1 /* Command line option handling.
2 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
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/>. */
27 #ifdef HAVE_SYS_RESOURCE_H
28 # include <sys/resource.h>
32 #include "coretypes.h"
33 #include "tm.h" /* Needed by rtl.h and used for DWARF2_DEBUGGING_INFO
34 and DBX_DEBUGGING_INFO. */
35 #include "rtl.h" /* Needed by insn-attr.h. */
40 #include "diagnostic.h"
41 #include "opts-diagnostic.h"
42 #include "insn-attr.h" /* For INSN_SCHEDULING and DELAY_SLOTS. */
45 /* Run the second compilation of -fcompare-debug. Not defined using
46 Var in common.opt because this is used in Ada code and so must be
47 an actual variable not a macro. */
48 int flag_compare_debug;
50 /* Parse the -femit-struct-debug-detailed option value
51 and set the flag variables. */
53 #define MATCH( prefix, string ) \
54 ((strncmp (prefix, string, sizeof prefix - 1) == 0) \
55 ? ((string += sizeof prefix - 1), 1) : 0)
58 set_struct_debug_option (struct gcc_options *opts, location_t loc,
61 /* various labels for comparison */
62 static const char dfn_lbl[] = "dfn:", dir_lbl[] = "dir:", ind_lbl[] = "ind:";
63 static const char ord_lbl[] = "ord:", gen_lbl[] = "gen:";
64 static const char none_lbl[] = "none", any_lbl[] = "any";
65 static const char base_lbl[] = "base", sys_lbl[] = "sys";
67 enum debug_struct_file files = DINFO_STRUCT_FILE_ANY;
68 /* Default is to apply to as much as possible. */
69 enum debug_info_usage usage = DINFO_USAGE_NUM_ENUMS;
73 if (MATCH (dfn_lbl, spec))
74 usage = DINFO_USAGE_DFN;
75 else if (MATCH (dir_lbl, spec))
76 usage = DINFO_USAGE_DIR_USE;
77 else if (MATCH (ind_lbl, spec))
78 usage = DINFO_USAGE_IND_USE;
80 /* Generics or not? */
81 if (MATCH (ord_lbl, spec))
83 else if (MATCH (gen_lbl, spec))
86 /* What allowable environment? */
87 if (MATCH (none_lbl, spec))
88 files = DINFO_STRUCT_FILE_NONE;
89 else if (MATCH (any_lbl, spec))
90 files = DINFO_STRUCT_FILE_ANY;
91 else if (MATCH (sys_lbl, spec))
92 files = DINFO_STRUCT_FILE_SYS;
93 else if (MATCH (base_lbl, spec))
94 files = DINFO_STRUCT_FILE_BASE;
97 "argument %qs to %<-femit-struct-debug-detailed%> "
101 /* Effect the specification. */
102 if (usage == DINFO_USAGE_NUM_ENUMS)
106 opts->x_debug_struct_ordinary[DINFO_USAGE_DFN] = files;
107 opts->x_debug_struct_ordinary[DINFO_USAGE_DIR_USE] = files;
108 opts->x_debug_struct_ordinary[DINFO_USAGE_IND_USE] = files;
112 opts->x_debug_struct_generic[DINFO_USAGE_DFN] = files;
113 opts->x_debug_struct_generic[DINFO_USAGE_DIR_USE] = files;
114 opts->x_debug_struct_generic[DINFO_USAGE_IND_USE] = files;
120 opts->x_debug_struct_ordinary[usage] = files;
122 opts->x_debug_struct_generic[usage] = files;
126 set_struct_debug_option (opts, loc, spec+1);
129 /* No more -femit-struct-debug-detailed specifications.
133 "argument %qs to %<-femit-struct-debug-detailed%> unknown",
135 if (opts->x_debug_struct_ordinary[DINFO_USAGE_DIR_USE]
136 < opts->x_debug_struct_ordinary[DINFO_USAGE_IND_USE]
137 || opts->x_debug_struct_generic[DINFO_USAGE_DIR_USE]
138 < opts->x_debug_struct_generic[DINFO_USAGE_IND_USE])
140 "%<-femit-struct-debug-detailed=dir:...%> must allow "
141 "at least as much as "
142 "%<-femit-struct-debug-detailed=ind:...%>");
146 /* Handle -ftree-vectorizer-verbose=VAL for options OPTS. */
149 vect_set_verbosity_level (struct gcc_options *opts, int val)
151 if (val < MAX_VERBOSITY_LEVEL)
152 opts->x_user_vect_verbosity_level = (enum vect_verbosity_levels) val;
154 opts->x_user_vect_verbosity_level
155 = (enum vect_verbosity_levels) (MAX_VERBOSITY_LEVEL - 1);
159 /* Strip off a legitimate source ending from the input string NAME of
160 length LEN. Rather than having to know the names used by all of
161 our front ends, we strip off an ending of a period followed by
162 up to five characters. (Java uses ".class".) */
165 strip_off_ending (char *name, int len)
168 for (i = 2; i < 6 && len > i; i++)
170 if (name[len - i] == '.')
172 name[len - i] = '\0';
178 /* Find the base name of a path, stripping off both directories and
179 a single final extension. */
181 base_of_path (const char *path, const char **base_out)
183 const char *base = path;
185 const char *p = path;
189 if (IS_DIR_SEPARATOR(c))
204 /* What to print when a switch has no documentation. */
205 static const char undocumented_msg[] = N_("This switch lacks documentation");
207 typedef char *char_p; /* For DEF_VEC_P. */
209 DEF_VEC_ALLOC_P(char_p,heap);
211 static void handle_param (struct gcc_options *opts,
212 struct gcc_options *opts_set, location_t loc,
214 static void set_debug_level (enum debug_info_type type, int extended,
215 const char *arg, struct gcc_options *opts,
216 struct gcc_options *opts_set,
218 static void set_fast_math_flags (struct gcc_options *opts, int set);
219 static void decode_d_option (const char *arg, struct gcc_options *opts,
220 location_t loc, diagnostic_context *dc);
221 static void set_unsafe_math_optimizations_flags (struct gcc_options *opts,
223 static void enable_warning_as_error (const char *arg, int value,
224 unsigned int lang_mask,
225 const struct cl_option_handlers *handlers,
226 struct gcc_options *opts,
227 struct gcc_options *opts_set,
229 diagnostic_context *dc);
231 /* Handle a back-end option; arguments and return value as for
235 target_handle_option (struct gcc_options *opts,
236 struct gcc_options *opts_set,
237 const struct cl_decoded_option *decoded,
238 unsigned int lang_mask ATTRIBUTE_UNUSED, int kind,
239 location_t loc ATTRIBUTE_UNUSED,
240 const struct cl_option_handlers *handlers ATTRIBUTE_UNUSED,
241 diagnostic_context *dc)
243 gcc_assert (opts == &global_options);
244 gcc_assert (opts_set == &global_options_set);
245 gcc_assert (dc == global_dc);
246 gcc_assert (decoded->canonical_option_num_elements <= 2);
247 gcc_assert (kind == DK_UNSPECIFIED);
248 /* Although the location is not passed down to
249 targetm.handle_option, do not make assertions about its value;
250 options may come from optimize attributes and having the correct
251 location in the handler is not generally important. */
252 return targetm.handle_option (decoded->opt_index, decoded->arg,
256 /* Add comma-separated strings to a char_p vector. */
259 add_comma_separated_to_vector (void **pvec, const char *arg)
265 VEC(char_p,heap) *vec = (VEC(char_p,heap) *) *pvec;
267 /* We never free this string. */
280 VEC_safe_push (char_p, heap, vec, token_start);
283 if (*r == '\\' && r[1] == ',')
291 if (*token_start != '\0')
292 VEC_safe_push (char_p, heap, vec, token_start);
297 /* Initialize OPTS and OPTS_SET before using them in parsing options. */
300 init_options_struct (struct gcc_options *opts, struct gcc_options *opts_set)
302 size_t num_params = get_num_compiler_params ();
304 *opts = global_options_init;
305 memset (opts_set, 0, sizeof (*opts_set));
307 opts->x_param_values = XNEWVEC (int, num_params);
308 opts_set->x_param_values = XCNEWVEC (int, num_params);
309 init_param_values (opts->x_param_values);
311 /* Use priority coloring if cover classes is not defined for the
313 if (targetm.ira_cover_classes == NULL)
314 opts->x_flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
316 /* Initialize whether `char' is signed. */
317 opts->x_flag_signed_char = DEFAULT_SIGNED_CHAR;
318 /* Set this to a special "uninitialized" value. The actual default
319 is set after target options have been processed. */
320 opts->x_flag_short_enums = 2;
322 /* Initialize target_flags before targetm.target_option.optimization
323 so the latter can modify it. */
324 opts->x_target_flags = targetm.default_target_flags;
326 /* Some targets have ABI-specified unwind tables. */
327 opts->x_flag_unwind_tables = targetm.unwind_tables_default;
329 /* Some targets have other target-specific initialization. */
330 targetm.target_option.init_struct (opts);
333 /* If indicated by the optimization level LEVEL (-Os if SIZE is set,
334 -Ofast if FAST is set), apply the option DEFAULT_OPT to OPTS and
335 OPTS_SET, diagnostic context DC, location LOC, with language mask
336 LANG_MASK and option handlers HANDLERS. */
339 maybe_default_option (struct gcc_options *opts,
340 struct gcc_options *opts_set,
341 const struct default_options *default_opt,
342 int level, bool size, bool fast,
343 unsigned int lang_mask,
344 const struct cl_option_handlers *handlers,
346 diagnostic_context *dc)
348 const struct cl_option *option = &cl_options[default_opt->opt_index];
352 gcc_assert (level == 2);
354 gcc_assert (level == 3);
356 switch (default_opt->levels)
362 case OPT_LEVELS_0_ONLY:
363 enabled = (level == 0);
366 case OPT_LEVELS_1_PLUS:
367 enabled = (level >= 1);
370 case OPT_LEVELS_1_PLUS_SPEED_ONLY:
371 enabled = (level >= 1 && !size);
374 case OPT_LEVELS_2_PLUS:
375 enabled = (level >= 2);
378 case OPT_LEVELS_2_PLUS_SPEED_ONLY:
379 enabled = (level >= 2 && !size);
382 case OPT_LEVELS_3_PLUS:
383 enabled = (level >= 3);
386 case OPT_LEVELS_3_PLUS_AND_SIZE:
387 enabled = (level >= 3 || size);
390 case OPT_LEVELS_SIZE:
394 case OPT_LEVELS_FAST:
398 case OPT_LEVELS_NONE:
404 handle_generated_option (opts, opts_set, default_opt->opt_index,
405 default_opt->arg, default_opt->value,
406 lang_mask, DK_UNSPECIFIED, loc,
408 else if (default_opt->arg == NULL
409 && !(option->flags & CL_REJECT_NEGATIVE))
410 handle_generated_option (opts, opts_set, default_opt->opt_index,
411 default_opt->arg, !default_opt->value,
412 lang_mask, DK_UNSPECIFIED, loc,
416 /* As indicated by the optimization level LEVEL (-Os if SIZE is set,
417 -Ofast if FAST is set), apply the options in array DEFAULT_OPTS to
418 OPTS and OPTS_SET, diagnostic context DC, location LOC, with
419 language mask LANG_MASK and option handlers HANDLERS. */
422 maybe_default_options (struct gcc_options *opts,
423 struct gcc_options *opts_set,
424 const struct default_options *default_opts,
425 int level, bool size, bool fast,
426 unsigned int lang_mask,
427 const struct cl_option_handlers *handlers,
429 diagnostic_context *dc)
433 for (i = 0; default_opts[i].levels != OPT_LEVELS_NONE; i++)
434 maybe_default_option (opts, opts_set, &default_opts[i],
435 level, size, fast, lang_mask, handlers, loc, dc);
438 /* Table of options enabled by default at different levels. */
440 static const struct default_options default_options_table[] =
442 /* -O1 optimizations. */
443 { OPT_LEVELS_1_PLUS, OPT_fdefer_pop, NULL, 1 },
445 { OPT_LEVELS_1_PLUS, OPT_fdelayed_branch, NULL, 1 },
447 { OPT_LEVELS_1_PLUS, OPT_fguess_branch_probability, NULL, 1 },
448 { OPT_LEVELS_1_PLUS, OPT_fcprop_registers, NULL, 1 },
449 { OPT_LEVELS_1_PLUS, OPT_fforward_propagate, NULL, 1 },
450 { OPT_LEVELS_1_PLUS, OPT_fif_conversion, NULL, 1 },
451 { OPT_LEVELS_1_PLUS, OPT_fif_conversion2, NULL, 1 },
452 { OPT_LEVELS_1_PLUS, OPT_fipa_pure_const, NULL, 1 },
453 { OPT_LEVELS_1_PLUS, OPT_fipa_reference, NULL, 1 },
454 { OPT_LEVELS_1_PLUS, OPT_fipa_profile, NULL, 1 },
455 { OPT_LEVELS_1_PLUS, OPT_fmerge_constants, NULL, 1 },
456 { OPT_LEVELS_1_PLUS, OPT_fsplit_wide_types, NULL, 1 },
457 { OPT_LEVELS_1_PLUS, OPT_ftree_ccp, NULL, 1 },
458 { OPT_LEVELS_1_PLUS, OPT_ftree_bit_ccp, NULL, 1 },
459 { OPT_LEVELS_1_PLUS, OPT_ftree_dce, NULL, 1 },
460 { OPT_LEVELS_1_PLUS, OPT_ftree_dominator_opts, NULL, 1 },
461 { OPT_LEVELS_1_PLUS, OPT_ftree_dse, NULL, 1 },
462 { OPT_LEVELS_1_PLUS, OPT_ftree_ter, NULL, 1 },
463 { OPT_LEVELS_1_PLUS, OPT_ftree_sra, NULL, 1 },
464 { OPT_LEVELS_1_PLUS, OPT_ftree_copyrename, NULL, 1 },
465 { OPT_LEVELS_1_PLUS, OPT_ftree_fre, NULL, 1 },
466 { OPT_LEVELS_1_PLUS, OPT_ftree_copy_prop, NULL, 1 },
467 { OPT_LEVELS_1_PLUS, OPT_ftree_sink, NULL, 1 },
468 { OPT_LEVELS_1_PLUS, OPT_ftree_ch, NULL, 1 },
469 { OPT_LEVELS_1_PLUS, OPT_fcombine_stack_adjustments, NULL, 1 },
471 /* -O2 optimizations. */
472 { OPT_LEVELS_2_PLUS, OPT_finline_small_functions, NULL, 1 },
473 { OPT_LEVELS_2_PLUS, OPT_findirect_inlining, NULL, 1 },
474 { OPT_LEVELS_2_PLUS, OPT_fpartial_inlining, NULL, 1 },
475 { OPT_LEVELS_2_PLUS, OPT_fthread_jumps, NULL, 1 },
476 { OPT_LEVELS_2_PLUS, OPT_fcrossjumping, NULL, 1 },
477 { OPT_LEVELS_2_PLUS, OPT_foptimize_sibling_calls, NULL, 1 },
478 { OPT_LEVELS_2_PLUS, OPT_fcse_follow_jumps, NULL, 1 },
479 { OPT_LEVELS_2_PLUS, OPT_fgcse, NULL, 1 },
480 { OPT_LEVELS_2_PLUS, OPT_fexpensive_optimizations, NULL, 1 },
481 { OPT_LEVELS_2_PLUS, OPT_frerun_cse_after_loop, NULL, 1 },
482 { OPT_LEVELS_2_PLUS, OPT_fcaller_saves, NULL, 1 },
483 { OPT_LEVELS_2_PLUS, OPT_fpeephole2, NULL, 1 },
484 #ifdef INSN_SCHEDULING
485 /* Only run the pre-regalloc scheduling pass if optimizing for speed. */
486 { OPT_LEVELS_2_PLUS_SPEED_ONLY, OPT_fschedule_insns, NULL, 1 },
487 { OPT_LEVELS_2_PLUS, OPT_fschedule_insns2, NULL, 1 },
489 { OPT_LEVELS_2_PLUS, OPT_fregmove, NULL, 1 },
490 { OPT_LEVELS_2_PLUS, OPT_fstrict_aliasing, NULL, 1 },
491 { OPT_LEVELS_2_PLUS, OPT_fstrict_overflow, NULL, 1 },
492 { OPT_LEVELS_2_PLUS, OPT_freorder_blocks, NULL, 1 },
493 { OPT_LEVELS_2_PLUS, OPT_freorder_functions, NULL, 1 },
494 { OPT_LEVELS_2_PLUS, OPT_ftree_vrp, NULL, 1 },
495 { OPT_LEVELS_2_PLUS, OPT_ftree_builtin_call_dce, NULL, 1 },
496 { OPT_LEVELS_2_PLUS, OPT_ftree_pre, NULL, 1 },
497 { OPT_LEVELS_2_PLUS, OPT_ftree_switch_conversion, NULL, 1 },
498 { OPT_LEVELS_2_PLUS, OPT_fipa_cp, 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 },
505 /* -O3 optimizations. */
506 { OPT_LEVELS_3_PLUS, OPT_ftree_loop_distribute_patterns, NULL, 1 },
507 { OPT_LEVELS_3_PLUS, OPT_fpredictive_commoning, NULL, 1 },
508 /* Inlining of functions reducing size is a good idea with -Os
509 regardless of them being declared inline. */
510 { OPT_LEVELS_3_PLUS_AND_SIZE, OPT_finline_functions, NULL, 1 },
511 { OPT_LEVELS_3_PLUS, OPT_funswitch_loops, NULL, 1 },
512 { OPT_LEVELS_3_PLUS, OPT_fgcse_after_reload, NULL, 1 },
513 { OPT_LEVELS_3_PLUS, OPT_ftree_vectorize, NULL, 1 },
514 { OPT_LEVELS_3_PLUS, OPT_fipa_cp_clone, NULL, 1 },
516 /* -Ofast adds optimizations to -O3. */
517 { OPT_LEVELS_FAST, OPT_ffast_math, NULL, 1 },
519 { OPT_LEVELS_NONE, 0, NULL, 0 }
522 /* Default the options in OPTS and OPTS_SET based on the optimization
523 settings in DECODED_OPTIONS and DECODED_OPTIONS_COUNT. */
525 default_options_optimization (struct gcc_options *opts,
526 struct gcc_options *opts_set,
527 struct cl_decoded_option *decoded_options,
528 unsigned int decoded_options_count,
530 unsigned int lang_mask,
531 const struct cl_option_handlers *handlers,
532 diagnostic_context *dc)
538 /* Scan to see what optimization level has been specified. That will
539 determine the default value of many flags. */
540 for (i = 1; i < decoded_options_count; i++)
542 struct cl_decoded_option *opt = &decoded_options[i];
543 switch (opt->opt_index)
546 if (*opt->arg == '\0')
548 opts->x_optimize = 1;
549 opts->x_optimize_size = 0;
554 const int optimize_val = integral_argument (opt->arg);
555 if (optimize_val == -1)
557 "argument to %qs should be a non-negative integer",
561 opts->x_optimize = optimize_val;
562 if ((unsigned int) opts->x_optimize > 255)
563 opts->x_optimize = 255;
564 opts->x_optimize_size = 0;
571 opts->x_optimize_size = 1;
573 /* Optimizing for size forces optimize to be 2. */
574 opts->x_optimize = 2;
579 /* -Ofast only adds flags to -O3. */
580 opts->x_optimize_size = 0;
581 opts->x_optimize = 3;
586 /* Ignore other options in this prescan. */
591 maybe_default_options (opts, opts_set, default_options_table,
592 opts->x_optimize, opts->x_optimize_size,
593 ofast, lang_mask, handlers, loc, dc);
595 /* -O2 param settings. */
596 opt2 = (opts->x_optimize >= 2);
598 /* Track fields in field-sensitive alias analysis. */
599 maybe_set_param_value
600 (PARAM_MAX_FIELDS_FOR_FIELD_SENSITIVE,
601 opt2 ? 100 : default_param_value (PARAM_MAX_FIELDS_FOR_FIELD_SENSITIVE),
602 opts->x_param_values, opts_set->x_param_values);
604 /* For -O1 only do loop invariant motion for very small loops. */
605 maybe_set_param_value
606 (PARAM_LOOP_INVARIANT_MAX_BBS_IN_LOOP,
607 opt2 ? default_param_value (PARAM_LOOP_INVARIANT_MAX_BBS_IN_LOOP) : 1000,
608 opts->x_param_values, opts_set->x_param_values);
610 if (opts->x_optimize_size)
611 /* We want to crossjump as much as possible. */
612 maybe_set_param_value (PARAM_MIN_CROSSJUMP_INSNS, 1,
613 opts->x_param_values, opts_set->x_param_values);
615 maybe_set_param_value (PARAM_MIN_CROSSJUMP_INSNS,
616 default_param_value (PARAM_MIN_CROSSJUMP_INSNS),
617 opts->x_param_values, opts_set->x_param_values);
619 /* Allow default optimizations to be specified on a per-machine basis. */
620 maybe_default_options (opts, opts_set,
621 targetm.target_option.optimization_table,
622 opts->x_optimize, opts->x_optimize_size,
623 ofast, lang_mask, handlers, loc, dc);
626 /* After all options at LOC have been read into OPTS and OPTS_SET,
627 finalize settings of those options and diagnose incompatible
630 finish_options (struct gcc_options *opts, struct gcc_options *opts_set,
633 enum unwind_info_type ui_except;
635 /* These assertions are because of the use of target hooks that
636 still access global data rather than being passed an options
637 structure pointer. */
638 gcc_assert (opts == &global_options);
639 gcc_assert (opts_set = &global_options_set);
641 if (opts->x_dump_base_name && ! IS_ABSOLUTE_PATH (opts->x_dump_base_name))
643 /* First try to make OPTS->X_DUMP_BASE_NAME relative to the
644 OPTS->X_DUMP_DIR_NAME directory. Then try to make
645 OPTS->X_DUMP_BASE_NAME relative to the OPTS->X_AUX_BASE_NAME
646 directory, typically the directory to contain the object
648 if (opts->x_dump_dir_name)
649 opts->x_dump_base_name = concat (opts->x_dump_dir_name,
650 opts->x_dump_base_name, NULL);
651 else if (opts->x_aux_base_name)
653 const char *aux_base;
655 base_of_path (opts->x_aux_base_name, &aux_base);
656 if (opts->x_aux_base_name != aux_base)
658 int dir_len = aux_base - opts->x_aux_base_name;
659 char *new_dump_base_name =
660 XNEWVEC (char, strlen (opts->x_dump_base_name) + dir_len + 1);
662 /* Copy directory component from OPTS->X_AUX_BASE_NAME. */
663 memcpy (new_dump_base_name, opts->x_aux_base_name, dir_len);
664 /* Append existing OPTS->X_DUMP_BASE_NAME. */
665 strcpy (new_dump_base_name + dir_len, opts->x_dump_base_name);
666 opts->x_dump_base_name = new_dump_base_name;
671 /* Handle related options for unit-at-a-time, toplevel-reorder, and
673 if (!opts->x_flag_unit_at_a_time)
675 if (opts->x_flag_section_anchors && opts_set->x_flag_section_anchors)
676 error_at (loc, "section anchors must be disabled when unit-at-a-time "
678 opts->x_flag_section_anchors = 0;
679 if (opts->x_flag_toplevel_reorder == 1)
680 error_at (loc, "toplevel reorder must be disabled when unit-at-a-time "
682 opts->x_flag_toplevel_reorder = 0;
685 /* -Wmissing-noreturn is alias for -Wsuggest-attribute=noreturn. */
686 if (opts->x_warn_missing_noreturn)
687 opts->x_warn_suggest_attribute_noreturn = true;
689 /* Unless the user has asked for section anchors, we disable toplevel
690 reordering at -O0 to disable transformations that might be surprising
691 to end users and to get -fno-toplevel-reorder tested. */
692 if (!opts->x_optimize
693 && opts->x_flag_toplevel_reorder == 2
694 && !(opts->x_flag_section_anchors && opts_set->x_flag_section_anchors))
696 opts->x_flag_toplevel_reorder = 0;
697 opts->x_flag_section_anchors = 0;
699 if (!opts->x_flag_toplevel_reorder)
701 if (opts->x_flag_section_anchors && opts_set->x_flag_section_anchors)
702 error_at (loc, "section anchors must be disabled when toplevel reorder"
704 opts->x_flag_section_anchors = 0;
707 if (!opts->x_flag_opts_finished)
709 if (opts->x_flag_pie)
710 opts->x_flag_pic = opts->x_flag_pie;
711 if (opts->x_flag_pic && !opts->x_flag_pie)
712 opts->x_flag_shlib = 1;
713 opts->x_flag_opts_finished = false;
716 if (opts->x_optimize == 0)
718 /* Inlining does not work if not optimizing,
719 so force it not to be done. */
720 opts->x_warn_inline = 0;
721 opts->x_flag_no_inline = 1;
724 /* The optimization to partition hot and cold basic blocks into separate
725 sections of the .o and executable files does not work (currently)
726 with exception handling. This is because there is no support for
727 generating unwind info. If opts->x_flag_exceptions is turned on
728 we need to turn off the partitioning optimization. */
730 ui_except = targetm.except_unwind_info ();
732 if (opts->x_flag_exceptions
733 && opts->x_flag_reorder_blocks_and_partition
734 && (ui_except == UI_SJLJ || ui_except == UI_TARGET))
737 "-freorder-blocks-and-partition does not work "
738 "with exceptions on this architecture");
739 opts->x_flag_reorder_blocks_and_partition = 0;
740 opts->x_flag_reorder_blocks = 1;
743 /* If user requested unwind info, then turn off the partitioning
746 if (opts->x_flag_unwind_tables
747 && !targetm.unwind_tables_default
748 && opts->x_flag_reorder_blocks_and_partition
749 && (ui_except == UI_SJLJ || ui_except == UI_TARGET))
752 "-freorder-blocks-and-partition does not support "
753 "unwind info on this architecture");
754 opts->x_flag_reorder_blocks_and_partition = 0;
755 opts->x_flag_reorder_blocks = 1;
758 /* If the target requested unwind info, then turn off the partitioning
759 optimization with a different message. Likewise, if the target does not
760 support named sections. */
762 if (opts->x_flag_reorder_blocks_and_partition
763 && (!targetm.have_named_sections
764 || (opts->x_flag_unwind_tables
765 && targetm.unwind_tables_default
766 && (ui_except == UI_SJLJ || ui_except == UI_TARGET))))
769 "-freorder-blocks-and-partition does not work "
770 "on this architecture");
771 opts->x_flag_reorder_blocks_and_partition = 0;
772 opts->x_flag_reorder_blocks = 1;
775 /* Pipelining of outer loops is only possible when general pipelining
776 capabilities are requested. */
777 if (!opts->x_flag_sel_sched_pipelining)
778 opts->x_flag_sel_sched_pipelining_outer_loops = 0;
780 if (!targetm.ira_cover_classes
781 && opts->x_flag_ira_algorithm == IRA_ALGORITHM_CB)
784 "-fira-algorithm=CB does not work on this architecture");
785 opts->x_flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
788 if (opts->x_flag_conserve_stack)
790 maybe_set_param_value (PARAM_LARGE_STACK_FRAME, 100,
791 opts->x_param_values, opts_set->x_param_values);
792 maybe_set_param_value (PARAM_STACK_FRAME_GROWTH, 40,
793 opts->x_param_values, opts_set->x_param_values);
795 if (opts->x_flag_wpa || opts->x_flag_ltrans)
797 /* These passes are not WHOPR compatible yet. */
798 opts->x_flag_ipa_pta = 0;
799 opts->x_flag_ipa_struct_reorg = 0;
802 if (opts->x_flag_lto)
805 opts->x_flag_generate_lto = 1;
807 /* When generating IL, do not operate in whole-program mode.
808 Otherwise, symbols will be privatized too early, causing link
810 opts->x_flag_whole_program = 0;
812 error_at (loc, "LTO support has not been enabled in this configuration");
815 if ((opts->x_flag_lto_partition_balanced != 0) + (opts->x_flag_lto_partition_1to1 != 0)
816 + (opts->x_flag_lto_partition_none != 0) >= 1)
818 if ((opts->x_flag_lto_partition_balanced != 0)
819 + (opts->x_flag_lto_partition_1to1 != 0)
820 + (opts->x_flag_lto_partition_none != 0) > 1)
821 error_at (loc, "only one -flto-partition value can be specified");
824 /* We initialize opts->x_flag_split_stack to -1 so that targets can set a
825 default value if they choose based on other options. */
826 if (opts->x_flag_split_stack == -1)
827 opts->x_flag_split_stack = 0;
828 else if (opts->x_flag_split_stack)
830 if (!targetm.supports_split_stack (true))
832 error_at (loc, "%<-fsplit-stack%> is not supported by "
833 "this compiler configuration");
834 opts->x_flag_split_stack = 0;
839 #define LEFT_COLUMN 27
841 /* Output ITEM, of length ITEM_WIDTH, in the left column,
842 followed by word-wrapped HELP in a second column. */
844 wrap_help (const char *help,
846 unsigned int item_width,
847 unsigned int columns)
849 unsigned int col_width = LEFT_COLUMN;
850 unsigned int remaining, room, len;
852 remaining = strlen (help);
856 room = columns - 3 - MAX (col_width, item_width);
865 for (i = 0; help[i]; i++)
867 if (i >= room && len != remaining)
871 else if ((help[i] == '-' || help[i] == '/')
872 && help[i + 1] != ' '
873 && i > 0 && ISALPHA (help[i - 1]))
878 printf( " %-*.*s %.*s\n", col_width, item_width, item, len, help);
880 while (help[len] == ' ')
888 /* Print help for a specific front-end, etc. */
890 print_filtered_help (unsigned int include_flags,
891 unsigned int exclude_flags,
892 unsigned int any_flags,
893 unsigned int columns,
894 struct gcc_options *opts)
899 bool displayed = false;
901 if (include_flags == CL_PARAMS)
903 for (i = 0; i < LAST_PARAM; i++)
905 const char *param = compiler_params[i].option;
907 help = compiler_params[i].help;
908 if (help == NULL || *help == '\0')
910 if (exclude_flags & CL_UNDOCUMENTED)
912 help = undocumented_msg;
915 /* Get the translation. */
918 wrap_help (help, param, strlen (param), columns);
924 if (!opts->x_help_printed)
925 opts->x_help_printed = XCNEWVAR (char, cl_options_count);
927 for (i = 0; i < cl_options_count; i++)
930 const struct cl_option *option = cl_options + i;
935 if (include_flags == 0
936 || ((option->flags & include_flags) != include_flags))
938 if ((option->flags & any_flags) == 0)
942 /* Skip unwanted switches. */
943 if ((option->flags & exclude_flags) != 0)
946 /* The driver currently prints its own help text. */
947 if ((option->flags & CL_DRIVER) != 0
948 && (option->flags & (((1U << cl_lang_count) - 1)
949 | CL_COMMON | CL_TARGET)) == 0)
953 /* Skip switches that have already been printed. */
954 if (opts->x_help_printed[i])
957 opts->x_help_printed[i] = true;
962 if (exclude_flags & CL_UNDOCUMENTED)
964 help = undocumented_msg;
967 /* Get the translation. */
970 /* Find the gap between the name of the
971 option and its descriptive text. */
972 tab = strchr (help, '\t');
981 opt = option->opt_text;
985 /* With the -Q option enabled we change the descriptive text associated
986 with an option to be an indication of its current setting. */
989 void *flag_var = option_flag_var (i, opts);
991 if (len < (LEFT_COLUMN + 2))
992 strcpy (new_help, "\t\t");
994 strcpy (new_help, "\t");
997 && option->var_type != CLVC_DEFER)
999 if (option->flags & CL_JOINED)
1001 if (option->var_type == CLVC_STRING)
1003 if (* (const char **) flag_var != NULL)
1004 snprintf (new_help + strlen (new_help),
1005 sizeof (new_help) - strlen (new_help),
1006 * (const char **) flag_var);
1009 sprintf (new_help + strlen (new_help),
1010 "%#x", * (int *) flag_var);
1013 strcat (new_help, option_enabled (i, opts)
1014 ? _("[enabled]") : _("[disabled]"));
1020 wrap_help (help, opt, len, columns);
1026 unsigned int langs = include_flags & CL_LANG_ALL;
1029 printf (_(" No options with the desired characteristics were found\n"));
1034 /* PR 31349: Tell the user how to see all of the
1035 options supported by a specific front end. */
1036 for (i = 0; (1U << i) < CL_LANG_ALL; i ++)
1037 if ((1U << i) & langs)
1038 printf (_(" None found. Use --help=%s to show *all* the options supported by the %s front-end\n"),
1039 lang_names[i], lang_names[i]);
1043 else if (! displayed)
1044 printf (_(" All options with the desired characteristics have already been displayed\n"));
1049 /* Display help for a specified type of option.
1050 The options must have ALL of the INCLUDE_FLAGS set
1051 ANY of the flags in the ANY_FLAGS set
1052 and NONE of the EXCLUDE_FLAGS set. The current option state is in
1055 print_specific_help (unsigned int include_flags,
1056 unsigned int exclude_flags,
1057 unsigned int any_flags,
1058 struct gcc_options *opts)
1060 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1061 const char * description = NULL;
1062 const char * descrip_extra = "";
1066 /* Sanity check: Make sure that we do not have more
1067 languages than we have bits available to enumerate them. */
1068 gcc_assert ((1U << cl_lang_count) < CL_MIN_OPTION_CLASS);
1070 /* If we have not done so already, obtain
1071 the desired maximum width of the output. */
1072 if (opts->x_help_columns == 0)
1076 GET_ENVIRONMENT (p, "COLUMNS");
1079 int value = atoi (p);
1082 opts->x_help_columns = value;
1085 if (opts->x_help_columns == 0)
1086 /* Use a reasonable default. */
1087 opts->x_help_columns = 80;
1090 /* Decide upon the title for the options that we are going to display. */
1091 for (i = 0, flag = 1; flag <= CL_MAX_OPTION_CLASS; flag <<= 1, i ++)
1093 switch (flag & include_flags)
1100 description = _("The following options are target specific");
1103 description = _("The following options control compiler warning messages");
1105 case CL_OPTIMIZATION:
1106 description = _("The following options control optimizations");
1109 description = _("The following options are language-independent");
1112 description = _("The --param option recognizes the following as parameters");
1115 if (i >= cl_lang_count)
1117 if (exclude_flags & all_langs_mask)
1118 description = _("The following options are specific to just the language ");
1120 description = _("The following options are supported by the language ");
1121 descrip_extra = lang_names [i];
1126 if (description == NULL)
1130 if (include_flags & CL_UNDOCUMENTED)
1131 description = _("The following options are not documented");
1132 else if (include_flags & CL_SEPARATE)
1133 description = _("The following options take separate arguments");
1134 else if (include_flags & CL_JOINED)
1135 description = _("The following options take joined arguments");
1138 internal_error ("unrecognized include_flags 0x%x passed to print_specific_help",
1145 if (any_flags & all_langs_mask)
1146 description = _("The following options are language-related");
1148 description = _("The following options are language-independent");
1152 printf ("%s%s:\n", description, descrip_extra);
1153 print_filtered_help (include_flags, exclude_flags, any_flags,
1154 opts->x_help_columns, opts);
1157 /* Handle target- and language-independent options. Return zero to
1158 generate an "unknown option" message. Only options that need
1159 extra handling need to be listed here; if you simply want
1160 DECODED->value assigned to a variable, it happens automatically. */
1163 common_handle_option (struct gcc_options *opts,
1164 struct gcc_options *opts_set,
1165 const struct cl_decoded_option *decoded,
1166 unsigned int lang_mask, int kind ATTRIBUTE_UNUSED,
1168 const struct cl_option_handlers *handlers,
1169 diagnostic_context *dc)
1171 size_t scode = decoded->opt_index;
1172 const char *arg = decoded->arg;
1173 int value = decoded->value;
1174 enum opt_code code = (enum opt_code) scode;
1176 gcc_assert (opts == &global_options);
1177 gcc_assert (opts_set == &global_options_set);
1178 gcc_assert (dc == global_dc);
1179 gcc_assert (decoded->canonical_option_num_elements <= 2);
1184 handle_param (opts, opts_set, loc, arg);
1189 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1190 unsigned int undoc_mask;
1193 undoc_mask = ((opts->x_verbose_flag | opts->x_extra_warnings)
1196 /* First display any single language specific options. */
1197 for (i = 0; i < cl_lang_count; i++)
1199 (1U << i, (all_langs_mask & (~ (1U << i))) | undoc_mask, 0, opts);
1200 /* Next display any multi language specific options. */
1201 print_specific_help (0, undoc_mask, all_langs_mask, opts);
1202 /* Then display any remaining, non-language options. */
1203 for (i = CL_MIN_OPTION_CLASS; i <= CL_MAX_OPTION_CLASS; i <<= 1)
1205 print_specific_help (i, undoc_mask, 0, opts);
1206 opts->x_exit_after_options = true;
1210 case OPT__target_help:
1211 print_specific_help (CL_TARGET, CL_UNDOCUMENTED, 0, opts);
1212 opts->x_exit_after_options = true;
1214 /* Allow the target a chance to give the user some additional information. */
1221 const char * a = arg;
1222 unsigned int include_flags = 0;
1223 /* Note - by default we include undocumented options when listing
1224 specific classes. If you only want to see documented options
1225 then add ",^undocumented" to the --help= option. E.g.:
1227 --help=target,^undocumented */
1228 unsigned int exclude_flags = 0;
1230 /* Walk along the argument string, parsing each word in turn.
1232 arg = [^]{word}[,{arg}]
1233 word = {optimizers|target|warnings|undocumented|
1234 params|common|<language>} */
1239 const char * string;
1244 { "optimizers", CL_OPTIMIZATION },
1245 { "target", CL_TARGET },
1246 { "warnings", CL_WARNING },
1247 { "undocumented", CL_UNDOCUMENTED },
1248 { "params", CL_PARAMS },
1249 { "joined", CL_JOINED },
1250 { "separate", CL_SEPARATE },
1251 { "common", CL_COMMON },
1254 unsigned int * pflags;
1256 unsigned int lang_flag, specific_flag;
1263 pflags = & exclude_flags;
1266 pflags = & include_flags;
1268 comma = strchr (a, ',');
1279 /* Check to see if the string matches an option class name. */
1280 for (i = 0, specific_flag = 0; specifics[i].string != NULL; i++)
1281 if (strncasecmp (a, specifics[i].string, len) == 0)
1283 specific_flag = specifics[i].flag;
1287 /* Check to see if the string matches a language name.
1288 Note - we rely upon the alpha-sorted nature of the entries in
1289 the lang_names array, specifically that shorter names appear
1290 before their longer variants. (i.e. C before C++). That way
1291 when we are attempting to match --help=c for example we will
1292 match with C first and not C++. */
1293 for (i = 0, lang_flag = 0; i < cl_lang_count; i++)
1294 if (strncasecmp (a, lang_names[i], len) == 0)
1296 lang_flag = 1U << i;
1300 if (specific_flag != 0)
1303 * pflags |= specific_flag;
1306 /* The option's argument matches both the start of a
1307 language name and the start of an option class name.
1308 We have a special case for when the user has
1309 specified "--help=c", but otherwise we have to issue
1311 if (strncasecmp (a, "c", len) == 0)
1312 * pflags |= lang_flag;
1315 "--help argument %q.*s is ambiguous, "
1316 "please be more specific",
1320 else if (lang_flag != 0)
1321 * pflags |= lang_flag;
1324 "unrecognized argument to --help= option: %q.*s",
1333 print_specific_help (include_flags, exclude_flags, 0, opts);
1334 opts->x_exit_after_options = true;
1339 opts->x_exit_after_options = true;
1345 /* Currently handled in a prescan. */
1349 enable_warning_as_error (arg, value, lang_mask, handlers,
1350 opts, opts_set, loc, dc);
1353 case OPT_Wlarger_than_:
1354 opts->x_larger_than_size = value;
1355 opts->x_warn_larger_than = value != -1;
1358 case OPT_Wfatal_errors:
1359 dc->fatal_errors = value;
1362 case OPT_Wframe_larger_than_:
1363 opts->x_frame_larger_than_size = value;
1364 opts->x_warn_frame_larger_than = value != -1;
1367 case OPT_Wstrict_aliasing:
1368 set_Wstrict_aliasing (opts, value);
1371 case OPT_Wstrict_overflow:
1372 opts->x_warn_strict_overflow = (value
1373 ? (int) WARN_STRICT_OVERFLOW_CONDITIONAL
1377 case OPT_Wsystem_headers:
1378 dc->dc_warn_system_headers = value;
1382 opts->x_flag_gen_aux_info = 1;
1385 case OPT_auxbase_strip:
1387 char *tmp = xstrdup (arg);
1388 strip_off_ending (tmp, strlen (tmp));
1390 opts->x_aux_base_name = tmp;
1395 decode_d_option (arg, opts, loc, dc);
1398 case OPT_fcall_used_:
1399 case OPT_fcall_saved_:
1403 case OPT_fcompare_debug_second:
1404 flag_compare_debug = value;
1408 case OPT_fdbg_cnt_list:
1412 case OPT_fdebug_prefix_map_:
1416 case OPT_fdiagnostics_show_location_:
1417 if (!strcmp (arg, "once"))
1418 diagnostic_prefixing_rule (dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
1419 else if (!strcmp (arg, "every-line"))
1420 diagnostic_prefixing_rule (dc)
1421 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
1426 case OPT_fdiagnostics_show_option:
1427 dc->show_option_requested = value;
1434 case OPT_ffp_contract_:
1435 if (!strcmp (arg, "on"))
1436 /* Not implemented, fall back to conservative FP_CONTRACT_OFF. */
1437 opts->x_flag_fp_contract_mode = FP_CONTRACT_OFF;
1438 else if (!strcmp (arg, "off"))
1439 opts->x_flag_fp_contract_mode = FP_CONTRACT_OFF;
1440 else if (!strcmp (arg, "fast"))
1441 opts->x_flag_fp_contract_mode = FP_CONTRACT_FAST;
1443 error_at (loc, "unknown floating point contraction style \"%s\"", arg);
1446 case OPT_fexcess_precision_:
1447 if (!strcmp (arg, "fast"))
1448 opts->x_flag_excess_precision_cmdline = EXCESS_PRECISION_FAST;
1449 else if (!strcmp (arg, "standard"))
1450 opts->x_flag_excess_precision_cmdline = EXCESS_PRECISION_STANDARD;
1452 error_at (loc, "unknown excess precision style \"%s\"", arg);
1455 case OPT_ffast_math:
1456 set_fast_math_flags (opts, value);
1459 case OPT_funsafe_math_optimizations:
1460 set_unsafe_math_optimizations_flags (opts, value);
1467 case OPT_finline_limit_:
1468 set_param_value ("max-inline-insns-single", value / 2,
1469 opts->x_param_values, opts_set->x_param_values);
1470 set_param_value ("max-inline-insns-auto", value / 2,
1471 opts->x_param_values, opts_set->x_param_values);
1474 case OPT_finstrument_functions_exclude_function_list_:
1475 add_comma_separated_to_vector
1476 (&opts->x_flag_instrument_functions_exclude_functions, arg);
1479 case OPT_finstrument_functions_exclude_file_list_:
1480 add_comma_separated_to_vector
1481 (&opts->x_flag_instrument_functions_exclude_files, arg);
1484 case OPT_fmessage_length_:
1485 pp_set_line_maximum_length (dc->printer, value);
1488 case OPT_fpack_struct_:
1489 if (value <= 0 || (value & (value - 1)) || value > 16)
1491 "structure alignment must be a small power of two, not %d",
1494 opts->x_initial_max_fld_align = value;
1498 case OPT_fplugin_arg_:
1502 case OPT_fprofile_use_:
1503 opts->x_profile_data_prefix = xstrdup (arg);
1504 opts->x_flag_profile_use = true;
1506 /* No break here - do -fprofile-use processing. */
1507 case OPT_fprofile_use:
1508 if (!opts_set->x_flag_branch_probabilities)
1509 opts->x_flag_branch_probabilities = value;
1510 if (!opts_set->x_flag_profile_values)
1511 opts->x_flag_profile_values = value;
1512 if (!opts_set->x_flag_unroll_loops)
1513 opts->x_flag_unroll_loops = value;
1514 if (!opts_set->x_flag_peel_loops)
1515 opts->x_flag_peel_loops = value;
1516 if (!opts_set->x_flag_tracer)
1517 opts->x_flag_tracer = value;
1518 if (!opts_set->x_flag_value_profile_transformations)
1519 opts->x_flag_value_profile_transformations = value;
1520 if (!opts_set->x_flag_inline_functions)
1521 opts->x_flag_inline_functions = value;
1522 if (!opts_set->x_flag_ipa_cp)
1523 opts->x_flag_ipa_cp = value;
1524 if (!opts_set->x_flag_ipa_cp_clone
1525 && value && opts->x_flag_ipa_cp)
1526 opts->x_flag_ipa_cp_clone = value;
1527 if (!opts_set->x_flag_predictive_commoning)
1528 opts->x_flag_predictive_commoning = value;
1529 if (!opts_set->x_flag_unswitch_loops)
1530 opts->x_flag_unswitch_loops = value;
1531 if (!opts_set->x_flag_gcse_after_reload)
1532 opts->x_flag_gcse_after_reload = value;
1535 case OPT_fprofile_generate_:
1536 opts->x_profile_data_prefix = xstrdup (arg);
1538 /* No break here - do -fprofile-generate processing. */
1539 case OPT_fprofile_generate:
1540 if (!opts_set->x_profile_arc_flag)
1541 opts->x_profile_arc_flag = value;
1542 if (!opts_set->x_flag_profile_values)
1543 opts->x_flag_profile_values = value;
1544 if (!opts_set->x_flag_value_profile_transformations)
1545 opts->x_flag_value_profile_transformations = value;
1546 if (!opts_set->x_flag_inline_functions)
1547 opts->x_flag_inline_functions = value;
1550 case OPT_fshow_column:
1551 dc->show_column = value;
1554 case OPT_fvisibility_:
1556 if (!strcmp(arg, "default"))
1557 opts->x_default_visibility = VISIBILITY_DEFAULT;
1558 else if (!strcmp(arg, "internal"))
1559 opts->x_default_visibility = VISIBILITY_INTERNAL;
1560 else if (!strcmp(arg, "hidden"))
1561 opts->x_default_visibility = VISIBILITY_HIDDEN;
1562 else if (!strcmp(arg, "protected"))
1563 opts->x_default_visibility = VISIBILITY_PROTECTED;
1565 error_at (loc, "unrecognized visibility value \"%s\"", arg);
1569 case OPT_frandom_seed:
1570 /* The real switch is -fno-random-seed. */
1576 case OPT_frandom_seed_:
1580 case OPT_fsched_verbose_:
1581 #ifdef INSN_SCHEDULING
1582 /* Handled with Var in common.opt. */
1588 case OPT_fsched_stalled_insns_:
1589 opts->x_flag_sched_stalled_insns = value;
1590 if (opts->x_flag_sched_stalled_insns == 0)
1591 opts->x_flag_sched_stalled_insns = -1;
1594 case OPT_fsched_stalled_insns_dep_:
1595 opts->x_flag_sched_stalled_insns_dep = value;
1598 case OPT_fstack_check_:
1599 if (!strcmp (arg, "no"))
1600 flag_stack_check = NO_STACK_CHECK;
1601 else if (!strcmp (arg, "generic"))
1602 /* This is the old stack checking method. */
1603 flag_stack_check = STACK_CHECK_BUILTIN
1604 ? FULL_BUILTIN_STACK_CHECK
1605 : GENERIC_STACK_CHECK;
1606 else if (!strcmp (arg, "specific"))
1607 /* This is the new stack checking method. */
1608 flag_stack_check = STACK_CHECK_BUILTIN
1609 ? FULL_BUILTIN_STACK_CHECK
1610 : STACK_CHECK_STATIC_BUILTIN
1611 ? STATIC_BUILTIN_STACK_CHECK
1612 : GENERIC_STACK_CHECK;
1614 warning_at (loc, 0, "unknown stack check parameter \"%s\"", arg);
1617 case OPT_fstack_limit:
1618 /* The real switch is -fno-stack-limit. */
1624 case OPT_fstack_limit_register_:
1625 case OPT_fstack_limit_symbol_:
1629 case OPT_ftree_vectorizer_verbose_:
1630 vect_set_verbosity_level (opts, value);
1633 case OPT_ftls_model_:
1634 if (!strcmp (arg, "global-dynamic"))
1635 opts->x_flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
1636 else if (!strcmp (arg, "local-dynamic"))
1637 opts->x_flag_tls_default = TLS_MODEL_LOCAL_DYNAMIC;
1638 else if (!strcmp (arg, "initial-exec"))
1639 opts->x_flag_tls_default = TLS_MODEL_INITIAL_EXEC;
1640 else if (!strcmp (arg, "local-exec"))
1641 opts->x_flag_tls_default = TLS_MODEL_LOCAL_EXEC;
1643 warning_at (loc, 0, "unknown tls-model \"%s\"", arg);
1646 case OPT_fira_algorithm_:
1647 if (!strcmp (arg, "CB"))
1648 opts->x_flag_ira_algorithm = IRA_ALGORITHM_CB;
1649 else if (!strcmp (arg, "priority"))
1650 opts->x_flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
1652 warning_at (loc, 0, "unknown ira algorithm \"%s\"", arg);
1655 case OPT_fira_region_:
1656 if (!strcmp (arg, "one"))
1657 opts->x_flag_ira_region = IRA_REGION_ONE;
1658 else if (!strcmp (arg, "all"))
1659 opts->x_flag_ira_region = IRA_REGION_ALL;
1660 else if (!strcmp (arg, "mixed"))
1661 opts->x_flag_ira_region = IRA_REGION_MIXED;
1663 warning_at (loc, 0, "unknown ira region \"%s\"", arg);
1667 set_debug_level (NO_DEBUG, DEFAULT_GDB_EXTENSIONS, arg, opts, opts_set,
1672 set_debug_level (SDB_DEBUG, false, arg, opts, opts_set, loc);
1676 if (value < 2 || value > 4)
1677 error_at (loc, "dwarf version %d is not supported", value);
1679 dwarf_version = value;
1680 set_debug_level (DWARF2_DEBUG, false, "", opts, opts_set, loc);
1684 set_debug_level (NO_DEBUG, 2, arg, opts, opts_set, loc);
1689 set_debug_level (DBX_DEBUG, code == OPT_gstabs_, arg, opts, opts_set,
1694 set_debug_level (VMS_DEBUG, false, arg, opts, opts_set, loc);
1699 set_debug_level (XCOFF_DEBUG, code == OPT_gxcoff_, arg, opts, opts_set,
1703 case OPT_pedantic_errors:
1704 opts->x_pedantic = 1;
1705 dc->pedantic_errors = 1;
1709 opts->x_flag_lto = "";
1713 dc->dc_inhibit_warnings = true;
1716 case OPT_fmax_errors_:
1717 dc->max_errors = value;
1720 case OPT_fuse_linker_plugin:
1721 /* No-op. Used by the driver and passed to us because it starts with f.*/
1725 /* If the flag was handled in a standard way, assume the lack of
1726 processing here is intentional. */
1727 gcc_assert (option_flag_var (scode, opts));
1734 /* Handle --param NAME=VALUE. */
1736 handle_param (struct gcc_options *opts, struct gcc_options *opts_set,
1737 location_t loc, const char *carg)
1742 arg = xstrdup (carg);
1743 equal = strchr (arg, '=');
1745 error_at (loc, "%s: --param arguments should be of the form NAME=VALUE",
1749 value = integral_argument (equal + 1);
1751 error_at (loc, "invalid --param value %qs", equal + 1);
1755 set_param_value (arg, value,
1756 opts->x_param_values, opts_set->x_param_values);
1763 /* Used to set the level of strict aliasing warnings in OPTS,
1764 when no level is specified (i.e., when -Wstrict-aliasing, and not
1765 -Wstrict-aliasing=level was given).
1766 ONOFF is assumed to take value 1 when -Wstrict-aliasing is specified,
1767 and 0 otherwise. After calling this function, wstrict_aliasing will be
1768 set to the default value of -Wstrict_aliasing=level, currently 3. */
1770 set_Wstrict_aliasing (struct gcc_options *opts, int onoff)
1772 gcc_assert (onoff == 0 || onoff == 1);
1774 opts->x_warn_strict_aliasing = 3;
1776 opts->x_warn_strict_aliasing = 0;
1779 /* The following routines are useful in setting all the flags that
1780 -ffast-math and -fno-fast-math imply. */
1782 set_fast_math_flags (struct gcc_options *opts, int set)
1784 opts->x_flag_unsafe_math_optimizations = set;
1785 set_unsafe_math_optimizations_flags (opts, set);
1786 opts->x_flag_finite_math_only = set;
1787 opts->x_flag_errno_math = !set;
1790 opts->x_flag_signaling_nans = 0;
1791 opts->x_flag_rounding_math = 0;
1792 opts->x_flag_cx_limited_range = 1;
1796 /* When -funsafe-math-optimizations is set the following
1797 flags are set as well. */
1799 set_unsafe_math_optimizations_flags (struct gcc_options *opts, int set)
1801 opts->x_flag_trapping_math = !set;
1802 opts->x_flag_signed_zeros = !set;
1803 opts->x_flag_associative_math = set;
1804 opts->x_flag_reciprocal_math = set;
1807 /* Return true iff flags in OPTS are set as if -ffast-math. */
1809 fast_math_flags_set_p (const struct gcc_options *opts)
1811 return (!opts->x_flag_trapping_math
1812 && opts->x_flag_unsafe_math_optimizations
1813 && opts->x_flag_finite_math_only
1814 && !opts->x_flag_signed_zeros
1815 && !opts->x_flag_errno_math);
1818 /* Return true iff flags are set as if -ffast-math but using the flags stored
1819 in the struct cl_optimization structure. */
1821 fast_math_flags_struct_set_p (struct cl_optimization *opt)
1823 return (!opt->x_flag_trapping_math
1824 && opt->x_flag_unsafe_math_optimizations
1825 && opt->x_flag_finite_math_only
1826 && !opt->x_flag_signed_zeros
1827 && !opt->x_flag_errno_math);
1830 /* Handle a debug output -g switch for options OPTS
1831 (OPTS_SET->x_write_symbols storing whether a debug type was passed
1832 explicitly), location LOC. EXTENDED is true or false to support
1833 extended output (2 is special and means "-ggdb" was given). */
1835 set_debug_level (enum debug_info_type type, int extended, const char *arg,
1836 struct gcc_options *opts, struct gcc_options *opts_set,
1839 opts->x_use_gnu_debug_info_extensions = extended;
1841 if (type == NO_DEBUG)
1843 if (opts->x_write_symbols == NO_DEBUG)
1845 opts->x_write_symbols = PREFERRED_DEBUGGING_TYPE;
1849 #ifdef DWARF2_DEBUGGING_INFO
1850 opts->x_write_symbols = DWARF2_DEBUG;
1851 #elif defined DBX_DEBUGGING_INFO
1852 opts->x_write_symbols = DBX_DEBUG;
1856 if (opts->x_write_symbols == NO_DEBUG)
1857 warning_at (loc, 0, "target system does not support debug output");
1862 /* Does it conflict with an already selected type? */
1863 if (opts_set->x_write_symbols != NO_DEBUG
1864 && opts->x_write_symbols != NO_DEBUG
1865 && type != opts->x_write_symbols)
1866 error_at (loc, "debug format \"%s\" conflicts with prior selection",
1867 debug_type_names[type]);
1868 opts->x_write_symbols = type;
1869 opts_set->x_write_symbols = type;
1872 /* A debug flag without a level defaults to level 2. */
1875 if (!opts->x_debug_info_level)
1876 opts->x_debug_info_level = DINFO_LEVEL_NORMAL;
1880 int argval = integral_argument (arg);
1882 error_at (loc, "unrecognised debug output level \"%s\"", arg);
1883 else if (argval > 3)
1884 error_at (loc, "debug output level %s is too high", arg);
1886 opts->x_debug_info_level = (enum debug_info_levels) argval;
1890 /* Arrange to dump core on error for diagnostic context DC. (The
1891 regular error message is still printed first, except in the case of
1895 setup_core_dumping (diagnostic_context *dc)
1898 signal (SIGABRT, SIG_DFL);
1900 #if defined(HAVE_SETRLIMIT)
1903 if (getrlimit (RLIMIT_CORE, &rlim) != 0)
1904 fatal_error ("getting core file size maximum limit: %m");
1905 rlim.rlim_cur = rlim.rlim_max;
1906 if (setrlimit (RLIMIT_CORE, &rlim) != 0)
1907 fatal_error ("setting core file size limit to maximum: %m");
1910 diagnostic_abort_on_error (dc);
1913 /* Parse a -d<ARG> command line switch for OPTS, location LOC,
1914 diagnostic context DC. */
1917 decode_d_option (const char *arg, struct gcc_options *opts,
1918 location_t loc, diagnostic_context *dc)
1926 opts->x_flag_debug_asm = 1;
1929 opts->x_flag_print_asm_name = 1;
1932 opts->x_flag_dump_rtl_in_asm = 1;
1933 opts->x_flag_print_asm_name = 1;
1936 opts->x_graph_dump_format = vcg;
1939 opts->x_rtl_dump_and_exit = 1;
1941 case 'D': /* These are handled by the preprocessor. */
1948 setup_core_dumping (dc);
1951 opts->x_flag_dump_all_passed = true;
1955 warning_at (loc, 0, "unrecognized gcc debugging option: %c", c);
1960 /* Enable (or disable if VALUE is 0) a warning option ARG (language
1961 mask LANG_MASK, option handlers HANDLERS) as an error for option
1962 structures OPTS and OPTS_SET, diagnostic context DC (possibly
1963 NULL), location LOC. This is used by -Werror=. */
1966 enable_warning_as_error (const char *arg, int value, unsigned int lang_mask,
1967 const struct cl_option_handlers *handlers,
1968 struct gcc_options *opts,
1969 struct gcc_options *opts_set,
1970 location_t loc, diagnostic_context *dc)
1975 new_option = XNEWVEC (char, strlen (arg) + 2);
1976 new_option[0] = 'W';
1977 strcpy (new_option + 1, arg);
1978 option_index = find_opt (new_option, lang_mask);
1979 if (option_index == OPT_SPECIAL_unknown)
1981 error_at (loc, "-Werror=%s: no option -%s", arg, new_option);
1985 const diagnostic_t kind = value ? DK_ERROR : DK_WARNING;
1987 control_warning_option (option_index, (int) kind, value,
1989 handlers, opts, opts_set, dc);
1994 /* Return malloced memory for the name of the option OPTION_INDEX
1995 which enabled a diagnostic (context CONTEXT), originally of type
1996 ORIG_DIAG_KIND but possibly converted to DIAG_KIND by options such
2000 option_name (diagnostic_context *context, int option_index,
2001 diagnostic_t orig_diag_kind, diagnostic_t diag_kind)
2005 /* A warning classified as an error. */
2006 if ((orig_diag_kind == DK_WARNING || orig_diag_kind == DK_PEDWARN)
2007 && diag_kind == DK_ERROR)
2008 return concat (cl_options[OPT_Werror_].opt_text,
2009 /* Skip over "-W". */
2010 cl_options[option_index].opt_text + 2,
2012 /* A warning with option. */
2014 return xstrdup (cl_options[option_index].opt_text);
2016 /* A warning without option classified as an error. */
2017 else if (orig_diag_kind == DK_WARNING || orig_diag_kind == DK_PEDWARN
2018 || diag_kind == DK_WARNING)
2020 if (context->warning_as_error_requested)
2021 return xstrdup (cl_options[OPT_Werror].opt_text);
2023 return xstrdup (_("enabled by default"));