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_cxx1z (int);
114 static void set_std_c89 (int, int);
115 static void set_std_c99 (int);
116 static void set_std_c11 (int);
117 static void check_deps_environment_vars (void);
118 static void handle_deferred_opts (void);
119 static void sanitize_cpp_opts (void);
120 static void add_prefixed_path (const char *, size_t);
121 static void push_command_line_include (void);
122 static void cb_file_change (cpp_reader
*, const line_map_ordinary
*);
123 static void cb_dir_change (cpp_reader
*, const char *);
124 static void c_finish_options (void);
126 #ifndef STDC_0_IN_SYSTEM_HEADERS
127 #define STDC_0_IN_SYSTEM_HEADERS 0
130 /* Holds switches parsed by c_common_handle_option (), but whose
131 handling is deferred to c_common_post_options (). */
132 static void defer_opt (enum opt_code
, const char *);
133 static struct deferred_opt
140 extern const unsigned int
141 c_family_lang_mask
= (CL_C
| CL_CXX
| CL_ObjC
| CL_ObjCXX
);
143 /* Defer option CODE with argument ARG. */
145 defer_opt (enum opt_code code
, const char *arg
)
147 deferred_opts
[deferred_count
].code
= code
;
148 deferred_opts
[deferred_count
].arg
= arg
;
152 /* Return language mask for option parsing. */
154 c_common_option_lang_mask (void)
156 static const unsigned int lang_flags
[] = {CL_C
, CL_ObjC
, CL_CXX
, CL_ObjCXX
};
158 return lang_flags
[c_language
];
161 /* Diagnostic finalizer for C/C++/Objective-C/Objective-C++. */
163 c_diagnostic_finalizer (diagnostic_context
*context
,
164 diagnostic_info
*diagnostic
)
166 diagnostic_show_locus (context
, diagnostic
->richloc
, diagnostic
->kind
);
167 /* By default print macro expansion contexts in the diagnostic
168 finalizer -- for tokens resulting from macro expansion. */
169 virt_loc_aware_diagnostic_finalizer (context
, diagnostic
);
170 pp_destroy_prefix (context
->printer
);
171 pp_flush (context
->printer
);
174 /* Common default settings for diagnostics. */
176 c_common_diagnostics_set_defaults (diagnostic_context
*context
)
178 diagnostic_finalizer (context
) = c_diagnostic_finalizer
;
179 context
->opt_permissive
= OPT_fpermissive
;
182 /* Whether options from all C-family languages should be accepted
184 static bool accept_all_c_family_options
= false;
186 /* Return whether to complain about a wrong-language option. */
188 c_common_complain_wrong_lang_p (const struct cl_option
*option
)
190 if (accept_all_c_family_options
191 && (option
->flags
& c_family_lang_mask
))
197 /* Initialize options structure OPTS. */
199 c_common_init_options_struct (struct gcc_options
*opts
)
201 opts
->x_flag_exceptions
= c_dialect_cxx ();
202 opts
->x_warn_pointer_arith
= c_dialect_cxx ();
203 opts
->x_warn_write_strings
= c_dialect_cxx ();
204 opts
->x_flag_warn_unused_result
= true;
206 /* By default, C99-like requirements for complex multiply and divide. */
207 opts
->x_flag_complex_method
= 2;
210 /* Common initialization before calling option handlers. */
212 c_common_init_options (unsigned int decoded_options_count
,
213 struct cl_decoded_option
*decoded_options
)
216 struct cpp_callbacks
*cb
;
219 = new (ggc_alloc
<string_concat_db
> ()) string_concat_db ();
221 parse_in
= cpp_create_reader (c_dialect_cxx () ? CLK_GNUCXX
: CLK_GNUC89
,
222 ident_hash
, line_table
);
223 cb
= cpp_get_callbacks (parse_in
);
224 cb
->error
= c_cpp_error
;
226 cpp_opts
= cpp_get_options (parse_in
);
227 cpp_opts
->dollars_in_ident
= DOLLARS_IN_IDENTIFIERS
;
228 cpp_opts
->objc
= c_dialect_objc ();
230 /* Reset to avoid warnings on internal definitions. We set it just
231 before passing on command-line options to cpplib. */
232 cpp_opts
->warn_dollars
= 0;
234 deferred_opts
= XNEWVEC (struct deferred_opt
, decoded_options_count
);
236 if (c_language
== clk_c
)
238 /* The default for C is gnu11. */
239 set_std_c11 (false /* ISO */);
241 /* If preprocessing assembly language, accept any of the C-family
242 front end options since the driver may pass them through. */
243 for (i
= 1; i
< decoded_options_count
; i
++)
244 if (decoded_options
[i
].opt_index
== OPT_lang_asm
)
246 accept_all_c_family_options
= true;
251 /* Set C++ standard to C++14 if not specified on the command line. */
252 if (c_dialect_cxx ())
253 set_std_cxx14 (/*ISO*/false);
255 global_dc
->colorize_source_p
= true;
258 /* Handle switch SCODE with argument ARG. VALUE is true, unless no-
259 form of an -f or -W option was given. Returns false if the switch was
260 invalid, true if valid. Use HANDLERS in recursive handle_option calls. */
262 c_common_handle_option (size_t scode
, const char *arg
, int value
,
263 int kind
, location_t loc
,
264 const struct cl_option_handlers
*handlers
)
266 const struct cl_option
*option
= &cl_options
[scode
];
267 enum opt_code code
= (enum opt_code
) scode
;
270 /* Prevent resetting the language standard to a C dialect when the driver
271 has already determined that we're looking at assembler input. */
272 bool preprocessing_asm_p
= (cpp_get_options (parse_in
)->lang
== CLK_ASM
);
277 if (cl_options
[code
].flags
& c_family_lang_mask
)
279 if ((option
->flags
& CL_TARGET
)
280 && ! targetcm
.handle_c_option (scode
, arg
, value
))
287 case OPT__output_pch_
:
292 defer_opt (code
, arg
);
296 cpp_opts
->discard_comments
= 0;
300 cpp_opts
->discard_comments
= 0;
301 cpp_opts
->discard_comments_in_macro_exp
= 0;
305 defer_opt (code
, arg
);
309 cpp_opts
->print_include_names
= 1;
313 TARGET_OPTF (xstrdup (arg
));
317 if (strcmp (arg
, "-"))
318 add_path (xstrdup (arg
), BRACKET
, 0, true);
321 if (quote_chain_split
)
322 error ("-I- specified twice");
323 quote_chain_split
= true;
324 split_quote_chain ();
325 inform (input_location
, "obsolete option -I- used, please use -iquote instead");
331 /* When doing dependencies with -M or -MM, suppress normal
332 preprocessed output, but still do -dM etc. as software
333 depends on this. Preprocessed output does occur if -MD, -MMD
334 or environment var dependency generation is used. */
335 cpp_opts
->deps
.style
= (code
== OPT_M
? DEPS_SYSTEM
: DEPS_USER
);
341 cpp_opts
->deps
.style
= (code
== OPT_MD
? DEPS_SYSTEM
: DEPS_USER
);
342 cpp_opts
->deps
.need_preprocessor_output
= true;
353 cpp_opts
->deps
.missing_files
= true;
358 cpp_opts
->deps
.phony_targets
= true;
364 defer_opt (code
, arg
);
368 flag_no_line_commands
= 1;
372 defer_opt (code
, arg
);
376 /* ??? Don't add new options here. Use LangEnabledBy in c.opt. */
378 cpp_opts
->warn_num_sign_change
= value
;
381 case OPT_Walloca_larger_than_
:
383 inform (loc
, "-Walloca-larger-than=0 is meaningless");
386 case OPT_Wvla_larger_than_
:
388 inform (loc
, "-Wvla-larger-than=0 is meaningless");
391 case OPT_Wunknown_pragmas
:
392 /* Set to greater than 1, so that even unknown pragmas in
393 system headers will be warned about. */
394 /* ??? There is no way to handle this automatically for now. */
395 warn_unknown_pragmas
= value
* 2;
399 if (!c_dialect_cxx ())
400 set_std_c89 (false, true);
402 set_std_cxx98 (true);
413 warning (0, "%<-Wabi=1%> is not supported, using =2");
416 warn_abi_version
= value
;
417 if (flag_abi_compat_version
== -1)
418 flag_abi_compat_version
= value
;
421 case OPT_fcanonical_system_headers
:
422 cpp_opts
->canonical_system_headers
= value
;
425 case OPT_fcond_mismatch
:
426 if (!c_dialect_cxx ())
428 flag_cond_mismatch
= value
;
431 warning (0, "switch %qs is no longer supported", option
->opt_text
);
438 disable_builtin_function (arg
);
441 case OPT_fdirectives_only
:
442 cpp_opts
->directives_only
= value
;
445 case OPT_fdollars_in_identifiers
:
446 cpp_opts
->dollars_in_ident
= value
;
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_foperator_names
:
466 cpp_opts
->operator_names
= value
;
470 cpp_opts
->restore_pch_deps
= value
;
473 case OPT_fpch_preprocess
:
474 flag_pch_preprocess
= value
;
477 case OPT_fpermissive
:
478 flag_permissive
= value
;
479 global_dc
->permissive
= value
;
482 case OPT_fpreprocessed
:
483 cpp_opts
->preprocessed
= value
;
490 case OPT_ftrack_macro_expansion
:
495 case OPT_ftrack_macro_expansion_
:
496 if (arg
&& *arg
!= '\0')
497 cpp_opts
->track_macro_expansion
= value
;
499 cpp_opts
->track_macro_expansion
= 2;
503 flag_use_repository
= value
;
505 flag_implicit_templates
= 0;
509 /* It is documented that we silently ignore silly values. */
510 if (value
>= 1 && value
<= 100)
511 cpp_opts
->tabstop
= value
;
514 case OPT_fexec_charset_
:
515 cpp_opts
->narrow_charset
= arg
;
518 case OPT_fwide_exec_charset_
:
519 cpp_opts
->wide_charset
= arg
;
522 case OPT_finput_charset_
:
523 cpp_opts
->input_charset
= arg
;
526 case OPT_ftemplate_depth_
:
527 max_tinst_depth
= value
;
530 case OPT_fvisibility_inlines_hidden
:
531 visibility_options
.inlines_hidden
= value
;
534 case OPT_femit_struct_debug_baseonly
:
535 set_struct_debug_option (&global_options
, loc
, "base");
538 case OPT_femit_struct_debug_reduced
:
539 set_struct_debug_option (&global_options
, loc
,
540 "dir:ord:sys,dir:gen:any,ind:base");
543 case OPT_femit_struct_debug_detailed_
:
544 set_struct_debug_option (&global_options
, loc
, arg
);
547 case OPT_fext_numeric_literals
:
548 cpp_opts
->ext_numeric_literals
= value
;
552 add_path (xstrdup (arg
), AFTER
, 0, true);
557 defer_opt (code
, arg
);
569 add_path (xstrdup (arg
), QUOTE
, 0, true);
577 add_path (xstrdup (arg
), SYSTEM
, 0, true);
580 case OPT_iwithprefix
:
581 add_prefixed_path (arg
, SYSTEM
);
584 case OPT_iwithprefixbefore
:
585 add_prefixed_path (arg
, BRACKET
);
589 cpp_set_lang (parse_in
, CLK_ASM
);
590 cpp_opts
->dollars_in_ident
= false;
605 error ("output filename specified twice");
608 case OPT_print_objc_runtime_info
:
609 print_struct_values
= 1;
617 case OPT_std_gnu__98
:
618 if (!preprocessing_asm_p
)
619 set_std_cxx98 (code
== OPT_std_c__98
/* ISO */);
623 case OPT_std_gnu__11
:
624 if (!preprocessing_asm_p
)
625 set_std_cxx11 (code
== OPT_std_c__11
/* ISO */);
629 case OPT_std_gnu__14
:
630 if (!preprocessing_asm_p
)
631 set_std_cxx14 (code
== OPT_std_c__14
/* ISO */);
635 case OPT_std_gnu__1z
:
636 if (!preprocessing_asm_p
)
637 set_std_cxx1z (code
== OPT_std_c__1z
/* ISO */);
641 case OPT_std_iso9899_199409
:
642 if (!preprocessing_asm_p
)
643 set_std_c89 (code
== OPT_std_iso9899_199409
/* c94 */, true /* ISO */);
647 if (!preprocessing_asm_p
)
648 set_std_c89 (false /* c94 */, false /* ISO */);
652 if (!preprocessing_asm_p
)
653 set_std_c99 (true /* ISO */);
657 if (!preprocessing_asm_p
)
658 set_std_c99 (false /* ISO */);
662 if (!preprocessing_asm_p
)
663 set_std_c11 (true /* ISO */);
667 if (!preprocessing_asm_p
)
668 set_std_c11 (false /* ISO */);
672 cpp_opts
->trigraphs
= 1;
675 case OPT_traditional_cpp
:
676 cpp_opts
->traditional
= 1;
687 C_handle_option_auto (&global_options
, &global_options_set
,
689 c_family_lang_mask
, kind
,
690 loc
, handlers
, global_dc
);
694 ObjC_handle_option_auto (&global_options
, &global_options_set
,
696 c_family_lang_mask
, kind
,
697 loc
, handlers
, global_dc
);
701 CXX_handle_option_auto (&global_options
, &global_options_set
,
703 c_family_lang_mask
, kind
,
704 loc
, handlers
, global_dc
);
708 ObjCXX_handle_option_auto (&global_options
, &global_options_set
,
710 c_family_lang_mask
, kind
,
711 loc
, handlers
, global_dc
);
718 cpp_handle_option_auto (&global_options
, scode
, cpp_opts
);
722 /* Default implementation of TARGET_HANDLE_C_OPTION. */
725 default_handle_c_option (size_t code ATTRIBUTE_UNUSED
,
726 const char *arg ATTRIBUTE_UNUSED
,
727 int value ATTRIBUTE_UNUSED
)
732 /* Post-switch processing. */
734 c_common_post_options (const char **pfilename
)
736 struct cpp_callbacks
*cb
;
738 /* Canonicalize the input and output filenames. */
739 if (in_fnames
== NULL
)
741 in_fnames
= XNEWVEC (const char *, 1);
744 else if (strcmp (in_fnames
[0], "-") == 0)
747 error ("cannot use %<-%> as input filename for a precompiled header");
752 if (out_fname
== NULL
|| !strcmp (out_fname
, "-"))
755 if (cpp_opts
->deps
.style
== DEPS_NONE
)
756 check_deps_environment_vars ();
758 handle_deferred_opts ();
760 sanitize_cpp_opts ();
762 register_include_chains (parse_in
, sysroot
, iprefix
, imultilib
,
763 std_inc
, std_cxx_inc
&& c_dialect_cxx (), verbose
);
765 #ifdef C_COMMON_OVERRIDE_OPTIONS
766 /* Some machines may reject certain combinations of C
767 language-specific options. */
768 C_COMMON_OVERRIDE_OPTIONS
;
771 /* Excess precision other than "fast" requires front-end
773 if (c_dialect_cxx ())
775 if (flag_excess_precision_cmdline
== EXCESS_PRECISION_STANDARD
)
776 sorry ("-fexcess-precision=standard for C++");
777 flag_excess_precision_cmdline
= EXCESS_PRECISION_FAST
;
779 else if (flag_excess_precision_cmdline
== EXCESS_PRECISION_DEFAULT
)
780 flag_excess_precision_cmdline
= (flag_iso
781 ? EXCESS_PRECISION_STANDARD
782 : EXCESS_PRECISION_FAST
);
784 /* ISO C restricts floating-point expression contraction to within
785 source-language expressions (-ffp-contract=on, currently an alias
786 for -ffp-contract=off). */
789 && (global_options_set
.x_flag_fp_contract_mode
790 == (enum fp_contract_mode
) 0)
791 && flag_unsafe_math_optimizations
== 0)
792 flag_fp_contract_mode
= FP_CONTRACT_OFF
;
794 /* If we are compiling C, and we are outside of a standards mode,
795 we can permit the new values from ISO/IEC TS 18661-3 for
796 FLT_EVAL_METHOD. Otherwise, we must restrict the possible values to
797 the set specified in ISO C99/C11. */
800 && (global_options_set
.x_flag_permitted_flt_eval_methods
801 == PERMITTED_FLT_EVAL_METHODS_DEFAULT
))
802 flag_permitted_flt_eval_methods
= PERMITTED_FLT_EVAL_METHODS_TS_18661
;
804 flag_permitted_flt_eval_methods
= PERMITTED_FLT_EVAL_METHODS_C11
;
806 /* By default we use C99 inline semantics in GNU99 or C99 mode. C99
807 inline semantics are not supported in GNU89 or C89 mode. */
808 if (flag_gnu89_inline
== -1)
809 flag_gnu89_inline
= !flag_isoc99
;
810 else if (!flag_gnu89_inline
&& !flag_isoc99
)
811 error ("-fno-gnu89-inline is only supported in GNU99 or C99 mode");
813 /* Default to ObjC sjlj exception handling if NeXT runtime. */
814 if (flag_objc_sjlj_exceptions
< 0)
815 flag_objc_sjlj_exceptions
= flag_next_runtime
;
816 if (flag_objc_exceptions
&& !flag_objc_sjlj_exceptions
)
819 /* If -ffreestanding, -fno-hosted or -fno-builtin then disable
820 pattern recognition. */
821 if (!global_options_set
.x_flag_tree_loop_distribute_patterns
823 flag_tree_loop_distribute_patterns
= 0;
825 /* -Woverlength-strings is off by default, but is enabled by -Wpedantic.
826 It is never enabled in C++, as the minimum limit is not normative
828 if (c_dialect_cxx ())
829 warn_overlength_strings
= 0;
831 /* Wmain is enabled by default in C++ but not in C. */
832 /* Wmain is disabled by default for -ffreestanding (!flag_hosted),
833 even if -Wall or -Wpedantic was given (warn_main will be 2 if set
834 by -Wall, 1 if set by -Wmain). */
836 warn_main
= (c_dialect_cxx () && flag_hosted
) ? 1 : 0;
837 else if (warn_main
== 2)
838 warn_main
= flag_hosted
? 1 : 0;
840 /* In C, -Wall and -Wc++-compat enable -Wenum-compare; if it has not
841 yet been set, it is disabled by default. In C++, it is enabled
843 if (warn_enum_compare
== -1)
844 warn_enum_compare
= c_dialect_cxx () ? 1 : 0;
846 /* -Wpacked-bitfield-compat is on by default for the C languages. The
847 warning is issued in stor-layout.c which is not part of the front-end so
848 we need to selectively turn it on here. */
849 if (warn_packed_bitfield_compat
== -1)
850 warn_packed_bitfield_compat
= 1;
852 /* Special format checking options don't work without -Wformat; warn if
856 warning (OPT_Wformat_y2k
,
857 "-Wformat-y2k ignored without -Wformat");
858 warning (OPT_Wformat_extra_args
,
859 "-Wformat-extra-args ignored without -Wformat");
860 warning (OPT_Wformat_zero_length
,
861 "-Wformat-zero-length ignored without -Wformat");
862 warning (OPT_Wformat_nonliteral
,
863 "-Wformat-nonliteral ignored without -Wformat");
864 warning (OPT_Wformat_contains_nul
,
865 "-Wformat-contains-nul ignored without -Wformat");
866 warning (OPT_Wformat_security
,
867 "-Wformat-security ignored without -Wformat");
870 /* -Wimplicit-function-declaration is enabled by default for C99. */
871 if (warn_implicit_function_declaration
== -1)
872 warn_implicit_function_declaration
= flag_isoc99
;
874 /* -Wimplicit-int is enabled by default for C99. */
875 if (warn_implicit_int
== -1)
876 warn_implicit_int
= flag_isoc99
;
878 /* -Wshift-overflow is enabled by default in C99 and C++11 modes. */
879 if (warn_shift_overflow
== -1)
880 warn_shift_overflow
= cxx_dialect
>= cxx11
|| flag_isoc99
;
882 /* -Wshift-negative-value is enabled by -Wextra in C99 and C++11 modes. */
883 if (warn_shift_negative_value
== -1)
884 warn_shift_negative_value
= (extra_warnings
885 && (cxx_dialect
>= cxx11
|| flag_isoc99
));
887 /* -Wregister is enabled by default in C++17. */
888 if (!global_options_set
.x_warn_register
)
889 warn_register
= cxx_dialect
>= cxx1z
;
891 /* Declone C++ 'structors if -Os. */
892 if (flag_declone_ctor_dtor
== -1)
893 flag_declone_ctor_dtor
= optimize_size
;
895 if (warn_abi_version
== -1)
897 if (flag_abi_compat_version
!= -1)
898 warn_abi_version
= flag_abi_compat_version
;
900 warn_abi_version
= 0;
903 if (flag_abi_compat_version
== 1)
905 warning (0, "%<-fabi-compat-version=1%> is not supported, using =2");
906 flag_abi_compat_version
= 2;
908 else if (flag_abi_compat_version
== -1)
910 /* Generate compatibility aliases for ABI v11 (7.1) by default. */
911 flag_abi_compat_version
912 = (flag_abi_version
== 0 ? 11 : 0);
915 /* Change flag_abi_version to be the actual current ABI level for the
916 benefit of c_cpp_builtins. */
917 if (flag_abi_version
== 0)
918 flag_abi_version
= 12;
920 /* By default, enable the new inheriting constructor semantics along with ABI
921 11. New and old should coexist fine, but it is a change in what
922 artificial symbols are generated. */
923 if (!global_options_set
.x_flag_new_inheriting_ctors
)
924 flag_new_inheriting_ctors
= abi_version_at_least (11);
926 /* For GCC 7, only enable DR150 resolution by default if -std=c++1z. */
927 if (!global_options_set
.x_flag_new_ttp
)
928 flag_new_ttp
= (cxx_dialect
>= cxx1z
);
930 if (cxx_dialect
>= cxx11
)
932 /* If we're allowing C++0x constructs, don't warn about C++98
933 identifiers which are keywords in C++0x. */
934 warn_cxx11_compat
= 0;
935 cpp_opts
->cpp_warn_cxx11_compat
= 0;
937 if (warn_narrowing
== -1)
940 /* Unless -f{,no-}ext-numeric-literals has been used explicitly,
941 for -std=c++{11,14,1z} default to -fno-ext-numeric-literals. */
942 if (flag_iso
&& !global_options_set
.x_flag_ext_numeric_literals
)
943 cpp_opts
->ext_numeric_literals
= 0;
945 else if (warn_narrowing
== -1)
948 /* C++17 has stricter evaluation order requirements; let's use some of them
949 for earlier C++ as well, so chaining works as expected. */
951 && flag_strong_eval_order
== -1)
952 flag_strong_eval_order
= (cxx_dialect
>= cxx1z
? 2 : 1);
954 /* Global sized deallocation is new in C++14. */
955 if (flag_sized_deallocation
== -1)
956 flag_sized_deallocation
= (cxx_dialect
>= cxx14
);
958 if (flag_extern_tls_init
)
960 #if !defined (ASM_OUTPUT_DEF) || !SUPPORTS_WEAK
961 /* Lazy TLS initialization for a variable in another TU requires
962 alias and weak reference support. */
963 if (flag_extern_tls_init
> 0)
964 sorry ("external TLS initialization functions not supported "
966 flag_extern_tls_init
= 0;
968 flag_extern_tls_init
= 1;
972 if (num_in_fnames
> 1)
973 error ("too many filenames given. Type %s --help for usage",
976 if (flag_preprocess_only
)
978 /* Open the output now. We must do so even if flag_no_output is
979 on, because there may be other output than from the actual
980 preprocessing (e.g. from -dM). */
981 if (out_fname
[0] == '\0')
984 out_stream
= fopen (out_fname
, "w");
986 if (out_stream
== NULL
)
988 fatal_error (input_location
, "opening output file %s: %m", out_fname
);
992 init_pp_output (out_stream
);
998 /* When writing a PCH file, avoid reading some other PCH file,
999 because the default address space slot then can't be used
1000 for the output PCH file. */
1003 c_common_no_more_pch ();
1004 /* Only -g0 and -gdwarf* are supported with PCH, for other
1005 debug formats we warn here and refuse to load any PCH files. */
1006 if (write_symbols
!= NO_DEBUG
&& write_symbols
!= DWARF2_DEBUG
)
1007 warning (OPT_Wdeprecated
,
1008 "the \"%s\" debug format cannot be used with "
1009 "pre-compiled headers", debug_type_names
[write_symbols
]);
1011 else if (write_symbols
!= NO_DEBUG
&& write_symbols
!= DWARF2_DEBUG
)
1012 c_common_no_more_pch ();
1014 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1015 input_location
= UNKNOWN_LOCATION
;
1018 cb
= cpp_get_callbacks (parse_in
);
1019 cb
->file_change
= cb_file_change
;
1020 cb
->dir_change
= cb_dir_change
;
1021 cpp_post_options (parse_in
);
1022 init_global_opts_from_cpp (&global_options
, cpp_get_options (parse_in
));
1024 input_location
= UNKNOWN_LOCATION
;
1026 *pfilename
= this_input_filename
1027 = cpp_read_main_file (parse_in
, in_fnames
[0]);
1028 /* Don't do any compilation or preprocessing if there is no input file. */
1029 if (this_input_filename
== NULL
)
1035 if (flag_working_directory
1036 && flag_preprocess_only
&& !flag_no_line_commands
)
1037 pp_dir_change (parse_in
, get_src_pwd ());
1039 /* Disable LTO output when outputting a precompiled header. */
1040 if (pch_file
&& flag_lto
)
1043 flag_generate_lto
= 0;
1046 return flag_preprocess_only
;
1049 /* Front end initialization common to C, ObjC and C++. */
1051 c_common_init (void)
1053 /* Set up preprocessor arithmetic. Must be done after call to
1054 c_common_nodes_and_builtins for type nodes to be good. */
1055 cpp_opts
->precision
= TYPE_PRECISION (intmax_type_node
);
1056 cpp_opts
->char_precision
= TYPE_PRECISION (char_type_node
);
1057 cpp_opts
->int_precision
= TYPE_PRECISION (integer_type_node
);
1058 cpp_opts
->wchar_precision
= TYPE_PRECISION (wchar_type_node
);
1059 cpp_opts
->unsigned_wchar
= TYPE_UNSIGNED (wchar_type_node
);
1060 cpp_opts
->bytes_big_endian
= BYTES_BIG_ENDIAN
;
1062 /* This can't happen until after wchar_precision and bytes_big_endian
1064 cpp_init_iconv (parse_in
);
1069 fputs ("Compiler executable checksum: ", stderr
);
1070 for (i
= 0; i
< 16; i
++)
1071 fprintf (stderr
, "%02x", executable_checksum
[i
]);
1072 putc ('\n', stderr
);
1075 /* Has to wait until now so that cpplib has its hash table. */
1078 if (flag_preprocess_only
)
1080 c_finish_options ();
1081 preprocess_file (parse_in
);
1088 /* Initialize the integrated preprocessor after debug output has been
1089 initialized; loop over each input file. */
1091 c_common_parse_file (void)
1098 c_finish_options ();
1099 /* Open the dump file to use for the original dump output
1100 here, to be used during parsing for the current file. */
1101 original_dump_file
= dump_begin (TDI_original
, &original_dump_flags
);
1106 /* And end the main input file, if the debug writer wants it */
1107 if (debug_hooks
->start_end_main_source_file
)
1108 (*debug_hooks
->end_source_file
) (0);
1109 if (++i
>= num_in_fnames
)
1111 cpp_undef_all (parse_in
);
1112 cpp_clear_file_cache (parse_in
);
1114 = cpp_read_main_file (parse_in
, in_fnames
[i
]);
1115 if (original_dump_file
)
1117 dump_end (TDI_original
, original_dump_file
);
1118 original_dump_file
= NULL
;
1120 /* If an input file is missing, abandon further compilation.
1121 cpplib has issued a diagnostic. */
1122 if (!this_input_filename
)
1126 c_parse_final_cleanups ();
1129 /* Returns the appropriate dump file for PHASE to dump with FLAGS. */
1132 get_dump_info (int phase
, dump_flags_t
*flags
)
1134 gcc_assert (phase
== TDI_original
);
1136 *flags
= original_dump_flags
;
1137 return original_dump_file
;
1140 /* Common finish hook for the C, ObjC and C++ front ends. */
1142 c_common_finish (void)
1144 FILE *deps_stream
= NULL
;
1146 /* Don't write the deps file if there are errors. */
1147 if (cpp_opts
->deps
.style
!= DEPS_NONE
&& !seen_error ())
1149 /* If -M or -MM was seen without -MF, default output to the
1152 deps_stream
= out_stream
;
1155 deps_stream
= fopen (deps_file
, deps_append
? "a": "w");
1157 fatal_error (input_location
, "opening dependency file %s: %m",
1162 /* For performance, avoid tearing down cpplib's internal structures
1163 with cpp_destroy (). */
1164 cpp_finish (parse_in
, deps_stream
);
1166 if (deps_stream
&& deps_stream
!= out_stream
1167 && (ferror (deps_stream
) || fclose (deps_stream
)))
1168 fatal_error (input_location
, "closing dependency file %s: %m", deps_file
);
1170 if (out_stream
&& (ferror (out_stream
) || fclose (out_stream
)))
1171 fatal_error (input_location
, "when writing output to %s: %m", out_fname
);
1174 /* Either of two environment variables can specify output of
1175 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1176 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1177 and DEPS_TARGET is the target to mention in the deps. They also
1178 result in dependency information being appended to the output file
1179 rather than overwriting it, and like Sun's compiler
1180 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1182 check_deps_environment_vars (void)
1186 spec
= getenv ("DEPENDENCIES_OUTPUT");
1188 cpp_opts
->deps
.style
= DEPS_USER
;
1191 spec
= getenv ("SUNPRO_DEPENDENCIES");
1194 cpp_opts
->deps
.style
= DEPS_SYSTEM
;
1195 cpp_opts
->deps
.ignore_main_file
= true;
1201 /* Find the space before the DEPS_TARGET, if there is one. */
1202 char *s
= strchr (spec
, ' ');
1205 /* Let the caller perform MAKE quoting. */
1206 defer_opt (OPT_MT
, s
+ 1);
1210 /* Command line -MF overrides environment variables and default. */
1219 /* Handle deferred command line switches. */
1221 handle_deferred_opts (void)
1226 /* Avoid allocating the deps buffer if we don't need it.
1227 (This flag may be true without there having been -MT or -MQ
1228 options, but we'll still need the deps buffer.) */
1232 deps
= cpp_get_deps (parse_in
);
1234 for (i
= 0; i
< deferred_count
; i
++)
1236 struct deferred_opt
*opt
= &deferred_opts
[i
];
1238 if (opt
->code
== OPT_MT
|| opt
->code
== OPT_MQ
)
1239 deps_add_target (deps
, opt
->arg
, opt
->code
== OPT_MQ
);
1243 /* These settings are appropriate for GCC, but not necessarily so for
1244 cpplib as a library. */
1246 sanitize_cpp_opts (void)
1248 /* If we don't know what style of dependencies to output, complain
1249 if any other dependency switches have been given. */
1250 if (deps_seen
&& cpp_opts
->deps
.style
== DEPS_NONE
)
1251 error ("to generate dependencies you must specify either -M or -MM");
1253 /* -dM and dependencies suppress normal output; do it here so that
1254 the last -d[MDN] switch overrides earlier ones. */
1255 if (flag_dump_macros
== 'M')
1258 /* By default, -fdirectives-only implies -dD. This allows subsequent phases
1259 to perform proper macro expansion. */
1260 if (cpp_opts
->directives_only
&& !cpp_opts
->preprocessed
&& !flag_dump_macros
)
1261 flag_dump_macros
= 'D';
1263 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1264 -dM since at least glibc relies on -M -dM to work. */
1265 /* Also, flag_no_output implies flag_no_line_commands, always. */
1268 if (flag_dump_macros
!= 'M')
1269 flag_dump_macros
= 0;
1270 flag_dump_includes
= 0;
1271 flag_no_line_commands
= 1;
1273 else if (cpp_opts
->deps
.missing_files
)
1274 error ("-MG may only be used with -M or -MM");
1276 cpp_opts
->unsigned_char
= !flag_signed_char
;
1277 cpp_opts
->stdc_0_in_system_headers
= STDC_0_IN_SYSTEM_HEADERS
;
1279 /* Wlong-long is disabled by default. It is enabled by:
1280 [-Wpedantic | -Wtraditional] -std=[gnu|c]++98 ; or
1281 [-Wpedantic | -Wtraditional] -std=non-c99
1283 Either -Wlong-long or -Wno-long-long override any other settings.
1284 ??? These conditions should be handled in c.opt. */
1285 if (warn_long_long
== -1)
1287 warn_long_long
= ((pedantic
|| warn_traditional
)
1288 && (c_dialect_cxx () ? cxx_dialect
== cxx98
: !flag_isoc99
));
1289 cpp_opts
->cpp_warn_long_long
= warn_long_long
;
1292 /* If we're generating preprocessor output, emit current directory
1293 if explicitly requested or if debugging information is enabled.
1294 ??? Maybe we should only do it for debugging formats that
1295 actually output the current directory? */
1296 if (flag_working_directory
== -1)
1297 flag_working_directory
= (debug_info_level
!= DINFO_LEVEL_NONE
);
1299 if (warn_implicit_fallthrough
< 5)
1300 cpp_opts
->cpp_warn_implicit_fallthrough
= warn_implicit_fallthrough
;
1302 cpp_opts
->cpp_warn_implicit_fallthrough
= 0;
1304 if (cpp_opts
->directives_only
)
1306 if (cpp_warn_unused_macros
)
1307 error ("-fdirectives-only is incompatible with -Wunused_macros");
1308 if (cpp_opts
->traditional
)
1309 error ("-fdirectives-only is incompatible with -traditional");
1313 /* Add include path with a prefix at the front of its name. */
1315 add_prefixed_path (const char *suffix
, size_t chain
)
1319 size_t prefix_len
, suffix_len
;
1321 suffix_len
= strlen (suffix
);
1322 prefix
= iprefix
? iprefix
: cpp_GCC_INCLUDE_DIR
;
1323 prefix_len
= iprefix
? strlen (iprefix
) : cpp_GCC_INCLUDE_DIR_len
;
1325 path
= (char *) xmalloc (prefix_len
+ suffix_len
+ 1);
1326 memcpy (path
, prefix
, prefix_len
);
1327 memcpy (path
+ prefix_len
, suffix
, suffix_len
);
1328 path
[prefix_len
+ suffix_len
] = '\0';
1330 add_path (path
, chain
, 0, false);
1333 /* Handle -D, -U, -A, -imacros, and the first -include. */
1335 c_finish_options (void)
1337 if (!cpp_opts
->preprocessed
)
1341 cb_file_change (parse_in
,
1342 linemap_check_ordinary (linemap_add (line_table
,
1346 /* Make sure all of the builtins about to be declared have
1347 BUILTINS_LOCATION has their source_location. */
1348 source_location builtins_loc
= BUILTINS_LOCATION
;
1349 cpp_force_token_locations (parse_in
, &builtins_loc
);
1351 cpp_init_builtins (parse_in
, flag_hosted
);
1352 c_cpp_builtins (parse_in
);
1354 cpp_stop_forcing_token_locations (parse_in
);
1356 /* We're about to send user input to cpplib, so make it warn for
1357 things that we previously (when we sent it internal definitions)
1358 told it to not warn.
1360 C99 permits implementation-defined characters in identifiers.
1361 The documented meaning of -std= is to turn off extensions that
1362 conflict with the specified standard, and since a strictly
1363 conforming program cannot contain a '$', we do not condition
1364 their acceptance on the -std= setting. */
1365 cpp_opts
->warn_dollars
= (cpp_opts
->cpp_pedantic
&& !cpp_opts
->c99
);
1367 cb_file_change (parse_in
,
1368 linemap_check_ordinary (linemap_add (line_table
, LC_RENAME
, 0,
1369 _("<command-line>"), 0)));
1371 for (i
= 0; i
< deferred_count
; i
++)
1373 struct deferred_opt
*opt
= &deferred_opts
[i
];
1375 if (opt
->code
== OPT_D
)
1376 cpp_define (parse_in
, opt
->arg
);
1377 else if (opt
->code
== OPT_U
)
1378 cpp_undef (parse_in
, opt
->arg
);
1379 else if (opt
->code
== OPT_A
)
1381 if (opt
->arg
[0] == '-')
1382 cpp_unassert (parse_in
, opt
->arg
+ 1);
1384 cpp_assert (parse_in
, opt
->arg
);
1388 /* Start the main input file, if the debug writer wants it. */
1389 if (debug_hooks
->start_end_main_source_file
1390 && !flag_preprocess_only
)
1391 (*debug_hooks
->start_source_file
) (0, this_input_filename
);
1393 /* Handle -imacros after -D and -U. */
1394 for (i
= 0; i
< deferred_count
; i
++)
1396 struct deferred_opt
*opt
= &deferred_opts
[i
];
1398 if (opt
->code
== OPT_imacros
1399 && cpp_push_include (parse_in
, opt
->arg
))
1401 /* Disable push_command_line_include callback for now. */
1402 include_cursor
= deferred_count
+ 1;
1403 cpp_scan_nooutput (parse_in
);
1409 if (cpp_opts
->directives_only
)
1410 cpp_init_special_builtins (parse_in
);
1412 /* Start the main input file, if the debug writer wants it. */
1413 if (debug_hooks
->start_end_main_source_file
1414 && !flag_preprocess_only
)
1415 (*debug_hooks
->start_source_file
) (0, this_input_filename
);
1419 push_command_line_include ();
1422 /* Give CPP the next file given by -include, if any. */
1424 push_command_line_include (void)
1426 /* This can happen if disabled by -imacros for example.
1427 Punt so that we don't set "<command-line>" as the filename for
1429 if (include_cursor
> deferred_count
)
1432 if (!done_preinclude
)
1434 done_preinclude
= true;
1435 if (flag_hosted
&& std_inc
&& !cpp_opts
->preprocessed
)
1437 const char *preinc
= targetcm
.c_preinclude ();
1438 if (preinc
&& cpp_push_default_include (parse_in
, preinc
))
1443 pch_cpp_save_state ();
1445 while (include_cursor
< deferred_count
)
1447 struct deferred_opt
*opt
= &deferred_opts
[include_cursor
++];
1449 if (!cpp_opts
->preprocessed
&& opt
->code
== OPT_include
1450 && cpp_push_include (parse_in
, opt
->arg
))
1454 if (include_cursor
== deferred_count
)
1457 /* -Wunused-macros should only warn about macros defined hereafter. */
1458 cpp_opts
->warn_unused_macros
= cpp_warn_unused_macros
;
1459 /* Restore the line map from <command line>. */
1460 if (!cpp_opts
->preprocessed
)
1461 cpp_change_file (parse_in
, LC_RENAME
, this_input_filename
);
1463 /* Set this here so the client can change the option if it wishes,
1464 and after stacking the main file so we don't trace the main file. */
1465 line_table
->trace_includes
= cpp_opts
->print_include_names
;
1469 /* File change callback. Has to handle -include files. */
1471 cb_file_change (cpp_reader
* ARG_UNUSED (pfile
),
1472 const line_map_ordinary
*new_map
)
1474 if (flag_preprocess_only
)
1475 pp_file_change (new_map
);
1477 fe_file_change (new_map
);
1480 && (new_map
->reason
== LC_ENTER
|| new_map
->reason
== LC_RENAME
))
1482 /* Signal to plugins that a file is included. This could happen
1483 several times with the same file path, e.g. because of
1484 several '#include' or '#line' directives... */
1485 invoke_plugin_callbacks
1486 (PLUGIN_INCLUDE_FILE
,
1487 const_cast<char*> (ORDINARY_MAP_FILE_NAME (new_map
)));
1490 if (new_map
== 0 || (new_map
->reason
== LC_LEAVE
&& MAIN_FILE_P (new_map
)))
1492 pch_cpp_save_state ();
1493 push_command_line_include ();
1498 cb_dir_change (cpp_reader
* ARG_UNUSED (pfile
), const char *dir
)
1500 if (!set_src_pwd (dir
))
1501 warning (0, "too late for # directive to set debug directory");
1504 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1505 extensions if ISO). There is no concept of gnu94. */
1507 set_std_c89 (int c94
, int iso
)
1509 cpp_set_lang (parse_in
, c94
? CLK_STDC94
: iso
? CLK_STDC89
: CLK_GNUC89
);
1512 flag_no_gnu_keywords
= iso
;
1513 flag_no_nonansi_builtin
= iso
;
1517 lang_hooks
.name
= "GNU C89";
1520 /* Set the C 99 standard (without GNU extensions if ISO). */
1522 set_std_c99 (int iso
)
1524 cpp_set_lang (parse_in
, iso
? CLK_STDC99
: CLK_GNUC99
);
1526 flag_no_nonansi_builtin
= iso
;
1531 lang_hooks
.name
= "GNU C99";
1534 /* Set the C 11 standard (without GNU extensions if ISO). */
1536 set_std_c11 (int iso
)
1538 cpp_set_lang (parse_in
, iso
? CLK_STDC11
: CLK_GNUC11
);
1540 flag_no_nonansi_builtin
= iso
;
1545 lang_hooks
.name
= "GNU C11";
1548 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1550 set_std_cxx98 (int iso
)
1552 cpp_set_lang (parse_in
, iso
? CLK_CXX98
: CLK_GNUCXX
);
1553 flag_no_gnu_keywords
= iso
;
1554 flag_no_nonansi_builtin
= iso
;
1558 cxx_dialect
= cxx98
;
1559 lang_hooks
.name
= "GNU C++98";
1562 /* Set the C++ 2011 standard (without GNU extensions if ISO). */
1564 set_std_cxx11 (int iso
)
1566 cpp_set_lang (parse_in
, iso
? CLK_CXX11
: CLK_GNUCXX11
);
1567 flag_no_gnu_keywords
= iso
;
1568 flag_no_nonansi_builtin
= iso
;
1570 /* C++11 includes the C99 standard library. */
1573 cxx_dialect
= cxx11
;
1574 lang_hooks
.name
= "GNU C++11";
1577 /* Set the C++ 2014 draft standard (without GNU extensions if ISO). */
1579 set_std_cxx14 (int iso
)
1581 cpp_set_lang (parse_in
, iso
? CLK_CXX14
: CLK_GNUCXX14
);
1582 flag_no_gnu_keywords
= iso
;
1583 flag_no_nonansi_builtin
= iso
;
1585 /* C++11 includes the C99 standard library. */
1588 cxx_dialect
= cxx14
;
1589 lang_hooks
.name
= "GNU C++14";
1592 /* Set the C++ 201z draft standard (without GNU extensions if ISO). */
1594 set_std_cxx1z (int iso
)
1596 cpp_set_lang (parse_in
, iso
? CLK_CXX1Z
: CLK_GNUCXX1Z
);
1597 flag_no_gnu_keywords
= iso
;
1598 flag_no_nonansi_builtin
= iso
;
1600 /* C++11 includes the C99 standard library. */
1604 cxx_dialect
= cxx1z
;
1605 lang_hooks
.name
= "GNU C++14"; /* Pretend C++14 till standarization. */
1608 /* Args to -d specify what to dump. Silently ignore
1609 unrecognized options; they may be aimed at toplev.c. */
1611 handle_OPT_d (const char *arg
)
1615 while ((c
= *arg
++) != '\0')
1618 case 'M': /* Dump macros only. */
1619 case 'N': /* Dump names. */
1620 case 'D': /* Dump definitions. */
1621 case 'U': /* Dump used macros. */
1622 flag_dump_macros
= c
;
1626 flag_dump_includes
= 1;