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 && !global_options_set
.x_flag_fp_int_builtin_inexact
)
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. */
850 if (!global_options_set
.x_flag_tree_loop_distribute_patterns
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 /* -Wshift-overflow is enabled by default in C99 and C++11 modes. */
908 if (warn_shift_overflow
== -1)
909 warn_shift_overflow
= cxx_dialect
>= cxx11
|| flag_isoc99
;
911 /* -Wshift-negative-value is enabled by -Wextra in C99 and C++11 modes. */
912 if (warn_shift_negative_value
== -1)
913 warn_shift_negative_value
= (extra_warnings
914 && (cxx_dialect
>= cxx11
|| flag_isoc99
));
916 /* -Wregister is enabled by default in C++17. */
917 if (!global_options_set
.x_warn_register
)
918 warn_register
= cxx_dialect
>= cxx17
;
920 /* -Wcomma-subscript is enabled by default in C++20. */
921 if (!global_options_set
.x_warn_comma_subscript
)
922 warn_comma_subscript
= (cxx_dialect
>= cxx2a
&& warn_deprecated
);
924 /* -Wvolatile is enabled by default in C++20. */
925 if (!global_options_set
.x_warn_volatile
)
926 warn_volatile
= (cxx_dialect
>= cxx2a
&& warn_deprecated
);
928 /* Declone C++ 'structors if -Os. */
929 if (flag_declone_ctor_dtor
== -1)
930 flag_declone_ctor_dtor
= optimize_size
;
932 if (flag_abi_compat_version
== 1)
934 warning (0, "%<-fabi-compat-version=1%> is not supported, using =2");
935 flag_abi_compat_version
= 2;
938 /* Change flag_abi_version to be the actual current ABI level, for the
939 benefit of c_cpp_builtins, and to make comparison simpler. */
940 const int latest_abi_version
= 14;
941 /* Generate compatibility aliases for ABI v11 (7.1) by default. */
942 const int abi_compat_default
= 11;
944 #define clamp(X) if (X == 0 || X > latest_abi_version) X = latest_abi_version
945 clamp (flag_abi_version
);
946 clamp (warn_abi_version
);
947 clamp (flag_abi_compat_version
);
950 /* Default -Wabi= or -fabi-compat-version= from each other. */
951 if (warn_abi_version
== -1 && flag_abi_compat_version
!= -1)
952 warn_abi_version
= flag_abi_compat_version
;
953 else if (flag_abi_compat_version
== -1 && warn_abi_version
!= -1)
954 flag_abi_compat_version
= warn_abi_version
;
955 else if (warn_abi_version
== -1 && flag_abi_compat_version
== -1)
957 warn_abi_version
= latest_abi_version
;
958 if (flag_abi_version
== latest_abi_version
)
960 auto_diagnostic_group d
;
961 if (warning (OPT_Wabi
, "%<-Wabi%> won%'t warn about anything"))
963 inform (input_location
, "%<-Wabi%> warns about differences "
964 "from the most up-to-date ABI, which is also used "
966 inform (input_location
, "use e.g. %<-Wabi=11%> to warn about "
967 "changes from GCC 7");
969 flag_abi_compat_version
= abi_compat_default
;
972 flag_abi_compat_version
= latest_abi_version
;
975 /* By default, enable the new inheriting constructor semantics along with ABI
976 11. New and old should coexist fine, but it is a change in what
977 artificial symbols are generated. */
978 if (!global_options_set
.x_flag_new_inheriting_ctors
)
979 flag_new_inheriting_ctors
= abi_version_at_least (11);
981 /* For GCC 7, only enable DR150 resolution by default if -std=c++17. */
982 if (!global_options_set
.x_flag_new_ttp
)
983 flag_new_ttp
= (cxx_dialect
>= cxx17
);
985 if (cxx_dialect
>= cxx11
)
987 /* If we're allowing C++0x constructs, don't warn about C++98
988 identifiers which are keywords in C++0x. */
989 warn_cxx11_compat
= 0;
990 cpp_opts
->cpp_warn_cxx11_compat
= 0;
992 if (warn_narrowing
== -1)
995 /* Unless -f{,no-}ext-numeric-literals has been used explicitly,
996 for -std=c++{11,14,17,2a} default to -fno-ext-numeric-literals. */
997 if (flag_iso
&& !global_options_set
.x_flag_ext_numeric_literals
)
998 cpp_opts
->ext_numeric_literals
= 0;
1000 else if (warn_narrowing
== -1)
1003 /* C++17 has stricter evaluation order requirements; let's use some of them
1004 for earlier C++ as well, so chaining works as expected. */
1005 if (c_dialect_cxx ()
1006 && flag_strong_eval_order
== -1)
1007 flag_strong_eval_order
= (cxx_dialect
>= cxx17
? 2 : 1);
1009 /* Global sized deallocation is new in C++14. */
1010 if (flag_sized_deallocation
== -1)
1011 flag_sized_deallocation
= (cxx_dialect
>= cxx14
);
1013 /* char8_t support is new in C++2A. */
1014 if (flag_char8_t
== -1)
1015 flag_char8_t
= (cxx_dialect
>= cxx2a
);
1017 if (flag_extern_tls_init
)
1019 if (!TARGET_SUPPORTS_ALIASES
|| !SUPPORTS_WEAK
)
1021 /* Lazy TLS initialization for a variable in another TU requires
1022 alias and weak reference support. */
1023 if (flag_extern_tls_init
> 0)
1024 sorry ("external TLS initialization functions not supported "
1027 flag_extern_tls_init
= 0;
1030 flag_extern_tls_init
= 1;
1033 /* Enable by default only for C++ and C++ with ObjC extensions. */
1034 if (warn_return_type
== -1 && c_dialect_cxx ())
1035 warn_return_type
= 1;
1037 /* C++2a is the final version of concepts. We still use -fconcepts
1038 to know when concepts are enabled. Note that -fconcepts-ts can
1039 be used to include additional features, although modified to
1040 work with the standard. */
1041 if (cxx_dialect
>= cxx2a
)
1043 else if (flag_concepts
)
1044 /* For -std=c++17 -fconcepts, imply -fconcepts-ts. */
1045 flag_concepts_ts
= 1;
1047 if (num_in_fnames
> 1)
1048 error ("too many filenames given; type %<%s %s%> for usage",
1049 progname
, "--help");
1051 if (flag_preprocess_only
)
1053 /* Open the output now. We must do so even if flag_no_output is
1054 on, because there may be other output than from the actual
1055 preprocessing (e.g. from -dM). */
1056 if (out_fname
[0] == '\0')
1057 out_stream
= stdout
;
1059 out_stream
= fopen (out_fname
, "w");
1061 if (out_stream
== NULL
)
1063 fatal_error (input_location
, "opening output file %s: %m", out_fname
);
1067 init_pp_output (out_stream
);
1073 /* When writing a PCH file, avoid reading some other PCH file,
1074 because the default address space slot then can't be used
1075 for the output PCH file. */
1078 c_common_no_more_pch ();
1079 /* Only -g0 and -gdwarf* are supported with PCH, for other
1080 debug formats we warn here and refuse to load any PCH files. */
1081 if (write_symbols
!= NO_DEBUG
&& write_symbols
!= DWARF2_DEBUG
)
1082 warning (OPT_Wdeprecated
,
1083 "the %qs debug format cannot be used with "
1084 "pre-compiled headers", debug_type_names
[write_symbols
]);
1086 else if (write_symbols
!= NO_DEBUG
&& write_symbols
!= DWARF2_DEBUG
)
1087 c_common_no_more_pch ();
1089 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1090 input_location
= UNKNOWN_LOCATION
;
1093 cb
= cpp_get_callbacks (parse_in
);
1094 cb
->file_change
= cb_file_change
;
1095 cb
->dir_change
= cb_dir_change
;
1096 cpp_post_options (parse_in
);
1097 init_global_opts_from_cpp (&global_options
, cpp_get_options (parse_in
));
1099 input_location
= UNKNOWN_LOCATION
;
1101 *pfilename
= this_input_filename
1102 = cpp_read_main_file (parse_in
, in_fnames
[0]);
1103 /* Don't do any compilation or preprocessing if there is no input file. */
1104 if (this_input_filename
== NULL
)
1110 if (flag_working_directory
1111 && flag_preprocess_only
&& !flag_no_line_commands
)
1112 pp_dir_change (parse_in
, get_src_pwd ());
1114 /* Disable LTO output when outputting a precompiled header. */
1115 if (pch_file
&& flag_lto
)
1118 flag_generate_lto
= 0;
1121 return flag_preprocess_only
;
1124 /* Front end initialization common to C, ObjC and C++. */
1126 c_common_init (void)
1128 /* Set up preprocessor arithmetic. Must be done after call to
1129 c_common_nodes_and_builtins for type nodes to be good. */
1130 cpp_opts
->precision
= TYPE_PRECISION (intmax_type_node
);
1131 cpp_opts
->char_precision
= TYPE_PRECISION (char_type_node
);
1132 cpp_opts
->int_precision
= TYPE_PRECISION (integer_type_node
);
1133 cpp_opts
->wchar_precision
= TYPE_PRECISION (wchar_type_node
);
1134 cpp_opts
->unsigned_wchar
= TYPE_UNSIGNED (wchar_type_node
);
1135 cpp_opts
->bytes_big_endian
= BYTES_BIG_ENDIAN
;
1137 /* This can't happen until after wchar_precision and bytes_big_endian
1139 cpp_init_iconv (parse_in
);
1144 fputs ("Compiler executable checksum: ", stderr
);
1145 for (i
= 0; i
< 16; i
++)
1146 fprintf (stderr
, "%02x", executable_checksum
[i
]);
1147 putc ('\n', stderr
);
1150 /* Has to wait until now so that cpplib has its hash table. */
1153 if (flag_preprocess_only
)
1155 c_finish_options ();
1156 preprocess_file (parse_in
);
1163 /* Initialize the integrated preprocessor after debug output has been
1164 initialized; loop over each input file. */
1166 c_common_parse_file (void)
1173 c_finish_options ();
1174 /* Open the dump file to use for the original dump output
1175 here, to be used during parsing for the current file. */
1176 original_dump_file
= dump_begin (TDI_original
, &original_dump_flags
);
1181 /* And end the main input file, if the debug writer wants it */
1182 if (debug_hooks
->start_end_main_source_file
)
1183 (*debug_hooks
->end_source_file
) (0);
1184 if (++i
>= num_in_fnames
)
1186 cpp_undef_all (parse_in
);
1187 cpp_clear_file_cache (parse_in
);
1189 = cpp_read_main_file (parse_in
, in_fnames
[i
]);
1190 if (original_dump_file
)
1192 dump_end (TDI_original
, original_dump_file
);
1193 original_dump_file
= NULL
;
1195 /* If an input file is missing, abandon further compilation.
1196 cpplib has issued a diagnostic. */
1197 if (!this_input_filename
)
1201 c_parse_final_cleanups ();
1204 /* Returns the appropriate dump file for PHASE to dump with FLAGS. */
1207 get_dump_info (int phase
, dump_flags_t
*flags
)
1209 gcc_assert (phase
== TDI_original
);
1211 *flags
= original_dump_flags
;
1212 return original_dump_file
;
1215 /* Common finish hook for the C, ObjC and C++ front ends. */
1217 c_common_finish (void)
1219 FILE *deps_stream
= NULL
;
1221 /* Note that we write the dependencies even if there are errors. This is
1222 useful for handling outdated generated headers that now trigger errors
1223 (for example, with #error) which would be resolved by re-generating
1224 them. In a sense, this complements -MG. */
1225 if (cpp_opts
->deps
.style
!= DEPS_NONE
)
1227 /* If -M or -MM was seen without -MF, default output to the
1230 deps_stream
= out_stream
;
1231 else if (deps_file
[0] == '-' && deps_file
[1] == '\0')
1232 deps_stream
= stdout
;
1235 deps_stream
= fopen (deps_file
, deps_append
? "a": "w");
1237 fatal_error (input_location
, "opening dependency file %s: %m",
1242 /* For performance, avoid tearing down cpplib's internal structures
1243 with cpp_destroy (). */
1244 cpp_finish (parse_in
, deps_stream
);
1246 if (deps_stream
&& deps_stream
!= out_stream
&& deps_stream
!= stdout
1247 && (ferror (deps_stream
) || fclose (deps_stream
)))
1248 fatal_error (input_location
, "closing dependency file %s: %m", deps_file
);
1250 if (out_stream
&& (ferror (out_stream
) || fclose (out_stream
)))
1251 fatal_error (input_location
, "when writing output to %s: %m", out_fname
);
1254 /* Either of two environment variables can specify output of
1255 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1256 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1257 and DEPS_TARGET is the target to mention in the deps. They also
1258 result in dependency information being appended to the output file
1259 rather than overwriting it, and like Sun's compiler
1260 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1262 check_deps_environment_vars (void)
1266 spec
= getenv ("DEPENDENCIES_OUTPUT");
1268 cpp_opts
->deps
.style
= DEPS_USER
;
1271 spec
= getenv ("SUNPRO_DEPENDENCIES");
1274 cpp_opts
->deps
.style
= DEPS_SYSTEM
;
1275 cpp_opts
->deps
.ignore_main_file
= true;
1281 /* Find the space before the DEPS_TARGET, if there is one. */
1282 char *s
= strchr (spec
, ' ');
1285 /* Let the caller perform MAKE quoting. */
1286 defer_opt (OPT_MT
, s
+ 1);
1290 /* Command line -MF overrides environment variables and default. */
1299 /* Handle deferred command line switches. */
1301 handle_deferred_opts (void)
1303 /* Avoid allocating the deps buffer if we don't need it.
1304 (This flag may be true without there having been -MT or -MQ
1305 options, but we'll still need the deps buffer.) */
1309 mkdeps
*deps
= cpp_get_deps (parse_in
);
1311 for (size_t i
= 0; i
< deferred_count
; i
++)
1313 struct deferred_opt
*opt
= &deferred_opts
[i
];
1315 if (opt
->code
== OPT_MT
|| opt
->code
== OPT_MQ
)
1316 deps_add_target (deps
, opt
->arg
, opt
->code
== OPT_MQ
);
1320 /* These settings are appropriate for GCC, but not necessarily so for
1321 cpplib as a library. */
1323 sanitize_cpp_opts (void)
1325 /* If we don't know what style of dependencies to output, complain
1326 if any other dependency switches have been given. */
1327 if (deps_seen
&& cpp_opts
->deps
.style
== DEPS_NONE
)
1328 error ("to generate dependencies you must specify either %<-M%> "
1331 /* -dM and dependencies suppress normal output; do it here so that
1332 the last -d[MDN] switch overrides earlier ones. */
1333 if (flag_dump_macros
== 'M')
1336 /* By default, -fdirectives-only implies -dD. This allows subsequent phases
1337 to perform proper macro expansion. */
1338 if (cpp_opts
->directives_only
&& !cpp_opts
->preprocessed
&& !flag_dump_macros
)
1339 flag_dump_macros
= 'D';
1341 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1342 -dM since at least glibc relies on -M -dM to work. */
1343 /* Also, flag_no_output implies flag_no_line_commands, always. */
1346 if (flag_dump_macros
!= 'M')
1347 flag_dump_macros
= 0;
1348 flag_dump_includes
= 0;
1349 flag_no_line_commands
= 1;
1351 else if (cpp_opts
->deps
.missing_files
)
1352 error ("%<-MG%> may only be used with %<-M%> or %<-MM%>");
1354 cpp_opts
->unsigned_char
= !flag_signed_char
;
1355 cpp_opts
->stdc_0_in_system_headers
= STDC_0_IN_SYSTEM_HEADERS
;
1357 /* Wlong-long is disabled by default. It is enabled by:
1358 [-Wpedantic | -Wtraditional] -std=[gnu|c]++98 ; or
1359 [-Wpedantic | -Wtraditional] -std=non-c99
1361 Either -Wlong-long or -Wno-long-long override any other settings.
1362 ??? These conditions should be handled in c.opt. */
1363 if (warn_long_long
== -1)
1365 warn_long_long
= ((pedantic
|| warn_traditional
)
1366 && (c_dialect_cxx () ? cxx_dialect
== cxx98
: !flag_isoc99
));
1367 cpp_opts
->cpp_warn_long_long
= warn_long_long
;
1370 /* If we're generating preprocessor output, emit current directory
1371 if explicitly requested or if debugging information is enabled.
1372 ??? Maybe we should only do it for debugging formats that
1373 actually output the current directory? */
1374 if (flag_working_directory
== -1)
1375 flag_working_directory
= (debug_info_level
!= DINFO_LEVEL_NONE
);
1377 if (warn_implicit_fallthrough
< 5)
1378 cpp_opts
->cpp_warn_implicit_fallthrough
= warn_implicit_fallthrough
;
1380 cpp_opts
->cpp_warn_implicit_fallthrough
= 0;
1382 if (cpp_opts
->directives_only
)
1384 if (cpp_warn_unused_macros
)
1385 error ("%<-fdirectives-only%> is incompatible "
1386 "with %<-Wunused-macros%>");
1387 if (cpp_opts
->traditional
)
1388 error ("%<-fdirectives-only%> is incompatible with %<-traditional%>");
1392 /* Add include path with a prefix at the front of its name. */
1394 add_prefixed_path (const char *suffix
, incpath_kind chain
)
1398 size_t prefix_len
, suffix_len
;
1400 suffix_len
= strlen (suffix
);
1401 prefix
= iprefix
? iprefix
: cpp_GCC_INCLUDE_DIR
;
1402 prefix_len
= iprefix
? strlen (iprefix
) : cpp_GCC_INCLUDE_DIR_len
;
1404 path
= (char *) xmalloc (prefix_len
+ suffix_len
+ 1);
1405 memcpy (path
, prefix
, prefix_len
);
1406 memcpy (path
+ prefix_len
, suffix
, suffix_len
);
1407 path
[prefix_len
+ suffix_len
] = '\0';
1409 add_path (path
, chain
, 0, false);
1412 /* Handle -D, -U, -A, -imacros, and the first -include. */
1414 c_finish_options (void)
1416 if (!cpp_opts
->preprocessed
)
1418 const line_map_ordinary
*bltin_map
1419 = linemap_check_ordinary (linemap_add (line_table
, LC_RENAME
, 0,
1420 _("<built-in>"), 0));
1421 cb_file_change (parse_in
, bltin_map
);
1423 /* Make sure all of the builtins about to be declared have
1424 BUILTINS_LOCATION has their location_t. */
1425 cpp_force_token_locations (parse_in
, BUILTINS_LOCATION
);
1427 cpp_init_builtins (parse_in
, flag_hosted
);
1428 c_cpp_builtins (parse_in
);
1430 /* We're about to send user input to cpplib, so make it warn for
1431 things that we previously (when we sent it internal definitions)
1432 told it to not warn.
1434 C99 permits implementation-defined characters in identifiers.
1435 The documented meaning of -std= is to turn off extensions that
1436 conflict with the specified standard, and since a strictly
1437 conforming program cannot contain a '$', we do not condition
1438 their acceptance on the -std= setting. */
1439 cpp_opts
->warn_dollars
= (cpp_opts
->cpp_pedantic
&& !cpp_opts
->c99
);
1441 const line_map_ordinary
*cmd_map
1442 = linemap_check_ordinary (linemap_add (line_table
, LC_RENAME
, 0,
1443 _("<command-line>"), 0));
1444 cb_file_change (parse_in
, cmd_map
);
1446 /* All command line defines must have the same location. */
1447 cpp_force_token_locations (parse_in
, cmd_map
->start_location
);
1448 for (size_t i
= 0; i
< deferred_count
; i
++)
1450 struct deferred_opt
*opt
= &deferred_opts
[i
];
1452 if (opt
->code
== OPT_D
)
1453 cpp_define (parse_in
, opt
->arg
);
1454 else if (opt
->code
== OPT_U
)
1455 cpp_undef (parse_in
, opt
->arg
);
1456 else if (opt
->code
== OPT_A
)
1458 if (opt
->arg
[0] == '-')
1459 cpp_unassert (parse_in
, opt
->arg
+ 1);
1461 cpp_assert (parse_in
, opt
->arg
);
1465 cpp_stop_forcing_token_locations (parse_in
);
1467 else if (cpp_opts
->directives_only
)
1468 cpp_init_special_builtins (parse_in
);
1470 /* Start the main input file, if the debug writer wants it. */
1471 if (debug_hooks
->start_end_main_source_file
1472 && !flag_preprocess_only
)
1473 (*debug_hooks
->start_source_file
) (0, this_input_filename
);
1475 if (!cpp_opts
->preprocessed
)
1476 /* Handle -imacros after -D and -U. */
1477 for (size_t i
= 0; i
< deferred_count
; i
++)
1479 struct deferred_opt
*opt
= &deferred_opts
[i
];
1481 if (opt
->code
== OPT_imacros
1482 && cpp_push_include (parse_in
, opt
->arg
))
1484 /* Disable push_command_line_include callback for now. */
1485 include_cursor
= deferred_count
+ 1;
1486 cpp_scan_nooutput (parse_in
);
1491 push_command_line_include ();
1494 /* Give CPP the next file given by -include, if any. */
1496 push_command_line_include (void)
1498 /* This can happen if disabled by -imacros for example.
1499 Punt so that we don't set "<command-line>" as the filename for
1501 if (include_cursor
> deferred_count
)
1504 if (!done_preinclude
)
1506 done_preinclude
= true;
1507 if (flag_hosted
&& std_inc
&& !cpp_opts
->preprocessed
)
1509 const char *preinc
= targetcm
.c_preinclude ();
1510 if (preinc
&& cpp_push_default_include (parse_in
, preinc
))
1515 pch_cpp_save_state ();
1517 while (include_cursor
< deferred_count
)
1519 struct deferred_opt
*opt
= &deferred_opts
[include_cursor
++];
1521 if (!cpp_opts
->preprocessed
&& opt
->code
== OPT_include
1522 && cpp_push_include (parse_in
, opt
->arg
))
1526 if (include_cursor
== deferred_count
)
1529 /* -Wunused-macros should only warn about macros defined hereafter. */
1530 cpp_opts
->warn_unused_macros
= cpp_warn_unused_macros
;
1531 /* Restore the line map back to the main file. */
1532 if (!cpp_opts
->preprocessed
)
1533 cpp_change_file (parse_in
, LC_RENAME
, this_input_filename
);
1535 /* Set this here so the client can change the option if it wishes,
1536 and after stacking the main file so we don't trace the main file. */
1537 line_table
->trace_includes
= cpp_opts
->print_include_names
;
1541 /* File change callback. Has to handle -include files. */
1543 cb_file_change (cpp_reader
* ARG_UNUSED (pfile
),
1544 const line_map_ordinary
*new_map
)
1546 if (flag_preprocess_only
)
1547 pp_file_change (new_map
);
1549 fe_file_change (new_map
);
1552 && (new_map
->reason
== LC_ENTER
|| new_map
->reason
== LC_RENAME
))
1554 /* Signal to plugins that a file is included. This could happen
1555 several times with the same file path, e.g. because of
1556 several '#include' or '#line' directives... */
1557 invoke_plugin_callbacks
1558 (PLUGIN_INCLUDE_FILE
,
1559 const_cast<char*> (ORDINARY_MAP_FILE_NAME (new_map
)));
1562 if (new_map
== 0 || (new_map
->reason
== LC_LEAVE
&& MAIN_FILE_P (new_map
)))
1564 pch_cpp_save_state ();
1565 push_command_line_include ();
1570 cb_dir_change (cpp_reader
* ARG_UNUSED (pfile
), const char *dir
)
1572 if (!set_src_pwd (dir
))
1573 warning (0, "too late for # directive to set debug directory");
1576 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1577 extensions if ISO). There is no concept of gnu94. */
1579 set_std_c89 (int c94
, int iso
)
1581 cpp_set_lang (parse_in
, c94
? CLK_STDC94
: iso
? CLK_STDC89
: CLK_GNUC89
);
1584 flag_no_gnu_keywords
= iso
;
1585 flag_no_nonansi_builtin
= iso
;
1590 lang_hooks
.name
= "GNU C89";
1593 /* Set the C 99 standard (without GNU extensions if ISO). */
1595 set_std_c99 (int iso
)
1597 cpp_set_lang (parse_in
, iso
? CLK_STDC99
: CLK_GNUC99
);
1599 flag_no_nonansi_builtin
= iso
;
1605 lang_hooks
.name
= "GNU C99";
1608 /* Set the C 11 standard (without GNU extensions if ISO). */
1610 set_std_c11 (int iso
)
1612 cpp_set_lang (parse_in
, iso
? CLK_STDC11
: CLK_GNUC11
);
1614 flag_no_nonansi_builtin
= iso
;
1620 lang_hooks
.name
= "GNU C11";
1623 /* Set the C 17 standard (without GNU extensions if ISO). */
1625 set_std_c17 (int iso
)
1627 cpp_set_lang (parse_in
, iso
? CLK_STDC17
: CLK_GNUC17
);
1629 flag_no_nonansi_builtin
= iso
;
1635 lang_hooks
.name
= "GNU C17";
1638 /* Set the C 2X standard (without GNU extensions if ISO). */
1640 set_std_c2x (int iso
)
1642 cpp_set_lang (parse_in
, iso
? CLK_STDC2X
: CLK_GNUC2X
);
1644 flag_no_nonansi_builtin
= iso
;
1650 lang_hooks
.name
= "GNU C2X";
1654 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1656 set_std_cxx98 (int iso
)
1658 cpp_set_lang (parse_in
, iso
? CLK_CXX98
: CLK_GNUCXX
);
1659 flag_no_gnu_keywords
= iso
;
1660 flag_no_nonansi_builtin
= iso
;
1664 cxx_dialect
= cxx98
;
1665 lang_hooks
.name
= "GNU C++98";
1668 /* Set the C++ 2011 standard (without GNU extensions if ISO). */
1670 set_std_cxx11 (int iso
)
1672 cpp_set_lang (parse_in
, iso
? CLK_CXX11
: CLK_GNUCXX11
);
1673 flag_no_gnu_keywords
= iso
;
1674 flag_no_nonansi_builtin
= iso
;
1676 /* C++11 includes the C99 standard library. */
1679 cxx_dialect
= cxx11
;
1680 lang_hooks
.name
= "GNU C++11";
1683 /* Set the C++ 2014 standard (without GNU extensions if ISO). */
1685 set_std_cxx14 (int iso
)
1687 cpp_set_lang (parse_in
, iso
? CLK_CXX14
: CLK_GNUCXX14
);
1688 flag_no_gnu_keywords
= iso
;
1689 flag_no_nonansi_builtin
= iso
;
1691 /* C++14 includes the C99 standard library. */
1694 cxx_dialect
= cxx14
;
1695 lang_hooks
.name
= "GNU C++14";
1698 /* Set the C++ 2017 standard (without GNU extensions if ISO). */
1700 set_std_cxx17 (int iso
)
1702 cpp_set_lang (parse_in
, iso
? CLK_CXX17
: CLK_GNUCXX17
);
1703 flag_no_gnu_keywords
= iso
;
1704 flag_no_nonansi_builtin
= iso
;
1706 /* C++17 includes the C11 standard library. */
1710 cxx_dialect
= cxx17
;
1711 lang_hooks
.name
= "GNU C++17";
1714 /* Set the C++ 202a draft standard (without GNU extensions if ISO). */
1716 set_std_cxx2a (int iso
)
1718 cpp_set_lang (parse_in
, iso
? CLK_CXX2A
: CLK_GNUCXX2A
);
1719 flag_no_gnu_keywords
= iso
;
1720 flag_no_nonansi_builtin
= iso
;
1722 /* C++17 includes the C11 standard library. */
1726 /* C++2a includes concepts. */
1727 cxx_dialect
= cxx2a
;
1728 lang_hooks
.name
= "GNU C++17"; /* Pretend C++17 until standardization. */
1731 /* Args to -d specify what to dump. Silently ignore
1732 unrecognized options; they may be aimed at toplev.c. */
1734 handle_OPT_d (const char *arg
)
1738 while ((c
= *arg
++) != '\0')
1741 case 'M': /* Dump macros only. */
1742 case 'N': /* Dump names. */
1743 case 'D': /* Dump definitions. */
1744 case 'U': /* Dump used macros. */
1745 flag_dump_macros
= c
;
1749 flag_dump_includes
= 1;