1 /* Command line option handling.
2 Copyright (C) 2002, 2003, 2004, 2005, 2006 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, 51 Franklin Street, Fifth Floor, Boston, MA
25 #include "coretypes.h"
31 #include "langhooks.h"
37 #include "diagnostic.h"
38 #include "tm_p.h" /* For OPTIMIZATION_OPTIONS. */
39 #include "insn-attr.h" /* For INSN_SCHEDULING. */
41 #include "tree-pass.h"
43 /* Value of the -G xx switch, and whether it was passed or not. */
44 unsigned HOST_WIDE_INT g_switch_value
;
47 /* True if we should exit after parsing options. */
48 bool exit_after_options
;
50 /* Print various extra warnings. -W/-Wextra. */
53 /* True to warn about any objects definitions whose size is larger
54 than N bytes. Also want about function definitions whose returned
55 values are larger than N bytes, where N is `larger_than_size'. */
56 bool warn_larger_than
;
57 HOST_WIDE_INT larger_than_size
;
59 /* Nonzero means warn about constructs which might not be
60 strict-aliasing safe. */
61 int warn_strict_aliasing
;
63 /* Hack for cooperation between set_Wunused and set_Wextra. */
64 static bool maybe_warn_unused_parameter
;
66 /* Type(s) of debugging information we are producing (if any). See
67 flags.h for the definitions of the different possible types of
68 debugging information. */
69 enum debug_info_type write_symbols
= NO_DEBUG
;
71 /* Level of debugging information we are producing. See flags.h for
72 the definitions of the different possible levels. */
73 enum debug_info_level debug_info_level
= DINFO_LEVEL_NONE
;
75 /* Nonzero means use GNU-only extensions in the generated symbolic
76 debugging information. Currently, this only has an effect when
77 write_symbols is set to DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
78 bool use_gnu_debug_info_extensions
;
80 /* The default visibility for all symbols (unless overridden) */
81 enum symbol_visibility default_visibility
= VISIBILITY_DEFAULT
;
83 /* Disable unit-at-a-time for frontends that might be still broken in this
86 bool no_unit_at_a_time_default
;
88 /* Global visibility options. */
89 struct visibility_flags visibility_options
;
91 /* Columns of --help display. */
92 static unsigned int columns
= 80;
94 /* What to print when a switch has no documentation. */
95 static const char undocumented_msg
[] = N_("This switch lacks documentation");
97 /* Used for bookkeeping on whether user set these flags so
98 -fprofile-use/-fprofile-generate does not use them. */
99 static bool profile_arc_flag_set
, flag_profile_values_set
;
100 static bool flag_unroll_loops_set
, flag_tracer_set
;
101 static bool flag_value_profile_transformations_set
;
102 static bool flag_peel_loops_set
, flag_branch_probabilities_set
;
104 /* Input file names. */
105 const char **in_fnames
;
106 unsigned num_in_fnames
;
108 static size_t find_opt (const char *, int);
109 static int common_handle_option (size_t scode
, const char *arg
, int value
,
110 unsigned int lang_mask
);
111 static void handle_param (const char *);
112 static void set_Wextra (int);
113 static unsigned int handle_option (const char **argv
, unsigned int lang_mask
);
114 static char *write_langs (unsigned int lang_mask
);
115 static void complain_wrong_lang (const char *, const struct cl_option
*,
116 unsigned int lang_mask
);
117 static void handle_options (unsigned int, const char **, unsigned int);
118 static void wrap_help (const char *help
, const char *item
, unsigned int);
119 static void print_target_help (void);
120 static void print_help (void);
121 static void print_param_help (void);
122 static void print_filtered_help (unsigned int);
123 static unsigned int print_switch (const char *text
, unsigned int indent
);
124 static void set_debug_level (enum debug_info_type type
, int extended
,
127 /* Perform a binary search to find which option the command-line INPUT
128 matches. Returns its index in the option array, and N_OPTS
129 (cl_options_count) on failure.
131 This routine is quite subtle. A normal binary search is not good
132 enough because some options can be suffixed with an argument, and
133 multiple sub-matches can occur, e.g. input of "-pedantic" matching
134 the initial substring of "-pedantic-errors".
136 A more complicated example is -gstabs. It should match "-g" with
137 an argument of "stabs". Suppose, however, that the number and list
138 of switches are such that the binary search tests "-gen-decls"
139 before having tested "-g". This doesn't match, and as "-gen-decls"
140 is less than "-gstabs", it will become the lower bound of the
141 binary search range, and "-g" will never be seen. To resolve this
142 issue, opts.sh makes "-gen-decls" point, via the back_chain member,
143 to "-g" so that failed searches that end between "-gen-decls" and
144 the lexicographically subsequent switch know to go back and see if
145 "-g" causes a match (which it does in this example).
147 This search is done in such a way that the longest match for the
148 front end in question wins. If there is no match for the current
149 front end, the longest match for a different front end is returned
150 (or N_OPTS if none) and the caller emits an error message. */
152 find_opt (const char *input
, int lang_mask
)
154 size_t mn
, mx
, md
, opt_len
;
155 size_t match_wrong_lang
;
159 mx
= cl_options_count
;
161 /* Find mn such this lexicographical inequality holds:
162 cl_options[mn] <= input < cl_options[mn + 1]. */
166 opt_len
= cl_options
[md
].opt_len
;
167 comp
= strncmp (input
, cl_options
[md
].opt_text
+ 1, opt_len
);
175 /* This is the switch that is the best match but for a different
176 front end, or cl_options_count if there is no match at all. */
177 match_wrong_lang
= cl_options_count
;
179 /* Backtrace the chain of possible matches, returning the longest
180 one, if any, that fits best. With current GCC switches, this
181 loop executes at most twice. */
184 const struct cl_option
*opt
= &cl_options
[mn
];
186 /* Is the input either an exact match or a prefix that takes a
188 if (!strncmp (input
, opt
->opt_text
+ 1, opt
->opt_len
)
189 && (input
[opt
->opt_len
] == '\0' || (opt
->flags
& CL_JOINED
)))
191 /* If language is OK, return it. */
192 if (opt
->flags
& lang_mask
)
195 /* If we haven't remembered a prior match, remember this
196 one. Any prior match is necessarily better. */
197 if (match_wrong_lang
== cl_options_count
)
198 match_wrong_lang
= mn
;
201 /* Try the next possibility. This is cl_options_count if there
203 mn
= opt
->back_chain
;
205 while (mn
!= cl_options_count
);
207 /* Return the best wrong match, or cl_options_count if none. */
208 return match_wrong_lang
;
211 /* If ARG is a non-negative integer made up solely of digits, return its
212 value, otherwise return -1. */
214 integral_argument (const char *arg
)
218 while (*p
&& ISDIGIT (*p
))
227 /* Return a malloced slash-separated list of languages in MASK. */
229 write_langs (unsigned int mask
)
231 unsigned int n
= 0, len
= 0;
232 const char *lang_name
;
235 for (n
= 0; (lang_name
= lang_names
[n
]) != 0; n
++)
236 if (mask
& (1U << n
))
237 len
+= strlen (lang_name
) + 1;
239 result
= XNEWVEC (char, len
);
241 for (n
= 0; (lang_name
= lang_names
[n
]) != 0; n
++)
242 if (mask
& (1U << n
))
246 strcpy (result
+ len
, lang_name
);
247 len
+= strlen (lang_name
);
255 /* Complain that switch OPT_INDEX does not apply to this front end. */
257 complain_wrong_lang (const char *text
, const struct cl_option
*option
,
258 unsigned int lang_mask
)
260 char *ok_langs
, *bad_lang
;
262 ok_langs
= write_langs (option
->flags
);
263 bad_lang
= write_langs (lang_mask
);
265 /* Eventually this should become a hard error IMO. */
266 warning (0, "command line option \"%s\" is valid for %s but not for %s",
267 text
, ok_langs
, bad_lang
);
273 /* Handle the switch beginning at ARGV for the language indicated by
274 LANG_MASK. Returns the number of switches consumed. */
276 handle_option (const char **argv
, unsigned int lang_mask
)
279 const char *opt
, *arg
= 0;
282 unsigned int result
= 0;
283 const struct cl_option
*option
;
287 opt_index
= find_opt (opt
+ 1, lang_mask
| CL_COMMON
| CL_TARGET
);
288 if (opt_index
== cl_options_count
289 && (opt
[1] == 'W' || opt
[1] == 'f' || opt
[1] == 'm')
290 && opt
[2] == 'n' && opt
[3] == 'o' && opt
[4] == '-')
292 /* Drop the "no-" from negative switches. */
293 size_t len
= strlen (opt
) - 3;
295 dup
= XNEWVEC (char, len
+ 1);
298 memcpy (dup
+ 2, opt
+ 5, len
- 2 + 1);
301 opt_index
= find_opt (opt
+ 1, lang_mask
| CL_COMMON
| CL_TARGET
);
304 if (opt_index
== cl_options_count
)
307 option
= &cl_options
[opt_index
];
309 /* Reject negative form of switches that don't take negatives as
311 if (!value
&& (option
->flags
& CL_REJECT_NEGATIVE
))
314 /* We've recognized this switch. */
317 /* Check to see if the option is disabled for this configuration. */
318 if (option
->flags
& CL_DISABLED
)
320 error ("command line option %qs"
321 " is not supported by this configuration", opt
);
325 /* Sort out any argument the switch takes. */
326 if (option
->flags
& CL_JOINED
)
328 /* Have arg point to the original switch. This is because
329 some code, such as disable_builtin_function, expects its
330 argument to be persistent until the program exits. */
331 arg
= argv
[0] + cl_options
[opt_index
].opt_len
+ 1;
333 arg
+= strlen ("no-");
335 if (*arg
== '\0' && !(option
->flags
& CL_MISSING_OK
))
337 if (option
->flags
& CL_SEPARATE
)
343 /* Missing argument. */
347 else if (option
->flags
& CL_SEPARATE
)
353 /* Now we've swallowed any potential argument, complain if this
354 is a switch for a different front end. */
355 if (!(option
->flags
& (lang_mask
| CL_COMMON
| CL_TARGET
)))
357 complain_wrong_lang (argv
[0], option
, lang_mask
);
361 if (arg
== NULL
&& (option
->flags
& (CL_JOINED
| CL_SEPARATE
)))
363 if (!lang_hooks
.missing_argument (opt
, opt_index
))
364 error ("missing argument to \"%s\"", opt
);
368 /* If the switch takes an integer, convert it. */
369 if (arg
&& (option
->flags
& CL_UINTEGER
))
371 value
= integral_argument (arg
);
374 error ("argument to \"%s\" should be a non-negative integer",
380 if (option
->flag_var
)
381 switch (option
->var_type
)
384 *(int *) option
->flag_var
= value
;
388 *(int *) option
->flag_var
= (value
390 : !option
->var_value
);
395 if ((value
!= 0) == (option
->var_type
== CLVC_BIT_SET
))
396 *(int *) option
->flag_var
|= option
->var_value
;
398 *(int *) option
->flag_var
&= ~option
->var_value
;
399 if (option
->flag_var
== &target_flags
)
400 target_flags_explicit
|= option
->var_value
;
404 *(const char **) option
->flag_var
= arg
;
408 if (option
->flags
& lang_mask
)
409 if (lang_hooks
.handle_option (opt_index
, arg
, value
) == 0)
412 if (result
&& (option
->flags
& CL_COMMON
))
413 if (common_handle_option (opt_index
, arg
, value
, lang_mask
) == 0)
416 if (result
&& (option
->flags
& CL_TARGET
))
417 if (!targetm
.handle_option (opt_index
, arg
, value
))
426 /* Handle FILENAME from the command line. */
428 add_input_filename (const char *filename
)
431 in_fnames
= xrealloc (in_fnames
, num_in_fnames
* sizeof (in_fnames
[0]));
432 in_fnames
[num_in_fnames
- 1] = filename
;
435 /* Decode and handle the vector of command line options. LANG_MASK
436 contains has a single bit set representing the current
439 handle_options (unsigned int argc
, const char **argv
, unsigned int lang_mask
)
443 for (i
= 1; i
< argc
; i
+= n
)
445 const char *opt
= argv
[i
];
447 /* Interpret "-" or a non-switch as a file name. */
448 if (opt
[0] != '-' || opt
[1] == '\0')
450 if (main_input_filename
== NULL
)
451 main_input_filename
= opt
;
452 add_input_filename (opt
);
457 n
= handle_option (argv
+ i
, lang_mask
);
462 error ("unrecognized command line option \"%s\"", opt
);
467 /* Parse command line options and set default flag values. Do minimal
468 options processing. */
470 decode_options (unsigned int argc
, const char **argv
)
472 unsigned int i
, lang_mask
;
474 /* Perform language-specific options initialization. */
475 lang_mask
= lang_hooks
.init_options (argc
, argv
);
477 lang_hooks
.initialize_diagnostics (global_dc
);
479 /* Scan to see what optimization level has been specified. That will
480 determine the default value of many flags. */
481 for (i
= 1; i
< argc
; i
++)
483 if (!strcmp (argv
[i
], "-O"))
488 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'O')
490 /* Handle -Os, -O2, -O3, -O69, ... */
491 const char *p
= &argv
[i
][2];
493 if ((p
[0] == 's') && (p
[1] == 0))
497 /* Optimizing for size forces optimize to be 2. */
502 const int optimize_val
= read_integral_parameter (p
, p
- 2, -1);
503 if (optimize_val
!= -1)
505 optimize
= optimize_val
;
514 flag_merge_constants
= 0;
521 flag_delayed_branch
= 1;
523 #ifdef CAN_DEBUG_WITHOUT_FP
524 flag_omit_frame_pointer
= 1;
526 flag_guess_branch_prob
= 1;
527 flag_cprop_registers
= 1;
528 flag_if_conversion
= 1;
529 flag_if_conversion2
= 1;
530 flag_ipa_pure_const
= 1;
531 flag_ipa_reference
= 1;
537 flag_tree_live_range_split
= 1;
539 flag_tree_copyrename
= 1;
541 flag_tree_copy_prop
= 1;
543 flag_tree_salias
= 1;
544 if (!no_unit_at_a_time_default
)
545 flag_unit_at_a_time
= 1;
549 /* Loop header copying usually increases size of the code. This used
550 not to be true, since quite often it is possible to verify that
551 the condition is satisfied in the first iteration and therefore
552 to eliminate it. Jump threading handles these cases now. */
559 flag_thread_jumps
= 1;
560 flag_crossjumping
= 1;
561 flag_optimize_sibling_calls
= 1;
562 flag_cse_follow_jumps
= 1;
563 flag_cse_skip_blocks
= 1;
565 flag_expensive_optimizations
= 1;
566 flag_ipa_type_escape
= 1;
567 flag_rerun_cse_after_loop
= 1;
568 flag_caller_saves
= 1;
570 #ifdef INSN_SCHEDULING
571 flag_schedule_insns
= 1;
572 flag_schedule_insns_after_reload
= 1;
575 flag_strict_aliasing
= 1;
576 flag_delete_null_pointer_checks
= 1;
577 flag_reorder_blocks
= 1;
578 flag_reorder_functions
= 1;
579 flag_tree_store_ccp
= 1;
580 flag_tree_store_copy_prop
= 1;
585 /* PRE tends to generate bigger code. */
592 flag_inline_functions
= 1;
593 flag_unswitch_loops
= 1;
594 flag_gcse_after_reload
= 1;
597 if (optimize
< 2 || optimize_size
)
604 /* Don't reorder blocks when optimizing for size because extra
605 jump insns may be created; also barrier may create extra padding.
607 More correctly we should have a block reordering mode that tried
608 to minimize the combined size of all the jumps. This would more
609 or less automatically remove extra jumps, but would also try to
610 use more short jumps instead of long jumps. */
611 flag_reorder_blocks
= 0;
612 flag_reorder_blocks_and_partition
= 0;
617 /* Inlining of very small functions usually reduces total size. */
618 set_param_value ("max-inline-insns-single", 5);
619 set_param_value ("max-inline-insns-auto", 5);
620 flag_inline_functions
= 1;
622 /* We want to crossjump as much as possible. */
623 set_param_value ("min-crossjump-insns", 1);
626 /* Initialize whether `char' is signed. */
627 flag_signed_char
= DEFAULT_SIGNED_CHAR
;
628 /* Set this to a special "uninitialized" value. The actual default is set
629 after target options have been processed. */
630 flag_short_enums
= 2;
632 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
634 target_flags
= targetm
.default_target_flags
;
636 /* Some tagets have ABI-specified unwind tables. */
637 flag_unwind_tables
= targetm
.unwind_tables_default
;
639 #ifdef OPTIMIZATION_OPTIONS
640 /* Allow default optimizations to be specified on a per-machine basis. */
641 OPTIMIZATION_OPTIONS (optimize
, optimize_size
);
644 handle_options (argc
, argv
, lang_mask
);
648 if (flag_pic
&& !flag_pie
)
651 if (flag_no_inline
== 2)
654 flag_really_no_inline
= flag_no_inline
;
656 /* Set flag_no_inline before the post_options () hook. The C front
657 ends use it to determine tree inlining defaults. FIXME: such
658 code should be lang-independent when all front ends use tree
659 inlining, in which case it, and this condition, should be moved
660 to the top of process_options() instead. */
663 /* Inlining does not work if not optimizing,
664 so force it not to be done. */
668 /* The c_decode_option function and decode_option hook set
669 this to `2' if -Wall is used, so we can avoid giving out
670 lots of errors for people who don't realize what -Wall does. */
671 if (warn_uninitialized
== 1)
672 warning (OPT_Wuninitialized
,
673 "-Wuninitialized is not supported without -O");
676 if (flag_really_no_inline
== 2)
677 flag_really_no_inline
= flag_no_inline
;
679 /* The optimization to partition hot and cold basic blocks into separate
680 sections of the .o and executable files does not work (currently)
681 with exception handling. This is because there is no support for
682 generating unwind info. If flag_exceptions is turned on we need to
683 turn off the partitioning optimization. */
685 if (flag_exceptions
&& flag_reorder_blocks_and_partition
)
688 ("-freorder-blocks-and-partition does not work with exceptions");
689 flag_reorder_blocks_and_partition
= 0;
690 flag_reorder_blocks
= 1;
693 /* If user requested unwind info, then turn off the partitioning
696 if (flag_unwind_tables
&& ! targetm
.unwind_tables_default
697 && flag_reorder_blocks_and_partition
)
699 inform ("-freorder-blocks-and-partition does not support unwind info");
700 flag_reorder_blocks_and_partition
= 0;
701 flag_reorder_blocks
= 1;
704 /* If the target requested unwind info, then turn off the partitioning
705 optimization with a different message. Likewise, if the target does not
706 support named sections. */
708 if (flag_reorder_blocks_and_partition
709 && (!targetm
.have_named_sections
710 || (flag_unwind_tables
&& targetm
.unwind_tables_default
)))
713 ("-freorder-blocks-and-partition does not work on this architecture");
714 flag_reorder_blocks_and_partition
= 0;
715 flag_reorder_blocks
= 1;
719 /* Handle target- and language-independent options. Return zero to
720 generate an "unknown option" message. Only options that need
721 extra handling need to be listed here; if you simply want
722 VALUE assigned to a variable, it happens automatically. */
725 common_handle_option (size_t scode
, const char *arg
, int value
,
726 unsigned int lang_mask
)
728 enum opt_code code
= (enum opt_code
) scode
;
734 exit_after_options
= true;
741 case OPT__target_help
:
742 print_target_help ();
743 exit_after_options
= true;
747 print_version (stderr
, "");
748 exit_after_options
= true;
752 g_switch_value
= value
;
758 /* Currently handled in a prescan. */
762 /* For backward compatibility, -W is the same as -Wextra. */
770 new_option
= XNEWVEC (char, strlen (arg
) + 2);
772 strcpy (new_option
+1, arg
);
773 option_index
= find_opt (new_option
, lang_mask
);
774 if (option_index
== N_OPTS
)
776 error ("-Werror-%s: No option -%s", arg
, new_option
);
780 int kind
= value
? DK_ERROR
: DK_WARNING
;
781 diagnostic_classify_diagnostic (global_dc
, option_index
, kind
);
783 /* -Werror=foo implies -Wfoo. */
784 if (cl_options
[option_index
].var_type
== CLVC_BOOLEAN
785 && cl_options
[option_index
].flag_var
787 *(int *) cl_options
[option_index
].flag_var
= 1;
797 case OPT_Wlarger_than_
:
798 larger_than_size
= value
;
799 warn_larger_than
= value
!= -1;
802 case OPT_Wstrict_aliasing
:
803 case OPT_Wstrict_aliasing_
:
804 warn_strict_aliasing
= value
;
813 aux_info_file_name
= arg
;
814 flag_gen_aux_info
= 1;
821 case OPT_auxbase_strip
:
823 char *tmp
= xstrdup (arg
);
824 strip_off_ending (tmp
, strlen (tmp
));
831 decode_d_option (arg
);
835 dump_base_name
= arg
;
838 case OPT_falign_functions_
:
839 align_functions
= value
;
842 case OPT_falign_jumps_
:
846 case OPT_falign_labels_
:
847 align_labels
= value
;
850 case OPT_falign_loops_
:
854 case OPT_fbranch_probabilities
:
855 flag_branch_probabilities_set
= true;
858 case OPT_fcall_used_
:
859 fix_register (arg
, 0, 1);
862 case OPT_fcall_saved_
:
863 fix_register (arg
, 0, 0);
866 case OPT_fdiagnostics_show_location_
:
867 if (!strcmp (arg
, "once"))
868 diagnostic_prefixing_rule (global_dc
) = DIAGNOSTICS_SHOW_PREFIX_ONCE
;
869 else if (!strcmp (arg
, "every-line"))
870 diagnostic_prefixing_rule (global_dc
)
871 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE
;
876 case OPT_fdiagnostics_show_option
:
877 global_dc
->show_option_requested
= true;
881 if (!dump_switch_p (arg
))
886 set_fast_math_flags (value
);
890 fix_register (arg
, 1, 1);
893 case OPT_finline_limit_
:
894 case OPT_finline_limit_eq
:
895 set_param_value ("max-inline-insns-single", value
/ 2);
896 set_param_value ("max-inline-insns-auto", value
/ 2);
899 case OPT_fmessage_length_
:
900 pp_set_line_maximum_length (global_dc
->printer
, value
);
903 case OPT_fpack_struct_
:
904 if (value
<= 0 || (value
& (value
- 1)) || value
> 16)
905 error("structure alignment must be a small power of two, not %d", value
);
908 initial_max_fld_align
= value
;
909 maximum_field_alignment
= value
* BITS_PER_UNIT
;
913 case OPT_fpeel_loops
:
914 flag_peel_loops_set
= true;
917 case OPT_fprofile_arcs
:
918 profile_arc_flag_set
= true;
921 case OPT_fprofile_use
:
922 if (!flag_branch_probabilities_set
)
923 flag_branch_probabilities
= value
;
924 if (!flag_profile_values_set
)
925 flag_profile_values
= value
;
926 if (!flag_unroll_loops_set
)
927 flag_unroll_loops
= value
;
928 if (!flag_peel_loops_set
)
929 flag_peel_loops
= value
;
930 if (!flag_tracer_set
)
932 if (!flag_value_profile_transformations_set
)
933 flag_value_profile_transformations
= value
;
936 case OPT_fprofile_generate
:
937 if (!profile_arc_flag_set
)
938 profile_arc_flag
= value
;
939 if (!flag_profile_values_set
)
940 flag_profile_values
= value
;
941 if (!flag_value_profile_transformations_set
)
942 flag_value_profile_transformations
= value
;
945 case OPT_fprofile_values
:
946 flag_profile_values_set
= true;
949 case OPT_fvisibility_
:
951 if (!strcmp(arg
, "default"))
952 default_visibility
= VISIBILITY_DEFAULT
;
953 else if (!strcmp(arg
, "internal"))
954 default_visibility
= VISIBILITY_INTERNAL
;
955 else if (!strcmp(arg
, "hidden"))
956 default_visibility
= VISIBILITY_HIDDEN
;
957 else if (!strcmp(arg
, "protected"))
958 default_visibility
= VISIBILITY_PROTECTED
;
960 error ("unrecognized visibility value \"%s\"", arg
);
965 flag_value_profile_transformations_set
= true;
968 case OPT_frandom_seed
:
969 /* The real switch is -fno-random-seed. */
972 flag_random_seed
= NULL
;
975 case OPT_frandom_seed_
:
976 flag_random_seed
= arg
;
979 case OPT_fsched_verbose_
:
980 #ifdef INSN_SCHEDULING
981 fix_sched_param ("verbose", arg
);
987 case OPT_fsched_stalled_insns_
:
988 flag_sched_stalled_insns
= value
;
989 if (flag_sched_stalled_insns
== 0)
990 flag_sched_stalled_insns
= -1;
993 case OPT_fsched_stalled_insns_dep_
:
994 flag_sched_stalled_insns_dep
= value
;
997 case OPT_fstack_limit
:
998 /* The real switch is -fno-stack-limit. */
1001 stack_limit_rtx
= NULL_RTX
;
1004 case OPT_fstack_limit_register_
:
1006 int reg
= decode_reg_name (arg
);
1008 error ("unrecognized register name \"%s\"", arg
);
1010 stack_limit_rtx
= gen_rtx_REG (Pmode
, reg
);
1014 case OPT_fstack_limit_symbol_
:
1015 stack_limit_rtx
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (arg
));
1018 case OPT_ftree_vectorizer_verbose_
:
1019 vect_set_verbosity_level (arg
);
1022 case OPT_ftls_model_
:
1023 if (!strcmp (arg
, "global-dynamic"))
1024 flag_tls_default
= TLS_MODEL_GLOBAL_DYNAMIC
;
1025 else if (!strcmp (arg
, "local-dynamic"))
1026 flag_tls_default
= TLS_MODEL_LOCAL_DYNAMIC
;
1027 else if (!strcmp (arg
, "initial-exec"))
1028 flag_tls_default
= TLS_MODEL_INITIAL_EXEC
;
1029 else if (!strcmp (arg
, "local-exec"))
1030 flag_tls_default
= TLS_MODEL_LOCAL_EXEC
;
1032 warning (0, "unknown tls-model \"%s\"", arg
);
1036 flag_tracer_set
= true;
1039 case OPT_funroll_loops
:
1040 flag_unroll_loops_set
= true;
1044 set_debug_level (NO_DEBUG
, DEFAULT_GDB_EXTENSIONS
, arg
);
1048 set_debug_level (SDB_DEBUG
, false, arg
);
1052 set_debug_level (DWARF2_DEBUG
, false, arg
);
1056 set_debug_level (NO_DEBUG
, 2, arg
);
1061 set_debug_level (DBX_DEBUG
, code
== OPT_gstabs_
, arg
);
1065 set_debug_level (VMS_DEBUG
, false, arg
);
1070 set_debug_level (XCOFF_DEBUG
, code
== OPT_gxcoff_
, arg
);
1074 asm_file_name
= arg
;
1077 case OPT_pedantic_errors
:
1078 flag_pedantic_errors
= pedantic
= 1;
1081 case OPT_fforce_mem
:
1082 warning (0, "-f[no-]force-mem is nop and option will be removed in 4.2");
1085 case OPT_floop_optimize
:
1086 case OPT_frerun_loop_opt
:
1087 case OPT_fstrength_reduce
:
1088 /* These are no-ops, preserved for backward compatibility. */
1092 /* If the flag was handled in a standard way, assume the lack of
1093 processing here is intentional. */
1094 gcc_assert (cl_options
[scode
].flag_var
);
1101 /* Handle --param NAME=VALUE. */
1103 handle_param (const char *carg
)
1108 arg
= xstrdup (carg
);
1109 equal
= strchr (arg
, '=');
1111 error ("%s: --param arguments should be of the form NAME=VALUE", arg
);
1114 value
= integral_argument (equal
+ 1);
1116 error ("invalid --param value %qs", equal
+ 1);
1120 set_param_value (arg
, value
);
1127 /* Handle -W and -Wextra. */
1129 set_Wextra (int setting
)
1131 extra_warnings
= setting
;
1132 warn_unused_value
= setting
;
1133 warn_unused_parameter
= (setting
&& maybe_warn_unused_parameter
);
1135 /* We save the value of warn_uninitialized, since if they put
1136 -Wuninitialized on the command line, we need to generate a
1137 warning about not using it without also specifying -O. */
1139 warn_uninitialized
= 0;
1140 else if (warn_uninitialized
!= 1)
1141 warn_uninitialized
= 2;
1144 /* Initialize unused warning flags. */
1146 set_Wunused (int setting
)
1148 warn_unused_function
= setting
;
1149 warn_unused_label
= setting
;
1150 /* Unused function parameter warnings are reported when either
1151 ``-Wextra -Wunused'' or ``-Wunused-parameter'' is specified.
1152 Thus, if -Wextra has already been seen, set warn_unused_parameter;
1153 otherwise set maybe_warn_extra_parameter, which will be picked up
1155 maybe_warn_unused_parameter
= setting
;
1156 warn_unused_parameter
= (setting
&& extra_warnings
);
1157 warn_unused_variable
= setting
;
1158 warn_unused_value
= setting
;
1161 /* The following routines are useful in setting all the flags that
1162 -ffast-math and -fno-fast-math imply. */
1164 set_fast_math_flags (int set
)
1166 flag_trapping_math
= !set
;
1167 flag_unsafe_math_optimizations
= set
;
1168 flag_finite_math_only
= set
;
1169 flag_errno_math
= !set
;
1172 flag_signaling_nans
= 0;
1173 flag_rounding_math
= 0;
1174 flag_cx_limited_range
= 1;
1178 /* Return true iff flags are set as if -ffast-math. */
1180 fast_math_flags_set_p (void)
1182 return (!flag_trapping_math
1183 && flag_unsafe_math_optimizations
1184 && flag_finite_math_only
1185 && !flag_errno_math
);
1188 /* Handle a debug output -g switch. EXTENDED is true or false to support
1189 extended output (2 is special and means "-ggdb" was given). */
1191 set_debug_level (enum debug_info_type type
, int extended
, const char *arg
)
1193 static bool type_explicit
;
1195 use_gnu_debug_info_extensions
= extended
;
1197 if (type
== NO_DEBUG
)
1199 if (write_symbols
== NO_DEBUG
)
1201 write_symbols
= PREFERRED_DEBUGGING_TYPE
;
1205 #ifdef DWARF2_DEBUGGING_INFO
1206 write_symbols
= DWARF2_DEBUG
;
1207 #elif defined DBX_DEBUGGING_INFO
1208 write_symbols
= DBX_DEBUG
;
1212 if (write_symbols
== NO_DEBUG
)
1213 warning (0, "target system does not support debug output");
1218 /* Does it conflict with an already selected type? */
1219 if (type_explicit
&& write_symbols
!= NO_DEBUG
&& type
!= write_symbols
)
1220 error ("debug format \"%s\" conflicts with prior selection",
1221 debug_type_names
[type
]);
1222 write_symbols
= type
;
1223 type_explicit
= true;
1226 /* A debug flag without a level defaults to level 2. */
1229 if (!debug_info_level
)
1230 debug_info_level
= 2;
1234 debug_info_level
= integral_argument (arg
);
1235 if (debug_info_level
== (unsigned int) -1)
1236 error ("unrecognised debug output level \"%s\"", arg
);
1237 else if (debug_info_level
> 3)
1238 error ("debug output level %s is too high", arg
);
1242 /* Display help for target options. */
1244 print_target_help (void)
1247 static bool displayed
= false;
1249 /* Avoid double printing for --help --target-help. */
1254 for (i
= 0; i
< cl_options_count
; i
++)
1255 if ((cl_options
[i
].flags
& (CL_TARGET
| CL_UNDOCUMENTED
)) == CL_TARGET
)
1257 printf (_("\nTarget specific options:\n"));
1258 print_filtered_help (CL_TARGET
);
1263 /* Output --help text. */
1270 GET_ENVIRONMENT (p
, "COLUMNS");
1273 int value
= atoi (p
);
1278 puts (_("The following options are language-independent:\n"));
1280 print_filtered_help (CL_COMMON
);
1281 print_param_help ();
1283 for (i
= 0; lang_names
[i
]; i
++)
1285 printf (_("The %s front end recognizes the following options:\n\n"),
1287 print_filtered_help (1U << i
);
1289 print_target_help ();
1292 /* Print the help for --param. */
1294 print_param_help (void)
1298 puts (_("The --param option recognizes the following as parameters:\n"));
1300 for (i
= 0; i
< LAST_PARAM
; i
++)
1302 const char *help
= compiler_params
[i
].help
;
1303 const char *param
= compiler_params
[i
].option
;
1305 if (help
== NULL
|| *help
== '\0')
1306 help
= undocumented_msg
;
1308 /* Get the translation. */
1311 wrap_help (help
, param
, strlen (param
));
1317 /* Print help for a specific front-end, etc. */
1319 print_filtered_help (unsigned int flag
)
1321 unsigned int i
, len
, filter
, indent
= 0;
1322 bool duplicates
= false;
1323 const char *help
, *opt
, *tab
;
1324 static char *printed
;
1326 if (flag
== CL_COMMON
|| flag
== CL_TARGET
)
1330 printed
= xmalloc (cl_options_count
);
1331 memset (printed
, 0, cl_options_count
);
1335 /* Don't print COMMON options twice. */
1336 filter
= flag
| CL_COMMON
;
1338 for (i
= 0; i
< cl_options_count
; i
++)
1340 if ((cl_options
[i
].flags
& filter
) != flag
)
1343 /* Skip help for internal switches. */
1344 if (cl_options
[i
].flags
& CL_UNDOCUMENTED
)
1347 /* Skip switches that have already been printed, mark them to be
1352 indent
= print_switch (cl_options
[i
].opt_text
, indent
);
1363 for (i
= 0; i
< cl_options_count
; i
++)
1365 if ((cl_options
[i
].flags
& filter
) != flag
)
1368 /* Skip help for internal switches. */
1369 if (cl_options
[i
].flags
& CL_UNDOCUMENTED
)
1372 /* Skip switches that have already been printed. */
1378 help
= cl_options
[i
].help
;
1380 help
= undocumented_msg
;
1382 /* Get the translation. */
1385 tab
= strchr (help
, '\t');
1394 opt
= cl_options
[i
].opt_text
;
1398 wrap_help (help
, opt
, len
);
1404 /* Output ITEM, of length ITEM_WIDTH, in the left column, followed by
1405 word-wrapped HELP in a second column. */
1407 print_switch (const char *text
, unsigned int indent
)
1409 unsigned int len
= strlen (text
) + 1; /* trailing comma */
1414 if (indent
+ len
> columns
)
1425 fputs (text
, stdout
);
1427 return indent
+ len
+ 1;
1430 /* Output ITEM, of length ITEM_WIDTH, in the left column, followed by
1431 word-wrapped HELP in a second column. */
1433 wrap_help (const char *help
, const char *item
, unsigned int item_width
)
1435 unsigned int col_width
= 27;
1436 unsigned int remaining
, room
, len
;
1438 remaining
= strlen (help
);
1442 room
= columns
- 3 - MAX (col_width
, item_width
);
1451 for (i
= 0; help
[i
]; i
++)
1453 if (i
>= room
&& len
!= remaining
)
1457 else if ((help
[i
] == '-' || help
[i
] == '/')
1458 && help
[i
+ 1] != ' '
1459 && i
> 0 && ISALPHA (help
[i
- 1]))
1464 printf( " %-*.*s %.*s\n", col_width
, item_width
, item
, len
, help
);
1466 while (help
[len
] == ' ')
1474 /* Return 1 if OPTION is enabled, 0 if it is disabled, or -1 if it isn't
1475 a simple on-off switch. */
1478 option_enabled (int opt_idx
)
1480 const struct cl_option
*option
= &(cl_options
[opt_idx
]);
1481 if (option
->flag_var
)
1482 switch (option
->var_type
)
1485 return *(int *) option
->flag_var
!= 0;
1488 return *(int *) option
->flag_var
== option
->var_value
;
1490 case CLVC_BIT_CLEAR
:
1491 return (*(int *) option
->flag_var
& option
->var_value
) == 0;
1494 return (*(int *) option
->flag_var
& option
->var_value
) != 0;
1502 /* Fill STATE with the current state of option OPTION. Return true if
1503 there is some state to store. */
1506 get_option_state (int option
, struct cl_option_state
*state
)
1508 if (cl_options
[option
].flag_var
== 0)
1511 switch (cl_options
[option
].var_type
)
1515 state
->data
= cl_options
[option
].flag_var
;
1516 state
->size
= sizeof (int);
1519 case CLVC_BIT_CLEAR
:
1521 state
->ch
= option_enabled (option
);
1522 state
->data
= &state
->ch
;
1527 state
->data
= *(const char **) cl_options
[option
].flag_var
;
1528 if (state
->data
== 0)
1530 state
->size
= strlen (state
->data
) + 1;