1 /* C/ObjC/C++ command line option handling.
2 Copyright (C) 2002-2016 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_Wunknown_pragmas
:
384 /* Set to greater than 1, so that even unknown pragmas in
385 system headers will be warned about. */
386 /* ??? There is no way to handle this automatically for now. */
387 warn_unknown_pragmas
= value
* 2;
391 if (!c_dialect_cxx ())
392 set_std_c89 (false, true);
394 set_std_cxx98 (true);
405 warning (0, "%<-Wabi=1%> is not supported, using =2");
408 warn_abi_version
= value
;
409 if (flag_abi_compat_version
== -1)
410 flag_abi_compat_version
= value
;
413 case OPT_fcanonical_system_headers
:
414 cpp_opts
->canonical_system_headers
= value
;
417 case OPT_fcond_mismatch
:
418 if (!c_dialect_cxx ())
420 flag_cond_mismatch
= value
;
423 warning (0, "switch %qs is no longer supported", option
->opt_text
);
430 disable_builtin_function (arg
);
433 case OPT_fdirectives_only
:
434 cpp_opts
->directives_only
= value
;
437 case OPT_fdollars_in_identifiers
:
438 cpp_opts
->dollars_in_ident
= value
;
441 case OPT_ffreestanding
:
446 flag_no_builtin
= !value
;
449 case OPT_fconstant_string_class_
:
450 constant_string_class_name
= arg
;
453 case OPT_fextended_identifiers
:
454 cpp_opts
->extended_identifiers
= value
;
457 case OPT_foperator_names
:
458 cpp_opts
->operator_names
= value
;
462 cpp_opts
->restore_pch_deps
= value
;
465 case OPT_fpch_preprocess
:
466 flag_pch_preprocess
= value
;
469 case OPT_fpermissive
:
470 flag_permissive
= value
;
471 global_dc
->permissive
= value
;
474 case OPT_fpreprocessed
:
475 cpp_opts
->preprocessed
= value
;
482 case OPT_ftrack_macro_expansion
:
487 case OPT_ftrack_macro_expansion_
:
488 if (arg
&& *arg
!= '\0')
489 cpp_opts
->track_macro_expansion
= value
;
491 cpp_opts
->track_macro_expansion
= 2;
495 flag_use_repository
= value
;
497 flag_implicit_templates
= 0;
501 /* It is documented that we silently ignore silly values. */
502 if (value
>= 1 && value
<= 100)
503 cpp_opts
->tabstop
= value
;
506 case OPT_fexec_charset_
:
507 cpp_opts
->narrow_charset
= arg
;
510 case OPT_fwide_exec_charset_
:
511 cpp_opts
->wide_charset
= arg
;
514 case OPT_finput_charset_
:
515 cpp_opts
->input_charset
= arg
;
518 case OPT_ftemplate_depth_
:
519 max_tinst_depth
= value
;
522 case OPT_fvisibility_inlines_hidden
:
523 visibility_options
.inlines_hidden
= value
;
526 case OPT_femit_struct_debug_baseonly
:
527 set_struct_debug_option (&global_options
, loc
, "base");
530 case OPT_femit_struct_debug_reduced
:
531 set_struct_debug_option (&global_options
, loc
,
532 "dir:ord:sys,dir:gen:any,ind:base");
535 case OPT_femit_struct_debug_detailed_
:
536 set_struct_debug_option (&global_options
, loc
, arg
);
539 case OPT_fext_numeric_literals
:
540 cpp_opts
->ext_numeric_literals
= value
;
544 add_path (xstrdup (arg
), AFTER
, 0, true);
549 defer_opt (code
, arg
);
561 add_path (xstrdup (arg
), QUOTE
, 0, true);
569 add_path (xstrdup (arg
), SYSTEM
, 0, true);
572 case OPT_iwithprefix
:
573 add_prefixed_path (arg
, SYSTEM
);
576 case OPT_iwithprefixbefore
:
577 add_prefixed_path (arg
, BRACKET
);
581 cpp_set_lang (parse_in
, CLK_ASM
);
582 cpp_opts
->dollars_in_ident
= false;
597 error ("output filename specified twice");
600 case OPT_print_objc_runtime_info
:
601 print_struct_values
= 1;
609 case OPT_std_gnu__98
:
610 if (!preprocessing_asm_p
)
611 set_std_cxx98 (code
== OPT_std_c__98
/* ISO */);
615 case OPT_std_gnu__11
:
616 if (!preprocessing_asm_p
)
618 set_std_cxx11 (code
== OPT_std_c__11
/* ISO */);
619 if (code
== OPT_std_c__11
)
620 cpp_opts
->ext_numeric_literals
= 0;
625 case OPT_std_gnu__14
:
626 if (!preprocessing_asm_p
)
628 set_std_cxx14 (code
== OPT_std_c__14
/* ISO */);
629 if (code
== OPT_std_c__14
)
630 cpp_opts
->ext_numeric_literals
= 0;
635 case OPT_std_gnu__1z
:
636 if (!preprocessing_asm_p
)
638 set_std_cxx1z (code
== OPT_std_c__1z
/* ISO */);
639 if (code
== OPT_std_c__1z
)
640 cpp_opts
->ext_numeric_literals
= 0;
645 case OPT_std_iso9899_199409
:
646 if (!preprocessing_asm_p
)
647 set_std_c89 (code
== OPT_std_iso9899_199409
/* c94 */, true /* ISO */);
651 if (!preprocessing_asm_p
)
652 set_std_c89 (false /* c94 */, false /* ISO */);
656 if (!preprocessing_asm_p
)
657 set_std_c99 (true /* ISO */);
661 if (!preprocessing_asm_p
)
662 set_std_c99 (false /* ISO */);
666 if (!preprocessing_asm_p
)
667 set_std_c11 (true /* ISO */);
671 if (!preprocessing_asm_p
)
672 set_std_c11 (false /* ISO */);
676 cpp_opts
->trigraphs
= 1;
679 case OPT_traditional_cpp
:
680 cpp_opts
->traditional
= 1;
691 C_handle_option_auto (&global_options
, &global_options_set
,
693 c_family_lang_mask
, kind
,
694 loc
, handlers
, global_dc
);
698 ObjC_handle_option_auto (&global_options
, &global_options_set
,
700 c_family_lang_mask
, kind
,
701 loc
, handlers
, global_dc
);
705 CXX_handle_option_auto (&global_options
, &global_options_set
,
707 c_family_lang_mask
, kind
,
708 loc
, handlers
, global_dc
);
712 ObjCXX_handle_option_auto (&global_options
, &global_options_set
,
714 c_family_lang_mask
, kind
,
715 loc
, handlers
, global_dc
);
722 cpp_handle_option_auto (&global_options
, scode
, cpp_opts
);
726 /* Default implementation of TARGET_HANDLE_C_OPTION. */
729 default_handle_c_option (size_t code ATTRIBUTE_UNUSED
,
730 const char *arg ATTRIBUTE_UNUSED
,
731 int value ATTRIBUTE_UNUSED
)
736 /* Post-switch processing. */
738 c_common_post_options (const char **pfilename
)
740 struct cpp_callbacks
*cb
;
742 /* Canonicalize the input and output filenames. */
743 if (in_fnames
== NULL
)
745 in_fnames
= XNEWVEC (const char *, 1);
748 else if (strcmp (in_fnames
[0], "-") == 0)
751 if (out_fname
== NULL
|| !strcmp (out_fname
, "-"))
754 if (cpp_opts
->deps
.style
== DEPS_NONE
)
755 check_deps_environment_vars ();
757 handle_deferred_opts ();
759 sanitize_cpp_opts ();
761 register_include_chains (parse_in
, sysroot
, iprefix
, imultilib
,
762 std_inc
, std_cxx_inc
&& c_dialect_cxx (), verbose
);
764 #ifdef C_COMMON_OVERRIDE_OPTIONS
765 /* Some machines may reject certain combinations of C
766 language-specific options. */
767 C_COMMON_OVERRIDE_OPTIONS
;
770 /* Excess precision other than "fast" requires front-end
772 if (c_dialect_cxx ())
774 if (flag_excess_precision_cmdline
== EXCESS_PRECISION_STANDARD
)
775 sorry ("-fexcess-precision=standard for C++");
776 flag_excess_precision_cmdline
= EXCESS_PRECISION_FAST
;
778 else if (flag_excess_precision_cmdline
== EXCESS_PRECISION_DEFAULT
)
779 flag_excess_precision_cmdline
= (flag_iso
780 ? EXCESS_PRECISION_STANDARD
781 : EXCESS_PRECISION_FAST
);
783 /* ISO C restricts floating-point expression contraction to within
784 source-language expressions (-ffp-contract=on, currently an alias
785 for -ffp-contract=off). */
788 && (global_options_set
.x_flag_fp_contract_mode
789 == (enum fp_contract_mode
) 0)
790 && flag_unsafe_math_optimizations
== 0)
791 flag_fp_contract_mode
= FP_CONTRACT_OFF
;
793 /* By default we use C99 inline semantics in GNU99 or C99 mode. C99
794 inline semantics are not supported in GNU89 or C89 mode. */
795 if (flag_gnu89_inline
== -1)
796 flag_gnu89_inline
= !flag_isoc99
;
797 else if (!flag_gnu89_inline
&& !flag_isoc99
)
798 error ("-fno-gnu89-inline is only supported in GNU99 or C99 mode");
800 /* Default to ObjC sjlj exception handling if NeXT runtime. */
801 if (flag_objc_sjlj_exceptions
< 0)
802 flag_objc_sjlj_exceptions
= flag_next_runtime
;
803 if (flag_objc_exceptions
&& !flag_objc_sjlj_exceptions
)
806 /* If -ffreestanding, -fno-hosted or -fno-builtin then disable
807 pattern recognition. */
808 if (!global_options_set
.x_flag_tree_loop_distribute_patterns
810 flag_tree_loop_distribute_patterns
= 0;
812 /* -Woverlength-strings is off by default, but is enabled by -Wpedantic.
813 It is never enabled in C++, as the minimum limit is not normative
815 if (c_dialect_cxx ())
816 warn_overlength_strings
= 0;
818 /* Wmain is enabled by default in C++ but not in C. */
819 /* Wmain is disabled by default for -ffreestanding (!flag_hosted),
820 even if -Wall or -Wpedantic was given (warn_main will be 2 if set
821 by -Wall, 1 if set by -Wmain). */
823 warn_main
= (c_dialect_cxx () && flag_hosted
) ? 1 : 0;
824 else if (warn_main
== 2)
825 warn_main
= flag_hosted
? 1 : 0;
827 /* In C, -Wall and -Wc++-compat enable -Wenum-compare; if it has not
828 yet been set, it is disabled by default. In C++, it is enabled
830 if (warn_enum_compare
== -1)
831 warn_enum_compare
= c_dialect_cxx () ? 1 : 0;
833 /* -Wpacked-bitfield-compat is on by default for the C languages. The
834 warning is issued in stor-layout.c which is not part of the front-end so
835 we need to selectively turn it on here. */
836 if (warn_packed_bitfield_compat
== -1)
837 warn_packed_bitfield_compat
= 1;
839 /* Special format checking options don't work without -Wformat; warn if
843 warning (OPT_Wformat_y2k
,
844 "-Wformat-y2k ignored without -Wformat");
845 warning (OPT_Wformat_extra_args
,
846 "-Wformat-extra-args ignored without -Wformat");
847 warning (OPT_Wformat_zero_length
,
848 "-Wformat-zero-length ignored without -Wformat");
849 warning (OPT_Wformat_nonliteral
,
850 "-Wformat-nonliteral ignored without -Wformat");
851 warning (OPT_Wformat_contains_nul
,
852 "-Wformat-contains-nul ignored without -Wformat");
853 warning (OPT_Wformat_security
,
854 "-Wformat-security ignored without -Wformat");
857 /* -Wimplicit-function-declaration is enabled by default for C99. */
858 if (warn_implicit_function_declaration
== -1)
859 warn_implicit_function_declaration
= flag_isoc99
;
861 /* -Wimplicit-int is enabled by default for C99. */
862 if (warn_implicit_int
== -1)
863 warn_implicit_int
= flag_isoc99
;
865 /* -Wshift-overflow is enabled by default in C99 and C++11 modes. */
866 if (warn_shift_overflow
== -1)
867 warn_shift_overflow
= cxx_dialect
>= cxx11
|| flag_isoc99
;
869 /* -Wshift-negative-value is enabled by -Wextra in C99 and C++11 modes. */
870 if (warn_shift_negative_value
== -1)
871 warn_shift_negative_value
= (extra_warnings
872 && (cxx_dialect
>= cxx11
|| flag_isoc99
));
874 /* -Wregister is enabled by default in C++17. */
875 if (!global_options_set
.x_warn_register
)
876 warn_register
= cxx_dialect
>= cxx1z
;
878 /* Declone C++ 'structors if -Os. */
879 if (flag_declone_ctor_dtor
== -1)
880 flag_declone_ctor_dtor
= optimize_size
;
882 if (warn_abi_version
== -1)
884 if (flag_abi_compat_version
!= -1)
885 warn_abi_version
= flag_abi_compat_version
;
887 warn_abi_version
= 0;
890 if (flag_abi_compat_version
== 1)
892 warning (0, "%<-fabi-compat-version=1%> is not supported, using =2");
893 flag_abi_compat_version
= 2;
895 else if (flag_abi_compat_version
== -1)
897 /* Generate compatibility aliases for ABI v10 (6.1) by default. */
898 flag_abi_compat_version
899 = (flag_abi_version
== 0 ? 10 : 0);
902 /* Change flag_abi_version to be the actual current ABI level for the
903 benefit of c_cpp_builtins. */
904 if (flag_abi_version
== 0)
905 flag_abi_version
= 11;
907 if (cxx_dialect
>= cxx11
)
909 /* If we're allowing C++0x constructs, don't warn about C++98
910 identifiers which are keywords in C++0x. */
911 warn_cxx11_compat
= 0;
912 cpp_opts
->cpp_warn_cxx11_compat
= 0;
914 if (warn_narrowing
== -1)
917 else if (warn_narrowing
== -1)
920 /* C++17 has stricter evaluation order requirements; let's use some of them
921 for earlier C++ as well, so chaining works as expected. */
923 && flag_strong_eval_order
== -1)
924 flag_strong_eval_order
= (cxx_dialect
>= cxx1z
? 2 : 1);
926 /* Global sized deallocation is new in C++14. */
927 if (flag_sized_deallocation
== -1)
928 flag_sized_deallocation
= (cxx_dialect
>= cxx14
);
930 if (flag_extern_tls_init
)
932 #if !defined (ASM_OUTPUT_DEF) || !SUPPORTS_WEAK
933 /* Lazy TLS initialization for a variable in another TU requires
934 alias and weak reference support. */
935 if (flag_extern_tls_init
> 0)
936 sorry ("external TLS initialization functions not supported "
938 flag_extern_tls_init
= 0;
940 flag_extern_tls_init
= 1;
944 if (flag_preprocess_only
)
946 /* Open the output now. We must do so even if flag_no_output is
947 on, because there may be other output than from the actual
948 preprocessing (e.g. from -dM). */
949 if (out_fname
[0] == '\0')
952 out_stream
= fopen (out_fname
, "w");
954 if (out_stream
== NULL
)
956 fatal_error (input_location
, "opening output file %s: %m", out_fname
);
960 if (num_in_fnames
> 1)
961 error ("too many filenames given. Type %s --help for usage",
964 init_pp_output (out_stream
);
970 /* When writing a PCH file, avoid reading some other PCH file,
971 because the default address space slot then can't be used
972 for the output PCH file. */
975 c_common_no_more_pch ();
976 /* Only -g0 and -gdwarf* are supported with PCH, for other
977 debug formats we warn here and refuse to load any PCH files. */
978 if (write_symbols
!= NO_DEBUG
&& write_symbols
!= DWARF2_DEBUG
)
979 warning (OPT_Wdeprecated
,
980 "the \"%s\" debug format cannot be used with "
981 "pre-compiled headers", debug_type_names
[write_symbols
]);
983 else if (write_symbols
!= NO_DEBUG
&& write_symbols
!= DWARF2_DEBUG
)
984 c_common_no_more_pch ();
986 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
987 input_location
= UNKNOWN_LOCATION
;
990 cb
= cpp_get_callbacks (parse_in
);
991 cb
->file_change
= cb_file_change
;
992 cb
->dir_change
= cb_dir_change
;
993 cpp_post_options (parse_in
);
994 init_global_opts_from_cpp (&global_options
, cpp_get_options (parse_in
));
996 input_location
= UNKNOWN_LOCATION
;
998 *pfilename
= this_input_filename
999 = cpp_read_main_file (parse_in
, in_fnames
[0]);
1000 /* Don't do any compilation or preprocessing if there is no input file. */
1001 if (this_input_filename
== NULL
)
1007 if (flag_working_directory
1008 && flag_preprocess_only
&& !flag_no_line_commands
)
1009 pp_dir_change (parse_in
, get_src_pwd ());
1011 /* Disable LTO output when outputting a precompiled header. */
1012 if (pch_file
&& flag_lto
)
1015 flag_generate_lto
= 0;
1018 return flag_preprocess_only
;
1021 /* Front end initialization common to C, ObjC and C++. */
1023 c_common_init (void)
1025 /* Set up preprocessor arithmetic. Must be done after call to
1026 c_common_nodes_and_builtins for type nodes to be good. */
1027 cpp_opts
->precision
= TYPE_PRECISION (intmax_type_node
);
1028 cpp_opts
->char_precision
= TYPE_PRECISION (char_type_node
);
1029 cpp_opts
->int_precision
= TYPE_PRECISION (integer_type_node
);
1030 cpp_opts
->wchar_precision
= TYPE_PRECISION (wchar_type_node
);
1031 cpp_opts
->unsigned_wchar
= TYPE_UNSIGNED (wchar_type_node
);
1032 cpp_opts
->bytes_big_endian
= BYTES_BIG_ENDIAN
;
1034 /* This can't happen until after wchar_precision and bytes_big_endian
1036 cpp_init_iconv (parse_in
);
1041 fputs ("Compiler executable checksum: ", stderr
);
1042 for (i
= 0; i
< 16; i
++)
1043 fprintf (stderr
, "%02x", executable_checksum
[i
]);
1044 putc ('\n', stderr
);
1047 /* Has to wait until now so that cpplib has its hash table. */
1050 if (flag_preprocess_only
)
1052 c_finish_options ();
1053 preprocess_file (parse_in
);
1060 /* Initialize the integrated preprocessor after debug output has been
1061 initialized; loop over each input file. */
1063 c_common_parse_file (void)
1070 c_finish_options ();
1071 /* Open the dump files to use for the original and class dump output
1072 here, to be used during parsing for the current file. */
1073 original_dump_file
= dump_begin (TDI_original
, &original_dump_flags
);
1074 class_dump_file
= dump_begin (TDI_class
, &class_dump_flags
);
1079 /* And end the main input file, if the debug writer wants it */
1080 if (debug_hooks
->start_end_main_source_file
)
1081 (*debug_hooks
->end_source_file
) (0);
1082 if (++i
>= num_in_fnames
)
1084 cpp_undef_all (parse_in
);
1085 cpp_clear_file_cache (parse_in
);
1087 = cpp_read_main_file (parse_in
, in_fnames
[i
]);
1088 if (original_dump_file
)
1090 dump_end (TDI_original
, original_dump_file
);
1091 original_dump_file
= NULL
;
1093 if (class_dump_file
)
1095 dump_end (TDI_class
, class_dump_file
);
1096 class_dump_file
= NULL
;
1098 /* If an input file is missing, abandon further compilation.
1099 cpplib has issued a diagnostic. */
1100 if (!this_input_filename
)
1104 c_parse_final_cleanups ();
1107 /* Returns the appropriate dump file for PHASE to dump with FLAGS. */
1109 get_dump_info (int phase
, int *flags
)
1111 gcc_assert (phase
== TDI_original
|| phase
== TDI_class
);
1112 if (phase
== TDI_original
)
1114 *flags
= original_dump_flags
;
1115 return original_dump_file
;
1119 *flags
= class_dump_flags
;
1120 return class_dump_file
;
1124 /* Common finish hook for the C, ObjC and C++ front ends. */
1126 c_common_finish (void)
1128 FILE *deps_stream
= NULL
;
1130 /* Don't write the deps file if there are errors. */
1131 if (cpp_opts
->deps
.style
!= DEPS_NONE
&& !seen_error ())
1133 /* If -M or -MM was seen without -MF, default output to the
1136 deps_stream
= out_stream
;
1139 deps_stream
= fopen (deps_file
, deps_append
? "a": "w");
1141 fatal_error (input_location
, "opening dependency file %s: %m",
1146 /* For performance, avoid tearing down cpplib's internal structures
1147 with cpp_destroy (). */
1148 cpp_finish (parse_in
, deps_stream
);
1150 if (deps_stream
&& deps_stream
!= out_stream
1151 && (ferror (deps_stream
) || fclose (deps_stream
)))
1152 fatal_error (input_location
, "closing dependency file %s: %m", deps_file
);
1154 if (out_stream
&& (ferror (out_stream
) || fclose (out_stream
)))
1155 fatal_error (input_location
, "when writing output to %s: %m", out_fname
);
1158 /* Either of two environment variables can specify output of
1159 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1160 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1161 and DEPS_TARGET is the target to mention in the deps. They also
1162 result in dependency information being appended to the output file
1163 rather than overwriting it, and like Sun's compiler
1164 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1166 check_deps_environment_vars (void)
1170 spec
= getenv ("DEPENDENCIES_OUTPUT");
1172 cpp_opts
->deps
.style
= DEPS_USER
;
1175 spec
= getenv ("SUNPRO_DEPENDENCIES");
1178 cpp_opts
->deps
.style
= DEPS_SYSTEM
;
1179 cpp_opts
->deps
.ignore_main_file
= true;
1185 /* Find the space before the DEPS_TARGET, if there is one. */
1186 char *s
= strchr (spec
, ' ');
1189 /* Let the caller perform MAKE quoting. */
1190 defer_opt (OPT_MT
, s
+ 1);
1194 /* Command line -MF overrides environment variables and default. */
1203 /* Handle deferred command line switches. */
1205 handle_deferred_opts (void)
1210 /* Avoid allocating the deps buffer if we don't need it.
1211 (This flag may be true without there having been -MT or -MQ
1212 options, but we'll still need the deps buffer.) */
1216 deps
= cpp_get_deps (parse_in
);
1218 for (i
= 0; i
< deferred_count
; i
++)
1220 struct deferred_opt
*opt
= &deferred_opts
[i
];
1222 if (opt
->code
== OPT_MT
|| opt
->code
== OPT_MQ
)
1223 deps_add_target (deps
, opt
->arg
, opt
->code
== OPT_MQ
);
1227 /* These settings are appropriate for GCC, but not necessarily so for
1228 cpplib as a library. */
1230 sanitize_cpp_opts (void)
1232 /* If we don't know what style of dependencies to output, complain
1233 if any other dependency switches have been given. */
1234 if (deps_seen
&& cpp_opts
->deps
.style
== DEPS_NONE
)
1235 error ("to generate dependencies you must specify either -M or -MM");
1237 /* -dM and dependencies suppress normal output; do it here so that
1238 the last -d[MDN] switch overrides earlier ones. */
1239 if (flag_dump_macros
== 'M')
1242 /* By default, -fdirectives-only implies -dD. This allows subsequent phases
1243 to perform proper macro expansion. */
1244 if (cpp_opts
->directives_only
&& !cpp_opts
->preprocessed
&& !flag_dump_macros
)
1245 flag_dump_macros
= 'D';
1247 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1248 -dM since at least glibc relies on -M -dM to work. */
1249 /* Also, flag_no_output implies flag_no_line_commands, always. */
1252 if (flag_dump_macros
!= 'M')
1253 flag_dump_macros
= 0;
1254 flag_dump_includes
= 0;
1255 flag_no_line_commands
= 1;
1257 else if (cpp_opts
->deps
.missing_files
)
1258 error ("-MG may only be used with -M or -MM");
1260 cpp_opts
->unsigned_char
= !flag_signed_char
;
1261 cpp_opts
->stdc_0_in_system_headers
= STDC_0_IN_SYSTEM_HEADERS
;
1263 /* Wlong-long is disabled by default. It is enabled by:
1264 [-Wpedantic | -Wtraditional] -std=[gnu|c]++98 ; or
1265 [-Wpedantic | -Wtraditional] -std=non-c99
1267 Either -Wlong-long or -Wno-long-long override any other settings.
1268 ??? These conditions should be handled in c.opt. */
1269 if (warn_long_long
== -1)
1271 warn_long_long
= ((pedantic
|| warn_traditional
)
1272 && (c_dialect_cxx () ? cxx_dialect
== cxx98
: !flag_isoc99
));
1273 cpp_opts
->cpp_warn_long_long
= warn_long_long
;
1276 /* If we're generating preprocessor output, emit current directory
1277 if explicitly requested or if debugging information is enabled.
1278 ??? Maybe we should only do it for debugging formats that
1279 actually output the current directory? */
1280 if (flag_working_directory
== -1)
1281 flag_working_directory
= (debug_info_level
!= DINFO_LEVEL_NONE
);
1283 if (warn_implicit_fallthrough
< 5)
1284 cpp_opts
->cpp_warn_implicit_fallthrough
= warn_implicit_fallthrough
;
1286 cpp_opts
->cpp_warn_implicit_fallthrough
= 0;
1288 if (cpp_opts
->directives_only
)
1290 if (cpp_warn_unused_macros
)
1291 error ("-fdirectives-only is incompatible with -Wunused_macros");
1292 if (cpp_opts
->traditional
)
1293 error ("-fdirectives-only is incompatible with -traditional");
1297 /* Add include path with a prefix at the front of its name. */
1299 add_prefixed_path (const char *suffix
, size_t chain
)
1303 size_t prefix_len
, suffix_len
;
1305 suffix_len
= strlen (suffix
);
1306 prefix
= iprefix
? iprefix
: cpp_GCC_INCLUDE_DIR
;
1307 prefix_len
= iprefix
? strlen (iprefix
) : cpp_GCC_INCLUDE_DIR_len
;
1309 path
= (char *) xmalloc (prefix_len
+ suffix_len
+ 1);
1310 memcpy (path
, prefix
, prefix_len
);
1311 memcpy (path
+ prefix_len
, suffix
, suffix_len
);
1312 path
[prefix_len
+ suffix_len
] = '\0';
1314 add_path (path
, chain
, 0, false);
1317 /* Handle -D, -U, -A, -imacros, and the first -include. */
1319 c_finish_options (void)
1321 if (!cpp_opts
->preprocessed
)
1325 cb_file_change (parse_in
,
1326 linemap_check_ordinary (linemap_add (line_table
,
1330 /* Make sure all of the builtins about to be declared have
1331 BUILTINS_LOCATION has their source_location. */
1332 source_location builtins_loc
= BUILTINS_LOCATION
;
1333 cpp_force_token_locations (parse_in
, &builtins_loc
);
1335 cpp_init_builtins (parse_in
, flag_hosted
);
1336 c_cpp_builtins (parse_in
);
1338 cpp_stop_forcing_token_locations (parse_in
);
1340 /* We're about to send user input to cpplib, so make it warn for
1341 things that we previously (when we sent it internal definitions)
1342 told it to not warn.
1344 C99 permits implementation-defined characters in identifiers.
1345 The documented meaning of -std= is to turn off extensions that
1346 conflict with the specified standard, and since a strictly
1347 conforming program cannot contain a '$', we do not condition
1348 their acceptance on the -std= setting. */
1349 cpp_opts
->warn_dollars
= (cpp_opts
->cpp_pedantic
&& !cpp_opts
->c99
);
1351 cb_file_change (parse_in
,
1352 linemap_check_ordinary (linemap_add (line_table
, LC_RENAME
, 0,
1353 _("<command-line>"), 0)));
1355 for (i
= 0; i
< deferred_count
; i
++)
1357 struct deferred_opt
*opt
= &deferred_opts
[i
];
1359 if (opt
->code
== OPT_D
)
1360 cpp_define (parse_in
, opt
->arg
);
1361 else if (opt
->code
== OPT_U
)
1362 cpp_undef (parse_in
, opt
->arg
);
1363 else if (opt
->code
== OPT_A
)
1365 if (opt
->arg
[0] == '-')
1366 cpp_unassert (parse_in
, opt
->arg
+ 1);
1368 cpp_assert (parse_in
, opt
->arg
);
1372 /* Start the main input file, if the debug writer wants it. */
1373 if (debug_hooks
->start_end_main_source_file
1374 && !flag_preprocess_only
)
1375 (*debug_hooks
->start_source_file
) (0, this_input_filename
);
1377 /* Handle -imacros after -D and -U. */
1378 for (i
= 0; i
< deferred_count
; i
++)
1380 struct deferred_opt
*opt
= &deferred_opts
[i
];
1382 if (opt
->code
== OPT_imacros
1383 && cpp_push_include (parse_in
, opt
->arg
))
1385 /* Disable push_command_line_include callback for now. */
1386 include_cursor
= deferred_count
+ 1;
1387 cpp_scan_nooutput (parse_in
);
1393 if (cpp_opts
->directives_only
)
1394 cpp_init_special_builtins (parse_in
);
1396 /* Start the main input file, if the debug writer wants it. */
1397 if (debug_hooks
->start_end_main_source_file
1398 && !flag_preprocess_only
)
1399 (*debug_hooks
->start_source_file
) (0, this_input_filename
);
1403 push_command_line_include ();
1406 /* Give CPP the next file given by -include, if any. */
1408 push_command_line_include (void)
1410 /* This can happen if disabled by -imacros for example.
1411 Punt so that we don't set "<command-line>" as the filename for
1413 if (include_cursor
> deferred_count
)
1416 if (!done_preinclude
)
1418 done_preinclude
= true;
1419 if (flag_hosted
&& std_inc
&& !cpp_opts
->preprocessed
)
1421 const char *preinc
= targetcm
.c_preinclude ();
1422 if (preinc
&& cpp_push_default_include (parse_in
, preinc
))
1427 pch_cpp_save_state ();
1429 while (include_cursor
< deferred_count
)
1431 struct deferred_opt
*opt
= &deferred_opts
[include_cursor
++];
1433 if (!cpp_opts
->preprocessed
&& opt
->code
== OPT_include
1434 && cpp_push_include (parse_in
, opt
->arg
))
1438 if (include_cursor
== deferred_count
)
1441 /* -Wunused-macros should only warn about macros defined hereafter. */
1442 cpp_opts
->warn_unused_macros
= cpp_warn_unused_macros
;
1443 /* Restore the line map from <command line>. */
1444 if (!cpp_opts
->preprocessed
)
1445 cpp_change_file (parse_in
, LC_RENAME
, this_input_filename
);
1447 /* Set this here so the client can change the option if it wishes,
1448 and after stacking the main file so we don't trace the main file. */
1449 line_table
->trace_includes
= cpp_opts
->print_include_names
;
1453 /* File change callback. Has to handle -include files. */
1455 cb_file_change (cpp_reader
* ARG_UNUSED (pfile
),
1456 const line_map_ordinary
*new_map
)
1458 if (flag_preprocess_only
)
1459 pp_file_change (new_map
);
1461 fe_file_change (new_map
);
1464 && (new_map
->reason
== LC_ENTER
|| new_map
->reason
== LC_RENAME
))
1466 /* Signal to plugins that a file is included. This could happen
1467 several times with the same file path, e.g. because of
1468 several '#include' or '#line' directives... */
1469 invoke_plugin_callbacks
1470 (PLUGIN_INCLUDE_FILE
,
1471 const_cast<char*> (ORDINARY_MAP_FILE_NAME (new_map
)));
1474 if (new_map
== 0 || (new_map
->reason
== LC_LEAVE
&& MAIN_FILE_P (new_map
)))
1476 pch_cpp_save_state ();
1477 push_command_line_include ();
1482 cb_dir_change (cpp_reader
* ARG_UNUSED (pfile
), const char *dir
)
1484 if (!set_src_pwd (dir
))
1485 warning (0, "too late for # directive to set debug directory");
1488 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1489 extensions if ISO). There is no concept of gnu94. */
1491 set_std_c89 (int c94
, int iso
)
1493 cpp_set_lang (parse_in
, c94
? CLK_STDC94
: iso
? CLK_STDC89
: CLK_GNUC89
);
1496 flag_no_gnu_keywords
= iso
;
1497 flag_no_nonansi_builtin
= iso
;
1501 lang_hooks
.name
= "GNU C89";
1504 /* Set the C 99 standard (without GNU extensions if ISO). */
1506 set_std_c99 (int iso
)
1508 cpp_set_lang (parse_in
, iso
? CLK_STDC99
: CLK_GNUC99
);
1510 flag_no_nonansi_builtin
= iso
;
1515 lang_hooks
.name
= "GNU C99";
1518 /* Set the C 11 standard (without GNU extensions if ISO). */
1520 set_std_c11 (int iso
)
1522 cpp_set_lang (parse_in
, iso
? CLK_STDC11
: CLK_GNUC11
);
1524 flag_no_nonansi_builtin
= iso
;
1529 lang_hooks
.name
= "GNU C11";
1532 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1534 set_std_cxx98 (int iso
)
1536 cpp_set_lang (parse_in
, iso
? CLK_CXX98
: CLK_GNUCXX
);
1537 flag_no_gnu_keywords
= iso
;
1538 flag_no_nonansi_builtin
= iso
;
1542 cxx_dialect
= cxx98
;
1543 lang_hooks
.name
= "GNU C++98";
1546 /* Set the C++ 2011 standard (without GNU extensions if ISO). */
1548 set_std_cxx11 (int iso
)
1550 cpp_set_lang (parse_in
, iso
? CLK_CXX11
: CLK_GNUCXX11
);
1551 flag_no_gnu_keywords
= iso
;
1552 flag_no_nonansi_builtin
= iso
;
1554 /* C++11 includes the C99 standard library. */
1557 cxx_dialect
= cxx11
;
1558 lang_hooks
.name
= "GNU C++11";
1561 /* Set the C++ 2014 draft standard (without GNU extensions if ISO). */
1563 set_std_cxx14 (int iso
)
1565 cpp_set_lang (parse_in
, iso
? CLK_CXX14
: CLK_GNUCXX14
);
1566 flag_no_gnu_keywords
= iso
;
1567 flag_no_nonansi_builtin
= iso
;
1569 /* C++11 includes the C99 standard library. */
1572 cxx_dialect
= cxx14
;
1573 lang_hooks
.name
= "GNU C++14";
1576 /* Set the C++ 201z draft standard (without GNU extensions if ISO). */
1578 set_std_cxx1z (int iso
)
1580 cpp_set_lang (parse_in
, iso
? CLK_CXX1Z
: CLK_GNUCXX1Z
);
1581 flag_no_gnu_keywords
= iso
;
1582 flag_no_nonansi_builtin
= iso
;
1584 /* C++11 includes the C99 standard library. */
1588 cxx_dialect
= cxx1z
;
1589 lang_hooks
.name
= "GNU C++14"; /* Pretend C++14 till standarization. */
1592 /* Args to -d specify what to dump. Silently ignore
1593 unrecognized options; they may be aimed at toplev.c. */
1595 handle_OPT_d (const char *arg
)
1599 while ((c
= *arg
++) != '\0')
1602 case 'M': /* Dump macros only. */
1603 case 'N': /* Dump names. */
1604 case 'D': /* Dump definitions. */
1605 case 'U': /* Dump used macros. */
1606 flag_dump_macros
= c
;
1610 flag_dump_includes
= 1;