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"
27 #include "tm_p.h" /* For C_COMMON_OVERRIDE_OPTIONS. */
28 #include "diagnostic.h"
32 #include "langhooks.h"
33 #include "tree-diagnostic.h" /* for virt_loc_aware_diagnostic_finalizer */
35 #include "cppdefault.h"
37 #include "debug.h" /* For debug_hooks. */
39 #include "plugin.h" /* For PLUGIN_INCLUDE_FILE event. */
43 #ifndef DOLLARS_IN_IDENTIFIERS
44 # define DOLLARS_IN_IDENTIFIERS true
47 #ifndef TARGET_SYSTEM_ROOT
48 # define TARGET_SYSTEM_ROOT NULL
52 #define TARGET_OPTF(ARG)
56 cpp_options
*cpp_opts
;
59 static const char *this_input_filename
;
61 /* Filename and stream for preprocessed output. */
62 static const char *out_fname
;
63 static FILE *out_stream
;
65 /* Append dependencies to deps_file. */
66 static bool deps_append
;
68 /* If dependency switches (-MF etc.) have been given. */
69 static bool deps_seen
;
74 /* Dependency output file. */
75 static const char *deps_file
;
77 /* The prefix given by -iprefix, if any. */
78 static const char *iprefix
;
80 /* The multilib directory given by -imultilib, if any. */
81 static const char *imultilib
;
83 /* The system root, if any. Overridden by -isysroot. */
84 static const char *sysroot
= TARGET_SYSTEM_ROOT
;
86 /* Zero disables all standard directories for headers. */
87 static bool std_inc
= true;
89 /* Zero disables the C++-specific standard directories for headers. */
90 static bool std_cxx_inc
= true;
92 /* If the quote chain has been split by -I-. */
93 static bool quote_chain_split
;
95 /* Number of deferred options. */
96 static size_t deferred_count
;
98 /* Number of deferred options scanned for -include. */
99 static size_t include_cursor
;
101 /* Dump files/flags to use during parsing. */
102 static FILE *original_dump_file
= NULL
;
103 static int original_dump_flags
;
104 static FILE *class_dump_file
= NULL
;
105 static int class_dump_flags
;
107 /* Whether any standard preincluded header has been preincluded. */
108 static bool done_preinclude
;
110 static void handle_OPT_d (const char *);
111 static void set_std_cxx98 (int);
112 static void set_std_cxx11 (int);
113 static void set_std_cxx14 (int);
114 static void set_std_cxx1z (int);
115 static void set_std_c89 (int, int);
116 static void set_std_c99 (int);
117 static void set_std_c11 (int);
118 static void check_deps_environment_vars (void);
119 static void handle_deferred_opts (void);
120 static void sanitize_cpp_opts (void);
121 static void add_prefixed_path (const char *, size_t);
122 static void push_command_line_include (void);
123 static void cb_file_change (cpp_reader
*, const line_map_ordinary
*);
124 static void cb_dir_change (cpp_reader
*, const char *);
125 static void c_finish_options (void);
127 #ifndef STDC_0_IN_SYSTEM_HEADERS
128 #define STDC_0_IN_SYSTEM_HEADERS 0
131 /* Holds switches parsed by c_common_handle_option (), but whose
132 handling is deferred to c_common_post_options (). */
133 static void defer_opt (enum opt_code
, const char *);
134 static struct deferred_opt
141 extern const unsigned int
142 c_family_lang_mask
= (CL_C
| CL_CXX
| CL_ObjC
| CL_ObjCXX
);
144 /* Defer option CODE with argument ARG. */
146 defer_opt (enum opt_code code
, const char *arg
)
148 deferred_opts
[deferred_count
].code
= code
;
149 deferred_opts
[deferred_count
].arg
= arg
;
153 /* Return language mask for option parsing. */
155 c_common_option_lang_mask (void)
157 static const unsigned int lang_flags
[] = {CL_C
, CL_ObjC
, CL_CXX
, CL_ObjCXX
};
159 return lang_flags
[c_language
];
162 /* Diagnostic finalizer for C/C++/Objective-C/Objective-C++. */
164 c_diagnostic_finalizer (diagnostic_context
*context
,
165 diagnostic_info
*diagnostic
)
167 diagnostic_show_locus (context
, diagnostic
->richloc
, diagnostic
->kind
);
168 /* By default print macro expansion contexts in the diagnostic
169 finalizer -- for tokens resulting from macro expansion. */
170 virt_loc_aware_diagnostic_finalizer (context
, diagnostic
);
171 pp_destroy_prefix (context
->printer
);
172 pp_flush (context
->printer
);
175 /* Common default settings for diagnostics. */
177 c_common_diagnostics_set_defaults (diagnostic_context
*context
)
179 diagnostic_finalizer (context
) = c_diagnostic_finalizer
;
180 context
->opt_permissive
= OPT_fpermissive
;
183 /* Whether options from all C-family languages should be accepted
185 static bool accept_all_c_family_options
= false;
187 /* Return whether to complain about a wrong-language option. */
189 c_common_complain_wrong_lang_p (const struct cl_option
*option
)
191 if (accept_all_c_family_options
192 && (option
->flags
& c_family_lang_mask
))
198 /* Initialize options structure OPTS. */
200 c_common_init_options_struct (struct gcc_options
*opts
)
202 opts
->x_flag_exceptions
= c_dialect_cxx ();
203 opts
->x_warn_pointer_arith
= c_dialect_cxx ();
204 opts
->x_warn_write_strings
= c_dialect_cxx ();
205 opts
->x_flag_warn_unused_result
= true;
207 /* By default, C99-like requirements for complex multiply and divide. */
208 opts
->x_flag_complex_method
= 2;
211 /* Common initialization before calling option handlers. */
213 c_common_init_options (unsigned int decoded_options_count
,
214 struct cl_decoded_option
*decoded_options
)
217 struct cpp_callbacks
*cb
;
220 = new (ggc_alloc
<string_concat_db
> ()) string_concat_db ();
222 parse_in
= cpp_create_reader (c_dialect_cxx () ? CLK_GNUCXX
: CLK_GNUC89
,
223 ident_hash
, line_table
);
224 cb
= cpp_get_callbacks (parse_in
);
225 cb
->error
= c_cpp_error
;
227 cpp_opts
= cpp_get_options (parse_in
);
228 cpp_opts
->dollars_in_ident
= DOLLARS_IN_IDENTIFIERS
;
229 cpp_opts
->objc
= c_dialect_objc ();
231 /* Reset to avoid warnings on internal definitions. We set it just
232 before passing on command-line options to cpplib. */
233 cpp_opts
->warn_dollars
= 0;
235 deferred_opts
= XNEWVEC (struct deferred_opt
, decoded_options_count
);
237 if (c_language
== clk_c
)
239 /* The default for C is gnu11. */
240 set_std_c11 (false /* ISO */);
242 /* If preprocessing assembly language, accept any of the C-family
243 front end options since the driver may pass them through. */
244 for (i
= 1; i
< decoded_options_count
; i
++)
245 if (decoded_options
[i
].opt_index
== OPT_lang_asm
)
247 accept_all_c_family_options
= true;
252 /* Set C++ standard to C++14 if not specified on the command line. */
253 if (c_dialect_cxx ())
254 set_std_cxx14 (/*ISO*/false);
256 global_dc
->colorize_source_p
= true;
259 /* Handle switch SCODE with argument ARG. VALUE is true, unless no-
260 form of an -f or -W option was given. Returns false if the switch was
261 invalid, true if valid. Use HANDLERS in recursive handle_option calls. */
263 c_common_handle_option (size_t scode
, const char *arg
, int value
,
264 int kind
, location_t loc
,
265 const struct cl_option_handlers
*handlers
)
267 const struct cl_option
*option
= &cl_options
[scode
];
268 enum opt_code code
= (enum opt_code
) scode
;
271 /* Prevent resetting the language standard to a C dialect when the driver
272 has already determined that we're looking at assembler input. */
273 bool preprocessing_asm_p
= (cpp_get_options (parse_in
)->lang
== CLK_ASM
);
278 if (cl_options
[code
].flags
& c_family_lang_mask
)
280 if ((option
->flags
& CL_TARGET
)
281 && ! targetcm
.handle_c_option (scode
, arg
, value
))
288 case OPT__output_pch_
:
293 defer_opt (code
, arg
);
297 cpp_opts
->discard_comments
= 0;
301 cpp_opts
->discard_comments
= 0;
302 cpp_opts
->discard_comments_in_macro_exp
= 0;
306 defer_opt (code
, arg
);
310 cpp_opts
->print_include_names
= 1;
314 TARGET_OPTF (xstrdup (arg
));
318 if (strcmp (arg
, "-"))
319 add_path (xstrdup (arg
), BRACKET
, 0, true);
322 if (quote_chain_split
)
323 error ("-I- specified twice");
324 quote_chain_split
= true;
325 split_quote_chain ();
326 inform (input_location
, "obsolete option -I- used, please use -iquote instead");
332 /* When doing dependencies with -M or -MM, suppress normal
333 preprocessed output, but still do -dM etc. as software
334 depends on this. Preprocessed output does occur if -MD, -MMD
335 or environment var dependency generation is used. */
336 cpp_opts
->deps
.style
= (code
== OPT_M
? DEPS_SYSTEM
: DEPS_USER
);
342 cpp_opts
->deps
.style
= (code
== OPT_MD
? DEPS_SYSTEM
: DEPS_USER
);
343 cpp_opts
->deps
.need_preprocessor_output
= true;
354 cpp_opts
->deps
.missing_files
= true;
359 cpp_opts
->deps
.phony_targets
= true;
365 defer_opt (code
, arg
);
369 flag_no_line_commands
= 1;
373 defer_opt (code
, arg
);
377 /* ??? Don't add new options here. Use LangEnabledBy in c.opt. */
379 cpp_opts
->warn_num_sign_change
= value
;
382 case OPT_Wunknown_pragmas
:
383 /* Set to greater than 1, so that even unknown pragmas in
384 system headers will be warned about. */
385 /* ??? There is no way to handle this automatically for now. */
386 warn_unknown_pragmas
= value
* 2;
390 if (!c_dialect_cxx ())
391 set_std_c89 (false, true);
393 set_std_cxx98 (true);
404 warning (0, "%<-Wabi=1%> is not supported, using =2");
407 warn_abi_version
= value
;
408 if (flag_abi_compat_version
== -1)
409 flag_abi_compat_version
= value
;
412 case OPT_fcanonical_system_headers
:
413 cpp_opts
->canonical_system_headers
= value
;
416 case OPT_fcond_mismatch
:
417 if (!c_dialect_cxx ())
419 flag_cond_mismatch
= value
;
422 warning (0, "switch %qs is no longer supported", option
->opt_text
);
429 disable_builtin_function (arg
);
432 case OPT_fdirectives_only
:
433 cpp_opts
->directives_only
= value
;
436 case OPT_fdollars_in_identifiers
:
437 cpp_opts
->dollars_in_ident
= value
;
440 case OPT_ffreestanding
:
445 flag_no_builtin
= !value
;
448 case OPT_fconstant_string_class_
:
449 constant_string_class_name
= arg
;
452 case OPT_fextended_identifiers
:
453 cpp_opts
->extended_identifiers
= value
;
456 case OPT_foperator_names
:
457 cpp_opts
->operator_names
= value
;
461 cpp_opts
->restore_pch_deps
= value
;
464 case OPT_fpch_preprocess
:
465 flag_pch_preprocess
= value
;
468 case OPT_fpermissive
:
469 flag_permissive
= value
;
470 global_dc
->permissive
= value
;
473 case OPT_fpreprocessed
:
474 cpp_opts
->preprocessed
= value
;
481 case OPT_ftrack_macro_expansion
:
486 case OPT_ftrack_macro_expansion_
:
487 if (arg
&& *arg
!= '\0')
488 cpp_opts
->track_macro_expansion
= value
;
490 cpp_opts
->track_macro_expansion
= 2;
494 flag_use_repository
= value
;
496 flag_implicit_templates
= 0;
500 /* It is documented that we silently ignore silly values. */
501 if (value
>= 1 && value
<= 100)
502 cpp_opts
->tabstop
= value
;
505 case OPT_fexec_charset_
:
506 cpp_opts
->narrow_charset
= arg
;
509 case OPT_fwide_exec_charset_
:
510 cpp_opts
->wide_charset
= arg
;
513 case OPT_finput_charset_
:
514 cpp_opts
->input_charset
= arg
;
517 case OPT_ftemplate_depth_
:
518 max_tinst_depth
= value
;
521 case OPT_fvisibility_inlines_hidden
:
522 visibility_options
.inlines_hidden
= value
;
525 case OPT_femit_struct_debug_baseonly
:
526 set_struct_debug_option (&global_options
, loc
, "base");
529 case OPT_femit_struct_debug_reduced
:
530 set_struct_debug_option (&global_options
, loc
,
531 "dir:ord:sys,dir:gen:any,ind:base");
534 case OPT_femit_struct_debug_detailed_
:
535 set_struct_debug_option (&global_options
, loc
, arg
);
538 case OPT_fext_numeric_literals
:
539 cpp_opts
->ext_numeric_literals
= value
;
543 add_path (xstrdup (arg
), AFTER
, 0, true);
548 defer_opt (code
, arg
);
560 add_path (xstrdup (arg
), QUOTE
, 0, true);
568 add_path (xstrdup (arg
), SYSTEM
, 0, true);
571 case OPT_iwithprefix
:
572 add_prefixed_path (arg
, SYSTEM
);
575 case OPT_iwithprefixbefore
:
576 add_prefixed_path (arg
, BRACKET
);
580 cpp_set_lang (parse_in
, CLK_ASM
);
581 cpp_opts
->dollars_in_ident
= false;
596 error ("output filename specified twice");
599 case OPT_print_objc_runtime_info
:
600 print_struct_values
= 1;
608 case OPT_std_gnu__98
:
609 if (!preprocessing_asm_p
)
610 set_std_cxx98 (code
== OPT_std_c__98
/* ISO */);
614 case OPT_std_gnu__11
:
615 if (!preprocessing_asm_p
)
617 set_std_cxx11 (code
== OPT_std_c__11
/* ISO */);
618 if (code
== OPT_std_c__11
)
619 cpp_opts
->ext_numeric_literals
= 0;
624 case OPT_std_gnu__14
:
625 if (!preprocessing_asm_p
)
627 set_std_cxx14 (code
== OPT_std_c__14
/* ISO */);
628 if (code
== OPT_std_c__14
)
629 cpp_opts
->ext_numeric_literals
= 0;
634 case OPT_std_gnu__1z
:
635 if (!preprocessing_asm_p
)
637 set_std_cxx1z (code
== OPT_std_c__1z
/* ISO */);
638 if (code
== OPT_std_c__1z
)
639 cpp_opts
->ext_numeric_literals
= 0;
644 case OPT_std_iso9899_199409
:
645 if (!preprocessing_asm_p
)
646 set_std_c89 (code
== OPT_std_iso9899_199409
/* c94 */, true /* ISO */);
650 if (!preprocessing_asm_p
)
651 set_std_c89 (false /* c94 */, false /* ISO */);
655 if (!preprocessing_asm_p
)
656 set_std_c99 (true /* ISO */);
660 if (!preprocessing_asm_p
)
661 set_std_c99 (false /* ISO */);
665 if (!preprocessing_asm_p
)
666 set_std_c11 (true /* ISO */);
670 if (!preprocessing_asm_p
)
671 set_std_c11 (false /* ISO */);
675 cpp_opts
->trigraphs
= 1;
678 case OPT_traditional_cpp
:
679 cpp_opts
->traditional
= 1;
690 C_handle_option_auto (&global_options
, &global_options_set
,
692 c_family_lang_mask
, kind
,
693 loc
, handlers
, global_dc
);
697 ObjC_handle_option_auto (&global_options
, &global_options_set
,
699 c_family_lang_mask
, kind
,
700 loc
, handlers
, global_dc
);
704 CXX_handle_option_auto (&global_options
, &global_options_set
,
706 c_family_lang_mask
, kind
,
707 loc
, handlers
, global_dc
);
711 ObjCXX_handle_option_auto (&global_options
, &global_options_set
,
713 c_family_lang_mask
, kind
,
714 loc
, handlers
, global_dc
);
721 cpp_handle_option_auto (&global_options
, scode
, cpp_opts
);
725 /* Default implementation of TARGET_HANDLE_C_OPTION. */
728 default_handle_c_option (size_t code ATTRIBUTE_UNUSED
,
729 const char *arg ATTRIBUTE_UNUSED
,
730 int value ATTRIBUTE_UNUSED
)
735 /* Post-switch processing. */
737 c_common_post_options (const char **pfilename
)
739 struct cpp_callbacks
*cb
;
741 /* Canonicalize the input and output filenames. */
742 if (in_fnames
== NULL
)
744 in_fnames
= XNEWVEC (const char *, 1);
747 else if (strcmp (in_fnames
[0], "-") == 0)
750 if (out_fname
== NULL
|| !strcmp (out_fname
, "-"))
753 if (cpp_opts
->deps
.style
== DEPS_NONE
)
754 check_deps_environment_vars ();
756 handle_deferred_opts ();
758 sanitize_cpp_opts ();
760 register_include_chains (parse_in
, sysroot
, iprefix
, imultilib
,
761 std_inc
, std_cxx_inc
&& c_dialect_cxx (), verbose
);
763 #ifdef C_COMMON_OVERRIDE_OPTIONS
764 /* Some machines may reject certain combinations of C
765 language-specific options. */
766 C_COMMON_OVERRIDE_OPTIONS
;
769 /* Excess precision other than "fast" requires front-end
771 if (c_dialect_cxx ())
773 if (flag_excess_precision_cmdline
== EXCESS_PRECISION_STANDARD
)
774 sorry ("-fexcess-precision=standard for C++");
775 flag_excess_precision_cmdline
= EXCESS_PRECISION_FAST
;
777 else if (flag_excess_precision_cmdline
== EXCESS_PRECISION_DEFAULT
)
778 flag_excess_precision_cmdline
= (flag_iso
779 ? EXCESS_PRECISION_STANDARD
780 : EXCESS_PRECISION_FAST
);
782 /* ISO C restricts floating-point expression contraction to within
783 source-language expressions (-ffp-contract=on, currently an alias
784 for -ffp-contract=off). */
787 && (global_options_set
.x_flag_fp_contract_mode
788 == (enum fp_contract_mode
) 0)
789 && flag_unsafe_math_optimizations
== 0)
790 flag_fp_contract_mode
= FP_CONTRACT_OFF
;
792 /* By default we use C99 inline semantics in GNU99 or C99 mode. C99
793 inline semantics are not supported in GNU89 or C89 mode. */
794 if (flag_gnu89_inline
== -1)
795 flag_gnu89_inline
= !flag_isoc99
;
796 else if (!flag_gnu89_inline
&& !flag_isoc99
)
797 error ("-fno-gnu89-inline is only supported in GNU99 or C99 mode");
799 /* Default to ObjC sjlj exception handling if NeXT runtime. */
800 if (flag_objc_sjlj_exceptions
< 0)
801 flag_objc_sjlj_exceptions
= flag_next_runtime
;
802 if (flag_objc_exceptions
&& !flag_objc_sjlj_exceptions
)
805 /* If -ffreestanding, -fno-hosted or -fno-builtin then disable
806 pattern recognition. */
807 if (!global_options_set
.x_flag_tree_loop_distribute_patterns
809 flag_tree_loop_distribute_patterns
= 0;
811 /* -Woverlength-strings is off by default, but is enabled by -Wpedantic.
812 It is never enabled in C++, as the minimum limit is not normative
814 if (c_dialect_cxx ())
815 warn_overlength_strings
= 0;
817 /* Wmain is enabled by default in C++ but not in C. */
818 /* Wmain is disabled by default for -ffreestanding (!flag_hosted),
819 even if -Wall or -Wpedantic was given (warn_main will be 2 if set
820 by -Wall, 1 if set by -Wmain). */
822 warn_main
= (c_dialect_cxx () && flag_hosted
) ? 1 : 0;
823 else if (warn_main
== 2)
824 warn_main
= flag_hosted
? 1 : 0;
826 /* In C, -Wall and -Wc++-compat enable -Wenum-compare; if it has not
827 yet been set, it is disabled by default. In C++, it is enabled
829 if (warn_enum_compare
== -1)
830 warn_enum_compare
= c_dialect_cxx () ? 1 : 0;
832 /* -Wpacked-bitfield-compat is on by default for the C languages. The
833 warning is issued in stor-layout.c which is not part of the front-end so
834 we need to selectively turn it on here. */
835 if (warn_packed_bitfield_compat
== -1)
836 warn_packed_bitfield_compat
= 1;
838 /* Special format checking options don't work without -Wformat; warn if
842 warning (OPT_Wformat_y2k
,
843 "-Wformat-y2k ignored without -Wformat");
844 warning (OPT_Wformat_extra_args
,
845 "-Wformat-extra-args ignored without -Wformat");
846 warning (OPT_Wformat_zero_length
,
847 "-Wformat-zero-length ignored without -Wformat");
848 warning (OPT_Wformat_nonliteral
,
849 "-Wformat-nonliteral ignored without -Wformat");
850 warning (OPT_Wformat_contains_nul
,
851 "-Wformat-contains-nul ignored without -Wformat");
852 warning (OPT_Wformat_security
,
853 "-Wformat-security ignored without -Wformat");
856 /* -Wimplicit-function-declaration is enabled by default for C99. */
857 if (warn_implicit_function_declaration
== -1)
858 warn_implicit_function_declaration
= flag_isoc99
;
860 /* -Wimplicit-int is enabled by default for C99. */
861 if (warn_implicit_int
== -1)
862 warn_implicit_int
= flag_isoc99
;
864 /* -Wshift-overflow is enabled by default in C99 and C++11 modes. */
865 if (warn_shift_overflow
== -1)
866 warn_shift_overflow
= cxx_dialect
>= cxx11
|| flag_isoc99
;
868 /* -Wshift-negative-value is enabled by -Wextra in C99 and C++11 modes. */
869 if (warn_shift_negative_value
== -1)
870 warn_shift_negative_value
= (extra_warnings
871 && (cxx_dialect
>= cxx11
|| flag_isoc99
));
873 /* Declone C++ 'structors if -Os. */
874 if (flag_declone_ctor_dtor
== -1)
875 flag_declone_ctor_dtor
= optimize_size
;
877 if (warn_abi_version
== -1)
879 if (flag_abi_compat_version
!= -1)
880 warn_abi_version
= flag_abi_compat_version
;
882 warn_abi_version
= 0;
885 if (flag_abi_compat_version
== 1)
887 warning (0, "%<-fabi-compat-version=1%> is not supported, using =2");
888 flag_abi_compat_version
= 2;
890 else if (flag_abi_compat_version
== -1)
892 /* Generate compatibility aliases for ABI v10 (6.1) by default. */
893 flag_abi_compat_version
894 = (flag_abi_version
== 0 ? 10 : 0);
897 /* Change flag_abi_version to be the actual current ABI level for the
898 benefit of c_cpp_builtins. */
899 if (flag_abi_version
== 0)
900 flag_abi_version
= 11;
902 if (cxx_dialect
>= cxx11
)
904 /* If we're allowing C++0x constructs, don't warn about C++98
905 identifiers which are keywords in C++0x. */
906 warn_cxx11_compat
= 0;
907 cpp_opts
->cpp_warn_cxx11_compat
= 0;
909 if (warn_narrowing
== -1)
912 else if (warn_narrowing
== -1)
915 /* C++17 has stricter evaluation order requirements; let's use some of them
916 for earlier C++ as well, so chaining works as expected. */
918 && flag_strong_eval_order
== -1)
919 flag_strong_eval_order
= (cxx_dialect
>= cxx1z
? 2 : 1);
921 /* Global sized deallocation is new in C++14. */
922 if (flag_sized_deallocation
== -1)
923 flag_sized_deallocation
= (cxx_dialect
>= cxx14
);
925 if (flag_extern_tls_init
)
927 #if !defined (ASM_OUTPUT_DEF) || !SUPPORTS_WEAK
928 /* Lazy TLS initialization for a variable in another TU requires
929 alias and weak reference support. */
930 if (flag_extern_tls_init
> 0)
931 sorry ("external TLS initialization functions not supported "
933 flag_extern_tls_init
= 0;
935 flag_extern_tls_init
= 1;
939 if (flag_preprocess_only
)
941 /* Open the output now. We must do so even if flag_no_output is
942 on, because there may be other output than from the actual
943 preprocessing (e.g. from -dM). */
944 if (out_fname
[0] == '\0')
947 out_stream
= fopen (out_fname
, "w");
949 if (out_stream
== NULL
)
951 fatal_error (input_location
, "opening output file %s: %m", out_fname
);
955 if (num_in_fnames
> 1)
956 error ("too many filenames given. Type %s --help for usage",
959 init_pp_output (out_stream
);
965 /* When writing a PCH file, avoid reading some other PCH file,
966 because the default address space slot then can't be used
967 for the output PCH file. */
970 c_common_no_more_pch ();
971 /* Only -g0 and -gdwarf* are supported with PCH, for other
972 debug formats we warn here and refuse to load any PCH files. */
973 if (write_symbols
!= NO_DEBUG
&& write_symbols
!= DWARF2_DEBUG
)
974 warning (OPT_Wdeprecated
,
975 "the \"%s\" debug format cannot be used with "
976 "pre-compiled headers", debug_type_names
[write_symbols
]);
978 else if (write_symbols
!= NO_DEBUG
&& write_symbols
!= DWARF2_DEBUG
)
979 c_common_no_more_pch ();
981 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
982 input_location
= UNKNOWN_LOCATION
;
985 cb
= cpp_get_callbacks (parse_in
);
986 cb
->file_change
= cb_file_change
;
987 cb
->dir_change
= cb_dir_change
;
988 cpp_post_options (parse_in
);
989 init_global_opts_from_cpp (&global_options
, cpp_get_options (parse_in
));
991 input_location
= UNKNOWN_LOCATION
;
993 *pfilename
= this_input_filename
994 = cpp_read_main_file (parse_in
, in_fnames
[0]);
995 /* Don't do any compilation or preprocessing if there is no input file. */
996 if (this_input_filename
== NULL
)
1002 if (flag_working_directory
1003 && flag_preprocess_only
&& !flag_no_line_commands
)
1004 pp_dir_change (parse_in
, get_src_pwd ());
1006 /* Disable LTO output when outputting a precompiled header. */
1007 if (pch_file
&& flag_lto
)
1010 flag_generate_lto
= 0;
1013 return flag_preprocess_only
;
1016 /* Front end initialization common to C, ObjC and C++. */
1018 c_common_init (void)
1020 /* Set up preprocessor arithmetic. Must be done after call to
1021 c_common_nodes_and_builtins for type nodes to be good. */
1022 cpp_opts
->precision
= TYPE_PRECISION (intmax_type_node
);
1023 cpp_opts
->char_precision
= TYPE_PRECISION (char_type_node
);
1024 cpp_opts
->int_precision
= TYPE_PRECISION (integer_type_node
);
1025 cpp_opts
->wchar_precision
= TYPE_PRECISION (wchar_type_node
);
1026 cpp_opts
->unsigned_wchar
= TYPE_UNSIGNED (wchar_type_node
);
1027 cpp_opts
->bytes_big_endian
= BYTES_BIG_ENDIAN
;
1029 /* This can't happen until after wchar_precision and bytes_big_endian
1031 cpp_init_iconv (parse_in
);
1036 fputs ("Compiler executable checksum: ", stderr
);
1037 for (i
= 0; i
< 16; i
++)
1038 fprintf (stderr
, "%02x", executable_checksum
[i
]);
1039 putc ('\n', stderr
);
1042 /* Has to wait until now so that cpplib has its hash table. */
1045 if (flag_preprocess_only
)
1047 c_finish_options ();
1048 preprocess_file (parse_in
);
1055 /* Initialize the integrated preprocessor after debug output has been
1056 initialized; loop over each input file. */
1058 c_common_parse_file (void)
1065 c_finish_options ();
1066 /* Open the dump files to use for the original and class dump output
1067 here, to be used during parsing for the current file. */
1068 original_dump_file
= dump_begin (TDI_original
, &original_dump_flags
);
1069 class_dump_file
= dump_begin (TDI_class
, &class_dump_flags
);
1074 /* And end the main input file, if the debug writer wants it */
1075 if (debug_hooks
->start_end_main_source_file
)
1076 (*debug_hooks
->end_source_file
) (0);
1077 if (++i
>= num_in_fnames
)
1079 cpp_undef_all (parse_in
);
1080 cpp_clear_file_cache (parse_in
);
1082 = cpp_read_main_file (parse_in
, in_fnames
[i
]);
1083 if (original_dump_file
)
1085 dump_end (TDI_original
, original_dump_file
);
1086 original_dump_file
= NULL
;
1088 if (class_dump_file
)
1090 dump_end (TDI_class
, class_dump_file
);
1091 class_dump_file
= NULL
;
1093 /* If an input file is missing, abandon further compilation.
1094 cpplib has issued a diagnostic. */
1095 if (!this_input_filename
)
1099 c_parse_final_cleanups ();
1102 /* Returns the appropriate dump file for PHASE to dump with FLAGS. */
1104 get_dump_info (int phase
, int *flags
)
1106 gcc_assert (phase
== TDI_original
|| phase
== TDI_class
);
1107 if (phase
== TDI_original
)
1109 *flags
= original_dump_flags
;
1110 return original_dump_file
;
1114 *flags
= class_dump_flags
;
1115 return class_dump_file
;
1119 /* Common finish hook for the C, ObjC and C++ front ends. */
1121 c_common_finish (void)
1123 FILE *deps_stream
= NULL
;
1125 /* Don't write the deps file if there are errors. */
1126 if (cpp_opts
->deps
.style
!= DEPS_NONE
&& !seen_error ())
1128 /* If -M or -MM was seen without -MF, default output to the
1131 deps_stream
= out_stream
;
1134 deps_stream
= fopen (deps_file
, deps_append
? "a": "w");
1136 fatal_error (input_location
, "opening dependency file %s: %m",
1141 /* For performance, avoid tearing down cpplib's internal structures
1142 with cpp_destroy (). */
1143 cpp_finish (parse_in
, deps_stream
);
1145 if (deps_stream
&& deps_stream
!= out_stream
1146 && (ferror (deps_stream
) || fclose (deps_stream
)))
1147 fatal_error (input_location
, "closing dependency file %s: %m", deps_file
);
1149 if (out_stream
&& (ferror (out_stream
) || fclose (out_stream
)))
1150 fatal_error (input_location
, "when writing output to %s: %m", out_fname
);
1153 /* Either of two environment variables can specify output of
1154 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1155 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1156 and DEPS_TARGET is the target to mention in the deps. They also
1157 result in dependency information being appended to the output file
1158 rather than overwriting it, and like Sun's compiler
1159 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1161 check_deps_environment_vars (void)
1165 spec
= getenv ("DEPENDENCIES_OUTPUT");
1167 cpp_opts
->deps
.style
= DEPS_USER
;
1170 spec
= getenv ("SUNPRO_DEPENDENCIES");
1173 cpp_opts
->deps
.style
= DEPS_SYSTEM
;
1174 cpp_opts
->deps
.ignore_main_file
= true;
1180 /* Find the space before the DEPS_TARGET, if there is one. */
1181 char *s
= strchr (spec
, ' ');
1184 /* Let the caller perform MAKE quoting. */
1185 defer_opt (OPT_MT
, s
+ 1);
1189 /* Command line -MF overrides environment variables and default. */
1198 /* Handle deferred command line switches. */
1200 handle_deferred_opts (void)
1205 /* Avoid allocating the deps buffer if we don't need it.
1206 (This flag may be true without there having been -MT or -MQ
1207 options, but we'll still need the deps buffer.) */
1211 deps
= cpp_get_deps (parse_in
);
1213 for (i
= 0; i
< deferred_count
; i
++)
1215 struct deferred_opt
*opt
= &deferred_opts
[i
];
1217 if (opt
->code
== OPT_MT
|| opt
->code
== OPT_MQ
)
1218 deps_add_target (deps
, opt
->arg
, opt
->code
== OPT_MQ
);
1222 /* These settings are appropriate for GCC, but not necessarily so for
1223 cpplib as a library. */
1225 sanitize_cpp_opts (void)
1227 /* If we don't know what style of dependencies to output, complain
1228 if any other dependency switches have been given. */
1229 if (deps_seen
&& cpp_opts
->deps
.style
== DEPS_NONE
)
1230 error ("to generate dependencies you must specify either -M or -MM");
1232 /* -dM and dependencies suppress normal output; do it here so that
1233 the last -d[MDN] switch overrides earlier ones. */
1234 if (flag_dump_macros
== 'M')
1237 /* By default, -fdirectives-only implies -dD. This allows subsequent phases
1238 to perform proper macro expansion. */
1239 if (cpp_opts
->directives_only
&& !cpp_opts
->preprocessed
&& !flag_dump_macros
)
1240 flag_dump_macros
= 'D';
1242 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1243 -dM since at least glibc relies on -M -dM to work. */
1244 /* Also, flag_no_output implies flag_no_line_commands, always. */
1247 if (flag_dump_macros
!= 'M')
1248 flag_dump_macros
= 0;
1249 flag_dump_includes
= 0;
1250 flag_no_line_commands
= 1;
1252 else if (cpp_opts
->deps
.missing_files
)
1253 error ("-MG may only be used with -M or -MM");
1255 cpp_opts
->unsigned_char
= !flag_signed_char
;
1256 cpp_opts
->stdc_0_in_system_headers
= STDC_0_IN_SYSTEM_HEADERS
;
1258 /* Wlong-long is disabled by default. It is enabled by:
1259 [-Wpedantic | -Wtraditional] -std=[gnu|c]++98 ; or
1260 [-Wpedantic | -Wtraditional] -std=non-c99
1262 Either -Wlong-long or -Wno-long-long override any other settings.
1263 ??? These conditions should be handled in c.opt. */
1264 if (warn_long_long
== -1)
1266 warn_long_long
= ((pedantic
|| warn_traditional
)
1267 && (c_dialect_cxx () ? cxx_dialect
== cxx98
: !flag_isoc99
));
1268 cpp_opts
->cpp_warn_long_long
= warn_long_long
;
1271 /* If we're generating preprocessor output, emit current directory
1272 if explicitly requested or if debugging information is enabled.
1273 ??? Maybe we should only do it for debugging formats that
1274 actually output the current directory? */
1275 if (flag_working_directory
== -1)
1276 flag_working_directory
= (debug_info_level
!= DINFO_LEVEL_NONE
);
1278 if (cpp_opts
->directives_only
)
1280 if (cpp_warn_unused_macros
)
1281 error ("-fdirectives-only is incompatible with -Wunused_macros");
1282 if (cpp_opts
->traditional
)
1283 error ("-fdirectives-only is incompatible with -traditional");
1287 /* Add include path with a prefix at the front of its name. */
1289 add_prefixed_path (const char *suffix
, size_t chain
)
1293 size_t prefix_len
, suffix_len
;
1295 suffix_len
= strlen (suffix
);
1296 prefix
= iprefix
? iprefix
: cpp_GCC_INCLUDE_DIR
;
1297 prefix_len
= iprefix
? strlen (iprefix
) : cpp_GCC_INCLUDE_DIR_len
;
1299 path
= (char *) xmalloc (prefix_len
+ suffix_len
+ 1);
1300 memcpy (path
, prefix
, prefix_len
);
1301 memcpy (path
+ prefix_len
, suffix
, suffix_len
);
1302 path
[prefix_len
+ suffix_len
] = '\0';
1304 add_path (path
, chain
, 0, false);
1307 /* Handle -D, -U, -A, -imacros, and the first -include. */
1309 c_finish_options (void)
1311 if (!cpp_opts
->preprocessed
)
1315 cb_file_change (parse_in
,
1316 linemap_check_ordinary (linemap_add (line_table
,
1320 /* Make sure all of the builtins about to be declared have
1321 BUILTINS_LOCATION has their source_location. */
1322 source_location builtins_loc
= BUILTINS_LOCATION
;
1323 cpp_force_token_locations (parse_in
, &builtins_loc
);
1325 cpp_init_builtins (parse_in
, flag_hosted
);
1326 c_cpp_builtins (parse_in
);
1328 cpp_stop_forcing_token_locations (parse_in
);
1330 /* We're about to send user input to cpplib, so make it warn for
1331 things that we previously (when we sent it internal definitions)
1332 told it to not warn.
1334 C99 permits implementation-defined characters in identifiers.
1335 The documented meaning of -std= is to turn off extensions that
1336 conflict with the specified standard, and since a strictly
1337 conforming program cannot contain a '$', we do not condition
1338 their acceptance on the -std= setting. */
1339 cpp_opts
->warn_dollars
= (cpp_opts
->cpp_pedantic
&& !cpp_opts
->c99
);
1341 cb_file_change (parse_in
,
1342 linemap_check_ordinary (linemap_add (line_table
, LC_RENAME
, 0,
1343 _("<command-line>"), 0)));
1345 for (i
= 0; i
< deferred_count
; i
++)
1347 struct deferred_opt
*opt
= &deferred_opts
[i
];
1349 if (opt
->code
== OPT_D
)
1350 cpp_define (parse_in
, opt
->arg
);
1351 else if (opt
->code
== OPT_U
)
1352 cpp_undef (parse_in
, opt
->arg
);
1353 else if (opt
->code
== OPT_A
)
1355 if (opt
->arg
[0] == '-')
1356 cpp_unassert (parse_in
, opt
->arg
+ 1);
1358 cpp_assert (parse_in
, opt
->arg
);
1362 /* Start the main input file, if the debug writer wants it. */
1363 if (debug_hooks
->start_end_main_source_file
1364 && !flag_preprocess_only
)
1365 (*debug_hooks
->start_source_file
) (0, this_input_filename
);
1367 /* Handle -imacros after -D and -U. */
1368 for (i
= 0; i
< deferred_count
; i
++)
1370 struct deferred_opt
*opt
= &deferred_opts
[i
];
1372 if (opt
->code
== OPT_imacros
1373 && cpp_push_include (parse_in
, opt
->arg
))
1375 /* Disable push_command_line_include callback for now. */
1376 include_cursor
= deferred_count
+ 1;
1377 cpp_scan_nooutput (parse_in
);
1383 if (cpp_opts
->directives_only
)
1384 cpp_init_special_builtins (parse_in
);
1386 /* Start the main input file, if the debug writer wants it. */
1387 if (debug_hooks
->start_end_main_source_file
1388 && !flag_preprocess_only
)
1389 (*debug_hooks
->start_source_file
) (0, this_input_filename
);
1393 push_command_line_include ();
1396 /* Give CPP the next file given by -include, if any. */
1398 push_command_line_include (void)
1400 /* This can happen if disabled by -imacros for example.
1401 Punt so that we don't set "<command-line>" as the filename for
1403 if (include_cursor
> deferred_count
)
1406 if (!done_preinclude
)
1408 done_preinclude
= true;
1409 if (flag_hosted
&& std_inc
&& !cpp_opts
->preprocessed
)
1411 const char *preinc
= targetcm
.c_preinclude ();
1412 if (preinc
&& cpp_push_default_include (parse_in
, preinc
))
1417 pch_cpp_save_state ();
1419 while (include_cursor
< deferred_count
)
1421 struct deferred_opt
*opt
= &deferred_opts
[include_cursor
++];
1423 if (!cpp_opts
->preprocessed
&& opt
->code
== OPT_include
1424 && cpp_push_include (parse_in
, opt
->arg
))
1428 if (include_cursor
== deferred_count
)
1431 /* -Wunused-macros should only warn about macros defined hereafter. */
1432 cpp_opts
->warn_unused_macros
= cpp_warn_unused_macros
;
1433 /* Restore the line map from <command line>. */
1434 if (!cpp_opts
->preprocessed
)
1435 cpp_change_file (parse_in
, LC_RENAME
, this_input_filename
);
1437 /* Set this here so the client can change the option if it wishes,
1438 and after stacking the main file so we don't trace the main file. */
1439 line_table
->trace_includes
= cpp_opts
->print_include_names
;
1443 /* File change callback. Has to handle -include files. */
1445 cb_file_change (cpp_reader
* ARG_UNUSED (pfile
),
1446 const line_map_ordinary
*new_map
)
1448 if (flag_preprocess_only
)
1449 pp_file_change (new_map
);
1451 fe_file_change (new_map
);
1454 && (new_map
->reason
== LC_ENTER
|| new_map
->reason
== LC_RENAME
))
1456 /* Signal to plugins that a file is included. This could happen
1457 several times with the same file path, e.g. because of
1458 several '#include' or '#line' directives... */
1459 invoke_plugin_callbacks
1460 (PLUGIN_INCLUDE_FILE
,
1461 const_cast<char*> (ORDINARY_MAP_FILE_NAME (new_map
)));
1464 if (new_map
== 0 || (new_map
->reason
== LC_LEAVE
&& MAIN_FILE_P (new_map
)))
1466 pch_cpp_save_state ();
1467 push_command_line_include ();
1472 cb_dir_change (cpp_reader
* ARG_UNUSED (pfile
), const char *dir
)
1474 if (!set_src_pwd (dir
))
1475 warning (0, "too late for # directive to set debug directory");
1478 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1479 extensions if ISO). There is no concept of gnu94. */
1481 set_std_c89 (int c94
, int iso
)
1483 cpp_set_lang (parse_in
, c94
? CLK_STDC94
: iso
? CLK_STDC89
: CLK_GNUC89
);
1486 flag_no_gnu_keywords
= iso
;
1487 flag_no_nonansi_builtin
= iso
;
1491 lang_hooks
.name
= "GNU C89";
1494 /* Set the C 99 standard (without GNU extensions if ISO). */
1496 set_std_c99 (int iso
)
1498 cpp_set_lang (parse_in
, iso
? CLK_STDC99
: CLK_GNUC99
);
1500 flag_no_nonansi_builtin
= iso
;
1505 lang_hooks
.name
= "GNU C99";
1508 /* Set the C 11 standard (without GNU extensions if ISO). */
1510 set_std_c11 (int iso
)
1512 cpp_set_lang (parse_in
, iso
? CLK_STDC11
: CLK_GNUC11
);
1514 flag_no_nonansi_builtin
= iso
;
1519 lang_hooks
.name
= "GNU C11";
1522 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1524 set_std_cxx98 (int iso
)
1526 cpp_set_lang (parse_in
, iso
? CLK_CXX98
: CLK_GNUCXX
);
1527 flag_no_gnu_keywords
= iso
;
1528 flag_no_nonansi_builtin
= iso
;
1532 cxx_dialect
= cxx98
;
1533 lang_hooks
.name
= "GNU C++98";
1536 /* Set the C++ 2011 standard (without GNU extensions if ISO). */
1538 set_std_cxx11 (int iso
)
1540 cpp_set_lang (parse_in
, iso
? CLK_CXX11
: CLK_GNUCXX11
);
1541 flag_no_gnu_keywords
= iso
;
1542 flag_no_nonansi_builtin
= iso
;
1544 /* C++11 includes the C99 standard library. */
1547 cxx_dialect
= cxx11
;
1548 lang_hooks
.name
= "GNU C++11";
1551 /* Set the C++ 2014 draft standard (without GNU extensions if ISO). */
1553 set_std_cxx14 (int iso
)
1555 cpp_set_lang (parse_in
, iso
? CLK_CXX14
: CLK_GNUCXX14
);
1556 flag_no_gnu_keywords
= iso
;
1557 flag_no_nonansi_builtin
= iso
;
1559 /* C++11 includes the C99 standard library. */
1562 cxx_dialect
= cxx14
;
1563 lang_hooks
.name
= "GNU C++14";
1566 /* Set the C++ 201z draft standard (without GNU extensions if ISO). */
1568 set_std_cxx1z (int iso
)
1570 cpp_set_lang (parse_in
, iso
? CLK_CXX1Z
: CLK_GNUCXX1Z
);
1571 flag_no_gnu_keywords
= iso
;
1572 flag_no_nonansi_builtin
= iso
;
1574 /* C++11 includes the C99 standard library. */
1578 cxx_dialect
= cxx1z
;
1579 lang_hooks
.name
= "GNU C++14"; /* Pretend C++14 till standarization. */
1582 /* Args to -d specify what to dump. Silently ignore
1583 unrecognized options; they may be aimed at toplev.c. */
1585 handle_OPT_d (const char *arg
)
1589 while ((c
= *arg
++) != '\0')
1592 case 'M': /* Dump macros only. */
1593 case 'N': /* Dump names. */
1594 case 'D': /* Dump definitions. */
1595 case 'U': /* Dump used macros. */
1596 flag_dump_macros
= c
;
1600 flag_dump_includes
= 1;