1 /* C/ObjC/C++ command line option handling.
2 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
3 Free Software Foundation, Inc.
4 Contributed by Neil Booth.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
24 #include "coretypes.h"
31 #include "langhooks.h"
32 #include "tree-inline.h"
33 #include "diagnostic.h"
35 #include "cppdefault.h"
37 #include "debug.h" /* For debug_hooks. */
43 #include "c-tree.h" /* For c_cpp_error. */
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 /* If -Wunused-macros. */
98 static bool warn_unused_macros
;
100 /* If -Wvariadic-macros. */
101 static bool warn_variadic_macros
= true;
103 /* Number of deferred options. */
104 static size_t deferred_count
;
106 /* Number of deferred options scanned for -include. */
107 static size_t include_cursor
;
109 static void set_Wimplicit (int);
110 static void handle_OPT_d (const char *);
111 static void set_std_cxx98 (int);
112 static void set_std_cxx0x (int);
113 static void set_std_c89 (int, int);
114 static void set_std_c99 (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 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
137 /* Complain that switch CODE expects an argument but none was
138 provided. OPT was the command-line option. Return FALSE to get
139 the default message in opts.c, TRUE if we provide a specialized
142 c_common_missing_argument (const char *opt
, size_t code
)
147 /* Pick up the default message. */
150 case OPT_fconstant_string_class_
:
151 error ("no class name specified with %qs", opt
);
155 error ("assertion missing after %qs", opt
);
160 error ("macro name missing after %qs", opt
);
169 error ("missing path after %qs", opt
);
178 error ("missing filename after %qs", opt
);
183 error ("missing makefile target after %qs", opt
);
190 /* Defer option CODE with argument ARG. */
192 defer_opt (enum opt_code code
, const char *arg
)
194 deferred_opts
[deferred_count
].code
= code
;
195 deferred_opts
[deferred_count
].arg
= arg
;
199 /* -Werror= may set a warning option to enable a warning that is emitted
200 by the preprocessor. Set any corresponding flag in cpp_opts. */
203 warning_as_error_callback (int option_index
)
205 switch (option_index
)
208 /* Ignore options not associated with the preprocessor. */
211 case OPT_Wdeprecated
:
212 cpp_opts
->warn_deprecated
= 1;
217 cpp_opts
->warn_comments
= 1;
221 cpp_opts
->warn_trigraphs
= 1;
225 cpp_opts
->warn_multichar
= 1;
228 case OPT_Wtraditional
:
229 cpp_opts
->warn_traditional
= 1;
233 cpp_opts
->warn_long_long
= 1;
236 case OPT_Wendif_labels
:
237 cpp_opts
->warn_endif_labels
= 1;
240 case OPT_Wvariadic_macros
:
241 /* Set the local flag that is used later to update cpp_opts. */
242 warn_variadic_macros
= 1;
245 case OPT_Wbuiltin_macro_redefined
:
246 cpp_opts
->warn_builtin_macro_redefined
= 1;
250 cpp_opts
->warn_undef
= 1;
253 case OPT_Wunused_macros
:
254 /* Set the local flag that is used later to update cpp_opts. */
255 warn_unused_macros
= 1;
258 case OPT_Wc___compat
:
259 /* Add warnings in the same way as c_common_handle_option below. */
260 if (warn_enum_compare
== -1)
261 warn_enum_compare
= 1;
262 if (warn_jump_misses_init
== -1)
263 warn_jump_misses_init
= 1;
264 cpp_opts
->warn_cxx_operator_names
= 1;
267 case OPT_Wnormalized_
:
268 inform (input_location
, "-Werror=normalized=: Set -Wnormalized=nfc");
269 cpp_opts
->warn_normalize
= normalized_C
;
272 case OPT_Winvalid_pch
:
273 cpp_opts
->warn_invalid_pch
= 1;
277 /* Handled by standard diagnostics using the option's associated
283 /* Common initialization before parsing options. */
285 c_common_init_options (unsigned int argc
, const char **argv
)
287 static const unsigned int lang_flags
[] = {CL_C
, CL_ObjC
, CL_CXX
, CL_ObjCXX
};
288 unsigned int i
, result
;
289 struct cpp_callbacks
*cb
;
291 /* Register callback for warnings enabled by -Werror=. */
292 register_warning_as_error_callback (warning_as_error_callback
);
294 /* This is conditionalized only because that is the way the front
295 ends used to do it. Maybe this should be unconditional? */
296 if (c_dialect_cxx ())
298 /* By default wrap lines at 80 characters. Is getenv
299 ("COLUMNS") preferable? */
300 diagnostic_line_cutoff (global_dc
) = 80;
301 /* By default, emit location information once for every
302 diagnostic message. */
303 diagnostic_prefixing_rule (global_dc
) = DIAGNOSTICS_SHOW_PREFIX_ONCE
;
306 parse_in
= cpp_create_reader (c_dialect_cxx () ? CLK_GNUCXX
: CLK_GNUC89
,
307 ident_hash
, line_table
);
308 cb
= cpp_get_callbacks (parse_in
);
309 cb
->error
= c_cpp_error
;
311 cpp_opts
= cpp_get_options (parse_in
);
312 cpp_opts
->dollars_in_ident
= DOLLARS_IN_IDENTIFIERS
;
313 cpp_opts
->objc
= c_dialect_objc ();
315 /* Reset to avoid warnings on internal definitions. We set it just
316 before passing on command-line options to cpplib. */
317 cpp_opts
->warn_dollars
= 0;
319 flag_exceptions
= c_dialect_cxx ();
320 warn_pointer_arith
= c_dialect_cxx ();
321 warn_write_strings
= c_dialect_cxx();
322 flag_warn_unused_result
= true;
324 /* By default, C99-like requirements for complex multiply and divide. */
325 flag_complex_method
= 2;
327 deferred_opts
= XNEWVEC (struct deferred_opt
, argc
);
329 result
= lang_flags
[c_language
];
331 if (c_language
== clk_c
)
333 /* If preprocessing assembly language, accept any of the C-family
334 front end options since the driver may pass them through. */
335 for (i
= 1; i
< argc
; i
++)
336 if (! strcmp (argv
[i
], "-lang-asm"))
338 result
|= CL_C
| CL_ObjC
| CL_CXX
| CL_ObjCXX
;
346 /* Handle switch SCODE with argument ARG. VALUE is true, unless no-
347 form of an -f or -W option was given. Returns 0 if the switch was
348 invalid, a negative number to prevent language-independent
349 processing in toplev.c (a hack necessary for the short-term). */
351 c_common_handle_option (size_t scode
, const char *arg
, int value
)
353 const struct cl_option
*option
= &cl_options
[scode
];
354 enum opt_code code
= (enum opt_code
) scode
;
357 /* Prevent resetting the language standard to a C dialect when the driver
358 has already determined that we're looking at assembler input. */
359 bool preprocessing_asm_p
= (cpp_get_options (parse_in
)->lang
== CLK_ASM
);
364 if (cl_options
[code
].flags
& (CL_C
| CL_CXX
| CL_ObjC
| CL_ObjCXX
))
366 if ((option
->flags
& CL_TARGET
)
367 && ! targetcm
.handle_c_option (scode
, arg
, value
))
374 case OPT__output_pch_
:
379 defer_opt (code
, arg
);
383 cpp_opts
->discard_comments
= 0;
387 cpp_opts
->discard_comments
= 0;
388 cpp_opts
->discard_comments_in_macro_exp
= 0;
392 defer_opt (code
, arg
);
396 flag_preprocess_only
= 1;
400 cpp_opts
->print_include_names
= 1;
404 TARGET_OPTF (xstrdup (arg
));
408 if (strcmp (arg
, "-"))
409 add_path (xstrdup (arg
), BRACKET
, 0, true);
412 if (quote_chain_split
)
413 error ("-I- specified twice");
414 quote_chain_split
= true;
415 split_quote_chain ();
416 inform (input_location
, "obsolete option -I- used, please use -iquote instead");
422 /* When doing dependencies with -M or -MM, suppress normal
423 preprocessed output, but still do -dM etc. as software
424 depends on this. Preprocessed output does occur if -MD, -MMD
425 or environment var dependency generation is used. */
426 cpp_opts
->deps
.style
= (code
== OPT_M
? DEPS_SYSTEM
: DEPS_USER
);
432 cpp_opts
->deps
.style
= (code
== OPT_MD
? DEPS_SYSTEM
: DEPS_USER
);
433 cpp_opts
->deps
.need_preprocessor_output
= true;
444 cpp_opts
->deps
.missing_files
= true;
449 cpp_opts
->deps
.phony_targets
= true;
455 defer_opt (code
, arg
);
459 flag_no_line_commands
= 1;
462 case OPT_fworking_directory
:
463 flag_working_directory
= value
;
467 defer_opt (code
, arg
);
473 set_Wimplicit (value
);
474 warn_char_subscripts
= value
;
475 warn_missing_braces
= value
;
476 warn_parentheses
= value
;
477 warn_return_type
= value
;
478 warn_sequence_point
= value
; /* Was C only. */
480 if (warn_strict_aliasing
== -1)
481 set_Wstrict_aliasing (value
);
482 warn_address
= value
;
483 if (warn_strict_overflow
== -1)
484 warn_strict_overflow
= value
;
485 warn_array_bounds
= value
;
486 warn_volatile_register_var
= value
;
488 /* Only warn about unknown pragmas that are not in system
490 warn_unknown_pragmas
= value
;
492 warn_uninitialized
= value
;
494 if (!c_dialect_cxx ())
496 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding
497 can turn it off only if it's not explicit. */
499 warn_main
= (value
? 2 : 0);
501 /* In C, -Wall turns on -Wenum-compare, which we do here.
502 In C++ it is on by default, which is done in
503 c_common_post_options. */
504 if (warn_enum_compare
== -1)
505 warn_enum_compare
= value
;
509 /* C++-specific warnings. */
510 warn_sign_compare
= value
;
511 warn_reorder
= value
;
512 warn_cxx0x_compat
= value
;
515 cpp_opts
->warn_trigraphs
= value
;
516 cpp_opts
->warn_comments
= value
;
517 cpp_opts
->warn_num_sign_change
= value
;
519 if (warn_pointer_sign
== -1)
520 warn_pointer_sign
= value
;
523 case OPT_Wbuiltin_macro_redefined
:
524 cpp_opts
->warn_builtin_macro_redefined
= value
;
529 cpp_opts
->warn_comments
= value
;
532 case OPT_Wc___compat
:
533 /* Because -Wenum-compare is the default in C++, -Wc++-compat
534 implies -Wenum-compare. */
535 if (warn_enum_compare
== -1 && value
)
536 warn_enum_compare
= value
;
537 /* Because C++ always warns about a goto which misses an
538 initialization, -Wc++-compat turns on -Wjump-misses-init. */
539 if (warn_jump_misses_init
== -1 && value
)
540 warn_jump_misses_init
= value
;
541 cpp_opts
->warn_cxx_operator_names
= value
;
544 case OPT_Wdeprecated
:
545 cpp_opts
->warn_deprecated
= value
;
548 case OPT_Wendif_labels
:
549 cpp_opts
->warn_endif_labels
= value
;
553 global_dc
->warning_as_error_requested
= value
;
556 case OPT_Werror_implicit_function_declaration
:
557 /* For backward compatibility, this is the same as
558 -Werror=implicit-function-declaration. */
559 enable_warning_as_error ("implicit-function-declaration", value
, CL_C
| CL_ObjC
);
567 set_Wformat (atoi (arg
));
571 set_Wimplicit (value
);
575 /* Silently ignore for now. */
578 case OPT_Winvalid_pch
:
579 cpp_opts
->warn_invalid_pch
= value
;
582 case OPT_Wmissing_include_dirs
:
583 cpp_opts
->warn_missing_include_dirs
= value
;
587 cpp_opts
->warn_multichar
= value
;
590 case OPT_Wnormalized_
:
591 if (!value
|| (arg
&& strcasecmp (arg
, "none") == 0))
592 cpp_opts
->warn_normalize
= normalized_none
;
593 else if (!arg
|| strcasecmp (arg
, "nfkc") == 0)
594 cpp_opts
->warn_normalize
= normalized_KC
;
595 else if (strcasecmp (arg
, "id") == 0)
596 cpp_opts
->warn_normalize
= normalized_identifier_C
;
597 else if (strcasecmp (arg
, "nfc") == 0)
598 cpp_opts
->warn_normalize
= normalized_C
;
600 error ("argument %qs to %<-Wnormalized%> not recognized", arg
);
603 case OPT_Wreturn_type
:
604 warn_return_type
= value
;
607 case OPT_Wstrict_null_sentinel
:
608 warn_strict_null_sentinel
= value
;
611 case OPT_Wtraditional
:
612 cpp_opts
->warn_traditional
= value
;
616 cpp_opts
->warn_trigraphs
= value
;
620 cpp_opts
->warn_undef
= value
;
623 case OPT_Wunknown_pragmas
:
624 /* Set to greater than 1, so that even unknown pragmas in
625 system headers will be warned about. */
626 warn_unknown_pragmas
= value
* 2;
629 case OPT_Wunused_macros
:
630 warn_unused_macros
= value
;
633 case OPT_Wvariadic_macros
:
634 warn_variadic_macros
= value
;
637 case OPT_Wwrite_strings
:
638 warn_write_strings
= value
;
644 warn_nonvdtor
= true;
648 if (!c_dialect_cxx ())
649 set_std_c89 (false, true);
651 set_std_cxx98 (true);
658 case OPT_fcond_mismatch
:
659 if (!c_dialect_cxx ())
661 flag_cond_mismatch
= value
;
666 case OPT_fall_virtual
:
667 case OPT_falt_external_templates
:
668 case OPT_fenum_int_equiv
:
669 case OPT_fexternal_templates
:
670 case OPT_fguiding_decls
:
672 case OPT_fhuge_objects
:
674 case OPT_fname_mangling_version_
:
676 case OPT_fnonnull_objects
:
678 case OPT_fstrict_prototype
:
679 case OPT_fthis_is_variable
:
680 case OPT_fvtable_thunks
:
683 warning (0, "switch %qs is no longer supported", option
->opt_text
);
686 case OPT_faccess_control
:
687 flag_access_control
= value
;
691 flag_no_asm
= !value
;
695 flag_no_builtin
= !value
;
702 disable_builtin_function (arg
);
705 case OPT_fdirectives_only
:
706 cpp_opts
->directives_only
= value
;
709 case OPT_fdollars_in_identifiers
:
710 cpp_opts
->dollars_in_ident
= value
;
713 case OPT_ffreestanding
:
715 /* Fall through.... */
718 flag_no_builtin
= !value
;
721 case OPT_fshort_double
:
722 flag_short_double
= value
;
725 case OPT_fshort_enums
:
726 flag_short_enums
= value
;
729 case OPT_fshort_wchar
:
730 flag_short_wchar
= value
;
733 case OPT_fsigned_bitfields
:
734 flag_signed_bitfields
= value
;
737 case OPT_fsigned_char
:
738 flag_signed_char
= value
;
741 case OPT_funsigned_bitfields
:
742 flag_signed_bitfields
= !value
;
745 case OPT_funsigned_char
:
746 flag_signed_char
= !value
;
750 flag_check_new
= value
;
753 case OPT_fconserve_space
:
754 flag_conserve_space
= value
;
757 case OPT_fconstant_string_class_
:
758 constant_string_class_name
= arg
;
761 case OPT_fdefault_inline
:
762 flag_default_inline
= value
;
765 case OPT_felide_constructors
:
766 flag_elide_constructors
= value
;
769 case OPT_fenforce_eh_specs
:
770 flag_enforce_eh_specs
= value
;
773 case OPT_fextended_identifiers
:
774 cpp_opts
->extended_identifiers
= value
;
778 flag_new_for_scope
= value
;
781 case OPT_fgnu_keywords
:
782 flag_no_gnu_keywords
= !value
;
785 case OPT_fgnu_runtime
:
786 flag_next_runtime
= !value
;
789 case OPT_fhandle_exceptions
:
790 warning (0, "-fhandle-exceptions has been renamed -fexceptions (and is now on by default)");
791 flag_exceptions
= value
;
794 case OPT_fimplement_inlines
:
795 flag_implement_inlines
= value
;
798 case OPT_fimplicit_inline_templates
:
799 flag_implicit_inline_templates
= value
;
802 case OPT_fimplicit_templates
:
803 flag_implicit_templates
= value
;
806 case OPT_flax_vector_conversions
:
807 flag_lax_vector_conversions
= value
;
810 case OPT_fms_extensions
:
811 flag_ms_extensions
= value
;
814 case OPT_fnext_runtime
:
815 flag_next_runtime
= value
;
818 case OPT_fnil_receivers
:
819 flag_nil_receivers
= value
;
822 case OPT_fnonansi_builtins
:
823 flag_no_nonansi_builtin
= !value
;
826 case OPT_foperator_names
:
827 cpp_opts
->operator_names
= value
;
830 case OPT_foptional_diags
:
831 flag_optional_diags
= value
;
835 cpp_opts
->restore_pch_deps
= value
;
838 case OPT_fpch_preprocess
:
839 flag_pch_preprocess
= value
;
842 case OPT_fpermissive
:
843 flag_permissive
= value
;
846 case OPT_fpreprocessed
:
847 cpp_opts
->preprocessed
= value
;
850 case OPT_freplace_objc_classes
:
851 flag_replace_objc_classes
= value
;
855 flag_use_repository
= value
;
857 flag_implicit_templates
= 0;
864 case OPT_fshow_column
:
865 cpp_opts
->show_column
= value
;
869 flag_detailed_statistics
= value
;
873 /* It is documented that we silently ignore silly values. */
874 if (value
>= 1 && value
<= 100)
875 cpp_opts
->tabstop
= value
;
878 case OPT_fexec_charset_
:
879 cpp_opts
->narrow_charset
= arg
;
882 case OPT_fwide_exec_charset_
:
883 cpp_opts
->wide_charset
= arg
;
886 case OPT_finput_charset_
:
887 cpp_opts
->input_charset
= arg
;
890 case OPT_ftemplate_depth_
:
891 /* Kept for backwards compatibility. */
892 case OPT_ftemplate_depth_eq
:
893 max_tinst_depth
= value
;
896 case OPT_fuse_cxa_atexit
:
897 flag_use_cxa_atexit
= value
;
900 case OPT_fuse_cxa_get_exception_ptr
:
901 flag_use_cxa_get_exception_ptr
= value
;
904 case OPT_fvisibility_inlines_hidden
:
905 visibility_options
.inlines_hidden
= value
;
912 case OPT_fthreadsafe_statics
:
913 flag_threadsafe_statics
= value
;
916 case OPT_fpretty_templates
:
917 flag_pretty_templates
= value
;
921 flag_zero_link
= value
;
925 flag_gen_declaration
= 1;
928 case OPT_femit_struct_debug_baseonly
:
929 set_struct_debug_option ("base");
932 case OPT_femit_struct_debug_reduced
:
933 set_struct_debug_option ("dir:ord:sys,dir:gen:any,ind:base");
936 case OPT_femit_struct_debug_detailed_
:
937 set_struct_debug_option (arg
);
941 add_path (xstrdup (arg
), AFTER
, 0, true);
946 defer_opt (code
, arg
);
958 add_path (xstrdup (arg
), QUOTE
, 0, true);
966 add_path (xstrdup (arg
), SYSTEM
, 0, true);
969 case OPT_iwithprefix
:
970 add_prefixed_path (arg
, SYSTEM
);
973 case OPT_iwithprefixbefore
:
974 add_prefixed_path (arg
, BRACKET
);
978 cpp_set_lang (parse_in
, CLK_ASM
);
979 cpp_opts
->dollars_in_ident
= false;
998 error ("output filename specified twice");
1001 /* We need to handle the -pedantic switches here, rather than in
1002 c_common_post_options, so that a subsequent -Wno-endif-labels
1003 is not overridden. */
1004 case OPT_pedantic_errors
:
1006 cpp_opts
->pedantic
= 1;
1007 cpp_opts
->warn_endif_labels
= 1;
1008 if (warn_pointer_sign
== -1)
1009 warn_pointer_sign
= 1;
1010 if (warn_overlength_strings
== -1)
1011 warn_overlength_strings
= 1;
1012 if (warn_main
== -1)
1016 case OPT_print_objc_runtime_info
:
1017 print_struct_values
= 1;
1020 case OPT_print_pch_checksum
:
1021 c_common_print_pch_checksum (stdout
);
1022 exit_after_options
= true;
1026 cpp_opts
->remap
= 1;
1030 case OPT_std_gnu__98
:
1031 if (!preprocessing_asm_p
)
1032 set_std_cxx98 (code
== OPT_std_c__98
/* ISO */);
1036 case OPT_std_gnu__0x
:
1037 if (!preprocessing_asm_p
)
1038 set_std_cxx0x (code
== OPT_std_c__0x
/* ISO */);
1043 case OPT_std_iso9899_1990
:
1044 case OPT_std_iso9899_199409
:
1045 if (!preprocessing_asm_p
)
1046 set_std_c89 (code
== OPT_std_iso9899_199409
/* c94 */, true /* ISO */);
1051 if (!preprocessing_asm_p
)
1052 set_std_c89 (false /* c94 */, false /* ISO */);
1057 case OPT_std_iso9899_1999
:
1058 case OPT_std_iso9899_199x
:
1059 if (!preprocessing_asm_p
)
1060 set_std_c99 (true /* ISO */);
1065 if (!preprocessing_asm_p
)
1066 set_std_c99 (false /* ISO */);
1070 cpp_opts
->trigraphs
= 1;
1073 case OPT_traditional_cpp
:
1074 cpp_opts
->traditional
= 1;
1093 /* Post-switch processing. */
1095 c_common_post_options (const char **pfilename
)
1097 struct cpp_callbacks
*cb
;
1099 /* Canonicalize the input and output filenames. */
1100 if (in_fnames
== NULL
)
1102 in_fnames
= XNEWVEC (const char *, 1);
1105 else if (strcmp (in_fnames
[0], "-") == 0)
1108 if (out_fname
== NULL
|| !strcmp (out_fname
, "-"))
1111 if (cpp_opts
->deps
.style
== DEPS_NONE
)
1112 check_deps_environment_vars ();
1114 handle_deferred_opts ();
1116 sanitize_cpp_opts ();
1118 register_include_chains (parse_in
, sysroot
, iprefix
, imultilib
,
1119 std_inc
, std_cxx_inc
&& c_dialect_cxx (), verbose
);
1121 #ifdef C_COMMON_OVERRIDE_OPTIONS
1122 /* Some machines may reject certain combinations of C
1123 language-specific options. */
1124 C_COMMON_OVERRIDE_OPTIONS
;
1127 /* Excess precision other than "fast" requires front-end
1129 if (c_dialect_cxx ())
1131 if (flag_excess_precision_cmdline
== EXCESS_PRECISION_STANDARD
1132 && TARGET_FLT_EVAL_METHOD_NON_DEFAULT
)
1133 sorry ("-fexcess-precision=standard for C++");
1134 flag_excess_precision_cmdline
= EXCESS_PRECISION_FAST
;
1136 else if (flag_excess_precision_cmdline
== EXCESS_PRECISION_DEFAULT
)
1137 flag_excess_precision_cmdline
= (flag_iso
1138 ? EXCESS_PRECISION_STANDARD
1139 : EXCESS_PRECISION_FAST
);
1141 /* By default we use C99 inline semantics in GNU99 or C99 mode. C99
1142 inline semantics are not supported in GNU89 or C89 mode. */
1143 if (flag_gnu89_inline
== -1)
1144 flag_gnu89_inline
= !flag_isoc99
;
1145 else if (!flag_gnu89_inline
&& !flag_isoc99
)
1146 error ("-fno-gnu89-inline is only supported in GNU99 or C99 mode");
1148 /* Default to ObjC sjlj exception handling if NeXT runtime. */
1149 if (flag_objc_sjlj_exceptions
< 0)
1150 flag_objc_sjlj_exceptions
= flag_next_runtime
;
1151 if (flag_objc_exceptions
&& !flag_objc_sjlj_exceptions
)
1152 flag_exceptions
= 1;
1154 /* -Wextra implies the following flags
1155 unless explicitly overridden. */
1156 if (warn_type_limits
== -1)
1157 warn_type_limits
= extra_warnings
;
1158 if (warn_clobbered
== -1)
1159 warn_clobbered
= extra_warnings
;
1160 if (warn_empty_body
== -1)
1161 warn_empty_body
= extra_warnings
;
1162 if (warn_sign_compare
== -1)
1163 warn_sign_compare
= extra_warnings
;
1164 if (warn_missing_field_initializers
== -1)
1165 warn_missing_field_initializers
= extra_warnings
;
1166 if (warn_missing_parameter_type
== -1)
1167 warn_missing_parameter_type
= extra_warnings
;
1168 if (warn_old_style_declaration
== -1)
1169 warn_old_style_declaration
= extra_warnings
;
1170 if (warn_override_init
== -1)
1171 warn_override_init
= extra_warnings
;
1172 if (warn_ignored_qualifiers
== -1)
1173 warn_ignored_qualifiers
= extra_warnings
;
1175 /* -Wpointer-sign is disabled by default, but it is enabled if any
1176 of -Wall or -pedantic are given. */
1177 if (warn_pointer_sign
== -1)
1178 warn_pointer_sign
= 0;
1180 if (warn_strict_aliasing
== -1)
1181 warn_strict_aliasing
= 0;
1182 if (warn_strict_overflow
== -1)
1183 warn_strict_overflow
= 0;
1184 if (warn_jump_misses_init
== -1)
1185 warn_jump_misses_init
= 0;
1187 /* -Woverlength-strings is off by default, but is enabled by -pedantic.
1188 It is never enabled in C++, as the minimum limit is not normative
1189 in that standard. */
1190 if (warn_overlength_strings
== -1 || c_dialect_cxx ())
1191 warn_overlength_strings
= 0;
1193 /* Wmain is enabled by default in C++ but not in C. */
1194 /* Wmain is disabled by default for -ffreestanding (!flag_hosted),
1195 even if -Wall was given (warn_main will be 2 if set by -Wall, 1
1196 if set by -Wmain). */
1197 if (warn_main
== -1)
1198 warn_main
= (c_dialect_cxx () && flag_hosted
) ? 1 : 0;
1199 else if (warn_main
== 2)
1200 warn_main
= flag_hosted
? 1 : 0;
1202 /* In C, -Wconversion enables -Wsign-conversion (unless disabled
1203 through -Wno-sign-conversion). While in C++,
1204 -Wsign-conversion needs to be requested explicitly. */
1205 if (warn_sign_conversion
== -1)
1206 warn_sign_conversion
= (c_dialect_cxx ()) ? 0 : warn_conversion
;
1208 /* In C, -Wall and -Wc++-compat enable -Wenum-compare, which we do
1209 in c_common_handle_option; if it has not yet been set, it is
1210 disabled by default. In C++, it is enabled by default. */
1211 if (warn_enum_compare
== -1)
1212 warn_enum_compare
= c_dialect_cxx () ? 1 : 0;
1214 /* -Wpacked-bitfield-compat is on by default for the C languages. The
1215 warning is issued in stor-layout.c which is not part of the front-end so
1216 we need to selectively turn it on here. */
1217 if (warn_packed_bitfield_compat
== -1)
1218 warn_packed_bitfield_compat
= 1;
1220 /* Special format checking options don't work without -Wformat; warn if
1224 warning (OPT_Wformat_y2k
,
1225 "-Wformat-y2k ignored without -Wformat");
1226 warning (OPT_Wformat_extra_args
,
1227 "-Wformat-extra-args ignored without -Wformat");
1228 warning (OPT_Wformat_zero_length
,
1229 "-Wformat-zero-length ignored without -Wformat");
1230 warning (OPT_Wformat_nonliteral
,
1231 "-Wformat-nonliteral ignored without -Wformat");
1232 warning (OPT_Wformat_contains_nul
,
1233 "-Wformat-contains-nul ignored without -Wformat");
1234 warning (OPT_Wformat_security
,
1235 "-Wformat-security ignored without -Wformat");
1238 /* -Wimplicit-function-declaration is enabled by default for C99. */
1239 if (warn_implicit_function_declaration
== -1)
1240 warn_implicit_function_declaration
= flag_isoc99
;
1242 /* If we're allowing C++0x constructs, don't warn about C++0x
1243 compatibility problems. */
1244 if (cxx_dialect
== cxx0x
)
1245 warn_cxx0x_compat
= 0;
1247 if (flag_preprocess_only
)
1249 /* Open the output now. We must do so even if flag_no_output is
1250 on, because there may be other output than from the actual
1251 preprocessing (e.g. from -dM). */
1252 if (out_fname
[0] == '\0')
1253 out_stream
= stdout
;
1255 out_stream
= fopen (out_fname
, "w");
1257 if (out_stream
== NULL
)
1259 fatal_error ("opening output file %s: %m", out_fname
);
1263 if (num_in_fnames
> 1)
1264 error ("too many filenames given. Type %s --help for usage",
1267 init_pp_output (out_stream
);
1273 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1274 input_location
= UNKNOWN_LOCATION
;
1277 cb
= cpp_get_callbacks (parse_in
);
1278 cb
->file_change
= cb_file_change
;
1279 cb
->dir_change
= cb_dir_change
;
1280 cpp_post_options (parse_in
);
1282 input_location
= UNKNOWN_LOCATION
;
1284 *pfilename
= this_input_filename
1285 = cpp_read_main_file (parse_in
, in_fnames
[0]);
1286 /* Don't do any compilation or preprocessing if there is no input file. */
1287 if (this_input_filename
== NULL
)
1293 if (flag_working_directory
1294 && flag_preprocess_only
&& !flag_no_line_commands
)
1295 pp_dir_change (parse_in
, get_src_pwd ());
1297 return flag_preprocess_only
;
1300 /* Front end initialization common to C, ObjC and C++. */
1302 c_common_init (void)
1304 /* Set up preprocessor arithmetic. Must be done after call to
1305 c_common_nodes_and_builtins for type nodes to be good. */
1306 cpp_opts
->precision
= TYPE_PRECISION (intmax_type_node
);
1307 cpp_opts
->char_precision
= TYPE_PRECISION (char_type_node
);
1308 cpp_opts
->int_precision
= TYPE_PRECISION (integer_type_node
);
1309 cpp_opts
->wchar_precision
= TYPE_PRECISION (wchar_type_node
);
1310 cpp_opts
->unsigned_wchar
= TYPE_UNSIGNED (wchar_type_node
);
1311 cpp_opts
->bytes_big_endian
= BYTES_BIG_ENDIAN
;
1313 /* This can't happen until after wchar_precision and bytes_big_endian
1315 cpp_init_iconv (parse_in
);
1318 c_common_print_pch_checksum (stderr
);
1320 /* Has to wait until now so that cpplib has its hash table. */
1323 if (flag_preprocess_only
)
1326 preprocess_file (parse_in
);
1333 /* Initialize the integrated preprocessor after debug output has been
1334 initialized; loop over each input file. */
1336 c_common_parse_file (int set_yydebug
)
1344 warning(0, "The C parser does not support -dy, option ignored");
1348 "The Objective-C parser does not support -dy, option ignored");
1351 warning(0, "The C++ parser does not support -dy, option ignored");
1355 "The Objective-C++ parser does not support -dy, option ignored");
1364 /* Start the main input file, if the debug writer wants it. */
1365 if (debug_hooks
->start_end_main_source_file
)
1366 (*debug_hooks
->start_source_file
) (0, this_input_filename
);
1373 /* And end the main input file, if the debug writer wants it */
1374 if (debug_hooks
->start_end_main_source_file
)
1375 (*debug_hooks
->end_source_file
) (0);
1376 if (++i
>= num_in_fnames
)
1378 cpp_undef_all (parse_in
);
1379 cpp_clear_file_cache (parse_in
);
1381 = cpp_read_main_file (parse_in
, in_fnames
[i
]);
1382 /* If an input file is missing, abandon further compilation.
1383 cpplib has issued a diagnostic. */
1384 if (!this_input_filename
)
1389 /* Common finish hook for the C, ObjC and C++ front ends. */
1391 c_common_finish (void)
1393 FILE *deps_stream
= NULL
;
1395 /* Don't write the deps file if there are errors. */
1396 if (cpp_opts
->deps
.style
!= DEPS_NONE
&& errorcount
== 0)
1398 /* If -M or -MM was seen without -MF, default output to the
1401 deps_stream
= out_stream
;
1404 deps_stream
= fopen (deps_file
, deps_append
? "a": "w");
1406 fatal_error ("opening dependency file %s: %m", deps_file
);
1410 /* For performance, avoid tearing down cpplib's internal structures
1411 with cpp_destroy (). */
1412 cpp_finish (parse_in
, deps_stream
);
1414 if (deps_stream
&& deps_stream
!= out_stream
1415 && (ferror (deps_stream
) || fclose (deps_stream
)))
1416 fatal_error ("closing dependency file %s: %m", deps_file
);
1418 if (out_stream
&& (ferror (out_stream
) || fclose (out_stream
)))
1419 fatal_error ("when writing output to %s: %m", out_fname
);
1422 /* Either of two environment variables can specify output of
1423 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1424 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1425 and DEPS_TARGET is the target to mention in the deps. They also
1426 result in dependency information being appended to the output file
1427 rather than overwriting it, and like Sun's compiler
1428 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1430 check_deps_environment_vars (void)
1434 GET_ENVIRONMENT (spec
, "DEPENDENCIES_OUTPUT");
1436 cpp_opts
->deps
.style
= DEPS_USER
;
1439 GET_ENVIRONMENT (spec
, "SUNPRO_DEPENDENCIES");
1442 cpp_opts
->deps
.style
= DEPS_SYSTEM
;
1443 cpp_opts
->deps
.ignore_main_file
= true;
1449 /* Find the space before the DEPS_TARGET, if there is one. */
1450 char *s
= strchr (spec
, ' ');
1453 /* Let the caller perform MAKE quoting. */
1454 defer_opt (OPT_MT
, s
+ 1);
1458 /* Command line -MF overrides environment variables and default. */
1467 /* Handle deferred command line switches. */
1469 handle_deferred_opts (void)
1474 /* Avoid allocating the deps buffer if we don't need it.
1475 (This flag may be true without there having been -MT or -MQ
1476 options, but we'll still need the deps buffer.) */
1480 deps
= cpp_get_deps (parse_in
);
1482 for (i
= 0; i
< deferred_count
; i
++)
1484 struct deferred_opt
*opt
= &deferred_opts
[i
];
1486 if (opt
->code
== OPT_MT
|| opt
->code
== OPT_MQ
)
1487 deps_add_target (deps
, opt
->arg
, opt
->code
== OPT_MQ
);
1491 /* These settings are appropriate for GCC, but not necessarily so for
1492 cpplib as a library. */
1494 sanitize_cpp_opts (void)
1496 /* If we don't know what style of dependencies to output, complain
1497 if any other dependency switches have been given. */
1498 if (deps_seen
&& cpp_opts
->deps
.style
== DEPS_NONE
)
1499 error ("to generate dependencies you must specify either -M or -MM");
1501 /* -dM and dependencies suppress normal output; do it here so that
1502 the last -d[MDN] switch overrides earlier ones. */
1503 if (flag_dump_macros
== 'M')
1506 /* By default, -fdirectives-only implies -dD. This allows subsequent phases
1507 to perform proper macro expansion. */
1508 if (cpp_opts
->directives_only
&& !cpp_opts
->preprocessed
&& !flag_dump_macros
)
1509 flag_dump_macros
= 'D';
1511 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1512 -dM since at least glibc relies on -M -dM to work. */
1513 /* Also, flag_no_output implies flag_no_line_commands, always. */
1516 if (flag_dump_macros
!= 'M')
1517 flag_dump_macros
= 0;
1518 flag_dump_includes
= 0;
1519 flag_no_line_commands
= 1;
1521 else if (cpp_opts
->deps
.missing_files
)
1522 error ("-MG may only be used with -M or -MM");
1524 cpp_opts
->unsigned_char
= !flag_signed_char
;
1525 cpp_opts
->stdc_0_in_system_headers
= STDC_0_IN_SYSTEM_HEADERS
;
1527 /* Wlong-long is disabled by default. It is enabled by:
1528 [-pedantic | -Wtraditional] -std=[gnu|c]++98 ; or
1529 [-pedantic | -Wtraditional] -std=non-c99 .
1531 Either -Wlong-long or -Wno-long-long override any other settings. */
1532 if (warn_long_long
== -1)
1533 warn_long_long
= ((pedantic
|| warn_traditional
)
1534 && (c_dialect_cxx () ? cxx_dialect
== cxx98
: !flag_isoc99
));
1535 cpp_opts
->warn_long_long
= warn_long_long
;
1537 /* Similarly with -Wno-variadic-macros. No check for c99 here, since
1538 this also turns off warnings about GCCs extension. */
1539 cpp_opts
->warn_variadic_macros
1540 = warn_variadic_macros
&& (pedantic
|| warn_traditional
);
1542 /* If we're generating preprocessor output, emit current directory
1543 if explicitly requested or if debugging information is enabled.
1544 ??? Maybe we should only do it for debugging formats that
1545 actually output the current directory? */
1546 if (flag_working_directory
== -1)
1547 flag_working_directory
= (debug_info_level
!= DINFO_LEVEL_NONE
);
1549 if (cpp_opts
->directives_only
)
1551 if (warn_unused_macros
)
1552 error ("-fdirectives-only is incompatible with -Wunused_macros");
1553 if (cpp_opts
->traditional
)
1554 error ("-fdirectives-only is incompatible with -traditional");
1558 /* Add include path with a prefix at the front of its name. */
1560 add_prefixed_path (const char *suffix
, size_t chain
)
1564 size_t prefix_len
, suffix_len
;
1566 suffix_len
= strlen (suffix
);
1567 prefix
= iprefix
? iprefix
: cpp_GCC_INCLUDE_DIR
;
1568 prefix_len
= iprefix
? strlen (iprefix
) : cpp_GCC_INCLUDE_DIR_len
;
1570 path
= (char *) xmalloc (prefix_len
+ suffix_len
+ 1);
1571 memcpy (path
, prefix
, prefix_len
);
1572 memcpy (path
+ prefix_len
, suffix
, suffix_len
);
1573 path
[prefix_len
+ suffix_len
] = '\0';
1575 add_path (path
, chain
, 0, false);
1578 /* Handle -D, -U, -A, -imacros, and the first -include. */
1580 finish_options (void)
1582 if (!cpp_opts
->preprocessed
)
1586 cb_file_change (parse_in
,
1587 linemap_add (line_table
, LC_RENAME
, 0,
1588 _("<built-in>"), 0));
1590 cpp_init_builtins (parse_in
, flag_hosted
);
1591 c_cpp_builtins (parse_in
);
1593 /* We're about to send user input to cpplib, so make it warn for
1594 things that we previously (when we sent it internal definitions)
1595 told it to not warn.
1597 C99 permits implementation-defined characters in identifiers.
1598 The documented meaning of -std= is to turn off extensions that
1599 conflict with the specified standard, and since a strictly
1600 conforming program cannot contain a '$', we do not condition
1601 their acceptance on the -std= setting. */
1602 cpp_opts
->warn_dollars
= (cpp_opts
->pedantic
&& !cpp_opts
->c99
);
1604 cb_file_change (parse_in
,
1605 linemap_add (line_table
, LC_RENAME
, 0,
1606 _("<command-line>"), 0));
1608 for (i
= 0; i
< deferred_count
; i
++)
1610 struct deferred_opt
*opt
= &deferred_opts
[i
];
1612 if (opt
->code
== OPT_D
)
1613 cpp_define (parse_in
, opt
->arg
);
1614 else if (opt
->code
== OPT_U
)
1615 cpp_undef (parse_in
, opt
->arg
);
1616 else if (opt
->code
== OPT_A
)
1618 if (opt
->arg
[0] == '-')
1619 cpp_unassert (parse_in
, opt
->arg
+ 1);
1621 cpp_assert (parse_in
, opt
->arg
);
1625 /* Handle -imacros after -D and -U. */
1626 for (i
= 0; i
< deferred_count
; i
++)
1628 struct deferred_opt
*opt
= &deferred_opts
[i
];
1630 if (opt
->code
== OPT_imacros
1631 && cpp_push_include (parse_in
, opt
->arg
))
1633 /* Disable push_command_line_include callback for now. */
1634 include_cursor
= deferred_count
+ 1;
1635 cpp_scan_nooutput (parse_in
);
1639 else if (cpp_opts
->directives_only
)
1640 cpp_init_special_builtins (parse_in
);
1643 push_command_line_include ();
1646 /* Give CPP the next file given by -include, if any. */
1648 push_command_line_include (void)
1650 while (include_cursor
< deferred_count
)
1652 struct deferred_opt
*opt
= &deferred_opts
[include_cursor
++];
1654 if (!cpp_opts
->preprocessed
&& opt
->code
== OPT_include
1655 && cpp_push_include (parse_in
, opt
->arg
))
1659 if (include_cursor
== deferred_count
)
1662 /* -Wunused-macros should only warn about macros defined hereafter. */
1663 cpp_opts
->warn_unused_macros
= warn_unused_macros
;
1664 /* Restore the line map from <command line>. */
1665 if (!cpp_opts
->preprocessed
)
1666 cpp_change_file (parse_in
, LC_RENAME
, this_input_filename
);
1668 /* Set this here so the client can change the option if it wishes,
1669 and after stacking the main file so we don't trace the main file. */
1670 line_table
->trace_includes
= cpp_opts
->print_include_names
;
1674 /* File change callback. Has to handle -include files. */
1676 cb_file_change (cpp_reader
* ARG_UNUSED (pfile
),
1677 const struct line_map
*new_map
)
1679 if (flag_preprocess_only
)
1680 pp_file_change (new_map
);
1682 fe_file_change (new_map
);
1684 if (new_map
== 0 || (new_map
->reason
== LC_LEAVE
&& MAIN_FILE_P (new_map
)))
1685 push_command_line_include ();
1689 cb_dir_change (cpp_reader
* ARG_UNUSED (pfile
), const char *dir
)
1691 if (!set_src_pwd (dir
))
1692 warning (0, "too late for # directive to set debug directory");
1695 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1696 extensions if ISO). There is no concept of gnu94. */
1698 set_std_c89 (int c94
, int iso
)
1700 cpp_set_lang (parse_in
, c94
? CLK_STDC94
: iso
? CLK_STDC89
: CLK_GNUC89
);
1703 flag_no_gnu_keywords
= iso
;
1704 flag_no_nonansi_builtin
= iso
;
1709 /* Set the C 99 standard (without GNU extensions if ISO). */
1711 set_std_c99 (int iso
)
1713 cpp_set_lang (parse_in
, iso
? CLK_STDC99
: CLK_GNUC99
);
1715 flag_no_nonansi_builtin
= iso
;
1721 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1723 set_std_cxx98 (int iso
)
1725 cpp_set_lang (parse_in
, iso
? CLK_CXX98
: CLK_GNUCXX
);
1726 flag_no_gnu_keywords
= iso
;
1727 flag_no_nonansi_builtin
= iso
;
1729 cxx_dialect
= cxx98
;
1732 /* Set the C++ 0x working draft "standard" (without GNU extensions if ISO). */
1734 set_std_cxx0x (int iso
)
1736 cpp_set_lang (parse_in
, iso
? CLK_CXX0X
: CLK_GNUCXX0X
);
1737 flag_no_gnu_keywords
= iso
;
1738 flag_no_nonansi_builtin
= iso
;
1740 cxx_dialect
= cxx0x
;
1743 /* Handle setting implicit to ON. */
1745 set_Wimplicit (int on
)
1748 warn_implicit_int
= on
;
1749 warn_implicit_function_declaration
= on
;
1752 /* Args to -d specify what to dump. Silently ignore
1753 unrecognized options; they may be aimed at toplev.c. */
1755 handle_OPT_d (const char *arg
)
1759 while ((c
= *arg
++) != '\0')
1762 case 'M': /* Dump macros only. */
1763 case 'N': /* Dump names. */
1764 case 'D': /* Dump definitions. */
1765 case 'U': /* Dump used macros. */
1766 flag_dump_macros
= c
;
1770 flag_dump_includes
= 1;