conforming program cannot contain a '$', we do not condition
1444 their acceptance on the -std= setting. */
1445 cpp_opts
->warn_dollars
= (cpp_opts
->cpp_pedantic
&& !cpp_opts
->c99
);
1447 const line_map_ordinary
*cmd_map
1448 = linemap_check_ordinary (linemap_add (line_table
, LC_RENAME
, 0,
1449 _("<command-line>"), 0));
1450 cb_file_change (parse_in
, cmd_map
);
1452 /* All command line defines must have the same location. */
1453 cpp_force_token_locations (parse_in
, cmd_map
->start_location
);
1454 for (size_t i
= 0; i
< deferred_count
; i
++)
1456 struct deferred_opt
*opt
= &deferred_opts
[i
];
1458 if (opt
->code
== OPT_D
)
1459 cpp_define (parse_in
, opt
->arg
);
1460 else if (opt
->code
== OPT_U
)
1461 cpp_undef (parse_in
, opt
->arg
);
1462 else if (opt
->code
== OPT_A
)
1464 if (opt
->arg
[0] == '-')
1465 cpp_unassert (parse_in
, opt
->arg
+ 1);
1467 cpp_assert (parse_in
, opt
->arg
);
1471 cpp_stop_forcing_token_locations (parse_in
);
1473 else if (cpp_opts
->directives_only
)
1474 cpp_init_special_builtins (parse_in
);
1476 /* Start the main input file, if the debug writer wants it. */
1477 if (debug_hooks
->start_end_main_source_file
1478 && !flag_preprocess_only
)
1479 (*debug_hooks
->start_source_file
) (0, this_input_filename
);
1481 if (!cpp_opts
->preprocessed
)
1482 /* Handle -imacros after -D and -U. */
1483 for (size_t i
= 0; i
< deferred_count
; i
++)
1485 struct deferred_opt
*opt
= &deferred_opts
[i
];
1487 if (opt
->code
== OPT_imacros
1488 && cpp_push_include (parse_in
, opt
->arg
))
1490 /* Disable push_command_line_include callback for now. */
1491 include_cursor
= deferred_count
+ 1;
1492 cpp_scan_nooutput (parse_in
);
1497 push_command_line_include ();
1500 /* Give CPP the next file given by -include, if any. */
1502 push_command_line_include (void)
1504 /* This can happen if disabled by -imacros for example.
1505 Punt so that we don't set "<command-line>" as the filename for
1507 if (include_cursor
> deferred_count
)
1510 if (!done_preinclude
)
1512 done_preinclude
= true;
1513 if (flag_hosted
&& std_inc
&& !cpp_opts
->preprocessed
)
1515 const char *preinc
= targetcm
.c_preinclude ();
1516 if (preinc
&& cpp_push_default_include (parse_in
, preinc
))
1521 pch_cpp_save_state ();
1523 while (include_cursor
< deferred_count
)
1525 struct deferred_opt
*opt
= &deferred_opts
[include_cursor
++];
1527 if (!cpp_opts
->preprocessed
&& opt
->code
== OPT_include
1528 && cpp_push_include (parse_in
, opt
->arg
))
1532 if (include_cursor
== deferred_count
)
1535 /* -Wunused-macros should only warn about macros defined hereafter. */
1536 cpp_opts
->warn_unused_macros
= cpp_warn_unused_macros
;
1537 /* Restore the line map back to the main file. */
1538 if (!cpp_opts
->preprocessed
)
1539 cpp_change_file (parse_in
, LC_RENAME
, this_input_filename
);
1541 /* Set this here so the client can change the option if it wishes,
1542 and after stacking the main file so we don't trace the main file. */
1543 line_table
->trace_includes
= cpp_opts
->print_include_names
;
1547 /* File change callback. Has to handle -include files. */
1549 cb_file_change (cpp_reader
* ARG_UNUSED (pfile
),
1550 const line_map_ordinary
*new_map
)
1552 if (flag_preprocess_only
)
1553 pp_file_change (new_map
);
1555 fe_file_change (new_map
);
1558 && (new_map
->reason
== LC_ENTER
|| new_map
->reason
== LC_RENAME
))
1560 /* Signal to plugins that a file is included. This could happen
1561 several times with the same file path, e.g. because of
1562 several '#include' or '#line' directives... */
1563 invoke_plugin_callbacks
1564 (PLUGIN_INCLUDE_FILE
,
1565 const_cast<char*> (ORDINARY_MAP_FILE_NAME (new_map
)));
1568 if (new_map
== 0 || (new_map
->reason
== LC_LEAVE
&& MAIN_FILE_P (new_map
)))
1570 pch_cpp_save_state ();
1571 push_command_line_include ();
1576 cb_dir_change (cpp_reader
* ARG_UNUSED (pfile
), const char *dir
)
1578 if (!set_src_pwd (dir
))
1579 warning (0, "too late for # directive to set debug directory");
1582 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1583 extensions if ISO). There is no concept of gnu94. */
1585 set_std_c89 (int c94
, int iso
)
1587 cpp_set_lang (parse_in
, c94
? CLK_STDC94
: iso
? CLK_STDC89
: CLK_GNUC89
);
1590 flag_no_gnu_keywords
= iso
;
1591 flag_no_nonansi_builtin
= iso
;
1596 lang_hooks
.name
= "GNU C89";
1599 /* Set the C 99 standard (without GNU extensions if ISO). */
1601 set_std_c99 (int iso
)
1603 cpp_set_lang (parse_in
, iso
? CLK_STDC99
: CLK_GNUC99
);
1605 flag_no_nonansi_builtin
= iso
;
1611 lang_hooks
.name
= "GNU C99";
1614 /* Set the C 11 standard (without GNU extensions if ISO). */
1616 set_std_c11 (int iso
)
1618 cpp_set_lang (parse_in
, iso
? CLK_STDC11
: CLK_GNUC11
);
1620 flag_no_nonansi_builtin
= iso
;
1626 lang_hooks
.name
= "GNU C11";
1629 /* Set the C 17 standard (without GNU extensions if ISO). */
1631 set_std_c17 (int iso
)
1633 cpp_set_lang (parse_in
, iso
? CLK_STDC17
: CLK_GNUC17
);
1635 flag_no_nonansi_builtin
= iso
;
1641 lang_hooks
.name
= "GNU C17";
1644 /* Set the C 2X standard (without GNU extensions if ISO). */
1646 set_std_c2x (int iso
)
1648 cpp_set_lang (parse_in
, iso
? CLK_STDC2X
: CLK_GNUC2X
);
1650 flag_no_nonansi_builtin
= iso
;
1656 lang_hooks
.name
= "GNU C2X";
1660 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1662 set_std_cxx98 (int iso
)
1664 cpp_set_lang (parse_in
, iso
? CLK_CXX98
: CLK_GNUCXX
);
1665 flag_no_gnu_keywords
= iso
;
1666 flag_no_nonansi_builtin
= iso
;
1670 cxx_dialect
= cxx98
;
1671 lang_hooks
.name
= "GNU C++98";
1674 /* Set the C++ 2011 standard (without GNU extensions if ISO). */
1676 set_std_cxx11 (int iso
)
1678 cpp_set_lang (parse_in
, iso
? CLK_CXX11
: CLK_GNUCXX11
);
1679 flag_no_gnu_keywords
= iso
;
1680 flag_no_nonansi_builtin
= iso
;
1682 /* C++11 includes the C99 standard library. */
1685 cxx_dialect
= cxx11
;
1686 lang_hooks
.name
= "GNU C++11";
1689 /* Set the C++ 2014 standard (without GNU extensions if ISO). */
1691 set_std_cxx14 (int iso
)
1693 cpp_set_lang (parse_in
, iso
? CLK_CXX14
: CLK_GNUCXX14
);
1694 flag_no_gnu_keywords
= iso
;
1695 flag_no_nonansi_builtin
= iso
;
1697 /* C++14 includes the C99 standard library. */
1700 cxx_dialect
= cxx14
;
1701 lang_hooks
.name
= "GNU C++14";
1704 /* Set the C++ 2017 standard (without GNU extensions if ISO). */
1706 set_std_cxx17 (int iso
)
1708 cpp_set_lang (parse_in
, iso
? CLK_CXX17
: CLK_GNUCXX17
);
1709 flag_no_gnu_keywords
= iso
;
1710 flag_no_nonansi_builtin
= iso
;
1712 /* C++17 includes the C11 standard library. */
1716 cxx_dialect
= cxx17
;
1717 lang_hooks
.name
= "GNU C++17";
1720 /* Set the C++ 202a draft standard (without GNU extensions if ISO). */
1722 set_std_cxx2a (int iso
)
1724 cpp_set_lang (parse_in
, iso
? CLK_CXX2A
: CLK_GNUCXX2A
);
1725 flag_no_gnu_keywords
= iso
;
1726 flag_no_nonansi_builtin
= iso
;
1728 /* C++17 includes the C11 standard library. */
1732 /* C++2a includes concepts. */
1733 cxx_dialect
= cxx2a
;
1734 lang_hooks
.name
= "GNU C++17"; /* Pretend C++17 until standardization. */
1737 /* Args to -d specify what to dump. Silently ignore
1738 unrecognized options; they may be aimed at toplev.c. */
1740 handle_OPT_d (const char *arg
)
1744 while ((c
= *arg
++) != '\0')
1747 case 'M': /* Dump macros only. */
1748 case 'N': /* Dump names. */
1749 case 'D': /* Dump definitions. */
1750 case 'U': /* Dump used macros. */
1751 flag_dump_macros
= c
;
1755 flag_dump_includes
= 1;