1 /* Command line option handling.
2 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007
3 Free Software Foundation, Inc.
4 Contributed by Neil Booth.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 2, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING. If not, write to the Free
20 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
26 #include "coretypes.h"
32 #include "langhooks.h"
38 #include "diagnostic.h"
39 #include "tm_p.h" /* For OPTIMIZATION_OPTIONS. */
40 #include "insn-attr.h" /* For INSN_SCHEDULING. */
42 #include "tree-pass.h"
44 /* Value of the -G xx switch, and whether it was passed or not. */
45 unsigned HOST_WIDE_INT g_switch_value
;
48 /* True if we should exit after parsing options. */
49 bool exit_after_options
;
51 /* Print various extra warnings. -W/-Wextra. */
54 /* True to warn about any objects definitions whose size is larger
55 than N bytes. Also want about function definitions whose returned
56 values are larger than N bytes, where N is `larger_than_size'. */
57 bool warn_larger_than
;
58 HOST_WIDE_INT larger_than_size
;
60 /* Nonzero means warn about constructs which might not be
61 strict-aliasing safe. */
62 int warn_strict_aliasing
;
64 /* Nonzero means warn about optimizations which rely on undefined
66 int warn_strict_overflow
;
68 /* Hack for cooperation between set_Wunused and set_Wextra. */
69 static bool maybe_warn_unused_parameter
;
71 /* Type(s) of debugging information we are producing (if any). See
72 flags.h for the definitions of the different possible types of
73 debugging information. */
74 enum debug_info_type write_symbols
= NO_DEBUG
;
76 /* Level of debugging information we are producing. See flags.h for
77 the definitions of the different possible levels. */
78 enum debug_info_level debug_info_level
= DINFO_LEVEL_NONE
;
80 /* Nonzero means use GNU-only extensions in the generated symbolic
81 debugging information. Currently, this only has an effect when
82 write_symbols is set to DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
83 bool use_gnu_debug_info_extensions
;
85 /* The default visibility for all symbols (unless overridden) */
86 enum symbol_visibility default_visibility
= VISIBILITY_DEFAULT
;
88 /* Disable unit-at-a-time for frontends that might be still broken in this
91 bool no_unit_at_a_time_default
;
93 /* Global visibility options. */
94 struct visibility_flags visibility_options
;
96 /* What to print when a switch has no documentation. */
97 static const char undocumented_msg
[] = N_("This switch lacks documentation");
99 /* Used for bookkeeping on whether user set these flags so
100 -fprofile-use/-fprofile-generate does not use them. */
101 static bool profile_arc_flag_set
, flag_profile_values_set
;
102 static bool flag_unroll_loops_set
, flag_tracer_set
;
103 static bool flag_value_profile_transformations_set
;
104 static bool flag_peel_loops_set
, flag_branch_probabilities_set
;
106 /* Input file names. */
107 const char **in_fnames
;
108 unsigned num_in_fnames
;
110 static int common_handle_option (size_t scode
, const char *arg
, int value
,
111 unsigned int lang_mask
);
112 static void handle_param (const char *);
113 static void set_Wextra (int);
114 static unsigned int handle_option (const char **argv
, unsigned int lang_mask
);
115 static char *write_langs (unsigned int lang_mask
);
116 static void complain_wrong_lang (const char *, const struct cl_option
*,
117 unsigned int lang_mask
);
118 static void handle_options (unsigned int, const char **, unsigned int);
119 static void set_debug_level (enum debug_info_type type
, int extended
,
122 /* If ARG is a non-negative integer made up solely of digits, return its
123 value, otherwise return -1. */
125 integral_argument (const char *arg
)
129 while (*p
&& ISDIGIT (*p
))
138 /* Return a malloced slash-separated list of languages in MASK. */
140 write_langs (unsigned int mask
)
142 unsigned int n
= 0, len
= 0;
143 const char *lang_name
;
146 for (n
= 0; (lang_name
= lang_names
[n
]) != 0; n
++)
147 if (mask
& (1U << n
))
148 len
+= strlen (lang_name
) + 1;
150 result
= XNEWVEC (char, len
);
152 for (n
= 0; (lang_name
= lang_names
[n
]) != 0; n
++)
153 if (mask
& (1U << n
))
157 strcpy (result
+ len
, lang_name
);
158 len
+= strlen (lang_name
);
166 /* Complain that switch OPT_INDEX does not apply to this front end. */
168 complain_wrong_lang (const char *text
, const struct cl_option
*option
,
169 unsigned int lang_mask
)
171 char *ok_langs
, *bad_lang
;
173 ok_langs
= write_langs (option
->flags
);
174 bad_lang
= write_langs (lang_mask
);
176 /* Eventually this should become a hard error IMO. */
177 warning (0, "command line option \"%s\" is valid for %s but not for %s",
178 text
, ok_langs
, bad_lang
);
184 /* Handle the switch beginning at ARGV for the language indicated by
185 LANG_MASK. Returns the number of switches consumed. */
187 handle_option (const char **argv
, unsigned int lang_mask
)
190 const char *opt
, *arg
= 0;
193 unsigned int result
= 0;
194 const struct cl_option
*option
;
198 opt_index
= find_opt (opt
+ 1, lang_mask
| CL_COMMON
| CL_TARGET
);
199 if (opt_index
== cl_options_count
200 && (opt
[1] == 'W' || opt
[1] == 'f' || opt
[1] == 'm')
201 && opt
[2] == 'n' && opt
[3] == 'o' && opt
[4] == '-')
203 /* Drop the "no-" from negative switches. */
204 size_t len
= strlen (opt
) - 3;
206 dup
= XNEWVEC (char, len
+ 1);
209 memcpy (dup
+ 2, opt
+ 5, len
- 2 + 1);
212 opt_index
= find_opt (opt
+ 1, lang_mask
| CL_COMMON
| CL_TARGET
);
215 if (opt_index
== cl_options_count
)
218 option
= &cl_options
[opt_index
];
220 /* Reject negative form of switches that don't take negatives as
222 if (!value
&& (option
->flags
& CL_REJECT_NEGATIVE
))
225 /* We've recognized this switch. */
228 /* Check to see if the option is disabled for this configuration. */
229 if (option
->flags
& CL_DISABLED
)
231 error ("command line option %qs"
232 " is not supported by this configuration", opt
);
236 /* Sort out any argument the switch takes. */
237 if (option
->flags
& CL_JOINED
)
239 /* Have arg point to the original switch. This is because
240 some code, such as disable_builtin_function, expects its
241 argument to be persistent until the program exits. */
242 arg
= argv
[0] + cl_options
[opt_index
].opt_len
+ 1;
244 arg
+= strlen ("no-");
246 if (*arg
== '\0' && !(option
->flags
& CL_MISSING_OK
))
248 if (option
->flags
& CL_SEPARATE
)
254 /* Missing argument. */
258 else if (option
->flags
& CL_SEPARATE
)
264 /* Now we've swallowed any potential argument, complain if this
265 is a switch for a different front end. */
266 if (!(option
->flags
& (lang_mask
| CL_COMMON
| CL_TARGET
)))
268 complain_wrong_lang (argv
[0], option
, lang_mask
);
271 else if ((option
->flags
& CL_TARGET
)
272 && (option
->flags
& CL_LANG_ALL
)
273 && !(option
->flags
& lang_mask
))
275 /* Complain for target flag language mismatches if any languages
277 complain_wrong_lang (argv
[0], option
, lang_mask
);
281 if (arg
== NULL
&& (option
->flags
& (CL_JOINED
| CL_SEPARATE
)))
283 if (!lang_hooks
.missing_argument (opt
, opt_index
))
284 error ("missing argument to \"%s\"", opt
);
288 /* If the switch takes an integer, convert it. */
289 if (arg
&& (option
->flags
& CL_UINTEGER
))
291 value
= integral_argument (arg
);
294 error ("argument to \"%s\" should be a non-negative integer",
300 if (option
->flag_var
)
301 switch (option
->var_type
)
304 *(int *) option
->flag_var
= value
;
308 *(int *) option
->flag_var
= (value
310 : !option
->var_value
);
315 if ((value
!= 0) == (option
->var_type
== CLVC_BIT_SET
))
316 *(int *) option
->flag_var
|= option
->var_value
;
318 *(int *) option
->flag_var
&= ~option
->var_value
;
319 if (option
->flag_var
== &target_flags
)
320 target_flags_explicit
|= option
->var_value
;
324 *(const char **) option
->flag_var
= arg
;
328 if (option
->flags
& lang_mask
)
329 if (lang_hooks
.handle_option (opt_index
, arg
, value
) == 0)
332 if (result
&& (option
->flags
& CL_COMMON
))
333 if (common_handle_option (opt_index
, arg
, value
, lang_mask
) == 0)
336 if (result
&& (option
->flags
& CL_TARGET
))
337 if (!targetm
.handle_option (opt_index
, arg
, value
))
346 /* Handle FILENAME from the command line. */
348 add_input_filename (const char *filename
)
351 in_fnames
= xrealloc (in_fnames
, num_in_fnames
* sizeof (in_fnames
[0]));
352 in_fnames
[num_in_fnames
- 1] = filename
;
355 /* Decode and handle the vector of command line options. LANG_MASK
356 contains has a single bit set representing the current
359 handle_options (unsigned int argc
, const char **argv
, unsigned int lang_mask
)
363 for (i
= 1; i
< argc
; i
+= n
)
365 const char *opt
= argv
[i
];
367 /* Interpret "-" or a non-switch as a file name. */
368 if (opt
[0] != '-' || opt
[1] == '\0')
370 if (main_input_filename
== NULL
)
371 main_input_filename
= opt
;
372 add_input_filename (opt
);
377 n
= handle_option (argv
+ i
, lang_mask
);
382 error ("unrecognized command line option \"%s\"", opt
);
387 /* Parse command line options and set default flag values. Do minimal
388 options processing. */
390 decode_options (unsigned int argc
, const char **argv
)
392 unsigned int i
, lang_mask
;
394 /* Perform language-specific options initialization. */
395 lang_mask
= lang_hooks
.init_options (argc
, argv
);
397 lang_hooks
.initialize_diagnostics (global_dc
);
399 /* Scan to see what optimization level has been specified. That will
400 determine the default value of many flags. */
401 for (i
= 1; i
< argc
; i
++)
403 if (!strcmp (argv
[i
], "-O"))
408 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'O')
410 /* Handle -Os, -O2, -O3, -O69, ... */
411 const char *p
= &argv
[i
][2];
413 if ((p
[0] == 's') && (p
[1] == 0))
417 /* Optimizing for size forces optimize to be 2. */
422 const int optimize_val
= read_integral_parameter (p
, p
- 2, -1);
423 if (optimize_val
!= -1)
425 optimize
= optimize_val
;
434 flag_merge_constants
= 0;
441 flag_delayed_branch
= 1;
443 #ifdef CAN_DEBUG_WITHOUT_FP
444 flag_omit_frame_pointer
= 1;
446 flag_guess_branch_prob
= 1;
447 flag_cprop_registers
= 1;
448 flag_if_conversion
= 1;
449 flag_if_conversion2
= 1;
450 flag_ipa_pure_const
= 1;
451 flag_ipa_reference
= 1;
452 flag_split_wide_types
= 1;
459 flag_tree_copyrename
= 1;
461 flag_tree_copy_prop
= 1;
463 flag_tree_salias
= 1;
464 if (!no_unit_at_a_time_default
)
465 flag_unit_at_a_time
= 1;
469 /* Loop header copying usually increases size of the code. This used
470 not to be true, since quite often it is possible to verify that
471 the condition is satisfied in the first iteration and therefore
472 to eliminate it. Jump threading handles these cases now. */
479 flag_thread_jumps
= 1;
480 flag_crossjumping
= 1;
481 flag_optimize_sibling_calls
= 1;
482 flag_forward_propagate
= 1;
483 flag_cse_follow_jumps
= 1;
485 flag_expensive_optimizations
= 1;
486 flag_ipa_type_escape
= 1;
487 flag_rerun_cse_after_loop
= 1;
488 flag_caller_saves
= 1;
490 #ifdef INSN_SCHEDULING
491 flag_schedule_insns
= 1;
492 flag_schedule_insns_after_reload
= 1;
495 flag_strict_aliasing
= 1;
496 flag_strict_overflow
= 1;
497 flag_delete_null_pointer_checks
= 1;
498 flag_reorder_blocks
= 1;
499 flag_reorder_functions
= 1;
500 flag_tree_store_ccp
= 1;
501 flag_tree_store_copy_prop
= 1;
506 /* PRE tends to generate bigger code. */
510 /* Allow more virtual operators to increase alias precision. */
511 set_param_value ("max-aliased-vops", 500);
516 flag_inline_functions
= 1;
517 flag_unswitch_loops
= 1;
518 flag_gcse_after_reload
= 1;
520 /* Allow even more virtual operators. */
521 set_param_value ("max-aliased-vops", 1000);
522 set_param_value ("avg-aliased-vops", 3);
525 if (optimize
< 2 || optimize_size
)
532 /* Don't reorder blocks when optimizing for size because extra
533 jump insns may be created; also barrier may create extra padding.
535 More correctly we should have a block reordering mode that tried
536 to minimize the combined size of all the jumps. This would more
537 or less automatically remove extra jumps, but would also try to
538 use more short jumps instead of long jumps. */
539 flag_reorder_blocks
= 0;
540 flag_reorder_blocks_and_partition
= 0;
545 /* Inlining of very small functions usually reduces total size. */
546 set_param_value ("max-inline-insns-single", 5);
547 set_param_value ("max-inline-insns-auto", 5);
548 flag_inline_functions
= 1;
550 /* We want to crossjump as much as possible. */
551 set_param_value ("min-crossjump-insns", 1);
554 /* Initialize whether `char' is signed. */
555 flag_signed_char
= DEFAULT_SIGNED_CHAR
;
556 /* Set this to a special "uninitialized" value. The actual default is set
557 after target options have been processed. */
558 flag_short_enums
= 2;
560 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
562 target_flags
= targetm
.default_target_flags
;
564 /* Some tagets have ABI-specified unwind tables. */
565 flag_unwind_tables
= targetm
.unwind_tables_default
;
567 #ifdef OPTIMIZATION_OPTIONS
568 /* Allow default optimizations to be specified on a per-machine basis. */
569 OPTIMIZATION_OPTIONS (optimize
, optimize_size
);
572 handle_options (argc
, argv
, lang_mask
);
576 if (flag_pic
&& !flag_pie
)
579 if (flag_no_inline
== 2)
582 flag_really_no_inline
= flag_no_inline
;
584 /* Set flag_no_inline before the post_options () hook. The C front
585 ends use it to determine tree inlining defaults. FIXME: such
586 code should be lang-independent when all front ends use tree
587 inlining, in which case it, and this condition, should be moved
588 to the top of process_options() instead. */
591 /* Inlining does not work if not optimizing,
592 so force it not to be done. */
596 /* The c_decode_option function and decode_option hook set
597 this to `2' if -Wall is used, so we can avoid giving out
598 lots of errors for people who don't realize what -Wall does. */
599 if (warn_uninitialized
== 1)
600 warning (OPT_Wuninitialized
,
601 "-Wuninitialized is not supported without -O");
604 if (flag_really_no_inline
== 2)
605 flag_really_no_inline
= flag_no_inline
;
607 /* The optimization to partition hot and cold basic blocks into separate
608 sections of the .o and executable files does not work (currently)
609 with exception handling. This is because there is no support for
610 generating unwind info. If flag_exceptions is turned on we need to
611 turn off the partitioning optimization. */
613 if (flag_exceptions
&& flag_reorder_blocks_and_partition
)
616 ("-freorder-blocks-and-partition does not work with exceptions");
617 flag_reorder_blocks_and_partition
= 0;
618 flag_reorder_blocks
= 1;
621 /* If user requested unwind info, then turn off the partitioning
624 if (flag_unwind_tables
&& ! targetm
.unwind_tables_default
625 && flag_reorder_blocks_and_partition
)
627 inform ("-freorder-blocks-and-partition does not support unwind info");
628 flag_reorder_blocks_and_partition
= 0;
629 flag_reorder_blocks
= 1;
632 /* If the target requested unwind info, then turn off the partitioning
633 optimization with a different message. Likewise, if the target does not
634 support named sections. */
636 if (flag_reorder_blocks_and_partition
637 && (!targetm
.have_named_sections
638 || (flag_unwind_tables
&& targetm
.unwind_tables_default
)))
641 ("-freorder-blocks-and-partition does not work on this architecture");
642 flag_reorder_blocks_and_partition
= 0;
643 flag_reorder_blocks
= 1;
647 #define LEFT_COLUMN 27
649 /* Output ITEM, of length ITEM_WIDTH, in the left column,
650 followed by word-wrapped HELP in a second column. */
652 wrap_help (const char *help
,
654 unsigned int item_width
,
655 unsigned int columns
)
657 unsigned int col_width
= LEFT_COLUMN
;
658 unsigned int remaining
, room
, len
;
660 remaining
= strlen (help
);
664 room
= columns
- 3 - MAX (col_width
, item_width
);
673 for (i
= 0; help
[i
]; i
++)
675 if (i
>= room
&& len
!= remaining
)
679 else if ((help
[i
] == '-' || help
[i
] == '/')
680 && help
[i
+ 1] != ' '
681 && i
> 0 && ISALPHA (help
[i
- 1]))
686 printf( " %-*.*s %.*s\n", col_width
, item_width
, item
, len
, help
);
688 while (help
[len
] == ' ')
696 /* Print help for a specific front-end, etc. */
698 print_filtered_help (unsigned int include_flags
,
699 unsigned int exclude_flags
,
700 unsigned int any_flags
,
701 unsigned int columns
)
705 static char *printed
= NULL
;
707 bool displayed
= false;
709 if (include_flags
== CL_PARAMS
)
711 for (i
= 0; i
< LAST_PARAM
; i
++)
713 const char *param
= compiler_params
[i
].option
;
715 help
= compiler_params
[i
].help
;
716 if (help
== NULL
|| *help
== '\0')
718 if (exclude_flags
& CL_UNDOCUMENTED
)
720 help
= undocumented_msg
;
723 /* Get the translation. */
726 wrap_help (help
, param
, strlen (param
), columns
);
733 printed
= xcalloc (1, cl_options_count
);
735 for (i
= 0; i
< cl_options_count
; i
++)
737 static char new_help
[128];
738 const struct cl_option
*option
= cl_options
+ i
;
743 if (include_flags
== 0
744 || ((option
->flags
& include_flags
) != include_flags
))
746 if ((option
->flags
& any_flags
) == 0)
750 /* Skip unwanted switches. */
751 if ((option
->flags
& exclude_flags
) != 0)
755 /* Skip switches that have already been printed. */
764 if (exclude_flags
& CL_UNDOCUMENTED
)
766 help
= undocumented_msg
;
769 /* Get the translation. */
772 /* Find the gap between the name of the
773 option and its descriptive text. */
774 tab
= strchr (help
, '\t');
783 opt
= option
->opt_text
;
787 /* With the -Q option enabled we change the descriptive text associated
788 with an option to be an indication of its current setting. */
791 if (len
< (LEFT_COLUMN
+ 2))
792 strcpy (new_help
, "\t\t");
794 strcpy (new_help
, "\t");
796 if (option
->flag_var
!= NULL
)
798 if (option
->flags
& CL_JOINED
)
800 if (option
->var_type
== CLVC_STRING
)
802 if (* (const char **) option
->flag_var
!= NULL
)
803 snprintf (new_help
+ strlen (new_help
),
804 sizeof (new_help
) - strlen (new_help
),
805 * (const char **) option
->flag_var
);
808 sprintf (new_help
+ strlen (new_help
),
809 "%#x", * (int *) option
->flag_var
);
812 strcat (new_help
, option_enabled (i
)
813 ? _("[enabled]") : _("[disabled]"));
819 wrap_help (help
, opt
, len
, columns
);
824 printf (_(" No options with the desired characteristics were found\n"));
825 else if (! displayed
)
826 printf (_(" All options with the desired characteristics have already been displayed\n"));
831 /* Display help for a specified type of option.
832 The options must have ALL of the INCLUDE_FLAGS set
833 ANY of the flags in the ANY_FLAGS set
834 and NONE of the EXCLUDE_FLAGS set. */
836 print_specific_help (unsigned int include_flags
,
837 unsigned int exclude_flags
,
838 unsigned int any_flags
)
840 unsigned int all_langs_mask
= (1U << cl_lang_count
) - 1;
841 const char * description
= NULL
;
842 const char * descrip_extra
= "";
845 static unsigned int columns
= 0;
847 /* Sanity check: Make sure that we do not have more
848 languages than we have bits available to enumerate them. */
849 gcc_assert ((1U << cl_lang_count
) < CL_MIN_OPTION_CLASS
);
851 /* If we have not done so already, obtain
852 the desired maximum width of the output. */
857 GET_ENVIRONMENT (p
, "COLUMNS");
860 int value
= atoi (p
);
867 /* Use a reasonable default. */
871 /* Decide upon the title for the options that we are going to display. */
872 for (i
= 0, flag
= 1; flag
<= CL_MAX_OPTION_CLASS
; flag
<<= 1, i
++)
874 switch (flag
& include_flags
)
880 description
= _("The following options are target specific");
883 description
= _("The following options control compiler warning messages");
885 case CL_OPTIMIZATION
:
886 description
= _("The following options control optimizations");
889 description
= _("The following options are language-independent");
892 description
= _("The --param option recognizes the following as parameters");
895 if (i
>= cl_lang_count
)
897 if ((exclude_flags
& ((1U << cl_lang_count
) - 1)) != 0)
899 description
= _("The following options are specific to the language ");
900 descrip_extra
= lang_names
[i
];
903 description
= _("The following options are supported by the language ");
904 descrip_extra
= lang_names
[i
];
909 if (description
== NULL
)
913 if (include_flags
== CL_UNDOCUMENTED
)
914 description
= _("The following options are not documented");
917 internal_error ("unrecognized include_flags 0x%x passed to print_specific_help",
924 if (any_flags
& all_langs_mask
)
925 description
= _("The following options are language-related");
927 description
= _("The following options are language-independent");
931 printf ("%s%s:\n", description
, descrip_extra
);
932 print_filtered_help (include_flags
, exclude_flags
, any_flags
, columns
);
935 /* Handle target- and language-independent options. Return zero to
936 generate an "unknown option" message. Only options that need
937 extra handling need to be listed here; if you simply want
938 VALUE assigned to a variable, it happens automatically. */
941 common_handle_option (size_t scode
, const char *arg
, int value
,
942 unsigned int lang_mask
)
944 enum opt_code code
= (enum opt_code
) scode
;
955 unsigned int all_langs_mask
= (1U << cl_lang_count
) - 1;
956 unsigned int undoc_mask
;
959 undoc_mask
= extra_warnings
? 0 : CL_UNDOCUMENTED
;
960 /* First display any single language specific options. */
961 for (i
= 0; i
< cl_lang_count
; i
++)
963 (1U << i
, (all_langs_mask
& (~ (1U << i
))) | undoc_mask
, 0);
964 /* Next display any multi language specific options. */
965 print_specific_help (0, undoc_mask
, all_langs_mask
);
966 /* Then display any remaining, non-language options. */
967 for (i
= CL_MIN_OPTION_CLASS
; i
<= CL_MAX_OPTION_CLASS
; i
<<= 1)
968 print_specific_help (i
, undoc_mask
, 0);
969 exit_after_options
= true;
973 case OPT_ftarget_help
:
974 case OPT__target_help
:
975 print_specific_help (CL_TARGET
, CL_UNDOCUMENTED
, 0);
976 exit_after_options
= true;
982 const char * a
= arg
;
983 unsigned int include_flags
= 0;
984 /* Note - by default we include undocumented options when listing
985 specific classes. If you only want to see documented options
986 then add ",^undocumented" to the --help= option. e.g.:
988 --help=target,^undocumented */
989 unsigned int exclude_flags
= 0;
991 /* Walk along the argument string, parsing each word in turn.
993 arg = [^]{word}[,{arg}]
994 word = {optimizers|target|warnings|undocumented|
995 params|common|<language>} */
1000 const char * string
;
1005 { "optimizers", CL_OPTIMIZATION
},
1006 { "target", CL_TARGET
},
1007 { "warnings", CL_WARNING
},
1008 { "undocumented", CL_UNDOCUMENTED
},
1009 { "params", CL_PARAMS
},
1010 { "joined", CL_JOINED
},
1011 { "separate", CL_SEPARATE
},
1012 { "common", CL_COMMON
},
1015 unsigned int * pflags
;
1023 pflags
= & exclude_flags
;
1026 pflags
= & include_flags
;
1028 comma
= strchr (a
, ',');
1034 for (i
= 0; specifics
[i
].string
!= NULL
; i
++)
1035 if (strncasecmp (a
, specifics
[i
].string
, len
) == 0)
1037 * pflags
|= specifics
[i
].flag
;
1041 if (specifics
[i
].string
== NULL
)
1043 /* Check to see if the string matches a language name. */
1044 for (i
= 0; i
< cl_lang_count
; i
++)
1045 if (strncasecmp (a
, lang_names
[i
], len
) == 0)
1047 * pflags
|= 1U << i
;
1051 if (i
== cl_lang_count
)
1053 "warning: unrecognized argument to --help= switch: %.*s\n",
1063 print_specific_help (include_flags
, exclude_flags
, 0);
1064 exit_after_options
= true;
1069 print_version (stderr
, "");
1070 exit_after_options
= true;
1074 g_switch_value
= value
;
1075 g_switch_set
= true;
1080 /* Currently handled in a prescan. */
1084 /* For backward compatibility, -W is the same as -Wextra. */
1089 enable_warning_as_error (arg
, value
, lang_mask
);
1096 case OPT_Wlarger_than_
:
1097 larger_than_size
= value
;
1098 warn_larger_than
= value
!= -1;
1101 case OPT_Wstrict_aliasing
:
1102 case OPT_Wstrict_aliasing_
:
1103 warn_strict_aliasing
= value
;
1106 case OPT_Wstrict_overflow
:
1107 warn_strict_overflow
= (value
1108 ? (int) WARN_STRICT_OVERFLOW_CONDITIONAL
1112 case OPT_Wstrict_overflow_
:
1113 warn_strict_overflow
= value
;
1117 set_Wunused (value
);
1122 aux_info_file_name
= arg
;
1123 flag_gen_aux_info
= 1;
1127 aux_base_name
= arg
;
1130 case OPT_auxbase_strip
:
1132 char *tmp
= xstrdup (arg
);
1133 strip_off_ending (tmp
, strlen (tmp
));
1135 aux_base_name
= tmp
;
1140 decode_d_option (arg
);
1144 dump_base_name
= arg
;
1147 case OPT_falign_functions_
:
1148 align_functions
= value
;
1151 case OPT_falign_jumps_
:
1152 align_jumps
= value
;
1155 case OPT_falign_labels_
:
1156 align_labels
= value
;
1159 case OPT_falign_loops_
:
1160 align_loops
= value
;
1163 case OPT_fbranch_probabilities
:
1164 flag_branch_probabilities_set
= true;
1167 case OPT_fcall_used_
:
1168 fix_register (arg
, 0, 1);
1171 case OPT_fcall_saved_
:
1172 fix_register (arg
, 0, 0);
1175 case OPT_fdiagnostics_show_location_
:
1176 if (!strcmp (arg
, "once"))
1177 diagnostic_prefixing_rule (global_dc
) = DIAGNOSTICS_SHOW_PREFIX_ONCE
;
1178 else if (!strcmp (arg
, "every-line"))
1179 diagnostic_prefixing_rule (global_dc
)
1180 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE
;
1185 case OPT_fdiagnostics_show_option
:
1186 global_dc
->show_option_requested
= true;
1190 if (!dump_switch_p (arg
))
1194 case OPT_ffast_math
:
1195 set_fast_math_flags (value
);
1199 fix_register (arg
, 1, 1);
1202 case OPT_finline_limit_
:
1203 case OPT_finline_limit_eq
:
1204 set_param_value ("max-inline-insns-single", value
/ 2);
1205 set_param_value ("max-inline-insns-auto", value
/ 2);
1208 case OPT_fmessage_length_
:
1209 pp_set_line_maximum_length (global_dc
->printer
, value
);
1212 case OPT_fpack_struct_
:
1213 if (value
<= 0 || (value
& (value
- 1)) || value
> 16)
1214 error ("structure alignment must be a small power of two, not %d", value
);
1217 initial_max_fld_align
= value
;
1218 maximum_field_alignment
= value
* BITS_PER_UNIT
;
1222 case OPT_fpeel_loops
:
1223 flag_peel_loops_set
= true;
1226 case OPT_fprofile_arcs
:
1227 profile_arc_flag_set
= true;
1230 case OPT_fprofile_use
:
1231 if (!flag_branch_probabilities_set
)
1232 flag_branch_probabilities
= value
;
1233 if (!flag_profile_values_set
)
1234 flag_profile_values
= value
;
1235 if (!flag_unroll_loops_set
)
1236 flag_unroll_loops
= value
;
1237 if (!flag_peel_loops_set
)
1238 flag_peel_loops
= value
;
1239 if (!flag_tracer_set
)
1240 flag_tracer
= value
;
1241 if (!flag_value_profile_transformations_set
)
1242 flag_value_profile_transformations
= value
;
1245 case OPT_fprofile_generate
:
1246 if (!profile_arc_flag_set
)
1247 profile_arc_flag
= value
;
1248 if (!flag_profile_values_set
)
1249 flag_profile_values
= value
;
1250 if (!flag_value_profile_transformations_set
)
1251 flag_value_profile_transformations
= value
;
1254 case OPT_fprofile_values
:
1255 flag_profile_values_set
= true;
1258 case OPT_fvisibility_
:
1260 if (!strcmp(arg
, "default"))
1261 default_visibility
= VISIBILITY_DEFAULT
;
1262 else if (!strcmp(arg
, "internal"))
1263 default_visibility
= VISIBILITY_INTERNAL
;
1264 else if (!strcmp(arg
, "hidden"))
1265 default_visibility
= VISIBILITY_HIDDEN
;
1266 else if (!strcmp(arg
, "protected"))
1267 default_visibility
= VISIBILITY_PROTECTED
;
1269 error ("unrecognized visibility value \"%s\"", arg
);
1274 flag_value_profile_transformations_set
= true;
1277 case OPT_frandom_seed
:
1278 /* The real switch is -fno-random-seed. */
1281 set_random_seed (NULL
);
1284 case OPT_frandom_seed_
:
1285 set_random_seed (arg
);
1288 case OPT_fsched_verbose_
:
1289 #ifdef INSN_SCHEDULING
1290 fix_sched_param ("verbose", arg
);
1296 case OPT_fsched_stalled_insns_
:
1297 flag_sched_stalled_insns
= value
;
1298 if (flag_sched_stalled_insns
== 0)
1299 flag_sched_stalled_insns
= -1;
1302 case OPT_fsched_stalled_insns_dep_
:
1303 flag_sched_stalled_insns_dep
= value
;
1306 case OPT_fstack_limit
:
1307 /* The real switch is -fno-stack-limit. */
1310 stack_limit_rtx
= NULL_RTX
;
1313 case OPT_fstack_limit_register_
:
1315 int reg
= decode_reg_name (arg
);
1317 error ("unrecognized register name \"%s\"", arg
);
1319 stack_limit_rtx
= gen_rtx_REG (Pmode
, reg
);
1323 case OPT_fstack_limit_symbol_
:
1324 stack_limit_rtx
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (arg
));
1327 case OPT_ftree_vectorizer_verbose_
:
1328 vect_set_verbosity_level (arg
);
1331 case OPT_ftls_model_
:
1332 if (!strcmp (arg
, "global-dynamic"))
1333 flag_tls_default
= TLS_MODEL_GLOBAL_DYNAMIC
;
1334 else if (!strcmp (arg
, "local-dynamic"))
1335 flag_tls_default
= TLS_MODEL_LOCAL_DYNAMIC
;
1336 else if (!strcmp (arg
, "initial-exec"))
1337 flag_tls_default
= TLS_MODEL_INITIAL_EXEC
;
1338 else if (!strcmp (arg
, "local-exec"))
1339 flag_tls_default
= TLS_MODEL_LOCAL_EXEC
;
1341 warning (0, "unknown tls-model \"%s\"", arg
);
1345 flag_tracer_set
= true;
1348 case OPT_funroll_loops
:
1349 flag_unroll_loops_set
= true;
1353 set_debug_level (NO_DEBUG
, DEFAULT_GDB_EXTENSIONS
, arg
);
1357 set_debug_level (SDB_DEBUG
, false, arg
);
1361 set_debug_level (DWARF2_DEBUG
, false, arg
);
1365 set_debug_level (NO_DEBUG
, 2, arg
);
1370 set_debug_level (DBX_DEBUG
, code
== OPT_gstabs_
, arg
);
1374 set_debug_level (VMS_DEBUG
, false, arg
);
1379 set_debug_level (XCOFF_DEBUG
, code
== OPT_gxcoff_
, arg
);
1383 asm_file_name
= arg
;
1386 case OPT_pedantic_errors
:
1387 flag_pedantic_errors
= pedantic
= 1;
1390 case OPT_floop_optimize
:
1391 case OPT_frerun_loop_opt
:
1392 case OPT_fstrength_reduce
:
1393 /* These are no-ops, preserved for backward compatibility. */
1397 /* If the flag was handled in a standard way, assume the lack of
1398 processing here is intentional. */
1399 gcc_assert (cl_options
[scode
].flag_var
);
1406 /* Handle --param NAME=VALUE. */
1408 handle_param (const char *carg
)
1413 arg
= xstrdup (carg
);
1414 equal
= strchr (arg
, '=');
1416 error ("%s: --param arguments should be of the form NAME=VALUE", arg
);
1419 value
= integral_argument (equal
+ 1);
1421 error ("invalid --param value %qs", equal
+ 1);
1425 set_param_value (arg
, value
);
1432 /* Handle -W and -Wextra. */
1434 set_Wextra (int setting
)
1436 extra_warnings
= setting
;
1437 warn_unused_parameter
= (setting
&& maybe_warn_unused_parameter
);
1439 /* We save the value of warn_uninitialized, since if they put
1440 -Wuninitialized on the command line, we need to generate a
1441 warning about not using it without also specifying -O. */
1443 warn_uninitialized
= 0;
1444 else if (warn_uninitialized
!= 1)
1445 warn_uninitialized
= 2;
1448 /* Initialize unused warning flags. */
1450 set_Wunused (int setting
)
1452 warn_unused_function
= setting
;
1453 warn_unused_label
= setting
;
1454 /* Unused function parameter warnings are reported when either
1455 ``-Wextra -Wunused'' or ``-Wunused-parameter'' is specified.
1456 Thus, if -Wextra has already been seen, set warn_unused_parameter;
1457 otherwise set maybe_warn_extra_parameter, which will be picked up
1459 maybe_warn_unused_parameter
= setting
;
1460 warn_unused_parameter
= (setting
&& extra_warnings
);
1461 warn_unused_variable
= setting
;
1462 warn_unused_value
= setting
;
1465 /* The following routines are useful in setting all the flags that
1466 -ffast-math and -fno-fast-math imply. */
1468 set_fast_math_flags (int set
)
1470 flag_trapping_math
= !set
;
1471 flag_unsafe_math_optimizations
= set
;
1472 flag_finite_math_only
= set
;
1473 flag_signed_zeros
= !set
;
1474 flag_errno_math
= !set
;
1477 flag_signaling_nans
= 0;
1478 flag_rounding_math
= 0;
1479 flag_cx_limited_range
= 1;
1483 /* Return true iff flags are set as if -ffast-math. */
1485 fast_math_flags_set_p (void)
1487 return (!flag_trapping_math
1488 && flag_unsafe_math_optimizations
1489 && flag_finite_math_only
1490 && !flag_signed_zeros
1491 && !flag_errno_math
);
1494 /* Handle a debug output -g switch. EXTENDED is true or false to support
1495 extended output (2 is special and means "-ggdb" was given). */
1497 set_debug_level (enum debug_info_type type
, int extended
, const char *arg
)
1499 static bool type_explicit
;
1501 use_gnu_debug_info_extensions
= extended
;
1503 if (type
== NO_DEBUG
)
1505 if (write_symbols
== NO_DEBUG
)
1507 write_symbols
= PREFERRED_DEBUGGING_TYPE
;
1511 #ifdef DWARF2_DEBUGGING_INFO
1512 write_symbols
= DWARF2_DEBUG
;
1513 #elif defined DBX_DEBUGGING_INFO
1514 write_symbols
= DBX_DEBUG
;
1518 if (write_symbols
== NO_DEBUG
)
1519 warning (0, "target system does not support debug output");
1524 /* Does it conflict with an already selected type? */
1525 if (type_explicit
&& write_symbols
!= NO_DEBUG
&& type
!= write_symbols
)
1526 error ("debug format \"%s\" conflicts with prior selection",
1527 debug_type_names
[type
]);
1528 write_symbols
= type
;
1529 type_explicit
= true;
1532 /* A debug flag without a level defaults to level 2. */
1535 if (!debug_info_level
)
1536 debug_info_level
= 2;
1540 debug_info_level
= integral_argument (arg
);
1541 if (debug_info_level
== (unsigned int) -1)
1542 error ("unrecognised debug output level \"%s\"", arg
);
1543 else if (debug_info_level
> 3)
1544 error ("debug output level %s is too high", arg
);
1548 /* Return 1 if OPTION is enabled, 0 if it is disabled, or -1 if it isn't
1549 a simple on-off switch. */
1552 option_enabled (int opt_idx
)
1554 const struct cl_option
*option
= &(cl_options
[opt_idx
]);
1556 if (option
->flag_var
)
1557 switch (option
->var_type
)
1560 return *(int *) option
->flag_var
!= 0;
1563 return *(int *) option
->flag_var
== option
->var_value
;
1565 case CLVC_BIT_CLEAR
:
1566 return (*(int *) option
->flag_var
& option
->var_value
) == 0;
1569 return (*(int *) option
->flag_var
& option
->var_value
) != 0;
1577 /* Fill STATE with the current state of option OPTION. Return true if
1578 there is some state to store. */
1581 get_option_state (int option
, struct cl_option_state
*state
)
1583 if (cl_options
[option
].flag_var
== 0)
1586 switch (cl_options
[option
].var_type
)
1590 state
->data
= cl_options
[option
].flag_var
;
1591 state
->size
= sizeof (int);
1594 case CLVC_BIT_CLEAR
:
1596 state
->ch
= option_enabled (option
);
1597 state
->data
= &state
->ch
;
1602 state
->data
= *(const char **) cl_options
[option
].flag_var
;
1603 if (state
->data
== 0)
1605 state
->size
= strlen (state
->data
) + 1;
1611 /* Enable a warning option as an error. This is used by -Werror= and
1612 also by legacy Werror-implicit-function-declaration. */
1615 enable_warning_as_error (const char *arg
, int value
, unsigned int lang_mask
)
1620 new_option
= XNEWVEC (char, strlen (arg
) + 2);
1621 new_option
[0] = 'W';
1622 strcpy (new_option
+ 1, arg
);
1623 option_index
= find_opt (new_option
, lang_mask
);
1624 if (option_index
== N_OPTS
)
1626 error ("-Werror=%s: No option -%s", arg
, new_option
);
1630 int kind
= value
? DK_ERROR
: DK_WARNING
;
1631 diagnostic_classify_diagnostic (global_dc
, option_index
, kind
);
1633 /* -Werror=foo implies -Wfoo. */
1634 if (cl_options
[option_index
].var_type
== CLVC_BOOLEAN
1635 && cl_options
[option_index
].flag_var
1636 && kind
== DK_ERROR
)
1637 *(int *) cl_options
[option_index
].flag_var
= 1;