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)
55 static cpp_options
*cpp_opts
;
58 static const char *this_input_filename
;
60 /* Filename and stream for preprocessed output. */
61 static const char *out_fname
;
62 static FILE *out_stream
;
64 /* Append dependencies to deps_file. */
65 static bool deps_append
;
67 /* If dependency switches (-MF etc.) have been given. */
68 static bool deps_seen
;
73 /* Dependency output file. */
74 static const char *deps_file
;
76 /* The prefix given by -iprefix, if any. */
77 static const char *iprefix
;
79 /* The system root, if any. Overridden by -isysroot. */
80 static const char *sysroot
= TARGET_SYSTEM_ROOT
;
82 /* Zero disables all standard directories for headers. */
83 static bool std_inc
= true;
85 /* Zero disables the C++-specific standard directories for headers. */
86 static bool std_cxx_inc
= true;
88 /* If the quote chain has been split by -I-. */
89 static bool quote_chain_split
;
91 /* If -Wunused-macros. */
92 static bool warn_unused_macros
;
94 /* If -Wvariadic-macros. */
95 static bool warn_variadic_macros
= true;
97 /* Number of deferred options. */
98 static size_t deferred_count
;
100 /* Number of deferred options scanned for -include. */
101 static size_t include_cursor
;
103 /* Permit Fortran front-end options. */
104 static bool permit_fortran_options
;
106 static void set_Wimplicit (int);
107 static void handle_OPT_d (const char *);
108 static void set_std_cxx98 (int);
109 static void set_std_c89 (int, int);
110 static void set_std_c99 (int);
111 static void check_deps_environment_vars (void);
112 static void handle_deferred_opts (void);
113 static void sanitize_cpp_opts (void);
114 static void add_prefixed_path (const char *, size_t);
115 static void push_command_line_include (void);
116 static void cb_file_change (cpp_reader
*, const struct line_map
*);
117 static void cb_dir_change (cpp_reader
*, const char *);
118 static void finish_options (void);
120 #ifndef STDC_0_IN_SYSTEM_HEADERS
121 #define STDC_0_IN_SYSTEM_HEADERS 0
124 /* Holds switches parsed by c_common_handle_option (), but whose
125 handling is deferred to c_common_post_options (). */
126 static void defer_opt (enum opt_code
, const char *);
127 static struct deferred_opt
133 /* Complain that switch CODE expects an argument but none was
134 provided. OPT was the command-line option. Return FALSE to get
135 the default message in opts.c, TRUE if we provide a specialized
138 c_common_missing_argument (const char *opt
, size_t code
)
143 /* Pick up the default message. */
146 case OPT_fconstant_string_class_
:
147 error ("no class name specified with \"%s\"", opt
);
151 error ("assertion missing after \"%s\"", opt
);
156 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 ** ARG_UNUSED (argv
))
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
= XNEWVEC (struct deferred_opt
, argc
);
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 if (cl_options
[code
].flags
& (CL_C
| CL_CXX
| CL_ObjC
| CL_ObjCXX
))
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
);
365 set_Wimplicit (value
);
366 warn_char_subscripts
= value
;
367 warn_missing_braces
= value
;
368 warn_parentheses
= value
;
369 warn_return_type
= value
;
370 warn_sequence_point
= value
; /* Was C only. */
371 if (c_dialect_cxx ())
372 warn_sign_compare
= value
;
374 warn_strict_aliasing
= value
;
376 /* Only warn about unknown pragmas that are not in system
378 warn_unknown_pragmas
= value
;
380 /* We save the value of warn_uninitialized, since if they put
381 -Wuninitialized on the command line, we need to generate a
382 warning about not using it without also specifying -O. */
383 if (warn_uninitialized
!= 1)
384 warn_uninitialized
= (value
? 2 : 0);
386 if (!c_dialect_cxx ())
387 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding
388 can turn it off only if it's not explicit. */
389 warn_main
= value
* 2;
392 /* C++-specific warnings. */
393 warn_nonvdtor
= value
;
394 warn_reorder
= value
;
395 warn_nontemplate_friend
= value
;
398 cpp_opts
->warn_trigraphs
= value
;
399 cpp_opts
->warn_comments
= value
;
400 cpp_opts
->warn_num_sign_change
= value
;
401 cpp_opts
->warn_multichar
= value
; /* Was C++ only. */
406 cpp_opts
->warn_comments
= value
;
409 case OPT_Wdeprecated
:
410 cpp_opts
->warn_deprecated
= value
;
413 case OPT_Wdiv_by_zero
:
414 warn_div_by_zero
= value
;
417 case OPT_Wendif_labels
:
418 cpp_opts
->warn_endif_labels
= value
;
422 cpp_opts
->warnings_are_errors
= value
;
425 case OPT_Werror_implicit_function_declaration
:
426 mesg_implicit_function_declaration
= 2;
434 set_Wformat (atoi (arg
));
438 set_Wimplicit (value
);
442 /* Silently ignore for now. */
445 case OPT_Winvalid_pch
:
446 cpp_opts
->warn_invalid_pch
= value
;
456 case OPT_Wmissing_include_dirs
:
457 cpp_opts
->warn_missing_include_dirs
= value
;
461 cpp_opts
->warn_multichar
= value
;
464 case OPT_Wreturn_type
:
465 warn_return_type
= value
;
468 case OPT_Wsystem_headers
:
469 cpp_opts
->warn_system_headers
= value
;
472 case OPT_Wtraditional
:
473 cpp_opts
->warn_traditional
= value
;
477 cpp_opts
->warn_trigraphs
= value
;
481 cpp_opts
->warn_undef
= value
;
484 case OPT_Wunknown_pragmas
:
485 /* Set to greater than 1, so that even unknown pragmas in
486 system headers will be warned about. */
487 warn_unknown_pragmas
= value
* 2;
490 case OPT_Wunused_macros
:
491 warn_unused_macros
= value
;
494 case OPT_Wvariadic_macros
:
495 warn_variadic_macros
= value
;
498 case OPT_Wwrite_strings
:
499 if (!c_dialect_cxx ())
500 flag_const_strings
= value
;
502 warn_write_strings
= value
;
506 if (!c_dialect_cxx ())
507 set_std_c89 (false, true);
509 set_std_cxx98 (true);
516 case OPT_fcond_mismatch
:
517 if (!c_dialect_cxx ())
519 flag_cond_mismatch
= value
;
524 case OPT_fall_virtual
:
525 case OPT_falt_external_templates
:
526 case OPT_fenum_int_equiv
:
527 case OPT_fexternal_templates
:
528 case OPT_fguiding_decls
:
530 case OPT_fhuge_objects
:
532 case OPT_fname_mangling_version_
:
534 case OPT_fnonnull_objects
:
536 case OPT_fstrict_prototype
:
537 case OPT_fthis_is_variable
:
538 case OPT_fvtable_thunks
:
541 warning ("switch \"%s\" is no longer supported", option
->opt_text
);
544 case OPT_faccess_control
:
545 flag_access_control
= value
;
549 flag_no_asm
= !value
;
553 flag_no_builtin
= !value
;
560 disable_builtin_function (arg
);
563 case OPT_fdollars_in_identifiers
:
564 cpp_opts
->dollars_in_ident
= value
;
567 case OPT_ffreestanding
:
569 /* Fall through.... */
572 flag_no_builtin
= !value
;
573 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
574 if (!value
&& warn_main
== 2)
578 case OPT_fshort_double
:
579 flag_short_double
= value
;
582 case OPT_fshort_enums
:
583 flag_short_enums
= value
;
586 case OPT_fshort_wchar
:
587 flag_short_wchar
= value
;
590 case OPT_fsigned_bitfields
:
591 flag_signed_bitfields
= value
;
592 explicit_flag_signed_bitfields
= 1;
595 case OPT_fsigned_char
:
596 flag_signed_char
= value
;
599 case OPT_funsigned_bitfields
:
600 flag_signed_bitfields
= !value
;
601 explicit_flag_signed_bitfields
= 1;
604 case OPT_funsigned_char
:
605 flag_signed_char
= !value
;
609 flag_check_new
= value
;
612 case OPT_fconserve_space
:
613 flag_conserve_space
= value
;
616 case OPT_fconst_strings
:
617 flag_const_strings
= value
;
620 case OPT_fconstant_string_class_
:
621 constant_string_class_name
= arg
;
624 case OPT_fdefault_inline
:
625 flag_default_inline
= value
;
628 case OPT_felide_constructors
:
629 flag_elide_constructors
= value
;
632 case OPT_fenforce_eh_specs
:
633 flag_enforce_eh_specs
= value
;
636 case OPT_ffixed_form
:
637 case OPT_ffixed_line_length_
:
638 /* Fortran front end options ignored when preprocessing only. */
639 if (!flag_preprocess_only
)
644 flag_new_for_scope
= value
;
647 case OPT_fgnu_keywords
:
648 flag_no_gnu_keywords
= !value
;
651 case OPT_fgnu_runtime
:
652 flag_next_runtime
= !value
;
655 case OPT_fhandle_exceptions
:
656 warning ("-fhandle-exceptions has been renamed -fexceptions (and is now on by default)");
657 flag_exceptions
= value
;
660 case OPT_fimplement_inlines
:
661 flag_implement_inlines
= value
;
664 case OPT_fimplicit_inline_templates
:
665 flag_implicit_inline_templates
= value
;
668 case OPT_fimplicit_templates
:
669 flag_implicit_templates
= value
;
672 case OPT_fms_extensions
:
673 flag_ms_extensions
= value
;
676 case OPT_fnext_runtime
:
677 flag_next_runtime
= value
;
680 case OPT_fnil_receivers
:
681 flag_nil_receivers
= value
;
684 case OPT_fnonansi_builtins
:
685 flag_no_nonansi_builtin
= !value
;
688 case OPT_fobjc_exceptions
:
689 flag_objc_exceptions
= value
;
692 case OPT_fobjc_sjlj_exceptions
:
693 flag_objc_sjlj_exceptions
= value
;
696 case OPT_foperator_names
:
697 cpp_opts
->operator_names
= value
;
700 case OPT_foptional_diags
:
701 flag_optional_diags
= value
;
705 cpp_opts
->restore_pch_deps
= value
;
708 case OPT_fpch_preprocess
:
709 flag_pch_preprocess
= value
;
712 case OPT_fpermissive
:
713 flag_permissive
= value
;
716 case OPT_fpreprocessed
:
717 cpp_opts
->preprocessed
= value
;
720 case OPT_freplace_objc_classes
:
721 flag_replace_objc_classes
= value
;
725 flag_use_repository
= value
;
727 flag_implicit_templates
= 0;
734 case OPT_fshow_column
:
735 cpp_opts
->show_column
= value
;
739 flag_detailed_statistics
= value
;
743 /* It is documented that we silently ignore silly values. */
744 if (value
>= 1 && value
<= 100)
745 cpp_opts
->tabstop
= value
;
748 case OPT_fexec_charset_
:
749 cpp_opts
->narrow_charset
= arg
;
752 case OPT_fwide_exec_charset_
:
753 cpp_opts
->wide_charset
= arg
;
756 case OPT_finput_charset_
:
757 cpp_opts
->input_charset
= arg
;
760 case OPT_ftemplate_depth_
:
761 max_tinst_depth
= value
;
764 case OPT_fuse_cxa_atexit
:
765 flag_use_cxa_atexit
= value
;
768 case OPT_fvisibility_inlines_hidden
:
769 visibility_options
.inlines_hidden
= value
;
777 flag_zero_link
= value
;
781 flag_gen_declaration
= 1;
785 add_path (xstrdup (arg
), AFTER
, 0, true);
790 defer_opt (code
, arg
);
798 add_path (xstrdup (arg
), QUOTE
, 0, true);
806 add_path (xstrdup (arg
), SYSTEM
, 0, true);
809 case OPT_iwithprefix
:
810 add_prefixed_path (arg
, SYSTEM
);
813 case OPT_iwithprefixbefore
:
814 add_prefixed_path (arg
, BRACKET
);
818 cpp_set_lang (parse_in
, CLK_ASM
);
819 cpp_opts
->dollars_in_ident
= false;
838 error ("output filename specified twice");
841 /* We need to handle the -pedantic switches here, rather than in
842 c_common_post_options, so that a subsequent -Wno-endif-labels
843 is not overridden. */
844 case OPT_pedantic_errors
:
845 cpp_opts
->pedantic_errors
= 1;
848 cpp_opts
->pedantic
= 1;
849 cpp_opts
->warn_endif_labels
= 1;
852 case OPT_print_objc_runtime_info
:
853 print_struct_values
= 1;
861 case OPT_std_gnu__98
:
862 set_std_cxx98 (code
== OPT_std_c__98
/* ISO */);
866 case OPT_std_iso9899_1990
:
867 case OPT_std_iso9899_199409
:
868 set_std_c89 (code
== OPT_std_iso9899_199409
/* c94 */, true /* ISO */);
872 set_std_c89 (false /* c94 */, false /* ISO */);
877 case OPT_std_iso9899_1999
:
878 case OPT_std_iso9899_199x
:
879 set_std_c99 (true /* ISO */);
884 set_std_c99 (false /* ISO */);
888 cpp_opts
->trigraphs
= 1;
891 case OPT_traditional_cpp
:
892 cpp_opts
->traditional
= 1;
900 cpp_opts
->inhibit_warnings
= 1;
911 /* Post-switch processing. */
913 c_common_post_options (const char **pfilename
)
915 struct cpp_callbacks
*cb
;
917 /* Canonicalize the input and output filenames. */
918 if (in_fnames
== NULL
)
920 in_fnames
= XNEWVEC (const char *, 1);
923 else if (strcmp (in_fnames
[0], "-") == 0)
926 if (out_fname
== NULL
|| !strcmp (out_fname
, "-"))
929 if (cpp_opts
->deps
.style
== DEPS_NONE
)
930 check_deps_environment_vars ();
932 handle_deferred_opts ();
934 sanitize_cpp_opts ();
936 register_include_chains (parse_in
, sysroot
, iprefix
,
937 std_inc
, std_cxx_inc
&& c_dialect_cxx (), verbose
);
939 flag_inline_trees
= 1;
941 /* Use tree inlining. */
944 if (flag_inline_functions
)
946 flag_inline_trees
= 2;
947 flag_inline_functions
= 0;
950 /* If we are given more than one input file, we must use
951 unit-at-a-time mode. */
952 if (num_in_fnames
> 1)
953 flag_unit_at_a_time
= 1;
955 /* Default to ObjC sjlj exception handling if NeXT runtime. */
956 if (flag_objc_sjlj_exceptions
< 0)
957 flag_objc_sjlj_exceptions
= flag_next_runtime
;
958 if (flag_objc_exceptions
&& !flag_objc_sjlj_exceptions
)
961 /* -Wextra implies -Wsign-compare, but not if explicitly
963 if (warn_sign_compare
== -1)
964 warn_sign_compare
= extra_warnings
;
966 /* Special format checking options don't work without -Wformat; warn if
968 if (warn_format_y2k
&& !warn_format
)
969 warning ("-Wformat-y2k ignored without -Wformat");
970 if (warn_format_extra_args
&& !warn_format
)
971 warning ("-Wformat-extra-args ignored without -Wformat");
972 if (warn_format_zero_length
&& !warn_format
)
973 warning ("-Wformat-zero-length ignored without -Wformat");
974 if (warn_format_nonliteral
&& !warn_format
)
975 warning ("-Wformat-nonliteral ignored without -Wformat");
976 if (warn_format_security
&& !warn_format
)
977 warning ("-Wformat-security ignored without -Wformat");
978 if (warn_missing_format_attribute
&& !warn_format
)
979 warning ("-Wmissing-format-attribute ignored without -Wformat");
981 if (flag_preprocess_only
)
983 /* Open the output now. We must do so even if flag_no_output is
984 on, because there may be other output than from the actual
985 preprocessing (e.g. from -dM). */
986 if (out_fname
[0] == '\0')
989 out_stream
= fopen (out_fname
, "w");
991 if (out_stream
== NULL
)
993 fatal_error ("opening output file %s: %m", out_fname
);
997 if (num_in_fnames
> 1)
998 error ("too many filenames given. Type %s --help for usage",
1001 init_pp_output (out_stream
);
1007 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1008 input_location
= UNKNOWN_LOCATION
;
1011 cb
= cpp_get_callbacks (parse_in
);
1012 cb
->file_change
= cb_file_change
;
1013 cb
->dir_change
= cb_dir_change
;
1014 cpp_post_options (parse_in
);
1016 input_location
= UNKNOWN_LOCATION
;
1018 /* If an error has occurred in cpplib, note it so we fail
1020 errorcount
+= cpp_errors (parse_in
);
1022 *pfilename
= this_input_filename
1023 = cpp_read_main_file (parse_in
, in_fnames
[0]);
1024 /* Don't do any compilation or preprocessing if there is no input file. */
1025 if (this_input_filename
== NULL
)
1031 if (flag_working_directory
1032 && flag_preprocess_only
&& ! flag_no_line_commands
)
1033 pp_dir_change (parse_in
, get_src_pwd ());
1035 return flag_preprocess_only
;
1038 /* Front end initialization common to C, ObjC and C++. */
1040 c_common_init (void)
1042 /* Set up preprocessor arithmetic. Must be done after call to
1043 c_common_nodes_and_builtins for type nodes to be good. */
1044 cpp_opts
->precision
= TYPE_PRECISION (intmax_type_node
);
1045 cpp_opts
->char_precision
= TYPE_PRECISION (char_type_node
);
1046 cpp_opts
->int_precision
= TYPE_PRECISION (integer_type_node
);
1047 cpp_opts
->wchar_precision
= TYPE_PRECISION (wchar_type_node
);
1048 cpp_opts
->unsigned_wchar
= TYPE_UNSIGNED (wchar_type_node
);
1049 cpp_opts
->bytes_big_endian
= BYTES_BIG_ENDIAN
;
1051 /* This can't happen until after wchar_precision and bytes_big_endian
1053 cpp_init_iconv (parse_in
);
1055 if (flag_preprocess_only
)
1058 preprocess_file (parse_in
);
1062 /* Has to wait until now so that cpplib has its hash table. */
1068 /* Initialize the integrated preprocessor after debug output has been
1069 initialized; loop over each input file. */
1071 c_common_parse_file (int set_yydebug
)
1075 /* Enable parser debugging, if requested and we can. If requested
1076 and we can't, notify the user. */
1078 yydebug
= set_yydebug
;
1081 warning ("YYDEBUG was not defined at build time, -dy ignored");
1094 if (++i
>= num_in_fnames
)
1096 cpp_undef_all (parse_in
);
1098 = cpp_read_main_file (parse_in
, in_fnames
[i
]);
1099 /* If an input file is missing, abandon further compilation.
1100 cpplib has issued a diagnostic. */
1101 if (!this_input_filename
)
1106 /* Common finish hook for the C, ObjC and C++ front ends. */
1108 c_common_finish (void)
1110 FILE *deps_stream
= NULL
;
1112 if (cpp_opts
->deps
.style
!= DEPS_NONE
)
1114 /* If -M or -MM was seen without -MF, default output to the
1117 deps_stream
= out_stream
;
1120 deps_stream
= fopen (deps_file
, deps_append
? "a": "w");
1122 fatal_error ("opening dependency file %s: %m", deps_file
);
1126 /* For performance, avoid tearing down cpplib's internal structures
1127 with cpp_destroy (). */
1128 errorcount
+= cpp_finish (parse_in
, deps_stream
);
1130 if (deps_stream
&& deps_stream
!= out_stream
1131 && (ferror (deps_stream
) || fclose (deps_stream
)))
1132 fatal_error ("closing dependency file %s: %m", deps_file
);
1134 if (out_stream
&& (ferror (out_stream
) || fclose (out_stream
)))
1135 fatal_error ("when writing output to %s: %m", out_fname
);
1138 /* Either of two environment variables can specify output of
1139 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1140 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1141 and DEPS_TARGET is the target to mention in the deps. They also
1142 result in dependency information being appended to the output file
1143 rather than overwriting it, and like Sun's compiler
1144 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1146 check_deps_environment_vars (void)
1150 GET_ENVIRONMENT (spec
, "DEPENDENCIES_OUTPUT");
1152 cpp_opts
->deps
.style
= DEPS_USER
;
1155 GET_ENVIRONMENT (spec
, "SUNPRO_DEPENDENCIES");
1158 cpp_opts
->deps
.style
= DEPS_SYSTEM
;
1159 cpp_opts
->deps
.ignore_main_file
= true;
1165 /* Find the space before the DEPS_TARGET, if there is one. */
1166 char *s
= strchr (spec
, ' ');
1169 /* Let the caller perform MAKE quoting. */
1170 defer_opt (OPT_MT
, s
+ 1);
1174 /* Command line -MF overrides environment variables and default. */
1182 /* Handle deferred command line switches. */
1184 handle_deferred_opts (void)
1189 /* Avoid allocating the deps buffer if we don't need it.
1190 (This flag may be true without there having been -MT or -MQ
1191 options, but we'll still need the deps buffer.) */
1195 deps
= cpp_get_deps (parse_in
);
1197 for (i
= 0; i
< deferred_count
; i
++)
1199 struct deferred_opt
*opt
= &deferred_opts
[i
];
1201 if (opt
->code
== OPT_MT
|| opt
->code
== OPT_MQ
)
1202 deps_add_target (deps
, opt
->arg
, opt
->code
== OPT_MQ
);
1206 /* These settings are appropriate for GCC, but not necessarily so for
1207 cpplib as a library. */
1209 sanitize_cpp_opts (void)
1211 /* If we don't know what style of dependencies to output, complain
1212 if any other dependency switches have been given. */
1213 if (deps_seen
&& cpp_opts
->deps
.style
== DEPS_NONE
)
1214 error ("to generate dependencies you must specify either -M or -MM");
1216 /* -dM and dependencies suppress normal output; do it here so that
1217 the last -d[MDN] switch overrides earlier ones. */
1218 if (flag_dump_macros
== 'M')
1221 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1222 -dM since at least glibc relies on -M -dM to work. */
1225 if (flag_dump_macros
!= 'M')
1226 flag_dump_macros
= 0;
1227 flag_dump_includes
= 0;
1230 cpp_opts
->unsigned_char
= !flag_signed_char
;
1231 cpp_opts
->stdc_0_in_system_headers
= STDC_0_IN_SYSTEM_HEADERS
;
1233 /* We want -Wno-long-long to override -pedantic -std=non-c99
1234 and/or -Wtraditional, whatever the ordering. */
1235 cpp_opts
->warn_long_long
1236 = warn_long_long
&& ((!flag_isoc99
&& pedantic
) || warn_traditional
);
1238 /* Similarly with -Wno-variadic-macros. No check for c99 here, since
1239 this also turns off warnings about GCCs extension. */
1240 cpp_opts
->warn_variadic_macros
1241 = warn_variadic_macros
&& (pedantic
|| warn_traditional
);
1243 /* If we're generating preprocessor output, emit current directory
1244 if explicitly requested or if debugging information is enabled.
1245 ??? Maybe we should only do it for debugging formats that
1246 actually output the current directory? */
1247 if (flag_working_directory
== -1)
1248 flag_working_directory
= (debug_info_level
!= DINFO_LEVEL_NONE
);
1251 /* Add include path with a prefix at the front of its name. */
1253 add_prefixed_path (const char *suffix
, size_t chain
)
1257 size_t prefix_len
, suffix_len
;
1259 suffix_len
= strlen (suffix
);
1260 prefix
= iprefix
? iprefix
: cpp_GCC_INCLUDE_DIR
;
1261 prefix_len
= iprefix
? strlen (iprefix
) : cpp_GCC_INCLUDE_DIR_len
;
1263 path
= (char *) xmalloc (prefix_len
+ suffix_len
+ 1);
1264 memcpy (path
, prefix
, prefix_len
);
1265 memcpy (path
+ prefix_len
, suffix
, suffix_len
);
1266 path
[prefix_len
+ suffix_len
] = '\0';
1268 add_path (path
, chain
, 0, false);
1271 /* Handle -D, -U, -A, -imacros, and the first -include. */
1273 finish_options (void)
1275 if (!cpp_opts
->preprocessed
)
1279 cpp_change_file (parse_in
, LC_RENAME
, _("<built-in>"));
1280 cpp_init_builtins (parse_in
, flag_hosted
);
1281 c_cpp_builtins (parse_in
);
1283 /* We're about to send user input to cpplib, so make it warn for
1284 things that we previously (when we sent it internal definitions)
1285 told it to not warn.
1287 C99 permits implementation-defined characters in identifiers.
1288 The documented meaning of -std= is to turn off extensions that
1289 conflict with the specified standard, and since a strictly
1290 conforming program cannot contain a '$', we do not condition
1291 their acceptance on the -std= setting. */
1292 cpp_opts
->warn_dollars
= (cpp_opts
->pedantic
&& !cpp_opts
->c99
);
1294 cpp_change_file (parse_in
, LC_RENAME
, _("<command line>"));
1295 for (i
= 0; i
< deferred_count
; i
++)
1297 struct deferred_opt
*opt
= &deferred_opts
[i
];
1299 if (opt
->code
== OPT_D
)
1300 cpp_define (parse_in
, opt
->arg
);
1301 else if (opt
->code
== OPT_U
)
1302 cpp_undef (parse_in
, opt
->arg
);
1303 else if (opt
->code
== OPT_A
)
1305 if (opt
->arg
[0] == '-')
1306 cpp_unassert (parse_in
, opt
->arg
+ 1);
1308 cpp_assert (parse_in
, opt
->arg
);
1312 /* Handle -imacros after -D and -U. */
1313 for (i
= 0; i
< deferred_count
; i
++)
1315 struct deferred_opt
*opt
= &deferred_opts
[i
];
1317 if (opt
->code
== OPT_imacros
1318 && cpp_push_include (parse_in
, opt
->arg
))
1320 /* Disable push_command_line_include callback for now. */
1321 include_cursor
= deferred_count
+ 1;
1322 cpp_scan_nooutput (parse_in
);
1328 push_command_line_include ();
1331 /* Give CPP the next file given by -include, if any. */
1333 push_command_line_include (void)
1335 while (include_cursor
< deferred_count
)
1337 struct deferred_opt
*opt
= &deferred_opts
[include_cursor
++];
1339 if (! cpp_opts
->preprocessed
&& opt
->code
== OPT_include
1340 && cpp_push_include (parse_in
, opt
->arg
))
1344 if (include_cursor
== deferred_count
)
1347 /* -Wunused-macros should only warn about macros defined hereafter. */
1348 cpp_opts
->warn_unused_macros
= warn_unused_macros
;
1349 /* Restore the line map from <command line>. */
1350 if (! cpp_opts
->preprocessed
)
1351 cpp_change_file (parse_in
, LC_RENAME
, main_input_filename
);
1353 /* Set this here so the client can change the option if it wishes,
1354 and after stacking the main file so we don't trace the main file. */
1355 line_table
.trace_includes
= cpp_opts
->print_include_names
;
1359 /* File change callback. Has to handle -include files. */
1361 cb_file_change (cpp_reader
* ARG_UNUSED (pfile
),
1362 const struct line_map
*new_map
)
1364 if (flag_preprocess_only
)
1365 pp_file_change (new_map
);
1367 fe_file_change (new_map
);
1369 if (new_map
== 0 || (new_map
->reason
== LC_LEAVE
&& MAIN_FILE_P (new_map
)))
1370 push_command_line_include ();
1374 cb_dir_change (cpp_reader
* ARG_UNUSED (pfile
), const char *dir
)
1376 if (! set_src_pwd (dir
))
1377 warning ("too late for # directive to set debug directory");
1380 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1381 extensions if ISO). There is no concept of gnu94. */
1383 set_std_c89 (int c94
, int iso
)
1385 cpp_set_lang (parse_in
, c94
? CLK_STDC94
: iso
? CLK_STDC89
: CLK_GNUC89
);
1388 flag_no_gnu_keywords
= iso
;
1389 flag_no_nonansi_builtin
= iso
;
1394 /* Set the C 99 standard (without GNU extensions if ISO). */
1396 set_std_c99 (int iso
)
1398 cpp_set_lang (parse_in
, iso
? CLK_STDC99
: CLK_GNUC99
);
1400 flag_no_nonansi_builtin
= iso
;
1406 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1408 set_std_cxx98 (int iso
)
1410 cpp_set_lang (parse_in
, iso
? CLK_CXX98
: CLK_GNUCXX
);
1411 flag_no_gnu_keywords
= iso
;
1412 flag_no_nonansi_builtin
= iso
;
1416 /* Handle setting implicit to ON. */
1418 set_Wimplicit (int on
)
1421 warn_implicit_int
= on
;
1424 if (mesg_implicit_function_declaration
!= 2)
1425 mesg_implicit_function_declaration
= 1;
1428 mesg_implicit_function_declaration
= 0;
1431 /* Args to -d specify what to dump. Silently ignore
1432 unrecognized options; they may be aimed at toplev.c. */
1434 handle_OPT_d (const char *arg
)
1438 while ((c
= *arg
++) != '\0')
1441 case 'M': /* Dump macros only. */
1442 case 'N': /* Dump names. */
1443 case 'D': /* Dump definitions. */
1444 flag_dump_macros
= c
;
1448 flag_dump_includes
= 1;