1 /* C/ObjC/C++ command line option handling.
2 Copyright (C) 2002, 2003, 2004 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 2, 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 COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
24 #include "coretypes.h"
31 #include "langhooks.h"
32 #include "tree-inline.h"
33 #include "diagnostic.h"
35 #include "cppdefault.h"
36 #include "c-incpath.h"
37 #include "debug.h" /* For debug_hooks. */
41 #ifndef DOLLARS_IN_IDENTIFIERS
42 # define DOLLARS_IN_IDENTIFIERS true
45 #ifndef TARGET_SYSTEM_ROOT
46 # define TARGET_SYSTEM_ROOT NULL
50 #define TARGET_OPTF(ARG)
53 static int saved_lineno
;
56 static cpp_options
*cpp_opts
;
59 static const char *this_input_filename
;
61 /* Filename and stream for preprocessed output. */
62 static const char *out_fname
;
63 static FILE *out_stream
;
65 /* Append dependencies to deps_file. */
66 static bool deps_append
;
68 /* If dependency switches (-MF etc.) have been given. */
69 static bool deps_seen
;
74 /* Dependency output file. */
75 static const char *deps_file
;
77 /* The prefix given by -iprefix, if any. */
78 static const char *iprefix
;
80 /* The system root, if any. Overridden by -isysroot. */
81 static const char *sysroot
= TARGET_SYSTEM_ROOT
;
83 /* Zero disables all standard directories for headers. */
84 static bool std_inc
= true;
86 /* Zero disables the C++-specific standard directories for headers. */
87 static bool std_cxx_inc
= true;
89 /* If the quote chain has been split by -I-. */
90 static bool quote_chain_split
;
92 /* If -Wunused-macros. */
93 static bool warn_unused_macros
;
95 /* If -Wvariadic-macros. */
96 static bool warn_variadic_macros
= true;
98 /* Number of deferred options. */
99 static size_t deferred_count
;
101 /* Number of deferred options scanned for -include. */
102 static size_t include_cursor
;
104 /* Permit Fortran front-end options. */
105 static bool permit_fortran_options
;
107 static void set_Wimplicit (int);
108 static void handle_OPT_d (const char *);
109 static void set_std_cxx98 (int);
110 static void set_std_c89 (int, int);
111 static void set_std_c99 (int);
112 static void check_deps_environment_vars (void);
113 static void handle_deferred_opts (void);
114 static void sanitize_cpp_opts (void);
115 static void add_prefixed_path (const char *, size_t);
116 static void push_command_line_include (void);
117 static void cb_file_change (cpp_reader
*, const struct line_map
*);
118 static void cb_dir_change (cpp_reader
*, const char *);
119 static void finish_options (void);
121 #ifndef STDC_0_IN_SYSTEM_HEADERS
122 #define STDC_0_IN_SYSTEM_HEADERS 0
125 /* Holds switches parsed by c_common_handle_option (), but whose
126 handling is deferred to c_common_post_options (). */
127 static void defer_opt (enum opt_code
, const char *);
128 static struct deferred_opt
134 /* Complain that switch CODE expects an argument but none was
135 provided. OPT was the command-line option. Return FALSE to get
136 the default message in opts.c, TRUE if we provide a specialized
139 c_common_missing_argument (const char *opt
, size_t code
)
144 /* Pick up the default message. */
147 case OPT_fconstant_string_class_
:
148 error ("no class name specified with \"%s\"", opt
);
152 error ("assertion missing after \"%s\"", opt
);
157 error ("macro name missing after \"%s\"", opt
);
165 error ("missing path after \"%s\"", opt
);
174 error ("missing filename after \"%s\"", opt
);
179 error ("missing makefile target after \"%s\"", opt
);
186 /* Defer option CODE with argument ARG. */
188 defer_opt (enum opt_code code
, const char *arg
)
190 deferred_opts
[deferred_count
].code
= code
;
191 deferred_opts
[deferred_count
].arg
= arg
;
195 /* Common initialization before parsing options. */
197 c_common_init_options (unsigned int argc
, const char **argv ATTRIBUTE_UNUSED
)
199 static const unsigned int lang_flags
[] = {CL_C
, CL_ObjC
, CL_CXX
, CL_ObjCXX
};
202 /* This is conditionalized only because that is the way the front
203 ends used to do it. Maybe this should be unconditional? */
204 if (c_dialect_cxx ())
206 /* By default wrap lines at 80 characters. Is getenv
207 ("COLUMNS") preferable? */
208 diagnostic_line_cutoff (global_dc
) = 80;
209 /* By default, emit location information once for every
210 diagnostic message. */
211 diagnostic_prefixing_rule (global_dc
) = DIAGNOSTICS_SHOW_PREFIX_ONCE
;
214 parse_in
= cpp_create_reader (c_dialect_cxx () ? CLK_GNUCXX
: CLK_GNUC89
,
215 ident_hash
, &line_table
);
217 cpp_opts
= cpp_get_options (parse_in
);
218 cpp_opts
->dollars_in_ident
= DOLLARS_IN_IDENTIFIERS
;
219 cpp_opts
->objc
= c_dialect_objc ();
221 /* Reset to avoid warnings on internal definitions. We set it just
222 before passing on command-line options to cpplib. */
223 cpp_opts
->warn_dollars
= 0;
225 flag_const_strings
= c_dialect_cxx ();
226 flag_exceptions
= c_dialect_cxx ();
227 warn_pointer_arith
= c_dialect_cxx ();
229 deferred_opts
= xmalloc (argc
* sizeof (struct deferred_opt
));
231 result
= lang_flags
[c_language
];
233 /* If potentially preprocessing Fortran we have to accept its front
234 end options since the driver passes most of them through. */
236 if (c_language
== clk_c
&& argc
> 2
237 && !strcmp (argv
[2], "-traditional-cpp" ))
239 permit_fortran_options
= true;
247 /* Handle switch SCODE with argument ARG. VALUE is true, unless no-
248 form of an -f or -W option was given. Returns 0 if the switch was
249 invalid, a negative number to prevent language-independent
250 processing in toplev.c (a hack necessary for the short-term). */
252 c_common_handle_option (size_t scode
, const char *arg
, int value
)
254 const struct cl_option
*option
= &cl_options
[scode
];
255 enum opt_code code
= (enum opt_code
) scode
;
261 result
= permit_fortran_options
;
264 case OPT__output_pch_
:
269 defer_opt (code
, arg
);
273 cpp_opts
->discard_comments
= 0;
277 cpp_opts
->discard_comments
= 0;
278 cpp_opts
->discard_comments_in_macro_exp
= 0;
282 defer_opt (code
, arg
);
286 flag_preprocess_only
= 1;
290 cpp_opts
->print_include_names
= 1;
294 TARGET_OPTF (xstrdup (arg
));
298 if (strcmp (arg
, "-"))
299 add_path (xstrdup (arg
), BRACKET
, 0);
302 if (quote_chain_split
)
303 error ("-I- specified twice");
304 quote_chain_split
= true;
305 split_quote_chain ();
311 /* When doing dependencies with -M or -MM, suppress normal
312 preprocessed output, but still do -dM etc. as software
313 depends on this. Preprocessed output does occur if -MD, -MMD
314 or environment var dependency generation is used. */
315 cpp_opts
->deps
.style
= (code
== OPT_M
? DEPS_SYSTEM
: DEPS_USER
);
317 cpp_opts
->inhibit_warnings
= 1;
322 cpp_opts
->deps
.style
= (code
== OPT_MD
? DEPS_SYSTEM
: DEPS_USER
);
333 cpp_opts
->deps
.missing_files
= true;
338 cpp_opts
->deps
.phony_targets
= true;
344 defer_opt (code
, arg
);
348 flag_no_line_commands
= 1;
351 case OPT_fworking_directory
:
352 flag_working_directory
= value
;
356 defer_opt (code
, arg
);
366 set_Wimplicit (value
);
367 warn_char_subscripts
= value
;
368 warn_missing_braces
= value
;
369 warn_parentheses
= value
;
370 warn_return_type
= value
;
371 warn_sequence_point
= value
; /* Was C only. */
372 if (c_dialect_cxx ())
373 warn_sign_compare
= value
;
375 warn_strict_aliasing
= value
;
377 /* Only warn about unknown pragmas that are not in system
379 warn_unknown_pragmas
= value
;
381 /* We save the value of warn_uninitialized, since if they put
382 -Wuninitialized on the command line, we need to generate a
383 warning about not using it without also specifying -O. */
384 if (warn_uninitialized
!= 1)
385 warn_uninitialized
= (value
? 2 : 0);
387 if (!c_dialect_cxx ())
388 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding
389 can turn it off only if it's not explicit. */
390 warn_main
= value
* 2;
393 /* C++-specific warnings. */
394 warn_nonvdtor
= value
;
395 warn_reorder
= value
;
396 warn_nontemplate_friend
= value
;
399 cpp_opts
->warn_trigraphs
= value
;
400 cpp_opts
->warn_comments
= value
;
401 cpp_opts
->warn_num_sign_change
= value
;
402 cpp_opts
->warn_multichar
= value
; /* Was C++ only. */
405 case OPT_Wbad_function_cast
:
406 warn_bad_function_cast
= value
;
410 warn_cast_qual
= value
;
413 case OPT_Wchar_subscripts
:
414 warn_char_subscripts
= value
;
419 cpp_opts
->warn_comments
= value
;
422 case OPT_Wconversion
:
423 warn_conversion
= value
;
426 case OPT_Wctor_dtor_privacy
:
427 warn_ctor_dtor_privacy
= value
;
430 case OPT_Wdeclaration_after_statement
:
431 warn_declaration_after_statement
= value
;
434 case OPT_Wdeprecated
:
435 warn_deprecated
= value
;
436 cpp_opts
->warn_deprecated
= value
;
439 case OPT_Wdiv_by_zero
:
440 warn_div_by_zero
= value
;
447 case OPT_Wendif_labels
:
448 cpp_opts
->warn_endif_labels
= value
;
452 cpp_opts
->warnings_are_errors
= value
;
455 case OPT_Werror_implicit_function_declaration
:
456 mesg_implicit_function_declaration
= 2;
459 case OPT_Wfloat_equal
:
460 warn_float_equal
= value
;
468 set_Wformat (atoi (arg
));
471 case OPT_Wformat_extra_args
:
472 warn_format_extra_args
= value
;
475 case OPT_Wformat_nonliteral
:
476 warn_format_nonliteral
= value
;
479 case OPT_Wformat_security
:
480 warn_format_security
= value
;
483 case OPT_Wformat_y2k
:
484 warn_format_y2k
= value
;
487 case OPT_Wformat_zero_length
:
488 warn_format_zero_length
= value
;
492 warn_init_self
= value
;
496 set_Wimplicit (value
);
499 case OPT_Wimplicit_function_declaration
:
500 mesg_implicit_function_declaration
= value
;
503 case OPT_Wimplicit_int
:
504 warn_implicit_int
= value
;
508 /* Silently ignore for now. */
511 case OPT_Winvalid_offsetof
:
512 warn_invalid_offsetof
= value
;
515 case OPT_Winvalid_pch
:
516 cpp_opts
->warn_invalid_pch
= value
;
520 warn_long_long
= value
;
530 case OPT_Wmissing_braces
:
531 warn_missing_braces
= value
;
534 case OPT_Wmissing_declarations
:
535 warn_missing_declarations
= value
;
538 case OPT_Wmissing_format_attribute
:
539 warn_missing_format_attribute
= value
;
542 case OPT_Wmissing_prototypes
:
543 warn_missing_prototypes
= value
;
547 cpp_opts
->warn_multichar
= value
;
550 case OPT_Wnested_externs
:
551 warn_nested_externs
= value
;
554 case OPT_Wnon_template_friend
:
555 warn_nontemplate_friend
= value
;
558 case OPT_Wnon_virtual_dtor
:
559 warn_nonvdtor
= value
;
563 warn_nonnull
= value
;
566 case OPT_Wold_style_definition
:
567 warn_old_style_definition
= value
;
570 case OPT_Wold_style_cast
:
571 warn_old_style_cast
= value
;
574 case OPT_Woverloaded_virtual
:
575 warn_overloaded_virtual
= value
;
578 case OPT_Wparentheses
:
579 warn_parentheses
= value
;
582 case OPT_Wpmf_conversions
:
583 warn_pmf2ptr
= value
;
586 case OPT_Wpointer_arith
:
587 warn_pointer_arith
= value
;
591 warn_protocol
= value
;
595 warn_selector
= value
;
598 case OPT_Wredundant_decls
:
599 warn_redundant_decls
= value
;
603 warn_reorder
= value
;
606 case OPT_Wreturn_type
:
607 warn_return_type
= value
;
610 case OPT_Wsequence_point
:
611 warn_sequence_point
= value
;
614 case OPT_Wsign_compare
:
615 warn_sign_compare
= value
;
618 case OPT_Wsign_promo
:
619 warn_sign_promo
= value
;
622 case OPT_Wstrict_prototypes
:
623 warn_strict_prototypes
= value
;
630 case OPT_Wsystem_headers
:
631 cpp_opts
->warn_system_headers
= value
;
634 case OPT_Wtraditional
:
635 warn_traditional
= value
;
636 cpp_opts
->warn_traditional
= value
;
640 cpp_opts
->warn_trigraphs
= value
;
643 case OPT_Wundeclared_selector
:
644 warn_undeclared_selector
= value
;
648 cpp_opts
->warn_undef
= value
;
651 case OPT_Wunknown_pragmas
:
652 /* Set to greater than 1, so that even unknown pragmas in
653 system headers will be warned about. */
654 warn_unknown_pragmas
= value
* 2;
657 case OPT_Wunused_macros
:
658 warn_unused_macros
= value
;
661 case OPT_Wvariadic_macros
:
662 warn_variadic_macros
= value
;
665 case OPT_Wwrite_strings
:
666 if (!c_dialect_cxx ())
667 flag_const_strings
= value
;
669 warn_write_strings
= value
;
673 if (!c_dialect_cxx ())
674 set_std_c89 (false, true);
676 set_std_cxx98 (true);
683 case OPT_fcond_mismatch
:
684 if (!c_dialect_cxx ())
686 flag_cond_mismatch
= value
;
691 case OPT_fall_virtual
:
692 case OPT_falt_external_templates
:
693 case OPT_fenum_int_equiv
:
694 case OPT_fexternal_templates
:
695 case OPT_fguiding_decls
:
697 case OPT_fhuge_objects
:
699 case OPT_fname_mangling_version_
:
701 case OPT_fnonnull_objects
:
703 case OPT_fstrict_prototype
:
704 case OPT_fthis_is_variable
:
705 case OPT_fvtable_thunks
:
708 warning ("switch \"%s\" is no longer supported", option
->opt_text
);
711 case OPT_faccess_control
:
712 flag_access_control
= value
;
716 flag_no_asm
= !value
;
720 flag_no_builtin
= !value
;
727 disable_builtin_function (arg
);
730 case OPT_fdollars_in_identifiers
:
731 cpp_opts
->dollars_in_ident
= value
;
735 if (!dump_switch_p (arg
))
739 case OPT_ffreestanding
:
741 /* Fall through.... */
744 flag_no_builtin
= !value
;
745 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
746 if (!value
&& warn_main
== 2)
750 case OPT_fshort_double
:
751 flag_short_double
= value
;
754 case OPT_fshort_enums
:
755 flag_short_enums
= value
;
758 case OPT_fshort_wchar
:
759 flag_short_wchar
= value
;
762 case OPT_fsigned_bitfields
:
763 flag_signed_bitfields
= value
;
764 explicit_flag_signed_bitfields
= 1;
767 case OPT_fsigned_char
:
768 flag_signed_char
= value
;
771 case OPT_funsigned_bitfields
:
772 flag_signed_bitfields
= !value
;
773 explicit_flag_signed_bitfields
= 1;
776 case OPT_funsigned_char
:
777 flag_signed_char
= !value
;
781 flag_check_new
= value
;
784 case OPT_fconserve_space
:
785 flag_conserve_space
= value
;
788 case OPT_fconst_strings
:
789 flag_const_strings
= value
;
792 case OPT_fconstant_string_class_
:
793 constant_string_class_name
= arg
;
796 case OPT_fdefault_inline
:
797 flag_default_inline
= value
;
800 case OPT_felide_constructors
:
801 flag_elide_constructors
= value
;
804 case OPT_fenforce_eh_specs
:
805 flag_enforce_eh_specs
= value
;
808 case OPT_ffixed_form
:
809 case OPT_ffixed_line_length_
:
810 /* Fortran front end options ignored when preprocessing only. */
811 if (!flag_preprocess_only
)
816 flag_new_for_scope
= value
;
819 case OPT_fgnu_keywords
:
820 flag_no_gnu_keywords
= !value
;
823 case OPT_fgnu_runtime
:
824 flag_next_runtime
= !value
;
827 case OPT_fhandle_exceptions
:
828 warning ("-fhandle-exceptions has been renamed -fexceptions (and is now on by default)");
829 flag_exceptions
= value
;
832 case OPT_fimplement_inlines
:
833 flag_implement_inlines
= value
;
836 case OPT_fimplicit_inline_templates
:
837 flag_implicit_inline_templates
= value
;
840 case OPT_fimplicit_templates
:
841 flag_implicit_templates
= value
;
844 case OPT_fms_extensions
:
845 flag_ms_extensions
= value
;
848 case OPT_fnext_runtime
:
849 flag_next_runtime
= value
;
852 case OPT_fnil_receivers
:
853 flag_nil_receivers
= value
;
856 case OPT_fnonansi_builtins
:
857 flag_no_nonansi_builtin
= !value
;
860 case OPT_fobjc_exceptions
:
861 flag_objc_exceptions
= value
;
864 case OPT_foperator_names
:
865 cpp_opts
->operator_names
= value
;
868 case OPT_foptional_diags
:
869 flag_optional_diags
= value
;
873 cpp_opts
->restore_pch_deps
= value
;
876 case OPT_fpermissive
:
877 flag_permissive
= value
;
880 case OPT_fpreprocessed
:
881 cpp_opts
->preprocessed
= value
;
884 case OPT_freplace_objc_classes
:
885 flag_replace_objc_classes
= value
;
889 flag_use_repository
= value
;
891 flag_implicit_templates
= 0;
898 case OPT_fshow_column
:
899 cpp_opts
->show_column
= value
;
903 flag_detailed_statistics
= value
;
907 /* It is documented that we silently ignore silly values. */
908 if (value
>= 1 && value
<= 100)
909 cpp_opts
->tabstop
= value
;
912 case OPT_fexec_charset_
:
913 cpp_opts
->narrow_charset
= arg
;
916 case OPT_fwide_exec_charset_
:
917 cpp_opts
->wide_charset
= arg
;
920 case OPT_finput_charset_
:
921 cpp_opts
->input_charset
= arg
;
924 case OPT_ftemplate_depth_
:
925 max_tinst_depth
= value
;
928 case OPT_fuse_cxa_atexit
:
929 flag_use_cxa_atexit
= value
;
937 flag_zero_link
= value
;
941 flag_gen_declaration
= 1;
945 add_path (xstrdup (arg
), AFTER
, 0);
950 defer_opt (code
, arg
);
962 add_path (xstrdup (arg
), SYSTEM
, 0);
965 case OPT_iwithprefix
:
966 add_prefixed_path (arg
, SYSTEM
);
969 case OPT_iwithprefixbefore
:
970 add_prefixed_path (arg
, BRACKET
);
974 cpp_set_lang (parse_in
, CLK_ASM
);
975 cpp_opts
->dollars_in_ident
= false;
994 error ("output filename specified twice");
997 /* We need to handle the -pedantic switches here, rather than in
998 c_common_post_options, so that a subsequent -Wno-endif-labels
999 is not overridden. */
1000 case OPT_pedantic_errors
:
1001 cpp_opts
->pedantic_errors
= 1;
1004 cpp_opts
->pedantic
= 1;
1005 cpp_opts
->warn_endif_labels
= 1;
1008 case OPT_print_objc_runtime_info
:
1009 print_struct_values
= 1;
1013 cpp_opts
->remap
= 1;
1017 case OPT_std_gnu__98
:
1018 set_std_cxx98 (code
== OPT_std_c__98
/* ISO */);
1022 case OPT_std_iso9899_1990
:
1023 case OPT_std_iso9899_199409
:
1024 set_std_c89 (code
== OPT_std_iso9899_199409
/* c94 */, true /* ISO */);
1028 set_std_c89 (false /* c94 */, false /* ISO */);
1033 case OPT_std_iso9899_1999
:
1034 case OPT_std_iso9899_199x
:
1035 set_std_c99 (true /* ISO */);
1040 set_std_c99 (false /* ISO */);
1044 cpp_opts
->trigraphs
= 1;
1047 case OPT_traditional_cpp
:
1048 cpp_opts
->traditional
= 1;
1056 cpp_opts
->inhibit_warnings
= 1;
1067 /* Post-switch processing. */
1069 c_common_post_options (const char **pfilename
)
1071 struct cpp_callbacks
*cb
;
1073 /* Canonicalize the input and output filenames. */
1074 if (in_fnames
== NULL
)
1076 in_fnames
= xmalloc (sizeof (in_fnames
[0]));
1079 else if (strcmp (in_fnames
[0], "-") == 0)
1082 if (out_fname
== NULL
|| !strcmp (out_fname
, "-"))
1085 if (cpp_opts
->deps
.style
== DEPS_NONE
)
1086 check_deps_environment_vars ();
1088 handle_deferred_opts ();
1090 sanitize_cpp_opts ();
1092 register_include_chains (parse_in
, sysroot
, iprefix
,
1093 std_inc
, std_cxx_inc
&& c_dialect_cxx (), verbose
);
1095 flag_inline_trees
= 1;
1097 /* Use tree inlining if possible. Function instrumentation is only
1098 done in the RTL level, so we disable tree inlining. */
1099 if (! flag_instrument_function_entry_exit
)
1101 if (!flag_no_inline
)
1103 if (flag_inline_functions
)
1105 flag_inline_trees
= 2;
1106 flag_inline_functions
= 0;
1110 /* -Wextra implies -Wsign-compare, but not if explicitly
1112 if (warn_sign_compare
== -1)
1113 warn_sign_compare
= extra_warnings
;
1115 /* Special format checking options don't work without -Wformat; warn if
1117 if (warn_format_y2k
&& !warn_format
)
1118 warning ("-Wformat-y2k ignored without -Wformat");
1119 if (warn_format_extra_args
&& !warn_format
)
1120 warning ("-Wformat-extra-args ignored without -Wformat");
1121 if (warn_format_zero_length
&& !warn_format
)
1122 warning ("-Wformat-zero-length ignored without -Wformat");
1123 if (warn_format_nonliteral
&& !warn_format
)
1124 warning ("-Wformat-nonliteral ignored without -Wformat");
1125 if (warn_format_security
&& !warn_format
)
1126 warning ("-Wformat-security ignored without -Wformat");
1127 if (warn_missing_format_attribute
&& !warn_format
)
1128 warning ("-Wmissing-format-attribute ignored without -Wformat");
1130 if (flag_preprocess_only
)
1132 /* Open the output now. We must do so even if flag_no_output is
1133 on, because there may be other output than from the actual
1134 preprocessing (e.g. from -dM). */
1135 if (out_fname
[0] == '\0')
1136 out_stream
= stdout
;
1138 out_stream
= fopen (out_fname
, "w");
1140 if (out_stream
== NULL
)
1142 fatal_error ("opening output file %s: %m", out_fname
);
1146 if (num_in_fnames
> 1)
1147 error ("too many filenames given. Type %s --help for usage",
1150 init_pp_output (out_stream
);
1156 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1160 cb
= cpp_get_callbacks (parse_in
);
1161 cb
->file_change
= cb_file_change
;
1162 cb
->dir_change
= cb_dir_change
;
1163 cpp_post_options (parse_in
);
1165 saved_lineno
= input_line
;
1168 /* If an error has occurred in cpplib, note it so we fail
1170 errorcount
+= cpp_errors (parse_in
);
1172 *pfilename
= this_input_filename
1173 = cpp_read_main_file (parse_in
, in_fnames
[0]);
1174 /* Don't do any compilation or preprocessing if there is no input file. */
1175 if (this_input_filename
== NULL
)
1181 if (flag_working_directory
1182 && flag_preprocess_only
&& ! flag_no_line_commands
)
1183 pp_dir_change (parse_in
, get_src_pwd ());
1185 return flag_preprocess_only
;
1188 /* Front end initialization common to C, ObjC and C++. */
1190 c_common_init (void)
1192 input_line
= saved_lineno
;
1194 /* Set up preprocessor arithmetic. Must be done after call to
1195 c_common_nodes_and_builtins for type nodes to be good. */
1196 cpp_opts
->precision
= TYPE_PRECISION (intmax_type_node
);
1197 cpp_opts
->char_precision
= TYPE_PRECISION (char_type_node
);
1198 cpp_opts
->int_precision
= TYPE_PRECISION (integer_type_node
);
1199 cpp_opts
->wchar_precision
= TYPE_PRECISION (wchar_type_node
);
1200 cpp_opts
->unsigned_wchar
= TYPE_UNSIGNED (wchar_type_node
);
1201 cpp_opts
->bytes_big_endian
= BYTES_BIG_ENDIAN
;
1203 /* This can't happen until after wchar_precision and bytes_big_endian
1205 cpp_init_iconv (parse_in
);
1207 if (flag_preprocess_only
)
1210 preprocess_file (parse_in
);
1214 /* Has to wait until now so that cpplib has its hash table. */
1220 /* Initialize the integrated preprocessor after debug output has been
1221 initialized; loop over each input file. */
1223 c_common_parse_file (int set_yydebug
)
1226 yydebug
= set_yydebug
;
1229 warning ("YYDEBUG not defined");
1232 if (num_in_fnames
> 1)
1233 fatal_error ("sorry, inter-module analysis temporarily out of commission");
1243 /* Common finish hook for the C, ObjC and C++ front ends. */
1245 c_common_finish (void)
1247 FILE *deps_stream
= NULL
;
1249 if (cpp_opts
->deps
.style
!= DEPS_NONE
)
1251 /* If -M or -MM was seen without -MF, default output to the
1254 deps_stream
= out_stream
;
1257 deps_stream
= fopen (deps_file
, deps_append
? "a": "w");
1259 fatal_error ("opening dependency file %s: %m", deps_file
);
1263 /* For performance, avoid tearing down cpplib's internal structures
1264 with cpp_destroy (). */
1265 errorcount
+= cpp_finish (parse_in
, deps_stream
);
1267 if (deps_stream
&& deps_stream
!= out_stream
1268 && (ferror (deps_stream
) || fclose (deps_stream
)))
1269 fatal_error ("closing dependency file %s: %m", deps_file
);
1271 if (out_stream
&& (ferror (out_stream
) || fclose (out_stream
)))
1272 fatal_error ("when writing output to %s: %m", out_fname
);
1275 /* Either of two environment variables can specify output of
1276 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1277 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1278 and DEPS_TARGET is the target to mention in the deps. They also
1279 result in dependency information being appended to the output file
1280 rather than overwriting it, and like Sun's compiler
1281 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1283 check_deps_environment_vars (void)
1287 GET_ENVIRONMENT (spec
, "DEPENDENCIES_OUTPUT");
1289 cpp_opts
->deps
.style
= DEPS_USER
;
1292 GET_ENVIRONMENT (spec
, "SUNPRO_DEPENDENCIES");
1295 cpp_opts
->deps
.style
= DEPS_SYSTEM
;
1296 cpp_opts
->deps
.ignore_main_file
= true;
1302 /* Find the space before the DEPS_TARGET, if there is one. */
1303 char *s
= strchr (spec
, ' ');
1306 /* Let the caller perform MAKE quoting. */
1307 defer_opt (OPT_MT
, s
+ 1);
1311 /* Command line -MF overrides environment variables and default. */
1319 /* Handle deferred command line switches. */
1321 handle_deferred_opts (void)
1325 for (i
= 0; i
< deferred_count
; i
++)
1327 struct deferred_opt
*opt
= &deferred_opts
[i
];
1329 if (opt
->code
== OPT_MT
|| opt
->code
== OPT_MQ
)
1330 cpp_add_dependency_target (parse_in
, opt
->arg
, opt
->code
== OPT_MQ
);
1334 /* These settings are appropriate for GCC, but not necessarily so for
1335 cpplib as a library. */
1337 sanitize_cpp_opts (void)
1339 /* If we don't know what style of dependencies to output, complain
1340 if any other dependency switches have been given. */
1341 if (deps_seen
&& cpp_opts
->deps
.style
== DEPS_NONE
)
1342 error ("to generate dependencies you must specify either -M or -MM");
1344 /* -dM and dependencies suppress normal output; do it here so that
1345 the last -d[MDN] switch overrides earlier ones. */
1346 if (flag_dump_macros
== 'M')
1349 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1350 -dM since at least glibc relies on -M -dM to work. */
1353 if (flag_dump_macros
!= 'M')
1354 flag_dump_macros
= 0;
1355 flag_dump_includes
= 0;
1358 cpp_opts
->unsigned_char
= !flag_signed_char
;
1359 cpp_opts
->stdc_0_in_system_headers
= STDC_0_IN_SYSTEM_HEADERS
;
1361 /* We want -Wno-long-long to override -pedantic -std=non-c99
1362 and/or -Wtraditional, whatever the ordering. */
1363 cpp_opts
->warn_long_long
1364 = warn_long_long
&& ((!flag_isoc99
&& pedantic
) || warn_traditional
);
1366 /* Similarly with -Wno-variadic-macros. No check for c99 here, since
1367 this also turns off warnings about GCCs extension. */
1368 cpp_opts
->warn_variadic_macros
1369 = warn_variadic_macros
&& (pedantic
|| warn_traditional
);
1371 /* If we're generating preprocessor output, emit current directory
1372 if explicitly requested or if debugging information is enabled.
1373 ??? Maybe we should only do it for debugging formats that
1374 actually output the current directory? */
1375 if (flag_working_directory
== -1)
1376 flag_working_directory
= (debug_info_level
!= DINFO_LEVEL_NONE
);
1379 /* Add include path with a prefix at the front of its name. */
1381 add_prefixed_path (const char *suffix
, size_t chain
)
1385 size_t prefix_len
, suffix_len
;
1387 suffix_len
= strlen (suffix
);
1388 prefix
= iprefix
? iprefix
: cpp_GCC_INCLUDE_DIR
;
1389 prefix_len
= iprefix
? strlen (iprefix
) : cpp_GCC_INCLUDE_DIR_len
;
1391 path
= xmalloc (prefix_len
+ suffix_len
+ 1);
1392 memcpy (path
, prefix
, prefix_len
);
1393 memcpy (path
+ prefix_len
, suffix
, suffix_len
);
1394 path
[prefix_len
+ suffix_len
] = '\0';
1396 add_path (path
, chain
, 0);
1399 /* Handle -D, -U, -A, -imacros, and the first -include. */
1401 finish_options (void)
1403 if (!cpp_opts
->preprocessed
)
1407 cpp_change_file (parse_in
, LC_RENAME
, _("<built-in>"));
1408 cpp_init_builtins (parse_in
, flag_hosted
);
1409 c_cpp_builtins (parse_in
);
1411 /* We're about to send user input to cpplib, so make it warn for
1412 things that we previously (when we sent it internal definitions)
1413 told it to not warn.
1415 C99 permits implementation-defined characters in identifiers.
1416 The documented meaning of -std= is to turn off extensions that
1417 conflict with the specified standard, and since a strictly
1418 conforming program cannot contain a '$', we do not condition
1419 their acceptance on the -std= setting. */
1420 cpp_opts
->warn_dollars
= (cpp_opts
->pedantic
&& !cpp_opts
->c99
);
1422 cpp_change_file (parse_in
, LC_RENAME
, _("<command line>"));
1423 for (i
= 0; i
< deferred_count
; i
++)
1425 struct deferred_opt
*opt
= &deferred_opts
[i
];
1427 if (opt
->code
== OPT_D
)
1428 cpp_define (parse_in
, opt
->arg
);
1429 else if (opt
->code
== OPT_U
)
1430 cpp_undef (parse_in
, opt
->arg
);
1431 else if (opt
->code
== OPT_A
)
1433 if (opt
->arg
[0] == '-')
1434 cpp_unassert (parse_in
, opt
->arg
+ 1);
1436 cpp_assert (parse_in
, opt
->arg
);
1440 /* Handle -imacros after -D and -U. */
1441 for (i
= 0; i
< deferred_count
; i
++)
1443 struct deferred_opt
*opt
= &deferred_opts
[i
];
1445 if (opt
->code
== OPT_imacros
1446 && cpp_push_include (parse_in
, opt
->arg
))
1448 /* Disable push_command_line_include callback for now. */
1449 include_cursor
= deferred_count
+ 1;
1450 cpp_scan_nooutput (parse_in
);
1456 push_command_line_include ();
1459 /* Give CPP the next file given by -include, if any. */
1461 push_command_line_include (void)
1463 while (include_cursor
< deferred_count
)
1465 struct deferred_opt
*opt
= &deferred_opts
[include_cursor
++];
1467 if (! cpp_opts
->preprocessed
&& opt
->code
== OPT_include
1468 && cpp_push_include (parse_in
, opt
->arg
))
1472 if (include_cursor
== deferred_count
)
1475 /* -Wunused-macros should only warn about macros defined hereafter. */
1476 cpp_opts
->warn_unused_macros
= warn_unused_macros
;
1477 /* Restore the line map from <command line>. */
1478 if (! cpp_opts
->preprocessed
)
1479 cpp_change_file (parse_in
, LC_RENAME
, main_input_filename
);
1481 /* Set this here so the client can change the option if it wishes,
1482 and after stacking the main file so we don't trace the main file. */
1483 line_table
.trace_includes
= cpp_opts
->print_include_names
;
1487 /* File change callback. Has to handle -include files. */
1489 cb_file_change (cpp_reader
*pfile ATTRIBUTE_UNUSED
,
1490 const struct line_map
*new_map
)
1492 if (flag_preprocess_only
)
1493 pp_file_change (new_map
);
1495 fe_file_change (new_map
);
1497 if (new_map
== 0 || (new_map
->reason
== LC_LEAVE
&& MAIN_FILE_P (new_map
)))
1498 push_command_line_include ();
1502 cb_dir_change (cpp_reader
*pfile ATTRIBUTE_UNUSED
, const char *dir
)
1504 if (! set_src_pwd (dir
))
1505 warning ("too late for # directive to set debug directory");
1508 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1509 extensions if ISO). There is no concept of gnu94. */
1511 set_std_c89 (int c94
, int iso
)
1513 cpp_set_lang (parse_in
, c94
? CLK_STDC94
: iso
? CLK_STDC89
: CLK_GNUC89
);
1516 flag_no_gnu_keywords
= iso
;
1517 flag_no_nonansi_builtin
= iso
;
1522 /* Set the C 99 standard (without GNU extensions if ISO). */
1524 set_std_c99 (int iso
)
1526 cpp_set_lang (parse_in
, iso
? CLK_STDC99
: CLK_GNUC99
);
1528 flag_no_nonansi_builtin
= iso
;
1534 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1536 set_std_cxx98 (int iso
)
1538 cpp_set_lang (parse_in
, iso
? CLK_CXX98
: CLK_GNUCXX
);
1539 flag_no_gnu_keywords
= iso
;
1540 flag_no_nonansi_builtin
= iso
;
1544 /* Handle setting implicit to ON. */
1546 set_Wimplicit (int on
)
1549 warn_implicit_int
= on
;
1552 if (mesg_implicit_function_declaration
!= 2)
1553 mesg_implicit_function_declaration
= 1;
1556 mesg_implicit_function_declaration
= 0;
1559 /* Args to -d specify what to dump. Silently ignore
1560 unrecognized options; they may be aimed at toplev.c. */
1562 handle_OPT_d (const char *arg
)
1566 while ((c
= *arg
++) != '\0')
1569 case 'M': /* Dump macros only. */
1570 case 'N': /* Dump names. */
1571 case 'D': /* Dump definitions. */
1572 flag_dump_macros
= c
;
1576 flag_dump_includes
= 1;