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"
27 #include "tm.h" /* For STACK_CHECK_BUILTIN,
28 STACK_CHECK_STATIC_BUILTIN, DEFAULT_GDB_EXTENSIONS,
29 DWARF2_DEBUGGING_INFO and DBX_DEBUGGING_INFO. */
32 #include "diagnostic.h"
33 #include "opts-diagnostic.h"
34 #include "insn-attr-common.h"
35 #include "common/common-target.h"
37 static void set_Wstrict_aliasing (struct gcc_options *opts, int onoff);
39 /* Indexed by enum debug_info_type. */
40 const char *const debug_type_names[] =
42 "none", "stabs", "coff", "dwarf-2", "xcoff", "vms"
45 /* Parse the -femit-struct-debug-detailed option value
46 and set the flag variables. */
48 #define MATCH( prefix, string ) \
49 ((strncmp (prefix, string, sizeof prefix - 1) == 0) \
50 ? ((string += sizeof prefix - 1), 1) : 0)
53 set_struct_debug_option (struct gcc_options *opts, location_t loc,
56 /* various labels for comparison */
57 static const char dfn_lbl[] = "dfn:", dir_lbl[] = "dir:", ind_lbl[] = "ind:";
58 static const char ord_lbl[] = "ord:", gen_lbl[] = "gen:";
59 static const char none_lbl[] = "none", any_lbl[] = "any";
60 static const char base_lbl[] = "base", sys_lbl[] = "sys";
62 enum debug_struct_file files = DINFO_STRUCT_FILE_ANY;
63 /* Default is to apply to as much as possible. */
64 enum debug_info_usage usage = DINFO_USAGE_NUM_ENUMS;
68 if (MATCH (dfn_lbl, spec))
69 usage = DINFO_USAGE_DFN;
70 else if (MATCH (dir_lbl, spec))
71 usage = DINFO_USAGE_DIR_USE;
72 else if (MATCH (ind_lbl, spec))
73 usage = DINFO_USAGE_IND_USE;
75 /* Generics or not? */
76 if (MATCH (ord_lbl, spec))
78 else if (MATCH (gen_lbl, spec))
81 /* What allowable environment? */
82 if (MATCH (none_lbl, spec))
83 files = DINFO_STRUCT_FILE_NONE;
84 else if (MATCH (any_lbl, spec))
85 files = DINFO_STRUCT_FILE_ANY;
86 else if (MATCH (sys_lbl, spec))
87 files = DINFO_STRUCT_FILE_SYS;
88 else if (MATCH (base_lbl, spec))
89 files = DINFO_STRUCT_FILE_BASE;
92 "argument %qs to %<-femit-struct-debug-detailed%> "
96 /* Effect the specification. */
97 if (usage == DINFO_USAGE_NUM_ENUMS)
101 opts->x_debug_struct_ordinary[DINFO_USAGE_DFN] = files;
102 opts->x_debug_struct_ordinary[DINFO_USAGE_DIR_USE] = files;
103 opts->x_debug_struct_ordinary[DINFO_USAGE_IND_USE] = files;
107 opts->x_debug_struct_generic[DINFO_USAGE_DFN] = files;
108 opts->x_debug_struct_generic[DINFO_USAGE_DIR_USE] = files;
109 opts->x_debug_struct_generic[DINFO_USAGE_IND_USE] = files;
115 opts->x_debug_struct_ordinary[usage] = files;
117 opts->x_debug_struct_generic[usage] = files;
121 set_struct_debug_option (opts, loc, spec+1);
124 /* No more -femit-struct-debug-detailed specifications.
128 "argument %qs to %<-femit-struct-debug-detailed%> unknown",
130 if (opts->x_debug_struct_ordinary[DINFO_USAGE_DIR_USE]
131 < opts->x_debug_struct_ordinary[DINFO_USAGE_IND_USE]
132 || opts->x_debug_struct_generic[DINFO_USAGE_DIR_USE]
133 < opts->x_debug_struct_generic[DINFO_USAGE_IND_USE])
135 "%<-femit-struct-debug-detailed=dir:...%> must allow "
136 "at least as much as "
137 "%<-femit-struct-debug-detailed=ind:...%>");
141 /* Strip off a legitimate source ending from the input string NAME of
142 length LEN. Rather than having to know the names used by all of
143 our front ends, we strip off an ending of a period followed by
144 up to five characters. (Java uses ".class".) */
147 strip_off_ending (char *name, int len)
150 for (i = 2; i < 6 && len > i; i++)
152 if (name[len - i] == '.')
154 name[len - i] = '\0';
160 /* Find the base name of a path, stripping off both directories and
161 a single final extension. */
163 base_of_path (const char *path, const char **base_out)
165 const char *base = path;
167 const char *p = path;
171 if (IS_DIR_SEPARATOR (c))
186 /* What to print when a switch has no documentation. */
187 static const char undocumented_msg[] = N_("This switch lacks documentation");
189 typedef char *char_p; /* For DEF_VEC_P. */
191 static void handle_param (struct gcc_options *opts,
192 struct gcc_options *opts_set, location_t loc,
194 static void set_debug_level (enum debug_info_type type, int extended,
195 const char *arg, struct gcc_options *opts,
196 struct gcc_options *opts_set,
198 static void set_fast_math_flags (struct gcc_options *opts, int set);
199 static void decode_d_option (const char *arg, struct gcc_options *opts,
200 location_t loc, diagnostic_context *dc);
201 static void set_unsafe_math_optimizations_flags (struct gcc_options *opts,
203 static void enable_warning_as_error (const char *arg, int value,
204 unsigned int lang_mask,
205 const struct cl_option_handlers *handlers,
206 struct gcc_options *opts,
207 struct gcc_options *opts_set,
209 diagnostic_context *dc);
211 /* Handle a back-end option; arguments and return value as for
215 target_handle_option (struct gcc_options *opts,
216 struct gcc_options *opts_set,
217 const struct cl_decoded_option *decoded,
218 unsigned int lang_mask ATTRIBUTE_UNUSED, int kind,
220 const struct cl_option_handlers *handlers ATTRIBUTE_UNUSED,
221 diagnostic_context *dc)
223 gcc_assert (dc == global_dc);
224 gcc_assert (kind == DK_UNSPECIFIED);
225 return targetm_common.handle_option (opts, opts_set, decoded, loc);
228 /* Add comma-separated strings to a char_p vector. */
231 add_comma_separated_to_vector (void **pvec, const char *arg)
237 vec<char_p> *v = (vec<char_p> *) *pvec;
239 vec_check_alloc (v, 1);
241 /* We never free this string. */
254 v->safe_push (token_start);
257 if (*r == '\\' && r[1] == ',')
265 if (*token_start != '\0')
266 v->safe_push (token_start);
271 /* Initialize OPTS and OPTS_SET before using them in parsing options. */
274 init_options_struct (struct gcc_options *opts, struct gcc_options *opts_set)
276 size_t num_params = get_num_compiler_params ();
278 gcc_obstack_init (&opts_obstack);
280 *opts = global_options_init;
283 memset (opts_set, 0, sizeof (*opts_set));
285 opts->x_param_values = XNEWVEC (int, num_params);
288 opts_set->x_param_values = XCNEWVEC (int, num_params);
290 init_param_values (opts->x_param_values);
292 /* Initialize whether `char' is signed. */
293 opts->x_flag_signed_char = DEFAULT_SIGNED_CHAR;
294 /* Set this to a special "uninitialized" value. The actual default
295 is set after target options have been processed. */
296 opts->x_flag_short_enums = 2;
298 /* Initialize target_flags before default_options_optimization
299 so the latter can modify it. */
300 opts->x_target_flags = targetm_common.default_target_flags;
302 /* Some targets have ABI-specified unwind tables. */
303 opts->x_flag_unwind_tables = targetm_common.unwind_tables_default;
305 /* Some targets have other target-specific initialization. */
306 targetm_common.option_init_struct (opts);
309 /* Release any allocations owned by OPTS. */
312 finalize_options_struct (struct gcc_options *opts)
314 XDELETEVEC (opts->x_param_values);
317 /* If indicated by the optimization level LEVEL (-Os if SIZE is set,
318 -Ofast if FAST is set, -Og if DEBUG is set), apply the option DEFAULT_OPT
319 to OPTS and OPTS_SET, diagnostic context DC, location LOC, with language
320 mask LANG_MASK and option handlers HANDLERS. */
323 maybe_default_option (struct gcc_options *opts,
324 struct gcc_options *opts_set,
325 const struct default_options *default_opt,
326 int level, bool size, bool fast, bool debug,
327 unsigned int lang_mask,
328 const struct cl_option_handlers *handlers,
330 diagnostic_context *dc)
332 const struct cl_option *option = &cl_options[default_opt->opt_index];
336 gcc_assert (level == 2);
338 gcc_assert (level == 3);
340 gcc_assert (level == 1);
342 switch (default_opt->levels)
348 case OPT_LEVELS_0_ONLY:
349 enabled = (level == 0);
352 case OPT_LEVELS_1_PLUS:
353 enabled = (level >= 1);
356 case OPT_LEVELS_1_PLUS_SPEED_ONLY:
357 enabled = (level >= 1 && !size && !debug);
360 case OPT_LEVELS_1_PLUS_NOT_DEBUG:
361 enabled = (level >= 1 && !debug);
364 case OPT_LEVELS_2_PLUS:
365 enabled = (level >= 2);
368 case OPT_LEVELS_2_PLUS_SPEED_ONLY:
369 enabled = (level >= 2 && !size && !debug);
372 case OPT_LEVELS_3_PLUS:
373 enabled = (level >= 3);
376 case OPT_LEVELS_3_PLUS_AND_SIZE:
377 enabled = (level >= 3 || size);
380 case OPT_LEVELS_SIZE:
384 case OPT_LEVELS_FAST:
388 case OPT_LEVELS_NONE:
394 handle_generated_option (opts, opts_set, default_opt->opt_index,
395 default_opt->arg, default_opt->value,
396 lang_mask, DK_UNSPECIFIED, loc,
398 else if (default_opt->arg == NULL
399 && !option->cl_reject_negative)
400 handle_generated_option (opts, opts_set, default_opt->opt_index,
401 default_opt->arg, !default_opt->value,
402 lang_mask, DK_UNSPECIFIED, loc,
406 /* As indicated by the optimization level LEVEL (-Os if SIZE is set,
407 -Ofast if FAST is set), apply the options in array DEFAULT_OPTS to
408 OPTS and OPTS_SET, diagnostic context DC, location LOC, with
409 language mask LANG_MASK and option handlers HANDLERS. */
412 maybe_default_options (struct gcc_options *opts,
413 struct gcc_options *opts_set,
414 const struct default_options *default_opts,
415 int level, bool size, bool fast, bool debug,
416 unsigned int lang_mask,
417 const struct cl_option_handlers *handlers,
419 diagnostic_context *dc)
423 for (i = 0; default_opts[i].levels != OPT_LEVELS_NONE; i++)
424 maybe_default_option (opts, opts_set, &default_opts[i],
425 level, size, fast, debug,
426 lang_mask, handlers, loc, dc);
429 /* Table of options enabled by default at different levels. */
431 static const struct default_options default_options_table[] =
433 /* -O1 optimizations. */
434 { OPT_LEVELS_1_PLUS, OPT_fdefer_pop, NULL, 1 },
436 { OPT_LEVELS_1_PLUS, OPT_fdelayed_branch, NULL, 1 },
438 { OPT_LEVELS_1_PLUS, OPT_fguess_branch_probability, NULL, 1 },
439 { OPT_LEVELS_1_PLUS, OPT_fcprop_registers, NULL, 1 },
440 { OPT_LEVELS_1_PLUS, OPT_fforward_propagate, NULL, 1 },
441 { OPT_LEVELS_1_PLUS_NOT_DEBUG, OPT_fif_conversion, NULL, 1 },
442 { OPT_LEVELS_1_PLUS_NOT_DEBUG, OPT_fif_conversion2, NULL, 1 },
443 { OPT_LEVELS_1_PLUS, OPT_fipa_pure_const, NULL, 1 },
444 { OPT_LEVELS_1_PLUS, OPT_fipa_reference, NULL, 1 },
445 { OPT_LEVELS_1_PLUS, OPT_fipa_profile, NULL, 1 },
446 { OPT_LEVELS_1_PLUS, OPT_fmerge_constants, NULL, 1 },
447 { OPT_LEVELS_1_PLUS, OPT_fshrink_wrap, NULL, 1 },
448 { OPT_LEVELS_1_PLUS, OPT_fsplit_wide_types, NULL, 1 },
449 { OPT_LEVELS_1_PLUS, OPT_ftree_ccp, NULL, 1 },
450 { OPT_LEVELS_1_PLUS_NOT_DEBUG, OPT_ftree_bit_ccp, NULL, 1 },
451 { OPT_LEVELS_1_PLUS, OPT_ftree_dce, NULL, 1 },
452 { OPT_LEVELS_1_PLUS, OPT_ftree_dominator_opts, NULL, 1 },
453 { OPT_LEVELS_1_PLUS, OPT_ftree_dse, NULL, 1 },
454 { OPT_LEVELS_1_PLUS, OPT_ftree_ter, NULL, 1 },
455 { OPT_LEVELS_1_PLUS_NOT_DEBUG, OPT_ftree_sra, NULL, 1 },
456 { OPT_LEVELS_1_PLUS, OPT_ftree_copyrename, NULL, 1 },
457 { OPT_LEVELS_1_PLUS, OPT_ftree_fre, NULL, 1 },
458 { OPT_LEVELS_1_PLUS, OPT_ftree_copy_prop, NULL, 1 },
459 { OPT_LEVELS_1_PLUS, OPT_ftree_sink, NULL, 1 },
460 { OPT_LEVELS_1_PLUS, OPT_ftree_ch, NULL, 1 },
461 { OPT_LEVELS_1_PLUS, OPT_fcombine_stack_adjustments, NULL, 1 },
462 { OPT_LEVELS_1_PLUS, OPT_fcompare_elim, NULL, 1 },
463 { OPT_LEVELS_1_PLUS, OPT_ftree_slsr, NULL, 1 },
464 { OPT_LEVELS_1_PLUS_NOT_DEBUG, OPT_fbranch_count_reg, NULL, 1 },
465 { OPT_LEVELS_1_PLUS_NOT_DEBUG, OPT_fmove_loop_invariants, NULL, 1 },
466 { OPT_LEVELS_1_PLUS_NOT_DEBUG, OPT_ftree_pta, NULL, 1 },
467 { OPT_LEVELS_1_PLUS_NOT_DEBUG, OPT_fssa_phiopt, NULL, 1 },
469 /* -O2 optimizations. */
470 { OPT_LEVELS_2_PLUS, OPT_finline_small_functions, NULL, 1 },
471 { OPT_LEVELS_2_PLUS, OPT_findirect_inlining, NULL, 1 },
472 { OPT_LEVELS_2_PLUS, OPT_fpartial_inlining, NULL, 1 },
473 { OPT_LEVELS_2_PLUS, OPT_fthread_jumps, NULL, 1 },
474 { OPT_LEVELS_2_PLUS, OPT_fcrossjumping, NULL, 1 },
475 { OPT_LEVELS_2_PLUS, OPT_foptimize_sibling_calls, NULL, 1 },
476 { OPT_LEVELS_2_PLUS, OPT_fcse_follow_jumps, NULL, 1 },
477 { OPT_LEVELS_2_PLUS, OPT_fgcse, NULL, 1 },
478 { OPT_LEVELS_2_PLUS, OPT_fexpensive_optimizations, NULL, 1 },
479 { OPT_LEVELS_2_PLUS, OPT_frerun_cse_after_loop, NULL, 1 },
480 { OPT_LEVELS_2_PLUS, OPT_fcaller_saves, NULL, 1 },
481 { OPT_LEVELS_2_PLUS, OPT_fpeephole2, NULL, 1 },
482 #ifdef INSN_SCHEDULING
483 /* Only run the pre-regalloc scheduling pass if optimizing for speed. */
484 { OPT_LEVELS_2_PLUS_SPEED_ONLY, OPT_fschedule_insns, NULL, 1 },
485 { OPT_LEVELS_2_PLUS, OPT_fschedule_insns2, NULL, 1 },
487 { OPT_LEVELS_2_PLUS, OPT_fstrict_aliasing, NULL, 1 },
488 { OPT_LEVELS_2_PLUS, OPT_fstrict_overflow, NULL, 1 },
489 { OPT_LEVELS_2_PLUS, OPT_freorder_blocks, NULL, 1 },
490 { OPT_LEVELS_2_PLUS, OPT_freorder_functions, NULL, 1 },
491 { OPT_LEVELS_2_PLUS, OPT_ftree_vrp, NULL, 1 },
492 { OPT_LEVELS_2_PLUS, OPT_ftree_builtin_call_dce, NULL, 1 },
493 { OPT_LEVELS_2_PLUS, OPT_ftree_pre, NULL, 1 },
494 { OPT_LEVELS_2_PLUS, OPT_ftree_switch_conversion, NULL, 1 },
495 { OPT_LEVELS_2_PLUS, OPT_fipa_cp, NULL, 1 },
496 { OPT_LEVELS_2_PLUS, OPT_fipa_cp_alignment, NULL, 1 },
497 { OPT_LEVELS_2_PLUS, OPT_fdevirtualize, NULL, 1 },
498 { OPT_LEVELS_2_PLUS, OPT_fdevirtualize_speculatively, NULL, 1 },
499 { OPT_LEVELS_2_PLUS, OPT_fipa_sra, NULL, 1 },
500 { OPT_LEVELS_2_PLUS, OPT_falign_loops, NULL, 1 },
501 { OPT_LEVELS_2_PLUS, OPT_falign_jumps, NULL, 1 },
502 { OPT_LEVELS_2_PLUS, OPT_falign_labels, NULL, 1 },
503 { OPT_LEVELS_2_PLUS, OPT_falign_functions, NULL, 1 },
504 { OPT_LEVELS_2_PLUS, OPT_ftree_tail_merge, NULL, 1 },
505 { OPT_LEVELS_2_PLUS, OPT_fvect_cost_model_, NULL, VECT_COST_MODEL_CHEAP },
506 { OPT_LEVELS_2_PLUS_SPEED_ONLY, OPT_foptimize_strlen, NULL, 1 },
507 { OPT_LEVELS_2_PLUS, OPT_fhoist_adjacent_loads, NULL, 1 },
508 { OPT_LEVELS_2_PLUS, OPT_fipa_icf, NULL, 1 },
509 { OPT_LEVELS_2_PLUS, OPT_fisolate_erroneous_paths_dereference, NULL, 1 },
510 { OPT_LEVELS_2_PLUS, OPT_fipa_ra, NULL, 1 },
511 { OPT_LEVELS_2_PLUS, OPT_flra_remat, NULL, 1 },
513 /* -O3 optimizations. */
514 { OPT_LEVELS_3_PLUS, OPT_ftree_loop_distribute_patterns, NULL, 1 },
515 { OPT_LEVELS_3_PLUS, OPT_fpredictive_commoning, NULL, 1 },
516 /* Inlining of functions reducing size is a good idea with -Os
517 regardless of them being declared inline. */
518 { OPT_LEVELS_3_PLUS_AND_SIZE, OPT_finline_functions, NULL, 1 },
519 { OPT_LEVELS_1_PLUS_NOT_DEBUG, OPT_finline_functions_called_once, NULL, 1 },
520 { OPT_LEVELS_3_PLUS, OPT_funswitch_loops, NULL, 1 },
521 { OPT_LEVELS_3_PLUS, OPT_fgcse_after_reload, NULL, 1 },
522 { OPT_LEVELS_3_PLUS, OPT_ftree_loop_vectorize, NULL, 1 },
523 { OPT_LEVELS_3_PLUS, OPT_ftree_slp_vectorize, NULL, 1 },
524 { OPT_LEVELS_3_PLUS, OPT_fvect_cost_model_, NULL, VECT_COST_MODEL_DYNAMIC },
525 { OPT_LEVELS_3_PLUS, OPT_fipa_cp_clone, NULL, 1 },
526 { OPT_LEVELS_3_PLUS, OPT_ftree_partial_pre, NULL, 1 },
528 /* -Ofast adds optimizations to -O3. */
529 { OPT_LEVELS_FAST, OPT_ffast_math, NULL, 1 },
531 { OPT_LEVELS_NONE, 0, NULL, 0 }
534 /* Default the options in OPTS and OPTS_SET based on the optimization
535 settings in DECODED_OPTIONS and DECODED_OPTIONS_COUNT. */
537 default_options_optimization (struct gcc_options *opts,
538 struct gcc_options *opts_set,
539 struct cl_decoded_option *decoded_options,
540 unsigned int decoded_options_count,
542 unsigned int lang_mask,
543 const struct cl_option_handlers *handlers,
544 diagnostic_context *dc)
549 /* Scan to see what optimization level has been specified. That will
550 determine the default value of many flags. */
551 for (i = 1; i < decoded_options_count; i++)
553 struct cl_decoded_option *opt = &decoded_options[i];
554 switch (opt->opt_index)
557 if (*opt->arg == '\0')
559 opts->x_optimize = 1;
560 opts->x_optimize_size = 0;
561 opts->x_optimize_fast = 0;
562 opts->x_optimize_debug = 0;
566 const int optimize_val = integral_argument (opt->arg);
567 if (optimize_val == -1)
568 error_at (loc, "argument to %<-O%> should be a non-negative "
569 "integer, %<g%>, %<s%> or %<fast%>");
572 opts->x_optimize = optimize_val;
573 if ((unsigned int) opts->x_optimize > 255)
574 opts->x_optimize = 255;
575 opts->x_optimize_size = 0;
576 opts->x_optimize_fast = 0;
577 opts->x_optimize_debug = 0;
583 opts->x_optimize_size = 1;
585 /* Optimizing for size forces optimize to be 2. */
586 opts->x_optimize = 2;
587 opts->x_optimize_fast = 0;
588 opts->x_optimize_debug = 0;
592 /* -Ofast only adds flags to -O3. */
593 opts->x_optimize_size = 0;
594 opts->x_optimize = 3;
595 opts->x_optimize_fast = 1;
596 opts->x_optimize_debug = 0;
600 /* -Og selects optimization level 1. */
601 opts->x_optimize_size = 0;
602 opts->x_optimize = 1;
603 opts->x_optimize_fast = 0;
604 opts->x_optimize_debug = 1;
608 /* Ignore other options in this prescan. */
613 maybe_default_options (opts, opts_set, default_options_table,
614 opts->x_optimize, opts->x_optimize_size,
615 opts->x_optimize_fast, opts->x_optimize_debug,
616 lang_mask, handlers, loc, dc);
618 /* -O2 param settings. */
619 opt2 = (opts->x_optimize >= 2);
621 /* Track fields in field-sensitive alias analysis. */
622 maybe_set_param_value
623 (PARAM_MAX_FIELDS_FOR_FIELD_SENSITIVE,
624 opt2 ? 100 : default_param_value (PARAM_MAX_FIELDS_FOR_FIELD_SENSITIVE),
625 opts->x_param_values, opts_set->x_param_values);
627 /* For -O1 only do loop invariant motion for very small loops. */
628 maybe_set_param_value
629 (PARAM_LOOP_INVARIANT_MAX_BBS_IN_LOOP,
630 opt2 ? default_param_value (PARAM_LOOP_INVARIANT_MAX_BBS_IN_LOOP) : 1000,
631 opts->x_param_values, opts_set->x_param_values);
633 /* At -Ofast, allow store motion to introduce potential race conditions. */
634 maybe_set_param_value
635 (PARAM_ALLOW_STORE_DATA_RACES,
636 opts->x_optimize_fast ? 1
637 : default_param_value (PARAM_ALLOW_STORE_DATA_RACES),
638 opts->x_param_values, opts_set->x_param_values);
640 if (opts->x_optimize_size)
641 /* We want to crossjump as much as possible. */
642 maybe_set_param_value (PARAM_MIN_CROSSJUMP_INSNS, 1,
643 opts->x_param_values, opts_set->x_param_values);
645 maybe_set_param_value (PARAM_MIN_CROSSJUMP_INSNS,
646 default_param_value (PARAM_MIN_CROSSJUMP_INSNS),
647 opts->x_param_values, opts_set->x_param_values);
649 /* Restrict the amount of work combine does at -Og while retaining
650 most of its useful transforms. */
651 if (opts->x_optimize_debug)
652 maybe_set_param_value (PARAM_MAX_COMBINE_INSNS, 2,
653 opts->x_param_values, opts_set->x_param_values);
655 /* Allow default optimizations to be specified on a per-machine basis. */
656 maybe_default_options (opts, opts_set,
657 targetm_common.option_optimization_table,
658 opts->x_optimize, opts->x_optimize_size,
659 opts->x_optimize_fast, opts->x_optimize_debug,
660 lang_mask, handlers, loc, dc);
663 /* After all options at LOC have been read into OPTS and OPTS_SET,
664 finalize settings of those options and diagnose incompatible
667 finish_options (struct gcc_options *opts, struct gcc_options *opts_set,
670 enum unwind_info_type ui_except;
672 if (opts->x_dump_base_name
673 && ! IS_ABSOLUTE_PATH (opts->x_dump_base_name)
674 && ! opts->x_dump_base_name_prefixed)
676 /* First try to make OPTS->X_DUMP_BASE_NAME relative to the
677 OPTS->X_DUMP_DIR_NAME directory. Then try to make
678 OPTS->X_DUMP_BASE_NAME relative to the OPTS->X_AUX_BASE_NAME
679 directory, typically the directory to contain the object
681 if (opts->x_dump_dir_name)
682 opts->x_dump_base_name = opts_concat (opts->x_dump_dir_name,
683 opts->x_dump_base_name, NULL);
684 else if (opts->x_aux_base_name
685 && strcmp (opts->x_aux_base_name, HOST_BIT_BUCKET) != 0)
687 const char *aux_base;
689 base_of_path (opts->x_aux_base_name, &aux_base);
690 if (opts->x_aux_base_name != aux_base)
692 int dir_len = aux_base - opts->x_aux_base_name;
693 char *new_dump_base_name
694 = XOBNEWVEC (&opts_obstack, char,
695 strlen (opts->x_dump_base_name) + dir_len + 1);
697 /* Copy directory component from OPTS->X_AUX_BASE_NAME. */
698 memcpy (new_dump_base_name, opts->x_aux_base_name, dir_len);
699 /* Append existing OPTS->X_DUMP_BASE_NAME. */
700 strcpy (new_dump_base_name + dir_len, opts->x_dump_base_name);
701 opts->x_dump_base_name = new_dump_base_name;
704 opts->x_dump_base_name_prefixed = true;
707 /* Handle related options for unit-at-a-time, toplevel-reorder, and
709 if (!opts->x_flag_unit_at_a_time)
711 if (opts->x_flag_section_anchors && opts_set->x_flag_section_anchors)
712 error_at (loc, "section anchors must be disabled when unit-at-a-time "
714 opts->x_flag_section_anchors = 0;
715 if (opts->x_flag_toplevel_reorder == 1)
716 error_at (loc, "toplevel reorder must be disabled when unit-at-a-time "
718 opts->x_flag_toplevel_reorder = 0;
721 if (opts->x_flag_tm && opts->x_flag_non_call_exceptions)
722 sorry ("transactional memory is not supported with non-call exceptions");
724 /* Unless the user has asked for section anchors, we disable toplevel
725 reordering at -O0 to disable transformations that might be surprising
726 to end users and to get -fno-toplevel-reorder tested. */
727 if (!opts->x_optimize
728 && opts->x_flag_toplevel_reorder == 2
729 && !(opts->x_flag_section_anchors && opts_set->x_flag_section_anchors))
731 opts->x_flag_toplevel_reorder = 0;
732 opts->x_flag_section_anchors = 0;
734 if (!opts->x_flag_toplevel_reorder)
736 if (opts->x_flag_section_anchors && opts_set->x_flag_section_anchors)
737 error_at (loc, "section anchors must be disabled when toplevel reorder"
739 opts->x_flag_section_anchors = 0;
742 if (!opts->x_flag_opts_finished)
744 if (opts->x_flag_pie)
745 opts->x_flag_pic = opts->x_flag_pie;
746 if (opts->x_flag_pic && !opts->x_flag_pie)
747 opts->x_flag_shlib = 1;
748 opts->x_flag_opts_finished = true;
751 if (opts->x_optimize == 0)
753 /* Inlining does not work if not optimizing,
754 so force it not to be done. */
755 opts->x_warn_inline = 0;
756 opts->x_flag_no_inline = 1;
759 /* The optimization to partition hot and cold basic blocks into separate
760 sections of the .o and executable files does not work (currently)
761 with exception handling. This is because there is no support for
762 generating unwind info. If opts->x_flag_exceptions is turned on
763 we need to turn off the partitioning optimization. */
765 ui_except = targetm_common.except_unwind_info (opts);
767 if (opts->x_flag_exceptions
768 && opts->x_flag_reorder_blocks_and_partition
769 && (ui_except == UI_SJLJ || ui_except >= UI_TARGET))
771 if (opts_set->x_flag_reorder_blocks_and_partition)
773 "-freorder-blocks-and-partition does not work "
774 "with exceptions on this architecture");
775 opts->x_flag_reorder_blocks_and_partition = 0;
776 opts->x_flag_reorder_blocks = 1;
779 /* If user requested unwind info, then turn off the partitioning
782 if (opts->x_flag_unwind_tables
783 && !targetm_common.unwind_tables_default
784 && opts->x_flag_reorder_blocks_and_partition
785 && (ui_except == UI_SJLJ || ui_except >= UI_TARGET))
787 if (opts_set->x_flag_reorder_blocks_and_partition)
789 "-freorder-blocks-and-partition does not support "
790 "unwind info on this architecture");
791 opts->x_flag_reorder_blocks_and_partition = 0;
792 opts->x_flag_reorder_blocks = 1;
795 /* If the target requested unwind info, then turn off the partitioning
796 optimization with a different message. Likewise, if the target does not
797 support named sections. */
799 if (opts->x_flag_reorder_blocks_and_partition
800 && (!targetm_common.have_named_sections
801 || (opts->x_flag_unwind_tables
802 && targetm_common.unwind_tables_default
803 && (ui_except == UI_SJLJ || ui_except >= UI_TARGET))))
805 if (opts_set->x_flag_reorder_blocks_and_partition)
807 "-freorder-blocks-and-partition does not work "
808 "on this architecture");
809 opts->x_flag_reorder_blocks_and_partition = 0;
810 opts->x_flag_reorder_blocks = 1;
813 if (opts->x_flag_reorder_blocks_and_partition
814 && !opts_set->x_flag_reorder_functions)
815 opts->x_flag_reorder_functions = 1;
817 /* Pipelining of outer loops is only possible when general pipelining
818 capabilities are requested. */
819 if (!opts->x_flag_sel_sched_pipelining)
820 opts->x_flag_sel_sched_pipelining_outer_loops = 0;
822 if (opts->x_flag_conserve_stack)
824 maybe_set_param_value (PARAM_LARGE_STACK_FRAME, 100,
825 opts->x_param_values, opts_set->x_param_values);
826 maybe_set_param_value (PARAM_STACK_FRAME_GROWTH, 40,
827 opts->x_param_values, opts_set->x_param_values);
830 if (opts->x_flag_lto)
833 opts->x_flag_generate_lto = 1;
835 /* When generating IL, do not operate in whole-program mode.
836 Otherwise, symbols will be privatized too early, causing link
838 opts->x_flag_whole_program = 0;
840 error_at (loc, "LTO support has not been enabled in this configuration");
842 if (!opts->x_flag_fat_lto_objects
844 || (opts_set->x_flag_use_linker_plugin
845 && !opts->x_flag_use_linker_plugin)))
847 if (opts_set->x_flag_fat_lto_objects)
848 error_at (loc, "-fno-fat-lto-objects are supported only with linker plugin");
849 opts->x_flag_fat_lto_objects = 1;
853 /* We initialize opts->x_flag_split_stack to -1 so that targets can set a
854 default value if they choose based on other options. */
855 if (opts->x_flag_split_stack == -1)
856 opts->x_flag_split_stack = 0;
857 else if (opts->x_flag_split_stack)
859 if (!targetm_common.supports_split_stack (true, opts))
861 error_at (loc, "%<-fsplit-stack%> is not supported by "
862 "this compiler configuration");
863 opts->x_flag_split_stack = 0;
867 /* Tune vectorization related parametees according to cost model. */
868 if (opts->x_flag_vect_cost_model == VECT_COST_MODEL_CHEAP)
870 maybe_set_param_value (PARAM_VECT_MAX_VERSION_FOR_ALIAS_CHECKS,
871 6, opts->x_param_values, opts_set->x_param_values);
872 maybe_set_param_value (PARAM_VECT_MAX_VERSION_FOR_ALIGNMENT_CHECKS,
873 0, opts->x_param_values, opts_set->x_param_values);
874 maybe_set_param_value (PARAM_VECT_MAX_PEELING_FOR_ALIGNMENT,
875 0, opts->x_param_values, opts_set->x_param_values);
878 /* Set PARAM_MAX_STORES_TO_SINK to 0 if either vectorization or if-conversion
880 if ((!opts->x_flag_tree_loop_vectorize && !opts->x_flag_tree_slp_vectorize)
881 || !opts->x_flag_tree_loop_if_convert)
882 maybe_set_param_value (PARAM_MAX_STORES_TO_SINK, 0,
883 opts->x_param_values, opts_set->x_param_values);
885 /* The -gsplit-dwarf option requires -ggnu-pubnames. */
886 if (opts->x_dwarf_split_debug_info)
887 opts->x_debug_generate_pub_sections = 2;
889 /* Userspace and kernel ASan conflict with each other. */
891 if ((opts->x_flag_sanitize & SANITIZE_USER_ADDRESS)
892 && (opts->x_flag_sanitize & SANITIZE_KERNEL_ADDRESS))
894 "-fsanitize=address is incompatible with "
895 "-fsanitize=kernel-address");
899 if ((opts->x_flag_sanitize & SANITIZE_ADDRESS)
900 && (opts->x_flag_sanitize & SANITIZE_THREAD))
902 "-fsanitize=address and -fsanitize=kernel-address "
903 "are incompatible with -fsanitize=thread");
905 /* Error recovery is not allowed for ASan and TSan. */
907 if (opts->x_flag_sanitize_recover & SANITIZE_USER_ADDRESS)
908 error_at (loc, "-fsanitize-recover=address is not supported");
910 if (opts->x_flag_sanitize_recover & SANITIZE_THREAD)
911 error_at (loc, "-fsanitize-recover=thread is not supported");
913 if (opts->x_flag_sanitize_recover & SANITIZE_LEAK)
914 error_at (loc, "-fsanitize-recover=leak is not supported");
916 /* When instrumenting the pointers, we don't want to remove
917 the null pointer checks. */
918 if (opts->x_flag_sanitize & (SANITIZE_NULL | SANITIZE_NONNULL_ATTRIBUTE
919 | SANITIZE_RETURNS_NONNULL_ATTRIBUTE))
920 opts->x_flag_delete_null_pointer_checks = 0;
922 /* Aggressive compiler optimizations may cause false negatives. */
923 if (opts->x_flag_sanitize)
925 opts->x_flag_aggressive_loop_optimizations = 0;
926 opts->x_flag_strict_overflow = 0;
930 #define LEFT_COLUMN 27
932 /* Output ITEM, of length ITEM_WIDTH, in the left column,
933 followed by word-wrapped HELP in a second column. */
935 wrap_help (const char *help,
937 unsigned int item_width,
938 unsigned int columns)
940 unsigned int col_width = LEFT_COLUMN;
941 unsigned int remaining, room, len;
943 remaining = strlen (help);
947 room = columns - 3 - MAX (col_width, item_width);
956 for (i = 0; help[i]; i++)
958 if (i >= room && len != remaining)
962 else if ((help[i] == '-' || help[i] == '/')
963 && help[i + 1] != ' '
964 && i > 0 && ISALPHA (help[i - 1]))
969 printf (" %-*.*s %.*s\n", col_width, item_width, item, len, help);
971 while (help[len] == ' ')
979 /* Print help for a specific front-end, etc. */
981 print_filtered_help (unsigned int include_flags,
982 unsigned int exclude_flags,
983 unsigned int any_flags,
984 unsigned int columns,
985 struct gcc_options *opts,
986 unsigned int lang_mask)
991 bool displayed = false;
994 if (include_flags == CL_PARAMS)
996 for (i = 0; i < LAST_PARAM; i++)
998 const char *param = compiler_params[i].option;
1000 help = compiler_params[i].help;
1001 if (help == NULL || *help == '\0')
1003 if (exclude_flags & CL_UNDOCUMENTED)
1005 help = undocumented_msg;
1008 /* Get the translation. */
1011 if (!opts->x_quiet_flag)
1013 snprintf (new_help, sizeof (new_help),
1014 _("default %d minimum %d maximum %d"),
1015 compiler_params[i].default_value,
1016 compiler_params[i].min_value,
1017 compiler_params[i].max_value);
1020 wrap_help (help, param, strlen (param), columns);
1026 if (!opts->x_help_printed)
1027 opts->x_help_printed = XCNEWVAR (char, cl_options_count);
1029 if (!opts->x_help_enum_printed)
1030 opts->x_help_enum_printed = XCNEWVAR (char, cl_enums_count);
1032 for (i = 0; i < cl_options_count; i++)
1034 const struct cl_option *option = cl_options + i;
1039 if (include_flags == 0
1040 || ((option->flags & include_flags) != include_flags))
1042 if ((option->flags & any_flags) == 0)
1046 /* Skip unwanted switches. */
1047 if ((option->flags & exclude_flags) != 0)
1050 /* The driver currently prints its own help text. */
1051 if ((option->flags & CL_DRIVER) != 0
1052 && (option->flags & (((1U << cl_lang_count) - 1)
1053 | CL_COMMON | CL_TARGET)) == 0)
1057 /* Skip switches that have already been printed. */
1058 if (opts->x_help_printed[i])
1061 opts->x_help_printed[i] = true;
1063 help = option->help;
1066 if (exclude_flags & CL_UNDOCUMENTED)
1068 help = undocumented_msg;
1071 /* Get the translation. */
1074 /* Find the gap between the name of the
1075 option and its descriptive text. */
1076 tab = strchr (help, '\t');
1085 opt = option->opt_text;
1089 /* With the -Q option enabled we change the descriptive text associated
1090 with an option to be an indication of its current setting. */
1091 if (!opts->x_quiet_flag)
1093 void *flag_var = option_flag_var (i, opts);
1095 if (len < (LEFT_COLUMN + 2))
1096 strcpy (new_help, "\t\t");
1098 strcpy (new_help, "\t");
1100 if (flag_var != NULL
1101 && option->var_type != CLVC_DEFER)
1103 if (option->flags & CL_JOINED)
1105 if (option->var_type == CLVC_STRING)
1107 if (* (const char **) flag_var != NULL)
1108 snprintf (new_help + strlen (new_help),
1109 sizeof (new_help) - strlen (new_help),
1110 "%s", * (const char **) flag_var);
1112 else if (option->var_type == CLVC_ENUM)
1114 const struct cl_enum *e = &cl_enums[option->var_enum];
1116 const char *arg = NULL;
1118 value = e->get (flag_var);
1119 enum_value_to_arg (e->values, &arg, value, lang_mask);
1121 arg = _("[default]");
1122 snprintf (new_help + strlen (new_help),
1123 sizeof (new_help) - strlen (new_help),
1127 sprintf (new_help + strlen (new_help),
1128 "%#x", * (int *) flag_var);
1131 strcat (new_help, option_enabled (i, opts)
1132 ? _("[enabled]") : _("[disabled]"));
1138 wrap_help (help, opt, len, columns);
1141 if (option->var_type == CLVC_ENUM
1142 && opts->x_help_enum_printed[option->var_enum] != 2)
1143 opts->x_help_enum_printed[option->var_enum] = 1;
1148 unsigned int langs = include_flags & CL_LANG_ALL;
1151 printf (_(" No options with the desired characteristics were found\n"));
1156 /* PR 31349: Tell the user how to see all of the
1157 options supported by a specific front end. */
1158 for (i = 0; (1U << i) < CL_LANG_ALL; i ++)
1159 if ((1U << i) & langs)
1160 printf (_(" None found. Use --help=%s to show *all* the options supported by the %s front-end\n"),
1161 lang_names[i], lang_names[i]);
1165 else if (! displayed)
1166 printf (_(" All options with the desired characteristics have already been displayed\n"));
1170 /* Print details of enumerated option arguments, if those
1171 enumerations have help text headings provided. If no help text
1172 is provided, presume that the possible values are listed in the
1173 help text for the relevant options. */
1174 for (i = 0; i < cl_enums_count; i++)
1176 unsigned int j, pos;
1178 if (opts->x_help_enum_printed[i] != 1)
1180 if (cl_enums[i].help == NULL)
1182 printf (" %s\n ", _(cl_enums[i].help));
1184 for (j = 0; cl_enums[i].values[j].arg != NULL; j++)
1186 unsigned int len = strlen (cl_enums[i].values[j].arg);
1188 if (pos > 4 && pos + 1 + len <= columns)
1190 printf (" %s", cl_enums[i].values[j].arg);
1200 printf ("%s", cl_enums[i].values[j].arg);
1205 opts->x_help_enum_printed[i] = 2;
1209 /* Display help for a specified type of option.
1210 The options must have ALL of the INCLUDE_FLAGS set
1211 ANY of the flags in the ANY_FLAGS set
1212 and NONE of the EXCLUDE_FLAGS set. The current option state is in
1213 OPTS; LANG_MASK is used for interpreting enumerated option state. */
1215 print_specific_help (unsigned int include_flags,
1216 unsigned int exclude_flags,
1217 unsigned int any_flags,
1218 struct gcc_options *opts,
1219 unsigned int lang_mask)
1221 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1222 const char * description = NULL;
1223 const char * descrip_extra = "";
1227 /* Sanity check: Make sure that we do not have more
1228 languages than we have bits available to enumerate them. */
1229 gcc_assert ((1U << cl_lang_count) <= CL_MIN_OPTION_CLASS);
1231 /* If we have not done so already, obtain
1232 the desired maximum width of the output. */
1233 if (opts->x_help_columns == 0)
1235 opts->x_help_columns = get_terminal_width ();
1236 if (opts->x_help_columns == INT_MAX)
1237 /* Use a reasonable default. */
1238 opts->x_help_columns = 80;
1241 /* Decide upon the title for the options that we are going to display. */
1242 for (i = 0, flag = 1; flag <= CL_MAX_OPTION_CLASS; flag <<= 1, i ++)
1244 switch (flag & include_flags)
1251 description = _("The following options are target specific");
1254 description = _("The following options control compiler warning messages");
1256 case CL_OPTIMIZATION:
1257 description = _("The following options control optimizations");
1260 description = _("The following options are language-independent");
1263 description = _("The --param option recognizes the following as parameters");
1266 if (i >= cl_lang_count)
1268 if (exclude_flags & all_langs_mask)
1269 description = _("The following options are specific to just the language ");
1271 description = _("The following options are supported by the language ");
1272 descrip_extra = lang_names [i];
1277 if (description == NULL)
1281 if (include_flags & CL_UNDOCUMENTED)
1282 description = _("The following options are not documented");
1283 else if (include_flags & CL_SEPARATE)
1284 description = _("The following options take separate arguments");
1285 else if (include_flags & CL_JOINED)
1286 description = _("The following options take joined arguments");
1289 internal_error ("unrecognized include_flags 0x%x passed to print_specific_help",
1296 if (any_flags & all_langs_mask)
1297 description = _("The following options are language-related");
1299 description = _("The following options are language-independent");
1303 printf ("%s%s:\n", description, descrip_extra);
1304 print_filtered_help (include_flags, exclude_flags, any_flags,
1305 opts->x_help_columns, opts, lang_mask);
1308 /* Enable FDO-related flags. */
1311 enable_fdo_optimizations (struct gcc_options *opts,
1312 struct gcc_options *opts_set,
1315 if (!opts_set->x_flag_branch_probabilities)
1316 opts->x_flag_branch_probabilities = value;
1317 if (!opts_set->x_flag_profile_values)
1318 opts->x_flag_profile_values = value;
1319 if (!opts_set->x_flag_unroll_loops)
1320 opts->x_flag_unroll_loops = value;
1321 if (!opts_set->x_flag_peel_loops)
1322 opts->x_flag_peel_loops = value;
1323 if (!opts_set->x_flag_tracer)
1324 opts->x_flag_tracer = value;
1325 if (!opts_set->x_flag_value_profile_transformations)
1326 opts->x_flag_value_profile_transformations = value;
1327 if (!opts_set->x_flag_inline_functions)
1328 opts->x_flag_inline_functions = value;
1329 if (!opts_set->x_flag_ipa_cp)
1330 opts->x_flag_ipa_cp = value;
1331 if (!opts_set->x_flag_ipa_cp_clone
1332 && value && opts->x_flag_ipa_cp)
1333 opts->x_flag_ipa_cp_clone = value;
1334 if (!opts_set->x_flag_ipa_cp_alignment
1335 && value && opts->x_flag_ipa_cp)
1336 opts->x_flag_ipa_cp_alignment = value;
1337 if (!opts_set->x_flag_predictive_commoning)
1338 opts->x_flag_predictive_commoning = value;
1339 if (!opts_set->x_flag_unswitch_loops)
1340 opts->x_flag_unswitch_loops = value;
1341 if (!opts_set->x_flag_gcse_after_reload)
1342 opts->x_flag_gcse_after_reload = value;
1343 if (!opts_set->x_flag_tree_loop_vectorize
1344 && !opts_set->x_flag_tree_vectorize)
1345 opts->x_flag_tree_loop_vectorize = value;
1346 if (!opts_set->x_flag_tree_slp_vectorize
1347 && !opts_set->x_flag_tree_vectorize)
1348 opts->x_flag_tree_slp_vectorize = value;
1349 if (!opts_set->x_flag_vect_cost_model)
1350 opts->x_flag_vect_cost_model = VECT_COST_MODEL_DYNAMIC;
1351 if (!opts_set->x_flag_tree_loop_distribute_patterns)
1352 opts->x_flag_tree_loop_distribute_patterns = value;
1355 /* Handle target- and language-independent options. Return zero to
1356 generate an "unknown option" message. Only options that need
1357 extra handling need to be listed here; if you simply want
1358 DECODED->value assigned to a variable, it happens automatically. */
1361 common_handle_option (struct gcc_options *opts,
1362 struct gcc_options *opts_set,
1363 const struct cl_decoded_option *decoded,
1364 unsigned int lang_mask, int kind ATTRIBUTE_UNUSED,
1366 const struct cl_option_handlers *handlers,
1367 diagnostic_context *dc)
1369 size_t scode = decoded->opt_index;
1370 const char *arg = decoded->arg;
1371 int value = decoded->value;
1372 enum opt_code code = (enum opt_code) scode;
1374 gcc_assert (decoded->canonical_option_num_elements <= 2);
1379 handle_param (opts, opts_set, loc, arg);
1384 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1385 unsigned int undoc_mask;
1388 if (lang_mask == CL_DRIVER)
1391 undoc_mask = ((opts->x_verbose_flag | opts->x_extra_warnings)
1394 /* First display any single language specific options. */
1395 for (i = 0; i < cl_lang_count; i++)
1397 (1U << i, (all_langs_mask & (~ (1U << i))) | undoc_mask, 0, opts,
1399 /* Next display any multi language specific options. */
1400 print_specific_help (0, undoc_mask, all_langs_mask, opts, lang_mask);
1401 /* Then display any remaining, non-language options. */
1402 for (i = CL_MIN_OPTION_CLASS; i <= CL_MAX_OPTION_CLASS; i <<= 1)
1404 print_specific_help (i, undoc_mask, 0, opts, lang_mask);
1405 opts->x_exit_after_options = true;
1409 case OPT__target_help:
1410 if (lang_mask == CL_DRIVER)
1413 print_specific_help (CL_TARGET, CL_UNDOCUMENTED, 0, opts, lang_mask);
1414 opts->x_exit_after_options = true;
1419 const char * a = arg;
1420 unsigned int include_flags = 0;
1421 /* Note - by default we include undocumented options when listing
1422 specific classes. If you only want to see documented options
1423 then add ",^undocumented" to the --help= option. E.g.:
1425 --help=target,^undocumented */
1426 unsigned int exclude_flags = 0;
1428 if (lang_mask == CL_DRIVER)
1431 /* Walk along the argument string, parsing each word in turn.
1433 arg = [^]{word}[,{arg}]
1434 word = {optimizers|target|warnings|undocumented|
1435 params|common|<language>} */
1440 const char * string;
1445 { "optimizers", CL_OPTIMIZATION },
1446 { "target", CL_TARGET },
1447 { "warnings", CL_WARNING },
1448 { "undocumented", CL_UNDOCUMENTED },
1449 { "params", CL_PARAMS },
1450 { "joined", CL_JOINED },
1451 { "separate", CL_SEPARATE },
1452 { "common", CL_COMMON },
1455 unsigned int * pflags;
1457 unsigned int lang_flag, specific_flag;
1464 pflags = & exclude_flags;
1467 pflags = & include_flags;
1469 comma = strchr (a, ',');
1480 /* Check to see if the string matches an option class name. */
1481 for (i = 0, specific_flag = 0; specifics[i].string != NULL; i++)
1482 if (strncasecmp (a, specifics[i].string, len) == 0)
1484 specific_flag = specifics[i].flag;
1488 /* Check to see if the string matches a language name.
1489 Note - we rely upon the alpha-sorted nature of the entries in
1490 the lang_names array, specifically that shorter names appear
1491 before their longer variants. (i.e. C before C++). That way
1492 when we are attempting to match --help=c for example we will
1493 match with C first and not C++. */
1494 for (i = 0, lang_flag = 0; i < cl_lang_count; i++)
1495 if (strncasecmp (a, lang_names[i], len) == 0)
1497 lang_flag = 1U << i;
1501 if (specific_flag != 0)
1504 * pflags |= specific_flag;
1507 /* The option's argument matches both the start of a
1508 language name and the start of an option class name.
1509 We have a special case for when the user has
1510 specified "--help=c", but otherwise we have to issue
1512 if (strncasecmp (a, "c", len) == 0)
1513 * pflags |= lang_flag;
1516 "--help argument %q.*s is ambiguous, "
1517 "please be more specific",
1521 else if (lang_flag != 0)
1522 * pflags |= lang_flag;
1525 "unrecognized argument to --help= option: %q.*s",
1534 print_specific_help (include_flags, exclude_flags, 0, opts,
1536 opts->x_exit_after_options = true;
1541 if (lang_mask == CL_DRIVER)
1544 opts->x_exit_after_options = true;
1547 case OPT_fsanitize_:
1548 case OPT_fsanitize_recover_:
1550 const char *p = arg;
1552 = code == OPT_fsanitize_ ? &opts->x_flag_sanitize
1553 : &opts->x_flag_sanitize_recover;
1558 const char *const name;
1563 { "address", SANITIZE_ADDRESS | SANITIZE_USER_ADDRESS,
1564 sizeof "address" - 1 },
1565 { "kernel-address", SANITIZE_ADDRESS | SANITIZE_KERNEL_ADDRESS,
1566 sizeof "kernel-address" - 1 },
1567 { "thread", SANITIZE_THREAD, sizeof "thread" - 1 },
1568 { "leak", SANITIZE_LEAK, sizeof "leak" - 1 },
1569 { "shift", SANITIZE_SHIFT, sizeof "shift" - 1 },
1570 { "integer-divide-by-zero", SANITIZE_DIVIDE,
1571 sizeof "integer-divide-by-zero" - 1 },
1572 { "undefined", SANITIZE_UNDEFINED, sizeof "undefined" - 1 },
1573 { "unreachable", SANITIZE_UNREACHABLE,
1574 sizeof "unreachable" - 1 },
1575 { "vla-bound", SANITIZE_VLA, sizeof "vla-bound" - 1 },
1576 { "return", SANITIZE_RETURN, sizeof "return" - 1 },
1577 { "null", SANITIZE_NULL, sizeof "null" - 1 },
1578 { "signed-integer-overflow", SANITIZE_SI_OVERFLOW,
1579 sizeof "signed-integer-overflow" -1 },
1580 { "bool", SANITIZE_BOOL, sizeof "bool" - 1 },
1581 { "enum", SANITIZE_ENUM, sizeof "enum" - 1 },
1582 { "float-divide-by-zero", SANITIZE_FLOAT_DIVIDE,
1583 sizeof "float-divide-by-zero" - 1 },
1584 { "float-cast-overflow", SANITIZE_FLOAT_CAST,
1585 sizeof "float-cast-overflow" - 1 },
1586 { "bounds", SANITIZE_BOUNDS, sizeof "bounds" - 1 },
1587 { "bounds-strict", SANITIZE_BOUNDS | SANITIZE_BOUNDS_STRICT,
1588 sizeof "bounds-strict" - 1 },
1589 { "alignment", SANITIZE_ALIGNMENT, sizeof "alignment" - 1 },
1590 { "nonnull-attribute", SANITIZE_NONNULL_ATTRIBUTE,
1591 sizeof "nonnull-attribute" - 1 },
1592 { "returns-nonnull-attribute",
1593 SANITIZE_RETURNS_NONNULL_ATTRIBUTE,
1594 sizeof "returns-nonnull-attribute" - 1 },
1595 { "object-size", SANITIZE_OBJECT_SIZE,
1596 sizeof "object-size" - 1 },
1597 { "vptr", SANITIZE_VPTR, sizeof "vptr" - 1 },
1598 { "all", ~0, sizeof "all" - 1 },
1605 comma = strchr (p, ',');
1616 /* Check to see if the string matches an option class name. */
1617 for (i = 0; spec[i].name != NULL; ++i)
1618 if (len == spec[i].len
1619 && memcmp (p, spec[i].name, len) == 0)
1621 /* Handle both -fsanitize and -fno-sanitize cases. */
1622 if (value && spec[i].flag == ~0U)
1624 if (code == OPT_fsanitize_)
1625 error_at (loc, "-fsanitize=all option is not valid");
1627 *flag |= ~(SANITIZE_USER_ADDRESS | SANITIZE_THREAD
1631 *flag |= spec[i].flag;
1633 *flag &= ~spec[i].flag;
1640 "unrecognized argument to -fsanitize%s= option: %q.*s",
1641 code == OPT_fsanitize_ ? "" : "-recover", (int) len, p);
1648 if (code != OPT_fsanitize_)
1651 /* Kernel ASan implies normal ASan but does not yet support
1653 if (opts->x_flag_sanitize & SANITIZE_KERNEL_ADDRESS)
1655 maybe_set_param_value (PARAM_ASAN_INSTRUMENTATION_WITH_CALL_THRESHOLD, 0,
1656 opts->x_param_values,
1657 opts_set->x_param_values);
1658 maybe_set_param_value (PARAM_ASAN_GLOBALS, 0,
1659 opts->x_param_values,
1660 opts_set->x_param_values);
1661 maybe_set_param_value (PARAM_ASAN_STACK, 0,
1662 opts->x_param_values,
1663 opts_set->x_param_values);
1664 maybe_set_param_value (PARAM_ASAN_USE_AFTER_RETURN, 0,
1665 opts->x_param_values,
1666 opts_set->x_param_values);
1672 case OPT_fasan_shadow_offset_:
1676 case OPT_fsanitize_recover:
1678 opts->x_flag_sanitize_recover
1679 |= SANITIZE_UNDEFINED | SANITIZE_NONDEFAULT;
1681 opts->x_flag_sanitize_recover
1682 &= ~(SANITIZE_UNDEFINED | SANITIZE_NONDEFAULT);
1689 /* Currently handled in a prescan. */
1693 dc->warning_as_error_requested = value;
1697 if (lang_mask == CL_DRIVER)
1700 enable_warning_as_error (arg, value, lang_mask, handlers,
1701 opts, opts_set, loc, dc);
1704 case OPT_Wlarger_than_:
1705 opts->x_larger_than_size = value;
1706 opts->x_warn_larger_than = value != -1;
1709 case OPT_Wfatal_errors:
1710 dc->fatal_errors = value;
1713 case OPT_Wframe_larger_than_:
1714 opts->x_frame_larger_than_size = value;
1715 opts->x_warn_frame_larger_than = value != -1;
1718 case OPT_Wstack_usage_:
1719 opts->x_warn_stack_usage = value;
1720 opts->x_flag_stack_usage_info = value != -1;
1723 case OPT_Wstrict_aliasing:
1724 set_Wstrict_aliasing (opts, value);
1727 case OPT_Wstrict_overflow:
1728 opts->x_warn_strict_overflow = (value
1729 ? (int) WARN_STRICT_OVERFLOW_CONDITIONAL
1733 case OPT_Wsystem_headers:
1734 dc->dc_warn_system_headers = value;
1738 opts->x_flag_gen_aux_info = 1;
1741 case OPT_auxbase_strip:
1743 char *tmp = xstrdup (arg);
1744 strip_off_ending (tmp, strlen (tmp));
1746 opts->x_aux_base_name = tmp;
1753 decode_d_option (arg, opts, loc, dc);
1756 case OPT_fcall_used_:
1757 case OPT_fcall_saved_:
1762 case OPT_fdbg_cnt_list:
1766 case OPT_fdebug_prefix_map_:
1770 case OPT_fdiagnostics_show_location_:
1771 diagnostic_prefixing_rule (dc) = (diagnostic_prefixing_rule_t) value;
1774 case OPT_fdiagnostics_show_caret:
1775 dc->show_caret = value;
1778 case OPT_fdiagnostics_color_:
1779 diagnostic_color_init (dc, value);
1782 case OPT_fdiagnostics_show_option:
1783 dc->show_option_requested = value;
1790 case OPT_ffast_math:
1791 set_fast_math_flags (opts, value);
1794 case OPT_funsafe_math_optimizations:
1795 set_unsafe_math_optimizations_flags (opts, value);
1802 case OPT_finline_limit_:
1803 set_param_value ("max-inline-insns-single", value / 2,
1804 opts->x_param_values, opts_set->x_param_values);
1805 set_param_value ("max-inline-insns-auto", value / 2,
1806 opts->x_param_values, opts_set->x_param_values);
1809 case OPT_finstrument_functions_exclude_function_list_:
1810 add_comma_separated_to_vector
1811 (&opts->x_flag_instrument_functions_exclude_functions, arg);
1814 case OPT_finstrument_functions_exclude_file_list_:
1815 add_comma_separated_to_vector
1816 (&opts->x_flag_instrument_functions_exclude_files, arg);
1819 case OPT_fmessage_length_:
1820 pp_set_line_maximum_length (dc->printer, value);
1821 diagnostic_set_caret_max_width (dc, value);
1825 case OPT_fopt_info_:
1833 #ifndef ACCEL_COMPILER
1834 case OPT_foffload_abi_:
1835 error_at (loc, "-foffload-abi option can be specified only for "
1836 "offload compiler");
1840 case OPT_fpack_struct_:
1841 if (value <= 0 || (value & (value - 1)) || value > 16)
1843 "structure alignment must be a small power of two, not %d",
1846 opts->x_initial_max_fld_align = value;
1850 case OPT_fplugin_arg_:
1854 case OPT_fprofile_use_:
1855 opts->x_profile_data_prefix = xstrdup (arg);
1856 opts->x_flag_profile_use = true;
1858 /* No break here - do -fprofile-use processing. */
1859 case OPT_fprofile_use:
1860 enable_fdo_optimizations (opts, opts_set, value);
1861 if (!opts_set->x_flag_profile_reorder_functions)
1862 opts->x_flag_profile_reorder_functions = value;
1863 /* Indirect call profiling should do all useful transformations
1864 speculative devirtualization does. */
1865 if (!opts_set->x_flag_devirtualize_speculatively
1866 && opts->x_flag_value_profile_transformations)
1867 opts->x_flag_devirtualize_speculatively = false;
1870 case OPT_fauto_profile_:
1871 opts->x_auto_profile_file = xstrdup (arg);
1872 opts->x_flag_auto_profile = true;
1874 /* No break here - do -fauto-profile processing. */
1875 case OPT_fauto_profile:
1876 enable_fdo_optimizations (opts, opts_set, value);
1877 if (!opts_set->x_flag_profile_correction)
1878 opts->x_flag_profile_correction = value;
1879 maybe_set_param_value (
1880 PARAM_EARLY_INLINER_MAX_ITERATIONS, 10,
1881 opts->x_param_values, opts_set->x_param_values);
1884 case OPT_fprofile_generate_:
1885 opts->x_profile_data_prefix = xstrdup (arg);
1887 /* No break here - do -fprofile-generate processing. */
1888 case OPT_fprofile_generate:
1889 if (!opts_set->x_profile_arc_flag)
1890 opts->x_profile_arc_flag = value;
1891 if (!opts_set->x_flag_profile_values)
1892 opts->x_flag_profile_values = value;
1893 if (!opts_set->x_flag_inline_functions)
1894 opts->x_flag_inline_functions = value;
1895 /* FIXME: Instrumentation we insert makes ipa-reference bitmaps
1896 quadratic. Disable the pass until better memory representation
1898 if (!opts_set->x_flag_ipa_reference)
1899 opts->x_flag_ipa_reference = false;
1902 case OPT_ftree_vectorize:
1903 if (!opts_set->x_flag_tree_loop_vectorize)
1904 opts->x_flag_tree_loop_vectorize = value;
1905 if (!opts_set->x_flag_tree_slp_vectorize)
1906 opts->x_flag_tree_slp_vectorize = value;
1908 case OPT_fshow_column:
1909 dc->show_column = value;
1912 case OPT_frandom_seed:
1913 /* The real switch is -fno-random-seed. */
1919 case OPT_frandom_seed_:
1923 case OPT_fsched_verbose_:
1924 #ifdef INSN_SCHEDULING
1925 /* Handled with Var in common.opt. */
1931 case OPT_fsched_stalled_insns_:
1932 opts->x_flag_sched_stalled_insns = value;
1933 if (opts->x_flag_sched_stalled_insns == 0)
1934 opts->x_flag_sched_stalled_insns = -1;
1937 case OPT_fsched_stalled_insns_dep_:
1938 opts->x_flag_sched_stalled_insns_dep = value;
1941 case OPT_fstack_check_:
1942 if (!strcmp (arg, "no"))
1943 opts->x_flag_stack_check = NO_STACK_CHECK;
1944 else if (!strcmp (arg, "generic"))
1945 /* This is the old stack checking method. */
1946 opts->x_flag_stack_check = STACK_CHECK_BUILTIN
1947 ? FULL_BUILTIN_STACK_CHECK
1948 : GENERIC_STACK_CHECK;
1949 else if (!strcmp (arg, "specific"))
1950 /* This is the new stack checking method. */
1951 opts->x_flag_stack_check = STACK_CHECK_BUILTIN
1952 ? FULL_BUILTIN_STACK_CHECK
1953 : STACK_CHECK_STATIC_BUILTIN
1954 ? STATIC_BUILTIN_STACK_CHECK
1955 : GENERIC_STACK_CHECK;
1957 warning_at (loc, 0, "unknown stack check parameter %qs", arg);
1960 case OPT_fstack_limit:
1961 /* The real switch is -fno-stack-limit. */
1967 case OPT_fstack_limit_register_:
1968 case OPT_fstack_limit_symbol_:
1972 case OPT_fstack_usage:
1973 opts->x_flag_stack_usage = value;
1974 opts->x_flag_stack_usage_info = value != 0;
1978 set_debug_level (NO_DEBUG, DEFAULT_GDB_EXTENSIONS, arg, opts, opts_set,
1983 set_debug_level (SDB_DEBUG, false, arg, opts, opts_set, loc);
1987 if (arg && strlen (arg) != 0)
1989 error_at (loc, "%<-gdwarf%s%> is ambiguous; "
1990 "use %<-gdwarf-%s%> for DWARF version "
1991 "or %<-gdwarf -g%s%> for debug level", arg, arg, arg);
1995 value = opts->x_dwarf_version;
1999 if (value < 2 || value > 5)
2000 error_at (loc, "dwarf version %d is not supported", value);
2002 opts->x_dwarf_version = value;
2003 set_debug_level (DWARF2_DEBUG, false, "", opts, opts_set, loc);
2006 case OPT_gsplit_dwarf:
2007 set_debug_level (NO_DEBUG, DEFAULT_GDB_EXTENSIONS, "", opts, opts_set,
2012 set_debug_level (NO_DEBUG, 2, arg, opts, opts_set, loc);
2017 set_debug_level (DBX_DEBUG, code == OPT_gstabs_, arg, opts, opts_set,
2022 set_debug_level (VMS_DEBUG, false, arg, opts, opts_set, loc);
2027 set_debug_level (XCOFF_DEBUG, code == OPT_gxcoff_, arg, opts, opts_set,
2033 /* Handled completely via specs. */
2036 case OPT_pedantic_errors:
2037 dc->pedantic_errors = 1;
2038 control_warning_option (OPT_Wpedantic, DK_ERROR, value,
2040 handlers, opts, opts_set,
2045 opts->x_flag_lto = value ? "" : NULL;
2049 dc->dc_inhibit_warnings = true;
2052 case OPT_fmax_errors_:
2053 dc->max_errors = value;
2056 case OPT_fuse_ld_bfd:
2057 case OPT_fuse_ld_gold:
2058 case OPT_fuse_linker_plugin:
2059 /* No-op. Used by the driver and passed to us because it starts with f.*/
2064 opts->x_flag_trapv = 0;
2069 opts->x_flag_wrapv = 0;
2073 opts->x_flag_ipa_icf_functions = value;
2074 opts->x_flag_ipa_icf_variables = value;
2078 /* If the flag was handled in a standard way, assume the lack of
2079 processing here is intentional. */
2080 gcc_assert (option_flag_var (scode, opts));
2084 common_handle_option_auto (opts, opts_set, decoded, lang_mask, kind,
2089 /* Handle --param NAME=VALUE. */
2091 handle_param (struct gcc_options *opts, struct gcc_options *opts_set,
2092 location_t loc, const char *carg)
2097 arg = xstrdup (carg);
2098 equal = strchr (arg, '=');
2100 error_at (loc, "%s: --param arguments should be of the form NAME=VALUE",
2104 value = integral_argument (equal + 1);
2106 error_at (loc, "invalid --param value %qs", equal + 1);
2110 set_param_value (arg, value,
2111 opts->x_param_values, opts_set->x_param_values);
2118 /* Used to set the level of strict aliasing warnings in OPTS,
2119 when no level is specified (i.e., when -Wstrict-aliasing, and not
2120 -Wstrict-aliasing=level was given).
2121 ONOFF is assumed to take value 1 when -Wstrict-aliasing is specified,
2122 and 0 otherwise. After calling this function, wstrict_aliasing will be
2123 set to the default value of -Wstrict_aliasing=level, currently 3. */
2125 set_Wstrict_aliasing (struct gcc_options *opts, int onoff)
2127 gcc_assert (onoff == 0 || onoff == 1);
2129 opts->x_warn_strict_aliasing = 3;
2131 opts->x_warn_strict_aliasing = 0;
2134 /* The following routines are useful in setting all the flags that
2135 -ffast-math and -fno-fast-math imply. */
2137 set_fast_math_flags (struct gcc_options *opts, int set)
2139 if (!opts->frontend_set_flag_unsafe_math_optimizations)
2141 opts->x_flag_unsafe_math_optimizations = set;
2142 set_unsafe_math_optimizations_flags (opts, set);
2144 if (!opts->frontend_set_flag_finite_math_only)
2145 opts->x_flag_finite_math_only = set;
2146 if (!opts->frontend_set_flag_errno_math)
2147 opts->x_flag_errno_math = !set;
2150 if (!opts->frontend_set_flag_signaling_nans)
2151 opts->x_flag_signaling_nans = 0;
2152 if (!opts->frontend_set_flag_rounding_math)
2153 opts->x_flag_rounding_math = 0;
2154 if (!opts->frontend_set_flag_cx_limited_range)
2155 opts->x_flag_cx_limited_range = 1;
2159 /* When -funsafe-math-optimizations is set the following
2160 flags are set as well. */
2162 set_unsafe_math_optimizations_flags (struct gcc_options *opts, int set)
2164 if (!opts->frontend_set_flag_trapping_math)
2165 opts->x_flag_trapping_math = !set;
2166 if (!opts->frontend_set_flag_signed_zeros)
2167 opts->x_flag_signed_zeros = !set;
2168 if (!opts->frontend_set_flag_associative_math)
2169 opts->x_flag_associative_math = set;
2170 if (!opts->frontend_set_flag_reciprocal_math)
2171 opts->x_flag_reciprocal_math = set;
2174 /* Return true iff flags in OPTS are set as if -ffast-math. */
2176 fast_math_flags_set_p (const struct gcc_options *opts)
2178 return (!opts->x_flag_trapping_math
2179 && opts->x_flag_unsafe_math_optimizations
2180 && opts->x_flag_finite_math_only
2181 && !opts->x_flag_signed_zeros
2182 && !opts->x_flag_errno_math);
2185 /* Return true iff flags are set as if -ffast-math but using the flags stored
2186 in the struct cl_optimization structure. */
2188 fast_math_flags_struct_set_p (struct cl_optimization *opt)
2190 return (!opt->x_flag_trapping_math
2191 && opt->x_flag_unsafe_math_optimizations
2192 && opt->x_flag_finite_math_only
2193 && !opt->x_flag_signed_zeros
2194 && !opt->x_flag_errno_math);
2197 /* Handle a debug output -g switch for options OPTS
2198 (OPTS_SET->x_write_symbols storing whether a debug type was passed
2199 explicitly), location LOC. EXTENDED is true or false to support
2200 extended output (2 is special and means "-ggdb" was given). */
2202 set_debug_level (enum debug_info_type type, int extended, const char *arg,
2203 struct gcc_options *opts, struct gcc_options *opts_set,
2206 opts->x_use_gnu_debug_info_extensions = extended;
2208 if (type == NO_DEBUG)
2210 if (opts->x_write_symbols == NO_DEBUG)
2212 opts->x_write_symbols = PREFERRED_DEBUGGING_TYPE;
2216 #ifdef DWARF2_DEBUGGING_INFO
2217 opts->x_write_symbols = DWARF2_DEBUG;
2218 #elif defined DBX_DEBUGGING_INFO
2219 opts->x_write_symbols = DBX_DEBUG;
2223 if (opts->x_write_symbols == NO_DEBUG)
2224 warning_at (loc, 0, "target system does not support debug output");
2229 /* Does it conflict with an already selected type? */
2230 if (opts_set->x_write_symbols != NO_DEBUG
2231 && opts->x_write_symbols != NO_DEBUG
2232 && type != opts->x_write_symbols)
2233 error_at (loc, "debug format %qs conflicts with prior selection",
2234 debug_type_names[type]);
2235 opts->x_write_symbols = type;
2236 opts_set->x_write_symbols = type;
2239 /* A debug flag without a level defaults to level 2.
2240 If off or at level 1, set it to level 2, but if already
2241 at level 3, don't lower it. */
2244 if (opts->x_debug_info_level < DINFO_LEVEL_NORMAL)
2245 opts->x_debug_info_level = DINFO_LEVEL_NORMAL;
2249 int argval = integral_argument (arg);
2251 error_at (loc, "unrecognised debug output level %qs", arg);
2252 else if (argval > 3)
2253 error_at (loc, "debug output level %qs is too high", arg);
2255 opts->x_debug_info_level = (enum debug_info_levels) argval;
2259 /* Arrange to dump core on error for diagnostic context DC. (The
2260 regular error message is still printed first, except in the case of
2264 setup_core_dumping (diagnostic_context *dc)
2267 signal (SIGABRT, SIG_DFL);
2269 #if defined(HAVE_SETRLIMIT)
2272 if (getrlimit (RLIMIT_CORE, &rlim) != 0)
2273 fatal_error (input_location, "getting core file size maximum limit: %m");
2274 rlim.rlim_cur = rlim.rlim_max;
2275 if (setrlimit (RLIMIT_CORE, &rlim) != 0)
2276 fatal_error (input_location,
2277 "setting core file size limit to maximum: %m");
2280 diagnostic_abort_on_error (dc);
2283 /* Parse a -d<ARG> command line switch for OPTS, location LOC,
2284 diagnostic context DC. */
2287 decode_d_option (const char *arg, struct gcc_options *opts,
2288 location_t loc, diagnostic_context *dc)
2296 opts->x_flag_debug_asm = 1;
2299 opts->x_flag_print_asm_name = 1;
2302 opts->x_flag_dump_rtl_in_asm = 1;
2303 opts->x_flag_print_asm_name = 1;
2306 opts->x_rtl_dump_and_exit = 1;
2308 case 'D': /* These are handled by the preprocessor. */
2315 setup_core_dumping (dc);
2318 opts->x_flag_dump_all_passed = true;
2322 warning_at (loc, 0, "unrecognized gcc debugging option: %c", c);
2327 /* Enable (or disable if VALUE is 0) a warning option ARG (language
2328 mask LANG_MASK, option handlers HANDLERS) as an error for option
2329 structures OPTS and OPTS_SET, diagnostic context DC (possibly
2330 NULL), location LOC. This is used by -Werror=. */
2333 enable_warning_as_error (const char *arg, int value, unsigned int lang_mask,
2334 const struct cl_option_handlers *handlers,
2335 struct gcc_options *opts,
2336 struct gcc_options *opts_set,
2337 location_t loc, diagnostic_context *dc)
2342 new_option = XNEWVEC (char, strlen (arg) + 2);
2343 new_option[0] = 'W';
2344 strcpy (new_option + 1, arg);
2345 option_index = find_opt (new_option, lang_mask);
2346 if (option_index == OPT_SPECIAL_unknown)
2348 error_at (loc, "-Werror=%s: no option -%s", arg, new_option);
2352 const diagnostic_t kind = value ? DK_ERROR : DK_WARNING;
2354 control_warning_option (option_index, (int) kind, value,
2356 handlers, opts, opts_set, dc);
2361 /* Return malloced memory for the name of the option OPTION_INDEX
2362 which enabled a diagnostic (context CONTEXT), originally of type
2363 ORIG_DIAG_KIND but possibly converted to DIAG_KIND by options such
2367 option_name (diagnostic_context *context, int option_index,
2368 diagnostic_t orig_diag_kind, diagnostic_t diag_kind)
2372 /* A warning classified as an error. */
2373 if ((orig_diag_kind == DK_WARNING || orig_diag_kind == DK_PEDWARN)
2374 && diag_kind == DK_ERROR)
2375 return concat (cl_options[OPT_Werror_].opt_text,
2376 /* Skip over "-W". */
2377 cl_options[option_index].opt_text + 2,
2379 /* A warning with option. */
2381 return xstrdup (cl_options[option_index].opt_text);
2383 /* A warning without option classified as an error. */
2384 else if ((orig_diag_kind == DK_WARNING || orig_diag_kind == DK_PEDWARN
2385 || diag_kind == DK_WARNING)
2386 && context->warning_as_error_requested)
2387 return xstrdup (cl_options[OPT_Werror].opt_text);