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
);
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 && TARGET_FLT_EVAL_METHOD_NON_DEFAULT
)
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 /* Declone C++ 'structors if -Os. */
875 if (flag_declone_ctor_dtor
== -1)
876 flag_declone_ctor_dtor
= optimize_size
;
878 if (warn_abi_version
== -1)
880 if (flag_abi_compat_version
!= -1)
881 warn_abi_version
= flag_abi_compat_version
;
883 warn_abi_version
= 0;
886 if (flag_abi_compat_version
== 1)
888 warning (0, "%<-fabi-compat-version=1%> is not supported, using =2");
889 flag_abi_compat_version
= 2;
891 else if (flag_abi_compat_version
== -1)
893 /* Generate compatibility aliases for ABI v10 (6.1) by default. */
894 flag_abi_compat_version
895 = (flag_abi_version
== 0 ? 10 : 0);
898 /* Change flag_abi_version to be the actual current ABI level for the
899 benefit of c_cpp_builtins. */
900 if (flag_abi_version
== 0)
901 flag_abi_version
= 11;
903 if (cxx_dialect
>= cxx11
)
905 /* If we're allowing C++0x constructs, don't warn about C++98
906 identifiers which are keywords in C++0x. */
907 warn_cxx11_compat
= 0;
908 cpp_opts
->cpp_warn_cxx11_compat
= 0;
910 if (warn_narrowing
== -1)
913 else if (warn_narrowing
== -1)
916 /* C++17 has stricter evaluation order requirements; let's use some of them
917 for earlier C++ as well, so chaining works as expected. */
919 && flag_strong_eval_order
== -1)
920 flag_strong_eval_order
= (cxx_dialect
>= cxx1z
? 2 : 1);
922 /* Global sized deallocation is new in C++14. */
923 if (flag_sized_deallocation
== -1)
924 flag_sized_deallocation
= (cxx_dialect
>= cxx14
);
926 if (flag_extern_tls_init
)
928 #if !defined (ASM_OUTPUT_DEF) || !SUPPORTS_WEAK
929 /* Lazy TLS initialization for a variable in another TU requires
930 alias and weak reference support. */
931 if (flag_extern_tls_init
> 0)
932 sorry ("external TLS initialization functions not supported "
934 flag_extern_tls_init
= 0;
936 flag_extern_tls_init
= 1;
940 if (flag_preprocess_only
)
942 /* Open the output now. We must do so even if flag_no_output is
943 on, because there may be other output than from the actual
944 preprocessing (e.g. from -dM). */
945 if (out_fname
[0] == '\0')
948 out_stream
= fopen (out_fname
, "w");
950 if (out_stream
== NULL
)
952 fatal_error (input_location
, "opening output file %s: %m", out_fname
);
956 if (num_in_fnames
> 1)
957 error ("too many filenames given. Type %s --help for usage",
960 init_pp_output (out_stream
);
966 /* When writing a PCH file, avoid reading some other PCH file,
967 because the default address space slot then can't be used
968 for the output PCH file. */
971 c_common_no_more_pch ();
972 /* Only -g0 and -gdwarf* are supported with PCH, for other
973 debug formats we warn here and refuse to load any PCH files. */
974 if (write_symbols
!= NO_DEBUG
&& write_symbols
!= DWARF2_DEBUG
)
975 warning (OPT_Wdeprecated
,
976 "the \"%s\" debug format cannot be used with "
977 "pre-compiled headers", debug_type_names
[write_symbols
]);
979 else if (write_symbols
!= NO_DEBUG
&& write_symbols
!= DWARF2_DEBUG
)
980 c_common_no_more_pch ();
982 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
983 input_location
= UNKNOWN_LOCATION
;
986 cb
= cpp_get_callbacks (parse_in
);
987 cb
->file_change
= cb_file_change
;
988 cb
->dir_change
= cb_dir_change
;
989 cpp_post_options (parse_in
);
990 init_global_opts_from_cpp (&global_options
, cpp_get_options (parse_in
));
992 input_location
= UNKNOWN_LOCATION
;
994 *pfilename
= this_input_filename
995 = cpp_read_main_file (parse_in
, in_fnames
[0]);
996 /* Don't do any compilation or preprocessing if there is no input file. */
997 if (this_input_filename
== NULL
)
1003 if (flag_working_directory
1004 && flag_preprocess_only
&& !flag_no_line_commands
)
1005 pp_dir_change (parse_in
, get_src_pwd ());
1007 /* Disable LTO output when outputting a precompiled header. */
1008 if (pch_file
&& flag_lto
)
1011 flag_generate_lto
= 0;
1014 return flag_preprocess_only
;
1017 /* Front end initialization common to C, ObjC and C++. */
1019 c_common_init (void)
1021 /* Set up preprocessor arithmetic. Must be done after call to
1022 c_common_nodes_and_builtins for type nodes to be good. */
1023 cpp_opts
->precision
= TYPE_PRECISION (intmax_type_node
);
1024 cpp_opts
->char_precision
= TYPE_PRECISION (char_type_node
);
1025 cpp_opts
->int_precision
= TYPE_PRECISION (integer_type_node
);
1026 cpp_opts
->wchar_precision
= TYPE_PRECISION (wchar_type_node
);
1027 cpp_opts
->unsigned_wchar
= TYPE_UNSIGNED (wchar_type_node
);
1028 cpp_opts
->bytes_big_endian
= BYTES_BIG_ENDIAN
;
1030 /* This can't happen until after wchar_precision and bytes_big_endian
1032 cpp_init_iconv (parse_in
);
1037 fputs ("Compiler executable checksum: ", stderr
);
1038 for (i
= 0; i
< 16; i
++)
1039 fprintf (stderr
, "%02x", executable_checksum
[i
]);
1040 putc ('\n', stderr
);
1043 /* Has to wait until now so that cpplib has its hash table. */
1046 if (flag_preprocess_only
)
1048 c_finish_options ();
1049 preprocess_file (parse_in
);
1056 /* Initialize the integrated preprocessor after debug output has been
1057 initialized; loop over each input file. */
1059 c_common_parse_file (void)
1066 c_finish_options ();
1067 /* Open the dump files to use for the original and class dump output
1068 here, to be used during parsing for the current file. */
1069 original_dump_file
= dump_begin (TDI_original
, &original_dump_flags
);
1070 class_dump_file
= dump_begin (TDI_class
, &class_dump_flags
);
1075 /* And end the main input file, if the debug writer wants it */
1076 if (debug_hooks
->start_end_main_source_file
)
1077 (*debug_hooks
->end_source_file
) (0);
1078 if (++i
>= num_in_fnames
)
1080 cpp_undef_all (parse_in
);
1081 cpp_clear_file_cache (parse_in
);
1083 = cpp_read_main_file (parse_in
, in_fnames
[i
]);
1084 if (original_dump_file
)
1086 dump_end (TDI_original
, original_dump_file
);
1087 original_dump_file
= NULL
;
1089 if (class_dump_file
)
1091 dump_end (TDI_class
, class_dump_file
);
1092 class_dump_file
= NULL
;
1094 /* If an input file is missing, abandon further compilation.
1095 cpplib has issued a diagnostic. */
1096 if (!this_input_filename
)
1100 c_parse_final_cleanups ();
1103 /* Returns the appropriate dump file for PHASE to dump with FLAGS. */
1105 get_dump_info (int phase
, int *flags
)
1107 gcc_assert (phase
== TDI_original
|| phase
== TDI_class
);
1108 if (phase
== TDI_original
)
1110 *flags
= original_dump_flags
;
1111 return original_dump_file
;
1115 *flags
= class_dump_flags
;
1116 return class_dump_file
;
1120 /* Common finish hook for the C, ObjC and C++ front ends. */
1122 c_common_finish (void)
1124 FILE *deps_stream
= NULL
;
1126 /* Don't write the deps file if there are errors. */
1127 if (cpp_opts
->deps
.style
!= DEPS_NONE
&& !seen_error ())
1129 /* If -M or -MM was seen without -MF, default output to the
1132 deps_stream
= out_stream
;
1135 deps_stream
= fopen (deps_file
, deps_append
? "a": "w");
1137 fatal_error (input_location
, "opening dependency file %s: %m",
1142 /* For performance, avoid tearing down cpplib's internal structures
1143 with cpp_destroy (). */
1144 cpp_finish (parse_in
, deps_stream
);
1146 if (deps_stream
&& deps_stream
!= out_stream
1147 && (ferror (deps_stream
) || fclose (deps_stream
)))
1148 fatal_error (input_location
, "closing dependency file %s: %m", deps_file
);
1150 if (out_stream
&& (ferror (out_stream
) || fclose (out_stream
)))
1151 fatal_error (input_location
, "when writing output to %s: %m", out_fname
);
1154 /* Either of two environment variables can specify output of
1155 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1156 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1157 and DEPS_TARGET is the target to mention in the deps. They also
1158 result in dependency information being appended to the output file
1159 rather than overwriting it, and like Sun's compiler
1160 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1162 check_deps_environment_vars (void)
1166 spec
= getenv ("DEPENDENCIES_OUTPUT");
1168 cpp_opts
->deps
.style
= DEPS_USER
;
1171 spec
= getenv ("SUNPRO_DEPENDENCIES");
1174 cpp_opts
->deps
.style
= DEPS_SYSTEM
;
1175 cpp_opts
->deps
.ignore_main_file
= true;
1181 /* Find the space before the DEPS_TARGET, if there is one. */
1182 char *s
= strchr (spec
, ' ');
1185 /* Let the caller perform MAKE quoting. */
1186 defer_opt (OPT_MT
, s
+ 1);
1190 /* Command line -MF overrides environment variables and default. */
1199 /* Handle deferred command line switches. */
1201 handle_deferred_opts (void)
1206 /* Avoid allocating the deps buffer if we don't need it.
1207 (This flag may be true without there having been -MT or -MQ
1208 options, but we'll still need the deps buffer.) */
1212 deps
= cpp_get_deps (parse_in
);
1214 for (i
= 0; i
< deferred_count
; i
++)
1216 struct deferred_opt
*opt
= &deferred_opts
[i
];
1218 if (opt
->code
== OPT_MT
|| opt
->code
== OPT_MQ
)
1219 deps_add_target (deps
, opt
->arg
, opt
->code
== OPT_MQ
);
1223 /* These settings are appropriate for GCC, but not necessarily so for
1224 cpplib as a library. */
1226 sanitize_cpp_opts (void)
1228 /* If we don't know what style of dependencies to output, complain
1229 if any other dependency switches have been given. */
1230 if (deps_seen
&& cpp_opts
->deps
.style
== DEPS_NONE
)
1231 error ("to generate dependencies you must specify either -M or -MM");
1233 /* -dM and dependencies suppress normal output; do it here so that
1234 the last -d[MDN] switch overrides earlier ones. */
1235 if (flag_dump_macros
== 'M')
1238 /* By default, -fdirectives-only implies -dD. This allows subsequent phases
1239 to perform proper macro expansion. */
1240 if (cpp_opts
->directives_only
&& !cpp_opts
->preprocessed
&& !flag_dump_macros
)
1241 flag_dump_macros
= 'D';
1243 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1244 -dM since at least glibc relies on -M -dM to work. */
1245 /* Also, flag_no_output implies flag_no_line_commands, always. */
1248 if (flag_dump_macros
!= 'M')
1249 flag_dump_macros
= 0;
1250 flag_dump_includes
= 0;
1251 flag_no_line_commands
= 1;
1253 else if (cpp_opts
->deps
.missing_files
)
1254 error ("-MG may only be used with -M or -MM");
1256 cpp_opts
->unsigned_char
= !flag_signed_char
;
1257 cpp_opts
->stdc_0_in_system_headers
= STDC_0_IN_SYSTEM_HEADERS
;
1259 /* Wlong-long is disabled by default. It is enabled by:
1260 [-Wpedantic | -Wtraditional] -std=[gnu|c]++98 ; or
1261 [-Wpedantic | -Wtraditional] -std=non-c99
1263 Either -Wlong-long or -Wno-long-long override any other settings.
1264 ??? These conditions should be handled in c.opt. */
1265 if (warn_long_long
== -1)
1267 warn_long_long
= ((pedantic
|| warn_traditional
)
1268 && (c_dialect_cxx () ? cxx_dialect
== cxx98
: !flag_isoc99
));
1269 cpp_opts
->cpp_warn_long_long
= warn_long_long
;
1272 /* If we're generating preprocessor output, emit current directory
1273 if explicitly requested or if debugging information is enabled.
1274 ??? Maybe we should only do it for debugging formats that
1275 actually output the current directory? */
1276 if (flag_working_directory
== -1)
1277 flag_working_directory
= (debug_info_level
!= DINFO_LEVEL_NONE
);
1279 if (cpp_opts
->directives_only
)
1281 if (cpp_warn_unused_macros
)
1282 error ("-fdirectives-only is incompatible with -Wunused_macros");
1283 if (cpp_opts
->traditional
)
1284 error ("-fdirectives-only is incompatible with -traditional");
1288 /* Add include path with a prefix at the front of its name. */
1290 add_prefixed_path (const char *suffix
, size_t chain
)
1294 size_t prefix_len
, suffix_len
;
1296 suffix_len
= strlen (suffix
);
1297 prefix
= iprefix
? iprefix
: cpp_GCC_INCLUDE_DIR
;
1298 prefix_len
= iprefix
? strlen (iprefix
) : cpp_GCC_INCLUDE_DIR_len
;
1300 path
= (char *) xmalloc (prefix_len
+ suffix_len
+ 1);
1301 memcpy (path
, prefix
, prefix_len
);
1302 memcpy (path
+ prefix_len
, suffix
, suffix_len
);
1303 path
[prefix_len
+ suffix_len
] = '\0';
1305 add_path (path
, chain
, 0, false);
1308 /* Handle -D, -U, -A, -imacros, and the first -include. */
1310 c_finish_options (void)
1312 if (!cpp_opts
->preprocessed
)
1316 cb_file_change (parse_in
,
1317 linemap_check_ordinary (linemap_add (line_table
,
1321 /* Make sure all of the builtins about to be declared have
1322 BUILTINS_LOCATION has their source_location. */
1323 source_location builtins_loc
= BUILTINS_LOCATION
;
1324 cpp_force_token_locations (parse_in
, &builtins_loc
);
1326 cpp_init_builtins (parse_in
, flag_hosted
);
1327 c_cpp_builtins (parse_in
);
1329 cpp_stop_forcing_token_locations (parse_in
);
1331 /* We're about to send user input to cpplib, so make it warn for
1332 things that we previously (when we sent it internal definitions)
1333 told it to not warn.
1335 C99 permits implementation-defined characters in identifiers.
1336 The documented meaning of -std= is to turn off extensions that
1337 conflict with the specified standard, and since a strictly
1338 conforming program cannot contain a '$', we do not condition
1339 their acceptance on the -std= setting. */
1340 cpp_opts
->warn_dollars
= (cpp_opts
->cpp_pedantic
&& !cpp_opts
->c99
);
1342 cb_file_change (parse_in
,
1343 linemap_check_ordinary (linemap_add (line_table
, LC_RENAME
, 0,
1344 _("<command-line>"), 0)));
1346 for (i
= 0; i
< deferred_count
; i
++)
1348 struct deferred_opt
*opt
= &deferred_opts
[i
];
1350 if (opt
->code
== OPT_D
)
1351 cpp_define (parse_in
, opt
->arg
);
1352 else if (opt
->code
== OPT_U
)
1353 cpp_undef (parse_in
, opt
->arg
);
1354 else if (opt
->code
== OPT_A
)
1356 if (opt
->arg
[0] == '-')
1357 cpp_unassert (parse_in
, opt
->arg
+ 1);
1359 cpp_assert (parse_in
, opt
->arg
);
1363 /* Start the main input file, if the debug writer wants it. */
1364 if (debug_hooks
->start_end_main_source_file
1365 && !flag_preprocess_only
)
1366 (*debug_hooks
->start_source_file
) (0, this_input_filename
);
1368 /* Handle -imacros after -D and -U. */
1369 for (i
= 0; i
< deferred_count
; i
++)
1371 struct deferred_opt
*opt
= &deferred_opts
[i
];
1373 if (opt
->code
== OPT_imacros
1374 && cpp_push_include (parse_in
, opt
->arg
))
1376 /* Disable push_command_line_include callback for now. */
1377 include_cursor
= deferred_count
+ 1;
1378 cpp_scan_nooutput (parse_in
);
1384 if (cpp_opts
->directives_only
)
1385 cpp_init_special_builtins (parse_in
);
1387 /* Start the main input file, if the debug writer wants it. */
1388 if (debug_hooks
->start_end_main_source_file
1389 && !flag_preprocess_only
)
1390 (*debug_hooks
->start_source_file
) (0, this_input_filename
);
1394 push_command_line_include ();
1397 /* Give CPP the next file given by -include, if any. */
1399 push_command_line_include (void)
1401 /* This can happen if disabled by -imacros for example.
1402 Punt so that we don't set "<command-line>" as the filename for
1404 if (include_cursor
> deferred_count
)
1407 if (!done_preinclude
)
1409 done_preinclude
= true;
1410 if (flag_hosted
&& std_inc
&& !cpp_opts
->preprocessed
)
1412 const char *preinc
= targetcm
.c_preinclude ();
1413 if (preinc
&& cpp_push_default_include (parse_in
, preinc
))
1418 pch_cpp_save_state ();
1420 while (include_cursor
< deferred_count
)
1422 struct deferred_opt
*opt
= &deferred_opts
[include_cursor
++];
1424 if (!cpp_opts
->preprocessed
&& opt
->code
== OPT_include
1425 && cpp_push_include (parse_in
, opt
->arg
))
1429 if (include_cursor
== deferred_count
)
1432 /* -Wunused-macros should only warn about macros defined hereafter. */
1433 cpp_opts
->warn_unused_macros
= cpp_warn_unused_macros
;
1434 /* Restore the line map from <command line>. */
1435 if (!cpp_opts
->preprocessed
)
1436 cpp_change_file (parse_in
, LC_RENAME
, this_input_filename
);
1438 /* Set this here so the client can change the option if it wishes,
1439 and after stacking the main file so we don't trace the main file. */
1440 line_table
->trace_includes
= cpp_opts
->print_include_names
;
1444 /* File change callback. Has to handle -include files. */
1446 cb_file_change (cpp_reader
* ARG_UNUSED (pfile
),
1447 const line_map_ordinary
*new_map
)
1449 if (flag_preprocess_only
)
1450 pp_file_change (new_map
);
1452 fe_file_change (new_map
);
1455 && (new_map
->reason
== LC_ENTER
|| new_map
->reason
== LC_RENAME
))
1457 /* Signal to plugins that a file is included. This could happen
1458 several times with the same file path, e.g. because of
1459 several '#include' or '#line' directives... */
1460 invoke_plugin_callbacks
1461 (PLUGIN_INCLUDE_FILE
,
1462 const_cast<char*> (ORDINARY_MAP_FILE_NAME (new_map
)));
1465 if (new_map
== 0 || (new_map
->reason
== LC_LEAVE
&& MAIN_FILE_P (new_map
)))
1467 pch_cpp_save_state ();
1468 push_command_line_include ();
1473 cb_dir_change (cpp_reader
* ARG_UNUSED (pfile
), const char *dir
)
1475 if (!set_src_pwd (dir
))
1476 warning (0, "too late for # directive to set debug directory");
1479 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1480 extensions if ISO). There is no concept of gnu94. */
1482 set_std_c89 (int c94
, int iso
)
1484 cpp_set_lang (parse_in
, c94
? CLK_STDC94
: iso
? CLK_STDC89
: CLK_GNUC89
);
1487 flag_no_gnu_keywords
= iso
;
1488 flag_no_nonansi_builtin
= iso
;
1492 lang_hooks
.name
= "GNU C89";
1495 /* Set the C 99 standard (without GNU extensions if ISO). */
1497 set_std_c99 (int iso
)
1499 cpp_set_lang (parse_in
, iso
? CLK_STDC99
: CLK_GNUC99
);
1501 flag_no_nonansi_builtin
= iso
;
1506 lang_hooks
.name
= "GNU C99";
1509 /* Set the C 11 standard (without GNU extensions if ISO). */
1511 set_std_c11 (int iso
)
1513 cpp_set_lang (parse_in
, iso
? CLK_STDC11
: CLK_GNUC11
);
1515 flag_no_nonansi_builtin
= iso
;
1520 lang_hooks
.name
= "GNU C11";
1523 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1525 set_std_cxx98 (int iso
)
1527 cpp_set_lang (parse_in
, iso
? CLK_CXX98
: CLK_GNUCXX
);
1528 flag_no_gnu_keywords
= iso
;
1529 flag_no_nonansi_builtin
= iso
;
1533 cxx_dialect
= cxx98
;
1534 lang_hooks
.name
= "GNU C++98";
1537 /* Set the C++ 2011 standard (without GNU extensions if ISO). */
1539 set_std_cxx11 (int iso
)
1541 cpp_set_lang (parse_in
, iso
? CLK_CXX11
: CLK_GNUCXX11
);
1542 flag_no_gnu_keywords
= iso
;
1543 flag_no_nonansi_builtin
= iso
;
1545 /* C++11 includes the C99 standard library. */
1548 cxx_dialect
= cxx11
;
1549 lang_hooks
.name
= "GNU C++11";
1552 /* Set the C++ 2014 draft standard (without GNU extensions if ISO). */
1554 set_std_cxx14 (int iso
)
1556 cpp_set_lang (parse_in
, iso
? CLK_CXX14
: CLK_GNUCXX14
);
1557 flag_no_gnu_keywords
= iso
;
1558 flag_no_nonansi_builtin
= iso
;
1560 /* C++11 includes the C99 standard library. */
1563 cxx_dialect
= cxx14
;
1564 lang_hooks
.name
= "GNU C++14";
1567 /* Set the C++ 201z draft standard (without GNU extensions if ISO). */
1569 set_std_cxx1z (int iso
)
1571 cpp_set_lang (parse_in
, iso
? CLK_CXX1Z
: CLK_GNUCXX1Z
);
1572 flag_no_gnu_keywords
= iso
;
1573 flag_no_nonansi_builtin
= iso
;
1575 /* C++11 includes the C99 standard library. */
1579 cxx_dialect
= cxx1z
;
1580 lang_hooks
.name
= "GNU C++14"; /* Pretend C++14 till standarization. */
1583 /* Args to -d specify what to dump. Silently ignore
1584 unrecognized options; they may be aimed at toplev.c. */
1586 handle_OPT_d (const char *arg
)
1590 while ((c
= *arg
++) != '\0')
1593 case 'M': /* Dump macros only. */
1594 case 'N': /* Dump names. */
1595 case 'D': /* Dump definitions. */
1596 case 'U': /* Dump used macros. */
1597 flag_dump_macros
= c
;
1601 flag_dump_includes
= 1;