1 /* C/ObjC/C++ command line option handling.
2 Copyright (C) 2002-2013 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"
30 #include "langhooks.h"
31 #include "diagnostic.h"
33 #include "cppdefault.h"
35 #include "debug.h" /* For debug_hooks. */
40 #include "tm.h" /* For BYTES_BIG_ENDIAN,
41 DOLLARS_IN_IDENTIFIERS,
42 STDC_0_IN_SYSTEM_HEADERS,
43 TARGET_FLT_EVAL_METHOD_NON_DEFAULT and
45 #include "tm_p.h" /* For C_COMMON_OVERRIDE_OPTIONS. */
47 #ifndef DOLLARS_IN_IDENTIFIERS
48 # define DOLLARS_IN_IDENTIFIERS true
51 #ifndef TARGET_SYSTEM_ROOT
52 # define TARGET_SYSTEM_ROOT NULL
56 #define TARGET_OPTF(ARG)
60 cpp_options
*cpp_opts
;
63 static const char *this_input_filename
;
65 /* Filename and stream for preprocessed output. */
66 static const char *out_fname
;
67 static FILE *out_stream
;
69 /* Append dependencies to deps_file. */
70 static bool deps_append
;
72 /* If dependency switches (-MF etc.) have been given. */
73 static bool deps_seen
;
78 /* Dependency output file. */
79 static const char *deps_file
;
81 /* The prefix given by -iprefix, if any. */
82 static const char *iprefix
;
84 /* The multilib directory given by -imultilib, if any. */
85 static const char *imultilib
;
87 /* The system root, if any. Overridden by -isysroot. */
88 static const char *sysroot
= TARGET_SYSTEM_ROOT
;
90 /* Zero disables all standard directories for headers. */
91 static bool std_inc
= true;
93 /* Zero disables the C++-specific standard directories for headers. */
94 static bool std_cxx_inc
= true;
96 /* If the quote chain has been split by -I-. */
97 static bool quote_chain_split
;
99 /* Number of deferred options. */
100 static size_t deferred_count
;
102 /* Number of deferred options scanned for -include. */
103 static size_t include_cursor
;
105 /* Whether any standard preincluded header has been preincluded. */
106 static bool done_preinclude
;
108 static void handle_OPT_d (const char *);
109 static void set_std_cxx98 (int);
110 static void set_std_cxx11 (int);
111 static void set_std_cxx1y (int);
112 static void set_std_c89 (int, int);
113 static void set_std_c99 (int);
114 static void set_std_c11 (int);
115 static void check_deps_environment_vars (void);
116 static void handle_deferred_opts (void);
117 static void sanitize_cpp_opts (void);
118 static void add_prefixed_path (const char *, size_t);
119 static void push_command_line_include (void);
120 static void cb_file_change (cpp_reader
*, const struct line_map
*);
121 static void cb_dir_change (cpp_reader
*, const char *);
122 static void c_finish_options (void);
124 #ifndef STDC_0_IN_SYSTEM_HEADERS
125 #define STDC_0_IN_SYSTEM_HEADERS 0
128 /* Holds switches parsed by c_common_handle_option (), but whose
129 handling is deferred to c_common_post_options (). */
130 static void defer_opt (enum opt_code
, const char *);
131 static struct deferred_opt
138 extern const unsigned int
139 c_family_lang_mask
= (CL_C
| CL_CXX
| CL_UPC
| CL_ObjC
| CL_ObjCXX
);
141 /* Defer option CODE with argument ARG. */
143 defer_opt (enum opt_code code
, const char *arg
)
145 deferred_opts
[deferred_count
].code
= code
;
146 deferred_opts
[deferred_count
].arg
= arg
;
150 /* Return language mask for option parsing. */
152 c_common_option_lang_mask (void)
154 static const unsigned int
155 lang_flags
[] = {CL_C
, CL_ObjC
, CL_CXX
, CL_ObjCXX
, CL_UPC
};
156 return lang_flags
[c_language
];
159 /* Common diagnostics initialization. */
161 c_common_initialize_diagnostics (diagnostic_context
*context
)
163 /* This is conditionalized only because that is the way the front
164 ends used to do it. Maybe this should be unconditional? */
165 if (c_dialect_cxx ())
167 /* By default wrap lines at 80 characters. Is getenv
168 ("COLUMNS") preferable? */
169 diagnostic_line_cutoff (context
) = 80;
170 /* By default, emit location information once for every
171 diagnostic message. */
172 diagnostic_prefixing_rule (context
) = DIAGNOSTICS_SHOW_PREFIX_ONCE
;
175 context
->opt_permissive
= OPT_fpermissive
;
178 /* Whether options from all C-family languages should be accepted
180 static bool accept_all_c_family_options
= false;
182 /* Return whether to complain about a wrong-language option. */
184 c_common_complain_wrong_lang_p (const struct cl_option
*option
)
186 if (accept_all_c_family_options
187 && (option
->flags
& c_family_lang_mask
))
193 /* Initialize options structure OPTS. */
195 c_common_init_options_struct (struct gcc_options
*opts
)
197 opts
->x_flag_exceptions
= c_dialect_cxx ();
198 opts
->x_warn_pointer_arith
= c_dialect_cxx ();
199 opts
->x_warn_write_strings
= c_dialect_cxx ();
200 opts
->x_flag_warn_unused_result
= true;
202 /* By default, C99-like requirements for complex multiply and divide. */
203 opts
->x_flag_complex_method
= 2;
206 /* Common initialization before calling option handlers. */
208 c_common_init_options (unsigned int decoded_options_count
,
209 struct cl_decoded_option
*decoded_options
)
212 struct cpp_callbacks
*cb
;
214 parse_in
= cpp_create_reader (c_dialect_cxx () ? CLK_GNUCXX
: CLK_GNUC89
,
215 ident_hash
, line_table
);
216 cb
= cpp_get_callbacks (parse_in
);
217 cb
->error
= c_cpp_error
;
219 cpp_opts
= cpp_get_options (parse_in
);
220 cpp_opts
->dollars_in_ident
= DOLLARS_IN_IDENTIFIERS
;
221 cpp_opts
->objc
= c_dialect_objc ();
223 /* Reset to avoid warnings on internal definitions. We set it just
224 before passing on command-line options to cpplib. */
225 cpp_opts
->warn_dollars
= 0;
227 deferred_opts
= XNEWVEC (struct deferred_opt
, decoded_options_count
);
229 if (c_language
== clk_c
)
231 /* If preprocessing assembly language, accept any of the C-family
232 front end options since the driver may pass them through. */
233 for (i
= 1; i
< decoded_options_count
; i
++)
234 if (decoded_options
[i
].opt_index
== OPT_lang_asm
)
236 accept_all_c_family_options
= true;
242 /* Handle switch SCODE with argument ARG. VALUE is true, unless no-
243 form of an -f or -W option was given. Returns false if the switch was
244 invalid, true if valid. Use HANDLERS in recursive handle_option calls. */
246 c_common_handle_option (size_t scode
, const char *arg
, int value
,
247 int kind
, location_t loc
,
248 const struct cl_option_handlers
*handlers
)
250 const struct cl_option
*option
= &cl_options
[scode
];
251 enum opt_code code
= (enum opt_code
) scode
;
254 /* Prevent resetting the language standard to a C dialect when the driver
255 has already determined that we're looking at assembler input. */
256 bool preprocessing_asm_p
= (cpp_get_options (parse_in
)->lang
== CLK_ASM
);
261 if (cl_options
[code
].flags
& c_family_lang_mask
)
263 if ((option
->flags
& CL_TARGET
)
264 && ! targetcm
.handle_c_option (scode
, arg
, value
))
271 case OPT__output_pch_
:
276 defer_opt (code
, arg
);
280 cpp_opts
->discard_comments
= 0;
284 cpp_opts
->discard_comments
= 0;
285 cpp_opts
->discard_comments_in_macro_exp
= 0;
289 defer_opt (code
, arg
);
293 cpp_opts
->print_include_names
= 1;
297 TARGET_OPTF (xstrdup (arg
));
301 if (strcmp (arg
, "-"))
302 add_path (xstrdup (arg
), BRACKET
, 0, true);
305 if (quote_chain_split
)
306 error ("-I- specified twice");
307 quote_chain_split
= true;
308 split_quote_chain ();
309 inform (input_location
, "obsolete option -I- used, please use -iquote instead");
315 /* When doing dependencies with -M or -MM, suppress normal
316 preprocessed output, but still do -dM etc. as software
317 depends on this. Preprocessed output does occur if -MD, -MMD
318 or environment var dependency generation is used. */
319 cpp_opts
->deps
.style
= (code
== OPT_M
? DEPS_SYSTEM
: DEPS_USER
);
325 cpp_opts
->deps
.style
= (code
== OPT_MD
? DEPS_SYSTEM
: DEPS_USER
);
326 cpp_opts
->deps
.need_preprocessor_output
= true;
337 cpp_opts
->deps
.missing_files
= true;
342 cpp_opts
->deps
.phony_targets
= true;
348 defer_opt (code
, arg
);
352 flag_no_line_commands
= 1;
356 defer_opt (code
, arg
);
360 /* ??? Don't add new options here. Use LangEnabledBy in c.opt. */
362 cpp_opts
->warn_trigraphs
= value
;
363 cpp_opts
->warn_comments
= value
;
364 cpp_opts
->warn_num_sign_change
= value
;
367 case OPT_Wbuiltin_macro_redefined
:
368 cpp_opts
->warn_builtin_macro_redefined
= value
;
372 cpp_opts
->warn_comments
= value
;
375 case OPT_Wc___compat
:
376 cpp_opts
->warn_cxx_operator_names
= value
;
379 case OPT_Wdeprecated
:
380 cpp_opts
->cpp_warn_deprecated
= value
;
383 case OPT_Wendif_labels
:
384 cpp_opts
->warn_endif_labels
= value
;
387 case OPT_Winvalid_pch
:
388 cpp_opts
->warn_invalid_pch
= value
;
391 case OPT_Wliteral_suffix
:
392 cpp_opts
->warn_literal_suffix
= value
;
396 cpp_opts
->cpp_warn_long_long
= value
;
399 case OPT_Wmissing_include_dirs
:
400 cpp_opts
->warn_missing_include_dirs
= value
;
404 cpp_opts
->warn_multichar
= value
;
407 case OPT_Wnormalized_
:
408 if (kind
== DK_ERROR
)
411 inform (input_location
, "-Werror=normalized=: set -Wnormalized=nfc");
412 cpp_opts
->warn_normalize
= normalized_C
;
416 if (!value
|| (arg
&& strcasecmp (arg
, "none") == 0))
417 cpp_opts
->warn_normalize
= normalized_none
;
418 else if (!arg
|| strcasecmp (arg
, "nfkc") == 0)
419 cpp_opts
->warn_normalize
= normalized_KC
;
420 else if (strcasecmp (arg
, "id") == 0)
421 cpp_opts
->warn_normalize
= normalized_identifier_C
;
422 else if (strcasecmp (arg
, "nfc") == 0)
423 cpp_opts
->warn_normalize
= normalized_C
;
425 error ("argument %qs to %<-Wnormalized%> not recognized", arg
);
429 case OPT_Wtraditional
:
430 cpp_opts
->cpp_warn_traditional
= value
;
434 cpp_opts
->warn_trigraphs
= value
;
438 cpp_opts
->warn_undef
= value
;
441 case OPT_Wunknown_pragmas
:
442 /* Set to greater than 1, so that even unknown pragmas in
443 system headers will be warned about. */
444 /* ??? There is no way to handle this automatically for now. */
445 warn_unknown_pragmas
= value
* 2;
449 if (!c_dialect_cxx ())
450 set_std_c89 (false, true);
452 set_std_cxx98 (true);
459 case OPT_fcanonical_system_headers
:
460 cpp_opts
->canonical_system_headers
= value
;
463 case OPT_fcond_mismatch
:
464 if (!c_dialect_cxx ())
466 flag_cond_mismatch
= value
;
469 warning (0, "switch %qs is no longer supported", option
->opt_text
);
476 disable_builtin_function (arg
);
479 case OPT_fdirectives_only
:
480 cpp_opts
->directives_only
= value
;
483 case OPT_fdollars_in_identifiers
:
484 cpp_opts
->dollars_in_ident
= value
;
487 case OPT_ffreestanding
:
489 /* Fall through.... */
492 flag_no_builtin
= !value
;
495 case OPT_fconstant_string_class_
:
496 constant_string_class_name
= arg
;
499 case OPT_fextended_identifiers
:
500 cpp_opts
->extended_identifiers
= value
;
503 case OPT_foperator_names
:
504 cpp_opts
->operator_names
= value
;
508 cpp_opts
->restore_pch_deps
= value
;
511 case OPT_fpch_preprocess
:
512 flag_pch_preprocess
= value
;
515 case OPT_fpermissive
:
516 flag_permissive
= value
;
517 global_dc
->permissive
= value
;
520 case OPT_fpreprocessed
:
521 cpp_opts
->preprocessed
= value
;
528 case OPT_ftrack_macro_expansion
:
533 case OPT_ftrack_macro_expansion_
:
534 if (arg
&& *arg
!= '\0')
535 cpp_opts
->track_macro_expansion
= value
;
537 cpp_opts
->track_macro_expansion
= 2;
541 flag_use_repository
= value
;
543 flag_implicit_templates
= 0;
547 /* It is documented that we silently ignore silly values. */
548 if (value
>= 1 && value
<= 100)
549 cpp_opts
->tabstop
= value
;
552 case OPT_fexec_charset_
:
553 cpp_opts
->narrow_charset
= arg
;
556 case OPT_fwide_exec_charset_
:
557 cpp_opts
->wide_charset
= arg
;
560 case OPT_finput_charset_
:
561 cpp_opts
->input_charset
= arg
;
564 case OPT_ftemplate_depth_
:
565 max_tinst_depth
= value
;
568 case OPT_fvisibility_inlines_hidden
:
569 visibility_options
.inlines_hidden
= value
;
572 case OPT_femit_struct_debug_baseonly
:
573 set_struct_debug_option (&global_options
, loc
, "base");
576 case OPT_femit_struct_debug_reduced
:
577 set_struct_debug_option (&global_options
, loc
,
578 "dir:ord:sys,dir:gen:any,ind:base");
581 case OPT_femit_struct_debug_detailed_
:
582 set_struct_debug_option (&global_options
, loc
, arg
);
585 case OPT_fext_numeric_literals
:
586 cpp_opts
->ext_numeric_literals
= value
;
590 add_path (xstrdup (arg
), AFTER
, 0, true);
595 defer_opt (code
, arg
);
607 add_path (xstrdup (arg
), QUOTE
, 0, true);
615 add_path (xstrdup (arg
), SYSTEM
, 0, true);
618 case OPT_iwithprefix
:
619 add_prefixed_path (arg
, SYSTEM
);
622 case OPT_iwithprefixbefore
:
623 add_prefixed_path (arg
, BRACKET
);
627 cpp_set_lang (parse_in
, CLK_ASM
);
628 cpp_opts
->dollars_in_ident
= false;
632 cpp_set_lang (parse_in
, CLK_UPC
);
635 case OPT_fupc_instrument
:
636 case OPT_fupc_instrument_functions
:
637 case OPT_fupc_pthreads_model_tls
:
638 case OPT_fupc_threads_
:
639 /* processed in language-specific routine */
654 error ("output filename specified twice");
657 /* We need to handle the -Wpedantic switch here, rather than in
658 c_common_post_options, so that a subsequent -Wno-endif-labels
659 is not overridden. */
661 cpp_opts
->cpp_pedantic
= 1;
662 cpp_opts
->warn_endif_labels
= 1;
665 case OPT_print_objc_runtime_info
:
666 print_struct_values
= 1;
674 case OPT_std_gnu__98
:
675 if (!preprocessing_asm_p
)
676 set_std_cxx98 (code
== OPT_std_c__98
/* ISO */);
680 case OPT_std_gnu__11
:
681 if (!preprocessing_asm_p
)
683 set_std_cxx11 (code
== OPT_std_c__11
/* ISO */);
684 if (code
== OPT_std_c__11
)
685 cpp_opts
->ext_numeric_literals
= 0;
690 case OPT_std_gnu__1y
:
691 if (!preprocessing_asm_p
)
693 set_std_cxx1y (code
== OPT_std_c__1y
/* ISO */);
694 if (code
== OPT_std_c__1y
)
695 cpp_opts
->ext_numeric_literals
= 0;
700 case OPT_std_iso9899_199409
:
701 if (!preprocessing_asm_p
)
702 set_std_c89 (code
== OPT_std_iso9899_199409
/* c94 */, true /* ISO */);
706 if (!preprocessing_asm_p
)
707 set_std_c89 (false /* c94 */, false /* ISO */);
711 if (!preprocessing_asm_p
)
712 set_std_c99 (true /* ISO */);
716 if (!preprocessing_asm_p
)
717 set_std_c99 (false /* ISO */);
721 if (!preprocessing_asm_p
)
722 set_std_c11 (true /* ISO */);
726 if (!preprocessing_asm_p
)
727 set_std_c11 (false /* ISO */);
731 cpp_opts
->trigraphs
= 1;
734 case OPT_traditional_cpp
:
735 cpp_opts
->traditional
= 1;
750 C_handle_option_auto (&global_options
, &global_options_set
,
752 c_family_lang_mask
, kind
,
753 loc
, handlers
, global_dc
);
757 ObjC_handle_option_auto (&global_options
, &global_options_set
,
759 c_family_lang_mask
, kind
,
760 loc
, handlers
, global_dc
);
764 UPC_handle_option_auto (&global_options
, &global_options_set
,
766 c_family_lang_mask
, kind
,
767 loc
, handlers
, global_dc
);
771 CXX_handle_option_auto (&global_options
, &global_options_set
,
773 c_family_lang_mask
, kind
,
774 loc
, handlers
, global_dc
);
778 ObjCXX_handle_option_auto (&global_options
, &global_options_set
,
780 c_family_lang_mask
, kind
,
781 loc
, handlers
, global_dc
);
791 /* Default implementation of TARGET_HANDLE_C_OPTION. */
794 default_handle_c_option (size_t code ATTRIBUTE_UNUSED
,
795 const char *arg ATTRIBUTE_UNUSED
,
796 int value ATTRIBUTE_UNUSED
)
801 /* Post-switch processing. */
803 c_common_post_options (const char **pfilename
)
805 struct cpp_callbacks
*cb
;
807 /* Canonicalize the input and output filenames. */
808 if (in_fnames
== NULL
)
810 in_fnames
= XNEWVEC (const char *, 1);
813 else if (strcmp (in_fnames
[0], "-") == 0)
816 if (out_fname
== NULL
|| !strcmp (out_fname
, "-"))
819 if (cpp_opts
->deps
.style
== DEPS_NONE
)
820 check_deps_environment_vars ();
822 handle_deferred_opts ();
824 sanitize_cpp_opts ();
826 register_include_chains (parse_in
, sysroot
, iprefix
, imultilib
,
827 std_inc
, std_cxx_inc
&& c_dialect_cxx (), verbose
);
829 #ifdef C_COMMON_OVERRIDE_OPTIONS
830 /* Some machines may reject certain combinations of C
831 language-specific options. */
832 C_COMMON_OVERRIDE_OPTIONS
;
835 /* Excess precision other than "fast" requires front-end
837 if (c_dialect_cxx ())
839 if (flag_excess_precision_cmdline
== EXCESS_PRECISION_STANDARD
840 && TARGET_FLT_EVAL_METHOD_NON_DEFAULT
)
841 sorry ("-fexcess-precision=standard for C++");
842 flag_excess_precision_cmdline
= EXCESS_PRECISION_FAST
;
844 else if (flag_excess_precision_cmdline
== EXCESS_PRECISION_DEFAULT
)
845 flag_excess_precision_cmdline
= (flag_iso
846 ? EXCESS_PRECISION_STANDARD
847 : EXCESS_PRECISION_FAST
);
849 /* By default we use C99 inline semantics in GNU99 or C99 mode. C99
850 inline semantics are not supported in GNU89 or C89 mode. */
851 if (flag_gnu89_inline
== -1)
852 flag_gnu89_inline
= !flag_isoc99
;
853 else if (!flag_gnu89_inline
&& !flag_isoc99
)
854 error ("-fno-gnu89-inline is only supported in GNU99 or C99 mode");
856 /* Default to ObjC sjlj exception handling if NeXT runtime. */
857 if (flag_objc_sjlj_exceptions
< 0)
858 flag_objc_sjlj_exceptions
= flag_next_runtime
;
859 if (flag_objc_exceptions
&& !flag_objc_sjlj_exceptions
)
862 /* -Woverlength-strings is off by default, but is enabled by -Wpedantic.
863 It is never enabled in C++, as the minimum limit is not normative
865 if (c_dialect_cxx ())
866 warn_overlength_strings
= 0;
868 /* Wmain is enabled by default in C++ but not in C. */
869 /* Wmain is disabled by default for -ffreestanding (!flag_hosted),
870 even if -Wall or -Wpedantic was given (warn_main will be 2 if set
871 by -Wall, 1 if set by -Wmain). */
873 warn_main
= (c_dialect_cxx () && flag_hosted
) ? 1 : 0;
874 else if (warn_main
== 2)
875 warn_main
= flag_hosted
? 1 : 0;
877 /* In C, -Wall and -Wc++-compat enable -Wenum-compare; if it has not
878 yet been set, it is disabled by default. In C++, it is enabled
880 if (warn_enum_compare
== -1)
881 warn_enum_compare
= c_dialect_cxx () ? 1 : 0;
883 /* -Wpacked-bitfield-compat is on by default for the C languages. The
884 warning is issued in stor-layout.c which is not part of the front-end so
885 we need to selectively turn it on here. */
886 if (warn_packed_bitfield_compat
== -1)
887 warn_packed_bitfield_compat
= 1;
889 /* Special format checking options don't work without -Wformat; warn if
893 warning (OPT_Wformat_y2k
,
894 "-Wformat-y2k ignored without -Wformat");
895 warning (OPT_Wformat_extra_args
,
896 "-Wformat-extra-args ignored without -Wformat");
897 warning (OPT_Wformat_zero_length
,
898 "-Wformat-zero-length ignored without -Wformat");
899 warning (OPT_Wformat_nonliteral
,
900 "-Wformat-nonliteral ignored without -Wformat");
901 warning (OPT_Wformat_contains_nul
,
902 "-Wformat-contains-nul ignored without -Wformat");
903 warning (OPT_Wformat_security
,
904 "-Wformat-security ignored without -Wformat");
907 /* -Wimplicit-function-declaration is enabled by default for C99. */
908 if (warn_implicit_function_declaration
== -1)
909 warn_implicit_function_declaration
= flag_isoc99
;
911 if (cxx_dialect
>= cxx0x
)
913 /* If we're allowing C++0x constructs, don't warn about C++98
914 identifiers which are keywords in C++0x. */
915 warn_cxx0x_compat
= 0;
917 if (warn_narrowing
== -1)
920 else if (warn_narrowing
== -1)
923 if (flag_extern_tls_init
)
925 #if !defined (ASM_OUTPUT_DEF) || !SUPPORTS_WEAK
926 /* Lazy TLS initialization for a variable in another TU requires
927 alias and weak reference support. */
928 if (flag_extern_tls_init
> 0)
929 sorry ("external TLS initialization functions not supported "
931 flag_extern_tls_init
= 0;
933 flag_extern_tls_init
= 1;
937 if (flag_preprocess_only
)
939 /* Open the output now. We must do so even if flag_no_output is
940 on, because there may be other output than from the actual
941 preprocessing (e.g. from -dM). */
942 if (out_fname
[0] == '\0')
945 out_stream
= fopen (out_fname
, "w");
947 if (out_stream
== NULL
)
949 fatal_error ("opening output file %s: %m", out_fname
);
953 if (num_in_fnames
> 1)
954 error ("too many filenames given. Type %s --help for usage",
957 init_pp_output (out_stream
);
963 /* When writing a PCH file, avoid reading some other PCH file,
964 because the default address space slot then can't be used
965 for the output PCH file. */
968 c_common_no_more_pch ();
969 /* Only -g0 and -gdwarf* are supported with PCH, for other
970 debug formats we warn here and refuse to load any PCH files. */
971 if (write_symbols
!= NO_DEBUG
&& write_symbols
!= DWARF2_DEBUG
)
972 warning (OPT_Wdeprecated
,
973 "the \"%s\" debug format cannot be used with "
974 "pre-compiled headers", debug_type_names
[write_symbols
]);
976 else if (write_symbols
!= NO_DEBUG
&& write_symbols
!= DWARF2_DEBUG
)
977 c_common_no_more_pch ();
979 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
980 input_location
= UNKNOWN_LOCATION
;
983 cb
= cpp_get_callbacks (parse_in
);
984 cb
->file_change
= cb_file_change
;
985 cb
->dir_change
= cb_dir_change
;
986 cpp_post_options (parse_in
);
988 input_location
= UNKNOWN_LOCATION
;
990 *pfilename
= this_input_filename
991 = cpp_read_main_file (parse_in
, in_fnames
[0]);
992 /* Don't do any compilation or preprocessing if there is no input file. */
993 if (this_input_filename
== NULL
)
999 if (flag_working_directory
1000 && flag_preprocess_only
&& !flag_no_line_commands
)
1001 pp_dir_change (parse_in
, get_src_pwd ());
1003 /* Disable LTO output when outputting a precompiled header. */
1004 if (pch_file
&& flag_lto
)
1007 flag_generate_lto
= 0;
1010 return flag_preprocess_only
;
1013 /* Front end initialization common to C, ObjC and C++. */
1015 c_common_init (void)
1017 /* Set up preprocessor arithmetic. Must be done after call to
1018 c_common_nodes_and_builtins for type nodes to be good. */
1019 cpp_opts
->precision
= TYPE_PRECISION (intmax_type_node
);
1020 cpp_opts
->char_precision
= TYPE_PRECISION (char_type_node
);
1021 cpp_opts
->int_precision
= TYPE_PRECISION (integer_type_node
);
1022 cpp_opts
->wchar_precision
= TYPE_PRECISION (wchar_type_node
);
1023 cpp_opts
->unsigned_wchar
= TYPE_UNSIGNED (wchar_type_node
);
1024 cpp_opts
->bytes_big_endian
= BYTES_BIG_ENDIAN
;
1026 /* This can't happen until after wchar_precision and bytes_big_endian
1028 cpp_init_iconv (parse_in
);
1033 fputs ("Compiler executable checksum: ", stderr
);
1034 for (i
= 0; i
< 16; i
++)
1035 fprintf (stderr
, "%02x", executable_checksum
[i
]);
1036 putc ('\n', stderr
);
1039 /* Has to wait until now so that cpplib has its hash table. */
1042 if (flag_preprocess_only
)
1044 c_finish_options ();
1045 preprocess_file (parse_in
);
1052 /* Initialize the integrated preprocessor after debug output has been
1053 initialized; loop over each input file. */
1055 c_common_parse_file (void)
1062 c_finish_options ();
1066 /* Generate UPC global initialization code, if required. */
1067 if (c_dialect_upc ())
1068 upc_write_global_declarations ();
1070 /* And end the main input file, if the debug writer wants it */
1071 if (debug_hooks
->start_end_main_source_file
)
1072 (*debug_hooks
->end_source_file
) (0);
1073 if (++i
>= num_in_fnames
)
1075 cpp_undef_all (parse_in
);
1076 cpp_clear_file_cache (parse_in
);
1078 = cpp_read_main_file (parse_in
, in_fnames
[i
]);
1079 /* If an input file is missing, abandon further compilation.
1080 cpplib has issued a diagnostic. */
1081 if (!this_input_filename
)
1086 /* Common finish hook for the C, ObjC and C++ front ends. */
1088 c_common_finish (void)
1090 FILE *deps_stream
= NULL
;
1092 /* Don't write the deps file if there are errors. */
1093 if (cpp_opts
->deps
.style
!= DEPS_NONE
&& !seen_error ())
1095 /* If -M or -MM was seen without -MF, default output to the
1098 deps_stream
= out_stream
;
1101 deps_stream
= fopen (deps_file
, deps_append
? "a": "w");
1103 fatal_error ("opening dependency file %s: %m", deps_file
);
1107 /* For performance, avoid tearing down cpplib's internal structures
1108 with cpp_destroy (). */
1109 cpp_finish (parse_in
, deps_stream
);
1111 if (deps_stream
&& deps_stream
!= out_stream
1112 && (ferror (deps_stream
) || fclose (deps_stream
)))
1113 fatal_error ("closing dependency file %s: %m", deps_file
);
1115 if (out_stream
&& (ferror (out_stream
) || fclose (out_stream
)))
1116 fatal_error ("when writing output to %s: %m", out_fname
);
1119 /* Either of two environment variables can specify output of
1120 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1121 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1122 and DEPS_TARGET is the target to mention in the deps. They also
1123 result in dependency information being appended to the output file
1124 rather than overwriting it, and like Sun's compiler
1125 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1127 check_deps_environment_vars (void)
1131 spec
= getenv ("DEPENDENCIES_OUTPUT");
1133 cpp_opts
->deps
.style
= DEPS_USER
;
1136 spec
= getenv ("SUNPRO_DEPENDENCIES");
1139 cpp_opts
->deps
.style
= DEPS_SYSTEM
;
1140 cpp_opts
->deps
.ignore_main_file
= true;
1146 /* Find the space before the DEPS_TARGET, if there is one. */
1147 char *s
= strchr (spec
, ' ');
1150 /* Let the caller perform MAKE quoting. */
1151 defer_opt (OPT_MT
, s
+ 1);
1155 /* Command line -MF overrides environment variables and default. */
1164 /* Handle deferred command line switches. */
1166 handle_deferred_opts (void)
1171 /* Avoid allocating the deps buffer if we don't need it.
1172 (This flag may be true without there having been -MT or -MQ
1173 options, but we'll still need the deps buffer.) */
1177 deps
= cpp_get_deps (parse_in
);
1179 for (i
= 0; i
< deferred_count
; i
++)
1181 struct deferred_opt
*opt
= &deferred_opts
[i
];
1183 if (opt
->code
== OPT_MT
|| opt
->code
== OPT_MQ
)
1184 deps_add_target (deps
, opt
->arg
, opt
->code
== OPT_MQ
);
1188 /* These settings are appropriate for GCC, but not necessarily so for
1189 cpplib as a library. */
1191 sanitize_cpp_opts (void)
1193 /* If we don't know what style of dependencies to output, complain
1194 if any other dependency switches have been given. */
1195 if (deps_seen
&& cpp_opts
->deps
.style
== DEPS_NONE
)
1196 error ("to generate dependencies you must specify either -M or -MM");
1198 /* -dM and dependencies suppress normal output; do it here so that
1199 the last -d[MDN] switch overrides earlier ones. */
1200 if (flag_dump_macros
== 'M')
1203 /* By default, -fdirectives-only implies -dD. This allows subsequent phases
1204 to perform proper macro expansion. */
1205 if (cpp_opts
->directives_only
&& !cpp_opts
->preprocessed
&& !flag_dump_macros
)
1206 flag_dump_macros
= 'D';
1208 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1209 -dM since at least glibc relies on -M -dM to work. */
1210 /* Also, flag_no_output implies flag_no_line_commands, always. */
1213 if (flag_dump_macros
!= 'M')
1214 flag_dump_macros
= 0;
1215 flag_dump_includes
= 0;
1216 flag_no_line_commands
= 1;
1218 else if (cpp_opts
->deps
.missing_files
)
1219 error ("-MG may only be used with -M or -MM");
1221 cpp_opts
->unsigned_char
= !flag_signed_char
;
1222 cpp_opts
->stdc_0_in_system_headers
= STDC_0_IN_SYSTEM_HEADERS
;
1224 /* Wlong-long is disabled by default. It is enabled by:
1225 [-Wpedantic | -Wtraditional] -std=[gnu|c]++98 ; or
1226 [-Wpedantic | -Wtraditional] -std=non-c99 .
1228 Either -Wlong-long or -Wno-long-long override any other settings. */
1229 if (warn_long_long
== -1)
1230 warn_long_long
= ((pedantic
|| warn_traditional
)
1231 && (c_dialect_cxx () ? cxx_dialect
== cxx98
: !flag_isoc99
));
1232 cpp_opts
->cpp_warn_long_long
= warn_long_long
;
1234 /* Similarly with -Wno-variadic-macros. No check for c99 here, since
1235 this also turns off warnings about GCCs extension. */
1236 cpp_opts
->warn_variadic_macros
1237 = cpp_warn_variadic_macros
&& (pedantic
|| warn_traditional
);
1239 /* If we're generating preprocessor output, emit current directory
1240 if explicitly requested or if debugging information is enabled.
1241 ??? Maybe we should only do it for debugging formats that
1242 actually output the current directory? */
1243 if (flag_working_directory
== -1)
1244 flag_working_directory
= (debug_info_level
!= DINFO_LEVEL_NONE
);
1246 if (cpp_opts
->directives_only
)
1248 if (cpp_warn_unused_macros
)
1249 error ("-fdirectives-only is incompatible with -Wunused_macros");
1250 if (cpp_opts
->traditional
)
1251 error ("-fdirectives-only is incompatible with -traditional");
1255 /* Add include path with a prefix at the front of its name. */
1257 add_prefixed_path (const char *suffix
, size_t chain
)
1261 size_t prefix_len
, suffix_len
;
1263 suffix_len
= strlen (suffix
);
1264 prefix
= iprefix
? iprefix
: cpp_GCC_INCLUDE_DIR
;
1265 prefix_len
= iprefix
? strlen (iprefix
) : cpp_GCC_INCLUDE_DIR_len
;
1267 path
= (char *) xmalloc (prefix_len
+ suffix_len
+ 1);
1268 memcpy (path
, prefix
, prefix_len
);
1269 memcpy (path
+ prefix_len
, suffix
, suffix_len
);
1270 path
[prefix_len
+ suffix_len
] = '\0';
1272 add_path (path
, chain
, 0, false);
1275 /* Handle -D, -U, -A, -imacros, and the first -include. */
1277 c_finish_options (void)
1279 if (!cpp_opts
->preprocessed
)
1284 /* Make sure all of the builtins about to be declared have
1285 BUILTINS_LOCATION has their source_location. */
1286 source_location builtins_loc
= BUILTINS_LOCATION
;
1287 cpp_force_token_locations (parse_in
, &builtins_loc
);
1289 cpp_init_builtins (parse_in
, flag_hosted
);
1290 c_cpp_builtins (parse_in
);
1292 cpp_stop_forcing_token_locations (parse_in
);
1295 /* We're about to send user input to cpplib, so make it warn for
1296 things that we previously (when we sent it internal definitions)
1297 told it to not warn.
1299 C99 permits implementation-defined characters in identifiers.
1300 The documented meaning of -std= is to turn off extensions that
1301 conflict with the specified standard, and since a strictly
1302 conforming program cannot contain a '$', we do not condition
1303 their acceptance on the -std= setting. */
1304 cpp_opts
->warn_dollars
= (cpp_opts
->cpp_pedantic
&& !cpp_opts
->c99
);
1306 cb_file_change (parse_in
,
1307 linemap_add (line_table
, LC_RENAME
, 0,
1308 _("<command-line>"), 0));
1310 for (i
= 0; i
< deferred_count
; i
++)
1312 struct deferred_opt
*opt
= &deferred_opts
[i
];
1314 if (opt
->code
== OPT_D
)
1315 cpp_define (parse_in
, opt
->arg
);
1316 else if (opt
->code
== OPT_U
)
1317 cpp_undef (parse_in
, opt
->arg
);
1318 else if (opt
->code
== OPT_A
)
1320 if (opt
->arg
[0] == '-')
1321 cpp_unassert (parse_in
, opt
->arg
+ 1);
1323 cpp_assert (parse_in
, opt
->arg
);
1327 /* Start the main input file, if the debug writer wants it. */
1328 if (debug_hooks
->start_end_main_source_file
1329 && !flag_preprocess_only
)
1330 (*debug_hooks
->start_source_file
) (0, this_input_filename
);
1332 /* Handle -imacros after -D and -U. */
1333 for (i
= 0; i
< deferred_count
; i
++)
1335 struct deferred_opt
*opt
= &deferred_opts
[i
];
1337 if (opt
->code
== OPT_imacros
1338 && cpp_push_include (parse_in
, opt
->arg
))
1340 /* Disable push_command_line_include callback for now. */
1341 include_cursor
= deferred_count
+ 1;
1342 cpp_scan_nooutput (parse_in
);
1348 if (cpp_opts
->directives_only
)
1349 cpp_init_special_builtins (parse_in
);
1351 /* Start the main input file, if the debug writer wants it. */
1352 if (debug_hooks
->start_end_main_source_file
1353 && !flag_preprocess_only
)
1354 (*debug_hooks
->start_source_file
) (0, this_input_filename
);
1358 push_command_line_include ();
1361 /* Give CPP the next file given by -include, if any. */
1363 push_command_line_include (void)
1365 if (!done_preinclude
)
1367 done_preinclude
= true;
1368 if (flag_hosted
&& std_inc
&& !cpp_opts
->preprocessed
)
1370 const char *preinc
= targetcm
.c_preinclude ();
1371 if (preinc
&& cpp_push_default_include (parse_in
, preinc
))
1376 pch_cpp_save_state ();
1378 while (include_cursor
< deferred_count
)
1380 struct deferred_opt
*opt
= &deferred_opts
[include_cursor
++];
1382 if (!cpp_opts
->preprocessed
&& opt
->code
== OPT_include
1383 && cpp_push_include (parse_in
, opt
->arg
))
1387 if (include_cursor
== deferred_count
)
1390 /* -Wunused-macros should only warn about macros defined hereafter. */
1391 cpp_opts
->warn_unused_macros
= cpp_warn_unused_macros
;
1392 /* Restore the line map from <command line>. */
1393 if (!cpp_opts
->preprocessed
)
1394 cpp_change_file (parse_in
, LC_RENAME
, this_input_filename
);
1396 /* Set this here so the client can change the option if it wishes,
1397 and after stacking the main file so we don't trace the main file. */
1398 line_table
->trace_includes
= cpp_opts
->print_include_names
;
1402 /* File change callback. Has to handle -include files. */
1404 cb_file_change (cpp_reader
* ARG_UNUSED (pfile
),
1405 const struct line_map
*new_map
)
1407 if (flag_preprocess_only
)
1408 pp_file_change (new_map
);
1410 fe_file_change (new_map
);
1412 if (new_map
== 0 || (new_map
->reason
== LC_LEAVE
&& MAIN_FILE_P (new_map
)))
1414 pch_cpp_save_state ();
1415 push_command_line_include ();
1420 cb_dir_change (cpp_reader
* ARG_UNUSED (pfile
), const char *dir
)
1422 if (!set_src_pwd (dir
))
1423 warning (0, "too late for # directive to set debug directory");
1426 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1427 extensions if ISO). There is no concept of gnu94. */
1429 set_std_c89 (int c94
, int iso
)
1431 cpp_set_lang (parse_in
, c94
? CLK_STDC94
: iso
? CLK_STDC89
: CLK_GNUC89
);
1434 flag_no_gnu_keywords
= iso
;
1435 flag_no_nonansi_builtin
= iso
;
1441 /* Set the C 99 standard (without GNU extensions if ISO). */
1443 set_std_c99 (int iso
)
1445 cpp_set_lang (parse_in
, iso
? CLK_STDC99
: CLK_GNUC99
);
1447 flag_no_nonansi_builtin
= iso
;
1454 /* Set the C 11 standard (without GNU extensions if ISO). */
1456 set_std_c11 (int iso
)
1458 cpp_set_lang (parse_in
, iso
? CLK_STDC11
: CLK_GNUC11
);
1460 flag_no_nonansi_builtin
= iso
;
1467 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1469 set_std_cxx98 (int iso
)
1471 cpp_set_lang (parse_in
, iso
? CLK_CXX98
: CLK_GNUCXX
);
1472 flag_no_gnu_keywords
= iso
;
1473 flag_no_nonansi_builtin
= iso
;
1475 cxx_dialect
= cxx98
;
1478 /* Set the C++ 2011 standard (without GNU extensions if ISO). */
1480 set_std_cxx11 (int iso
)
1482 cpp_set_lang (parse_in
, iso
? CLK_CXX11
: CLK_GNUCXX11
);
1483 flag_no_gnu_keywords
= iso
;
1484 flag_no_nonansi_builtin
= iso
;
1486 /* C++11 includes the C99 standard library. */
1489 cxx_dialect
= cxx11
;
1492 /* Set the C++ 201y draft standard (without GNU extensions if ISO). */
1494 set_std_cxx1y (int iso
)
1496 cpp_set_lang (parse_in
, iso
? CLK_CXX11
: CLK_GNUCXX11
);
1497 flag_no_gnu_keywords
= iso
;
1498 flag_no_nonansi_builtin
= iso
;
1500 /* C++11 includes the C99 standard library. */
1503 cxx_dialect
= cxx1y
;
1506 /* Args to -d specify what to dump. Silently ignore
1507 unrecognized options; they may be aimed at toplev.c. */
1509 handle_OPT_d (const char *arg
)
1513 while ((c
= *arg
++) != '\0')
1516 case 'M': /* Dump macros only. */
1517 case 'N': /* Dump names. */
1518 case 'D': /* Dump definitions. */
1519 case 'U': /* Dump used macros. */
1520 flag_dump_macros
= c
;
1524 flag_dump_includes
= 1;