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 /* Columns of --help display. */
93 static unsigned int columns
= 80;
95 /* What to print when a switch has no documentation. */
96 static const char undocumented_msg
[] = N_("This switch lacks documentation");
98 /* Used for bookkeeping on whether user set these flags so
99 -fprofile-use/-fprofile-generate does not use them. */
100 static bool profile_arc_flag_set
, flag_profile_values_set
;
101 static bool flag_unroll_loops_set
, flag_tracer_set
;
102 static bool flag_value_profile_transformations_set
;
103 static bool flag_peel_loops_set
, flag_branch_probabilities_set
;
105 /* Input file names. */
106 const char **in_fnames
;
107 unsigned num_in_fnames
;
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 /* If ARG is a non-negative integer made up solely of digits, return its
128 value, otherwise return -1. */
130 integral_argument (const char *arg
)
134 while (*p
&& ISDIGIT (*p
))
143 /* Return a malloced slash-separated list of languages in MASK. */
145 write_langs (unsigned int mask
)
147 unsigned int n
= 0, len
= 0;
148 const char *lang_name
;
151 for (n
= 0; (lang_name
= lang_names
[n
]) != 0; n
++)
152 if (mask
& (1U << n
))
153 len
+= strlen (lang_name
) + 1;
155 result
= XNEWVEC (char, len
);
157 for (n
= 0; (lang_name
= lang_names
[n
]) != 0; n
++)
158 if (mask
& (1U << n
))
162 strcpy (result
+ len
, lang_name
);
163 len
+= strlen (lang_name
);
171 /* Complain that switch OPT_INDEX does not apply to this front end. */
173 complain_wrong_lang (const char *text
, const struct cl_option
*option
,
174 unsigned int lang_mask
)
176 char *ok_langs
, *bad_lang
;
178 ok_langs
= write_langs (option
->flags
);
179 bad_lang
= write_langs (lang_mask
);
181 /* Eventually this should become a hard error IMO. */
182 warning (0, "command line option \"%s\" is valid for %s but not for %s",
183 text
, ok_langs
, bad_lang
);
189 /* Handle the switch beginning at ARGV for the language indicated by
190 LANG_MASK. Returns the number of switches consumed. */
192 handle_option (const char **argv
, unsigned int lang_mask
)
195 const char *opt
, *arg
= 0;
198 unsigned int result
= 0;
199 const struct cl_option
*option
;
203 opt_index
= find_opt (opt
+ 1, lang_mask
| CL_COMMON
| CL_TARGET
);
204 if (opt_index
== cl_options_count
205 && (opt
[1] == 'W' || opt
[1] == 'f' || opt
[1] == 'm')
206 && opt
[2] == 'n' && opt
[3] == 'o' && opt
[4] == '-')
208 /* Drop the "no-" from negative switches. */
209 size_t len
= strlen (opt
) - 3;
211 dup
= XNEWVEC (char, len
+ 1);
214 memcpy (dup
+ 2, opt
+ 5, len
- 2 + 1);
217 opt_index
= find_opt (opt
+ 1, lang_mask
| CL_COMMON
| CL_TARGET
);
220 if (opt_index
== cl_options_count
)
223 option
= &cl_options
[opt_index
];
225 /* Reject negative form of switches that don't take negatives as
227 if (!value
&& (option
->flags
& CL_REJECT_NEGATIVE
))
230 /* We've recognized this switch. */
233 /* Check to see if the option is disabled for this configuration. */
234 if (option
->flags
& CL_DISABLED
)
236 error ("command line option %qs"
237 " is not supported by this configuration", opt
);
241 /* Sort out any argument the switch takes. */
242 if (option
->flags
& CL_JOINED
)
244 /* Have arg point to the original switch. This is because
245 some code, such as disable_builtin_function, expects its
246 argument to be persistent until the program exits. */
247 arg
= argv
[0] + cl_options
[opt_index
].opt_len
+ 1;
249 arg
+= strlen ("no-");
251 if (*arg
== '\0' && !(option
->flags
& CL_MISSING_OK
))
253 if (option
->flags
& CL_SEPARATE
)
259 /* Missing argument. */
263 else if (option
->flags
& CL_SEPARATE
)
269 /* Now we've swallowed any potential argument, complain if this
270 is a switch for a different front end. */
271 if (!(option
->flags
& (lang_mask
| CL_COMMON
| CL_TARGET
)))
273 complain_wrong_lang (argv
[0], option
, lang_mask
);
277 if (arg
== NULL
&& (option
->flags
& (CL_JOINED
| CL_SEPARATE
)))
279 if (!lang_hooks
.missing_argument (opt
, opt_index
))
280 error ("missing argument to \"%s\"", opt
);
284 /* If the switch takes an integer, convert it. */
285 if (arg
&& (option
->flags
& CL_UINTEGER
))
287 value
= integral_argument (arg
);
290 error ("argument to \"%s\" should be a non-negative integer",
296 if (option
->flag_var
)
297 switch (option
->var_type
)
300 *(int *) option
->flag_var
= value
;
304 *(int *) option
->flag_var
= (value
306 : !option
->var_value
);
311 if ((value
!= 0) == (option
->var_type
== CLVC_BIT_SET
))
312 *(int *) option
->flag_var
|= option
->var_value
;
314 *(int *) option
->flag_var
&= ~option
->var_value
;
315 if (option
->flag_var
== &target_flags
)
316 target_flags_explicit
|= option
->var_value
;
320 *(const char **) option
->flag_var
= arg
;
324 if (option
->flags
& lang_mask
)
325 if (lang_hooks
.handle_option (opt_index
, arg
, value
) == 0)
328 if (result
&& (option
->flags
& CL_COMMON
))
329 if (common_handle_option (opt_index
, arg
, value
, lang_mask
) == 0)
332 if (result
&& (option
->flags
& CL_TARGET
))
333 if (!targetm
.handle_option (opt_index
, arg
, value
))
342 /* Handle FILENAME from the command line. */
344 add_input_filename (const char *filename
)
347 in_fnames
= xrealloc (in_fnames
, num_in_fnames
* sizeof (in_fnames
[0]));
348 in_fnames
[num_in_fnames
- 1] = filename
;
351 /* Decode and handle the vector of command line options. LANG_MASK
352 contains has a single bit set representing the current
355 handle_options (unsigned int argc
, const char **argv
, unsigned int lang_mask
)
359 for (i
= 1; i
< argc
; i
+= n
)
361 const char *opt
= argv
[i
];
363 /* Interpret "-" or a non-switch as a file name. */
364 if (opt
[0] != '-' || opt
[1] == '\0')
366 if (main_input_filename
== NULL
)
367 main_input_filename
= opt
;
368 add_input_filename (opt
);
373 n
= handle_option (argv
+ i
, lang_mask
);
378 error ("unrecognized command line option \"%s\"", opt
);
383 /* Parse command line options and set default flag values. Do minimal
384 options processing. */
386 decode_options (unsigned int argc
, const char **argv
)
388 unsigned int i
, lang_mask
;
390 /* Perform language-specific options initialization. */
391 lang_mask
= lang_hooks
.init_options (argc
, argv
);
393 lang_hooks
.initialize_diagnostics (global_dc
);
395 /* Scan to see what optimization level has been specified. That will
396 determine the default value of many flags. */
397 for (i
= 1; i
< argc
; i
++)
399 if (!strcmp (argv
[i
], "-O"))
404 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'O')
406 /* Handle -Os, -O2, -O3, -O69, ... */
407 const char *p
= &argv
[i
][2];
409 if ((p
[0] == 's') && (p
[1] == 0))
413 /* Optimizing for size forces optimize to be 2. */
418 const int optimize_val
= read_integral_parameter (p
, p
- 2, -1);
419 if (optimize_val
!= -1)
421 optimize
= optimize_val
;
430 flag_merge_constants
= 0;
437 flag_delayed_branch
= 1;
439 #ifdef CAN_DEBUG_WITHOUT_FP
440 flag_omit_frame_pointer
= 1;
442 flag_guess_branch_prob
= 1;
443 flag_cprop_registers
= 1;
444 flag_if_conversion
= 1;
445 flag_if_conversion2
= 1;
446 flag_ipa_pure_const
= 1;
447 flag_ipa_reference
= 1;
454 flag_tree_copyrename
= 1;
456 flag_tree_copy_prop
= 1;
458 flag_tree_salias
= 1;
459 if (!no_unit_at_a_time_default
)
460 flag_unit_at_a_time
= 1;
464 /* Loop header copying usually increases size of the code. This used
465 not to be true, since quite often it is possible to verify that
466 the condition is satisfied in the first iteration and therefore
467 to eliminate it. Jump threading handles these cases now. */
474 flag_thread_jumps
= 1;
475 flag_crossjumping
= 1;
476 flag_optimize_sibling_calls
= 1;
477 flag_forward_propagate
= 1;
478 flag_cse_follow_jumps
= 1;
480 flag_expensive_optimizations
= 1;
481 flag_ipa_type_escape
= 1;
482 flag_rerun_cse_after_loop
= 1;
483 flag_caller_saves
= 1;
485 #ifdef INSN_SCHEDULING
486 flag_schedule_insns
= 1;
487 flag_schedule_insns_after_reload
= 1;
490 flag_strict_aliasing
= 1;
491 flag_strict_overflow
= 1;
492 flag_delete_null_pointer_checks
= 1;
493 flag_reorder_blocks
= 1;
494 flag_reorder_functions
= 1;
495 flag_tree_store_ccp
= 1;
496 flag_tree_store_copy_prop
= 1;
501 /* PRE tends to generate bigger code. */
508 flag_inline_functions
= 1;
509 flag_unswitch_loops
= 1;
510 flag_gcse_after_reload
= 1;
513 if (optimize
< 2 || optimize_size
)
520 /* Don't reorder blocks when optimizing for size because extra
521 jump insns may be created; also barrier may create extra padding.
523 More correctly we should have a block reordering mode that tried
524 to minimize the combined size of all the jumps. This would more
525 or less automatically remove extra jumps, but would also try to
526 use more short jumps instead of long jumps. */
527 flag_reorder_blocks
= 0;
528 flag_reorder_blocks_and_partition
= 0;
533 /* Inlining of very small functions usually reduces total size. */
534 set_param_value ("max-inline-insns-single", 5);
535 set_param_value ("max-inline-insns-auto", 5);
536 flag_inline_functions
= 1;
538 /* We want to crossjump as much as possible. */
539 set_param_value ("min-crossjump-insns", 1);
542 /* Initialize whether `char' is signed. */
543 flag_signed_char
= DEFAULT_SIGNED_CHAR
;
544 /* Set this to a special "uninitialized" value. The actual default is set
545 after target options have been processed. */
546 flag_short_enums
= 2;
548 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
550 target_flags
= targetm
.default_target_flags
;
552 /* Some tagets have ABI-specified unwind tables. */
553 flag_unwind_tables
= targetm
.unwind_tables_default
;
555 #ifdef OPTIMIZATION_OPTIONS
556 /* Allow default optimizations to be specified on a per-machine basis. */
557 OPTIMIZATION_OPTIONS (optimize
, optimize_size
);
560 handle_options (argc
, argv
, lang_mask
);
564 if (flag_pic
&& !flag_pie
)
567 if (flag_no_inline
== 2)
570 flag_really_no_inline
= flag_no_inline
;
572 /* Set flag_no_inline before the post_options () hook. The C front
573 ends use it to determine tree inlining defaults. FIXME: such
574 code should be lang-independent when all front ends use tree
575 inlining, in which case it, and this condition, should be moved
576 to the top of process_options() instead. */
579 /* Inlining does not work if not optimizing,
580 so force it not to be done. */
584 /* The c_decode_option function and decode_option hook set
585 this to `2' if -Wall is used, so we can avoid giving out
586 lots of errors for people who don't realize what -Wall does. */
587 if (warn_uninitialized
== 1)
588 warning (OPT_Wuninitialized
,
589 "-Wuninitialized is not supported without -O");
592 if (flag_really_no_inline
== 2)
593 flag_really_no_inline
= flag_no_inline
;
595 /* The optimization to partition hot and cold basic blocks into separate
596 sections of the .o and executable files does not work (currently)
597 with exception handling. This is because there is no support for
598 generating unwind info. If flag_exceptions is turned on we need to
599 turn off the partitioning optimization. */
601 if (flag_exceptions
&& flag_reorder_blocks_and_partition
)
604 ("-freorder-blocks-and-partition does not work with exceptions");
605 flag_reorder_blocks_and_partition
= 0;
606 flag_reorder_blocks
= 1;
609 /* If user requested unwind info, then turn off the partitioning
612 if (flag_unwind_tables
&& ! targetm
.unwind_tables_default
613 && flag_reorder_blocks_and_partition
)
615 inform ("-freorder-blocks-and-partition does not support unwind info");
616 flag_reorder_blocks_and_partition
= 0;
617 flag_reorder_blocks
= 1;
620 /* If the target requested unwind info, then turn off the partitioning
621 optimization with a different message. Likewise, if the target does not
622 support named sections. */
624 if (flag_reorder_blocks_and_partition
625 && (!targetm
.have_named_sections
626 || (flag_unwind_tables
&& targetm
.unwind_tables_default
)))
629 ("-freorder-blocks-and-partition does not work on this architecture");
630 flag_reorder_blocks_and_partition
= 0;
631 flag_reorder_blocks
= 1;
635 /* Handle target- and language-independent options. Return zero to
636 generate an "unknown option" message. Only options that need
637 extra handling need to be listed here; if you simply want
638 VALUE assigned to a variable, it happens automatically. */
641 common_handle_option (size_t scode
, const char *arg
, int value
,
642 unsigned int lang_mask
)
644 enum opt_code code
= (enum opt_code
) scode
;
650 exit_after_options
= true;
657 case OPT__target_help
:
658 print_target_help ();
659 exit_after_options
= true;
663 print_version (stderr
, "");
664 exit_after_options
= true;
668 g_switch_value
= value
;
674 /* Currently handled in a prescan. */
678 /* For backward compatibility, -W is the same as -Wextra. */
686 new_option
= XNEWVEC (char, strlen (arg
) + 2);
688 strcpy (new_option
+1, arg
);
689 option_index
= find_opt (new_option
, lang_mask
);
690 if (option_index
== N_OPTS
)
692 error ("-Werror-%s: No option -%s", arg
, new_option
);
696 int kind
= value
? DK_ERROR
: DK_WARNING
;
697 diagnostic_classify_diagnostic (global_dc
, option_index
, kind
);
699 /* -Werror=foo implies -Wfoo. */
700 if (cl_options
[option_index
].var_type
== CLVC_BOOLEAN
701 && cl_options
[option_index
].flag_var
703 *(int *) cl_options
[option_index
].flag_var
= 1;
713 case OPT_Wlarger_than_
:
714 larger_than_size
= value
;
715 warn_larger_than
= value
!= -1;
718 case OPT_Wstrict_aliasing
:
719 case OPT_Wstrict_aliasing_
:
720 warn_strict_aliasing
= value
;
729 aux_info_file_name
= arg
;
730 flag_gen_aux_info
= 1;
737 case OPT_auxbase_strip
:
739 char *tmp
= xstrdup (arg
);
740 strip_off_ending (tmp
, strlen (tmp
));
747 decode_d_option (arg
);
751 dump_base_name
= arg
;
754 case OPT_falign_functions_
:
755 align_functions
= value
;
758 case OPT_falign_jumps_
:
762 case OPT_falign_labels_
:
763 align_labels
= value
;
766 case OPT_falign_loops_
:
770 case OPT_fbranch_probabilities
:
771 flag_branch_probabilities_set
= true;
774 case OPT_fcall_used_
:
775 fix_register (arg
, 0, 1);
778 case OPT_fcall_saved_
:
779 fix_register (arg
, 0, 0);
782 case OPT_fdiagnostics_show_location_
:
783 if (!strcmp (arg
, "once"))
784 diagnostic_prefixing_rule (global_dc
) = DIAGNOSTICS_SHOW_PREFIX_ONCE
;
785 else if (!strcmp (arg
, "every-line"))
786 diagnostic_prefixing_rule (global_dc
)
787 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE
;
792 case OPT_fdiagnostics_show_option
:
793 global_dc
->show_option_requested
= true;
797 if (!dump_switch_p (arg
))
802 set_fast_math_flags (value
);
806 fix_register (arg
, 1, 1);
809 case OPT_finline_limit_
:
810 case OPT_finline_limit_eq
:
811 set_param_value ("max-inline-insns-single", value
/ 2);
812 set_param_value ("max-inline-insns-auto", value
/ 2);
815 case OPT_fmessage_length_
:
816 pp_set_line_maximum_length (global_dc
->printer
, value
);
819 case OPT_fpack_struct_
:
820 if (value
<= 0 || (value
& (value
- 1)) || value
> 16)
821 error("structure alignment must be a small power of two, not %d", value
);
824 initial_max_fld_align
= value
;
825 maximum_field_alignment
= value
* BITS_PER_UNIT
;
829 case OPT_fpeel_loops
:
830 flag_peel_loops_set
= true;
833 case OPT_fprofile_arcs
:
834 profile_arc_flag_set
= true;
837 case OPT_fprofile_use
:
838 if (!flag_branch_probabilities_set
)
839 flag_branch_probabilities
= value
;
840 if (!flag_profile_values_set
)
841 flag_profile_values
= value
;
842 if (!flag_unroll_loops_set
)
843 flag_unroll_loops
= value
;
844 if (!flag_peel_loops_set
)
845 flag_peel_loops
= value
;
846 if (!flag_tracer_set
)
848 if (!flag_value_profile_transformations_set
)
849 flag_value_profile_transformations
= value
;
852 case OPT_fprofile_generate
:
853 if (!profile_arc_flag_set
)
854 profile_arc_flag
= value
;
855 if (!flag_profile_values_set
)
856 flag_profile_values
= value
;
857 if (!flag_value_profile_transformations_set
)
858 flag_value_profile_transformations
= value
;
861 case OPT_fprofile_values
:
862 flag_profile_values_set
= true;
865 case OPT_fvisibility_
:
867 if (!strcmp(arg
, "default"))
868 default_visibility
= VISIBILITY_DEFAULT
;
869 else if (!strcmp(arg
, "internal"))
870 default_visibility
= VISIBILITY_INTERNAL
;
871 else if (!strcmp(arg
, "hidden"))
872 default_visibility
= VISIBILITY_HIDDEN
;
873 else if (!strcmp(arg
, "protected"))
874 default_visibility
= VISIBILITY_PROTECTED
;
876 error ("unrecognized visibility value \"%s\"", arg
);
881 flag_value_profile_transformations_set
= true;
884 case OPT_frandom_seed
:
885 /* The real switch is -fno-random-seed. */
888 flag_random_seed
= NULL
;
891 case OPT_frandom_seed_
:
892 flag_random_seed
= arg
;
895 case OPT_fsched_verbose_
:
896 #ifdef INSN_SCHEDULING
897 fix_sched_param ("verbose", arg
);
903 case OPT_fsched_stalled_insns_
:
904 flag_sched_stalled_insns
= value
;
905 if (flag_sched_stalled_insns
== 0)
906 flag_sched_stalled_insns
= -1;
909 case OPT_fsched_stalled_insns_dep_
:
910 flag_sched_stalled_insns_dep
= value
;
913 case OPT_fstack_limit
:
914 /* The real switch is -fno-stack-limit. */
917 stack_limit_rtx
= NULL_RTX
;
920 case OPT_fstack_limit_register_
:
922 int reg
= decode_reg_name (arg
);
924 error ("unrecognized register name \"%s\"", arg
);
926 stack_limit_rtx
= gen_rtx_REG (Pmode
, reg
);
930 case OPT_fstack_limit_symbol_
:
931 stack_limit_rtx
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (arg
));
934 case OPT_ftree_vectorizer_verbose_
:
935 vect_set_verbosity_level (arg
);
938 case OPT_ftls_model_
:
939 if (!strcmp (arg
, "global-dynamic"))
940 flag_tls_default
= TLS_MODEL_GLOBAL_DYNAMIC
;
941 else if (!strcmp (arg
, "local-dynamic"))
942 flag_tls_default
= TLS_MODEL_LOCAL_DYNAMIC
;
943 else if (!strcmp (arg
, "initial-exec"))
944 flag_tls_default
= TLS_MODEL_INITIAL_EXEC
;
945 else if (!strcmp (arg
, "local-exec"))
946 flag_tls_default
= TLS_MODEL_LOCAL_EXEC
;
948 warning (0, "unknown tls-model \"%s\"", arg
);
952 flag_tracer_set
= true;
955 case OPT_funroll_loops
:
956 flag_unroll_loops_set
= true;
960 set_debug_level (NO_DEBUG
, DEFAULT_GDB_EXTENSIONS
, arg
);
964 set_debug_level (SDB_DEBUG
, false, arg
);
968 set_debug_level (DWARF2_DEBUG
, false, arg
);
972 set_debug_level (NO_DEBUG
, 2, arg
);
977 set_debug_level (DBX_DEBUG
, code
== OPT_gstabs_
, arg
);
981 set_debug_level (VMS_DEBUG
, false, arg
);
986 set_debug_level (XCOFF_DEBUG
, code
== OPT_gxcoff_
, arg
);
993 case OPT_pedantic_errors
:
994 flag_pedantic_errors
= pedantic
= 1;
997 case OPT_floop_optimize
:
998 case OPT_frerun_loop_opt
:
999 case OPT_fstrength_reduce
:
1000 /* These are no-ops, preserved for backward compatibility. */
1004 /* If the flag was handled in a standard way, assume the lack of
1005 processing here is intentional. */
1006 gcc_assert (cl_options
[scode
].flag_var
);
1013 /* Handle --param NAME=VALUE. */
1015 handle_param (const char *carg
)
1020 arg
= xstrdup (carg
);
1021 equal
= strchr (arg
, '=');
1023 error ("%s: --param arguments should be of the form NAME=VALUE", arg
);
1026 value
= integral_argument (equal
+ 1);
1028 error ("invalid --param value %qs", equal
+ 1);
1032 set_param_value (arg
, value
);
1039 /* Handle -W and -Wextra. */
1041 set_Wextra (int setting
)
1043 extra_warnings
= setting
;
1044 warn_unused_value
= setting
;
1045 warn_unused_parameter
= (setting
&& maybe_warn_unused_parameter
);
1047 /* We save the value of warn_uninitialized, since if they put
1048 -Wuninitialized on the command line, we need to generate a
1049 warning about not using it without also specifying -O. */
1051 warn_uninitialized
= 0;
1052 else if (warn_uninitialized
!= 1)
1053 warn_uninitialized
= 2;
1056 /* Initialize unused warning flags. */
1058 set_Wunused (int setting
)
1060 warn_unused_function
= setting
;
1061 warn_unused_label
= setting
;
1062 /* Unused function parameter warnings are reported when either
1063 ``-Wextra -Wunused'' or ``-Wunused-parameter'' is specified.
1064 Thus, if -Wextra has already been seen, set warn_unused_parameter;
1065 otherwise set maybe_warn_extra_parameter, which will be picked up
1067 maybe_warn_unused_parameter
= setting
;
1068 warn_unused_parameter
= (setting
&& extra_warnings
);
1069 warn_unused_variable
= setting
;
1070 warn_unused_value
= setting
;
1073 /* The following routines are useful in setting all the flags that
1074 -ffast-math and -fno-fast-math imply. */
1076 set_fast_math_flags (int set
)
1078 flag_trapping_math
= !set
;
1079 flag_unsafe_math_optimizations
= set
;
1080 flag_finite_math_only
= set
;
1081 flag_signed_zeros
= !set
;
1082 flag_errno_math
= !set
;
1085 flag_signaling_nans
= 0;
1086 flag_rounding_math
= 0;
1087 flag_cx_limited_range
= 1;
1091 /* Return true iff flags are set as if -ffast-math. */
1093 fast_math_flags_set_p (void)
1095 return (!flag_trapping_math
1096 && flag_unsafe_math_optimizations
1097 && flag_finite_math_only
1098 && !flag_signed_zeros
1099 && !flag_errno_math
);
1102 /* Handle a debug output -g switch. EXTENDED is true or false to support
1103 extended output (2 is special and means "-ggdb" was given). */
1105 set_debug_level (enum debug_info_type type
, int extended
, const char *arg
)
1107 static bool type_explicit
;
1109 use_gnu_debug_info_extensions
= extended
;
1111 if (type
== NO_DEBUG
)
1113 if (write_symbols
== NO_DEBUG
)
1115 write_symbols
= PREFERRED_DEBUGGING_TYPE
;
1119 #ifdef DWARF2_DEBUGGING_INFO
1120 write_symbols
= DWARF2_DEBUG
;
1121 #elif defined DBX_DEBUGGING_INFO
1122 write_symbols
= DBX_DEBUG
;
1126 if (write_symbols
== NO_DEBUG
)
1127 warning (0, "target system does not support debug output");
1132 /* Does it conflict with an already selected type? */
1133 if (type_explicit
&& write_symbols
!= NO_DEBUG
&& type
!= write_symbols
)
1134 error ("debug format \"%s\" conflicts with prior selection",
1135 debug_type_names
[type
]);
1136 write_symbols
= type
;
1137 type_explicit
= true;
1140 /* A debug flag without a level defaults to level 2. */
1143 if (!debug_info_level
)
1144 debug_info_level
= 2;
1148 debug_info_level
= integral_argument (arg
);
1149 if (debug_info_level
== (unsigned int) -1)
1150 error ("unrecognised debug output level \"%s\"", arg
);
1151 else if (debug_info_level
> 3)
1152 error ("debug output level %s is too high", arg
);
1156 /* Display help for target options. */
1158 print_target_help (void)
1161 static bool displayed
= false;
1163 /* Avoid double printing for --help --target-help. */
1168 for (i
= 0; i
< cl_options_count
; i
++)
1169 if ((cl_options
[i
].flags
& (CL_TARGET
| CL_UNDOCUMENTED
)) == CL_TARGET
)
1171 printf (_("\nTarget specific options:\n"));
1172 print_filtered_help (CL_TARGET
);
1177 /* Output --help text. */
1184 GET_ENVIRONMENT (p
, "COLUMNS");
1187 int value
= atoi (p
);
1192 puts (_("The following options are language-independent:\n"));
1194 print_filtered_help (CL_COMMON
);
1195 print_param_help ();
1197 for (i
= 0; lang_names
[i
]; i
++)
1199 printf (_("The %s front end recognizes the following options:\n\n"),
1201 print_filtered_help (1U << i
);
1203 print_target_help ();
1206 /* Print the help for --param. */
1208 print_param_help (void)
1212 puts (_("The --param option recognizes the following as parameters:\n"));
1214 for (i
= 0; i
< LAST_PARAM
; i
++)
1216 const char *help
= compiler_params
[i
].help
;
1217 const char *param
= compiler_params
[i
].option
;
1219 if (help
== NULL
|| *help
== '\0')
1220 help
= undocumented_msg
;
1222 /* Get the translation. */
1225 wrap_help (help
, param
, strlen (param
));
1231 /* Print help for a specific front-end, etc. */
1233 print_filtered_help (unsigned int flag
)
1235 unsigned int i
, len
, filter
, indent
= 0;
1236 bool duplicates
= false;
1237 const char *help
, *opt
, *tab
;
1238 static char *printed
;
1240 if (flag
== CL_COMMON
|| flag
== CL_TARGET
)
1244 printed
= xmalloc (cl_options_count
);
1245 memset (printed
, 0, cl_options_count
);
1249 /* Don't print COMMON options twice. */
1250 filter
= flag
| CL_COMMON
;
1252 for (i
= 0; i
< cl_options_count
; i
++)
1254 if ((cl_options
[i
].flags
& filter
) != flag
)
1257 /* Skip help for internal switches. */
1258 if (cl_options
[i
].flags
& CL_UNDOCUMENTED
)
1261 /* Skip switches that have already been printed, mark them to be
1266 indent
= print_switch (cl_options
[i
].opt_text
, indent
);
1277 for (i
= 0; i
< cl_options_count
; i
++)
1279 if ((cl_options
[i
].flags
& filter
) != flag
)
1282 /* Skip help for internal switches. */
1283 if (cl_options
[i
].flags
& CL_UNDOCUMENTED
)
1286 /* Skip switches that have already been printed. */
1292 help
= cl_options
[i
].help
;
1294 help
= undocumented_msg
;
1296 /* Get the translation. */
1299 tab
= strchr (help
, '\t');
1308 opt
= cl_options
[i
].opt_text
;
1312 wrap_help (help
, opt
, len
);
1318 /* Output ITEM, of length ITEM_WIDTH, in the left column, followed by
1319 word-wrapped HELP in a second column. */
1321 print_switch (const char *text
, unsigned int indent
)
1323 unsigned int len
= strlen (text
) + 1; /* trailing comma */
1328 if (indent
+ len
> columns
)
1339 fputs (text
, stdout
);
1341 return indent
+ len
+ 1;
1344 /* Output ITEM, of length ITEM_WIDTH, in the left column, followed by
1345 word-wrapped HELP in a second column. */
1347 wrap_help (const char *help
, const char *item
, unsigned int item_width
)
1349 unsigned int col_width
= 27;
1350 unsigned int remaining
, room
, len
;
1352 remaining
= strlen (help
);
1356 room
= columns
- 3 - MAX (col_width
, item_width
);
1365 for (i
= 0; help
[i
]; i
++)
1367 if (i
>= room
&& len
!= remaining
)
1371 else if ((help
[i
] == '-' || help
[i
] == '/')
1372 && help
[i
+ 1] != ' '
1373 && i
> 0 && ISALPHA (help
[i
- 1]))
1378 printf( " %-*.*s %.*s\n", col_width
, item_width
, item
, len
, help
);
1380 while (help
[len
] == ' ')
1388 /* Return 1 if OPTION is enabled, 0 if it is disabled, or -1 if it isn't
1389 a simple on-off switch. */
1392 option_enabled (int opt_idx
)
1394 const struct cl_option
*option
= &(cl_options
[opt_idx
]);
1395 if (option
->flag_var
)
1396 switch (option
->var_type
)
1399 return *(int *) option
->flag_var
!= 0;
1402 return *(int *) option
->flag_var
== option
->var_value
;
1404 case CLVC_BIT_CLEAR
:
1405 return (*(int *) option
->flag_var
& option
->var_value
) == 0;
1408 return (*(int *) option
->flag_var
& option
->var_value
) != 0;
1416 /* Fill STATE with the current state of option OPTION. Return true if
1417 there is some state to store. */
1420 get_option_state (int option
, struct cl_option_state
*state
)
1422 if (cl_options
[option
].flag_var
== 0)
1425 switch (cl_options
[option
].var_type
)
1429 state
->data
= cl_options
[option
].flag_var
;
1430 state
->size
= sizeof (int);
1433 case CLVC_BIT_CLEAR
:
1435 state
->ch
= option_enabled (option
);
1436 state
->data
= &state
->ch
;
1441 state
->data
= *(const char **) cl_options
[option
].flag_var
;
1442 if (state
->data
== 0)
1444 state
->size
= strlen (state
->data
) + 1;