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. */
42 #ifndef DOLLARS_IN_IDENTIFIERS
43 # define DOLLARS_IN_IDENTIFIERS true
46 #ifndef TARGET_SYSTEM_ROOT
47 # define TARGET_SYSTEM_ROOT NULL
51 #define TARGET_OPTF(ARG)
54 static int saved_lineno
;
57 static cpp_options
*cpp_opts
;
60 static const char *this_input_filename
;
62 /* Filename and stream for preprocessed output. */
63 static const char *out_fname
;
64 static FILE *out_stream
;
66 /* Append dependencies to deps_file. */
67 static bool deps_append
;
69 /* If dependency switches (-MF etc.) have been given. */
70 static bool deps_seen
;
75 /* Dependency output file. */
76 static const char *deps_file
;
78 /* The prefix given by -iprefix, if any. */
79 static const char *iprefix
;
81 /* The system root, if any. Overridden by -isysroot. */
82 static const char *sysroot
= TARGET_SYSTEM_ROOT
;
84 /* Zero disables all standard directories for headers. */
85 static bool std_inc
= true;
87 /* Zero disables the C++-specific standard directories for headers. */
88 static bool std_cxx_inc
= true;
90 /* If the quote chain has been split by -I-. */
91 static bool quote_chain_split
;
93 /* If -Wunused-macros. */
94 static bool warn_unused_macros
;
96 /* If -Wvariadic-macros. */
97 static bool warn_variadic_macros
= true;
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 /* Permit Fortran front-end options. */
106 static bool permit_fortran_options
;
108 static void set_Wimplicit (int);
109 static void handle_OPT_d (const char *);
110 static void set_std_cxx98 (int);
111 static void set_std_c89 (int, int);
112 static void set_std_c99 (int);
113 static void check_deps_environment_vars (void);
114 static void handle_deferred_opts (void);
115 static void sanitize_cpp_opts (void);
116 static void add_prefixed_path (const char *, size_t);
117 static void push_command_line_include (void);
118 static void cb_file_change (cpp_reader
*, const struct line_map
*);
119 static void cb_dir_change (cpp_reader
*, const char *);
120 static void finish_options (void);
122 #ifndef STDC_0_IN_SYSTEM_HEADERS
123 #define STDC_0_IN_SYSTEM_HEADERS 0
126 /* Holds switches parsed by c_common_handle_option (), but whose
127 handling is deferred to c_common_post_options (). */
128 static void defer_opt (enum opt_code
, const char *);
129 static struct deferred_opt
135 /* Complain that switch CODE expects an argument but none was
136 provided. OPT was the command-line option. Return FALSE to get
137 the default message in opts.c, TRUE if we provide a specialized
140 c_common_missing_argument (const char *opt
, size_t code
)
145 /* Pick up the default message. */
148 case OPT_fconstant_string_class_
:
149 error ("no class name specified with \"%s\"", opt
);
153 error ("assertion missing after \"%s\"", opt
);
158 error ("macro name missing after \"%s\"", opt
);
167 error ("missing path after \"%s\"", opt
);
176 error ("missing filename after \"%s\"", opt
);
181 error ("missing makefile target after \"%s\"", opt
);
188 /* Defer option CODE with argument ARG. */
190 defer_opt (enum opt_code code
, const char *arg
)
192 deferred_opts
[deferred_count
].code
= code
;
193 deferred_opts
[deferred_count
].arg
= arg
;
197 /* Common initialization before parsing options. */
199 c_common_init_options (unsigned int argc
, const char **argv ATTRIBUTE_UNUSED
)
201 static const unsigned int lang_flags
[] = {CL_C
, CL_ObjC
, CL_CXX
, CL_ObjCXX
};
204 /* This is conditionalized only because that is the way the front
205 ends used to do it. Maybe this should be unconditional? */
206 if (c_dialect_cxx ())
208 /* By default wrap lines at 80 characters. Is getenv
209 ("COLUMNS") preferable? */
210 diagnostic_line_cutoff (global_dc
) = 80;
211 /* By default, emit location information once for every
212 diagnostic message. */
213 diagnostic_prefixing_rule (global_dc
) = DIAGNOSTICS_SHOW_PREFIX_ONCE
;
216 parse_in
= cpp_create_reader (c_dialect_cxx () ? CLK_GNUCXX
: CLK_GNUC89
,
217 ident_hash
, &line_table
);
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 flag_const_strings
= c_dialect_cxx ();
228 flag_exceptions
= c_dialect_cxx ();
229 warn_pointer_arith
= c_dialect_cxx ();
231 deferred_opts
= xmalloc (argc
* sizeof (struct deferred_opt
));
233 result
= lang_flags
[c_language
];
235 /* If potentially preprocessing Fortran we have to accept its front
236 end options since the driver passes most of them through. */
238 if (c_language
== clk_c
&& argc
> 2
239 && !strcmp (argv
[2], "-traditional-cpp" ))
241 permit_fortran_options
= true;
249 /* Handle switch SCODE with argument ARG. VALUE is true, unless no-
250 form of an -f or -W option was given. Returns 0 if the switch was
251 invalid, a negative number to prevent language-independent
252 processing in toplev.c (a hack necessary for the short-term). */
254 c_common_handle_option (size_t scode
, const char *arg
, int value
)
256 const struct cl_option
*option
= &cl_options
[scode
];
257 enum opt_code code
= (enum opt_code
) scode
;
263 result
= permit_fortran_options
;
266 case OPT__output_pch_
:
271 defer_opt (code
, arg
);
275 cpp_opts
->discard_comments
= 0;
279 cpp_opts
->discard_comments
= 0;
280 cpp_opts
->discard_comments_in_macro_exp
= 0;
284 defer_opt (code
, arg
);
288 flag_preprocess_only
= 1;
292 cpp_opts
->print_include_names
= 1;
296 TARGET_OPTF (xstrdup (arg
));
300 if (strcmp (arg
, "-"))
301 add_path (xstrdup (arg
), BRACKET
, 0, true);
304 if (quote_chain_split
)
305 error ("-I- specified twice");
306 quote_chain_split
= true;
307 split_quote_chain ();
308 inform ("obsolete option -I- used, please use -iquote instead");
314 /* When doing dependencies with -M or -MM, suppress normal
315 preprocessed output, but still do -dM etc. as software
316 depends on this. Preprocessed output does occur if -MD, -MMD
317 or environment var dependency generation is used. */
318 cpp_opts
->deps
.style
= (code
== OPT_M
? DEPS_SYSTEM
: DEPS_USER
);
320 cpp_opts
->inhibit_warnings
= 1;
325 cpp_opts
->deps
.style
= (code
== OPT_MD
? DEPS_SYSTEM
: DEPS_USER
);
336 cpp_opts
->deps
.missing_files
= true;
341 cpp_opts
->deps
.phony_targets
= true;
347 defer_opt (code
, arg
);
351 flag_no_line_commands
= 1;
354 case OPT_fworking_directory
:
355 flag_working_directory
= value
;
359 defer_opt (code
, arg
);
369 set_Wimplicit (value
);
370 warn_char_subscripts
= value
;
371 warn_missing_braces
= value
;
372 warn_parentheses
= value
;
373 warn_return_type
= value
;
374 warn_sequence_point
= value
; /* Was C only. */
375 if (c_dialect_cxx ())
376 warn_sign_compare
= value
;
378 warn_strict_aliasing
= value
;
380 /* Only warn about unknown pragmas that are not in system
382 warn_unknown_pragmas
= value
;
384 /* We save the value of warn_uninitialized, since if they put
385 -Wuninitialized on the command line, we need to generate a
386 warning about not using it without also specifying -O. */
387 if (warn_uninitialized
!= 1)
388 warn_uninitialized
= (value
? 2 : 0);
390 if (!c_dialect_cxx ())
391 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding
392 can turn it off only if it's not explicit. */
393 warn_main
= value
* 2;
396 /* C++-specific warnings. */
397 warn_nonvdtor
= value
;
398 warn_reorder
= value
;
399 warn_nontemplate_friend
= value
;
402 cpp_opts
->warn_trigraphs
= value
;
403 cpp_opts
->warn_comments
= value
;
404 cpp_opts
->warn_num_sign_change
= value
;
405 cpp_opts
->warn_multichar
= value
; /* Was C++ only. */
408 case OPT_Wbad_function_cast
:
409 warn_bad_function_cast
= value
;
413 warn_cast_qual
= value
;
416 case OPT_Wchar_subscripts
:
417 warn_char_subscripts
= value
;
422 cpp_opts
->warn_comments
= value
;
425 case OPT_Wconversion
:
426 warn_conversion
= value
;
429 case OPT_Wctor_dtor_privacy
:
430 warn_ctor_dtor_privacy
= value
;
433 case OPT_Wdeclaration_after_statement
:
434 warn_declaration_after_statement
= value
;
437 case OPT_Wdeprecated
:
438 warn_deprecated
= value
;
439 cpp_opts
->warn_deprecated
= value
;
442 case OPT_Wdiv_by_zero
:
443 warn_div_by_zero
= value
;
450 case OPT_Wendif_labels
:
451 cpp_opts
->warn_endif_labels
= value
;
455 cpp_opts
->warnings_are_errors
= value
;
458 case OPT_Werror_implicit_function_declaration
:
459 mesg_implicit_function_declaration
= 2;
462 case OPT_Wfloat_equal
:
463 warn_float_equal
= value
;
471 set_Wformat (atoi (arg
));
474 case OPT_Wformat_extra_args
:
475 warn_format_extra_args
= value
;
478 case OPT_Wformat_nonliteral
:
479 warn_format_nonliteral
= value
;
482 case OPT_Wformat_security
:
483 warn_format_security
= value
;
486 case OPT_Wformat_y2k
:
487 warn_format_y2k
= value
;
490 case OPT_Wformat_zero_length
:
491 warn_format_zero_length
= value
;
495 warn_init_self
= value
;
499 set_Wimplicit (value
);
502 case OPT_Wimplicit_function_declaration
:
503 mesg_implicit_function_declaration
= value
;
506 case OPT_Wimplicit_int
:
507 warn_implicit_int
= value
;
511 /* Silently ignore for now. */
514 case OPT_Winvalid_offsetof
:
515 warn_invalid_offsetof
= value
;
518 case OPT_Winvalid_pch
:
519 cpp_opts
->warn_invalid_pch
= value
;
523 warn_long_long
= value
;
533 case OPT_Wmissing_braces
:
534 warn_missing_braces
= value
;
537 case OPT_Wmissing_declarations
:
538 warn_missing_declarations
= value
;
541 case OPT_Wmissing_format_attribute
:
542 warn_missing_format_attribute
= value
;
545 case OPT_Wmissing_include_dirs
:
546 cpp_opts
->warn_missing_include_dirs
= value
;
549 case OPT_Wmissing_prototypes
:
550 warn_missing_prototypes
= value
;
554 cpp_opts
->warn_multichar
= value
;
557 case OPT_Wnested_externs
:
558 warn_nested_externs
= value
;
561 case OPT_Wnon_template_friend
:
562 warn_nontemplate_friend
= value
;
565 case OPT_Wnon_virtual_dtor
:
566 warn_nonvdtor
= value
;
570 warn_nonnull
= value
;
573 case OPT_Wold_style_definition
:
574 warn_old_style_definition
= value
;
577 case OPT_Wold_style_cast
:
578 warn_old_style_cast
= value
;
581 case OPT_Woverloaded_virtual
:
582 warn_overloaded_virtual
= value
;
585 case OPT_Wparentheses
:
586 warn_parentheses
= value
;
589 case OPT_Wpmf_conversions
:
590 warn_pmf2ptr
= value
;
593 case OPT_Wpointer_arith
:
594 warn_pointer_arith
= value
;
598 warn_protocol
= value
;
602 warn_selector
= value
;
605 case OPT_Wredundant_decls
:
606 warn_redundant_decls
= value
;
610 warn_reorder
= value
;
613 case OPT_Wreturn_type
:
614 warn_return_type
= value
;
617 case OPT_Wsequence_point
:
618 warn_sequence_point
= value
;
621 case OPT_Wsign_compare
:
622 warn_sign_compare
= value
;
625 case OPT_Wsign_promo
:
626 warn_sign_promo
= value
;
629 case OPT_Wstrict_prototypes
:
630 warn_strict_prototypes
= value
;
637 case OPT_Wsystem_headers
:
638 cpp_opts
->warn_system_headers
= value
;
641 case OPT_Wtraditional
:
642 warn_traditional
= value
;
643 cpp_opts
->warn_traditional
= value
;
647 cpp_opts
->warn_trigraphs
= value
;
650 case OPT_Wundeclared_selector
:
651 warn_undeclared_selector
= value
;
655 cpp_opts
->warn_undef
= value
;
658 case OPT_Wunknown_pragmas
:
659 /* Set to greater than 1, so that even unknown pragmas in
660 system headers will be warned about. */
661 warn_unknown_pragmas
= value
* 2;
664 case OPT_Wunused_macros
:
665 warn_unused_macros
= value
;
668 case OPT_Wvariadic_macros
:
669 warn_variadic_macros
= value
;
672 case OPT_Wwrite_strings
:
673 if (!c_dialect_cxx ())
674 flag_const_strings
= value
;
676 warn_write_strings
= value
;
680 if (!c_dialect_cxx ())
681 set_std_c89 (false, true);
683 set_std_cxx98 (true);
690 case OPT_fcond_mismatch
:
691 if (!c_dialect_cxx ())
693 flag_cond_mismatch
= value
;
698 case OPT_fall_virtual
:
699 case OPT_falt_external_templates
:
700 case OPT_fenum_int_equiv
:
701 case OPT_fexternal_templates
:
702 case OPT_fguiding_decls
:
704 case OPT_fhuge_objects
:
706 case OPT_fname_mangling_version_
:
708 case OPT_fnonnull_objects
:
710 case OPT_fstrict_prototype
:
711 case OPT_fthis_is_variable
:
712 case OPT_fvtable_thunks
:
715 warning ("switch \"%s\" is no longer supported", option
->opt_text
);
718 case OPT_faccess_control
:
719 flag_access_control
= value
;
723 flag_no_asm
= !value
;
727 flag_no_builtin
= !value
;
734 disable_builtin_function (arg
);
737 case OPT_fdollars_in_identifiers
:
738 cpp_opts
->dollars_in_ident
= value
;
741 case OPT_ffreestanding
:
743 /* Fall through.... */
746 flag_no_builtin
= !value
;
747 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
748 if (!value
&& warn_main
== 2)
752 case OPT_fshort_double
:
753 flag_short_double
= value
;
756 case OPT_fshort_enums
:
757 flag_short_enums
= value
;
760 case OPT_fshort_wchar
:
761 flag_short_wchar
= value
;
764 case OPT_fsigned_bitfields
:
765 flag_signed_bitfields
= value
;
766 explicit_flag_signed_bitfields
= 1;
769 case OPT_fsigned_char
:
770 flag_signed_char
= value
;
773 case OPT_funsigned_bitfields
:
774 flag_signed_bitfields
= !value
;
775 explicit_flag_signed_bitfields
= 1;
778 case OPT_funsigned_char
:
779 flag_signed_char
= !value
;
783 flag_check_new
= value
;
786 case OPT_fconserve_space
:
787 flag_conserve_space
= value
;
790 case OPT_fconst_strings
:
791 flag_const_strings
= value
;
794 case OPT_fconstant_string_class_
:
795 constant_string_class_name
= arg
;
798 case OPT_fdefault_inline
:
799 flag_default_inline
= value
;
802 case OPT_felide_constructors
:
803 flag_elide_constructors
= value
;
806 case OPT_fenforce_eh_specs
:
807 flag_enforce_eh_specs
= value
;
810 case OPT_ffixed_form
:
811 case OPT_ffixed_line_length_
:
812 /* Fortran front end options ignored when preprocessing only. */
813 if (!flag_preprocess_only
)
818 flag_new_for_scope
= value
;
821 case OPT_fgnu_keywords
:
822 flag_no_gnu_keywords
= !value
;
825 case OPT_fgnu_runtime
:
826 flag_next_runtime
= !value
;
829 case OPT_fhandle_exceptions
:
830 warning ("-fhandle-exceptions has been renamed -fexceptions (and is now on by default)");
831 flag_exceptions
= value
;
834 case OPT_fimplement_inlines
:
835 flag_implement_inlines
= value
;
838 case OPT_fimplicit_inline_templates
:
839 flag_implicit_inline_templates
= value
;
842 case OPT_fimplicit_templates
:
843 flag_implicit_templates
= value
;
846 case OPT_fms_extensions
:
847 flag_ms_extensions
= value
;
850 case OPT_fnext_runtime
:
851 flag_next_runtime
= value
;
854 case OPT_fnil_receivers
:
855 flag_nil_receivers
= value
;
858 case OPT_fnonansi_builtins
:
859 flag_no_nonansi_builtin
= !value
;
862 case OPT_fobjc_exceptions
:
863 flag_objc_exceptions
= value
;
866 case OPT_fobjc_sjlj_exceptions
:
867 flag_objc_sjlj_exceptions
= value
;
870 case OPT_foperator_names
:
871 cpp_opts
->operator_names
= value
;
874 case OPT_foptional_diags
:
875 flag_optional_diags
= value
;
879 cpp_opts
->restore_pch_deps
= value
;
882 case OPT_fpch_preprocess
:
883 flag_pch_preprocess
= value
;
886 case OPT_fpermissive
:
887 flag_permissive
= value
;
890 case OPT_fpreprocessed
:
891 cpp_opts
->preprocessed
= value
;
894 case OPT_freplace_objc_classes
:
895 flag_replace_objc_classes
= value
;
899 flag_use_repository
= value
;
901 flag_implicit_templates
= 0;
908 case OPT_fshow_column
:
909 cpp_opts
->show_column
= value
;
913 flag_detailed_statistics
= value
;
917 /* It is documented that we silently ignore silly values. */
918 if (value
>= 1 && value
<= 100)
919 cpp_opts
->tabstop
= value
;
922 case OPT_fexec_charset_
:
923 cpp_opts
->narrow_charset
= arg
;
926 case OPT_fwide_exec_charset_
:
927 cpp_opts
->wide_charset
= arg
;
930 case OPT_finput_charset_
:
931 cpp_opts
->input_charset
= arg
;
934 case OPT_ftemplate_depth_
:
935 max_tinst_depth
= value
;
938 case OPT_fuse_cxa_atexit
:
939 flag_use_cxa_atexit
= value
;
947 flag_zero_link
= value
;
951 flag_gen_declaration
= 1;
955 add_path (xstrdup (arg
), AFTER
, 0, true);
960 defer_opt (code
, arg
);
968 add_path (xstrdup (arg
), QUOTE
, 0, true);
976 add_path (xstrdup (arg
), SYSTEM
, 0, true);
979 case OPT_iwithprefix
:
980 add_prefixed_path (arg
, SYSTEM
);
983 case OPT_iwithprefixbefore
:
984 add_prefixed_path (arg
, BRACKET
);
988 cpp_set_lang (parse_in
, CLK_ASM
);
989 cpp_opts
->dollars_in_ident
= false;
1000 case OPT_nostdinc__
:
1001 std_cxx_inc
= false;
1008 error ("output filename specified twice");
1011 /* We need to handle the -pedantic switches here, rather than in
1012 c_common_post_options, so that a subsequent -Wno-endif-labels
1013 is not overridden. */
1014 case OPT_pedantic_errors
:
1015 cpp_opts
->pedantic_errors
= 1;
1018 cpp_opts
->pedantic
= 1;
1019 cpp_opts
->warn_endif_labels
= 1;
1022 case OPT_print_objc_runtime_info
:
1023 print_struct_values
= 1;
1027 cpp_opts
->remap
= 1;
1031 case OPT_std_gnu__98
:
1032 set_std_cxx98 (code
== OPT_std_c__98
/* ISO */);
1036 case OPT_std_iso9899_1990
:
1037 case OPT_std_iso9899_199409
:
1038 set_std_c89 (code
== OPT_std_iso9899_199409
/* c94 */, true /* ISO */);
1042 set_std_c89 (false /* c94 */, false /* ISO */);
1047 case OPT_std_iso9899_1999
:
1048 case OPT_std_iso9899_199x
:
1049 set_std_c99 (true /* ISO */);
1054 set_std_c99 (false /* ISO */);
1058 cpp_opts
->trigraphs
= 1;
1061 case OPT_traditional_cpp
:
1062 cpp_opts
->traditional
= 1;
1070 cpp_opts
->inhibit_warnings
= 1;
1081 /* Post-switch processing. */
1083 c_common_post_options (const char **pfilename
)
1085 struct cpp_callbacks
*cb
;
1087 /* Canonicalize the input and output filenames. */
1088 if (in_fnames
== NULL
)
1090 in_fnames
= xmalloc (sizeof (in_fnames
[0]));
1093 else if (strcmp (in_fnames
[0], "-") == 0)
1096 if (out_fname
== NULL
|| !strcmp (out_fname
, "-"))
1099 if (cpp_opts
->deps
.style
== DEPS_NONE
)
1100 check_deps_environment_vars ();
1102 handle_deferred_opts ();
1104 sanitize_cpp_opts ();
1106 register_include_chains (parse_in
, sysroot
, iprefix
,
1107 std_inc
, std_cxx_inc
&& c_dialect_cxx (), verbose
);
1109 flag_inline_trees
= 1;
1111 /* Use tree inlining. */
1112 if (!flag_no_inline
)
1114 if (flag_inline_functions
)
1116 flag_inline_trees
= 2;
1117 flag_inline_functions
= 0;
1120 /* Default to ObjC sjlj exception handling if NeXT runtime. */
1121 if (flag_objc_sjlj_exceptions
< 0)
1122 flag_objc_sjlj_exceptions
= flag_next_runtime
;
1123 if (flag_objc_exceptions
&& !flag_objc_sjlj_exceptions
)
1124 flag_exceptions
= 1;
1126 /* -Wextra implies -Wsign-compare, but not if explicitly
1128 if (warn_sign_compare
== -1)
1129 warn_sign_compare
= extra_warnings
;
1131 /* Special format checking options don't work without -Wformat; warn if
1133 if (warn_format_y2k
&& !warn_format
)
1134 warning ("-Wformat-y2k ignored without -Wformat");
1135 if (warn_format_extra_args
&& !warn_format
)
1136 warning ("-Wformat-extra-args ignored without -Wformat");
1137 if (warn_format_zero_length
&& !warn_format
)
1138 warning ("-Wformat-zero-length ignored without -Wformat");
1139 if (warn_format_nonliteral
&& !warn_format
)
1140 warning ("-Wformat-nonliteral ignored without -Wformat");
1141 if (warn_format_security
&& !warn_format
)
1142 warning ("-Wformat-security ignored without -Wformat");
1143 if (warn_missing_format_attribute
&& !warn_format
)
1144 warning ("-Wmissing-format-attribute ignored without -Wformat");
1146 if (flag_preprocess_only
)
1148 /* Open the output now. We must do so even if flag_no_output is
1149 on, because there may be other output than from the actual
1150 preprocessing (e.g. from -dM). */
1151 if (out_fname
[0] == '\0')
1152 out_stream
= stdout
;
1154 out_stream
= fopen (out_fname
, "w");
1156 if (out_stream
== NULL
)
1158 fatal_error ("opening output file %s: %m", out_fname
);
1162 if (num_in_fnames
> 1)
1163 error ("too many filenames given. Type %s --help for usage",
1166 init_pp_output (out_stream
);
1172 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1176 cb
= cpp_get_callbacks (parse_in
);
1177 cb
->file_change
= cb_file_change
;
1178 cb
->dir_change
= cb_dir_change
;
1179 cpp_post_options (parse_in
);
1181 saved_lineno
= input_line
;
1184 /* If an error has occurred in cpplib, note it so we fail
1186 errorcount
+= cpp_errors (parse_in
);
1188 *pfilename
= this_input_filename
1189 = cpp_read_main_file (parse_in
, in_fnames
[0]);
1190 /* Don't do any compilation or preprocessing if there is no input file. */
1191 if (this_input_filename
== NULL
)
1197 if (flag_working_directory
1198 && flag_preprocess_only
&& ! flag_no_line_commands
)
1199 pp_dir_change (parse_in
, get_src_pwd ());
1201 return flag_preprocess_only
;
1204 /* Front end initialization common to C, ObjC and C++. */
1206 c_common_init (void)
1208 input_line
= saved_lineno
;
1210 /* Set up preprocessor arithmetic. Must be done after call to
1211 c_common_nodes_and_builtins for type nodes to be good. */
1212 cpp_opts
->precision
= TYPE_PRECISION (intmax_type_node
);
1213 cpp_opts
->char_precision
= TYPE_PRECISION (char_type_node
);
1214 cpp_opts
->int_precision
= TYPE_PRECISION (integer_type_node
);
1215 cpp_opts
->wchar_precision
= TYPE_PRECISION (wchar_type_node
);
1216 cpp_opts
->unsigned_wchar
= TYPE_UNSIGNED (wchar_type_node
);
1217 cpp_opts
->bytes_big_endian
= BYTES_BIG_ENDIAN
;
1219 /* This can't happen until after wchar_precision and bytes_big_endian
1221 cpp_init_iconv (parse_in
);
1223 if (flag_preprocess_only
)
1226 preprocess_file (parse_in
);
1230 /* Has to wait until now so that cpplib has its hash table. */
1236 /* Initialize the integrated preprocessor after debug output has been
1237 initialized; loop over each input file. */
1239 c_common_parse_file (int set_yydebug
)
1242 yydebug
= set_yydebug
;
1245 warning ("YYDEBUG not defined");
1248 if (num_in_fnames
> 1)
1249 fatal_error ("sorry, inter-module analysis temporarily out of commission");
1259 /* Common finish hook for the C, ObjC and C++ front ends. */
1261 c_common_finish (void)
1263 FILE *deps_stream
= NULL
;
1265 if (cpp_opts
->deps
.style
!= DEPS_NONE
)
1267 /* If -M or -MM was seen without -MF, default output to the
1270 deps_stream
= out_stream
;
1273 deps_stream
= fopen (deps_file
, deps_append
? "a": "w");
1275 fatal_error ("opening dependency file %s: %m", deps_file
);
1279 /* For performance, avoid tearing down cpplib's internal structures
1280 with cpp_destroy (). */
1281 errorcount
+= cpp_finish (parse_in
, deps_stream
);
1283 if (deps_stream
&& deps_stream
!= out_stream
1284 && (ferror (deps_stream
) || fclose (deps_stream
)))
1285 fatal_error ("closing dependency file %s: %m", deps_file
);
1287 if (out_stream
&& (ferror (out_stream
) || fclose (out_stream
)))
1288 fatal_error ("when writing output to %s: %m", out_fname
);
1291 /* Either of two environment variables can specify output of
1292 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1293 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1294 and DEPS_TARGET is the target to mention in the deps. They also
1295 result in dependency information being appended to the output file
1296 rather than overwriting it, and like Sun's compiler
1297 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1299 check_deps_environment_vars (void)
1303 GET_ENVIRONMENT (spec
, "DEPENDENCIES_OUTPUT");
1305 cpp_opts
->deps
.style
= DEPS_USER
;
1308 GET_ENVIRONMENT (spec
, "SUNPRO_DEPENDENCIES");
1311 cpp_opts
->deps
.style
= DEPS_SYSTEM
;
1312 cpp_opts
->deps
.ignore_main_file
= true;
1318 /* Find the space before the DEPS_TARGET, if there is one. */
1319 char *s
= strchr (spec
, ' ');
1322 /* Let the caller perform MAKE quoting. */
1323 defer_opt (OPT_MT
, s
+ 1);
1327 /* Command line -MF overrides environment variables and default. */
1335 /* Handle deferred command line switches. */
1337 handle_deferred_opts (void)
1342 /* Avoid allocating the deps buffer if we don't need it.
1343 (This flag may be true without there having been -MT or -MQ
1344 options, but we'll still need the deps buffer.) */
1348 deps
= cpp_get_deps (parse_in
);
1350 for (i
= 0; i
< deferred_count
; i
++)
1352 struct deferred_opt
*opt
= &deferred_opts
[i
];
1354 if (opt
->code
== OPT_MT
|| opt
->code
== OPT_MQ
)
1355 deps_add_target (deps
, opt
->arg
, opt
->code
== OPT_MQ
);
1359 /* These settings are appropriate for GCC, but not necessarily so for
1360 cpplib as a library. */
1362 sanitize_cpp_opts (void)
1364 /* If we don't know what style of dependencies to output, complain
1365 if any other dependency switches have been given. */
1366 if (deps_seen
&& cpp_opts
->deps
.style
== DEPS_NONE
)
1367 error ("to generate dependencies you must specify either -M or -MM");
1369 /* -dM and dependencies suppress normal output; do it here so that
1370 the last -d[MDN] switch overrides earlier ones. */
1371 if (flag_dump_macros
== 'M')
1374 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1375 -dM since at least glibc relies on -M -dM to work. */
1378 if (flag_dump_macros
!= 'M')
1379 flag_dump_macros
= 0;
1380 flag_dump_includes
= 0;
1383 cpp_opts
->unsigned_char
= !flag_signed_char
;
1384 cpp_opts
->stdc_0_in_system_headers
= STDC_0_IN_SYSTEM_HEADERS
;
1386 /* We want -Wno-long-long to override -pedantic -std=non-c99
1387 and/or -Wtraditional, whatever the ordering. */
1388 cpp_opts
->warn_long_long
1389 = warn_long_long
&& ((!flag_isoc99
&& pedantic
) || warn_traditional
);
1391 /* Similarly with -Wno-variadic-macros. No check for c99 here, since
1392 this also turns off warnings about GCCs extension. */
1393 cpp_opts
->warn_variadic_macros
1394 = warn_variadic_macros
&& (pedantic
|| warn_traditional
);
1396 /* If we're generating preprocessor output, emit current directory
1397 if explicitly requested or if debugging information is enabled.
1398 ??? Maybe we should only do it for debugging formats that
1399 actually output the current directory? */
1400 if (flag_working_directory
== -1)
1401 flag_working_directory
= (debug_info_level
!= DINFO_LEVEL_NONE
);
1404 /* Add include path with a prefix at the front of its name. */
1406 add_prefixed_path (const char *suffix
, size_t chain
)
1410 size_t prefix_len
, suffix_len
;
1412 suffix_len
= strlen (suffix
);
1413 prefix
= iprefix
? iprefix
: cpp_GCC_INCLUDE_DIR
;
1414 prefix_len
= iprefix
? strlen (iprefix
) : cpp_GCC_INCLUDE_DIR_len
;
1416 path
= xmalloc (prefix_len
+ suffix_len
+ 1);
1417 memcpy (path
, prefix
, prefix_len
);
1418 memcpy (path
+ prefix_len
, suffix
, suffix_len
);
1419 path
[prefix_len
+ suffix_len
] = '\0';
1421 add_path (path
, chain
, 0, false);
1424 /* Handle -D, -U, -A, -imacros, and the first -include. */
1426 finish_options (void)
1428 if (!cpp_opts
->preprocessed
)
1432 cpp_change_file (parse_in
, LC_RENAME
, _("<built-in>"));
1433 cpp_init_builtins (parse_in
, flag_hosted
);
1434 c_cpp_builtins (parse_in
);
1436 /* We're about to send user input to cpplib, so make it warn for
1437 things that we previously (when we sent it internal definitions)
1438 told it to not warn.
1440 C99 permits implementation-defined characters in identifiers.
1441 The documented meaning of -std= is to turn off extensions that
1442 conflict with the specified standard, and since a strictly
1443 conforming program cannot contain a '$', we do not condition
1444 their acceptance on the -std= setting. */
1445 cpp_opts
->warn_dollars
= (cpp_opts
->pedantic
&& !cpp_opts
->c99
);
1447 cpp_change_file (parse_in
, LC_RENAME
, _("<command line>"));
1448 for (i
= 0; i
< deferred_count
; i
++)
1450 struct deferred_opt
*opt
= &deferred_opts
[i
];
1452 if (opt
->code
== OPT_D
)
1453 cpp_define (parse_in
, opt
->arg
);
1454 else if (opt
->code
== OPT_U
)
1455 cpp_undef (parse_in
, opt
->arg
);
1456 else if (opt
->code
== OPT_A
)
1458 if (opt
->arg
[0] == '-')
1459 cpp_unassert (parse_in
, opt
->arg
+ 1);
1461 cpp_assert (parse_in
, opt
->arg
);
1465 /* Handle -imacros after -D and -U. */
1466 for (i
= 0; i
< deferred_count
; i
++)
1468 struct deferred_opt
*opt
= &deferred_opts
[i
];
1470 if (opt
->code
== OPT_imacros
1471 && cpp_push_include (parse_in
, opt
->arg
))
1473 /* Disable push_command_line_include callback for now. */
1474 include_cursor
= deferred_count
+ 1;
1475 cpp_scan_nooutput (parse_in
);
1481 push_command_line_include ();
1484 /* Give CPP the next file given by -include, if any. */
1486 push_command_line_include (void)
1488 while (include_cursor
< deferred_count
)
1490 struct deferred_opt
*opt
= &deferred_opts
[include_cursor
++];
1492 if (! cpp_opts
->preprocessed
&& opt
->code
== OPT_include
1493 && cpp_push_include (parse_in
, opt
->arg
))
1497 if (include_cursor
== deferred_count
)
1500 /* -Wunused-macros should only warn about macros defined hereafter. */
1501 cpp_opts
->warn_unused_macros
= warn_unused_macros
;
1502 /* Restore the line map from <command line>. */
1503 if (! cpp_opts
->preprocessed
)
1504 cpp_change_file (parse_in
, LC_RENAME
, main_input_filename
);
1506 /* Set this here so the client can change the option if it wishes,
1507 and after stacking the main file so we don't trace the main file. */
1508 line_table
.trace_includes
= cpp_opts
->print_include_names
;
1512 /* File change callback. Has to handle -include files. */
1514 cb_file_change (cpp_reader
*pfile ATTRIBUTE_UNUSED
,
1515 const struct line_map
*new_map
)
1517 if (flag_preprocess_only
)
1518 pp_file_change (new_map
);
1520 fe_file_change (new_map
);
1522 if (new_map
== 0 || (new_map
->reason
== LC_LEAVE
&& MAIN_FILE_P (new_map
)))
1523 push_command_line_include ();
1527 cb_dir_change (cpp_reader
*pfile ATTRIBUTE_UNUSED
, const char *dir
)
1529 if (! set_src_pwd (dir
))
1530 warning ("too late for # directive to set debug directory");
1533 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1534 extensions if ISO). There is no concept of gnu94. */
1536 set_std_c89 (int c94
, int iso
)
1538 cpp_set_lang (parse_in
, c94
? CLK_STDC94
: iso
? CLK_STDC89
: CLK_GNUC89
);
1541 flag_no_gnu_keywords
= iso
;
1542 flag_no_nonansi_builtin
= iso
;
1547 /* Set the C 99 standard (without GNU extensions if ISO). */
1549 set_std_c99 (int iso
)
1551 cpp_set_lang (parse_in
, iso
? CLK_STDC99
: CLK_GNUC99
);
1553 flag_no_nonansi_builtin
= iso
;
1559 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1561 set_std_cxx98 (int iso
)
1563 cpp_set_lang (parse_in
, iso
? CLK_CXX98
: CLK_GNUCXX
);
1564 flag_no_gnu_keywords
= iso
;
1565 flag_no_nonansi_builtin
= iso
;
1569 /* Handle setting implicit to ON. */
1571 set_Wimplicit (int on
)
1574 warn_implicit_int
= on
;
1577 if (mesg_implicit_function_declaration
!= 2)
1578 mesg_implicit_function_declaration
= 1;
1581 mesg_implicit_function_declaration
= 0;
1584 /* Args to -d specify what to dump. Silently ignore
1585 unrecognized options; they may be aimed at toplev.c. */
1587 handle_OPT_d (const char *arg
)
1591 while ((c
= *arg
++) != '\0')
1594 case 'M': /* Dump macros only. */
1595 case 'N': /* Dump names. */
1596 case 'D': /* Dump definitions. */
1597 flag_dump_macros
= c
;
1601 flag_dump_includes
= 1;