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 /* Hack for cooperation between set_Wunused and set_Wextra. */
65 static bool maybe_warn_unused_parameter
;
67 /* Type(s) of debugging information we are producing (if any). See
68 flags.h for the definitions of the different possible types of
69 debugging information. */
70 enum debug_info_type write_symbols
= NO_DEBUG
;
72 /* Level of debugging information we are producing. See flags.h for
73 the definitions of the different possible levels. */
74 enum debug_info_level debug_info_level
= DINFO_LEVEL_NONE
;
76 /* Nonzero means use GNU-only extensions in the generated symbolic
77 debugging information. Currently, this only has an effect when
78 write_symbols is set to DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
79 bool use_gnu_debug_info_extensions
;
81 /* The default visibility for all symbols (unless overridden) */
82 enum symbol_visibility default_visibility
= VISIBILITY_DEFAULT
;
84 /* Disable unit-at-a-time for frontends that might be still broken in this
87 bool no_unit_at_a_time_default
;
89 /* Global visibility options. */
90 struct visibility_flags visibility_options
;
92 /* What to print when a switch has no documentation. */
93 static const char undocumented_msg
[] = N_("This switch lacks documentation");
95 /* Used for bookkeeping on whether user set these flags so
96 -fprofile-use/-fprofile-generate does not use them. */
97 static bool profile_arc_flag_set
, flag_profile_values_set
;
98 static bool flag_unroll_loops_set
, flag_tracer_set
;
99 static bool flag_value_profile_transformations_set
;
100 static bool flag_peel_loops_set
, flag_branch_probabilities_set
;
102 /* Input file names. */
103 const char **in_fnames
;
104 unsigned num_in_fnames
;
106 static int common_handle_option (size_t scode
, const char *arg
, int value
,
107 unsigned int lang_mask
);
108 static void handle_param (const char *);
109 static void set_Wextra (int);
110 static unsigned int handle_option (const char **argv
, unsigned int lang_mask
);
111 static char *write_langs (unsigned int lang_mask
);
112 static void complain_wrong_lang (const char *, const struct cl_option
*,
113 unsigned int lang_mask
);
114 static void handle_options (unsigned int, const char **, unsigned int);
115 static void set_debug_level (enum debug_info_type type
, int extended
,
118 /* If ARG is a non-negative integer made up solely of digits, return its
119 value, otherwise return -1. */
121 integral_argument (const char *arg
)
125 while (*p
&& ISDIGIT (*p
))
134 /* Return a malloced slash-separated list of languages in MASK. */
136 write_langs (unsigned int mask
)
138 unsigned int n
= 0, len
= 0;
139 const char *lang_name
;
142 for (n
= 0; (lang_name
= lang_names
[n
]) != 0; n
++)
143 if (mask
& (1U << n
))
144 len
+= strlen (lang_name
) + 1;
146 result
= XNEWVEC (char, len
);
148 for (n
= 0; (lang_name
= lang_names
[n
]) != 0; n
++)
149 if (mask
& (1U << n
))
153 strcpy (result
+ len
, lang_name
);
154 len
+= strlen (lang_name
);
162 /* Complain that switch OPT_INDEX does not apply to this front end. */
164 complain_wrong_lang (const char *text
, const struct cl_option
*option
,
165 unsigned int lang_mask
)
167 char *ok_langs
, *bad_lang
;
169 ok_langs
= write_langs (option
->flags
);
170 bad_lang
= write_langs (lang_mask
);
172 /* Eventually this should become a hard error IMO. */
173 warning (0, "command line option \"%s\" is valid for %s but not for %s",
174 text
, ok_langs
, bad_lang
);
180 /* Handle the switch beginning at ARGV for the language indicated by
181 LANG_MASK. Returns the number of switches consumed. */
183 handle_option (const char **argv
, unsigned int lang_mask
)
186 const char *opt
, *arg
= 0;
189 unsigned int result
= 0;
190 const struct cl_option
*option
;
194 opt_index
= find_opt (opt
+ 1, lang_mask
| CL_COMMON
| CL_TARGET
);
195 if (opt_index
== cl_options_count
196 && (opt
[1] == 'W' || opt
[1] == 'f' || opt
[1] == 'm')
197 && opt
[2] == 'n' && opt
[3] == 'o' && opt
[4] == '-')
199 /* Drop the "no-" from negative switches. */
200 size_t len
= strlen (opt
) - 3;
202 dup
= XNEWVEC (char, len
+ 1);
205 memcpy (dup
+ 2, opt
+ 5, len
- 2 + 1);
208 opt_index
= find_opt (opt
+ 1, lang_mask
| CL_COMMON
| CL_TARGET
);
211 if (opt_index
== cl_options_count
)
214 option
= &cl_options
[opt_index
];
216 /* Reject negative form of switches that don't take negatives as
218 if (!value
&& (option
->flags
& CL_REJECT_NEGATIVE
))
221 /* We've recognized this switch. */
224 /* Check to see if the option is disabled for this configuration. */
225 if (option
->flags
& CL_DISABLED
)
227 error ("command line option %qs"
228 " is not supported by this configuration", opt
);
232 /* Sort out any argument the switch takes. */
233 if (option
->flags
& CL_JOINED
)
235 /* Have arg point to the original switch. This is because
236 some code, such as disable_builtin_function, expects its
237 argument to be persistent until the program exits. */
238 arg
= argv
[0] + cl_options
[opt_index
].opt_len
+ 1;
240 arg
+= strlen ("no-");
242 if (*arg
== '\0' && !(option
->flags
& CL_MISSING_OK
))
244 if (option
->flags
& CL_SEPARATE
)
250 /* Missing argument. */
254 else if (option
->flags
& CL_SEPARATE
)
260 /* Now we've swallowed any potential argument, complain if this
261 is a switch for a different front end. */
262 if (!(option
->flags
& (lang_mask
| CL_COMMON
| CL_TARGET
)))
264 complain_wrong_lang (argv
[0], option
, lang_mask
);
268 if (arg
== NULL
&& (option
->flags
& (CL_JOINED
| CL_SEPARATE
)))
270 if (!lang_hooks
.missing_argument (opt
, opt_index
))
271 error ("missing argument to \"%s\"", opt
);
275 /* If the switch takes an integer, convert it. */
276 if (arg
&& (option
->flags
& CL_UINTEGER
))
278 value
= integral_argument (arg
);
281 error ("argument to \"%s\" should be a non-negative integer",
287 if (option
->flag_var
)
288 switch (option
->var_type
)
291 *(int *) option
->flag_var
= value
;
295 *(int *) option
->flag_var
= (value
297 : !option
->var_value
);
302 if ((value
!= 0) == (option
->var_type
== CLVC_BIT_SET
))
303 *(int *) option
->flag_var
|= option
->var_value
;
305 *(int *) option
->flag_var
&= ~option
->var_value
;
306 if (option
->flag_var
== &target_flags
)
307 target_flags_explicit
|= option
->var_value
;
311 *(const char **) option
->flag_var
= arg
;
315 if (option
->flags
& lang_mask
)
316 if (lang_hooks
.handle_option (opt_index
, arg
, value
) == 0)
319 if (result
&& (option
->flags
& CL_COMMON
))
320 if (common_handle_option (opt_index
, arg
, value
, lang_mask
) == 0)
323 if (result
&& (option
->flags
& CL_TARGET
))
324 if (!targetm
.handle_option (opt_index
, arg
, value
))
333 /* Handle FILENAME from the command line. */
335 add_input_filename (const char *filename
)
338 in_fnames
= xrealloc (in_fnames
, num_in_fnames
* sizeof (in_fnames
[0]));
339 in_fnames
[num_in_fnames
- 1] = filename
;
342 /* Decode and handle the vector of command line options. LANG_MASK
343 contains has a single bit set representing the current
346 handle_options (unsigned int argc
, const char **argv
, unsigned int lang_mask
)
350 for (i
= 1; i
< argc
; i
+= n
)
352 const char *opt
= argv
[i
];
354 /* Interpret "-" or a non-switch as a file name. */
355 if (opt
[0] != '-' || opt
[1] == '\0')
357 if (main_input_filename
== NULL
)
358 main_input_filename
= opt
;
359 add_input_filename (opt
);
364 n
= handle_option (argv
+ i
, lang_mask
);
369 error ("unrecognized command line option \"%s\"", opt
);
374 /* Parse command line options and set default flag values. Do minimal
375 options processing. */
377 decode_options (unsigned int argc
, const char **argv
)
379 unsigned int i
, lang_mask
;
381 /* Perform language-specific options initialization. */
382 lang_mask
= lang_hooks
.init_options (argc
, argv
);
384 lang_hooks
.initialize_diagnostics (global_dc
);
386 /* Scan to see what optimization level has been specified. That will
387 determine the default value of many flags. */
388 for (i
= 1; i
< argc
; i
++)
390 if (!strcmp (argv
[i
], "-O"))
395 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'O')
397 /* Handle -Os, -O2, -O3, -O69, ... */
398 const char *p
= &argv
[i
][2];
400 if ((p
[0] == 's') && (p
[1] == 0))
404 /* Optimizing for size forces optimize to be 2. */
409 const int optimize_val
= read_integral_parameter (p
, p
- 2, -1);
410 if (optimize_val
!= -1)
412 optimize
= optimize_val
;
421 flag_merge_constants
= 0;
428 flag_delayed_branch
= 1;
430 #ifdef CAN_DEBUG_WITHOUT_FP
431 flag_omit_frame_pointer
= 1;
433 flag_guess_branch_prob
= 1;
434 flag_cprop_registers
= 1;
435 flag_if_conversion
= 1;
436 flag_if_conversion2
= 1;
437 flag_ipa_pure_const
= 1;
438 flag_ipa_reference
= 1;
439 flag_split_wide_types
= 1;
446 flag_tree_copyrename
= 1;
448 flag_tree_copy_prop
= 1;
450 flag_tree_salias
= 1;
451 if (!no_unit_at_a_time_default
)
452 flag_unit_at_a_time
= 1;
456 /* Loop header copying usually increases size of the code. This used
457 not to be true, since quite often it is possible to verify that
458 the condition is satisfied in the first iteration and therefore
459 to eliminate it. Jump threading handles these cases now. */
466 flag_thread_jumps
= 1;
467 flag_crossjumping
= 1;
468 flag_optimize_sibling_calls
= 1;
469 flag_forward_propagate
= 1;
470 flag_cse_follow_jumps
= 1;
472 flag_expensive_optimizations
= 1;
473 flag_ipa_type_escape
= 1;
474 flag_rerun_cse_after_loop
= 1;
475 flag_caller_saves
= 1;
477 #ifdef INSN_SCHEDULING
478 flag_schedule_insns
= 1;
479 flag_schedule_insns_after_reload
= 1;
482 flag_strict_aliasing
= 1;
483 flag_strict_overflow
= 1;
484 flag_delete_null_pointer_checks
= 1;
485 flag_reorder_blocks
= 1;
486 flag_reorder_functions
= 1;
487 flag_tree_store_ccp
= 1;
488 flag_tree_store_copy_prop
= 1;
493 /* PRE tends to generate bigger code. */
500 flag_inline_functions
= 1;
501 flag_unswitch_loops
= 1;
502 flag_gcse_after_reload
= 1;
505 if (optimize
< 2 || optimize_size
)
512 /* Don't reorder blocks when optimizing for size because extra
513 jump insns may be created; also barrier may create extra padding.
515 More correctly we should have a block reordering mode that tried
516 to minimize the combined size of all the jumps. This would more
517 or less automatically remove extra jumps, but would also try to
518 use more short jumps instead of long jumps. */
519 flag_reorder_blocks
= 0;
520 flag_reorder_blocks_and_partition
= 0;
525 /* Inlining of very small functions usually reduces total size. */
526 set_param_value ("max-inline-insns-single", 5);
527 set_param_value ("max-inline-insns-auto", 5);
528 flag_inline_functions
= 1;
530 /* We want to crossjump as much as possible. */
531 set_param_value ("min-crossjump-insns", 1);
534 /* Initialize whether `char' is signed. */
535 flag_signed_char
= DEFAULT_SIGNED_CHAR
;
536 /* Set this to a special "uninitialized" value. The actual default is set
537 after target options have been processed. */
538 flag_short_enums
= 2;
540 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
542 target_flags
= targetm
.default_target_flags
;
544 /* Some tagets have ABI-specified unwind tables. */
545 flag_unwind_tables
= targetm
.unwind_tables_default
;
547 #ifdef OPTIMIZATION_OPTIONS
548 /* Allow default optimizations to be specified on a per-machine basis. */
549 OPTIMIZATION_OPTIONS (optimize
, optimize_size
);
552 handle_options (argc
, argv
, lang_mask
);
556 if (flag_pic
&& !flag_pie
)
559 if (flag_no_inline
== 2)
562 flag_really_no_inline
= flag_no_inline
;
564 /* Set flag_no_inline before the post_options () hook. The C front
565 ends use it to determine tree inlining defaults. FIXME: such
566 code should be lang-independent when all front ends use tree
567 inlining, in which case it, and this condition, should be moved
568 to the top of process_options() instead. */
571 /* Inlining does not work if not optimizing,
572 so force it not to be done. */
576 /* The c_decode_option function and decode_option hook set
577 this to `2' if -Wall is used, so we can avoid giving out
578 lots of errors for people who don't realize what -Wall does. */
579 if (warn_uninitialized
== 1)
580 warning (OPT_Wuninitialized
,
581 "-Wuninitialized is not supported without -O");
584 if (flag_really_no_inline
== 2)
585 flag_really_no_inline
= flag_no_inline
;
587 /* The optimization to partition hot and cold basic blocks into separate
588 sections of the .o and executable files does not work (currently)
589 with exception handling. This is because there is no support for
590 generating unwind info. If flag_exceptions is turned on we need to
591 turn off the partitioning optimization. */
593 if (flag_exceptions
&& flag_reorder_blocks_and_partition
)
596 ("-freorder-blocks-and-partition does not work with exceptions");
597 flag_reorder_blocks_and_partition
= 0;
598 flag_reorder_blocks
= 1;
601 /* If user requested unwind info, then turn off the partitioning
604 if (flag_unwind_tables
&& ! targetm
.unwind_tables_default
605 && flag_reorder_blocks_and_partition
)
607 inform ("-freorder-blocks-and-partition does not support unwind info");
608 flag_reorder_blocks_and_partition
= 0;
609 flag_reorder_blocks
= 1;
612 /* If the target requested unwind info, then turn off the partitioning
613 optimization with a different message. Likewise, if the target does not
614 support named sections. */
616 if (flag_reorder_blocks_and_partition
617 && (!targetm
.have_named_sections
618 || (flag_unwind_tables
&& targetm
.unwind_tables_default
)))
621 ("-freorder-blocks-and-partition does not work on this architecture");
622 flag_reorder_blocks_and_partition
= 0;
623 flag_reorder_blocks
= 1;
627 #define LEFT_COLUMN 27
629 /* Output ITEM, of length ITEM_WIDTH, in the left column,
630 followed by word-wrapped HELP in a second column. */
632 wrap_help (const char *help
,
634 unsigned int item_width
,
635 unsigned int columns
)
637 unsigned int col_width
= LEFT_COLUMN
;
638 unsigned int remaining
, room
, len
;
640 remaining
= strlen (help
);
644 room
= columns
- 3 - MAX (col_width
, item_width
);
653 for (i
= 0; help
[i
]; i
++)
655 if (i
>= room
&& len
!= remaining
)
659 else if ((help
[i
] == '-' || help
[i
] == '/')
660 && help
[i
+ 1] != ' '
661 && i
> 0 && ISALPHA (help
[i
- 1]))
666 printf( " %-*.*s %.*s\n", col_width
, item_width
, item
, len
, help
);
668 while (help
[len
] == ' ')
676 /* Print help for a specific front-end, etc. */
678 print_filtered_help (unsigned int include_flags
,
679 unsigned int exclude_flags
,
680 unsigned int any_flags
,
681 unsigned int columns
)
685 static char *printed
= NULL
;
687 bool displayed
= false;
689 if (include_flags
== CL_PARAMS
)
691 for (i
= 0; i
< LAST_PARAM
; i
++)
693 const char *param
= compiler_params
[i
].option
;
695 help
= compiler_params
[i
].help
;
696 if (help
== NULL
|| *help
== '\0')
698 if (exclude_flags
& CL_UNDOCUMENTED
)
700 help
= undocumented_msg
;
703 /* Get the translation. */
706 wrap_help (help
, param
, strlen (param
), columns
);
713 printed
= xcalloc (1, cl_options_count
);
715 for (i
= 0; i
< cl_options_count
; i
++)
717 static char new_help
[128];
718 const struct cl_option
*option
= cl_options
+ i
;
723 if (include_flags
== 0
724 || ((option
->flags
& include_flags
) != include_flags
))
726 if ((option
->flags
& any_flags
) == 0)
730 /* Skip unwanted switches. */
731 if ((option
->flags
& exclude_flags
) != 0)
735 /* Skip switches that have already been printed. */
744 if (exclude_flags
& CL_UNDOCUMENTED
)
746 help
= undocumented_msg
;
749 /* Get the translation. */
752 /* Find the gap between the name of the
753 option and its descriptive text. */
754 tab
= strchr (help
, '\t');
763 opt
= option
->opt_text
;
767 /* With the -Q option enabled we change the descriptive text associated
768 with an option to be an indication of its current setting. */
771 if (len
< (LEFT_COLUMN
+ 2))
772 strcpy (new_help
, "\t\t");
774 strcpy (new_help
, "\t");
776 if (option
->flag_var
!= NULL
)
778 if (option
->flags
& CL_JOINED
)
780 if (option
->var_type
== CLVC_STRING
)
782 if (* (const char **) option
->flag_var
!= NULL
)
783 snprintf (new_help
+ strlen (new_help
),
784 sizeof (new_help
) - strlen (new_help
),
785 * (const char **) option
->flag_var
);
788 sprintf (new_help
+ strlen (new_help
),
789 "%#x", * (int *) option
->flag_var
);
792 strcat (new_help
, option_enabled (i
)
793 ? _("[enabled]") : _("[disabled]"));
799 wrap_help (help
, opt
, len
, columns
);
804 printf (_(" No options with the desired characteristics were found\n"));
805 else if (! displayed
)
806 printf (_(" All options with the desired characteristics have already been displayed\n"));
811 /* Display help for a specified type of option.
812 The options must have ALL of the INCLUDE_FLAGS set
813 ANY of the flags in the ANY_FLAGS set
814 and NONE of the EXCLUDE_FLAGS set. */
816 print_specific_help (unsigned int include_flags
,
817 unsigned int exclude_flags
,
818 unsigned int any_flags
)
820 unsigned int all_langs_mask
= (1U << cl_lang_count
) - 1;
821 const char * description
= NULL
;
822 const char * descrip_extra
= "";
825 static unsigned int columns
= 0;
827 /* Sanity check: Make sure that we do not have more
828 languages than we have bits available to enumerate them. */
829 gcc_assert ((1U << cl_lang_count
) < CL_MIN_OPTION_CLASS
);
831 /* If we have not done so already, obtain
832 the desired maximum width of the output. */
837 GET_ENVIRONMENT (p
, "COLUMNS");
840 int value
= atoi (p
);
847 /* Use a reasonable default. */
851 /* Decide upon the title for the options that we are going to display. */
852 for (i
= 0, flag
= 1; flag
<= CL_MAX_OPTION_CLASS
; flag
<<= 1, i
++)
854 switch (flag
& include_flags
)
860 description
= _("The following options are target specific");
863 description
= _("The following options control compiler warning messages");
865 case CL_OPTIMIZATION
:
866 description
= _("The following options control optimizations");
869 description
= _("The following options are language-independent");
872 description
= _("The --param option recognizes the following as parameters");
875 if (i
>= cl_lang_count
)
877 if ((exclude_flags
& ((1U << cl_lang_count
) - 1)) != 0)
879 description
= _("The following options are specific to the language ");
880 descrip_extra
= lang_names
[i
];
883 description
= _("The following options are supported by, amoung others, the language ");
888 if (description
== NULL
)
892 if (include_flags
== CL_UNDOCUMENTED
)
893 description
= _("The following options are not documented");
896 internal_error ("unrecognized include_flags 0x%x passed to print_specific_help",
903 if (any_flags
& all_langs_mask
)
904 description
= _("The following options are language-related");
906 description
= _("The following options are language-independent");
910 printf ("%s%s:\n", description
, descrip_extra
);
911 print_filtered_help (include_flags
, exclude_flags
, any_flags
, columns
);
914 /* Handle target- and language-independent options. Return zero to
915 generate an "unknown option" message. Only options that need
916 extra handling need to be listed here; if you simply want
917 VALUE assigned to a variable, it happens automatically. */
920 common_handle_option (size_t scode
, const char *arg
, int value
,
921 unsigned int lang_mask
)
923 enum opt_code code
= (enum opt_code
) scode
;
934 unsigned int all_langs_mask
= (1U << cl_lang_count
) - 1;
935 unsigned int undoc_mask
;
938 undoc_mask
= extra_warnings
? 0 : CL_UNDOCUMENTED
;
939 /* First display any single language specific options. */
940 for (i
= 0; i
< cl_lang_count
; i
++)
942 (1U << i
, (all_langs_mask
& (~ (1U << i
))) | undoc_mask
, 0);
943 /* Next display any multi language specific options. */
944 print_specific_help (0, undoc_mask
, all_langs_mask
);
945 /* Then display any remaining, non-language options. */
946 for (i
= CL_MIN_OPTION_CLASS
; i
<= CL_MAX_OPTION_CLASS
; i
<<= 1)
947 print_specific_help (i
, undoc_mask
, 0);
948 exit_after_options
= true;
952 case OPT_ftarget_help
:
953 case OPT__target_help
:
954 print_specific_help (CL_TARGET
, CL_UNDOCUMENTED
, 0);
955 exit_after_options
= true;
961 const char * a
= arg
;
962 unsigned int include_flags
= 0;
963 /* Note - by default we include undocumented options when listing
964 specific classes. If you only want to see documented options
965 then add ",^undocumented" to the --help= option. e.g.:
967 --help=target,^undocumented */
968 unsigned int exclude_flags
= 0;
970 /* Walk along the argument string, parsing each word in turn.
972 arg = [^]{word}[,{arg}]
973 word = {optimizers|target|warnings|undocumented|params} */
983 { "optimizers", CL_OPTIMIZATION
},
984 { "target", CL_TARGET
},
985 { "warnings", CL_WARNING
},
986 { "undocumented", CL_UNDOCUMENTED
},
987 { "params", CL_PARAMS
},
988 { "joined", CL_JOINED
},
989 { "separate", CL_SEPARATE
},
992 unsigned int * pflags
;
1000 pflags
= & exclude_flags
;
1003 pflags
= & include_flags
;
1005 comma
= strchr (a
, ',');
1011 for (i
= 0; specifics
[i
].string
!= NULL
; i
++)
1012 if (strncasecmp (a
, specifics
[i
].string
, len
) == 0)
1014 * pflags
|= specifics
[i
].flag
;
1018 if (specifics
[i
].string
== NULL
)
1020 /* Check to see if the string matches a language name. */
1021 for (i
= 0; i
< cl_lang_count
; i
++)
1022 if (strncasecmp (a
, lang_names
[i
], len
) == 0)
1024 * pflags
|= 1U << i
;
1028 if (i
== cl_lang_count
)
1030 "warning: unrecognized argument to --help= switch: %.*s\n",
1040 print_specific_help (include_flags
, exclude_flags
, 0);
1041 exit_after_options
= true;
1046 print_version (stderr
, "");
1047 exit_after_options
= true;
1051 g_switch_value
= value
;
1052 g_switch_set
= true;
1057 /* Currently handled in a prescan. */
1061 /* For backward compatibility, -W is the same as -Wextra. */
1070 new_option
= XNEWVEC (char, strlen (arg
) + 2);
1071 new_option
[0] = 'W';
1072 strcpy (new_option
+1, arg
);
1073 option_index
= find_opt (new_option
, lang_mask
);
1074 if (option_index
== N_OPTS
)
1076 error ("-Werror-%s: No option -%s", arg
, new_option
);
1080 int kind
= value
? DK_ERROR
: DK_WARNING
;
1081 diagnostic_classify_diagnostic (global_dc
, option_index
, kind
);
1083 /* -Werror=foo implies -Wfoo. */
1084 if (cl_options
[option_index
].var_type
== CLVC_BOOLEAN
1085 && cl_options
[option_index
].flag_var
1086 && kind
== DK_ERROR
)
1087 *(int *) cl_options
[option_index
].flag_var
= 1;
1097 case OPT_Wlarger_than_
:
1098 larger_than_size
= value
;
1099 warn_larger_than
= value
!= -1;
1102 case OPT_Wstrict_aliasing
:
1103 case OPT_Wstrict_aliasing_
:
1104 warn_strict_aliasing
= value
;
1108 set_Wunused (value
);
1113 aux_info_file_name
= arg
;
1114 flag_gen_aux_info
= 1;
1118 aux_base_name
= arg
;
1121 case OPT_auxbase_strip
:
1123 char *tmp
= xstrdup (arg
);
1124 strip_off_ending (tmp
, strlen (tmp
));
1126 aux_base_name
= tmp
;
1131 decode_d_option (arg
);
1135 dump_base_name
= arg
;
1138 case OPT_falign_functions_
:
1139 align_functions
= value
;
1142 case OPT_falign_jumps_
:
1143 align_jumps
= value
;
1146 case OPT_falign_labels_
:
1147 align_labels
= value
;
1150 case OPT_falign_loops_
:
1151 align_loops
= value
;
1154 case OPT_fbranch_probabilities
:
1155 flag_branch_probabilities_set
= true;
1158 case OPT_fcall_used_
:
1159 fix_register (arg
, 0, 1);
1162 case OPT_fcall_saved_
:
1163 fix_register (arg
, 0, 0);
1166 case OPT_fdiagnostics_show_location_
:
1167 if (!strcmp (arg
, "once"))
1168 diagnostic_prefixing_rule (global_dc
) = DIAGNOSTICS_SHOW_PREFIX_ONCE
;
1169 else if (!strcmp (arg
, "every-line"))
1170 diagnostic_prefixing_rule (global_dc
)
1171 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE
;
1176 case OPT_fdiagnostics_show_option
:
1177 global_dc
->show_option_requested
= true;
1181 if (!dump_switch_p (arg
))
1185 case OPT_ffast_math
:
1186 set_fast_math_flags (value
);
1190 fix_register (arg
, 1, 1);
1193 case OPT_finline_limit_
:
1194 case OPT_finline_limit_eq
:
1195 set_param_value ("max-inline-insns-single", value
/ 2);
1196 set_param_value ("max-inline-insns-auto", value
/ 2);
1199 case OPT_fmessage_length_
:
1200 pp_set_line_maximum_length (global_dc
->printer
, value
);
1203 case OPT_fpack_struct_
:
1204 if (value
<= 0 || (value
& (value
- 1)) || value
> 16)
1205 error ("structure alignment must be a small power of two, not %d", value
);
1208 initial_max_fld_align
= value
;
1209 maximum_field_alignment
= value
* BITS_PER_UNIT
;
1213 case OPT_fpeel_loops
:
1214 flag_peel_loops_set
= true;
1217 case OPT_fprofile_arcs
:
1218 profile_arc_flag_set
= true;
1221 case OPT_fprofile_use
:
1222 if (!flag_branch_probabilities_set
)
1223 flag_branch_probabilities
= value
;
1224 if (!flag_profile_values_set
)
1225 flag_profile_values
= value
;
1226 if (!flag_unroll_loops_set
)
1227 flag_unroll_loops
= value
;
1228 if (!flag_peel_loops_set
)
1229 flag_peel_loops
= value
;
1230 if (!flag_tracer_set
)
1231 flag_tracer
= value
;
1232 if (!flag_value_profile_transformations_set
)
1233 flag_value_profile_transformations
= value
;
1236 case OPT_fprofile_generate
:
1237 if (!profile_arc_flag_set
)
1238 profile_arc_flag
= value
;
1239 if (!flag_profile_values_set
)
1240 flag_profile_values
= value
;
1241 if (!flag_value_profile_transformations_set
)
1242 flag_value_profile_transformations
= value
;
1245 case OPT_fprofile_values
:
1246 flag_profile_values_set
= true;
1249 case OPT_fvisibility_
:
1251 if (!strcmp(arg
, "default"))
1252 default_visibility
= VISIBILITY_DEFAULT
;
1253 else if (!strcmp(arg
, "internal"))
1254 default_visibility
= VISIBILITY_INTERNAL
;
1255 else if (!strcmp(arg
, "hidden"))
1256 default_visibility
= VISIBILITY_HIDDEN
;
1257 else if (!strcmp(arg
, "protected"))
1258 default_visibility
= VISIBILITY_PROTECTED
;
1260 error ("unrecognized visibility value \"%s\"", arg
);
1265 flag_value_profile_transformations_set
= true;
1268 case OPT_frandom_seed
:
1269 /* The real switch is -fno-random-seed. */
1272 flag_random_seed
= NULL
;
1275 case OPT_frandom_seed_
:
1276 flag_random_seed
= arg
;
1279 case OPT_fsched_verbose_
:
1280 #ifdef INSN_SCHEDULING
1281 fix_sched_param ("verbose", arg
);
1287 case OPT_fsched_stalled_insns_
:
1288 flag_sched_stalled_insns
= value
;
1289 if (flag_sched_stalled_insns
== 0)
1290 flag_sched_stalled_insns
= -1;
1293 case OPT_fsched_stalled_insns_dep_
:
1294 flag_sched_stalled_insns_dep
= value
;
1297 case OPT_fstack_limit
:
1298 /* The real switch is -fno-stack-limit. */
1301 stack_limit_rtx
= NULL_RTX
;
1304 case OPT_fstack_limit_register_
:
1306 int reg
= decode_reg_name (arg
);
1308 error ("unrecognized register name \"%s\"", arg
);
1310 stack_limit_rtx
= gen_rtx_REG (Pmode
, reg
);
1314 case OPT_fstack_limit_symbol_
:
1315 stack_limit_rtx
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (arg
));
1318 case OPT_ftree_vectorizer_verbose_
:
1319 vect_set_verbosity_level (arg
);
1322 case OPT_ftls_model_
:
1323 if (!strcmp (arg
, "global-dynamic"))
1324 flag_tls_default
= TLS_MODEL_GLOBAL_DYNAMIC
;
1325 else if (!strcmp (arg
, "local-dynamic"))
1326 flag_tls_default
= TLS_MODEL_LOCAL_DYNAMIC
;
1327 else if (!strcmp (arg
, "initial-exec"))
1328 flag_tls_default
= TLS_MODEL_INITIAL_EXEC
;
1329 else if (!strcmp (arg
, "local-exec"))
1330 flag_tls_default
= TLS_MODEL_LOCAL_EXEC
;
1332 warning (0, "unknown tls-model \"%s\"", arg
);
1336 flag_tracer_set
= true;
1339 case OPT_funroll_loops
:
1340 flag_unroll_loops_set
= true;
1344 set_debug_level (NO_DEBUG
, DEFAULT_GDB_EXTENSIONS
, arg
);
1348 set_debug_level (SDB_DEBUG
, false, arg
);
1352 set_debug_level (DWARF2_DEBUG
, false, arg
);
1356 set_debug_level (NO_DEBUG
, 2, arg
);
1361 set_debug_level (DBX_DEBUG
, code
== OPT_gstabs_
, arg
);
1365 set_debug_level (VMS_DEBUG
, false, arg
);
1370 set_debug_level (XCOFF_DEBUG
, code
== OPT_gxcoff_
, arg
);
1374 asm_file_name
= arg
;
1377 case OPT_pedantic_errors
:
1378 flag_pedantic_errors
= pedantic
= 1;
1381 case OPT_floop_optimize
:
1382 case OPT_frerun_loop_opt
:
1383 case OPT_fstrength_reduce
:
1384 /* These are no-ops, preserved for backward compatibility. */
1388 /* If the flag was handled in a standard way, assume the lack of
1389 processing here is intentional. */
1390 gcc_assert (cl_options
[scode
].flag_var
);
1397 /* Handle --param NAME=VALUE. */
1399 handle_param (const char *carg
)
1404 arg
= xstrdup (carg
);
1405 equal
= strchr (arg
, '=');
1407 error ("%s: --param arguments should be of the form NAME=VALUE", arg
);
1410 value
= integral_argument (equal
+ 1);
1412 error ("invalid --param value %qs", equal
+ 1);
1416 set_param_value (arg
, value
);
1423 /* Handle -W and -Wextra. */
1425 set_Wextra (int setting
)
1427 extra_warnings
= setting
;
1428 warn_unused_parameter
= (setting
&& maybe_warn_unused_parameter
);
1430 /* We save the value of warn_uninitialized, since if they put
1431 -Wuninitialized on the command line, we need to generate a
1432 warning about not using it without also specifying -O. */
1434 warn_uninitialized
= 0;
1435 else if (warn_uninitialized
!= 1)
1436 warn_uninitialized
= 2;
1439 /* Initialize unused warning flags. */
1441 set_Wunused (int setting
)
1443 warn_unused_function
= setting
;
1444 warn_unused_label
= setting
;
1445 /* Unused function parameter warnings are reported when either
1446 ``-Wextra -Wunused'' or ``-Wunused-parameter'' is specified.
1447 Thus, if -Wextra has already been seen, set warn_unused_parameter;
1448 otherwise set maybe_warn_extra_parameter, which will be picked up
1450 maybe_warn_unused_parameter
= setting
;
1451 warn_unused_parameter
= (setting
&& extra_warnings
);
1452 warn_unused_variable
= setting
;
1453 warn_unused_value
= setting
;
1456 /* The following routines are useful in setting all the flags that
1457 -ffast-math and -fno-fast-math imply. */
1459 set_fast_math_flags (int set
)
1461 flag_trapping_math
= !set
;
1462 flag_unsafe_math_optimizations
= set
;
1463 flag_finite_math_only
= set
;
1464 flag_signed_zeros
= !set
;
1465 flag_errno_math
= !set
;
1468 flag_signaling_nans
= 0;
1469 flag_rounding_math
= 0;
1470 flag_cx_limited_range
= 1;
1474 /* Return true iff flags are set as if -ffast-math. */
1476 fast_math_flags_set_p (void)
1478 return (!flag_trapping_math
1479 && flag_unsafe_math_optimizations
1480 && flag_finite_math_only
1481 && !flag_signed_zeros
1482 && !flag_errno_math
);
1485 /* Handle a debug output -g switch. EXTENDED is true or false to support
1486 extended output (2 is special and means "-ggdb" was given). */
1488 set_debug_level (enum debug_info_type type
, int extended
, const char *arg
)
1490 static bool type_explicit
;
1492 use_gnu_debug_info_extensions
= extended
;
1494 if (type
== NO_DEBUG
)
1496 if (write_symbols
== NO_DEBUG
)
1498 write_symbols
= PREFERRED_DEBUGGING_TYPE
;
1502 #ifdef DWARF2_DEBUGGING_INFO
1503 write_symbols
= DWARF2_DEBUG
;
1504 #elif defined DBX_DEBUGGING_INFO
1505 write_symbols
= DBX_DEBUG
;
1509 if (write_symbols
== NO_DEBUG
)
1510 warning (0, "target system does not support debug output");
1515 /* Does it conflict with an already selected type? */
1516 if (type_explicit
&& write_symbols
!= NO_DEBUG
&& type
!= write_symbols
)
1517 error ("debug format \"%s\" conflicts with prior selection",
1518 debug_type_names
[type
]);
1519 write_symbols
= type
;
1520 type_explicit
= true;
1523 /* A debug flag without a level defaults to level 2. */
1526 if (!debug_info_level
)
1527 debug_info_level
= 2;
1531 debug_info_level
= integral_argument (arg
);
1532 if (debug_info_level
== (unsigned int) -1)
1533 error ("unrecognised debug output level \"%s\"", arg
);
1534 else if (debug_info_level
> 3)
1535 error ("debug output level %s is too high", arg
);
1539 /* Return 1 if OPTION is enabled, 0 if it is disabled, or -1 if it isn't
1540 a simple on-off switch. */
1543 option_enabled (int opt_idx
)
1545 const struct cl_option
*option
= &(cl_options
[opt_idx
]);
1547 if (option
->flag_var
)
1548 switch (option
->var_type
)
1551 return *(int *) option
->flag_var
!= 0;
1554 return *(int *) option
->flag_var
== option
->var_value
;
1556 case CLVC_BIT_CLEAR
:
1557 return (*(int *) option
->flag_var
& option
->var_value
) == 0;
1560 return (*(int *) option
->flag_var
& option
->var_value
) != 0;
1568 /* Fill STATE with the current state of option OPTION. Return true if
1569 there is some state to store. */
1572 get_option_state (int option
, struct cl_option_state
*state
)
1574 if (cl_options
[option
].flag_var
== 0)
1577 switch (cl_options
[option
].var_type
)
1581 state
->data
= cl_options
[option
].flag_var
;
1582 state
->size
= sizeof (int);
1585 case CLVC_BIT_CLEAR
:
1587 state
->ch
= option_enabled (option
);
1588 state
->data
= &state
->ch
;
1593 state
->data
= *(const char **) cl_options
[option
].flag_var
;
1594 if (state
->data
== 0)
1596 state
->size
= strlen (state
->data
) + 1;