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 /* By default, enable the new inheriting constructor semantics along with ABI
906 11. New and old should coexist fine, but it is a change in what
907 artificial symbols are generated. */
908 if (!global_options_set
.x_flag_new_inheriting_ctors
)
909 flag_new_inheriting_ctors
= abi_version_at_least (11);
911 if (cxx_dialect
>= cxx11
)
913 /* If we're allowing C++0x constructs, don't warn about C++98
914 identifiers which are keywords in C++0x. */
915 warn_cxx11_compat
= 0;
916 cpp_opts
->cpp_warn_cxx11_compat
= 0;
918 if (warn_narrowing
== -1)
921 /* Unless -f{,no-}ext-numeric-literals has been used explicitly,
922 for -std=c++{11,14,1z} default to -fno-ext-numeric-literals. */
923 if (flag_iso
&& !global_options_set
.x_flag_ext_numeric_literals
)
924 cpp_opts
->ext_numeric_literals
= 0;
926 else if (warn_narrowing
== -1)
929 /* C++17 has stricter evaluation order requirements; let's use some of them
930 for earlier C++ as well, so chaining works as expected. */
932 && flag_strong_eval_order
== -1)
933 flag_strong_eval_order
= (cxx_dialect
>= cxx1z
? 2 : 1);
935 /* Global sized deallocation is new in C++14. */
936 if (flag_sized_deallocation
== -1)
937 flag_sized_deallocation
= (cxx_dialect
>= cxx14
);
939 if (flag_extern_tls_init
)
941 #if !defined (ASM_OUTPUT_DEF) || !SUPPORTS_WEAK
942 /* Lazy TLS initialization for a variable in another TU requires
943 alias and weak reference support. */
944 if (flag_extern_tls_init
> 0)
945 sorry ("external TLS initialization functions not supported "
947 flag_extern_tls_init
= 0;
949 flag_extern_tls_init
= 1;
953 if (flag_preprocess_only
)
955 /* Open the output now. We must do so even if flag_no_output is
956 on, because there may be other output than from the actual
957 preprocessing (e.g. from -dM). */
958 if (out_fname
[0] == '\0')
961 out_stream
= fopen (out_fname
, "w");
963 if (out_stream
== NULL
)
965 fatal_error (input_location
, "opening output file %s: %m", out_fname
);
969 if (num_in_fnames
> 1)
970 error ("too many filenames given. Type %s --help for usage",
973 init_pp_output (out_stream
);
979 /* When writing a PCH file, avoid reading some other PCH file,
980 because the default address space slot then can't be used
981 for the output PCH file. */
984 c_common_no_more_pch ();
985 /* Only -g0 and -gdwarf* are supported with PCH, for other
986 debug formats we warn here and refuse to load any PCH files. */
987 if (write_symbols
!= NO_DEBUG
&& write_symbols
!= DWARF2_DEBUG
)
988 warning (OPT_Wdeprecated
,
989 "the \"%s\" debug format cannot be used with "
990 "pre-compiled headers", debug_type_names
[write_symbols
]);
992 else if (write_symbols
!= NO_DEBUG
&& write_symbols
!= DWARF2_DEBUG
)
993 c_common_no_more_pch ();
995 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
996 input_location
= UNKNOWN_LOCATION
;
999 cb
= cpp_get_callbacks (parse_in
);
1000 cb
->file_change
= cb_file_change
;
1001 cb
->dir_change
= cb_dir_change
;
1002 cpp_post_options (parse_in
);
1003 init_global_opts_from_cpp (&global_options
, cpp_get_options (parse_in
));
1005 input_location
= UNKNOWN_LOCATION
;
1007 *pfilename
= this_input_filename
1008 = cpp_read_main_file (parse_in
, in_fnames
[0]);
1009 /* Don't do any compilation or preprocessing if there is no input file. */
1010 if (this_input_filename
== NULL
)
1016 if (flag_working_directory
1017 && flag_preprocess_only
&& !flag_no_line_commands
)
1018 pp_dir_change (parse_in
, get_src_pwd ());
1020 /* Disable LTO output when outputting a precompiled header. */
1021 if (pch_file
&& flag_lto
)
1024 flag_generate_lto
= 0;
1027 return flag_preprocess_only
;
1030 /* Front end initialization common to C, ObjC and C++. */
1032 c_common_init (void)
1034 /* Set up preprocessor arithmetic. Must be done after call to
1035 c_common_nodes_and_builtins for type nodes to be good. */
1036 cpp_opts
->precision
= TYPE_PRECISION (intmax_type_node
);
1037 cpp_opts
->char_precision
= TYPE_PRECISION (char_type_node
);
1038 cpp_opts
->int_precision
= TYPE_PRECISION (integer_type_node
);
1039 cpp_opts
->wchar_precision
= TYPE_PRECISION (wchar_type_node
);
1040 cpp_opts
->unsigned_wchar
= TYPE_UNSIGNED (wchar_type_node
);
1041 cpp_opts
->bytes_big_endian
= BYTES_BIG_ENDIAN
;
1043 /* This can't happen until after wchar_precision and bytes_big_endian
1045 cpp_init_iconv (parse_in
);
1050 fputs ("Compiler executable checksum: ", stderr
);
1051 for (i
= 0; i
< 16; i
++)
1052 fprintf (stderr
, "%02x", executable_checksum
[i
]);
1053 putc ('\n', stderr
);
1056 /* Has to wait until now so that cpplib has its hash table. */
1059 if (flag_preprocess_only
)
1061 c_finish_options ();
1062 preprocess_file (parse_in
);
1069 /* Initialize the integrated preprocessor after debug output has been
1070 initialized; loop over each input file. */
1072 c_common_parse_file (void)
1079 c_finish_options ();
1080 /* Open the dump files to use for the original and class dump output
1081 here, to be used during parsing for the current file. */
1082 original_dump_file
= dump_begin (TDI_original
, &original_dump_flags
);
1083 class_dump_file
= dump_begin (TDI_class
, &class_dump_flags
);
1088 /* And end the main input file, if the debug writer wants it */
1089 if (debug_hooks
->start_end_main_source_file
)
1090 (*debug_hooks
->end_source_file
) (0);
1091 if (++i
>= num_in_fnames
)
1093 cpp_undef_all (parse_in
);
1094 cpp_clear_file_cache (parse_in
);
1096 = cpp_read_main_file (parse_in
, in_fnames
[i
]);
1097 if (original_dump_file
)
1099 dump_end (TDI_original
, original_dump_file
);
1100 original_dump_file
= NULL
;
1102 if (class_dump_file
)
1104 dump_end (TDI_class
, class_dump_file
);
1105 class_dump_file
= NULL
;
1107 /* If an input file is missing, abandon further compilation.
1108 cpplib has issued a diagnostic. */
1109 if (!this_input_filename
)
1113 c_parse_final_cleanups ();
1116 /* Returns the appropriate dump file for PHASE to dump with FLAGS. */
1118 get_dump_info (int phase
, int *flags
)
1120 gcc_assert (phase
== TDI_original
|| phase
== TDI_class
);
1121 if (phase
== TDI_original
)
1123 *flags
= original_dump_flags
;
1124 return original_dump_file
;
1128 *flags
= class_dump_flags
;
1129 return class_dump_file
;
1133 /* Common finish hook for the C, ObjC and C++ front ends. */
1135 c_common_finish (void)
1137 FILE *deps_stream
= NULL
;
1139 /* Don't write the deps file if there are errors. */
1140 if (cpp_opts
->deps
.style
!= DEPS_NONE
&& !seen_error ())
1142 /* If -M or -MM was seen without -MF, default output to the
1145 deps_stream
= out_stream
;
1148 deps_stream
= fopen (deps_file
, deps_append
? "a": "w");
1150 fatal_error (input_location
, "opening dependency file %s: %m",
1155 /* For performance, avoid tearing down cpplib's internal structures
1156 with cpp_destroy (). */
1157 cpp_finish (parse_in
, deps_stream
);
1159 if (deps_stream
&& deps_stream
!= out_stream
1160 && (ferror (deps_stream
) || fclose (deps_stream
)))
1161 fatal_error (input_location
, "closing dependency file %s: %m", deps_file
);
1163 if (out_stream
&& (ferror (out_stream
) || fclose (out_stream
)))
1164 fatal_error (input_location
, "when writing output to %s: %m", out_fname
);
1167 /* Either of two environment variables can specify output of
1168 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1169 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1170 and DEPS_TARGET is the target to mention in the deps. They also
1171 result in dependency information being appended to the output file
1172 rather than overwriting it, and like Sun's compiler
1173 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1175 check_deps_environment_vars (void)
1179 spec
= getenv ("DEPENDENCIES_OUTPUT");
1181 cpp_opts
->deps
.style
= DEPS_USER
;
1184 spec
= getenv ("SUNPRO_DEPENDENCIES");
1187 cpp_opts
->deps
.style
= DEPS_SYSTEM
;
1188 cpp_opts
->deps
.ignore_main_file
= true;
1194 /* Find the space before the DEPS_TARGET, if there is one. */
1195 char *s
= strchr (spec
, ' ');
1198 /* Let the caller perform MAKE quoting. */
1199 defer_opt (OPT_MT
, s
+ 1);
1203 /* Command line -MF overrides environment variables and default. */
1212 /* Handle deferred command line switches. */
1214 handle_deferred_opts (void)
1219 /* Avoid allocating the deps buffer if we don't need it.
1220 (This flag may be true without there having been -MT or -MQ
1221 options, but we'll still need the deps buffer.) */
1225 deps
= cpp_get_deps (parse_in
);
1227 for (i
= 0; i
< deferred_count
; i
++)
1229 struct deferred_opt
*opt
= &deferred_opts
[i
];
1231 if (opt
->code
== OPT_MT
|| opt
->code
== OPT_MQ
)
1232 deps_add_target (deps
, opt
->arg
, opt
->code
== OPT_MQ
);
1236 /* These settings are appropriate for GCC, but not necessarily so for
1237 cpplib as a library. */
1239 sanitize_cpp_opts (void)
1241 /* If we don't know what style of dependencies to output, complain
1242 if any other dependency switches have been given. */
1243 if (deps_seen
&& cpp_opts
->deps
.style
== DEPS_NONE
)
1244 error ("to generate dependencies you must specify either -M or -MM");
1246 /* -dM and dependencies suppress normal output; do it here so that
1247 the last -d[MDN] switch overrides earlier ones. */
1248 if (flag_dump_macros
== 'M')
1251 /* By default, -fdirectives-only implies -dD. This allows subsequent phases
1252 to perform proper macro expansion. */
1253 if (cpp_opts
->directives_only
&& !cpp_opts
->preprocessed
&& !flag_dump_macros
)
1254 flag_dump_macros
= 'D';
1256 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1257 -dM since at least glibc relies on -M -dM to work. */
1258 /* Also, flag_no_output implies flag_no_line_commands, always. */
1261 if (flag_dump_macros
!= 'M')
1262 flag_dump_macros
= 0;
1263 flag_dump_includes
= 0;
1264 flag_no_line_commands
= 1;
1266 else if (cpp_opts
->deps
.missing_files
)
1267 error ("-MG may only be used with -M or -MM");
1269 cpp_opts
->unsigned_char
= !flag_signed_char
;
1270 cpp_opts
->stdc_0_in_system_headers
= STDC_0_IN_SYSTEM_HEADERS
;
1272 /* Wlong-long is disabled by default. It is enabled by:
1273 [-Wpedantic | -Wtraditional] -std=[gnu|c]++98 ; or
1274 [-Wpedantic | -Wtraditional] -std=non-c99
1276 Either -Wlong-long or -Wno-long-long override any other settings.
1277 ??? These conditions should be handled in c.opt. */
1278 if (warn_long_long
== -1)
1280 warn_long_long
= ((pedantic
|| warn_traditional
)
1281 && (c_dialect_cxx () ? cxx_dialect
== cxx98
: !flag_isoc99
));
1282 cpp_opts
->cpp_warn_long_long
= warn_long_long
;
1285 /* If we're generating preprocessor output, emit current directory
1286 if explicitly requested or if debugging information is enabled.
1287 ??? Maybe we should only do it for debugging formats that
1288 actually output the current directory? */
1289 if (flag_working_directory
== -1)
1290 flag_working_directory
= (debug_info_level
!= DINFO_LEVEL_NONE
);
1292 if (warn_implicit_fallthrough
< 5)
1293 cpp_opts
->cpp_warn_implicit_fallthrough
= warn_implicit_fallthrough
;
1295 cpp_opts
->cpp_warn_implicit_fallthrough
= 0;
1297 if (cpp_opts
->directives_only
)
1299 if (cpp_warn_unused_macros
)
1300 error ("-fdirectives-only is incompatible with -Wunused_macros");
1301 if (cpp_opts
->traditional
)
1302 error ("-fdirectives-only is incompatible with -traditional");
1306 /* Add include path with a prefix at the front of its name. */
1308 add_prefixed_path (const char *suffix
, size_t chain
)
1312 size_t prefix_len
, suffix_len
;
1314 suffix_len
= strlen (suffix
);
1315 prefix
= iprefix
? iprefix
: cpp_GCC_INCLUDE_DIR
;
1316 prefix_len
= iprefix
? strlen (iprefix
) : cpp_GCC_INCLUDE_DIR_len
;
1318 path
= (char *) xmalloc (prefix_len
+ suffix_len
+ 1);
1319 memcpy (path
, prefix
, prefix_len
);
1320 memcpy (path
+ prefix_len
, suffix
, suffix_len
);
1321 path
[prefix_len
+ suffix_len
] = '\0';
1323 add_path (path
, chain
, 0, false);
1326 /* Handle -D, -U, -A, -imacros, and the first -include. */
1328 c_finish_options (void)
1330 if (!cpp_opts
->preprocessed
)
1334 cb_file_change (parse_in
,
1335 linemap_check_ordinary (linemap_add (line_table
,
1339 /* Make sure all of the builtins about to be declared have
1340 BUILTINS_LOCATION has their source_location. */
1341 source_location builtins_loc
= BUILTINS_LOCATION
;
1342 cpp_force_token_locations (parse_in
, &builtins_loc
);
1344 cpp_init_builtins (parse_in
, flag_hosted
);
1345 c_cpp_builtins (parse_in
);
1347 cpp_stop_forcing_token_locations (parse_in
);
1349 /* We're about to send user input to cpplib, so make it warn for
1350 things that we previously (when we sent it internal definitions)
1351 told it to not warn.
1353 C99 permits implementation-defined characters in identifiers.
1354 The documented meaning of -std= is to turn off extensions that
1355 conflict with the specified standard, and since a strictly
1356 conforming program cannot contain a '$', we do not condition
1357 their acceptance on the -std= setting. */
1358 cpp_opts
->warn_dollars
= (cpp_opts
->cpp_pedantic
&& !cpp_opts
->c99
);
1360 cb_file_change (parse_in
,
1361 linemap_check_ordinary (linemap_add (line_table
, LC_RENAME
, 0,
1362 _("<command-line>"), 0)));
1364 for (i
= 0; i
< deferred_count
; i
++)
1366 struct deferred_opt
*opt
= &deferred_opts
[i
];
1368 if (opt
->code
== OPT_D
)
1369 cpp_define (parse_in
, opt
->arg
);
1370 else if (opt
->code
== OPT_U
)
1371 cpp_undef (parse_in
, opt
->arg
);
1372 else if (opt
->code
== OPT_A
)
1374 if (opt
->arg
[0] == '-')
1375 cpp_unassert (parse_in
, opt
->arg
+ 1);
1377 cpp_assert (parse_in
, opt
->arg
);
1381 /* Start the main input file, if the debug writer wants it. */
1382 if (debug_hooks
->start_end_main_source_file
1383 && !flag_preprocess_only
)
1384 (*debug_hooks
->start_source_file
) (0, this_input_filename
);
1386 /* Handle -imacros after -D and -U. */
1387 for (i
= 0; i
< deferred_count
; i
++)
1389 struct deferred_opt
*opt
= &deferred_opts
[i
];
1391 if (opt
->code
== OPT_imacros
1392 && cpp_push_include (parse_in
, opt
->arg
))
1394 /* Disable push_command_line_include callback for now. */
1395 include_cursor
= deferred_count
+ 1;
1396 cpp_scan_nooutput (parse_in
);
1402 if (cpp_opts
->directives_only
)
1403 cpp_init_special_builtins (parse_in
);
1405 /* Start the main input file, if the debug writer wants it. */
1406 if (debug_hooks
->start_end_main_source_file
1407 && !flag_preprocess_only
)
1408 (*debug_hooks
->start_source_file
) (0, this_input_filename
);
1412 push_command_line_include ();
1415 /* Give CPP the next file given by -include, if any. */
1417 push_command_line_include (void)
1419 /* This can happen if disabled by -imacros for example.
1420 Punt so that we don't set "<command-line>" as the filename for
1422 if (include_cursor
> deferred_count
)
1425 if (!done_preinclude
)
1427 done_preinclude
= true;
1428 if (flag_hosted
&& std_inc
&& !cpp_opts
->preprocessed
)
1430 const char *preinc
= targetcm
.c_preinclude ();
1431 if (preinc
&& cpp_push_default_include (parse_in
, preinc
))
1436 pch_cpp_save_state ();
1438 while (include_cursor
< deferred_count
)
1440 struct deferred_opt
*opt
= &deferred_opts
[include_cursor
++];
1442 if (!cpp_opts
->preprocessed
&& opt
->code
== OPT_include
1443 && cpp_push_include (parse_in
, opt
->arg
))
1447 if (include_cursor
== deferred_count
)
1450 /* -Wunused-macros should only warn about macros defined hereafter. */
1451 cpp_opts
->warn_unused_macros
= cpp_warn_unused_macros
;
1452 /* Restore the line map from <command line>. */
1453 if (!cpp_opts
->preprocessed
)
1454 cpp_change_file (parse_in
, LC_RENAME
, this_input_filename
);
1456 /* Set this here so the client can change the option if it wishes,
1457 and after stacking the main file so we don't trace the main file. */
1458 line_table
->trace_includes
= cpp_opts
->print_include_names
;
1462 /* File change callback. Has to handle -include files. */
1464 cb_file_change (cpp_reader
* ARG_UNUSED (pfile
),
1465 const line_map_ordinary
*new_map
)
1467 if (flag_preprocess_only
)
1468 pp_file_change (new_map
);
1470 fe_file_change (new_map
);
1473 && (new_map
->reason
== LC_ENTER
|| new_map
->reason
== LC_RENAME
))
1475 /* Signal to plugins that a file is included. This could happen
1476 several times with the same file path, e.g. because of
1477 several '#include' or '#line' directives... */
1478 invoke_plugin_callbacks
1479 (PLUGIN_INCLUDE_FILE
,
1480 const_cast<char*> (ORDINARY_MAP_FILE_NAME (new_map
)));
1483 if (new_map
== 0 || (new_map
->reason
== LC_LEAVE
&& MAIN_FILE_P (new_map
)))
1485 pch_cpp_save_state ();
1486 push_command_line_include ();
1491 cb_dir_change (cpp_reader
* ARG_UNUSED (pfile
), const char *dir
)
1493 if (!set_src_pwd (dir
))
1494 warning (0, "too late for # directive to set debug directory");
1497 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1498 extensions if ISO). There is no concept of gnu94. */
1500 set_std_c89 (int c94
, int iso
)
1502 cpp_set_lang (parse_in
, c94
? CLK_STDC94
: iso
? CLK_STDC89
: CLK_GNUC89
);
1505 flag_no_gnu_keywords
= iso
;
1506 flag_no_nonansi_builtin
= iso
;
1510 lang_hooks
.name
= "GNU C89";
1513 /* Set the C 99 standard (without GNU extensions if ISO). */
1515 set_std_c99 (int iso
)
1517 cpp_set_lang (parse_in
, iso
? CLK_STDC99
: CLK_GNUC99
);
1519 flag_no_nonansi_builtin
= iso
;
1524 lang_hooks
.name
= "GNU C99";
1527 /* Set the C 11 standard (without GNU extensions if ISO). */
1529 set_std_c11 (int iso
)
1531 cpp_set_lang (parse_in
, iso
? CLK_STDC11
: CLK_GNUC11
);
1533 flag_no_nonansi_builtin
= iso
;
1538 lang_hooks
.name
= "GNU C11";
1541 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1543 set_std_cxx98 (int iso
)
1545 cpp_set_lang (parse_in
, iso
? CLK_CXX98
: CLK_GNUCXX
);
1546 flag_no_gnu_keywords
= iso
;
1547 flag_no_nonansi_builtin
= iso
;
1551 cxx_dialect
= cxx98
;
1552 lang_hooks
.name
= "GNU C++98";
1555 /* Set the C++ 2011 standard (without GNU extensions if ISO). */
1557 set_std_cxx11 (int iso
)
1559 cpp_set_lang (parse_in
, iso
? CLK_CXX11
: CLK_GNUCXX11
);
1560 flag_no_gnu_keywords
= iso
;
1561 flag_no_nonansi_builtin
= iso
;
1563 /* C++11 includes the C99 standard library. */
1566 cxx_dialect
= cxx11
;
1567 lang_hooks
.name
= "GNU C++11";
1570 /* Set the C++ 2014 draft standard (without GNU extensions if ISO). */
1572 set_std_cxx14 (int iso
)
1574 cpp_set_lang (parse_in
, iso
? CLK_CXX14
: CLK_GNUCXX14
);
1575 flag_no_gnu_keywords
= iso
;
1576 flag_no_nonansi_builtin
= iso
;
1578 /* C++11 includes the C99 standard library. */
1581 cxx_dialect
= cxx14
;
1582 lang_hooks
.name
= "GNU C++14";
1585 /* Set the C++ 201z draft standard (without GNU extensions if ISO). */
1587 set_std_cxx1z (int iso
)
1589 cpp_set_lang (parse_in
, iso
? CLK_CXX1Z
: CLK_GNUCXX1Z
);
1590 flag_no_gnu_keywords
= iso
;
1591 flag_no_nonansi_builtin
= iso
;
1593 /* C++11 includes the C99 standard library. */
1597 cxx_dialect
= cxx1z
;
1598 lang_hooks
.name
= "GNU C++14"; /* Pretend C++14 till standarization. */
1601 /* Args to -d specify what to dump. Silently ignore
1602 unrecognized options; they may be aimed at toplev.c. */
1604 handle_OPT_d (const char *arg
)
1608 while ((c
= *arg
++) != '\0')
1611 case 'M': /* Dump macros only. */
1612 case 'N': /* Dump names. */
1613 case 'D': /* Dump definitions. */
1614 case 'U': /* Dump used macros. */
1615 flag_dump_macros
= c
;
1619 flag_dump_includes
= 1;