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 /* Global visibility options. */
84 struct visibility_flags visibility_options
;
86 /* Columns of --help display. */
87 static unsigned int columns
= 80;
89 /* What to print when a switch has no documentation. */
90 static const char undocumented_msg
[] = N_("This switch lacks documentation");
92 /* Used for bookkeeping on whether user set these flags so
93 -fprofile-use/-fprofile-generate does not use them. */
94 static bool profile_arc_flag_set
, flag_profile_values_set
;
95 static bool flag_unroll_loops_set
, flag_tracer_set
;
96 static bool flag_value_profile_transformations_set
;
97 static bool flag_peel_loops_set
, flag_branch_probabilities_set
;
98 static bool flag_loop_optimize_set
;
100 /* Input file names. */
101 const char **in_fnames
;
102 unsigned num_in_fnames
;
104 static size_t find_opt (const char *, int);
105 static int common_handle_option (size_t scode
, const char *arg
, int value
,
106 unsigned int lang_mask
);
107 static void handle_param (const char *);
108 static void set_Wextra (int);
109 static unsigned int handle_option (const char **argv
, unsigned int lang_mask
);
110 static char *write_langs (unsigned int lang_mask
);
111 static void complain_wrong_lang (const char *, const struct cl_option
*,
112 unsigned int lang_mask
);
113 static void handle_options (unsigned int, const char **, unsigned int);
114 static void wrap_help (const char *help
, const char *item
, unsigned int);
115 static void print_target_help (void);
116 static void print_help (void);
117 static void print_param_help (void);
118 static void print_filtered_help (unsigned int);
119 static unsigned int print_switch (const char *text
, unsigned int indent
);
120 static void set_debug_level (enum debug_info_type type
, int extended
,
123 /* Perform a binary search to find which option the command-line INPUT
124 matches. Returns its index in the option array, and N_OPTS
125 (cl_options_count) on failure.
127 This routine is quite subtle. A normal binary search is not good
128 enough because some options can be suffixed with an argument, and
129 multiple sub-matches can occur, e.g. input of "-pedantic" matching
130 the initial substring of "-pedantic-errors".
132 A more complicated example is -gstabs. It should match "-g" with
133 an argument of "stabs". Suppose, however, that the number and list
134 of switches are such that the binary search tests "-gen-decls"
135 before having tested "-g". This doesn't match, and as "-gen-decls"
136 is less than "-gstabs", it will become the lower bound of the
137 binary search range, and "-g" will never be seen. To resolve this
138 issue, opts.sh makes "-gen-decls" point, via the back_chain member,
139 to "-g" so that failed searches that end between "-gen-decls" and
140 the lexicographically subsequent switch know to go back and see if
141 "-g" causes a match (which it does in this example).
143 This search is done in such a way that the longest match for the
144 front end in question wins. If there is no match for the current
145 front end, the longest match for a different front end is returned
146 (or N_OPTS if none) and the caller emits an error message. */
148 find_opt (const char *input
, int lang_mask
)
150 size_t mn
, mx
, md
, opt_len
;
151 size_t match_wrong_lang
;
155 mx
= cl_options_count
;
157 /* Find mn such this lexicographical inequality holds:
158 cl_options[mn] <= input < cl_options[mn + 1]. */
162 opt_len
= cl_options
[md
].opt_len
;
163 comp
= strncmp (input
, cl_options
[md
].opt_text
+ 1, opt_len
);
171 /* This is the switch that is the best match but for a different
172 front end, or cl_options_count if there is no match at all. */
173 match_wrong_lang
= cl_options_count
;
175 /* Backtrace the chain of possible matches, returning the longest
176 one, if any, that fits best. With current GCC switches, this
177 loop executes at most twice. */
180 const struct cl_option
*opt
= &cl_options
[mn
];
182 /* Is the input either an exact match or a prefix that takes a
184 if (!strncmp (input
, opt
->opt_text
+ 1, opt
->opt_len
)
185 && (input
[opt
->opt_len
] == '\0' || (opt
->flags
& CL_JOINED
)))
187 /* If language is OK, return it. */
188 if (opt
->flags
& lang_mask
)
191 /* If we haven't remembered a prior match, remember this
192 one. Any prior match is necessarily better. */
193 if (match_wrong_lang
== cl_options_count
)
194 match_wrong_lang
= mn
;
197 /* Try the next possibility. This is cl_options_count if there
199 mn
= opt
->back_chain
;
201 while (mn
!= cl_options_count
);
203 /* Return the best wrong match, or cl_options_count if none. */
204 return match_wrong_lang
;
207 /* If ARG is a non-negative integer made up solely of digits, return its
208 value, otherwise return -1. */
210 integral_argument (const char *arg
)
214 while (*p
&& ISDIGIT (*p
))
223 /* Return a malloced slash-separated list of languages in MASK. */
225 write_langs (unsigned int mask
)
227 unsigned int n
= 0, len
= 0;
228 const char *lang_name
;
231 for (n
= 0; (lang_name
= lang_names
[n
]) != 0; n
++)
232 if (mask
& (1U << n
))
233 len
+= strlen (lang_name
) + 1;
235 result
= xmalloc (len
);
237 for (n
= 0; (lang_name
= lang_names
[n
]) != 0; n
++)
238 if (mask
& (1U << n
))
242 strcpy (result
+ len
, lang_name
);
243 len
+= strlen (lang_name
);
251 /* Complain that switch OPT_INDEX does not apply to this front end. */
253 complain_wrong_lang (const char *text
, const struct cl_option
*option
,
254 unsigned int lang_mask
)
256 char *ok_langs
, *bad_lang
;
258 ok_langs
= write_langs (option
->flags
);
259 bad_lang
= write_langs (lang_mask
);
261 /* Eventually this should become a hard error IMO. */
262 warning (0, "command line option \"%s\" is valid for %s but not for %s",
263 text
, ok_langs
, bad_lang
);
269 /* Handle the switch beginning at ARGV for the language indicated by
270 LANG_MASK. Returns the number of switches consumed. */
272 handle_option (const char **argv
, unsigned int lang_mask
)
275 const char *opt
, *arg
= 0;
278 unsigned int result
= 0;
279 const struct cl_option
*option
;
283 opt_index
= find_opt (opt
+ 1, lang_mask
| CL_COMMON
| CL_TARGET
);
284 if (opt_index
== cl_options_count
285 && (opt
[1] == 'W' || opt
[1] == 'f' || opt
[1] == 'm')
286 && opt
[2] == 'n' && opt
[3] == 'o' && opt
[4] == '-')
288 /* Drop the "no-" from negative switches. */
289 size_t len
= strlen (opt
) - 3;
291 dup
= xmalloc (len
+ 1);
294 memcpy (dup
+ 2, opt
+ 5, len
- 2 + 1);
297 opt_index
= find_opt (opt
+ 1, lang_mask
| CL_COMMON
| CL_TARGET
);
300 if (opt_index
== cl_options_count
)
303 option
= &cl_options
[opt_index
];
305 /* Reject negative form of switches that don't take negatives as
307 if (!value
&& (option
->flags
& CL_REJECT_NEGATIVE
))
310 /* We've recognized this switch. */
313 /* Check to see if the option is disabled for this configuration. */
314 if (option
->flags
& CL_DISABLED
)
316 error ("command line option %qs"
317 " is not supported by this configuration", opt
);
321 /* Sort out any argument the switch takes. */
322 if (option
->flags
& CL_JOINED
)
324 /* Have arg point to the original switch. This is because
325 some code, such as disable_builtin_function, expects its
326 argument to be persistent until the program exits. */
327 arg
= argv
[0] + cl_options
[opt_index
].opt_len
+ 1;
329 arg
+= strlen ("no-");
331 if (*arg
== '\0' && !(option
->flags
& CL_MISSING_OK
))
333 if (option
->flags
& CL_SEPARATE
)
339 /* Missing argument. */
343 else if (option
->flags
& CL_SEPARATE
)
349 /* Now we've swallowed any potential argument, complain if this
350 is a switch for a different front end. */
351 if (!(option
->flags
& (lang_mask
| CL_COMMON
| CL_TARGET
)))
353 complain_wrong_lang (argv
[0], option
, lang_mask
);
357 if (arg
== NULL
&& (option
->flags
& (CL_JOINED
| CL_SEPARATE
)))
359 if (!lang_hooks
.missing_argument (opt
, opt_index
))
360 error ("missing argument to \"%s\"", opt
);
364 /* If the switch takes an integer, convert it. */
365 if (arg
&& (option
->flags
& CL_UINTEGER
))
367 value
= integral_argument (arg
);
370 error ("argument to \"%s\" should be a non-negative integer",
376 if (option
->flag_var
)
377 switch (option
->var_type
)
380 *(int *) option
->flag_var
= value
;
384 *(int *) option
->flag_var
= (value
386 : !option
->var_value
);
391 if ((value
!= 0) == (option
->var_type
== CLVC_BIT_SET
))
392 *(int *) option
->flag_var
|= option
->var_value
;
394 *(int *) option
->flag_var
&= ~option
->var_value
;
395 if (option
->flag_var
== &target_flags
)
396 target_flags_explicit
|= option
->var_value
;
400 *(const char **) option
->flag_var
= arg
;
404 if (option
->flags
& lang_mask
)
405 if (lang_hooks
.handle_option (opt_index
, arg
, value
) == 0)
408 if (result
&& (option
->flags
& CL_COMMON
))
409 if (common_handle_option (opt_index
, arg
, value
, lang_mask
) == 0)
412 if (result
&& (option
->flags
& CL_TARGET
))
413 if (!targetm
.handle_option (opt_index
, arg
, value
))
422 /* Handle FILENAME from the command line. */
424 add_input_filename (const char *filename
)
427 in_fnames
= xrealloc (in_fnames
, num_in_fnames
* sizeof (in_fnames
[0]));
428 in_fnames
[num_in_fnames
- 1] = filename
;
431 /* Decode and handle the vector of command line options. LANG_MASK
432 contains has a single bit set representing the current
435 handle_options (unsigned int argc
, const char **argv
, unsigned int lang_mask
)
439 for (i
= 1; i
< argc
; i
+= n
)
441 const char *opt
= argv
[i
];
443 /* Interpret "-" or a non-switch as a file name. */
444 if (opt
[0] != '-' || opt
[1] == '\0')
446 if (main_input_filename
== NULL
)
447 main_input_filename
= opt
;
448 add_input_filename (opt
);
453 n
= handle_option (argv
+ i
, lang_mask
);
458 error ("unrecognized command line option \"%s\"", opt
);
463 /* Parse command line options and set default flag values. Do minimal
464 options processing. */
466 decode_options (unsigned int argc
, const char **argv
)
468 unsigned int i
, lang_mask
;
470 /* Perform language-specific options initialization. */
471 lang_mask
= lang_hooks
.init_options (argc
, argv
);
473 lang_hooks
.initialize_diagnostics (global_dc
);
475 /* Scan to see what optimization level has been specified. That will
476 determine the default value of many flags. */
477 for (i
= 1; i
< argc
; i
++)
479 if (!strcmp (argv
[i
], "-O"))
484 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'O')
486 /* Handle -Os, -O2, -O3, -O69, ... */
487 const char *p
= &argv
[i
][2];
489 if ((p
[0] == 's') && (p
[1] == 0))
493 /* Optimizing for size forces optimize to be 2. */
498 const int optimize_val
= read_integral_parameter (p
, p
- 2, -1);
499 if (optimize_val
!= -1)
501 optimize
= optimize_val
;
510 flag_merge_constants
= 0;
517 flag_delayed_branch
= 1;
519 #ifdef CAN_DEBUG_WITHOUT_FP
520 flag_omit_frame_pointer
= 1;
522 flag_guess_branch_prob
= 1;
523 flag_cprop_registers
= 1;
524 flag_loop_optimize
= 1;
525 flag_if_conversion
= 1;
526 flag_if_conversion2
= 1;
527 flag_ipa_pure_const
= 1;
528 flag_ipa_reference
= 1;
534 flag_tree_live_range_split
= 1;
536 flag_tree_copyrename
= 1;
538 flag_tree_copy_prop
= 1;
540 flag_tree_salias
= 1;
541 flag_unit_at_a_time
= 1;
545 /* Loop header copying usually increases size of the code. This used
546 not to be true, since quite often it is possible to verify that
547 the condition is satisfied in the first iteration and therefore
548 to eliminate it. Jump threading handles these cases now. */
555 flag_thread_jumps
= 1;
556 flag_crossjumping
= 1;
557 flag_optimize_sibling_calls
= 1;
558 flag_cse_follow_jumps
= 1;
559 flag_cse_skip_blocks
= 1;
561 flag_expensive_optimizations
= 1;
562 flag_ipa_type_escape
= 1;
563 flag_strength_reduce
= 1;
564 flag_rerun_cse_after_loop
= 1;
565 flag_rerun_loop_opt
= 1;
566 flag_caller_saves
= 1;
568 #ifdef INSN_SCHEDULING
569 flag_schedule_insns
= 1;
570 flag_schedule_insns_after_reload
= 1;
573 flag_strict_aliasing
= 1;
574 flag_delete_null_pointer_checks
= 1;
575 flag_reorder_blocks
= 1;
576 flag_reorder_functions
= 1;
577 flag_tree_store_ccp
= 1;
578 flag_tree_store_copy_prop
= 1;
583 /* PRE tends to generate bigger code. */
590 flag_inline_functions
= 1;
591 flag_unswitch_loops
= 1;
592 flag_gcse_after_reload
= 1;
595 if (optimize
< 2 || optimize_size
)
602 /* Don't reorder blocks when optimizing for size because extra
603 jump insns may be created; also barrier may create extra padding.
605 More correctly we should have a block reordering mode that tried
606 to minimize the combined size of all the jumps. This would more
607 or less automatically remove extra jumps, but would also try to
608 use more short jumps instead of long jumps. */
609 flag_reorder_blocks
= 0;
610 flag_reorder_blocks_and_partition
= 0;
615 /* Inlining of very small functions usually reduces total size. */
616 set_param_value ("max-inline-insns-single", 5);
617 set_param_value ("max-inline-insns-auto", 5);
618 flag_inline_functions
= 1;
620 /* We want to crossjump as much as possible. */
621 set_param_value ("min-crossjump-insns", 1);
624 /* Initialize whether `char' is signed. */
625 flag_signed_char
= DEFAULT_SIGNED_CHAR
;
626 /* Set this to a special "uninitialized" value. The actual default is set
627 after target options have been processed. */
628 flag_short_enums
= 2;
630 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
632 target_flags
= targetm
.default_target_flags
;
634 /* Some tagets have ABI-specified unwind tables. */
635 flag_unwind_tables
= targetm
.unwind_tables_default
;
637 #ifdef OPTIMIZATION_OPTIONS
638 /* Allow default optimizations to be specified on a per-machine basis. */
639 OPTIMIZATION_OPTIONS (optimize
, optimize_size
);
642 handle_options (argc
, argv
, lang_mask
);
646 if (flag_pic
&& !flag_pie
)
649 if (flag_no_inline
== 2)
652 flag_really_no_inline
= flag_no_inline
;
654 /* Set flag_no_inline before the post_options () hook. The C front
655 ends use it to determine tree inlining defaults. FIXME: such
656 code should be lang-independent when all front ends use tree
657 inlining, in which case it, and this condition, should be moved
658 to the top of process_options() instead. */
661 /* Inlining does not work if not optimizing,
662 so force it not to be done. */
666 /* The c_decode_option function and decode_option hook set
667 this to `2' if -Wall is used, so we can avoid giving out
668 lots of errors for people who don't realize what -Wall does. */
669 if (warn_uninitialized
== 1)
670 warning (OPT_Wuninitialized
,
671 "-Wuninitialized is not supported without -O");
674 if (flag_really_no_inline
== 2)
675 flag_really_no_inline
= flag_no_inline
;
677 /* The optimization to partition hot and cold basic blocks into separate
678 sections of the .o and executable files does not work (currently)
679 with exception handling. This is because there is no support for
680 generating unwind info. If flag_exceptions is turned on we need to
681 turn off the partitioning optimization. */
683 if (flag_exceptions
&& flag_reorder_blocks_and_partition
)
686 ("-freorder-blocks-and-partition does not work with exceptions");
687 flag_reorder_blocks_and_partition
= 0;
688 flag_reorder_blocks
= 1;
691 /* If user requested unwind info, then turn off the partitioning
694 if (flag_unwind_tables
&& ! targetm
.unwind_tables_default
695 && flag_reorder_blocks_and_partition
)
697 inform ("-freorder-blocks-and-partition does not support unwind info");
698 flag_reorder_blocks_and_partition
= 0;
699 flag_reorder_blocks
= 1;
702 /* If the target requested unwind info, then turn off the partitioning
703 optimization with a different message. Likewise, if the target does not
704 support named sections. */
706 if (flag_reorder_blocks_and_partition
707 && (!targetm
.have_named_sections
708 || (flag_unwind_tables
&& targetm
.unwind_tables_default
)))
711 ("-freorder-blocks-and-partition does not work on this architecture");
712 flag_reorder_blocks_and_partition
= 0;
713 flag_reorder_blocks
= 1;
717 /* Handle target- and language-independent options. Return zero to
718 generate an "unknown option" message. Only options that need
719 extra handling need to be listed here; if you simply want
720 VALUE assigned to a variable, it happens automatically. */
723 common_handle_option (size_t scode
, const char *arg
, int value
,
724 unsigned int lang_mask
)
726 enum opt_code code
= (enum opt_code
) scode
;
732 exit_after_options
= true;
739 case OPT__target_help
:
740 print_target_help ();
741 exit_after_options
= true;
745 print_version (stderr
, "");
746 exit_after_options
= true;
750 g_switch_value
= value
;
756 /* Currently handled in a prescan. */
760 /* For backward compatibility, -W is the same as -Wextra. */
768 new_option
= (char *) xmalloc (strlen (arg
) + 2);
770 strcpy (new_option
+1, arg
);
771 option_index
= find_opt (new_option
, lang_mask
);
772 if (option_index
== N_OPTS
)
774 error("-Werror-%s: No option -%s", arg
, new_option
);
778 int kind
= value
? DK_ERROR
: DK_WARNING
;
779 diagnostic_classify_diagnostic (global_dc
, option_index
, kind
);
781 /* -Werror=foo implies -Wfoo. */
782 if (cl_options
[option_index
].var_type
== CLVC_BOOLEAN
783 && cl_options
[option_index
].flag_var
785 *(int *) cl_options
[option_index
].flag_var
= 1;
794 case OPT_Wlarger_than_
:
795 larger_than_size
= value
;
796 warn_larger_than
= value
!= -1;
799 case OPT_Wstrict_aliasing
:
800 case OPT_Wstrict_aliasing_
:
801 warn_strict_aliasing
= value
;
810 aux_info_file_name
= arg
;
811 flag_gen_aux_info
= 1;
818 case OPT_auxbase_strip
:
820 char *tmp
= xstrdup (arg
);
821 strip_off_ending (tmp
, strlen (tmp
));
828 decode_d_option (arg
);
832 dump_base_name
= arg
;
835 case OPT_falign_functions_
:
836 align_functions
= value
;
839 case OPT_falign_jumps_
:
843 case OPT_falign_labels_
:
844 align_labels
= value
;
847 case OPT_falign_loops_
:
851 case OPT_fbranch_probabilities
:
852 flag_branch_probabilities_set
= true;
855 case OPT_floop_optimize
:
856 flag_loop_optimize_set
= true;
859 case OPT_fcall_used_
:
860 fix_register (arg
, 0, 1);
863 case OPT_fcall_saved_
:
864 fix_register (arg
, 0, 0);
867 case OPT_fdiagnostics_show_location_
:
868 if (!strcmp (arg
, "once"))
869 diagnostic_prefixing_rule (global_dc
) = DIAGNOSTICS_SHOW_PREFIX_ONCE
;
870 else if (!strcmp (arg
, "every-line"))
871 diagnostic_prefixing_rule (global_dc
)
872 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE
;
877 case OPT_fdiagnostics_show_option
:
878 global_dc
->show_option_requested
= true;
882 if (!dump_switch_p (arg
))
887 set_fast_math_flags (value
);
891 fix_register (arg
, 1, 1);
894 case OPT_finline_limit_
:
895 case OPT_finline_limit_eq
:
896 set_param_value ("max-inline-insns-single", value
/ 2);
897 set_param_value ("max-inline-insns-auto", value
/ 2);
900 case OPT_fmessage_length_
:
901 pp_set_line_maximum_length (global_dc
->printer
, value
);
904 case OPT_fpack_struct_
:
905 if (value
<= 0 || (value
& (value
- 1)) || value
> 16)
906 error("structure alignment must be a small power of two, not %d", value
);
909 initial_max_fld_align
= value
;
910 maximum_field_alignment
= value
* BITS_PER_UNIT
;
914 case OPT_fpeel_loops
:
915 flag_peel_loops_set
= true;
918 case OPT_fprofile_arcs
:
919 profile_arc_flag_set
= true;
922 case OPT_fprofile_use
:
923 if (!flag_branch_probabilities_set
)
924 flag_branch_probabilities
= value
;
925 if (!flag_profile_values_set
)
926 flag_profile_values
= value
;
927 if (!flag_unroll_loops_set
)
928 flag_unroll_loops
= value
;
929 if (!flag_peel_loops_set
)
930 flag_peel_loops
= value
;
931 if (!flag_tracer_set
)
933 if (!flag_value_profile_transformations_set
)
934 flag_value_profile_transformations
= value
;
935 /* Old loop optimizer is incompatible with tree profiling. */
936 if (!flag_loop_optimize_set
)
937 flag_loop_optimize
= 0;
940 case OPT_fprofile_generate
:
941 if (!profile_arc_flag_set
)
942 profile_arc_flag
= value
;
943 if (!flag_profile_values_set
)
944 flag_profile_values
= value
;
945 if (!flag_value_profile_transformations_set
)
946 flag_value_profile_transformations
= value
;
949 case OPT_fprofile_values
:
950 flag_profile_values_set
= true;
953 case OPT_fvisibility_
:
955 if (!strcmp(arg
, "default"))
956 default_visibility
= VISIBILITY_DEFAULT
;
957 else if (!strcmp(arg
, "internal"))
958 default_visibility
= VISIBILITY_INTERNAL
;
959 else if (!strcmp(arg
, "hidden"))
960 default_visibility
= VISIBILITY_HIDDEN
;
961 else if (!strcmp(arg
, "protected"))
962 default_visibility
= VISIBILITY_PROTECTED
;
964 error ("unrecognized visibility value \"%s\"", arg
);
969 flag_value_profile_transformations_set
= true;
972 case OPT_frandom_seed
:
973 /* The real switch is -fno-random-seed. */
976 flag_random_seed
= NULL
;
979 case OPT_frandom_seed_
:
980 flag_random_seed
= arg
;
983 case OPT_fsched_verbose_
:
984 #ifdef INSN_SCHEDULING
985 fix_sched_param ("verbose", arg
);
991 case OPT_fsched_stalled_insns_
:
992 flag_sched_stalled_insns
= value
;
993 if (flag_sched_stalled_insns
== 0)
994 flag_sched_stalled_insns
= -1;
997 case OPT_fsched_stalled_insns_dep_
:
998 flag_sched_stalled_insns_dep
= value
;
1001 case OPT_fstack_limit
:
1002 /* The real switch is -fno-stack-limit. */
1005 stack_limit_rtx
= NULL_RTX
;
1008 case OPT_fstack_limit_register_
:
1010 int reg
= decode_reg_name (arg
);
1012 error ("unrecognized register name \"%s\"", arg
);
1014 stack_limit_rtx
= gen_rtx_REG (Pmode
, reg
);
1018 case OPT_fstack_limit_symbol_
:
1019 stack_limit_rtx
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (arg
));
1022 case OPT_ftree_vectorizer_verbose_
:
1023 vect_set_verbosity_level (arg
);
1026 case OPT_ftls_model_
:
1027 if (!strcmp (arg
, "global-dynamic"))
1028 flag_tls_default
= TLS_MODEL_GLOBAL_DYNAMIC
;
1029 else if (!strcmp (arg
, "local-dynamic"))
1030 flag_tls_default
= TLS_MODEL_LOCAL_DYNAMIC
;
1031 else if (!strcmp (arg
, "initial-exec"))
1032 flag_tls_default
= TLS_MODEL_INITIAL_EXEC
;
1033 else if (!strcmp (arg
, "local-exec"))
1034 flag_tls_default
= TLS_MODEL_LOCAL_EXEC
;
1036 warning (0, "unknown tls-model \"%s\"", arg
);
1040 flag_tracer_set
= true;
1043 case OPT_funroll_loops
:
1044 flag_unroll_loops_set
= true;
1048 set_debug_level (NO_DEBUG
, DEFAULT_GDB_EXTENSIONS
, arg
);
1052 set_debug_level (SDB_DEBUG
, false, arg
);
1056 set_debug_level (DWARF2_DEBUG
, false, arg
);
1060 set_debug_level (NO_DEBUG
, 2, arg
);
1065 set_debug_level (DBX_DEBUG
, code
== OPT_gstabs_
, arg
);
1069 set_debug_level (VMS_DEBUG
, false, arg
);
1074 set_debug_level (XCOFF_DEBUG
, code
== OPT_gxcoff_
, arg
);
1078 asm_file_name
= arg
;
1081 case OPT_pedantic_errors
:
1082 flag_pedantic_errors
= pedantic
= 1;
1085 case OPT_fforce_mem
:
1086 warning (0, "-f[no-]force-mem is nop and option will be removed in 4.2");
1090 /* If the flag was handled in a standard way, assume the lack of
1091 processing here is intentional. */
1092 gcc_assert (cl_options
[scode
].flag_var
);
1099 /* Handle --param NAME=VALUE. */
1101 handle_param (const char *carg
)
1106 arg
= xstrdup (carg
);
1107 equal
= strchr (arg
, '=');
1109 error ("%s: --param arguments should be of the form NAME=VALUE", arg
);
1112 value
= integral_argument (equal
+ 1);
1114 error ("invalid --param value %qs", equal
+ 1);
1118 set_param_value (arg
, value
);
1125 /* Handle -W and -Wextra. */
1127 set_Wextra (int setting
)
1129 extra_warnings
= setting
;
1130 warn_unused_value
= setting
;
1131 warn_unused_parameter
= (setting
&& maybe_warn_unused_parameter
);
1133 /* We save the value of warn_uninitialized, since if they put
1134 -Wuninitialized on the command line, we need to generate a
1135 warning about not using it without also specifying -O. */
1137 warn_uninitialized
= 0;
1138 else if (warn_uninitialized
!= 1)
1139 warn_uninitialized
= 2;
1142 /* Initialize unused warning flags. */
1144 set_Wunused (int setting
)
1146 warn_unused_function
= setting
;
1147 warn_unused_label
= setting
;
1148 /* Unused function parameter warnings are reported when either
1149 ``-Wextra -Wunused'' or ``-Wunused-parameter'' is specified.
1150 Thus, if -Wextra has already been seen, set warn_unused_parameter;
1151 otherwise set maybe_warn_extra_parameter, which will be picked up
1153 maybe_warn_unused_parameter
= setting
;
1154 warn_unused_parameter
= (setting
&& extra_warnings
);
1155 warn_unused_variable
= setting
;
1156 warn_unused_value
= setting
;
1159 /* The following routines are useful in setting all the flags that
1160 -ffast-math and -fno-fast-math imply. */
1162 set_fast_math_flags (int set
)
1164 flag_trapping_math
= !set
;
1165 flag_unsafe_math_optimizations
= set
;
1166 flag_finite_math_only
= set
;
1167 flag_errno_math
= !set
;
1170 flag_signaling_nans
= 0;
1171 flag_rounding_math
= 0;
1172 flag_cx_limited_range
= 1;
1176 /* Return true iff flags are set as if -ffast-math. */
1178 fast_math_flags_set_p (void)
1180 return (!flag_trapping_math
1181 && flag_unsafe_math_optimizations
1182 && flag_finite_math_only
1183 && !flag_errno_math
);
1186 /* Handle a debug output -g switch. EXTENDED is true or false to support
1187 extended output (2 is special and means "-ggdb" was given). */
1189 set_debug_level (enum debug_info_type type
, int extended
, const char *arg
)
1191 static bool type_explicit
;
1193 use_gnu_debug_info_extensions
= extended
;
1195 if (type
== NO_DEBUG
)
1197 if (write_symbols
== NO_DEBUG
)
1199 write_symbols
= PREFERRED_DEBUGGING_TYPE
;
1203 #ifdef DWARF2_DEBUGGING_INFO
1204 write_symbols
= DWARF2_DEBUG
;
1205 #elif defined DBX_DEBUGGING_INFO
1206 write_symbols
= DBX_DEBUG
;
1210 if (write_symbols
== NO_DEBUG
)
1211 warning (0, "target system does not support debug output");
1216 /* Does it conflict with an already selected type? */
1217 if (type_explicit
&& write_symbols
!= NO_DEBUG
&& type
!= write_symbols
)
1218 error ("debug format \"%s\" conflicts with prior selection",
1219 debug_type_names
[type
]);
1220 write_symbols
= type
;
1221 type_explicit
= true;
1224 /* A debug flag without a level defaults to level 2. */
1227 if (!debug_info_level
)
1228 debug_info_level
= 2;
1232 debug_info_level
= integral_argument (arg
);
1233 if (debug_info_level
== (unsigned int) -1)
1234 error ("unrecognised debug output level \"%s\"", arg
);
1235 else if (debug_info_level
> 3)
1236 error ("debug output level %s is too high", arg
);
1240 /* Display help for target options. */
1242 print_target_help (void)
1245 static bool displayed
= false;
1247 /* Avoid double printing for --help --target-help. */
1252 for (i
= 0; i
< cl_options_count
; i
++)
1253 if ((cl_options
[i
].flags
& (CL_TARGET
| CL_UNDOCUMENTED
)) == CL_TARGET
)
1255 printf (_("\nTarget specific options:\n"));
1256 print_filtered_help (CL_TARGET
);
1261 /* Output --help text. */
1268 GET_ENVIRONMENT (p
, "COLUMNS");
1271 int value
= atoi (p
);
1276 puts (_("The following options are language-independent:\n"));
1278 print_filtered_help (CL_COMMON
);
1279 print_param_help ();
1281 for (i
= 0; lang_names
[i
]; i
++)
1283 printf (_("The %s front end recognizes the following options:\n\n"),
1285 print_filtered_help (1U << i
);
1287 print_target_help ();
1290 /* Print the help for --param. */
1292 print_param_help (void)
1296 puts (_("The --param option recognizes the following as parameters:\n"));
1298 for (i
= 0; i
< LAST_PARAM
; i
++)
1300 const char *help
= compiler_params
[i
].help
;
1301 const char *param
= compiler_params
[i
].option
;
1303 if (help
== NULL
|| *help
== '\0')
1304 help
= undocumented_msg
;
1306 /* Get the translation. */
1309 wrap_help (help
, param
, strlen (param
));
1315 /* Print help for a specific front-end, etc. */
1317 print_filtered_help (unsigned int flag
)
1319 unsigned int i
, len
, filter
, indent
= 0;
1320 bool duplicates
= false;
1321 const char *help
, *opt
, *tab
;
1322 static char *printed
;
1324 if (flag
== CL_COMMON
|| flag
== CL_TARGET
)
1328 printed
= xmalloc (cl_options_count
);
1329 memset (printed
, 0, cl_options_count
);
1333 /* Don't print COMMON options twice. */
1334 filter
= flag
| CL_COMMON
;
1336 for (i
= 0; i
< cl_options_count
; i
++)
1338 if ((cl_options
[i
].flags
& filter
) != flag
)
1341 /* Skip help for internal switches. */
1342 if (cl_options
[i
].flags
& CL_UNDOCUMENTED
)
1345 /* Skip switches that have already been printed, mark them to be
1350 indent
= print_switch (cl_options
[i
].opt_text
, indent
);
1361 for (i
= 0; i
< cl_options_count
; i
++)
1363 if ((cl_options
[i
].flags
& filter
) != flag
)
1366 /* Skip help for internal switches. */
1367 if (cl_options
[i
].flags
& CL_UNDOCUMENTED
)
1370 /* Skip switches that have already been printed. */
1376 help
= cl_options
[i
].help
;
1378 help
= undocumented_msg
;
1380 /* Get the translation. */
1383 tab
= strchr (help
, '\t');
1392 opt
= cl_options
[i
].opt_text
;
1396 wrap_help (help
, opt
, len
);
1402 /* Output ITEM, of length ITEM_WIDTH, in the left column, followed by
1403 word-wrapped HELP in a second column. */
1405 print_switch (const char *text
, unsigned int indent
)
1407 unsigned int len
= strlen (text
) + 1; /* trailing comma */
1412 if (indent
+ len
> columns
)
1423 fputs (text
, stdout
);
1425 return indent
+ len
+ 1;
1428 /* Output ITEM, of length ITEM_WIDTH, in the left column, followed by
1429 word-wrapped HELP in a second column. */
1431 wrap_help (const char *help
, const char *item
, unsigned int item_width
)
1433 unsigned int col_width
= 27;
1434 unsigned int remaining
, room
, len
;
1436 remaining
= strlen (help
);
1440 room
= columns
- 3 - MAX (col_width
, item_width
);
1449 for (i
= 0; help
[i
]; i
++)
1451 if (i
>= room
&& len
!= remaining
)
1455 else if ((help
[i
] == '-' || help
[i
] == '/')
1456 && help
[i
+ 1] != ' '
1457 && i
> 0 && ISALPHA (help
[i
- 1]))
1462 printf( " %-*.*s %.*s\n", col_width
, item_width
, item
, len
, help
);
1464 while (help
[len
] == ' ')
1472 /* Return 1 if OPTION is enabled, 0 if it is disabled, or -1 if it isn't
1473 a simple on-off switch. */
1476 option_enabled (int opt_idx
)
1478 const struct cl_option
*option
= &(cl_options
[opt_idx
]);
1479 if (option
->flag_var
)
1480 switch (option
->var_type
)
1483 return *(int *) option
->flag_var
!= 0;
1486 return *(int *) option
->flag_var
== option
->var_value
;
1488 case CLVC_BIT_CLEAR
:
1489 return (*(int *) option
->flag_var
& option
->var_value
) == 0;
1492 return (*(int *) option
->flag_var
& option
->var_value
) != 0;
1500 /* Fill STATE with the current state of option OPTION. Return true if
1501 there is some state to store. */
1504 get_option_state (int option
, struct cl_option_state
*state
)
1506 if (cl_options
[option
].flag_var
== 0)
1509 switch (cl_options
[option
].var_type
)
1513 state
->data
= cl_options
[option
].flag_var
;
1514 state
->size
= sizeof (int);
1517 case CLVC_BIT_CLEAR
:
1519 state
->ch
= option_enabled (option
);
1520 state
->data
= &state
->ch
;
1525 state
->data
= *(const char **) cl_options
[option
].flag_var
;
1526 if (state
->data
== 0)
1528 state
->size
= strlen (state
->data
) + 1;