1 /* C/ObjC/C++ command line option handling.
2 Copyright (C) 2002-2017 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. */
44 #ifndef DOLLARS_IN_IDENTIFIERS
45 # define DOLLARS_IN_IDENTIFIERS true
48 #ifndef TARGET_SYSTEM_ROOT
49 # define TARGET_SYSTEM_ROOT NULL
53 #define TARGET_OPTF(ARG)
57 cpp_options
*cpp_opts
;
60 static const char *this_input_filename
;
62 /* Filename and stream for preprocessed output. */
63 static const char *out_fname
;
64 static FILE *out_stream
;
66 /* Append dependencies to deps_file. */
67 static bool deps_append
;
69 /* If dependency switches (-MF etc.) have been given. */
70 static bool deps_seen
;
75 /* Dependency output file. */
76 static const char *deps_file
;
78 /* The prefix given by -iprefix, if any. */
79 static const char *iprefix
;
81 /* The multilib directory given by -imultilib, if any. */
82 static const char *imultilib
;
84 /* The system root, if any. Overridden by -isysroot. */
85 static const char *sysroot
= TARGET_SYSTEM_ROOT
;
87 /* Zero disables all standard directories for headers. */
88 static bool std_inc
= true;
90 /* Zero disables the C++-specific standard directories for headers. */
91 static bool std_cxx_inc
= true;
93 /* If the quote chain has been split by -I-. */
94 static bool quote_chain_split
;
96 /* Number of deferred options. */
97 static size_t deferred_count
;
99 /* Number of deferred options scanned for -include. */
100 static size_t include_cursor
;
102 /* Dump files/flags to use during parsing. */
103 static FILE *original_dump_file
= NULL
;
104 static dump_flags_t original_dump_flags
;
106 /* Whether any standard preincluded header has been preincluded. */
107 static bool done_preinclude
;
109 static void handle_OPT_d (const char *);
110 static void set_std_cxx98 (int);
111 static void set_std_cxx11 (int);
112 static void set_std_cxx14 (int);
113 static void set_std_cxx17 (int);
114 static void set_std_cxx2a (int);
115 static void set_std_c89 (int, int);
116 static void set_std_c99 (int);
117 static void set_std_c11 (int);
118 static void check_deps_environment_vars (void);
119 static void handle_deferred_opts (void);
120 static void sanitize_cpp_opts (void);
121 static void add_prefixed_path (const char *, size_t);
122 static void push_command_line_include (void);
123 static void cb_file_change (cpp_reader
*, const line_map_ordinary
*);
124 static void cb_dir_change (cpp_reader
*, const char *);
125 static void c_finish_options (void);
127 #ifndef STDC_0_IN_SYSTEM_HEADERS
128 #define STDC_0_IN_SYSTEM_HEADERS 0
131 /* Holds switches parsed by c_common_handle_option (), but whose
132 handling is deferred to c_common_post_options (). */
133 static void defer_opt (enum opt_code
, const char *);
134 static struct deferred_opt
141 extern const unsigned int
142 c_family_lang_mask
= (CL_C
| CL_CXX
| CL_ObjC
| CL_ObjCXX
);
144 /* Defer option CODE with argument ARG. */
146 defer_opt (enum opt_code code
, const char *arg
)
148 deferred_opts
[deferred_count
].code
= code
;
149 deferred_opts
[deferred_count
].arg
= arg
;
153 /* Return language mask for option parsing. */
155 c_common_option_lang_mask (void)
157 static const unsigned int lang_flags
[] = {CL_C
, CL_ObjC
, CL_CXX
, CL_ObjCXX
};
159 return lang_flags
[c_language
];
162 /* Diagnostic finalizer for C/C++/Objective-C/Objective-C++. */
164 c_diagnostic_finalizer (diagnostic_context
*context
,
165 diagnostic_info
*diagnostic
)
167 diagnostic_show_locus (context
, diagnostic
->richloc
, diagnostic
->kind
);
168 /* By default print macro expansion contexts in the diagnostic
169 finalizer -- for tokens resulting from macro expansion. */
170 virt_loc_aware_diagnostic_finalizer (context
, diagnostic
);
171 pp_destroy_prefix (context
->printer
);
172 pp_flush (context
->printer
);
175 /* Common default settings for diagnostics. */
177 c_common_diagnostics_set_defaults (diagnostic_context
*context
)
179 diagnostic_finalizer (context
) = c_diagnostic_finalizer
;
180 context
->opt_permissive
= OPT_fpermissive
;
183 /* Whether options from all C-family languages should be accepted
185 static bool accept_all_c_family_options
= false;
187 /* Return whether to complain about a wrong-language option. */
189 c_common_complain_wrong_lang_p (const struct cl_option
*option
)
191 if (accept_all_c_family_options
192 && (option
->flags
& c_family_lang_mask
))
198 /* Initialize options structure OPTS. */
200 c_common_init_options_struct (struct gcc_options
*opts
)
202 opts
->x_flag_exceptions
= c_dialect_cxx ();
203 opts
->x_warn_pointer_arith
= c_dialect_cxx ();
204 opts
->x_warn_write_strings
= c_dialect_cxx ();
205 opts
->x_flag_warn_unused_result
= true;
207 /* By default, C99-like requirements for complex multiply and divide. */
208 opts
->x_flag_complex_method
= 2;
211 /* Common initialization before calling option handlers. */
213 c_common_init_options (unsigned int decoded_options_count
,
214 struct cl_decoded_option
*decoded_options
)
217 struct cpp_callbacks
*cb
;
220 = new (ggc_alloc
<string_concat_db
> ()) string_concat_db ();
222 parse_in
= cpp_create_reader (c_dialect_cxx () ? CLK_GNUCXX
: CLK_GNUC89
,
223 ident_hash
, line_table
);
224 cb
= cpp_get_callbacks (parse_in
);
225 cb
->error
= c_cpp_error
;
227 cpp_opts
= cpp_get_options (parse_in
);
228 cpp_opts
->dollars_in_ident
= DOLLARS_IN_IDENTIFIERS
;
229 cpp_opts
->objc
= c_dialect_objc ();
231 /* Reset to avoid warnings on internal definitions. We set it just
232 before passing on command-line options to cpplib. */
233 cpp_opts
->warn_dollars
= 0;
235 deferred_opts
= XNEWVEC (struct deferred_opt
, decoded_options_count
);
237 if (c_language
== clk_c
)
239 /* The default for C is gnu11. */
240 set_std_c11 (false /* ISO */);
242 /* If preprocessing assembly language, accept any of the C-family
243 front end options since the driver may pass them through. */
244 for (i
= 1; i
< decoded_options_count
; i
++)
245 if (decoded_options
[i
].opt_index
== OPT_lang_asm
)
247 accept_all_c_family_options
= true;
252 /* Set C++ standard to C++14 if not specified on the command line. */
253 if (c_dialect_cxx ())
254 set_std_cxx14 (/*ISO*/false);
256 global_dc
->colorize_source_p
= true;
259 /* Handle switch SCODE with argument ARG. VALUE is true, unless no-
260 form of an -f or -W option was given. Returns false if the switch was
261 invalid, true if valid. Use HANDLERS in recursive handle_option calls. */
263 c_common_handle_option (size_t scode
, const char *arg
, int value
,
264 int kind
, location_t loc
,
265 const struct cl_option_handlers
*handlers
)
267 const struct cl_option
*option
= &cl_options
[scode
];
268 enum opt_code code
= (enum opt_code
) scode
;
271 /* Prevent resetting the language standard to a C dialect when the driver
272 has already determined that we're looking at assembler input. */
273 bool preprocessing_asm_p
= (cpp_get_options (parse_in
)->lang
== CLK_ASM
);
278 if (cl_options
[code
].flags
& c_family_lang_mask
)
280 if ((option
->flags
& CL_TARGET
)
281 && ! targetcm
.handle_c_option (scode
, arg
, value
))
288 case OPT__output_pch_
:
293 defer_opt (code
, arg
);
297 cpp_opts
->discard_comments
= 0;
301 cpp_opts
->discard_comments
= 0;
302 cpp_opts
->discard_comments_in_macro_exp
= 0;
306 defer_opt (code
, arg
);
310 cpp_opts
->print_include_names
= 1;
314 TARGET_OPTF (xstrdup (arg
));
318 if (strcmp (arg
, "-"))
319 add_path (xstrdup (arg
), BRACKET
, 0, true);
322 if (quote_chain_split
)
323 error ("-I- specified twice");
324 quote_chain_split
= true;
325 split_quote_chain ();
326 inform (input_location
, "obsolete option -I- used, please use -iquote instead");
332 /* When doing dependencies with -M or -MM, suppress normal
333 preprocessed output, but still do -dM etc. as software
334 depends on this. Preprocessed output does occur if -MD, -MMD
335 or environment var dependency generation is used. */
336 cpp_opts
->deps
.style
= (code
== OPT_M
? DEPS_SYSTEM
: DEPS_USER
);
342 cpp_opts
->deps
.style
= (code
== OPT_MD
? DEPS_SYSTEM
: DEPS_USER
);
343 cpp_opts
->deps
.need_preprocessor_output
= true;
354 cpp_opts
->deps
.missing_files
= true;
359 cpp_opts
->deps
.phony_targets
= true;
365 defer_opt (code
, arg
);
369 flag_no_line_commands
= 1;
373 defer_opt (code
, arg
);
377 /* ??? Don't add new options here. Use LangEnabledBy in c.opt. */
379 cpp_opts
->warn_num_sign_change
= value
;
382 case OPT_Walloca_larger_than_
:
384 inform (loc
, "-Walloca-larger-than=0 is meaningless");
387 case OPT_Wvla_larger_than_
:
389 inform (loc
, "-Wvla-larger-than=0 is meaningless");
392 case OPT_Wunknown_pragmas
:
393 /* Set to greater than 1, so that even unknown pragmas in
394 system headers will be warned about. */
395 /* ??? There is no way to handle this automatically for now. */
396 warn_unknown_pragmas
= value
* 2;
400 if (!c_dialect_cxx ())
401 set_std_c89 (false, true);
403 set_std_cxx98 (true);
414 warning (0, "%<-Wabi=1%> is not supported, using =2");
417 warn_abi_version
= value
;
418 if (flag_abi_compat_version
== -1)
419 flag_abi_compat_version
= value
;
422 case OPT_fcanonical_system_headers
:
423 cpp_opts
->canonical_system_headers
= value
;
426 case OPT_fcond_mismatch
:
427 if (!c_dialect_cxx ())
429 flag_cond_mismatch
= value
;
432 warning (0, "switch %qs is no longer supported", option
->opt_text
);
439 disable_builtin_function (arg
);
442 case OPT_fdirectives_only
:
443 cpp_opts
->directives_only
= value
;
446 case OPT_fdollars_in_identifiers
:
447 cpp_opts
->dollars_in_ident
= value
;
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_foperator_names
:
467 cpp_opts
->operator_names
= value
;
471 cpp_opts
->restore_pch_deps
= value
;
474 case OPT_fpch_preprocess
:
475 flag_pch_preprocess
= value
;
478 case OPT_fpermissive
:
479 flag_permissive
= value
;
480 global_dc
->permissive
= value
;
483 case OPT_fpreprocessed
:
484 cpp_opts
->preprocessed
= value
;
491 case OPT_ftrack_macro_expansion
:
496 case OPT_ftrack_macro_expansion_
:
497 if (arg
&& *arg
!= '\0')
498 cpp_opts
->track_macro_expansion
= value
;
500 cpp_opts
->track_macro_expansion
= 2;
504 flag_use_repository
= value
;
506 flag_implicit_templates
= 0;
510 /* It is documented that we silently ignore silly values. */
511 if (value
>= 1 && value
<= 100)
512 cpp_opts
->tabstop
= value
;
515 case OPT_fexec_charset_
:
516 cpp_opts
->narrow_charset
= arg
;
519 case OPT_fwide_exec_charset_
:
520 cpp_opts
->wide_charset
= arg
;
523 case OPT_finput_charset_
:
524 cpp_opts
->input_charset
= arg
;
527 case OPT_ftemplate_depth_
:
528 max_tinst_depth
= value
;
531 case OPT_fvisibility_inlines_hidden
:
532 visibility_options
.inlines_hidden
= value
;
535 case OPT_femit_struct_debug_baseonly
:
536 set_struct_debug_option (&global_options
, loc
, "base");
539 case OPT_femit_struct_debug_reduced
:
540 set_struct_debug_option (&global_options
, loc
,
541 "dir:ord:sys,dir:gen:any,ind:base");
544 case OPT_femit_struct_debug_detailed_
:
545 set_struct_debug_option (&global_options
, loc
, arg
);
548 case OPT_fext_numeric_literals
:
549 cpp_opts
->ext_numeric_literals
= value
;
553 add_path (xstrdup (arg
), AFTER
, 0, true);
558 defer_opt (code
, arg
);
570 add_path (xstrdup (arg
), QUOTE
, 0, true);
578 add_path (xstrdup (arg
), SYSTEM
, 0, true);
581 case OPT_iwithprefix
:
582 add_prefixed_path (arg
, SYSTEM
);
585 case OPT_iwithprefixbefore
:
586 add_prefixed_path (arg
, BRACKET
);
590 cpp_set_lang (parse_in
, CLK_ASM
);
591 cpp_opts
->dollars_in_ident
= false;
606 error ("output filename specified twice");
609 case OPT_print_objc_runtime_info
:
610 print_struct_values
= 1;
618 case OPT_std_gnu__98
:
619 if (!preprocessing_asm_p
)
620 set_std_cxx98 (code
== OPT_std_c__98
/* ISO */);
624 case OPT_std_gnu__11
:
625 if (!preprocessing_asm_p
)
626 set_std_cxx11 (code
== OPT_std_c__11
/* ISO */);
630 case OPT_std_gnu__14
:
631 if (!preprocessing_asm_p
)
632 set_std_cxx14 (code
== OPT_std_c__14
/* ISO */);
636 case OPT_std_gnu__17
:
637 if (!preprocessing_asm_p
)
638 set_std_cxx17 (code
== OPT_std_c__17
/* ISO */);
642 case OPT_std_gnu__2a
:
643 if (!preprocessing_asm_p
)
644 set_std_cxx2a (code
== OPT_std_c__2a
/* ISO */);
648 case OPT_std_iso9899_199409
:
649 if (!preprocessing_asm_p
)
650 set_std_c89 (code
== OPT_std_iso9899_199409
/* c94 */, true /* ISO */);
654 if (!preprocessing_asm_p
)
655 set_std_c89 (false /* c94 */, false /* ISO */);
659 if (!preprocessing_asm_p
)
660 set_std_c99 (true /* ISO */);
664 if (!preprocessing_asm_p
)
665 set_std_c99 (false /* ISO */);
669 if (!preprocessing_asm_p
)
670 set_std_c11 (true /* ISO */);
674 if (!preprocessing_asm_p
)
675 set_std_c11 (false /* ISO */);
679 cpp_opts
->trigraphs
= 1;
682 case OPT_traditional_cpp
:
683 cpp_opts
->traditional
= 1;
694 C_handle_option_auto (&global_options
, &global_options_set
,
696 c_family_lang_mask
, kind
,
697 loc
, handlers
, global_dc
);
701 ObjC_handle_option_auto (&global_options
, &global_options_set
,
703 c_family_lang_mask
, kind
,
704 loc
, handlers
, global_dc
);
708 CXX_handle_option_auto (&global_options
, &global_options_set
,
710 c_family_lang_mask
, kind
,
711 loc
, handlers
, global_dc
);
715 ObjCXX_handle_option_auto (&global_options
, &global_options_set
,
717 c_family_lang_mask
, kind
,
718 loc
, handlers
, global_dc
);
725 cpp_handle_option_auto (&global_options
, scode
, cpp_opts
);
729 /* Default implementation of TARGET_HANDLE_C_OPTION. */
732 default_handle_c_option (size_t code ATTRIBUTE_UNUSED
,
733 const char *arg ATTRIBUTE_UNUSED
,
734 int value ATTRIBUTE_UNUSED
)
739 /* Post-switch processing. */
741 c_common_post_options (const char **pfilename
)
743 struct cpp_callbacks
*cb
;
745 /* Canonicalize the input and output filenames. */
746 if (in_fnames
== NULL
)
748 in_fnames
= XNEWVEC (const char *, 1);
751 else if (strcmp (in_fnames
[0], "-") == 0)
754 error ("cannot use %<-%> as input filename for a precompiled header");
759 if (out_fname
== NULL
|| !strcmp (out_fname
, "-"))
762 if (cpp_opts
->deps
.style
== DEPS_NONE
)
763 check_deps_environment_vars ();
765 handle_deferred_opts ();
767 sanitize_cpp_opts ();
769 register_include_chains (parse_in
, sysroot
, iprefix
, imultilib
,
770 std_inc
, std_cxx_inc
&& c_dialect_cxx (), verbose
);
772 #ifdef C_COMMON_OVERRIDE_OPTIONS
773 /* Some machines may reject certain combinations of C
774 language-specific options. */
775 C_COMMON_OVERRIDE_OPTIONS
;
778 /* Excess precision other than "fast" requires front-end
780 if (c_dialect_cxx ())
782 if (flag_excess_precision_cmdline
== EXCESS_PRECISION_STANDARD
)
783 sorry ("-fexcess-precision=standard for C++");
784 flag_excess_precision_cmdline
= EXCESS_PRECISION_FAST
;
786 else if (flag_excess_precision_cmdline
== EXCESS_PRECISION_DEFAULT
)
787 flag_excess_precision_cmdline
= (flag_iso
788 ? EXCESS_PRECISION_STANDARD
789 : EXCESS_PRECISION_FAST
);
791 /* ISO C restricts floating-point expression contraction to within
792 source-language expressions (-ffp-contract=on, currently an alias
793 for -ffp-contract=off). */
796 && (global_options_set
.x_flag_fp_contract_mode
797 == (enum fp_contract_mode
) 0)
798 && flag_unsafe_math_optimizations
== 0)
799 flag_fp_contract_mode
= FP_CONTRACT_OFF
;
801 /* If we are compiling C, and we are outside of a standards mode,
802 we can permit the new values from ISO/IEC TS 18661-3 for
803 FLT_EVAL_METHOD. Otherwise, we must restrict the possible values to
804 the set specified in ISO C99/C11. */
807 && (global_options_set
.x_flag_permitted_flt_eval_methods
808 == PERMITTED_FLT_EVAL_METHODS_DEFAULT
))
809 flag_permitted_flt_eval_methods
= PERMITTED_FLT_EVAL_METHODS_TS_18661
;
811 flag_permitted_flt_eval_methods
= PERMITTED_FLT_EVAL_METHODS_C11
;
813 /* By default we use C99 inline semantics in GNU99 or C99 mode. C99
814 inline semantics are not supported in GNU89 or C89 mode. */
815 if (flag_gnu89_inline
== -1)
816 flag_gnu89_inline
= !flag_isoc99
;
817 else if (!flag_gnu89_inline
&& !flag_isoc99
)
818 error ("-fno-gnu89-inline is only supported in GNU99 or C99 mode");
820 /* Default to ObjC sjlj exception handling if NeXT runtime. */
821 if (flag_objc_sjlj_exceptions
< 0)
822 flag_objc_sjlj_exceptions
= flag_next_runtime
;
823 if (flag_objc_exceptions
&& !flag_objc_sjlj_exceptions
)
826 /* If -ffreestanding, -fno-hosted or -fno-builtin then disable
827 pattern recognition. */
828 if (!global_options_set
.x_flag_tree_loop_distribute_patterns
830 flag_tree_loop_distribute_patterns
= 0;
832 /* -Woverlength-strings is off by default, but is enabled by -Wpedantic.
833 It is never enabled in C++, as the minimum limit is not normative
835 if (c_dialect_cxx ())
836 warn_overlength_strings
= 0;
838 /* Wmain is enabled by default in C++ but not in C. */
839 /* Wmain is disabled by default for -ffreestanding (!flag_hosted),
840 even if -Wall or -Wpedantic was given (warn_main will be 2 if set
841 by -Wall, 1 if set by -Wmain). */
843 warn_main
= (c_dialect_cxx () && flag_hosted
) ? 1 : 0;
844 else if (warn_main
== 2)
845 warn_main
= flag_hosted
? 1 : 0;
847 /* In C, -Wall and -Wc++-compat enable -Wenum-compare; if it has not
848 yet been set, it is disabled by default. In C++, it is enabled
850 if (warn_enum_compare
== -1)
851 warn_enum_compare
= c_dialect_cxx () ? 1 : 0;
853 /* -Wpacked-bitfield-compat is on by default for the C languages. The
854 warning is issued in stor-layout.c which is not part of the front-end so
855 we need to selectively turn it on here. */
856 if (warn_packed_bitfield_compat
== -1)
857 warn_packed_bitfield_compat
= 1;
859 /* Special format checking options don't work without -Wformat; warn if
863 warning (OPT_Wformat_y2k
,
864 "-Wformat-y2k ignored without -Wformat");
865 warning (OPT_Wformat_extra_args
,
866 "-Wformat-extra-args ignored without -Wformat");
867 warning (OPT_Wformat_zero_length
,
868 "-Wformat-zero-length ignored without -Wformat");
869 warning (OPT_Wformat_nonliteral
,
870 "-Wformat-nonliteral ignored without -Wformat");
871 warning (OPT_Wformat_contains_nul
,
872 "-Wformat-contains-nul ignored without -Wformat");
873 warning (OPT_Wformat_security
,
874 "-Wformat-security ignored without -Wformat");
877 /* -Wimplicit-function-declaration is enabled by default for C99. */
878 if (warn_implicit_function_declaration
== -1)
879 warn_implicit_function_declaration
= flag_isoc99
;
881 /* -Wimplicit-int is enabled by default for C99. */
882 if (warn_implicit_int
== -1)
883 warn_implicit_int
= flag_isoc99
;
885 /* -Wshift-overflow is enabled by default in C99 and C++11 modes. */
886 if (warn_shift_overflow
== -1)
887 warn_shift_overflow
= cxx_dialect
>= cxx11
|| flag_isoc99
;
889 /* -Wshift-negative-value is enabled by -Wextra in C99 and C++11 modes. */
890 if (warn_shift_negative_value
== -1)
891 warn_shift_negative_value
= (extra_warnings
892 && (cxx_dialect
>= cxx11
|| flag_isoc99
));
894 /* -Wregister is enabled by default in C++17. */
895 if (!global_options_set
.x_warn_register
)
896 warn_register
= cxx_dialect
>= cxx17
;
898 /* Declone C++ 'structors if -Os. */
899 if (flag_declone_ctor_dtor
== -1)
900 flag_declone_ctor_dtor
= optimize_size
;
902 if (warn_abi_version
== -1)
904 if (flag_abi_compat_version
!= -1)
905 warn_abi_version
= flag_abi_compat_version
;
907 warn_abi_version
= 0;
910 if (flag_abi_compat_version
== 1)
912 warning (0, "%<-fabi-compat-version=1%> is not supported, using =2");
913 flag_abi_compat_version
= 2;
915 else if (flag_abi_compat_version
== -1)
917 /* Generate compatibility aliases for ABI v11 (7.1) by default. */
918 flag_abi_compat_version
919 = (flag_abi_version
== 0 ? 11 : 0);
922 /* Change flag_abi_version to be the actual current ABI level for the
923 benefit of c_cpp_builtins. */
924 if (flag_abi_version
== 0)
925 flag_abi_version
= 12;
927 /* By default, enable the new inheriting constructor semantics along with ABI
928 11. New and old should coexist fine, but it is a change in what
929 artificial symbols are generated. */
930 if (!global_options_set
.x_flag_new_inheriting_ctors
)
931 flag_new_inheriting_ctors
= abi_version_at_least (11);
933 /* For GCC 7, only enable DR150 resolution by default if -std=c++17. */
934 if (!global_options_set
.x_flag_new_ttp
)
935 flag_new_ttp
= (cxx_dialect
>= cxx17
);
937 if (cxx_dialect
>= cxx11
)
939 /* If we're allowing C++0x constructs, don't warn about C++98
940 identifiers which are keywords in C++0x. */
941 warn_cxx11_compat
= 0;
942 cpp_opts
->cpp_warn_cxx11_compat
= 0;
944 if (warn_narrowing
== -1)
947 /* Unless -f{,no-}ext-numeric-literals has been used explicitly,
948 for -std=c++{11,14,17,2a} default to -fno-ext-numeric-literals. */
949 if (flag_iso
&& !global_options_set
.x_flag_ext_numeric_literals
)
950 cpp_opts
->ext_numeric_literals
= 0;
952 else if (warn_narrowing
== -1)
955 /* C++17 has stricter evaluation order requirements; let's use some of them
956 for earlier C++ as well, so chaining works as expected. */
958 && flag_strong_eval_order
== -1)
959 flag_strong_eval_order
= (cxx_dialect
>= cxx17
? 2 : 1);
961 /* Global sized deallocation is new in C++14. */
962 if (flag_sized_deallocation
== -1)
963 flag_sized_deallocation
= (cxx_dialect
>= cxx14
);
965 if (flag_extern_tls_init
)
967 if (!TARGET_SUPPORTS_ALIASES
|| !SUPPORTS_WEAK
)
969 /* Lazy TLS initialization for a variable in another TU requires
970 alias and weak reference support. */
971 if (flag_extern_tls_init
> 0)
972 sorry ("external TLS initialization functions not supported "
975 flag_extern_tls_init
= 0;
978 flag_extern_tls_init
= 1;
981 if (num_in_fnames
> 1)
982 error ("too many filenames given. Type %s --help for usage",
985 if (flag_preprocess_only
)
987 /* Open the output now. We must do so even if flag_no_output is
988 on, because there may be other output than from the actual
989 preprocessing (e.g. from -dM). */
990 if (out_fname
[0] == '\0')
993 out_stream
= fopen (out_fname
, "w");
995 if (out_stream
== NULL
)
997 fatal_error (input_location
, "opening output file %s: %m", out_fname
);
1001 init_pp_output (out_stream
);
1007 /* When writing a PCH file, avoid reading some other PCH file,
1008 because the default address space slot then can't be used
1009 for the output PCH file. */
1012 c_common_no_more_pch ();
1013 /* Only -g0 and -gdwarf* are supported with PCH, for other
1014 debug formats we warn here and refuse to load any PCH files. */
1015 if (write_symbols
!= NO_DEBUG
&& write_symbols
!= DWARF2_DEBUG
)
1016 warning (OPT_Wdeprecated
,
1017 "the \"%s\" debug format cannot be used with "
1018 "pre-compiled headers", debug_type_names
[write_symbols
]);
1020 else if (write_symbols
!= NO_DEBUG
&& write_symbols
!= DWARF2_DEBUG
)
1021 c_common_no_more_pch ();
1023 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1024 input_location
= UNKNOWN_LOCATION
;
1027 cb
= cpp_get_callbacks (parse_in
);
1028 cb
->file_change
= cb_file_change
;
1029 cb
->dir_change
= cb_dir_change
;
1030 cpp_post_options (parse_in
);
1031 init_global_opts_from_cpp (&global_options
, cpp_get_options (parse_in
));
1033 input_location
= UNKNOWN_LOCATION
;
1035 *pfilename
= this_input_filename
1036 = cpp_read_main_file (parse_in
, in_fnames
[0]);
1037 /* Don't do any compilation or preprocessing if there is no input file. */
1038 if (this_input_filename
== NULL
)
1044 if (flag_working_directory
1045 && flag_preprocess_only
&& !flag_no_line_commands
)
1046 pp_dir_change (parse_in
, get_src_pwd ());
1048 /* Disable LTO output when outputting a precompiled header. */
1049 if (pch_file
&& flag_lto
)
1052 flag_generate_lto
= 0;
1055 return flag_preprocess_only
;
1058 /* Front end initialization common to C, ObjC and C++. */
1060 c_common_init (void)
1062 /* Set up preprocessor arithmetic. Must be done after call to
1063 c_common_nodes_and_builtins for type nodes to be good. */
1064 cpp_opts
->precision
= TYPE_PRECISION (intmax_type_node
);
1065 cpp_opts
->char_precision
= TYPE_PRECISION (char_type_node
);
1066 cpp_opts
->int_precision
= TYPE_PRECISION (integer_type_node
);
1067 cpp_opts
->wchar_precision
= TYPE_PRECISION (wchar_type_node
);
1068 cpp_opts
->unsigned_wchar
= TYPE_UNSIGNED (wchar_type_node
);
1069 cpp_opts
->bytes_big_endian
= BYTES_BIG_ENDIAN
;
1071 /* This can't happen until after wchar_precision and bytes_big_endian
1073 cpp_init_iconv (parse_in
);
1078 fputs ("Compiler executable checksum: ", stderr
);
1079 for (i
= 0; i
< 16; i
++)
1080 fprintf (stderr
, "%02x", executable_checksum
[i
]);
1081 putc ('\n', stderr
);
1084 /* Has to wait until now so that cpplib has its hash table. */
1087 if (flag_preprocess_only
)
1089 c_finish_options ();
1090 preprocess_file (parse_in
);
1097 /* Initialize the integrated preprocessor after debug output has been
1098 initialized; loop over each input file. */
1100 c_common_parse_file (void)
1107 c_finish_options ();
1108 /* Open the dump file to use for the original dump output
1109 here, to be used during parsing for the current file. */
1110 original_dump_file
= dump_begin (TDI_original
, &original_dump_flags
);
1115 /* And end the main input file, if the debug writer wants it */
1116 if (debug_hooks
->start_end_main_source_file
)
1117 (*debug_hooks
->end_source_file
) (0);
1118 if (++i
>= num_in_fnames
)
1120 cpp_undef_all (parse_in
);
1121 cpp_clear_file_cache (parse_in
);
1123 = cpp_read_main_file (parse_in
, in_fnames
[i
]);
1124 if (original_dump_file
)
1126 dump_end (TDI_original
, original_dump_file
);
1127 original_dump_file
= NULL
;
1129 /* If an input file is missing, abandon further compilation.
1130 cpplib has issued a diagnostic. */
1131 if (!this_input_filename
)
1135 c_parse_final_cleanups ();
1138 /* Returns the appropriate dump file for PHASE to dump with FLAGS. */
1141 get_dump_info (int phase
, dump_flags_t
*flags
)
1143 gcc_assert (phase
== TDI_original
);
1145 *flags
= original_dump_flags
;
1146 return original_dump_file
;
1149 /* Common finish hook for the C, ObjC and C++ front ends. */
1151 c_common_finish (void)
1153 FILE *deps_stream
= NULL
;
1155 /* Note that we write the dependencies even if there are errors. This is
1156 useful for handling outdated generated headers that now trigger errors
1157 (for example, with #error) which would be resolved by re-generating
1158 them. In a sense, this complements -MG. */
1159 if (cpp_opts
->deps
.style
!= DEPS_NONE
)
1161 /* If -M or -MM was seen without -MF, default output to the
1164 deps_stream
= out_stream
;
1165 else if (deps_file
[0] == '-' && deps_file
[1] == '\0')
1166 deps_stream
= stdout
;
1169 deps_stream
= fopen (deps_file
, deps_append
? "a": "w");
1171 fatal_error (input_location
, "opening dependency file %s: %m",
1176 /* For performance, avoid tearing down cpplib's internal structures
1177 with cpp_destroy (). */
1178 cpp_finish (parse_in
, deps_stream
);
1180 if (deps_stream
&& deps_stream
!= out_stream
&& deps_stream
!= stdout
1181 && (ferror (deps_stream
) || fclose (deps_stream
)))
1182 fatal_error (input_location
, "closing dependency file %s: %m", deps_file
);
1184 if (out_stream
&& (ferror (out_stream
) || fclose (out_stream
)))
1185 fatal_error (input_location
, "when writing output to %s: %m", out_fname
);
1188 /* Either of two environment variables can specify output of
1189 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1190 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1191 and DEPS_TARGET is the target to mention in the deps. They also
1192 result in dependency information being appended to the output file
1193 rather than overwriting it, and like Sun's compiler
1194 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1196 check_deps_environment_vars (void)
1200 spec
= getenv ("DEPENDENCIES_OUTPUT");
1202 cpp_opts
->deps
.style
= DEPS_USER
;
1205 spec
= getenv ("SUNPRO_DEPENDENCIES");
1208 cpp_opts
->deps
.style
= DEPS_SYSTEM
;
1209 cpp_opts
->deps
.ignore_main_file
= true;
1215 /* Find the space before the DEPS_TARGET, if there is one. */
1216 char *s
= strchr (spec
, ' ');
1219 /* Let the caller perform MAKE quoting. */
1220 defer_opt (OPT_MT
, s
+ 1);
1224 /* Command line -MF overrides environment variables and default. */
1233 /* Handle deferred command line switches. */
1235 handle_deferred_opts (void)
1240 /* Avoid allocating the deps buffer if we don't need it.
1241 (This flag may be true without there having been -MT or -MQ
1242 options, but we'll still need the deps buffer.) */
1246 deps
= cpp_get_deps (parse_in
);
1248 for (i
= 0; i
< deferred_count
; i
++)
1250 struct deferred_opt
*opt
= &deferred_opts
[i
];
1252 if (opt
->code
== OPT_MT
|| opt
->code
== OPT_MQ
)
1253 deps_add_target (deps
, opt
->arg
, opt
->code
== OPT_MQ
);
1257 /* These settings are appropriate for GCC, but not necessarily so for
1258 cpplib as a library. */
1260 sanitize_cpp_opts (void)
1262 /* If we don't know what style of dependencies to output, complain
1263 if any other dependency switches have been given. */
1264 if (deps_seen
&& cpp_opts
->deps
.style
== DEPS_NONE
)
1265 error ("to generate dependencies you must specify either -M or -MM");
1267 /* -dM and dependencies suppress normal output; do it here so that
1268 the last -d[MDN] switch overrides earlier ones. */
1269 if (flag_dump_macros
== 'M')
1272 /* By default, -fdirectives-only implies -dD. This allows subsequent phases
1273 to perform proper macro expansion. */
1274 if (cpp_opts
->directives_only
&& !cpp_opts
->preprocessed
&& !flag_dump_macros
)
1275 flag_dump_macros
= 'D';
1277 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1278 -dM since at least glibc relies on -M -dM to work. */
1279 /* Also, flag_no_output implies flag_no_line_commands, always. */
1282 if (flag_dump_macros
!= 'M')
1283 flag_dump_macros
= 0;
1284 flag_dump_includes
= 0;
1285 flag_no_line_commands
= 1;
1287 else if (cpp_opts
->deps
.missing_files
)
1288 error ("-MG may only be used with -M or -MM");
1290 cpp_opts
->unsigned_char
= !flag_signed_char
;
1291 cpp_opts
->stdc_0_in_system_headers
= STDC_0_IN_SYSTEM_HEADERS
;
1293 /* Wlong-long is disabled by default. It is enabled by:
1294 [-Wpedantic | -Wtraditional] -std=[gnu|c]++98 ; or
1295 [-Wpedantic | -Wtraditional] -std=non-c99
1297 Either -Wlong-long or -Wno-long-long override any other settings.
1298 ??? These conditions should be handled in c.opt. */
1299 if (warn_long_long
== -1)
1301 warn_long_long
= ((pedantic
|| warn_traditional
)
1302 && (c_dialect_cxx () ? cxx_dialect
== cxx98
: !flag_isoc99
));
1303 cpp_opts
->cpp_warn_long_long
= warn_long_long
;
1306 /* If we're generating preprocessor output, emit current directory
1307 if explicitly requested or if debugging information is enabled.
1308 ??? Maybe we should only do it for debugging formats that
1309 actually output the current directory? */
1310 if (flag_working_directory
== -1)
1311 flag_working_directory
= (debug_info_level
!= DINFO_LEVEL_NONE
);
1313 if (warn_implicit_fallthrough
< 5)
1314 cpp_opts
->cpp_warn_implicit_fallthrough
= warn_implicit_fallthrough
;
1316 cpp_opts
->cpp_warn_implicit_fallthrough
= 0;
1318 if (cpp_opts
->directives_only
)
1320 if (cpp_warn_unused_macros
)
1321 error ("-fdirectives-only is incompatible with -Wunused_macros");
1322 if (cpp_opts
->traditional
)
1323 error ("-fdirectives-only is incompatible with -traditional");
1327 /* Add include path with a prefix at the front of its name. */
1329 add_prefixed_path (const char *suffix
, size_t chain
)
1333 size_t prefix_len
, suffix_len
;
1335 suffix_len
= strlen (suffix
);
1336 prefix
= iprefix
? iprefix
: cpp_GCC_INCLUDE_DIR
;
1337 prefix_len
= iprefix
? strlen (iprefix
) : cpp_GCC_INCLUDE_DIR_len
;
1339 path
= (char *) xmalloc (prefix_len
+ suffix_len
+ 1);
1340 memcpy (path
, prefix
, prefix_len
);
1341 memcpy (path
+ prefix_len
, suffix
, suffix_len
);
1342 path
[prefix_len
+ suffix_len
] = '\0';
1344 add_path (path
, chain
, 0, false);
1347 /* Handle -D, -U, -A, -imacros, and the first -include. */
1349 c_finish_options (void)
1351 if (!cpp_opts
->preprocessed
)
1355 cb_file_change (parse_in
,
1356 linemap_check_ordinary (linemap_add (line_table
,
1360 /* Make sure all of the builtins about to be declared have
1361 BUILTINS_LOCATION has their source_location. */
1362 source_location builtins_loc
= BUILTINS_LOCATION
;
1363 cpp_force_token_locations (parse_in
, &builtins_loc
);
1365 cpp_init_builtins (parse_in
, flag_hosted
);
1366 c_cpp_builtins (parse_in
);
1368 cpp_stop_forcing_token_locations (parse_in
);
1370 /* We're about to send user input to cpplib, so make it warn for
1371 things that we previously (when we sent it internal definitions)
1372 told it to not warn.
1374 C99 permits implementation-defined characters in identifiers.
1375 The documented meaning of -std= is to turn off extensions that
1376 conflict with the specified standard, and since a strictly
1377 conforming program cannot contain a '$', we do not condition
1378 their acceptance on the -std= setting. */
1379 cpp_opts
->warn_dollars
= (cpp_opts
->cpp_pedantic
&& !cpp_opts
->c99
);
1381 cb_file_change (parse_in
,
1382 linemap_check_ordinary (linemap_add (line_table
, LC_RENAME
, 0,
1383 _("<command-line>"), 0)));
1385 for (i
= 0; i
< deferred_count
; i
++)
1387 struct deferred_opt
*opt
= &deferred_opts
[i
];
1389 if (opt
->code
== OPT_D
)
1390 cpp_define (parse_in
, opt
->arg
);
1391 else if (opt
->code
== OPT_U
)
1392 cpp_undef (parse_in
, opt
->arg
);
1393 else if (opt
->code
== OPT_A
)
1395 if (opt
->arg
[0] == '-')
1396 cpp_unassert (parse_in
, opt
->arg
+ 1);
1398 cpp_assert (parse_in
, opt
->arg
);
1402 /* Start the main input file, if the debug writer wants it. */
1403 if (debug_hooks
->start_end_main_source_file
1404 && !flag_preprocess_only
)
1405 (*debug_hooks
->start_source_file
) (0, this_input_filename
);
1407 /* Handle -imacros after -D and -U. */
1408 for (i
= 0; i
< deferred_count
; i
++)
1410 struct deferred_opt
*opt
= &deferred_opts
[i
];
1412 if (opt
->code
== OPT_imacros
1413 && cpp_push_include (parse_in
, opt
->arg
))
1415 /* Disable push_command_line_include callback for now. */
1416 include_cursor
= deferred_count
+ 1;
1417 cpp_scan_nooutput (parse_in
);
1423 if (cpp_opts
->directives_only
)
1424 cpp_init_special_builtins (parse_in
);
1426 /* Start the main input file, if the debug writer wants it. */
1427 if (debug_hooks
->start_end_main_source_file
1428 && !flag_preprocess_only
)
1429 (*debug_hooks
->start_source_file
) (0, this_input_filename
);
1433 push_command_line_include ();
1436 /* Give CPP the next file given by -include, if any. */
1438 push_command_line_include (void)
1440 /* This can happen if disabled by -imacros for example.
1441 Punt so that we don't set "<command-line>" as the filename for
1443 if (include_cursor
> deferred_count
)
1446 if (!done_preinclude
)
1448 done_preinclude
= true;
1449 if (flag_hosted
&& std_inc
&& !cpp_opts
->preprocessed
)
1451 const char *preinc
= targetcm
.c_preinclude ();
1452 if (preinc
&& cpp_push_default_include (parse_in
, preinc
))
1457 pch_cpp_save_state ();
1459 while (include_cursor
< deferred_count
)
1461 struct deferred_opt
*opt
= &deferred_opts
[include_cursor
++];
1463 if (!cpp_opts
->preprocessed
&& opt
->code
== OPT_include
1464 && cpp_push_include (parse_in
, opt
->arg
))
1468 if (include_cursor
== deferred_count
)
1471 /* -Wunused-macros should only warn about macros defined hereafter. */
1472 cpp_opts
->warn_unused_macros
= cpp_warn_unused_macros
;
1473 /* Restore the line map from <command line>. */
1474 if (!cpp_opts
->preprocessed
)
1475 cpp_change_file (parse_in
, LC_RENAME
, this_input_filename
);
1477 /* Set this here so the client can change the option if it wishes,
1478 and after stacking the main file so we don't trace the main file. */
1479 line_table
->trace_includes
= cpp_opts
->print_include_names
;
1483 /* File change callback. Has to handle -include files. */
1485 cb_file_change (cpp_reader
* ARG_UNUSED (pfile
),
1486 const line_map_ordinary
*new_map
)
1488 if (flag_preprocess_only
)
1489 pp_file_change (new_map
);
1491 fe_file_change (new_map
);
1494 && (new_map
->reason
== LC_ENTER
|| new_map
->reason
== LC_RENAME
))
1496 /* Signal to plugins that a file is included. This could happen
1497 several times with the same file path, e.g. because of
1498 several '#include' or '#line' directives... */
1499 invoke_plugin_callbacks
1500 (PLUGIN_INCLUDE_FILE
,
1501 const_cast<char*> (ORDINARY_MAP_FILE_NAME (new_map
)));
1504 if (new_map
== 0 || (new_map
->reason
== LC_LEAVE
&& MAIN_FILE_P (new_map
)))
1506 pch_cpp_save_state ();
1507 push_command_line_include ();
1512 cb_dir_change (cpp_reader
* ARG_UNUSED (pfile
), const char *dir
)
1514 if (!set_src_pwd (dir
))
1515 warning (0, "too late for # directive to set debug directory");
1518 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1519 extensions if ISO). There is no concept of gnu94. */
1521 set_std_c89 (int c94
, int iso
)
1523 cpp_set_lang (parse_in
, c94
? CLK_STDC94
: iso
? CLK_STDC89
: CLK_GNUC89
);
1526 flag_no_gnu_keywords
= iso
;
1527 flag_no_nonansi_builtin
= iso
;
1531 lang_hooks
.name
= "GNU C89";
1534 /* Set the C 99 standard (without GNU extensions if ISO). */
1536 set_std_c99 (int iso
)
1538 cpp_set_lang (parse_in
, iso
? CLK_STDC99
: CLK_GNUC99
);
1540 flag_no_nonansi_builtin
= iso
;
1545 lang_hooks
.name
= "GNU C99";
1548 /* Set the C 11 standard (without GNU extensions if ISO). */
1550 set_std_c11 (int iso
)
1552 cpp_set_lang (parse_in
, iso
? CLK_STDC11
: CLK_GNUC11
);
1554 flag_no_nonansi_builtin
= iso
;
1559 lang_hooks
.name
= "GNU C11";
1562 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1564 set_std_cxx98 (int iso
)
1566 cpp_set_lang (parse_in
, iso
? CLK_CXX98
: CLK_GNUCXX
);
1567 flag_no_gnu_keywords
= iso
;
1568 flag_no_nonansi_builtin
= iso
;
1572 cxx_dialect
= cxx98
;
1573 lang_hooks
.name
= "GNU C++98";
1576 /* Set the C++ 2011 standard (without GNU extensions if ISO). */
1578 set_std_cxx11 (int iso
)
1580 cpp_set_lang (parse_in
, iso
? CLK_CXX11
: CLK_GNUCXX11
);
1581 flag_no_gnu_keywords
= iso
;
1582 flag_no_nonansi_builtin
= iso
;
1584 /* C++11 includes the C99 standard library. */
1587 cxx_dialect
= cxx11
;
1588 lang_hooks
.name
= "GNU C++11";
1591 /* Set the C++ 2014 standard (without GNU extensions if ISO). */
1593 set_std_cxx14 (int iso
)
1595 cpp_set_lang (parse_in
, iso
? CLK_CXX14
: CLK_GNUCXX14
);
1596 flag_no_gnu_keywords
= iso
;
1597 flag_no_nonansi_builtin
= iso
;
1599 /* C++14 includes the C99 standard library. */
1602 cxx_dialect
= cxx14
;
1603 lang_hooks
.name
= "GNU C++14";
1606 /* Set the C++ 2017 standard (without GNU extensions if ISO). */
1608 set_std_cxx17 (int iso
)
1610 cpp_set_lang (parse_in
, iso
? CLK_CXX17
: CLK_GNUCXX17
);
1611 flag_no_gnu_keywords
= iso
;
1612 flag_no_nonansi_builtin
= iso
;
1614 /* C++17 includes the C11 standard library. */
1618 cxx_dialect
= cxx17
;
1619 lang_hooks
.name
= "GNU C++17";
1622 /* Set the C++ 202a draft standard (without GNU extensions if ISO). */
1624 set_std_cxx2a (int iso
)
1626 cpp_set_lang (parse_in
, iso
? CLK_CXX2A
: CLK_GNUCXX2A
);
1627 flag_no_gnu_keywords
= iso
;
1628 flag_no_nonansi_builtin
= iso
;
1630 /* C++17 includes the C11 standard library. */
1634 cxx_dialect
= cxx2a
;
1635 lang_hooks
.name
= "GNU C++17"; /* Pretend C++17 until standardization. */
1638 /* Args to -d specify what to dump. Silently ignore
1639 unrecognized options; they may be aimed at toplev.c. */
1641 handle_OPT_d (const char *arg
)
1645 while ((c
= *arg
++) != '\0')
1648 case 'M': /* Dump macros only. */
1649 case 'N': /* Dump names. */
1650 case 'D': /* Dump definitions. */
1651 case 'U': /* Dump used macros. */
1652 flag_dump_macros
= c
;
1656 flag_dump_includes
= 1;