1 /* C/ObjC/C++ command line option handling.
2 Copyright (C) 2002, 2003, 2004, 2005 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 static void set_Wimplicit (int);
104 static void handle_OPT_d (const char *);
105 static void set_std_cxx98 (int);
106 static void set_std_c89 (int, int);
107 static void set_std_c99 (int);
108 static void check_deps_environment_vars (void);
109 static void handle_deferred_opts (void);
110 static void sanitize_cpp_opts (void);
111 static void add_prefixed_path (const char *, size_t);
112 static void push_command_line_include (void);
113 static void cb_file_change (cpp_reader
*, const struct line_map
*);
114 static void cb_dir_change (cpp_reader
*, const char *);
115 static void finish_options (void);
117 #ifndef STDC_0_IN_SYSTEM_HEADERS
118 #define STDC_0_IN_SYSTEM_HEADERS 0
121 /* Holds switches parsed by c_common_handle_option (), but whose
122 handling is deferred to c_common_post_options (). */
123 static void defer_opt (enum opt_code
, const char *);
124 static struct deferred_opt
130 /* Complain that switch CODE expects an argument but none was
131 provided. OPT was the command-line option. Return FALSE to get
132 the default message in opts.c, TRUE if we provide a specialized
135 c_common_missing_argument (const char *opt
, size_t code
)
140 /* Pick up the default message. */
143 case OPT_fconstant_string_class_
:
144 error ("no class name specified with %qs", opt
);
148 error ("assertion missing after %qs", opt
);
153 error ("macro name missing after %qs", opt
);
162 error ("missing path after %qs", opt
);
171 error ("missing filename after %qs", opt
);
176 error ("missing makefile target after %qs", opt
);
183 /* Defer option CODE with argument ARG. */
185 defer_opt (enum opt_code code
, const char *arg
)
187 deferred_opts
[deferred_count
].code
= code
;
188 deferred_opts
[deferred_count
].arg
= arg
;
192 /* Common initialization before parsing options. */
194 c_common_init_options (unsigned int argc
, const char **argv
)
196 static const unsigned int lang_flags
[] = {CL_C
, CL_ObjC
, CL_CXX
, CL_ObjCXX
};
197 unsigned int i
, result
;
199 /* This is conditionalized only because that is the way the front
200 ends used to do it. Maybe this should be unconditional? */
201 if (c_dialect_cxx ())
203 /* By default wrap lines at 80 characters. Is getenv
204 ("COLUMNS") preferable? */
205 diagnostic_line_cutoff (global_dc
) = 80;
206 /* By default, emit location information once for every
207 diagnostic message. */
208 diagnostic_prefixing_rule (global_dc
) = DIAGNOSTICS_SHOW_PREFIX_ONCE
;
211 parse_in
= cpp_create_reader (c_dialect_cxx () ? CLK_GNUCXX
: CLK_GNUC89
,
212 ident_hash
, &line_table
);
214 cpp_opts
= cpp_get_options (parse_in
);
215 cpp_opts
->dollars_in_ident
= DOLLARS_IN_IDENTIFIERS
;
216 cpp_opts
->objc
= c_dialect_objc ();
218 /* Reset to avoid warnings on internal definitions. We set it just
219 before passing on command-line options to cpplib. */
220 cpp_opts
->warn_dollars
= 0;
222 flag_const_strings
= c_dialect_cxx ();
223 flag_exceptions
= c_dialect_cxx ();
224 warn_pointer_arith
= c_dialect_cxx ();
226 deferred_opts
= XNEWVEC (struct deferred_opt
, argc
);
228 result
= lang_flags
[c_language
];
230 if (c_language
== clk_c
)
232 /* If preprocessing assembly language, accept any of the C-family
233 front end options since the driver may pass them through. */
234 for (i
= 1; i
< argc
; i
++)
235 if (! strcmp (argv
[i
], "-lang-asm"))
237 result
|= CL_C
| CL_ObjC
| CL_CXX
| CL_ObjCXX
;
245 /* Handle switch SCODE with argument ARG. VALUE is true, unless no-
246 form of an -f or -W option was given. Returns 0 if the switch was
247 invalid, a negative number to prevent language-independent
248 processing in toplev.c (a hack necessary for the short-term). */
250 c_common_handle_option (size_t scode
, const char *arg
, int value
)
252 const struct cl_option
*option
= &cl_options
[scode
];
253 enum opt_code code
= (enum opt_code
) scode
;
259 if (cl_options
[code
].flags
& (CL_C
| CL_CXX
| CL_ObjC
| CL_ObjCXX
))
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, true);
302 if (quote_chain_split
)
303 error ("-I- specified twice");
304 quote_chain_split
= true;
305 split_quote_chain ();
306 inform ("obsolete option -I- used, please use -iquote instead");
312 /* When doing dependencies with -M or -MM, suppress normal
313 preprocessed output, but still do -dM etc. as software
314 depends on this. Preprocessed output does occur if -MD, -MMD
315 or environment var dependency generation is used. */
316 cpp_opts
->deps
.style
= (code
== OPT_M
? DEPS_SYSTEM
: DEPS_USER
);
318 cpp_opts
->inhibit_warnings
= 1;
323 cpp_opts
->deps
.style
= (code
== OPT_MD
? DEPS_SYSTEM
: DEPS_USER
);
334 cpp_opts
->deps
.missing_files
= true;
339 cpp_opts
->deps
.phony_targets
= true;
345 defer_opt (code
, arg
);
349 flag_no_line_commands
= 1;
352 case OPT_fworking_directory
:
353 flag_working_directory
= value
;
357 defer_opt (code
, arg
);
363 set_Wimplicit (value
);
364 warn_char_subscripts
= value
;
365 warn_missing_braces
= value
;
366 warn_parentheses
= value
;
367 warn_return_type
= value
;
368 warn_sequence_point
= value
; /* Was C only. */
369 if (c_dialect_cxx ())
370 warn_sign_compare
= value
;
372 warn_strict_aliasing
= value
;
374 /* Only warn about unknown pragmas that are not in system
376 warn_unknown_pragmas
= value
;
378 /* We save the value of warn_uninitialized, since if they put
379 -Wuninitialized on the command line, we need to generate a
380 warning about not using it without also specifying -O. */
381 if (warn_uninitialized
!= 1)
382 warn_uninitialized
= (value
? 2 : 0);
384 if (!c_dialect_cxx ())
385 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding
386 can turn it off only if it's not explicit. */
387 warn_main
= value
* 2;
390 /* C++-specific warnings. */
391 warn_nonvdtor
= value
;
392 warn_reorder
= value
;
393 warn_nontemplate_friend
= value
;
396 cpp_opts
->warn_trigraphs
= value
;
397 cpp_opts
->warn_comments
= value
;
398 cpp_opts
->warn_num_sign_change
= value
;
399 cpp_opts
->warn_multichar
= value
; /* Was C++ only. */
404 cpp_opts
->warn_comments
= value
;
407 case OPT_Wdeprecated
:
408 cpp_opts
->warn_deprecated
= value
;
411 case OPT_Wdiv_by_zero
:
412 warn_div_by_zero
= value
;
415 case OPT_Wendif_labels
:
416 cpp_opts
->warn_endif_labels
= value
;
420 cpp_opts
->warnings_are_errors
= value
;
421 global_dc
->warning_as_error_requested
= value
;
424 case OPT_Werror_implicit_function_declaration
:
425 mesg_implicit_function_declaration
= 2;
433 set_Wformat (atoi (arg
));
437 set_Wimplicit (value
);
441 /* Silently ignore for now. */
444 case OPT_Winvalid_pch
:
445 cpp_opts
->warn_invalid_pch
= value
;
455 case OPT_Wmissing_include_dirs
:
456 cpp_opts
->warn_missing_include_dirs
= value
;
460 cpp_opts
->warn_multichar
= value
;
463 case OPT_Wreturn_type
:
464 warn_return_type
= value
;
467 case OPT_Wsystem_headers
:
468 cpp_opts
->warn_system_headers
= value
;
471 case OPT_Wtraditional
:
472 cpp_opts
->warn_traditional
= value
;
476 cpp_opts
->warn_trigraphs
= value
;
480 cpp_opts
->warn_undef
= value
;
483 case OPT_Wunknown_pragmas
:
484 /* Set to greater than 1, so that even unknown pragmas in
485 system headers will be warned about. */
486 warn_unknown_pragmas
= value
* 2;
489 case OPT_Wunused_macros
:
490 warn_unused_macros
= value
;
493 case OPT_Wvariadic_macros
:
494 warn_variadic_macros
= value
;
497 case OPT_Wwrite_strings
:
498 if (!c_dialect_cxx ())
499 flag_const_strings
= value
;
501 warn_write_strings
= value
;
505 if (!c_dialect_cxx ())
506 set_std_c89 (false, true);
508 set_std_cxx98 (true);
515 case OPT_fcond_mismatch
:
516 if (!c_dialect_cxx ())
518 flag_cond_mismatch
= value
;
523 case OPT_fall_virtual
:
524 case OPT_falt_external_templates
:
525 case OPT_fenum_int_equiv
:
526 case OPT_fexternal_templates
:
527 case OPT_fguiding_decls
:
529 case OPT_fhuge_objects
:
531 case OPT_fname_mangling_version_
:
533 case OPT_fnonnull_objects
:
535 case OPT_fstrict_prototype
:
536 case OPT_fthis_is_variable
:
537 case OPT_fvtable_thunks
:
540 warning ("switch %qs is no longer supported", option
->opt_text
);
543 case OPT_faccess_control
:
544 flag_access_control
= value
;
548 flag_no_asm
= !value
;
552 flag_no_builtin
= !value
;
559 disable_builtin_function (arg
);
562 case OPT_fdollars_in_identifiers
:
563 cpp_opts
->dollars_in_ident
= value
;
566 case OPT_ffreestanding
:
568 /* Fall through.... */
571 flag_no_builtin
= !value
;
572 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
573 if (!value
&& warn_main
== 2)
577 case OPT_fshort_double
:
578 flag_short_double
= value
;
581 case OPT_fshort_enums
:
582 flag_short_enums
= value
;
585 case OPT_fshort_wchar
:
586 flag_short_wchar
= value
;
589 case OPT_fsigned_bitfields
:
590 flag_signed_bitfields
= value
;
593 case OPT_fsigned_char
:
594 flag_signed_char
= value
;
597 case OPT_funsigned_bitfields
:
598 flag_signed_bitfields
= !value
;
601 case OPT_funsigned_char
:
602 flag_signed_char
= !value
;
606 flag_check_new
= value
;
609 case OPT_fconserve_space
:
610 flag_conserve_space
= value
;
613 case OPT_fconst_strings
:
614 flag_const_strings
= value
;
617 case OPT_fconstant_string_class_
:
618 constant_string_class_name
= arg
;
621 case OPT_fdefault_inline
:
622 flag_default_inline
= value
;
625 case OPT_felide_constructors
:
626 flag_elide_constructors
= value
;
629 case OPT_fenforce_eh_specs
:
630 flag_enforce_eh_specs
= value
;
633 case OPT_ffixed_form
:
634 case OPT_ffixed_line_length_
:
635 /* Fortran front end options ignored when preprocessing only. */
636 if (!flag_preprocess_only
)
641 flag_new_for_scope
= value
;
644 case OPT_fgnu_keywords
:
645 flag_no_gnu_keywords
= !value
;
648 case OPT_fgnu_runtime
:
649 flag_next_runtime
= !value
;
652 case OPT_fhandle_exceptions
:
653 warning ("-fhandle-exceptions has been renamed -fexceptions (and is now on by default)");
654 flag_exceptions
= value
;
657 case OPT_fimplement_inlines
:
658 flag_implement_inlines
= value
;
661 case OPT_fimplicit_inline_templates
:
662 flag_implicit_inline_templates
= value
;
665 case OPT_fimplicit_templates
:
666 flag_implicit_templates
= value
;
669 case OPT_fms_extensions
:
670 flag_ms_extensions
= value
;
673 case OPT_fnext_runtime
:
674 flag_next_runtime
= value
;
677 case OPT_fnil_receivers
:
678 flag_nil_receivers
= value
;
681 case OPT_fnonansi_builtins
:
682 flag_no_nonansi_builtin
= !value
;
685 case OPT_fobjc_exceptions
:
686 flag_objc_exceptions
= value
;
689 case OPT_fobjc_sjlj_exceptions
:
690 flag_objc_sjlj_exceptions
= value
;
693 case OPT_foperator_names
:
694 cpp_opts
->operator_names
= value
;
697 case OPT_foptional_diags
:
698 flag_optional_diags
= value
;
702 cpp_opts
->restore_pch_deps
= value
;
705 case OPT_fpch_preprocess
:
706 flag_pch_preprocess
= value
;
709 case OPT_fpermissive
:
710 flag_permissive
= value
;
713 case OPT_fpreprocessed
:
714 cpp_opts
->preprocessed
= value
;
717 case OPT_freplace_objc_classes
:
718 flag_replace_objc_classes
= value
;
722 flag_use_repository
= value
;
724 flag_implicit_templates
= 0;
731 case OPT_fshow_column
:
732 cpp_opts
->show_column
= value
;
736 flag_detailed_statistics
= value
;
740 /* It is documented that we silently ignore silly values. */
741 if (value
>= 1 && value
<= 100)
742 cpp_opts
->tabstop
= value
;
745 case OPT_fexec_charset_
:
746 cpp_opts
->narrow_charset
= arg
;
749 case OPT_fwide_exec_charset_
:
750 cpp_opts
->wide_charset
= arg
;
753 case OPT_finput_charset_
:
754 cpp_opts
->input_charset
= arg
;
757 case OPT_ftemplate_depth_
:
758 max_tinst_depth
= value
;
761 case OPT_fuse_cxa_atexit
:
762 flag_use_cxa_atexit
= value
;
765 case OPT_fvisibility_inlines_hidden
:
766 visibility_options
.inlines_hidden
= value
;
773 case OPT_fthreadsafe_statics
:
774 flag_threadsafe_statics
= value
;
778 flag_zero_link
= value
;
782 flag_gen_declaration
= 1;
786 add_path (xstrdup (arg
), AFTER
, 0, true);
791 defer_opt (code
, arg
);
799 add_path (xstrdup (arg
), QUOTE
, 0, true);
807 add_path (xstrdup (arg
), SYSTEM
, 0, true);
810 case OPT_iwithprefix
:
811 add_prefixed_path (arg
, SYSTEM
);
814 case OPT_iwithprefixbefore
:
815 add_prefixed_path (arg
, BRACKET
);
819 cpp_set_lang (parse_in
, CLK_ASM
);
820 cpp_opts
->dollars_in_ident
= false;
839 error ("output filename specified twice");
842 /* We need to handle the -pedantic switches here, rather than in
843 c_common_post_options, so that a subsequent -Wno-endif-labels
844 is not overridden. */
845 case OPT_pedantic_errors
:
846 cpp_opts
->pedantic_errors
= 1;
849 cpp_opts
->pedantic
= 1;
850 cpp_opts
->warn_endif_labels
= 1;
853 case OPT_print_objc_runtime_info
:
854 print_struct_values
= 1;
862 case OPT_std_gnu__98
:
863 set_std_cxx98 (code
== OPT_std_c__98
/* ISO */);
867 case OPT_std_iso9899_1990
:
868 case OPT_std_iso9899_199409
:
869 set_std_c89 (code
== OPT_std_iso9899_199409
/* c94 */, true /* ISO */);
873 set_std_c89 (false /* c94 */, false /* ISO */);
878 case OPT_std_iso9899_1999
:
879 case OPT_std_iso9899_199x
:
880 set_std_c99 (true /* ISO */);
885 set_std_c99 (false /* ISO */);
889 cpp_opts
->trigraphs
= 1;
892 case OPT_traditional_cpp
:
893 cpp_opts
->traditional
= 1;
901 cpp_opts
->inhibit_warnings
= 1;
912 /* Post-switch processing. */
914 c_common_post_options (const char **pfilename
)
916 struct cpp_callbacks
*cb
;
918 /* Canonicalize the input and output filenames. */
919 if (in_fnames
== NULL
)
921 in_fnames
= XNEWVEC (const char *, 1);
924 else if (strcmp (in_fnames
[0], "-") == 0)
927 if (out_fname
== NULL
|| !strcmp (out_fname
, "-"))
930 if (cpp_opts
->deps
.style
== DEPS_NONE
)
931 check_deps_environment_vars ();
933 handle_deferred_opts ();
935 sanitize_cpp_opts ();
937 register_include_chains (parse_in
, sysroot
, iprefix
,
938 std_inc
, std_cxx_inc
&& c_dialect_cxx (), verbose
);
940 flag_inline_trees
= 1;
942 /* Use tree inlining. */
945 if (flag_inline_functions
)
946 flag_inline_trees
= 2;
948 /* If we are given more than one input file, we must use
949 unit-at-a-time mode. */
950 if (num_in_fnames
> 1)
951 flag_unit_at_a_time
= 1;
953 /* Default to ObjC sjlj exception handling if NeXT runtime. */
954 if (flag_objc_sjlj_exceptions
< 0)
955 flag_objc_sjlj_exceptions
= flag_next_runtime
;
956 if (flag_objc_exceptions
&& !flag_objc_sjlj_exceptions
)
959 /* -Wextra implies -Wsign-compare and -Wmissing-field-initializers,
960 but not if explicitly overridden. */
961 if (warn_sign_compare
== -1)
962 warn_sign_compare
= extra_warnings
;
963 if (warn_missing_field_initializers
== -1)
964 warn_missing_field_initializers
= 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 /* C99 requires special handling of complex multiplication and division;
982 -ffast-math and -fcx-limited-range are handled in process_options. */
984 flag_complex_method
= 2;
986 if (flag_preprocess_only
)
988 /* Open the output now. We must do so even if flag_no_output is
989 on, because there may be other output than from the actual
990 preprocessing (e.g. from -dM). */
991 if (out_fname
[0] == '\0')
994 out_stream
= fopen (out_fname
, "w");
996 if (out_stream
== NULL
)
998 fatal_error ("opening output file %s: %m", out_fname
);
1002 if (num_in_fnames
> 1)
1003 error ("too many filenames given. Type %s --help for usage",
1006 init_pp_output (out_stream
);
1012 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1013 input_location
= UNKNOWN_LOCATION
;
1016 cb
= cpp_get_callbacks (parse_in
);
1017 cb
->file_change
= cb_file_change
;
1018 cb
->dir_change
= cb_dir_change
;
1019 cpp_post_options (parse_in
);
1021 input_location
= UNKNOWN_LOCATION
;
1023 /* If an error has occurred in cpplib, note it so we fail
1025 errorcount
+= cpp_errors (parse_in
);
1027 *pfilename
= this_input_filename
1028 = cpp_read_main_file (parse_in
, in_fnames
[0]);
1029 /* Don't do any compilation or preprocessing if there is no input file. */
1030 if (this_input_filename
== NULL
)
1036 if (flag_working_directory
1037 && flag_preprocess_only
&& !flag_no_line_commands
)
1038 pp_dir_change (parse_in
, get_src_pwd ());
1040 return flag_preprocess_only
;
1043 /* Front end initialization common to C, ObjC and C++. */
1045 c_common_init (void)
1047 /* Set up preprocessor arithmetic. Must be done after call to
1048 c_common_nodes_and_builtins for type nodes to be good. */
1049 cpp_opts
->precision
= TYPE_PRECISION (intmax_type_node
);
1050 cpp_opts
->char_precision
= TYPE_PRECISION (char_type_node
);
1051 cpp_opts
->int_precision
= TYPE_PRECISION (integer_type_node
);
1052 cpp_opts
->wchar_precision
= TYPE_PRECISION (wchar_type_node
);
1053 cpp_opts
->unsigned_wchar
= TYPE_UNSIGNED (wchar_type_node
);
1054 cpp_opts
->bytes_big_endian
= BYTES_BIG_ENDIAN
;
1056 /* This can't happen until after wchar_precision and bytes_big_endian
1058 cpp_init_iconv (parse_in
);
1060 if (flag_preprocess_only
)
1063 preprocess_file (parse_in
);
1067 /* Has to wait until now so that cpplib has its hash table. */
1073 /* Initialize the integrated preprocessor after debug output has been
1074 initialized; loop over each input file. */
1076 c_common_parse_file (int set_yydebug
)
1080 /* Enable parser debugging, if requested and we can. If requested
1081 and we can't, notify the user. */
1083 yydebug
= set_yydebug
;
1086 warning ("YYDEBUG was not defined at build time, -dy ignored");
1092 /* Start the main input file */
1093 (*debug_hooks
->start_source_file
) (0, this_input_filename
);
1100 /* And end the main input file. */
1101 (*debug_hooks
->end_source_file
) (0);
1102 if (++i
>= num_in_fnames
)
1104 cpp_undef_all (parse_in
);
1106 = cpp_read_main_file (parse_in
, in_fnames
[i
]);
1107 /* If an input file is missing, abandon further compilation.
1108 cpplib has issued a diagnostic. */
1109 if (!this_input_filename
)
1114 /* Common finish hook for the C, ObjC and C++ front ends. */
1116 c_common_finish (void)
1118 FILE *deps_stream
= NULL
;
1120 if (cpp_opts
->deps
.style
!= DEPS_NONE
)
1122 /* If -M or -MM was seen without -MF, default output to the
1125 deps_stream
= out_stream
;
1128 deps_stream
= fopen (deps_file
, deps_append
? "a": "w");
1130 fatal_error ("opening dependency file %s: %m", deps_file
);
1134 /* For performance, avoid tearing down cpplib's internal structures
1135 with cpp_destroy (). */
1136 errorcount
+= cpp_finish (parse_in
, deps_stream
);
1138 if (deps_stream
&& deps_stream
!= out_stream
1139 && (ferror (deps_stream
) || fclose (deps_stream
)))
1140 fatal_error ("closing dependency file %s: %m", deps_file
);
1142 if (out_stream
&& (ferror (out_stream
) || fclose (out_stream
)))
1143 fatal_error ("when writing output to %s: %m", out_fname
);
1146 /* Either of two environment variables can specify output of
1147 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1148 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1149 and DEPS_TARGET is the target to mention in the deps. They also
1150 result in dependency information being appended to the output file
1151 rather than overwriting it, and like Sun's compiler
1152 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1154 check_deps_environment_vars (void)
1158 GET_ENVIRONMENT (spec
, "DEPENDENCIES_OUTPUT");
1160 cpp_opts
->deps
.style
= DEPS_USER
;
1163 GET_ENVIRONMENT (spec
, "SUNPRO_DEPENDENCIES");
1166 cpp_opts
->deps
.style
= DEPS_SYSTEM
;
1167 cpp_opts
->deps
.ignore_main_file
= true;
1173 /* Find the space before the DEPS_TARGET, if there is one. */
1174 char *s
= strchr (spec
, ' ');
1177 /* Let the caller perform MAKE quoting. */
1178 defer_opt (OPT_MT
, s
+ 1);
1182 /* Command line -MF overrides environment variables and default. */
1191 /* Handle deferred command line switches. */
1193 handle_deferred_opts (void)
1198 /* Avoid allocating the deps buffer if we don't need it.
1199 (This flag may be true without there having been -MT or -MQ
1200 options, but we'll still need the deps buffer.) */
1204 deps
= cpp_get_deps (parse_in
);
1206 for (i
= 0; i
< deferred_count
; i
++)
1208 struct deferred_opt
*opt
= &deferred_opts
[i
];
1210 if (opt
->code
== OPT_MT
|| opt
->code
== OPT_MQ
)
1211 deps_add_target (deps
, opt
->arg
, opt
->code
== OPT_MQ
);
1215 /* These settings are appropriate for GCC, but not necessarily so for
1216 cpplib as a library. */
1218 sanitize_cpp_opts (void)
1220 /* If we don't know what style of dependencies to output, complain
1221 if any other dependency switches have been given. */
1222 if (deps_seen
&& cpp_opts
->deps
.style
== DEPS_NONE
)
1223 error ("to generate dependencies you must specify either -M or -MM");
1225 /* -dM and dependencies suppress normal output; do it here so that
1226 the last -d[MDN] switch overrides earlier ones. */
1227 if (flag_dump_macros
== 'M')
1230 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1231 -dM since at least glibc relies on -M -dM to work. */
1232 /* Also, flag_no_output implies flag_no_line_commands, always. */
1235 if (flag_dump_macros
!= 'M')
1236 flag_dump_macros
= 0;
1237 flag_dump_includes
= 0;
1238 flag_no_line_commands
= 1;
1241 cpp_opts
->unsigned_char
= !flag_signed_char
;
1242 cpp_opts
->stdc_0_in_system_headers
= STDC_0_IN_SYSTEM_HEADERS
;
1244 /* We want -Wno-long-long to override -pedantic -std=non-c99
1245 and/or -Wtraditional, whatever the ordering. */
1246 cpp_opts
->warn_long_long
1247 = warn_long_long
&& ((!flag_isoc99
&& pedantic
) || warn_traditional
);
1249 /* Similarly with -Wno-variadic-macros. No check for c99 here, since
1250 this also turns off warnings about GCCs extension. */
1251 cpp_opts
->warn_variadic_macros
1252 = warn_variadic_macros
&& (pedantic
|| warn_traditional
);
1254 /* If we're generating preprocessor output, emit current directory
1255 if explicitly requested or if debugging information is enabled.
1256 ??? Maybe we should only do it for debugging formats that
1257 actually output the current directory? */
1258 if (flag_working_directory
== -1)
1259 flag_working_directory
= (debug_info_level
!= DINFO_LEVEL_NONE
);
1262 /* Add include path with a prefix at the front of its name. */
1264 add_prefixed_path (const char *suffix
, size_t chain
)
1268 size_t prefix_len
, suffix_len
;
1270 suffix_len
= strlen (suffix
);
1271 prefix
= iprefix
? iprefix
: cpp_GCC_INCLUDE_DIR
;
1272 prefix_len
= iprefix
? strlen (iprefix
) : cpp_GCC_INCLUDE_DIR_len
;
1274 path
= (char *) xmalloc (prefix_len
+ suffix_len
+ 1);
1275 memcpy (path
, prefix
, prefix_len
);
1276 memcpy (path
+ prefix_len
, suffix
, suffix_len
);
1277 path
[prefix_len
+ suffix_len
] = '\0';
1279 add_path (path
, chain
, 0, false);
1282 /* Handle -D, -U, -A, -imacros, and the first -include. */
1284 finish_options (void)
1286 if (!cpp_opts
->preprocessed
)
1290 cpp_change_file (parse_in
, LC_RENAME
, _("<built-in>"));
1291 cpp_init_builtins (parse_in
, flag_hosted
);
1292 c_cpp_builtins (parse_in
);
1294 /* We're about to send user input to cpplib, so make it warn for
1295 things that we previously (when we sent it internal definitions)
1296 told it to not warn.
1298 C99 permits implementation-defined characters in identifiers.
1299 The documented meaning of -std= is to turn off extensions that
1300 conflict with the specified standard, and since a strictly
1301 conforming program cannot contain a '$', we do not condition
1302 their acceptance on the -std= setting. */
1303 cpp_opts
->warn_dollars
= (cpp_opts
->pedantic
&& !cpp_opts
->c99
);
1305 cpp_change_file (parse_in
, LC_RENAME
, _("<command line>"));
1306 for (i
= 0; i
< deferred_count
; i
++)
1308 struct deferred_opt
*opt
= &deferred_opts
[i
];
1310 if (opt
->code
== OPT_D
)
1311 cpp_define (parse_in
, opt
->arg
);
1312 else if (opt
->code
== OPT_U
)
1313 cpp_undef (parse_in
, opt
->arg
);
1314 else if (opt
->code
== OPT_A
)
1316 if (opt
->arg
[0] == '-')
1317 cpp_unassert (parse_in
, opt
->arg
+ 1);
1319 cpp_assert (parse_in
, opt
->arg
);
1323 /* Handle -imacros after -D and -U. */
1324 for (i
= 0; i
< deferred_count
; i
++)
1326 struct deferred_opt
*opt
= &deferred_opts
[i
];
1328 if (opt
->code
== OPT_imacros
1329 && cpp_push_include (parse_in
, opt
->arg
))
1331 /* Disable push_command_line_include callback for now. */
1332 include_cursor
= deferred_count
+ 1;
1333 cpp_scan_nooutput (parse_in
);
1339 push_command_line_include ();
1342 /* Give CPP the next file given by -include, if any. */
1344 push_command_line_include (void)
1346 while (include_cursor
< deferred_count
)
1348 struct deferred_opt
*opt
= &deferred_opts
[include_cursor
++];
1350 if (!cpp_opts
->preprocessed
&& opt
->code
== OPT_include
1351 && cpp_push_include (parse_in
, opt
->arg
))
1355 if (include_cursor
== deferred_count
)
1358 /* -Wunused-macros should only warn about macros defined hereafter. */
1359 cpp_opts
->warn_unused_macros
= warn_unused_macros
;
1360 /* Restore the line map from <command line>. */
1361 if (!cpp_opts
->preprocessed
)
1362 cpp_change_file (parse_in
, LC_RENAME
, this_input_filename
);
1364 /* Set this here so the client can change the option if it wishes,
1365 and after stacking the main file so we don't trace the main file. */
1366 line_table
.trace_includes
= cpp_opts
->print_include_names
;
1370 /* File change callback. Has to handle -include files. */
1372 cb_file_change (cpp_reader
* ARG_UNUSED (pfile
),
1373 const struct line_map
*new_map
)
1375 if (flag_preprocess_only
)
1376 pp_file_change (new_map
);
1378 fe_file_change (new_map
);
1380 if (new_map
== 0 || (new_map
->reason
== LC_LEAVE
&& MAIN_FILE_P (new_map
)))
1381 push_command_line_include ();
1385 cb_dir_change (cpp_reader
* ARG_UNUSED (pfile
), const char *dir
)
1387 if (!set_src_pwd (dir
))
1388 warning ("too late for # directive to set debug directory");
1391 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1392 extensions if ISO). There is no concept of gnu94. */
1394 set_std_c89 (int c94
, int iso
)
1396 cpp_set_lang (parse_in
, c94
? CLK_STDC94
: iso
? CLK_STDC89
: CLK_GNUC89
);
1399 flag_no_gnu_keywords
= iso
;
1400 flag_no_nonansi_builtin
= iso
;
1405 /* Set the C 99 standard (without GNU extensions if ISO). */
1407 set_std_c99 (int iso
)
1409 cpp_set_lang (parse_in
, iso
? CLK_STDC99
: CLK_GNUC99
);
1411 flag_no_nonansi_builtin
= iso
;
1417 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1419 set_std_cxx98 (int iso
)
1421 cpp_set_lang (parse_in
, iso
? CLK_CXX98
: CLK_GNUCXX
);
1422 flag_no_gnu_keywords
= iso
;
1423 flag_no_nonansi_builtin
= iso
;
1427 /* Handle setting implicit to ON. */
1429 set_Wimplicit (int on
)
1432 warn_implicit_int
= on
;
1435 if (mesg_implicit_function_declaration
!= 2)
1436 mesg_implicit_function_declaration
= 1;
1439 mesg_implicit_function_declaration
= 0;
1442 /* Args to -d specify what to dump. Silently ignore
1443 unrecognized options; they may be aimed at toplev.c. */
1445 handle_OPT_d (const char *arg
)
1449 while ((c
= *arg
++) != '\0')
1452 case 'M': /* Dump macros only. */
1453 case 'N': /* Dump names. */
1454 case 'D': /* Dump definitions. */
1455 flag_dump_macros
= c
;
1459 flag_dump_includes
= 1;