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 int original_dump_flags
;
105 static FILE *class_dump_file
= NULL
;
106 static int class_dump_flags
;
108 /* Whether any standard preincluded header has been preincluded. */
109 static bool done_preinclude
;
111 static void handle_OPT_d (const char *);
112 static void set_std_cxx98 (int);
113 static void set_std_cxx11 (int);
114 static void set_std_cxx14 (int);
115 static void set_std_cxx1z (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 check_deps_environment_vars (void);
120 static void handle_deferred_opts (void);
121 static void sanitize_cpp_opts (void);
122 static void add_prefixed_path (const char *, size_t);
123 static void push_command_line_include (void);
124 static void cb_file_change (cpp_reader
*, const line_map_ordinary
*);
125 static void cb_dir_change (cpp_reader
*, const char *);
126 static void c_finish_options (void);
128 #ifndef STDC_0_IN_SYSTEM_HEADERS
129 #define STDC_0_IN_SYSTEM_HEADERS 0
132 /* Holds switches parsed by c_common_handle_option (), but whose
133 handling is deferred to c_common_post_options (). */
134 static void defer_opt (enum opt_code
, const char *);
135 static struct deferred_opt
142 extern const unsigned int
143 c_family_lang_mask
= (CL_C
| CL_CXX
| CL_ObjC
| CL_ObjCXX
);
145 /* Defer option CODE with argument ARG. */
147 defer_opt (enum opt_code code
, const char *arg
)
149 deferred_opts
[deferred_count
].code
= code
;
150 deferred_opts
[deferred_count
].arg
= arg
;
154 /* Return language mask for option parsing. */
156 c_common_option_lang_mask (void)
158 static const unsigned int lang_flags
[] = {CL_C
, CL_ObjC
, CL_CXX
, CL_ObjCXX
};
160 return lang_flags
[c_language
];
163 /* Diagnostic finalizer for C/C++/Objective-C/Objective-C++. */
165 c_diagnostic_finalizer (diagnostic_context
*context
,
166 diagnostic_info
*diagnostic
)
168 diagnostic_show_locus (context
, diagnostic
->richloc
, diagnostic
->kind
);
169 /* By default print macro expansion contexts in the diagnostic
170 finalizer -- for tokens resulting from macro expansion. */
171 virt_loc_aware_diagnostic_finalizer (context
, diagnostic
);
172 pp_destroy_prefix (context
->printer
);
173 pp_flush (context
->printer
);
176 /* Common default settings for diagnostics. */
178 c_common_diagnostics_set_defaults (diagnostic_context
*context
)
180 diagnostic_finalizer (context
) = c_diagnostic_finalizer
;
181 context
->opt_permissive
= OPT_fpermissive
;
184 /* Whether options from all C-family languages should be accepted
186 static bool accept_all_c_family_options
= false;
188 /* Return whether to complain about a wrong-language option. */
190 c_common_complain_wrong_lang_p (const struct cl_option
*option
)
192 if (accept_all_c_family_options
193 && (option
->flags
& c_family_lang_mask
))
199 /* Initialize options structure OPTS. */
201 c_common_init_options_struct (struct gcc_options
*opts
)
203 opts
->x_flag_exceptions
= c_dialect_cxx ();
204 opts
->x_warn_pointer_arith
= c_dialect_cxx ();
205 opts
->x_warn_write_strings
= c_dialect_cxx ();
206 opts
->x_flag_warn_unused_result
= true;
208 /* By default, C99-like requirements for complex multiply and divide. */
209 opts
->x_flag_complex_method
= 2;
212 /* Common initialization before calling option handlers. */
214 c_common_init_options (unsigned int decoded_options_count
,
215 struct cl_decoded_option
*decoded_options
)
218 struct cpp_callbacks
*cb
;
221 = new (ggc_alloc
<string_concat_db
> ()) string_concat_db ();
223 parse_in
= cpp_create_reader (c_dialect_cxx () ? CLK_GNUCXX
: CLK_GNUC89
,
224 ident_hash
, line_table
);
225 cb
= cpp_get_callbacks (parse_in
);
226 cb
->error
= c_cpp_error
;
228 cpp_opts
= cpp_get_options (parse_in
);
229 cpp_opts
->dollars_in_ident
= DOLLARS_IN_IDENTIFIERS
;
230 cpp_opts
->objc
= c_dialect_objc ();
232 /* Reset to avoid warnings on internal definitions. We set it just
233 before passing on command-line options to cpplib. */
234 cpp_opts
->warn_dollars
= 0;
236 deferred_opts
= XNEWVEC (struct deferred_opt
, decoded_options_count
);
238 if (c_language
== clk_c
)
240 /* The default for C is gnu11. */
241 set_std_c11 (false /* ISO */);
243 /* If preprocessing assembly language, accept any of the C-family
244 front end options since the driver may pass them through. */
245 for (i
= 1; i
< decoded_options_count
; i
++)
246 if (decoded_options
[i
].opt_index
== OPT_lang_asm
)
248 accept_all_c_family_options
= true;
253 /* Set C++ standard to C++14 if not specified on the command line. */
254 if (c_dialect_cxx ())
255 set_std_cxx14 (/*ISO*/false);
257 global_dc
->colorize_source_p
= true;
260 /* Handle switch SCODE with argument ARG. VALUE is true, unless no-
261 form of an -f or -W option was given. Returns false if the switch was
262 invalid, true if valid. Use HANDLERS in recursive handle_option calls. */
264 c_common_handle_option (size_t scode
, const char *arg
, int value
,
265 int kind
, location_t loc
,
266 const struct cl_option_handlers
*handlers
)
268 const struct cl_option
*option
= &cl_options
[scode
];
269 enum opt_code code
= (enum opt_code
) scode
;
272 /* Prevent resetting the language standard to a C dialect when the driver
273 has already determined that we're looking at assembler input. */
274 bool preprocessing_asm_p
= (cpp_get_options (parse_in
)->lang
== CLK_ASM
);
279 if (cl_options
[code
].flags
& c_family_lang_mask
)
281 if ((option
->flags
& CL_TARGET
)
282 && ! targetcm
.handle_c_option (scode
, arg
, value
))
289 case OPT__output_pch_
:
294 defer_opt (code
, arg
);
298 cpp_opts
->discard_comments
= 0;
302 cpp_opts
->discard_comments
= 0;
303 cpp_opts
->discard_comments_in_macro_exp
= 0;
307 defer_opt (code
, arg
);
311 cpp_opts
->print_include_names
= 1;
315 TARGET_OPTF (xstrdup (arg
));
319 if (strcmp (arg
, "-"))
320 add_path (xstrdup (arg
), BRACKET
, 0, true);
323 if (quote_chain_split
)
324 error ("-I- specified twice");
325 quote_chain_split
= true;
326 split_quote_chain ();
327 inform (input_location
, "obsolete option -I- used, please use -iquote instead");
333 /* When doing dependencies with -M or -MM, suppress normal
334 preprocessed output, but still do -dM etc. as software
335 depends on this. Preprocessed output does occur if -MD, -MMD
336 or environment var dependency generation is used. */
337 cpp_opts
->deps
.style
= (code
== OPT_M
? DEPS_SYSTEM
: DEPS_USER
);
343 cpp_opts
->deps
.style
= (code
== OPT_MD
? DEPS_SYSTEM
: DEPS_USER
);
344 cpp_opts
->deps
.need_preprocessor_output
= true;
355 cpp_opts
->deps
.missing_files
= true;
360 cpp_opts
->deps
.phony_targets
= true;
366 defer_opt (code
, arg
);
370 flag_no_line_commands
= 1;
374 defer_opt (code
, arg
);
378 /* ??? Don't add new options here. Use LangEnabledBy in c.opt. */
380 cpp_opts
->warn_num_sign_change
= value
;
383 case OPT_Walloca_larger_than_
:
385 inform (loc
, "-Walloca-larger-than=0 is meaningless");
388 case OPT_Wvla_larger_than_
:
390 inform (loc
, "-Wvla-larger-than=0 is meaningless");
393 case OPT_Wunknown_pragmas
:
394 /* Set to greater than 1, so that even unknown pragmas in
395 system headers will be warned about. */
396 /* ??? There is no way to handle this automatically for now. */
397 warn_unknown_pragmas
= value
* 2;
401 if (!c_dialect_cxx ())
402 set_std_c89 (false, true);
404 set_std_cxx98 (true);
415 warning (0, "%<-Wabi=1%> is not supported, using =2");
418 warn_abi_version
= value
;
419 if (flag_abi_compat_version
== -1)
420 flag_abi_compat_version
= value
;
423 case OPT_fcanonical_system_headers
:
424 cpp_opts
->canonical_system_headers
= value
;
427 case OPT_fcond_mismatch
:
428 if (!c_dialect_cxx ())
430 flag_cond_mismatch
= value
;
433 warning (0, "switch %qs is no longer supported", option
->opt_text
);
440 disable_builtin_function (arg
);
443 case OPT_fdirectives_only
:
444 cpp_opts
->directives_only
= value
;
447 case OPT_fdollars_in_identifiers
:
448 cpp_opts
->dollars_in_ident
= value
;
451 case OPT_ffreestanding
:
456 flag_no_builtin
= !value
;
459 case OPT_fconstant_string_class_
:
460 constant_string_class_name
= arg
;
463 case OPT_fextended_identifiers
:
464 cpp_opts
->extended_identifiers
= value
;
467 case OPT_foperator_names
:
468 cpp_opts
->operator_names
= value
;
472 cpp_opts
->restore_pch_deps
= value
;
475 case OPT_fpch_preprocess
:
476 flag_pch_preprocess
= value
;
479 case OPT_fpermissive
:
480 flag_permissive
= value
;
481 global_dc
->permissive
= value
;
484 case OPT_fpreprocessed
:
485 cpp_opts
->preprocessed
= value
;
492 case OPT_ftrack_macro_expansion
:
497 case OPT_ftrack_macro_expansion_
:
498 if (arg
&& *arg
!= '\0')
499 cpp_opts
->track_macro_expansion
= value
;
501 cpp_opts
->track_macro_expansion
= 2;
505 flag_use_repository
= value
;
507 flag_implicit_templates
= 0;
511 /* It is documented that we silently ignore silly values. */
512 if (value
>= 1 && value
<= 100)
513 cpp_opts
->tabstop
= value
;
516 case OPT_fexec_charset_
:
517 cpp_opts
->narrow_charset
= arg
;
520 case OPT_fwide_exec_charset_
:
521 cpp_opts
->wide_charset
= arg
;
524 case OPT_finput_charset_
:
525 cpp_opts
->input_charset
= arg
;
528 case OPT_ftemplate_depth_
:
529 max_tinst_depth
= value
;
532 case OPT_fvisibility_inlines_hidden
:
533 visibility_options
.inlines_hidden
= value
;
536 case OPT_femit_struct_debug_baseonly
:
537 set_struct_debug_option (&global_options
, loc
, "base");
540 case OPT_femit_struct_debug_reduced
:
541 set_struct_debug_option (&global_options
, loc
,
542 "dir:ord:sys,dir:gen:any,ind:base");
545 case OPT_femit_struct_debug_detailed_
:
546 set_struct_debug_option (&global_options
, loc
, arg
);
549 case OPT_fext_numeric_literals
:
550 cpp_opts
->ext_numeric_literals
= value
;
554 add_path (xstrdup (arg
), AFTER
, 0, true);
559 defer_opt (code
, arg
);
571 add_path (xstrdup (arg
), QUOTE
, 0, true);
579 add_path (xstrdup (arg
), SYSTEM
, 0, true);
582 case OPT_iwithprefix
:
583 add_prefixed_path (arg
, SYSTEM
);
586 case OPT_iwithprefixbefore
:
587 add_prefixed_path (arg
, BRACKET
);
591 cpp_set_lang (parse_in
, CLK_ASM
);
592 cpp_opts
->dollars_in_ident
= false;
607 error ("output filename specified twice");
610 case OPT_print_objc_runtime_info
:
611 print_struct_values
= 1;
619 case OPT_std_gnu__98
:
620 if (!preprocessing_asm_p
)
621 set_std_cxx98 (code
== OPT_std_c__98
/* ISO */);
625 case OPT_std_gnu__11
:
626 if (!preprocessing_asm_p
)
627 set_std_cxx11 (code
== OPT_std_c__11
/* ISO */);
631 case OPT_std_gnu__14
:
632 if (!preprocessing_asm_p
)
633 set_std_cxx14 (code
== OPT_std_c__14
/* ISO */);
637 case OPT_std_gnu__1z
:
638 if (!preprocessing_asm_p
)
639 set_std_cxx1z (code
== OPT_std_c__1z
/* ISO */);
643 case OPT_std_iso9899_199409
:
644 if (!preprocessing_asm_p
)
645 set_std_c89 (code
== OPT_std_iso9899_199409
/* c94 */, true /* ISO */);
649 if (!preprocessing_asm_p
)
650 set_std_c89 (false /* c94 */, false /* ISO */);
654 if (!preprocessing_asm_p
)
655 set_std_c99 (true /* ISO */);
659 if (!preprocessing_asm_p
)
660 set_std_c99 (false /* ISO */);
664 if (!preprocessing_asm_p
)
665 set_std_c11 (true /* ISO */);
669 if (!preprocessing_asm_p
)
670 set_std_c11 (false /* ISO */);
674 cpp_opts
->trigraphs
= 1;
677 case OPT_traditional_cpp
:
678 cpp_opts
->traditional
= 1;
689 C_handle_option_auto (&global_options
, &global_options_set
,
691 c_family_lang_mask
, kind
,
692 loc
, handlers
, global_dc
);
696 ObjC_handle_option_auto (&global_options
, &global_options_set
,
698 c_family_lang_mask
, kind
,
699 loc
, handlers
, global_dc
);
703 CXX_handle_option_auto (&global_options
, &global_options_set
,
705 c_family_lang_mask
, kind
,
706 loc
, handlers
, global_dc
);
710 ObjCXX_handle_option_auto (&global_options
, &global_options_set
,
712 c_family_lang_mask
, kind
,
713 loc
, handlers
, global_dc
);
720 cpp_handle_option_auto (&global_options
, scode
, cpp_opts
);
724 /* Default implementation of TARGET_HANDLE_C_OPTION. */
727 default_handle_c_option (size_t code ATTRIBUTE_UNUSED
,
728 const char *arg ATTRIBUTE_UNUSED
,
729 int value ATTRIBUTE_UNUSED
)
734 /* Post-switch processing. */
736 c_common_post_options (const char **pfilename
)
738 struct cpp_callbacks
*cb
;
740 /* Canonicalize the input and output filenames. */
741 if (in_fnames
== NULL
)
743 in_fnames
= XNEWVEC (const char *, 1);
746 else if (strcmp (in_fnames
[0], "-") == 0)
749 error ("cannot use %<-%> as input filename for a precompiled header");
754 if (out_fname
== NULL
|| !strcmp (out_fname
, "-"))
757 if (cpp_opts
->deps
.style
== DEPS_NONE
)
758 check_deps_environment_vars ();
760 handle_deferred_opts ();
762 sanitize_cpp_opts ();
764 register_include_chains (parse_in
, sysroot
, iprefix
, imultilib
,
765 std_inc
, std_cxx_inc
&& c_dialect_cxx (), verbose
);
767 #ifdef C_COMMON_OVERRIDE_OPTIONS
768 /* Some machines may reject certain combinations of C
769 language-specific options. */
770 C_COMMON_OVERRIDE_OPTIONS
;
773 /* Excess precision other than "fast" requires front-end
775 if (c_dialect_cxx ())
777 if (flag_excess_precision_cmdline
== EXCESS_PRECISION_STANDARD
)
778 sorry ("-fexcess-precision=standard for C++");
779 flag_excess_precision_cmdline
= EXCESS_PRECISION_FAST
;
781 else if (flag_excess_precision_cmdline
== EXCESS_PRECISION_DEFAULT
)
782 flag_excess_precision_cmdline
= (flag_iso
783 ? EXCESS_PRECISION_STANDARD
784 : EXCESS_PRECISION_FAST
);
786 /* ISO C restricts floating-point expression contraction to within
787 source-language expressions (-ffp-contract=on, currently an alias
788 for -ffp-contract=off). */
791 && (global_options_set
.x_flag_fp_contract_mode
792 == (enum fp_contract_mode
) 0)
793 && flag_unsafe_math_optimizations
== 0)
794 flag_fp_contract_mode
= FP_CONTRACT_OFF
;
796 /* If we are compiling C, and we are outside of a standards mode,
797 we can permit the new values from ISO/IEC TS 18661-3 for
798 FLT_EVAL_METHOD. Otherwise, we must restrict the possible values to
799 the set specified in ISO C99/C11. */
802 && (global_options_set
.x_flag_permitted_flt_eval_methods
803 == PERMITTED_FLT_EVAL_METHODS_DEFAULT
))
804 flag_permitted_flt_eval_methods
= PERMITTED_FLT_EVAL_METHODS_TS_18661
;
806 flag_permitted_flt_eval_methods
= PERMITTED_FLT_EVAL_METHODS_C11
;
808 /* By default we use C99 inline semantics in GNU99 or C99 mode. C99
809 inline semantics are not supported in GNU89 or C89 mode. */
810 if (flag_gnu89_inline
== -1)
811 flag_gnu89_inline
= !flag_isoc99
;
812 else if (!flag_gnu89_inline
&& !flag_isoc99
)
813 error ("-fno-gnu89-inline is only supported in GNU99 or C99 mode");
815 /* Default to ObjC sjlj exception handling if NeXT runtime. */
816 if (flag_objc_sjlj_exceptions
< 0)
817 flag_objc_sjlj_exceptions
= flag_next_runtime
;
818 if (flag_objc_exceptions
&& !flag_objc_sjlj_exceptions
)
821 /* If -ffreestanding, -fno-hosted or -fno-builtin then disable
822 pattern recognition. */
823 if (!global_options_set
.x_flag_tree_loop_distribute_patterns
825 flag_tree_loop_distribute_patterns
= 0;
827 /* -Woverlength-strings is off by default, but is enabled by -Wpedantic.
828 It is never enabled in C++, as the minimum limit is not normative
830 if (c_dialect_cxx ())
831 warn_overlength_strings
= 0;
833 /* Wmain is enabled by default in C++ but not in C. */
834 /* Wmain is disabled by default for -ffreestanding (!flag_hosted),
835 even if -Wall or -Wpedantic was given (warn_main will be 2 if set
836 by -Wall, 1 if set by -Wmain). */
838 warn_main
= (c_dialect_cxx () && flag_hosted
) ? 1 : 0;
839 else if (warn_main
== 2)
840 warn_main
= flag_hosted
? 1 : 0;
842 /* In C, -Wall and -Wc++-compat enable -Wenum-compare; if it has not
843 yet been set, it is disabled by default. In C++, it is enabled
845 if (warn_enum_compare
== -1)
846 warn_enum_compare
= c_dialect_cxx () ? 1 : 0;
848 /* -Wpacked-bitfield-compat is on by default for the C languages. The
849 warning is issued in stor-layout.c which is not part of the front-end so
850 we need to selectively turn it on here. */
851 if (warn_packed_bitfield_compat
== -1)
852 warn_packed_bitfield_compat
= 1;
854 /* Special format checking options don't work without -Wformat; warn if
858 warning (OPT_Wformat_y2k
,
859 "-Wformat-y2k ignored without -Wformat");
860 warning (OPT_Wformat_extra_args
,
861 "-Wformat-extra-args ignored without -Wformat");
862 warning (OPT_Wformat_zero_length
,
863 "-Wformat-zero-length ignored without -Wformat");
864 warning (OPT_Wformat_nonliteral
,
865 "-Wformat-nonliteral ignored without -Wformat");
866 warning (OPT_Wformat_contains_nul
,
867 "-Wformat-contains-nul ignored without -Wformat");
868 warning (OPT_Wformat_security
,
869 "-Wformat-security ignored without -Wformat");
872 /* -Wimplicit-function-declaration is enabled by default for C99. */
873 if (warn_implicit_function_declaration
== -1)
874 warn_implicit_function_declaration
= flag_isoc99
;
876 /* -Wimplicit-int is enabled by default for C99. */
877 if (warn_implicit_int
== -1)
878 warn_implicit_int
= flag_isoc99
;
880 /* -Wshift-overflow is enabled by default in C99 and C++11 modes. */
881 if (warn_shift_overflow
== -1)
882 warn_shift_overflow
= cxx_dialect
>= cxx11
|| flag_isoc99
;
884 /* -Wshift-negative-value is enabled by -Wextra in C99 and C++11 modes. */
885 if (warn_shift_negative_value
== -1)
886 warn_shift_negative_value
= (extra_warnings
887 && (cxx_dialect
>= cxx11
|| flag_isoc99
));
889 /* -Wregister is enabled by default in C++17. */
890 if (!global_options_set
.x_warn_register
)
891 warn_register
= cxx_dialect
>= cxx1z
;
893 /* Declone C++ 'structors if -Os. */
894 if (flag_declone_ctor_dtor
== -1)
895 flag_declone_ctor_dtor
= optimize_size
;
897 if (warn_abi_version
== -1)
899 if (flag_abi_compat_version
!= -1)
900 warn_abi_version
= flag_abi_compat_version
;
902 warn_abi_version
= 0;
905 if (flag_abi_compat_version
== 1)
907 warning (0, "%<-fabi-compat-version=1%> is not supported, using =2");
908 flag_abi_compat_version
= 2;
910 else if (flag_abi_compat_version
== -1)
912 /* Generate compatibility aliases for ABI v10 (6.1) by default. */
913 flag_abi_compat_version
914 = (flag_abi_version
== 0 ? 10 : 0);
917 /* Change flag_abi_version to be the actual current ABI level for the
918 benefit of c_cpp_builtins. */
919 if (flag_abi_version
== 0)
920 flag_abi_version
= 11;
922 /* By default, enable the new inheriting constructor semantics along with ABI
923 11. New and old should coexist fine, but it is a change in what
924 artificial symbols are generated. */
925 if (!global_options_set
.x_flag_new_inheriting_ctors
)
926 flag_new_inheriting_ctors
= abi_version_at_least (11);
928 /* For GCC 7, only enable DR150 resolution by default if -std=c++1z. */
929 if (!global_options_set
.x_flag_new_ttp
)
930 flag_new_ttp
= (cxx_dialect
>= cxx1z
);
932 if (cxx_dialect
>= cxx11
)
934 /* If we're allowing C++0x constructs, don't warn about C++98
935 identifiers which are keywords in C++0x. */
936 warn_cxx11_compat
= 0;
937 cpp_opts
->cpp_warn_cxx11_compat
= 0;
939 if (warn_narrowing
== -1)
942 /* Unless -f{,no-}ext-numeric-literals has been used explicitly,
943 for -std=c++{11,14,1z} default to -fno-ext-numeric-literals. */
944 if (flag_iso
&& !global_options_set
.x_flag_ext_numeric_literals
)
945 cpp_opts
->ext_numeric_literals
= 0;
947 else if (warn_narrowing
== -1)
950 /* C++17 has stricter evaluation order requirements; let's use some of them
951 for earlier C++ as well, so chaining works as expected. */
953 && flag_strong_eval_order
== -1)
954 flag_strong_eval_order
= (cxx_dialect
>= cxx1z
? 2 : 1);
956 /* Global sized deallocation is new in C++14. */
957 if (flag_sized_deallocation
== -1)
958 flag_sized_deallocation
= (cxx_dialect
>= cxx14
);
960 if (flag_extern_tls_init
)
962 #if !defined (ASM_OUTPUT_DEF) || !SUPPORTS_WEAK
963 /* Lazy TLS initialization for a variable in another TU requires
964 alias and weak reference support. */
965 if (flag_extern_tls_init
> 0)
966 sorry ("external TLS initialization functions not supported "
968 flag_extern_tls_init
= 0;
970 flag_extern_tls_init
= 1;
974 if (flag_preprocess_only
)
976 /* Open the output now. We must do so even if flag_no_output is
977 on, because there may be other output than from the actual
978 preprocessing (e.g. from -dM). */
979 if (out_fname
[0] == '\0')
982 out_stream
= fopen (out_fname
, "w");
984 if (out_stream
== NULL
)
986 fatal_error (input_location
, "opening output file %s: %m", out_fname
);
990 if (num_in_fnames
> 1)
991 error ("too many filenames given. Type %s --help for usage",
994 init_pp_output (out_stream
);
1000 /* When writing a PCH file, avoid reading some other PCH file,
1001 because the default address space slot then can't be used
1002 for the output PCH file. */
1005 c_common_no_more_pch ();
1006 /* Only -g0 and -gdwarf* are supported with PCH, for other
1007 debug formats we warn here and refuse to load any PCH files. */
1008 if (write_symbols
!= NO_DEBUG
&& write_symbols
!= DWARF2_DEBUG
)
1009 warning (OPT_Wdeprecated
,
1010 "the \"%s\" debug format cannot be used with "
1011 "pre-compiled headers", debug_type_names
[write_symbols
]);
1013 else if (write_symbols
!= NO_DEBUG
&& write_symbols
!= DWARF2_DEBUG
)
1014 c_common_no_more_pch ();
1016 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1017 input_location
= UNKNOWN_LOCATION
;
1020 cb
= cpp_get_callbacks (parse_in
);
1021 cb
->file_change
= cb_file_change
;
1022 cb
->dir_change
= cb_dir_change
;
1023 cpp_post_options (parse_in
);
1024 init_global_opts_from_cpp (&global_options
, cpp_get_options (parse_in
));
1026 input_location
= UNKNOWN_LOCATION
;
1028 *pfilename
= this_input_filename
1029 = cpp_read_main_file (parse_in
, in_fnames
[0]);
1030 /* Don't do any compilation or preprocessing if there is no input file. */
1031 if (this_input_filename
== NULL
)
1037 if (flag_working_directory
1038 && flag_preprocess_only
&& !flag_no_line_commands
)
1039 pp_dir_change (parse_in
, get_src_pwd ());
1041 /* Disable LTO output when outputting a precompiled header. */
1042 if (pch_file
&& flag_lto
)
1045 flag_generate_lto
= 0;
1048 return flag_preprocess_only
;
1051 /* Front end initialization common to C, ObjC and C++. */
1053 c_common_init (void)
1055 /* Set up preprocessor arithmetic. Must be done after call to
1056 c_common_nodes_and_builtins for type nodes to be good. */
1057 cpp_opts
->precision
= TYPE_PRECISION (intmax_type_node
);
1058 cpp_opts
->char_precision
= TYPE_PRECISION (char_type_node
);
1059 cpp_opts
->int_precision
= TYPE_PRECISION (integer_type_node
);
1060 cpp_opts
->wchar_precision
= TYPE_PRECISION (wchar_type_node
);
1061 cpp_opts
->unsigned_wchar
= TYPE_UNSIGNED (wchar_type_node
);
1062 cpp_opts
->bytes_big_endian
= BYTES_BIG_ENDIAN
;
1064 /* This can't happen until after wchar_precision and bytes_big_endian
1066 cpp_init_iconv (parse_in
);
1071 fputs ("Compiler executable checksum: ", stderr
);
1072 for (i
= 0; i
< 16; i
++)
1073 fprintf (stderr
, "%02x", executable_checksum
[i
]);
1074 putc ('\n', stderr
);
1077 /* Has to wait until now so that cpplib has its hash table. */
1080 if (flag_preprocess_only
)
1082 c_finish_options ();
1083 preprocess_file (parse_in
);
1090 /* Initialize the integrated preprocessor after debug output has been
1091 initialized; loop over each input file. */
1093 c_common_parse_file (void)
1100 c_finish_options ();
1101 /* Open the dump files to use for the original and class dump output
1102 here, to be used during parsing for the current file. */
1103 original_dump_file
= dump_begin (TDI_original
, &original_dump_flags
);
1104 class_dump_file
= dump_begin (TDI_class
, &class_dump_flags
);
1109 /* And end the main input file, if the debug writer wants it */
1110 if (debug_hooks
->start_end_main_source_file
)
1111 (*debug_hooks
->end_source_file
) (0);
1112 if (++i
>= num_in_fnames
)
1114 cpp_undef_all (parse_in
);
1115 cpp_clear_file_cache (parse_in
);
1117 = cpp_read_main_file (parse_in
, in_fnames
[i
]);
1118 if (original_dump_file
)
1120 dump_end (TDI_original
, original_dump_file
);
1121 original_dump_file
= NULL
;
1123 if (class_dump_file
)
1125 dump_end (TDI_class
, class_dump_file
);
1126 class_dump_file
= NULL
;
1128 /* If an input file is missing, abandon further compilation.
1129 cpplib has issued a diagnostic. */
1130 if (!this_input_filename
)
1134 c_parse_final_cleanups ();
1137 /* Returns the appropriate dump file for PHASE to dump with FLAGS. */
1139 get_dump_info (int phase
, int *flags
)
1141 gcc_assert (phase
== TDI_original
|| phase
== TDI_class
);
1142 if (phase
== TDI_original
)
1144 *flags
= original_dump_flags
;
1145 return original_dump_file
;
1149 *flags
= class_dump_flags
;
1150 return class_dump_file
;
1154 /* Common finish hook for the C, ObjC and C++ front ends. */
1156 c_common_finish (void)
1158 FILE *deps_stream
= NULL
;
1160 /* Don't write the deps file if there are errors. */
1161 if (cpp_opts
->deps
.style
!= DEPS_NONE
&& !seen_error ())
1163 /* If -M or -MM was seen without -MF, default output to the
1166 deps_stream
= out_stream
;
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
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 draft 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++11 includes the C99 standard library. */
1602 cxx_dialect
= cxx14
;
1603 lang_hooks
.name
= "GNU C++14";
1606 /* Set the C++ 201z draft standard (without GNU extensions if ISO). */
1608 set_std_cxx1z (int iso
)
1610 cpp_set_lang (parse_in
, iso
? CLK_CXX1Z
: CLK_GNUCXX1Z
);
1611 flag_no_gnu_keywords
= iso
;
1612 flag_no_nonansi_builtin
= iso
;
1614 /* C++11 includes the C99 standard library. */
1618 cxx_dialect
= cxx1z
;
1619 lang_hooks
.name
= "GNU C++14"; /* Pretend C++14 till standarization. */
1622 /* Args to -d specify what to dump. Silently ignore
1623 unrecognized options; they may be aimed at toplev.c. */
1625 handle_OPT_d (const char *arg
)
1629 while ((c
= *arg
++) != '\0')
1632 case 'M': /* Dump macros only. */
1633 case 'N': /* Dump names. */
1634 case 'D': /* Dump definitions. */
1635 case 'U': /* Dump used macros. */
1636 flag_dump_macros
= c
;
1640 flag_dump_includes
= 1;