1 /* Command line option handling.
2 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
3 Free Software Foundation, Inc.
4 Contributed by Neil Booth.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
25 #include "coretypes.h"
26 #include "tm.h" /* For STACK_CHECK_BUILTIN,
27 STACK_CHECK_STATIC_BUILTIN, DEFAULT_GDB_EXTENSIONS,
28 DWARF2_DEBUGGING_INFO and DBX_DEBUGGING_INFO. */
33 #include "diagnostic.h"
34 #include "opts-diagnostic.h"
35 #include "insn-attr-common.h"
36 #include "common/common-target.h"
38 /* Indexed by enum debug_info_type. */
39 const char *const debug_type_names[] =
41 "none", "stabs", "coff", "dwarf-2", "xcoff", "vms"
44 /* Parse the -femit-struct-debug-detailed option value
45 and set the flag variables. */
47 #define MATCH( prefix, string ) \
48 ((strncmp (prefix, string, sizeof prefix - 1) == 0) \
49 ? ((string += sizeof prefix - 1), 1) : 0)
52 set_struct_debug_option (struct gcc_options *opts, location_t loc,
55 /* various labels for comparison */
56 static const char dfn_lbl[] = "dfn:", dir_lbl[] = "dir:", ind_lbl[] = "ind:";
57 static const char ord_lbl[] = "ord:", gen_lbl[] = "gen:";
58 static const char none_lbl[] = "none", any_lbl[] = "any";
59 static const char base_lbl[] = "base", sys_lbl[] = "sys";
61 enum debug_struct_file files = DINFO_STRUCT_FILE_ANY;
62 /* Default is to apply to as much as possible. */
63 enum debug_info_usage usage = DINFO_USAGE_NUM_ENUMS;
67 if (MATCH (dfn_lbl, spec))
68 usage = DINFO_USAGE_DFN;
69 else if (MATCH (dir_lbl, spec))
70 usage = DINFO_USAGE_DIR_USE;
71 else if (MATCH (ind_lbl, spec))
72 usage = DINFO_USAGE_IND_USE;
74 /* Generics or not? */
75 if (MATCH (ord_lbl, spec))
77 else if (MATCH (gen_lbl, spec))
80 /* What allowable environment? */
81 if (MATCH (none_lbl, spec))
82 files = DINFO_STRUCT_FILE_NONE;
83 else if (MATCH (any_lbl, spec))
84 files = DINFO_STRUCT_FILE_ANY;
85 else if (MATCH (sys_lbl, spec))
86 files = DINFO_STRUCT_FILE_SYS;
87 else if (MATCH (base_lbl, spec))
88 files = DINFO_STRUCT_FILE_BASE;
91 "argument %qs to %<-femit-struct-debug-detailed%> "
95 /* Effect the specification. */
96 if (usage == DINFO_USAGE_NUM_ENUMS)
100 opts->x_debug_struct_ordinary[DINFO_USAGE_DFN] = files;
101 opts->x_debug_struct_ordinary[DINFO_USAGE_DIR_USE] = files;
102 opts->x_debug_struct_ordinary[DINFO_USAGE_IND_USE] = files;
106 opts->x_debug_struct_generic[DINFO_USAGE_DFN] = files;
107 opts->x_debug_struct_generic[DINFO_USAGE_DIR_USE] = files;
108 opts->x_debug_struct_generic[DINFO_USAGE_IND_USE] = files;
114 opts->x_debug_struct_ordinary[usage] = files;
116 opts->x_debug_struct_generic[usage] = files;
120 set_struct_debug_option (opts, loc, spec+1);
123 /* No more -femit-struct-debug-detailed specifications.
127 "argument %qs to %<-femit-struct-debug-detailed%> unknown",
129 if (opts->x_debug_struct_ordinary[DINFO_USAGE_DIR_USE]
130 < opts->x_debug_struct_ordinary[DINFO_USAGE_IND_USE]
131 || opts->x_debug_struct_generic[DINFO_USAGE_DIR_USE]
132 < opts->x_debug_struct_generic[DINFO_USAGE_IND_USE])
134 "%<-femit-struct-debug-detailed=dir:...%> must allow "
135 "at least as much as "
136 "%<-femit-struct-debug-detailed=ind:...%>");
140 /* Handle -ftree-vectorizer-verbose=VAL for options OPTS. */
143 vect_set_verbosity_level (struct gcc_options *opts, int val)
145 if (val < MAX_VERBOSITY_LEVEL)
146 opts->x_user_vect_verbosity_level = (enum vect_verbosity_levels) val;
148 opts->x_user_vect_verbosity_level
149 = (enum vect_verbosity_levels) (MAX_VERBOSITY_LEVEL - 1);
153 /* Strip off a legitimate source ending from the input string NAME of
154 length LEN. Rather than having to know the names used by all of
155 our front ends, we strip off an ending of a period followed by
156 up to five characters. (Java uses ".class".) */
159 strip_off_ending (char *name, int len)
162 for (i = 2; i < 6 && len > i; i++)
164 if (name[len - i] == '.')
166 name[len - i] = '\0';
172 /* Find the base name of a path, stripping off both directories and
173 a single final extension. */
175 base_of_path (const char *path, const char **base_out)
177 const char *base = path;
179 const char *p = path;
183 if (IS_DIR_SEPARATOR(c))
198 /* What to print when a switch has no documentation. */
199 static const char undocumented_msg[] = N_("This switch lacks documentation");
201 typedef char *char_p; /* For DEF_VEC_P. */
203 DEF_VEC_ALLOC_P(char_p,heap);
205 static void handle_param (struct gcc_options *opts,
206 struct gcc_options *opts_set, location_t loc,
208 static void set_debug_level (enum debug_info_type type, int extended,
209 const char *arg, struct gcc_options *opts,
210 struct gcc_options *opts_set,
212 static void set_fast_math_flags (struct gcc_options *opts, int set);
213 static void decode_d_option (const char *arg, struct gcc_options *opts,
214 location_t loc, diagnostic_context *dc);
215 static void set_unsafe_math_optimizations_flags (struct gcc_options *opts,
217 static void enable_warning_as_error (const char *arg, int value,
218 unsigned int lang_mask,
219 const struct cl_option_handlers *handlers,
220 struct gcc_options *opts,
221 struct gcc_options *opts_set,
223 diagnostic_context *dc);
225 /* Handle a back-end option; arguments and return value as for
229 target_handle_option (struct gcc_options *opts,
230 struct gcc_options *opts_set,
231 const struct cl_decoded_option *decoded,
232 unsigned int lang_mask ATTRIBUTE_UNUSED, int kind,
234 const struct cl_option_handlers *handlers ATTRIBUTE_UNUSED,
235 diagnostic_context *dc)
237 gcc_assert (dc == global_dc);
238 gcc_assert (kind == DK_UNSPECIFIED);
239 return targetm_common.handle_option (opts, opts_set, decoded, loc);
242 /* Add comma-separated strings to a char_p vector. */
245 add_comma_separated_to_vector (void **pvec, const char *arg)
251 VEC(char_p,heap) *vec = (VEC(char_p,heap) *) *pvec;
253 /* We never free this string. */
266 VEC_safe_push (char_p, heap, vec, token_start);
269 if (*r == '\\' && r[1] == ',')
277 if (*token_start != '\0')
278 VEC_safe_push (char_p, heap, vec, token_start);
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 *opts = global_options_init;
291 memset (opts_set, 0, sizeof (*opts_set));
293 opts->x_param_values = XNEWVEC (int, num_params);
294 opts_set->x_param_values = XCNEWVEC (int, num_params);
295 init_param_values (opts->x_param_values);
297 /* Initialize whether `char' is signed. */
298 opts->x_flag_signed_char = DEFAULT_SIGNED_CHAR;
299 /* Set this to a special "uninitialized" value. The actual default
300 is set after target options have been processed. */
301 opts->x_flag_short_enums = 2;
303 /* Initialize target_flags before default_options_optimization
304 so the latter can modify it. */
305 opts->x_target_flags = targetm_common.default_target_flags;
307 /* Some targets have ABI-specified unwind tables. */
308 opts->x_flag_unwind_tables = targetm_common.unwind_tables_default;
310 /* Some targets have other target-specific initialization. */
311 targetm_common.option_init_struct (opts);
314 /* If indicated by the optimization level LEVEL (-Os if SIZE is set,
315 -Ofast if FAST is set), apply the option DEFAULT_OPT to OPTS and
316 OPTS_SET, diagnostic context DC, location LOC, with language mask
317 LANG_MASK and option handlers HANDLERS. */
320 maybe_default_option (struct gcc_options *opts,
321 struct gcc_options *opts_set,
322 const struct default_options *default_opt,
323 int level, bool size, bool fast,
324 unsigned int lang_mask,
325 const struct cl_option_handlers *handlers,
327 diagnostic_context *dc)
329 const struct cl_option *option = &cl_options[default_opt->opt_index];
333 gcc_assert (level == 2);
335 gcc_assert (level == 3);
337 switch (default_opt->levels)
343 case OPT_LEVELS_0_ONLY:
344 enabled = (level == 0);
347 case OPT_LEVELS_1_PLUS:
348 enabled = (level >= 1);
351 case OPT_LEVELS_1_PLUS_SPEED_ONLY:
352 enabled = (level >= 1 && !size);
355 case OPT_LEVELS_2_PLUS:
356 enabled = (level >= 2);
359 case OPT_LEVELS_2_PLUS_SPEED_ONLY:
360 enabled = (level >= 2 && !size);
363 case OPT_LEVELS_3_PLUS:
364 enabled = (level >= 3);
367 case OPT_LEVELS_3_PLUS_AND_SIZE:
368 enabled = (level >= 3 || size);
371 case OPT_LEVELS_SIZE:
375 case OPT_LEVELS_FAST:
379 case OPT_LEVELS_NONE:
385 handle_generated_option (opts, opts_set, default_opt->opt_index,
386 default_opt->arg, default_opt->value,
387 lang_mask, DK_UNSPECIFIED, loc,
389 else if (default_opt->arg == NULL
390 && !option->cl_reject_negative)
391 handle_generated_option (opts, opts_set, default_opt->opt_index,
392 default_opt->arg, !default_opt->value,
393 lang_mask, DK_UNSPECIFIED, loc,
397 /* As indicated by the optimization level LEVEL (-Os if SIZE is set,
398 -Ofast if FAST is set), apply the options in array DEFAULT_OPTS to
399 OPTS and OPTS_SET, diagnostic context DC, location LOC, with
400 language mask LANG_MASK and option handlers HANDLERS. */
403 maybe_default_options (struct gcc_options *opts,
404 struct gcc_options *opts_set,
405 const struct default_options *default_opts,
406 int level, bool size, bool fast,
407 unsigned int lang_mask,
408 const struct cl_option_handlers *handlers,
410 diagnostic_context *dc)
414 for (i = 0; default_opts[i].levels != OPT_LEVELS_NONE; i++)
415 maybe_default_option (opts, opts_set, &default_opts[i],
416 level, size, fast, lang_mask, handlers, loc, dc);
419 /* Table of options enabled by default at different levels. */
421 static const struct default_options default_options_table[] =
423 /* -O1 optimizations. */
424 { OPT_LEVELS_1_PLUS, OPT_fdefer_pop, NULL, 1 },
426 { OPT_LEVELS_1_PLUS, OPT_fdelayed_branch, NULL, 1 },
428 { OPT_LEVELS_1_PLUS, OPT_fguess_branch_probability, NULL, 1 },
429 { OPT_LEVELS_1_PLUS, OPT_fcprop_registers, NULL, 1 },
430 { OPT_LEVELS_1_PLUS, OPT_fforward_propagate, NULL, 1 },
431 { OPT_LEVELS_1_PLUS, OPT_fif_conversion, NULL, 1 },
432 { OPT_LEVELS_1_PLUS, OPT_fif_conversion2, NULL, 1 },
433 { OPT_LEVELS_1_PLUS, OPT_fipa_pure_const, NULL, 1 },
434 { OPT_LEVELS_1_PLUS, OPT_fipa_reference, NULL, 1 },
435 { OPT_LEVELS_1_PLUS, OPT_fipa_profile, NULL, 1 },
436 { OPT_LEVELS_1_PLUS, OPT_fmerge_constants, NULL, 1 },
437 { OPT_LEVELS_1_PLUS, OPT_fshrink_wrap, NULL, 1 },
438 { OPT_LEVELS_1_PLUS, OPT_fsplit_wide_types, NULL, 1 },
439 { OPT_LEVELS_1_PLUS, OPT_ftree_ccp, NULL, 1 },
440 { OPT_LEVELS_1_PLUS, OPT_ftree_bit_ccp, NULL, 1 },
441 { OPT_LEVELS_1_PLUS, OPT_ftree_dce, NULL, 1 },
442 { OPT_LEVELS_1_PLUS, OPT_ftree_dominator_opts, NULL, 1 },
443 { OPT_LEVELS_1_PLUS, OPT_ftree_dse, NULL, 1 },
444 { OPT_LEVELS_1_PLUS, OPT_ftree_ter, NULL, 1 },
445 { OPT_LEVELS_1_PLUS, OPT_ftree_sra, NULL, 1 },
446 { OPT_LEVELS_1_PLUS, OPT_ftree_copyrename, NULL, 1 },
447 { OPT_LEVELS_1_PLUS, OPT_ftree_fre, NULL, 1 },
448 { OPT_LEVELS_1_PLUS, OPT_ftree_copy_prop, NULL, 1 },
449 { OPT_LEVELS_1_PLUS, OPT_ftree_sink, NULL, 1 },
450 { OPT_LEVELS_1_PLUS, OPT_ftree_ch, NULL, 1 },
451 { OPT_LEVELS_1_PLUS, OPT_fcombine_stack_adjustments, NULL, 1 },
452 { OPT_LEVELS_1_PLUS, OPT_fcompare_elim, NULL, 1 },
454 /* -O2 optimizations. */
455 { OPT_LEVELS_2_PLUS, OPT_finline_small_functions, NULL, 1 },
456 { OPT_LEVELS_2_PLUS, OPT_findirect_inlining, NULL, 1 },
457 { OPT_LEVELS_2_PLUS, OPT_fpartial_inlining, NULL, 1 },
458 { OPT_LEVELS_2_PLUS, OPT_fthread_jumps, NULL, 1 },
459 { OPT_LEVELS_2_PLUS, OPT_fcrossjumping, NULL, 1 },
460 { OPT_LEVELS_2_PLUS, OPT_foptimize_sibling_calls, NULL, 1 },
461 { OPT_LEVELS_2_PLUS, OPT_fcse_follow_jumps, NULL, 1 },
462 { OPT_LEVELS_2_PLUS, OPT_fgcse, NULL, 1 },
463 { OPT_LEVELS_2_PLUS, OPT_fexpensive_optimizations, NULL, 1 },
464 { OPT_LEVELS_2_PLUS, OPT_frerun_cse_after_loop, NULL, 1 },
465 { OPT_LEVELS_2_PLUS, OPT_fcaller_saves, NULL, 1 },
466 { OPT_LEVELS_2_PLUS, OPT_fpeephole2, NULL, 1 },
467 #ifdef INSN_SCHEDULING
468 /* Only run the pre-regalloc scheduling pass if optimizing for speed. */
469 { OPT_LEVELS_2_PLUS_SPEED_ONLY, OPT_fschedule_insns, NULL, 1 },
470 { OPT_LEVELS_2_PLUS, OPT_fschedule_insns2, NULL, 1 },
472 { OPT_LEVELS_2_PLUS, OPT_fregmove, NULL, 1 },
473 { OPT_LEVELS_2_PLUS, OPT_fstrict_aliasing, NULL, 1 },
474 { OPT_LEVELS_2_PLUS, OPT_fstrict_overflow, NULL, 1 },
475 { OPT_LEVELS_2_PLUS, OPT_freorder_blocks, NULL, 1 },
476 { OPT_LEVELS_2_PLUS, OPT_freorder_functions, NULL, 1 },
477 { OPT_LEVELS_2_PLUS, OPT_ftree_vrp, NULL, 1 },
478 { OPT_LEVELS_2_PLUS, OPT_ftree_builtin_call_dce, NULL, 1 },
479 { OPT_LEVELS_2_PLUS, OPT_ftree_pre, NULL, 1 },
480 { OPT_LEVELS_2_PLUS, OPT_ftree_switch_conversion, NULL, 1 },
481 { OPT_LEVELS_2_PLUS, OPT_fipa_cp, NULL, 1 },
482 { OPT_LEVELS_2_PLUS, OPT_fdevirtualize, NULL, 1 },
483 { OPT_LEVELS_2_PLUS, OPT_fipa_sra, NULL, 1 },
484 { OPT_LEVELS_2_PLUS, OPT_falign_loops, NULL, 1 },
485 { OPT_LEVELS_2_PLUS, OPT_falign_jumps, NULL, 1 },
486 { OPT_LEVELS_2_PLUS, OPT_falign_labels, NULL, 1 },
487 { OPT_LEVELS_2_PLUS, OPT_falign_functions, NULL, 1 },
488 { OPT_LEVELS_2_PLUS, OPT_ftree_tail_merge, NULL, 1 },
489 { OPT_LEVELS_2_PLUS_SPEED_ONLY, OPT_foptimize_strlen, NULL, 1 },
491 /* -O3 optimizations. */
492 { OPT_LEVELS_3_PLUS, OPT_ftree_loop_distribute_patterns, NULL, 1 },
493 { OPT_LEVELS_3_PLUS, OPT_fpredictive_commoning, NULL, 1 },
494 /* Inlining of functions reducing size is a good idea with -Os
495 regardless of them being declared inline. */
496 { OPT_LEVELS_3_PLUS_AND_SIZE, OPT_finline_functions, NULL, 1 },
497 { OPT_LEVELS_1_PLUS, OPT_finline_functions_called_once, NULL, 1 },
498 { OPT_LEVELS_3_PLUS, OPT_funswitch_loops, NULL, 1 },
499 { OPT_LEVELS_3_PLUS, OPT_fgcse_after_reload, NULL, 1 },
500 { OPT_LEVELS_3_PLUS, OPT_ftree_vectorize, NULL, 1 },
501 { OPT_LEVELS_3_PLUS, OPT_fipa_cp_clone, NULL, 1 },
503 /* -Ofast adds optimizations to -O3. */
504 { OPT_LEVELS_FAST, OPT_ffast_math, NULL, 1 },
506 { OPT_LEVELS_NONE, 0, NULL, 0 }
509 /* Default the options in OPTS and OPTS_SET based on the optimization
510 settings in DECODED_OPTIONS and DECODED_OPTIONS_COUNT. */
512 default_options_optimization (struct gcc_options *opts,
513 struct gcc_options *opts_set,
514 struct cl_decoded_option *decoded_options,
515 unsigned int decoded_options_count,
517 unsigned int lang_mask,
518 const struct cl_option_handlers *handlers,
519 diagnostic_context *dc)
524 /* Scan to see what optimization level has been specified. That will
525 determine the default value of many flags. */
526 for (i = 1; i < decoded_options_count; i++)
528 struct cl_decoded_option *opt = &decoded_options[i];
529 switch (opt->opt_index)
532 if (*opt->arg == '\0')
534 opts->x_optimize = 1;
535 opts->x_optimize_size = 0;
536 opts->x_optimize_fast = 0;
540 const int optimize_val = integral_argument (opt->arg);
541 if (optimize_val == -1)
543 "argument to %qs should be a non-negative integer",
547 opts->x_optimize = optimize_val;
548 if ((unsigned int) opts->x_optimize > 255)
549 opts->x_optimize = 255;
550 opts->x_optimize_size = 0;
551 opts->x_optimize_fast = 0;
557 opts->x_optimize_size = 1;
559 /* Optimizing for size forces optimize to be 2. */
560 opts->x_optimize = 2;
561 opts->x_optimize_fast = 0;
565 /* -Ofast only adds flags to -O3. */
566 opts->x_optimize_size = 0;
567 opts->x_optimize = 3;
568 opts->x_optimize_fast = 1;
572 /* Ignore other options in this prescan. */
577 maybe_default_options (opts, opts_set, default_options_table,
578 opts->x_optimize, opts->x_optimize_size,
579 opts->x_optimize_fast, lang_mask, handlers, loc, dc);
581 /* -O2 param settings. */
582 opt2 = (opts->x_optimize >= 2);
584 /* Track fields in field-sensitive alias analysis. */
585 maybe_set_param_value
586 (PARAM_MAX_FIELDS_FOR_FIELD_SENSITIVE,
587 opt2 ? 100 : default_param_value (PARAM_MAX_FIELDS_FOR_FIELD_SENSITIVE),
588 opts->x_param_values, opts_set->x_param_values);
590 /* For -O1 only do loop invariant motion for very small loops. */
591 maybe_set_param_value
592 (PARAM_LOOP_INVARIANT_MAX_BBS_IN_LOOP,
593 opt2 ? default_param_value (PARAM_LOOP_INVARIANT_MAX_BBS_IN_LOOP) : 1000,
594 opts->x_param_values, opts_set->x_param_values);
596 if (opts->x_optimize_size)
597 /* We want to crossjump as much as possible. */
598 maybe_set_param_value (PARAM_MIN_CROSSJUMP_INSNS, 1,
599 opts->x_param_values, opts_set->x_param_values);
601 maybe_set_param_value (PARAM_MIN_CROSSJUMP_INSNS,
602 default_param_value (PARAM_MIN_CROSSJUMP_INSNS),
603 opts->x_param_values, opts_set->x_param_values);
605 /* Allow default optimizations to be specified on a per-machine basis. */
606 maybe_default_options (opts, opts_set,
607 targetm_common.option_optimization_table,
608 opts->x_optimize, opts->x_optimize_size,
609 opts->x_optimize_fast, lang_mask, handlers, loc, dc);
612 /* After all options at LOC have been read into OPTS and OPTS_SET,
613 finalize settings of those options and diagnose incompatible
616 finish_options (struct gcc_options *opts, struct gcc_options *opts_set,
619 enum unwind_info_type ui_except;
621 if (opts->x_dump_base_name && ! IS_ABSOLUTE_PATH (opts->x_dump_base_name))
623 /* First try to make OPTS->X_DUMP_BASE_NAME relative to the
624 OPTS->X_DUMP_DIR_NAME directory. Then try to make
625 OPTS->X_DUMP_BASE_NAME relative to the OPTS->X_AUX_BASE_NAME
626 directory, typically the directory to contain the object
628 if (opts->x_dump_dir_name)
629 opts->x_dump_base_name = concat (opts->x_dump_dir_name,
630 opts->x_dump_base_name, NULL);
631 else if (opts->x_aux_base_name
632 && strcmp (opts->x_aux_base_name, HOST_BIT_BUCKET) != 0)
634 const char *aux_base;
636 base_of_path (opts->x_aux_base_name, &aux_base);
637 if (opts->x_aux_base_name != aux_base)
639 int dir_len = aux_base - opts->x_aux_base_name;
640 char *new_dump_base_name =
641 XNEWVEC (char, strlen (opts->x_dump_base_name) + dir_len + 1);
643 /* Copy directory component from OPTS->X_AUX_BASE_NAME. */
644 memcpy (new_dump_base_name, opts->x_aux_base_name, dir_len);
645 /* Append existing OPTS->X_DUMP_BASE_NAME. */
646 strcpy (new_dump_base_name + dir_len, opts->x_dump_base_name);
647 opts->x_dump_base_name = new_dump_base_name;
652 /* Handle related options for unit-at-a-time, toplevel-reorder, and
654 if (!opts->x_flag_unit_at_a_time)
656 if (opts->x_flag_section_anchors && opts_set->x_flag_section_anchors)
657 error_at (loc, "section anchors must be disabled when unit-at-a-time "
659 opts->x_flag_section_anchors = 0;
660 if (opts->x_flag_toplevel_reorder == 1)
661 error_at (loc, "toplevel reorder must be disabled when unit-at-a-time "
663 opts->x_flag_toplevel_reorder = 0;
666 /* -Wmissing-noreturn is alias for -Wsuggest-attribute=noreturn. */
667 if (opts->x_warn_missing_noreturn)
668 opts->x_warn_suggest_attribute_noreturn = true;
670 /* Unless the user has asked for section anchors, we disable toplevel
671 reordering at -O0 to disable transformations that might be surprising
672 to end users and to get -fno-toplevel-reorder tested. */
673 if (!opts->x_optimize
674 && opts->x_flag_toplevel_reorder == 2
675 && !(opts->x_flag_section_anchors && opts_set->x_flag_section_anchors))
677 opts->x_flag_toplevel_reorder = 0;
678 opts->x_flag_section_anchors = 0;
680 if (!opts->x_flag_toplevel_reorder)
682 if (opts->x_flag_section_anchors && opts_set->x_flag_section_anchors)
683 error_at (loc, "section anchors must be disabled when toplevel reorder"
685 opts->x_flag_section_anchors = 0;
688 if (!opts->x_flag_opts_finished)
690 if (opts->x_flag_pie)
691 opts->x_flag_pic = opts->x_flag_pie;
692 if (opts->x_flag_pic && !opts->x_flag_pie)
693 opts->x_flag_shlib = 1;
694 opts->x_flag_opts_finished = true;
697 if (opts->x_optimize == 0)
699 /* Inlining does not work if not optimizing,
700 so force it not to be done. */
701 opts->x_warn_inline = 0;
702 opts->x_flag_no_inline = 1;
705 /* The optimization to partition hot and cold basic blocks into separate
706 sections of the .o and executable files does not work (currently)
707 with exception handling. This is because there is no support for
708 generating unwind info. If opts->x_flag_exceptions is turned on
709 we need to turn off the partitioning optimization. */
711 ui_except = targetm_common.except_unwind_info (opts);
713 if (opts->x_flag_exceptions
714 && opts->x_flag_reorder_blocks_and_partition
715 && (ui_except == UI_SJLJ || ui_except == UI_TARGET))
718 "-freorder-blocks-and-partition does not work "
719 "with exceptions on this architecture");
720 opts->x_flag_reorder_blocks_and_partition = 0;
721 opts->x_flag_reorder_blocks = 1;
724 /* If user requested unwind info, then turn off the partitioning
727 if (opts->x_flag_unwind_tables
728 && !targetm_common.unwind_tables_default
729 && opts->x_flag_reorder_blocks_and_partition
730 && (ui_except == UI_SJLJ || ui_except == UI_TARGET))
733 "-freorder-blocks-and-partition does not support "
734 "unwind info on this architecture");
735 opts->x_flag_reorder_blocks_and_partition = 0;
736 opts->x_flag_reorder_blocks = 1;
739 /* If the target requested unwind info, then turn off the partitioning
740 optimization with a different message. Likewise, if the target does not
741 support named sections. */
743 if (opts->x_flag_reorder_blocks_and_partition
744 && (!targetm_common.have_named_sections
745 || (opts->x_flag_unwind_tables
746 && targetm_common.unwind_tables_default
747 && (ui_except == UI_SJLJ || ui_except == UI_TARGET))))
750 "-freorder-blocks-and-partition does not work "
751 "on this architecture");
752 opts->x_flag_reorder_blocks_and_partition = 0;
753 opts->x_flag_reorder_blocks = 1;
756 if (opts->x_flag_reorder_blocks_and_partition
757 && !opts_set->x_flag_reorder_functions)
758 opts->x_flag_reorder_functions = 1;
760 /* Pipelining of outer loops is only possible when general pipelining
761 capabilities are requested. */
762 if (!opts->x_flag_sel_sched_pipelining)
763 opts->x_flag_sel_sched_pipelining_outer_loops = 0;
765 if (opts->x_flag_conserve_stack)
767 maybe_set_param_value (PARAM_LARGE_STACK_FRAME, 100,
768 opts->x_param_values, opts_set->x_param_values);
769 maybe_set_param_value (PARAM_STACK_FRAME_GROWTH, 40,
770 opts->x_param_values, opts_set->x_param_values);
773 if (opts->x_flag_lto)
776 opts->x_flag_generate_lto = 1;
778 /* When generating IL, do not operate in whole-program mode.
779 Otherwise, symbols will be privatized too early, causing link
781 opts->x_flag_whole_program = 0;
783 error_at (loc, "LTO support has not been enabled in this configuration");
785 if (!opts->x_flag_fat_lto_objects && !HAVE_LTO_PLUGIN)
786 error_at (loc, "-fno-fat-lto-objects are supported only with linker plugin.");
788 error_at (loc, "LTO is currently not supported with transactional memory");
790 if ((opts->x_flag_lto_partition_balanced != 0) + (opts->x_flag_lto_partition_1to1 != 0)
791 + (opts->x_flag_lto_partition_none != 0) >= 1)
793 if ((opts->x_flag_lto_partition_balanced != 0)
794 + (opts->x_flag_lto_partition_1to1 != 0)
795 + (opts->x_flag_lto_partition_none != 0) > 1)
796 error_at (loc, "only one -flto-partition value can be specified");
799 /* We initialize opts->x_flag_split_stack to -1 so that targets can set a
800 default value if they choose based on other options. */
801 if (opts->x_flag_split_stack == -1)
802 opts->x_flag_split_stack = 0;
803 else if (opts->x_flag_split_stack)
805 if (!targetm_common.supports_split_stack (true, opts))
807 error_at (loc, "%<-fsplit-stack%> is not supported by "
808 "this compiler configuration");
809 opts->x_flag_split_stack = 0;
813 /* Set PARAM_MAX_STORES_TO_SINK to 0 if either vectorization or if-conversion
815 if (!opts->x_flag_tree_vectorize || !opts->x_flag_tree_loop_if_convert)
816 maybe_set_param_value (PARAM_MAX_STORES_TO_SINK, 0,
817 opts->x_param_values, opts_set->x_param_values);
819 /* This replaces set_Wunused. */
820 if (opts->x_warn_unused_function == -1)
821 opts->x_warn_unused_function = opts->x_warn_unused;
822 if (opts->x_warn_unused_label == -1)
823 opts->x_warn_unused_label = opts->x_warn_unused;
824 /* Wunused-parameter is enabled if both -Wunused -Wextra are enabled. */
825 if (opts->x_warn_unused_parameter == -1)
826 opts->x_warn_unused_parameter = (opts->x_warn_unused
827 && opts->x_extra_warnings);
828 if (opts->x_warn_unused_variable == -1)
829 opts->x_warn_unused_variable = opts->x_warn_unused;
830 /* Wunused-but-set-parameter is enabled if both -Wunused -Wextra are
832 if (opts->x_warn_unused_but_set_parameter == -1)
833 opts->x_warn_unused_but_set_parameter = (opts->x_warn_unused
834 && opts->x_extra_warnings);
835 if (opts->x_warn_unused_but_set_variable == -1)
836 opts->x_warn_unused_but_set_variable = opts->x_warn_unused;
837 if (opts->x_warn_unused_value == -1)
838 opts->x_warn_unused_value = opts->x_warn_unused;
840 /* This replaces set_Wextra. */
841 if (opts->x_warn_uninitialized == -1)
842 opts->x_warn_uninitialized = opts->x_extra_warnings;
845 #define LEFT_COLUMN 27
847 /* Output ITEM, of length ITEM_WIDTH, in the left column,
848 followed by word-wrapped HELP in a second column. */
850 wrap_help (const char *help,
852 unsigned int item_width,
853 unsigned int columns)
855 unsigned int col_width = LEFT_COLUMN;
856 unsigned int remaining, room, len;
858 remaining = strlen (help);
862 room = columns - 3 - MAX (col_width, item_width);
871 for (i = 0; help[i]; i++)
873 if (i >= room && len != remaining)
877 else if ((help[i] == '-' || help[i] == '/')
878 && help[i + 1] != ' '
879 && i > 0 && ISALPHA (help[i - 1]))
884 printf( " %-*.*s %.*s\n", col_width, item_width, item, len, help);
886 while (help[len] == ' ')
894 /* Print help for a specific front-end, etc. */
896 print_filtered_help (unsigned int include_flags,
897 unsigned int exclude_flags,
898 unsigned int any_flags,
899 unsigned int columns,
900 struct gcc_options *opts,
901 unsigned int lang_mask)
906 bool displayed = false;
908 if (include_flags == CL_PARAMS)
910 for (i = 0; i < LAST_PARAM; i++)
912 const char *param = compiler_params[i].option;
914 help = compiler_params[i].help;
915 if (help == NULL || *help == '\0')
917 if (exclude_flags & CL_UNDOCUMENTED)
919 help = undocumented_msg;
922 /* Get the translation. */
925 wrap_help (help, param, strlen (param), columns);
931 if (!opts->x_help_printed)
932 opts->x_help_printed = XCNEWVAR (char, cl_options_count);
934 if (!opts->x_help_enum_printed)
935 opts->x_help_enum_printed = XCNEWVAR (char, cl_enums_count);
937 for (i = 0; i < cl_options_count; i++)
940 const struct cl_option *option = cl_options + i;
945 if (include_flags == 0
946 || ((option->flags & include_flags) != include_flags))
948 if ((option->flags & any_flags) == 0)
952 /* Skip unwanted switches. */
953 if ((option->flags & exclude_flags) != 0)
956 /* The driver currently prints its own help text. */
957 if ((option->flags & CL_DRIVER) != 0
958 && (option->flags & (((1U << cl_lang_count) - 1)
959 | CL_COMMON | CL_TARGET)) == 0)
963 /* Skip switches that have already been printed. */
964 if (opts->x_help_printed[i])
967 opts->x_help_printed[i] = true;
972 if (exclude_flags & CL_UNDOCUMENTED)
974 help = undocumented_msg;
977 /* Get the translation. */
980 /* Find the gap between the name of the
981 option and its descriptive text. */
982 tab = strchr (help, '\t');
991 opt = option->opt_text;
995 /* With the -Q option enabled we change the descriptive text associated
996 with an option to be an indication of its current setting. */
997 if (!opts->x_quiet_flag)
999 void *flag_var = option_flag_var (i, opts);
1001 if (len < (LEFT_COLUMN + 2))
1002 strcpy (new_help, "\t\t");
1004 strcpy (new_help, "\t");
1006 if (flag_var != NULL
1007 && option->var_type != CLVC_DEFER)
1009 if (option->flags & CL_JOINED)
1011 if (option->var_type == CLVC_STRING)
1013 if (* (const char **) flag_var != NULL)
1014 snprintf (new_help + strlen (new_help),
1015 sizeof (new_help) - strlen (new_help),
1016 * (const char **) flag_var);
1018 else if (option->var_type == CLVC_ENUM)
1020 const struct cl_enum *e = &cl_enums[option->var_enum];
1022 const char *arg = NULL;
1024 value = e->get (flag_var);
1025 enum_value_to_arg (e->values, &arg, value, lang_mask);
1027 arg = _("[default]");
1028 snprintf (new_help + strlen (new_help),
1029 sizeof (new_help) - strlen (new_help),
1033 sprintf (new_help + strlen (new_help),
1034 "%#x", * (int *) flag_var);
1037 strcat (new_help, option_enabled (i, opts)
1038 ? _("[enabled]") : _("[disabled]"));
1044 wrap_help (help, opt, len, columns);
1047 if (option->var_type == CLVC_ENUM
1048 && opts->x_help_enum_printed[option->var_enum] != 2)
1049 opts->x_help_enum_printed[option->var_enum] = 1;
1054 unsigned int langs = include_flags & CL_LANG_ALL;
1057 printf (_(" No options with the desired characteristics were found\n"));
1062 /* PR 31349: Tell the user how to see all of the
1063 options supported by a specific front end. */
1064 for (i = 0; (1U << i) < CL_LANG_ALL; i ++)
1065 if ((1U << i) & langs)
1066 printf (_(" None found. Use --help=%s to show *all* the options supported by the %s front-end\n"),
1067 lang_names[i], lang_names[i]);
1071 else if (! displayed)
1072 printf (_(" All options with the desired characteristics have already been displayed\n"));
1076 /* Print details of enumerated option arguments, if those
1077 enumerations have help text headings provided. If no help text
1078 is provided, presume that the possible values are listed in the
1079 help text for the relevant options. */
1080 for (i = 0; i < cl_enums_count; i++)
1082 unsigned int j, pos;
1084 if (opts->x_help_enum_printed[i] != 1)
1086 if (cl_enums[i].help == NULL)
1088 printf (" %s\n ", _(cl_enums[i].help));
1090 for (j = 0; cl_enums[i].values[j].arg != NULL; j++)
1092 unsigned int len = strlen (cl_enums[i].values[j].arg);
1094 if (pos > 4 && pos + 1 + len <= columns)
1096 printf (" %s", cl_enums[i].values[j].arg);
1106 printf ("%s", cl_enums[i].values[j].arg);
1111 opts->x_help_enum_printed[i] = 2;
1115 /* Display help for a specified type of option.
1116 The options must have ALL of the INCLUDE_FLAGS set
1117 ANY of the flags in the ANY_FLAGS set
1118 and NONE of the EXCLUDE_FLAGS set. The current option state is in
1119 OPTS; LANG_MASK is used for interpreting enumerated option state. */
1121 print_specific_help (unsigned int include_flags,
1122 unsigned int exclude_flags,
1123 unsigned int any_flags,
1124 struct gcc_options *opts,
1125 unsigned int lang_mask)
1127 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1128 const char * description = NULL;
1129 const char * descrip_extra = "";
1133 /* Sanity check: Make sure that we do not have more
1134 languages than we have bits available to enumerate them. */
1135 gcc_assert ((1U << cl_lang_count) <= CL_MIN_OPTION_CLASS);
1137 /* If we have not done so already, obtain
1138 the desired maximum width of the output. */
1139 if (opts->x_help_columns == 0)
1143 p = getenv ("COLUMNS");
1146 int value = atoi (p);
1149 opts->x_help_columns = value;
1152 if (opts->x_help_columns == 0)
1153 /* Use a reasonable default. */
1154 opts->x_help_columns = 80;
1157 /* Decide upon the title for the options that we are going to display. */
1158 for (i = 0, flag = 1; flag <= CL_MAX_OPTION_CLASS; flag <<= 1, i ++)
1160 switch (flag & include_flags)
1167 description = _("The following options are target specific");
1170 description = _("The following options control compiler warning messages");
1172 case CL_OPTIMIZATION:
1173 description = _("The following options control optimizations");
1176 description = _("The following options are language-independent");
1179 description = _("The --param option recognizes the following as parameters");
1182 if (i >= cl_lang_count)
1184 if (exclude_flags & all_langs_mask)
1185 description = _("The following options are specific to just the language ");
1187 description = _("The following options are supported by the language ");
1188 descrip_extra = lang_names [i];
1193 if (description == NULL)
1197 if (include_flags & CL_UNDOCUMENTED)
1198 description = _("The following options are not documented");
1199 else if (include_flags & CL_SEPARATE)
1200 description = _("The following options take separate arguments");
1201 else if (include_flags & CL_JOINED)
1202 description = _("The following options take joined arguments");
1205 internal_error ("unrecognized include_flags 0x%x passed to print_specific_help",
1212 if (any_flags & all_langs_mask)
1213 description = _("The following options are language-related");
1215 description = _("The following options are language-independent");
1219 printf ("%s%s:\n", description, descrip_extra);
1220 print_filtered_help (include_flags, exclude_flags, any_flags,
1221 opts->x_help_columns, opts, lang_mask);
1224 /* Handle target- and language-independent options. Return zero to
1225 generate an "unknown option" message. Only options that need
1226 extra handling need to be listed here; if you simply want
1227 DECODED->value assigned to a variable, it happens automatically. */
1230 common_handle_option (struct gcc_options *opts,
1231 struct gcc_options *opts_set,
1232 const struct cl_decoded_option *decoded,
1233 unsigned int lang_mask, int kind ATTRIBUTE_UNUSED,
1235 const struct cl_option_handlers *handlers,
1236 diagnostic_context *dc)
1238 size_t scode = decoded->opt_index;
1239 const char *arg = decoded->arg;
1240 int value = decoded->value;
1241 enum opt_code code = (enum opt_code) scode;
1243 gcc_assert (decoded->canonical_option_num_elements <= 2);
1248 handle_param (opts, opts_set, loc, arg);
1253 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1254 unsigned int undoc_mask;
1257 if (lang_mask == CL_DRIVER)
1260 undoc_mask = ((opts->x_verbose_flag | opts->x_extra_warnings)
1263 /* First display any single language specific options. */
1264 for (i = 0; i < cl_lang_count; i++)
1266 (1U << i, (all_langs_mask & (~ (1U << i))) | undoc_mask, 0, opts,
1268 /* Next display any multi language specific options. */
1269 print_specific_help (0, undoc_mask, all_langs_mask, opts, lang_mask);
1270 /* Then display any remaining, non-language options. */
1271 for (i = CL_MIN_OPTION_CLASS; i <= CL_MAX_OPTION_CLASS; i <<= 1)
1273 print_specific_help (i, undoc_mask, 0, opts, lang_mask);
1274 opts->x_exit_after_options = true;
1278 case OPT__target_help:
1279 if (lang_mask == CL_DRIVER)
1282 print_specific_help (CL_TARGET, CL_UNDOCUMENTED, 0, opts, lang_mask);
1283 opts->x_exit_after_options = true;
1288 const char * a = arg;
1289 unsigned int include_flags = 0;
1290 /* Note - by default we include undocumented options when listing
1291 specific classes. If you only want to see documented options
1292 then add ",^undocumented" to the --help= option. E.g.:
1294 --help=target,^undocumented */
1295 unsigned int exclude_flags = 0;
1297 if (lang_mask == CL_DRIVER)
1300 /* Walk along the argument string, parsing each word in turn.
1302 arg = [^]{word}[,{arg}]
1303 word = {optimizers|target|warnings|undocumented|
1304 params|common|<language>} */
1309 const char * string;
1314 { "optimizers", CL_OPTIMIZATION },
1315 { "target", CL_TARGET },
1316 { "warnings", CL_WARNING },
1317 { "undocumented", CL_UNDOCUMENTED },
1318 { "params", CL_PARAMS },
1319 { "joined", CL_JOINED },
1320 { "separate", CL_SEPARATE },
1321 { "common", CL_COMMON },
1324 unsigned int * pflags;
1326 unsigned int lang_flag, specific_flag;
1333 pflags = & exclude_flags;
1336 pflags = & include_flags;
1338 comma = strchr (a, ',');
1349 /* Check to see if the string matches an option class name. */
1350 for (i = 0, specific_flag = 0; specifics[i].string != NULL; i++)
1351 if (strncasecmp (a, specifics[i].string, len) == 0)
1353 specific_flag = specifics[i].flag;
1357 /* Check to see if the string matches a language name.
1358 Note - we rely upon the alpha-sorted nature of the entries in
1359 the lang_names array, specifically that shorter names appear
1360 before their longer variants. (i.e. C before C++). That way
1361 when we are attempting to match --help=c for example we will
1362 match with C first and not C++. */
1363 for (i = 0, lang_flag = 0; i < cl_lang_count; i++)
1364 if (strncasecmp (a, lang_names[i], len) == 0)
1366 lang_flag = 1U << i;
1370 if (specific_flag != 0)
1373 * pflags |= specific_flag;
1376 /* The option's argument matches both the start of a
1377 language name and the start of an option class name.
1378 We have a special case for when the user has
1379 specified "--help=c", but otherwise we have to issue
1381 if (strncasecmp (a, "c", len) == 0)
1382 * pflags |= lang_flag;
1385 "--help argument %q.*s is ambiguous, "
1386 "please be more specific",
1390 else if (lang_flag != 0)
1391 * pflags |= lang_flag;
1394 "unrecognized argument to --help= option: %q.*s",
1403 print_specific_help (include_flags, exclude_flags, 0, opts,
1405 opts->x_exit_after_options = true;
1410 if (lang_mask == CL_DRIVER)
1413 opts->x_exit_after_options = true;
1419 /* Currently handled in a prescan. */
1423 if (lang_mask == CL_DRIVER)
1426 enable_warning_as_error (arg, value, lang_mask, handlers,
1427 opts, opts_set, loc, dc);
1430 case OPT_Wlarger_than_:
1431 opts->x_larger_than_size = value;
1432 opts->x_warn_larger_than = value != -1;
1435 case OPT_Wfatal_errors:
1436 dc->fatal_errors = value;
1439 case OPT_Wframe_larger_than_:
1440 opts->x_frame_larger_than_size = value;
1441 opts->x_warn_frame_larger_than = value != -1;
1444 case OPT_Wstack_usage_:
1445 opts->x_warn_stack_usage = value;
1446 opts->x_flag_stack_usage_info = value != -1;
1449 case OPT_Wstrict_aliasing:
1450 set_Wstrict_aliasing (opts, value);
1453 case OPT_Wstrict_overflow:
1454 opts->x_warn_strict_overflow = (value
1455 ? (int) WARN_STRICT_OVERFLOW_CONDITIONAL
1459 case OPT_Wsystem_headers:
1460 dc->dc_warn_system_headers = value;
1464 opts->x_flag_gen_aux_info = 1;
1467 case OPT_auxbase_strip:
1469 char *tmp = xstrdup (arg);
1470 strip_off_ending (tmp, strlen (tmp));
1472 opts->x_aux_base_name = tmp;
1477 decode_d_option (arg, opts, loc, dc);
1480 case OPT_fcall_used_:
1481 case OPT_fcall_saved_:
1486 case OPT_fdbg_cnt_list:
1490 case OPT_fdebug_prefix_map_:
1494 case OPT_fdiagnostics_show_location_:
1495 diagnostic_prefixing_rule (dc) = (diagnostic_prefixing_rule_t) value;
1498 case OPT_fdiagnostics_show_option:
1499 dc->show_option_requested = value;
1506 case OPT_ffast_math:
1507 set_fast_math_flags (opts, value);
1510 case OPT_funsafe_math_optimizations:
1511 set_unsafe_math_optimizations_flags (opts, value);
1518 case OPT_finline_limit_:
1519 set_param_value ("max-inline-insns-single", value / 2,
1520 opts->x_param_values, opts_set->x_param_values);
1521 set_param_value ("max-inline-insns-auto", value / 2,
1522 opts->x_param_values, opts_set->x_param_values);
1525 case OPT_finstrument_functions_exclude_function_list_:
1526 add_comma_separated_to_vector
1527 (&opts->x_flag_instrument_functions_exclude_functions, arg);
1530 case OPT_finstrument_functions_exclude_file_list_:
1531 add_comma_separated_to_vector
1532 (&opts->x_flag_instrument_functions_exclude_files, arg);
1535 case OPT_fmessage_length_:
1536 pp_set_line_maximum_length (dc->printer, value);
1539 case OPT_fpack_struct_:
1540 if (value <= 0 || (value & (value - 1)) || value > 16)
1542 "structure alignment must be a small power of two, not %d",
1545 opts->x_initial_max_fld_align = value;
1549 case OPT_fplugin_arg_:
1553 case OPT_fprofile_use_:
1554 opts->x_profile_data_prefix = xstrdup (arg);
1555 opts->x_flag_profile_use = true;
1557 /* No break here - do -fprofile-use processing. */
1558 case OPT_fprofile_use:
1559 if (!opts_set->x_flag_branch_probabilities)
1560 opts->x_flag_branch_probabilities = value;
1561 if (!opts_set->x_flag_profile_values)
1562 opts->x_flag_profile_values = value;
1563 if (!opts_set->x_flag_unroll_loops)
1564 opts->x_flag_unroll_loops = value;
1565 if (!opts_set->x_flag_peel_loops)
1566 opts->x_flag_peel_loops = value;
1567 if (!opts_set->x_flag_tracer)
1568 opts->x_flag_tracer = value;
1569 if (!opts_set->x_flag_value_profile_transformations)
1570 opts->x_flag_value_profile_transformations = value;
1571 if (!opts_set->x_flag_inline_functions)
1572 opts->x_flag_inline_functions = value;
1573 if (!opts_set->x_flag_ipa_cp)
1574 opts->x_flag_ipa_cp = value;
1575 if (!opts_set->x_flag_ipa_cp_clone
1576 && value && opts->x_flag_ipa_cp)
1577 opts->x_flag_ipa_cp_clone = value;
1578 if (!opts_set->x_flag_predictive_commoning)
1579 opts->x_flag_predictive_commoning = value;
1580 if (!opts_set->x_flag_unswitch_loops)
1581 opts->x_flag_unswitch_loops = value;
1582 if (!opts_set->x_flag_gcse_after_reload)
1583 opts->x_flag_gcse_after_reload = value;
1586 case OPT_fprofile_generate_:
1587 opts->x_profile_data_prefix = xstrdup (arg);
1589 /* No break here - do -fprofile-generate processing. */
1590 case OPT_fprofile_generate:
1591 if (!opts_set->x_profile_arc_flag)
1592 opts->x_profile_arc_flag = value;
1593 if (!opts_set->x_flag_profile_values)
1594 opts->x_flag_profile_values = value;
1595 if (!opts_set->x_flag_value_profile_transformations)
1596 opts->x_flag_value_profile_transformations = value;
1597 if (!opts_set->x_flag_inline_functions)
1598 opts->x_flag_inline_functions = value;
1599 /* FIXME: Instrumentation we insert makes ipa-reference bitmaps
1600 quadratic. Disable the pass until better memory representation
1602 if (!opts_set->x_flag_ipa_reference && opts->x_in_lto_p)
1603 opts->x_flag_ipa_reference = false;
1606 case OPT_fshow_column:
1607 dc->show_column = value;
1610 case OPT_frandom_seed:
1611 /* The real switch is -fno-random-seed. */
1617 case OPT_frandom_seed_:
1621 case OPT_fsched_verbose_:
1622 #ifdef INSN_SCHEDULING
1623 /* Handled with Var in common.opt. */
1629 case OPT_fsched_stalled_insns_:
1630 opts->x_flag_sched_stalled_insns = value;
1631 if (opts->x_flag_sched_stalled_insns == 0)
1632 opts->x_flag_sched_stalled_insns = -1;
1635 case OPT_fsched_stalled_insns_dep_:
1636 opts->x_flag_sched_stalled_insns_dep = value;
1639 case OPT_fstack_check_:
1640 if (!strcmp (arg, "no"))
1641 opts->x_flag_stack_check = NO_STACK_CHECK;
1642 else if (!strcmp (arg, "generic"))
1643 /* This is the old stack checking method. */
1644 opts->x_flag_stack_check = STACK_CHECK_BUILTIN
1645 ? FULL_BUILTIN_STACK_CHECK
1646 : GENERIC_STACK_CHECK;
1647 else if (!strcmp (arg, "specific"))
1648 /* This is the new stack checking method. */
1649 opts->x_flag_stack_check = STACK_CHECK_BUILTIN
1650 ? FULL_BUILTIN_STACK_CHECK
1651 : STACK_CHECK_STATIC_BUILTIN
1652 ? STATIC_BUILTIN_STACK_CHECK
1653 : GENERIC_STACK_CHECK;
1655 warning_at (loc, 0, "unknown stack check parameter \"%s\"", arg);
1658 case OPT_fstack_limit:
1659 /* The real switch is -fno-stack-limit. */
1665 case OPT_fstack_limit_register_:
1666 case OPT_fstack_limit_symbol_:
1670 case OPT_fstack_usage:
1671 opts->x_flag_stack_usage = value;
1672 opts->x_flag_stack_usage_info = value != 0;
1675 case OPT_ftree_vectorizer_verbose_:
1676 vect_set_verbosity_level (opts, value);
1680 set_debug_level (NO_DEBUG, DEFAULT_GDB_EXTENSIONS, arg, opts, opts_set,
1685 set_debug_level (SDB_DEBUG, false, arg, opts, opts_set, loc);
1689 if (value < 2 || value > 4)
1690 error_at (loc, "dwarf version %d is not supported", value);
1692 opts->x_dwarf_version = value;
1693 set_debug_level (DWARF2_DEBUG, false, "", opts, opts_set, loc);
1697 set_debug_level (NO_DEBUG, 2, arg, opts, opts_set, loc);
1702 set_debug_level (DBX_DEBUG, code == OPT_gstabs_, arg, opts, opts_set,
1707 set_debug_level (VMS_DEBUG, false, arg, opts, opts_set, loc);
1712 set_debug_level (XCOFF_DEBUG, code == OPT_gxcoff_, arg, opts, opts_set,
1716 case OPT_pedantic_errors:
1717 opts->x_pedantic = 1;
1718 dc->pedantic_errors = 1;
1722 opts->x_flag_lto = value ? "" : NULL;
1726 dc->dc_inhibit_warnings = true;
1729 case OPT_fmax_errors_:
1730 dc->max_errors = value;
1733 case OPT_fuse_linker_plugin:
1734 /* No-op. Used by the driver and passed to us because it starts with f.*/
1737 case OPT_Wuninitialized:
1738 /* Also turn on maybe uninitialized warning. */
1739 opts->x_warn_maybe_uninitialized = value;
1743 /* If the flag was handled in a standard way, assume the lack of
1744 processing here is intentional. */
1745 gcc_assert (option_flag_var (scode, opts));
1752 /* Handle --param NAME=VALUE. */
1754 handle_param (struct gcc_options *opts, struct gcc_options *opts_set,
1755 location_t loc, const char *carg)
1760 arg = xstrdup (carg);
1761 equal = strchr (arg, '=');
1763 error_at (loc, "%s: --param arguments should be of the form NAME=VALUE",
1767 value = integral_argument (equal + 1);
1769 error_at (loc, "invalid --param value %qs", equal + 1);
1773 set_param_value (arg, value,
1774 opts->x_param_values, opts_set->x_param_values);
1781 /* Used to set the level of strict aliasing warnings in OPTS,
1782 when no level is specified (i.e., when -Wstrict-aliasing, and not
1783 -Wstrict-aliasing=level was given).
1784 ONOFF is assumed to take value 1 when -Wstrict-aliasing is specified,
1785 and 0 otherwise. After calling this function, wstrict_aliasing will be
1786 set to the default value of -Wstrict_aliasing=level, currently 3. */
1788 set_Wstrict_aliasing (struct gcc_options *opts, int onoff)
1790 gcc_assert (onoff == 0 || onoff == 1);
1792 opts->x_warn_strict_aliasing = 3;
1794 opts->x_warn_strict_aliasing = 0;
1797 /* The following routines are useful in setting all the flags that
1798 -ffast-math and -fno-fast-math imply. */
1800 set_fast_math_flags (struct gcc_options *opts, int set)
1802 if (!opts->frontend_set_flag_unsafe_math_optimizations)
1804 opts->x_flag_unsafe_math_optimizations = set;
1805 set_unsafe_math_optimizations_flags (opts, set);
1807 if (!opts->frontend_set_flag_finite_math_only)
1808 opts->x_flag_finite_math_only = set;
1809 if (!opts->frontend_set_flag_errno_math)
1810 opts->x_flag_errno_math = !set;
1813 if (!opts->frontend_set_flag_signaling_nans)
1814 opts->x_flag_signaling_nans = 0;
1815 if (!opts->frontend_set_flag_rounding_math)
1816 opts->x_flag_rounding_math = 0;
1817 if (!opts->frontend_set_flag_cx_limited_range)
1818 opts->x_flag_cx_limited_range = 1;
1822 /* When -funsafe-math-optimizations is set the following
1823 flags are set as well. */
1825 set_unsafe_math_optimizations_flags (struct gcc_options *opts, int set)
1827 if (!opts->frontend_set_flag_trapping_math)
1828 opts->x_flag_trapping_math = !set;
1829 if (!opts->frontend_set_flag_signed_zeros)
1830 opts->x_flag_signed_zeros = !set;
1831 if (!opts->frontend_set_flag_associative_math)
1832 opts->x_flag_associative_math = set;
1833 if (!opts->frontend_set_flag_reciprocal_math)
1834 opts->x_flag_reciprocal_math = set;
1837 /* Return true iff flags in OPTS are set as if -ffast-math. */
1839 fast_math_flags_set_p (const struct gcc_options *opts)
1841 return (!opts->x_flag_trapping_math
1842 && opts->x_flag_unsafe_math_optimizations
1843 && opts->x_flag_finite_math_only
1844 && !opts->x_flag_signed_zeros
1845 && !opts->x_flag_errno_math);
1848 /* Return true iff flags are set as if -ffast-math but using the flags stored
1849 in the struct cl_optimization structure. */
1851 fast_math_flags_struct_set_p (struct cl_optimization *opt)
1853 return (!opt->x_flag_trapping_math
1854 && opt->x_flag_unsafe_math_optimizations
1855 && opt->x_flag_finite_math_only
1856 && !opt->x_flag_signed_zeros
1857 && !opt->x_flag_errno_math);
1860 /* Handle a debug output -g switch for options OPTS
1861 (OPTS_SET->x_write_symbols storing whether a debug type was passed
1862 explicitly), location LOC. EXTENDED is true or false to support
1863 extended output (2 is special and means "-ggdb" was given). */
1865 set_debug_level (enum debug_info_type type, int extended, const char *arg,
1866 struct gcc_options *opts, struct gcc_options *opts_set,
1869 opts->x_use_gnu_debug_info_extensions = extended;
1871 if (type == NO_DEBUG)
1873 if (opts->x_write_symbols == NO_DEBUG)
1875 opts->x_write_symbols = PREFERRED_DEBUGGING_TYPE;
1879 #ifdef DWARF2_DEBUGGING_INFO
1880 opts->x_write_symbols = DWARF2_DEBUG;
1881 #elif defined DBX_DEBUGGING_INFO
1882 opts->x_write_symbols = DBX_DEBUG;
1886 if (opts->x_write_symbols == NO_DEBUG)
1887 warning_at (loc, 0, "target system does not support debug output");
1892 /* Does it conflict with an already selected type? */
1893 if (opts_set->x_write_symbols != NO_DEBUG
1894 && opts->x_write_symbols != NO_DEBUG
1895 && type != opts->x_write_symbols)
1896 error_at (loc, "debug format \"%s\" conflicts with prior selection",
1897 debug_type_names[type]);
1898 opts->x_write_symbols = type;
1899 opts_set->x_write_symbols = type;
1902 /* A debug flag without a level defaults to level 2. */
1905 if (!opts->x_debug_info_level)
1906 opts->x_debug_info_level = DINFO_LEVEL_NORMAL;
1910 int argval = integral_argument (arg);
1912 error_at (loc, "unrecognised debug output level \"%s\"", arg);
1913 else if (argval > 3)
1914 error_at (loc, "debug output level %s is too high", arg);
1916 opts->x_debug_info_level = (enum debug_info_levels) argval;
1920 /* Arrange to dump core on error for diagnostic context DC. (The
1921 regular error message is still printed first, except in the case of
1925 setup_core_dumping (diagnostic_context *dc)
1928 signal (SIGABRT, SIG_DFL);
1930 #if defined(HAVE_SETRLIMIT)
1933 if (getrlimit (RLIMIT_CORE, &rlim) != 0)
1934 fatal_error ("getting core file size maximum limit: %m");
1935 rlim.rlim_cur = rlim.rlim_max;
1936 if (setrlimit (RLIMIT_CORE, &rlim) != 0)
1937 fatal_error ("setting core file size limit to maximum: %m");
1940 diagnostic_abort_on_error (dc);
1943 /* Parse a -d<ARG> command line switch for OPTS, location LOC,
1944 diagnostic context DC. */
1947 decode_d_option (const char *arg, struct gcc_options *opts,
1948 location_t loc, diagnostic_context *dc)
1956 opts->x_flag_debug_asm = 1;
1959 opts->x_flag_print_asm_name = 1;
1962 opts->x_flag_dump_rtl_in_asm = 1;
1963 opts->x_flag_print_asm_name = 1;
1966 opts->x_graph_dump_format = vcg;
1969 opts->x_rtl_dump_and_exit = 1;
1971 case 'D': /* These are handled by the preprocessor. */
1978 setup_core_dumping (dc);
1981 opts->x_flag_dump_all_passed = true;
1985 warning_at (loc, 0, "unrecognized gcc debugging option: %c", c);
1990 /* Enable (or disable if VALUE is 0) a warning option ARG (language
1991 mask LANG_MASK, option handlers HANDLERS) as an error for option
1992 structures OPTS and OPTS_SET, diagnostic context DC (possibly
1993 NULL), location LOC. This is used by -Werror=. */
1996 enable_warning_as_error (const char *arg, int value, unsigned int lang_mask,
1997 const struct cl_option_handlers *handlers,
1998 struct gcc_options *opts,
1999 struct gcc_options *opts_set,
2000 location_t loc, diagnostic_context *dc)
2005 new_option = XNEWVEC (char, strlen (arg) + 2);
2006 new_option[0] = 'W';
2007 strcpy (new_option + 1, arg);
2008 option_index = find_opt (new_option, lang_mask);
2009 if (option_index == OPT_SPECIAL_unknown)
2011 error_at (loc, "-Werror=%s: no option -%s", arg, new_option);
2015 const diagnostic_t kind = value ? DK_ERROR : DK_WARNING;
2017 control_warning_option (option_index, (int) kind, value,
2019 handlers, opts, opts_set, dc);
2020 if (option_index == OPT_Wuninitialized)
2021 enable_warning_as_error ("maybe-uninitialized", value, lang_mask,
2022 handlers, opts, opts_set, loc, dc);
2027 /* Return malloced memory for the name of the option OPTION_INDEX
2028 which enabled a diagnostic (context CONTEXT), originally of type
2029 ORIG_DIAG_KIND but possibly converted to DIAG_KIND by options such
2033 option_name (diagnostic_context *context, int option_index,
2034 diagnostic_t orig_diag_kind, diagnostic_t diag_kind)
2038 /* A warning classified as an error. */
2039 if ((orig_diag_kind == DK_WARNING || orig_diag_kind == DK_PEDWARN)
2040 && diag_kind == DK_ERROR)
2041 return concat (cl_options[OPT_Werror_].opt_text,
2042 /* Skip over "-W". */
2043 cl_options[option_index].opt_text + 2,
2045 /* A warning with option. */
2047 return xstrdup (cl_options[option_index].opt_text);
2049 /* A warning without option classified as an error. */
2050 else if (orig_diag_kind == DK_WARNING || orig_diag_kind == DK_PEDWARN
2051 || diag_kind == DK_WARNING)
2053 if (context->warning_as_error_requested)
2054 return xstrdup (cl_options[OPT_Werror].opt_text);
2056 return xstrdup (_("enabled by default"));