1 /* C/ObjC/C++ command line option handling.
2 Copyright (C) 2002-2015 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"
31 #include "langhooks.h"
32 #include "diagnostic.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. */
42 #include "tm_p.h" /* For C_COMMON_OVERRIDE_OPTIONS. */
45 #ifndef DOLLARS_IN_IDENTIFIERS
46 # define DOLLARS_IN_IDENTIFIERS true
49 #ifndef TARGET_SYSTEM_ROOT
50 # define TARGET_SYSTEM_ROOT NULL
54 #define TARGET_OPTF(ARG)
58 cpp_options
*cpp_opts
;
61 static const char *this_input_filename
;
63 /* Filename and stream for preprocessed output. */
64 static const char *out_fname
;
65 static FILE *out_stream
;
67 /* Append dependencies to deps_file. */
68 static bool deps_append
;
70 /* If dependency switches (-MF etc.) have been given. */
71 static bool deps_seen
;
76 /* Dependency output file. */
77 static const char *deps_file
;
79 /* The prefix given by -iprefix, if any. */
80 static const char *iprefix
;
82 /* The multilib directory given by -imultilib, if any. */
83 static const char *imultilib
;
85 /* The system root, if any. Overridden by -isysroot. */
86 static const char *sysroot
= TARGET_SYSTEM_ROOT
;
88 /* Zero disables all standard directories for headers. */
89 static bool std_inc
= true;
91 /* Zero disables the C++-specific standard directories for headers. */
92 static bool std_cxx_inc
= true;
94 /* If the quote chain has been split by -I-. */
95 static bool quote_chain_split
;
97 /* Number of deferred options. */
98 static size_t deferred_count
;
100 /* Number of deferred options scanned for -include. */
101 static size_t include_cursor
;
103 /* Dump files/flags to use during parsing. */
104 static FILE *original_dump_file
= NULL
;
105 static int original_dump_flags
;
106 static FILE *class_dump_file
= NULL
;
107 static int class_dump_flags
;
109 /* Whether any standard preincluded header has been preincluded. */
110 static bool done_preinclude
;
112 static void handle_OPT_d (const char *);
113 static void set_std_cxx98 (int);
114 static void set_std_cxx11 (int);
115 static void set_std_cxx14 (int);
116 static void set_std_cxx1z (int);
117 static void set_std_c89 (int, int);
118 static void set_std_c99 (int);
119 static void set_std_c11 (int);
120 static void check_deps_environment_vars (void);
121 static void handle_deferred_opts (void);
122 static void sanitize_cpp_opts (void);
123 static void add_prefixed_path (const char *, size_t);
124 static void push_command_line_include (void);
125 static void cb_file_change (cpp_reader
*, const line_map_ordinary
*);
126 static void cb_dir_change (cpp_reader
*, const char *);
127 static void c_finish_options (void);
129 #ifndef STDC_0_IN_SYSTEM_HEADERS
130 #define STDC_0_IN_SYSTEM_HEADERS 0
133 /* Holds switches parsed by c_common_handle_option (), but whose
134 handling is deferred to c_common_post_options (). */
135 static void defer_opt (enum opt_code
, const char *);
136 static struct deferred_opt
143 extern const unsigned int
144 c_family_lang_mask
= (CL_C
| CL_CXX
| CL_ObjC
| CL_ObjCXX
);
146 /* Defer option CODE with argument ARG. */
148 defer_opt (enum opt_code code
, const char *arg
)
150 deferred_opts
[deferred_count
].code
= code
;
151 deferred_opts
[deferred_count
].arg
= arg
;
155 /* Return language mask for option parsing. */
157 c_common_option_lang_mask (void)
159 static const unsigned int lang_flags
[] = {CL_C
, CL_ObjC
, CL_CXX
, CL_ObjCXX
};
161 return lang_flags
[c_language
];
164 /* Diagnostic finalizer for C/C++/Objective-C/Objective-C++. */
166 c_diagnostic_finalizer (diagnostic_context
*context
,
167 diagnostic_info
*diagnostic
)
169 diagnostic_show_locus (context
, diagnostic
);
170 /* By default print macro expansion contexts in the diagnostic
171 finalizer -- for tokens resulting from macro expansion. */
172 virt_loc_aware_diagnostic_finalizer (context
, diagnostic
);
173 pp_destroy_prefix (context
->printer
);
174 pp_newline_and_flush (context
->printer
);
177 /* Common default settings for diagnostics. */
179 c_common_diagnostics_set_defaults (diagnostic_context
*context
)
181 diagnostic_finalizer (context
) = c_diagnostic_finalizer
;
182 context
->opt_permissive
= OPT_fpermissive
;
185 /* Whether options from all C-family languages should be accepted
187 static bool accept_all_c_family_options
= false;
189 /* Return whether to complain about a wrong-language option. */
191 c_common_complain_wrong_lang_p (const struct cl_option
*option
)
193 if (accept_all_c_family_options
194 && (option
->flags
& c_family_lang_mask
))
200 /* Initialize options structure OPTS. */
202 c_common_init_options_struct (struct gcc_options
*opts
)
204 opts
->x_flag_exceptions
= c_dialect_cxx ();
205 opts
->x_warn_pointer_arith
= c_dialect_cxx ();
206 opts
->x_warn_write_strings
= c_dialect_cxx ();
207 opts
->x_flag_warn_unused_result
= true;
209 /* By default, C99-like requirements for complex multiply and divide. */
210 opts
->x_flag_complex_method
= 2;
213 /* Common initialization before calling option handlers. */
215 c_common_init_options (unsigned int decoded_options_count
,
216 struct cl_decoded_option
*decoded_options
)
219 struct cpp_callbacks
*cb
;
221 parse_in
= cpp_create_reader (c_dialect_cxx () ? CLK_GNUCXX
: CLK_GNUC89
,
222 ident_hash
, line_table
);
223 cb
= cpp_get_callbacks (parse_in
);
224 cb
->error
= c_cpp_error
;
226 cpp_opts
= cpp_get_options (parse_in
);
227 cpp_opts
->dollars_in_ident
= DOLLARS_IN_IDENTIFIERS
;
228 cpp_opts
->objc
= c_dialect_objc ();
230 /* Reset to avoid warnings on internal definitions. We set it just
231 before passing on command-line options to cpplib. */
232 cpp_opts
->warn_dollars
= 0;
234 deferred_opts
= XNEWVEC (struct deferred_opt
, decoded_options_count
);
236 if (c_language
== clk_c
)
238 /* The default for C is gnu11. */
239 set_std_c11 (false /* ISO */);
241 /* If preprocessing assembly language, accept any of the C-family
242 front end options since the driver may pass them through. */
243 for (i
= 1; i
< decoded_options_count
; i
++)
244 if (decoded_options
[i
].opt_index
== OPT_lang_asm
)
246 accept_all_c_family_options
= true;
252 /* Handle switch SCODE with argument ARG. VALUE is true, unless no-
253 form of an -f or -W option was given. Returns false if the switch was
254 invalid, true if valid. Use HANDLERS in recursive handle_option calls. */
256 c_common_handle_option (size_t scode
, const char *arg
, int value
,
257 int kind
, location_t loc
,
258 const struct cl_option_handlers
*handlers
)
260 const struct cl_option
*option
= &cl_options
[scode
];
261 enum opt_code code
= (enum opt_code
) scode
;
264 /* Prevent resetting the language standard to a C dialect when the driver
265 has already determined that we're looking at assembler input. */
266 bool preprocessing_asm_p
= (cpp_get_options (parse_in
)->lang
== CLK_ASM
);
271 if (cl_options
[code
].flags
& c_family_lang_mask
)
273 if ((option
->flags
& CL_TARGET
)
274 && ! targetcm
.handle_c_option (scode
, arg
, value
))
281 case OPT__output_pch_
:
286 defer_opt (code
, arg
);
290 cpp_opts
->discard_comments
= 0;
294 cpp_opts
->discard_comments
= 0;
295 cpp_opts
->discard_comments_in_macro_exp
= 0;
299 defer_opt (code
, arg
);
303 cpp_opts
->print_include_names
= 1;
307 TARGET_OPTF (xstrdup (arg
));
311 if (strcmp (arg
, "-"))
312 add_path (xstrdup (arg
), BRACKET
, 0, true);
315 if (quote_chain_split
)
316 error ("-I- specified twice");
317 quote_chain_split
= true;
318 split_quote_chain ();
319 inform (input_location
, "obsolete option -I- used, please use -iquote instead");
325 /* When doing dependencies with -M or -MM, suppress normal
326 preprocessed output, but still do -dM etc. as software
327 depends on this. Preprocessed output does occur if -MD, -MMD
328 or environment var dependency generation is used. */
329 cpp_opts
->deps
.style
= (code
== OPT_M
? DEPS_SYSTEM
: DEPS_USER
);
335 cpp_opts
->deps
.style
= (code
== OPT_MD
? DEPS_SYSTEM
: DEPS_USER
);
336 cpp_opts
->deps
.need_preprocessor_output
= true;
347 cpp_opts
->deps
.missing_files
= true;
352 cpp_opts
->deps
.phony_targets
= true;
358 defer_opt (code
, arg
);
362 flag_no_line_commands
= 1;
366 defer_opt (code
, arg
);
370 /* ??? Don't add new options here. Use LangEnabledBy in c.opt. */
372 cpp_opts
->warn_num_sign_change
= value
;
375 case OPT_Wunknown_pragmas
:
376 /* Set to greater than 1, so that even unknown pragmas in
377 system headers will be warned about. */
378 /* ??? There is no way to handle this automatically for now. */
379 warn_unknown_pragmas
= value
* 2;
383 if (!c_dialect_cxx ())
384 set_std_c89 (false, true);
386 set_std_cxx98 (true);
397 warning (0, "%<-Wabi=1%> is not supported, using =2");
400 warn_abi_version
= value
;
401 if (flag_abi_compat_version
== -1)
402 flag_abi_compat_version
= value
;
405 case OPT_fcanonical_system_headers
:
406 cpp_opts
->canonical_system_headers
= value
;
409 case OPT_fcond_mismatch
:
410 if (!c_dialect_cxx ())
412 flag_cond_mismatch
= value
;
415 warning (0, "switch %qs is no longer supported", option
->opt_text
);
422 disable_builtin_function (arg
);
425 case OPT_fdirectives_only
:
426 cpp_opts
->directives_only
= value
;
429 case OPT_fdollars_in_identifiers
:
430 cpp_opts
->dollars_in_ident
= value
;
433 case OPT_ffreestanding
:
435 /* Fall through.... */
438 flag_no_builtin
= !value
;
441 case OPT_fconstant_string_class_
:
442 constant_string_class_name
= arg
;
445 case OPT_fextended_identifiers
:
446 cpp_opts
->extended_identifiers
= value
;
449 case OPT_foperator_names
:
450 cpp_opts
->operator_names
= value
;
454 cpp_opts
->restore_pch_deps
= value
;
457 case OPT_fpch_preprocess
:
458 flag_pch_preprocess
= value
;
461 case OPT_fpermissive
:
462 flag_permissive
= value
;
463 global_dc
->permissive
= value
;
466 case OPT_fpreprocessed
:
467 cpp_opts
->preprocessed
= value
;
474 case OPT_ftrack_macro_expansion
:
479 case OPT_ftrack_macro_expansion_
:
480 if (arg
&& *arg
!= '\0')
481 cpp_opts
->track_macro_expansion
= value
;
483 cpp_opts
->track_macro_expansion
= 2;
487 flag_use_repository
= value
;
489 flag_implicit_templates
= 0;
493 /* It is documented that we silently ignore silly values. */
494 if (value
>= 1 && value
<= 100)
495 cpp_opts
->tabstop
= value
;
498 case OPT_fexec_charset_
:
499 cpp_opts
->narrow_charset
= arg
;
502 case OPT_fwide_exec_charset_
:
503 cpp_opts
->wide_charset
= arg
;
506 case OPT_finput_charset_
:
507 cpp_opts
->input_charset
= arg
;
510 case OPT_ftemplate_depth_
:
511 max_tinst_depth
= value
;
514 case OPT_fvisibility_inlines_hidden
:
515 visibility_options
.inlines_hidden
= value
;
518 case OPT_femit_struct_debug_baseonly
:
519 set_struct_debug_option (&global_options
, loc
, "base");
522 case OPT_femit_struct_debug_reduced
:
523 set_struct_debug_option (&global_options
, loc
,
524 "dir:ord:sys,dir:gen:any,ind:base");
527 case OPT_femit_struct_debug_detailed_
:
528 set_struct_debug_option (&global_options
, loc
, arg
);
531 case OPT_fext_numeric_literals
:
532 cpp_opts
->ext_numeric_literals
= value
;
536 add_path (xstrdup (arg
), AFTER
, 0, true);
541 defer_opt (code
, arg
);
553 add_path (xstrdup (arg
), QUOTE
, 0, true);
561 add_path (xstrdup (arg
), SYSTEM
, 0, true);
564 case OPT_iwithprefix
:
565 add_prefixed_path (arg
, SYSTEM
);
568 case OPT_iwithprefixbefore
:
569 add_prefixed_path (arg
, BRACKET
);
573 cpp_set_lang (parse_in
, CLK_ASM
);
574 cpp_opts
->dollars_in_ident
= false;
589 error ("output filename specified twice");
592 case OPT_print_objc_runtime_info
:
593 print_struct_values
= 1;
601 case OPT_std_gnu__98
:
602 if (!preprocessing_asm_p
)
603 set_std_cxx98 (code
== OPT_std_c__98
/* ISO */);
607 case OPT_std_gnu__11
:
608 if (!preprocessing_asm_p
)
610 set_std_cxx11 (code
== OPT_std_c__11
/* ISO */);
611 if (code
== OPT_std_c__11
)
612 cpp_opts
->ext_numeric_literals
= 0;
617 case OPT_std_gnu__14
:
618 if (!preprocessing_asm_p
)
620 set_std_cxx14 (code
== OPT_std_c__14
/* ISO */);
621 if (code
== OPT_std_c__14
)
622 cpp_opts
->ext_numeric_literals
= 0;
627 case OPT_std_gnu__1z
:
628 if (!preprocessing_asm_p
)
630 set_std_cxx1z (code
== OPT_std_c__1z
/* ISO */);
631 if (code
== OPT_std_c__1z
)
632 cpp_opts
->ext_numeric_literals
= 0;
637 case OPT_std_iso9899_199409
:
638 if (!preprocessing_asm_p
)
639 set_std_c89 (code
== OPT_std_iso9899_199409
/* c94 */, true /* ISO */);
643 if (!preprocessing_asm_p
)
644 set_std_c89 (false /* c94 */, false /* ISO */);
648 if (!preprocessing_asm_p
)
649 set_std_c99 (true /* ISO */);
653 if (!preprocessing_asm_p
)
654 set_std_c99 (false /* ISO */);
658 if (!preprocessing_asm_p
)
659 set_std_c11 (true /* ISO */);
663 if (!preprocessing_asm_p
)
664 set_std_c11 (false /* ISO */);
668 cpp_opts
->trigraphs
= 1;
671 case OPT_traditional_cpp
:
672 cpp_opts
->traditional
= 1;
683 C_handle_option_auto (&global_options
, &global_options_set
,
685 c_family_lang_mask
, kind
,
686 loc
, handlers
, global_dc
);
690 ObjC_handle_option_auto (&global_options
, &global_options_set
,
692 c_family_lang_mask
, kind
,
693 loc
, handlers
, global_dc
);
697 CXX_handle_option_auto (&global_options
, &global_options_set
,
699 c_family_lang_mask
, kind
,
700 loc
, handlers
, global_dc
);
704 ObjCXX_handle_option_auto (&global_options
, &global_options_set
,
706 c_family_lang_mask
, kind
,
707 loc
, handlers
, global_dc
);
714 cpp_handle_option_auto (&global_options
, scode
, cpp_opts
);
718 /* Default implementation of TARGET_HANDLE_C_OPTION. */
721 default_handle_c_option (size_t code ATTRIBUTE_UNUSED
,
722 const char *arg ATTRIBUTE_UNUSED
,
723 int value ATTRIBUTE_UNUSED
)
728 /* Post-switch processing. */
730 c_common_post_options (const char **pfilename
)
732 struct cpp_callbacks
*cb
;
734 /* Canonicalize the input and output filenames. */
735 if (in_fnames
== NULL
)
737 in_fnames
= XNEWVEC (const char *, 1);
740 else if (strcmp (in_fnames
[0], "-") == 0)
743 if (out_fname
== NULL
|| !strcmp (out_fname
, "-"))
746 if (cpp_opts
->deps
.style
== DEPS_NONE
)
747 check_deps_environment_vars ();
749 handle_deferred_opts ();
751 sanitize_cpp_opts ();
753 register_include_chains (parse_in
, sysroot
, iprefix
, imultilib
,
754 std_inc
, std_cxx_inc
&& c_dialect_cxx (), verbose
);
756 #ifdef C_COMMON_OVERRIDE_OPTIONS
757 /* Some machines may reject certain combinations of C
758 language-specific options. */
759 C_COMMON_OVERRIDE_OPTIONS
;
762 /* Excess precision other than "fast" requires front-end
764 if (c_dialect_cxx ())
766 if (flag_excess_precision_cmdline
== EXCESS_PRECISION_STANDARD
767 && TARGET_FLT_EVAL_METHOD_NON_DEFAULT
)
768 sorry ("-fexcess-precision=standard for C++");
769 flag_excess_precision_cmdline
= EXCESS_PRECISION_FAST
;
771 else if (flag_excess_precision_cmdline
== EXCESS_PRECISION_DEFAULT
)
772 flag_excess_precision_cmdline
= (flag_iso
773 ? EXCESS_PRECISION_STANDARD
774 : EXCESS_PRECISION_FAST
);
776 /* ISO C restricts floating-point expression contraction to within
777 source-language expressions (-ffp-contract=on, currently an alias
778 for -ffp-contract=off). */
781 && (global_options_set
.x_flag_fp_contract_mode
782 == (enum fp_contract_mode
) 0)
783 && flag_unsafe_math_optimizations
== 0)
784 flag_fp_contract_mode
= FP_CONTRACT_OFF
;
786 /* By default we use C99 inline semantics in GNU99 or C99 mode. C99
787 inline semantics are not supported in GNU89 or C89 mode. */
788 if (flag_gnu89_inline
== -1)
789 flag_gnu89_inline
= !flag_isoc99
;
790 else if (!flag_gnu89_inline
&& !flag_isoc99
)
791 error ("-fno-gnu89-inline is only supported in GNU99 or C99 mode");
793 /* Default to ObjC sjlj exception handling if NeXT runtime. */
794 if (flag_objc_sjlj_exceptions
< 0)
795 flag_objc_sjlj_exceptions
= flag_next_runtime
;
796 if (flag_objc_exceptions
&& !flag_objc_sjlj_exceptions
)
799 /* If -ffreestanding, -fno-hosted or -fno-builtin then disable
800 pattern recognition. */
801 if (!global_options_set
.x_flag_tree_loop_distribute_patterns
803 flag_tree_loop_distribute_patterns
= 0;
805 /* Set C++ standard to C++14 if not specified on the command line. */
806 if (c_dialect_cxx () && cxx_dialect
== cxx_unset
)
807 set_std_cxx14 (/*ISO*/false);
809 /* -Woverlength-strings is off by default, but is enabled by -Wpedantic.
810 It is never enabled in C++, as the minimum limit is not normative
812 if (c_dialect_cxx ())
813 warn_overlength_strings
= 0;
815 /* Wmain is enabled by default in C++ but not in C. */
816 /* Wmain is disabled by default for -ffreestanding (!flag_hosted),
817 even if -Wall or -Wpedantic was given (warn_main will be 2 if set
818 by -Wall, 1 if set by -Wmain). */
820 warn_main
= (c_dialect_cxx () && flag_hosted
) ? 1 : 0;
821 else if (warn_main
== 2)
822 warn_main
= flag_hosted
? 1 : 0;
824 /* In C, -Wall and -Wc++-compat enable -Wenum-compare; if it has not
825 yet been set, it is disabled by default. In C++, it is enabled
827 if (warn_enum_compare
== -1)
828 warn_enum_compare
= c_dialect_cxx () ? 1 : 0;
830 /* -Wpacked-bitfield-compat is on by default for the C languages. The
831 warning is issued in stor-layout.c which is not part of the front-end so
832 we need to selectively turn it on here. */
833 if (warn_packed_bitfield_compat
== -1)
834 warn_packed_bitfield_compat
= 1;
836 /* Special format checking options don't work without -Wformat; warn if
840 warning (OPT_Wformat_y2k
,
841 "-Wformat-y2k ignored without -Wformat");
842 warning (OPT_Wformat_extra_args
,
843 "-Wformat-extra-args ignored without -Wformat");
844 warning (OPT_Wformat_zero_length
,
845 "-Wformat-zero-length ignored without -Wformat");
846 warning (OPT_Wformat_nonliteral
,
847 "-Wformat-nonliteral ignored without -Wformat");
848 warning (OPT_Wformat_contains_nul
,
849 "-Wformat-contains-nul ignored without -Wformat");
850 warning (OPT_Wformat_security
,
851 "-Wformat-security ignored without -Wformat");
854 /* -Wimplicit-function-declaration is enabled by default for C99. */
855 if (warn_implicit_function_declaration
== -1)
856 warn_implicit_function_declaration
= flag_isoc99
;
858 /* -Wimplicit-int is enabled by default for C99. */
859 if (warn_implicit_int
== -1)
860 warn_implicit_int
= flag_isoc99
;
862 /* -Wshift-overflow is enabled by default in C99 and C++11 modes. */
863 if (warn_shift_overflow
== -1)
864 warn_shift_overflow
= cxx_dialect
>= cxx11
|| flag_isoc99
;
866 /* -Wshift-negative-value is enabled by -Wextra in C99 and C++11 modes. */
867 if (warn_shift_negative_value
== -1)
868 warn_shift_negative_value
= (extra_warnings
869 && (cxx_dialect
>= cxx11
|| flag_isoc99
));
871 /* Declone C++ 'structors if -Os. */
872 if (flag_declone_ctor_dtor
== -1)
873 flag_declone_ctor_dtor
= optimize_size
;
875 if (warn_abi_version
== -1)
877 if (flag_abi_compat_version
!= -1)
878 warn_abi_version
= flag_abi_compat_version
;
880 warn_abi_version
= 0;
883 if (flag_abi_compat_version
== 1)
885 warning (0, "%<-fabi-compat-version=1%> is not supported, using =2");
886 flag_abi_compat_version
= 2;
888 else if (flag_abi_compat_version
== -1)
890 /* Generate compatibility aliases for ABI v8 (5.1) by default. */
891 flag_abi_compat_version
892 = (flag_abi_version
== 0 ? 8 : 0);
895 /* Change flag_abi_version to be the actual current ABI level for the
896 benefit of c_cpp_builtins. */
897 if (flag_abi_version
== 0)
898 flag_abi_version
= 10;
900 if (cxx_dialect
>= cxx11
)
902 /* If we're allowing C++0x constructs, don't warn about C++98
903 identifiers which are keywords in C++0x. */
904 warn_cxx11_compat
= 0;
905 cpp_opts
->cpp_warn_cxx11_compat
= 0;
907 if (warn_narrowing
== -1)
910 else if (warn_narrowing
== -1)
913 /* Global sized deallocation is new in C++14. */
914 if (flag_sized_deallocation
== -1)
915 flag_sized_deallocation
= (cxx_dialect
>= cxx14
);
917 if (flag_extern_tls_init
)
919 #if !defined (ASM_OUTPUT_DEF) || !SUPPORTS_WEAK
920 /* Lazy TLS initialization for a variable in another TU requires
921 alias and weak reference support. */
922 if (flag_extern_tls_init
> 0)
923 sorry ("external TLS initialization functions not supported "
925 flag_extern_tls_init
= 0;
927 flag_extern_tls_init
= 1;
931 if (flag_preprocess_only
)
933 /* Open the output now. We must do so even if flag_no_output is
934 on, because there may be other output than from the actual
935 preprocessing (e.g. from -dM). */
936 if (out_fname
[0] == '\0')
939 out_stream
= fopen (out_fname
, "w");
941 if (out_stream
== NULL
)
943 fatal_error (input_location
, "opening output file %s: %m", out_fname
);
947 if (num_in_fnames
> 1)
948 error ("too many filenames given. Type %s --help for usage",
951 init_pp_output (out_stream
);
957 /* When writing a PCH file, avoid reading some other PCH file,
958 because the default address space slot then can't be used
959 for the output PCH file. */
962 c_common_no_more_pch ();
963 /* Only -g0 and -gdwarf* are supported with PCH, for other
964 debug formats we warn here and refuse to load any PCH files. */
965 if (write_symbols
!= NO_DEBUG
&& write_symbols
!= DWARF2_DEBUG
)
966 warning (OPT_Wdeprecated
,
967 "the \"%s\" debug format cannot be used with "
968 "pre-compiled headers", debug_type_names
[write_symbols
]);
970 else if (write_symbols
!= NO_DEBUG
&& write_symbols
!= DWARF2_DEBUG
)
971 c_common_no_more_pch ();
973 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
974 input_location
= UNKNOWN_LOCATION
;
977 cb
= cpp_get_callbacks (parse_in
);
978 cb
->file_change
= cb_file_change
;
979 cb
->dir_change
= cb_dir_change
;
980 cpp_post_options (parse_in
);
981 init_global_opts_from_cpp (&global_options
, cpp_get_options (parse_in
));
983 input_location
= UNKNOWN_LOCATION
;
985 *pfilename
= this_input_filename
986 = cpp_read_main_file (parse_in
, in_fnames
[0]);
987 /* Don't do any compilation or preprocessing if there is no input file. */
988 if (this_input_filename
== NULL
)
994 if (flag_working_directory
995 && flag_preprocess_only
&& !flag_no_line_commands
)
996 pp_dir_change (parse_in
, get_src_pwd ());
998 /* Disable LTO output when outputting a precompiled header. */
999 if (pch_file
&& flag_lto
)
1002 flag_generate_lto
= 0;
1005 return flag_preprocess_only
;
1008 /* Front end initialization common to C, ObjC and C++. */
1010 c_common_init (void)
1012 /* Set up preprocessor arithmetic. Must be done after call to
1013 c_common_nodes_and_builtins for type nodes to be good. */
1014 cpp_opts
->precision
= TYPE_PRECISION (intmax_type_node
);
1015 cpp_opts
->char_precision
= TYPE_PRECISION (char_type_node
);
1016 cpp_opts
->int_precision
= TYPE_PRECISION (integer_type_node
);
1017 cpp_opts
->wchar_precision
= TYPE_PRECISION (wchar_type_node
);
1018 cpp_opts
->unsigned_wchar
= TYPE_UNSIGNED (wchar_type_node
);
1019 cpp_opts
->bytes_big_endian
= BYTES_BIG_ENDIAN
;
1021 /* This can't happen until after wchar_precision and bytes_big_endian
1023 cpp_init_iconv (parse_in
);
1028 fputs ("Compiler executable checksum: ", stderr
);
1029 for (i
= 0; i
< 16; i
++)
1030 fprintf (stderr
, "%02x", executable_checksum
[i
]);
1031 putc ('\n', stderr
);
1034 /* Has to wait until now so that cpplib has its hash table. */
1037 if (flag_preprocess_only
)
1039 c_finish_options ();
1040 preprocess_file (parse_in
);
1047 /* Initialize the integrated preprocessor after debug output has been
1048 initialized; loop over each input file. */
1050 c_common_parse_file (void)
1057 c_finish_options ();
1058 /* Open the dump files to use for the original and class dump output
1059 here, to be used during parsing for the current file. */
1060 original_dump_file
= dump_begin (TDI_original
, &original_dump_flags
);
1061 class_dump_file
= dump_begin (TDI_class
, &class_dump_flags
);
1066 /* And end the main input file, if the debug writer wants it */
1067 if (debug_hooks
->start_end_main_source_file
)
1068 (*debug_hooks
->end_source_file
) (0);
1069 if (++i
>= num_in_fnames
)
1071 cpp_undef_all (parse_in
);
1072 cpp_clear_file_cache (parse_in
);
1074 = cpp_read_main_file (parse_in
, in_fnames
[i
]);
1075 if (original_dump_file
)
1077 dump_end (TDI_original
, original_dump_file
);
1078 original_dump_file
= NULL
;
1080 if (class_dump_file
)
1082 dump_end (TDI_class
, class_dump_file
);
1083 class_dump_file
= NULL
;
1085 /* If an input file is missing, abandon further compilation.
1086 cpplib has issued a diagnostic. */
1087 if (!this_input_filename
)
1091 c_parse_final_cleanups ();
1094 /* Returns the appropriate dump file for PHASE to dump with FLAGS. */
1096 get_dump_info (int phase
, int *flags
)
1098 gcc_assert (phase
== TDI_original
|| phase
== TDI_class
);
1099 if (phase
== TDI_original
)
1101 *flags
= original_dump_flags
;
1102 return original_dump_file
;
1106 *flags
= class_dump_flags
;
1107 return class_dump_file
;
1111 /* Common finish hook for the C, ObjC and C++ front ends. */
1113 c_common_finish (void)
1115 FILE *deps_stream
= NULL
;
1117 /* Don't write the deps file if there are errors. */
1118 if (cpp_opts
->deps
.style
!= DEPS_NONE
&& !seen_error ())
1120 /* If -M or -MM was seen without -MF, default output to the
1123 deps_stream
= out_stream
;
1126 deps_stream
= fopen (deps_file
, deps_append
? "a": "w");
1128 fatal_error (input_location
, "opening dependency file %s: %m",
1133 /* For performance, avoid tearing down cpplib's internal structures
1134 with cpp_destroy (). */
1135 cpp_finish (parse_in
, deps_stream
);
1137 if (deps_stream
&& deps_stream
!= out_stream
1138 && (ferror (deps_stream
) || fclose (deps_stream
)))
1139 fatal_error (input_location
, "closing dependency file %s: %m", deps_file
);
1141 if (out_stream
&& (ferror (out_stream
) || fclose (out_stream
)))
1142 fatal_error (input_location
, "when writing output to %s: %m", out_fname
);
1145 /* Either of two environment variables can specify output of
1146 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1147 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1148 and DEPS_TARGET is the target to mention in the deps. They also
1149 result in dependency information being appended to the output file
1150 rather than overwriting it, and like Sun's compiler
1151 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1153 check_deps_environment_vars (void)
1157 spec
= getenv ("DEPENDENCIES_OUTPUT");
1159 cpp_opts
->deps
.style
= DEPS_USER
;
1162 spec
= getenv ("SUNPRO_DEPENDENCIES");
1165 cpp_opts
->deps
.style
= DEPS_SYSTEM
;
1166 cpp_opts
->deps
.ignore_main_file
= true;
1172 /* Find the space before the DEPS_TARGET, if there is one. */
1173 char *s
= strchr (spec
, ' ');
1176 /* Let the caller perform MAKE quoting. */
1177 defer_opt (OPT_MT
, s
+ 1);
1181 /* Command line -MF overrides environment variables and default. */
1190 /* Handle deferred command line switches. */
1192 handle_deferred_opts (void)
1197 /* Avoid allocating the deps buffer if we don't need it.
1198 (This flag may be true without there having been -MT or -MQ
1199 options, but we'll still need the deps buffer.) */
1203 deps
= cpp_get_deps (parse_in
);
1205 for (i
= 0; i
< deferred_count
; i
++)
1207 struct deferred_opt
*opt
= &deferred_opts
[i
];
1209 if (opt
->code
== OPT_MT
|| opt
->code
== OPT_MQ
)
1210 deps_add_target (deps
, opt
->arg
, opt
->code
== OPT_MQ
);
1214 /* These settings are appropriate for GCC, but not necessarily so for
1215 cpplib as a library. */
1217 sanitize_cpp_opts (void)
1219 /* If we don't know what style of dependencies to output, complain
1220 if any other dependency switches have been given. */
1221 if (deps_seen
&& cpp_opts
->deps
.style
== DEPS_NONE
)
1222 error ("to generate dependencies you must specify either -M or -MM");
1224 /* -dM and dependencies suppress normal output; do it here so that
1225 the last -d[MDN] switch overrides earlier ones. */
1226 if (flag_dump_macros
== 'M')
1229 /* By default, -fdirectives-only implies -dD. This allows subsequent phases
1230 to perform proper macro expansion. */
1231 if (cpp_opts
->directives_only
&& !cpp_opts
->preprocessed
&& !flag_dump_macros
)
1232 flag_dump_macros
= 'D';
1234 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1235 -dM since at least glibc relies on -M -dM to work. */
1236 /* Also, flag_no_output implies flag_no_line_commands, always. */
1239 if (flag_dump_macros
!= 'M')
1240 flag_dump_macros
= 0;
1241 flag_dump_includes
= 0;
1242 flag_no_line_commands
= 1;
1244 else if (cpp_opts
->deps
.missing_files
)
1245 error ("-MG may only be used with -M or -MM");
1247 cpp_opts
->unsigned_char
= !flag_signed_char
;
1248 cpp_opts
->stdc_0_in_system_headers
= STDC_0_IN_SYSTEM_HEADERS
;
1250 /* Wlong-long is disabled by default. It is enabled by:
1251 [-Wpedantic | -Wtraditional] -std=[gnu|c]++98 ; or
1252 [-Wpedantic | -Wtraditional] -std=non-c99
1254 Either -Wlong-long or -Wno-long-long override any other settings.
1255 ??? These conditions should be handled in c.opt. */
1256 if (warn_long_long
== -1)
1258 warn_long_long
= ((pedantic
|| warn_traditional
)
1259 && (c_dialect_cxx () ? cxx_dialect
== cxx98
: !flag_isoc99
));
1260 cpp_opts
->cpp_warn_long_long
= warn_long_long
;
1263 /* If we're generating preprocessor output, emit current directory
1264 if explicitly requested or if debugging information is enabled.
1265 ??? Maybe we should only do it for debugging formats that
1266 actually output the current directory? */
1267 if (flag_working_directory
== -1)
1268 flag_working_directory
= (debug_info_level
!= DINFO_LEVEL_NONE
);
1270 if (cpp_opts
->directives_only
)
1272 if (cpp_warn_unused_macros
)
1273 error ("-fdirectives-only is incompatible with -Wunused_macros");
1274 if (cpp_opts
->traditional
)
1275 error ("-fdirectives-only is incompatible with -traditional");
1279 /* Add include path with a prefix at the front of its name. */
1281 add_prefixed_path (const char *suffix
, size_t chain
)
1285 size_t prefix_len
, suffix_len
;
1287 suffix_len
= strlen (suffix
);
1288 prefix
= iprefix
? iprefix
: cpp_GCC_INCLUDE_DIR
;
1289 prefix_len
= iprefix
? strlen (iprefix
) : cpp_GCC_INCLUDE_DIR_len
;
1291 path
= (char *) xmalloc (prefix_len
+ suffix_len
+ 1);
1292 memcpy (path
, prefix
, prefix_len
);
1293 memcpy (path
+ prefix_len
, suffix
, suffix_len
);
1294 path
[prefix_len
+ suffix_len
] = '\0';
1296 add_path (path
, chain
, 0, false);
1299 /* Handle -D, -U, -A, -imacros, and the first -include. */
1301 c_finish_options (void)
1303 if (!cpp_opts
->preprocessed
)
1307 cb_file_change (parse_in
,
1308 linemap_check_ordinary (linemap_add (line_table
,
1312 /* Make sure all of the builtins about to be declared have
1313 BUILTINS_LOCATION has their source_location. */
1314 source_location builtins_loc
= BUILTINS_LOCATION
;
1315 cpp_force_token_locations (parse_in
, &builtins_loc
);
1317 cpp_init_builtins (parse_in
, flag_hosted
);
1318 c_cpp_builtins (parse_in
);
1320 cpp_stop_forcing_token_locations (parse_in
);
1322 /* We're about to send user input to cpplib, so make it warn for
1323 things that we previously (when we sent it internal definitions)
1324 told it to not warn.
1326 C99 permits implementation-defined characters in identifiers.
1327 The documented meaning of -std= is to turn off extensions that
1328 conflict with the specified standard, and since a strictly
1329 conforming program cannot contain a '$', we do not condition
1330 their acceptance on the -std= setting. */
1331 cpp_opts
->warn_dollars
= (cpp_opts
->cpp_pedantic
&& !cpp_opts
->c99
);
1333 cb_file_change (parse_in
,
1334 linemap_check_ordinary (linemap_add (line_table
, LC_RENAME
, 0,
1335 _("<command-line>"), 0)));
1337 for (i
= 0; i
< deferred_count
; i
++)
1339 struct deferred_opt
*opt
= &deferred_opts
[i
];
1341 if (opt
->code
== OPT_D
)
1342 cpp_define (parse_in
, opt
->arg
);
1343 else if (opt
->code
== OPT_U
)
1344 cpp_undef (parse_in
, opt
->arg
);
1345 else if (opt
->code
== OPT_A
)
1347 if (opt
->arg
[0] == '-')
1348 cpp_unassert (parse_in
, opt
->arg
+ 1);
1350 cpp_assert (parse_in
, opt
->arg
);
1354 /* Start the main input file, if the debug writer wants it. */
1355 if (debug_hooks
->start_end_main_source_file
1356 && !flag_preprocess_only
)
1357 (*debug_hooks
->start_source_file
) (0, this_input_filename
);
1359 /* Handle -imacros after -D and -U. */
1360 for (i
= 0; i
< deferred_count
; i
++)
1362 struct deferred_opt
*opt
= &deferred_opts
[i
];
1364 if (opt
->code
== OPT_imacros
1365 && cpp_push_include (parse_in
, opt
->arg
))
1367 /* Disable push_command_line_include callback for now. */
1368 include_cursor
= deferred_count
+ 1;
1369 cpp_scan_nooutput (parse_in
);
1375 if (cpp_opts
->directives_only
)
1376 cpp_init_special_builtins (parse_in
);
1378 /* Start the main input file, if the debug writer wants it. */
1379 if (debug_hooks
->start_end_main_source_file
1380 && !flag_preprocess_only
)
1381 (*debug_hooks
->start_source_file
) (0, this_input_filename
);
1385 push_command_line_include ();
1388 /* Give CPP the next file given by -include, if any. */
1390 push_command_line_include (void)
1392 /* This can happen if disabled by -imacros for example.
1393 Punt so that we don't set "<command-line>" as the filename for
1395 if (include_cursor
> deferred_count
)
1398 if (!done_preinclude
)
1400 done_preinclude
= true;
1401 if (flag_hosted
&& std_inc
&& !cpp_opts
->preprocessed
)
1403 const char *preinc
= targetcm
.c_preinclude ();
1404 if (preinc
&& cpp_push_default_include (parse_in
, preinc
))
1409 pch_cpp_save_state ();
1411 while (include_cursor
< deferred_count
)
1413 struct deferred_opt
*opt
= &deferred_opts
[include_cursor
++];
1415 if (!cpp_opts
->preprocessed
&& opt
->code
== OPT_include
1416 && cpp_push_include (parse_in
, opt
->arg
))
1420 if (include_cursor
== deferred_count
)
1423 /* -Wunused-macros should only warn about macros defined hereafter. */
1424 cpp_opts
->warn_unused_macros
= cpp_warn_unused_macros
;
1425 /* Restore the line map from <command line>. */
1426 if (!cpp_opts
->preprocessed
)
1427 cpp_change_file (parse_in
, LC_RENAME
, this_input_filename
);
1429 /* Set this here so the client can change the option if it wishes,
1430 and after stacking the main file so we don't trace the main file. */
1431 line_table
->trace_includes
= cpp_opts
->print_include_names
;
1435 /* File change callback. Has to handle -include files. */
1437 cb_file_change (cpp_reader
* ARG_UNUSED (pfile
),
1438 const line_map_ordinary
*new_map
)
1440 if (flag_preprocess_only
)
1441 pp_file_change (new_map
);
1443 fe_file_change (new_map
);
1446 && (new_map
->reason
== LC_ENTER
|| new_map
->reason
== LC_RENAME
))
1448 /* Signal to plugins that a file is included. This could happen
1449 several times with the same file path, e.g. because of
1450 several '#include' or '#line' directives... */
1451 invoke_plugin_callbacks
1452 (PLUGIN_INCLUDE_FILE
,
1453 const_cast<char*> (ORDINARY_MAP_FILE_NAME (new_map
)));
1456 if (new_map
== 0 || (new_map
->reason
== LC_LEAVE
&& MAIN_FILE_P (new_map
)))
1458 pch_cpp_save_state ();
1459 push_command_line_include ();
1464 cb_dir_change (cpp_reader
* ARG_UNUSED (pfile
), const char *dir
)
1466 if (!set_src_pwd (dir
))
1467 warning (0, "too late for # directive to set debug directory");
1470 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1471 extensions if ISO). There is no concept of gnu94. */
1473 set_std_c89 (int c94
, int iso
)
1475 cpp_set_lang (parse_in
, c94
? CLK_STDC94
: iso
? CLK_STDC89
: CLK_GNUC89
);
1478 flag_no_gnu_keywords
= iso
;
1479 flag_no_nonansi_builtin
= iso
;
1483 lang_hooks
.name
= "GNU C89";
1486 /* Set the C 99 standard (without GNU extensions if ISO). */
1488 set_std_c99 (int iso
)
1490 cpp_set_lang (parse_in
, iso
? CLK_STDC99
: CLK_GNUC99
);
1492 flag_no_nonansi_builtin
= iso
;
1497 lang_hooks
.name
= "GNU C99";
1500 /* Set the C 11 standard (without GNU extensions if ISO). */
1502 set_std_c11 (int iso
)
1504 cpp_set_lang (parse_in
, iso
? CLK_STDC11
: CLK_GNUC11
);
1506 flag_no_nonansi_builtin
= iso
;
1511 lang_hooks
.name
= "GNU C11";
1514 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1516 set_std_cxx98 (int iso
)
1518 cpp_set_lang (parse_in
, iso
? CLK_CXX98
: CLK_GNUCXX
);
1519 flag_no_gnu_keywords
= iso
;
1520 flag_no_nonansi_builtin
= iso
;
1522 cxx_dialect
= cxx98
;
1523 lang_hooks
.name
= "GNU C++98";
1526 /* Set the C++ 2011 standard (without GNU extensions if ISO). */
1528 set_std_cxx11 (int iso
)
1530 cpp_set_lang (parse_in
, iso
? CLK_CXX11
: CLK_GNUCXX11
);
1531 flag_no_gnu_keywords
= iso
;
1532 flag_no_nonansi_builtin
= iso
;
1534 /* C++11 includes the C99 standard library. */
1537 cxx_dialect
= cxx11
;
1538 lang_hooks
.name
= "GNU C++11";
1541 /* Set the C++ 2014 draft standard (without GNU extensions if ISO). */
1543 set_std_cxx14 (int iso
)
1545 cpp_set_lang (parse_in
, iso
? CLK_CXX14
: CLK_GNUCXX14
);
1546 flag_no_gnu_keywords
= iso
;
1547 flag_no_nonansi_builtin
= iso
;
1549 /* C++11 includes the C99 standard library. */
1552 cxx_dialect
= cxx14
;
1553 lang_hooks
.name
= "GNU C++14";
1556 /* Set the C++ 201z draft standard (without GNU extensions if ISO). */
1558 set_std_cxx1z (int iso
)
1560 cpp_set_lang (parse_in
, iso
? CLK_CXX1Z
: CLK_GNUCXX1Z
);
1561 flag_no_gnu_keywords
= iso
;
1562 flag_no_nonansi_builtin
= iso
;
1564 /* C++11 includes the C99 standard library. */
1567 /* Enable concepts by default. */
1570 cxx_dialect
= cxx1z
;
1571 lang_hooks
.name
= "GNU C++14"; /* Pretend C++14 till standarization. */
1574 /* Args to -d specify what to dump. Silently ignore
1575 unrecognized options; they may be aimed at toplev.c. */
1577 handle_OPT_d (const char *arg
)
1581 while ((c
= *arg
++) != '\0')
1584 case 'M': /* Dump macros only. */
1585 case 'N': /* Dump names. */
1586 case 'D': /* Dump definitions. */
1587 case 'U': /* Dump used macros. */
1588 flag_dump_macros
= c
;
1592 flag_dump_includes
= 1;