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_Walloca_larger_than_
:
385 inform (loc
, "-Walloca-larger-than=0 is meaningless");
388 case OPT_Wvla_larger_than_
:
390 inform (loc
, "-Wvla-larger-than=0 is meaningless");
393 case OPT_Wunknown_pragmas
:
394 /* Set to greater than 1, so that even unknown pragmas in
395 system headers will be warned about. */
396 /* ??? There is no way to handle this automatically for now. */
397 warn_unknown_pragmas
= value
* 2;
401 if (!c_dialect_cxx ())
402 set_std_c89 (false, true);
404 set_std_cxx98 (true);
415 warning (0, "%<-Wabi=1%> is not supported, using =2");
418 warn_abi_version
= value
;
419 if (flag_abi_compat_version
== -1)
420 flag_abi_compat_version
= value
;
423 case OPT_fcanonical_system_headers
:
424 cpp_opts
->canonical_system_headers
= value
;
427 case OPT_fcond_mismatch
:
428 if (!c_dialect_cxx ())
430 flag_cond_mismatch
= value
;
433 warning (0, "switch %qs is no longer supported", option
->opt_text
);
440 disable_builtin_function (arg
);
443 case OPT_fdirectives_only
:
444 cpp_opts
->directives_only
= value
;
447 case OPT_fdollars_in_identifiers
:
448 cpp_opts
->dollars_in_ident
= value
;
451 case OPT_ffreestanding
:
456 flag_no_builtin
= !value
;
459 case OPT_fconstant_string_class_
:
460 constant_string_class_name
= arg
;
463 case OPT_fextended_identifiers
:
464 cpp_opts
->extended_identifiers
= value
;
467 case OPT_foperator_names
:
468 cpp_opts
->operator_names
= value
;
472 cpp_opts
->restore_pch_deps
= value
;
475 case OPT_fpch_preprocess
:
476 flag_pch_preprocess
= value
;
479 case OPT_fpermissive
:
480 flag_permissive
= value
;
481 global_dc
->permissive
= value
;
484 case OPT_fpreprocessed
:
485 cpp_opts
->preprocessed
= value
;
492 case OPT_ftrack_macro_expansion
:
497 case OPT_ftrack_macro_expansion_
:
498 if (arg
&& *arg
!= '\0')
499 cpp_opts
->track_macro_expansion
= value
;
501 cpp_opts
->track_macro_expansion
= 2;
505 flag_use_repository
= value
;
507 flag_implicit_templates
= 0;
511 /* It is documented that we silently ignore silly values. */
512 if (value
>= 1 && value
<= 100)
513 cpp_opts
->tabstop
= value
;
516 case OPT_fexec_charset_
:
517 cpp_opts
->narrow_charset
= arg
;
520 case OPT_fwide_exec_charset_
:
521 cpp_opts
->wide_charset
= arg
;
524 case OPT_finput_charset_
:
525 cpp_opts
->input_charset
= arg
;
528 case OPT_ftemplate_depth_
:
529 max_tinst_depth
= value
;
532 case OPT_fvisibility_inlines_hidden
:
533 visibility_options
.inlines_hidden
= value
;
536 case OPT_femit_struct_debug_baseonly
:
537 set_struct_debug_option (&global_options
, loc
, "base");
540 case OPT_femit_struct_debug_reduced
:
541 set_struct_debug_option (&global_options
, loc
,
542 "dir:ord:sys,dir:gen:any,ind:base");
545 case OPT_femit_struct_debug_detailed_
:
546 set_struct_debug_option (&global_options
, loc
, arg
);
549 case OPT_fext_numeric_literals
:
550 cpp_opts
->ext_numeric_literals
= value
;
554 add_path (xstrdup (arg
), AFTER
, 0, true);
559 defer_opt (code
, arg
);
571 add_path (xstrdup (arg
), QUOTE
, 0, true);
579 add_path (xstrdup (arg
), SYSTEM
, 0, true);
582 case OPT_iwithprefix
:
583 add_prefixed_path (arg
, SYSTEM
);
586 case OPT_iwithprefixbefore
:
587 add_prefixed_path (arg
, BRACKET
);
591 cpp_set_lang (parse_in
, CLK_ASM
);
592 cpp_opts
->dollars_in_ident
= false;
607 error ("output filename specified twice");
610 case OPT_print_objc_runtime_info
:
611 print_struct_values
= 1;
619 case OPT_std_gnu__98
:
620 if (!preprocessing_asm_p
)
621 set_std_cxx98 (code
== OPT_std_c__98
/* ISO */);
625 case OPT_std_gnu__11
:
626 if (!preprocessing_asm_p
)
627 set_std_cxx11 (code
== OPT_std_c__11
/* ISO */);
631 case OPT_std_gnu__14
:
632 if (!preprocessing_asm_p
)
633 set_std_cxx14 (code
== OPT_std_c__14
/* ISO */);
637 case OPT_std_gnu__1z
:
638 if (!preprocessing_asm_p
)
639 set_std_cxx1z (code
== OPT_std_c__1z
/* ISO */);
643 case OPT_std_iso9899_199409
:
644 if (!preprocessing_asm_p
)
645 set_std_c89 (code
== OPT_std_iso9899_199409
/* c94 */, true /* ISO */);
649 if (!preprocessing_asm_p
)
650 set_std_c89 (false /* c94 */, false /* ISO */);
654 if (!preprocessing_asm_p
)
655 set_std_c99 (true /* ISO */);
659 if (!preprocessing_asm_p
)
660 set_std_c99 (false /* ISO */);
664 if (!preprocessing_asm_p
)
665 set_std_c11 (true /* ISO */);
669 if (!preprocessing_asm_p
)
670 set_std_c11 (false /* ISO */);
674 cpp_opts
->trigraphs
= 1;
677 case OPT_traditional_cpp
:
678 cpp_opts
->traditional
= 1;
689 C_handle_option_auto (&global_options
, &global_options_set
,
691 c_family_lang_mask
, kind
,
692 loc
, handlers
, global_dc
);
696 ObjC_handle_option_auto (&global_options
, &global_options_set
,
698 c_family_lang_mask
, kind
,
699 loc
, handlers
, global_dc
);
703 CXX_handle_option_auto (&global_options
, &global_options_set
,
705 c_family_lang_mask
, kind
,
706 loc
, handlers
, global_dc
);
710 ObjCXX_handle_option_auto (&global_options
, &global_options_set
,
712 c_family_lang_mask
, kind
,
713 loc
, handlers
, global_dc
);
720 cpp_handle_option_auto (&global_options
, scode
, cpp_opts
);
724 /* Default implementation of TARGET_HANDLE_C_OPTION. */
727 default_handle_c_option (size_t code ATTRIBUTE_UNUSED
,
728 const char *arg ATTRIBUTE_UNUSED
,
729 int value ATTRIBUTE_UNUSED
)
734 /* Post-switch processing. */
736 c_common_post_options (const char **pfilename
)
738 struct cpp_callbacks
*cb
;
740 /* Canonicalize the input and output filenames. */
741 if (in_fnames
== NULL
)
743 in_fnames
= XNEWVEC (const char *, 1);
746 else if (strcmp (in_fnames
[0], "-") == 0)
749 if (out_fname
== NULL
|| !strcmp (out_fname
, "-"))
752 if (cpp_opts
->deps
.style
== DEPS_NONE
)
753 check_deps_environment_vars ();
755 handle_deferred_opts ();
757 sanitize_cpp_opts ();
759 register_include_chains (parse_in
, sysroot
, iprefix
, imultilib
,
760 std_inc
, std_cxx_inc
&& c_dialect_cxx (), verbose
);
762 #ifdef C_COMMON_OVERRIDE_OPTIONS
763 /* Some machines may reject certain combinations of C
764 language-specific options. */
765 C_COMMON_OVERRIDE_OPTIONS
;
768 /* Excess precision other than "fast" requires front-end
770 if (c_dialect_cxx ())
772 if (flag_excess_precision_cmdline
== EXCESS_PRECISION_STANDARD
)
773 sorry ("-fexcess-precision=standard for C++");
774 flag_excess_precision_cmdline
= EXCESS_PRECISION_FAST
;
776 else if (flag_excess_precision_cmdline
== EXCESS_PRECISION_DEFAULT
)
777 flag_excess_precision_cmdline
= (flag_iso
778 ? EXCESS_PRECISION_STANDARD
779 : EXCESS_PRECISION_FAST
);
781 /* ISO C restricts floating-point expression contraction to within
782 source-language expressions (-ffp-contract=on, currently an alias
783 for -ffp-contract=off). */
786 && (global_options_set
.x_flag_fp_contract_mode
787 == (enum fp_contract_mode
) 0)
788 && flag_unsafe_math_optimizations
== 0)
789 flag_fp_contract_mode
= FP_CONTRACT_OFF
;
791 /* By default we use C99 inline semantics in GNU99 or C99 mode. C99
792 inline semantics are not supported in GNU89 or C89 mode. */
793 if (flag_gnu89_inline
== -1)
794 flag_gnu89_inline
= !flag_isoc99
;
795 else if (!flag_gnu89_inline
&& !flag_isoc99
)
796 error ("-fno-gnu89-inline is only supported in GNU99 or C99 mode");
798 /* Default to ObjC sjlj exception handling if NeXT runtime. */
799 if (flag_objc_sjlj_exceptions
< 0)
800 flag_objc_sjlj_exceptions
= flag_next_runtime
;
801 if (flag_objc_exceptions
&& !flag_objc_sjlj_exceptions
)
804 /* If -ffreestanding, -fno-hosted or -fno-builtin then disable
805 pattern recognition. */
806 if (!global_options_set
.x_flag_tree_loop_distribute_patterns
808 flag_tree_loop_distribute_patterns
= 0;
810 /* -Woverlength-strings is off by default, but is enabled by -Wpedantic.
811 It is never enabled in C++, as the minimum limit is not normative
813 if (c_dialect_cxx ())
814 warn_overlength_strings
= 0;
816 /* Wmain is enabled by default in C++ but not in C. */
817 /* Wmain is disabled by default for -ffreestanding (!flag_hosted),
818 even if -Wall or -Wpedantic was given (warn_main will be 2 if set
819 by -Wall, 1 if set by -Wmain). */
821 warn_main
= (c_dialect_cxx () && flag_hosted
) ? 1 : 0;
822 else if (warn_main
== 2)
823 warn_main
= flag_hosted
? 1 : 0;
825 /* In C, -Wall and -Wc++-compat enable -Wenum-compare; if it has not
826 yet been set, it is disabled by default. In C++, it is enabled
828 if (warn_enum_compare
== -1)
829 warn_enum_compare
= c_dialect_cxx () ? 1 : 0;
831 /* -Wpacked-bitfield-compat is on by default for the C languages. The
832 warning is issued in stor-layout.c which is not part of the front-end so
833 we need to selectively turn it on here. */
834 if (warn_packed_bitfield_compat
== -1)
835 warn_packed_bitfield_compat
= 1;
837 /* Special format checking options don't work without -Wformat; warn if
841 warning (OPT_Wformat_y2k
,
842 "-Wformat-y2k ignored without -Wformat");
843 warning (OPT_Wformat_extra_args
,
844 "-Wformat-extra-args ignored without -Wformat");
845 warning (OPT_Wformat_zero_length
,
846 "-Wformat-zero-length ignored without -Wformat");
847 warning (OPT_Wformat_nonliteral
,
848 "-Wformat-nonliteral ignored without -Wformat");
849 warning (OPT_Wformat_contains_nul
,
850 "-Wformat-contains-nul ignored without -Wformat");
851 warning (OPT_Wformat_security
,
852 "-Wformat-security ignored without -Wformat");
855 /* -Wimplicit-function-declaration is enabled by default for C99. */
856 if (warn_implicit_function_declaration
== -1)
857 warn_implicit_function_declaration
= flag_isoc99
;
859 /* -Wimplicit-int is enabled by default for C99. */
860 if (warn_implicit_int
== -1)
861 warn_implicit_int
= flag_isoc99
;
863 /* -Wshift-overflow is enabled by default in C99 and C++11 modes. */
864 if (warn_shift_overflow
== -1)
865 warn_shift_overflow
= cxx_dialect
>= cxx11
|| flag_isoc99
;
867 /* -Wshift-negative-value is enabled by -Wextra in C99 and C++11 modes. */
868 if (warn_shift_negative_value
== -1)
869 warn_shift_negative_value
= (extra_warnings
870 && (cxx_dialect
>= cxx11
|| flag_isoc99
));
872 /* -Wregister is enabled by default in C++17. */
873 if (!global_options_set
.x_warn_register
)
874 warn_register
= cxx_dialect
>= cxx1z
;
876 /* Declone C++ 'structors if -Os. */
877 if (flag_declone_ctor_dtor
== -1)
878 flag_declone_ctor_dtor
= optimize_size
;
880 if (warn_abi_version
== -1)
882 if (flag_abi_compat_version
!= -1)
883 warn_abi_version
= flag_abi_compat_version
;
885 warn_abi_version
= 0;
888 if (flag_abi_compat_version
== 1)
890 warning (0, "%<-fabi-compat-version=1%> is not supported, using =2");
891 flag_abi_compat_version
= 2;
893 else if (flag_abi_compat_version
== -1)
895 /* Generate compatibility aliases for ABI v10 (6.1) by default. */
896 flag_abi_compat_version
897 = (flag_abi_version
== 0 ? 10 : 0);
900 /* Change flag_abi_version to be the actual current ABI level for the
901 benefit of c_cpp_builtins. */
902 if (flag_abi_version
== 0)
903 flag_abi_version
= 11;
905 if (cxx_dialect
>= cxx11
)
907 /* If we're allowing C++0x constructs, don't warn about C++98
908 identifiers which are keywords in C++0x. */
909 warn_cxx11_compat
= 0;
910 cpp_opts
->cpp_warn_cxx11_compat
= 0;
912 if (warn_narrowing
== -1)
915 /* Unless -f{,no-}ext-numeric-literals has been used explicitly,
916 for -std=c++{11,14,1z} default to -fno-ext-numeric-literals. */
917 if (flag_iso
&& !global_options_set
.x_flag_ext_numeric_literals
)
918 cpp_opts
->ext_numeric_literals
= 0;
920 else if (warn_narrowing
== -1)
923 /* C++17 has stricter evaluation order requirements; let's use some of them
924 for earlier C++ as well, so chaining works as expected. */
926 && flag_strong_eval_order
== -1)
927 flag_strong_eval_order
= (cxx_dialect
>= cxx1z
? 2 : 1);
929 /* Global sized deallocation is new in C++14. */
930 if (flag_sized_deallocation
== -1)
931 flag_sized_deallocation
= (cxx_dialect
>= cxx14
);
933 if (flag_extern_tls_init
)
935 #if !defined (ASM_OUTPUT_DEF) || !SUPPORTS_WEAK
936 /* Lazy TLS initialization for a variable in another TU requires
937 alias and weak reference support. */
938 if (flag_extern_tls_init
> 0)
939 sorry ("external TLS initialization functions not supported "
941 flag_extern_tls_init
= 0;
943 flag_extern_tls_init
= 1;
947 if (flag_preprocess_only
)
949 /* Open the output now. We must do so even if flag_no_output is
950 on, because there may be other output than from the actual
951 preprocessing (e.g. from -dM). */
952 if (out_fname
[0] == '\0')
955 out_stream
= fopen (out_fname
, "w");
957 if (out_stream
== NULL
)
959 fatal_error (input_location
, "opening output file %s: %m", out_fname
);
963 if (num_in_fnames
> 1)
964 error ("too many filenames given. Type %s --help for usage",
967 init_pp_output (out_stream
);
973 /* When writing a PCH file, avoid reading some other PCH file,
974 because the default address space slot then can't be used
975 for the output PCH file. */
978 c_common_no_more_pch ();
979 /* Only -g0 and -gdwarf* are supported with PCH, for other
980 debug formats we warn here and refuse to load any PCH files. */
981 if (write_symbols
!= NO_DEBUG
&& write_symbols
!= DWARF2_DEBUG
)
982 warning (OPT_Wdeprecated
,
983 "the \"%s\" debug format cannot be used with "
984 "pre-compiled headers", debug_type_names
[write_symbols
]);
986 else if (write_symbols
!= NO_DEBUG
&& write_symbols
!= DWARF2_DEBUG
)
987 c_common_no_more_pch ();
989 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
990 input_location
= UNKNOWN_LOCATION
;
993 cb
= cpp_get_callbacks (parse_in
);
994 cb
->file_change
= cb_file_change
;
995 cb
->dir_change
= cb_dir_change
;
996 cpp_post_options (parse_in
);
997 init_global_opts_from_cpp (&global_options
, cpp_get_options (parse_in
));
999 input_location
= UNKNOWN_LOCATION
;
1001 *pfilename
= this_input_filename
1002 = cpp_read_main_file (parse_in
, in_fnames
[0]);
1003 /* Don't do any compilation or preprocessing if there is no input file. */
1004 if (this_input_filename
== NULL
)
1010 if (flag_working_directory
1011 && flag_preprocess_only
&& !flag_no_line_commands
)
1012 pp_dir_change (parse_in
, get_src_pwd ());
1014 /* Disable LTO output when outputting a precompiled header. */
1015 if (pch_file
&& flag_lto
)
1018 flag_generate_lto
= 0;
1021 return flag_preprocess_only
;
1024 /* Front end initialization common to C, ObjC and C++. */
1026 c_common_init (void)
1028 /* Set up preprocessor arithmetic. Must be done after call to
1029 c_common_nodes_and_builtins for type nodes to be good. */
1030 cpp_opts
->precision
= TYPE_PRECISION (intmax_type_node
);
1031 cpp_opts
->char_precision
= TYPE_PRECISION (char_type_node
);
1032 cpp_opts
->int_precision
= TYPE_PRECISION (integer_type_node
);
1033 cpp_opts
->wchar_precision
= TYPE_PRECISION (wchar_type_node
);
1034 cpp_opts
->unsigned_wchar
= TYPE_UNSIGNED (wchar_type_node
);
1035 cpp_opts
->bytes_big_endian
= BYTES_BIG_ENDIAN
;
1037 /* This can't happen until after wchar_precision and bytes_big_endian
1039 cpp_init_iconv (parse_in
);
1044 fputs ("Compiler executable checksum: ", stderr
);
1045 for (i
= 0; i
< 16; i
++)
1046 fprintf (stderr
, "%02x", executable_checksum
[i
]);
1047 putc ('\n', stderr
);
1050 /* Has to wait until now so that cpplib has its hash table. */
1053 if (flag_preprocess_only
)
1055 c_finish_options ();
1056 preprocess_file (parse_in
);
1063 /* Initialize the integrated preprocessor after debug output has been
1064 initialized; loop over each input file. */
1066 c_common_parse_file (void)
1073 c_finish_options ();
1074 /* Open the dump files to use for the original and class dump output
1075 here, to be used during parsing for the current file. */
1076 original_dump_file
= dump_begin (TDI_original
, &original_dump_flags
);
1077 class_dump_file
= dump_begin (TDI_class
, &class_dump_flags
);
1082 /* And end the main input file, if the debug writer wants it */
1083 if (debug_hooks
->start_end_main_source_file
)
1084 (*debug_hooks
->end_source_file
) (0);
1085 if (++i
>= num_in_fnames
)
1087 cpp_undef_all (parse_in
);
1088 cpp_clear_file_cache (parse_in
);
1090 = cpp_read_main_file (parse_in
, in_fnames
[i
]);
1091 if (original_dump_file
)
1093 dump_end (TDI_original
, original_dump_file
);
1094 original_dump_file
= NULL
;
1096 if (class_dump_file
)
1098 dump_end (TDI_class
, class_dump_file
);
1099 class_dump_file
= NULL
;
1101 /* If an input file is missing, abandon further compilation.
1102 cpplib has issued a diagnostic. */
1103 if (!this_input_filename
)
1107 c_parse_final_cleanups ();
1110 /* Returns the appropriate dump file for PHASE to dump with FLAGS. */
1112 get_dump_info (int phase
, int *flags
)
1114 gcc_assert (phase
== TDI_original
|| phase
== TDI_class
);
1115 if (phase
== TDI_original
)
1117 *flags
= original_dump_flags
;
1118 return original_dump_file
;
1122 *flags
= class_dump_flags
;
1123 return class_dump_file
;
1127 /* Common finish hook for the C, ObjC and C++ front ends. */
1129 c_common_finish (void)
1131 FILE *deps_stream
= NULL
;
1133 /* Don't write the deps file if there are errors. */
1134 if (cpp_opts
->deps
.style
!= DEPS_NONE
&& !seen_error ())
1136 /* If -M or -MM was seen without -MF, default output to the
1139 deps_stream
= out_stream
;
1142 deps_stream
= fopen (deps_file
, deps_append
? "a": "w");
1144 fatal_error (input_location
, "opening dependency file %s: %m",
1149 /* For performance, avoid tearing down cpplib's internal structures
1150 with cpp_destroy (). */
1151 cpp_finish (parse_in
, deps_stream
);
1153 if (deps_stream
&& deps_stream
!= out_stream
1154 && (ferror (deps_stream
) || fclose (deps_stream
)))
1155 fatal_error (input_location
, "closing dependency file %s: %m", deps_file
);
1157 if (out_stream
&& (ferror (out_stream
) || fclose (out_stream
)))
1158 fatal_error (input_location
, "when writing output to %s: %m", out_fname
);
1161 /* Either of two environment variables can specify output of
1162 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1163 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1164 and DEPS_TARGET is the target to mention in the deps. They also
1165 result in dependency information being appended to the output file
1166 rather than overwriting it, and like Sun's compiler
1167 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1169 check_deps_environment_vars (void)
1173 spec
= getenv ("DEPENDENCIES_OUTPUT");
1175 cpp_opts
->deps
.style
= DEPS_USER
;
1178 spec
= getenv ("SUNPRO_DEPENDENCIES");
1181 cpp_opts
->deps
.style
= DEPS_SYSTEM
;
1182 cpp_opts
->deps
.ignore_main_file
= true;
1188 /* Find the space before the DEPS_TARGET, if there is one. */
1189 char *s
= strchr (spec
, ' ');
1192 /* Let the caller perform MAKE quoting. */
1193 defer_opt (OPT_MT
, s
+ 1);
1197 /* Command line -MF overrides environment variables and default. */
1206 /* Handle deferred command line switches. */
1208 handle_deferred_opts (void)
1213 /* Avoid allocating the deps buffer if we don't need it.
1214 (This flag may be true without there having been -MT or -MQ
1215 options, but we'll still need the deps buffer.) */
1219 deps
= cpp_get_deps (parse_in
);
1221 for (i
= 0; i
< deferred_count
; i
++)
1223 struct deferred_opt
*opt
= &deferred_opts
[i
];
1225 if (opt
->code
== OPT_MT
|| opt
->code
== OPT_MQ
)
1226 deps_add_target (deps
, opt
->arg
, opt
->code
== OPT_MQ
);
1230 /* These settings are appropriate for GCC, but not necessarily so for
1231 cpplib as a library. */
1233 sanitize_cpp_opts (void)
1235 /* If we don't know what style of dependencies to output, complain
1236 if any other dependency switches have been given. */
1237 if (deps_seen
&& cpp_opts
->deps
.style
== DEPS_NONE
)
1238 error ("to generate dependencies you must specify either -M or -MM");
1240 /* -dM and dependencies suppress normal output; do it here so that
1241 the last -d[MDN] switch overrides earlier ones. */
1242 if (flag_dump_macros
== 'M')
1245 /* By default, -fdirectives-only implies -dD. This allows subsequent phases
1246 to perform proper macro expansion. */
1247 if (cpp_opts
->directives_only
&& !cpp_opts
->preprocessed
&& !flag_dump_macros
)
1248 flag_dump_macros
= 'D';
1250 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1251 -dM since at least glibc relies on -M -dM to work. */
1252 /* Also, flag_no_output implies flag_no_line_commands, always. */
1255 if (flag_dump_macros
!= 'M')
1256 flag_dump_macros
= 0;
1257 flag_dump_includes
= 0;
1258 flag_no_line_commands
= 1;
1260 else if (cpp_opts
->deps
.missing_files
)
1261 error ("-MG may only be used with -M or -MM");
1263 cpp_opts
->unsigned_char
= !flag_signed_char
;
1264 cpp_opts
->stdc_0_in_system_headers
= STDC_0_IN_SYSTEM_HEADERS
;
1266 /* Wlong-long is disabled by default. It is enabled by:
1267 [-Wpedantic | -Wtraditional] -std=[gnu|c]++98 ; or
1268 [-Wpedantic | -Wtraditional] -std=non-c99
1270 Either -Wlong-long or -Wno-long-long override any other settings.
1271 ??? These conditions should be handled in c.opt. */
1272 if (warn_long_long
== -1)
1274 warn_long_long
= ((pedantic
|| warn_traditional
)
1275 && (c_dialect_cxx () ? cxx_dialect
== cxx98
: !flag_isoc99
));
1276 cpp_opts
->cpp_warn_long_long
= warn_long_long
;
1279 /* If we're generating preprocessor output, emit current directory
1280 if explicitly requested or if debugging information is enabled.
1281 ??? Maybe we should only do it for debugging formats that
1282 actually output the current directory? */
1283 if (flag_working_directory
== -1)
1284 flag_working_directory
= (debug_info_level
!= DINFO_LEVEL_NONE
);
1286 if (warn_implicit_fallthrough
< 5)
1287 cpp_opts
->cpp_warn_implicit_fallthrough
= warn_implicit_fallthrough
;
1289 cpp_opts
->cpp_warn_implicit_fallthrough
= 0;
1291 if (cpp_opts
->directives_only
)
1293 if (cpp_warn_unused_macros
)
1294 error ("-fdirectives-only is incompatible with -Wunused_macros");
1295 if (cpp_opts
->traditional
)
1296 error ("-fdirectives-only is incompatible with -traditional");
1300 /* Add include path with a prefix at the front of its name. */
1302 add_prefixed_path (const char *suffix
, size_t chain
)
1306 size_t prefix_len
, suffix_len
;
1308 suffix_len
= strlen (suffix
);
1309 prefix
= iprefix
? iprefix
: cpp_GCC_INCLUDE_DIR
;
1310 prefix_len
= iprefix
? strlen (iprefix
) : cpp_GCC_INCLUDE_DIR_len
;
1312 path
= (char *) xmalloc (prefix_len
+ suffix_len
+ 1);
1313 memcpy (path
, prefix
, prefix_len
);
1314 memcpy (path
+ prefix_len
, suffix
, suffix_len
);
1315 path
[prefix_len
+ suffix_len
] = '\0';
1317 add_path (path
, chain
, 0, false);
1320 /* Handle -D, -U, -A, -imacros, and the first -include. */
1322 c_finish_options (void)
1324 if (!cpp_opts
->preprocessed
)
1328 cb_file_change (parse_in
,
1329 linemap_check_ordinary (linemap_add (line_table
,
1333 /* Make sure all of the builtins about to be declared have
1334 BUILTINS_LOCATION has their source_location. */
1335 source_location builtins_loc
= BUILTINS_LOCATION
;
1336 cpp_force_token_locations (parse_in
, &builtins_loc
);
1338 cpp_init_builtins (parse_in
, flag_hosted
);
1339 c_cpp_builtins (parse_in
);
1341 cpp_stop_forcing_token_locations (parse_in
);
1343 /* We're about to send user input to cpplib, so make it warn for
1344 things that we previously (when we sent it internal definitions)
1345 told it to not warn.
1347 C99 permits implementation-defined characters in identifiers.
1348 The documented meaning of -std= is to turn off extensions that
1349 conflict with the specified standard, and since a strictly
1350 conforming program cannot contain a '$', we do not condition
1351 their acceptance on the -std= setting. */
1352 cpp_opts
->warn_dollars
= (cpp_opts
->cpp_pedantic
&& !cpp_opts
->c99
);
1354 cb_file_change (parse_in
,
1355 linemap_check_ordinary (linemap_add (line_table
, LC_RENAME
, 0,
1356 _("<command-line>"), 0)));
1358 for (i
= 0; i
< deferred_count
; i
++)
1360 struct deferred_opt
*opt
= &deferred_opts
[i
];
1362 if (opt
->code
== OPT_D
)
1363 cpp_define (parse_in
, opt
->arg
);
1364 else if (opt
->code
== OPT_U
)
1365 cpp_undef (parse_in
, opt
->arg
);
1366 else if (opt
->code
== OPT_A
)
1368 if (opt
->arg
[0] == '-')
1369 cpp_unassert (parse_in
, opt
->arg
+ 1);
1371 cpp_assert (parse_in
, opt
->arg
);
1375 /* Start the main input file, if the debug writer wants it. */
1376 if (debug_hooks
->start_end_main_source_file
1377 && !flag_preprocess_only
)
1378 (*debug_hooks
->start_source_file
) (0, this_input_filename
);
1380 /* Handle -imacros after -D and -U. */
1381 for (i
= 0; i
< deferred_count
; i
++)
1383 struct deferred_opt
*opt
= &deferred_opts
[i
];
1385 if (opt
->code
== OPT_imacros
1386 && cpp_push_include (parse_in
, opt
->arg
))
1388 /* Disable push_command_line_include callback for now. */
1389 include_cursor
= deferred_count
+ 1;
1390 cpp_scan_nooutput (parse_in
);
1396 if (cpp_opts
->directives_only
)
1397 cpp_init_special_builtins (parse_in
);
1399 /* Start the main input file, if the debug writer wants it. */
1400 if (debug_hooks
->start_end_main_source_file
1401 && !flag_preprocess_only
)
1402 (*debug_hooks
->start_source_file
) (0, this_input_filename
);
1406 push_command_line_include ();
1409 /* Give CPP the next file given by -include, if any. */
1411 push_command_line_include (void)
1413 /* This can happen if disabled by -imacros for example.
1414 Punt so that we don't set "<command-line>" as the filename for
1416 if (include_cursor
> deferred_count
)
1419 if (!done_preinclude
)
1421 done_preinclude
= true;
1422 if (flag_hosted
&& std_inc
&& !cpp_opts
->preprocessed
)
1424 const char *preinc
= targetcm
.c_preinclude ();
1425 if (preinc
&& cpp_push_default_include (parse_in
, preinc
))
1430 pch_cpp_save_state ();
1432 while (include_cursor
< deferred_count
)
1434 struct deferred_opt
*opt
= &deferred_opts
[include_cursor
++];
1436 if (!cpp_opts
->preprocessed
&& opt
->code
== OPT_include
1437 && cpp_push_include (parse_in
, opt
->arg
))
1441 if (include_cursor
== deferred_count
)
1444 /* -Wunused-macros should only warn about macros defined hereafter. */
1445 cpp_opts
->warn_unused_macros
= cpp_warn_unused_macros
;
1446 /* Restore the line map from <command line>. */
1447 if (!cpp_opts
->preprocessed
)
1448 cpp_change_file (parse_in
, LC_RENAME
, this_input_filename
);
1450 /* Set this here so the client can change the option if it wishes,
1451 and after stacking the main file so we don't trace the main file. */
1452 line_table
->trace_includes
= cpp_opts
->print_include_names
;
1456 /* File change callback. Has to handle -include files. */
1458 cb_file_change (cpp_reader
* ARG_UNUSED (pfile
),
1459 const line_map_ordinary
*new_map
)
1461 if (flag_preprocess_only
)
1462 pp_file_change (new_map
);
1464 fe_file_change (new_map
);
1467 && (new_map
->reason
== LC_ENTER
|| new_map
->reason
== LC_RENAME
))
1469 /* Signal to plugins that a file is included. This could happen
1470 several times with the same file path, e.g. because of
1471 several '#include' or '#line' directives... */
1472 invoke_plugin_callbacks
1473 (PLUGIN_INCLUDE_FILE
,
1474 const_cast<char*> (ORDINARY_MAP_FILE_NAME (new_map
)));
1477 if (new_map
== 0 || (new_map
->reason
== LC_LEAVE
&& MAIN_FILE_P (new_map
)))
1479 pch_cpp_save_state ();
1480 push_command_line_include ();
1485 cb_dir_change (cpp_reader
* ARG_UNUSED (pfile
), const char *dir
)
1487 if (!set_src_pwd (dir
))
1488 warning (0, "too late for # directive to set debug directory");
1491 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1492 extensions if ISO). There is no concept of gnu94. */
1494 set_std_c89 (int c94
, int iso
)
1496 cpp_set_lang (parse_in
, c94
? CLK_STDC94
: iso
? CLK_STDC89
: CLK_GNUC89
);
1499 flag_no_gnu_keywords
= iso
;
1500 flag_no_nonansi_builtin
= iso
;
1504 lang_hooks
.name
= "GNU C89";
1507 /* Set the C 99 standard (without GNU extensions if ISO). */
1509 set_std_c99 (int iso
)
1511 cpp_set_lang (parse_in
, iso
? CLK_STDC99
: CLK_GNUC99
);
1513 flag_no_nonansi_builtin
= iso
;
1518 lang_hooks
.name
= "GNU C99";
1521 /* Set the C 11 standard (without GNU extensions if ISO). */
1523 set_std_c11 (int iso
)
1525 cpp_set_lang (parse_in
, iso
? CLK_STDC11
: CLK_GNUC11
);
1527 flag_no_nonansi_builtin
= iso
;
1532 lang_hooks
.name
= "GNU C11";
1535 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1537 set_std_cxx98 (int iso
)
1539 cpp_set_lang (parse_in
, iso
? CLK_CXX98
: CLK_GNUCXX
);
1540 flag_no_gnu_keywords
= iso
;
1541 flag_no_nonansi_builtin
= iso
;
1545 cxx_dialect
= cxx98
;
1546 lang_hooks
.name
= "GNU C++98";
1549 /* Set the C++ 2011 standard (without GNU extensions if ISO). */
1551 set_std_cxx11 (int iso
)
1553 cpp_set_lang (parse_in
, iso
? CLK_CXX11
: CLK_GNUCXX11
);
1554 flag_no_gnu_keywords
= iso
;
1555 flag_no_nonansi_builtin
= iso
;
1557 /* C++11 includes the C99 standard library. */
1560 cxx_dialect
= cxx11
;
1561 lang_hooks
.name
= "GNU C++11";
1564 /* Set the C++ 2014 draft standard (without GNU extensions if ISO). */
1566 set_std_cxx14 (int iso
)
1568 cpp_set_lang (parse_in
, iso
? CLK_CXX14
: CLK_GNUCXX14
);
1569 flag_no_gnu_keywords
= iso
;
1570 flag_no_nonansi_builtin
= iso
;
1572 /* C++11 includes the C99 standard library. */
1575 cxx_dialect
= cxx14
;
1576 lang_hooks
.name
= "GNU C++14";
1579 /* Set the C++ 201z draft standard (without GNU extensions if ISO). */
1581 set_std_cxx1z (int iso
)
1583 cpp_set_lang (parse_in
, iso
? CLK_CXX1Z
: CLK_GNUCXX1Z
);
1584 flag_no_gnu_keywords
= iso
;
1585 flag_no_nonansi_builtin
= iso
;
1587 /* C++11 includes the C99 standard library. */
1591 cxx_dialect
= cxx1z
;
1592 lang_hooks
.name
= "GNU C++14"; /* Pretend C++14 till standarization. */
1595 /* Args to -d specify what to dump. Silently ignore
1596 unrecognized options; they may be aimed at toplev.c. */
1598 handle_OPT_d (const char *arg
)
1602 while ((c
= *arg
++) != '\0')
1605 case 'M': /* Dump macros only. */
1606 case 'N': /* Dump names. */
1607 case 'D': /* Dump definitions. */
1608 case 'U': /* Dump used macros. */
1609 flag_dump_macros
= c
;
1613 flag_dump_includes
= 1;