1 /* Command line option handling.
2 Copyright (C) 2002-2015 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 3, 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 COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
24 #include "coretypes.h"
29 #include "diagnostic.h"
30 #include "opts-diagnostic.h"
31 #include "insn-attr-common.h"
32 #include "common/common-target.h"
34 static void set_Wstrict_aliasing (struct gcc_options
*opts
, int onoff
);
36 /* Indexed by enum debug_info_type. */
37 const char *const debug_type_names
[] =
39 "none", "stabs", "coff", "dwarf-2", "xcoff", "vms"
42 /* Parse the -femit-struct-debug-detailed option value
43 and set the flag variables. */
45 #define MATCH( prefix, string ) \
46 ((strncmp (prefix, string, sizeof prefix - 1) == 0) \
47 ? ((string += sizeof prefix - 1), 1) : 0)
50 set_struct_debug_option (struct gcc_options
*opts
, location_t loc
,
53 /* various labels for comparison */
54 static const char dfn_lbl
[] = "dfn:", dir_lbl
[] = "dir:", ind_lbl
[] = "ind:";
55 static const char ord_lbl
[] = "ord:", gen_lbl
[] = "gen:";
56 static const char none_lbl
[] = "none", any_lbl
[] = "any";
57 static const char base_lbl
[] = "base", sys_lbl
[] = "sys";
59 enum debug_struct_file files
= DINFO_STRUCT_FILE_ANY
;
60 /* Default is to apply to as much as possible. */
61 enum debug_info_usage usage
= DINFO_USAGE_NUM_ENUMS
;
65 if (MATCH (dfn_lbl
, spec
))
66 usage
= DINFO_USAGE_DFN
;
67 else if (MATCH (dir_lbl
, spec
))
68 usage
= DINFO_USAGE_DIR_USE
;
69 else if (MATCH (ind_lbl
, spec
))
70 usage
= DINFO_USAGE_IND_USE
;
72 /* Generics or not? */
73 if (MATCH (ord_lbl
, spec
))
75 else if (MATCH (gen_lbl
, spec
))
78 /* What allowable environment? */
79 if (MATCH (none_lbl
, spec
))
80 files
= DINFO_STRUCT_FILE_NONE
;
81 else if (MATCH (any_lbl
, spec
))
82 files
= DINFO_STRUCT_FILE_ANY
;
83 else if (MATCH (sys_lbl
, spec
))
84 files
= DINFO_STRUCT_FILE_SYS
;
85 else if (MATCH (base_lbl
, spec
))
86 files
= DINFO_STRUCT_FILE_BASE
;
89 "argument %qs to %<-femit-struct-debug-detailed%> "
93 /* Effect the specification. */
94 if (usage
== DINFO_USAGE_NUM_ENUMS
)
98 opts
->x_debug_struct_ordinary
[DINFO_USAGE_DFN
] = files
;
99 opts
->x_debug_struct_ordinary
[DINFO_USAGE_DIR_USE
] = files
;
100 opts
->x_debug_struct_ordinary
[DINFO_USAGE_IND_USE
] = files
;
104 opts
->x_debug_struct_generic
[DINFO_USAGE_DFN
] = files
;
105 opts
->x_debug_struct_generic
[DINFO_USAGE_DIR_USE
] = files
;
106 opts
->x_debug_struct_generic
[DINFO_USAGE_IND_USE
] = files
;
112 opts
->x_debug_struct_ordinary
[usage
] = files
;
114 opts
->x_debug_struct_generic
[usage
] = files
;
118 set_struct_debug_option (opts
, loc
, spec
+1);
121 /* No more -femit-struct-debug-detailed specifications.
125 "argument %qs to %<-femit-struct-debug-detailed%> unknown",
127 if (opts
->x_debug_struct_ordinary
[DINFO_USAGE_DIR_USE
]
128 < opts
->x_debug_struct_ordinary
[DINFO_USAGE_IND_USE
]
129 || opts
->x_debug_struct_generic
[DINFO_USAGE_DIR_USE
]
130 < opts
->x_debug_struct_generic
[DINFO_USAGE_IND_USE
])
132 "%<-femit-struct-debug-detailed=dir:...%> must allow "
133 "at least as much as "
134 "%<-femit-struct-debug-detailed=ind:...%>");
138 /* Strip off a legitimate source ending from the input string NAME of
139 length LEN. Rather than having to know the names used by all of
140 our front ends, we strip off an ending of a period followed by
141 up to five characters. (Java uses ".class".) */
144 strip_off_ending (char *name
, int len
)
147 for (i
= 2; i
< 6 && len
> i
; i
++)
149 if (name
[len
- i
] == '.')
151 name
[len
- i
] = '\0';
157 /* Find the base name of a path, stripping off both directories and
158 a single final extension. */
160 base_of_path (const char *path
, const char **base_out
)
162 const char *base
= path
;
164 const char *p
= path
;
168 if (IS_DIR_SEPARATOR (c
))
183 /* What to print when a switch has no documentation. */
184 static const char undocumented_msg
[] = N_("This option lacks documentation.");
185 static const char use_diagnosed_msg
[] = N_("Uses of this option are diagnosed.");
187 typedef char *char_p
; /* For DEF_VEC_P. */
189 static void handle_param (struct gcc_options
*opts
,
190 struct gcc_options
*opts_set
, location_t loc
,
192 static void set_debug_level (enum debug_info_type type
, int extended
,
193 const char *arg
, struct gcc_options
*opts
,
194 struct gcc_options
*opts_set
,
196 static void set_fast_math_flags (struct gcc_options
*opts
, int set
);
197 static void decode_d_option (const char *arg
, struct gcc_options
*opts
,
198 location_t loc
, diagnostic_context
*dc
);
199 static void set_unsafe_math_optimizations_flags (struct gcc_options
*opts
,
201 static void enable_warning_as_error (const char *arg
, int value
,
202 unsigned int lang_mask
,
203 const struct cl_option_handlers
*handlers
,
204 struct gcc_options
*opts
,
205 struct gcc_options
*opts_set
,
207 diagnostic_context
*dc
);
209 /* Handle a back-end option; arguments and return value as for
213 target_handle_option (struct gcc_options
*opts
,
214 struct gcc_options
*opts_set
,
215 const struct cl_decoded_option
*decoded
,
216 unsigned int lang_mask ATTRIBUTE_UNUSED
, int kind
,
218 const struct cl_option_handlers
*handlers ATTRIBUTE_UNUSED
,
219 diagnostic_context
*dc
)
221 gcc_assert (dc
== global_dc
);
222 gcc_assert (kind
== DK_UNSPECIFIED
);
223 return targetm_common
.handle_option (opts
, opts_set
, decoded
, loc
);
226 /* Add comma-separated strings to a char_p vector. */
229 add_comma_separated_to_vector (void **pvec
, const char *arg
)
235 vec
<char_p
> *v
= (vec
<char_p
> *) *pvec
;
237 vec_check_alloc (v
, 1);
239 /* We never free this string. */
252 v
->safe_push (token_start
);
255 if (*r
== '\\' && r
[1] == ',')
263 if (*token_start
!= '\0')
264 v
->safe_push (token_start
);
269 /* Initialize opts_obstack if not initialized. */
272 init_opts_obstack (void)
274 static bool opts_obstack_initialized
= false;
276 if (!opts_obstack_initialized
)
278 opts_obstack_initialized
= true;
279 gcc_obstack_init (&opts_obstack
);
283 /* Initialize OPTS and OPTS_SET before using them in parsing options. */
286 init_options_struct (struct gcc_options
*opts
, struct gcc_options
*opts_set
)
288 size_t num_params
= get_num_compiler_params ();
290 init_opts_obstack ();
292 *opts
= global_options_init
;
295 memset (opts_set
, 0, sizeof (*opts_set
));
297 opts
->x_param_values
= XNEWVEC (int, num_params
);
300 opts_set
->x_param_values
= XCNEWVEC (int, num_params
);
302 init_param_values (opts
->x_param_values
);
304 /* Initialize whether `char' is signed. */
305 opts
->x_flag_signed_char
= DEFAULT_SIGNED_CHAR
;
306 /* Set this to a special "uninitialized" value. The actual default
307 is set after target options have been processed. */
308 opts
->x_flag_short_enums
= 2;
310 /* Initialize target_flags before default_options_optimization
311 so the latter can modify it. */
312 opts
->x_target_flags
= targetm_common
.default_target_flags
;
314 /* Some targets have ABI-specified unwind tables. */
315 opts
->x_flag_unwind_tables
= targetm_common
.unwind_tables_default
;
317 /* Some targets have other target-specific initialization. */
318 targetm_common
.option_init_struct (opts
);
321 /* Release any allocations owned by OPTS. */
324 finalize_options_struct (struct gcc_options
*opts
)
326 XDELETEVEC (opts
->x_param_values
);
329 /* If indicated by the optimization level LEVEL (-Os if SIZE is set,
330 -Ofast if FAST is set, -Og if DEBUG is set), apply the option DEFAULT_OPT
331 to OPTS and OPTS_SET, diagnostic context DC, location LOC, with language
332 mask LANG_MASK and option handlers HANDLERS. */
335 maybe_default_option (struct gcc_options
*opts
,
336 struct gcc_options
*opts_set
,
337 const struct default_options
*default_opt
,
338 int level
, bool size
, bool fast
, bool debug
,
339 unsigned int lang_mask
,
340 const struct cl_option_handlers
*handlers
,
342 diagnostic_context
*dc
)
344 const struct cl_option
*option
= &cl_options
[default_opt
->opt_index
];
348 gcc_assert (level
== 2);
350 gcc_assert (level
== 3);
352 gcc_assert (level
== 1);
354 switch (default_opt
->levels
)
360 case OPT_LEVELS_0_ONLY
:
361 enabled
= (level
== 0);
364 case OPT_LEVELS_1_PLUS
:
365 enabled
= (level
>= 1);
368 case OPT_LEVELS_1_PLUS_SPEED_ONLY
:
369 enabled
= (level
>= 1 && !size
&& !debug
);
372 case OPT_LEVELS_1_PLUS_NOT_DEBUG
:
373 enabled
= (level
>= 1 && !debug
);
376 case OPT_LEVELS_2_PLUS
:
377 enabled
= (level
>= 2);
380 case OPT_LEVELS_2_PLUS_SPEED_ONLY
:
381 enabled
= (level
>= 2 && !size
&& !debug
);
384 case OPT_LEVELS_3_PLUS
:
385 enabled
= (level
>= 3);
388 case OPT_LEVELS_3_PLUS_AND_SIZE
:
389 enabled
= (level
>= 3 || size
);
392 case OPT_LEVELS_SIZE
:
396 case OPT_LEVELS_FAST
:
400 case OPT_LEVELS_NONE
:
406 handle_generated_option (opts
, opts_set
, default_opt
->opt_index
,
407 default_opt
->arg
, default_opt
->value
,
408 lang_mask
, DK_UNSPECIFIED
, loc
,
410 else if (default_opt
->arg
== NULL
411 && !option
->cl_reject_negative
)
412 handle_generated_option (opts
, opts_set
, default_opt
->opt_index
,
413 default_opt
->arg
, !default_opt
->value
,
414 lang_mask
, DK_UNSPECIFIED
, loc
,
418 /* As indicated by the optimization level LEVEL (-Os if SIZE is set,
419 -Ofast if FAST is set), apply the options in array DEFAULT_OPTS to
420 OPTS and OPTS_SET, diagnostic context DC, location LOC, with
421 language mask LANG_MASK and option handlers HANDLERS. */
424 maybe_default_options (struct gcc_options
*opts
,
425 struct gcc_options
*opts_set
,
426 const struct default_options
*default_opts
,
427 int level
, bool size
, bool fast
, bool debug
,
428 unsigned int lang_mask
,
429 const struct cl_option_handlers
*handlers
,
431 diagnostic_context
*dc
)
435 for (i
= 0; default_opts
[i
].levels
!= OPT_LEVELS_NONE
; i
++)
436 maybe_default_option (opts
, opts_set
, &default_opts
[i
],
437 level
, size
, fast
, debug
,
438 lang_mask
, handlers
, loc
, dc
);
441 /* Table of options enabled by default at different levels. */
443 static const struct default_options default_options_table
[] =
445 /* -O1 optimizations. */
446 { OPT_LEVELS_1_PLUS
, OPT_fdefer_pop
, NULL
, 1 },
448 { OPT_LEVELS_1_PLUS
, OPT_fdelayed_branch
, NULL
, 1 },
450 { OPT_LEVELS_1_PLUS
, OPT_fguess_branch_probability
, NULL
, 1 },
451 { OPT_LEVELS_1_PLUS
, OPT_fcprop_registers
, NULL
, 1 },
452 { OPT_LEVELS_1_PLUS
, OPT_fforward_propagate
, NULL
, 1 },
453 { OPT_LEVELS_1_PLUS_NOT_DEBUG
, OPT_fif_conversion
, NULL
, 1 },
454 { OPT_LEVELS_1_PLUS_NOT_DEBUG
, OPT_fif_conversion2
, NULL
, 1 },
455 { OPT_LEVELS_1_PLUS
, OPT_fipa_pure_const
, NULL
, 1 },
456 { OPT_LEVELS_1_PLUS
, OPT_fipa_reference
, NULL
, 1 },
457 { OPT_LEVELS_1_PLUS
, OPT_fipa_profile
, NULL
, 1 },
458 { OPT_LEVELS_1_PLUS
, OPT_fmerge_constants
, NULL
, 1 },
459 { OPT_LEVELS_1_PLUS
, OPT_freorder_blocks
, NULL
, 1 },
460 { OPT_LEVELS_1_PLUS
, OPT_fshrink_wrap
, NULL
, 1 },
461 { OPT_LEVELS_1_PLUS
, OPT_fsplit_wide_types
, NULL
, 1 },
462 { OPT_LEVELS_1_PLUS
, OPT_ftree_ccp
, NULL
, 1 },
463 { OPT_LEVELS_1_PLUS_NOT_DEBUG
, OPT_ftree_bit_ccp
, NULL
, 1 },
464 { OPT_LEVELS_1_PLUS
, OPT_ftree_coalesce_vars
, NULL
, 1 },
465 { OPT_LEVELS_1_PLUS
, OPT_ftree_dce
, NULL
, 1 },
466 { OPT_LEVELS_1_PLUS
, OPT_ftree_dominator_opts
, NULL
, 1 },
467 { OPT_LEVELS_1_PLUS
, OPT_ftree_dse
, NULL
, 1 },
468 { OPT_LEVELS_1_PLUS
, OPT_ftree_ter
, NULL
, 1 },
469 { OPT_LEVELS_1_PLUS_NOT_DEBUG
, OPT_ftree_sra
, NULL
, 1 },
470 { OPT_LEVELS_1_PLUS
, OPT_ftree_fre
, NULL
, 1 },
471 { OPT_LEVELS_1_PLUS
, OPT_ftree_copy_prop
, NULL
, 1 },
472 { OPT_LEVELS_1_PLUS
, OPT_ftree_sink
, NULL
, 1 },
473 { OPT_LEVELS_1_PLUS
, OPT_ftree_ch
, NULL
, 1 },
474 { OPT_LEVELS_1_PLUS
, OPT_fcombine_stack_adjustments
, NULL
, 1 },
475 { OPT_LEVELS_1_PLUS
, OPT_fcompare_elim
, NULL
, 1 },
476 { OPT_LEVELS_1_PLUS
, OPT_ftree_slsr
, NULL
, 1 },
477 { OPT_LEVELS_1_PLUS_NOT_DEBUG
, OPT_fbranch_count_reg
, NULL
, 1 },
478 { OPT_LEVELS_1_PLUS_NOT_DEBUG
, OPT_fmove_loop_invariants
, NULL
, 1 },
479 { OPT_LEVELS_1_PLUS_NOT_DEBUG
, OPT_ftree_pta
, NULL
, 1 },
480 { OPT_LEVELS_1_PLUS_NOT_DEBUG
, OPT_fssa_phiopt
, NULL
, 1 },
481 { OPT_LEVELS_1_PLUS
, OPT_ftree_builtin_call_dce
, NULL
, 1 },
483 /* -O2 optimizations. */
484 { OPT_LEVELS_2_PLUS
, OPT_finline_small_functions
, NULL
, 1 },
485 { OPT_LEVELS_2_PLUS
, OPT_findirect_inlining
, NULL
, 1 },
486 { OPT_LEVELS_2_PLUS
, OPT_fpartial_inlining
, NULL
, 1 },
487 { OPT_LEVELS_2_PLUS
, OPT_fthread_jumps
, NULL
, 1 },
488 { OPT_LEVELS_2_PLUS
, OPT_fcrossjumping
, NULL
, 1 },
489 { OPT_LEVELS_2_PLUS
, OPT_foptimize_sibling_calls
, NULL
, 1 },
490 { OPT_LEVELS_2_PLUS
, OPT_fcse_follow_jumps
, NULL
, 1 },
491 { OPT_LEVELS_2_PLUS
, OPT_fgcse
, NULL
, 1 },
492 { OPT_LEVELS_2_PLUS
, OPT_fexpensive_optimizations
, NULL
, 1 },
493 { OPT_LEVELS_2_PLUS
, OPT_frerun_cse_after_loop
, NULL
, 1 },
494 { OPT_LEVELS_2_PLUS
, OPT_fcaller_saves
, NULL
, 1 },
495 { OPT_LEVELS_2_PLUS
, OPT_fpeephole2
, NULL
, 1 },
496 #ifdef INSN_SCHEDULING
497 /* Only run the pre-regalloc scheduling pass if optimizing for speed. */
498 { OPT_LEVELS_2_PLUS_SPEED_ONLY
, OPT_fschedule_insns
, NULL
, 1 },
499 { OPT_LEVELS_2_PLUS
, OPT_fschedule_insns2
, NULL
, 1 },
501 { OPT_LEVELS_2_PLUS
, OPT_fstrict_aliasing
, NULL
, 1 },
502 { OPT_LEVELS_2_PLUS
, OPT_fstrict_overflow
, NULL
, 1 },
503 { OPT_LEVELS_2_PLUS_SPEED_ONLY
, OPT_freorder_blocks_algorithm_
, NULL
,
504 REORDER_BLOCKS_ALGORITHM_STC
},
505 { OPT_LEVELS_2_PLUS
, OPT_freorder_functions
, NULL
, 1 },
506 { OPT_LEVELS_2_PLUS
, OPT_ftree_vrp
, NULL
, 1 },
507 { OPT_LEVELS_2_PLUS
, OPT_ftree_pre
, NULL
, 1 },
508 { OPT_LEVELS_2_PLUS
, OPT_ftree_switch_conversion
, NULL
, 1 },
509 { OPT_LEVELS_2_PLUS
, OPT_fipa_cp
, NULL
, 1 },
510 { OPT_LEVELS_2_PLUS
, OPT_fipa_cp_alignment
, NULL
, 1 },
511 { OPT_LEVELS_2_PLUS
, OPT_fdevirtualize
, NULL
, 1 },
512 { OPT_LEVELS_2_PLUS
, OPT_fdevirtualize_speculatively
, NULL
, 1 },
513 { OPT_LEVELS_2_PLUS
, OPT_fipa_sra
, NULL
, 1 },
514 { OPT_LEVELS_2_PLUS
, OPT_falign_loops
, NULL
, 1 },
515 { OPT_LEVELS_2_PLUS
, OPT_falign_jumps
, NULL
, 1 },
516 { OPT_LEVELS_2_PLUS
, OPT_falign_labels
, NULL
, 1 },
517 { OPT_LEVELS_2_PLUS
, OPT_falign_functions
, NULL
, 1 },
518 { OPT_LEVELS_2_PLUS
, OPT_ftree_tail_merge
, NULL
, 1 },
519 { OPT_LEVELS_2_PLUS
, OPT_fvect_cost_model_
, NULL
, VECT_COST_MODEL_CHEAP
},
520 { OPT_LEVELS_2_PLUS_SPEED_ONLY
, OPT_foptimize_strlen
, NULL
, 1 },
521 { OPT_LEVELS_2_PLUS
, OPT_fhoist_adjacent_loads
, NULL
, 1 },
522 { OPT_LEVELS_2_PLUS
, OPT_fipa_icf
, NULL
, 1 },
523 { OPT_LEVELS_2_PLUS
, OPT_fisolate_erroneous_paths_dereference
, NULL
, 1 },
524 { OPT_LEVELS_2_PLUS
, OPT_fipa_ra
, NULL
, 1 },
525 { OPT_LEVELS_2_PLUS
, OPT_flra_remat
, NULL
, 1 },
526 { OPT_LEVELS_2_PLUS
, OPT_fsplit_paths
, NULL
, 1 },
528 /* -O3 optimizations. */
529 { OPT_LEVELS_3_PLUS
, OPT_ftree_loop_distribute_patterns
, NULL
, 1 },
530 { OPT_LEVELS_3_PLUS
, OPT_fpredictive_commoning
, NULL
, 1 },
531 /* Inlining of functions reducing size is a good idea with -Os
532 regardless of them being declared inline. */
533 { OPT_LEVELS_3_PLUS_AND_SIZE
, OPT_finline_functions
, NULL
, 1 },
534 { OPT_LEVELS_1_PLUS_NOT_DEBUG
, OPT_finline_functions_called_once
, NULL
, 1 },
535 { OPT_LEVELS_3_PLUS
, OPT_funswitch_loops
, NULL
, 1 },
536 { OPT_LEVELS_3_PLUS
, OPT_fgcse_after_reload
, NULL
, 1 },
537 { OPT_LEVELS_3_PLUS
, OPT_ftree_loop_vectorize
, NULL
, 1 },
538 { OPT_LEVELS_3_PLUS
, OPT_ftree_slp_vectorize
, NULL
, 1 },
539 { OPT_LEVELS_3_PLUS
, OPT_fvect_cost_model_
, NULL
, VECT_COST_MODEL_DYNAMIC
},
540 { OPT_LEVELS_3_PLUS
, OPT_fipa_cp_clone
, NULL
, 1 },
541 { OPT_LEVELS_3_PLUS
, OPT_ftree_partial_pre
, NULL
, 1 },
543 /* -Ofast adds optimizations to -O3. */
544 { OPT_LEVELS_FAST
, OPT_ffast_math
, NULL
, 1 },
546 { OPT_LEVELS_NONE
, 0, NULL
, 0 }
549 /* Default the options in OPTS and OPTS_SET based on the optimization
550 settings in DECODED_OPTIONS and DECODED_OPTIONS_COUNT. */
552 default_options_optimization (struct gcc_options
*opts
,
553 struct gcc_options
*opts_set
,
554 struct cl_decoded_option
*decoded_options
,
555 unsigned int decoded_options_count
,
557 unsigned int lang_mask
,
558 const struct cl_option_handlers
*handlers
,
559 diagnostic_context
*dc
)
564 /* Scan to see what optimization level has been specified. That will
565 determine the default value of many flags. */
566 for (i
= 1; i
< decoded_options_count
; i
++)
568 struct cl_decoded_option
*opt
= &decoded_options
[i
];
569 switch (opt
->opt_index
)
572 if (*opt
->arg
== '\0')
574 opts
->x_optimize
= 1;
575 opts
->x_optimize_size
= 0;
576 opts
->x_optimize_fast
= 0;
577 opts
->x_optimize_debug
= 0;
581 const int optimize_val
= integral_argument (opt
->arg
);
582 if (optimize_val
== -1)
583 error_at (loc
, "argument to %<-O%> should be a non-negative "
584 "integer, %<g%>, %<s%> or %<fast%>");
587 opts
->x_optimize
= optimize_val
;
588 if ((unsigned int) opts
->x_optimize
> 255)
589 opts
->x_optimize
= 255;
590 opts
->x_optimize_size
= 0;
591 opts
->x_optimize_fast
= 0;
592 opts
->x_optimize_debug
= 0;
598 opts
->x_optimize_size
= 1;
600 /* Optimizing for size forces optimize to be 2. */
601 opts
->x_optimize
= 2;
602 opts
->x_optimize_fast
= 0;
603 opts
->x_optimize_debug
= 0;
607 /* -Ofast only adds flags to -O3. */
608 opts
->x_optimize_size
= 0;
609 opts
->x_optimize
= 3;
610 opts
->x_optimize_fast
= 1;
611 opts
->x_optimize_debug
= 0;
615 /* -Og selects optimization level 1. */
616 opts
->x_optimize_size
= 0;
617 opts
->x_optimize
= 1;
618 opts
->x_optimize_fast
= 0;
619 opts
->x_optimize_debug
= 1;
623 /* Ignore other options in this prescan. */
628 maybe_default_options (opts
, opts_set
, default_options_table
,
629 opts
->x_optimize
, opts
->x_optimize_size
,
630 opts
->x_optimize_fast
, opts
->x_optimize_debug
,
631 lang_mask
, handlers
, loc
, dc
);
633 /* -O2 param settings. */
634 opt2
= (opts
->x_optimize
>= 2);
636 /* Track fields in field-sensitive alias analysis. */
637 maybe_set_param_value
638 (PARAM_MAX_FIELDS_FOR_FIELD_SENSITIVE
,
639 opt2
? 100 : default_param_value (PARAM_MAX_FIELDS_FOR_FIELD_SENSITIVE
),
640 opts
->x_param_values
, opts_set
->x_param_values
);
642 /* For -O1 only do loop invariant motion for very small loops. */
643 maybe_set_param_value
644 (PARAM_LOOP_INVARIANT_MAX_BBS_IN_LOOP
,
645 opt2
? default_param_value (PARAM_LOOP_INVARIANT_MAX_BBS_IN_LOOP
) : 1000,
646 opts
->x_param_values
, opts_set
->x_param_values
);
648 /* At -Ofast, allow store motion to introduce potential race conditions. */
649 maybe_set_param_value
650 (PARAM_ALLOW_STORE_DATA_RACES
,
651 opts
->x_optimize_fast
? 1
652 : default_param_value (PARAM_ALLOW_STORE_DATA_RACES
),
653 opts
->x_param_values
, opts_set
->x_param_values
);
655 if (opts
->x_optimize_size
)
656 /* We want to crossjump as much as possible. */
657 maybe_set_param_value (PARAM_MIN_CROSSJUMP_INSNS
, 1,
658 opts
->x_param_values
, opts_set
->x_param_values
);
660 maybe_set_param_value (PARAM_MIN_CROSSJUMP_INSNS
,
661 default_param_value (PARAM_MIN_CROSSJUMP_INSNS
),
662 opts
->x_param_values
, opts_set
->x_param_values
);
664 /* Restrict the amount of work combine does at -Og while retaining
665 most of its useful transforms. */
666 if (opts
->x_optimize_debug
)
667 maybe_set_param_value (PARAM_MAX_COMBINE_INSNS
, 2,
668 opts
->x_param_values
, opts_set
->x_param_values
);
670 /* Allow default optimizations to be specified on a per-machine basis. */
671 maybe_default_options (opts
, opts_set
,
672 targetm_common
.option_optimization_table
,
673 opts
->x_optimize
, opts
->x_optimize_size
,
674 opts
->x_optimize_fast
, opts
->x_optimize_debug
,
675 lang_mask
, handlers
, loc
, dc
);
678 /* After all options at LOC have been read into OPTS and OPTS_SET,
679 finalize settings of those options and diagnose incompatible
682 finish_options (struct gcc_options
*opts
, struct gcc_options
*opts_set
,
685 enum unwind_info_type ui_except
;
687 if (opts
->x_dump_base_name
688 && ! IS_ABSOLUTE_PATH (opts
->x_dump_base_name
)
689 && ! opts
->x_dump_base_name_prefixed
)
691 /* First try to make OPTS->X_DUMP_BASE_NAME relative to the
692 OPTS->X_DUMP_DIR_NAME directory. Then try to make
693 OPTS->X_DUMP_BASE_NAME relative to the OPTS->X_AUX_BASE_NAME
694 directory, typically the directory to contain the object
696 if (opts
->x_dump_dir_name
)
697 opts
->x_dump_base_name
= opts_concat (opts
->x_dump_dir_name
,
698 opts
->x_dump_base_name
, NULL
);
699 else if (opts
->x_aux_base_name
700 && strcmp (opts
->x_aux_base_name
, HOST_BIT_BUCKET
) != 0)
702 const char *aux_base
;
704 base_of_path (opts
->x_aux_base_name
, &aux_base
);
705 if (opts
->x_aux_base_name
!= aux_base
)
707 int dir_len
= aux_base
- opts
->x_aux_base_name
;
708 char *new_dump_base_name
709 = XOBNEWVEC (&opts_obstack
, char,
710 strlen (opts
->x_dump_base_name
) + dir_len
+ 1);
712 /* Copy directory component from OPTS->X_AUX_BASE_NAME. */
713 memcpy (new_dump_base_name
, opts
->x_aux_base_name
, dir_len
);
714 /* Append existing OPTS->X_DUMP_BASE_NAME. */
715 strcpy (new_dump_base_name
+ dir_len
, opts
->x_dump_base_name
);
716 opts
->x_dump_base_name
= new_dump_base_name
;
719 opts
->x_dump_base_name_prefixed
= true;
722 /* Handle related options for unit-at-a-time, toplevel-reorder, and
724 if (!opts
->x_flag_unit_at_a_time
)
726 if (opts
->x_flag_section_anchors
&& opts_set
->x_flag_section_anchors
)
727 error_at (loc
, "section anchors must be disabled when unit-at-a-time "
729 opts
->x_flag_section_anchors
= 0;
730 if (opts
->x_flag_toplevel_reorder
== 1)
731 error_at (loc
, "toplevel reorder must be disabled when unit-at-a-time "
733 opts
->x_flag_toplevel_reorder
= 0;
736 if (opts
->x_flag_tm
&& opts
->x_flag_non_call_exceptions
)
737 sorry ("transactional memory is not supported with non-call exceptions");
739 /* Unless the user has asked for section anchors, we disable toplevel
740 reordering at -O0 to disable transformations that might be surprising
741 to end users and to get -fno-toplevel-reorder tested. */
742 if (!opts
->x_optimize
743 && opts
->x_flag_toplevel_reorder
== 2
744 && !(opts
->x_flag_section_anchors
&& opts_set
->x_flag_section_anchors
))
746 opts
->x_flag_toplevel_reorder
= 0;
747 opts
->x_flag_section_anchors
= 0;
749 if (!opts
->x_flag_toplevel_reorder
)
751 if (opts
->x_flag_section_anchors
&& opts_set
->x_flag_section_anchors
)
752 error_at (loc
, "section anchors must be disabled when toplevel reorder"
754 opts
->x_flag_section_anchors
= 0;
757 if (!opts
->x_flag_opts_finished
)
759 /* We initialize opts->x_flag_pie to -1 so that targets can set a
761 if (opts
->x_flag_pie
== -1)
763 if (opts
->x_flag_pic
== 0)
764 opts
->x_flag_pie
= DEFAULT_FLAG_PIE
;
766 opts
->x_flag_pie
= 0;
768 if (opts
->x_flag_pie
)
769 opts
->x_flag_pic
= opts
->x_flag_pie
;
770 if (opts
->x_flag_pic
&& !opts
->x_flag_pie
)
771 opts
->x_flag_shlib
= 1;
772 opts
->x_flag_opts_finished
= true;
775 /* We initialize opts->x_flag_stack_protect to -1 so that targets
776 can set a default value. */
777 if (opts
->x_flag_stack_protect
== -1)
778 opts
->x_flag_stack_protect
= DEFAULT_FLAG_SSP
;
780 if (opts
->x_optimize
== 0)
782 /* Inlining does not work if not optimizing,
783 so force it not to be done. */
784 opts
->x_warn_inline
= 0;
785 opts
->x_flag_no_inline
= 1;
788 /* The optimization to partition hot and cold basic blocks into separate
789 sections of the .o and executable files does not work (currently)
790 with exception handling. This is because there is no support for
791 generating unwind info. If opts->x_flag_exceptions is turned on
792 we need to turn off the partitioning optimization. */
794 ui_except
= targetm_common
.except_unwind_info (opts
);
796 if (opts
->x_flag_exceptions
797 && opts
->x_flag_reorder_blocks_and_partition
798 && (ui_except
== UI_SJLJ
|| ui_except
>= UI_TARGET
))
800 if (opts_set
->x_flag_reorder_blocks_and_partition
)
802 "-freorder-blocks-and-partition does not work "
803 "with exceptions on this architecture");
804 opts
->x_flag_reorder_blocks_and_partition
= 0;
805 opts
->x_flag_reorder_blocks
= 1;
808 /* If user requested unwind info, then turn off the partitioning
811 if (opts
->x_flag_unwind_tables
812 && !targetm_common
.unwind_tables_default
813 && opts
->x_flag_reorder_blocks_and_partition
814 && (ui_except
== UI_SJLJ
|| ui_except
>= UI_TARGET
))
816 if (opts_set
->x_flag_reorder_blocks_and_partition
)
818 "-freorder-blocks-and-partition does not support "
819 "unwind info on this architecture");
820 opts
->x_flag_reorder_blocks_and_partition
= 0;
821 opts
->x_flag_reorder_blocks
= 1;
824 /* If the target requested unwind info, then turn off the partitioning
825 optimization with a different message. Likewise, if the target does not
826 support named sections. */
828 if (opts
->x_flag_reorder_blocks_and_partition
829 && (!targetm_common
.have_named_sections
830 || (opts
->x_flag_unwind_tables
831 && targetm_common
.unwind_tables_default
832 && (ui_except
== UI_SJLJ
|| ui_except
>= UI_TARGET
))))
834 if (opts_set
->x_flag_reorder_blocks_and_partition
)
836 "-freorder-blocks-and-partition does not work "
837 "on this architecture");
838 opts
->x_flag_reorder_blocks_and_partition
= 0;
839 opts
->x_flag_reorder_blocks
= 1;
842 /* Disable -freorder-blocks-and-partition when -fprofile-use is not in
843 effect. Function splitting was not actually being performed in that case,
844 as probably_never_executed_bb_p does not distinguish any basic blocks as
845 being cold vs hot when there is no profile data. Leaving it enabled,
846 however, causes the assembly code generator to create (empty) cold
847 sections and labels, leading to unnecessary size overhead. */
848 if (opts
->x_flag_reorder_blocks_and_partition
849 && !opts_set
->x_flag_profile_use
)
850 opts
->x_flag_reorder_blocks_and_partition
= 0;
852 if (opts
->x_flag_reorder_blocks_and_partition
853 && !opts_set
->x_flag_reorder_functions
)
854 opts
->x_flag_reorder_functions
= 1;
856 /* Pipelining of outer loops is only possible when general pipelining
857 capabilities are requested. */
858 if (!opts
->x_flag_sel_sched_pipelining
)
859 opts
->x_flag_sel_sched_pipelining_outer_loops
= 0;
861 if (opts
->x_flag_conserve_stack
)
863 maybe_set_param_value (PARAM_LARGE_STACK_FRAME
, 100,
864 opts
->x_param_values
, opts_set
->x_param_values
);
865 maybe_set_param_value (PARAM_STACK_FRAME_GROWTH
, 40,
866 opts
->x_param_values
, opts_set
->x_param_values
);
869 if (opts
->x_flag_lto
)
872 opts
->x_flag_generate_lto
= 1;
874 /* When generating IL, do not operate in whole-program mode.
875 Otherwise, symbols will be privatized too early, causing link
877 opts
->x_flag_whole_program
= 0;
879 error_at (loc
, "LTO support has not been enabled in this configuration");
881 if (!opts
->x_flag_fat_lto_objects
883 || (opts_set
->x_flag_use_linker_plugin
884 && !opts
->x_flag_use_linker_plugin
)))
886 if (opts_set
->x_flag_fat_lto_objects
)
887 error_at (loc
, "-fno-fat-lto-objects are supported only with linker plugin");
888 opts
->x_flag_fat_lto_objects
= 1;
892 /* We initialize opts->x_flag_split_stack to -1 so that targets can set a
893 default value if they choose based on other options. */
894 if (opts
->x_flag_split_stack
== -1)
895 opts
->x_flag_split_stack
= 0;
896 else if (opts
->x_flag_split_stack
)
898 if (!targetm_common
.supports_split_stack (true, opts
))
900 error_at (loc
, "%<-fsplit-stack%> is not supported by "
901 "this compiler configuration");
902 opts
->x_flag_split_stack
= 0;
906 /* Tune vectorization related parametees according to cost model. */
907 if (opts
->x_flag_vect_cost_model
== VECT_COST_MODEL_CHEAP
)
909 maybe_set_param_value (PARAM_VECT_MAX_VERSION_FOR_ALIAS_CHECKS
,
910 6, opts
->x_param_values
, opts_set
->x_param_values
);
911 maybe_set_param_value (PARAM_VECT_MAX_VERSION_FOR_ALIGNMENT_CHECKS
,
912 0, opts
->x_param_values
, opts_set
->x_param_values
);
913 maybe_set_param_value (PARAM_VECT_MAX_PEELING_FOR_ALIGNMENT
,
914 0, opts
->x_param_values
, opts_set
->x_param_values
);
917 /* Set PARAM_MAX_STORES_TO_SINK to 0 if either vectorization or if-conversion
919 if ((!opts
->x_flag_tree_loop_vectorize
&& !opts
->x_flag_tree_slp_vectorize
)
920 || !opts
->x_flag_tree_loop_if_convert
)
921 maybe_set_param_value (PARAM_MAX_STORES_TO_SINK
, 0,
922 opts
->x_param_values
, opts_set
->x_param_values
);
924 /* The -gsplit-dwarf option requires -ggnu-pubnames. */
925 if (opts
->x_dwarf_split_debug_info
)
926 opts
->x_debug_generate_pub_sections
= 2;
928 /* Userspace and kernel ASan conflict with each other. */
930 if ((opts
->x_flag_sanitize
& SANITIZE_USER_ADDRESS
)
931 && (opts
->x_flag_sanitize
& SANITIZE_KERNEL_ADDRESS
))
933 "-fsanitize=address is incompatible with "
934 "-fsanitize=kernel-address");
938 if ((opts
->x_flag_sanitize
& SANITIZE_ADDRESS
)
939 && (opts
->x_flag_sanitize
& SANITIZE_THREAD
))
941 "-fsanitize=address and -fsanitize=kernel-address "
942 "are incompatible with -fsanitize=thread");
944 /* Error recovery is not allowed for LSan and TSan. */
946 if (opts
->x_flag_sanitize_recover
& SANITIZE_THREAD
)
947 error_at (loc
, "-fsanitize-recover=thread is not supported");
949 if (opts
->x_flag_sanitize_recover
& SANITIZE_LEAK
)
950 error_at (loc
, "-fsanitize-recover=leak is not supported");
952 /* When instrumenting the pointers, we don't want to remove
953 the null pointer checks. */
954 if (opts
->x_flag_sanitize
& (SANITIZE_NULL
| SANITIZE_NONNULL_ATTRIBUTE
955 | SANITIZE_RETURNS_NONNULL_ATTRIBUTE
))
956 opts
->x_flag_delete_null_pointer_checks
= 0;
958 /* Aggressive compiler optimizations may cause false negatives. */
959 if (opts
->x_flag_sanitize
)
961 opts
->x_flag_aggressive_loop_optimizations
= 0;
962 opts
->x_flag_strict_overflow
= 0;
966 #define LEFT_COLUMN 27
968 /* Output ITEM, of length ITEM_WIDTH, in the left column,
969 followed by word-wrapped HELP in a second column. */
971 wrap_help (const char *help
,
973 unsigned int item_width
,
974 unsigned int columns
)
976 unsigned int col_width
= LEFT_COLUMN
;
977 unsigned int remaining
, room
, len
;
979 remaining
= strlen (help
);
983 room
= columns
- 3 - MAX (col_width
, item_width
);
992 for (i
= 0; help
[i
]; i
++)
994 if (i
>= room
&& len
!= remaining
)
998 else if ((help
[i
] == '-' || help
[i
] == '/')
999 && help
[i
+ 1] != ' '
1000 && i
> 0 && ISALPHA (help
[i
- 1]))
1005 printf (" %-*.*s %.*s\n", col_width
, item_width
, item
, len
, help
);
1007 while (help
[len
] == ' ')
1015 /* Print help for a specific front-end, etc. */
1017 print_filtered_help (unsigned int include_flags
,
1018 unsigned int exclude_flags
,
1019 unsigned int any_flags
,
1020 unsigned int columns
,
1021 struct gcc_options
*opts
,
1022 unsigned int lang_mask
)
1027 bool displayed
= false;
1030 if (include_flags
== CL_PARAMS
)
1032 for (i
= 0; i
< LAST_PARAM
; i
++)
1034 const char *param
= compiler_params
[i
].option
;
1036 help
= compiler_params
[i
].help
;
1037 if (help
== NULL
|| *help
== '\0')
1039 if (exclude_flags
& CL_UNDOCUMENTED
)
1041 help
= undocumented_msg
;
1044 /* Get the translation. */
1047 if (!opts
->x_quiet_flag
)
1049 snprintf (new_help
, sizeof (new_help
),
1050 _("default %d minimum %d maximum %d"),
1051 compiler_params
[i
].default_value
,
1052 compiler_params
[i
].min_value
,
1053 compiler_params
[i
].max_value
);
1056 wrap_help (help
, param
, strlen (param
), columns
);
1062 if (!opts
->x_help_printed
)
1063 opts
->x_help_printed
= XCNEWVAR (char, cl_options_count
);
1065 if (!opts
->x_help_enum_printed
)
1066 opts
->x_help_enum_printed
= XCNEWVAR (char, cl_enums_count
);
1068 for (i
= 0; i
< cl_options_count
; i
++)
1070 const struct cl_option
*option
= cl_options
+ i
;
1075 if (include_flags
== 0
1076 || ((option
->flags
& include_flags
) != include_flags
))
1078 if ((option
->flags
& any_flags
) == 0)
1082 /* Skip unwanted switches. */
1083 if ((option
->flags
& exclude_flags
) != 0)
1086 /* The driver currently prints its own help text. */
1087 if ((option
->flags
& CL_DRIVER
) != 0
1088 && (option
->flags
& (((1U << cl_lang_count
) - 1)
1089 | CL_COMMON
| CL_TARGET
)) == 0)
1093 /* Skip switches that have already been printed. */
1094 if (opts
->x_help_printed
[i
])
1097 opts
->x_help_printed
[i
] = true;
1099 help
= option
->help
;
1102 if (exclude_flags
& CL_UNDOCUMENTED
)
1105 help
= undocumented_msg
;
1108 if (option
->alias_target
< N_OPTS
1109 && cl_options
[option
->alias_target
].help
)
1111 if (help
== undocumented_msg
)
1113 /* For undocumented options that are aliases for other options
1114 that are documented, point the reader to the other option in
1115 preference of the former. */
1116 snprintf (new_help
, sizeof new_help
,
1117 _("Same as %s. Use the latter option instead."),
1118 cl_options
[option
->alias_target
].opt_text
);
1122 /* For documented options with aliases, mention the aliased
1123 option's name for reference. */
1124 snprintf (new_help
, sizeof new_help
,
1125 _("%s Same as %s."),
1126 help
, cl_options
[option
->alias_target
].opt_text
);
1132 if (option
->warn_message
)
1134 /* Mention that the use of the option will trigger a warning. */
1135 if (help
== new_help
)
1136 snprintf (new_help
+ strlen (new_help
),
1137 sizeof new_help
- strlen (new_help
),
1138 " %s", _(use_diagnosed_msg
));
1140 snprintf (new_help
, sizeof new_help
,
1141 "%s %s", help
, _(use_diagnosed_msg
));
1146 /* Get the translation. */
1149 /* Find the gap between the name of the
1150 option and its descriptive text. */
1151 tab
= strchr (help
, '\t');
1160 opt
= option
->opt_text
;
1164 /* With the -Q option enabled we change the descriptive text associated
1165 with an option to be an indication of its current setting. */
1166 if (!opts
->x_quiet_flag
)
1168 void *flag_var
= option_flag_var (i
, opts
);
1170 if (len
< (LEFT_COLUMN
+ 2))
1171 strcpy (new_help
, "\t\t");
1173 strcpy (new_help
, "\t");
1175 if (flag_var
!= NULL
1176 && option
->var_type
!= CLVC_DEFER
)
1178 if (option
->flags
& CL_JOINED
)
1180 if (option
->var_type
== CLVC_STRING
)
1182 if (* (const char **) flag_var
!= NULL
)
1183 snprintf (new_help
+ strlen (new_help
),
1184 sizeof (new_help
) - strlen (new_help
),
1185 "%s", * (const char **) flag_var
);
1187 else if (option
->var_type
== CLVC_ENUM
)
1189 const struct cl_enum
*e
= &cl_enums
[option
->var_enum
];
1191 const char *arg
= NULL
;
1193 value
= e
->get (flag_var
);
1194 enum_value_to_arg (e
->values
, &arg
, value
, lang_mask
);
1196 arg
= _("[default]");
1197 snprintf (new_help
+ strlen (new_help
),
1198 sizeof (new_help
) - strlen (new_help
),
1202 sprintf (new_help
+ strlen (new_help
),
1203 "%#x", * (int *) flag_var
);
1206 strcat (new_help
, option_enabled (i
, opts
)
1207 ? _("[enabled]") : _("[disabled]"));
1213 wrap_help (help
, opt
, len
, columns
);
1216 if (option
->var_type
== CLVC_ENUM
1217 && opts
->x_help_enum_printed
[option
->var_enum
] != 2)
1218 opts
->x_help_enum_printed
[option
->var_enum
] = 1;
1223 unsigned int langs
= include_flags
& CL_LANG_ALL
;
1226 printf (_(" No options with the desired characteristics were found\n"));
1231 /* PR 31349: Tell the user how to see all of the
1232 options supported by a specific front end. */
1233 for (i
= 0; (1U << i
) < CL_LANG_ALL
; i
++)
1234 if ((1U << i
) & langs
)
1235 printf (_(" None found. Use --help=%s to show *all* the options supported by the %s front-end.\n"),
1236 lang_names
[i
], lang_names
[i
]);
1240 else if (! displayed
)
1241 printf (_(" All options with the desired characteristics have already been displayed\n"));
1245 /* Print details of enumerated option arguments, if those
1246 enumerations have help text headings provided. If no help text
1247 is provided, presume that the possible values are listed in the
1248 help text for the relevant options. */
1249 for (i
= 0; i
< cl_enums_count
; i
++)
1251 unsigned int j
, pos
;
1253 if (opts
->x_help_enum_printed
[i
] != 1)
1255 if (cl_enums
[i
].help
== NULL
)
1257 printf (" %s\n ", _(cl_enums
[i
].help
));
1259 for (j
= 0; cl_enums
[i
].values
[j
].arg
!= NULL
; j
++)
1261 unsigned int len
= strlen (cl_enums
[i
].values
[j
].arg
);
1263 if (pos
> 4 && pos
+ 1 + len
<= columns
)
1265 printf (" %s", cl_enums
[i
].values
[j
].arg
);
1275 printf ("%s", cl_enums
[i
].values
[j
].arg
);
1280 opts
->x_help_enum_printed
[i
] = 2;
1284 /* Display help for a specified type of option.
1285 The options must have ALL of the INCLUDE_FLAGS set
1286 ANY of the flags in the ANY_FLAGS set
1287 and NONE of the EXCLUDE_FLAGS set. The current option state is in
1288 OPTS; LANG_MASK is used for interpreting enumerated option state. */
1290 print_specific_help (unsigned int include_flags
,
1291 unsigned int exclude_flags
,
1292 unsigned int any_flags
,
1293 struct gcc_options
*opts
,
1294 unsigned int lang_mask
)
1296 unsigned int all_langs_mask
= (1U << cl_lang_count
) - 1;
1297 const char * description
= NULL
;
1298 const char * descrip_extra
= "";
1302 /* Sanity check: Make sure that we do not have more
1303 languages than we have bits available to enumerate them. */
1304 gcc_assert ((1U << cl_lang_count
) <= CL_MIN_OPTION_CLASS
);
1306 /* If we have not done so already, obtain
1307 the desired maximum width of the output. */
1308 if (opts
->x_help_columns
== 0)
1310 opts
->x_help_columns
= get_terminal_width ();
1311 if (opts
->x_help_columns
== INT_MAX
)
1312 /* Use a reasonable default. */
1313 opts
->x_help_columns
= 80;
1316 /* Decide upon the title for the options that we are going to display. */
1317 for (i
= 0, flag
= 1; flag
<= CL_MAX_OPTION_CLASS
; flag
<<= 1, i
++)
1319 switch (flag
& include_flags
)
1326 description
= _("The following options are target specific");
1329 description
= _("The following options control compiler warning messages");
1331 case CL_OPTIMIZATION
:
1332 description
= _("The following options control optimizations");
1335 description
= _("The following options are language-independent");
1338 description
= _("The --param option recognizes the following as parameters");
1341 if (i
>= cl_lang_count
)
1343 if (exclude_flags
& all_langs_mask
)
1344 description
= _("The following options are specific to just the language ");
1346 description
= _("The following options are supported by the language ");
1347 descrip_extra
= lang_names
[i
];
1352 if (description
== NULL
)
1356 if (include_flags
& CL_UNDOCUMENTED
)
1357 description
= _("The following options are not documented");
1358 else if (include_flags
& CL_SEPARATE
)
1359 description
= _("The following options take separate arguments");
1360 else if (include_flags
& CL_JOINED
)
1361 description
= _("The following options take joined arguments");
1364 internal_error ("unrecognized include_flags 0x%x passed to print_specific_help",
1371 if (any_flags
& all_langs_mask
)
1372 description
= _("The following options are language-related");
1374 description
= _("The following options are language-independent");
1378 printf ("%s%s:\n", description
, descrip_extra
);
1379 print_filtered_help (include_flags
, exclude_flags
, any_flags
,
1380 opts
->x_help_columns
, opts
, lang_mask
);
1383 /* Enable FDO-related flags. */
1386 enable_fdo_optimizations (struct gcc_options
*opts
,
1387 struct gcc_options
*opts_set
,
1390 if (!opts_set
->x_flag_branch_probabilities
)
1391 opts
->x_flag_branch_probabilities
= value
;
1392 if (!opts_set
->x_flag_profile_values
)
1393 opts
->x_flag_profile_values
= value
;
1394 if (!opts_set
->x_flag_unroll_loops
)
1395 opts
->x_flag_unroll_loops
= value
;
1396 if (!opts_set
->x_flag_peel_loops
)
1397 opts
->x_flag_peel_loops
= value
;
1398 if (!opts_set
->x_flag_tracer
)
1399 opts
->x_flag_tracer
= value
;
1400 if (!opts_set
->x_flag_value_profile_transformations
)
1401 opts
->x_flag_value_profile_transformations
= value
;
1402 if (!opts_set
->x_flag_inline_functions
)
1403 opts
->x_flag_inline_functions
= value
;
1404 if (!opts_set
->x_flag_ipa_cp
)
1405 opts
->x_flag_ipa_cp
= value
;
1406 if (!opts_set
->x_flag_ipa_cp_clone
1407 && value
&& opts
->x_flag_ipa_cp
)
1408 opts
->x_flag_ipa_cp_clone
= value
;
1409 if (!opts_set
->x_flag_ipa_cp_alignment
1410 && value
&& opts
->x_flag_ipa_cp
)
1411 opts
->x_flag_ipa_cp_alignment
= value
;
1412 if (!opts_set
->x_flag_predictive_commoning
)
1413 opts
->x_flag_predictive_commoning
= value
;
1414 if (!opts_set
->x_flag_unswitch_loops
)
1415 opts
->x_flag_unswitch_loops
= value
;
1416 if (!opts_set
->x_flag_gcse_after_reload
)
1417 opts
->x_flag_gcse_after_reload
= value
;
1418 if (!opts_set
->x_flag_tree_loop_vectorize
1419 && !opts_set
->x_flag_tree_vectorize
)
1420 opts
->x_flag_tree_loop_vectorize
= value
;
1421 if (!opts_set
->x_flag_tree_slp_vectorize
1422 && !opts_set
->x_flag_tree_vectorize
)
1423 opts
->x_flag_tree_slp_vectorize
= value
;
1424 if (!opts_set
->x_flag_vect_cost_model
)
1425 opts
->x_flag_vect_cost_model
= VECT_COST_MODEL_DYNAMIC
;
1426 if (!opts_set
->x_flag_tree_loop_distribute_patterns
)
1427 opts
->x_flag_tree_loop_distribute_patterns
= value
;
1430 /* Handle target- and language-independent options. Return zero to
1431 generate an "unknown option" message. Only options that need
1432 extra handling need to be listed here; if you simply want
1433 DECODED->value assigned to a variable, it happens automatically. */
1436 common_handle_option (struct gcc_options
*opts
,
1437 struct gcc_options
*opts_set
,
1438 const struct cl_decoded_option
*decoded
,
1439 unsigned int lang_mask
, int kind ATTRIBUTE_UNUSED
,
1441 const struct cl_option_handlers
*handlers
,
1442 diagnostic_context
*dc
)
1444 size_t scode
= decoded
->opt_index
;
1445 const char *arg
= decoded
->arg
;
1446 int value
= decoded
->value
;
1447 enum opt_code code
= (enum opt_code
) scode
;
1449 gcc_assert (decoded
->canonical_option_num_elements
<= 2);
1454 handle_param (opts
, opts_set
, loc
, arg
);
1459 unsigned int all_langs_mask
= (1U << cl_lang_count
) - 1;
1460 unsigned int undoc_mask
;
1463 if (lang_mask
== CL_DRIVER
)
1466 undoc_mask
= ((opts
->x_verbose_flag
| opts
->x_extra_warnings
)
1469 /* First display any single language specific options. */
1470 for (i
= 0; i
< cl_lang_count
; i
++)
1472 (1U << i
, (all_langs_mask
& (~ (1U << i
))) | undoc_mask
, 0, opts
,
1474 /* Next display any multi language specific options. */
1475 print_specific_help (0, undoc_mask
, all_langs_mask
, opts
, lang_mask
);
1476 /* Then display any remaining, non-language options. */
1477 for (i
= CL_MIN_OPTION_CLASS
; i
<= CL_MAX_OPTION_CLASS
; i
<<= 1)
1479 print_specific_help (i
, undoc_mask
, 0, opts
, lang_mask
);
1480 opts
->x_exit_after_options
= true;
1484 case OPT__target_help
:
1485 if (lang_mask
== CL_DRIVER
)
1488 print_specific_help (CL_TARGET
, CL_UNDOCUMENTED
, 0, opts
, lang_mask
);
1489 opts
->x_exit_after_options
= true;
1494 const char * a
= arg
;
1495 unsigned int include_flags
= 0;
1496 /* Note - by default we include undocumented options when listing
1497 specific classes. If you only want to see documented options
1498 then add ",^undocumented" to the --help= option. E.g.:
1500 --help=target,^undocumented */
1501 unsigned int exclude_flags
= 0;
1503 if (lang_mask
== CL_DRIVER
)
1506 /* Walk along the argument string, parsing each word in turn.
1508 arg = [^]{word}[,{arg}]
1509 word = {optimizers|target|warnings|undocumented|
1510 params|common|<language>} */
1515 const char * string
;
1520 { "optimizers", CL_OPTIMIZATION
},
1521 { "target", CL_TARGET
},
1522 { "warnings", CL_WARNING
},
1523 { "undocumented", CL_UNDOCUMENTED
},
1524 { "params", CL_PARAMS
},
1525 { "joined", CL_JOINED
},
1526 { "separate", CL_SEPARATE
},
1527 { "common", CL_COMMON
},
1530 unsigned int * pflags
;
1532 unsigned int lang_flag
, specific_flag
;
1539 pflags
= & exclude_flags
;
1542 pflags
= & include_flags
;
1544 comma
= strchr (a
, ',');
1555 /* Check to see if the string matches an option class name. */
1556 for (i
= 0, specific_flag
= 0; specifics
[i
].string
!= NULL
; i
++)
1557 if (strncasecmp (a
, specifics
[i
].string
, len
) == 0)
1559 specific_flag
= specifics
[i
].flag
;
1563 /* Check to see if the string matches a language name.
1564 Note - we rely upon the alpha-sorted nature of the entries in
1565 the lang_names array, specifically that shorter names appear
1566 before their longer variants. (i.e. C before C++). That way
1567 when we are attempting to match --help=c for example we will
1568 match with C first and not C++. */
1569 for (i
= 0, lang_flag
= 0; i
< cl_lang_count
; i
++)
1570 if (strncasecmp (a
, lang_names
[i
], len
) == 0)
1572 lang_flag
= 1U << i
;
1576 if (specific_flag
!= 0)
1579 * pflags
|= specific_flag
;
1582 /* The option's argument matches both the start of a
1583 language name and the start of an option class name.
1584 We have a special case for when the user has
1585 specified "--help=c", but otherwise we have to issue
1587 if (strncasecmp (a
, "c", len
) == 0)
1588 * pflags
|= lang_flag
;
1591 "--help argument %q.*s is ambiguous, "
1592 "please be more specific",
1596 else if (lang_flag
!= 0)
1597 * pflags
|= lang_flag
;
1600 "unrecognized argument to --help= option: %q.*s",
1609 print_specific_help (include_flags
, exclude_flags
, 0, opts
,
1611 opts
->x_exit_after_options
= true;
1616 if (lang_mask
== CL_DRIVER
)
1619 opts
->x_exit_after_options
= true;
1622 case OPT_fsanitize_
:
1623 case OPT_fsanitize_recover_
:
1625 const char *p
= arg
;
1627 = code
== OPT_fsanitize_
? &opts
->x_flag_sanitize
1628 : &opts
->x_flag_sanitize_recover
;
1633 const char *const name
;
1638 { "address", SANITIZE_ADDRESS
| SANITIZE_USER_ADDRESS
,
1639 sizeof "address" - 1 },
1640 { "kernel-address", SANITIZE_ADDRESS
| SANITIZE_KERNEL_ADDRESS
,
1641 sizeof "kernel-address" - 1 },
1642 { "thread", SANITIZE_THREAD
, sizeof "thread" - 1 },
1643 { "leak", SANITIZE_LEAK
, sizeof "leak" - 1 },
1644 { "shift", SANITIZE_SHIFT
, sizeof "shift" - 1 },
1645 { "integer-divide-by-zero", SANITIZE_DIVIDE
,
1646 sizeof "integer-divide-by-zero" - 1 },
1647 { "undefined", SANITIZE_UNDEFINED
, sizeof "undefined" - 1 },
1648 { "unreachable", SANITIZE_UNREACHABLE
,
1649 sizeof "unreachable" - 1 },
1650 { "vla-bound", SANITIZE_VLA
, sizeof "vla-bound" - 1 },
1651 { "return", SANITIZE_RETURN
, sizeof "return" - 1 },
1652 { "null", SANITIZE_NULL
, sizeof "null" - 1 },
1653 { "signed-integer-overflow", SANITIZE_SI_OVERFLOW
,
1654 sizeof "signed-integer-overflow" -1 },
1655 { "bool", SANITIZE_BOOL
, sizeof "bool" - 1 },
1656 { "enum", SANITIZE_ENUM
, sizeof "enum" - 1 },
1657 { "float-divide-by-zero", SANITIZE_FLOAT_DIVIDE
,
1658 sizeof "float-divide-by-zero" - 1 },
1659 { "float-cast-overflow", SANITIZE_FLOAT_CAST
,
1660 sizeof "float-cast-overflow" - 1 },
1661 { "bounds", SANITIZE_BOUNDS
, sizeof "bounds" - 1 },
1662 { "bounds-strict", SANITIZE_BOUNDS
| SANITIZE_BOUNDS_STRICT
,
1663 sizeof "bounds-strict" - 1 },
1664 { "alignment", SANITIZE_ALIGNMENT
, sizeof "alignment" - 1 },
1665 { "nonnull-attribute", SANITIZE_NONNULL_ATTRIBUTE
,
1666 sizeof "nonnull-attribute" - 1 },
1667 { "returns-nonnull-attribute",
1668 SANITIZE_RETURNS_NONNULL_ATTRIBUTE
,
1669 sizeof "returns-nonnull-attribute" - 1 },
1670 { "object-size", SANITIZE_OBJECT_SIZE
,
1671 sizeof "object-size" - 1 },
1672 { "vptr", SANITIZE_VPTR
, sizeof "vptr" - 1 },
1673 { "all", ~0, sizeof "all" - 1 },
1680 comma
= strchr (p
, ',');
1691 /* Check to see if the string matches an option class name. */
1692 for (i
= 0; spec
[i
].name
!= NULL
; ++i
)
1693 if (len
== spec
[i
].len
1694 && memcmp (p
, spec
[i
].name
, len
) == 0)
1696 /* Handle both -fsanitize and -fno-sanitize cases. */
1697 if (value
&& spec
[i
].flag
== ~0U)
1699 if (code
== OPT_fsanitize_
)
1700 error_at (loc
, "-fsanitize=all option is not valid");
1702 *flag
|= ~(SANITIZE_USER_ADDRESS
| SANITIZE_THREAD
1706 *flag
|= spec
[i
].flag
;
1708 *flag
&= ~spec
[i
].flag
;
1715 "unrecognized argument to -fsanitize%s= option: %q.*s",
1716 code
== OPT_fsanitize_
? "" : "-recover", (int) len
, p
);
1723 if (code
!= OPT_fsanitize_
)
1726 /* Kernel ASan implies normal ASan but does not yet support
1728 if (opts
->x_flag_sanitize
& SANITIZE_KERNEL_ADDRESS
)
1730 maybe_set_param_value (PARAM_ASAN_INSTRUMENTATION_WITH_CALL_THRESHOLD
, 0,
1731 opts
->x_param_values
,
1732 opts_set
->x_param_values
);
1733 maybe_set_param_value (PARAM_ASAN_GLOBALS
, 0,
1734 opts
->x_param_values
,
1735 opts_set
->x_param_values
);
1736 maybe_set_param_value (PARAM_ASAN_STACK
, 0,
1737 opts
->x_param_values
,
1738 opts_set
->x_param_values
);
1739 maybe_set_param_value (PARAM_ASAN_USE_AFTER_RETURN
, 0,
1740 opts
->x_param_values
,
1741 opts_set
->x_param_values
);
1747 case OPT_fasan_shadow_offset_
:
1751 case OPT_fsanitize_recover
:
1753 opts
->x_flag_sanitize_recover
1754 |= SANITIZE_UNDEFINED
| SANITIZE_NONDEFAULT
;
1756 opts
->x_flag_sanitize_recover
1757 &= ~(SANITIZE_UNDEFINED
| SANITIZE_NONDEFAULT
);
1764 /* Currently handled in a prescan. */
1768 dc
->warning_as_error_requested
= value
;
1772 if (lang_mask
== CL_DRIVER
)
1775 enable_warning_as_error (arg
, value
, lang_mask
, handlers
,
1776 opts
, opts_set
, loc
, dc
);
1779 case OPT_Wlarger_than_
:
1780 opts
->x_larger_than_size
= value
;
1781 opts
->x_warn_larger_than
= value
!= -1;
1784 case OPT_Wfatal_errors
:
1785 dc
->fatal_errors
= value
;
1788 case OPT_Wframe_larger_than_
:
1789 opts
->x_frame_larger_than_size
= value
;
1790 opts
->x_warn_frame_larger_than
= value
!= -1;
1793 case OPT_Wstack_usage_
:
1794 opts
->x_warn_stack_usage
= value
;
1795 opts
->x_flag_stack_usage_info
= value
!= -1;
1798 case OPT_Wstrict_aliasing
:
1799 set_Wstrict_aliasing (opts
, value
);
1802 case OPT_Wstrict_overflow
:
1803 opts
->x_warn_strict_overflow
= (value
1804 ? (int) WARN_STRICT_OVERFLOW_CONDITIONAL
1808 case OPT_Wsystem_headers
:
1809 dc
->dc_warn_system_headers
= value
;
1813 opts
->x_flag_gen_aux_info
= 1;
1816 case OPT_auxbase_strip
:
1818 char *tmp
= xstrdup (arg
);
1819 strip_off_ending (tmp
, strlen (tmp
));
1821 opts
->x_aux_base_name
= tmp
;
1828 decode_d_option (arg
, opts
, loc
, dc
);
1831 case OPT_fcall_used_
:
1832 case OPT_fcall_saved_
:
1840 case OPT_fdbg_cnt_list
:
1842 opts
->x_exit_after_options
= true;
1845 case OPT_fdebug_prefix_map_
:
1849 case OPT_fdiagnostics_show_location_
:
1850 diagnostic_prefixing_rule (dc
) = (diagnostic_prefixing_rule_t
) value
;
1853 case OPT_fdiagnostics_show_caret
:
1854 dc
->show_caret
= value
;
1857 case OPT_fdiagnostics_color_
:
1858 diagnostic_color_init (dc
, value
);
1861 case OPT_fdiagnostics_show_option
:
1862 dc
->show_option_requested
= value
;
1869 case OPT_ffast_math
:
1870 set_fast_math_flags (opts
, value
);
1873 case OPT_funsafe_math_optimizations
:
1874 set_unsafe_math_optimizations_flags (opts
, value
);
1881 case OPT_finline_limit_
:
1882 set_param_value ("max-inline-insns-single", value
/ 2,
1883 opts
->x_param_values
, opts_set
->x_param_values
);
1884 set_param_value ("max-inline-insns-auto", value
/ 2,
1885 opts
->x_param_values
, opts_set
->x_param_values
);
1888 case OPT_finstrument_functions_exclude_function_list_
:
1889 add_comma_separated_to_vector
1890 (&opts
->x_flag_instrument_functions_exclude_functions
, arg
);
1893 case OPT_finstrument_functions_exclude_file_list_
:
1894 add_comma_separated_to_vector
1895 (&opts
->x_flag_instrument_functions_exclude_files
, arg
);
1898 case OPT_fmessage_length_
:
1899 pp_set_line_maximum_length (dc
->printer
, value
);
1900 diagnostic_set_caret_max_width (dc
, value
);
1904 case OPT_fopt_info_
:
1912 #ifndef ACCEL_COMPILER
1913 case OPT_foffload_abi_
:
1914 error_at (loc
, "-foffload-abi option can be specified only for "
1915 "offload compiler");
1919 case OPT_fpack_struct_
:
1920 if (value
<= 0 || (value
& (value
- 1)) || value
> 16)
1922 "structure alignment must be a small power of two, not %d",
1925 opts
->x_initial_max_fld_align
= value
;
1929 case OPT_fplugin_arg_
:
1933 case OPT_fprofile_use_
:
1934 opts
->x_profile_data_prefix
= xstrdup (arg
);
1935 opts
->x_flag_profile_use
= true;
1937 /* No break here - do -fprofile-use processing. */
1938 case OPT_fprofile_use
:
1939 enable_fdo_optimizations (opts
, opts_set
, value
);
1940 if (!opts_set
->x_flag_profile_reorder_functions
)
1941 opts
->x_flag_profile_reorder_functions
= value
;
1942 /* Indirect call profiling should do all useful transformations
1943 speculative devirtualization does. */
1944 if (!opts_set
->x_flag_devirtualize_speculatively
1945 && opts
->x_flag_value_profile_transformations
)
1946 opts
->x_flag_devirtualize_speculatively
= false;
1949 case OPT_fauto_profile_
:
1950 opts
->x_auto_profile_file
= xstrdup (arg
);
1951 opts
->x_flag_auto_profile
= true;
1953 /* No break here - do -fauto-profile processing. */
1954 case OPT_fauto_profile
:
1955 enable_fdo_optimizations (opts
, opts_set
, value
);
1956 if (!opts_set
->x_flag_profile_correction
)
1957 opts
->x_flag_profile_correction
= value
;
1958 maybe_set_param_value (
1959 PARAM_EARLY_INLINER_MAX_ITERATIONS
, 10,
1960 opts
->x_param_values
, opts_set
->x_param_values
);
1963 case OPT_fprofile_generate_
:
1964 opts
->x_profile_data_prefix
= xstrdup (arg
);
1966 /* No break here - do -fprofile-generate processing. */
1967 case OPT_fprofile_generate
:
1968 if (!opts_set
->x_profile_arc_flag
)
1969 opts
->x_profile_arc_flag
= value
;
1970 if (!opts_set
->x_flag_profile_values
)
1971 opts
->x_flag_profile_values
= value
;
1972 if (!opts_set
->x_flag_inline_functions
)
1973 opts
->x_flag_inline_functions
= value
;
1974 /* FIXME: Instrumentation we insert makes ipa-reference bitmaps
1975 quadratic. Disable the pass until better memory representation
1977 if (!opts_set
->x_flag_ipa_reference
)
1978 opts
->x_flag_ipa_reference
= false;
1981 case OPT_ftree_vectorize
:
1982 if (!opts_set
->x_flag_tree_loop_vectorize
)
1983 opts
->x_flag_tree_loop_vectorize
= value
;
1984 if (!opts_set
->x_flag_tree_slp_vectorize
)
1985 opts
->x_flag_tree_slp_vectorize
= value
;
1987 case OPT_fshow_column
:
1988 dc
->show_column
= value
;
1991 case OPT_frandom_seed
:
1992 /* The real switch is -fno-random-seed. */
1998 case OPT_frandom_seed_
:
2002 case OPT_fsched_verbose_
:
2003 #ifdef INSN_SCHEDULING
2004 /* Handled with Var in common.opt. */
2010 case OPT_fsched_stalled_insns_
:
2011 opts
->x_flag_sched_stalled_insns
= value
;
2012 if (opts
->x_flag_sched_stalled_insns
== 0)
2013 opts
->x_flag_sched_stalled_insns
= -1;
2016 case OPT_fsched_stalled_insns_dep_
:
2017 opts
->x_flag_sched_stalled_insns_dep
= value
;
2020 case OPT_fstack_check_
:
2021 if (!strcmp (arg
, "no"))
2022 opts
->x_flag_stack_check
= NO_STACK_CHECK
;
2023 else if (!strcmp (arg
, "generic"))
2024 /* This is the old stack checking method. */
2025 opts
->x_flag_stack_check
= STACK_CHECK_BUILTIN
2026 ? FULL_BUILTIN_STACK_CHECK
2027 : GENERIC_STACK_CHECK
;
2028 else if (!strcmp (arg
, "specific"))
2029 /* This is the new stack checking method. */
2030 opts
->x_flag_stack_check
= STACK_CHECK_BUILTIN
2031 ? FULL_BUILTIN_STACK_CHECK
2032 : STACK_CHECK_STATIC_BUILTIN
2033 ? STATIC_BUILTIN_STACK_CHECK
2034 : GENERIC_STACK_CHECK
;
2036 warning_at (loc
, 0, "unknown stack check parameter %qs", arg
);
2039 case OPT_fstack_limit
:
2040 /* The real switch is -fno-stack-limit. */
2046 case OPT_fstack_limit_register_
:
2047 case OPT_fstack_limit_symbol_
:
2051 case OPT_fstack_usage
:
2052 opts
->x_flag_stack_usage
= value
;
2053 opts
->x_flag_stack_usage_info
= value
!= 0;
2057 set_debug_level (NO_DEBUG
, DEFAULT_GDB_EXTENSIONS
, arg
, opts
, opts_set
,
2062 set_debug_level (SDB_DEBUG
, false, arg
, opts
, opts_set
, loc
);
2066 if (arg
&& strlen (arg
) != 0)
2068 error_at (loc
, "%<-gdwarf%s%> is ambiguous; "
2069 "use %<-gdwarf-%s%> for DWARF version "
2070 "or %<-gdwarf -g%s%> for debug level", arg
, arg
, arg
);
2074 value
= opts
->x_dwarf_version
;
2078 if (value
< 2 || value
> 5)
2079 error_at (loc
, "dwarf version %d is not supported", value
);
2081 opts
->x_dwarf_version
= value
;
2082 set_debug_level (DWARF2_DEBUG
, false, "", opts
, opts_set
, loc
);
2085 case OPT_gsplit_dwarf
:
2086 set_debug_level (NO_DEBUG
, DEFAULT_GDB_EXTENSIONS
, "", opts
, opts_set
,
2091 set_debug_level (NO_DEBUG
, 2, arg
, opts
, opts_set
, loc
);
2096 set_debug_level (DBX_DEBUG
, code
== OPT_gstabs_
, arg
, opts
, opts_set
,
2101 set_debug_level (VMS_DEBUG
, false, arg
, opts
, opts_set
, loc
);
2106 set_debug_level (XCOFF_DEBUG
, code
== OPT_gxcoff_
, arg
, opts
, opts_set
,
2112 /* Handled completely via specs. */
2115 case OPT_pedantic_errors
:
2116 dc
->pedantic_errors
= 1;
2117 control_warning_option (OPT_Wpedantic
, DK_ERROR
, value
,
2119 handlers
, opts
, opts_set
,
2124 opts
->x_flag_lto
= value
? "" : NULL
;
2128 dc
->dc_inhibit_warnings
= true;
2131 case OPT_fmax_errors_
:
2132 dc
->max_errors
= value
;
2135 case OPT_fuse_ld_bfd
:
2136 case OPT_fuse_ld_gold
:
2137 case OPT_fuse_linker_plugin
:
2138 /* No-op. Used by the driver and passed to us because it starts with f.*/
2143 opts
->x_flag_trapv
= 0;
2148 opts
->x_flag_wrapv
= 0;
2152 opts
->x_flag_ipa_icf_functions
= value
;
2153 opts
->x_flag_ipa_icf_variables
= value
;
2157 /* If the flag was handled in a standard way, assume the lack of
2158 processing here is intentional. */
2159 gcc_assert (option_flag_var (scode
, opts
));
2163 common_handle_option_auto (opts
, opts_set
, decoded
, lang_mask
, kind
,
2168 /* Handle --param NAME=VALUE. */
2170 handle_param (struct gcc_options
*opts
, struct gcc_options
*opts_set
,
2171 location_t loc
, const char *carg
)
2176 arg
= xstrdup (carg
);
2177 equal
= strchr (arg
, '=');
2179 error_at (loc
, "%s: --param arguments should be of the form NAME=VALUE",
2185 enum compiler_param index
;
2186 if (!find_param (arg
, &index
))
2187 error_at (loc
, "invalid --param name %qs", arg
);
2190 if (!param_string_value_p (index
, equal
+ 1, &value
))
2191 value
= integral_argument (equal
+ 1);
2194 error_at (loc
, "invalid --param value %qs", equal
+ 1);
2196 set_param_value (arg
, value
,
2197 opts
->x_param_values
, opts_set
->x_param_values
);
2204 /* Used to set the level of strict aliasing warnings in OPTS,
2205 when no level is specified (i.e., when -Wstrict-aliasing, and not
2206 -Wstrict-aliasing=level was given).
2207 ONOFF is assumed to take value 1 when -Wstrict-aliasing is specified,
2208 and 0 otherwise. After calling this function, wstrict_aliasing will be
2209 set to the default value of -Wstrict_aliasing=level, currently 3. */
2211 set_Wstrict_aliasing (struct gcc_options
*opts
, int onoff
)
2213 gcc_assert (onoff
== 0 || onoff
== 1);
2215 opts
->x_warn_strict_aliasing
= 3;
2217 opts
->x_warn_strict_aliasing
= 0;
2220 /* The following routines are useful in setting all the flags that
2221 -ffast-math and -fno-fast-math imply. */
2223 set_fast_math_flags (struct gcc_options
*opts
, int set
)
2225 if (!opts
->frontend_set_flag_unsafe_math_optimizations
)
2227 opts
->x_flag_unsafe_math_optimizations
= set
;
2228 set_unsafe_math_optimizations_flags (opts
, set
);
2230 if (!opts
->frontend_set_flag_finite_math_only
)
2231 opts
->x_flag_finite_math_only
= set
;
2232 if (!opts
->frontend_set_flag_errno_math
)
2233 opts
->x_flag_errno_math
= !set
;
2236 if (!opts
->frontend_set_flag_signaling_nans
)
2237 opts
->x_flag_signaling_nans
= 0;
2238 if (!opts
->frontend_set_flag_rounding_math
)
2239 opts
->x_flag_rounding_math
= 0;
2240 if (!opts
->frontend_set_flag_cx_limited_range
)
2241 opts
->x_flag_cx_limited_range
= 1;
2245 /* When -funsafe-math-optimizations is set the following
2246 flags are set as well. */
2248 set_unsafe_math_optimizations_flags (struct gcc_options
*opts
, int set
)
2250 if (!opts
->frontend_set_flag_trapping_math
)
2251 opts
->x_flag_trapping_math
= !set
;
2252 if (!opts
->frontend_set_flag_signed_zeros
)
2253 opts
->x_flag_signed_zeros
= !set
;
2254 if (!opts
->frontend_set_flag_associative_math
)
2255 opts
->x_flag_associative_math
= set
;
2256 if (!opts
->frontend_set_flag_reciprocal_math
)
2257 opts
->x_flag_reciprocal_math
= set
;
2260 /* Return true iff flags in OPTS are set as if -ffast-math. */
2262 fast_math_flags_set_p (const struct gcc_options
*opts
)
2264 return (!opts
->x_flag_trapping_math
2265 && opts
->x_flag_unsafe_math_optimizations
2266 && opts
->x_flag_finite_math_only
2267 && !opts
->x_flag_signed_zeros
2268 && !opts
->x_flag_errno_math
);
2271 /* Return true iff flags are set as if -ffast-math but using the flags stored
2272 in the struct cl_optimization structure. */
2274 fast_math_flags_struct_set_p (struct cl_optimization
*opt
)
2276 return (!opt
->x_flag_trapping_math
2277 && opt
->x_flag_unsafe_math_optimizations
2278 && opt
->x_flag_finite_math_only
2279 && !opt
->x_flag_signed_zeros
2280 && !opt
->x_flag_errno_math
);
2283 /* Handle a debug output -g switch for options OPTS
2284 (OPTS_SET->x_write_symbols storing whether a debug type was passed
2285 explicitly), location LOC. EXTENDED is true or false to support
2286 extended output (2 is special and means "-ggdb" was given). */
2288 set_debug_level (enum debug_info_type type
, int extended
, const char *arg
,
2289 struct gcc_options
*opts
, struct gcc_options
*opts_set
,
2292 opts
->x_use_gnu_debug_info_extensions
= extended
;
2294 if (type
== NO_DEBUG
)
2296 if (opts
->x_write_symbols
== NO_DEBUG
)
2298 opts
->x_write_symbols
= PREFERRED_DEBUGGING_TYPE
;
2302 #if defined DWARF2_DEBUGGING_INFO || defined DWARF2_LINENO_DEBUGGING_INFO
2303 opts
->x_write_symbols
= DWARF2_DEBUG
;
2304 #elif defined DBX_DEBUGGING_INFO
2305 opts
->x_write_symbols
= DBX_DEBUG
;
2309 if (opts
->x_write_symbols
== NO_DEBUG
)
2310 warning_at (loc
, 0, "target system does not support debug output");
2315 /* Does it conflict with an already selected type? */
2316 if (opts_set
->x_write_symbols
!= NO_DEBUG
2317 && opts
->x_write_symbols
!= NO_DEBUG
2318 && type
!= opts
->x_write_symbols
)
2319 error_at (loc
, "debug format %qs conflicts with prior selection",
2320 debug_type_names
[type
]);
2321 opts
->x_write_symbols
= type
;
2322 opts_set
->x_write_symbols
= type
;
2325 /* A debug flag without a level defaults to level 2.
2326 If off or at level 1, set it to level 2, but if already
2327 at level 3, don't lower it. */
2330 if (opts
->x_debug_info_level
< DINFO_LEVEL_NORMAL
)
2331 opts
->x_debug_info_level
= DINFO_LEVEL_NORMAL
;
2335 int argval
= integral_argument (arg
);
2337 error_at (loc
, "unrecognised debug output level %qs", arg
);
2338 else if (argval
> 3)
2339 error_at (loc
, "debug output level %qs is too high", arg
);
2341 opts
->x_debug_info_level
= (enum debug_info_levels
) argval
;
2345 /* Arrange to dump core on error for diagnostic context DC. (The
2346 regular error message is still printed first, except in the case of
2350 setup_core_dumping (diagnostic_context
*dc
)
2353 signal (SIGABRT
, SIG_DFL
);
2355 #if defined(HAVE_SETRLIMIT)
2358 if (getrlimit (RLIMIT_CORE
, &rlim
) != 0)
2359 fatal_error (input_location
, "getting core file size maximum limit: %m");
2360 rlim
.rlim_cur
= rlim
.rlim_max
;
2361 if (setrlimit (RLIMIT_CORE
, &rlim
) != 0)
2362 fatal_error (input_location
,
2363 "setting core file size limit to maximum: %m");
2366 diagnostic_abort_on_error (dc
);
2369 /* Parse a -d<ARG> command line switch for OPTS, location LOC,
2370 diagnostic context DC. */
2373 decode_d_option (const char *arg
, struct gcc_options
*opts
,
2374 location_t loc
, diagnostic_context
*dc
)
2382 opts
->x_flag_debug_asm
= 1;
2385 opts
->x_flag_print_asm_name
= 1;
2388 opts
->x_flag_dump_rtl_in_asm
= 1;
2389 opts
->x_flag_print_asm_name
= 1;
2392 opts
->x_rtl_dump_and_exit
= 1;
2394 case 'D': /* These are handled by the preprocessor. */
2401 setup_core_dumping (dc
);
2404 opts
->x_flag_dump_all_passed
= true;
2408 warning_at (loc
, 0, "unrecognized gcc debugging option: %c", c
);
2413 /* Enable (or disable if VALUE is 0) a warning option ARG (language
2414 mask LANG_MASK, option handlers HANDLERS) as an error for option
2415 structures OPTS and OPTS_SET, diagnostic context DC (possibly
2416 NULL), location LOC. This is used by -Werror=. */
2419 enable_warning_as_error (const char *arg
, int value
, unsigned int lang_mask
,
2420 const struct cl_option_handlers
*handlers
,
2421 struct gcc_options
*opts
,
2422 struct gcc_options
*opts_set
,
2423 location_t loc
, diagnostic_context
*dc
)
2428 new_option
= XNEWVEC (char, strlen (arg
) + 2);
2429 new_option
[0] = 'W';
2430 strcpy (new_option
+ 1, arg
);
2431 option_index
= find_opt (new_option
, lang_mask
);
2432 if (option_index
== OPT_SPECIAL_unknown
)
2433 error_at (loc
, "-Werror=%s: no option -%s", arg
, new_option
);
2434 else if (!(cl_options
[option_index
].flags
& CL_WARNING
))
2435 error_at (loc
, "-Werror=%s: -%s is not an option that controls warnings",
2439 const diagnostic_t kind
= value
? DK_ERROR
: DK_WARNING
;
2441 control_warning_option (option_index
, (int) kind
, value
,
2443 handlers
, opts
, opts_set
, dc
);
2448 /* Return malloced memory for the name of the option OPTION_INDEX
2449 which enabled a diagnostic (context CONTEXT), originally of type
2450 ORIG_DIAG_KIND but possibly converted to DIAG_KIND by options such
2454 option_name (diagnostic_context
*context
, int option_index
,
2455 diagnostic_t orig_diag_kind
, diagnostic_t diag_kind
)
2459 /* A warning classified as an error. */
2460 if ((orig_diag_kind
== DK_WARNING
|| orig_diag_kind
== DK_PEDWARN
)
2461 && diag_kind
== DK_ERROR
)
2462 return concat (cl_options
[OPT_Werror_
].opt_text
,
2463 /* Skip over "-W". */
2464 cl_options
[option_index
].opt_text
+ 2,
2466 /* A warning with option. */
2468 return xstrdup (cl_options
[option_index
].opt_text
);
2470 /* A warning without option classified as an error. */
2471 else if ((orig_diag_kind
== DK_WARNING
|| orig_diag_kind
== DK_PEDWARN
2472 || diag_kind
== DK_WARNING
)
2473 && context
->warning_as_error_requested
)
2474 return xstrdup (cl_options
[OPT_Werror
].opt_text
);