1 /* Command line option handling.
2 Copyright (C) 2002, 2003, 2004 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, 59 Temple Place - Suite 330, 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 /* Value of the -G xx switch, and whether it was passed or not. */
42 unsigned HOST_WIDE_INT g_switch_value
;
45 /* True if we should exit after parsing options. */
46 bool exit_after_options
;
51 /* Print various extra warnings. -W/-Wextra. */
54 /* Don't print warning messages. -w. */
55 bool inhibit_warnings
;
57 /* Treat warnings as errors. -Werror. */
58 bool warnings_are_errors
;
60 /* Warn if a function returns an aggregate, since there are often
61 incompatible calling conventions for doing this. */
62 bool warn_aggregate_return
;
64 /* Nonzero means warn about pointer casts that increase the required
65 alignment of the target type (and might therefore lead to a crash
66 due to a misaligned access). */
69 /* Nonzero means warn about uses of __attribute__((deprecated))
71 bool warn_deprecated_decl
= true;
73 /* Warn when an optimization pass is disabled. */
74 bool warn_disabled_optimization
;
76 /* Nonzero means warn if inline function is too large. */
79 /* True to warn about any objects definitions whose size is larger
80 than N bytes. Also want about function definitions whose returned
81 values are larger than N bytes, where N is `larger_than_size'. */
82 bool warn_larger_than
;
83 HOST_WIDE_INT larger_than_size
;
85 /* Warn about functions which might be candidates for attribute noreturn. */
86 bool warn_missing_noreturn
;
88 /* True to warn about code which is never reached. */
91 /* Warn if packed attribute on struct is unnecessary and inefficient. */
94 /* Warn when gcc pads a structure to an alignment boundary. */
97 /* True means warn about all declarations which shadow others. */
100 /* Nonzero means warn about constructs which might not be
101 strict-aliasing safe. */
102 bool warn_strict_aliasing
;
104 /* True to warn if a switch on an enum, that does not have a default
105 case, fails to have a case for every enum value. */
108 /* Warn if a switch does not have a default case. */
109 bool warn_switch_default
;
111 /* Warn if a switch on an enum fails to have a case for every enum
112 value (regardless of the presence or otherwise of a default case). */
113 bool warn_switch_enum
;
115 /* Don't suppress warnings from system headers. -Wsystem-headers. */
116 bool warn_system_headers
;
118 /* True to warn about variables used before they are initialized. */
119 int warn_uninitialized
;
121 /* True to warn about unused variables, functions et.al. */
122 bool warn_unused_function
;
123 bool warn_unused_label
;
124 bool warn_unused_parameter
;
125 bool warn_unused_variable
;
126 bool warn_unused_value
;
128 /* Hack for cooperation between set_Wunused and set_Wextra. */
129 static bool maybe_warn_unused_parameter
;
131 /* Type(s) of debugging information we are producing (if any). See
132 flags.h for the definitions of the different possible types of
133 debugging information. */
134 enum debug_info_type write_symbols
= NO_DEBUG
;
136 /* Level of debugging information we are producing. See flags.h for
137 the definitions of the different possible levels. */
138 enum debug_info_level debug_info_level
= DINFO_LEVEL_NONE
;
140 /* Nonzero means use GNU-only extensions in the generated symbolic
141 debugging information. Currently, this only has an effect when
142 write_symbols is set to DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
143 bool use_gnu_debug_info_extensions
;
145 /* Columns of --help display. */
146 static unsigned int columns
= 80;
148 /* What to print when a switch has no documentation. */
149 static const char undocumented_msg
[] = N_("This switch lacks documentation");
151 /* Used for bookkeeping on whether user set these flags so
152 -fprofile-use/-fprofile-generate does not use them. */
153 static bool profile_arc_flag_set
, flag_profile_values_set
;
154 static bool flag_unroll_loops_set
, flag_tracer_set
;
155 static bool flag_value_profile_transformations_set
;
156 static bool flag_peel_loops_set
, flag_branch_probabilities_set
;
158 /* Input file names. */
159 const char **in_fnames
;
160 unsigned num_in_fnames
;
162 static size_t find_opt (const char *, int);
163 static int common_handle_option (size_t scode
, const char *arg
, int value
);
164 static void handle_param (const char *);
165 static void set_Wextra (int);
166 static unsigned int handle_option (const char **argv
, unsigned int lang_mask
);
167 static char *write_langs (unsigned int lang_mask
);
168 static void complain_wrong_lang (const char *, const struct cl_option
*,
169 unsigned int lang_mask
);
170 static void handle_options (unsigned int, const char **, unsigned int);
171 static void wrap_help (const char *help
, const char *item
, unsigned int);
172 static void print_help (void);
173 static void print_param_help (void);
174 static void print_filtered_help (unsigned int flag
);
175 static unsigned int print_switch (const char *text
, unsigned int indent
);
176 static void set_debug_level (enum debug_info_type type
, int extended
,
179 /* Perform a binary search to find which option the command-line INPUT
180 matches. Returns its index in the option array, and N_OPTS
181 (cl_options_count) on failure.
183 This routine is quite subtle. A normal binary search is not good
184 enough because some options can be suffixed with an argument, and
185 multiple sub-matches can occur, e.g. input of "-pedantic" matching
186 the initial substring of "-pedantic-errors".
188 A more complicated example is -gstabs. It should match "-g" with
189 an argument of "stabs". Suppose, however, that the number and list
190 of switches are such that the binary search tests "-gen-decls"
191 before having tested "-g". This doesn't match, and as "-gen-decls"
192 is less than "-gstabs", it will become the lower bound of the
193 binary search range, and "-g" will never be seen. To resolve this
194 issue, opts.sh makes "-gen-decls" point, via the back_chain member,
195 to "-g" so that failed searches that end between "-gen-decls" and
196 the lexicographically subsequent switch know to go back and see if
197 "-g" causes a match (which it does in this example).
199 This search is done in such a way that the longest match for the
200 front end in question wins. If there is no match for the current
201 front end, the longest match for a different front end is returned
202 (or N_OPTS if none) and the caller emits an error message. */
204 find_opt (const char *input
, int lang_mask
)
206 size_t mn
, mx
, md
, opt_len
;
207 size_t match_wrong_lang
;
211 mx
= cl_options_count
;
213 /* Find mn such this lexicographical inequality holds:
214 cl_options[mn] <= input < cl_options[mn + 1]. */
218 opt_len
= cl_options
[md
].opt_len
;
219 comp
= strncmp (input
, cl_options
[md
].opt_text
+ 1, opt_len
);
227 /* This is the switch that is the best match but for a different
228 front end, or cl_options_count if there is no match at all. */
229 match_wrong_lang
= cl_options_count
;
231 /* Backtrace the chain of possible matches, returning the longest
232 one, if any, that fits best. With current GCC switches, this
233 loop executes at most twice. */
236 const struct cl_option
*opt
= &cl_options
[mn
];
238 /* Is this switch a prefix of the input? */
239 if (!strncmp (input
, opt
->opt_text
+ 1, opt
->opt_len
))
241 /* If language is OK, and the match is exact or the switch
242 takes a joined argument, return it. */
243 if ((opt
->flags
& lang_mask
)
244 && (input
[opt
->opt_len
] == '\0' || (opt
->flags
& CL_JOINED
)))
247 /* If we haven't remembered a prior match, remember this
248 one. Any prior match is necessarily better. */
249 if (match_wrong_lang
== cl_options_count
)
250 match_wrong_lang
= mn
;
253 /* Try the next possibility. This is cl_options_count if there
255 mn
= opt
->back_chain
;
257 while (mn
!= cl_options_count
);
259 /* Return the best wrong match, or cl_options_count if none. */
260 return match_wrong_lang
;
263 /* If ARG is a non-negative integer made up solely of digits, return its
264 value, otherwise return -1. */
266 integral_argument (const char *arg
)
270 while (*p
&& ISDIGIT (*p
))
279 /* Return a malloced slash-separated list of languages in MASK. */
281 write_langs (unsigned int mask
)
283 unsigned int n
= 0, len
= 0;
284 const char *lang_name
;
287 for (n
= 0; (lang_name
= lang_names
[n
]) != 0; n
++)
288 if (mask
& (1U << n
))
289 len
+= strlen (lang_name
) + 1;
291 result
= xmalloc (len
);
293 for (n
= 0; (lang_name
= lang_names
[n
]) != 0; n
++)
294 if (mask
& (1U << n
))
298 strcpy (result
+ len
, lang_name
);
299 len
+= strlen (lang_name
);
307 /* Complain that switch OPT_INDEX does not apply to this front end. */
309 complain_wrong_lang (const char *text
, const struct cl_option
*option
,
310 unsigned int lang_mask
)
312 char *ok_langs
, *bad_lang
;
314 ok_langs
= write_langs (option
->flags
);
315 bad_lang
= write_langs (lang_mask
);
317 /* Eventually this should become a hard error IMO. */
318 warning ("command line option \"%s\" is valid for %s but not for %s",
319 text
, ok_langs
, bad_lang
);
325 /* Handle the switch beginning at ARGV for the language indicated by
326 LANG_MASK. Returns the number of switches consumed. */
328 handle_option (const char **argv
, unsigned int lang_mask
)
331 const char *opt
, *arg
= 0;
334 unsigned int result
= 0;
335 const struct cl_option
*option
;
339 /* Drop the "no-" from negative switches. */
340 if ((opt
[1] == 'W' || opt
[1] == 'f')
341 && opt
[2] == 'n' && opt
[3] == 'o' && opt
[4] == '-')
343 size_t len
= strlen (opt
) - 3;
345 dup
= xmalloc (len
+ 1);
348 memcpy (dup
+ 2, opt
+ 5, len
- 2 + 1);
353 opt_index
= find_opt (opt
+ 1, lang_mask
| CL_COMMON
);
354 if (opt_index
== cl_options_count
)
357 option
= &cl_options
[opt_index
];
359 /* Reject negative form of switches that don't take negatives as
361 if (!value
&& (option
->flags
& CL_REJECT_NEGATIVE
))
364 /* We've recognized this switch. */
367 /* Sort out any argument the switch takes. */
368 if (option
->flags
& CL_JOINED
)
370 /* Have arg point to the original switch. This is because
371 some code, such as disable_builtin_function, expects its
372 argument to be persistent until the program exits. */
373 arg
= argv
[0] + cl_options
[opt_index
].opt_len
+ 1;
375 arg
+= strlen ("no-");
377 if (*arg
== '\0' && !(option
->flags
& CL_MISSING_OK
))
379 if (option
->flags
& CL_SEPARATE
)
385 /* Missing argument. */
389 else if (option
->flags
& CL_SEPARATE
)
395 /* Now we've swallowed any potential argument, complain if this
396 is a switch for a different front end. */
397 if (!(option
->flags
& (lang_mask
| CL_COMMON
)))
399 complain_wrong_lang (argv
[0], option
, lang_mask
);
403 if (arg
== NULL
&& (option
->flags
& (CL_JOINED
| CL_SEPARATE
)))
405 if (!(*lang_hooks
.missing_argument
) (opt
, opt_index
))
406 error ("missing argument to \"%s\"", opt
);
410 /* If the switch takes an integer, convert it. */
411 if (arg
&& (option
->flags
& CL_UINTEGER
))
413 value
= integral_argument (arg
);
416 error ("argument to \"%s\" should be a non-negative integer",
422 if (option
->flags
& lang_mask
)
423 if ((*lang_hooks
.handle_option
) (opt_index
, arg
, value
) == 0)
426 if (result
&& (option
->flags
& CL_COMMON
))
427 if (common_handle_option (opt_index
, arg
, value
) == 0)
436 /* Decode and handle the vector of command line options. LANG_MASK
437 contains has a single bit set representing the current
440 handle_options (unsigned int argc
, const char **argv
, unsigned int lang_mask
)
444 for (i
= 1; i
< argc
; i
+= n
)
446 const char *opt
= argv
[i
];
448 /* Interpret "-" or a non-switch as a file name. */
449 if (opt
[0] != '-' || opt
[1] == '\0')
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 /* Handle FILENAME from the command line. */
469 add_input_filename (const char *filename
)
472 in_fnames
= xrealloc (in_fnames
, num_in_fnames
* sizeof (in_fnames
[0]));
473 in_fnames
[num_in_fnames
- 1] = filename
;
476 /* Parse command line options and set default flag values. Do minimal
477 options processing. */
479 decode_options (unsigned int argc
, const char **argv
)
481 unsigned int i
, lang_mask
;
483 /* Perform language-specific options initialization. */
484 lang_mask
= (*lang_hooks
.init_options
) (argc
, argv
);
486 lang_hooks
.initialize_diagnostics (global_dc
);
488 /* Scan to see what optimization level has been specified. That will
489 determine the default value of many flags. */
490 for (i
= 1; i
< argc
; i
++)
492 if (!strcmp (argv
[i
], "-O"))
497 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'O')
499 /* Handle -Os, -O2, -O3, -O69, ... */
500 const char *p
= &argv
[i
][2];
502 if ((p
[0] == 's') && (p
[1] == 0))
506 /* Optimizing for size forces optimize to be 2. */
511 const int optimize_val
= read_integral_parameter (p
, p
- 2, -1);
512 if (optimize_val
!= -1)
514 optimize
= optimize_val
;
523 flag_merge_constants
= 0;
529 flag_thread_jumps
= 1;
531 flag_delayed_branch
= 1;
533 #ifdef CAN_DEBUG_WITHOUT_FP
534 flag_omit_frame_pointer
= 1;
536 flag_guess_branch_prob
= 1;
537 flag_cprop_registers
= 1;
538 flag_loop_optimize
= 1;
539 flag_if_conversion
= 1;
540 flag_if_conversion2
= 1;
545 flag_crossjumping
= 1;
546 flag_optimize_sibling_calls
= 1;
547 flag_cse_follow_jumps
= 1;
548 flag_cse_skip_blocks
= 1;
550 flag_expensive_optimizations
= 1;
551 flag_strength_reduce
= 1;
552 flag_rerun_cse_after_loop
= 1;
553 flag_rerun_loop_opt
= 1;
554 flag_caller_saves
= 1;
557 #ifdef INSN_SCHEDULING
558 flag_schedule_insns
= 1;
559 flag_schedule_insns_after_reload
= 1;
562 flag_strict_aliasing
= 1;
563 flag_delete_null_pointer_checks
= 1;
564 flag_reorder_blocks
= 1;
565 flag_reorder_functions
= 1;
566 flag_unit_at_a_time
= 1;
571 flag_inline_functions
= 1;
572 flag_rename_registers
= 1;
573 flag_unswitch_loops
= 1;
577 if (optimize
< 2 || optimize_size
)
584 /* Don't reorder blocks when optimizing for size because extra
585 jump insns may be created; also barrier may create extra padding.
587 More correctly we should have a block reordering mode that tried
588 to minimize the combined size of all the jumps. This would more
589 or less automatically remove extra jumps, but would also try to
590 use more short jumps instead of long jumps. */
591 flag_reorder_blocks
= 0;
594 /* Initialize whether `char' is signed. */
595 flag_signed_char
= DEFAULT_SIGNED_CHAR
;
596 #ifdef DEFAULT_SHORT_ENUMS
597 /* Initialize how much space enums occupy, by default. */
598 flag_short_enums
= DEFAULT_SHORT_ENUMS
;
601 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
604 set_target_switch ("");
606 /* Unwind tables are always present in an ABI-conformant IA-64
607 object file, so the default should be ON. */
608 #ifdef IA64_UNWIND_INFO
609 flag_unwind_tables
= IA64_UNWIND_INFO
;
612 #ifdef OPTIMIZATION_OPTIONS
613 /* Allow default optimizations to be specified on a per-machine basis. */
614 OPTIMIZATION_OPTIONS (optimize
, optimize_size
);
617 handle_options (argc
, argv
, lang_mask
);
621 if (flag_pic
&& !flag_pie
)
624 if (flag_no_inline
== 2)
627 flag_really_no_inline
= flag_no_inline
;
629 /* Set flag_no_inline before the post_options () hook. The C front
630 ends use it to determine tree inlining defaults. FIXME: such
631 code should be lang-independent when all front ends use tree
632 inlining, in which case it, and this condition, should be moved
633 to the top of process_options() instead. */
636 /* Inlining does not work if not optimizing,
637 so force it not to be done. */
641 /* The c_decode_option function and decode_option hook set
642 this to `2' if -Wall is used, so we can avoid giving out
643 lots of errors for people who don't realize what -Wall does. */
644 if (warn_uninitialized
== 1)
645 warning ("-Wuninitialized is not supported without -O");
648 if (flag_really_no_inline
== 2)
649 flag_really_no_inline
= flag_no_inline
;
652 /* Handle target- and language-independent options. Return zero to
653 generate an "unknown option" message. */
655 common_handle_option (size_t scode
, const char *arg
,
656 int value ATTRIBUTE_UNUSED
)
658 enum opt_code code
= (enum opt_code
) scode
;
667 exit_after_options
= true;
674 case OPT__target_help
:
675 display_target_options ();
676 exit_after_options
= true;
680 print_version (stderr
, "");
681 exit_after_options
= true;
685 g_switch_value
= value
;
691 /* Currently handled in a prescan. */
695 /* For backward compatibility, -W is the same as -Wextra. */
699 case OPT_Waggregate_return
:
700 warn_aggregate_return
= value
;
703 case OPT_Wcast_align
:
704 warn_cast_align
= value
;
707 case OPT_Wdeprecated_declarations
:
708 warn_deprecated_decl
= value
;
711 case OPT_Wdisabled_optimization
:
712 warn_disabled_optimization
= value
;
716 warnings_are_errors
= value
;
727 case OPT_Wlarger_than_
:
728 larger_than_size
= value
;
729 warn_larger_than
= value
!= -1;
732 case OPT_Wmissing_noreturn
:
733 warn_missing_noreturn
= value
;
748 case OPT_Wstrict_aliasing
:
749 warn_strict_aliasing
= value
;
756 case OPT_Wswitch_default
:
757 warn_switch_default
= value
;
760 case OPT_Wswitch_enum
:
761 warn_switch_enum
= value
;
764 case OPT_Wsystem_headers
:
765 warn_system_headers
= value
;
768 case OPT_Wuninitialized
:
769 warn_uninitialized
= value
;
772 case OPT_Wunreachable_code
:
773 warn_notreached
= value
;
780 case OPT_Wunused_function
:
781 warn_unused_function
= value
;
784 case OPT_Wunused_label
:
785 warn_unused_label
= value
;
788 case OPT_Wunused_parameter
:
789 warn_unused_parameter
= value
;
792 case OPT_Wunused_value
:
793 warn_unused_value
= value
;
796 case OPT_Wunused_variable
:
797 warn_unused_variable
= value
;
802 aux_info_file_name
= arg
;
803 flag_gen_aux_info
= 1;
810 case OPT_auxbase_strip
:
812 char *tmp
= xstrdup (arg
);
813 strip_off_ending (tmp
, strlen (tmp
));
820 decode_d_option (arg
);
824 dump_base_name
= arg
;
828 flag_pic
= value
+ value
;
832 flag_pie
= value
+ value
;
835 case OPT_falign_functions
:
836 align_functions
= !value
;
839 case OPT_falign_functions_
:
840 align_functions
= value
;
843 case OPT_falign_jumps
:
844 align_jumps
= !value
;
847 case OPT_falign_jumps_
:
851 case OPT_falign_labels
:
852 align_labels
= !value
;
855 case OPT_falign_labels_
:
856 align_labels
= value
;
859 case OPT_falign_loops
:
860 align_loops
= !value
;
863 case OPT_falign_loops_
:
867 case OPT_fargument_alias
:
868 flag_argument_noalias
= !value
;
871 case OPT_fargument_noalias
:
872 flag_argument_noalias
= value
;
875 case OPT_fargument_noalias_global
:
876 flag_argument_noalias
= value
+ value
;
879 case OPT_fasynchronous_unwind_tables
:
880 flag_asynchronous_unwind_tables
= value
;
883 case OPT_fbounds_check
:
884 flag_bounds_check
= value
;
887 case OPT_fbranch_count_reg
:
888 flag_branch_on_count_reg
= value
;
891 case OPT_fbranch_probabilities
:
892 flag_branch_probabilities_set
= true;
893 flag_branch_probabilities
= value
;
896 case OPT_fbranch_target_load_optimize
:
897 flag_branch_target_load_optimize
= value
;
900 case OPT_fbranch_target_load_optimize2
:
901 flag_branch_target_load_optimize2
= value
;
904 case OPT_fbtr_bb_exclusive
:
905 flag_btr_bb_exclusive
= value
;
908 case OPT_fcall_used_
:
909 fix_register (arg
, 0, 1);
912 case OPT_fcall_saved_
:
913 fix_register (arg
, 0, 0);
916 case OPT_fcaller_saves
:
917 flag_caller_saves
= value
;
921 flag_no_common
= !value
;
924 case OPT_fcprop_registers
:
925 flag_cprop_registers
= value
;
928 case OPT_fcrossjumping
:
929 flag_crossjumping
= value
;
932 case OPT_fcse_follow_jumps
:
933 flag_cse_follow_jumps
= value
;
936 case OPT_fcse_skip_blocks
:
937 flag_cse_skip_blocks
= value
;
940 case OPT_fdata_sections
:
941 flag_data_sections
= value
;
945 flag_defer_pop
= value
;
948 case OPT_fdelayed_branch
:
949 flag_delayed_branch
= value
;
952 case OPT_fdelete_null_pointer_checks
:
953 flag_delete_null_pointer_checks
= value
;
956 case OPT_fdiagnostics_show_location_
:
957 if (!strcmp (arg
, "once"))
958 diagnostic_prefixing_rule (global_dc
) = DIAGNOSTICS_SHOW_PREFIX_ONCE
;
959 else if (!strcmp (arg
, "every-line"))
960 diagnostic_prefixing_rule (global_dc
)
961 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE
;
966 case OPT_fdump_unnumbered
:
967 flag_dump_unnumbered
= value
;
970 case OPT_feliminate_dwarf2_dups
:
971 flag_eliminate_dwarf2_dups
= value
;
974 case OPT_feliminate_unused_debug_types
:
975 flag_eliminate_unused_debug_types
= value
;
978 case OPT_feliminate_unused_debug_symbols
:
979 flag_debug_only_used_symbols
= value
;
982 case OPT_fexceptions
:
983 flag_exceptions
= value
;
986 case OPT_fexpensive_optimizations
:
987 flag_expensive_optimizations
= value
;
991 set_fast_math_flags (value
);
994 case OPT_ffinite_math_only
:
995 flag_finite_math_only
= value
;
999 fix_register (arg
, 1, 1);
1002 case OPT_ffunction_cse
:
1003 flag_no_function_cse
= !value
;
1006 case OPT_ffloat_store
:
1007 flag_float_store
= value
;
1010 case OPT_fforce_addr
:
1011 flag_force_addr
= value
;
1014 case OPT_fforce_mem
:
1015 flag_force_mem
= value
;
1018 case OPT_ffunction_sections
:
1019 flag_function_sections
= value
;
1027 flag_gcse_lm
= value
;
1031 flag_gcse_sm
= value
;
1035 flag_gcse_las
= value
;
1038 case OPT_fguess_branch_probability
:
1039 flag_guess_branch_prob
= value
;
1043 flag_no_ident
= !value
;
1046 case OPT_fif_conversion
:
1047 flag_if_conversion
= value
;
1050 case OPT_fif_conversion2
:
1051 flag_if_conversion2
= value
;
1054 case OPT_finhibit_size_directive
:
1055 flag_inhibit_size_directive
= value
;
1059 flag_no_inline
= !value
;
1062 case OPT_finline_functions
:
1063 flag_inline_functions
= value
;
1066 case OPT_finline_limit_
:
1067 case OPT_finline_limit_eq
:
1068 set_param_value ("max-inline-insns-single", value
/ 2);
1069 set_param_value ("max-inline-insns-auto", value
/ 2);
1070 set_param_value ("max-inline-insns-rtl", value
);
1073 case OPT_finstrument_functions
:
1074 flag_instrument_function_entry_exit
= value
;
1077 case OPT_fkeep_inline_functions
:
1078 flag_keep_inline_functions
=value
;
1081 case OPT_fkeep_static_consts
:
1082 flag_keep_static_consts
= value
;
1085 case OPT_fleading_underscore
:
1086 flag_leading_underscore
= value
;
1089 case OPT_floop_optimize
:
1090 flag_loop_optimize
= value
;
1093 case OPT_fmath_errno
:
1094 flag_errno_math
= value
;
1097 case OPT_fmem_report
:
1101 case OPT_fmerge_all_constants
:
1102 flag_merge_constants
= value
+ value
;
1105 case OPT_fmerge_constants
:
1106 flag_merge_constants
= value
;
1109 case OPT_fmessage_length_
:
1110 pp_set_line_maximum_length (global_dc
->printer
, value
);
1113 case OPT_fmove_all_movables
:
1114 flag_move_all_movables
= value
;
1118 flag_new_regalloc
= value
;
1121 case OPT_fnon_call_exceptions
:
1122 flag_non_call_exceptions
= value
;
1125 case OPT_fold_unroll_all_loops
:
1126 flag_old_unroll_all_loops
= value
;
1129 case OPT_fold_unroll_loops
:
1130 flag_old_unroll_loops
= value
;
1133 case OPT_fomit_frame_pointer
:
1134 flag_omit_frame_pointer
= value
;
1137 case OPT_foptimize_register_move
:
1138 flag_regmove
= value
;
1141 case OPT_foptimize_sibling_calls
:
1142 flag_optimize_sibling_calls
= value
;
1145 case OPT_fpack_struct
:
1146 flag_pack_struct
= value
;
1149 case OPT_fpeel_loops
:
1150 flag_peel_loops_set
= true;
1151 flag_peel_loops
= value
;
1154 case OPT_fpcc_struct_return
:
1155 flag_pcc_struct_return
= value
;
1159 flag_no_peephole
= !value
;
1162 case OPT_fpeephole2
:
1163 flag_peephole2
= value
;
1174 case OPT_fprefetch_loop_arrays
:
1175 flag_prefetch_loop_arrays
= value
;
1179 profile_flag
= value
;
1182 case OPT_fprofile_arcs
:
1183 profile_arc_flag_set
= true;
1184 profile_arc_flag
= value
;
1187 case OPT_fprofile_use
:
1188 if (!flag_branch_probabilities_set
)
1189 flag_branch_probabilities
= value
;
1190 if (!flag_profile_values_set
)
1191 flag_profile_values
= value
;
1192 if (!flag_unroll_loops_set
)
1193 flag_unroll_loops
= value
;
1194 if (!flag_peel_loops_set
)
1195 flag_peel_loops
= value
;
1196 if (!flag_tracer_set
)
1197 flag_tracer
= value
;
1198 if (!flag_value_profile_transformations_set
)
1199 flag_value_profile_transformations
= value
;
1202 case OPT_fprofile_generate
:
1203 if (!profile_arc_flag_set
)
1204 profile_arc_flag
= value
;
1205 if (!flag_profile_values_set
)
1206 flag_profile_values
= value
;
1207 if (!flag_value_profile_transformations_set
)
1208 flag_value_profile_transformations
= value
;
1211 case OPT_fprofile_values
:
1212 flag_profile_values_set
= true;
1213 flag_profile_values
= value
;
1217 flag_value_profile_transformations_set
= value
;
1218 flag_value_profile_transformations
= value
;
1221 case OPT_frandom_seed
:
1222 /* The real switch is -fno-random-seed. */
1225 flag_random_seed
= NULL
;
1228 case OPT_frandom_seed_
:
1229 flag_random_seed
= arg
;
1232 case OPT_freduce_all_givs
:
1233 flag_reduce_all_givs
= value
;
1236 case OPT_freg_struct_return
:
1237 flag_pcc_struct_return
= !value
;
1241 flag_regmove
= value
;
1244 case OPT_frename_registers
:
1245 flag_rename_registers
= value
;
1248 case OPT_freorder_blocks
:
1249 flag_reorder_blocks
= value
;
1252 case OPT_freorder_functions
:
1253 flag_reorder_functions
= value
;
1256 case OPT_frerun_cse_after_loop
:
1257 flag_rerun_cse_after_loop
= value
;
1260 case OPT_frerun_loop_opt
:
1261 flag_rerun_loop_opt
= value
;
1264 case OPT_frounding_math
:
1265 flag_rounding_math
= value
;
1268 case OPT_fsched_interblock
:
1269 flag_schedule_interblock
= value
;
1272 case OPT_fsched_spec
:
1273 flag_schedule_speculative
= value
;
1276 case OPT_fsched_spec_load
:
1277 flag_schedule_speculative_load
= value
;
1280 case OPT_fsched_spec_load_dangerous
:
1281 flag_schedule_speculative_load_dangerous
= value
;
1284 case OPT_fsched_verbose_
:
1285 #ifdef INSN_SCHEDULING
1286 fix_sched_param ("verbose", arg
);
1292 case OPT_fsched2_use_superblocks
:
1293 flag_sched2_use_superblocks
= value
;
1296 case OPT_fsched2_use_traces
:
1297 flag_sched2_use_traces
= value
;
1300 case OPT_fschedule_insns
:
1301 flag_schedule_insns
= value
;
1304 case OPT_fschedule_insns2
:
1305 flag_schedule_insns_after_reload
= value
;
1308 case OPT_fsched_stalled_insns
:
1309 flag_sched_stalled_insns
= value
;
1312 case OPT_fsched_stalled_insns_
:
1313 flag_sched_stalled_insns
= value
;
1314 if (flag_sched_stalled_insns
== 0)
1315 flag_sched_stalled_insns
= -1;
1318 case OPT_fsched_stalled_insns_dep
:
1319 flag_sched_stalled_insns_dep
= 1;
1322 case OPT_fsched_stalled_insns_dep_
:
1323 flag_sched_stalled_insns_dep
= value
;
1326 case OPT_fshared_data
:
1327 flag_shared_data
= value
;
1330 case OPT_fsignaling_nans
:
1331 flag_signaling_nans
= value
;
1334 case OPT_fsingle_precision_constant
:
1335 flag_single_precision_constant
= value
;
1338 case OPT_fstack_check
:
1339 flag_stack_check
= value
;
1342 case OPT_fstack_limit
:
1343 /* The real switch is -fno-stack-limit. */
1346 stack_limit_rtx
= NULL_RTX
;
1349 case OPT_fstack_limit_register_
:
1351 int reg
= decode_reg_name (arg
);
1353 error ("unrecognized register name \"%s\"", arg
);
1355 stack_limit_rtx
= gen_rtx_REG (Pmode
, reg
);
1359 case OPT_fstack_limit_symbol_
:
1360 stack_limit_rtx
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (arg
));
1363 case OPT_fstrength_reduce
:
1364 flag_strength_reduce
= value
;
1367 case OPT_fstrict_aliasing
:
1368 flag_strict_aliasing
= value
;
1371 case OPT_fsyntax_only
:
1372 flag_syntax_only
= value
;
1375 case OPT_ftest_coverage
:
1376 flag_test_coverage
= value
;
1379 case OPT_fthread_jumps
:
1380 flag_thread_jumps
= value
;
1383 case OPT_ftime_report
:
1384 time_report
= value
;
1387 case OPT_ftls_model_
:
1388 if (!strcmp (arg
, "global-dynamic"))
1389 flag_tls_default
= TLS_MODEL_GLOBAL_DYNAMIC
;
1390 else if (!strcmp (arg
, "local-dynamic"))
1391 flag_tls_default
= TLS_MODEL_LOCAL_DYNAMIC
;
1392 else if (!strcmp (arg
, "initial-exec"))
1393 flag_tls_default
= TLS_MODEL_INITIAL_EXEC
;
1394 else if (!strcmp (arg
, "local-exec"))
1395 flag_tls_default
= TLS_MODEL_LOCAL_EXEC
;
1397 warning ("unknown tls-model \"%s\"", arg
);
1401 flag_tracer_set
= true;
1402 flag_tracer
= value
;
1405 case OPT_ftrapping_math
:
1406 flag_trapping_math
= value
;
1413 case OPT_funit_at_a_time
:
1414 flag_unit_at_a_time
= value
;
1417 case OPT_funroll_all_loops
:
1418 flag_unroll_all_loops
= value
;
1421 case OPT_funroll_loops
:
1422 flag_unroll_loops_set
= true;
1423 flag_unroll_loops
= value
;
1426 case OPT_funsafe_math_optimizations
:
1427 flag_unsafe_math_optimizations
= value
;
1430 case OPT_funswitch_loops
:
1431 flag_unswitch_loops
= value
;
1434 case OPT_funwind_tables
:
1435 flag_unwind_tables
= value
;
1438 case OPT_fverbose_asm
:
1439 flag_verbose_asm
= value
;
1450 case OPT_fwritable_strings
:
1451 flag_writable_strings
= value
;
1454 case OPT_fzero_initialized_in_bss
:
1455 flag_zero_initialized_in_bss
= value
;
1459 set_debug_level (NO_DEBUG
, DEFAULT_GDB_EXTENSIONS
, arg
);
1463 set_debug_level (SDB_DEBUG
, false, arg
);
1467 set_debug_level (DWARF2_DEBUG
, false, arg
);
1471 set_debug_level (NO_DEBUG
, 2, arg
);
1476 set_debug_level (DBX_DEBUG
, code
== OPT_gstabs_
, arg
);
1480 set_debug_level (VMS_DEBUG
, false, arg
);
1485 set_debug_level (XCOFF_DEBUG
, code
== OPT_gxcoff_
, arg
);
1489 set_target_switch (arg
);
1493 asm_file_name
= arg
;
1504 case OPT_pedantic_errors
:
1505 flag_pedantic_errors
= pedantic
= 1;
1517 inhibit_warnings
= true;
1524 /* Handle --param NAME=VALUE. */
1526 handle_param (const char *carg
)
1531 arg
= xstrdup (carg
);
1532 equal
= strchr (arg
, '=');
1534 error ("%s: --param arguments should be of the form NAME=VALUE", arg
);
1537 value
= integral_argument (equal
+ 1);
1539 error ("invalid --param value `%s'", equal
+ 1);
1543 set_param_value (arg
, value
);
1550 /* Handle -W and -Wextra. */
1552 set_Wextra (int setting
)
1554 extra_warnings
= setting
;
1555 warn_unused_value
= setting
;
1556 warn_unused_parameter
= (setting
&& maybe_warn_unused_parameter
);
1558 /* We save the value of warn_uninitialized, since if they put
1559 -Wuninitialized on the command line, we need to generate a
1560 warning about not using it without also specifying -O. */
1562 warn_uninitialized
= 0;
1563 else if (warn_uninitialized
!= 1)
1564 warn_uninitialized
= 2;
1567 /* Initialize unused warning flags. */
1569 set_Wunused (int setting
)
1571 warn_unused_function
= setting
;
1572 warn_unused_label
= setting
;
1573 /* Unused function parameter warnings are reported when either
1574 ``-Wextra -Wunused'' or ``-Wunused-parameter'' is specified.
1575 Thus, if -Wextra has already been seen, set warn_unused_parameter;
1576 otherwise set maybe_warn_extra_parameter, which will be picked up
1578 maybe_warn_unused_parameter
= setting
;
1579 warn_unused_parameter
= (setting
&& extra_warnings
);
1580 warn_unused_variable
= setting
;
1581 warn_unused_value
= setting
;
1584 /* The following routines are useful in setting all the flags that
1585 -ffast-math and -fno-fast-math imply. */
1587 set_fast_math_flags (int set
)
1589 flag_trapping_math
= !set
;
1590 flag_unsafe_math_optimizations
= set
;
1591 flag_finite_math_only
= set
;
1592 flag_errno_math
= !set
;
1595 flag_signaling_nans
= 0;
1596 flag_rounding_math
= 0;
1600 /* Return true iff flags are set as if -ffast-math. */
1602 fast_math_flags_set_p (void)
1604 return (!flag_trapping_math
1605 && flag_unsafe_math_optimizations
1606 && flag_finite_math_only
1607 && !flag_errno_math
);
1610 /* Handle a debug output -g switch. EXTENDED is true or false to support
1611 extended output (2 is special and means "-ggdb" was given). */
1613 set_debug_level (enum debug_info_type type
, int extended
, const char *arg
)
1615 static bool type_explicit
;
1617 use_gnu_debug_info_extensions
= extended
;
1619 if (type
== NO_DEBUG
)
1621 if (write_symbols
== NO_DEBUG
)
1623 write_symbols
= PREFERRED_DEBUGGING_TYPE
;
1627 #ifdef DWARF2_DEBUGGING_INFO
1628 write_symbols
= DWARF2_DEBUG
;
1629 #elif defined DBX_DEBUGGING_INFO
1630 write_symbols
= DBX_DEBUG
;
1634 if (write_symbols
== NO_DEBUG
)
1635 warning ("target system does not support debug output");
1640 /* Does it conflict with an already selected type? */
1641 if (type_explicit
&& write_symbols
!= NO_DEBUG
&& type
!= write_symbols
)
1642 error ("debug format \"%s\" conflicts with prior selection",
1643 debug_type_names
[type
]);
1644 write_symbols
= type
;
1645 type_explicit
= true;
1648 /* A debug flag without a level defaults to level 2. */
1651 if (!debug_info_level
)
1652 debug_info_level
= 2;
1656 debug_info_level
= integral_argument (arg
);
1657 if (debug_info_level
== (unsigned int) -1)
1658 error ("unrecognised debug output level \"%s\"", arg
);
1659 else if (debug_info_level
> 3)
1660 error ("debug output level %s is too high", arg
);
1664 /* Output --help text. */
1671 GET_ENVIRONMENT (p
, "COLUMNS");
1674 int value
= atoi (p
);
1679 puts (_("The following options are language-independent:\n"));
1681 print_filtered_help (CL_COMMON
);
1682 print_param_help ();
1684 for (i
= 0; lang_names
[i
]; i
++)
1686 printf (_("The %s front end recognizes the following options:\n\n"),
1688 print_filtered_help (1U << i
);
1691 display_target_options ();
1694 /* Print the help for --param. */
1696 print_param_help (void)
1700 puts (_("The --param option recognizes the following as parameters:\n"));
1702 for (i
= 0; i
< LAST_PARAM
; i
++)
1704 const char *help
= compiler_params
[i
].help
;
1705 const char *param
= compiler_params
[i
].option
;
1707 if (help
== NULL
|| *help
== '\0')
1708 help
= undocumented_msg
;
1710 /* Get the translation. */
1713 wrap_help (help
, param
, strlen (param
));
1719 /* Print help for a specific front-end, etc. */
1721 print_filtered_help (unsigned int flag
)
1723 unsigned int i
, len
, filter
, indent
= 0;
1724 bool duplicates
= false;
1725 const char *help
, *opt
, *tab
;
1726 static char *printed
;
1728 if (flag
== CL_COMMON
)
1732 printed
= xmalloc (cl_options_count
);
1733 memset (printed
, 0, cl_options_count
);
1737 /* Don't print COMMON options twice. */
1738 filter
= flag
| CL_COMMON
;
1740 for (i
= 0; i
< cl_options_count
; i
++)
1742 if ((cl_options
[i
].flags
& filter
) != flag
)
1745 /* Skip help for internal switches. */
1746 if (cl_options
[i
].flags
& CL_UNDOCUMENTED
)
1749 /* Skip switches that have already been printed, mark them to be
1754 indent
= print_switch (cl_options
[i
].opt_text
, indent
);
1765 for (i
= 0; i
< cl_options_count
; i
++)
1767 if ((cl_options
[i
].flags
& filter
) != flag
)
1770 /* Skip help for internal switches. */
1771 if (cl_options
[i
].flags
& CL_UNDOCUMENTED
)
1774 /* Skip switches that have already been printed. */
1780 help
= cl_options
[i
].help
;
1782 help
= undocumented_msg
;
1784 /* Get the translation. */
1787 tab
= strchr (help
, '\t');
1796 opt
= cl_options
[i
].opt_text
;
1800 wrap_help (help
, opt
, len
);
1806 /* Output ITEM, of length ITEM_WIDTH, in the left column, followed by
1807 word-wrapped HELP in a second column. */
1809 print_switch (const char *text
, unsigned int indent
)
1811 unsigned int len
= strlen (text
) + 1; /* trailing comma */
1816 if (indent
+ len
> columns
)
1827 fputs (text
, stdout
);
1829 return indent
+ len
+ 1;
1832 /* Output ITEM, of length ITEM_WIDTH, in the left column, followed by
1833 word-wrapped HELP in a second column. */
1835 wrap_help (const char *help
, const char *item
, unsigned int item_width
)
1837 unsigned int col_width
= 27;
1838 unsigned int remaining
, room
, len
;
1840 remaining
= strlen (help
);
1844 room
= columns
- 3 - MAX (col_width
, item_width
);
1853 for (i
= 0; help
[i
]; i
++)
1855 if (i
>= room
&& len
!= remaining
)
1859 else if ((help
[i
] == '-' || help
[i
] == '/')
1860 && help
[i
+ 1] != ' '
1861 && i
> 0 && ISALPHA (help
[i
- 1]))
1866 printf( " %-*.*s %.*s\n", col_width
, item_width
, item
, len
, help
);
1868 while (help
[len
] == ' ')